Commit | Line | Data |
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059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
d4e5e70b | 5 | /* Copyright (c) University of Cambridge 1995 - 2017 */ |
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 | ||
134 | static auth_instance *authenticated_by; | |
135 | static BOOL auth_advertised; | |
136 | #ifdef SUPPORT_TLS | |
137 | static BOOL tls_advertised; | |
138 | #endif | |
6c1c3d1d | 139 | static BOOL dsn_advertised; |
059ec3d9 PH |
140 | static BOOL esmtp; |
141 | static BOOL helo_required = FALSE; | |
142 | static BOOL helo_verify = FALSE; | |
143 | static BOOL helo_seen; | |
144 | static BOOL helo_accept_junk; | |
145 | static BOOL count_nonmail; | |
146 | static BOOL pipelining_advertised; | |
2679d413 PH |
147 | static BOOL rcpt_smtp_response_same; |
148 | static BOOL rcpt_in_progress; | |
059ec3d9 | 149 | static int nonmail_command_count; |
8f128379 | 150 | static BOOL smtp_exit_function_called = 0; |
8c5d388a | 151 | #ifdef SUPPORT_I18N |
d1a13eea JH |
152 | static BOOL smtputf8_advertised; |
153 | #endif | |
059ec3d9 PH |
154 | static int synprot_error_count; |
155 | static int unknown_command_count; | |
156 | static int sync_cmd_limit; | |
157 | static int smtp_write_error = 0; | |
158 | ||
2679d413 | 159 | static uschar *rcpt_smtp_response; |
ca86f471 PH |
160 | static uschar *smtp_data_buffer; |
161 | static uschar *smtp_cmd_data; | |
162 | ||
059ec3d9 PH |
163 | /* We need to know the position of RSET, HELO, EHLO, AUTH, and STARTTLS. Their |
164 | final fields of all except AUTH are forced TRUE at the start of a new message | |
165 | setup, to allow one of each between messages that is not counted as a nonmail | |
166 | command. (In fact, only one of HELO/EHLO is not counted.) Also, we have to | |
167 | allow a new EHLO after starting up TLS. | |
168 | ||
169 | AUTH is "falsely" labelled as a mail command initially, so that it doesn't get | |
170 | counted. However, the flag is changed when AUTH is received, so that multiple | |
171 | failing AUTHs will eventually hit the limit. After a successful AUTH, another | |
172 | AUTH is already forbidden. After a TLS session is started, AUTH's flag is again | |
173 | forced TRUE, to allow for the re-authentication that can happen at that point. | |
174 | ||
175 | QUIT is also "falsely" labelled as a mail command so that it doesn't up the | |
2f460950 JH |
176 | count of non-mail commands and possibly provoke an error. |
177 | ||
178 | tls_auth is a pseudo-command, never expected in input. It is activated | |
179 | on TLS startup and looks for a tls authenticator. */ | |
059ec3d9 PH |
180 | |
181 | static smtp_cmd_list cmd_list[] = { | |
d1a13eea JH |
182 | /* name len cmd has_arg is_mail_cmd */ |
183 | ||
059ec3d9 PH |
184 | { "rset", sizeof("rset")-1, RSET_CMD, FALSE, FALSE }, /* First */ |
185 | { "helo", sizeof("helo")-1, HELO_CMD, TRUE, FALSE }, | |
186 | { "ehlo", sizeof("ehlo")-1, EHLO_CMD, TRUE, FALSE }, | |
187 | { "auth", sizeof("auth")-1, AUTH_CMD, TRUE, TRUE }, | |
188 | #ifdef SUPPORT_TLS | |
189 | { "starttls", sizeof("starttls")-1, STARTTLS_CMD, FALSE, FALSE }, | |
b3ef41c9 | 190 | { "tls_auth", 0, TLS_AUTH_CMD, FALSE, TRUE }, |
059ec3d9 PH |
191 | #endif |
192 | ||
193 | /* If you change anything above here, also fix the definitions below. */ | |
194 | ||
195 | { "mail from:", sizeof("mail from:")-1, MAIL_CMD, TRUE, TRUE }, | |
196 | { "rcpt to:", sizeof("rcpt to:")-1, RCPT_CMD, TRUE, TRUE }, | |
197 | { "data", sizeof("data")-1, DATA_CMD, FALSE, TRUE }, | |
18481de3 | 198 | { "bdat", sizeof("bdat")-1, BDAT_CMD, TRUE, TRUE }, |
059ec3d9 PH |
199 | { "quit", sizeof("quit")-1, QUIT_CMD, FALSE, TRUE }, |
200 | { "noop", sizeof("noop")-1, NOOP_CMD, TRUE, FALSE }, | |
201 | { "etrn", sizeof("etrn")-1, ETRN_CMD, TRUE, FALSE }, | |
202 | { "vrfy", sizeof("vrfy")-1, VRFY_CMD, TRUE, FALSE }, | |
203 | { "expn", sizeof("expn")-1, EXPN_CMD, TRUE, FALSE }, | |
204 | { "help", sizeof("help")-1, HELP_CMD, TRUE, FALSE } | |
205 | }; | |
206 | ||
207 | static smtp_cmd_list *cmd_list_end = | |
208 | cmd_list + sizeof(cmd_list)/sizeof(smtp_cmd_list); | |
209 | ||
210 | #define CMD_LIST_RSET 0 | |
211 | #define CMD_LIST_HELO 1 | |
212 | #define CMD_LIST_EHLO 2 | |
213 | #define CMD_LIST_AUTH 3 | |
214 | #define CMD_LIST_STARTTLS 4 | |
b3ef41c9 | 215 | #define CMD_LIST_TLS_AUTH 5 |
059ec3d9 | 216 | |
b4ed4da0 PH |
217 | /* This list of names is used for performing the smtp_no_mail logging action. |
218 | It must be kept in step with the SCH_xxx enumerations. */ | |
219 | ||
220 | static uschar *smtp_names[] = | |
221 | { | |
18481de3 JH |
222 | US"NONE", US"AUTH", US"DATA", US"BDAT", US"EHLO", US"ETRN", US"EXPN", |
223 | US"HELO", US"HELP", US"MAIL", US"NOOP", US"QUIT", US"RCPT", US"RSET", | |
224 | US"STARTTLS", US"VRFY" }; | |
b4ed4da0 | 225 | |
e524074d | 226 | static uschar *protocols_local[] = { |
981756db PH |
227 | US"local-smtp", /* HELO */ |
228 | US"local-smtps", /* The rare case EHLO->STARTTLS->HELO */ | |
229 | US"local-esmtp", /* EHLO */ | |
230 | US"local-esmtps", /* EHLO->STARTTLS->EHLO */ | |
231 | US"local-esmtpa", /* EHLO->AUTH */ | |
232 | US"local-esmtpsa" /* EHLO->STARTTLS->EHLO->AUTH */ | |
059ec3d9 | 233 | }; |
e524074d JH |
234 | static uschar *protocols[] = { |
235 | US"smtp", /* HELO */ | |
236 | US"smtps", /* The rare case EHLO->STARTTLS->HELO */ | |
237 | US"esmtp", /* EHLO */ | |
238 | US"esmtps", /* EHLO->STARTTLS->EHLO */ | |
239 | US"esmtpa", /* EHLO->AUTH */ | |
240 | US"esmtpsa" /* EHLO->STARTTLS->EHLO->AUTH */ | |
241 | }; | |
059ec3d9 PH |
242 | |
243 | #define pnormal 0 | |
981756db PH |
244 | #define pextend 2 |
245 | #define pcrpted 1 /* added to pextend or pnormal */ | |
246 | #define pauthed 2 /* added to pextend */ | |
059ec3d9 | 247 | |
d27f98fe TL |
248 | /* Sanity check and validate optional args to MAIL FROM: envelope */ |
249 | enum { | |
2ef7ed08 | 250 | ENV_MAIL_OPT_NULL, |
d27f98fe | 251 | ENV_MAIL_OPT_SIZE, ENV_MAIL_OPT_BODY, ENV_MAIL_OPT_AUTH, |
8ccd00b1 | 252 | #ifndef DISABLE_PRDR |
fd98a5c6 | 253 | ENV_MAIL_OPT_PRDR, |
6c1c3d1d | 254 | #endif |
6c1c3d1d | 255 | ENV_MAIL_OPT_RET, ENV_MAIL_OPT_ENVID, |
8c5d388a | 256 | #ifdef SUPPORT_I18N |
d1a13eea JH |
257 | ENV_MAIL_OPT_UTF8, |
258 | #endif | |
d27f98fe TL |
259 | }; |
260 | typedef struct { | |
261 | uschar * name; /* option requested during MAIL cmd */ | |
262 | int value; /* enum type */ | |
263 | BOOL need_value; /* TRUE requires value (name=value pair format) | |
264 | FALSE is a singleton */ | |
265 | } env_mail_type_t; | |
266 | static env_mail_type_t env_mail_type_list[] = { | |
267 | { US"SIZE", ENV_MAIL_OPT_SIZE, TRUE }, | |
268 | { US"BODY", ENV_MAIL_OPT_BODY, TRUE }, | |
269 | { US"AUTH", ENV_MAIL_OPT_AUTH, TRUE }, | |
8ccd00b1 | 270 | #ifndef DISABLE_PRDR |
fd98a5c6 | 271 | { US"PRDR", ENV_MAIL_OPT_PRDR, FALSE }, |
6c1c3d1d | 272 | #endif |
6c1c3d1d WB |
273 | { US"RET", ENV_MAIL_OPT_RET, TRUE }, |
274 | { US"ENVID", ENV_MAIL_OPT_ENVID, TRUE }, | |
8c5d388a | 275 | #ifdef SUPPORT_I18N |
d1a13eea JH |
276 | { US"SMTPUTF8",ENV_MAIL_OPT_UTF8, FALSE }, /* rfc6531 */ |
277 | #endif | |
2ef7ed08 HSHR |
278 | /* keep this the last entry */ |
279 | { US"NULL", ENV_MAIL_OPT_NULL, FALSE }, | |
d27f98fe TL |
280 | }; |
281 | ||
059ec3d9 PH |
282 | /* When reading SMTP from a remote host, we have to use our own versions of the |
283 | C input-reading functions, in order to be able to flush the SMTP output only | |
284 | when about to read more data from the socket. This is the only way to get | |
285 | optimal performance when the client is using pipelining. Flushing for every | |
286 | command causes a separate packet and reply packet each time; saving all the | |
287 | responses up (when pipelining) combines them into one packet and one response. | |
288 | ||
289 | For simplicity, these functions are used for *all* SMTP input, not only when | |
290 | receiving over a socket. However, after setting up a secure socket (SSL), input | |
291 | is read via the OpenSSL library, and another set of functions is used instead | |
292 | (see tls.c). | |
293 | ||
294 | These functions are set in the receive_getc etc. variables and called with the | |
295 | same interface as the C functions. However, since there can only ever be | |
296 | one incoming SMTP call, we just use a single buffer and flags. There is no need | |
297 | to implement a complicated private FILE-like structure.*/ | |
298 | ||
299 | static uschar *smtp_inbuffer; | |
300 | static uschar *smtp_inptr; | |
301 | static uschar *smtp_inend; | |
302 | static int smtp_had_eof; | |
303 | static int smtp_had_error; | |
304 | ||
305 | ||
7e3ce68e | 306 | /* forward declarations */ |
bd8fbe36 | 307 | static int smtp_read_command(BOOL check_sync, unsigned buffer_lim); |
7e3ce68e JH |
308 | static int synprot_error(int type, int code, uschar *data, uschar *errmess); |
309 | static void smtp_quit_handler(uschar **, uschar **); | |
310 | static void smtp_rset_handler(void); | |
311 | ||
f4630439 JH |
312 | /************************************************* |
313 | * Recheck synchronization * | |
314 | *************************************************/ | |
315 | ||
316 | /* Synchronization checks can never be perfect because a packet may be on its | |
317 | way but not arrived when the check is done. Such checks can in any case only be | |
318 | done when TLS is not in use. Normally, the checks happen when commands are | |
319 | read: Exim ensures that there is no more input in the input buffer. In normal | |
320 | cases, the response to the command will be fast, and there is no further check. | |
321 | ||
322 | However, for some commands an ACL is run, and that can include delays. In those | |
323 | cases, it is useful to do another check on the input just before sending the | |
324 | response. This also applies at the start of a connection. This function does | |
325 | that check by means of the select() function, as long as the facility is not | |
326 | disabled or inappropriate. A failure of select() is ignored. | |
327 | ||
328 | When there is unwanted input, we read it so that it appears in the log of the | |
329 | error. | |
330 | ||
331 | Arguments: none | |
332 | Returns: TRUE if all is well; FALSE if there is input pending | |
333 | */ | |
334 | ||
335 | static BOOL | |
336 | check_sync(void) | |
337 | { | |
338 | int fd, rc; | |
339 | fd_set fds; | |
340 | struct timeval tzero; | |
341 | ||
342 | if (!smtp_enforce_sync || sender_host_address == NULL || | |
343 | sender_host_notsocket || tls_in.active >= 0) | |
344 | return TRUE; | |
345 | ||
346 | fd = fileno(smtp_in); | |
347 | FD_ZERO(&fds); | |
348 | FD_SET(fd, &fds); | |
349 | tzero.tv_sec = 0; | |
350 | tzero.tv_usec = 0; | |
351 | rc = select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tzero); | |
352 | ||
353 | if (rc <= 0) return TRUE; /* Not ready to read */ | |
bd8fbe36 | 354 | rc = smtp_getc(GETC_BUFFER_UNLIMITED); |
f4630439 JH |
355 | if (rc < 0) return TRUE; /* End of file or error */ |
356 | ||
357 | smtp_ungetc(rc); | |
358 | rc = smtp_inend - smtp_inptr; | |
359 | if (rc > 150) rc = 150; | |
360 | smtp_inptr[rc] = 0; | |
361 | return FALSE; | |
362 | } | |
363 | ||
364 | ||
365 | ||
366 | /************************************************* | |
367 | * Log incomplete transactions * | |
368 | *************************************************/ | |
369 | ||
370 | /* This function is called after a transaction has been aborted by RSET, QUIT, | |
371 | connection drops or other errors. It logs the envelope information received | |
372 | so far in order to preserve address verification attempts. | |
373 | ||
374 | Argument: string to indicate what aborted the transaction | |
375 | Returns: nothing | |
376 | */ | |
377 | ||
378 | static void | |
379 | incomplete_transaction_log(uschar *what) | |
380 | { | |
381 | if (sender_address == NULL || /* No transaction in progress */ | |
382 | !LOGGING(smtp_incomplete_transaction)) | |
383 | return; | |
384 | ||
385 | /* Build list of recipients for logging */ | |
386 | ||
387 | if (recipients_count > 0) | |
388 | { | |
389 | int i; | |
390 | raw_recipients = store_get(recipients_count * sizeof(uschar *)); | |
391 | for (i = 0; i < recipients_count; i++) | |
392 | raw_recipients[i] = recipients_list[i].address; | |
393 | raw_recipients_count = recipients_count; | |
394 | } | |
395 | ||
396 | log_write(L_smtp_incomplete_transaction, LOG_MAIN|LOG_SENDER|LOG_RECIPIENTS, | |
397 | "%s incomplete transaction (%s)", host_and_ident(TRUE), what); | |
398 | } | |
399 | ||
400 | ||
401 | ||
402 | ||
0d81dabc JH |
403 | /* Refill the buffer, and notify DKIM verification code. |
404 | Return false for error or EOF. | |
405 | */ | |
406 | ||
407 | static BOOL | |
408 | smtp_refill(unsigned lim) | |
409 | { | |
410 | int rc, save_errno; | |
411 | if (!smtp_out) return FALSE; | |
412 | fflush(smtp_out); | |
413 | if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout); | |
414 | ||
415 | /* Limit amount read, so non-message data is not fed to DKIM */ | |
416 | ||
417 | rc = read(fileno(smtp_in), smtp_inbuffer, MIN(IN_BUFFER_SIZE, lim)); | |
418 | save_errno = errno; | |
419 | alarm(0); | |
420 | if (rc <= 0) | |
421 | { | |
422 | /* Must put the error text in fixed store, because this might be during | |
423 | header reading, where it releases unused store above the header. */ | |
424 | if (rc < 0) | |
425 | { | |
426 | smtp_had_error = save_errno; | |
427 | smtp_read_error = string_copy_malloc( | |
428 | string_sprintf(" (error: %s)", strerror(save_errno))); | |
429 | } | |
430 | else smtp_had_eof = 1; | |
431 | return FALSE; | |
432 | } | |
433 | #ifndef DISABLE_DKIM | |
434 | dkim_exim_verify_feed(smtp_inbuffer, rc); | |
435 | #endif | |
436 | smtp_inend = smtp_inbuffer + rc; | |
437 | smtp_inptr = smtp_inbuffer; | |
438 | return TRUE; | |
439 | } | |
440 | ||
059ec3d9 PH |
441 | /************************************************* |
442 | * SMTP version of getc() * | |
443 | *************************************************/ | |
444 | ||
445 | /* This gets the next byte from the SMTP input buffer. If the buffer is empty, | |
446 | it flushes the output, and refills the buffer, with a timeout. The signal | |
447 | handler is set appropriately by the calling function. This function is not used | |
4c04137d | 448 | after a connection has negotiated itself into an TLS/SSL state. |
059ec3d9 | 449 | |
bd8fbe36 | 450 | Arguments: lim Maximum amount to read/buffer |
059ec3d9 PH |
451 | Returns: the next character or EOF |
452 | */ | |
453 | ||
454 | int | |
bd8fbe36 | 455 | smtp_getc(unsigned lim) |
059ec3d9 PH |
456 | { |
457 | if (smtp_inptr >= smtp_inend) | |
0d81dabc | 458 | if (!smtp_refill(lim)) |
059ec3d9 | 459 | return EOF; |
059ec3d9 PH |
460 | return *smtp_inptr++; |
461 | } | |
462 | ||
0d81dabc JH |
463 | uschar * |
464 | smtp_getbuf(unsigned * len) | |
465 | { | |
466 | unsigned size; | |
467 | uschar * buf; | |
468 | ||
469 | if (smtp_inptr >= smtp_inend) | |
470 | if (!smtp_refill(*len)) | |
471 | { *len = 0; return NULL; } | |
472 | ||
473 | if ((size = smtp_inend - smtp_inptr) > *len) size = *len; | |
474 | buf = smtp_inptr; | |
475 | smtp_inptr += size; | |
476 | *len = size; | |
477 | return buf; | |
478 | } | |
479 | ||
584e96c6 JH |
480 | void |
481 | smtp_get_cache(void) | |
482 | { | |
9960d1e5 | 483 | #ifndef DISABLE_DKIM |
584e96c6 JH |
484 | int n = smtp_inend - smtp_inptr; |
485 | if (n > 0) | |
486 | dkim_exim_verify_feed(smtp_inptr, n); | |
584e96c6 | 487 | #endif |
9960d1e5 | 488 | } |
059ec3d9 PH |
489 | |
490 | ||
7e3ce68e JH |
491 | /* Get a byte from the smtp input, in CHUNKING mode. Handle ack of the |
492 | previous BDAT chunk and getting new ones when we run out. Uses the | |
493 | underlying smtp_getc or tls_getc both for that and for getting the | |
494 | (buffered) data byte. EOD signals (an expected) no further data. | |
495 | ERR signals a protocol error, and EOF a closed input stream. | |
496 | ||
497 | Called from read_bdat_smtp() in receive.c for the message body, but also | |
498 | by the headers read loop in receive_msg(); manipulates chunking_state | |
499 | to handle the BDAT command/response. | |
