Commit | Line | Data |
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059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
f9ba5e22 | 5 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
059ec3d9 PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | /* Functions for handling an incoming SMTP call. */ | |
9 | ||
10 | ||
11 | #include "exim.h" | |
2ef7ed08 | 12 | #include <assert.h> |
059ec3d9 PH |
13 | |
14 | ||
15 | /* Initialize for TCP wrappers if so configured. It appears that the macro | |
16 | HAVE_IPV6 is used in some versions of the tcpd.h header, so we unset it before | |
17 | including that header, and restore its value afterwards. */ | |
18 | ||
19 | #ifdef USE_TCP_WRAPPERS | |
20 | ||
21 | #if HAVE_IPV6 | |
22 | #define EXIM_HAVE_IPV6 | |
23 | #endif | |
24 | #undef HAVE_IPV6 | |
25 | #include <tcpd.h> | |
26 | #undef HAVE_IPV6 | |
27 | #ifdef EXIM_HAVE_IPV6 | |
28 | #define HAVE_IPV6 TRUE | |
29 | #endif | |
30 | ||
31 | int allow_severity = LOG_INFO; | |
32 | int deny_severity = LOG_NOTICE; | |
5dc43717 | 33 | uschar *tcp_wrappers_name; |
059ec3d9 PH |
34 | #endif |
35 | ||
36 | ||
8d67ada3 PH |
37 | /* Size of buffer for reading SMTP commands. We used to use 512, as defined |
38 | by RFC 821. However, RFC 1869 specifies that this must be increased for SMTP | |
39 | commands that accept arguments, and this in particular applies to AUTH, where | |
94431adb | 40 | the data can be quite long. More recently this value was 2048 in Exim; |
e2ca7082 | 41 | however, RFC 4954 (circa 2007) recommends 12288 bytes to handle AUTH. Clients |
94431adb HSHR |
42 | such as Thunderbird will send an AUTH with an initial-response for GSSAPI. |
43 | The maximum size of a Kerberos ticket under Windows 2003 is 12000 bytes, and | |
e2ca7082 PP |
44 | we need room to handle large base64-encoded AUTHs for GSSAPI. |
45 | */ | |
46 | ||
bd8fbe36 | 47 | #define SMTP_CMD_BUFFER_SIZE 16384 |
059ec3d9 PH |
48 | |
49 | /* Size of buffer for reading SMTP incoming packets */ | |
50 | ||
bd8fbe36 | 51 | #define IN_BUFFER_SIZE 8192 |
059ec3d9 PH |
52 | |
53 | /* Structure for SMTP command list */ | |
54 | ||
55 | typedef struct { | |
1ba28e2b | 56 | const char *name; |
059ec3d9 PH |
57 | int len; |
58 | short int cmd; | |
59 | short int has_arg; | |
60 | short int is_mail_cmd; | |
61 | } smtp_cmd_list; | |
62 | ||
63 | /* Codes for identifying commands. We order them so that those that come first | |
64 | are those for which synchronization is always required. Checking this can help | |
65 | block some spam. */ | |
66 | ||
67 | enum { | |
68 | /* These commands are required to be synchronized, i.e. to be the last in a | |
69 | block of commands when pipelining. */ | |
70 | ||
71 | HELO_CMD, EHLO_CMD, DATA_CMD, /* These are listed in the pipelining */ | |
72 | VRFY_CMD, EXPN_CMD, NOOP_CMD, /* RFC as requiring synchronization */ | |
73 | ETRN_CMD, /* This by analogy with TURN from the RFC */ | |
74 | STARTTLS_CMD, /* Required by the STARTTLS RFC */ | |
b3ef41c9 | 75 | TLS_AUTH_CMD, /* auto-command at start of SSL */ |
059ec3d9 PH |
76 | |
77 | /* This is a dummy to identify the non-sync commands when pipelining */ | |
78 | ||
79 | NON_SYNC_CMD_PIPELINING, | |
80 | ||
81 | /* These commands need not be synchronized when pipelining */ | |
82 | ||
83 | MAIL_CMD, RCPT_CMD, RSET_CMD, | |
84 | ||
f4630439 JH |
85 | /* This is a dummy to identify the non-sync commands when not pipelining */ |
86 | ||
87 | NON_SYNC_CMD_NON_PIPELINING, | |
88 | ||
6d5c916c JH |
89 | /* RFC3030 section 2: "After all MAIL and RCPT responses are collected and |
90 | processed the message is sent using a series of BDAT commands" | |
91 | implies that BDAT should be synchronized. However, we see Google, at least, | |
92 | sending MAIL,RCPT,BDAT-LAST in a single packet, clearly not waiting for | |
f4630439 JH |
93 | processing of the RCPT response(s). We shall do the same, and not require |
94 | synch for BDAT. Worse, as the chunk may (very likely will) follow the | |
95 | command-header in the same packet we cannot do the usual "is there any | |
4c04137d | 96 | follow-on data after the command line" even for non-pipeline mode. |
f4630439 | 97 | So we'll need an explicit check after reading the expected chunk amount |
4c04137d | 98 | when non-pipe, before sending the ACK. */ |
6d5c916c JH |
99 | |
100 | BDAT_CMD, | |
101 | ||
059ec3d9 PH |
102 | /* I have been unable to find a statement about the use of pipelining |
103 | with AUTH, so to be on the safe side it is here, though I kind of feel | |
104 | it should be up there with the synchronized commands. */ | |
105 | ||
106 | AUTH_CMD, | |
107 | ||
108 | /* I'm not sure about these, but I don't think they matter. */ | |
109 | ||
110 | QUIT_CMD, HELP_CMD, | |
111 | ||
cee5f132 | 112 | #ifdef SUPPORT_PROXY |
a3c86431 TL |
113 | PROXY_FAIL_IGNORE_CMD, |
114 | #endif | |
115 | ||
059ec3d9 PH |
116 | /* These are specials that don't correspond to actual commands */ |
117 | ||
118 | EOF_CMD, OTHER_CMD, BADARG_CMD, BADCHAR_CMD, BADSYN_CMD, | |
119 | TOO_MANY_NONMAIL_CMD }; | |
120 | ||
121 | ||
b4ed4da0 PH |
122 | /* This is a convenience macro for adding the identity of an SMTP command |
123 | to the circular buffer that holds a list of the last n received. */ | |
124 | ||
125 | #define HAD(n) \ | |
126 | smtp_connection_had[smtp_ch_index++] = n; \ | |
127 | if (smtp_ch_index >= SMTP_HBUFF_SIZE) smtp_ch_index = 0 | |
128 | ||
059ec3d9 PH |
129 | |
130 | /************************************************* | |
131 | * Local static variables * | |
132 | *************************************************/ | |
133 | ||
88752192 JH |
134 | static struct { |
135 | BOOL auth_advertised :1; | |
059ec3d9 | 136 | #ifdef SUPPORT_TLS |
88752192 | 137 | BOOL tls_advertised :1; |
8ac90765 | 138 | # ifdef EXPERIMENTAL_REQUIRETLS |
88752192 | 139 | BOOL requiretls_advertised :1; |
8ac90765 | 140 | # endif |
059ec3d9 | 141 | #endif |
88752192 JH |
142 | BOOL dsn_advertised :1; |
143 | BOOL esmtp :1; | |
144 | BOOL helo_required :1; | |
145 | BOOL helo_verify :1; | |
146 | BOOL helo_seen :1; | |
147 | BOOL helo_accept_junk :1; | |
148 | BOOL rcpt_smtp_response_same :1; | |
149 | BOOL rcpt_in_progress :1; | |
150 | BOOL smtp_exit_function_called :1; | |
8c5d388a | 151 | #ifdef SUPPORT_I18N |
88752192 | 152 | BOOL smtputf8_advertised :1; |
d1a13eea | 153 | #endif |
88752192 JH |
154 | } fl = { |
155 | .helo_required = FALSE, | |
156 | .helo_verify = FALSE, | |
157 | .smtp_exit_function_called = FALSE, | |
158 | }; | |
159 | ||
160 | static auth_instance *authenticated_by; | |
161 | static int count_nonmail; | |
162 | static int nonmail_command_count; | |
059ec3d9 PH |
163 | static int synprot_error_count; |
164 | static int unknown_command_count; | |
165 | static int sync_cmd_limit; | |
166 | static int smtp_write_error = 0; | |
167 | ||
2679d413 | 168 | static uschar *rcpt_smtp_response; |
ca86f471 PH |
169 | static uschar *smtp_data_buffer; |
170 | static uschar *smtp_cmd_data; | |
171 | ||
059ec3d9 PH |
172 | /* We need to know the position of RSET, HELO, EHLO, AUTH, and STARTTLS. Their |
173 | final fields of all except AUTH are forced TRUE at the start of a new message | |
174 | setup, to allow one of each between messages that is not counted as a nonmail | |
175 | command. (In fact, only one of HELO/EHLO is not counted.) Also, we have to | |
176 | allow a new EHLO after starting up TLS. | |
177 | ||
178 | AUTH is "falsely" labelled as a mail command initially, so that it doesn't get | |
179 | counted. However, the flag is changed when AUTH is received, so that multiple | |
180 | failing AUTHs will eventually hit the limit. After a successful AUTH, another | |
181 | AUTH is already forbidden. After a TLS session is started, AUTH's flag is again | |
182 | forced TRUE, to allow for the re-authentication that can happen at that point. | |
183 | ||
184 | QUIT is also "falsely" labelled as a mail command so that it doesn't up the | |
2f460950 JH |
185 | count of non-mail commands and possibly provoke an error. |
186 | ||
187 | tls_auth is a pseudo-command, never expected in input. It is activated | |
188 | on TLS startup and looks for a tls authenticator. */ | |
059ec3d9 PH |
189 | |
190 | static smtp_cmd_list cmd_list[] = { | |
d1a13eea JH |
191 | /* name len cmd has_arg is_mail_cmd */ |
192 | ||
059ec3d9 PH |
193 | { "rset", sizeof("rset")-1, RSET_CMD, FALSE, FALSE }, /* First */ |
194 | { "helo", sizeof("helo")-1, HELO_CMD, TRUE, FALSE }, | |
195 | { "ehlo", sizeof("ehlo")-1, EHLO_CMD, TRUE, FALSE }, | |
196 | { "auth", sizeof("auth")-1, AUTH_CMD, TRUE, TRUE }, | |
e0574cb5 | 197 | #ifdef SUPPORT_TLS |
059ec3d9 | 198 | { "starttls", sizeof("starttls")-1, STARTTLS_CMD, FALSE, FALSE }, |
69d8eed7 | 199 | { "tls_auth", 0, TLS_AUTH_CMD, FALSE, FALSE }, |
e0574cb5 | 200 | #endif |
059ec3d9 PH |
201 | |
202 | /* If you change anything above here, also fix the definitions below. */ | |
203 | ||
204 | { "mail from:", sizeof("mail from:")-1, MAIL_CMD, TRUE, TRUE }, | |
205 | { "rcpt to:", sizeof("rcpt to:")-1, RCPT_CMD, TRUE, TRUE }, | |
206 | { "data", sizeof("data")-1, DATA_CMD, FALSE, TRUE }, | |
18481de3 | 207 | { "bdat", sizeof("bdat")-1, BDAT_CMD, TRUE, TRUE }, |
059ec3d9 PH |
208 | { "quit", sizeof("quit")-1, QUIT_CMD, FALSE, TRUE }, |
209 | { "noop", sizeof("noop")-1, NOOP_CMD, TRUE, FALSE }, | |
210 | { "etrn", sizeof("etrn")-1, ETRN_CMD, TRUE, FALSE }, | |
211 | { "vrfy", sizeof("vrfy")-1, VRFY_CMD, TRUE, FALSE }, | |
212 | { "expn", sizeof("expn")-1, EXPN_CMD, TRUE, FALSE }, | |
213 | { "help", sizeof("help")-1, HELP_CMD, TRUE, FALSE } | |
214 | }; | |
215 | ||
216 | static smtp_cmd_list *cmd_list_end = | |
217 | cmd_list + sizeof(cmd_list)/sizeof(smtp_cmd_list); | |
218 | ||
219 | #define CMD_LIST_RSET 0 | |
220 | #define CMD_LIST_HELO 1 | |
221 | #define CMD_LIST_EHLO 2 | |
222 | #define CMD_LIST_AUTH 3 | |
223 | #define CMD_LIST_STARTTLS 4 | |
b3ef41c9 | 224 | #define CMD_LIST_TLS_AUTH 5 |
059ec3d9 | 225 | |
b4ed4da0 PH |
226 | /* This list of names is used for performing the smtp_no_mail logging action. |
227 | It must be kept in step with the SCH_xxx enumerations. */ | |
228 | ||
229 | static uschar *smtp_names[] = | |
230 | { | |
18481de3 JH |
231 | US"NONE", US"AUTH", US"DATA", US"BDAT", US"EHLO", US"ETRN", US"EXPN", |
232 | US"HELO", US"HELP", US"MAIL", US"NOOP", US"QUIT", US"RCPT", US"RSET", | |
233 | US"STARTTLS", US"VRFY" }; | |
b4ed4da0 | 234 | |
e524074d | 235 | static uschar *protocols_local[] = { |
981756db PH |
236 | US"local-smtp", /* HELO */ |
237 | US"local-smtps", /* The rare case EHLO->STARTTLS->HELO */ | |
238 | US"local-esmtp", /* EHLO */ | |
239 | US"local-esmtps", /* EHLO->STARTTLS->EHLO */ | |
240 | US"local-esmtpa", /* EHLO->AUTH */ | |
241 | US"local-esmtpsa" /* EHLO->STARTTLS->EHLO->AUTH */ | |
059ec3d9 | 242 | }; |
e524074d JH |
243 | static uschar *protocols[] = { |
244 | US"smtp", /* HELO */ | |
245 | US"smtps", /* The rare case EHLO->STARTTLS->HELO */ | |
246 | US"esmtp", /* EHLO */ | |
247 | US"esmtps", /* EHLO->STARTTLS->EHLO */ | |
248 | US"esmtpa", /* EHLO->AUTH */ | |
249 | US"esmtpsa" /* EHLO->STARTTLS->EHLO->AUTH */ | |
250 | }; | |
059ec3d9 PH |
251 | |
252 | #define pnormal 0 | |
981756db PH |
253 | #define pextend 2 |
254 | #define pcrpted 1 /* added to pextend or pnormal */ | |
255 | #define pauthed 2 /* added to pextend */ | |
059ec3d9 | 256 | |
d27f98fe TL |
257 | /* Sanity check and validate optional args to MAIL FROM: envelope */ |
258 | enum { | |
2ef7ed08 | 259 | ENV_MAIL_OPT_NULL, |
d27f98fe | 260 | ENV_MAIL_OPT_SIZE, ENV_MAIL_OPT_BODY, ENV_MAIL_OPT_AUTH, |
8ccd00b1 | 261 | #ifndef DISABLE_PRDR |
fd98a5c6 | 262 | ENV_MAIL_OPT_PRDR, |
6c1c3d1d | 263 | #endif |
6c1c3d1d | 264 | ENV_MAIL_OPT_RET, ENV_MAIL_OPT_ENVID, |
8c5d388a | 265 | #ifdef SUPPORT_I18N |
d1a13eea | 266 | ENV_MAIL_OPT_UTF8, |
8ac90765 JH |
267 | #endif |
268 | #ifdef EXPERIMENTAL_REQUIRETLS | |
269 | ENV_MAIL_OPT_REQTLS, | |
d1a13eea | 270 | #endif |
d27f98fe TL |
271 | }; |
272 | typedef struct { | |
273 | uschar * name; /* option requested during MAIL cmd */ | |
274 | int value; /* enum type */ | |
275 | BOOL need_value; /* TRUE requires value (name=value pair format) | |
276 | FALSE is a singleton */ | |
277 | } env_mail_type_t; | |
278 | static env_mail_type_t env_mail_type_list[] = { | |
279 | { US"SIZE", ENV_MAIL_OPT_SIZE, TRUE }, | |
280 | { US"BODY", ENV_MAIL_OPT_BODY, TRUE }, | |
281 | { US"AUTH", ENV_MAIL_OPT_AUTH, TRUE }, | |
8ccd00b1 | 282 | #ifndef DISABLE_PRDR |
fd98a5c6 | 283 | { US"PRDR", ENV_MAIL_OPT_PRDR, FALSE }, |
6c1c3d1d | 284 | #endif |
6c1c3d1d WB |
285 | { US"RET", ENV_MAIL_OPT_RET, TRUE }, |
286 | { US"ENVID", ENV_MAIL_OPT_ENVID, TRUE }, | |
8c5d388a | 287 | #ifdef SUPPORT_I18N |
d1a13eea | 288 | { US"SMTPUTF8",ENV_MAIL_OPT_UTF8, FALSE }, /* rfc6531 */ |
8ac90765 JH |
289 | #endif |
290 | #ifdef EXPERIMENTAL_REQUIRETLS | |
291 | /* https://tools.ietf.org/html/draft-ietf-uta-smtp-require-tls-03 */ | |
292 | { US"REQUIRETLS",ENV_MAIL_OPT_REQTLS, FALSE }, | |
d1a13eea | 293 | #endif |
2ef7ed08 HSHR |
294 | /* keep this the last entry */ |
295 | { US"NULL", ENV_MAIL_OPT_NULL, FALSE }, | |
d27f98fe TL |
296 | }; |
297 | ||
059ec3d9 PH |
298 | /* When reading SMTP from a remote host, we have to use our own versions of the |
299 | C input-reading functions, in order to be able to flush the SMTP output only | |
300 | when about to read more data from the socket. This is the only way to get | |
301 | optimal performance when the client is using pipelining. Flushing for every | |
302 | command causes a separate packet and reply packet each time; saving all the | |
303 | responses up (when pipelining) combines them into one packet and one response. | |
304 | ||
305 | For simplicity, these functions are used for *all* SMTP input, not only when | |
306 | receiving over a socket. However, after setting up a secure socket (SSL), input | |
307 | is read via the OpenSSL library, and another set of functions is used instead | |
308 | (see tls.c). | |
309 | ||
310 | These functions are set in the receive_getc etc. variables and called with the | |
311 | same interface as the C functions. However, since there can only ever be | |
312 | one incoming SMTP call, we just use a single buffer and flags. There is no need | |
313 | to implement a complicated private FILE-like structure.*/ | |
314 | ||
315 | static uschar *smtp_inbuffer; | |
316 | static uschar *smtp_inptr; | |
317 | static uschar *smtp_inend; | |
318 | static int smtp_had_eof; | |
319 | static int smtp_had_error; | |
320 | ||
321 | ||
7e3ce68e | 322 | /* forward declarations */ |
bd8fbe36 | 323 | static int smtp_read_command(BOOL check_sync, unsigned buffer_lim); |
7e3ce68e JH |
324 | static int synprot_error(int type, int code, uschar *data, uschar *errmess); |
325 | static void smtp_quit_handler(uschar **, uschar **); | |
326 | static void smtp_rset_handler(void); | |
327 | ||
f4630439 JH |
328 | /************************************************* |
329 | * Recheck synchronization * | |
330 | *************************************************/ | |
331 | ||
332 | /* Synchronization checks can never be perfect because a packet may be on its | |
925ac8e4 JH |
333 | way but not arrived when the check is done. Normally, the checks happen when |
334 | commands are read: Exim ensures that there is no more input in the input buffer. | |
335 | In normal cases, the response to the command will be fast, and there is no | |
336 | further check. | |
f4630439 JH |
337 | |
338 | However, for some commands an ACL is run, and that can include delays. In those | |
339 | cases, it is useful to do another check on the input just before sending the | |
340 | response. This also applies at the start of a connection. This function does | |
341 | that check by means of the select() function, as long as the facility is not | |
342 | disabled or inappropriate. A failure of select() is ignored. | |
343 | ||
344 | When there is unwanted input, we read it so that it appears in the log of the | |
345 | error. | |
346 | ||
347 | Arguments: none | |
348 | Returns: TRUE if all is well; FALSE if there is input pending | |
349 | */ | |
350 | ||
351 | static BOOL | |
925ac8e4 | 352 | wouldblock_reading(void) |
f4630439 JH |
353 | { |
354 | int fd, rc; | |
355 | fd_set fds; | |
356 | struct timeval tzero; | |
357 | ||
9067f574 | 358 | #ifdef SUPPORT_TLS |
74f1a423 | 359 | if (tls_in.active.sock >= 0) |
e5de01f0 | 360 | return !tls_could_read(); |
9067f574 | 361 | #endif |
f4630439 | 362 | |
40525d07 JH |
363 | if (smtp_inptr < smtp_inend) |
364 | return FALSE; | |
365 | ||
f4630439 JH |
366 | fd = fileno(smtp_in); |
367 | FD_ZERO(&fds); | |
368 | FD_SET(fd, &fds); | |
369 | tzero.tv_sec = 0; | |
370 | tzero.tv_usec = 0; | |
371 | rc = select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tzero); | |
372 | ||
373 | if (rc <= 0) return TRUE; /* Not ready to read */ | |
bd8fbe36 | 374 | rc = smtp_getc(GETC_BUFFER_UNLIMITED); |
f4630439 JH |
375 | if (rc < 0) return TRUE; /* End of file or error */ |
376 | ||
377 | smtp_ungetc(rc); | |
f4630439 JH |
378 | return FALSE; |
379 | } | |
380 | ||
925ac8e4 JH |
381 | static BOOL |
382 | check_sync(void) | |
383 | { | |
8768d548 | 384 | if (!smtp_enforce_sync || !sender_host_address || f.sender_host_notsocket) |
925ac8e4 JH |
385 | return TRUE; |
386 | ||
387 | return wouldblock_reading(); | |
388 | } | |
389 | ||
390 | ||
391 | /* If there's input waiting (and we're doing pipelineing) then we can pipeline | |
392 | a reponse with the one following. */ | |
393 | ||
394 | static BOOL | |
395 | pipeline_response(void) | |
396 | { | |
397 | if ( !smtp_enforce_sync || !sender_host_address | |
8768d548 | 398 | || f.sender_host_notsocket || !f.smtp_in_pipelining_advertised) |
925ac8e4 JH |
399 | return FALSE; |
400 | ||
3fc73bdc | 401 | if (wouldblock_reading()) return FALSE; |
8768d548 | 402 | f.smtp_in_pipelining_used = TRUE; |
3fc73bdc | 403 | return TRUE; |
925ac8e4 JH |
404 | } |
405 | ||
f4630439 JH |
406 | |
407 | ||
408 | /************************************************* | |
409 | * Log incomplete transactions * | |
410 | *************************************************/ | |
411 | ||
412 | /* This function is called after a transaction has been aborted by RSET, QUIT, | |
413 | connection drops or other errors. It logs the envelope information received | |
414 | so far in order to preserve address verification attempts. | |
415 | ||
416 | Argument: string to indicate what aborted the transaction | |
417 | Returns: nothing | |
418 | */ | |
419 | ||
420 | static void | |
421 | incomplete_transaction_log(uschar *what) | |
422 | { | |
423 | if (sender_address == NULL || /* No transaction in progress */ | |
424 | !LOGGING(smtp_incomplete_transaction)) | |
425 | return; | |
426 | ||
427 | /* Build list of recipients for logging */ | |
428 | ||
429 | if (recipients_count > 0) | |
430 | { | |
431 | int i; | |
432 | raw_recipients = store_get(recipients_count * sizeof(uschar *)); | |
433 | for (i = 0; i < recipients_count; i++) | |
434 | raw_recipients[i] = recipients_list[i].address; | |
435 | raw_recipients_count = recipients_count; | |
436 | } | |
437 | ||
438 | log_write(L_smtp_incomplete_transaction, LOG_MAIN|LOG_SENDER|LOG_RECIPIENTS, | |
439 | "%s incomplete transaction (%s)", host_and_ident(TRUE), what); | |
440 | } | |
441 | ||
442 | ||
443 | ||
444 | ||
9723f966 JH |
445 | void |
446 | smtp_command_timeout_exit(void) | |
447 | { | |
448 | log_write(L_lost_incoming_connection, | |
449 | LOG_MAIN, "SMTP command timeout on%s connection from %s", | |
74f1a423 | 450 | tls_in.active.sock >= 0 ? " TLS" : "", host_and_ident(FALSE)); |
9723f966 JH |
451 | if (smtp_batched_input) |
452 | moan_smtp_batch(NULL, "421 SMTP command timeout"); /* Does not return */ | |
453 | smtp_notquit_exit(US"command-timeout", US"421", | |
454 | US"%s: SMTP command timeout - closing connection", | |
455 | smtp_active_hostname); | |
456 | exim_exit(EXIT_FAILURE, US"receiving"); | |
457 | } | |
458 | ||
459 | void | |
460 | smtp_command_sigterm_exit(void) | |
461 | { | |
462 | log_write(0, LOG_MAIN, "%s closed after SIGTERM", smtp_get_connection_info()); | |
463 | if (smtp_batched_input) | |
464 | moan_smtp_batch(NULL, "421 SIGTERM received"); /* Does not return */ | |
465 | smtp_notquit_exit(US"signal-exit", US"421", | |
466 | US"%s: Service not available - closing connection", smtp_active_hostname); | |
467 | exim_exit(EXIT_FAILURE, US"receiving"); | |
468 | } | |
469 | ||
470 | void | |
471 | smtp_data_timeout_exit(void) | |
472 | { | |
473 | log_write(L_lost_incoming_connection, | |
474 | LOG_MAIN, "SMTP data timeout (message abandoned) on connection from %s F=<%s>", | |
475 | sender_fullhost ? sender_fullhost : US"local process", sender_address); | |
476 | receive_bomb_out(US"data-timeout", US"SMTP incoming data timeout"); | |
477 | /* Does not return */ | |
478 | } | |
479 | ||
480 | void | |
481 | smtp_data_sigint_exit(void) | |
482 | { | |
483 | log_write(0, LOG_MAIN, "%s closed after %s", | |
484 | smtp_get_connection_info(), had_data_sigint == SIGTERM ? "SIGTERM":"SIGINT"); | |
485 | receive_bomb_out(US"signal-exit", | |
486 | US"Service not available - SIGTERM or SIGINT received"); | |
487 | /* Does not return */ | |
488 | } | |
489 | ||
490 | ||
491 | ||
0d81dabc JH |
492 | /* Refill the buffer, and notify DKIM verification code. |
493 | Return false for error or EOF. | |
494 | */ | |
495 | ||
496 | static BOOL | |
497 | smtp_refill(unsigned lim) | |
498 | { | |
499 | int rc, save_errno; | |
500 | if (!smtp_out) return FALSE; | |
501 | fflush(smtp_out); | |
c2a1bba0 | 502 | if (smtp_receive_timeout > 0) ALARM(smtp_receive_timeout); |
0d81dabc | 503 | |
ecce6d9a JH |
504 | /* Limit amount read, so non-message data is not fed to DKIM. |
505 | Take care to not touch the safety NUL at the end of the buffer. */ | |
0d81dabc | 506 | |
ecce6d9a | 507 | rc = read(fileno(smtp_in), smtp_inbuffer, MIN(IN_BUFFER_SIZE-1, lim)); |
0d81dabc | 508 | save_errno = errno; |
c2a1bba0 | 509 | if (smtp_receive_timeout > 0) ALARM_CLR(0); |
0d81dabc JH |
510 | if (rc <= 0) |
511 | { | |
512 | /* Must put the error text in fixed store, because this might be during | |
513 | header reading, where it releases unused store above the header. */ | |
514 | if (rc < 0) | |
515 | { | |
9723f966 JH |
516 | if (had_command_timeout) /* set by signal handler */ |
517 | smtp_command_timeout_exit(); /* does not return */ | |
518 | if (had_command_sigterm) | |
519 | smtp_command_sigterm_exit(); | |
520 | if (had_data_timeout) | |
521 | smtp_data_timeout_exit(); | |
522 | if (had_data_sigint) | |
523 | smtp_data_sigint_exit(); | |
524 | ||
0d81dabc JH |
525 | smtp_had_error = save_errno; |
526 | smtp_read_error = string_copy_malloc( | |
527 | string_sprintf(" (error: %s)", strerror(save_errno))); | |
528 | } | |
9723f966 JH |
529 | else |
530 | smtp_had_eof = 1; | |
0d81dabc JH |
531 | return FALSE; |
532 | } | |
533 | #ifndef DISABLE_DKIM | |
534 | dkim_exim_verify_feed(smtp_inbuffer, rc); | |
535 | #endif | |
536 | smtp_inend = smtp_inbuffer + rc; | |
537 | smtp_inptr = smtp_inbuffer; | |
538 | return TRUE; | |
539 | } | |
540 | ||
059ec3d9 PH |
541 | /************************************************* |
542 | * SMTP version of getc() * | |
543 | *************************************************/ | |
544 | ||
545 | /* This gets the next byte from the SMTP input buffer. If the buffer is empty, | |
546 | it flushes the output, and refills the buffer, with a timeout. The signal | |
547 | handler is set appropriately by the calling function. This function is not used | |
4c04137d | 548 | after a connection has negotiated itself into an TLS/SSL state. |
059ec3d9 | 549 | |
bd8fbe36 | 550 | Arguments: lim Maximum amount to read/buffer |
059ec3d9 PH |
551 | Returns: the next character or EOF |
552 | */ | |
553 | ||
554 | int | |
bd8fbe36 | 555 | smtp_getc(unsigned lim) |
059ec3d9 PH |
556 | { |
557 | if (smtp_inptr >= smtp_inend) | |
0d81dabc | 558 | if (!smtp_refill(lim)) |
059ec3d9 | 559 | return EOF; |
059ec3d9 PH |
560 | return *smtp_inptr++; |
561 | } | |
562 | ||
0d81dabc JH |
563 | uschar * |
564 | smtp_getbuf(unsigned * len) | |
565 | { | |
566 | unsigned size; | |
567 | uschar * buf; | |
568 | ||
569 | if (smtp_inptr >= smtp_inend) | |
570 | if (!smtp_refill(*len)) | |
571 | { *len = 0; return NULL; } | |
572 | ||
573 | if ((size = smtp_inend - smtp_inptr) > *len) size = *len; | |
574 | buf = smtp_inptr; | |
575 | smtp_inptr += size; | |
576 | *len = size; | |
577 | return buf; | |
578 | } | |
579 | ||
584e96c6 JH |
580 | void |
581 | smtp_get_cache(void) | |
582 | { | |
9960d1e5 | 583 | #ifndef DISABLE_DKIM |
584e96c6 JH |
584 | int n = smtp_inend - smtp_inptr; |
585 | if (n > 0) | |
586 | dkim_exim_verify_feed(smtp_inptr, n); | |
584e96c6 | 587 | #endif |
9960d1e5 | 588 | } |
059ec3d9 PH |
589 | |
590 | ||
7e3ce68e JH |
591 | /* Get a byte from the smtp input, in CHUNKING mode. Handle ack of the |
592 | previous BDAT chunk and getting new ones when we run out. Uses the | |
593 | underlying smtp_getc or tls_getc both for that and for getting the | |
594 | (buffered) data byte. EOD signals (an expected) no further data. | |
595 | ERR signals a protocol error, and EOF a closed input stream. | |
596 | ||
597 | Called from read_bdat_smtp() in receive.c for the message body, but also | |
598 | by the headers read loop in receive_msg(); manipulates chunking_state | |
599 | to handle the BDAT command/response. | |
600 | Placed here due to the correlation with the above smtp_getc(), which it wraps, | |
601 | and also by the need to do smtp command/response handling. | |
602 | ||
bd8fbe36 | 603 | Arguments: lim (ignored) |
7e3ce68e JH |
604 | Returns: the next character or ERR, EOD or EOF |
605 | */ | |
606 | ||
607 | int | |
bd8fbe36 | 608 | bdat_getc(unsigned lim) |
7e3ce68e JH |
609 | { |
610 | uschar * user_msg = NULL; | |
611 | uschar * log_msg; | |
612 | ||
613 | for(;;) | |
614 | { | |
79de4f37 | 615 | #ifndef DISABLE_DKIM |
64b67b65 | 616 | unsigned dkim_save; |
79de4f37 JH |
617 | #endif |
618 | ||
bd8fbe36 JH |
619 | if (chunking_data_left > 0) |
620 | return lwr_receive_getc(chunking_data_left--); | |
7e3ce68e JH |
621 | |
622 | receive_getc = lwr_receive_getc; | |
0d81dabc | 623 | receive_getbuf = lwr_receive_getbuf; |
7e3ce68e | 624 | receive_ungetc = lwr_receive_ungetc; |
bd8fbe36 | 625 | #ifndef DISABLE_DKIM |
79de4f37 | 626 | dkim_save = dkim_collect_input; |
64b67b65 | 627 | dkim_collect_input = 0; |
bd8fbe36 | 628 | #endif |
7e3ce68e | 629 | |
f4630439 JH |
630 | /* Unless PIPELINING was offered, there should be no next command |
631 | until after we ack that chunk */ | |
632 | ||
8768d548 | 633 | if (!f.smtp_in_pipelining_advertised && !check_sync()) |
f4630439 | 634 | { |
40525d07 JH |
635 | unsigned n = smtp_inend - smtp_inptr; |
636 | if (n > 32) n = 32; | |
637 | ||
f4630439 JH |
638 | incomplete_transaction_log(US"sync failure"); |
639 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol synchronization error " | |
640 | "(next input sent too soon: pipelining was not advertised): " | |
9e0ed81f | 641 | "rejected \"%s\" %s next input=\"%s\"%s", |
f4630439 | 642 | smtp_cmd_buffer, host_and_ident(TRUE), |
9e0ed81f JH |
643 | string_printing(string_copyn(smtp_inptr, n)), |
644 | smtp_inend - smtp_inptr > n ? "..." : ""); | |
645 | (void) synprot_error(L_smtp_protocol_error, 554, NULL, | |
646 | US"SMTP synchronization error"); | |
f4630439 JH |
647 | goto repeat_until_rset; |
648 | } | |
649 | ||
7e3ce68e JH |
650 | /* If not the last, ack the received chunk. The last response is delayed |
651 | until after the data ACL decides on it */ | |
7e3ce68e JH |
652 | |
653 | if (chunking_state == CHUNKING_LAST) | |
584e96c6 JH |
654 | { |
655 | #ifndef DISABLE_DKIM | |
e983e85a | 656 | dkim_exim_verify_feed(NULL, 0); /* notify EOD */ |
584e96c6 | 657 | #endif |
7e3ce68e | 658 | return EOD; |
584e96c6 | 659 | } |
7e3ce68e | 660 | |
925ac8e4 | 661 | smtp_printf("250 %u byte chunk received\r\n", FALSE, chunking_datasize); |
bd8fbe36 JH |
662 | chunking_state = CHUNKING_OFFERED; |
663 | DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state); | |
7e3ce68e JH |
664 | |
665 | /* Expect another BDAT cmd from input. RFC 3030 says nothing about | |
666 | QUIT, RSET or NOOP but handling them seems obvious */ | |
667 | ||
668 | next_cmd: | |
bd8fbe36 | 669 | switch(smtp_read_command(TRUE, 1)) |
7e3ce68e JH |
670 | { |
671 | default: | |
672 | (void) synprot_error(L_smtp_protocol_error, 503, NULL, | |
673 | US"only BDAT permissible after non-LAST BDAT"); | |
674 | ||
675 | repeat_until_rset: | |
bd8fbe36 | 676 | switch(smtp_read_command(TRUE, 1)) |
7e3ce68e JH |
677 | { |
678 | case QUIT_CMD: smtp_quit_handler(&user_msg, &log_msg); /*FALLTHROUGH */ | |
679 | case EOF_CMD: return EOF; | |
680 | case RSET_CMD: smtp_rset_handler(); return ERR; | |
681 | default: if (synprot_error(L_smtp_protocol_error, 503, NULL, | |
682 | US"only RSET accepted now") > 0) | |
683 | return EOF; | |
684 | goto repeat_until_rset; | |
685 | } | |
686 | ||
687 | case QUIT_CMD: | |
688 | smtp_quit_handler(&user_msg, &log_msg); | |
689 | /*FALLTHROUGH*/ | |
690 | case EOF_CMD: | |
691 | return EOF; | |
692 | ||
693 | case RSET_CMD: | |
694 | smtp_rset_handler(); | |
695 | return ERR; | |
696 | ||
697 | case NOOP_CMD: | |
698 | HAD(SCH_NOOP); | |
925ac8e4 | 699 | smtp_printf("250 OK\r\n", FALSE); |
7e3ce68e JH |
700 | goto next_cmd; |
701 | ||
702 | case BDAT_CMD: | |
703 | { | |
704 | int n; | |
705 | ||
706 | if (sscanf(CS smtp_cmd_data, "%u %n", &chunking_datasize, &n) < 1) | |
707 | { | |
708 | (void) synprot_error(L_smtp_protocol_error, 501, NULL, | |
709 | US"missing size for BDAT command"); | |
710 | return ERR; | |
711 | } | |
712 | chunking_state = strcmpic(smtp_cmd_data+n, US"LAST") == 0 | |
713 | ? CHUNKING_LAST : CHUNKING_ACTIVE; | |
714 | chunking_data_left = chunking_datasize; | |
bd8fbe36 JH |
715 | DEBUG(D_receive) debug_printf("chunking state %d, %d bytes\n", |
716 | (int)chunking_state, chunking_data_left); | |
7e3ce68e JH |
717 | |
718 | if (chunking_datasize == 0) | |
719 | if (chunking_state == CHUNKING_LAST) | |
720 | return EOD; | |
721 | else | |
722 | { | |
723 | (void) synprot_error(L_smtp_protocol_error, 504, NULL, | |
724 | US"zero size for BDAT command"); | |
725 | goto repeat_until_rset; | |
726 | } | |
727 | ||
728 | receive_getc = bdat_getc; | |
8b77d27a | 729 | receive_getbuf = bdat_getbuf; /* r~getbuf is never actually used */ |
7e3ce68e | 730 | receive_ungetc = bdat_ungetc; |
bd8fbe36 | 731 | #ifndef DISABLE_DKIM |
79de4f37 | 732 | dkim_collect_input = dkim_save; |
bd8fbe36 | 733 | #endif |
7e3ce68e JH |
734 | break; /* to top of main loop */ |
735 | } | |
736 | } | |
737 | } | |
738 | } | |
739 | ||
0d81dabc JH |
740 | uschar * |
741 | bdat_getbuf(unsigned * len) | |
742 | { | |
743 | uschar * buf; | |
744 | ||
745 | if (chunking_data_left <= 0) | |
746 | { *len = 0; return NULL; } | |
747 | ||