500 | Placed here due to the correlation with the above smtp_getc(), which it wraps, | |
501 | and also by the need to do smtp command/response handling. | |
502 | ||
bd8fbe36 | 503 | Arguments: lim (ignored) |
7e3ce68e JH |
504 | Returns: the next character or ERR, EOD or EOF |
505 | */ | |
506 | ||
507 | int | |
bd8fbe36 | 508 | bdat_getc(unsigned lim) |
7e3ce68e JH |
509 | { |
510 | uschar * user_msg = NULL; | |
511 | uschar * log_msg; | |
512 | ||
513 | for(;;) | |
514 | { | |
79de4f37 JH |
515 | #ifndef DISABLE_DKIM |
516 | BOOL dkim_save; | |
517 | #endif | |
518 | ||
bd8fbe36 JH |
519 | if (chunking_data_left > 0) |
520 | return lwr_receive_getc(chunking_data_left--); | |
7e3ce68e JH |
521 | |
522 | receive_getc = lwr_receive_getc; | |
0d81dabc | 523 | receive_getbuf = lwr_receive_getbuf; |
7e3ce68e | 524 | receive_ungetc = lwr_receive_ungetc; |
bd8fbe36 | 525 | #ifndef DISABLE_DKIM |
79de4f37 | 526 | dkim_save = dkim_collect_input; |
bd8fbe36 JH |
527 | dkim_collect_input = FALSE; |
528 | #endif | |
7e3ce68e | 529 | |
f4630439 JH |
530 | /* Unless PIPELINING was offered, there should be no next command |
531 | until after we ack that chunk */ | |
532 | ||
533 | if (!pipelining_advertised && !check_sync()) | |
534 | { | |
535 | incomplete_transaction_log(US"sync failure"); | |
536 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol synchronization error " | |
537 | "(next input sent too soon: pipelining was not advertised): " | |
538 | "rejected \"%s\" %s next input=\"%s\"", | |
539 | smtp_cmd_buffer, host_and_ident(TRUE), | |
540 | string_printing(smtp_inptr)); | |
541 | (void) synprot_error(L_smtp_protocol_error, 554, NULL, | |
542 | US"SMTP synchronization error"); | |
543 | goto repeat_until_rset; | |
544 | } | |
545 | ||
7e3ce68e JH |
546 | /* If not the last, ack the received chunk. The last response is delayed |
547 | until after the data ACL decides on it */ | |
7e3ce68e JH |
548 | |
549 | if (chunking_state == CHUNKING_LAST) | |
584e96c6 JH |
550 | { |
551 | #ifndef DISABLE_DKIM | |
e983e85a | 552 | dkim_exim_verify_feed(NULL, 0); /* notify EOD */ |
584e96c6 | 553 | #endif |
7e3ce68e | 554 | return EOD; |
584e96c6 | 555 | } |
7e3ce68e | 556 | |
7e3ce68e | 557 | smtp_printf("250 %u byte chunk received\r\n", chunking_datasize); |
bd8fbe36 JH |
558 | chunking_state = CHUNKING_OFFERED; |
559 | DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state); | |
7e3ce68e JH |
560 | |
561 | /* Expect another BDAT cmd from input. RFC 3030 says nothing about | |
562 | QUIT, RSET or NOOP but handling them seems obvious */ | |
563 | ||
564 | next_cmd: | |
bd8fbe36 | 565 | switch(smtp_read_command(TRUE, 1)) |
7e3ce68e JH |
566 | { |
567 | default: | |
568 | (void) synprot_error(L_smtp_protocol_error, 503, NULL, | |
569 | US"only BDAT permissible after non-LAST BDAT"); | |
570 | ||
571 | repeat_until_rset: | |
bd8fbe36 | 572 | switch(smtp_read_command(TRUE, 1)) |
7e3ce68e JH |
573 | { |
574 | case QUIT_CMD: smtp_quit_handler(&user_msg, &log_msg); /*FALLTHROUGH */ | |
575 | case EOF_CMD: return EOF; | |
576 | case RSET_CMD: smtp_rset_handler(); return ERR; | |
577 | default: if (synprot_error(L_smtp_protocol_error, 503, NULL, | |
578 | US"only RSET accepted now") > 0) | |
579 | return EOF; | |
580 | goto repeat_until_rset; | |
581 | } | |
582 | ||
583 | case QUIT_CMD: | |
584 | smtp_quit_handler(&user_msg, &log_msg); | |
585 | /*FALLTHROUGH*/ | |
586 | case EOF_CMD: | |
587 | return EOF; | |
588 | ||
589 | case RSET_CMD: | |
590 | smtp_rset_handler(); | |
591 | return ERR; | |
592 | ||
593 | case NOOP_CMD: | |
594 | HAD(SCH_NOOP); | |
595 | smtp_printf("250 OK\r\n"); | |
596 | goto next_cmd; | |
597 | ||
598 | case BDAT_CMD: | |
599 | { | |
600 | int n; | |
601 | ||
602 | if (sscanf(CS smtp_cmd_data, "%u %n", &chunking_datasize, &n) < 1) | |
603 | { | |
604 | (void) synprot_error(L_smtp_protocol_error, 501, NULL, | |
605 | US"missing size for BDAT command"); | |
606 | return ERR; | |
607 | } | |
608 | chunking_state = strcmpic(smtp_cmd_data+n, US"LAST") == 0 | |
609 | ? CHUNKING_LAST : CHUNKING_ACTIVE; | |
610 | chunking_data_left = chunking_datasize; | |
bd8fbe36 JH |
611 | DEBUG(D_receive) debug_printf("chunking state %d, %d bytes\n", |
612 | (int)chunking_state, chunking_data_left); | |
7e3ce68e JH |
613 | |
614 | if (chunking_datasize == 0) | |
615 | if (chunking_state == CHUNKING_LAST) | |
616 | return EOD; | |
617 | else | |
618 | { | |
619 | (void) synprot_error(L_smtp_protocol_error, 504, NULL, | |
620 | US"zero size for BDAT command"); | |
621 | goto repeat_until_rset; | |
622 | } | |
623 | ||
624 | receive_getc = bdat_getc; | |
0d81dabc | 625 | receive_getbuf = bdat_getbuf; |
7e3ce68e | 626 | receive_ungetc = bdat_ungetc; |
bd8fbe36 | 627 | #ifndef DISABLE_DKIM |
79de4f37 | 628 | dkim_collect_input = dkim_save; |
bd8fbe36 | 629 | #endif |
7e3ce68e JH |
630 | break; /* to top of main loop */ |
631 | } | |
632 | } | |
633 | } | |
634 | } | |
635 | ||
0d81dabc JH |
636 | uschar * |
637 | bdat_getbuf(unsigned * len) | |
638 | { | |
639 | uschar * buf; | |
640 | ||
641 | if (chunking_data_left <= 0) | |
642 | { *len = 0; return NULL; } | |
643 | ||
644 | if (*len > chunking_data_left) *len = chunking_data_left; | |
645 | buf = lwr_receive_getbuf(len); /* Either smtp_getbuf or tls_getbuf */ | |
646 | chunking_data_left -= *len; | |
647 | return buf; | |
648 | } | |
649 | ||
1ebe15c3 | 650 | void |
45bd315d JH |
651 | bdat_flush_data(void) |
652 | { | |
0d81dabc JH |
653 | unsigned n = chunking_data_left; |
654 | (void) bdat_getbuf(&n); | |
45bd315d JH |
655 | |
656 | receive_getc = lwr_receive_getc; | |
0d81dabc | 657 | receive_getbuf = lwr_receive_getbuf; |
45bd315d JH |
658 | receive_ungetc = lwr_receive_ungetc; |
659 | ||
660 | if (chunking_state != CHUNKING_LAST) | |
bd8fbe36 | 661 | { |
45bd315d | 662 | chunking_state = CHUNKING_OFFERED; |
bd8fbe36 JH |
663 | DEBUG(D_receive) debug_printf("chunking state %d\n", (int)chunking_state); |
664 | } | |
45bd315d JH |
665 | } |
666 | ||
7e3ce68e JH |
667 | |
668 | ||
669 | ||
059ec3d9 PH |
670 | /************************************************* |
671 | * SMTP version of ungetc() * | |
672 | *************************************************/ | |
673 | ||
674 | /* Puts a character back in the input buffer. Only ever | |
675 | called once. | |
676 | ||
677 | Arguments: | |
678 | ch the character | |
679 | ||
680 | Returns: the character | |
681 | */ | |
682 | ||
683 | int | |
684 | smtp_ungetc(int ch) | |
685 | { | |
7e3ce68e | 686 | *--smtp_inptr = ch; |
059ec3d9 PH |
687 | return ch; |
688 | } | |
689 | ||
690 | ||
7e3ce68e JH |
691 | int |
692 | bdat_ungetc(int ch) | |
693 | { | |
694 | chunking_data_left++; | |
695 | return lwr_receive_ungetc(ch); | |
696 | } | |
697 | ||
059ec3d9 PH |
698 | |
699 | ||
700 | /************************************************* | |
701 | * SMTP version of feof() * | |
702 | *************************************************/ | |
703 | ||
704 | /* Tests for a previous EOF | |
705 | ||
706 | Arguments: none | |
707 | Returns: non-zero if the eof flag is set | |
708 | */ | |
709 | ||
710 | int | |
711 | smtp_feof(void) | |
712 | { | |
713 | return smtp_had_eof; | |
714 | } | |
715 | ||
716 | ||
717 | ||
718 | ||
719 | /************************************************* | |
720 | * SMTP version of ferror() * | |
721 | *************************************************/ | |
722 | ||
723 | /* Tests for a previous read error, and returns with errno | |
724 | restored to what it was when the error was detected. | |
725 | ||
726 | Arguments: none | |
727 | Returns: non-zero if the error flag is set | |
728 | */ | |
729 | ||
730 | int | |
731 | smtp_ferror(void) | |
732 | { | |
733 | errno = smtp_had_error; | |
734 | return smtp_had_error; | |
735 | } | |
736 | ||
737 | ||
738 | ||
58eb016e PH |
739 | /************************************************* |
740 | * Test for characters in the SMTP buffer * | |
741 | *************************************************/ | |
742 | ||
743 | /* Used at the end of a message | |
744 | ||
745 | Arguments: none | |
746 | Returns: TRUE/FALSE | |
747 | */ | |
748 | ||
749 | BOOL | |
750 | smtp_buffered(void) | |
751 | { | |
752 | return smtp_inptr < smtp_inend; | |
753 | } | |
754 | ||
755 | ||
059ec3d9 PH |
756 | |
757 | /************************************************* | |
758 | * Write formatted string to SMTP channel * | |
759 | *************************************************/ | |
760 | ||
761 | /* This is a separate function so that we don't have to repeat everything for | |
762 | TLS support or debugging. It is global so that the daemon and the | |
763 | authentication functions can use it. It does not return any error indication, | |
764 | because major problems such as dropped connections won't show up till an output | |
765 | flush for non-TLS connections. The smtp_fflush() function is available for | |
766 | checking that: for convenience, TLS output errors are remembered here so that | |
767 | they are also picked up later by smtp_fflush(). | |
768 | ||
769 | Arguments: | |
770 | format format string | |
771 | ... optional arguments | |
772 | ||
773 | Returns: nothing | |
774 | */ | |
775 | ||
776 | void | |
1ba28e2b | 777 | smtp_printf(const char *format, ...) |
059ec3d9 PH |
778 | { |
779 | va_list ap; | |
780 | ||
ce552449 NM |
781 | va_start(ap, format); |
782 | smtp_vprintf(format, ap); | |
783 | va_end(ap); | |
784 | } | |
785 | ||
786 | /* This is split off so that verify.c:respond_printf() can, in effect, call | |
787 | smtp_printf(), bearing in mind that in C a vararg function can't directly | |
fb08281f | 788 | call another vararg function, only a function which accepts a va_list. */ |
ce552449 NM |
789 | |
790 | void | |
1ba28e2b | 791 | smtp_vprintf(const char *format, va_list ap) |
ce552449 | 792 | { |
fb08281f DW |
793 | BOOL yield; |
794 | ||
795 | yield = string_vformat(big_buffer, big_buffer_size, format, ap); | |
ce552449 | 796 | |
059ec3d9 PH |
797 | DEBUG(D_receive) |
798 | { | |
fb08281f DW |
799 | void *reset_point = store_get(0); |
800 | uschar *msg_copy, *cr, *end; | |
801 | msg_copy = string_copy(big_buffer); | |
802 | end = msg_copy + Ustrlen(msg_copy); | |
803 | while ((cr = Ustrchr(msg_copy, '\r')) != NULL) /* lose CRs */ | |
804 | memmove(cr, cr + 1, (end--) - cr); | |
805 | debug_printf("SMTP>> %s", msg_copy); | |
806 | store_reset(reset_point); | |
059ec3d9 PH |
807 | } |
808 | ||
fb08281f | 809 | if (!yield) |
2679d413 PH |
810 | { |
811 | log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_printf()"); | |
812 | smtp_closedown(US"Unexpected error"); | |
813 | exim_exit(EXIT_FAILURE); | |
814 | } | |
2679d413 PH |
815 | |
816 | /* If this is the first output for a (non-batch) RCPT command, see if all RCPTs | |
817 | have had the same. Note: this code is also present in smtp_respond(). It would | |
818 | be tidier to have it only in one place, but when it was added, it was easier to | |
819 | do it that way, so as not to have to mess with the code for the RCPT command, | |
820 | which sometimes uses smtp_printf() and sometimes smtp_respond(). */ | |
821 | ||
822 | if (rcpt_in_progress) | |
823 | { | |
824 | if (rcpt_smtp_response == NULL) | |
825 | rcpt_smtp_response = string_copy(big_buffer); | |
826 | else if (rcpt_smtp_response_same && | |
827 | Ustrcmp(rcpt_smtp_response, big_buffer) != 0) | |
828 | rcpt_smtp_response_same = FALSE; | |
829 | rcpt_in_progress = FALSE; | |
830 | } | |
059ec3d9 | 831 | |
2679d413 | 832 | /* Now write the string */ |
059ec3d9 PH |
833 | |
834 | #ifdef SUPPORT_TLS | |
817d9f57 | 835 | if (tls_in.active >= 0) |
059ec3d9 | 836 | { |
817d9f57 JH |
837 | if (tls_write(TRUE, big_buffer, Ustrlen(big_buffer)) < 0) |
838 | smtp_write_error = -1; | |
059ec3d9 PH |
839 | } |
840 | else | |
841 | #endif | |
842 | ||
2679d413 | 843 | if (fprintf(smtp_out, "%s", big_buffer) < 0) smtp_write_error = -1; |
059ec3d9 PH |
844 | } |
845 | ||
846 | ||
847 | ||
848 | /************************************************* | |
849 | * Flush SMTP out and check for error * | |
850 | *************************************************/ | |
851 | ||
852 | /* This function isn't currently used within Exim (it detects errors when it | |
853 | tries to read the next SMTP input), but is available for use in local_scan(). | |
854 | For non-TLS connections, it flushes the output and checks for errors. For | |
855 | TLS-connections, it checks for a previously-detected TLS write error. | |
856 | ||
857 | Arguments: none | |
858 | Returns: 0 for no error; -1 after an error | |
859 | */ | |
860 | ||
861 | int | |
862 | smtp_fflush(void) | |
863 | { | |
817d9f57 | 864 | if (tls_in.active < 0 && fflush(smtp_out) != 0) smtp_write_error = -1; |
059ec3d9 PH |
865 | return smtp_write_error; |
866 | } | |
867 | ||
868 | ||
869 | ||
870 | /************************************************* | |
871 | * SMTP command read timeout * | |
872 | *************************************************/ | |
873 | ||
874 | /* Signal handler for timing out incoming SMTP commands. This attempts to | |
875 | finish off tidily. | |
876 | ||
877 | Argument: signal number (SIGALRM) | |
878 | Returns: nothing | |
879 | */ | |
880 | ||
881 | static void | |
882 | command_timeout_handler(int sig) | |
883 | { | |
884 | sig = sig; /* Keep picky compilers happy */ | |
885 | log_write(L_lost_incoming_connection, | |
886 | LOG_MAIN, "SMTP command timeout on%s connection from %s", | |
817d9f57 | 887 | (tls_in.active >= 0)? " TLS" : "", |
059ec3d9 PH |
888 | host_and_ident(FALSE)); |
889 | if (smtp_batched_input) | |
890 | moan_smtp_batch(NULL, "421 SMTP command timeout"); /* Does not return */ | |
8f128379 PH |
891 | smtp_notquit_exit(US"command-timeout", US"421", |
892 | US"%s: SMTP command timeout - closing connection", smtp_active_hostname); | |
059ec3d9 PH |
893 | exim_exit(EXIT_FAILURE); |
894 | } | |
895 | ||
896 | ||
897 | ||
898 | /************************************************* | |
899 | * SIGTERM received * | |
900 | *************************************************/ | |
901 | ||
902 | /* Signal handler for handling SIGTERM. Again, try to finish tidily. | |
903 | ||
904 | Argument: signal number (SIGTERM) | |
905 | Returns: nothing | |
906 | */ | |
907 | ||
908 | static void | |
909 | command_sigterm_handler(int sig) | |
910 | { | |
911 | sig = sig; /* Keep picky compilers happy */ | |
912 | log_write(0, LOG_MAIN, "%s closed after SIGTERM", smtp_get_connection_info()); | |
913 | if (smtp_batched_input) | |
914 | moan_smtp_batch(NULL, "421 SIGTERM received"); /* Does not return */ | |
8f128379 PH |
915 | smtp_notquit_exit(US"signal-exit", US"421", |
916 | US"%s: Service not available - closing connection", smtp_active_hostname); | |
059ec3d9 PH |
917 | exim_exit(EXIT_FAILURE); |
918 | } | |
919 | ||
920 | ||
921 | ||
a14e5636 | 922 | |
cee5f132 | 923 | #ifdef SUPPORT_PROXY |
a3bddaa8 TL |
924 | /************************************************* |
925 | * Restore socket timeout to previous value * | |
926 | *************************************************/ | |
927 | /* If the previous value was successfully retrieved, restore | |
928 | it before returning control to the non-proxy routines | |
929 | ||
930 | Arguments: fd - File descriptor for input | |
931 | get_ok - Successfully retrieved previous values | |
932 | tvtmp - Time struct with previous values | |
933 | vslen - Length of time struct | |
934 | Returns: none | |
935 | */ | |
936 | static void | |
f267271d | 937 | restore_socket_timeout(int fd, int get_ok, struct timeval * tvtmp, socklen_t vslen) |
a3bddaa8 TL |
938 | { |
939 | if (get_ok == 0) | |
f267271d | 940 | (void) setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS tvtmp, vslen); |
a3bddaa8 TL |
941 | } |
942 | ||
a3c86431 TL |
943 | /************************************************* |
944 | * Check if host is required proxy host * | |
945 | *************************************************/ | |
946 | /* The function determines if inbound host will be a regular smtp host | |
1811cb4c JH |
947 | or if it is configured that it must use Proxy Protocol. A local |
948 | connection cannot. | |
a3c86431 TL |
949 | |