748 | if (*len > chunking_data_left) *len = chunking_data_left; | |
749 | buf = lwr_receive_getbuf(len); /* Either smtp_getbuf or tls_getbuf */ | |
750 | chunking_data_left -= *len; | |
751 | return buf; | |
752 | } | |
753 | ||
1ebe15c3 | 754 | void |
45bd315d JH |
755 | bdat_flush_data(void) |
756 | { | |
e99a3a6c | 757 | while (chunking_data_left) |
db57e575 | 758 | { |
e99a3a6c | 759 | unsigned n = chunking_data_left; |
8b77d27a | 760 | if (!bdat_getbuf(&n)) break; |
db57e575 | 761 | } |
45bd315d JH |
762 | |
763 | receive_getc = lwr_receive_getc; | |
0d81dabc | 764 | receive_getbuf = lwr_receive_getbuf; |
45bd315d JH |
765 | receive_ungetc = lwr_receive_ungetc; |
766 | ||
767 | if (chunking_state != CHUNKING_LAST) | |
bd8fbe36 | 768 | { |
45bd315d | 769 | chunking_state = CHUNKING_OFFERED; |
bd8fbe36 JH |
770 | DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state); |
771 | } | |
45bd315d JH |
772 | } |
773 | ||
7e3ce68e JH |
774 | |
775 | ||
776 | ||
059ec3d9 PH |
777 | /************************************************* |
778 | * SMTP version of ungetc() * | |
779 | *************************************************/ | |
780 | ||
781 | /* Puts a character back in the input buffer. Only ever | |
782 | called once. | |
783 | ||
784 | Arguments: | |
785 | ch the character | |
786 | ||
787 | Returns: the character | |
788 | */ | |
789 | ||
790 | int | |
791 | smtp_ungetc(int ch) | |
792 | { | |
7e3ce68e | 793 | *--smtp_inptr = ch; |
059ec3d9 PH |
794 | return ch; |
795 | } | |
796 | ||
797 | ||
7e3ce68e JH |
798 | int |
799 | bdat_ungetc(int ch) | |
800 | { | |
801 | chunking_data_left++; | |
802 | return lwr_receive_ungetc(ch); | |
803 | } | |
804 | ||
059ec3d9 PH |
805 | |
806 | ||
807 | /************************************************* | |
808 | * SMTP version of feof() * | |
809 | *************************************************/ | |
810 | ||
811 | /* Tests for a previous EOF | |
812 | ||
813 | Arguments: none | |
814 | Returns: non-zero if the eof flag is set | |
815 | */ | |
816 | ||
817 | int | |
818 | smtp_feof(void) | |
819 | { | |
820 | return smtp_had_eof; | |
821 | } | |
822 | ||
823 | ||
824 | ||
825 | ||
826 | /************************************************* | |
827 | * SMTP version of ferror() * | |
828 | *************************************************/ | |
829 | ||
830 | /* Tests for a previous read error, and returns with errno | |
831 | restored to what it was when the error was detected. | |
832 | ||
833 | Arguments: none | |
834 | Returns: non-zero if the error flag is set | |
835 | */ | |
836 | ||
837 | int | |
838 | smtp_ferror(void) | |
839 | { | |
840 | errno = smtp_had_error; | |
841 | return smtp_had_error; | |
842 | } | |
843 | ||
844 | ||
845 | ||
58eb016e PH |
846 | /************************************************* |
847 | * Test for characters in the SMTP buffer * | |
848 | *************************************************/ | |
849 | ||
850 | /* Used at the end of a message | |
851 | ||
852 | Arguments: none | |
853 | Returns: TRUE/FALSE | |
854 | */ | |
855 | ||
856 | BOOL | |
857 | smtp_buffered(void) | |
858 | { | |
859 | return smtp_inptr < smtp_inend; | |
860 | } | |
861 | ||
862 | ||
059ec3d9 PH |
863 | |
864 | /************************************************* | |
865 | * Write formatted string to SMTP channel * | |
866 | *************************************************/ | |
867 | ||
868 | /* This is a separate function so that we don't have to repeat everything for | |
869 | TLS support or debugging. It is global so that the daemon and the | |
870 | authentication functions can use it. It does not return any error indication, | |
871 | because major problems such as dropped connections won't show up till an output | |
872 | flush for non-TLS connections. The smtp_fflush() function is available for | |
873 | checking that: for convenience, TLS output errors are remembered here so that | |
874 | they are also picked up later by smtp_fflush(). | |
875 | ||
876 | Arguments: | |
877 | format format string | |
925ac8e4 | 878 | more further data expected |
059ec3d9 PH |
879 | ... optional arguments |
880 | ||
881 | Returns: nothing | |
882 | */ | |
883 | ||
884 | void | |
925ac8e4 | 885 | smtp_printf(const char *format, BOOL more, ...) |
059ec3d9 PH |
886 | { |
887 | va_list ap; | |
888 | ||
925ac8e4 JH |
889 | va_start(ap, more); |
890 | smtp_vprintf(format, more, ap); | |
ce552449 NM |
891 | va_end(ap); |
892 | } | |
893 | ||
894 | /* This is split off so that verify.c:respond_printf() can, in effect, call | |
895 | smtp_printf(), bearing in mind that in C a vararg function can't directly | |
fb08281f | 896 | call another vararg function, only a function which accepts a va_list. */ |
ce552449 NM |
897 | |
898 | void | |
925ac8e4 | 899 | smtp_vprintf(const char *format, BOOL more, va_list ap) |
ce552449 | 900 | { |
fb08281f DW |
901 | BOOL yield; |
902 | ||
903 | yield = string_vformat(big_buffer, big_buffer_size, format, ap); | |
ce552449 | 904 | |
059ec3d9 PH |
905 | DEBUG(D_receive) |
906 | { | |
fb08281f DW |
907 | void *reset_point = store_get(0); |
908 | uschar *msg_copy, *cr, *end; | |
909 | msg_copy = string_copy(big_buffer); | |
910 | end = msg_copy + Ustrlen(msg_copy); | |
911 | while ((cr = Ustrchr(msg_copy, '\r')) != NULL) /* lose CRs */ | |
912 | memmove(cr, cr + 1, (end--) - cr); | |
913 | debug_printf("SMTP>> %s", msg_copy); | |
914 | store_reset(reset_point); | |
059ec3d9 PH |
915 | } |
916 | ||
fb08281f | 917 | if (!yield) |
2679d413 PH |
918 | { |
919 | log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_printf()"); | |
920 | smtp_closedown(US"Unexpected error"); | |
9bfb7e1b | 921 | exim_exit(EXIT_FAILURE, NULL); |
2679d413 | 922 | } |
2679d413 PH |
923 | |
924 | /* If this is the first output for a (non-batch) RCPT command, see if all RCPTs | |
925 | have had the same. Note: this code is also present in smtp_respond(). It would | |
926 | be tidier to have it only in one place, but when it was added, it was easier to | |
927 | do it that way, so as not to have to mess with the code for the RCPT command, | |
928 | which sometimes uses smtp_printf() and sometimes smtp_respond(). */ | |
929 | ||
88752192 | 930 | if (fl.rcpt_in_progress) |
2679d413 PH |
931 | { |
932 | if (rcpt_smtp_response == NULL) | |
933 | rcpt_smtp_response = string_copy(big_buffer); | |
88752192 | 934 | else if (fl.rcpt_smtp_response_same && |
2679d413 | 935 | Ustrcmp(rcpt_smtp_response, big_buffer) != 0) |
88752192 JH |
936 | fl.rcpt_smtp_response_same = FALSE; |
937 | fl.rcpt_in_progress = FALSE; | |
2679d413 | 938 | } |
059ec3d9 | 939 | |
2679d413 | 940 | /* Now write the string */ |
059ec3d9 PH |
941 | |
942 | #ifdef SUPPORT_TLS | |
74f1a423 | 943 | if (tls_in.active.sock >= 0) |
059ec3d9 | 944 | { |
74f1a423 | 945 | if (tls_write(NULL, big_buffer, Ustrlen(big_buffer), more) < 0) |
817d9f57 | 946 | smtp_write_error = -1; |
059ec3d9 PH |
947 | } |
948 | else | |
949 | #endif | |
950 | ||
2679d413 | 951 | if (fprintf(smtp_out, "%s", big_buffer) < 0) smtp_write_error = -1; |
059ec3d9 PH |
952 | } |
953 | ||
954 | ||
955 | ||
956 | /************************************************* | |
957 | * Flush SMTP out and check for error * | |
958 | *************************************************/ | |
959 | ||
960 | /* This function isn't currently used within Exim (it detects errors when it | |
961 | tries to read the next SMTP input), but is available for use in local_scan(). | |
962 | For non-TLS connections, it flushes the output and checks for errors. For | |
963 | TLS-connections, it checks for a previously-detected TLS write error. | |
964 | ||
965 | Arguments: none | |
966 | Returns: 0 for no error; -1 after an error | |
967 | */ | |
968 | ||
969 | int | |
970 | smtp_fflush(void) | |
971 | { | |
74f1a423 | 972 | if (tls_in.active.sock < 0 && fflush(smtp_out) != 0) smtp_write_error = -1; |
059ec3d9 PH |
973 | return smtp_write_error; |
974 | } | |
975 | ||
976 | ||
977 | ||
978 | /************************************************* | |
979 | * SMTP command read timeout * | |
980 | *************************************************/ | |
981 | ||
982 | /* Signal handler for timing out incoming SMTP commands. This attempts to | |
983 | finish off tidily. | |
984 | ||
985 | Argument: signal number (SIGALRM) | |
986 | Returns: nothing | |
987 | */ | |
988 | ||
989 | static void | |
990 | command_timeout_handler(int sig) | |
991 | { | |
9723f966 | 992 | had_command_timeout = sig; |
059ec3d9 PH |
993 | } |
994 | ||
995 | ||
996 | ||
997 | /************************************************* | |
998 | * SIGTERM received * | |
999 | *************************************************/ | |
1000 | ||
1001 | /* Signal handler for handling SIGTERM. Again, try to finish tidily. | |
1002 | ||
1003 | Argument: signal number (SIGTERM) | |
1004 | Returns: nothing | |
1005 | */ | |
1006 | ||
1007 | static void | |
1008 | command_sigterm_handler(int sig) | |
1009 | { | |
9723f966 | 1010 | had_command_sigterm = sig; |
059ec3d9 PH |
1011 | } |
1012 | ||
1013 | ||
1014 | ||
a14e5636 | 1015 | |
cee5f132 | 1016 | #ifdef SUPPORT_PROXY |
a3bddaa8 TL |
1017 | /************************************************* |
1018 | * Restore socket timeout to previous value * | |
1019 | *************************************************/ | |
1020 | /* If the previous value was successfully retrieved, restore | |
1021 | it before returning control to the non-proxy routines | |
1022 | ||
1023 | Arguments: fd - File descriptor for input | |
1024 | get_ok - Successfully retrieved previous values | |
1025 | tvtmp - Time struct with previous values | |
1026 | vslen - Length of time struct | |
1027 | Returns: none | |
1028 | */ | |
1029 | static void | |
f267271d | 1030 | restore_socket_timeout(int fd, int get_ok, struct timeval * tvtmp, socklen_t vslen) |
a3bddaa8 TL |
1031 | { |
1032 | if (get_ok == 0) | |
f267271d | 1033 | (void) setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS tvtmp, vslen); |
a3bddaa8 TL |
1034 | } |
1035 | ||
a3c86431 TL |
1036 | /************************************************* |
1037 | * Check if host is required proxy host * | |
1038 | *************************************************/ | |
1039 | /* The function determines if inbound host will be a regular smtp host | |
1811cb4c JH |
1040 | or if it is configured that it must use Proxy Protocol. A local |
1041 | connection cannot. | |
a3c86431 TL |
1042 | |
1043 | Arguments: none | |
1044 | Returns: bool | |
1045 | */ | |
1046 | ||
1047 | static BOOL | |
1048 | check_proxy_protocol_host() | |
1049 | { | |
1050 | int rc; | |
a3c86431 | 1051 | |
1811cb4c JH |
1052 | if ( sender_host_address |
1053 | && (rc = verify_check_this_host(CUSS &hosts_proxy, NULL, NULL, | |
1054 | sender_host_address, NULL)) == OK) | |
a3c86431 TL |
1055 | { |
1056 | DEBUG(D_receive) | |
1057 | debug_printf("Detected proxy protocol configured host\n"); | |
1058 | proxy_session = TRUE; | |
1059 | } | |
1060 | return proxy_session; | |
1061 | } | |
1062 | ||
1063 | ||
3f251b3c PP |
1064 | /************************************************* |
1065 | * Read data until newline or end of buffer * | |
1066 | *************************************************/ | |
1067 | /* While SMTP is server-speaks-first, TLS is client-speaks-first, so we can't | |
1068 | read an entire buffer and assume there will be nothing past a proxy protocol | |
1069 | header. Our approach normally is to use stdio, but again that relies upon | |
1070 | "STARTTLS\r\n" and a server response before the client starts TLS handshake, or | |
1071 | reading _nothing_ before client TLS handshake. So we don't want to use the | |
1072 | usual buffering reads which may read enough to block TLS starting. | |
1073 | ||
1074 | So unfortunately we're down to "read one byte at a time, with a syscall each, | |
1075 | and expect a little overhead", for all proxy-opened connections which are v1, | |
1076 | just to handle the TLS-on-connect case. Since SSL functions wrap the | |
1077 | underlying fd, we can't assume that we can feed them any already-read content. | |
1078 | ||
1079 | We need to know where to read to, the max capacity, and we'll read until we | |
1080 | get a CR and one more character. Let the caller scream if it's CR+!LF. | |
1081 | ||
1082 | Return the amount read. | |
1083 | */ | |
1084 | ||
1085 | static int | |
da88acae | 1086 | swallow_until_crlf(int fd, uschar *base, int already, int capacity) |
3f251b3c | 1087 | { |
2c0f3ea1 JH |
1088 | uschar *to = base + already; |
1089 | uschar *cr; | |
1090 | int have = 0; | |
1091 | int ret; | |
1092 | int last = 0; | |
1093 | ||
1094 | /* For "PROXY UNKNOWN\r\n" we, at time of writing, expect to have read | |
1095 | up through the \r; for the _normal_ case, we haven't yet seen the \r. */ | |
da88acae | 1096 | |
2c0f3ea1 JH |
1097 | cr = memchr(base, '\r', already); |
1098 | if (cr != NULL) | |
1099 | { | |
1100 | if ((cr - base) < already - 1) | |
da88acae | 1101 | { |
2c0f3ea1 JH |
1102 | /* \r and presumed \n already within what we have; probably not |
1103 | actually proxy protocol, but abort cleanly. */ | |
1104 | return 0; | |
da88acae | 1105 | } |
2c0f3ea1 JH |
1106 | /* \r is last character read, just need one more. */ |
1107 | last = 1; | |
1108 | } | |
1109 | ||
1110 | while (capacity > 0) | |
1111 | { | |
1112 | do { ret = recv(fd, to, 1, 0); } while (ret == -1 && errno == EINTR); | |
1113 | if (ret == -1) | |
1114 | return -1; | |
1115 | have++; | |
1116 | if (last) | |
1117 | return have; | |
1118 | if (*to == '\r') | |
1119 | last = 1; | |
1120 | capacity--; | |
1121 | to++; | |
1122 | } | |
1123 | ||
1124 | /* reached end without having room for a final newline, abort */ | |
1125 | errno = EOVERFLOW; | |
1126 | return -1; | |
3f251b3c PP |
1127 | } |
1128 | ||
a3c86431 TL |
1129 | /************************************************* |
1130 | * Setup host for proxy protocol * | |
1131 | *************************************************/ | |
1132 | /* The function configures the connection based on a header from the | |
1133 | inbound host to use Proxy Protocol. The specification is very exact | |
1134 | so exit with an error if do not find the exact required pieces. This | |
1135 | includes an incorrect number of spaces separating args. | |
1136 | ||
1137 | Arguments: none | |
f267271d | 1138 | Returns: Boolean success |
a3c86431 TL |
1139 | */ |
1140 | ||
1811cb4c | 1141 | static void |
a3c86431 TL |
1142 | setup_proxy_protocol_host() |
1143 | { | |
1144 | union { | |
1145 | struct { | |
1146 | uschar line[108]; | |
1147 | } v1; | |
1148 | struct { | |
1149 | uschar sig[12]; | |
36719342 TL |
1150 | uint8_t ver_cmd; |
1151 | uint8_t fam; | |
1152 | uint16_t len; | |
a3c86431 TL |
1153 | union { |
1154 | struct { /* TCP/UDP over IPv4, len = 12 */ | |
1155 | uint32_t src_addr; | |
1156 | uint32_t dst_addr; | |
1157 | uint16_t src_port; | |
1158 | uint16_t dst_port; | |
1159 | } ip4; | |
1160 | struct { /* TCP/UDP over IPv6, len = 36 */ | |
1161 | uint8_t src_addr[16]; | |
1162 | uint8_t dst_addr[16]; | |
1163 | uint16_t src_port; | |
1164 | uint16_t dst_port; | |
1165 | } ip6; | |
1166 | struct { /* AF_UNIX sockets, len = 216 */ | |
1167 | uschar src_addr[108]; | |
1168 | uschar dst_addr[108]; | |
1169 | } unx; | |
1170 | } addr; | |
1171 | } v2; | |
1172 | } hdr; | |
1173 | ||
eb57651e TL |
1174 | /* Temp variables used in PPv2 address:port parsing */ |
1175 | uint16_t tmpport; | |
1176 | char tmpip[INET_ADDRSTRLEN]; | |
1177 | struct sockaddr_in tmpaddr; | |
1178 | char tmpip6[INET6_ADDRSTRLEN]; | |
1179 | struct sockaddr_in6 tmpaddr6; | |
1180 | ||
da88acae PP |
1181 | /* We can't read "all data until end" because while SMTP is |
1182 | server-speaks-first, the TLS handshake is client-speaks-first, so for | |
1183 | TLS-on-connect ports the proxy protocol header will usually be immediately | |
1184 | followed by a TLS handshake, and with N TLS libraries, we can't reliably | |
1185 | reinject data for reading by those. So instead we first read "enough to be | |
1186 | safely read within the header, and figure out how much more to read". | |
1187 | For v1 we will later read to the end-of-line, for v2 we will read based upon | |
1188 | the stated length. | |
1189 | ||
1190 | The v2 sig is 12 octets, and another 4 gets us the length, so we know how much | |
1191 | data is needed total. For v1, where the line looks like: | |
1192 | PROXY TCPn L3src L3dest SrcPort DestPort \r\n | |
1193 | ||
1194 | However, for v1 there's also `PROXY UNKNOWN\r\n` which is only 15 octets. | |
1195 | We seem to support that. So, if we read 14 octets then we can tell if we're | |
1196 | v2 or v1. If we're v1, we can continue reading as normal. | |
1197 | ||
1198 | If we're v2, we can't slurp up the entire header. We need the length in the | |
1199 | 15th & 16th octets, then to read everything after that. | |
1200 | ||
1201 | So to safely handle v1 and v2, with client-sent-first supported correctly, | |
1202 | we have to do a minimum of 3 read calls, not 1. Eww. | |
1203 | */ | |
1204 | ||
1205 | #define PROXY_INITIAL_READ 14 | |
1206 | #define PROXY_V2_HEADER_SIZE 16 | |
1207 | #if PROXY_INITIAL_READ > PROXY_V2_HEADER_SIZE | |
1208 | # error Code bug in sizes of data to read for proxy usage | |
1209 | #endif | |
1210 | ||
eb57651e | 1211 | int get_ok = 0; |
f267271d JH |
1212 | int size, ret; |
1213 | int fd = fileno(smtp_in); | |
36719342 | 1214 | const char v2sig[12] = "\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A"; |
9e7e0f6a | 1215 | uschar * iptype; /* To display debug info */ |
a3c86431 | 1216 | struct timeval tv; |
a3bddaa8 | 1217 | struct timeval tvtmp; |
f267271d | 1218 | socklen_t vslen = sizeof(struct timeval); |
1811cb4c | 1219 | BOOL yield = FALSE; |
a3c86431 | 1220 | |
a3bddaa8 | 1221 | /* Save current socket timeout values */ |
f267271d | 1222 | get_ok = getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tvtmp, &vslen); |
a3bddaa8 | 1223 | |
a3c86431 TL |
1224 | /* Proxy Protocol host must send header within a short time |
1225 | (default 3 seconds) or it's considered invalid */ | |
1226 | tv.tv_sec = PROXY_NEGOTIATION_TIMEOUT_SEC; | |
1227 | tv.tv_usec = PROXY_NEGOTIATION_TIMEOUT_USEC; | |
f267271d | 1228 | if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tv, sizeof(tv)) < 0) |
1811cb4c | 1229 | goto bad; |
a3bddaa8 | 1230 | |
a3c86431 TL |
1231 | do |
1232 | { | |
eb57651e | 1233 | /* The inbound host was declared to be a Proxy Protocol host, so |
2c0f3ea1 JH |
1234 | don't do a PEEK into the data, actually slurp up enough to be |
1235 | "safe". Can't take it all because TLS-on-connect clients follow | |
1236 | immediately with TLS handshake. */ | |
3f251b3c | 1237 | ret = recv(fd, &hdr, PROXY_INITIAL_READ, 0); |
a3c86431 TL |
1238 | } |
1239 | while (ret == -1 && errno == EINTR); | |
1240 | ||
1241 | if (ret == -1) | |
f267271d | 1242 | goto proxyfail; |
a3c86431 | 1243 | |
da88acae PP |
1244 | /* For v2, handle reading the length, and then the rest. */ |
1245 | if ((ret == PROXY_INITIAL_READ) && (memcmp(&hdr.v2, v2sig, sizeof(v2sig)) == 0)) | |
a3c86431 | 1246 | { |
da88acae PP |
1247 | int retmore; |
1248 | uint8_t ver; | |
1249 | ||
1250 | /* First get the length fields. */ | |
1251 | do | |
1252 | { | |
1253 | retmore = recv(fd, (uschar*)&hdr + ret, PROXY_V2_HEADER_SIZE - PROXY_INITIAL_READ, 0); | |
1254 | } while (retmore == -1 && errno == EINTR); | |
1255 | if (retmore == -1) | |
3f251b3c | 1256 | goto proxyfail; |
da88acae | 1257 | ret += retmore; |
3f251b3c PP |
1258 | |
1259 | ver = (hdr.v2.ver_cmd & 0xf0) >> 4; | |
36719342 TL |
1260 | |
1261 | /* May 2014: haproxy combined the version and command into one byte to | |
2c0f3ea1 JH |
1262 | allow two full bytes for the length field in order to proxy SSL |
1263 | connections. SSL Proxy is not supported in this version of Exim, but | |
1264 | must still separate values here. */ | |
36719342 TL |
1265 | |
1266 | if (ver != 0x02) | |
1267 | { | |
1268 | DEBUG(D_receive) debug_printf("Invalid Proxy Protocol version: %d\n", ver); | |
1269 | goto proxyfail; | |
1270 | } | |
da88acae | 1271 | |
36719342 | 1272 | /* The v2 header will always be 16 bytes per the spec. */ |
5d036699 | 1273 | size = 16 + ntohs(hdr.v2.len); |
da88acae PP |
1274 | DEBUG(D_receive) debug_printf("Detected PROXYv2 header, size %d (limit %d)\n", |
1275 | size, (int)sizeof(hdr)); | |
1276 | ||
1277 | /* We should now have 16 octets (PROXY_V2_HEADER_SIZE), and we know the total | |
1278 | amount that we need. Double-check that the size is not unreasonable, then | |
1279 | get the rest. */ | |
1280 | if (size > sizeof(hdr)) | |
a3c86431 | 1281 | { |
da88acae | 1282 | DEBUG(D_receive) debug_printf("PROXYv2 header size unreasonably large; security attack?\n"); |
a3c86431 TL |
1283 | goto proxyfail; |
1284 | } | |
da88acae PP |
1285 | |
1286 | do | |
1287 | { | |
1288 | do | |
1289 | { | |
1290 | retmore = recv(fd, (uschar*)&hdr + ret, size-ret, 0); | |
1291 | } while (retmore == -1 && errno == EINTR); | |
1292 | if (retmore == -1) | |
1293 | goto proxyfail; | |
1294 | ret += retmore; | |
1295 | DEBUG(D_receive) debug_printf("PROXYv2: have %d/%d required octets\n", ret, size); | |
1296 | } while (ret < size); | |
1297 | ||
1298 | } /* end scope for getting rest of data for v2 */ | |
1299 | ||
1300 | /* At this point: if PROXYv2, we've read the exact size required for all data; | |
1301 | if PROXYv1 then we've read "less than required for any valid line" and should | |
1302 | read the rest". */ | |
1303 | ||
1304 | if (ret >= 16 && memcmp(&hdr.v2, v2sig, 12) == 0) | |
1305 | { | |
1306 | uint8_t cmd = (hdr.v2.ver_cmd & 0x0f); | |
1307 | ||
36719342 | 1308 | switch (cmd) |
a3c86431 TL |
1309 | { |
1310 | case 0x01: /* PROXY command */ | |
1311 | switch (hdr.v2.fam) | |
1312 | { | |
eb57651e TL |
1313 | case 0x11: /* TCPv4 address type */ |
1314 | iptype = US"IPv4"; | |
1315 | tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.src_addr; | |
5d036699 JH |
1316 | inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip)); |
1317 | if (!string_is_ip_address(US tmpip, NULL)) | |
eb57651e TL |
1318 | { |
1319 | DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype); | |
f267271d | 1320 | goto proxyfail; |
eb57651e | 1321 | } |
e6d2a989 | 1322 | proxy_local_address = sender_host_address; |
eb57651e TL |
1323 | sender_host_address = string_copy(US tmpip); |
1324 | tmpport = ntohs(hdr.v2.addr.ip4.src_port); | |
e6d2a989 | 1325 | proxy_local_port = sender_host_port; |
eb57651e TL |
1326 | sender_host_port = tmpport; |
1327 | /* Save dest ip/port */ | |
1328 | tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.dst_addr; | |
5d036699 JH |
1329 | inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip)); |
1330 | if (!string_is_ip_address(US tmpip, NULL)) | |
eb57651e TL |
1331 | { |
1332 | DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype); | |
f267271d | 1333 | goto proxyfail; |
eb57651e | 1334 | } |
7a2fa0bc | 1335 | proxy_external_address = string_copy(US tmpip); |
eb57651e | 1336 | tmpport = ntohs(hdr.v2.addr.ip4.dst_port); |
7a2fa0bc | 1337 | proxy_external_port = tmpport; |
a3c86431 | 1338 | goto done; |
eb57651e TL |
1339 | case 0x21: /* TCPv6 address type */ |
1340 | iptype = US"IPv6"; | |
1341 | memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.src_addr, 16); | |
5d036699 JH |
1342 | inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6)); |
1343 | if (!string_is_ip_address(US tmpip6, NULL)) | |
eb57651e TL |
1344 | { |
1345 | DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype); | |
f267271d | 1346 | goto proxyfail; |
eb57651e | 1347 | } |
e6d2a989 | 1348 | proxy_local_address = sender_host_address; |
eb57651e TL |
1349 | sender_host_address = string_copy(US tmpip6); |
1350 | tmpport = ntohs(hdr.v2.addr.ip6.src_port); | |
e6d2a989 | 1351 | proxy_local_port = sender_host_port; |
eb57651e TL |
1352 | sender_host_port = tmpport; |
1353 | /* Save dest ip/port */ | |
1354 | memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.dst_addr, 16); | |
5d036699 JH |
1355 | inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6)); |
1356 | if (!string_is_ip_address(US tmpip6, NULL)) | |
eb57651e TL |
1357 | { |
1358 | DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype); | |
f267271d | 1359 | goto proxyfail; |
eb57651e | 1360 | } |
7a2fa0bc | 1361 | proxy_external_address = string_copy(US tmpip6); |
eb57651e | 1362 | tmpport = ntohs(hdr.v2.addr.ip6.dst_port); |
7a2fa0bc | 1363 | proxy_external_port = tmpport; |
a3c86431 | 1364 | goto done; |
eb57651e TL |
1365 | default: |
1366 | DEBUG(D_receive) | |
1367 | debug_printf("Unsupported PROXYv2 connection type: 0x%02x\n", | |
1368 | hdr.v2.fam); | |
1369 | goto proxyfail; | |
a3c86431 TL |
1370 | } |
1371 | /* Unsupported protocol, keep local connection address */ | |
1372 | break; | |
1373 | case 0x00: /* LOCAL command */ | |
1374 | /* Keep local connection address for LOCAL */ | |
9e7e0f6a | 1375 | iptype = US"local"; |
a3c86431 TL |
1376 | break; |
1377 | default: | |
eb57651e | 1378 | DEBUG(D_receive) |
36719342 | 1379 | debug_printf("Unsupported PROXYv2 command: 0x%x\n", cmd); |
a3c86431 TL |
1380 | goto proxyfail; |
1381 | } | |
1382 | } | |
5d036699 | 1383 | else if (ret >= 8 && memcmp(hdr.v1.line, "PROXY", 5) == 0) |
a3c86431 | 1384 | { |
3f251b3c PP |
1385 | uschar *p; |
1386 | uschar *end; | |
a3c86431 TL |
1387 | uschar *sp; /* Utility variables follow */ |
1388 | int tmp_port; | |
3f251b3c | 1389 | int r2; |
a3c86431 TL |
1390 | char *endc; |
1391 | ||
3f251b3c | 1392 | /* get the rest of the line */ |
da88acae | 1393 | r2 = swallow_until_crlf(fd, (uschar*)&hdr, ret, sizeof(hdr)-ret); |
3f251b3c PP |
1394 | if (r2 == -1) |
1395 | goto proxyfail; | |
1396 | ret += r2; | |
1397 | ||
1398 | p = string_copy(hdr.v1.line); | |
1399 | end = memchr(p, '\r', ret - 1); | |
1400 | ||
da88acae | 1401 | if (!end || (end == (uschar*)&hdr + ret) || end[1] != '\n') |
a3c86431 TL |
1402 | { |
1403 | DEBUG(D_receive) debug_printf("Partial or invalid PROXY header\n"); | |
1404 | goto proxyfail; | |
1405 | } | |
1406 | *end = '\0'; /* Terminate the string */ | |
a5d4db40 | 1407 | size = end + 2 - p; /* Skip header + CRLF */ |
a3c86431 | 1408 | DEBUG(D_receive) debug_printf("Detected PROXYv1 header\n"); |
3f251b3c | 1409 | DEBUG(D_receive) debug_printf("Bytes read not within PROXY header: %d\n", ret - size); |
a3c86431 | 1410 | /* Step through the string looking for the required fields. Ensure |
2c0f3ea1 | 1411 | strict adherence to required formatting, exit for any error. */ |
a3c86431 TL |
1412 | p += 5; |
1413 | if (!isspace(*(p++))) | |
1414 | { | |
1415 | DEBUG(D_receive) debug_printf("Missing space after PROXY command\n"); | |
1416 | goto proxyfail; | |
1417 | } | |
1418 | if (!Ustrncmp(p, CCS"TCP4", 4)) | |
1419 | iptype = US"IPv4"; | |
1420 | else if (!Ustrncmp(p,CCS"TCP6", 4)) | |
1421 | iptype = US"IPv6"; | |
1422 | else if (!Ustrncmp(p,CCS"UNKNOWN", 7)) | |
1423 | { | |
1424 | iptype = US"Unknown"; | |
1425 | goto done; | |
1426 | } | |
1427 | else | |
1428 | { | |
1429 | DEBUG(D_receive) debug_printf("Invalid TCP type\n"); | |
1430 | goto proxyfail; | |
1431 | } | |
1432 | ||
1433 | p += Ustrlen(iptype); | |
1434 | if (!isspace(*(p++))) | |
1435 | { | |
1436 | DEBUG(D_receive) debug_printf("Missing space after TCP4/6 command\n"); | |
1437 | goto proxyfail; | |
1438 | } | |
1439 | /* Find the end of the arg */ | |
1440 | if ((sp = Ustrchr(p, ' ')) == NULL) | |
1441 | { | |
1442 | DEBUG(D_receive) | |
1443 | debug_printf("Did not find proxied src %s\n", iptype); | |
1444 | goto proxyfail; | |
1445 | } | |
1446 | *sp = '\0'; | |
5d036699 | 1447 | if(!string_is_ip_address(p, NULL)) |
a3c86431 TL |
1448 | { |
1449 | DEBUG(D_receive) | |
1450 | debug_printf("Proxied src arg is not an %s address\n", iptype); | |
1451 | goto proxyfail; | |
1452 | } | |
e6d2a989 | 1453 | proxy_local_address = sender_host_address; |
a3c86431 TL |
1454 | sender_host_address = p; |
1455 | p = sp + 1; | |
1456 | if ((sp = Ustrchr(p, ' ')) == NULL) | |
1457 | { | |
1458 | DEBUG(D_receive) | |
1459 | debug_printf("Did not find proxy dest %s\n", iptype); | |
1460 | goto proxyfail; | |
1461 | } | |
1462 | *sp = '\0'; | |
5d036699 | 1463 | if(!string_is_ip_address(p, NULL)) |
a3c86431 TL |
1464 | { |
1465 | DEBUG(D_receive) | |
1466 | debug_printf("Proxy dest arg is not an %s address\n", iptype); | |
1467 | goto proxyfail; | |
1468 | } | |
7a2fa0bc | 1469 | proxy_external_address = p; |
a3c86431 TL |
1470 | p = sp + 1; |
1471 | if ((sp = Ustrchr(p, ' ')) == NULL) | |
1472 | { | |
1473 | DEBUG(D_receive) debug_printf("Did not find proxied src port\n"); | |
1474 | goto proxyfail; | |
1475 | } | |
1476 | *sp = '\0'; | |
5d036699 | 1477 | tmp_port = strtol(CCS p, &endc, 10); |
a3c86431 TL |
1478 | if (*endc || tmp_port == 0) |
1479 | { | |
1480 | DEBUG(D_receive) | |
1481 | debug_printf("Proxied src port '%s' not an integer\n", p); | |
1482 | goto proxyfail; | |
1483 | } | |
e6d2a989 | 1484 | proxy_local_port = sender_host_port; |
a3c86431 TL |
1485 | sender_host_port = tmp_port; |
1486 | p = sp + 1; | |
1487 | if ((sp = Ustrchr(p, '\0')) == NULL) | |
1488 | { | |
1489 | DEBUG(D_receive) debug_printf("Did not find proxy dest port\n"); | |
1490 | goto proxyfail; | |
1491 | } | |
5d036699 | 1492 | tmp_port = strtol(CCS p, &endc, 10); |
a3c86431 TL |
1493 | if (*endc || tmp_port == 0) |
1494 | { | |
1495 | DEBUG(D_receive) | |
1496 | debug_printf("Proxy dest port '%s' not an integer\n", p); | |
1497 | goto proxyfail; | |
1498 | } | |
7a2fa0bc | 1499 | proxy_external_port = tmp_port; |
a3c86431 | 1500 | /* Already checked for /r /n above. Good V1 header received. */ |
a3c86431 TL |
1501 | } |
1502 | else | |
1503 | { | |
1504 | /* Wrong protocol */ | |
eb57651e | 1505 | DEBUG(D_receive) debug_printf("Invalid proxy protocol version negotiation\n"); |
da88acae | 1506 | (void) swallow_until_crlf(fd, (uschar*)&hdr, ret, sizeof(hdr)-ret); |
a3c86431 TL |
1507 | goto proxyfail; |
1508 | } | |
1509 | ||
1811cb4c JH |
1510 | done: |
1511 | DEBUG(D_receive) | |
1512 | debug_printf("Valid %s sender from Proxy Protocol header\n", iptype); | |
1513 | yield = proxy_session; | |
1514 | ||
1515 | /* Don't flush any potential buffer contents. Any input on proxyfail | |
1516 | should cause a synchronization failure */ | |
1517 | ||
a3c86431 | 1518 | proxyfail: |
1811cb4c | 1519 | restore_socket_timeout(fd, get_ok, &tvtmp, vslen); |
a3c86431 | 1520 | |
1811cb4c JH |
1521 | bad: |
1522 | if (yield) | |
1523 | { | |
1524 | sender_host_name = NULL; | |
1525 | (void) host_name_lookup(); | |
1526 | host_build_sender_fullhost(); | |
1527 | } | |
1528 | else | |
1529 | { | |
8768d548 | 1530 | f.proxy_session_failed = TRUE; |
1811cb4c JH |
1531 | DEBUG(D_receive) |
1532 | debug_printf("Failure to extract proxied host, only QUIT allowed\n"); | |
1533 | } | |
1534 | ||
1535 | return; | |
a3c86431 TL |
1536 | } |
1537 | #endif | |
1538 | ||
059ec3d9 PH |
1539 | /************************************************* |