950 | Arguments: none | |
951 | Returns: bool | |
952 | */ | |
953 | ||
954 | static BOOL | |
955 | check_proxy_protocol_host() | |
956 | { | |
957 | int rc; | |
a3c86431 | 958 | |
1811cb4c JH |
959 | if ( sender_host_address |
960 | && (rc = verify_check_this_host(CUSS &hosts_proxy, NULL, NULL, | |
961 | sender_host_address, NULL)) == OK) | |
a3c86431 TL |
962 | { |
963 | DEBUG(D_receive) | |
964 | debug_printf("Detected proxy protocol configured host\n"); | |
965 | proxy_session = TRUE; | |
966 | } | |
967 | return proxy_session; | |
968 | } | |
969 | ||
970 | ||
3f251b3c PP |
971 | /************************************************* |
972 | * Read data until newline or end of buffer * | |
973 | *************************************************/ | |
974 | /* While SMTP is server-speaks-first, TLS is client-speaks-first, so we can't | |
975 | read an entire buffer and assume there will be nothing past a proxy protocol | |
976 | header. Our approach normally is to use stdio, but again that relies upon | |
977 | "STARTTLS\r\n" and a server response before the client starts TLS handshake, or | |
978 | reading _nothing_ before client TLS handshake. So we don't want to use the | |
979 | usual buffering reads which may read enough to block TLS starting. | |
980 | ||
981 | So unfortunately we're down to "read one byte at a time, with a syscall each, | |
982 | and expect a little overhead", for all proxy-opened connections which are v1, | |
983 | just to handle the TLS-on-connect case. Since SSL functions wrap the | |
984 | underlying fd, we can't assume that we can feed them any already-read content. | |
985 | ||
986 | We need to know where to read to, the max capacity, and we'll read until we | |
987 | get a CR and one more character. Let the caller scream if it's CR+!LF. | |
988 | ||
989 | Return the amount read. | |
990 | */ | |
991 | ||
992 | static int | |
da88acae | 993 | swallow_until_crlf(int fd, uschar *base, int already, int capacity) |
3f251b3c | 994 | { |
2c0f3ea1 JH |
995 | uschar *to = base + already; |
996 | uschar *cr; | |
997 | int have = 0; | |
998 | int ret; | |
999 | int last = 0; | |
1000 | ||
1001 | /* For "PROXY UNKNOWN\r\n" we, at time of writing, expect to have read | |
1002 | up through the \r; for the _normal_ case, we haven't yet seen the \r. */ | |
da88acae | 1003 | |
2c0f3ea1 JH |
1004 | cr = memchr(base, '\r', already); |
1005 | if (cr != NULL) | |
1006 | { | |
1007 | if ((cr - base) < already - 1) | |
da88acae | 1008 | { |
2c0f3ea1 JH |
1009 | /* \r and presumed \n already within what we have; probably not |
1010 | actually proxy protocol, but abort cleanly. */ | |
1011 | return 0; | |
da88acae | 1012 | } |
2c0f3ea1 JH |
1013 | /* \r is last character read, just need one more. */ |
1014 | last = 1; | |
1015 | } | |
1016 | ||
1017 | while (capacity > 0) | |
1018 | { | |
1019 | do { ret = recv(fd, to, 1, 0); } while (ret == -1 && errno == EINTR); | |
1020 | if (ret == -1) | |
1021 | return -1; | |
1022 | have++; | |
1023 | if (last) | |
1024 | return have; | |
1025 | if (*to == '\r') | |
1026 | last = 1; | |
1027 | capacity--; | |
1028 | to++; | |
1029 | } | |
1030 | ||
1031 | /* reached end without having room for a final newline, abort */ | |
1032 | errno = EOVERFLOW; | |
1033 | return -1; | |
3f251b3c PP |
1034 | } |
1035 | ||
a3c86431 TL |
1036 | /************************************************* |
1037 | * Setup host for proxy protocol * | |
1038 | *************************************************/ | |
1039 | /* The function configures the connection based on a header from the | |
1040 | inbound host to use Proxy Protocol. The specification is very exact | |
1041 | so exit with an error if do not find the exact required pieces. This | |
1042 | includes an incorrect number of spaces separating args. | |
1043 | ||
1044 | Arguments: none | |
f267271d | 1045 | Returns: Boolean success |
a3c86431 TL |
1046 | */ |
1047 | ||
1811cb4c | 1048 | static void |
a3c86431 TL |
1049 | setup_proxy_protocol_host() |
1050 | { | |
1051 | union { | |
1052 | struct { | |
1053 | uschar line[108]; | |
1054 | } v1; | |
1055 | struct { | |
1056 | uschar sig[12]; | |
36719342 TL |
1057 | uint8_t ver_cmd; |
1058 | uint8_t fam; | |
1059 | uint16_t len; | |
a3c86431 TL |
1060 | union { |
1061 | struct { /* TCP/UDP over IPv4, len = 12 */ | |
1062 | uint32_t src_addr; | |
1063 | uint32_t dst_addr; | |
1064 | uint16_t src_port; | |
1065 | uint16_t dst_port; | |
1066 | } ip4; | |
1067 | struct { /* TCP/UDP over IPv6, len = 36 */ | |
1068 | uint8_t src_addr[16]; | |
1069 | uint8_t dst_addr[16]; | |
1070 | uint16_t src_port; | |
1071 | uint16_t dst_port; | |
1072 | } ip6; | |
1073 | struct { /* AF_UNIX sockets, len = 216 */ | |
1074 | uschar src_addr[108]; | |
1075 | uschar dst_addr[108]; | |
1076 | } unx; | |
1077 | } addr; | |
1078 | } v2; | |
1079 | } hdr; | |
1080 | ||
eb57651e TL |
1081 | /* Temp variables used in PPv2 address:port parsing */ |
1082 | uint16_t tmpport; | |
1083 | char tmpip[INET_ADDRSTRLEN]; | |
1084 | struct sockaddr_in tmpaddr; | |
1085 | char tmpip6[INET6_ADDRSTRLEN]; | |
1086 | struct sockaddr_in6 tmpaddr6; | |
1087 | ||
da88acae PP |
1088 | /* We can't read "all data until end" because while SMTP is |
1089 | server-speaks-first, the TLS handshake is client-speaks-first, so for | |
1090 | TLS-on-connect ports the proxy protocol header will usually be immediately | |
1091 | followed by a TLS handshake, and with N TLS libraries, we can't reliably | |
1092 | reinject data for reading by those. So instead we first read "enough to be | |
1093 | safely read within the header, and figure out how much more to read". | |
1094 | For v1 we will later read to the end-of-line, for v2 we will read based upon | |
1095 | the stated length. | |
1096 | ||
1097 | The v2 sig is 12 octets, and another 4 gets us the length, so we know how much | |
1098 | data is needed total. For v1, where the line looks like: | |
1099 | PROXY TCPn L3src L3dest SrcPort DestPort \r\n | |
1100 | ||
1101 | However, for v1 there's also `PROXY UNKNOWN\r\n` which is only 15 octets. | |
1102 | We seem to support that. So, if we read 14 octets then we can tell if we're | |
1103 | v2 or v1. If we're v1, we can continue reading as normal. | |
1104 | ||
1105 | If we're v2, we can't slurp up the entire header. We need the length in the | |
1106 | 15th & 16th octets, then to read everything after that. | |
1107 | ||
1108 | So to safely handle v1 and v2, with client-sent-first supported correctly, | |
1109 | we have to do a minimum of 3 read calls, not 1. Eww. | |
1110 | */ | |
1111 | ||
1112 | #define PROXY_INITIAL_READ 14 | |
1113 | #define PROXY_V2_HEADER_SIZE 16 | |
1114 | #if PROXY_INITIAL_READ > PROXY_V2_HEADER_SIZE | |
1115 | # error Code bug in sizes of data to read for proxy usage | |
1116 | #endif | |
1117 | ||
eb57651e | 1118 | int get_ok = 0; |
f267271d JH |
1119 | int size, ret; |
1120 | int fd = fileno(smtp_in); | |
36719342 | 1121 | const char v2sig[12] = "\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A"; |
9e7e0f6a | 1122 | uschar * iptype; /* To display debug info */ |
a3c86431 | 1123 | struct timeval tv; |
a3bddaa8 | 1124 | struct timeval tvtmp; |
f267271d | 1125 | socklen_t vslen = sizeof(struct timeval); |
1811cb4c | 1126 | BOOL yield = FALSE; |
a3c86431 | 1127 | |
a3bddaa8 | 1128 | /* Save current socket timeout values */ |
f267271d | 1129 | get_ok = getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tvtmp, &vslen); |
a3bddaa8 | 1130 | |
a3c86431 TL |
1131 | /* Proxy Protocol host must send header within a short time |
1132 | (default 3 seconds) or it's considered invalid */ | |
1133 | tv.tv_sec = PROXY_NEGOTIATION_TIMEOUT_SEC; | |
1134 | tv.tv_usec = PROXY_NEGOTIATION_TIMEOUT_USEC; | |
f267271d | 1135 | if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tv, sizeof(tv)) < 0) |
1811cb4c | 1136 | goto bad; |
a3bddaa8 | 1137 | |
a3c86431 TL |
1138 | do |
1139 | { | |
eb57651e | 1140 | /* The inbound host was declared to be a Proxy Protocol host, so |
2c0f3ea1 JH |
1141 | don't do a PEEK into the data, actually slurp up enough to be |
1142 | "safe". Can't take it all because TLS-on-connect clients follow | |
1143 | immediately with TLS handshake. */ | |
3f251b3c | 1144 | ret = recv(fd, &hdr, PROXY_INITIAL_READ, 0); |
a3c86431 TL |
1145 | } |
1146 | while (ret == -1 && errno == EINTR); | |
1147 | ||
1148 | if (ret == -1) | |
f267271d | 1149 | goto proxyfail; |
a3c86431 | 1150 | |
da88acae PP |
1151 | /* For v2, handle reading the length, and then the rest. */ |
1152 | if ((ret == PROXY_INITIAL_READ) && (memcmp(&hdr.v2, v2sig, sizeof(v2sig)) == 0)) | |
a3c86431 | 1153 | { |
da88acae PP |
1154 | int retmore; |
1155 | uint8_t ver; | |
1156 | ||
1157 | /* First get the length fields. */ | |
1158 | do | |
1159 | { | |
1160 | retmore = recv(fd, (uschar*)&hdr + ret, PROXY_V2_HEADER_SIZE - PROXY_INITIAL_READ, 0); | |
1161 | } while (retmore == -1 && errno == EINTR); | |
1162 | if (retmore == -1) | |
3f251b3c | 1163 | goto proxyfail; |
da88acae | 1164 | ret += retmore; |
3f251b3c PP |
1165 | |
1166 | ver = (hdr.v2.ver_cmd & 0xf0) >> 4; | |
36719342 TL |
1167 | |
1168 | /* May 2014: haproxy combined the version and command into one byte to | |
2c0f3ea1 JH |
1169 | allow two full bytes for the length field in order to proxy SSL |
1170 | connections. SSL Proxy is not supported in this version of Exim, but | |
1171 | must still separate values here. */ | |
36719342 TL |
1172 | |
1173 | if (ver != 0x02) | |
1174 | { | |
1175 | DEBUG(D_receive) debug_printf("Invalid Proxy Protocol version: %d\n", ver); | |
1176 | goto proxyfail; | |
1177 | } | |
da88acae | 1178 | |
36719342 | 1179 | /* The v2 header will always be 16 bytes per the spec. */ |
5d036699 | 1180 | size = 16 + ntohs(hdr.v2.len); |
da88acae PP |
1181 | DEBUG(D_receive) debug_printf("Detected PROXYv2 header, size %d (limit %d)\n", |
1182 | size, (int)sizeof(hdr)); | |
1183 | ||
1184 | /* We should now have 16 octets (PROXY_V2_HEADER_SIZE), and we know the total | |
1185 | amount that we need. Double-check that the size is not unreasonable, then | |
1186 | get the rest. */ | |
1187 | if (size > sizeof(hdr)) | |
a3c86431 | 1188 | { |
da88acae | 1189 | DEBUG(D_receive) debug_printf("PROXYv2 header size unreasonably large; security attack?\n"); |
a3c86431 TL |
1190 | goto proxyfail; |
1191 | } | |
da88acae PP |
1192 | |
1193 | do | |
1194 | { | |
1195 | do | |
1196 | { | |
1197 | retmore = recv(fd, (uschar*)&hdr + ret, size-ret, 0); | |
1198 | } while (retmore == -1 && errno == EINTR); | |
1199 | if (retmore == -1) | |
1200 | goto proxyfail; | |
1201 | ret += retmore; | |
1202 | DEBUG(D_receive) debug_printf("PROXYv2: have %d/%d required octets\n", ret, size); | |
1203 | } while (ret < size); | |
1204 | ||
1205 | } /* end scope for getting rest of data for v2 */ | |
1206 | ||
1207 | /* At this point: if PROXYv2, we've read the exact size required for all data; | |
1208 | if PROXYv1 then we've read "less than required for any valid line" and should | |
1209 | read the rest". */ | |
1210 | ||
1211 | if (ret >= 16 && memcmp(&hdr.v2, v2sig, 12) == 0) | |
1212 | { | |
1213 | uint8_t cmd = (hdr.v2.ver_cmd & 0x0f); | |
1214 | ||
36719342 | 1215 | switch (cmd) |
a3c86431 TL |
1216 | { |
1217 | case 0x01: /* PROXY command */ | |
1218 | switch (hdr.v2.fam) | |
1219 | { | |
eb57651e TL |
1220 | case 0x11: /* TCPv4 address type */ |
1221 | iptype = US"IPv4"; | |
1222 | tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.src_addr; | |
5d036699 JH |
1223 | inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip)); |
1224 | if (!string_is_ip_address(US tmpip, NULL)) | |
eb57651e TL |
1225 | { |
1226 | DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype); | |
f267271d | 1227 | goto proxyfail; |
eb57651e | 1228 | } |
e6d2a989 | 1229 | proxy_local_address = sender_host_address; |
eb57651e TL |
1230 | sender_host_address = string_copy(US tmpip); |
1231 | tmpport = ntohs(hdr.v2.addr.ip4.src_port); | |
e6d2a989 | 1232 | proxy_local_port = sender_host_port; |
eb57651e TL |
1233 | sender_host_port = tmpport; |
1234 | /* Save dest ip/port */ | |
1235 | tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.dst_addr; | |
5d036699 JH |
1236 | inet_ntop(AF_INET, &tmpaddr.sin_addr, CS &tmpip, sizeof(tmpip)); |
1237 | if (!string_is_ip_address(US tmpip, NULL)) | |
eb57651e TL |
1238 | { |
1239 | DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype); | |
f267271d | 1240 | goto proxyfail; |
eb57651e | 1241 | } |
7a2fa0bc | 1242 | proxy_external_address = string_copy(US tmpip); |
eb57651e | 1243 | tmpport = ntohs(hdr.v2.addr.ip4.dst_port); |
7a2fa0bc | 1244 | proxy_external_port = tmpport; |
a3c86431 | 1245 | goto done; |
eb57651e TL |
1246 | case 0x21: /* TCPv6 address type */ |
1247 | iptype = US"IPv6"; | |
1248 | memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.src_addr, 16); | |
5d036699 JH |
1249 | inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6)); |
1250 | if (!string_is_ip_address(US tmpip6, NULL)) | |
eb57651e TL |
1251 | { |
1252 | DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype); | |
f267271d | 1253 | goto proxyfail; |
eb57651e | 1254 | } |
e6d2a989 | 1255 | proxy_local_address = sender_host_address; |
eb57651e TL |
1256 | sender_host_address = string_copy(US tmpip6); |
1257 | tmpport = ntohs(hdr.v2.addr.ip6.src_port); | |
e6d2a989 | 1258 | proxy_local_port = sender_host_port; |
eb57651e TL |
1259 | sender_host_port = tmpport; |
1260 | /* Save dest ip/port */ | |
1261 | memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.dst_addr, 16); | |
5d036699 JH |
1262 | inet_ntop(AF_INET6, &tmpaddr6.sin6_addr, CS &tmpip6, sizeof(tmpip6)); |
1263 | if (!string_is_ip_address(US tmpip6, NULL)) | |
eb57651e TL |
1264 | { |
1265 | DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype); | |
f267271d | 1266 | goto proxyfail; |
eb57651e | 1267 | } |
7a2fa0bc | 1268 | proxy_external_address = string_copy(US tmpip6); |
eb57651e | 1269 | tmpport = ntohs(hdr.v2.addr.ip6.dst_port); |
7a2fa0bc | 1270 | proxy_external_port = tmpport; |
a3c86431 | 1271 | goto done; |
eb57651e TL |
1272 | default: |
1273 | DEBUG(D_receive) | |
1274 | debug_printf("Unsupported PROXYv2 connection type: 0x%02x\n", | |
1275 | hdr.v2.fam); | |
1276 | goto proxyfail; | |
a3c86431 TL |
1277 | } |
1278 | /* Unsupported protocol, keep local connection address */ | |
1279 | break; | |
1280 | case 0x00: /* LOCAL command */ | |
1281 | /* Keep local connection address for LOCAL */ | |
9e7e0f6a | 1282 | iptype = US"local"; |
a3c86431 TL |
1283 | break; |
1284 | default: | |
eb57651e | 1285 | DEBUG(D_receive) |
36719342 | 1286 | debug_printf("Unsupported PROXYv2 command: 0x%x\n", cmd); |
a3c86431 TL |
1287 | goto proxyfail; |
1288 | } | |
1289 | } | |
5d036699 | 1290 | else if (ret >= 8 && memcmp(hdr.v1.line, "PROXY", 5) == 0) |
a3c86431 | 1291 | { |
3f251b3c PP |
1292 | uschar *p; |
1293 | uschar *end; | |
a3c86431 TL |
1294 | uschar *sp; /* Utility variables follow */ |
1295 | int tmp_port; | |
3f251b3c | 1296 | int r2; |
a3c86431 TL |
1297 | char *endc; |
1298 | ||
3f251b3c | 1299 | /* get the rest of the line */ |
da88acae | 1300 | r2 = swallow_until_crlf(fd, (uschar*)&hdr, ret, sizeof(hdr)-ret); |
3f251b3c PP |
1301 | if (r2 == -1) |
1302 | goto proxyfail; | |
1303 | ret += r2; | |
1304 | ||
1305 | p = string_copy(hdr.v1.line); | |
1306 | end = memchr(p, '\r', ret - 1); | |
1307 | ||
da88acae | 1308 | if (!end || (end == (uschar*)&hdr + ret) || end[1] != '\n') |
a3c86431 TL |
1309 | { |
1310 | DEBUG(D_receive) debug_printf("Partial or invalid PROXY header\n"); | |
1311 | goto proxyfail; | |
1312 | } | |
1313 | *end = '\0'; /* Terminate the string */ | |
a5d4db40 | 1314 | size = end + 2 - p; /* Skip header + CRLF */ |
a3c86431 | 1315 | DEBUG(D_receive) debug_printf("Detected PROXYv1 header\n"); |
3f251b3c | 1316 | DEBUG(D_receive) debug_printf("Bytes read not within PROXY header: %d\n", ret - size); |
a3c86431 | 1317 | /* Step through the string looking for the required fields. Ensure |
2c0f3ea1 | 1318 | strict adherence to required formatting, exit for any error. */ |
a3c86431 TL |
1319 | p += 5; |
1320 | if (!isspace(*(p++))) | |
1321 | { | |