1540 | * Read one command line * | |
1541 | *************************************************/ | |
1542 | ||
1543 | /* Strictly, SMTP commands coming over the net are supposed to end with CRLF. | |
1544 | There are sites that don't do this, and in any case internal SMTP probably | |
1545 | should check only for LF. Consequently, we check here for LF only. The line | |
1546 | ends up with [CR]LF removed from its end. If we get an overlong line, treat as | |
3ee512ff PH |
1547 | an unknown command. The command is read into the global smtp_cmd_buffer so that |
1548 | it is available via $smtp_command. | |
059ec3d9 PH |
1549 | |
1550 | The character reading routine sets up a timeout for each block actually read | |
1551 | from the input (which may contain more than one command). We set up a special | |
1552 | signal handler that closes down the session on a timeout. Control does not | |
1553 | return when it runs. | |
1554 | ||
1555 | Arguments: | |
bd8fbe36 JH |
1556 | check_sync if TRUE, check synchronization rules if global option is TRUE |
1557 | buffer_lim maximum to buffer in lower layer | |
059ec3d9 PH |
1558 | |
1559 | Returns: a code identifying the command (enumerated above) | |
1560 | */ | |
1561 | ||
1562 | static int | |
bd8fbe36 | 1563 | smtp_read_command(BOOL check_sync, unsigned buffer_lim) |
059ec3d9 PH |
1564 | { |
1565 | int c; | |
1566 | int ptr = 0; | |
1567 | smtp_cmd_list *p; | |
1568 | BOOL hadnull = FALSE; | |
1569 | ||
9723f966 | 1570 | had_command_timeout = 0; |
059ec3d9 PH |
1571 | os_non_restarting_signal(SIGALRM, command_timeout_handler); |
1572 | ||
bd8fbe36 | 1573 | while ((c = (receive_getc)(buffer_lim)) != '\n' && c != EOF) |
059ec3d9 | 1574 | { |
bd8fbe36 | 1575 | if (ptr >= SMTP_CMD_BUFFER_SIZE) |
059ec3d9 PH |
1576 | { |
1577 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
1578 | return OTHER_CMD; | |
1579 | } | |
1580 | if (c == 0) | |
1581 | { | |
1582 | hadnull = TRUE; | |
1583 | c = '?'; | |
1584 | } | |
3ee512ff | 1585 | smtp_cmd_buffer[ptr++] = c; |
059ec3d9 PH |
1586 | } |
1587 | ||
1588 | receive_linecount++; /* For BSMTP errors */ | |
1589 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
1590 | ||
1591 | /* If hit end of file, return pseudo EOF command. Whether we have a | |
1592 | part-line already read doesn't matter, since this is an error state. */ | |
1593 | ||
1594 | if (c == EOF) return EOF_CMD; | |
1595 | ||
1596 | /* Remove any CR and white space at the end of the line, and terminate the | |
1597 | string. */ | |
1598 | ||
3ee512ff PH |
1599 | while (ptr > 0 && isspace(smtp_cmd_buffer[ptr-1])) ptr--; |
1600 | smtp_cmd_buffer[ptr] = 0; | |
059ec3d9 | 1601 | |
3ee512ff | 1602 | DEBUG(D_receive) debug_printf("SMTP<< %s\n", smtp_cmd_buffer); |
059ec3d9 PH |
1603 | |
1604 | /* NULLs are not allowed in SMTP commands */ | |
1605 | ||
1606 | if (hadnull) return BADCHAR_CMD; | |
1607 | ||
1608 | /* Scan command list and return identity, having set the data pointer | |
1609 | to the start of the actual data characters. Check for SMTP synchronization | |
1610 | if required. */ | |
1611 | ||
1612 | for (p = cmd_list; p < cmd_list_end; p++) | |
1613 | { | |
1811cb4c | 1614 | #ifdef SUPPORT_PROXY |
a3c86431 | 1615 | /* Only allow QUIT command if Proxy Protocol parsing failed */ |
8768d548 | 1616 | if (proxy_session && f.proxy_session_failed && p->cmd != QUIT_CMD) |
1811cb4c JH |
1617 | continue; |
1618 | #endif | |
2f460950 JH |
1619 | if ( p->len |
1620 | && strncmpic(smtp_cmd_buffer, US p->name, p->len) == 0 | |
1621 | && ( smtp_cmd_buffer[p->len-1] == ':' /* "mail from:" or "rcpt to:" */ | |
1622 | || smtp_cmd_buffer[p->len] == 0 | |
1623 | || smtp_cmd_buffer[p->len] == ' ' | |
1624 | ) ) | |
059ec3d9 PH |
1625 | { |
1626 | if (smtp_inptr < smtp_inend && /* Outstanding input */ | |
1627 | p->cmd < sync_cmd_limit && /* Command should sync */ | |
1628 | check_sync && /* Local flag set */ | |
1629 | smtp_enforce_sync && /* Global flag set */ | |
1630 | sender_host_address != NULL && /* Not local input */ | |
8768d548 | 1631 | !f.sender_host_notsocket) /* Really is a socket */ |
059ec3d9 PH |
1632 | return BADSYN_CMD; |
1633 | ||
ca86f471 PH |
1634 | /* The variables $smtp_command and $smtp_command_argument point into the |
1635 | unmodified input buffer. A copy of the latter is taken for actual | |
1636 | processing, so that it can be chopped up into separate parts if necessary, | |
1637 | for example, when processing a MAIL command options such as SIZE that can | |
1638 | follow the sender address. */ | |
059ec3d9 | 1639 | |
3ee512ff | 1640 | smtp_cmd_argument = smtp_cmd_buffer + p->len; |
ca86f471 PH |
1641 | while (isspace(*smtp_cmd_argument)) smtp_cmd_argument++; |
1642 | Ustrcpy(smtp_data_buffer, smtp_cmd_argument); | |
1643 | smtp_cmd_data = smtp_data_buffer; | |
059ec3d9 PH |
1644 | |
1645 | /* Count non-mail commands from those hosts that are controlled in this | |
1646 | way. The default is all hosts. We don't waste effort checking the list | |
1647 | until we get a non-mail command, but then cache the result to save checking | |
1648 | again. If there's a DEFER while checking the host, assume it's in the list. | |
1649 | ||
1650 | Note that one instance of RSET, EHLO/HELO, and STARTTLS is allowed at the | |
1651 | start of each incoming message by fiddling with the value in the table. */ | |
1652 | ||
1653 | if (!p->is_mail_cmd) | |
1654 | { | |
1655 | if (count_nonmail == TRUE_UNSET) count_nonmail = | |
1656 | verify_check_host(&smtp_accept_max_nonmail_hosts) != FAIL; | |
1657 | if (count_nonmail && ++nonmail_command_count > smtp_accept_max_nonmail) | |
1658 | return TOO_MANY_NONMAIL_CMD; | |
1659 | } | |
1660 | ||
ca86f471 PH |
1661 | /* If there is data for a command that does not expect it, generate the |
1662 | error here. */ | |
059ec3d9 | 1663 | |
ca86f471 | 1664 | return (p->has_arg || *smtp_cmd_data == 0)? p->cmd : BADARG_CMD; |
059ec3d9 PH |
1665 | } |
1666 | } | |
1667 | ||
cee5f132 | 1668 | #ifdef SUPPORT_PROXY |
a3c86431 | 1669 | /* Only allow QUIT command if Proxy Protocol parsing failed */ |
8768d548 | 1670 | if (proxy_session && f.proxy_session_failed) |
a3c86431 TL |
1671 | return PROXY_FAIL_IGNORE_CMD; |
1672 | #endif | |
1673 | ||
059ec3d9 PH |
1674 | /* Enforce synchronization for unknown commands */ |
1675 | ||
ecce6d9a JH |
1676 | if ( smtp_inptr < smtp_inend /* Outstanding input */ |
1677 | && check_sync /* Local flag set */ | |
1678 | && smtp_enforce_sync /* Global flag set */ | |
1679 | && sender_host_address /* Not local input */ | |
8768d548 | 1680 | && !f.sender_host_notsocket) /* Really is a socket */ |
059ec3d9 PH |
1681 | return BADSYN_CMD; |
1682 | ||
1683 | return OTHER_CMD; | |
1684 | } | |
1685 | ||
1686 | ||
1687 | ||
1688 | /************************************************* | |
1689 | * Forced closedown of call * | |
1690 | *************************************************/ | |
1691 | ||
1692 | /* This function is called from log.c when Exim is dying because of a serious | |
1693 | disaster, and also from some other places. If an incoming non-batched SMTP | |
1694 | channel is open, it swallows the rest of the incoming message if in the DATA | |
1695 | phase, sends the reply string, and gives an error to all subsequent commands | |
1696 | except QUIT. The existence of an SMTP call is detected by the non-NULLness of | |
1697 | smtp_in. | |
1698 | ||
8f128379 PH |
1699 | Arguments: |
1700 | message SMTP reply string to send, excluding the code | |
1701 | ||
059ec3d9 PH |
1702 | Returns: nothing |
1703 | */ | |
1704 | ||
1705 | void | |
1706 | smtp_closedown(uschar *message) | |
1707 | { | |
db57e575 | 1708 | if (!smtp_in || smtp_batched_input) return; |
059ec3d9 | 1709 | receive_swallow_smtp(); |
925ac8e4 | 1710 | smtp_printf("421 %s\r\n", FALSE, message); |
059ec3d9 | 1711 | |
bd8fbe36 | 1712 | for (;;) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED)) |
059ec3d9 | 1713 | { |
60d10ce7 | 1714 | case EOF_CMD: |
db57e575 | 1715 | return; |
059ec3d9 | 1716 | |
60d10ce7 | 1717 | case QUIT_CMD: |
db57e575 JH |
1718 | smtp_printf("221 %s closing connection\r\n", FALSE, smtp_active_hostname); |
1719 | mac_smtp_fflush(); | |
1720 | return; | |
059ec3d9 | 1721 | |
60d10ce7 | 1722 | case RSET_CMD: |
db57e575 JH |
1723 | smtp_printf("250 Reset OK\r\n", FALSE); |
1724 | break; | |
059ec3d9 | 1725 | |
60d10ce7 | 1726 | default: |
db57e575 JH |
1727 | smtp_printf("421 %s\r\n", FALSE, message); |
1728 | break; | |
059ec3d9 PH |
1729 | } |
1730 | } | |
1731 | ||
1732 | ||
1733 | ||
1734 | ||
1735 | /************************************************* | |
1736 | * Set up connection info for logging * | |
1737 | *************************************************/ | |
1738 | ||
1739 | /* This function is called when logging information about an SMTP connection. | |
1740 | It sets up appropriate source information, depending on the type of connection. | |
dac79d3e PH |
1741 | If sender_fullhost is NULL, we are at a very early stage of the connection; |
1742 | just use the IP address. | |
059ec3d9 PH |
1743 | |
1744 | Argument: none | |
1745 | Returns: a string describing the connection | |
1746 | */ | |
1747 | ||
1748 | uschar * | |
1749 | smtp_get_connection_info(void) | |
1750 | { | |
f5d25c2b JH |
1751 | const uschar * hostname = sender_fullhost |
1752 | ? sender_fullhost : sender_host_address; | |
dac79d3e | 1753 | |
059ec3d9 | 1754 | if (host_checking) |
dac79d3e | 1755 | return string_sprintf("SMTP connection from %s", hostname); |
059ec3d9 | 1756 | |
8768d548 | 1757 | if (f.sender_host_unknown || f.sender_host_notsocket) |
059ec3d9 PH |
1758 | return string_sprintf("SMTP connection from %s", sender_ident); |
1759 | ||
8768d548 | 1760 | if (f.is_inetd) |
dac79d3e | 1761 | return string_sprintf("SMTP connection from %s (via inetd)", hostname); |
059ec3d9 | 1762 | |
6c6d6e48 | 1763 | if (LOGGING(incoming_interface) && interface_address != NULL) |
dac79d3e | 1764 | return string_sprintf("SMTP connection from %s I=[%s]:%d", hostname, |
059ec3d9 PH |
1765 | interface_address, interface_port); |
1766 | ||
dac79d3e | 1767 | return string_sprintf("SMTP connection from %s", hostname); |
059ec3d9 PH |
1768 | } |
1769 | ||
1770 | ||
1771 | ||
e45a1c37 | 1772 | #ifdef SUPPORT_TLS |
887291d2 JH |
1773 | /* Append TLS-related information to a log line |
1774 | ||
1775 | Arguments: | |
acec9514 | 1776 | g String under construction: allocated string to extend, or NULL |
887291d2 JH |
1777 | |
1778 | Returns: Allocated string or NULL | |
1779 | */ | |
acec9514 JH |
1780 | static gstring * |
1781 | s_tlslog(gstring * g) | |
e45a1c37 | 1782 | { |
acec9514 JH |
1783 | if (LOGGING(tls_cipher) && tls_in.cipher) |
1784 | g = string_append(g, 2, US" X=", tls_in.cipher); | |
1785 | if (LOGGING(tls_certificate_verified) && tls_in.cipher) | |
1786 | g = string_append(g, 2, US" CV=", tls_in.certificate_verified? "yes":"no"); | |
1787 | if (LOGGING(tls_peerdn) && tls_in.peerdn) | |
1788 | g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\""); | |
1789 | if (LOGGING(tls_sni) && tls_in.sni) | |
1790 | g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\""); | |
1791 | return g; | |
e45a1c37 JH |
1792 | } |
1793 | #endif | |
1794 | ||
b4ed4da0 PH |
1795 | /************************************************* |
1796 | * Log lack of MAIL if so configured * | |
1797 | *************************************************/ | |
1798 | ||
1799 | /* This function is called when an SMTP session ends. If the log selector | |
1800 | smtp_no_mail is set, write a log line giving some details of what has happened | |
1801 | in the SMTP session. | |
1802 | ||
1803 | Arguments: none | |
1804 | Returns: nothing | |
1805 | */ | |
1806 | ||
1807 | void | |
1808 | smtp_log_no_mail(void) | |
1809 | { | |
acec9514 JH |
1810 | int i; |
1811 | uschar * sep, * s; | |
1812 | gstring * g = NULL; | |
b4ed4da0 | 1813 | |
6c6d6e48 | 1814 | if (smtp_mailcmd_count > 0 || !LOGGING(smtp_no_mail)) |
b4ed4da0 PH |
1815 | return; |
1816 | ||
db57e575 | 1817 | if (sender_host_authenticated) |
b4ed4da0 | 1818 | { |
acec9514 JH |
1819 | g = string_append(g, 2, US" A=", sender_host_authenticated); |
1820 | if (authenticated_id) g = string_append(g, 2, US":", authenticated_id); | |
b4ed4da0 PH |
1821 | } |
1822 | ||
1823 | #ifdef SUPPORT_TLS | |
acec9514 | 1824 | g = s_tlslog(g); |
3f0945ff | 1825 | #endif |
b4ed4da0 | 1826 | |
acec9514 JH |
1827 | sep = smtp_connection_had[SMTP_HBUFF_SIZE-1] != SCH_NONE ? US" C=..." : US" C="; |
1828 | ||
b4ed4da0 | 1829 | for (i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++) |
b4ed4da0 PH |
1830 | if (smtp_connection_had[i] != SCH_NONE) |
1831 | { | |
acec9514 | 1832 | g = string_append(g, 2, sep, smtp_names[smtp_connection_had[i]]); |
b4ed4da0 PH |
1833 | sep = US","; |
1834 | } | |
b4ed4da0 PH |
1835 | |
1836 | for (i = 0; i < smtp_ch_index; i++) | |
1837 | { | |
acec9514 | 1838 | g = string_append(g, 2, sep, smtp_names[smtp_connection_had[i]]); |
b4ed4da0 PH |
1839 | sep = US","; |
1840 | } | |
1841 | ||
acec9514 JH |
1842 | if (!(s = string_from_gstring(g))) s = US""; |
1843 | ||
a2673768 | 1844 | log_write(0, LOG_MAIN, "no MAIL in %sSMTP connection from %s D=%s%s", |
8768d548 | 1845 | f.tcp_in_fastopen ? US"TFO " : US"", |
0f1a8658 | 1846 | host_and_ident(FALSE), string_timesince(&smtp_connection_start), s); |
b4ed4da0 PH |
1847 | } |
1848 | ||
1849 | ||
a09f2942 JH |
1850 | /* Return list of recent smtp commands */ |
1851 | ||
1852 | uschar * | |
1853 | smtp_cmd_hist(void) | |
1854 | { | |
acec9514 JH |
1855 | int i; |
1856 | gstring * list = NULL; | |
1857 | uschar * s; | |
a09f2942 JH |
1858 | |
1859 | for (i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++) | |
1860 | if (smtp_connection_had[i] != SCH_NONE) | |
acec9514 JH |
1861 | list = string_append_listele(list, ',', smtp_names[smtp_connection_had[i]]); |
1862 | ||
a09f2942 | 1863 | for (i = 0; i < smtp_ch_index; i++) |
acec9514 JH |
1864 | list = string_append_listele(list, ',', smtp_names[smtp_connection_had[i]]); |
1865 | ||
1866 | s = string_from_gstring(list); | |
1867 | return s ? s : US""; | |
a09f2942 JH |
1868 | } |
1869 | ||
1870 | ||
1871 | ||
b4ed4da0 | 1872 | |
059ec3d9 PH |
1873 | /************************************************* |
1874 | * Check HELO line and set sender_helo_name * | |
1875 | *************************************************/ | |
1876 | ||
1877 | /* Check the format of a HELO line. The data for HELO/EHLO is supposed to be | |
1878 | the domain name of the sending host, or an ip literal in square brackets. The | |
4c04137d | 1879 | argument is placed in sender_helo_name, which is in malloc store, because it |
059ec3d9 PH |
1880 | must persist over multiple incoming messages. If helo_accept_junk is set, this |
1881 | host is permitted to send any old junk (needed for some broken hosts). | |
1882 | Otherwise, helo_allow_chars can be used for rogue characters in general | |
1883 | (typically people want to let in underscores). | |
1884 | ||
1885 | Argument: | |
1886 | s the data portion of the line (already past any white space) | |
1887 | ||
1888 | Returns: TRUE or FALSE | |
1889 | */ | |
1890 | ||
1891 | static BOOL | |
1892 | check_helo(uschar *s) | |
1893 | { | |
1894 | uschar *start = s; | |
1895 | uschar *end = s + Ustrlen(s); | |
88752192 | 1896 | BOOL yield = fl.helo_accept_junk; |
059ec3d9 PH |
1897 | |
1898 | /* Discard any previous helo name */ | |
1899 | ||
2d0dc929 | 1900 | if (sender_helo_name) |
059ec3d9 PH |
1901 | { |
1902 | store_free(sender_helo_name); | |
1903 | sender_helo_name = NULL; | |
1904 | } | |
1905 | ||
1906 | /* Skip tests if junk is permitted. */ | |
1907 | ||
1908 | if (!yield) | |
db57e575 | 1909 | |
059ec3d9 PH |
1910 | /* Allow the new standard form for IPv6 address literals, namely, |
1911 | [IPv6:....], and because someone is bound to use it, allow an equivalent | |
1912 | IPv4 form. Allow plain addresses as well. */ | |
1913 | ||
1914 | if (*s == '[') | |
1915 | { | |
1916 | if (end[-1] == ']') | |
1917 | { | |
1918 | end[-1] = 0; | |
1919 | if (strncmpic(s, US"[IPv6:", 6) == 0) | |
1920 | yield = (string_is_ip_address(s+6, NULL) == 6); | |
1921 | else if (strncmpic(s, US"[IPv4:", 6) == 0) | |
1922 | yield = (string_is_ip_address(s+6, NULL) == 4); | |
1923 | else | |
1924 | yield = (string_is_ip_address(s+1, NULL) != 0); | |
1925 | end[-1] = ']'; | |
1926 | } | |
1927 | } | |
1928 | ||
1929 | /* Non-literals must be alpha, dot, hyphen, plus any non-valid chars | |
1930 | that have been configured (usually underscore - sigh). */ | |
1931 | ||
db57e575 JH |
1932 | else if (*s) |
1933 | for (yield = TRUE; *s; s++) | |
059ec3d9 PH |
1934 | if (!isalnum(*s) && *s != '.' && *s != '-' && |
1935 | Ustrchr(helo_allow_chars, *s) == NULL) | |
1936 | { | |
1937 | yield = FALSE; | |
1938 | break; | |
1939 | } | |
059ec3d9 PH |
1940 | |
1941 | /* Save argument if OK */ | |
1942 | ||
1943 | if (yield) sender_helo_name = string_copy_malloc(start); | |
1944 | return yield; | |
1945 | } | |
1946 | ||
1947 | ||
1948 | ||
1949 | ||
1950 | ||
1951 | /************************************************* | |
1952 | * Extract SMTP command option * | |
1953 | *************************************************/ | |
1954 | ||
ca86f471 | 1955 | /* This function picks the next option setting off the end of smtp_cmd_data. It |
059ec3d9 PH |
1956 | is called for MAIL FROM and RCPT TO commands, to pick off the optional ESMTP |
1957 | things that can appear there. | |
1958 | ||
1959 | Arguments: | |
1960 | name point this at the name | |
1961 | value point this at the data string | |
1962 | ||
1963 | Returns: TRUE if found an option | |
1964 | */ | |
1965 | ||
1966 | static BOOL | |
1967 | extract_option(uschar **name, uschar **value) | |
1968 | { | |
1969 | uschar *n; | |
ca86f471 | 1970 | uschar *v = smtp_cmd_data + Ustrlen(smtp_cmd_data) - 1; |
059ec3d9 PH |
1971 | while (isspace(*v)) v--; |
1972 | v[1] = 0; | |
d7a2c833 JH |
1973 | while (v > smtp_cmd_data && *v != '=' && !isspace(*v)) |
1974 | { | |
1975 | /* Take care to not stop at a space embedded in a quoted local-part */ | |
1976 | ||
1977 | if (*v == '"') do v--; while (*v != '"' && v > smtp_cmd_data+1); | |
1978 | v--; | |
1979 | } | |
059ec3d9 PH |
1980 | |
1981 | n = v; | |
fd98a5c6 | 1982 | if (*v == '=') |
a2673768 | 1983 | { |
fd98a5c6 JH |
1984 | while(isalpha(n[-1])) n--; |
1985 | /* RFC says SP, but TAB seen in wild and other major MTAs accept it */ | |
1986 | if (!isspace(n[-1])) return FALSE; | |
1987 | n[-1] = 0; | |
a2673768 | 1988 | } |
fd98a5c6 | 1989 | else |
a2673768 | 1990 | { |
fd98a5c6 JH |
1991 | n++; |
1992 | if (v == smtp_cmd_data) return FALSE; | |
a2673768 | 1993 | } |
059ec3d9 | 1994 | *v++ = 0; |
fd98a5c6 | 1995 | *name = n; |
059ec3d9 PH |
1996 | *value = v; |
1997 | return TRUE; | |
1998 | } | |
1999 | ||
2000 | ||
2001 | ||
2002 | ||
2003 | ||
059ec3d9 PH |
2004 | /************************************************* |
2005 | * Reset for new message * | |
2006 | *************************************************/ | |
2007 | ||
2008 | /* This function is called whenever the SMTP session is reset from | |
e04bfa34 | 2009 | within either of the setup functions; also from the daemon loop. |
059ec3d9 PH |
2010 | |
2011 | Argument: the stacking pool storage reset point | |
2012 | Returns: nothing | |
2013 | */ | |
2014 | ||
e04bfa34 | 2015 | void |
059ec3d9 PH |
2016 | smtp_reset(void *reset_point) |
2017 | { | |
059ec3d9 PH |
2018 | recipients_list = NULL; |
2019 | rcpt_count = rcpt_defer_count = rcpt_fail_count = | |
2020 | raw_recipients_count = recipients_count = recipients_list_max = 0; | |
2e0c1448 | 2021 | message_linecount = 0; |
059ec3d9 | 2022 | message_size = -1; |
71fafd95 | 2023 | acl_added_headers = NULL; |
e7568d51 | 2024 | acl_removed_headers = NULL; |
8768d548 | 2025 | f.queue_only_policy = FALSE; |
2679d413 | 2026 | rcpt_smtp_response = NULL; |
88752192 JH |
2027 | fl.rcpt_smtp_response_same = TRUE; |
2028 | fl.rcpt_in_progress = FALSE; | |
8768d548 | 2029 | f.deliver_freeze = FALSE; /* Can be set by ACL */ |
6a3f1455 | 2030 | freeze_tell = freeze_tell_config; /* Can be set by ACL */ |
29aba418 | 2031 | fake_response = OK; /* Can be set by ACL */ |
6951ac6c | 2032 | #ifdef WITH_CONTENT_SCAN |
8768d548 | 2033 | f.no_mbox_unspool = FALSE; /* Can be set by ACL */ |
8523533c | 2034 | #endif |
8768d548 JH |
2035 | f.submission_mode = FALSE; /* Can be set by ACL */ |
2036 | f.suppress_local_fixups = f.suppress_local_fixups_default; /* Can be set by ACL */ | |
2037 | f.active_local_from_check = local_from_check; /* Can be set by ACL */ | |
2038 | f.active_local_sender_retain = local_sender_retain; /* Can be set by ACL */ | |
90341c71 JH |
2039 | sending_ip_address = NULL; |
2040 | return_path = sender_address = NULL; | |
2041 | sender_data = NULL; /* Can be set by ACL */ | |
c679ee08 JH |
2042 | deliver_localpart_parent = deliver_localpart_orig = NULL; |
2043 | deliver_domain_parent = deliver_domain_orig = NULL; | |
90341c71 | 2044 | callout_address = NULL; |
2fe1a124 | 2045 | submission_name = NULL; /* Can be set by ACL */ |
059ec3d9 PH |
2046 | raw_sender = NULL; /* After SMTP rewrite, before qualifying */ |
2047 | sender_address_unrewritten = NULL; /* Set only after verify rewrite */ | |
2048 | sender_verified_list = NULL; /* No senders verified */ | |
2049 | memset(sender_address_cache, 0, sizeof(sender_address_cache)); | |
2050 | memset(sender_domain_cache, 0, sizeof(sender_domain_cache)); | |
6c1c3d1d | 2051 | |
059ec3d9 | 2052 | authenticated_sender = NULL; |
8523533c TK |
2053 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
2054 | bmi_run = 0; | |
2055 | bmi_verdicts = NULL; | |
2056 | #endif | |
90341c71 | 2057 | dnslist_domain = dnslist_matched = NULL; |
01067968 JH |
2058 | #ifdef SUPPORT_SPF |
2059 | spf_header_comment = spf_received = spf_result = spf_smtp_comment = NULL; | |
2060 | spf_result_guessed = FALSE; | |
2061 | #endif | |
80a47a2c | 2062 | #ifndef DISABLE_DKIM |
d342446f | 2063 | dkim_cur_signer = dkim_signers = |
b4757e36 | 2064 | dkim_signing_domain = dkim_signing_selector = dkim_signatures = NULL; |
d342446f | 2065 | dkim_cur_signer = dkim_signers = dkim_signing_domain = dkim_signing_selector = NULL; |
8768d548 | 2066 | f.dkim_disable_verify = FALSE; |
64b67b65 | 2067 | dkim_collect_input = 0; |
d342446f JH |
2068 | dkim_verify_overall = dkim_verify_status = dkim_verify_reason = NULL; |
2069 | dkim_key_length = 0; | |
2070 | dkim_verify_signers = US"$dkim_signers"; | |
f7572e5a | 2071 | #endif |
b4757e36 | 2072 | #ifdef EXPERIMENTAL_DMARC |
8768d548 | 2073 | f.dmarc_has_been_checked = f.dmarc_disable_verify = f.dmarc_enable_forensic = FALSE; |
8aeef98a | 2074 | dmarc_domain_policy = dmarc_status = dmarc_status_text = |
6372d4c9 | 2075 | dmarc_used_domain = NULL; |
f7572e5a | 2076 | #endif |
01067968 JH |
2077 | #ifdef EXPERIMENTAL_ARC |
2078 | arc_state = arc_state_reason = NULL; | |
b4757e36 | 2079 | #endif |
aa368db3 JH |
2080 | dsn_ret = 0; |
2081 | dsn_envid = NULL; | |
90341c71 | 2082 | deliver_host = deliver_host_address = NULL; /* Can be set by ACL */ |
aa368db3 JH |
2083 | #ifndef DISABLE_PRDR |
2084 | prdr_requested = FALSE; | |
2085 | #endif | |
8c5d388a | 2086 | #ifdef SUPPORT_I18N |
d1a13eea JH |
2087 | message_smtputf8 = FALSE; |
2088 | #endif | |
059ec3d9 PH |
2089 | body_linecount = body_zerocount = 0; |
2090 | ||
870f6ba8 TF |
2091 | sender_rate = sender_rate_limit = sender_rate_period = NULL; |
2092 | ratelimiters_mail = NULL; /* Updated by ratelimit ACL condition */ | |
2093 | /* Note that ratelimiters_conn persists across resets. */ | |
2094 | ||
38a0a95f | 2095 | /* Reset message ACL variables */ |
47ca6d6c | 2096 | |
38a0a95f | 2097 | acl_var_m = NULL; |
059ec3d9 PH |
2098 | |
2099 | /* The message body variables use malloc store. They may be set if this is | |
2100 | not the first message in an SMTP session and the previous message caused them | |
2101 | to be referenced in an ACL. */ | |
2102 | ||
90341c71 | 2103 | if (message_body) |
059ec3d9 PH |
2104 | { |
2105 | store_free(message_body); | |
2106 | message_body = NULL; | |
2107 | } | |
2108 | ||
90341c71 | 2109 | if (message_body_end) |
059ec3d9 PH |
2110 | { |
2111 | store_free(message_body_end); | |
2112 | message_body_end = NULL; | |
2113 | } | |
2114 | ||
2115 | /* Warning log messages are also saved in malloc store. They are saved to avoid | |
2116 | repetition in the same message, but it seems right to repeat them for different | |
4e88a19f | 2117 | messages. */ |
059ec3d9 | 2118 | |
90341c71 | 2119 | while (acl_warn_logged) |
059ec3d9 PH |
2120 | { |
2121 | string_item *this = acl_warn_logged; | |
2122 | acl_warn_logged = acl_warn_logged->next; | |
2123 | store_free(this); | |
2124 | } | |
90341c71 | 2125 | store_reset(reset_point); |
059ec3d9 PH |
2126 | } |
2127 | ||
2128 | ||
2129 | ||
2130 | ||
2131 | ||
2132 | /************************************************* | |
2133 | * Initialize for incoming batched SMTP message * | |
2134 | *************************************************/ | |
2135 | ||
2136 | /* This function is called from smtp_setup_msg() in the case when | |
2137 | smtp_batched_input is true. This happens when -bS is used to pass a whole batch | |
2138 | of messages in one file with SMTP commands between them. All errors must be | |
2139 | reported by sending a message, and only MAIL FROM, RCPT TO, and DATA are | |
2140 | relevant. After an error on a sender, or an invalid recipient, the remainder | |
2141 | of the message is skipped. The value of received_protocol is already set. | |
2142 | ||
2143 | Argument: none | |
2144 | Returns: > 0 message successfully started (reached DATA) | |
2145 | = 0 QUIT read or end of file reached | |
2146 | < 0 should not occur | |
2147 | */ | |
2148 | ||
2149 | static int | |
2150 | smtp_setup_batch_msg(void) | |
2151 | { | |
2152 | int done = 0; | |
2153 | void *reset_point = store_get(0); | |
2154 | ||
2155 | /* Save the line count at the start of each transaction - single commands | |
2156 | like HELO and RSET count as whole transactions. */ | |
2157 | ||
2158 | bsmtp_transaction_linecount = receive_linecount; | |
2159 | ||
2160 | if ((receive_feof)()) return 0; /* Treat EOF as QUIT */ | |
2161 | ||
57cc2785 | 2162 | cancel_cutthrough_connection(TRUE, US"smtp_setup_batch_msg"); |
059ec3d9 PH |
2163 | smtp_reset(reset_point); /* Reset for start of message */ |
2164 | ||
2165 | /* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE | |
2166 | value. The values are 2 larger than the required yield of the function. */ | |
2167 | ||
2168 | while (done <= 0) | |
2169 | { | |
2170 | uschar *errmess; | |
2171 | uschar *recipient = NULL; | |
2172 | int start, end, sender_domain, recipient_domain; | |
2173 | ||
bd8fbe36 | 2174 | switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED)) |
059ec3d9 PH |
2175 | { |
2176 | /* The HELO/EHLO commands set sender_address_helo if they have | |
2177 | valid data; otherwise they are ignored, except that they do | |
2178 | a reset of the state. */ | |
2179 | ||
2180 | case HELO_CMD: | |
2181 | case EHLO_CMD: | |
2182 | ||
db57e575 JH |
2183 | check_helo(smtp_cmd_data); |
2184 | /* Fall through */ | |
059ec3d9 PH |
2185 | |
2186 | case RSET_CMD: | |
db57e575 JH |
2187 | cancel_cutthrough_connection(TRUE, US"RSET received"); |
2188 | smtp_reset(reset_point); | |
2189 | bsmtp_transaction_linecount = receive_linecount; | |
2190 | break; | |
059ec3d9 PH |
2191 | |
2192 | ||
2193 | /* The MAIL FROM command requires an address as an operand. All we | |
2194 | do here is to parse it for syntactic correctness. The form "<>" is | |
2195 | a special case which converts into an empty string. The start/end | |
2196 | pointers in the original are not used further for this address, as | |
2197 | it is the canonical extracted address which is all that is kept. */ | |
2198 | ||
2199 | case MAIL_CMD: | |
db57e575 JH |
2200 | smtp_mailcmd_count++; /* Count for no-mail log */ |
2201 | if (sender_address != NULL) | |
2202 | /* The function moan_smtp_batch() does not return. */ | |
2203 | moan_smtp_batch(smtp_cmd_buffer, "503 Sender already given"); | |
059ec3d9 | 2204 | |
db57e575 JH |
2205 | if (smtp_cmd_data[0] == 0) |
2206 | /* The function moan_smtp_batch() does not return. */ | |
2207 | moan_smtp_batch(smtp_cmd_buffer, "501 MAIL FROM must have an address operand"); | |
059ec3d9 | 2208 | |
db57e575 | 2209 | /* Reset to start of message */ |
059ec3d9 | 2210 | |
db57e575 JH |
2211 | cancel_cutthrough_connection(TRUE, US"MAIL received"); |
2212 | smtp_reset(reset_point); | |
059ec3d9 | 2213 | |
db57e575 | 2214 | /* Apply SMTP rewrite */ |
059ec3d9 | 2215 | |
db57e575 JH |
2216 | raw_sender = ((rewrite_existflags & rewrite_smtp) != 0)? |
2217 | rewrite_one(smtp_cmd_data, rewrite_smtp|rewrite_smtp_sender, NULL, FALSE, | |
2218 | US"", global_rewrite_rules) : smtp_cmd_data; | |
059ec3d9 | 2219 | |
db57e575 | 2220 | /* Extract the address; the TRUE flag allows <> as valid */ |
059ec3d9 | 2221 | |
db57e575 JH |
2222 | raw_sender = |
2223 | parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain, | |
2224 | TRUE); | |
059ec3d9 | 2225 | |
db57e575 JH |
2226 | if (!raw_sender) |
2227 | /* The function moan_smtp_batch() does not return. */ | |
2228 | moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess); | |
059ec3d9 | 2229 | |
db57e575 | 2230 | sender_address = string_copy(raw_sender); |
059ec3d9 | 2231 | |
db57e575 | 2232 | /* Qualify unqualified sender addresses if permitted to do so. */ |
059ec3d9 | 2233 | |
db57e575 JH |
2234 | if ( !sender_domain |
2235 | && sender_address[0] != 0 && sender_address[0] != '@') | |
8768d548 | 2236 | if (f.allow_unqualified_sender) |
db57e575 JH |
2237 | { |
2238 | sender_address = rewrite_address_qualify(sender_address, FALSE); | |
2239 | DEBUG(D_receive) debug_printf("unqualified address %s accepted " | |
2240 | "and rewritten\n", raw_sender); | |
2241 | } | |
2242 | /* The function moan_smtp_batch() does not return. */ | |
2243 | else | |
2244 | moan_smtp_batch(smtp_cmd_buffer, "501 sender address must contain " | |
2245 | "a domain"); | |
2246 | break; | |
059ec3d9 PH |
2247 | |
2248 | ||
2249 | /* The RCPT TO command requires an address as an operand. All we do | |
2250 | here is to parse it for syntactic correctness. There may be any number | |
2251 | of RCPT TO commands, specifying multiple senders. We build them all into | |
2252 | a data structure that is in argc/argv format. The start/end values | |
2253 | given by parse_extract_address are not used, as we keep only the | |
2254 | extracted address. */ | |
2255 | ||
2256 | case RCPT_CMD: | |
db57e575 JH |
2257 | if (!sender_address) |
2258 | /* The function moan_smtp_batch() does not return. */ | |
2259 | moan_smtp_batch(smtp_cmd_buffer, "503 No sender yet given"); | |
059ec3d9 | 2260 | |
db57e575 JH |
2261 | if (smtp_cmd_data[0] == 0) |
2262 | /* The function moan_smtp_batch() does not return. */ | |
2263 | moan_smtp_batch(smtp_cmd_buffer, | |
2264 | "501 RCPT TO must have an address operand"); | |