1322 | DEBUG(D_receive) debug_printf("Missing space after PROXY command\n"); | |
1323 | goto proxyfail; | |
1324 | } | |
1325 | if (!Ustrncmp(p, CCS"TCP4", 4)) | |
1326 | iptype = US"IPv4"; | |
1327 | else if (!Ustrncmp(p,CCS"TCP6", 4)) | |
1328 | iptype = US"IPv6"; | |
1329 | else if (!Ustrncmp(p,CCS"UNKNOWN", 7)) | |
1330 | { | |
1331 | iptype = US"Unknown"; | |
1332 | goto done; | |
1333 | } | |
1334 | else | |
1335 | { | |
1336 | DEBUG(D_receive) debug_printf("Invalid TCP type\n"); | |
1337 | goto proxyfail; | |
1338 | } | |
1339 | ||
1340 | p += Ustrlen(iptype); | |
1341 | if (!isspace(*(p++))) | |
1342 | { | |
1343 | DEBUG(D_receive) debug_printf("Missing space after TCP4/6 command\n"); | |
1344 | goto proxyfail; | |
1345 | } | |
1346 | /* Find the end of the arg */ | |
1347 | if ((sp = Ustrchr(p, ' ')) == NULL) | |
1348 | { | |
1349 | DEBUG(D_receive) | |
1350 | debug_printf("Did not find proxied src %s\n", iptype); | |
1351 | goto proxyfail; | |
1352 | } | |
1353 | *sp = '\0'; | |
5d036699 | 1354 | if(!string_is_ip_address(p, NULL)) |
a3c86431 TL |
1355 | { |
1356 | DEBUG(D_receive) | |
1357 | debug_printf("Proxied src arg is not an %s address\n", iptype); | |
1358 | goto proxyfail; | |
1359 | } | |
e6d2a989 | 1360 | proxy_local_address = sender_host_address; |
a3c86431 TL |
1361 | sender_host_address = p; |
1362 | p = sp + 1; | |
1363 | if ((sp = Ustrchr(p, ' ')) == NULL) | |
1364 | { | |
1365 | DEBUG(D_receive) | |
1366 | debug_printf("Did not find proxy dest %s\n", iptype); | |
1367 | goto proxyfail; | |
1368 | } | |
1369 | *sp = '\0'; | |
5d036699 | 1370 | if(!string_is_ip_address(p, NULL)) |
a3c86431 TL |
1371 | { |
1372 | DEBUG(D_receive) | |
1373 | debug_printf("Proxy dest arg is not an %s address\n", iptype); | |
1374 | goto proxyfail; | |
1375 | } | |
7a2fa0bc | 1376 | proxy_external_address = p; |
a3c86431 TL |
1377 | p = sp + 1; |
1378 | if ((sp = Ustrchr(p, ' ')) == NULL) | |
1379 | { | |
1380 | DEBUG(D_receive) debug_printf("Did not find proxied src port\n"); | |
1381 | goto proxyfail; | |
1382 | } | |
1383 | *sp = '\0'; | |
5d036699 | 1384 | tmp_port = strtol(CCS p, &endc, 10); |
a3c86431 TL |
1385 | if (*endc || tmp_port == 0) |
1386 | { | |
1387 | DEBUG(D_receive) | |
1388 | debug_printf("Proxied src port '%s' not an integer\n", p); | |
1389 | goto proxyfail; | |
1390 | } | |
e6d2a989 | 1391 | proxy_local_port = sender_host_port; |
a3c86431 TL |
1392 | sender_host_port = tmp_port; |
1393 | p = sp + 1; | |
1394 | if ((sp = Ustrchr(p, '\0')) == NULL) | |
1395 | { | |
1396 | DEBUG(D_receive) debug_printf("Did not find proxy dest port\n"); | |
1397 | goto proxyfail; | |
1398 | } | |
5d036699 | 1399 | tmp_port = strtol(CCS p, &endc, 10); |
a3c86431 TL |
1400 | if (*endc || tmp_port == 0) |
1401 | { | |
1402 | DEBUG(D_receive) | |
1403 | debug_printf("Proxy dest port '%s' not an integer\n", p); | |
1404 | goto proxyfail; | |
1405 | } | |
7a2fa0bc | 1406 | proxy_external_port = tmp_port; |
a3c86431 | 1407 | /* Already checked for /r /n above. Good V1 header received. */ |
a3c86431 TL |
1408 | } |
1409 | else | |
1410 | { | |
1411 | /* Wrong protocol */ | |
eb57651e | 1412 | DEBUG(D_receive) debug_printf("Invalid proxy protocol version negotiation\n"); |
da88acae | 1413 | (void) swallow_until_crlf(fd, (uschar*)&hdr, ret, sizeof(hdr)-ret); |
a3c86431 TL |
1414 | goto proxyfail; |
1415 | } | |
1416 | ||
1811cb4c JH |
1417 | done: |
1418 | DEBUG(D_receive) | |
1419 | debug_printf("Valid %s sender from Proxy Protocol header\n", iptype); | |
1420 | yield = proxy_session; | |
1421 | ||
1422 | /* Don't flush any potential buffer contents. Any input on proxyfail | |
1423 | should cause a synchronization failure */ | |
1424 | ||
a3c86431 | 1425 | proxyfail: |
1811cb4c | 1426 | restore_socket_timeout(fd, get_ok, &tvtmp, vslen); |
a3c86431 | 1427 | |
1811cb4c JH |
1428 | bad: |
1429 | if (yield) | |
1430 | { | |
1431 | sender_host_name = NULL; | |
1432 | (void) host_name_lookup(); | |
1433 | host_build_sender_fullhost(); | |
1434 | } | |
1435 | else | |
1436 | { | |
1437 | proxy_session_failed = TRUE; | |
1438 | DEBUG(D_receive) | |
1439 | debug_printf("Failure to extract proxied host, only QUIT allowed\n"); | |
1440 | } | |
1441 | ||
1442 | return; | |
a3c86431 TL |
1443 | } |
1444 | #endif | |
1445 | ||
059ec3d9 PH |
1446 | /************************************************* |
1447 | * Read one command line * | |
1448 | *************************************************/ | |
1449 | ||
1450 | /* Strictly, SMTP commands coming over the net are supposed to end with CRLF. | |
1451 | There are sites that don't do this, and in any case internal SMTP probably | |
1452 | should check only for LF. Consequently, we check here for LF only. The line | |
1453 | ends up with [CR]LF removed from its end. If we get an overlong line, treat as | |
3ee512ff PH |
1454 | an unknown command. The command is read into the global smtp_cmd_buffer so that |
1455 | it is available via $smtp_command. | |
059ec3d9 PH |
1456 | |
1457 | The character reading routine sets up a timeout for each block actually read | |
1458 | from the input (which may contain more than one command). We set up a special | |
1459 | signal handler that closes down the session on a timeout. Control does not | |
1460 | return when it runs. | |
1461 | ||
1462 | Arguments: | |
bd8fbe36 JH |
1463 | check_sync if TRUE, check synchronization rules if global option is TRUE |
1464 | buffer_lim maximum to buffer in lower layer | |
059ec3d9 PH |
1465 | |
1466 | Returns: a code identifying the command (enumerated above) | |
1467 | */ | |
1468 | ||
1469 | static int | |
bd8fbe36 | 1470 | smtp_read_command(BOOL check_sync, unsigned buffer_lim) |
059ec3d9 PH |
1471 | { |
1472 | int c; | |
1473 | int ptr = 0; | |
1474 | smtp_cmd_list *p; | |
1475 | BOOL hadnull = FALSE; | |
1476 | ||
1477 | os_non_restarting_signal(SIGALRM, command_timeout_handler); | |
1478 | ||
bd8fbe36 | 1479 | while ((c = (receive_getc)(buffer_lim)) != '\n' && c != EOF) |
059ec3d9 | 1480 | { |
bd8fbe36 | 1481 | if (ptr >= SMTP_CMD_BUFFER_SIZE) |
059ec3d9 PH |
1482 | { |
1483 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
1484 | return OTHER_CMD; | |
1485 | } | |
1486 | if (c == 0) | |
1487 | { | |
1488 | hadnull = TRUE; | |
1489 | c = '?'; | |
1490 | } | |
3ee512ff | 1491 | smtp_cmd_buffer[ptr++] = c; |
059ec3d9 PH |
1492 | } |
1493 | ||
1494 | receive_linecount++; /* For BSMTP errors */ | |
1495 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
1496 | ||
1497 | /* If hit end of file, return pseudo EOF command. Whether we have a | |
1498 | part-line already read doesn't matter, since this is an error state. */ | |
1499 | ||
1500 | if (c == EOF) return EOF_CMD; | |
1501 | ||
1502 | /* Remove any CR and white space at the end of the line, and terminate the | |
1503 | string. */ | |
1504 | ||
3ee512ff PH |
1505 | while (ptr > 0 && isspace(smtp_cmd_buffer[ptr-1])) ptr--; |
1506 | smtp_cmd_buffer[ptr] = 0; | |
059ec3d9 | 1507 | |
3ee512ff | 1508 | DEBUG(D_receive) debug_printf("SMTP<< %s\n", smtp_cmd_buffer); |
059ec3d9 PH |
1509 | |
1510 | /* NULLs are not allowed in SMTP commands */ | |
1511 | ||
1512 | if (hadnull) return BADCHAR_CMD; | |
1513 | ||
1514 | /* Scan command list and return identity, having set the data pointer | |
1515 | to the start of the actual data characters. Check for SMTP synchronization | |
1516 | if required. */ | |
1517 | ||
1518 | for (p = cmd_list; p < cmd_list_end; p++) | |
1519 | { | |
1811cb4c | 1520 | #ifdef SUPPORT_PROXY |
a3c86431 | 1521 | /* Only allow QUIT command if Proxy Protocol parsing failed */ |
1811cb4c JH |
1522 | if (proxy_session && proxy_session_failed && p->cmd != QUIT_CMD) |
1523 | continue; | |
1524 | #endif | |
2f460950 JH |
1525 | if ( p->len |
1526 | && strncmpic(smtp_cmd_buffer, US p->name, p->len) == 0 | |
1527 | && ( smtp_cmd_buffer[p->len-1] == ':' /* "mail from:" or "rcpt to:" */ | |
1528 | || smtp_cmd_buffer[p->len] == 0 | |
1529 | || smtp_cmd_buffer[p->len] == ' ' | |
1530 | ) ) | |
059ec3d9 PH |
1531 | { |
1532 | if (smtp_inptr < smtp_inend && /* Outstanding input */ | |
1533 | p->cmd < sync_cmd_limit && /* Command should sync */ | |
1534 | check_sync && /* Local flag set */ | |
1535 | smtp_enforce_sync && /* Global flag set */ | |
1536 | sender_host_address != NULL && /* Not local input */ | |
1537 | !sender_host_notsocket) /* Really is a socket */ | |
1538 | return BADSYN_CMD; | |
1539 | ||
ca86f471 PH |
1540 | /* The variables $smtp_command and $smtp_command_argument point into the |
1541 | unmodified input buffer. A copy of the latter is taken for actual | |
1542 | processing, so that it can be chopped up into separate parts if necessary, | |
1543 | for example, when processing a MAIL command options such as SIZE that can | |
1544 | follow the sender address. */ | |
059ec3d9 | 1545 | |
3ee512ff | 1546 | smtp_cmd_argument = smtp_cmd_buffer + p->len; |
ca86f471 PH |
1547 | while (isspace(*smtp_cmd_argument)) smtp_cmd_argument++; |
1548 | Ustrcpy(smtp_data_buffer, smtp_cmd_argument); | |
1549 | smtp_cmd_data = smtp_data_buffer; | |
059ec3d9 PH |
1550 | |
1551 | /* Count non-mail commands from those hosts that are controlled in this | |
1552 | way. The default is all hosts. We don't waste effort checking the list | |
1553 | until we get a non-mail command, but then cache the result to save checking | |
1554 | again. If there's a DEFER while checking the host, assume it's in the list. | |
1555 | ||
1556 | Note that one instance of RSET, EHLO/HELO, and STARTTLS is allowed at the | |
1557 | start of each incoming message by fiddling with the value in the table. */ | |
1558 | ||
1559 | if (!p->is_mail_cmd) | |
1560 | { | |
1561 | if (count_nonmail == TRUE_UNSET) count_nonmail = | |
1562 | verify_check_host(&smtp_accept_max_nonmail_hosts) != FAIL; | |
1563 | if (count_nonmail && ++nonmail_command_count > smtp_accept_max_nonmail) | |
1564 | return TOO_MANY_NONMAIL_CMD; | |
1565 | } | |
1566 | ||
ca86f471 PH |
1567 | /* If there is data for a command that does not expect it, generate the |
1568 | error here. */ | |
059ec3d9 | 1569 | |
ca86f471 | 1570 | return (p->has_arg || *smtp_cmd_data == 0)? p->cmd : BADARG_CMD; |
059ec3d9 PH |
1571 | } |
1572 | } | |
1573 | ||
cee5f132 | 1574 | #ifdef SUPPORT_PROXY |
a3c86431 TL |
1575 | /* Only allow QUIT command if Proxy Protocol parsing failed */ |
1576 | if (proxy_session && proxy_session_failed) | |
1577 | return PROXY_FAIL_IGNORE_CMD; | |
1578 | #endif | |
1579 | ||
059ec3d9 PH |
1580 | /* Enforce synchronization for unknown commands */ |
1581 | ||
1582 | if (smtp_inptr < smtp_inend && /* Outstanding input */ | |
1583 | check_sync && /* Local flag set */ | |
1584 | smtp_enforce_sync && /* Global flag set */ | |
1585 | sender_host_address != NULL && /* Not local input */ | |
1586 | !sender_host_notsocket) /* Really is a socket */ | |
1587 | return BADSYN_CMD; | |
1588 | ||
1589 | return OTHER_CMD; | |
1590 | } | |
1591 | ||
1592 | ||
1593 | ||
1594 | /************************************************* | |
1595 | * Forced closedown of call * | |
1596 | *************************************************/ | |
1597 | ||
1598 | /* This function is called from log.c when Exim is dying because of a serious | |
1599 | disaster, and also from some other places. If an incoming non-batched SMTP | |
1600 | channel is open, it swallows the rest of the incoming message if in the DATA | |
1601 | phase, sends the reply string, and gives an error to all subsequent commands | |
1602 | except QUIT. The existence of an SMTP call is detected by the non-NULLness of | |
1603 | smtp_in. | |
1604 | ||
8f128379 PH |
1605 | Arguments: |
1606 | message SMTP reply string to send, excluding the code | |
1607 | ||
059ec3d9 PH |
1608 | Returns: nothing |
1609 | */ | |
1610 | ||
1611 | void | |
1612 | smtp_closedown(uschar *message) | |
1613 | { | |
1614 | if (smtp_in == NULL || smtp_batched_input) return; | |
1615 | receive_swallow_smtp(); | |
1616 | smtp_printf("421 %s\r\n", message); | |
1617 | ||
bd8fbe36 | 1618 | for (;;) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED)) |
059ec3d9 | 1619 | { |
60d10ce7 JH |
1620 | case EOF_CMD: |
1621 | return; | |
059ec3d9 | 1622 | |
60d10ce7 JH |
1623 | case QUIT_CMD: |
1624 | smtp_printf("221 %s closing connection\r\n", smtp_active_hostname); | |
1625 | mac_smtp_fflush(); | |
1626 | return; | |
059ec3d9 | 1627 | |
60d10ce7 JH |
1628 | case RSET_CMD: |
1629 | smtp_printf("250 Reset OK\r\n"); | |
1630 | break; | |
059ec3d9 | 1631 | |
60d10ce7 JH |
1632 | default: |
1633 | smtp_printf("421 %s\r\n", message); | |
1634 | break; | |
059ec3d9 PH |
1635 | } |
1636 | } | |
1637 | ||
1638 | ||
1639 | ||
1640 | ||
1641 | /************************************************* | |
1642 | * Set up connection info for logging * | |
1643 | *************************************************/ | |
1644 | ||
1645 | /* This function is called when logging information about an SMTP connection. | |
1646 | It sets up appropriate source information, depending on the type of connection. | |
dac79d3e PH |
1647 | If sender_fullhost is NULL, we are at a very early stage of the connection; |
1648 | just use the IP address. | |
059ec3d9 PH |
1649 | |
1650 | Argument: none | |
1651 | Returns: a string describing the connection | |
1652 | */ | |
1653 | ||
1654 | uschar * | |
1655 | smtp_get_connection_info(void) | |
1656 | { | |
f5d25c2b JH |
1657 | const uschar * hostname = sender_fullhost |
1658 | ? sender_fullhost : sender_host_address; | |
dac79d3e | 1659 | |
059ec3d9 | 1660 | if (host_checking) |
dac79d3e | 1661 | return string_sprintf("SMTP connection from %s", hostname); |
059ec3d9 PH |
1662 | |
1663 | if (sender_host_unknown || sender_host_notsocket) | |
1664 | return string_sprintf("SMTP connection from %s", sender_ident); | |
1665 | ||
1666 | if (is_inetd) | |
dac79d3e | 1667 | return string_sprintf("SMTP connection from %s (via inetd)", hostname); |
059ec3d9 | 1668 | |
6c6d6e48 | 1669 | if (LOGGING(incoming_interface) && interface_address != NULL) |
dac79d3e | 1670 | return string_sprintf("SMTP connection from %s I=[%s]:%d", hostname, |
059ec3d9 PH |
1671 | interface_address, interface_port); |
1672 | ||
dac79d3e | 1673 | return string_sprintf("SMTP connection from %s", hostname); |
059ec3d9 PH |
1674 | } |
1675 | ||
1676 | ||
1677 | ||
e45a1c37 | 1678 | #ifdef SUPPORT_TLS |
887291d2 JH |
1679 | /* Append TLS-related information to a log line |
1680 | ||
1681 | Arguments: | |
1682 | s String under construction: allocated string to extend, or NULL | |
1683 | sizep Pointer to current allocation size (update on return), or NULL | |
1684 | ptrp Pointer to index for new entries in string (update on return), or NULL | |
1685 | ||
1686 | Returns: Allocated string or NULL | |
1687 | */ | |
e45a1c37 JH |
1688 | static uschar * |
1689 | s_tlslog(uschar * s, int * sizep, int * ptrp) | |
1690 | { | |
1691 | int size = sizep ? *sizep : 0; | |
1692 | int ptr = ptrp ? *ptrp : 0; | |
1693 | ||
6c6d6e48 | 1694 | if (LOGGING(tls_cipher) && tls_in.cipher != NULL) |
e45a1c37 | 1695 | s = string_append(s, &size, &ptr, 2, US" X=", tls_in.cipher); |
6c6d6e48 | 1696 | if (LOGGING(tls_certificate_verified) && tls_in.cipher != NULL) |
e45a1c37 JH |
1697 | s = string_append(s, &size, &ptr, 2, US" CV=", |
1698 | tls_in.certificate_verified? "yes":"no"); | |
6c6d6e48 | 1699 | if (LOGGING(tls_peerdn) && tls_in.peerdn != NULL) |
e45a1c37 JH |
1700 | s = string_append(s, &size, &ptr, 3, US" DN=\"", |
1701 | string_printing(tls_in.peerdn), US"\""); | |
6c6d6e48 | 1702 | if (LOGGING(tls_sni) && tls_in.sni != NULL) |
e45a1c37 JH |
1703 | s = string_append(s, &size, &ptr, 3, US" SNI=\"", |
1704 | string_printing(tls_in.sni), US"\""); | |
1705 | ||
67d81c10 JH |
1706 | if (s) |
1707 | { | |
1708 | s[ptr] = '\0'; | |
1709 | if (sizep) *sizep = size; | |
1710 | if (ptrp) *ptrp = ptr; | |
1711 | } | |
e45a1c37 JH |
1712 | return s; |
1713 | } | |
1714 | #endif | |
1715 | ||
b4ed4da0 PH |
1716 | /************************************************* |
1717 | * Log lack of MAIL if so configured * | |
1718 | *************************************************/ | |
1719 | ||
1720 | /* This function is called when an SMTP session ends. If the log selector | |