059ec3d9 | 2265 | |
db57e575 | 2266 | /* Check maximum number allowed */ |
059ec3d9 | 2267 | |
db57e575 JH |
2268 | if (recipients_max > 0 && recipients_count + 1 > recipients_max) |
2269 | /* The function moan_smtp_batch() does not return. */ | |
2270 | moan_smtp_batch(smtp_cmd_buffer, "%s too many recipients", | |
2271 | recipients_max_reject? "552": "452"); | |
059ec3d9 | 2272 | |
db57e575 JH |
2273 | /* Apply SMTP rewrite, then extract address. Don't allow "<>" as a |
2274 | recipient address */ | |
059ec3d9 | 2275 | |
db57e575 JH |
2276 | recipient = rewrite_existflags & rewrite_smtp |
2277 | ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"", | |
2278 | global_rewrite_rules) | |
2279 | : smtp_cmd_data; | |
059ec3d9 | 2280 | |
db57e575 JH |
2281 | recipient = parse_extract_address(recipient, &errmess, &start, &end, |
2282 | &recipient_domain, FALSE); | |
059ec3d9 | 2283 | |
db57e575 JH |
2284 | if (!recipient) |
2285 | /* The function moan_smtp_batch() does not return. */ | |
2286 | moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess); | |
059ec3d9 | 2287 | |
db57e575 JH |
2288 | /* If the recipient address is unqualified, qualify it if permitted. Then |
2289 | add it to the list of recipients. */ | |
059ec3d9 | 2290 | |
db57e575 | 2291 | if (!recipient_domain) |
8768d548 | 2292 | if (f.allow_unqualified_recipient) |
db57e575 JH |
2293 | { |
2294 | DEBUG(D_receive) debug_printf("unqualified address %s accepted\n", | |
2295 | recipient); | |
2296 | recipient = rewrite_address_qualify(recipient, TRUE); | |
2297 | } | |
2298 | /* The function moan_smtp_batch() does not return. */ | |
2299 | else | |
2300 | moan_smtp_batch(smtp_cmd_buffer, | |
2301 | "501 recipient address must contain a domain"); | |
2302 | ||
2303 | receive_add_recipient(recipient, -1); | |
2304 | break; | |
059ec3d9 PH |
2305 | |
2306 | ||
2307 | /* The DATA command is legal only if it follows successful MAIL FROM | |
2308 | and RCPT TO commands. This function is complete when a valid DATA | |
2309 | command is encountered. */ | |
2310 | ||
2311 | case DATA_CMD: | |
db57e575 JH |
2312 | if (!sender_address || recipients_count <= 0) |
2313 | /* The function moan_smtp_batch() does not return. */ | |
2314 | if (!sender_address) | |
2315 | moan_smtp_batch(smtp_cmd_buffer, | |
2316 | "503 MAIL FROM:<sender> command must precede DATA"); | |
2317 | else | |
2318 | moan_smtp_batch(smtp_cmd_buffer, | |
2319 | "503 RCPT TO:<recipient> must precede DATA"); | |
059ec3d9 | 2320 | else |
db57e575 JH |
2321 | { |
2322 | done = 3; /* DATA successfully achieved */ | |
2323 | message_ended = END_NOTENDED; /* Indicate in middle of message */ | |
2324 | } | |
2325 | break; | |
059ec3d9 PH |
2326 | |
2327 | ||
2328 | /* The VRFY, EXPN, HELP, ETRN, and NOOP commands are ignored. */ | |
2329 | ||
2330 | case VRFY_CMD: | |
2331 | case EXPN_CMD: | |
2332 | case HELP_CMD: | |
2333 | case NOOP_CMD: | |
2334 | case ETRN_CMD: | |
db57e575 JH |
2335 | bsmtp_transaction_linecount = receive_linecount; |
2336 | break; | |
059ec3d9 PH |
2337 | |
2338 | ||
2339 | case EOF_CMD: | |
2340 | case QUIT_CMD: | |
db57e575 JH |
2341 | done = 2; |
2342 | break; | |
059ec3d9 PH |
2343 | |
2344 | ||
2345 | case BADARG_CMD: | |
db57e575 JH |
2346 | /* The function moan_smtp_batch() does not return. */ |
2347 | moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected argument data"); | |
2348 | break; | |
059ec3d9 PH |
2349 | |
2350 | ||
2351 | case BADCHAR_CMD: | |
db57e575 JH |
2352 | /* The function moan_smtp_batch() does not return. */ |
2353 | moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected NULL in SMTP command"); | |
2354 | break; | |
059ec3d9 PH |
2355 | |
2356 | ||
2357 | default: | |
db57e575 JH |
2358 | /* The function moan_smtp_batch() does not return. */ |
2359 | moan_smtp_batch(smtp_cmd_buffer, "500 Command unrecognized"); | |
2360 | break; | |
059ec3d9 PH |
2361 | } |
2362 | } | |
2363 | ||
2364 | return done - 2; /* Convert yield values */ | |
2365 | } | |
2366 | ||
2367 | ||
2368 | ||
2369 | ||
13c7874e | 2370 | #ifdef SUPPORT_TLS |
cf0c6164 JH |
2371 | static BOOL |
2372 | smtp_log_tls_fail(uschar * errstr) | |
2373 | { | |
2374 | uschar * conn_info = smtp_get_connection_info(); | |
2375 | ||
2376 | if (Ustrncmp(conn_info, US"SMTP ", 5) == 0) conn_info += 5; | |
2377 | /* I'd like to get separated H= here, but too hard for now */ | |
2378 | ||
2379 | log_write(0, LOG_MAIN, "TLS error on %s %s", conn_info, errstr); | |
2380 | return FALSE; | |
2381 | } | |
13c7874e | 2382 | #endif |
cf0c6164 JH |
2383 | |
2384 | ||
a2673768 JH |
2385 | |
2386 | ||
2387 | #ifdef TCP_FASTOPEN | |
2388 | static void | |
2389 | tfo_in_check(void) | |
2390 | { | |
2391 | # ifdef TCP_INFO | |
2392 | struct tcp_info tinfo; | |
2393 | socklen_t len = sizeof(tinfo); | |
2394 | ||
2395 | if ( getsockopt(fileno(smtp_out), IPPROTO_TCP, TCP_INFO, &tinfo, &len) == 0 | |
2396 | && tinfo.tcpi_state == TCP_SYN_RECV | |
2397 | ) | |
2398 | { | |
1ccd5f67 | 2399 | DEBUG(D_receive) debug_printf("TCP_FASTOPEN mode connection (state TCP_SYN_RECV)\n"); |
8768d548 | 2400 | f.tcp_in_fastopen = TRUE; |
a2673768 JH |
2401 | } |
2402 | # endif | |
2403 | } | |
2404 | #endif | |
2405 | ||
2406 | ||
059ec3d9 PH |
2407 | /************************************************* |
2408 | * Start an SMTP session * | |
2409 | *************************************************/ | |
2410 | ||
2411 | /* This function is called at the start of an SMTP session. Thereafter, | |
2412 | smtp_setup_msg() is called to initiate each separate message. This | |
2413 | function does host-specific testing, and outputs the banner line. | |
2414 | ||
2415 | Arguments: none | |
2416 | Returns: FALSE if the session can not continue; something has | |
2417 | gone wrong, or the connection to the host is blocked | |
2418 | */ | |
2419 | ||
2420 | BOOL | |
2421 | smtp_start_session(void) | |
2422 | { | |
acec9514 | 2423 | int esclen; |
4e88a19f PH |
2424 | uschar *user_msg, *log_msg; |
2425 | uschar *code, *esc; | |
acec9514 JH |
2426 | uschar *p, *s; |
2427 | gstring * ss; | |
059ec3d9 | 2428 | |
0f1a8658 | 2429 | gettimeofday(&smtp_connection_start, NULL); |
b4ed4da0 PH |
2430 | for (smtp_ch_index = 0; smtp_ch_index < SMTP_HBUFF_SIZE; smtp_ch_index++) |
2431 | smtp_connection_had[smtp_ch_index] = SCH_NONE; | |
2432 | smtp_ch_index = 0; | |
2433 | ||
00f00ca5 PH |
2434 | /* Default values for certain variables */ |
2435 | ||
88752192 | 2436 | fl.helo_seen = fl.esmtp = fl.helo_accept_junk = FALSE; |
b4ed4da0 | 2437 | smtp_mailcmd_count = 0; |
059ec3d9 PH |
2438 | count_nonmail = TRUE_UNSET; |
2439 | synprot_error_count = unknown_command_count = nonmail_command_count = 0; | |
2440 | smtp_delay_mail = smtp_rlm_base; | |
88752192 | 2441 | fl.auth_advertised = FALSE; |
8768d548 JH |
2442 | f.smtp_in_pipelining_advertised = f.smtp_in_pipelining_used = FALSE; |
2443 | f.pipelining_enable = TRUE; | |
059ec3d9 | 2444 | sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING; |
88752192 | 2445 | fl.smtp_exit_function_called = FALSE; /* For avoiding loop in not-quit exit */ |
059ec3d9 | 2446 | |
33d73e3b PH |
2447 | /* If receiving by -bs from a trusted user, or testing with -bh, we allow |
2448 | authentication settings from -oMaa to remain in force. */ | |
2449 | ||
8768d548 | 2450 | if (!host_checking && !f.sender_host_notsocket) |
c44ff8be | 2451 | sender_host_auth_pubname = sender_host_authenticated = NULL; |
059ec3d9 PH |
2452 | authenticated_by = NULL; |
2453 | ||
2454 | #ifdef SUPPORT_TLS | |
817d9f57 | 2455 | tls_in.cipher = tls_in.peerdn = NULL; |
9d1c15ef JH |
2456 | tls_in.ourcert = tls_in.peercert = NULL; |
2457 | tls_in.sni = NULL; | |
44662487 | 2458 | tls_in.ocsp = OCSP_NOT_REQ; |
88752192 | 2459 | fl.tls_advertised = FALSE; |
8ac90765 | 2460 | # ifdef EXPERIMENTAL_REQUIRETLS |
88752192 | 2461 | fl.requiretls_advertised = FALSE; |
8ac90765 | 2462 | # endif |
059ec3d9 | 2463 | #endif |
88752192 | 2464 | fl.dsn_advertised = FALSE; |
8c5d388a | 2465 | #ifdef SUPPORT_I18N |
88752192 | 2466 | fl.smtputf8_advertised = FALSE; |
d1a13eea | 2467 | #endif |
059ec3d9 PH |
2468 | |
2469 | /* Reset ACL connection variables */ | |
2470 | ||
38a0a95f | 2471 | acl_var_c = NULL; |
059ec3d9 | 2472 | |
ca86f471 | 2473 | /* Allow for trailing 0 in the command and data buffers. */ |
3ee512ff | 2474 | |
bd8fbe36 | 2475 | if (!(smtp_cmd_buffer = US malloc(2*SMTP_CMD_BUFFER_SIZE + 2))) |
059ec3d9 PH |
2476 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
2477 | "malloc() failed for SMTP command buffer"); | |
40c90bca | 2478 | |
2416c261 | 2479 | smtp_cmd_buffer[0] = 0; |
bd8fbe36 | 2480 | smtp_data_buffer = smtp_cmd_buffer + SMTP_CMD_BUFFER_SIZE + 1; |
059ec3d9 PH |
2481 | |
2482 | /* For batched input, the protocol setting can be overridden from the | |
2483 | command line by a trusted caller. */ | |
2484 | ||
2485 | if (smtp_batched_input) | |
2486 | { | |
40c90bca | 2487 | if (!received_protocol) received_protocol = US"local-bsmtp"; |
059ec3d9 PH |
2488 | } |
2489 | ||
2490 | /* For non-batched SMTP input, the protocol setting is forced here. It will be | |
2491 | reset later if any of EHLO/AUTH/STARTTLS are received. */ | |
2492 | ||
2493 | else | |
2494 | received_protocol = | |
e524074d | 2495 | (sender_host_address ? protocols : protocols_local) [pnormal]; |
059ec3d9 PH |
2496 | |
2497 | /* Set up the buffer for inputting using direct read() calls, and arrange to | |
ecce6d9a JH |
2498 | call the local functions instead of the standard C ones. Place a NUL at the |
2499 | end of the buffer to safety-stop C-string reads from it. */ | |
059ec3d9 | 2500 | |
5903c6ff | 2501 | if (!(smtp_inbuffer = US malloc(IN_BUFFER_SIZE))) |
059ec3d9 | 2502 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "malloc() failed for SMTP input buffer"); |
ecce6d9a | 2503 | smtp_inbuffer[IN_BUFFER_SIZE-1] = '\0'; |
40c90bca | 2504 | |
059ec3d9 | 2505 | receive_getc = smtp_getc; |
0d81dabc | 2506 | receive_getbuf = smtp_getbuf; |
584e96c6 | 2507 | receive_get_cache = smtp_get_cache; |
059ec3d9 PH |
2508 | receive_ungetc = smtp_ungetc; |
2509 | receive_feof = smtp_feof; | |
2510 | receive_ferror = smtp_ferror; | |
58eb016e | 2511 | receive_smtp_buffered = smtp_buffered; |
059ec3d9 PH |
2512 | smtp_inptr = smtp_inend = smtp_inbuffer; |
2513 | smtp_had_eof = smtp_had_error = 0; | |
2514 | ||
2515 | /* Set up the message size limit; this may be host-specific */ | |
2516 | ||
d45b1de8 | 2517 | thismessage_size_limit = expand_string_integer(message_size_limit, TRUE); |
db57e575 | 2518 | if (expand_string_message) |
059ec3d9 PH |
2519 | { |
2520 | if (thismessage_size_limit == -1) | |
2521 | log_write(0, LOG_MAIN|LOG_PANIC, "unable to expand message_size_limit: " | |
2522 | "%s", expand_string_message); | |
2523 | else | |
2524 | log_write(0, LOG_MAIN|LOG_PANIC, "invalid message_size_limit: " | |
2525 | "%s", expand_string_message); | |
2526 | smtp_closedown(US"Temporary local problem - please try later"); | |
2527 | return FALSE; | |
2528 | } | |
2529 | ||
2530 | /* When a message is input locally via the -bs or -bS options, sender_host_ | |
2531 | unknown is set unless -oMa was used to force an IP address, in which case it | |
2532 | is checked like a real remote connection. When -bs is used from inetd, this | |
2533 | flag is not set, causing the sending host to be checked. The code that deals | |
2534 | with IP source routing (if configured) is never required for -bs or -bS and | |
2535 | the flag sender_host_notsocket is used to suppress it. | |
2536 | ||
2537 | If smtp_accept_max and smtp_accept_reserve are set, keep some connections in | |
2538 | reserve for certain hosts and/or networks. */ | |
2539 | ||
8768d548 | 2540 | if (!f.sender_host_unknown) |
059ec3d9 PH |
2541 | { |
2542 | int rc; | |
2543 | BOOL reserved_host = FALSE; | |
2544 | ||
2545 | /* Look up IP options (source routing info) on the socket if this is not an | |
2546 | -oMa "host", and if any are found, log them and drop the connection. | |
2547 | ||
2548 | Linux (and others now, see below) is different to everyone else, so there | |
2549 | has to be some conditional compilation here. Versions of Linux before 2.1.15 | |
2550 | used a structure whose name was "options". Somebody finally realized that | |
2551 | this name was silly, and it got changed to "ip_options". I use the | |
2552 | newer name here, but there is a fudge in the script that sets up os.h | |
2553 | to define a macro in older Linux systems. | |
2554 | ||
2555 | Sigh. Linux is a fast-moving target. Another generation of Linux uses | |
2556 | glibc 2, which has chosen ip_opts for the structure name. This is now | |
2557 | really a glibc thing rather than a Linux thing, so the condition name | |
2558 | has been changed to reflect this. It is relevant also to GNU/Hurd. | |
2559 | ||
2560 | Mac OS 10.x (Darwin) is like the later glibc versions, but without the | |
2561 | setting of the __GLIBC__ macro, so we can't detect it automatically. There's | |
2562 | a special macro defined in the os.h file. | |
2563 | ||
2564 | Some DGUX versions on older hardware appear not to support IP options at | |
2565 | all, so there is now a general macro which can be set to cut out this | |
2566 | support altogether. | |
2567 | ||
2568 | How to do this properly in IPv6 is not yet known. */ | |
2569 | ||
e0574cb5 | 2570 | #if !HAVE_IPV6 && !defined(NO_IP_OPTIONS) |
059ec3d9 PH |
2571 | |
2572 | #ifdef GLIBC_IP_OPTIONS | |
2573 | #if (!defined __GLIBC__) || (__GLIBC__ < 2) | |
2574 | #define OPTSTYLE 1 | |
2575 | #else | |
2576 | #define OPTSTYLE 2 | |
2577 | #endif | |
2578 | #elif defined DARWIN_IP_OPTIONS | |
2579 | #define OPTSTYLE 2 | |
2580 | #else | |
2581 | #define OPTSTYLE 3 | |
2582 | #endif | |
2583 | ||
8768d548 | 2584 | if (!host_checking && !f.sender_host_notsocket) |
059ec3d9 PH |
2585 | { |
2586 | #if OPTSTYLE == 1 | |
36a3b041 | 2587 | EXIM_SOCKLEN_T optlen = sizeof(struct ip_options) + MAX_IPOPTLEN; |
059ec3d9 PH |
2588 | struct ip_options *ipopt = store_get(optlen); |
2589 | #elif OPTSTYLE == 2 | |
2590 | struct ip_opts ipoptblock; | |
2591 | struct ip_opts *ipopt = &ipoptblock; | |
36a3b041 | 2592 | EXIM_SOCKLEN_T optlen = sizeof(ipoptblock); |
059ec3d9 PH |
2593 | #else |
2594 | struct ipoption ipoptblock; | |
2595 | struct ipoption *ipopt = &ipoptblock; | |
36a3b041 | 2596 | EXIM_SOCKLEN_T optlen = sizeof(ipoptblock); |
059ec3d9 PH |
2597 | #endif |
2598 | ||
2599 | /* Occasional genuine failures of getsockopt() have been seen - for | |
2600 | example, "reset by peer". Therefore, just log and give up on this | |
2601 | call, unless the error is ENOPROTOOPT. This error is given by systems | |
2602 | that have the interfaces but not the mechanism - e.g. GNU/Hurd at the time | |
2603 | of writing. So for that error, carry on - we just can't do an IP options | |
2604 | check. */ | |
2605 | ||
2606 | DEBUG(D_receive) debug_printf("checking for IP options\n"); | |
2607 | ||
5903c6ff | 2608 | if (getsockopt(fileno(smtp_out), IPPROTO_IP, IP_OPTIONS, US (ipopt), |
059ec3d9 PH |
2609 | &optlen) < 0) |
2610 | { | |
2611 | if (errno != ENOPROTOOPT) | |
2612 | { | |
2613 | log_write(0, LOG_MAIN, "getsockopt() failed from %s: %s", | |
2614 | host_and_ident(FALSE), strerror(errno)); | |
925ac8e4 | 2615 | smtp_printf("451 SMTP service not available\r\n", FALSE); |
059ec3d9 PH |
2616 | return FALSE; |
2617 | } | |
2618 | } | |
2619 | ||
2620 | /* Deal with any IP options that are set. On the systems I have looked at, | |
2621 | the value of MAX_IPOPTLEN has been 40, meaning that there should never be | |
2622 | more logging data than will fit in big_buffer. Nevertheless, after somebody | |
2623 | questioned this code, I've added in some paranoid checking. */ | |
2624 | ||
2625 | else if (optlen > 0) | |
2626 | { | |
2627 | uschar *p = big_buffer; | |
2628 | uschar *pend = big_buffer + big_buffer_size; | |
2629 | uschar *opt, *adptr; | |
2630 | int optcount; | |
2631 | struct in_addr addr; | |
2632 | ||
2633 | #if OPTSTYLE == 1 | |
5903c6ff | 2634 | uschar *optstart = US (ipopt->__data); |
059ec3d9 | 2635 | #elif OPTSTYLE == 2 |
5903c6ff | 2636 | uschar *optstart = US (ipopt->ip_opts); |
059ec3d9 | 2637 | #else |
5903c6ff | 2638 | uschar *optstart = US (ipopt->ipopt_list); |
059ec3d9 PH |
2639 | #endif |
2640 | ||
2641 | DEBUG(D_receive) debug_printf("IP options exist\n"); | |
2642 | ||
2643 | Ustrcpy(p, "IP options on incoming call:"); | |
2644 | p += Ustrlen(p); | |
2645 | ||
2646 | for (opt = optstart; opt != NULL && | |
5903c6ff | 2647 | opt < US (ipopt) + optlen;) |
059ec3d9 PH |
2648 | { |
2649 | switch (*opt) | |
2650 | { | |
2651 | case IPOPT_EOL: | |
2652 | opt = NULL; | |
2653 | break; | |
2654 | ||
2655 | case IPOPT_NOP: | |
2656 | opt++; | |
2657 | break; | |
2658 | ||
2659 | case IPOPT_SSRR: | |
2660 | case IPOPT_LSRR: | |
2661 | if (!string_format(p, pend-p, " %s [@%s", | |
2662 | (*opt == IPOPT_SSRR)? "SSRR" : "LSRR", | |
2663 | #if OPTSTYLE == 1 | |
2664 | inet_ntoa(*((struct in_addr *)(&(ipopt->faddr)))))) | |
2665 | #elif OPTSTYLE == 2 | |
2666 | inet_ntoa(ipopt->ip_dst))) | |
2667 | #else | |
2668 | inet_ntoa(ipopt->ipopt_dst))) | |
2669 | #endif | |
2670 | { | |
2671 | opt = NULL; | |
2672 | break; | |
2673 | } | |
2674 | ||
2675 | p += Ustrlen(p); | |
2676 | optcount = (opt[1] - 3) / sizeof(struct in_addr); | |
2677 | adptr = opt + 3; | |
2678 | while (optcount-- > 0) | |
2679 | { | |
2680 | memcpy(&addr, adptr, sizeof(addr)); | |
2681 | if (!string_format(p, pend - p - 1, "%s%s", | |
2682 | (optcount == 0)? ":" : "@", inet_ntoa(addr))) | |
2683 | { | |
2684 | opt = NULL; | |
2685 | break; | |
2686 | } | |
2687 | p += Ustrlen(p); | |
2688 | adptr += sizeof(struct in_addr); | |
2689 | } | |
2690 | *p++ = ']'; | |
2691 | opt += opt[1]; | |
2692 | break; | |
2693 | ||
2694 | default: | |
2695 | { | |
2696 | int i; | |
2697 | if (pend - p < 4 + 3*opt[1]) { opt = NULL; break; } | |
2698 | Ustrcat(p, "[ "); | |
2699 | p += 2; | |
2700 | for (i = 0; i < opt[1]; i++) | |
5976eb99 | 2701 | p += sprintf(CS p, "%2.2x ", opt[i]); |
059ec3d9 PH |
2702 | *p++ = ']'; |
2703 | } | |
2704 | opt += opt[1]; | |
2705 | break; | |
2706 | } | |
2707 | } | |
2708 | ||
2709 | *p = 0; | |
2710 | log_write(0, LOG_MAIN, "%s", big_buffer); | |
2711 | ||
2712 | /* Refuse any call with IP options. This is what tcpwrappers 7.5 does. */ | |
2713 | ||
2714 | log_write(0, LOG_MAIN|LOG_REJECT, | |
2715 | "connection from %s refused (IP options)", host_and_ident(FALSE)); | |
2716 | ||
925ac8e4 | 2717 | smtp_printf("554 SMTP service not available\r\n", FALSE); |
059ec3d9 PH |
2718 | return FALSE; |
2719 | } | |
2720 | ||
2721 | /* Length of options = 0 => there are no options */ | |
2722 | ||
2723 | else DEBUG(D_receive) debug_printf("no IP options found\n"); | |
2724 | } | |
e0574cb5 | 2725 | #endif /* HAVE_IPV6 && !defined(NO_IP_OPTIONS) */ |
059ec3d9 PH |
2726 | |
2727 | /* Set keep-alive in socket options. The option is on by default. This | |
2728 | setting is an attempt to get rid of some hanging connections that stick in | |
2729 | read() when the remote end (usually a dialup) goes away. */ | |
2730 | ||
8768d548 | 2731 | if (smtp_accept_keepalive && !f.sender_host_notsocket) |
059ec3d9 PH |
2732 | ip_keepalive(fileno(smtp_out), sender_host_address, FALSE); |
2733 | ||
2734 | /* If the current host matches host_lookup, set the name by doing a | |
2735 | reverse lookup. On failure, sender_host_name will be NULL and | |
2736 | host_lookup_failed will be TRUE. This may or may not be serious - optional | |
2737 | checks later. */ | |
2738 | ||
2739 | if (verify_check_host(&host_lookup) == OK) | |
2740 | { | |
2741 | (void)host_name_lookup(); | |
2742 | host_build_sender_fullhost(); | |
2743 | } | |
2744 | ||
2745 | /* Delay this until we have the full name, if it is looked up. */ | |
2746 | ||
2747 | set_process_info("handling incoming connection from %s", | |
2748 | host_and_ident(FALSE)); | |
2749 | ||
1ad6489e JH |
2750 | /* Expand smtp_receive_timeout, if needed */ |
2751 | ||
2752 | if (smtp_receive_timeout_s) | |
2753 | { | |
2754 | uschar * exp; | |
2755 | if ( !(exp = expand_string(smtp_receive_timeout_s)) | |
2756 | || !(*exp) | |
2757 | || (smtp_receive_timeout = readconf_readtime(exp, 0, FALSE)) < 0 | |
2758 | ) | |
2759 | log_write(0, LOG_MAIN|LOG_PANIC, | |
2760 | "bad value for smtp_receive_timeout: '%s'", exp ? exp : US""); | |
2761 | } | |
2762 | ||
059ec3d9 PH |
2763 | /* Test for explicit connection rejection */ |
2764 | ||
2765 | if (verify_check_host(&host_reject_connection) == OK) | |
2766 | { | |
2767 | log_write(L_connection_reject, LOG_MAIN|LOG_REJECT, "refused connection " | |
2768 | "from %s (host_reject_connection)", host_and_ident(FALSE)); | |
925ac8e4 | 2769 | smtp_printf("554 SMTP service not available\r\n", FALSE); |
059ec3d9 PH |
2770 | return FALSE; |
2771 | } | |
2772 | ||
afb3eaaf PH |
2773 | /* Test with TCP Wrappers if so configured. There is a problem in that |
2774 | hosts_ctl() returns 0 (deny) under a number of system failure circumstances, | |
2775 | such as disks dying. In these cases, it is desirable to reject with a 4xx | |
2776 | error instead of a 5xx error. There isn't a "right" way to detect such | |
2777 | problems. The following kludge is used: errno is zeroed before calling | |
2778 | hosts_ctl(). If the result is "reject", a 5xx error is given only if the | |
2779 | value of errno is 0 or ENOENT (which happens if /etc/hosts.{allow,deny} does | |
2780 | not exist). */ | |
059ec3d9 | 2781 | |
1811cb4c | 2782 | #ifdef USE_TCP_WRAPPERS |
afb3eaaf | 2783 | errno = 0; |
1811cb4c | 2784 | if (!(tcp_wrappers_name = expand_string(tcp_wrappers_daemon_name))) |
5dc43717 JJ |
2785 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" " |
2786 | "(tcp_wrappers_name) failed: %s", string_printing(tcp_wrappers_name), | |
2787 | expand_string_message); | |
1811cb4c | 2788 | |
5dc43717 | 2789 | if (!hosts_ctl(tcp_wrappers_name, |
1811cb4c JH |
2790 | sender_host_name ? CS sender_host_name : STRING_UNKNOWN, |
2791 | sender_host_address ? CS sender_host_address : STRING_UNKNOWN, | |
2792 | sender_ident ? CS sender_ident : STRING_UNKNOWN)) | |
059ec3d9 | 2793 | { |
afb3eaaf PH |
2794 | if (errno == 0 || errno == ENOENT) |
2795 | { | |
2796 | HDEBUG(D_receive) debug_printf("tcp wrappers rejection\n"); | |
2797 | log_write(L_connection_reject, | |
2798 | LOG_MAIN|LOG_REJECT, "refused connection from %s " | |
2799 | "(tcp wrappers)", host_and_ident(FALSE)); | |
925ac8e4 | 2800 | smtp_printf("554 SMTP service not available\r\n", FALSE); |
afb3eaaf PH |
2801 | } |
2802 | else | |
2803 | { | |
2804 | int save_errno = errno; | |
2805 | HDEBUG(D_receive) debug_printf("tcp wrappers rejected with unexpected " | |
2806 | "errno value %d\n", save_errno); | |
2807 | log_write(L_connection_reject, | |
2808 | LOG_MAIN|LOG_REJECT, "temporarily refused connection from %s " | |
2809 | "(tcp wrappers errno=%d)", host_and_ident(FALSE), save_errno); | |
925ac8e4 | 2810 | smtp_printf("451 Temporary local problem - please try later\r\n", FALSE); |
afb3eaaf | 2811 | } |
059ec3d9 PH |
2812 | return FALSE; |
2813 | } | |
1811cb4c | 2814 | #endif |
059ec3d9 | 2815 | |
b01dd148 PH |
2816 | /* Check for reserved slots. The value of smtp_accept_count has already been |
2817 | incremented to include this process. */ | |
059ec3d9 PH |
2818 | |
2819 | if (smtp_accept_max > 0 && | |
b01dd148 | 2820 | smtp_accept_count > smtp_accept_max - smtp_accept_reserve) |
059ec3d9 PH |
2821 | { |
2822 | if ((rc = verify_check_host(&smtp_reserve_hosts)) != OK) | |
2823 | { | |
2824 | log_write(L_connection_reject, | |
2825 | LOG_MAIN, "temporarily refused connection from %s: not in " | |
2826 | "reserve list: connected=%d max=%d reserve=%d%s", | |
b01dd148 | 2827 | host_and_ident(FALSE), smtp_accept_count - 1, smtp_accept_max, |
059ec3d9 PH |
2828 | smtp_accept_reserve, (rc == DEFER)? " (lookup deferred)" : ""); |
2829 | smtp_printf("421 %s: Too many concurrent SMTP connections; " | |
925ac8e4 | 2830 | "please try again later\r\n", FALSE, smtp_active_hostname); |
059ec3d9 PH |
2831 | return FALSE; |
2832 | } | |
2833 | reserved_host = TRUE; | |
2834 | } | |
2835 | ||
2836 | /* If a load level above which only messages from reserved hosts are | |
2837 | accepted is set, check the load. For incoming calls via the daemon, the | |
2838 | check is done in the superior process if there are no reserved hosts, to | |
2839 | save a fork. In all cases, the load average will already be available | |
2840 | in a global variable at this point. */ | |
2841 | ||
2842 | if (smtp_load_reserve >= 0 && | |
2843 | load_average > smtp_load_reserve && | |
2844 | !reserved_host && | |
2845 | verify_check_host(&smtp_reserve_hosts) != OK) | |
2846 | { | |
2847 | log_write(L_connection_reject, | |
2848 | LOG_MAIN, "temporarily refused connection from %s: not in " | |
2849 | "reserve list and load average = %.2f", host_and_ident(FALSE), | |
2850 | (double)load_average/1000.0); | |
925ac8e4 | 2851 | smtp_printf("421 %s: Too much load; please try again later\r\n", FALSE, |
059ec3d9 PH |
2852 | smtp_active_hostname); |
2853 | return FALSE; | |
2854 | } | |
2855 | ||
2856 | /* Determine whether unqualified senders or recipients are permitted | |
2857 | for this host. Unfortunately, we have to do this every time, in order to | |
2858 | set the flags so that they can be inspected when considering qualifying | |
2859 | addresses in the headers. For a site that permits no qualification, this | |
2860 | won't take long, however. */ | |
2861 | ||
8768d548 | 2862 | f.allow_unqualified_sender = |
059ec3d9 PH |
2863 | verify_check_host(&sender_unqualified_hosts) == OK; |
2864 | ||
8768d548 | 2865 | f.allow_unqualified_recipient = |
059ec3d9 PH |
2866 | verify_check_host(&recipient_unqualified_hosts) == OK; |
2867 | ||
2868 | /* Determine whether HELO/EHLO is required for this host. The requirement | |
2869 | can be hard or soft. */ | |
2870 | ||
88752192 JH |
2871 | fl.helo_required = verify_check_host(&helo_verify_hosts) == OK; |
2872 | if (!fl.helo_required) | |
2873 | fl.helo_verify = verify_check_host(&helo_try_verify_hosts) == OK; | |
059ec3d9 PH |
2874 | |
2875 | /* Determine whether this hosts is permitted to send syntactic junk | |
2876 | after a HELO or EHLO command. */ | |
2877 | ||
88752192 | 2878 | fl.helo_accept_junk = verify_check_host(&helo_accept_junk_hosts) == OK; |
059ec3d9 PH |
2879 | } |
2880 | ||
2881 | /* For batch SMTP input we are now done. */ | |
2882 | ||
2883 | if (smtp_batched_input) return TRUE; | |
2884 | ||
a3c86431 TL |
2885 | /* If valid Proxy Protocol source is connecting, set up session. |
2886 | * Failure will not allow any SMTP function other than QUIT. */ | |
1811cb4c JH |
2887 | |
2888 | #ifdef SUPPORT_PROXY | |
a3c86431 | 2889 | proxy_session = FALSE; |
8768d548 | 2890 | f.proxy_session_failed = FALSE; |
a3c86431 | 2891 | if (check_proxy_protocol_host()) |
1811cb4c JH |
2892 | setup_proxy_protocol_host(); |
2893 | #endif | |
2894 | ||
2895 | /* Start up TLS if tls_on_connect is set. This is for supporting the legacy | |
2896 | smtps port for use with older style SSL MTAs. */ | |
2897 | ||
2898 | #ifdef SUPPORT_TLS | |
69d8eed7 JH |
2899 | if (tls_in.on_connect) |
2900 | { | |
2901 | if (tls_server_start(tls_require_ciphers, &user_msg) != OK) | |
2902 | return smtp_log_tls_fail(user_msg); | |
2903 | cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE; | |
2904 | } | |
a3c86431 TL |
2905 | #endif |
2906 | ||
1811cb4c | 2907 | /* Run the connect ACL if it exists */ |
059ec3d9 | 2908 | |
4e88a19f | 2909 | user_msg = NULL; |
3cc3f762 | 2910 | if (acl_smtp_connect) |
059ec3d9 PH |
2911 | { |
2912 | int rc; | |
3cc3f762 JH |
2913 | if ((rc = acl_check(ACL_WHERE_CONNECT, NULL, acl_smtp_connect, &user_msg, |
2914 | &log_msg)) != OK) | |
059ec3d9 | 2915 | { |
3cc3f762 | 2916 | (void) smtp_handle_acl_fail(ACL_WHERE_CONNECT, rc, user_msg, log_msg); |
059ec3d9 PH |
2917 | return FALSE; |
2918 | } | |
2919 | } | |
2920 | ||
2921 | /* Output the initial message for a two-way SMTP connection. It may contain | |
2922 | newlines, which then cause a multi-line response to be given. */ | |
2923 | ||
4e88a19f PH |
2924 | code = US"220"; /* Default status code */ |
2925 | esc = US""; /* Default extended status code */ | |
2926 | esclen = 0; /* Length of esc */ | |
2927 | ||
d4ff61d1 | 2928 | if (!user_msg) |
4e88a19f | 2929 | { |
d4ff61d1 | 2930 | if (!(s = expand_string(smtp_banner))) |
4e88a19f PH |
2931 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" (smtp_banner) " |
2932 | "failed: %s", smtp_banner, expand_string_message); | |
2933 | } | |
2934 | else | |
2935 | { | |
2936 | int codelen = 3; | |
2937 | s = user_msg; | |
4f6ae5c3 | 2938 | smtp_message_code(&code, &codelen, &s, NULL, TRUE); |
d6a96edc | 2939 | if (codelen > 4) |
4e88a19f PH |
2940 | { |
2941 | esc = code + 4; | |
2942 | esclen = codelen - 4; | |
2943 | } | |
2944 | } | |
059ec3d9 PH |
2945 | |
2946 | /* Remove any terminating newlines; might as well remove trailing space too */ | |
2947 | ||
2948 | p = s + Ustrlen(s); | |
2949 | while (p > s && isspace(p[-1])) p--; | |
2950 | *p = 0; | |
2951 | ||
2952 | /* It seems that CC:Mail is braindead, and assumes that the greeting message | |
2953 | is all contained in a single IP packet. The original code wrote out the | |
2954 | greeting using several calls to fprint/fputc, and on busy servers this could | |
2955 | cause it to be split over more than one packet - which caused CC:Mail to fall | |
2956 | over when it got the second part of the greeting after sending its first | |
2957 | command. Sigh. To try to avoid this, build the complete greeting message | |
2958 | first, and output it in one fell swoop. This gives a better chance of it | |
2959 | ending up as a single packet. */ | |
2960 | ||
acec9514 | 2961 | ss = string_get(256); |
059ec3d9 PH |
2962 | |
2963 | p = s; | |
2964 | do /* At least once, in case we have an empty string */ | |
2965 | { | |
2966 | int len; | |
2967 | uschar *linebreak = Ustrchr(p, '\n'); | |
acec9514 | 2968 | ss = string_catn(ss, code, 3); |
db57e575 | 2969 | if (!linebreak) |
059ec3d9 PH |
2970 | { |
2971 | len = Ustrlen(p); | |
acec9514 | 2972 | ss = string_catn(ss, US" ", 1); |
059ec3d9 PH |
2973 | } |
2974 | else | |
2975 | { | |
2976 | len = linebreak - p; | |
acec9514 | 2977 | ss = string_catn(ss, US"-", 1); |
059ec3d9 | 2978 | } |
acec9514 JH |
2979 | ss = string_catn(ss, esc, esclen); |
2980 | ss = string_catn(ss, p, len); | |
2981 | ss = string_catn(ss, US"\r\n", 2); | |
059ec3d9 | 2982 | p += len; |
db57e575 | 2983 | if (linebreak) p++; |
059ec3d9 | 2984 | } |
db57e575 | 2985 | while (*p); |
059ec3d9 | 2986 | |
059ec3d9 PH |
2987 | /* Before we write the banner, check that there is no input pending, unless |
2988 | this synchronisation check is disabled. */ | |
2989 | ||
a14e5636 | 2990 | if (!check_sync()) |
059ec3d9 | 2991 | { |
40525d07 JH |
2992 | unsigned n = smtp_inend - smtp_inptr; |
2993 | if (n > 32) n = 32; | |
2994 | ||
a14e5636 PH |