1721 | smtp_no_mail is set, write a log line giving some details of what has happened | |
1722 | in the SMTP session. | |
1723 | ||
1724 | Arguments: none | |
1725 | Returns: nothing | |
1726 | */ | |
1727 | ||
1728 | void | |
1729 | smtp_log_no_mail(void) | |
1730 | { | |
1731 | int size, ptr, i; | |
1732 | uschar *s, *sep; | |
1733 | ||
6c6d6e48 | 1734 | if (smtp_mailcmd_count > 0 || !LOGGING(smtp_no_mail)) |
b4ed4da0 PH |
1735 | return; |
1736 | ||
1737 | s = NULL; | |
1738 | size = ptr = 0; | |
1739 | ||
1740 | if (sender_host_authenticated != NULL) | |
1741 | { | |
1742 | s = string_append(s, &size, &ptr, 2, US" A=", sender_host_authenticated); | |
1743 | if (authenticated_id != NULL) | |
1744 | s = string_append(s, &size, &ptr, 2, US":", authenticated_id); | |
1745 | } | |
1746 | ||
1747 | #ifdef SUPPORT_TLS | |
e45a1c37 | 1748 | s = s_tlslog(s, &size, &ptr); |
3f0945ff | 1749 | #endif |
b4ed4da0 PH |
1750 | |
1751 | sep = (smtp_connection_had[SMTP_HBUFF_SIZE-1] != SCH_NONE)? | |
1752 | US" C=..." : US" C="; | |
1753 | for (i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++) | |
1754 | { | |
1755 | if (smtp_connection_had[i] != SCH_NONE) | |
1756 | { | |
1757 | s = string_append(s, &size, &ptr, 2, sep, | |
1758 | smtp_names[smtp_connection_had[i]]); | |
1759 | sep = US","; | |
1760 | } | |
1761 | } | |
1762 | ||
1763 | for (i = 0; i < smtp_ch_index; i++) | |
1764 | { | |
1765 | s = string_append(s, &size, &ptr, 2, sep, smtp_names[smtp_connection_had[i]]); | |
1766 | sep = US","; | |
1767 | } | |
1768 | ||
1769 | if (s != NULL) s[ptr] = 0; else s = US""; | |
1770 | log_write(0, LOG_MAIN, "no MAIL in SMTP connection from %s D=%s%s", | |
1771 | host_and_ident(FALSE), | |
19050083 JH |
1772 | readconf_printtime( (int) ((long)time(NULL) - (long)smtp_connection_start)), |
1773 | s); | |
b4ed4da0 PH |
1774 | } |
1775 | ||
1776 | ||
1777 | ||
059ec3d9 PH |
1778 | /************************************************* |
1779 | * Check HELO line and set sender_helo_name * | |
1780 | *************************************************/ | |
1781 | ||
1782 | /* Check the format of a HELO line. The data for HELO/EHLO is supposed to be | |
1783 | the domain name of the sending host, or an ip literal in square brackets. The | |
4c04137d | 1784 | argument is placed in sender_helo_name, which is in malloc store, because it |
059ec3d9 PH |
1785 | must persist over multiple incoming messages. If helo_accept_junk is set, this |
1786 | host is permitted to send any old junk (needed for some broken hosts). | |
1787 | Otherwise, helo_allow_chars can be used for rogue characters in general | |
1788 | (typically people want to let in underscores). | |
1789 | ||
1790 | Argument: | |
1791 | s the data portion of the line (already past any white space) | |
1792 | ||
1793 | Returns: TRUE or FALSE | |
1794 | */ | |
1795 | ||
1796 | static BOOL | |
1797 | check_helo(uschar *s) | |
1798 | { | |
1799 | uschar *start = s; | |
1800 | uschar *end = s + Ustrlen(s); | |
1801 | BOOL yield = helo_accept_junk; | |
1802 | ||
1803 | /* Discard any previous helo name */ | |
1804 | ||
1805 | if (sender_helo_name != NULL) | |
1806 | { | |
1807 | store_free(sender_helo_name); | |
1808 | sender_helo_name = NULL; | |
1809 | } | |
1810 | ||
1811 | /* Skip tests if junk is permitted. */ | |
1812 | ||
1813 | if (!yield) | |
1814 | { | |
1815 | /* Allow the new standard form for IPv6 address literals, namely, | |
1816 | [IPv6:....], and because someone is bound to use it, allow an equivalent | |
1817 | IPv4 form. Allow plain addresses as well. */ | |
1818 | ||
1819 | if (*s == '[') | |
1820 | { | |
1821 | if (end[-1] == ']') | |
1822 | { | |
1823 | end[-1] = 0; | |
1824 | if (strncmpic(s, US"[IPv6:", 6) == 0) | |
1825 | yield = (string_is_ip_address(s+6, NULL) == 6); | |
1826 | else if (strncmpic(s, US"[IPv4:", 6) == 0) | |
1827 | yield = (string_is_ip_address(s+6, NULL) == 4); | |
1828 | else | |
1829 | yield = (string_is_ip_address(s+1, NULL) != 0); | |
1830 | end[-1] = ']'; | |
1831 | } | |
1832 | } | |
1833 | ||
1834 | /* Non-literals must be alpha, dot, hyphen, plus any non-valid chars | |
1835 | that have been configured (usually underscore - sigh). */ | |
1836 | ||
1837 | else if (*s != 0) | |
1838 | { | |
1839 | yield = TRUE; | |
1840 | while (*s != 0) | |
1841 | { | |
1842 | if (!isalnum(*s) && *s != '.' && *s != '-' && | |
1843 | Ustrchr(helo_allow_chars, *s) == NULL) | |
1844 | { | |
1845 | yield = FALSE; | |
1846 | break; | |
1847 | } | |
1848 | s++; | |
1849 | } | |
1850 | } | |
1851 | } | |
1852 | ||
1853 | /* Save argument if OK */ | |
1854 | ||
1855 | if (yield) sender_helo_name = string_copy_malloc(start); | |
1856 | return yield; | |
1857 | } | |
1858 | ||
1859 | ||
1860 | ||
1861 | ||
1862 | ||
1863 | /************************************************* | |
1864 | * Extract SMTP command option * | |
1865 | *************************************************/ | |
1866 | ||
ca86f471 | 1867 | /* This function picks the next option setting off the end of smtp_cmd_data. It |
059ec3d9 PH |
1868 | is called for MAIL FROM and RCPT TO commands, to pick off the optional ESMTP |
1869 | things that can appear there. | |
1870 | ||
1871 | Arguments: | |
1872 | name point this at the name | |
1873 | value point this at the data string | |
1874 | ||
1875 | Returns: TRUE if found an option | |
1876 | */ | |
1877 | ||
1878 | static BOOL | |
1879 | extract_option(uschar **name, uschar **value) | |
1880 | { | |
1881 | uschar *n; | |
ca86f471 | 1882 | uschar *v = smtp_cmd_data + Ustrlen(smtp_cmd_data) - 1; |
059ec3d9 PH |
1883 | while (isspace(*v)) v--; |
1884 | v[1] = 0; | |
d7a2c833 JH |
1885 | while (v > smtp_cmd_data && *v != '=' && !isspace(*v)) |
1886 | { | |
1887 | /* Take care to not stop at a space embedded in a quoted local-part */ | |
1888 | ||
1889 | if (*v == '"') do v--; while (*v != '"' && v > smtp_cmd_data+1); | |
1890 | v--; | |
1891 | } | |
059ec3d9 PH |
1892 | |
1893 | n = v; | |
fd98a5c6 JH |
1894 | if (*v == '=') |
1895 | { | |
1896 | while(isalpha(n[-1])) n--; | |
1897 | /* RFC says SP, but TAB seen in wild and other major MTAs accept it */ | |
1898 | if (!isspace(n[-1])) return FALSE; | |
1899 | n[-1] = 0; | |
1900 | } | |
1901 | else | |
1902 | { | |
1903 | n++; | |
1904 | if (v == smtp_cmd_data) return FALSE; | |
1905 | } | |
059ec3d9 | 1906 | *v++ = 0; |
fd98a5c6 | 1907 | *name = n; |
059ec3d9 PH |
1908 | *value = v; |
1909 | return TRUE; | |
1910 | } | |
1911 | ||
1912 | ||
1913 | ||
1914 | ||
1915 | ||
059ec3d9 PH |
1916 | /************************************************* |
1917 | * Reset for new message * | |
1918 | *************************************************/ | |
1919 | ||
1920 | /* This function is called whenever the SMTP session is reset from | |
1921 | within either of the setup functions. | |
1922 | ||
1923 | Argument: the stacking pool storage reset point | |
1924 | Returns: nothing | |
1925 | */ | |
1926 | ||
1927 | static void | |
1928 | smtp_reset(void *reset_point) | |
1929 | { | |
059ec3d9 PH |
1930 | recipients_list = NULL; |
1931 | rcpt_count = rcpt_defer_count = rcpt_fail_count = | |
1932 | raw_recipients_count = recipients_count = recipients_list_max = 0; | |
2e0c1448 | 1933 | message_linecount = 0; |
059ec3d9 | 1934 | message_size = -1; |
71fafd95 | 1935 | acl_added_headers = NULL; |
e7568d51 | 1936 | acl_removed_headers = NULL; |
059ec3d9 | 1937 | queue_only_policy = FALSE; |
2679d413 PH |
1938 | rcpt_smtp_response = NULL; |
1939 | rcpt_smtp_response_same = TRUE; | |
1940 | rcpt_in_progress = FALSE; | |
69358f02 | 1941 | deliver_freeze = FALSE; /* Can be set by ACL */ |
6a3f1455 | 1942 | freeze_tell = freeze_tell_config; /* Can be set by ACL */ |
29aba418 | 1943 | fake_response = OK; /* Can be set by ACL */ |
6951ac6c | 1944 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
1945 | no_mbox_unspool = FALSE; /* Can be set by ACL */ |
1946 | #endif | |
69358f02 | 1947 | submission_mode = FALSE; /* Can be set by ACL */ |
f4ee74ac | 1948 | suppress_local_fixups = suppress_local_fixups_default; /* Can be set by ACL */ |
69358f02 PH |
1949 | active_local_from_check = local_from_check; /* Can be set by ACL */ |
1950 | active_local_sender_retain = local_sender_retain; /* Can be set by ACL */ | |
90341c71 JH |
1951 | sending_ip_address = NULL; |
1952 | return_path = sender_address = NULL; | |
1953 | sender_data = NULL; /* Can be set by ACL */ | |
1954 | deliver_localpart_orig = NULL; | |
1955 | deliver_domain_orig = NULL; | |
1956 | callout_address = NULL; | |
2fe1a124 | 1957 | submission_name = NULL; /* Can be set by ACL */ |
059ec3d9 PH |
1958 | raw_sender = NULL; /* After SMTP rewrite, before qualifying */ |
1959 | sender_address_unrewritten = NULL; /* Set only after verify rewrite */ | |
1960 | sender_verified_list = NULL; /* No senders verified */ | |
1961 | memset(sender_address_cache, 0, sizeof(sender_address_cache)); | |
1962 | memset(sender_domain_cache, 0, sizeof(sender_domain_cache)); | |
6c1c3d1d | 1963 | |
059ec3d9 | 1964 | authenticated_sender = NULL; |
8523533c TK |
1965 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
1966 | bmi_run = 0; | |
1967 | bmi_verdicts = NULL; | |
1968 | #endif | |
90341c71 | 1969 | dnslist_domain = dnslist_matched = NULL; |
80a47a2c | 1970 | #ifndef DISABLE_DKIM |
9e5d6b55 | 1971 | dkim_signers = NULL; |
80a47a2c TK |
1972 | dkim_disable_verify = FALSE; |
1973 | dkim_collect_input = FALSE; | |
f7572e5a | 1974 | #endif |
aa368db3 JH |
1975 | dsn_ret = 0; |
1976 | dsn_envid = NULL; | |
90341c71 | 1977 | deliver_host = deliver_host_address = NULL; /* Can be set by ACL */ |
aa368db3 JH |
1978 | #ifndef DISABLE_PRDR |
1979 | prdr_requested = FALSE; | |
1980 | #endif | |
8523533c TK |
1981 | #ifdef EXPERIMENTAL_SPF |
1982 | spf_header_comment = NULL; | |
1983 | spf_received = NULL; | |
8e669ac1 | 1984 | spf_result = NULL; |
8523533c TK |
1985 | spf_smtp_comment = NULL; |
1986 | #endif | |
8c5d388a | 1987 | #ifdef SUPPORT_I18N |
d1a13eea JH |
1988 | message_smtputf8 = FALSE; |
1989 | #endif | |
059ec3d9 PH |
1990 | body_linecount = body_zerocount = 0; |
1991 | ||
870f6ba8 TF |
1992 | sender_rate = sender_rate_limit = sender_rate_period = NULL; |
1993 | ratelimiters_mail = NULL; /* Updated by ratelimit ACL condition */ | |
1994 | /* Note that ratelimiters_conn persists across resets. */ | |
1995 | ||
38a0a95f | 1996 | /* Reset message ACL variables */ |
47ca6d6c | 1997 | |
38a0a95f | 1998 | acl_var_m = NULL; |
059ec3d9 PH |
1999 | |
2000 | /* The message body variables use malloc store. They may be set if this is | |
2001 | not the first message in an SMTP session and the previous message caused them | |
2002 | to be referenced in an ACL. */ | |
2003 | ||
90341c71 | 2004 | if (message_body) |
059ec3d9 PH |
2005 | { |
2006 | store_free(message_body); | |
2007 | message_body = NULL; | |
2008 | } | |
2009 | ||
90341c71 | 2010 | if (message_body_end) |
059ec3d9 PH |
2011 | { |
2012 | store_free(message_body_end); | |
2013 | message_body_end = NULL; | |
2014 | } | |
2015 | ||
2016 | /* Warning log messages are also saved in malloc store. They are saved to avoid | |
2017 | repetition in the same message, but it seems right to repeat them for different | |
4e88a19f | 2018 | messages. */ |
059ec3d9 | 2019 | |
90341c71 | 2020 | while (acl_warn_logged) |
059ec3d9 PH |
2021 | { |
2022 | string_item *this = acl_warn_logged; | |
2023 | acl_warn_logged = acl_warn_logged->next; | |
2024 | store_free(this); | |
2025 | } | |
90341c71 | 2026 | store_reset(reset_point); |
059ec3d9 PH |
2027 | } |
2028 | ||
2029 | ||
2030 | ||
2031 | ||
2032 | ||
2033 | /************************************************* | |
2034 | * Initialize for incoming batched SMTP message * | |
2035 | *************************************************/ | |
2036 | ||
2037 | /* This function is called from smtp_setup_msg() in the case when | |
2038 | smtp_batched_input is true. This happens when -bS is used to pass a whole batch | |
2039 | of messages in one file with SMTP commands between them. All errors must be | |
2040 | reported by sending a message, and only MAIL FROM, RCPT TO, and DATA are | |
2041 | relevant. After an error on a sender, or an invalid recipient, the remainder | |
2042 | of the message is skipped. The value of received_protocol is already set. | |
2043 | ||
2044 | Argument: none | |
2045 | Returns: > 0 message successfully started (reached DATA) | |
2046 | = 0 QUIT read or end of file reached | |
2047 | < 0 should not occur | |
2048 | */ | |
2049 | ||
2050 | static int | |
2051 | smtp_setup_batch_msg(void) | |
2052 | { | |
2053 | int done = 0; | |
2054 | void *reset_point = store_get(0); | |
2055 | ||
2056 | /* Save the line count at the start of each transaction - single commands | |
2057 | like HELO and RSET count as whole transactions. */ | |
2058 | ||
2059 | bsmtp_transaction_linecount = receive_linecount; | |
2060 | ||
2061 | if ((receive_feof)()) return 0; /* Treat EOF as QUIT */ | |
2062 | ||
57cc2785 | 2063 | cancel_cutthrough_connection(TRUE, US"smtp_setup_batch_msg"); |
059ec3d9 PH |
2064 | smtp_reset(reset_point); /* Reset for start of message */ |
2065 | ||
2066 | /* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE | |
2067 | value. The values are 2 larger than the required yield of the function. */ | |
2068 | ||
2069 | while (done <= 0) | |
2070 | { | |
2071 | uschar *errmess; | |
2072 | uschar *recipient = NULL; | |
2073 | int start, end, sender_domain, recipient_domain; | |
2074 | ||
bd8fbe36 | 2075 | switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED)) |
059ec3d9 PH |
2076 | { |
2077 | /* The HELO/EHLO commands set sender_address_helo if they have | |
2078 | valid data; otherwise they are ignored, except that they do | |
2079 | a reset of the state. */ | |
2080 | ||
2081 | case HELO_CMD: | |
2082 | case EHLO_CMD: | |
2083 | ||
ca86f471 | 2084 | check_helo(smtp_cmd_data); |
059ec3d9 PH |
2085 | /* Fall through */ |
2086 | ||
2087 | case RSET_CMD: | |
57cc2785 | 2088 | cancel_cutthrough_connection(TRUE, US"RSET received"); |
059ec3d9 PH |
2089 | smtp_reset(reset_point); |
2090 | bsmtp_transaction_linecount = receive_linecount; | |
2091 | break; | |
2092 | ||
2093 | ||
2094 | /* The MAIL FROM command requires an address as an operand. All we | |
2095 | do here is to parse it for syntactic correctness. The form "<>" is | |
2096 | a special case which converts into an empty string. The start/end | |
2097 | pointers in the original are not used further for this address, as | |
2098 | it is the canonical extracted address which is all that is kept. */ | |
2099 | ||
2100 | case MAIL_CMD: | |
474f71bf | 2101 | smtp_mailcmd_count++; /* Count for no-mail log */ |
059ec3d9 PH |
2102 | if (sender_address != NULL) |
2103 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 2104 | moan_smtp_batch(smtp_cmd_buffer, "503 Sender already given"); |
059ec3d9 | 2105 | |
ca86f471 | 2106 | if (smtp_cmd_data[0] == 0) |
059ec3d9 | 2107 | /* The function moan_smtp_batch() does not return. */ |
3ee512ff | 2108 | moan_smtp_batch(smtp_cmd_buffer, "501 MAIL FROM must have an address operand"); |
059ec3d9 PH |
2109 | |
2110 | /* Reset to start of message */ | |
2111 | ||
57cc2785 | 2112 | cancel_cutthrough_connection(TRUE, US"MAIL received"); |
059ec3d9 PH |
2113 | smtp_reset(reset_point); |
2114 | ||
2115 | /* Apply SMTP rewrite */ | |
2116 | ||
2117 | raw_sender = ((rewrite_existflags & rewrite_smtp) != 0)? | |
ca86f471 PH |
2118 | rewrite_one(smtp_cmd_data, rewrite_smtp|rewrite_smtp_sender, NULL, FALSE, |
2119 | US"", global_rewrite_rules) : smtp_cmd_data; | |
059ec3d9 PH |
2120 | |
2121 | /* Extract the address; the TRUE flag allows <> as valid */ | |
2122 | ||
2123 | raw_sender = | |
2124 | parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain, | |
2125 | TRUE); | |
2126 | ||
2127 | if (raw_sender == NULL) | |
2128 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 2129 | moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess); |
059ec3d9 PH |
2130 | |
2131 | sender_address = string_copy(raw_sender); | |
2132 | ||
2133 | /* Qualify unqualified sender addresses if permitted to do so. */ | |
2134 | ||
2135 | if (sender_domain == 0 && sender_address[0] != 0 && sender_address[0] != '@') | |