2995 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol " |
2996 | "synchronization error (input sent without waiting for greeting): " | |
2997 | "rejected connection from %s input=\"%s\"", host_and_ident(TRUE), | |
40525d07 | 2998 | string_printing(string_copyn(smtp_inptr, n))); |
925ac8e4 | 2999 | smtp_printf("554 SMTP synchronization error\r\n", FALSE); |
a14e5636 | 3000 | return FALSE; |
059ec3d9 PH |
3001 | } |
3002 | ||
3003 | /* Now output the banner */ | |
3004 | ||
acec9514 | 3005 | smtp_printf("%s", FALSE, string_from_gstring(ss)); |
a2673768 JH |
3006 | |
3007 | /* Attempt to see if we sent the banner before the last ACK of the 3-way | |
3008 | handshake arrived. If so we must have managed a TFO. */ | |
3009 | ||
3010 | #ifdef TCP_FASTOPEN | |
3011 | tfo_in_check(); | |
3012 | #endif | |
3013 | ||
059ec3d9 PH |
3014 | return TRUE; |
3015 | } | |
3016 | ||
3017 | ||
3018 | ||
3019 | ||
3020 | ||
3021 | /************************************************* | |
3022 | * Handle SMTP syntax and protocol errors * | |
3023 | *************************************************/ | |
3024 | ||
3025 | /* Write to the log for SMTP syntax errors in incoming commands, if configured | |
3026 | to do so. Then transmit the error response. The return value depends on the | |
3027 | number of syntax and protocol errors in this SMTP session. | |
3028 | ||
3029 | Arguments: | |
3030 | type error type, given as a log flag bit | |
3031 | code response code; <= 0 means don't send a response | |
3032 | data data to reflect in the response (can be NULL) | |
3033 | errmess the error message | |
3034 | ||
3035 | Returns: -1 limit of syntax/protocol errors NOT exceeded | |
3036 | +1 limit of syntax/protocol errors IS exceeded | |
3037 | ||
3038 | These values fit in with the values of the "done" variable in the main | |
3039 | processing loop in smtp_setup_msg(). */ | |
3040 | ||
3041 | static int | |
3042 | synprot_error(int type, int code, uschar *data, uschar *errmess) | |
3043 | { | |
3044 | int yield = -1; | |
3045 | ||
3046 | log_write(type, LOG_MAIN, "SMTP %s error in \"%s\" %s %s", | |
3047 | (type == L_smtp_syntax_error)? "syntax" : "protocol", | |
3ee512ff | 3048 | string_printing(smtp_cmd_buffer), host_and_ident(TRUE), errmess); |
059ec3d9 PH |
3049 | |
3050 | if (++synprot_error_count > smtp_max_synprot_errors) | |
3051 | { | |
3052 | yield = 1; | |
3053 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
3054 | "syntax or protocol errors (last command was \"%s\")", | |
0ebc4d69 | 3055 | host_and_ident(FALSE), string_printing(smtp_cmd_buffer)); |
059ec3d9 PH |
3056 | } |
3057 | ||
3058 | if (code > 0) | |
3059 | { | |
925ac8e4 JH |
3060 | smtp_printf("%d%c%s%s%s\r\n", FALSE, code, yield == 1 ? '-' : ' ', |
3061 | data ? data : US"", data ? US": " : US"", errmess); | |
059ec3d9 | 3062 | if (yield == 1) |
925ac8e4 | 3063 | smtp_printf("%d Too many syntax or protocol errors\r\n", FALSE, code); |
059ec3d9 PH |
3064 | } |
3065 | ||
3066 | return yield; | |
3067 | } | |
3068 | ||
3069 | ||
3070 | ||
3071 | ||
059ec3d9 PH |
3072 | /************************************************* |
3073 | * Send SMTP response, possibly multiline * | |
3074 | *************************************************/ | |
3075 | ||
3076 | /* There are, it seems, broken clients out there that cannot handle multiline | |
3077 | responses. If no_multiline_responses is TRUE (it can be set from an ACL), we | |
3078 | output nothing for non-final calls, and only the first line for anything else. | |
3079 | ||
3080 | Arguments: | |
a5bd321b | 3081 | code SMTP code, may involve extended status codes |
d6a96edc | 3082 | codelen length of smtp code; if > 4 there's an ESC |
059ec3d9 PH |
3083 | final FALSE if the last line isn't the final line |
3084 | msg message text, possibly containing newlines | |
3085 | ||
3086 | Returns: nothing | |
3087 | */ | |
3088 | ||
3089 | void | |
a5bd321b | 3090 | smtp_respond(uschar* code, int codelen, BOOL final, uschar *msg) |
059ec3d9 | 3091 | { |
a5bd321b PH |
3092 | int esclen = 0; |
3093 | uschar *esc = US""; | |
3094 | ||
8768d548 | 3095 | if (!final && f.no_multiline_responses) return; |
059ec3d9 | 3096 | |
d6a96edc | 3097 | if (codelen > 4) |
a5bd321b PH |
3098 | { |
3099 | esc = code + 4; | |
3100 | esclen = codelen - 4; | |
3101 | } | |
3102 | ||
2679d413 PH |
3103 | /* If this is the first output for a (non-batch) RCPT command, see if all RCPTs |
3104 | have had the same. Note: this code is also present in smtp_printf(). It would | |
3105 | be tidier to have it only in one place, but when it was added, it was easier to | |
3106 | do it that way, so as not to have to mess with the code for the RCPT command, | |
3107 | which sometimes uses smtp_printf() and sometimes smtp_respond(). */ | |
3108 | ||
88752192 | 3109 | if (fl.rcpt_in_progress) |
2679d413 PH |
3110 | { |
3111 | if (rcpt_smtp_response == NULL) | |
3112 | rcpt_smtp_response = string_copy(msg); | |
88752192 | 3113 | else if (fl.rcpt_smtp_response_same && |
2679d413 | 3114 | Ustrcmp(rcpt_smtp_response, msg) != 0) |
88752192 JH |
3115 | fl.rcpt_smtp_response_same = FALSE; |
3116 | fl.rcpt_in_progress = FALSE; | |
2679d413 PH |
3117 | } |
3118 | ||
e5de01f0 | 3119 | /* Now output the message, splitting it up into multiple lines if necessary. |
925ac8e4 JH |
3120 | We only handle pipelining these responses as far as nonfinal/final groups, |
3121 | not the whole MAIL/RCPT/DATA response set. */ | |
2679d413 | 3122 | |
059ec3d9 PH |
3123 | for (;;) |
3124 | { | |
3125 | uschar *nl = Ustrchr(msg, '\n'); | |
3126 | if (nl == NULL) | |
3127 | { | |
925ac8e4 | 3128 | smtp_printf("%.3s%c%.*s%s\r\n", !final, code, final ? ' ':'-', esclen, esc, msg); |
059ec3d9 PH |
3129 | return; |
3130 | } | |
8768d548 | 3131 | else if (nl[1] == 0 || f.no_multiline_responses) |
059ec3d9 | 3132 | { |
925ac8e4 | 3133 | smtp_printf("%.3s%c%.*s%.*s\r\n", !final, code, final ? ' ':'-', esclen, esc, |
a5bd321b | 3134 | (int)(nl - msg), msg); |
059ec3d9 PH |
3135 | return; |
3136 | } | |
3137 | else | |
3138 | { | |
925ac8e4 | 3139 | smtp_printf("%.3s-%.*s%.*s\r\n", TRUE, code, esclen, esc, (int)(nl - msg), msg); |
059ec3d9 PH |
3140 | msg = nl + 1; |
3141 | while (isspace(*msg)) msg++; | |
3142 | } | |
3143 | } | |
3144 | } | |
3145 | ||
3146 | ||
3147 | ||
3148 | ||
4e88a19f PH |
3149 | /************************************************* |
3150 | * Parse user SMTP message * | |
3151 | *************************************************/ | |
3152 | ||
3153 | /* This function allows for user messages overriding the response code details | |
3154 | by providing a suitable response code string at the start of the message | |
3155 | user_msg. Check the message for starting with a response code and optionally an | |
3156 | extended status code. If found, check that the first digit is valid, and if so, | |
3157 | change the code pointer and length to use the replacement. An invalid code | |
3158 | causes a panic log; in this case, if the log messages is the same as the user | |
3159 | message, we must also adjust the value of the log message to show the code that | |
3160 | is actually going to be used (the original one). | |
3161 | ||
3162 | This function is global because it is called from receive.c as well as within | |
3163 | this module. | |
3164 | ||
d6a96edc PH |
3165 | Note that the code length returned includes the terminating whitespace |
3166 | character, which is always included in the regex match. | |
3167 | ||
4e88a19f PH |
3168 | Arguments: |
3169 | code SMTP code, may involve extended status codes | |
d6a96edc | 3170 | codelen length of smtp code; if > 4 there's an ESC |
4e88a19f PH |
3171 | msg message text |
3172 | log_msg optional log message, to be adjusted with the new SMTP code | |
4f6ae5c3 | 3173 | check_valid if true, verify the response code |
4e88a19f PH |
3174 | |
3175 | Returns: nothing | |
3176 | */ | |
3177 | ||
3178 | void | |
4f6ae5c3 JH |
3179 | smtp_message_code(uschar **code, int *codelen, uschar **msg, uschar **log_msg, |
3180 | BOOL check_valid) | |
4e88a19f PH |
3181 | { |
3182 | int n; | |
3183 | int ovector[3]; | |
3184 | ||
4f6ae5c3 | 3185 | if (!msg || !*msg) return; |
4e88a19f | 3186 | |
4f6ae5c3 JH |
3187 | if ((n = pcre_exec(regex_smtp_code, NULL, CS *msg, Ustrlen(*msg), 0, |
3188 | PCRE_EOPT, ovector, sizeof(ovector)/sizeof(int))) < 0) return; | |
4e88a19f | 3189 | |
4f6ae5c3 | 3190 | if (check_valid && (*msg)[0] != (*code)[0]) |
4e88a19f PH |
3191 | { |
3192 | log_write(0, LOG_MAIN|LOG_PANIC, "configured error code starts with " | |
3193 | "incorrect digit (expected %c) in \"%s\"", (*code)[0], *msg); | |
3194 | if (log_msg != NULL && *log_msg == *msg) | |
3195 | *log_msg = string_sprintf("%s %s", *code, *log_msg + ovector[1]); | |
3196 | } | |
3197 | else | |
3198 | { | |
3199 | *code = *msg; | |
3200 | *codelen = ovector[1]; /* Includes final space */ | |
3201 | } | |
3202 | *msg += ovector[1]; /* Chop the code off the message */ | |
3203 | return; | |
3204 | } | |
3205 | ||
3206 | ||
3207 | ||
3208 | ||
059ec3d9 PH |
3209 | /************************************************* |
3210 | * Handle an ACL failure * | |
3211 | *************************************************/ | |
3212 | ||
3213 | /* This function is called when acl_check() fails. As well as calls from within | |
3214 | this module, it is called from receive.c for an ACL after DATA. It sorts out | |
5b6f7658 | 3215 | logging the incident, and sends the error response. A message containing |
059ec3d9 PH |
3216 | newlines is turned into a multiline SMTP response, but for logging, only the |
3217 | first line is used. | |
3218 | ||
a5bd321b PH |
3219 | There's a table of default permanent failure response codes to use in |
3220 | globals.c, along with the table of names. VFRY is special. Despite RFC1123 it | |
3221 | defaults disabled in Exim. However, discussion in connection with RFC 821bis | |
3222 | (aka RFC 2821) has concluded that the response should be 252 in the disabled | |
3223 | state, because there are broken clients that try VRFY before RCPT. A 5xx | |
3224 | response should be given only when the address is positively known to be | |
4f6ae5c3 JH |
3225 | undeliverable. Sigh. We return 252 if there is no VRFY ACL or it provides |
3226 | no explicit code, but if there is one we let it know best. | |
3227 | Also, for ETRN, 458 is given on refusal, and for AUTH, 503. | |
a5bd321b PH |
3228 | |
3229 | From Exim 4.63, it is possible to override the response code details by | |
3230 | providing a suitable response code string at the start of the message provided | |
3231 | in user_msg. The code's first digit is checked for validity. | |
059ec3d9 PH |
3232 | |
3233 | Arguments: | |
4f6ae5c3 JH |
3234 | where where the ACL was called from |
3235 | rc the failure code | |
3236 | user_msg a message that can be included in an SMTP response | |
3237 | log_msg a message for logging | |
059ec3d9 PH |
3238 | |
3239 | Returns: 0 in most cases | |
3240 | 2 if the failure code was FAIL_DROP, in which case the | |
3241 | SMTP connection should be dropped (this value fits with the | |
3242 | "done" variable in smtp_setup_msg() below) | |
3243 | */ | |
3244 | ||
3245 | int | |
3246 | smtp_handle_acl_fail(int where, int rc, uschar *user_msg, uschar *log_msg) | |
3247 | { | |
059ec3d9 | 3248 | BOOL drop = rc == FAIL_DROP; |
a5bd321b | 3249 | int codelen = 3; |
a5bd321b | 3250 | uschar *smtp_code; |
059ec3d9 PH |
3251 | uschar *lognl; |
3252 | uschar *sender_info = US""; | |
64ffc24f | 3253 | uschar *what = |
8523533c | 3254 | #ifdef WITH_CONTENT_SCAN |
3cc3f762 | 3255 | where == ACL_WHERE_MIME ? US"during MIME ACL checks" : |
8e669ac1 | 3256 | #endif |
3cc3f762 JH |
3257 | where == ACL_WHERE_PREDATA ? US"DATA" : |
3258 | where == ACL_WHERE_DATA ? US"after DATA" : | |
8ccd00b1 | 3259 | #ifndef DISABLE_PRDR |
3cc3f762 | 3260 | where == ACL_WHERE_PRDR ? US"after DATA PRDR" : |
fd98a5c6 | 3261 | #endif |
3cc3f762 JH |
3262 | smtp_cmd_data ? |
3263 | string_sprintf("%s %s", acl_wherenames[where], smtp_cmd_data) : | |
3264 | string_sprintf("%s in \"connect\" ACL", acl_wherenames[where]); | |
059ec3d9 PH |
3265 | |
3266 | if (drop) rc = FAIL; | |
3267 | ||
4e88a19f | 3268 | /* Set the default SMTP code, and allow a user message to change it. */ |
a5bd321b | 3269 | |
4f6ae5c3 JH |
3270 | smtp_code = rc == FAIL ? acl_wherecodes[where] : US"451"; |
3271 | smtp_message_code(&smtp_code, &codelen, &user_msg, &log_msg, | |
3272 | where != ACL_WHERE_VRFY); | |
a5bd321b | 3273 | |
059ec3d9 PH |
3274 | /* We used to have sender_address here; however, there was a bug that was not |
3275 | updating sender_address after a rewrite during a verify. When this bug was | |
3276 | fixed, sender_address at this point became the rewritten address. I'm not sure | |
3277 | this is what should be logged, so I've changed to logging the unrewritten | |
3278 | address to retain backward compatibility. */ | |
3279 | ||
8523533c | 3280 | #ifndef WITH_CONTENT_SCAN |
059ec3d9 | 3281 | if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA) |
8523533c TK |
3282 | #else |
3283 | if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA || where == ACL_WHERE_MIME) | |
3284 | #endif | |
059ec3d9 | 3285 | { |
b98bb9ac PP |
3286 | sender_info = string_sprintf("F=<%s>%s%s%s%s ", |
3287 | sender_address_unrewritten ? sender_address_unrewritten : sender_address, | |
3288 | sender_host_authenticated ? US" A=" : US"", | |
3289 | sender_host_authenticated ? sender_host_authenticated : US"", | |
3290 | sender_host_authenticated && authenticated_id ? US":" : US"", | |
3291 | sender_host_authenticated && authenticated_id ? authenticated_id : US"" | |
3292 | ); | |
059ec3d9 PH |
3293 | } |
3294 | ||
3295 | /* If there's been a sender verification failure with a specific message, and | |
3296 | we have not sent a response about it yet, do so now, as a preliminary line for | |
278c6e6c PH |
3297 | failures, but not defers. However, always log it for defer, and log it for fail |
3298 | unless the sender_verify_fail log selector has been turned off. */ | |
059ec3d9 | 3299 | |
02b41d71 | 3300 | if (sender_verified_failed && |
059ec3d9 PH |
3301 | !testflag(sender_verified_failed, af_sverify_told)) |
3302 | { | |
88752192 JH |
3303 | BOOL save_rcpt_in_progress = fl.rcpt_in_progress; |
3304 | fl.rcpt_in_progress = FALSE; /* So as not to treat these as the error */ | |
2679d413 | 3305 | |
059ec3d9 PH |
3306 | setflag(sender_verified_failed, af_sverify_told); |
3307 | ||
6c6d6e48 | 3308 | if (rc != FAIL || LOGGING(sender_verify_fail)) |
278c6e6c PH |
3309 | log_write(0, LOG_MAIN|LOG_REJECT, "%s sender verify %s for <%s>%s", |
3310 | host_and_ident(TRUE), | |
3311 | ((sender_verified_failed->special_action & 255) == DEFER)? "defer":"fail", | |
3312 | sender_verified_failed->address, | |
3313 | (sender_verified_failed->message == NULL)? US"" : | |
3314 | string_sprintf(": %s", sender_verified_failed->message)); | |
059ec3d9 | 3315 | |
02b41d71 | 3316 | if (rc == FAIL && sender_verified_failed->user_message) |
a5bd321b | 3317 | smtp_respond(smtp_code, codelen, FALSE, string_sprintf( |
059ec3d9 PH |
3318 | testflag(sender_verified_failed, af_verify_pmfail)? |
3319 | "Postmaster verification failed while checking <%s>\n%s\n" | |
3320 | "Several RFCs state that you are required to have a postmaster\n" | |
3321 | "mailbox for each mail domain. This host does not accept mail\n" | |
3322 | "from domains whose servers reject the postmaster address." | |
3323 | : | |
3324 | testflag(sender_verified_failed, af_verify_nsfail)? | |
3325 | "Callback setup failed while verifying <%s>\n%s\n" | |
3326 | "The initial connection, or a HELO or MAIL FROM:<> command was\n" | |
3327 | "rejected. Refusing MAIL FROM:<> does not help fight spam, disregards\n" | |
3328 | "RFC requirements, and stops you from receiving standard bounce\n" | |
3329 | "messages. This host does not accept mail from domains whose servers\n" | |
3330 | "refuse bounces." | |
3331 | : | |
3332 | "Verification failed for <%s>\n%s", | |
3333 | sender_verified_failed->address, | |
3334 | sender_verified_failed->user_message)); | |
2679d413 | 3335 | |
88752192 | 3336 | fl.rcpt_in_progress = save_rcpt_in_progress; |
059ec3d9 PH |
3337 | } |
3338 | ||
3339 | /* Sort out text for logging */ | |
3340 | ||
3cc3f762 JH |
3341 | log_msg = log_msg ? string_sprintf(": %s", log_msg) : US""; |
3342 | if ((lognl = Ustrchr(log_msg, '\n'))) *lognl = 0; | |
059ec3d9 PH |
3343 | |
3344 | /* Send permanent failure response to the command, but the code used isn't | |
3345 | always a 5xx one - see comments at the start of this function. If the original | |
3346 | rc was FAIL_DROP we drop the connection and yield 2. */ | |
3347 | ||
ff5929e3 JH |
3348 | if (rc == FAIL) |
3349 | smtp_respond(smtp_code, codelen, TRUE, | |
3350 | user_msg ? user_msg : US"Administrative prohibition"); | |
059ec3d9 PH |
3351 | |
3352 | /* Send temporary failure response to the command. Don't give any details, | |
3353 | unless acl_temp_details is set. This is TRUE for a callout defer, a "defer" | |
3354 | verb, and for a header verify when smtp_return_error_details is set. | |
3355 | ||
3356 | This conditional logic is all somewhat of a mess because of the odd | |
3357 | interactions between temp_details and return_error_details. One day it should | |
3358 | be re-implemented in a tidier fashion. */ | |
3359 | ||
3360 | else | |
8768d548 | 3361 | if (f.acl_temp_details && user_msg) |
059ec3d9 | 3362 | { |
ff5929e3 JH |
3363 | if ( smtp_return_error_details |
3364 | && sender_verified_failed | |
3365 | && sender_verified_failed->message | |
3366 | ) | |
a5bd321b | 3367 | smtp_respond(smtp_code, codelen, FALSE, sender_verified_failed->message); |
ff5929e3 | 3368 | |
a5bd321b | 3369 | smtp_respond(smtp_code, codelen, TRUE, user_msg); |
059ec3d9 PH |
3370 | } |
3371 | else | |
a5bd321b PH |
3372 | smtp_respond(smtp_code, codelen, TRUE, |
3373 | US"Temporary local problem - please try later"); | |
059ec3d9 | 3374 | |
6ea85e9a PH |
3375 | /* Log the incident to the logs that are specified by log_reject_target |
3376 | (default main, reject). This can be empty to suppress logging of rejections. If | |
3377 | the connection is not forcibly to be dropped, return 0. Otherwise, log why it | |
3378 | is closing if required and return 2. */ | |
059ec3d9 | 3379 | |
6ea85e9a | 3380 | if (log_reject_target != 0) |
887291d2 | 3381 | { |
e45a1c37 | 3382 | #ifdef SUPPORT_TLS |
acec9514 JH |
3383 | gstring * g = s_tlslog(NULL); |
3384 | uschar * tls = string_from_gstring(g); | |
fc16abb4 | 3385 | if (!tls) tls = US""; |
e45a1c37 | 3386 | #else |
fc16abb4 | 3387 | uschar * tls = US""; |
e45a1c37 | 3388 | #endif |
3cc3f762 JH |
3389 | log_write(where == ACL_WHERE_CONNECT ? L_connection_reject : 0, |
3390 | log_reject_target, "%s%s%s %s%srejected %s%s", | |
fc16abb4 JH |
3391 | LOGGING(dnssec) && sender_host_dnssec ? US" DS" : US"", |
3392 | host_and_ident(TRUE), | |
3393 | tls, | |
3394 | sender_info, | |
3395 | rc == FAIL ? US"" : US"temporarily ", | |
3396 | what, log_msg); | |
887291d2 | 3397 | } |
059ec3d9 PH |
3398 | |
3399 | if (!drop) return 0; | |
3400 | ||
3401 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by DROP in ACL", | |
3402 | smtp_get_connection_info()); | |
8f128379 PH |
3403 | |
3404 | /* Run the not-quit ACL, but without any custom messages. This should not be a | |
3405 | problem, because we get here only if some other ACL has issued "drop", and | |
3406 | in that case, *its* custom messages will have been used above. */ | |
3407 | ||
3408 | smtp_notquit_exit(US"acl-drop", NULL, NULL); | |
059ec3d9 PH |
3409 | return 2; |
3410 | } | |
3411 | ||
3412 | ||
3413 | ||
3414 | ||
8f128379 PH |
3415 | /************************************************* |
3416 | * Handle SMTP exit when QUIT is not given * | |
3417 | *************************************************/ | |
3418 | ||
3419 | /* This function provides a logging/statistics hook for when an SMTP connection | |
3420 | is dropped on the floor or the other end goes away. It's a global function | |
3421 | because it's called from receive.c as well as this module. As well as running | |
3422 | the NOTQUIT ACL, if there is one, this function also outputs a final SMTP | |
3423 | response, either with a custom message from the ACL, or using a default. There | |
3424 | is one case, however, when no message is output - after "drop". In that case, | |
3425 | the ACL that obeyed "drop" has already supplied the custom message, and NULL is | |
3426 | passed to this function. | |
3427 | ||
3428 | In case things go wrong while processing this function, causing an error that | |
4c04137d | 3429 | may re-enter this function, there is a recursion check. |
8f128379 PH |
3430 | |
3431 | Arguments: | |
3432 | reason What $smtp_notquit_reason will be set to in the ACL; | |
3433 | if NULL, the ACL is not run | |
3434 | code The error code to return as part of the response | |
3435 | defaultrespond The default message if there's no user_msg | |
3436 | ||
3437 | Returns: Nothing | |
3438 | */ | |
3439 | ||
3440 | void | |
3441 | smtp_notquit_exit(uschar *reason, uschar *code, uschar *defaultrespond, ...) | |
3442 | { | |
3443 | int rc; | |
3444 | uschar *user_msg = NULL; | |
3445 | uschar *log_msg = NULL; | |
3446 | ||
3447 | /* Check for recursive acll */ | |
3448 | ||
88752192 | 3449 | if (fl.smtp_exit_function_called) |
8f128379 PH |
3450 | { |
3451 | log_write(0, LOG_PANIC, "smtp_notquit_exit() called more than once (%s)", | |
3452 | reason); | |
3453 | return; | |
3454 | } | |
88752192 | 3455 | fl.smtp_exit_function_called = TRUE; |
8f128379 PH |
3456 | |
3457 | /* Call the not-QUIT ACL, if there is one, unless no reason is given. */ | |
3458 | ||
eea0defe | 3459 | if (acl_smtp_notquit && reason) |
8f128379 PH |
3460 | { |
3461 | smtp_notquit_reason = reason; | |
eea0defe JB |
3462 | if ((rc = acl_check(ACL_WHERE_NOTQUIT, NULL, acl_smtp_notquit, &user_msg, |
3463 | &log_msg)) == ERROR) | |
8f128379 PH |
3464 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL for not-QUIT returned ERROR: %s", |
3465 | log_msg); | |
3466 | } | |
3467 | ||
3468 | /* Write an SMTP response if we are expected to give one. As the default | |
3469 | responses are all internal, they should always fit in the buffer, but code a | |
3470 | warning, just in case. Note that string_vformat() still leaves a complete | |
3471 | string, even if it is incomplete. */ | |
3472 | ||
eea0defe | 3473 | if (code && defaultrespond) |
8f128379 | 3474 | { |
eea0defe JB |
3475 | if (user_msg) |
3476 | smtp_respond(code, 3, TRUE, user_msg); | |
3477 | else | |
8f128379 PH |
3478 | { |
3479 | uschar buffer[128]; | |
3480 | va_list ap; | |
3481 | va_start(ap, defaultrespond); | |
3482 | if (!string_vformat(buffer, sizeof(buffer), CS defaultrespond, ap)) | |
3483 | log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_notquit_exit()"); | |
925ac8e4 | 3484 | smtp_printf("%s %s\r\n", FALSE, code, buffer); |
8f128379 PH |
3485 | va_end(ap); |
3486 | } | |
8f128379 PH |
3487 | mac_smtp_fflush(); |
3488 | } | |
3489 | } | |
3490 | ||
3491 | ||
3492 | ||
3493 | ||
d7b47fd0 PH |
3494 | /************************************************* |
3495 | * Verify HELO argument * | |
3496 | *************************************************/ | |
3497 | ||
3498 | /* This function is called if helo_verify_hosts or helo_try_verify_hosts is | |
3499 | matched. It is also called from ACL processing if verify = helo is used and | |
3500 | verification was not previously tried (i.e. helo_try_verify_hosts was not | |
3501 | matched). The result of its processing is to set helo_verified and | |
3502 | helo_verify_failed. These variables should both be FALSE for this function to | |
3503 | be called. | |
3504 | ||
3505 | Note that EHLO/HELO is legitimately allowed to quote an address literal. Allow | |
3506 | for IPv6 ::ffff: literals. | |
3507 | ||
3508 | Argument: none | |
3509 | Returns: TRUE if testing was completed; | |
3510 | FALSE on a temporary failure | |
3511 | */ | |
3512 | ||
3513 | BOOL | |
3514 | smtp_verify_helo(void) | |
3515 | { | |
3516 | BOOL yield = TRUE; | |
3517 | ||
3518 | HDEBUG(D_receive) debug_printf("verifying EHLO/HELO argument \"%s\"\n", | |
3519 | sender_helo_name); | |
3520 | ||
3521 | if (sender_helo_name == NULL) | |
3522 | { | |
3523 | HDEBUG(D_receive) debug_printf("no EHLO/HELO command was issued\n"); | |
3524 | } | |
3525 | ||
d1d5595c PH |
3526 | /* Deal with the case of -bs without an IP address */ |
3527 | ||
3528 | else if (sender_host_address == NULL) | |
3529 | { | |
3530 | HDEBUG(D_receive) debug_printf("no client IP address: assume success\n"); | |
8768d548 | 3531 | f.helo_verified = TRUE; |
d1d5595c PH |
3532 | } |
3533 | ||
3534 | /* Deal with the more common case when there is a sending IP address */ | |
3535 | ||
d7b47fd0 PH |
3536 | else if (sender_helo_name[0] == '[') |
3537 | { | |
8768d548 | 3538 | f.helo_verified = Ustrncmp(sender_helo_name+1, sender_host_address, |
d7b47fd0 PH |
3539 | Ustrlen(sender_host_address)) == 0; |
3540 | ||
e0574cb5 | 3541 | #if HAVE_IPV6 |
8768d548 | 3542 | if (!f.helo_verified) |
d7b47fd0 PH |
3543 | { |
3544 | if (strncmpic(sender_host_address, US"::ffff:", 7) == 0) | |
8768d548 | 3545 | f.helo_verified = Ustrncmp(sender_helo_name + 1, |
d7b47fd0 PH |
3546 | sender_host_address + 7, Ustrlen(sender_host_address) - 7) == 0; |
3547 | } | |
e0574cb5 | 3548 | #endif |
d7b47fd0 PH |
3549 | |
3550 | HDEBUG(D_receive) | |
8768d548 | 3551 | { if (f.helo_verified) debug_printf("matched host address\n"); } |
d7b47fd0 PH |
3552 | } |
3553 | ||
3554 | /* Do a reverse lookup if one hasn't already given a positive or negative | |
3555 | response. If that fails, or the name doesn't match, try checking with a forward | |
3556 | lookup. */ | |
3557 | ||
3558 | else | |
3559 | { | |
3560 | if (sender_host_name == NULL && !host_lookup_failed) | |
3561 | yield = host_name_lookup() != DEFER; | |
3562 | ||
3563 | /* If a host name is known, check it and all its aliases. */ | |
3564 | ||
1705dd20 | 3565 | if (sender_host_name) |
8768d548 | 3566 | if ((f.helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0)) |
d7b47fd0 | 3567 | { |
1705dd20 | 3568 | sender_helo_dnssec = sender_host_dnssec; |
d7b47fd0 PH |
3569 | HDEBUG(D_receive) debug_printf("matched host name\n"); |
3570 | } | |
3571 | else | |
3572 | { | |
3573 | uschar **aliases = sender_host_aliases; | |
1705dd20 | 3574 | while (*aliases) |
8768d548 | 3575 | if ((f.helo_verified = strcmpic(*aliases++, sender_helo_name) == 0)) |
1705dd20 JH |
3576 | { |
3577 | sender_helo_dnssec = sender_host_dnssec; | |
3578 | break; | |
3579 | } | |
3580 | ||
8768d548 | 3581 | HDEBUG(D_receive) if (f.helo_verified) |
d7b47fd0 | 3582 | debug_printf("matched alias %s\n", *(--aliases)); |
d7b47fd0 | 3583 | } |
d7b47fd0 PH |
3584 | |
3585 | /* Final attempt: try a forward lookup of the helo name */ | |
3586 | ||
8768d548 | 3587 | if (!f.helo_verified) |
d7b47fd0 PH |
3588 | { |
3589 | int rc; | |
3590 | host_item h; | |
1705dd20 JH |
3591 | dnssec_domains d; |
3592 | host_item *hh; | |
3593 | ||
d7b47fd0 PH |
3594 | h.name = sender_helo_name; |
3595 | h.address = NULL; | |
3596 | h.mx = MX_NONE; | |
3597 | h.next = NULL; | |
1705dd20 JH |
3598 | d.request = US"*"; |
3599 | d.require = US""; | |
3600 | ||
d7b47fd0 PH |
3601 | HDEBUG(D_receive) debug_printf("getting IP address for %s\n", |
3602 | sender_helo_name); | |
66387a73 | 3603 | rc = host_find_bydns(&h, NULL, HOST_FIND_BY_A | HOST_FIND_BY_AAAA, |
1705dd20 | 3604 | NULL, NULL, NULL, &d, NULL, NULL); |
d7b47fd0 | 3605 | if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL) |
1705dd20 | 3606 | for (hh = &h; hh; hh = hh->next) |
d7b47fd0 PH |
3607 | if (Ustrcmp(hh->address, sender_host_address) == 0) |
3608 | { | |
8768d548 | 3609 | f.helo_verified = TRUE; |
1705dd20 | 3610 | if (h.dnssec == DS_YES) sender_helo_dnssec = TRUE; |
d7b47fd0 | 3611 | HDEBUG(D_receive) |
1705dd20 JH |
3612 | { |
3613 | debug_printf("IP address for %s matches calling address\n" | |
3614 | "Forward DNS security status: %sverified\n", | |
3615 | sender_helo_name, sender_helo_dnssec ? "" : "un"); | |
3616 | } | |
d7b47fd0 PH |
3617 | break; |
3618 | } | |
d7b47fd0 PH |
3619 | } |
3620 | } | |
3621 | ||
8768d548 | 3622 | if (!f.helo_verified) f.helo_verify_failed = TRUE; /* We've tried ... */ |
d7b47fd0 PH |
3623 | return yield; |
3624 | } | |
3625 | ||
3626 | ||
3627 | ||
3628 | ||
4e88a19f PH |
3629 | /************************************************* |
3630 | * Send user response message * | |
3631 | *************************************************/ | |
3632 | ||
3633 | /* This function is passed a default response code and a user message. It calls | |
3634 | smtp_message_code() to check and possibly modify the response code, and then | |
3635 | calls smtp_respond() to transmit the response. I put this into a function | |
3636 | just to avoid a lot of repetition. | |
3637 | ||
3638 | Arguments: | |
3639 | code the response code | |
3640 | user_msg the user message | |
3641 | ||
3642 | Returns: nothing | |
3643 | */ | |
3644 | ||
3645 | static void | |
3646 | smtp_user_msg(uschar *code, uschar *user_msg) | |
3647 | { | |
3648 | int len = 3; | |
4f6ae5c3 | 3649 | smtp_message_code(&code, &len, &user_msg, NULL, TRUE); |
4e88a19f PH |
3650 | smtp_respond(code, len, TRUE, user_msg); |
3651 | } | |
3652 | ||
3653 | ||
3654 | ||
b3ef41c9 JH |
3655 | static int |
3656 | smtp_in_auth(auth_instance *au, uschar ** s, uschar ** ss) | |
3657 | { | |
3658 | const uschar *set_id = NULL; | |
3659 | int rc, i; | |
3660 | ||
3661 | /* Run the checking code, passing the remainder of the command line as | |
3662 | data. Initials the $auth<n> variables as empty. Initialize $0 empty and set | |
3663 | it as the only set numerical variable. The authenticator may set $auth<n> | |
3664 | and also set other numeric variables. The $auth<n> variables are preferred | |
3665 | nowadays; the numerical variables remain for backwards compatibility. | |
3666 | ||
3667 | Afterwards, have a go at expanding the set_id string, even if | |
3668 | authentication failed - for bad passwords it can be useful to log the | |
3669 | userid. On success, require set_id to expand and exist, and put it in | |
3670 | authenticated_id. Save this in permanent store, as the working store gets | |
3671 | reset at HELO, RSET, etc. */ | |
3672 | ||
3673 | for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; | |
3674 | expand_nmax = 0; | |
3675 | expand_nlength[0] = 0; /* $0 contains nothing */ | |
3676 | ||
3677 | rc = (au->info->servercode)(au, smtp_cmd_data); | |
3678 | if (au->set_id) set_id = expand_string(au->set_id); | |
3679 | expand_nmax = -1; /* Reset numeric variables */ | |
3680 | for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; /* Reset $auth<n> */ | |
3681 | ||
3682 | /* The value of authenticated_id is stored in the spool file and printed in | |
3683 | log lines. It must not contain binary zeros or newline characters. In | |