2136 | { | |
2137 | if (allow_unqualified_sender) | |
2138 | { | |
2139 | sender_address = rewrite_address_qualify(sender_address, FALSE); | |
2140 | DEBUG(D_receive) debug_printf("unqualified address %s accepted " | |
2141 | "and rewritten\n", raw_sender); | |
2142 | } | |
2143 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 2144 | else moan_smtp_batch(smtp_cmd_buffer, "501 sender address must contain " |
059ec3d9 PH |
2145 | "a domain"); |
2146 | } | |
2147 | break; | |
2148 | ||
2149 | ||
2150 | /* The RCPT TO command requires an address as an operand. All we do | |
2151 | here is to parse it for syntactic correctness. There may be any number | |
2152 | of RCPT TO commands, specifying multiple senders. We build them all into | |
2153 | a data structure that is in argc/argv format. The start/end values | |
2154 | given by parse_extract_address are not used, as we keep only the | |
2155 | extracted address. */ | |
2156 | ||
2157 | case RCPT_CMD: | |
2158 | if (sender_address == NULL) | |
2159 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 2160 | moan_smtp_batch(smtp_cmd_buffer, "503 No sender yet given"); |
059ec3d9 | 2161 | |
ca86f471 | 2162 | if (smtp_cmd_data[0] == 0) |
059ec3d9 | 2163 | /* The function moan_smtp_batch() does not return. */ |
3ee512ff | 2164 | moan_smtp_batch(smtp_cmd_buffer, "501 RCPT TO must have an address operand"); |
059ec3d9 PH |
2165 | |
2166 | /* Check maximum number allowed */ | |
2167 | ||
2168 | if (recipients_max > 0 && recipients_count + 1 > recipients_max) | |
2169 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 2170 | moan_smtp_batch(smtp_cmd_buffer, "%s too many recipients", |
059ec3d9 PH |
2171 | recipients_max_reject? "552": "452"); |
2172 | ||
2173 | /* Apply SMTP rewrite, then extract address. Don't allow "<>" as a | |
2174 | recipient address */ | |
2175 | ||
2685d6e0 JH |
2176 | recipient = rewrite_existflags & rewrite_smtp |
2177 | ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"", | |
2178 | global_rewrite_rules) | |
2179 | : smtp_cmd_data; | |
059ec3d9 | 2180 | |
059ec3d9 PH |
2181 | recipient = parse_extract_address(recipient, &errmess, &start, &end, |
2182 | &recipient_domain, FALSE); | |
059ec3d9 | 2183 | |
2685d6e0 | 2184 | if (!recipient) |
059ec3d9 | 2185 | /* The function moan_smtp_batch() does not return. */ |
3ee512ff | 2186 | moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess); |
059ec3d9 PH |
2187 | |
2188 | /* If the recipient address is unqualified, qualify it if permitted. Then | |
2189 | add it to the list of recipients. */ | |
2190 | ||
2191 | if (recipient_domain == 0) | |
2192 | { | |
2193 | if (allow_unqualified_recipient) | |
2194 | { | |
2195 | DEBUG(D_receive) debug_printf("unqualified address %s accepted\n", | |
2196 | recipient); | |
2197 | recipient = rewrite_address_qualify(recipient, TRUE); | |
2198 | } | |
2199 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 2200 | else moan_smtp_batch(smtp_cmd_buffer, "501 recipient address must contain " |
059ec3d9 PH |
2201 | "a domain"); |
2202 | } | |
2203 | receive_add_recipient(recipient, -1); | |
2204 | break; | |
2205 | ||
2206 | ||
2207 | /* The DATA command is legal only if it follows successful MAIL FROM | |
2208 | and RCPT TO commands. This function is complete when a valid DATA | |
2209 | command is encountered. */ | |
2210 | ||
2211 | case DATA_CMD: | |
2212 | if (sender_address == NULL || recipients_count <= 0) | |
2213 | { | |
2214 | /* The function moan_smtp_batch() does not return. */ | |
2215 | if (sender_address == NULL) | |
3ee512ff | 2216 | moan_smtp_batch(smtp_cmd_buffer, |
059ec3d9 PH |
2217 | "503 MAIL FROM:<sender> command must precede DATA"); |
2218 | else | |
3ee512ff | 2219 | moan_smtp_batch(smtp_cmd_buffer, |
059ec3d9 PH |
2220 | "503 RCPT TO:<recipient> must precede DATA"); |
2221 | } | |
2222 | else | |
2223 | { | |
2224 | done = 3; /* DATA successfully achieved */ | |
2225 | message_ended = END_NOTENDED; /* Indicate in middle of message */ | |
2226 | } | |
2227 | break; | |
2228 | ||
2229 | ||
2230 | /* The VRFY, EXPN, HELP, ETRN, and NOOP commands are ignored. */ | |
2231 | ||
2232 | case VRFY_CMD: | |
2233 | case EXPN_CMD: | |
2234 | case HELP_CMD: | |
2235 | case NOOP_CMD: | |
2236 | case ETRN_CMD: | |
2237 | bsmtp_transaction_linecount = receive_linecount; | |
2238 | break; | |
2239 | ||
2240 | ||
2241 | case EOF_CMD: | |
2242 | case QUIT_CMD: | |
2243 | done = 2; | |
2244 | break; | |
2245 | ||
2246 | ||
2247 | case BADARG_CMD: | |
2248 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 2249 | moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected argument data"); |
059ec3d9 PH |
2250 | break; |
2251 | ||
2252 | ||
2253 | case BADCHAR_CMD: | |
2254 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 2255 | moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected NULL in SMTP command"); |
059ec3d9 PH |
2256 | break; |
2257 | ||
2258 | ||
2259 | default: | |
2260 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 2261 | moan_smtp_batch(smtp_cmd_buffer, "500 Command unrecognized"); |
059ec3d9 PH |
2262 | break; |
2263 | } | |
2264 | } | |
2265 | ||
2266 | return done - 2; /* Convert yield values */ | |
2267 | } | |
2268 | ||
2269 | ||
2270 | ||
2271 | ||
cf0c6164 JH |
2272 | static BOOL |
2273 | smtp_log_tls_fail(uschar * errstr) | |
2274 | { | |
2275 | uschar * conn_info = smtp_get_connection_info(); | |
2276 | ||
2277 | if (Ustrncmp(conn_info, US"SMTP ", 5) == 0) conn_info += 5; | |
2278 | /* I'd like to get separated H= here, but too hard for now */ | |
2279 | ||
2280 | log_write(0, LOG_MAIN, "TLS error on %s %s", conn_info, errstr); | |
2281 | return FALSE; | |
2282 | } | |
2283 | ||
2284 | ||
059ec3d9 PH |
2285 | /************************************************* |
2286 | * Start an SMTP session * | |
2287 | *************************************************/ | |
2288 | ||
2289 | /* This function is called at the start of an SMTP session. Thereafter, | |
2290 | smtp_setup_msg() is called to initiate each separate message. This | |
2291 | function does host-specific testing, and outputs the banner line. | |
2292 | ||
2293 | Arguments: none | |
2294 | Returns: FALSE if the session can not continue; something has | |
2295 | gone wrong, or the connection to the host is blocked | |
2296 | */ | |
2297 | ||
2298 | BOOL | |
2299 | smtp_start_session(void) | |
2300 | { | |
2301 | int size = 256; | |
4e88a19f PH |
2302 | int ptr, esclen; |
2303 | uschar *user_msg, *log_msg; | |
2304 | uschar *code, *esc; | |
059ec3d9 PH |
2305 | uschar *p, *s, *ss; |
2306 | ||
b4ed4da0 PH |
2307 | smtp_connection_start = time(NULL); |
2308 | for (smtp_ch_index = 0; smtp_ch_index < SMTP_HBUFF_SIZE; smtp_ch_index++) | |
2309 | smtp_connection_had[smtp_ch_index] = SCH_NONE; | |
2310 | smtp_ch_index = 0; | |
2311 | ||
00f00ca5 PH |
2312 | /* Default values for certain variables */ |
2313 | ||
059ec3d9 | 2314 | helo_seen = esmtp = helo_accept_junk = FALSE; |
b4ed4da0 | 2315 | smtp_mailcmd_count = 0; |
059ec3d9 PH |
2316 | count_nonmail = TRUE_UNSET; |
2317 | synprot_error_count = unknown_command_count = nonmail_command_count = 0; | |
2318 | smtp_delay_mail = smtp_rlm_base; | |
2319 | auth_advertised = FALSE; | |
2320 | pipelining_advertised = FALSE; | |
cf8b11a5 | 2321 | pipelining_enable = TRUE; |
059ec3d9 | 2322 | sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING; |
8f128379 | 2323 | smtp_exit_function_called = FALSE; /* For avoiding loop in not-quit exit */ |
059ec3d9 | 2324 | |
33d73e3b PH |
2325 | /* If receiving by -bs from a trusted user, or testing with -bh, we allow |
2326 | authentication settings from -oMaa to remain in force. */ | |
2327 | ||
2328 | if (!host_checking && !sender_host_notsocket) sender_host_authenticated = NULL; | |
059ec3d9 PH |
2329 | authenticated_by = NULL; |
2330 | ||
2331 | #ifdef SUPPORT_TLS | |
817d9f57 | 2332 | tls_in.cipher = tls_in.peerdn = NULL; |
9d1c15ef JH |
2333 | tls_in.ourcert = tls_in.peercert = NULL; |
2334 | tls_in.sni = NULL; | |
44662487 | 2335 | tls_in.ocsp = OCSP_NOT_REQ; |
059ec3d9 PH |
2336 | tls_advertised = FALSE; |
2337 | #endif | |
6c1c3d1d | 2338 | dsn_advertised = FALSE; |
8c5d388a | 2339 | #ifdef SUPPORT_I18N |
d1a13eea JH |
2340 | smtputf8_advertised = FALSE; |
2341 | #endif | |
059ec3d9 PH |
2342 | |
2343 | /* Reset ACL connection variables */ | |
2344 | ||
38a0a95f | 2345 | acl_var_c = NULL; |
059ec3d9 | 2346 | |
ca86f471 | 2347 | /* Allow for trailing 0 in the command and data buffers. */ |
3ee512ff | 2348 | |
bd8fbe36 | 2349 | if (!(smtp_cmd_buffer = US malloc(2*SMTP_CMD_BUFFER_SIZE + 2))) |
059ec3d9 PH |
2350 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
2351 | "malloc() failed for SMTP command buffer"); | |
40c90bca | 2352 | |
2416c261 | 2353 | smtp_cmd_buffer[0] = 0; |
bd8fbe36 | 2354 | smtp_data_buffer = smtp_cmd_buffer + SMTP_CMD_BUFFER_SIZE + 1; |
059ec3d9 PH |
2355 | |
2356 | /* For batched input, the protocol setting can be overridden from the | |
2357 | command line by a trusted caller. */ | |
2358 | ||
2359 | if (smtp_batched_input) | |
2360 | { | |
40c90bca | 2361 | if (!received_protocol) received_protocol = US"local-bsmtp"; |
059ec3d9 PH |
2362 | } |
2363 | ||
2364 | /* For non-batched SMTP input, the protocol setting is forced here. It will be | |
2365 | reset later if any of EHLO/AUTH/STARTTLS are received. */ | |
2366 | ||
2367 | else | |
2368 | received_protocol = | |
e524074d | 2369 | (sender_host_address ? protocols : protocols_local) [pnormal]; |
059ec3d9 PH |
2370 | |
2371 | /* Set up the buffer for inputting using direct read() calls, and arrange to | |
2372 | call the local functions instead of the standard C ones. */ | |
2373 | ||
bd8fbe36 | 2374 | if (!(smtp_inbuffer = (uschar *)malloc(IN_BUFFER_SIZE))) |
059ec3d9 | 2375 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "malloc() failed for SMTP input buffer"); |
40c90bca | 2376 | |
059ec3d9 | 2377 | receive_getc = smtp_getc; |
0d81dabc | 2378 | receive_getbuf = smtp_getbuf; |
584e96c6 | 2379 | receive_get_cache = smtp_get_cache; |
059ec3d9 PH |
2380 | receive_ungetc = smtp_ungetc; |
2381 | receive_feof = smtp_feof; | |
2382 | receive_ferror = smtp_ferror; | |
58eb016e | 2383 | receive_smtp_buffered = smtp_buffered; |
059ec3d9 PH |
2384 | smtp_inptr = smtp_inend = smtp_inbuffer; |
2385 | smtp_had_eof = smtp_had_error = 0; | |
2386 | ||
2387 | /* Set up the message size limit; this may be host-specific */ | |
2388 | ||
d45b1de8 PH |
2389 | thismessage_size_limit = expand_string_integer(message_size_limit, TRUE); |
2390 | if (expand_string_message != NULL) | |
059ec3d9 PH |
2391 | { |
2392 | if (thismessage_size_limit == -1) | |
2393 | log_write(0, LOG_MAIN|LOG_PANIC, "unable to expand message_size_limit: " | |
2394 | "%s", expand_string_message); | |
2395 | else | |
2396 | log_write(0, LOG_MAIN|LOG_PANIC, "invalid message_size_limit: " | |
2397 | "%s", expand_string_message); | |
2398 | smtp_closedown(US"Temporary local problem - please try later"); | |
2399 | return FALSE; | |
2400 | } | |
2401 | ||
2402 | /* When a message is input locally via the -bs or -bS options, sender_host_ | |
2403 | unknown is set unless -oMa was used to force an IP address, in which case it | |
2404 | is checked like a real remote connection. When -bs is used from inetd, this | |
2405 | flag is not set, causing the sending host to be checked. The code that deals | |
2406 | with IP source routing (if configured) is never required for -bs or -bS and | |
2407 | the flag sender_host_notsocket is used to suppress it. | |
2408 | ||
2409 | If smtp_accept_max and smtp_accept_reserve are set, keep some connections in | |
2410 | reserve for certain hosts and/or networks. */ | |
2411 | ||
2412 | if (!sender_host_unknown) | |
2413 | { | |
2414 | int rc; | |
2415 | BOOL reserved_host = FALSE; | |
2416 | ||
2417 | /* Look up IP options (source routing info) on the socket if this is not an | |
2418 | -oMa "host", and if any are found, log them and drop the connection. | |
2419 | ||
2420 | Linux (and others now, see below) is different to everyone else, so there | |
2421 | has to be some conditional compilation here. Versions of Linux before 2.1.15 | |
2422 | used a structure whose name was "options". Somebody finally realized that | |
2423 | this name was silly, and it got changed to "ip_options". I use the | |
2424 | newer name here, but there is a fudge in the script that sets up os.h | |
2425 | to define a macro in older Linux systems. | |
2426 | ||
2427 | Sigh. Linux is a fast-moving target. Another generation of Linux uses | |
2428 | glibc 2, which has chosen ip_opts for the structure name. This is now | |
2429 | really a glibc thing rather than a Linux thing, so the condition name | |
2430 | has been changed to reflect this. It is relevant also to GNU/Hurd. | |
2431 | ||
2432 | Mac OS 10.x (Darwin) is like the later glibc versions, but without the | |
2433 | setting of the __GLIBC__ macro, so we can't detect it automatically. There's | |
2434 | a special macro defined in the os.h file. | |
2435 | ||
2436 | Some DGUX versions on older hardware appear not to support IP options at | |
2437 | all, so there is now a general macro which can be set to cut out this | |
2438 | support altogether. | |
2439 | ||
2440 | How to do this properly in IPv6 is not yet known. */ | |
2441 | ||
2442 | #if !HAVE_IPV6 && !defined(NO_IP_OPTIONS) | |
2443 | ||
2444 | #ifdef GLIBC_IP_OPTIONS | |
2445 | #if (!defined __GLIBC__) || (__GLIBC__ < 2) | |
2446 | #define OPTSTYLE 1 | |
2447 | #else | |
2448 | #define OPTSTYLE 2 | |
2449 | #endif | |
2450 | #elif defined DARWIN_IP_OPTIONS | |
2451 | #define OPTSTYLE 2 | |
2452 | #else | |
2453 | #define OPTSTYLE 3 | |
2454 | #endif | |
2455 | ||
2456 | if (!host_checking && !sender_host_notsocket) | |
2457 | { | |
2458 | #if OPTSTYLE == 1 | |
36a3b041 | 2459 | EXIM_SOCKLEN_T optlen = sizeof(struct ip_options) + MAX_IPOPTLEN; |
059ec3d9 PH |
2460 | struct ip_options *ipopt = store_get(optlen); |
2461 | #elif OPTSTYLE == 2 | |
2462 | struct ip_opts ipoptblock; | |
2463 | struct ip_opts *ipopt = &ipoptblock; | |
36a3b041 | 2464 | EXIM_SOCKLEN_T optlen = sizeof(ipoptblock); |
059ec3d9 PH |
2465 | #else |
2466 | struct ipoption ipoptblock; | |
2467 | struct ipoption *ipopt = &ipoptblock; | |
36a3b041 | 2468 | EXIM_SOCKLEN_T optlen = sizeof(ipoptblock); |
059ec3d9 PH |
2469 | #endif |
2470 | ||
2471 | /* Occasional genuine failures of getsockopt() have been seen - for | |
2472 | example, "reset by peer". Therefore, just log and give up on this | |
2473 | call, unless the error is ENOPROTOOPT. This error is given by systems | |
2474 | that have the interfaces but not the mechanism - e.g. GNU/Hurd at the time | |
2475 | of writing. So for that error, carry on - we just can't do an IP options | |
2476 | check. */ | |
2477 | ||
2478 | DEBUG(D_receive) debug_printf("checking for IP options\n"); | |
2479 | ||
2480 | if (getsockopt(fileno(smtp_out), IPPROTO_IP, IP_OPTIONS, (uschar *)(ipopt), | |
2481 | &optlen) < 0) | |
2482 | { | |
2483 | if (errno != ENOPROTOOPT) | |
2484 | { | |
2485 | log_write(0, LOG_MAIN, "getsockopt() failed from %s: %s", | |
2486 | host_and_ident(FALSE), strerror(errno)); | |
2487 | smtp_printf("451 SMTP service not available\r\n"); | |
2488 | return FALSE; | |
2489 | } | |
2490 | } | |
2491 | ||
2492 | /* Deal with any IP options that are set. On the systems I have looked at, | |
2493 | the value of MAX_IPOPTLEN has been 40, meaning that there should never be | |
2494 | more logging data than will fit in big_buffer. Nevertheless, after somebody | |
2495 | questioned this code, I've added in some paranoid checking. */ | |
2496 | ||
2497 | else if (optlen > 0) | |
2498 | { | |
2499 | uschar *p = big_buffer; | |
2500 | uschar *pend = big_buffer + big_buffer_size; | |
2501 | uschar *opt, *adptr; | |
2502 | int optcount; | |
2503 | struct in_addr addr; | |
2504 | ||
2505 | #if OPTSTYLE == 1 | |
2506 | uschar *optstart = (uschar *)(ipopt->__data); | |
2507 | #elif OPTSTYLE == 2 | |
2508 | uschar *optstart = (uschar *)(ipopt->ip_opts); | |
2509 | #else | |
2510 | uschar *optstart = (uschar *)(ipopt->ipopt_list); | |
2511 | #endif | |
2512 | ||