3684 | normal use, it never will, but when playing around or testing, this error | |
3685 | can (did) happen. To guard against this, ensure that the id contains only | |
3686 | printing characters. */ | |
3687 | ||
3688 | if (set_id) set_id = string_printing(set_id); | |
3689 | ||
3690 | /* For the non-OK cases, set up additional logging data if set_id | |
3691 | is not empty. */ | |
3692 | ||
3693 | if (rc != OK) | |
3694 | set_id = set_id && *set_id | |
3695 | ? string_sprintf(" (set_id=%s)", set_id) : US""; | |
3696 | ||
3697 | /* Switch on the result */ | |
3698 | ||
3699 | switch(rc) | |
3700 | { | |
3701 | case OK: | |
3702 | if (!au->set_id || set_id) /* Complete success */ | |
3703 | { | |
3704 | if (set_id) authenticated_id = string_copy_malloc(set_id); | |
3705 | sender_host_authenticated = au->name; | |
c44ff8be | 3706 | sender_host_auth_pubname = au->public_name; |
b3ef41c9 JH |
3707 | authentication_failed = FALSE; |
3708 | authenticated_fail_id = NULL; /* Impossible to already be set? */ | |
3709 | ||
3710 | received_protocol = | |
3711 | (sender_host_address ? protocols : protocols_local) | |
74f1a423 | 3712 | [pextend + pauthed + (tls_in.active.sock >= 0 ? pcrpted:0)]; |
b3ef41c9 JH |
3713 | *s = *ss = US"235 Authentication succeeded"; |
3714 | authenticated_by = au; | |
3715 | break; | |
3716 | } | |
3717 | ||
3718 | /* Authentication succeeded, but we failed to expand the set_id string. | |
3719 | Treat this as a temporary error. */ | |
3720 | ||
3721 | auth_defer_msg = expand_string_message; | |
3722 | /* Fall through */ | |
3723 | ||
3724 | case DEFER: | |
3725 | if (set_id) authenticated_fail_id = string_copy_malloc(set_id); | |
3726 | *s = string_sprintf("435 Unable to authenticate at present%s", | |
3727 | auth_defer_user_msg); | |
3728 | *ss = string_sprintf("435 Unable to authenticate at present%s: %s", | |
3729 | set_id, auth_defer_msg); | |
3730 | break; | |
3731 | ||
3732 | case BAD64: | |
3733 | *s = *ss = US"501 Invalid base64 data"; | |
3734 | break; | |
3735 | ||
3736 | case CANCELLED: | |
3737 | *s = *ss = US"501 Authentication cancelled"; | |
3738 | break; | |
3739 | ||
3740 | case UNEXPECTED: | |
3741 | *s = *ss = US"553 Initial data not expected"; | |
3742 | break; | |
3743 | ||
3744 | case FAIL: | |
3745 | if (set_id) authenticated_fail_id = string_copy_malloc(set_id); | |
3746 | *s = US"535 Incorrect authentication data"; | |
3747 | *ss = string_sprintf("535 Incorrect authentication data%s", set_id); | |
3748 | break; | |
3749 | ||
3750 | default: | |
3751 | if (set_id) authenticated_fail_id = string_copy_malloc(set_id); | |
3752 | *s = US"435 Internal error"; | |
3753 | *ss = string_sprintf("435 Internal error%s: return %d from authentication " | |
3754 | "check", set_id, rc); | |
3755 | break; | |
3756 | } | |
3757 | ||
3758 | return rc; | |
3759 | } | |
3760 | ||
3761 | ||
3762 | ||
2685d6e0 JH |
3763 | |
3764 | ||
3765 | static int | |
3766 | qualify_recipient(uschar ** recipient, uschar * smtp_cmd_data, uschar * tag) | |
3767 | { | |
3768 | int rd; | |
8768d548 | 3769 | if (f.allow_unqualified_recipient || strcmpic(*recipient, US"postmaster") == 0) |
2685d6e0 JH |
3770 | { |
3771 | DEBUG(D_receive) debug_printf("unqualified address %s accepted\n", | |
3772 | *recipient); | |
3773 | rd = Ustrlen(recipient) + 1; | |
3774 | *recipient = rewrite_address_qualify(*recipient, TRUE); | |
3775 | return rd; | |
3776 | } | |
925ac8e4 | 3777 | smtp_printf("501 %s: recipient address must contain a domain\r\n", FALSE, |
2685d6e0 JH |
3778 | smtp_cmd_data); |
3779 | log_write(L_smtp_syntax_error, | |
3780 | LOG_MAIN|LOG_REJECT, "unqualified %s rejected: <%s> %s%s", | |
3781 | tag, *recipient, host_and_ident(TRUE), host_lookup_msg); | |
3782 | return 0; | |
3783 | } | |
3784 | ||
3785 | ||
3786 | ||
3787 | ||
7e3ce68e JH |
3788 | static void |
3789 | smtp_quit_handler(uschar ** user_msgp, uschar ** log_msgp) | |
3790 | { | |
3791 | HAD(SCH_QUIT); | |
3792 | incomplete_transaction_log(US"QUIT"); | |
60d10ce7 | 3793 | if (acl_smtp_quit) |
7e3ce68e JH |
3794 | { |
3795 | int rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, user_msgp, log_msgp); | |
3796 | if (rc == ERROR) | |
3797 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s", | |
3798 | *log_msgp); | |
3799 | } | |
3800 | if (*user_msgp) | |
3801 | smtp_respond(US"221", 3, TRUE, *user_msgp); | |
3802 | else | |
925ac8e4 | 3803 | smtp_printf("221 %s closing connection\r\n", FALSE, smtp_active_hostname); |
7e3ce68e JH |
3804 | |
3805 | #ifdef SUPPORT_TLS | |
74f1a423 | 3806 | tls_close(NULL, TLS_SHUTDOWN_NOWAIT); |
7e3ce68e JH |
3807 | #endif |
3808 | ||
3809 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT", | |
3810 | smtp_get_connection_info()); | |
3811 | } | |
3812 | ||
3813 | ||
3814 | static void | |
3815 | smtp_rset_handler(void) | |
3816 | { | |
3817 | HAD(SCH_RSET); | |
3818 | incomplete_transaction_log(US"RSET"); | |
925ac8e4 | 3819 | smtp_printf("250 Reset OK\r\n", FALSE); |
7e3ce68e JH |
3820 | cmd_list[CMD_LIST_RSET].is_mail_cmd = FALSE; |
3821 | } | |
3822 | ||
3823 | ||
3824 | ||
059ec3d9 PH |
3825 | /************************************************* |
3826 | * Initialize for SMTP incoming message * | |
3827 | *************************************************/ | |
3828 | ||
3829 | /* This function conducts the initial dialogue at the start of an incoming SMTP | |
3830 | message, and builds a list of recipients. However, if the incoming message | |
3831 | is part of a batch (-bS option) a separate function is called since it would | |
3832 | be messy having tests splattered about all over this function. This function | |
3833 | therefore handles the case where interaction is occurring. The input and output | |
3834 | files are set up in smtp_in and smtp_out. | |
3835 | ||
3836 | The global recipients_list is set to point to a vector of recipient_item | |
3837 | blocks, whose number is given by recipients_count. This is extended by the | |
3838 | receive_add_recipient() function. The global variable sender_address is set to | |
3839 | the sender's address. The yield is +1 if a message has been successfully | |
3840 | started, 0 if a QUIT command was encountered or the connection was refused from | |
3841 | the particular host, or -1 if the connection was lost. | |
3842 | ||
3843 | Argument: none | |
3844 | ||
3845 | Returns: > 0 message successfully started (reached DATA) | |
3846 | = 0 QUIT read or end of file reached or call refused | |
3847 | < 0 lost connection | |
3848 | */ | |
3849 | ||
3850 | int | |
3851 | smtp_setup_msg(void) | |
3852 | { | |
3853 | int done = 0; | |
3854 | BOOL toomany = FALSE; | |
3855 | BOOL discarded = FALSE; | |
3856 | BOOL last_was_rej_mail = FALSE; | |
3857 | BOOL last_was_rcpt = FALSE; | |
3858 | void *reset_point = store_get(0); | |
3859 | ||
3860 | DEBUG(D_receive) debug_printf("smtp_setup_msg entered\n"); | |
3861 | ||
3862 | /* Reset for start of new message. We allow one RSET not to be counted as a | |
3863 | nonmail command, for those MTAs that insist on sending it between every | |
3864 | message. Ditto for EHLO/HELO and for STARTTLS, to allow for going in and out of | |
3865 | TLS between messages (an Exim client may do this if it has messages queued up | |
3866 | for the host). Note: we do NOT reset AUTH at this point. */ | |
3867 | ||
3868 | smtp_reset(reset_point); | |
3869 | message_ended = END_NOTSTARTED; | |
3870 | ||
8768d548 | 3871 | chunking_state = f.chunking_offered ? CHUNKING_OFFERED : CHUNKING_NOT_OFFERED; |
7e3ce68e | 3872 | |
059ec3d9 PH |
3873 | cmd_list[CMD_LIST_RSET].is_mail_cmd = TRUE; |
3874 | cmd_list[CMD_LIST_HELO].is_mail_cmd = TRUE; | |
3875 | cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE; | |
3876 | #ifdef SUPPORT_TLS | |
3877 | cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = TRUE; | |
3878 | #endif | |
3879 | ||
3880 | /* Set the local signal handler for SIGTERM - it tries to end off tidily */ | |
3881 | ||
9723f966 | 3882 | had_command_sigterm = 0; |
059ec3d9 PH |
3883 | os_non_restarting_signal(SIGTERM, command_sigterm_handler); |
3884 | ||
3885 | /* Batched SMTP is handled in a different function. */ | |
3886 | ||
3887 | if (smtp_batched_input) return smtp_setup_batch_msg(); | |
3888 | ||
3889 | /* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE | |
3890 | value. The values are 2 larger than the required yield of the function. */ | |
3891 | ||
3892 | while (done <= 0) | |
3893 | { | |
55414b25 | 3894 | const uschar **argv; |
059ec3d9 PH |
3895 | uschar *etrn_command; |
3896 | uschar *etrn_serialize_key; | |
3897 | uschar *errmess; | |
4e88a19f PH |
3898 | uschar *log_msg, *smtp_code; |
3899 | uschar *user_msg = NULL; | |
059ec3d9 PH |
3900 | uschar *recipient = NULL; |
3901 | uschar *hello = NULL; | |
059ec3d9 PH |
3902 | uschar *s, *ss; |
3903 | BOOL was_rej_mail = FALSE; | |
3904 | BOOL was_rcpt = FALSE; | |
3905 | void (*oldsignal)(int); | |
3906 | pid_t pid; | |
3907 | int start, end, sender_domain, recipient_domain; | |
acec9514 | 3908 | int rc; |
aa7751be | 3909 | int c; |
059ec3d9 | 3910 | auth_instance *au; |
6c1c3d1d | 3911 | uschar *orcpt = NULL; |
ea97267c | 3912 | int dsn_flags; |
acec9514 | 3913 | gstring * g; |
059ec3d9 | 3914 | |
16be7f11 | 3915 | #ifdef AUTH_TLS |
b3ef41c9 | 3916 | /* Check once per STARTTLS or SSL-on-connect for a TLS AUTH */ |
74f1a423 | 3917 | if ( tls_in.active.sock >= 0 |
b3ef41c9 JH |
3918 | && tls_in.peercert |
3919 | && tls_in.certificate_verified | |
3920 | && cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd | |
3921 | ) | |
3922 | { | |
3923 | cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = FALSE; | |
b3ef41c9 JH |
3924 | |
3925 | for (au = auths; au; au = au->next) | |
3926 | if (strcmpic(US"tls", au->driver_name) == 0) | |
3927 | { | |
b64d13ee JH |
3928 | if ( acl_smtp_auth |
3929 | && (rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth, | |
3930 | &user_msg, &log_msg)) != OK | |
3931 | ) | |
3932 | done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg); | |
805bb5c3 | 3933 | else |
b64d13ee JH |
3934 | { |
3935 | smtp_cmd_data = NULL; | |
3936 | ||
3937 | if (smtp_in_auth(au, &s, &ss) == OK) | |
3938 | { DEBUG(D_auth) debug_printf("tls auth succeeded\n"); } | |
3939 | else | |
3940 | { DEBUG(D_auth) debug_printf("tls auth not succeeded\n"); } | |
3941 | } | |
b3ef41c9 JH |
3942 | break; |
3943 | } | |
3944 | } | |
3945 | #endif | |
3946 | ||
8d330698 JH |
3947 | #ifdef TCP_QUICKACK |
3948 | if (smtp_in) /* Avoid pure-ACKs while in cmd pingpong phase */ | |
3949 | (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK, | |
3950 | US &off, sizeof(off)); | |
3951 | #endif | |
3952 | ||
bd8fbe36 | 3953 | switch(smtp_read_command(TRUE, GETC_BUFFER_UNLIMITED)) |
059ec3d9 PH |
3954 | { |
3955 | /* The AUTH command is not permitted to occur inside a transaction, and may | |
c46782ef PH |
3956 | occur successfully only once per connection. Actually, that isn't quite |
3957 | true. When TLS is started, all previous information about a connection must | |
3958 | be discarded, so a new AUTH is permitted at that time. | |
3959 | ||
3960 | AUTH may only be used when it has been advertised. However, it seems that | |
3961 | there are clients that send AUTH when it hasn't been advertised, some of | |
3962 | them even doing this after HELO. And there are MTAs that accept this. Sigh. | |
3963 | So there's a get-out that allows this to happen. | |
059ec3d9 PH |
3964 | |
3965 | AUTH is initially labelled as a "nonmail command" so that one occurrence | |
3966 | doesn't get counted. We change the label here so that multiple failing | |
3967 | AUTHS will eventually hit the nonmail threshold. */ | |
3968 | ||
3969 | case AUTH_CMD: | |
e0574cb5 JH |
3970 | HAD(SCH_AUTH); |
3971 | authentication_failed = TRUE; | |
3972 | cmd_list[CMD_LIST_AUTH].is_mail_cmd = FALSE; | |
059ec3d9 | 3973 | |
88752192 | 3974 | if (!fl.auth_advertised && !f.allow_auth_unadvertised) |
e0574cb5 JH |
3975 | { |
3976 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3977 | US"AUTH command used when not advertised"); | |
3978 | break; | |
3979 | } | |
3980 | if (sender_host_authenticated) | |
3981 | { | |
3982 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3983 | US"already authenticated"); | |
3984 | break; | |
3985 | } | |
3986 | if (sender_address) | |
3987 | { | |
3988 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3989 | US"not permitted in mail transaction"); | |
3990 | break; | |
3991 | } | |
059ec3d9 | 3992 | |
e0574cb5 | 3993 | /* Check the ACL */ |
059ec3d9 | 3994 | |
e0574cb5 JH |
3995 | if ( acl_smtp_auth |
3996 | && (rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth, | |
3997 | &user_msg, &log_msg)) != OK | |
3998 | ) | |
3999 | { | |
4000 | done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg); | |
4001 | break; | |
4002 | } | |
059ec3d9 | 4003 | |
e0574cb5 | 4004 | /* Find the name of the requested authentication mechanism. */ |
059ec3d9 | 4005 | |
e0574cb5 JH |
4006 | s = smtp_cmd_data; |
4007 | while ((c = *smtp_cmd_data) != 0 && !isspace(c)) | |
4008 | { | |
4009 | if (!isalnum(c) && c != '-' && c != '_') | |
4010 | { | |
4011 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4012 | US"invalid character in authentication mechanism name"); | |
4013 | goto COMMAND_LOOP; | |
4014 | } | |
4015 | smtp_cmd_data++; | |
4016 | } | |
059ec3d9 | 4017 | |
e0574cb5 JH |
4018 | /* If not at the end of the line, we must be at white space. Terminate the |
4019 | name and move the pointer on to any data that may be present. */ | |
059ec3d9 | 4020 | |
e0574cb5 JH |
4021 | if (*smtp_cmd_data != 0) |
4022 | { | |
4023 | *smtp_cmd_data++ = 0; | |
4024 | while (isspace(*smtp_cmd_data)) smtp_cmd_data++; | |
4025 | } | |
059ec3d9 | 4026 | |
e0574cb5 JH |
4027 | /* Search for an authentication mechanism which is configured for use |
4028 | as a server and which has been advertised (unless, sigh, allow_auth_ | |
4029 | unadvertised is set). */ | |
059ec3d9 | 4030 | |
e0574cb5 JH |
4031 | for (au = auths; au; au = au->next) |
4032 | if (strcmpic(s, au->public_name) == 0 && au->server && | |
8768d548 | 4033 | (au->advertised || f.allow_auth_unadvertised)) |
e0574cb5 | 4034 | break; |
059ec3d9 | 4035 | |
e0574cb5 JH |
4036 | if (au) |
4037 | { | |
4038 | c = smtp_in_auth(au, &s, &ss); | |
059ec3d9 | 4039 | |
e0574cb5 JH |
4040 | smtp_printf("%s\r\n", FALSE, s); |
4041 | if (c != OK) | |
4042 | log_write(0, LOG_MAIN|LOG_REJECT, "%s authenticator failed for %s: %s", | |
4043 | au->name, host_and_ident(FALSE), ss); | |
4044 | } | |
4045 | else | |
4046 | done = synprot_error(L_smtp_protocol_error, 504, NULL, | |
4047 | string_sprintf("%s authentication mechanism not supported", s)); | |
059ec3d9 | 4048 | |
e0574cb5 | 4049 | break; /* AUTH_CMD */ |
059ec3d9 PH |
4050 | |
4051 | /* The HELO/EHLO commands are permitted to appear in the middle of a | |
4052 | session as well as at the beginning. They have the effect of a reset in | |
4053 | addition to their other functions. Their absence at the start cannot be | |
4054 | taken to be an error. | |
4055 | ||
4056 | RFC 2821 says: | |
4057 | ||
4058 | If the EHLO command is not acceptable to the SMTP server, 501, 500, | |
4059 | or 502 failure replies MUST be returned as appropriate. The SMTP | |
4060 | server MUST stay in the same state after transmitting these replies | |
4061 | that it was in before the EHLO was received. | |
4062 | ||
4063 | Therefore, we do not do the reset until after checking the command for | |
4064 | acceptability. This change was made for Exim release 4.11. Previously | |
4065 | it did the reset first. */ | |
4066 | ||
4067 | case HELO_CMD: | |
e0574cb5 JH |
4068 | HAD(SCH_HELO); |
4069 | hello = US"HELO"; | |
88752192 | 4070 | fl.esmtp = FALSE; |
e0574cb5 | 4071 | goto HELO_EHLO; |
059ec3d9 PH |
4072 | |
4073 | case EHLO_CMD: | |
e0574cb5 JH |
4074 | HAD(SCH_EHLO); |
4075 | hello = US"EHLO"; | |
88752192 | 4076 | fl.esmtp = TRUE; |
059ec3d9 PH |
4077 | |
4078 | HELO_EHLO: /* Common code for HELO and EHLO */ | |
e0574cb5 JH |
4079 | cmd_list[CMD_LIST_HELO].is_mail_cmd = FALSE; |
4080 | cmd_list[CMD_LIST_EHLO].is_mail_cmd = FALSE; | |
059ec3d9 | 4081 | |
e0574cb5 JH |
4082 | /* Reject the HELO if its argument was invalid or non-existent. A |
4083 | successful check causes the argument to be saved in malloc store. */ | |
059ec3d9 | 4084 | |
e0574cb5 JH |
4085 | if (!check_helo(smtp_cmd_data)) |
4086 | { | |
4087 | smtp_printf("501 Syntactically invalid %s argument(s)\r\n", FALSE, hello); | |
059ec3d9 | 4088 | |
e0574cb5 JH |
4089 | log_write(0, LOG_MAIN|LOG_REJECT, "rejected %s from %s: syntactically " |
4090 | "invalid argument(s): %s", hello, host_and_ident(FALSE), | |
4091 | *smtp_cmd_argument == 0 ? US"(no argument given)" : | |
4092 | string_printing(smtp_cmd_argument)); | |
059ec3d9 | 4093 | |
e0574cb5 JH |
4094 | if (++synprot_error_count > smtp_max_synprot_errors) |
4095 | { | |
4096 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
4097 | "syntax or protocol errors (last command was \"%s\")", | |
4098 | host_and_ident(FALSE), string_printing(smtp_cmd_buffer)); | |
4099 | done = 1; | |
4100 | } | |
059ec3d9 | 4101 | |
e0574cb5 JH |
4102 | break; |
4103 | } | |
059ec3d9 | 4104 | |
e0574cb5 JH |
4105 | /* If sender_host_unknown is true, we have got here via the -bs interface, |
4106 | not called from inetd. Otherwise, we are running an IP connection and the | |
4107 | host address will be set. If the helo name is the primary name of this | |
4108 | host and we haven't done a reverse lookup, force one now. If helo_required | |
4109 | is set, ensure that the HELO name matches the actual host. If helo_verify | |
4110 | is set, do the same check, but softly. */ | |
059ec3d9 | 4111 | |
8768d548 | 4112 | if (!f.sender_host_unknown) |
e0574cb5 | 4113 | { |
8768d548 | 4114 | BOOL old_helo_verified = f.helo_verified; |
e0574cb5 | 4115 | uschar *p = smtp_cmd_data; |
059ec3d9 | 4116 | |
e0574cb5 JH |
4117 | while (*p != 0 && !isspace(*p)) { *p = tolower(*p); p++; } |
4118 | *p = 0; | |
059ec3d9 | 4119 | |
e0574cb5 JH |
4120 | /* Force a reverse lookup if HELO quoted something in helo_lookup_domains |
4121 | because otherwise the log can be confusing. */ | |
059ec3d9 | 4122 | |
e0574cb5 JH |
4123 | if ( !sender_host_name |
4124 | && (deliver_domain = sender_helo_name, /* set $domain */ | |
4125 | match_isinlist(sender_helo_name, CUSS &helo_lookup_domains, 0, | |
4126 | &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL)) == OK) | |
4127 | (void)host_name_lookup(); | |
059ec3d9 | 4128 | |
e0574cb5 JH |
4129 | /* Rebuild the fullhost info to include the HELO name (and the real name |
4130 | if it was looked up.) */ | |
059ec3d9 | 4131 | |
e0574cb5 JH |
4132 | host_build_sender_fullhost(); /* Rebuild */ |
4133 | set_process_info("handling%s incoming connection from %s", | |
4134 | tls_in.active.sock >= 0 ? " TLS" : "", host_and_ident(FALSE)); | |
059ec3d9 | 4135 | |
e0574cb5 JH |
4136 | /* Verify if configured. This doesn't give much security, but it does |
4137 | make some people happy to be able to do it. If helo_required is set, | |
4138 | (host matches helo_verify_hosts) failure forces rejection. If helo_verify | |
4139 | is set (host matches helo_try_verify_hosts), it does not. This is perhaps | |
4140 | now obsolescent, since the verification can now be requested selectively | |
4141 | at ACL time. */ | |
059ec3d9 | 4142 | |
8768d548 | 4143 | f.helo_verified = f.helo_verify_failed = sender_helo_dnssec = FALSE; |
88752192 | 4144 | if (fl.helo_required || fl.helo_verify) |
e0574cb5 JH |
4145 | { |
4146 | BOOL tempfail = !smtp_verify_helo(); | |
8768d548 | 4147 | if (!f.helo_verified) |
e0574cb5 | 4148 | { |
88752192 | 4149 | if (fl.helo_required) |
e0574cb5 JH |
4150 | { |
4151 | smtp_printf("%d %s argument does not match calling host\r\n", FALSE, | |
4152 | tempfail? 451 : 550, hello); | |
4153 | log_write(0, LOG_MAIN|LOG_REJECT, "%srejected \"%s %s\" from %s", | |
4154 | tempfail? "temporarily " : "", | |
4155 | hello, sender_helo_name, host_and_ident(FALSE)); | |
8768d548 | 4156 | f.helo_verified = old_helo_verified; |
e0574cb5 JH |
4157 | break; /* End of HELO/EHLO processing */ |
4158 | } | |
4159 | HDEBUG(D_all) debug_printf("%s verification failed but host is in " | |
4160 | "helo_try_verify_hosts\n", hello); | |
4161 | } | |
4162 | } | |
4163 | } | |
059ec3d9 | 4164 | |
7952eef9 | 4165 | #ifdef SUPPORT_SPF |
e0574cb5 JH |
4166 | /* set up SPF context */ |
4167 | spf_init(sender_helo_name, sender_host_address); | |
8523533c TK |
4168 | #endif |
4169 | ||
e0574cb5 JH |
4170 | /* Apply an ACL check if one is defined; afterwards, recheck |
4171 | synchronization in case the client started sending in a delay. */ | |
059ec3d9 | 4172 | |
e0574cb5 JH |
4173 | if (acl_smtp_helo) |
4174 | if ((rc = acl_check(ACL_WHERE_HELO, NULL, acl_smtp_helo, | |
4175 | &user_msg, &log_msg)) != OK) | |
a5c60e3c | 4176 | { |
e0574cb5 JH |
4177 | done = smtp_handle_acl_fail(ACL_WHERE_HELO, rc, user_msg, log_msg); |
4178 | if (sender_helo_name) | |
4179 | { | |
4180 | store_free(sender_helo_name); | |
4181 | sender_helo_name = NULL; | |
4182 | } | |
4183 | host_build_sender_fullhost(); /* Rebuild */ | |
4184 | break; | |
a5c60e3c | 4185 | } |
e0574cb5 | 4186 | else if (!check_sync()) goto SYNC_FAILURE; |
059ec3d9 | 4187 | |
e0574cb5 JH |
4188 | /* Generate an OK reply. The default string includes the ident if present, |
4189 | and also the IP address if present. Reflecting back the ident is intended | |
4190 | as a deterrent to mail forgers. For maximum efficiency, and also because | |
4191 | some broken systems expect each response to be in a single packet, arrange | |
4192 | that the entire reply is sent in one write(). */ | |
059ec3d9 | 4193 | |
88752192 | 4194 | fl.auth_advertised = FALSE; |
8768d548 | 4195 | f.smtp_in_pipelining_advertised = FALSE; |
d1a13eea | 4196 | #ifdef SUPPORT_TLS |
88752192 | 4197 | fl.tls_advertised = FALSE; |
8ac90765 | 4198 | # ifdef EXPERIMENTAL_REQUIRETLS |
88752192 | 4199 | fl.requiretls_advertised = FALSE; |
8ac90765 | 4200 | # endif |
d1a13eea | 4201 | #endif |
88752192 | 4202 | fl.dsn_advertised = FALSE; |
8c5d388a | 4203 | #ifdef SUPPORT_I18N |
88752192 | 4204 | fl.smtputf8_advertised = FALSE; |
d1a13eea | 4205 | #endif |
059ec3d9 | 4206 | |
e0574cb5 JH |
4207 | smtp_code = US"250 "; /* Default response code plus space*/ |
4208 | if (!user_msg) | |
4209 | { | |
4210 | s = string_sprintf("%.3s %s Hello %s%s%s", | |
4211 | smtp_code, | |
4212 | smtp_active_hostname, | |
4213 | sender_ident ? sender_ident : US"", | |
4214 | sender_ident ? US" at " : US"", | |
4215 | sender_host_name ? sender_host_name : sender_helo_name); | |
4216 | g = string_cat(NULL, s); | |
4217 | ||
4218 | if (sender_host_address) | |
4219 | { | |
4220 | g = string_catn(g, US" [", 2); | |
4221 | g = string_cat (g, sender_host_address); | |
4222 | g = string_catn(g, US"]", 1); | |
4223 | } | |
4224 | } | |
4e88a19f | 4225 | |
e0574cb5 JH |
4226 | /* A user-supplied EHLO greeting may not contain more than one line. Note |
4227 | that the code returned by smtp_message_code() includes the terminating | |
4228 | whitespace character. */ | |
059ec3d9 | 4229 | |
e0574cb5 JH |
4230 | else |
4231 | { | |
4232 | char *ss; | |
4233 | int codelen = 4; | |
4234 | smtp_message_code(&smtp_code, &codelen, &user_msg, NULL, TRUE); | |
4235 | s = string_sprintf("%.*s%s", codelen, smtp_code, user_msg); | |
4236 | if ((ss = strpbrk(CS s, "\r\n")) != NULL) | |
4237 | { | |
4238 | log_write(0, LOG_MAIN|LOG_PANIC, "EHLO/HELO response must not contain " | |
4239 | "newlines: message truncated: %s", string_printing(s)); | |
4240 | *ss = 0; | |
4241 | } | |
4242 | g = string_cat(NULL, s); | |
4243 | } | |
059ec3d9 | 4244 | |
e0574cb5 | 4245 | g = string_catn(g, US"\r\n", 2); |
059ec3d9 | 4246 | |
e0574cb5 JH |
4247 | /* If we received EHLO, we must create a multiline response which includes |
4248 | the functions supported. */ | |
059ec3d9 | 4249 | |
88752192 | 4250 | if (fl.esmtp) |
e0574cb5 JH |
4251 | { |
4252 | g->s[3] = '-'; | |
059ec3d9 | 4253 | |
e0574cb5 JH |
4254 | /* I'm not entirely happy with this, as an MTA is supposed to check |
4255 | that it has enough room to accept a message of maximum size before | |
4256 | it sends this. However, there seems little point in not sending it. | |
4257 | The actual size check happens later at MAIL FROM time. By postponing it | |
4258 | till then, VRFY and EXPN can be used after EHLO when space is short. */ | |
059ec3d9 | 4259 | |
e0574cb5 JH |
4260 | if (thismessage_size_limit > 0) |
4261 | { | |
4262 | sprintf(CS big_buffer, "%.3s-SIZE %d\r\n", smtp_code, | |
4263 | thismessage_size_limit); | |
4264 | g = string_cat(g, big_buffer); | |
4265 | } | |
4266 | else | |
4267 | { | |
4268 | g = string_catn(g, smtp_code, 3); | |
4269 | g = string_catn(g, US"-SIZE\r\n", 7); | |
4270 | } | |
059ec3d9 | 4271 | |
e0574cb5 JH |
4272 | /* Exim does not do protocol conversion or data conversion. It is 8-bit |
4273 | clean; if it has an 8-bit character in its hand, it just sends it. It | |
4274 | cannot therefore specify 8BITMIME and remain consistent with the RFCs. | |
4275 | However, some users want this option simply in order to stop MUAs | |
4276 | mangling messages that contain top-bit-set characters. It is therefore | |
4277 | provided as an option. */ | |
059ec3d9 | 4278 | |
e0574cb5 JH |
4279 | if (accept_8bitmime) |
4280 | { | |
4281 | g = string_catn(g, smtp_code, 3); | |
4282 | g = string_catn(g, US"-8BITMIME\r\n", 11); | |
4283 | } | |
059ec3d9 | 4284 | |
e0574cb5 JH |
4285 | /* Advertise DSN support if configured to do so. */ |
4286 | if (verify_check_host(&dsn_advertise_hosts) != FAIL) | |
4287 | { | |
4288 | g = string_catn(g, smtp_code, 3); | |
4289 | g = string_catn(g, US"-DSN\r\n", 6); | |
88752192 | 4290 | fl.dsn_advertised = TRUE; |
e0574cb5 | 4291 | } |
6c1c3d1d | 4292 | |
e0574cb5 JH |
4293 | /* Advertise ETRN/VRFY/EXPN if there's are ACL checking whether a host is |
4294 | permitted to issue them; a check is made when any host actually tries. */ | |
059ec3d9 | 4295 | |
e0574cb5 JH |
4296 | if (acl_smtp_etrn) |
4297 | { | |
4298 | g = string_catn(g, smtp_code, 3); | |
4299 | g = string_catn(g, US"-ETRN\r\n", 7); | |
4300 | } | |
4301 | if (acl_smtp_vrfy) | |
4302 | { | |
4303 | g = string_catn(g, smtp_code, 3); | |
4304 | g = string_catn(g, US"-VRFY\r\n", 7); | |
4305 | } | |
4306 | if (acl_smtp_expn) | |
4307 | { | |
4308 | g = string_catn(g, smtp_code, 3); | |
4309 | g = string_catn(g, US"-EXPN\r\n", 7); | |
4310 | } | |
059ec3d9 | 4311 | |
e0574cb5 JH |
4312 | /* Exim is quite happy with pipelining, so let the other end know that |
4313 | it is safe to use it, unless advertising is disabled. */ | |
059ec3d9 | 4314 | |
8768d548 | 4315 | if (f.pipelining_enable && |
e0574cb5 JH |
4316 | verify_check_host(&pipelining_advertise_hosts) == OK) |
4317 | { | |
4318 | g = string_catn(g, smtp_code, 3); | |
4319 | g = string_catn(g, US"-PIPELINING\r\n", 13); | |
4320 | sync_cmd_limit = NON_SYNC_CMD_PIPELINING; | |
8768d548 | 4321 | f.smtp_in_pipelining_advertised = TRUE; |
e0574cb5 | 4322 | } |
059ec3d9 | 4323 | |
fd98a5c6 | 4324 | |
e0574cb5 JH |
4325 | /* If any server authentication mechanisms are configured, advertise |
4326 | them if the current host is in auth_advertise_hosts. The problem with | |
4327 | advertising always is that some clients then require users to | |
4328 | authenticate (and aren't configurable otherwise) even though it may not | |
4329 | be necessary (e.g. if the host is in host_accept_relay). | |
059ec3d9 | 4330 | |
e0574cb5 JH |
4331 | RFC 2222 states that SASL mechanism names contain only upper case |
4332 | letters, so output the names in upper case, though we actually recognize | |
4333 | them in either case in the AUTH command. */ | |
059ec3d9 | 4334 | |
e0574cb5 | 4335 | if ( auths |
16be7f11 | 4336 | #ifdef AUTH_TLS |
e0574cb5 | 4337 | && !sender_host_authenticated |
b3ef41c9 | 4338 | #endif |
e0574cb5 JH |
4339 | && verify_check_host(&auth_advertise_hosts) == OK |
4340 | ) | |
8b6b06fe | 4341 | { |
e0574cb5 JH |
4342 | auth_instance *au; |
4343 | BOOL first = TRUE; | |
4344 | for (au = auths; au; au = au->next) | |
b3ef41c9 | 4345 | { |
e0574cb5 JH |
4346 | au->advertised = FALSE; |
4347 | if (au->server) | |
b3ef41c9 | 4348 | { |
e0574cb5 JH |
4349 | DEBUG(D_auth+D_expand) debug_printf_indent( |
4350 | "Evaluating advertise_condition for %s athenticator\n", | |
4351 | au->public_name); | |
4352 | if ( !au->advertise_condition | |
4353 | || expand_check_condition(au->advertise_condition, au->name, | |
4354 | US"authenticator") | |
4355 | ) | |
8b6b06fe | 4356 | { |
e0574cb5 JH |
4357 | int saveptr; |
4358 | if (first) | |
4359 | { | |
4360 | g = string_catn(g, smtp_code, 3); | |
4361 | g = string_catn(g, US"-AUTH", 5); | |
4362 | first = FALSE; | |
88752192 | 4363 | fl.auth_advertised = TRUE; |
e0574cb5 JH |
4364 | } |
4365 | saveptr = g->ptr; | |
4366 | g = string_catn(g, US" ", 1); | |
4367 | g = string_cat (g, au->public_name); | |
4368 | while (++saveptr < g->ptr) g->s[saveptr] = toupper(g->s[saveptr]); | |
4369 | au->advertised = TRUE; | |
8b6b06fe | 4370 | } |
b3ef41c9 | 4371 | } |
b3ef41c9 | 4372 | } |
b3ef41c9 | 4373 | |
e0574cb5 JH |
4374 | if (!first) g = string_catn(g, US"\r\n", 2); |
4375 | } | |
059ec3d9 | 4376 | |
e0574cb5 | 4377 | /* RFC 3030 CHUNKING */ |
059ec3d9 | 4378 | |
e0574cb5 JH |
4379 | if (verify_check_host(&chunking_advertise_hosts) != FAIL) |
4380 | { | |
4381 | g = string_catn(g, smtp_code, 3); | |
4382 | g = string_catn(g, US"-CHUNKING\r\n", 11); | |
8768d548 | 4383 | f.chunking_offered = TRUE; |
e0574cb5 JH |
4384 | chunking_state = CHUNKING_OFFERED; |
4385 | } | |
aa368db3 | 4386 | |
e0574cb5 JH |
4387 | /* Advertise TLS (Transport Level Security) aka SSL (Secure Socket Layer) |
4388 | if it has been included in the binary, and the host matches | |
4389 | tls_advertise_hosts. We must *not* advertise if we are already in a | |
4390 | secure connection. */ | |
18481de3 | 4391 | |
d1a13eea | 4392 | #ifdef SUPPORT_TLS |
e0574cb5 JH |
4393 | if (tls_in.active.sock < 0 && |
4394 | verify_check_host(&tls_advertise_hosts) != FAIL) | |
4395 | { | |
4396 | g = string_catn(g, smtp_code, 3); | |
4397 | g = string_catn(g, US"-STARTTLS\r\n", 11); | |
88752192 | 4398 | fl.tls_advertised = TRUE; |
e0574cb5 | 4399 | } |
8ac90765 JH |
4400 | |
4401 | # ifdef EXPERIMENTAL_REQUIRETLS | |
e0574cb5 JH |
4402 | /* Advertise REQUIRETLS only once we are in a secure connection */ |
4403 | if ( tls_in.active.sock >= 0 | |
4404 | && verify_check_host(&tls_advertise_requiretls) != FAIL) | |
4405 | { | |
4406 | g = string_catn(g, smtp_code, 3); | |
4407 | g = string_catn(g, US"-REQUIRETLS\r\n", 13); | |
88752192 | 4408 | fl.requiretls_advertised = TRUE; |
e0574cb5 | 4409 | } |
8ac90765 | 4410 | # endif |
d1a13eea | 4411 | #endif |
059ec3d9 | 4412 | |
d1a13eea | 4413 | #ifndef DISABLE_PRDR |
e0574cb5 JH |
4414 | /* Per Recipient Data Response, draft by Eric A. Hall extending RFC */ |
4415 | if (prdr_enable) | |
4416 | { | |
4417 | g = string_catn(g, smtp_code, 3); | |
4418 | g = string_catn(g, US"-PRDR\r\n", 7); | |
4419 | } | |
d1a13eea JH |
4420 | #endif |
4421 | ||
8c5d388a | 4422 | #ifdef SUPPORT_I18N |
e0574cb5 JH |
4423 | if ( accept_8bitmime |
4424 | && verify_check_host(&smtputf8_advertise_hosts) != FAIL) | |
4425 | { | |
4426 | g = string_catn(g, smtp_code, 3); | |
4427 | g = string_catn(g, US"-SMTPUTF8\r\n", 11); | |
88752192 | 4428 | fl.smtputf8_advertised = TRUE; |
e0574cb5 | 4429 | } |
d1a13eea | 4430 | #endif |
fd98a5c6 | 4431 | |
e0574cb5 | 4432 | /* Finish off the multiline reply with one that is always available. */ |
059ec3d9 | 4433 | |
e0574cb5 JH |
4434 | g = string_catn(g, smtp_code, 3); |
4435 | g = string_catn(g, US" HELP\r\n", 7); | |
4436 | } | |
059ec3d9 | 4437 | |
e0574cb5 JH |
4438 | /* Terminate the string (for debug), write it, and note that HELO/EHLO |
4439 | has been seen. */ | |
059ec3d9 | 4440 | |
d1a13eea | 4441 | #ifdef SUPPORT_TLS |
e0574cb5 | 4442 | if (tls_in.active.sock >= 0) (void)tls_write(NULL, g->s, g->ptr, FALSE); else |
d1a13eea | 4443 | #endif |
059ec3d9 | 4444 | |
e0574cb5 JH |
4445 | { |
4446 | int i = fwrite(g->s, 1, g->ptr, smtp_out); i = i; /* compiler quietening */ | |
4447 | } | |
4448 | DEBUG(D_receive) | |
4449 | { | |
4450 | uschar *cr; | |
acec9514 | 4451 | |
e0574cb5 JH |
4452 | (void) string_from_gstring(g); |
4453 | while ((cr = Ustrchr(g->s, '\r')) != NULL) /* lose CRs */ | |
4454 | memmove(cr, cr + 1, (g->ptr--) - (cr - g->s)); | |
4455 | debug_printf("SMTP>> %s", g->s); | |
4456 | } | |
88752192 | 4457 | fl.helo_seen = TRUE; |
4e88a19f | 4458 | |
e0574cb5 JH |
4459 | /* Reset the protocol and the state, abandoning any previous message. */ |
4460 | received_protocol = | |
4461 | (sender_host_address ? protocols : protocols_local) | |
88752192 | 4462 | [ (fl.esmtp |
e0574cb5 JH |
4463 | ? pextend + (sender_host_authenticated ? pauthed : 0) |
4464 | : pnormal) | |
4465 | + (tls_in.active.sock >= 0 ? pcrpted : 0) | |
4466 | ]; | |
4467 | cancel_cutthrough_connection(TRUE, US"sent EHLO response"); | |
4468 | smtp_reset(reset_point); | |
4469 | toomany = FALSE; | |
4470 | break; /* HELO/EHLO */ | |
059ec3d9 PH |
4471 | |
4472 | ||
4473 | /* The MAIL command requires an address as an operand. All we do | |
4474 | here is to parse it for syntactic correctness. The form "<>" is | |
4475 | a special case which converts into an empty string. The start/end | |
4476 | pointers in the original are not used further for this address, as | |
4477 | it is the canonical extracted address which is all that is kept. */ | |
4478 | ||
4479 | case MAIL_CMD: | |
e0574cb5 JH |
4480 | HAD(SCH_MAIL); |
4481 | smtp_mailcmd_count++; /* Count for limit and ratelimit */ | |
4482 | was_rej_mail = TRUE; /* Reset if accepted */ | |
4483 | env_mail_type_t * mail_args; /* Sanity check & validate args */ | |
059ec3d9 | 4484 | |
88752192 | 4485 | if (fl.helo_required && !fl.helo_seen) |
e0574cb5 JH |
4486 | { |
4487 | smtp_printf("503 HELO or EHLO required\r\n", FALSE); | |
4488 | log_write(0, LOG_MAIN|LOG_REJECT, "rejected MAIL from %s: no " | |
4489 | "HELO/EHLO given", host_and_ident(FALSE)); | |
4490 | break; | |
4491 | } | |
059ec3d9 | 4492 | |
e0574cb5 JH |
4493 | if (sender_address) |
4494 | { | |
4495 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
4496 | US"sender already given"); | |
4497 | break; | |
4498 | } | |
059ec3d9 | 4499 | |
e0574cb5 JH |
4500 | if (!*smtp_cmd_data) |
4501 | { | |
4502 | done = synprot_error(L_smtp_protocol_error, 501, NULL, | |
4503 | US"MAIL must have an address operand"); | |
4504 | break; | |
4505 | } | |
059ec3d9 | 4506 | |
e0574cb5 JH |
4507 | /* Check to see if the limit for messages per connection would be |
4508 | exceeded by accepting further messages. */ | |
059ec3d9 | 4509 | |
e0574cb5 JH |
4510 | if (smtp_accept_max_per_connection > 0 && |
4511 | smtp_mailcmd_count > smtp_accept_max_per_connection) | |
4512 | { | |
4513 | smtp_printf("421 too many messages in this connection\r\n", FALSE); | |
4514 | log_write(0, LOG_MAIN|LOG_REJECT, "rejected MAIL command %s: too many " | |
4515 | "messages in one connection", host_and_ident(TRUE)); | |
4516 | break; | |
4517 | } | |
059ec3d9 | 4518 | |
e0574cb5 JH |
4519 | /* Reset for start of message - even if this is going to fail, we |
4520 | obviously need to throw away any previous data. */ | |
059ec3d9 | 4521 | |
e0574cb5 JH |
4522 | cancel_cutthrough_connection(TRUE, US"MAIL received"); |
4523 | smtp_reset(reset_point); | |
4524 | toomany = FALSE; | |
4525 | sender_data = recipient_data = NULL; | |
059ec3d9 | 4526 | |
e0574cb5 | 4527 | /* Loop, checking for ESMTP additions to the MAIL FROM command. */ |
059ec3d9 | 4528 | |
88752192 | 4529 | if (fl.esmtp) for(;;) |
e0574cb5 JH |
4530 | { |
4531 | uschar *name, *value, *end; | |
4532 | unsigned long int size; | |
4533 | BOOL arg_error = FALSE; | |
059ec3d9 | 4534 | |
e0574cb5 | 4535 | if (!extract_option(&name, &value)) break; |
059ec3d9 | 4536 | |
e0574cb5 JH |
4537 | for (mail_args = env_mail_type_list; |
4538 | mail_args->value != ENV_MAIL_OPT_NULL; | |
4539 | mail_args++ | |
4540 | ) | |
4541 | if (strcmpic(name, mail_args->name) == 0) | |
4542 | break; | |
4543 | if (mail_args->need_value && strcmpic(value, US"") == 0) | |
4544 | break; | |
059ec3d9 | 4545 | |
e0574cb5 JH |
4546 | switch(mail_args->value) |
4547 | { | |
4548 | /* Handle SIZE= by reading the value. We don't do the check till later, | |
4549 | in order to be able to log the sender address on failure. */ | |
4550 | case ENV_MAIL_OPT_SIZE: | |
4551 | if (((size = Ustrtoul(value, &end, 10)), *end == 0)) | |
9d4319df | 4552 | { |
e0574cb5 JH |
4553 | if ((size == ULONG_MAX && errno == ERANGE) || size > INT_MAX) |
4554 | size = INT_MAX; | |
4555 | message_size = (int)size; | |
4556 | } | |
4557 | else | |
4558 | arg_error = TRUE; | |
4559 | break; | |
4560 | ||
4561 | /* If this session was initiated with EHLO and accept_8bitmime is set, | |
4562 | Exim will have indicated that it supports the BODY=8BITMIME option. In | |
4563 | fact, it does not support this according to the RFCs, in that it does not | |
4564 | take any special action for forwarding messages containing 8-bit | |
4565 | characters. That is why accept_8bitmime is not the default setting, but | |
4566 | some sites want the action that is provided. We recognize both "8BITMIME" | |
4567 | and "7BIT" as body types, but take no action. */ | |
4568 | case ENV_MAIL_OPT_BODY: | |
4569 | if (accept_8bitmime) { | |
4570 | if (strcmpic(value, US"8BITMIME") == 0) | |
4571 | body_8bitmime = 8; | |
4572 | else if (strcmpic(value, US"7BIT") == 0) | |
4573 | body_8bitmime = 7; | |
4574 | else | |
4575 | { | |
4576 | body_8bitmime = 0; | |
4577 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4578 | US"invalid data for BODY"); | |
4579 | goto COMMAND_LOOP; | |
4580 | } | |
4581 | DEBUG(D_receive) debug_printf("8BITMIME: %d\n", body_8bitmime); | |
4582 | break; | |
4583 | } | |
4584 | arg_error = TRUE; | |
3c0a92dc | 4585 | break; |
059ec3d9 | 4586 | |
e0574cb5 JH |
4587 | /* Handle the two DSN options, but only if configured to do so (which |
4588 | will have caused "DSN" to be given in the EHLO response). The code itself | |
4589 | is included only if configured in at build time. */ | |
6c1c3d1d | 4590 | |
e0574cb5 | 4591 | case ENV_MAIL_OPT_RET: |
88752192 | 4592 | if (fl.dsn_advertised) |
9d4319df | 4593 | { |
e0574cb5 JH |
4594 | /* Check if RET has already been set */ |
4595 | if (dsn_ret > 0) | |
4596 | { | |
4597 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4598 | US"RET can be specified once only"); | |
4599 | goto COMMAND_LOOP; | |
4600 | } | |
4601 | dsn_ret = strcmpic(value, US"HDRS") == 0 | |
4602 | ? dsn_ret_hdrs | |
4603 | : strcmpic(value, US"FULL") == 0 | |
4604 | ? dsn_ret_full | |
4605 | : 0; | |
4606 | DEBUG(D_receive) debug_printf("DSN_RET: %d\n", dsn_ret); | |
4607 | /* Check for invalid invalid value, and exit with error */ | |
4608 | if (dsn_ret == 0) | |
4609 | { | |
4610 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4611 | US"Value for RET is invalid"); | |
4612 | goto COMMAND_LOOP; | |
4613 | } | |
9d4319df | 4614 | } |
e0574cb5 JH |
4615 | break; |
4616 | case ENV_MAIL_OPT_ENVID: | |
88752192 | 4617 | if (fl.dsn_advertised) |
9d4319df | 4618 | { |
e0574cb5 JH |
4619 | /* Check if the dsn envid has been already set */ |
4620 | if (dsn_envid) | |
4621 | { | |
4622 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4623 | US"ENVID can be specified once only"); | |
4624 | goto COMMAND_LOOP; | |
4625 | } | |
4626 | dsn_envid = string_copy(value); | |
4627 | DEBUG(D_receive) debug_printf("DSN_ENVID: %s\n", dsn_envid); | |
9d4319df | 4628 | } |
e0574cb5 | 4629 | break; |
059ec3d9 | 4630 | |
e0574cb5 JH |
4631 | /* Handle the AUTH extension. If the value given is not "<>" and either |
4632 | the ACL says "yes" or there is no ACL but the sending host is | |
4633 | authenticated, we set it up as the authenticated sender. However, if the | |
4634 | authenticator set a condition to be tested, we ignore AUTH on MAIL unless | |
4635 | the condition is met. The value of AUTH is an xtext, which means that +, | |
4636 | = and cntrl chars are coded in hex; however "<>" is unaffected by this | |
4637 | coding. */ | |
4638 | case ENV_MAIL_OPT_AUTH: | |
4639 | if (Ustrcmp(value, "<>") != 0) | |
4640 | { | |
4641 | int rc; | |
4642 | uschar *ignore_msg; | |
94431adb | 4643 | |
e0574cb5 JH |
4644 | if (auth_xtextdecode(value, &authenticated_sender) < 0) |
4645 | { | |
4646 | /* Put back terminator overrides for error message */ | |
9d4319df JH |
4647 | value[-1] = '='; |
4648 | name[-1] = ' '; | |
e0574cb5 JH |
4649 | done = synprot_error(L_smtp_syntax_error, 501, NULL, |
4650 | US"invalid data for AUTH"); | |
9d4319df | 4651 | goto COMMAND_LOOP; |
e0574cb5 JH |
4652 | } |
4653 | if (!acl_smtp_mailauth) | |
4654 | { | |
4655 | ignore_msg = US"client not authenticated"; | |
4656 | rc = sender_host_authenticated ? OK : FAIL; | |
4657 | } | |
4658 | else | |
4659 | { | |
4660 | ignore_msg = US"rejected by ACL"; | |
4661 | rc = acl_check(ACL_WHERE_MAILAUTH, NULL, acl_smtp_mailauth, | |
4662 | &user_msg, &log_msg); | |
4663 | } | |
4664 | ||
4665 | switch (rc) | |
4666 | { | |
4667 | case OK: | |
4668 | if (authenticated_by == NULL || | |
4669 | authenticated_by->mail_auth_condition == NULL || | |
4670 | expand_check_condition(authenticated_by->mail_auth_condition, | |
4671 | authenticated_by->name, US"authenticator")) | |
4672 | break; /* Accept the AUTH */ | |
4673 | ||
4674 | ignore_msg = US"server_mail_auth_condition failed"; | |
4675 | if (authenticated_id != NULL) | |
4676 | ignore_msg = string_sprintf("%s: authenticated ID=\"%s\"", | |
4677 | ignore_msg, authenticated_id); | |
4678 | ||
4679 | /* Fall through */ | |
4680 | ||
4681 | case FAIL: | |
4682 | authenticated_sender = NULL; | |
4683 | log_write(0, LOG_MAIN, "ignoring AUTH=%s from %s (%s)", | |
4684 | value, host_and_ident(TRUE), ignore_msg); | |
4685 | break; | |
4686 | ||
4687 | /* Should only get DEFER or ERROR here. Put back terminator | |
4688 | overrides for error message */ | |
4689 | ||
4690 | default: | |
4691 | value[-1] = '='; | |
4692 | name[-1] = ' '; | |
4693 | (void)smtp_handle_acl_fail(ACL_WHERE_MAILAUTH, rc, user_msg, | |
4694 | log_msg); | |
4695 | goto COMMAND_LOOP; | |
4696 | } | |
4697 | } | |
4698 | break; | |
fd98a5c6 | 4699 | |
8ccd00b1 | 4700 | #ifndef DISABLE_PRDR |
e0574cb5 JH |
4701 | case ENV_MAIL_OPT_PRDR: |
4702 | if (prdr_enable) | |
4703 | prdr_requested = TRUE; | |
4704 | break; | |
fd98a5c6 JH |
4705 | #endif |
4706 | ||
8c5d388a | 4707 | #ifdef SUPPORT_I18N |
e0574cb5 | 4708 | case ENV_MAIL_OPT_UTF8: |
88752192 | 4709 | if (!fl.smtputf8_advertised) |
e0574cb5 JH |
4710 | { |
4711 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4712 | US"SMTPUTF8 used when not advertised"); | |
4713 | goto COMMAND_LOOP; | |
4714 | } | |
8c34c611 | 4715 | |
e0574cb5 JH |
4716 | DEBUG(D_receive) debug_printf("smtputf8 requested\n"); |
4717 | message_smtputf8 = allow_utf8_domains = TRUE; | |
4718 | if (Ustrncmp(received_protocol, US"utf8", 4) != 0) | |
4719 | { | |
4720 | int old_pool = store_pool; | |
4721 | store_pool = POOL_PERM; | |
4722 | received_protocol = string_sprintf("utf8%s", received_protocol); | |
4723 | store_pool = old_pool; | |
4724 | } | |
4725 | break; | |
d1a13eea | 4726 | #endif |
8ac90765 JH |
4727 | |
4728 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS) | |
e0574cb5 | 4729 | case ENV_MAIL_OPT_REQTLS: |
8ac90765 | 4730 | { |
e0574cb5 JH |
4731 | uschar * r, * t; |
4732 | ||
88752192 | 4733 | if (!fl.requiretls_advertised) |
e0574cb5 JH |
4734 | { |
4735 | done = synprot_error(L_smtp_syntax_error, 555, NULL, | |
4736 | US"unadvertised MAIL option: REQUIRETLS"); | |
4737 | goto COMMAND_LOOP; | |
4738 | } | |
8ac90765 | 4739 | |
e0574cb5 JH |
4740 | DEBUG(D_receive) debug_printf("requiretls requested\n"); |
4741 | tls_requiretls = REQUIRETLS_MSG; | |
8ac90765 | 4742 | |
e0574cb5 JH |
4743 | r = string_copy_malloc(received_protocol); |
4744 | if ((t = Ustrrchr(r, 's'))) *t = 'S'; | |
4745 | received_protocol = r; | |
4746 | } | |
4747 | break; | |
8ac90765 JH |
4748 | #endif |
4749 | ||
e0574cb5 JH |
4750 | /* No valid option. Stick back the terminator characters and break |
4751 | the loop. Do the name-terminator second as extract_option sets | |
4752 | value==name when it found no equal-sign. | |
4753 | An error for a malformed address will occur. */ | |
4754 | case ENV_MAIL_OPT_NULL: | |
4755 | value[-1] = '='; | |
4756 | name[-1] = ' '; | |
4757 | arg_error = TRUE; | |
4758 | break; | |
2ef7ed08 | 4759 | |
e0574cb5 JH |
4760 | default: assert(0); |
4761 | } | |
4762 | /* Break out of for loop if switch() had bad argument or | |
4763 | when start of the email address is reached */ | |
4764 | if (arg_error) break; | |
4765 | } | |
059ec3d9 | 4766 | |
8ac90765 | 4767 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS) |
e0574cb5 JH |
4768 | if (tls_requiretls & REQUIRETLS_MSG) |
4769 | { | |
4770 | /* Ensure headers-only bounces whether a RET option was given or not. */ | |
8ac90765 | 4771 | |
e0574cb5 JH |
4772 | DEBUG(D_receive) if (dsn_ret == dsn_ret_full) |
4773 | debug_printf("requiretls override: dsn_ret_full -> dsn_ret_hdrs\n"); | |
4774 | dsn_ret = dsn_ret_hdrs; | |
4775 | } | |
8ac90765 JH |
4776 | #endif |
4777 | ||
e0574cb5 JH |
4778 | /* If we have passed the threshold for rate limiting, apply the current |
4779 | delay, and update it for next time, provided this is a limited host. */ | |
059ec3d9 | 4780 | |
e0574cb5 JH |
4781 | if (smtp_mailcmd_count > smtp_rlm_threshold && |
4782 | verify_check_host(&smtp_ratelimit_hosts) == OK) | |
4783 | { | |
4784 | DEBUG(D_receive) debug_printf("rate limit MAIL: delay %.3g sec\n", | |
4785 | smtp_delay_mail/1000.0); | |
4786 | millisleep((int)smtp_delay_mail); | |
4787 | smtp_delay_mail *= smtp_rlm_factor; | |
4788 | if (smtp_delay_mail > (double)smtp_rlm_limit) | |
4789 | smtp_delay_mail = (double)smtp_rlm_limit; | |
4790 | } | |
059ec3d9 | 4791 | |
e0574cb5 JH |
4792 | /* Now extract the address, first applying any SMTP-time rewriting. The |
4793 | TRUE flag allows "<>" as a sender address. */ | |
059ec3d9 | 4794 | |
e0574cb5 JH |
4795 | raw_sender = rewrite_existflags & rewrite_smtp |
4796 | ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"", | |
4797 | global_rewrite_rules) | |
4798 | : smtp_cmd_data; | |
059ec3d9 | 4799 | |
e0574cb5 JH |
4800 | raw_sender = |
4801 | parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain, | |
4802 | TRUE); | |
059ec3d9 | 4803 | |
e0574cb5 JH |
4804 | if (!raw_sender) |
4805 | { | |
4806 | done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess); | |
4807 | break; | |
4808 | } | |
059ec3d9 | 4809 | |
e0574cb5 | 4810 | sender_address = raw_sender; |
059ec3d9 | 4811 | |
e0574cb5 JH |
4812 | /* If there is a configured size limit for mail, check that this message |
4813 | doesn't exceed it. The check is postponed to this point so that the sender | |
4814 | can be logged. */ | |
059ec3d9 | 4815 | |
e0574cb5 JH |
4816 | if (thismessage_size_limit > 0 && message_size > thismessage_size_limit) |
4817 | { | |
4818 | smtp_printf("552 Message size exceeds maximum permitted\r\n", FALSE); | |
4819 | log_write(L_size_reject, | |
4820 | LOG_MAIN|LOG_REJECT, "rejected MAIL FROM:<%s> %s: " | |
4821 | "message too big: size%s=%d max=%d", | |
4822 | sender_address, | |
4823 | host_and_ident(TRUE), | |
4824 | (message_size == INT_MAX)? ">" : "", | |
4825 | message_size, | |
4826 | thismessage_size_limit); | |
4827 | sender_address = NULL; | |
4828 | break; | |
4829 | } | |
059ec3d9 | 4830 | |
e0574cb5 JH |
4831 | /* Check there is enough space on the disk unless configured not to. |
4832 | When smtp_check_spool_space is set, the check is for thismessage_size_limit | |
4833 | plus the current message - i.e. we accept the message only if it won't | |
4834 | reduce the space below the threshold. Add 5000 to the size to allow for | |
4835 | overheads such as the Received: line and storing of recipients, etc. | |
4836 | By putting the check here, even when SIZE is not given, it allow VRFY | |
4837 | and EXPN etc. to be used when space is short. */ | |
4838 | ||
4839 | if (!receive_check_fs( | |
4840 | (smtp_check_spool_space && message_size >= 0)? | |
4841 | message_size + 5000 : 0)) | |
4842 | { | |
4843 | smtp_printf("452 Space shortage, please try later\r\n", FALSE); | |
4844 | sender_address = NULL; | |
4845 | break; | |
4846 | } | |
059ec3d9 | 4847 | |
e0574cb5 JH |
4848 | /* If sender_address is unqualified, reject it, unless this is a locally |
4849 | generated message, or the sending host or net is permitted to send | |
4850 | unqualified addresses - typically local machines behaving as MUAs - | |
4851 | in which case just qualify the address. The flag is set above at the start | |
4852 | of the SMTP connection. */ | |
059ec3d9 | 4853 | |
e0574cb5 | 4854 | if (!sender_domain && *sender_address) |
8768d548 | 4855 | if (f.allow_unqualified_sender) |
e0574cb5 JH |
4856 | { |
4857 | sender_domain = Ustrlen(sender_address) + 1; | |
4858 | sender_address = rewrite_address_qualify(sender_address, FALSE); | |
4859 | DEBUG(D_receive) debug_printf("unqualified address %s accepted\n", | |
4860 | raw_sender); | |
4861 | } | |
4862 | else | |
4863 | { | |
4864 | smtp_printf("501 %s: sender address must contain a domain\r\n", FALSE, | |
4865 | smtp_cmd_data); | |
4866 | log_write(L_smtp_syntax_error, | |
4867 | LOG_MAIN|LOG_REJECT, | |
4868 | "unqualified sender rejected: <%s> %s%s", | |
4869 | raw_sender, | |
4870 | host_and_ident(TRUE), | |
4871 | host_lookup_msg); | |
4872 | sender_address = NULL; | |
4873 | break; | |
4874 | } | |
059ec3d9 | 4875 | |
e0574cb5 JH |
4876 | /* Apply an ACL check if one is defined, before responding. Afterwards, |
4877 | when pipelining is not advertised, do another sync check in case the ACL | |
4878 | delayed and the client started sending in the meantime. */ | |
059ec3d9 | 4879 | |
e0574cb5 JH |
4880 | if (acl_smtp_mail) |
4881 | { | |
4882 | rc = acl_check(ACL_WHERE_MAIL, NULL, acl_smtp_mail, &user_msg, &log_msg); | |
8768d548 | 4883 | if (rc == OK && !f.smtp_in_pipelining_advertised && !check_sync()) |
e0574cb5 JH |
4884 | goto SYNC_FAILURE; |
4885 | } | |
4886 | else | |
4887 | rc = OK; | |
925ac8e4 | 4888 | |
e0574cb5 JH |
4889 | if (rc == OK || rc == DISCARD) |
4890 | { | |
4891 | BOOL more = pipeline_response(); | |
4892 | ||
4893 | if (!user_msg) | |
4894 | smtp_printf("%s%s%s", more, US"250 OK", | |
4895 | #ifndef DISABLE_PRDR | |
4896 | prdr_requested ? US", PRDR Requested" : US"", | |
4897 | #else | |
4898 | US"", | |
4899 | #endif | |
4900 | US"\r\n"); | |
4901 | else | |
4902 | { | |
4903 | #ifndef DISABLE_PRDR | |
4904 | if (prdr_requested) | |
4905 | user_msg = string_sprintf("%s%s", user_msg, US", PRDR Requested"); | |
4906 | #endif | |
4907 | smtp_user_msg(US"250", user_msg); | |
4908 | } | |
4909 | smtp_delay_rcpt = smtp_rlr_base; | |
8768d548 | 4910 | f.recipients_discarded = (rc == DISCARD); |
e0574cb5 JH |
4911 | was_rej_mail = FALSE; |
4912 | } | |
94431adb | 4913 | else |
e0574cb5 JH |
4914 | { |
4915 | done = smtp_handle_acl_fail(ACL_WHERE_MAIL, rc, user_msg, log_msg); | |
4916 | sender_address = NULL; | |
4917 | } | |
4918 | break; | |
059ec3d9 PH |
4919 | |
4920 | ||
2679d413 PH |
4921 | /* The RCPT command requires an address as an operand. There may be any |
4922 | number of RCPT commands, specifying multiple recipients. We build them all | |
4923 | into a data structure. The start/end values given by parse_extract_address | |
4924 | are not used, as we keep only the extracted address. */ | |
059ec3d9 PH |
4925 | |
4926 | case RCPT_CMD: | |
e0574cb5 JH |
4927 | HAD(SCH_RCPT); |
4928 | rcpt_count++; | |
88752192 | 4929 | was_rcpt = fl.rcpt_in_progress = TRUE; |
059ec3d9 | 4930 | |
e0574cb5 JH |
4931 | /* There must be a sender address; if the sender was rejected and |
4932 | pipelining was advertised, we assume the client was pipelining, and do not | |
4933 | count this as a protocol error. Reset was_rej_mail so that further RCPTs | |
4934 | get the same treatment. */ | |
059ec3d9 | 4935 | |
e0574cb5 JH |
4936 | if (sender_address == NULL) |
4937 | { | |
8768d548 | 4938 | if (f.smtp_in_pipelining_advertised && last_was_rej_mail) |
e0574cb5 JH |
4939 | { |
4940 | smtp_printf("503 sender not yet given\r\n", FALSE); | |
4941 | was_rej_mail = TRUE; | |
4942 | } | |
4943 | else | |
4944 | { | |
4945 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
4946 | US"sender not yet given"); | |
4947 | was_rcpt = FALSE; /* Not a valid RCPT */ | |
4948 | } | |
4949 | rcpt_fail_count++; | |
4950 | break; | |
4951 | } | |
059ec3d9 | 4952 | |
e0574cb5 | 4953 | /* Check for an operand */ |
059ec3d9 | 4954 | |
e0574cb5 JH |
4955 | if (smtp_cmd_data[0] == 0) |
4956 | { | |
4957 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4958 | US"RCPT must have an address operand"); | |
4959 | rcpt_fail_count++; | |
4960 | break; | |
4961 | } | |
50dc7409 | 4962 | |
e0574cb5 JH |
4963 | /* Set the DSN flags orcpt and dsn_flags from the session*/ |
4964 | orcpt = NULL; | |
ea97267c | 4965 | dsn_flags = 0; |
6c1c3d1d | 4966 | |
88752192 | 4967 | if (fl.esmtp) for(;;) |
e0574cb5 JH |
4968 | { |
4969 | uschar *name, *value; | |
6c1c3d1d | 4970 | |
e0574cb5 JH |
4971 | if (!extract_option(&name, &value)) |
4972 | break; | |
6c1c3d1d | 4973 | |
88752192 | 4974 | if (fl.dsn_advertised && strcmpic(name, US"ORCPT") == 0) |
45500060 | 4975 | { |
e0574cb5 JH |
4976 | /* Check whether orcpt has been already set */ |
4977 | if (orcpt) | |
4978 | { | |
4979 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4980 | US"ORCPT can be specified once only"); | |
4981 | goto COMMAND_LOOP; | |
4982 | } | |
4983 | orcpt = string_copy(value); | |
4984 | DEBUG(D_receive) debug_printf("DSN orcpt: %s\n", orcpt); | |
4985 | } | |
6c1c3d1d | 4986 | |
88752192 | 4987 | else if (fl.dsn_advertised && strcmpic(name, US"NOTIFY") == 0) |
45500060 | 4988 | { |
e0574cb5 | 4989 | /* Check if the notify flags have been already set */ |
ea97267c | 4990 | if (dsn_flags > 0) |
e0574cb5 JH |
4991 | { |
4992 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4993 | US"NOTIFY can be specified once only"); | |
4994 | goto COMMAND_LOOP; | |
4995 | } | |
4996 | if (strcmpic(value, US"NEVER") == 0) | |
ea97267c | 4997 | dsn_flags |= rf_notify_never; |
e0574cb5 JH |
4998 | else |
4999 | { | |
5000 | uschar *p = value; | |
5001 | while (*p != 0) | |
45500060 | 5002 | { |
e0574cb5 JH |
5003 | uschar *pp = p; |
5004 | while (*pp != 0 && *pp != ',') pp++; | |
5005 | if (*pp == ',') *pp++ = 0; | |
5006 | if (strcmpic(p, US"SUCCESS") == 0) | |
5007 | { | |
5008 | DEBUG(D_receive) debug_printf("DSN: Setting notify success\n"); | |
ea97267c | 5009 | dsn_flags |= rf_notify_success; |
e0574cb5 JH |
5010 | } |
5011 | else if (strcmpic(p, US"FAILURE") == 0) | |
5012 | { | |
5013 | DEBUG(D_receive) debug_printf("DSN: Setting notify failure\n"); | |
ea97267c | 5014 | dsn_flags |= rf_notify_failure; |
e0574cb5 JH |
5015 | } |
5016 | else if (strcmpic(p, US"DELAY") == 0) | |
5017 | { | |
5018 | DEBUG(D_receive) debug_printf("DSN: Setting notify delay\n"); | |
ea97267c | 5019 | dsn_flags |= rf_notify_delay; |
e0574cb5 JH |
5020 | } |
5021 | else | |
5022 | { | |
5023 | /* Catch any strange values */ | |
5024 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
5025 | US"Invalid value for NOTIFY parameter"); | |
5026 | goto COMMAND_LOOP; | |
5027 | } | |
5028 | p = pp; | |
5029 | } | |
ea97267c | 5030 | DEBUG(D_receive) debug_printf("DSN Flags: %x\n", dsn_flags); |
e0574cb5 JH |
5031 | } |
5032 | } | |
6c1c3d1d | 5033 | |
e0574cb5 JH |
5034 | /* Unknown option. Stick back the terminator characters and break |
5035 | the loop. An error for a malformed address will occur. */ | |
6c1c3d1d | 5036 | |
e0574cb5 JH |
5037 | else |
5038 | { | |
5039 | DEBUG(D_receive) debug_printf("Invalid RCPT option: %s : %s\n", name, value); | |
5040 | name[-1] = ' '; | |
5041 | value[-1] = '='; | |
5042 | break; | |
5043 | } | |
5044 | } | |
059ec3d9 | 5045 | |
e0574cb5 JH |
5046 | /* Apply SMTP rewriting then extract the working address. Don't allow "<>" |
5047 | as a recipient address */ | |
059ec3d9 | 5048 | |
e0574cb5 JH |
5049 | recipient = rewrite_existflags & rewrite_smtp |
5050 | ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"", | |
5051 | global_rewrite_rules) | |
5052 | : smtp_cmd_data; | |
059ec3d9 | 5053 | |
e0574cb5 JH |
5054 | if (!(recipient = parse_extract_address(recipient, &errmess, &start, &end, |
5055 | &recipient_domain, FALSE))) | |
5056 | { | |
5057 | done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess); | |
5058 | rcpt_fail_count++; | |
5059 | break; | |
5060 | } | |
059ec3d9 | 5061 | |
e0574cb5 JH |
5062 | /* If the recipient address is unqualified, reject it, unless this is a |
5063 | locally generated message. However, unqualified addresses are permitted | |
5064 | from a configured list of hosts and nets - typically when behaving as | |
5065 | MUAs rather than MTAs. Sad that SMTP is used for both types of traffic, | |
5066 | really. The flag is set at the start of the SMTP connection. | |
059ec3d9 | 5067 | |
e0574cb5 JH |
5068 | RFC 1123 talks about supporting "the reserved mailbox postmaster"; I always |
5069 | assumed this meant "reserved local part", but the revision of RFC 821 and | |
5070 | friends now makes it absolutely clear that it means *mailbox*. Consequently | |
5071 | we must always qualify this address, regardless. */ | |
059ec3d9 | 5072 | |
e0574cb5 JH |
5073 | if (!recipient_domain) |
5074 | if (!(recipient_domain = qualify_recipient(&recipient, smtp_cmd_data, | |
5075 | US"recipient"))) | |
5076 | { | |
5077 | rcpt_fail_count++; | |
5078 | break; | |
5079 | } | |
059ec3d9 | 5080 | |
e0574cb5 | 5081 | /* Check maximum allowed */ |
059ec3d9 | 5082 | |
e0574cb5 JH |
5083 | if (rcpt_count > recipients_max && recipients_max > 0) |
5084 | { | |
5085 | if (recipients_max_reject) | |
5086 | { | |
5087 | rcpt_fail_count++; | |
5088 | smtp_printf("552 too many recipients\r\n", FALSE); | |
5089 | if (!toomany) | |
5090 | log_write(0, LOG_MAIN|LOG_REJECT, "too many recipients: message " | |
5091 | "rejected: sender=<%s> %s", sender_address, host_and_ident(TRUE)); | |
5092 | } | |
5093 | else | |
5094 | { | |
5095 | rcpt_defer_count++; | |
5096 | smtp_printf("452 too many recipients\r\n", FALSE); | |
5097 | if (!toomany) | |
5098 | log_write(0, LOG_MAIN|LOG_REJECT, "too many recipients: excess " | |
5099 | "temporarily rejected: sender=<%s> %s", sender_address, | |
5100 | host_and_ident(TRUE)); | |
5101 | } | |
059ec3d9 | 5102 | |
e0574cb5 JH |
5103 | toomany = TRUE; |
5104 | break; | |
5105 | } | |
059ec3d9 | 5106 | |
e0574cb5 JH |
5107 | /* If we have passed the threshold for rate limiting, apply the current |
5108 | delay, and update it for next time, provided this is a limited host. */ | |
059ec3d9 | 5109 | |
e0574cb5 JH |
5110 | if (rcpt_count > smtp_rlr_threshold && |
5111 | verify_check_host(&smtp_ratelimit_hosts) == OK) | |
5112 | { | |
5113 | DEBUG(D_receive) debug_printf("rate limit RCPT: delay %.3g sec\n", | |
5114 | smtp_delay_rcpt/1000.0); | |
5115 | millisleep((int)smtp_delay_rcpt); | |
5116 | smtp_delay_rcpt *= smtp_rlr_factor; | |
5117 | if (smtp_delay_rcpt > (double)smtp_rlr_limit) | |
5118 | smtp_delay_rcpt = (double)smtp_rlr_limit; | |
5119 | } | |
059ec3d9 | 5120 | |
e0574cb5 JH |
5121 | /* If the MAIL ACL discarded all the recipients, we bypass ACL checking |
5122 | for them. Otherwise, check the access control list for this recipient. As | |
5123 | there may be a delay in this, re-check for a synchronization error | |
5124 | afterwards, unless pipelining was advertised. */ | |
059ec3d9 | 5125 | |
8768d548 | 5126 | if (f.recipients_discarded) |
e0574cb5 JH |
5127 | rc = DISCARD; |
5128 | else | |
5129 | if ( (rc = acl_check(ACL_WHERE_RCPT, recipient, acl_smtp_rcpt, &user_msg, | |
5130 | &log_msg)) == OK | |
8768d548 | 5131 | && !f.smtp_in_pipelining_advertised && !check_sync()) |
e0574cb5 | 5132 | goto SYNC_FAILURE; |
059ec3d9 | 5133 | |
e0574cb5 | 5134 | /* The ACL was happy */ |
059ec3d9 | 5135 | |
e0574cb5 JH |
5136 | if (rc == OK) |
5137 | { | |
5138 | BOOL more = pipeline_response(); | |
925ac8e4 | 5139 | |
e0574cb5 JH |
5140 | if (user_msg) |
5141 | smtp_user_msg(US"250", user_msg); | |
5142 | else | |
5143 | smtp_printf("250 Accepted\r\n", more); | |
5144 | receive_add_recipient(recipient, -1); | |
94431adb | 5145 | |
e0574cb5 JH |
5146 | /* Set the dsn flags in the recipients_list */ |
5147 | recipients_list[recipients_count-1].orcpt = orcpt; | |
ea97267c | 5148 | recipients_list[recipients_count-1].dsn_flags = dsn_flags; |
6c1c3d1d | 5149 | |
e0574cb5 JH |
5150 | DEBUG(D_receive) debug_printf("DSN: orcpt: %s flags: %d\n", |
5151 | recipients_list[recipients_count-1].orcpt, | |
5152 | recipients_list[recipients_count-1].dsn_flags); | |
5153 | } | |
059ec3d9 | 5154 | |
e0574cb5 | 5155 | /* The recipient was discarded */ |
059ec3d9 | 5156 | |
e0574cb5 JH |
5157 | else if (rc == DISCARD) |
5158 | { | |
5159 | if (user_msg) | |
5160 | smtp_user_msg(US"250", user_msg); | |
5161 | else | |
5162 | smtp_printf("250 Accepted\r\n", FALSE); | |
5163 | rcpt_fail_count++; | |
5164 | discarded = TRUE; | |
5165 | log_write(0, LOG_MAIN|LOG_REJECT, "%s F=<%s> RCPT %s: " | |
5166 | "discarded by %s ACL%s%s", host_and_ident(TRUE), | |
5167 | sender_address_unrewritten? sender_address_unrewritten : sender_address, | |
8768d548 | 5168 | smtp_cmd_argument, f.recipients_discarded? "MAIL" : "RCPT", |
e0574cb5 JH |
5169 | log_msg ? US": " : US"", log_msg ? log_msg : US""); |
5170 | } | |
059ec3d9 | 5171 | |
e0574cb5 | 5172 | /* Either the ACL failed the address, or it was deferred. */ |
059ec3d9 | 5173 | |
e0574cb5 JH |
5174 | else |
5175 | { | |