2513 | DEBUG(D_receive) debug_printf("IP options exist\n"); | |
2514 | ||
2515 | Ustrcpy(p, "IP options on incoming call:"); | |
2516 | p += Ustrlen(p); | |
2517 | ||
2518 | for (opt = optstart; opt != NULL && | |
2519 | opt < (uschar *)(ipopt) + optlen;) | |
2520 | { | |
2521 | switch (*opt) | |
2522 | { | |
2523 | case IPOPT_EOL: | |
2524 | opt = NULL; | |
2525 | break; | |
2526 | ||
2527 | case IPOPT_NOP: | |
2528 | opt++; | |
2529 | break; | |
2530 | ||
2531 | case IPOPT_SSRR: | |
2532 | case IPOPT_LSRR: | |
2533 | if (!string_format(p, pend-p, " %s [@%s", | |
2534 | (*opt == IPOPT_SSRR)? "SSRR" : "LSRR", | |
2535 | #if OPTSTYLE == 1 | |
2536 | inet_ntoa(*((struct in_addr *)(&(ipopt->faddr)))))) | |
2537 | #elif OPTSTYLE == 2 | |
2538 | inet_ntoa(ipopt->ip_dst))) | |
2539 | #else | |
2540 | inet_ntoa(ipopt->ipopt_dst))) | |
2541 | #endif | |
2542 | { | |
2543 | opt = NULL; | |
2544 | break; | |
2545 | } | |
2546 | ||
2547 | p += Ustrlen(p); | |
2548 | optcount = (opt[1] - 3) / sizeof(struct in_addr); | |
2549 | adptr = opt + 3; | |
2550 | while (optcount-- > 0) | |
2551 | { | |
2552 | memcpy(&addr, adptr, sizeof(addr)); | |
2553 | if (!string_format(p, pend - p - 1, "%s%s", | |
2554 | (optcount == 0)? ":" : "@", inet_ntoa(addr))) | |
2555 | { | |
2556 | opt = NULL; | |
2557 | break; | |
2558 | } | |
2559 | p += Ustrlen(p); | |
2560 | adptr += sizeof(struct in_addr); | |
2561 | } | |
2562 | *p++ = ']'; | |
2563 | opt += opt[1]; | |
2564 | break; | |
2565 | ||
2566 | default: | |
2567 | { | |
2568 | int i; | |
2569 | if (pend - p < 4 + 3*opt[1]) { opt = NULL; break; } | |
2570 | Ustrcat(p, "[ "); | |
2571 | p += 2; | |
2572 | for (i = 0; i < opt[1]; i++) | |
2573 | { | |
2574 | sprintf(CS p, "%2.2x ", opt[i]); | |
2575 | p += 3; | |
2576 | } | |
2577 | *p++ = ']'; | |
2578 | } | |
2579 | opt += opt[1]; | |
2580 | break; | |
2581 | } | |
2582 | } | |
2583 | ||
2584 | *p = 0; | |
2585 | log_write(0, LOG_MAIN, "%s", big_buffer); | |
2586 | ||
2587 | /* Refuse any call with IP options. This is what tcpwrappers 7.5 does. */ | |
2588 | ||
2589 | log_write(0, LOG_MAIN|LOG_REJECT, | |
2590 | "connection from %s refused (IP options)", host_and_ident(FALSE)); | |
2591 | ||
2592 | smtp_printf("554 SMTP service not available\r\n"); | |
2593 | return FALSE; | |
2594 | } | |
2595 | ||
2596 | /* Length of options = 0 => there are no options */ | |
2597 | ||
2598 | else DEBUG(D_receive) debug_printf("no IP options found\n"); | |
2599 | } | |
2600 | #endif /* HAVE_IPV6 && !defined(NO_IP_OPTIONS) */ | |
2601 | ||
2602 | /* Set keep-alive in socket options. The option is on by default. This | |
2603 | setting is an attempt to get rid of some hanging connections that stick in | |
2604 | read() when the remote end (usually a dialup) goes away. */ | |
2605 | ||
2606 | if (smtp_accept_keepalive && !sender_host_notsocket) | |
2607 | ip_keepalive(fileno(smtp_out), sender_host_address, FALSE); | |
2608 | ||
2609 | /* If the current host matches host_lookup, set the name by doing a | |
2610 | reverse lookup. On failure, sender_host_name will be NULL and | |
2611 | host_lookup_failed will be TRUE. This may or may not be serious - optional | |
2612 | checks later. */ | |
2613 | ||
2614 | if (verify_check_host(&host_lookup) == OK) | |
2615 | { | |
2616 | (void)host_name_lookup(); | |
2617 | host_build_sender_fullhost(); | |
2618 | } | |
2619 | ||
2620 | /* Delay this until we have the full name, if it is looked up. */ | |
2621 | ||
2622 | set_process_info("handling incoming connection from %s", | |
2623 | host_and_ident(FALSE)); | |
2624 | ||
1ad6489e JH |
2625 | /* Expand smtp_receive_timeout, if needed */ |
2626 | ||
2627 | if (smtp_receive_timeout_s) | |
2628 | { | |
2629 | uschar * exp; | |
2630 | if ( !(exp = expand_string(smtp_receive_timeout_s)) | |
2631 | || !(*exp) | |
2632 | || (smtp_receive_timeout = readconf_readtime(exp, 0, FALSE)) < 0 | |
2633 | ) | |
2634 | log_write(0, LOG_MAIN|LOG_PANIC, | |
2635 | "bad value for smtp_receive_timeout: '%s'", exp ? exp : US""); | |
2636 | } | |
2637 | ||
059ec3d9 PH |
2638 | /* Test for explicit connection rejection */ |
2639 | ||
2640 | if (verify_check_host(&host_reject_connection) == OK) | |
2641 | { | |
2642 | log_write(L_connection_reject, LOG_MAIN|LOG_REJECT, "refused connection " | |
2643 | "from %s (host_reject_connection)", host_and_ident(FALSE)); | |
2644 | smtp_printf("554 SMTP service not available\r\n"); | |
2645 | return FALSE; | |
2646 | } | |
2647 | ||
afb3eaaf PH |
2648 | /* Test with TCP Wrappers if so configured. There is a problem in that |
2649 | hosts_ctl() returns 0 (deny) under a number of system failure circumstances, | |
2650 | such as disks dying. In these cases, it is desirable to reject with a 4xx | |
2651 | error instead of a 5xx error. There isn't a "right" way to detect such | |
2652 | problems. The following kludge is used: errno is zeroed before calling | |
2653 | hosts_ctl(). If the result is "reject", a 5xx error is given only if the | |
2654 | value of errno is 0 or ENOENT (which happens if /etc/hosts.{allow,deny} does | |
2655 | not exist). */ | |
059ec3d9 | 2656 | |
1811cb4c | 2657 | #ifdef USE_TCP_WRAPPERS |
afb3eaaf | 2658 | errno = 0; |
1811cb4c | 2659 | if (!(tcp_wrappers_name = expand_string(tcp_wrappers_daemon_name))) |
5dc43717 JJ |
2660 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" " |
2661 | "(tcp_wrappers_name) failed: %s", string_printing(tcp_wrappers_name), | |
2662 | expand_string_message); | |
1811cb4c | 2663 | |
5dc43717 | 2664 | if (!hosts_ctl(tcp_wrappers_name, |
1811cb4c JH |
2665 | sender_host_name ? CS sender_host_name : STRING_UNKNOWN, |
2666 | sender_host_address ? CS sender_host_address : STRING_UNKNOWN, | |
2667 | sender_ident ? CS sender_ident : STRING_UNKNOWN)) | |
059ec3d9 | 2668 | { |
afb3eaaf PH |
2669 | if (errno == 0 || errno == ENOENT) |
2670 | { | |
2671 | HDEBUG(D_receive) debug_printf("tcp wrappers rejection\n"); | |
2672 | log_write(L_connection_reject, | |
2673 | LOG_MAIN|LOG_REJECT, "refused connection from %s " | |
2674 | "(tcp wrappers)", host_and_ident(FALSE)); | |
2675 | smtp_printf("554 SMTP service not available\r\n"); | |
2676 | } | |
2677 | else | |
2678 | { | |
2679 | int save_errno = errno; | |
2680 | HDEBUG(D_receive) debug_printf("tcp wrappers rejected with unexpected " | |
2681 | "errno value %d\n", save_errno); | |
2682 | log_write(L_connection_reject, | |
2683 | LOG_MAIN|LOG_REJECT, "temporarily refused connection from %s " | |
2684 | "(tcp wrappers errno=%d)", host_and_ident(FALSE), save_errno); | |
2685 | smtp_printf("451 Temporary local problem - please try later\r\n"); | |
2686 | } | |
059ec3d9 PH |
2687 | return FALSE; |
2688 | } | |
1811cb4c | 2689 | #endif |
059ec3d9 | 2690 | |
b01dd148 PH |
2691 | /* Check for reserved slots. The value of smtp_accept_count has already been |
2692 | incremented to include this process. */ | |
059ec3d9 PH |
2693 | |
2694 | if (smtp_accept_max > 0 && | |
b01dd148 | 2695 | smtp_accept_count > smtp_accept_max - smtp_accept_reserve) |
059ec3d9 PH |
2696 | { |
2697 | if ((rc = verify_check_host(&smtp_reserve_hosts)) != OK) | |
2698 | { | |
2699 | log_write(L_connection_reject, | |
2700 | LOG_MAIN, "temporarily refused connection from %s: not in " | |
2701 | "reserve list: connected=%d max=%d reserve=%d%s", | |
b01dd148 | 2702 | host_and_ident(FALSE), smtp_accept_count - 1, smtp_accept_max, |
059ec3d9 PH |
2703 | smtp_accept_reserve, (rc == DEFER)? " (lookup deferred)" : ""); |
2704 | smtp_printf("421 %s: Too many concurrent SMTP connections; " | |
2705 | "please try again later\r\n", smtp_active_hostname); | |
2706 | return FALSE; | |
2707 | } | |
2708 | reserved_host = TRUE; | |
2709 | } | |
2710 | ||
2711 | /* If a load level above which only messages from reserved hosts are | |
2712 | accepted is set, check the load. For incoming calls via the daemon, the | |
2713 | check is done in the superior process if there are no reserved hosts, to | |
2714 | save a fork. In all cases, the load average will already be available | |
2715 | in a global variable at this point. */ | |
2716 | ||
2717 | if (smtp_load_reserve >= 0 && | |
2718 | load_average > smtp_load_reserve && | |
2719 | !reserved_host && | |
2720 | verify_check_host(&smtp_reserve_hosts) != OK) | |
2721 | { | |
2722 | log_write(L_connection_reject, | |
2723 | LOG_MAIN, "temporarily refused connection from %s: not in " | |
2724 | "reserve list and load average = %.2f", host_and_ident(FALSE), | |
2725 | (double)load_average/1000.0); | |
2726 | smtp_printf("421 %s: Too much load; please try again later\r\n", | |
2727 | smtp_active_hostname); | |
2728 | return FALSE; | |
2729 | } | |
2730 | ||
2731 | /* Determine whether unqualified senders or recipients are permitted | |
2732 | for this host. Unfortunately, we have to do this every time, in order to | |
2733 | set the flags so that they can be inspected when considering qualifying | |
2734 | addresses in the headers. For a site that permits no qualification, this | |
2735 | won't take long, however. */ | |
2736 | ||
2737 | allow_unqualified_sender = | |
2738 | verify_check_host(&sender_unqualified_hosts) == OK; | |
2739 | ||
2740 | allow_unqualified_recipient = | |
2741 | verify_check_host(&recipient_unqualified_hosts) == OK; | |
2742 | ||
2743 | /* Determine whether HELO/EHLO is required for this host. The requirement | |
2744 | can be hard or soft. */ | |
2745 | ||
2746 | helo_required = verify_check_host(&helo_verify_hosts) == OK; | |
2747 | if (!helo_required) | |
2748 | helo_verify = verify_check_host(&helo_try_verify_hosts) == OK; | |
2749 | ||
2750 | /* Determine whether this hosts is permitted to send syntactic junk | |
2751 | after a HELO or EHLO command. */ | |
2752 | ||
2753 | helo_accept_junk = verify_check_host(&helo_accept_junk_hosts) == OK; | |
2754 | } | |
2755 | ||
2756 | /* For batch SMTP input we are now done. */ | |
2757 | ||
2758 | if (smtp_batched_input) return TRUE; | |
2759 | ||
a3c86431 TL |
2760 | /* If valid Proxy Protocol source is connecting, set up session. |
2761 | * Failure will not allow any SMTP function other than QUIT. */ | |
1811cb4c JH |
2762 | |
2763 | #ifdef SUPPORT_PROXY | |
a3c86431 TL |
2764 | proxy_session = FALSE; |
2765 | proxy_session_failed = FALSE; | |
2766 | if (check_proxy_protocol_host()) | |
1811cb4c JH |
2767 | setup_proxy_protocol_host(); |
2768 | #endif | |
2769 | ||
2770 | /* Start up TLS if tls_on_connect is set. This is for supporting the legacy | |
2771 | smtps port for use with older style SSL MTAs. */ | |
2772 | ||
2773 | #ifdef SUPPORT_TLS | |
cf0c6164 JH |
2774 | if (tls_in.on_connect && tls_server_start(tls_require_ciphers, &user_msg) != OK) |
2775 | return smtp_log_tls_fail(user_msg); | |
a3c86431 TL |
2776 | #endif |
2777 | ||
1811cb4c | 2778 | /* Run the connect ACL if it exists */ |
059ec3d9 | 2779 | |
4e88a19f | 2780 | user_msg = NULL; |
3cc3f762 | 2781 | if (acl_smtp_connect) |
059ec3d9 PH |
2782 | { |
2783 | int rc; | |
3cc3f762 JH |
2784 | if ((rc = acl_check(ACL_WHERE_CONNECT, NULL, acl_smtp_connect, &user_msg, |
2785 | &log_msg)) != OK) | |
059ec3d9 | 2786 | { |
3cc3f762 | 2787 | (void) smtp_handle_acl_fail(ACL_WHERE_CONNECT, rc, user_msg, log_msg); |
059ec3d9 PH |
2788 | return FALSE; |
2789 | } | |
2790 | } | |
2791 | ||
2792 | /* Output the initial message for a two-way SMTP connection. It may contain | |
2793 | newlines, which then cause a multi-line response to be given. */ | |
2794 | ||
4e88a19f PH |
2795 | code = US"220"; /* Default status code */ |
2796 | esc = US""; /* Default extended status code */ | |
2797 | esclen = 0; /* Length of esc */ | |
2798 | ||
d4ff61d1 | 2799 | if (!user_msg) |
4e88a19f | 2800 | { |
d4ff61d1 | 2801 | if (!(s = expand_string(smtp_banner))) |
4e88a19f PH |
2802 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" (smtp_banner) " |
2803 | "failed: %s", smtp_banner, expand_string_message); | |
2804 | } | |
2805 | else | |
2806 | { | |
2807 | int codelen = 3; | |
2808 | s = user_msg; | |
4f6ae5c3 | 2809 | smtp_message_code(&code, &codelen, &s, NULL, TRUE); |
d6a96edc | 2810 | if (codelen > 4) |
4e88a19f PH |
2811 | { |
2812 | esc = code + 4; | |
2813 | esclen = codelen - 4; | |
2814 | } | |
2815 | } | |
059ec3d9 PH |
2816 | |
2817 | /* Remove any terminating newlines; might as well remove trailing space too */ | |
2818 | ||
2819 | p = s + Ustrlen(s); | |
2820 | while (p > s && isspace(p[-1])) p--; | |
2821 | *p = 0; | |
2822 | ||
2823 | /* It seems that CC:Mail is braindead, and assumes that the greeting message | |
2824 | is all contained in a single IP packet. The original code wrote out the | |
2825 | greeting using several calls to fprint/fputc, and on busy servers this could | |
2826 | cause it to be split over more than one packet - which caused CC:Mail to fall | |
2827 | over when it got the second part of the greeting after sending its first | |
2828 | command. Sigh. To try to avoid this, build the complete greeting message | |
2829 | first, and output it in one fell swoop. This gives a better chance of it | |
2830 | ending up as a single packet. */ | |
2831 | ||
2832 | ss = store_get(size); | |
2833 | ptr = 0; | |
2834 | ||
2835 | p = s; | |
2836 | do /* At least once, in case we have an empty string */ | |
2837 | { | |
2838 | int len; | |
2839 | uschar *linebreak = Ustrchr(p, '\n'); | |
c2f669a4 | 2840 | ss = string_catn(ss, &size, &ptr, code, 3); |
059ec3d9 PH |
2841 | if (linebreak == NULL) |
2842 | { | |
2843 | len = Ustrlen(p); | |
c2f669a4 | 2844 | ss = string_catn(ss, &size, &ptr, US" ", 1); |
059ec3d9 PH |
2845 | } |
2846 | else | |
2847 | { | |
2848 | len = linebreak - p; | |
c2f669a4 | 2849 | ss = string_catn(ss, &size, &ptr, US"-", 1); |
059ec3d9 | 2850 | } |
c2f669a4 JH |
2851 | ss = string_catn(ss, &size, &ptr, esc, esclen); |
2852 | ss = string_catn(ss, &size, &ptr, p, len); | |
2853 | ss = string_catn(ss, &size, &ptr, US"\r\n", 2); | |
059ec3d9 PH |
2854 | p += len; |
2855 | if (linebreak != NULL) p++; | |
2856 | } | |
2857 | while (*p != 0); | |
2858 | ||
2859 | ss[ptr] = 0; /* string_cat leaves room for this */ | |
2860 | ||
2861 | /* Before we write the banner, check that there is no input pending, unless | |
2862 | this synchronisation check is disabled. */ | |
2863 | ||
a14e5636 | 2864 | if (!check_sync()) |
059ec3d9 | 2865 | { |
a14e5636 PH |
2866 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol " |
2867 | "synchronization error (input sent without waiting for greeting): " | |
2868 | "rejected connection from %s input=\"%s\"", host_and_ident(TRUE), | |
2869 | string_printing(smtp_inptr)); | |
2870 | smtp_printf("554 SMTP synchronization error\r\n"); | |
2871 | return FALSE; | |
059ec3d9 PH |
2872 | } |
2873 | ||
2874 | /* Now output the banner */ | |
2875 | ||
2876 | smtp_printf("%s", ss); | |
2877 | return TRUE; | |
2878 | } | |
2879 | ||
2880 | ||
2881 | ||
2882 | ||
2883 | ||
2884 | /************************************************* | |
2885 | * Handle SMTP syntax and protocol errors * | |
2886 | *************************************************/ | |
2887 | ||
2888 | /* Write to the log for SMTP syntax errors in incoming commands, if configured | |
2889 | to do so. Then transmit the error response. The return value depends on the | |
2890 | number of syntax and protocol errors in this SMTP session. | |
2891 | ||
2892 | Arguments: | |
2893 | type error type, given as a log flag bit | |
2894 | code response code; <= 0 means don't send a response | |
2895 | data data to reflect in the response (can be NULL) | |
2896 | errmess the error message | |
2897 | ||
2898 | Returns: -1 limit of syntax/protocol errors NOT exceeded | |
2899 | +1 limit of syntax/protocol errors IS exceeded | |
2900 | ||
2901 | These values fit in with the values of the "done" variable in the main | |
2902 | processing loop in smtp_setup_msg(). */ | |
2903 | ||
2904 | static int | |
2905 | synprot_error(int type, int code, uschar *data, uschar *errmess) | |
2906 | { | |
2907 | int yield = -1; | |
2908 | ||
2909 | log_write(type, LOG_MAIN, "SMTP %s error in \"%s\" %s %s", | |
2910 | (type == L_smtp_syntax_error)? "syntax" : "protocol", | |
3ee512ff | 2911 | string_printing(smtp_cmd_buffer), host_and_ident(TRUE), errmess); |