5176 | if (rc == FAIL) rcpt_fail_count++; else rcpt_defer_count++; | |
5177 | done = smtp_handle_acl_fail(ACL_WHERE_RCPT, rc, user_msg, log_msg); | |
5178 | } | |
5179 | break; | |
059ec3d9 PH |
5180 | |
5181 | ||
5182 | /* The DATA command is legal only if it follows successful MAIL FROM | |
5183 | and RCPT TO commands. However, if pipelining is advertised, a bad DATA is | |
5184 | not counted as a protocol error if it follows RCPT (which must have been | |
5185 | rejected if there are no recipients.) This function is complete when a | |
5186 | valid DATA command is encountered. | |
5187 | ||
5188 | Note concerning the code used: RFC 2821 says this: | |
5189 | ||
5190 | - If there was no MAIL, or no RCPT, command, or all such commands | |
5191 | were rejected, the server MAY return a "command out of sequence" | |
5192 | (503) or "no valid recipients" (554) reply in response to the | |
5193 | DATA command. | |
5194 | ||
5195 | The example in the pipelining RFC 2920 uses 554, but I use 503 here | |
2679d413 PH |
5196 | because it is the same whether pipelining is in use or not. |
5197 | ||
5198 | If all the RCPT commands that precede DATA provoked the same error message | |
5199 | (often indicating some kind of system error), it is helpful to include it | |
5200 | with the DATA rejection (an idea suggested by Tony Finch). */ | |
059ec3d9 | 5201 | |
18481de3 | 5202 | case BDAT_CMD: |
18481de3 JH |
5203 | { |
5204 | int n; | |
5205 | ||
e0574cb5 | 5206 | HAD(SCH_BDAT); |
18481de3 JH |
5207 | if (chunking_state != CHUNKING_OFFERED) |
5208 | { | |
5209 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
5210 | US"BDAT command used when CHUNKING not advertised"); | |
5211 | break; | |
5212 | } | |
5213 | ||
5214 | /* grab size, endmarker */ | |
5215 | ||
5216 | if (sscanf(CS smtp_cmd_data, "%u %n", &chunking_datasize, &n) < 1) | |
5217 | { | |
7e3ce68e | 5218 | done = synprot_error(L_smtp_protocol_error, 501, NULL, |
18481de3 JH |
5219 | US"missing size for BDAT command"); |
5220 | break; | |
5221 | } | |
5222 | chunking_state = strcmpic(smtp_cmd_data+n, US"LAST") == 0 | |
5223 | ? CHUNKING_LAST : CHUNKING_ACTIVE; | |
7e3ce68e | 5224 | chunking_data_left = chunking_datasize; |
bd8fbe36 JH |
5225 | DEBUG(D_receive) debug_printf("chunking state %d, %d bytes\n", |
5226 | (int)chunking_state, chunking_data_left); | |
7e3ce68e | 5227 | |
527504e8 HSHR |
5228 | /* push the current receive_* function on the "stack", and |
5229 | replace them by bdat_getc(), which in turn will use the lwr_receive_* | |
5230 | functions to do the dirty work. */ | |
7e3ce68e | 5231 | lwr_receive_getc = receive_getc; |
0d81dabc | 5232 | lwr_receive_getbuf = receive_getbuf; |
7e3ce68e | 5233 | lwr_receive_ungetc = receive_ungetc; |
527504e8 | 5234 | |
7e3ce68e JH |
5235 | receive_getc = bdat_getc; |
5236 | receive_ungetc = bdat_ungetc; | |
18481de3 | 5237 | |
8768d548 | 5238 | f.dot_ends = FALSE; |
527504e8 | 5239 | |
18481de3 JH |
5240 | goto DATA_BDAT; |
5241 | } | |
5242 | ||
059ec3d9 | 5243 | case DATA_CMD: |
e0574cb5 | 5244 | HAD(SCH_DATA); |
8768d548 | 5245 | f.dot_ends = TRUE; |
45bd315d | 5246 | |
e0574cb5 JH |
5247 | DATA_BDAT: /* Common code for DATA and BDAT */ |
5248 | if (!discarded && recipients_count <= 0) | |
5249 | { | |
88752192 | 5250 | if (fl.rcpt_smtp_response_same && rcpt_smtp_response != NULL) |
e0574cb5 JH |
5251 | { |
5252 | uschar *code = US"503"; | |
5253 | int len = Ustrlen(rcpt_smtp_response); | |
5254 | smtp_respond(code, 3, FALSE, US"All RCPT commands were rejected with " | |
5255 | "this error:"); | |
5256 | /* Responses from smtp_printf() will have \r\n on the end */ | |
5257 | if (len > 2 && rcpt_smtp_response[len-2] == '\r') | |
5258 | rcpt_smtp_response[len-2] = 0; | |
5259 | smtp_respond(code, 3, FALSE, rcpt_smtp_response); | |
5260 | } | |
8768d548 | 5261 | if (f.smtp_in_pipelining_advertised && last_was_rcpt) |
e0574cb5 JH |
5262 | smtp_printf("503 Valid RCPT command must precede %s\r\n", FALSE, |
5263 | smtp_names[smtp_connection_had[smtp_ch_index-1]]); | |
5264 | else | |
5265 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
5266 | smtp_connection_had[smtp_ch_index-1] == SCH_DATA | |
5267 | ? US"valid RCPT command must precede DATA" | |
5268 | : US"valid RCPT command must precede BDAT"); | |
059ec3d9 | 5269 | |
e0574cb5 JH |
5270 | if (chunking_state > CHUNKING_OFFERED) |
5271 | bdat_flush_data(); | |
5272 | break; | |
5273 | } | |
8e669ac1 | 5274 | |
e0574cb5 JH |
5275 | if (toomany && recipients_max_reject) |
5276 | { | |
5277 | sender_address = NULL; /* This will allow a new MAIL without RSET */ | |
5278 | sender_address_unrewritten = NULL; | |
5279 | smtp_printf("554 Too many recipients\r\n", FALSE); | |
5280 | break; | |
5281 | } | |
059ec3d9 | 5282 | |
e0574cb5 JH |
5283 | if (chunking_state > CHUNKING_OFFERED) |
5284 | rc = OK; /* No predata ACL or go-ahead output for BDAT */ | |
7e3ce68e JH |
5285 | else |
5286 | { | |
e0574cb5 JH |
5287 | /* If there is an ACL, re-check the synchronization afterwards, since the |
5288 | ACL may have delayed. To handle cutthrough delivery enforce a dummy call | |
5289 | to get the DATA command sent. */ | |
7e3ce68e | 5290 | |
e0574cb5 JH |
5291 | if (acl_smtp_predata == NULL && cutthrough.cctx.sock < 0) |
5292 | rc = OK; | |
5293 | else | |
5294 | { | |
5295 | uschar * acl = acl_smtp_predata ? acl_smtp_predata : US"accept"; | |
8768d548 | 5296 | f.enable_dollar_recipients = TRUE; |
e0574cb5 JH |
5297 | rc = acl_check(ACL_WHERE_PREDATA, NULL, acl, &user_msg, |
5298 | &log_msg); | |
8768d548 | 5299 | f.enable_dollar_recipients = FALSE; |
e0574cb5 JH |
5300 | if (rc == OK && !check_sync()) |
5301 | goto SYNC_FAILURE; | |
5302 | ||
5303 | if (rc != OK) | |
5304 | { /* Either the ACL failed the address, or it was deferred. */ | |
5305 | done = smtp_handle_acl_fail(ACL_WHERE_PREDATA, rc, user_msg, log_msg); | |
5306 | break; | |
5307 | } | |
7e3ce68e | 5308 | } |
7e3ce68e | 5309 | |
e0574cb5 JH |
5310 | if (user_msg) |
5311 | smtp_user_msg(US"354", user_msg); | |
5312 | else | |
5313 | smtp_printf( | |
5314 | "354 Enter message, ending with \".\" on a line by itself\r\n", FALSE); | |
5315 | } | |
059ec3d9 | 5316 | |
8d330698 | 5317 | #ifdef TCP_QUICKACK |
e0574cb5 JH |
5318 | if (smtp_in) /* all ACKs needed to ramp window up for bulk data */ |
5319 | (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK, | |
5320 | US &on, sizeof(on)); | |
8d330698 | 5321 | #endif |
e0574cb5 JH |
5322 | done = 3; |
5323 | message_ended = END_NOTENDED; /* Indicate in middle of data */ | |
059ec3d9 | 5324 | |
e0574cb5 | 5325 | break; |
059ec3d9 PH |
5326 | |
5327 | ||
5328 | case VRFY_CMD: | |
059ec3d9 | 5329 | { |
4f6ae5c3 | 5330 | uschar * address; |
059ec3d9 | 5331 | |
4f6ae5c3 | 5332 | HAD(SCH_VRFY); |
059ec3d9 | 5333 | |
05392bbc JH |
5334 | if (!(address = parse_extract_address(smtp_cmd_data, &errmess, |
5335 | &start, &end, &recipient_domain, FALSE))) | |
5336 | { | |
925ac8e4 | 5337 | smtp_printf("501 %s\r\n", FALSE, errmess); |
05392bbc JH |
5338 | break; |
5339 | } | |
5340 | ||
c39b93a6 | 5341 | if (!recipient_domain) |
2685d6e0 JH |
5342 | if (!(recipient_domain = qualify_recipient(&address, smtp_cmd_data, |
5343 | US"verify"))) | |
05392bbc | 5344 | break; |
4f6ae5c3 | 5345 | |
05392bbc | 5346 | if ((rc = acl_check(ACL_WHERE_VRFY, address, acl_smtp_vrfy, |
4f6ae5c3 JH |
5347 | &user_msg, &log_msg)) != OK) |
5348 | done = smtp_handle_acl_fail(ACL_WHERE_VRFY, rc, user_msg, log_msg); | |
059ec3d9 | 5349 | else |
4f6ae5c3 | 5350 | { |
05392bbc JH |
5351 | uschar * s = NULL; |
5352 | address_item * addr = deliver_make_addr(address, FALSE); | |
059ec3d9 | 5353 | |
4f6ae5c3 JH |
5354 | switch(verify_address(addr, NULL, vopt_is_recipient | vopt_qualify, -1, |
5355 | -1, -1, NULL, NULL, NULL)) | |
5356 | { | |
5357 | case OK: | |
5358 | s = string_sprintf("250 <%s> is deliverable", address); | |
5359 | break; | |
059ec3d9 | 5360 | |
4f6ae5c3 JH |
5361 | case DEFER: |
5362 | s = (addr->user_message != NULL)? | |
5363 | string_sprintf("451 <%s> %s", address, addr->user_message) : | |
5364 | string_sprintf("451 Cannot resolve <%s> at this time", address); | |
5365 | break; | |
059ec3d9 | 5366 | |
4f6ae5c3 JH |
5367 | case FAIL: |
5368 | s = (addr->user_message != NULL)? | |
5369 | string_sprintf("550 <%s> %s", address, addr->user_message) : | |
5370 | string_sprintf("550 <%s> is not deliverable", address); | |
5371 | log_write(0, LOG_MAIN, "VRFY failed for %s %s", | |
5372 | smtp_cmd_argument, host_and_ident(TRUE)); | |
5373 | break; | |
5374 | } | |
5375 | ||
925ac8e4 | 5376 | smtp_printf("%s\r\n", FALSE, s); |
4f6ae5c3 JH |
5377 | } |
5378 | break; | |
059ec3d9 | 5379 | } |
059ec3d9 PH |
5380 | |
5381 | ||
5382 | case EXPN_CMD: | |
e0574cb5 JH |
5383 | HAD(SCH_EXPN); |
5384 | rc = acl_check(ACL_WHERE_EXPN, NULL, acl_smtp_expn, &user_msg, &log_msg); | |
5385 | if (rc != OK) | |
5386 | done = smtp_handle_acl_fail(ACL_WHERE_EXPN, rc, user_msg, log_msg); | |
5387 | else | |
5388 | { | |
8768d548 JH |
5389 | BOOL save_log_testing_mode = f.log_testing_mode; |
5390 | f.address_test_mode = f.log_testing_mode = TRUE; | |
e0574cb5 JH |
5391 | (void) verify_address(deliver_make_addr(smtp_cmd_data, FALSE), |
5392 | smtp_out, vopt_is_recipient | vopt_qualify | vopt_expn, -1, -1, -1, | |
5393 | NULL, NULL, NULL); | |
8768d548 JH |
5394 | f.address_test_mode = FALSE; |
5395 | f.log_testing_mode = save_log_testing_mode; /* true for -bh */ | |
e0574cb5 JH |
5396 | } |
5397 | break; | |
059ec3d9 PH |
5398 | |
5399 | ||
5400 | #ifdef SUPPORT_TLS | |
5401 | ||
5402 | case STARTTLS_CMD: | |
e0574cb5 | 5403 | HAD(SCH_STARTTLS); |
88752192 | 5404 | if (!fl.tls_advertised) |
e0574cb5 JH |
5405 | { |
5406 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
5407 | US"STARTTLS command used when not advertised"); | |
5408 | break; | |
5409 | } | |
059ec3d9 | 5410 | |
e0574cb5 | 5411 | /* Apply an ACL check if one is defined */ |
059ec3d9 | 5412 | |
e0574cb5 JH |
5413 | if ( acl_smtp_starttls |
5414 | && (rc = acl_check(ACL_WHERE_STARTTLS, NULL, acl_smtp_starttls, | |
5415 | &user_msg, &log_msg)) != OK | |
5416 | ) | |
5417 | { | |
5418 | done = smtp_handle_acl_fail(ACL_WHERE_STARTTLS, rc, user_msg, log_msg); | |
5419 | break; | |
5420 | } | |
059ec3d9 | 5421 | |
e0574cb5 JH |
5422 | /* RFC 2487 is not clear on when this command may be sent, though it |
5423 | does state that all information previously obtained from the client | |
5424 | must be discarded if a TLS session is started. It seems reasonable to | |
5425 | do an implied RSET when STARTTLS is received. */ | |
da80c2a8 | 5426 | |
e0574cb5 JH |
5427 | incomplete_transaction_log(US"STARTTLS"); |
5428 | cancel_cutthrough_connection(TRUE, US"STARTTLS received"); | |
5429 | smtp_reset(reset_point); | |
5430 | toomany = FALSE; | |
5431 | cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = FALSE; | |
5432 | ||
5433 | /* There's an attack where more data is read in past the STARTTLS command | |
5434 | before TLS is negotiated, then assumed to be part of the secure session | |
5435 | when used afterwards; we use segregated input buffers, so are not | |
5436 | vulnerable, but we want to note when it happens and, for sheer paranoia, | |
5437 | ensure that the buffer is "wiped". | |
5438 | Pipelining sync checks will normally have protected us too, unless disabled | |
5439 | by configuration. */ | |
5440 | ||
5441 | if (receive_smtp_buffered()) | |
5442 | { | |
5443 | DEBUG(D_any) | |
5444 | debug_printf("Non-empty input buffer after STARTTLS; naive attack?\n"); | |
5445 | if (tls_in.active.sock < 0) | |
5446 | smtp_inend = smtp_inptr = smtp_inbuffer; | |
5447 | /* and if TLS is already active, tls_server_start() should fail */ | |
5448 | } | |
4e7ee012 | 5449 | |
e0574cb5 JH |
5450 | /* There is nothing we value in the input buffer and if TLS is successfully |
5451 | negotiated, we won't use this buffer again; if TLS fails, we'll just read | |
5452 | fresh content into it. The buffer contains arbitrary content from an | |
5453 | untrusted remote source; eg: NOOP <shellcode>\r\nSTARTTLS\r\n | |
5454 | It seems safest to just wipe away the content rather than leave it as a | |
5455 | target to jump to. */ | |
4e7ee012 | 5456 | |
e0574cb5 | 5457 | memset(smtp_inbuffer, 0, IN_BUFFER_SIZE); |
059ec3d9 | 5458 | |
e0574cb5 JH |
5459 | /* Attempt to start up a TLS session, and if successful, discard all |
5460 | knowledge that was obtained previously. At least, that's what the RFC says, | |
5461 | and that's what happens by default. However, in order to work round YAEB, | |
5462 | there is an option to remember the esmtp state. Sigh. | |
059ec3d9 | 5463 | |
e0574cb5 JH |
5464 | We must allow for an extra EHLO command and an extra AUTH command after |
5465 | STARTTLS that don't add to the nonmail command count. */ | |
059ec3d9 | 5466 | |
e0574cb5 JH |
5467 | s = NULL; |
5468 | if ((rc = tls_server_start(tls_require_ciphers, &s)) == OK) | |
5469 | { | |
5470 | if (!tls_remember_esmtp) | |
88752192 | 5471 | fl.helo_seen = fl.esmtp = fl.auth_advertised = f.smtp_in_pipelining_advertised = FALSE; |
e0574cb5 JH |
5472 | cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE; |
5473 | cmd_list[CMD_LIST_AUTH].is_mail_cmd = TRUE; | |
5474 | cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE; | |
5475 | if (sender_helo_name) | |
5476 | { | |
5477 | store_free(sender_helo_name); | |
5478 | sender_helo_name = NULL; | |
5479 | host_build_sender_fullhost(); /* Rebuild */ | |
5480 | set_process_info("handling incoming TLS connection from %s", | |
5481 | host_and_ident(FALSE)); | |
5482 | } | |
5483 | received_protocol = | |
5484 | (sender_host_address ? protocols : protocols_local) | |
88752192 | 5485 | [ (fl.esmtp |
e0574cb5 JH |
5486 | ? pextend + (sender_host_authenticated ? pauthed : 0) |
5487 | : pnormal) | |
5488 | + (tls_in.active.sock >= 0 ? pcrpted : 0) | |
5489 | ]; | |
5490 | ||
5491 | sender_host_auth_pubname = sender_host_authenticated = NULL; | |
5492 | authenticated_id = NULL; | |
5493 | sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING; | |
5494 | DEBUG(D_tls) debug_printf("TLS active\n"); | |
5495 | break; /* Successful STARTTLS */ | |
5496 | } | |
5497 | else | |
5498 | (void) smtp_log_tls_fail(s); | |
059ec3d9 | 5499 | |
e0574cb5 JH |
5500 | /* Some local configuration problem was discovered before actually trying |
5501 | to do a TLS handshake; give a temporary error. */ | |
059ec3d9 | 5502 | |
e0574cb5 JH |
5503 | if (rc == DEFER) |
5504 | { | |
5505 | smtp_printf("454 TLS currently unavailable\r\n", FALSE); | |
5506 | break; | |
5507 | } | |
059ec3d9 | 5508 | |
e0574cb5 JH |
5509 | /* Hard failure. Reject everything except QUIT or closed connection. One |
5510 | cause for failure is a nested STARTTLS, in which case tls_in.active remains | |
ce80533b JH |
5511 | set, but we must still reject all incoming commands. Another is a handshake |
5512 | failure - and there may some encrypted data still in the pipe to us, which we | |
5513 | see as garbage commands. */ | |
059ec3d9 | 5514 | |
e0574cb5 JH |
5515 | DEBUG(D_tls) debug_printf("TLS failed to start\n"); |
5516 | while (done <= 0) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED)) | |
5517 | { | |
5518 | case EOF_CMD: | |
5519 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by EOF", | |
5520 | smtp_get_connection_info()); | |
5521 | smtp_notquit_exit(US"tls-failed", NULL, NULL); | |
5522 | done = 2; | |
5523 | break; | |
8f128379 | 5524 | |
e0574cb5 JH |
5525 | /* It is perhaps arguable as to which exit ACL should be called here, |
5526 | but as it is probably a situation that almost never arises, it | |
5527 | probably doesn't matter. We choose to call the real QUIT ACL, which in | |
5528 | some sense is perhaps "right". */ | |
5529 | ||
5530 | case QUIT_CMD: | |
5531 | user_msg = NULL; | |
5532 | if ( acl_smtp_quit | |
5533 | && ((rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, &user_msg, | |
5534 | &log_msg)) == ERROR)) | |
5535 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s", | |
5536 | log_msg); | |
5537 | if (user_msg) | |
5538 | smtp_respond(US"221", 3, TRUE, user_msg); | |
5539 | else | |
5540 | smtp_printf("221 %s closing connection\r\n", FALSE, smtp_active_hostname); | |
5541 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT", | |
5542 | smtp_get_connection_info()); | |
5543 | done = 2; | |
5544 | break; | |
059ec3d9 | 5545 | |
e0574cb5 JH |
5546 | default: |
5547 | smtp_printf("554 Security failure\r\n", FALSE); | |
5548 | break; | |
5549 | } | |
5550 | tls_close(NULL, TLS_SHUTDOWN_NOWAIT); | |
5551 | break; | |
059ec3d9 PH |
5552 | #endif |
5553 | ||
5554 | ||
5555 | /* The ACL for QUIT is provided for gathering statistical information or | |
5556 | similar; it does not affect the response code, but it can supply a custom | |
5557 | message. */ | |
5558 | ||
5559 | case QUIT_CMD: | |
e0574cb5 JH |
5560 | smtp_quit_handler(&user_msg, &log_msg); |
5561 | done = 2; | |
5562 | break; | |
059ec3d9 PH |
5563 | |
5564 | ||
5565 | case RSET_CMD: | |
e0574cb5 JH |
5566 | smtp_rset_handler(); |
5567 | cancel_cutthrough_connection(TRUE, US"RSET received"); | |
5568 | smtp_reset(reset_point); | |
5569 | toomany = FALSE; | |
5570 | break; | |
059ec3d9 PH |
5571 | |
5572 | ||
5573 | case NOOP_CMD: | |
e0574cb5 JH |
5574 | HAD(SCH_NOOP); |
5575 | smtp_printf("250 OK\r\n", FALSE); | |
5576 | break; | |
059ec3d9 PH |
5577 | |
5578 | ||
b43a74ea PH |
5579 | /* Show ETRN/EXPN/VRFY if there's an ACL for checking hosts; if actually |
5580 | used, a check will be done for permitted hosts. Show STARTTLS only if not | |
5581 | already in a TLS session and if it would be advertised in the EHLO | |
5582 | response. */ | |
059ec3d9 PH |
5583 | |
5584 | case HELP_CMD: | |
e0574cb5 JH |
5585 | HAD(SCH_HELP); |
5586 | smtp_printf("214-Commands supported:\r\n", TRUE); | |
5587 | { | |
5588 | uschar buffer[256]; | |
5589 | buffer[0] = 0; | |
5590 | Ustrcat(buffer, " AUTH"); | |
5591 | #ifdef SUPPORT_TLS | |
5592 | if (tls_in.active.sock < 0 && | |
5593 | verify_check_host(&tls_advertise_hosts) != FAIL) | |
5594 | Ustrcat(buffer, " STARTTLS"); | |
5595 | #endif | |
5596 | Ustrcat(buffer, " HELO EHLO MAIL RCPT DATA BDAT"); | |
5597 | Ustrcat(buffer, " NOOP QUIT RSET HELP"); | |
5598 | if (acl_smtp_etrn != NULL) Ustrcat(buffer, " ETRN"); | |
5599 | if (acl_smtp_expn != NULL) Ustrcat(buffer, " EXPN"); | |
5600 | if (acl_smtp_vrfy != NULL) Ustrcat(buffer, " VRFY"); | |
5601 | smtp_printf("214%s\r\n", FALSE, buffer); | |
5602 | } | |
5603 | break; | |
059ec3d9 PH |
5604 | |
5605 | ||
5606 | case EOF_CMD: | |
e0574cb5 JH |
5607 | incomplete_transaction_log(US"connection lost"); |
5608 | smtp_notquit_exit(US"connection-lost", US"421", | |
5609 | US"%s lost input connection", smtp_active_hostname); | |
5610 | ||
5611 | /* Don't log by default unless in the middle of a message, as some mailers | |
5612 | just drop the call rather than sending QUIT, and it clutters up the logs. | |
5613 | */ | |
5614 | ||
5615 | if (sender_address || recipients_count > 0) | |
5616 | log_write(L_lost_incoming_connection, LOG_MAIN, | |
5617 | "unexpected %s while reading SMTP command from %s%s%s D=%s", | |
8768d548 JH |
5618 | f.sender_host_unknown ? "EOF" : "disconnection", |
5619 | f.tcp_in_fastopen && !f.tcp_in_fastopen_logged ? US"TFO " : US"", | |
e0574cb5 JH |
5620 | host_and_ident(FALSE), smtp_read_error, |
5621 | string_timesince(&smtp_connection_start) | |
5622 | ); | |
2ac25850 | 5623 | |
e0574cb5 JH |
5624 | else |
5625 | log_write(L_smtp_connection, LOG_MAIN, "%s %slost%s D=%s", | |
5626 | smtp_get_connection_info(), | |
8768d548 | 5627 | f.tcp_in_fastopen && !f.tcp_in_fastopen_logged ? US"TFO " : US"", |
e0574cb5 JH |
5628 | smtp_read_error, |
5629 | string_timesince(&smtp_connection_start) | |
5630 | ); | |
5631 | ||
5632 | done = 1; | |
5633 | break; | |
059ec3d9 PH |
5634 | |
5635 | ||
5636 | case ETRN_CMD: | |
e0574cb5 JH |
5637 | HAD(SCH_ETRN); |
5638 | if (sender_address) | |
5639 | { | |
5640 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
5641 | US"ETRN is not permitted inside a transaction"); | |
5642 | break; | |
5643 | } | |
059ec3d9 | 5644 | |
e0574cb5 JH |
5645 | log_write(L_etrn, LOG_MAIN, "ETRN %s received from %s", smtp_cmd_argument, |
5646 | host_and_ident(FALSE)); | |
059ec3d9 | 5647 | |
e0574cb5 JH |
5648 | if ((rc = acl_check(ACL_WHERE_ETRN, NULL, acl_smtp_etrn, |
5649 | &user_msg, &log_msg)) != OK) | |
5650 | { | |
5651 | done = smtp_handle_acl_fail(ACL_WHERE_ETRN, rc, user_msg, log_msg); | |
5652 | break; | |
5653 | } | |
059ec3d9 | 5654 | |
e0574cb5 | 5655 | /* Compute the serialization key for this command. */ |
059ec3d9 | 5656 | |
e0574cb5 | 5657 | etrn_serialize_key = string_sprintf("etrn-%s\n", smtp_cmd_data); |
059ec3d9 | 5658 | |
e0574cb5 JH |
5659 | /* If a command has been specified for running as a result of ETRN, we |
5660 | permit any argument to ETRN. If not, only the # standard form is permitted, | |
5661 | since that is strictly the only kind of ETRN that can be implemented | |
5662 | according to the RFC. */ | |
059ec3d9 | 5663 | |
e0574cb5 JH |
5664 | if (smtp_etrn_command) |
5665 | { | |
5666 | uschar *error; | |
5667 | BOOL rc; | |
5668 | etrn_command = smtp_etrn_command; | |
5669 | deliver_domain = smtp_cmd_data; | |
5670 | rc = transport_set_up_command(&argv, smtp_etrn_command, TRUE, 0, NULL, | |
5671 | US"ETRN processing", &error); | |
5672 | deliver_domain = NULL; | |
5673 | if (!rc) | |
5674 | { | |
5675 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to set up ETRN command: %s", | |
5676 | error); | |
5677 | smtp_printf("458 Internal failure\r\n", FALSE); | |
5678 | break; | |
5679 | } | |
5680 | } | |
059ec3d9 | 5681 | |
e0574cb5 | 5682 | /* Else set up to call Exim with the -R option. */ |
059ec3d9 | 5683 | |
e0574cb5 JH |
5684 | else |
5685 | { | |
5686 | if (*smtp_cmd_data++ != '#') | |
5687 | { | |
5688 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
5689 | US"argument must begin with #"); | |
5690 | break; | |
5691 | } | |
5692 | etrn_command = US"exim -R"; | |
5693 | argv = CUSS child_exec_exim(CEE_RETURN_ARGV, TRUE, NULL, TRUE, | |
5694 | *queue_name ? 4 : 2, | |
5695 | US"-R", smtp_cmd_data, | |
5696 | US"-MCG", queue_name); | |
5697 | } | |
059ec3d9 | 5698 | |
e0574cb5 | 5699 | /* If we are host-testing, don't actually do anything. */ |
059ec3d9 | 5700 | |
e0574cb5 JH |
5701 | if (host_checking) |
5702 | { | |
5703 | HDEBUG(D_any) | |
5704 | { | |
5705 | debug_printf("ETRN command is: %s\n", etrn_command); | |
5706 | debug_printf("ETRN command execution skipped\n"); | |
5707 | } | |
5708 | if (user_msg == NULL) smtp_printf("250 OK\r\n", FALSE); | |
5709 | else smtp_user_msg(US"250", user_msg); | |
5710 | break; | |
5711 | } | |
059ec3d9 PH |
5712 | |
5713 | ||
e0574cb5 JH |
5714 | /* If ETRN queue runs are to be serialized, check the database to |
5715 | ensure one isn't already running. */ | |
059ec3d9 | 5716 | |
e0574cb5 JH |
5717 | if (smtp_etrn_serialize && !enq_start(etrn_serialize_key, 1)) |
5718 | { | |
5719 | smtp_printf("458 Already processing %s\r\n", FALSE, smtp_cmd_data); | |
5720 | break; | |
5721 | } | |
059ec3d9 | 5722 | |
e0574cb5 JH |
5723 | /* Fork a child process and run the command. We don't want to have to |
5724 | wait for the process at any point, so set SIGCHLD to SIG_IGN before | |
5725 | forking. It should be set that way anyway for external incoming SMTP, | |
5726 | but we save and restore to be tidy. If serialization is required, we | |
5727 | actually run the command in yet another process, so we can wait for it | |
5728 | to complete and then remove the serialization lock. */ | |
059ec3d9 | 5729 | |
e0574cb5 | 5730 | oldsignal = signal(SIGCHLD, SIG_IGN); |
059ec3d9 | 5731 | |
e0574cb5 JH |
5732 | if ((pid = fork()) == 0) |
5733 | { | |
5734 | smtp_input = FALSE; /* This process is not associated with the */ | |
5735 | (void)fclose(smtp_in); /* SMTP call any more. */ | |
5736 | (void)fclose(smtp_out); | |
059ec3d9 | 5737 | |
e0574cb5 | 5738 | signal(SIGCHLD, SIG_DFL); /* Want to catch child */ |
059ec3d9 | 5739 | |
e0574cb5 JH |
5740 | /* If not serializing, do the exec right away. Otherwise, fork down |
5741 | into another process. */ | |
059ec3d9 | 5742 | |
e0574cb5 JH |
5743 | if (!smtp_etrn_serialize || (pid = fork()) == 0) |
5744 | { | |
5745 | DEBUG(D_exec) debug_print_argv(argv); | |
5746 | exim_nullstd(); /* Ensure std{in,out,err} exist */ | |
5747 | execv(CS argv[0], (char *const *)argv); | |
5748 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "exec of \"%s\" (ETRN) failed: %s", | |
5749 | etrn_command, strerror(errno)); | |
5750 | _exit(EXIT_FAILURE); /* paranoia */ | |
5751 | } | |
059ec3d9 | 5752 | |
e0574cb5 JH |
5753 | /* Obey this if smtp_serialize and the 2nd fork yielded non-zero. That |
5754 | is, we are in the first subprocess, after forking again. All we can do | |
5755 | for a failing fork is to log it. Otherwise, wait for the 2nd process to | |
5756 | complete, before removing the serialization. */ | |
059ec3d9 | 5757 | |
e0574cb5 JH |
5758 | if (pid < 0) |
5759 | log_write(0, LOG_MAIN|LOG_PANIC, "2nd fork for serialized ETRN " | |
5760 | "failed: %s", strerror(errno)); | |
5761 | else | |
5762 | { | |
5763 | int status; | |
5764 | DEBUG(D_any) debug_printf("waiting for serialized ETRN process %d\n", | |
5765 | (int)pid); | |
5766 | (void)wait(&status); | |
5767 | DEBUG(D_any) debug_printf("serialized ETRN process %d ended\n", | |
5768 | (int)pid); | |
5769 | } | |
059ec3d9 | 5770 | |
e0574cb5 JH |
5771 | enq_end(etrn_serialize_key); |
5772 | _exit(EXIT_SUCCESS); | |
5773 | } | |
059ec3d9 | 5774 | |
e0574cb5 JH |
5775 | /* Back in the top level SMTP process. Check that we started a subprocess |
5776 | and restore the signal state. */ | |
059ec3d9 | 5777 | |
e0574cb5 JH |
5778 | if (pid < 0) |
5779 | { | |
5780 | log_write(0, LOG_MAIN|LOG_PANIC, "fork of process for ETRN failed: %s", | |
5781 | strerror(errno)); | |
5782 | smtp_printf("458 Unable to fork process\r\n", FALSE); | |
5783 | if (smtp_etrn_serialize) enq_end(etrn_serialize_key); | |
5784 | } | |
5785 | else | |
5786 | { | |
5787 | if (user_msg == NULL) smtp_printf("250 OK\r\n", FALSE); | |
5788 | else smtp_user_msg(US"250", user_msg); | |
5789 | } | |
059ec3d9 | 5790 | |
e0574cb5 JH |
5791 | signal(SIGCHLD, oldsignal); |
5792 | break; | |
059ec3d9 PH |
5793 | |
5794 | ||
5795 | case BADARG_CMD: | |
e0574cb5 JH |
5796 | done = synprot_error(L_smtp_syntax_error, 501, NULL, |
5797 | US"unexpected argument data"); | |
5798 | break; | |
059ec3d9 PH |
5799 | |
5800 | ||
5801 | /* This currently happens only for NULLs, but could be extended. */ | |
5802 | ||
5803 | case BADCHAR_CMD: | |
e0574cb5 JH |
5804 | done = synprot_error(L_smtp_syntax_error, 0, NULL, /* Just logs */ |
5805 | US"NUL character(s) present (shown as '?')"); | |
5806 | smtp_printf("501 NUL characters are not allowed in SMTP commands\r\n", | |
5807 | FALSE); | |
5808 | break; | |
059ec3d9 PH |
5809 | |
5810 | ||
5811 | case BADSYN_CMD: | |
a14e5636 | 5812 | SYNC_FAILURE: |
e0574cb5 JH |
5813 | if (smtp_inend >= smtp_inbuffer + IN_BUFFER_SIZE) |
5814 | smtp_inend = smtp_inbuffer + IN_BUFFER_SIZE - 1; | |
5815 | c = smtp_inend - smtp_inptr; | |
5816 | if (c > 150) c = 150; /* limit logged amount */ | |
5817 | smtp_inptr[c] = 0; | |
5818 | incomplete_transaction_log(US"sync failure"); | |
5819 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol synchronization error " | |
5820 | "(next input sent too soon: pipelining was%s advertised): " | |
5821 | "rejected \"%s\" %s next input=\"%s\"", | |
8768d548 | 5822 | f.smtp_in_pipelining_advertised ? "" : " not", |
e0574cb5 JH |
5823 | smtp_cmd_buffer, host_and_ident(TRUE), |
5824 | string_printing(smtp_inptr)); | |
5825 | smtp_notquit_exit(US"synchronization-error", US"554", | |
5826 | US"SMTP synchronization error"); | |
5827 | done = 1; /* Pretend eof - drops connection */ | |
5828 | break; | |
059ec3d9 PH |
5829 | |
5830 | ||
5831 | case TOO_MANY_NONMAIL_CMD: | |
e0574cb5 JH |
5832 | s = smtp_cmd_buffer; |
5833 | while (*s != 0 && !isspace(*s)) s++; | |
5834 | incomplete_transaction_log(US"too many non-mail commands"); | |
5835 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
5836 | "nonmail commands (last was \"%.*s\")", host_and_ident(FALSE), | |
5837 | (int)(s - smtp_cmd_buffer), smtp_cmd_buffer); | |
5838 | smtp_notquit_exit(US"bad-commands", US"554", US"Too many nonmail commands"); | |
5839 | done = 1; /* Pretend eof - drops connection */ | |
5840 | break; | |
059ec3d9 | 5841 | |
cee5f132 | 5842 | #ifdef SUPPORT_PROXY |
a3c86431 | 5843 | case PROXY_FAIL_IGNORE_CMD: |
e0574cb5 JH |
5844 | smtp_printf("503 Command refused, required Proxy negotiation failed\r\n", FALSE); |
5845 | break; | |
cee5f132 | 5846 | #endif |
059ec3d9 PH |
5847 | |
5848 | default: | |
e0574cb5 JH |
5849 | if (unknown_command_count++ >= smtp_max_unknown_commands) |
5850 | { | |
5851 | log_write(L_smtp_syntax_error, LOG_MAIN, | |
5852 | "SMTP syntax error in \"%s\" %s %s", | |
5853 | string_printing(smtp_cmd_buffer), host_and_ident(TRUE), | |
5854 | US"unrecognized command"); | |
5855 | incomplete_transaction_log(US"unrecognized command"); | |
5856 | smtp_notquit_exit(US"bad-commands", US"500", | |
5857 | US"Too many unrecognized commands"); | |
5858 | done = 2; | |
5859 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
5860 | "unrecognized commands (last was \"%s\")", host_and_ident(FALSE), | |
5861 | string_printing(smtp_cmd_buffer)); | |
5862 | } | |
5863 | else | |
5864 | done = synprot_error(L_smtp_syntax_error, 500, NULL, | |
5865 | US"unrecognized command"); | |
5866 | break; | |
059ec3d9 PH |
5867 | } |
5868 | ||
5869 | /* This label is used by goto's inside loops that want to break out to | |
5870 | the end of the command-processing loop. */ | |
5871 | ||
5872 | COMMAND_LOOP: | |
5873 | last_was_rej_mail = was_rej_mail; /* Remember some last commands for */ | |
5874 | last_was_rcpt = was_rcpt; /* protocol error handling */ | |
5875 | continue; | |
5876 | } | |
5877 | ||
5878 | return done - 2; /* Convert yield values */ | |
5879 | } | |
5880 | ||
dfbcb5ac JH |
5881 | |
5882 | ||
5883 | gstring * | |
5884 | authres_smtpauth(gstring * g) | |
5885 | { | |
5886 | if (!sender_host_authenticated) | |
5887 | return g; | |
5888 | ||
c44ff8be JH |
5889 | g = string_append(g, 2, US";\n\tauth=pass (", sender_host_auth_pubname); |
5890 | ||
5891 | if (Ustrcmp(sender_host_auth_pubname, "tls") != 0) | |
5892 | g = string_append(g, 2, US") smtp.auth=", authenticated_id); | |
5893 | else if (authenticated_id) | |
5894 | g = string_append(g, 2, US") x509.auth=", authenticated_id); | |
5895 | else | |
5896 | g = string_catn(g, US") reason=x509.auth", 17); | |
5897 | ||
dfbcb5ac JH |
5898 | if (authenticated_sender) |
5899 | g = string_append(g, 2, US" smtp.mailfrom=", authenticated_sender); | |
5900 | return g; | |
5901 | } | |
5902 | ||
5903 | ||
5904 | ||
e45a1c37 JH |
5905 | /* vi: aw ai sw=2 |
5906 | */ | |
059ec3d9 | 5907 | /* End of smtp_in.c */ |