059ec3d9 PH |
2912 | |
2913 | if (++synprot_error_count > smtp_max_synprot_errors) | |
2914 | { | |
2915 | yield = 1; | |
2916 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
2917 | "syntax or protocol errors (last command was \"%s\")", | |
0ebc4d69 | 2918 | host_and_ident(FALSE), string_printing(smtp_cmd_buffer)); |
059ec3d9 PH |
2919 | } |
2920 | ||
2921 | if (code > 0) | |
2922 | { | |
2923 | smtp_printf("%d%c%s%s%s\r\n", code, (yield == 1)? '-' : ' ', | |
2924 | (data == NULL)? US"" : data, (data == NULL)? US"" : US": ", errmess); | |
2925 | if (yield == 1) | |
2926 | smtp_printf("%d Too many syntax or protocol errors\r\n", code); | |
2927 | } | |
2928 | ||
2929 | return yield; | |
2930 | } | |
2931 | ||
2932 | ||
2933 | ||
2934 | ||
059ec3d9 PH |
2935 | /************************************************* |
2936 | * Send SMTP response, possibly multiline * | |
2937 | *************************************************/ | |
2938 | ||
2939 | /* There are, it seems, broken clients out there that cannot handle multiline | |
2940 | responses. If no_multiline_responses is TRUE (it can be set from an ACL), we | |
2941 | output nothing for non-final calls, and only the first line for anything else. | |
2942 | ||
2943 | Arguments: | |
a5bd321b | 2944 | code SMTP code, may involve extended status codes |
d6a96edc | 2945 | codelen length of smtp code; if > 4 there's an ESC |
059ec3d9 PH |
2946 | final FALSE if the last line isn't the final line |
2947 | msg message text, possibly containing newlines | |
2948 | ||
2949 | Returns: nothing | |
2950 | */ | |
2951 | ||
2952 | void | |
a5bd321b | 2953 | smtp_respond(uschar* code, int codelen, BOOL final, uschar *msg) |
059ec3d9 | 2954 | { |
a5bd321b PH |
2955 | int esclen = 0; |
2956 | uschar *esc = US""; | |
2957 | ||
059ec3d9 PH |
2958 | if (!final && no_multiline_responses) return; |
2959 | ||
d6a96edc | 2960 | if (codelen > 4) |
a5bd321b PH |
2961 | { |
2962 | esc = code + 4; | |
2963 | esclen = codelen - 4; | |
2964 | } | |
2965 | ||
2679d413 PH |
2966 | /* If this is the first output for a (non-batch) RCPT command, see if all RCPTs |
2967 | have had the same. Note: this code is also present in smtp_printf(). It would | |
2968 | be tidier to have it only in one place, but when it was added, it was easier to | |
2969 | do it that way, so as not to have to mess with the code for the RCPT command, | |
2970 | which sometimes uses smtp_printf() and sometimes smtp_respond(). */ | |
2971 | ||
2972 | if (rcpt_in_progress) | |
2973 | { | |
2974 | if (rcpt_smtp_response == NULL) | |
2975 | rcpt_smtp_response = string_copy(msg); | |
2976 | else if (rcpt_smtp_response_same && | |
2977 | Ustrcmp(rcpt_smtp_response, msg) != 0) | |
2978 | rcpt_smtp_response_same = FALSE; | |
2979 | rcpt_in_progress = FALSE; | |
2980 | } | |
2981 | ||
2982 | /* Not output the message, splitting it up into multiple lines if necessary. */ | |
2983 | ||
059ec3d9 PH |
2984 | for (;;) |
2985 | { | |
2986 | uschar *nl = Ustrchr(msg, '\n'); | |
2987 | if (nl == NULL) | |
2988 | { | |
a5bd321b | 2989 | smtp_printf("%.3s%c%.*s%s\r\n", code, final? ' ':'-', esclen, esc, msg); |
059ec3d9 PH |
2990 | return; |
2991 | } | |
2992 | else if (nl[1] == 0 || no_multiline_responses) | |
2993 | { | |
a5bd321b PH |
2994 | smtp_printf("%.3s%c%.*s%.*s\r\n", code, final? ' ':'-', esclen, esc, |
2995 | (int)(nl - msg), msg); | |
059ec3d9 PH |
2996 | return; |
2997 | } | |
2998 | else | |
2999 | { | |
a5bd321b | 3000 | smtp_printf("%.3s-%.*s%.*s\r\n", code, esclen, esc, (int)(nl - msg), msg); |
059ec3d9 PH |
3001 | msg = nl + 1; |
3002 | while (isspace(*msg)) msg++; | |
3003 | } | |
3004 | } | |
3005 | } | |
3006 | ||
3007 | ||
3008 | ||
3009 | ||
4e88a19f PH |
3010 | /************************************************* |
3011 | * Parse user SMTP message * | |
3012 | *************************************************/ | |
3013 | ||
3014 | /* This function allows for user messages overriding the response code details | |
3015 | by providing a suitable response code string at the start of the message | |
3016 | user_msg. Check the message for starting with a response code and optionally an | |
3017 | extended status code. If found, check that the first digit is valid, and if so, | |
3018 | change the code pointer and length to use the replacement. An invalid code | |
3019 | causes a panic log; in this case, if the log messages is the same as the user | |
3020 | message, we must also adjust the value of the log message to show the code that | |
3021 | is actually going to be used (the original one). | |
3022 | ||
3023 | This function is global because it is called from receive.c as well as within | |
3024 | this module. | |
3025 | ||
d6a96edc PH |
3026 | Note that the code length returned includes the terminating whitespace |
3027 | character, which is always included in the regex match. | |
3028 | ||
4e88a19f PH |
3029 | Arguments: |
3030 | code SMTP code, may involve extended status codes | |
d6a96edc | 3031 | codelen length of smtp code; if > 4 there's an ESC |
4e88a19f PH |
3032 | msg message text |
3033 | log_msg optional log message, to be adjusted with the new SMTP code | |
4f6ae5c3 | 3034 | check_valid if true, verify the response code |
4e88a19f PH |
3035 | |
3036 | Returns: nothing | |
3037 | */ | |
3038 | ||
3039 | void | |
4f6ae5c3 JH |
3040 | smtp_message_code(uschar **code, int *codelen, uschar **msg, uschar **log_msg, |
3041 | BOOL check_valid) | |
4e88a19f PH |
3042 | { |
3043 | int n; | |
3044 | int ovector[3]; | |
3045 | ||
4f6ae5c3 | 3046 | if (!msg || !*msg) return; |
4e88a19f | 3047 | |
4f6ae5c3 JH |
3048 | if ((n = pcre_exec(regex_smtp_code, NULL, CS *msg, Ustrlen(*msg), 0, |
3049 | PCRE_EOPT, ovector, sizeof(ovector)/sizeof(int))) < 0) return; | |
4e88a19f | 3050 | |
4f6ae5c3 | 3051 | if (check_valid && (*msg)[0] != (*code)[0]) |
4e88a19f PH |
3052 | { |
3053 | log_write(0, LOG_MAIN|LOG_PANIC, "configured error code starts with " | |
3054 | "incorrect digit (expected %c) in \"%s\"", (*code)[0], *msg); | |
3055 | if (log_msg != NULL && *log_msg == *msg) | |
3056 | *log_msg = string_sprintf("%s %s", *code, *log_msg + ovector[1]); | |
3057 | } | |
3058 | else | |
3059 | { | |
3060 | *code = *msg; | |
3061 | *codelen = ovector[1]; /* Includes final space */ | |
3062 | } | |
3063 | *msg += ovector[1]; /* Chop the code off the message */ | |
3064 | return; | |
3065 | } | |
3066 | ||
3067 | ||
3068 | ||
3069 | ||
059ec3d9 PH |
3070 | /************************************************* |
3071 | * Handle an ACL failure * | |
3072 | *************************************************/ | |
3073 | ||
3074 | /* This function is called when acl_check() fails. As well as calls from within | |
3075 | this module, it is called from receive.c for an ACL after DATA. It sorts out | |
3076 | logging the incident, and sets up the error response. A message containing | |
3077 | newlines is turned into a multiline SMTP response, but for logging, only the | |
3078 | first line is used. | |
3079 | ||
a5bd321b PH |
3080 | There's a table of default permanent failure response codes to use in |
3081 | globals.c, along with the table of names. VFRY is special. Despite RFC1123 it | |
3082 | defaults disabled in Exim. However, discussion in connection with RFC 821bis | |
3083 | (aka RFC 2821) has concluded that the response should be 252 in the disabled | |
3084 | state, because there are broken clients that try VRFY before RCPT. A 5xx | |
3085 | response should be given only when the address is positively known to be | |
4f6ae5c3 JH |
3086 | undeliverable. Sigh. We return 252 if there is no VRFY ACL or it provides |
3087 | no explicit code, but if there is one we let it know best. | |
3088 | Also, for ETRN, 458 is given on refusal, and for AUTH, 503. | |
a5bd321b PH |
3089 | |
3090 | From Exim 4.63, it is possible to override the response code details by | |
3091 | providing a suitable response code string at the start of the message provided | |
3092 | in user_msg. The code's first digit is checked for validity. | |
059ec3d9 PH |
3093 | |
3094 | Arguments: | |
4f6ae5c3 JH |
3095 | where where the ACL was called from |
3096 | rc the failure code | |
3097 | user_msg a message that can be included in an SMTP response | |
3098 | log_msg a message for logging | |
059ec3d9 PH |
3099 | |
3100 | Returns: 0 in most cases | |
3101 | 2 if the failure code was FAIL_DROP, in which case the | |
3102 | SMTP connection should be dropped (this value fits with the | |
3103 | "done" variable in smtp_setup_msg() below) | |
3104 | */ | |
3105 | ||
3106 | int | |
3107 | smtp_handle_acl_fail(int where, int rc, uschar *user_msg, uschar *log_msg) | |
3108 | { | |
059ec3d9 | 3109 | BOOL drop = rc == FAIL_DROP; |
a5bd321b | 3110 | int codelen = 3; |
a5bd321b | 3111 | uschar *smtp_code; |
059ec3d9 PH |
3112 | uschar *lognl; |
3113 | uschar *sender_info = US""; | |
64ffc24f | 3114 | uschar *what = |
8523533c | 3115 | #ifdef WITH_CONTENT_SCAN |
3cc3f762 | 3116 | where == ACL_WHERE_MIME ? US"during MIME ACL checks" : |
8e669ac1 | 3117 | #endif |
3cc3f762 JH |
3118 | where == ACL_WHERE_PREDATA ? US"DATA" : |
3119 | where == ACL_WHERE_DATA ? US"after DATA" : | |
8ccd00b1 | 3120 | #ifndef DISABLE_PRDR |
3cc3f762 | 3121 | where == ACL_WHERE_PRDR ? US"after DATA PRDR" : |
fd98a5c6 | 3122 | #endif |
3cc3f762 JH |
3123 | smtp_cmd_data ? |
3124 | string_sprintf("%s %s", acl_wherenames[where], smtp_cmd_data) : | |
3125 | string_sprintf("%s in \"connect\" ACL", acl_wherenames[where]); | |
059ec3d9 PH |
3126 | |
3127 | if (drop) rc = FAIL; | |
3128 | ||
4e88a19f | 3129 | /* Set the default SMTP code, and allow a user message to change it. */ |
a5bd321b | 3130 | |
4f6ae5c3 JH |
3131 | smtp_code = rc == FAIL ? acl_wherecodes[where] : US"451"; |
3132 | smtp_message_code(&smtp_code, &codelen, &user_msg, &log_msg, | |
3133 | where != ACL_WHERE_VRFY); | |
a5bd321b | 3134 | |
059ec3d9 PH |
3135 | /* We used to have sender_address here; however, there was a bug that was not |
3136 | updating sender_address after a rewrite during a verify. When this bug was | |
3137 | fixed, sender_address at this point became the rewritten address. I'm not sure | |
3138 | this is what should be logged, so I've changed to logging the unrewritten | |
3139 | address to retain backward compatibility. */ | |
3140 | ||
8523533c | 3141 | #ifndef WITH_CONTENT_SCAN |
059ec3d9 | 3142 | if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA) |
8523533c TK |
3143 | #else |
3144 | if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA || where == ACL_WHERE_MIME) | |
3145 | #endif | |
059ec3d9 | 3146 | { |
b98bb9ac PP |
3147 | sender_info = string_sprintf("F=<%s>%s%s%s%s ", |
3148 | sender_address_unrewritten ? sender_address_unrewritten : sender_address, | |
3149 | sender_host_authenticated ? US" A=" : US"", | |
3150 | sender_host_authenticated ? sender_host_authenticated : US"", | |
3151 | sender_host_authenticated && authenticated_id ? US":" : US"", | |
3152 | sender_host_authenticated && authenticated_id ? authenticated_id : US"" | |
3153 | ); | |
059ec3d9 PH |
3154 | } |
3155 | ||
3156 | /* If there's been a sender verification failure with a specific message, and | |
3157 | we have not sent a response about it yet, do so now, as a preliminary line for | |
278c6e6c PH |
3158 | failures, but not defers. However, always log it for defer, and log it for fail |
3159 | unless the sender_verify_fail log selector has been turned off. */ | |
059ec3d9 | 3160 | |
02b41d71 | 3161 | if (sender_verified_failed && |
059ec3d9 PH |
3162 | !testflag(sender_verified_failed, af_sverify_told)) |
3163 | { | |
2679d413 PH |
3164 | BOOL save_rcpt_in_progress = rcpt_in_progress; |
3165 | rcpt_in_progress = FALSE; /* So as not to treat these as the error */ | |
3166 | ||
059ec3d9 PH |
3167 | setflag(sender_verified_failed, af_sverify_told); |
3168 | ||
6c6d6e48 | 3169 | if (rc != FAIL || LOGGING(sender_verify_fail)) |
278c6e6c PH |
3170 | log_write(0, LOG_MAIN|LOG_REJECT, "%s sender verify %s for <%s>%s", |
3171 | host_and_ident(TRUE), | |
3172 | ((sender_verified_failed->special_action & 255) == DEFER)? "defer":"fail", | |
3173 | sender_verified_failed->address, | |
3174 | (sender_verified_failed->message == NULL)? US"" : | |
3175 | string_sprintf(": %s", sender_verified_failed->message)); | |
059ec3d9 | 3176 | |
02b41d71 | 3177 | if (rc == FAIL && sender_verified_failed->user_message) |
a5bd321b | 3178 | smtp_respond(smtp_code, codelen, FALSE, string_sprintf( |
059ec3d9 PH |
3179 | testflag(sender_verified_failed, af_verify_pmfail)? |
3180 | "Postmaster verification failed while checking <%s>\n%s\n" | |
3181 | "Several RFCs state that you are required to have a postmaster\n" | |
3182 | "mailbox for each mail domain. This host does not accept mail\n" | |
3183 | "from domains whose servers reject the postmaster address." | |
3184 | : | |
3185 | testflag(sender_verified_failed, af_verify_nsfail)? | |
3186 | "Callback setup failed while verifying <%s>\n%s\n" | |
3187 | "The initial connection, or a HELO or MAIL FROM:<> command was\n" | |
3188 | "rejected. Refusing MAIL FROM:<> does not help fight spam, disregards\n" | |
3189 | "RFC requirements, and stops you from receiving standard bounce\n" | |
3190 | "messages. This host does not accept mail from domains whose servers\n" | |
3191 | "refuse bounces." | |
3192 | : | |
3193 | "Verification failed for <%s>\n%s", | |
3194 | sender_verified_failed->address, | |
3195 | sender_verified_failed->user_message)); | |
2679d413 PH |
3196 | |
3197 | rcpt_in_progress = save_rcpt_in_progress; | |
059ec3d9 PH |
3198 | } |
3199 | ||
3200 | /* Sort out text for logging */ | |
3201 | ||
3cc3f762 JH |
3202 | log_msg = log_msg ? string_sprintf(": %s", log_msg) : US""; |
3203 | if ((lognl = Ustrchr(log_msg, '\n'))) *lognl = 0; | |
059ec3d9 PH |
3204 | |
3205 | /* Send permanent failure response to the command, but the code used isn't | |
3206 | always a 5xx one - see comments at the start of this function. If the original | |
3207 | rc was FAIL_DROP we drop the connection and yield 2. */ | |
3208 | ||
ff5929e3 JH |
3209 | if (rc == FAIL) |
3210 | smtp_respond(smtp_code, codelen, TRUE, | |
3211 | user_msg ? user_msg : US"Administrative prohibition"); | |
059ec3d9 PH |
3212 | |
3213 | /* Send temporary failure response to the command. Don't give any details, | |
3214 | unless acl_temp_details is set. This is TRUE for a callout defer, a "defer" | |
3215 | verb, and for a header verify when smtp_return_error_details is set. | |
3216 | ||
3217 | This conditional logic is all somewhat of a mess because of the odd | |
3218 | interactions between temp_details and return_error_details. One day it should | |
3219 | be re-implemented in a tidier fashion. */ | |
3220 | ||
3221 | else | |
ff5929e3 | 3222 | if (acl_temp_details && user_msg) |
059ec3d9 | 3223 | { |
ff5929e3 JH |
3224 | if ( smtp_return_error_details |
3225 | && sender_verified_failed | |
3226 | && sender_verified_failed->message | |
3227 | ) | |
a5bd321b | 3228 | smtp_respond(smtp_code, codelen, FALSE, sender_verified_failed->message); |
ff5929e3 | 3229 | |
a5bd321b | 3230 | smtp_respond(smtp_code, codelen, TRUE, user_msg); |
059ec3d9 PH |
3231 | } |
3232 | else | |
a5bd321b PH |
3233 | smtp_respond(smtp_code, codelen, TRUE, |
3234 | US"Temporary local problem - please try later"); | |
059ec3d9 | 3235 | |
6ea85e9a PH |
3236 | /* Log the incident to the logs that are specified by log_reject_target |
3237 | (default main, reject). This can be empty to suppress logging of rejections. If | |
3238 | the connection is not forcibly to be dropped, return 0. Otherwise, log why it | |
3239 | is closing if required and return 2. */ | |
059ec3d9 | 3240 | |
6ea85e9a | 3241 | if (log_reject_target != 0) |
887291d2 | 3242 | { |
e45a1c37 | 3243 | #ifdef SUPPORT_TLS |
fc16abb4 JH |
3244 | uschar * tls = s_tlslog(NULL, NULL, NULL); |
3245 | if (!tls) tls = US""; | |
e45a1c37 | 3246 | #else |
fc16abb4 | 3247 | uschar * tls = US""; |
e45a1c37 | 3248 | #endif |
3cc3f762 JH |
3249 | log_write(where == ACL_WHERE_CONNECT ? L_connection_reject : 0, |
3250 | log_reject_target, "%s%s%s %s%srejected %s%s", | |
fc16abb4 JH |
3251 | LOGGING(dnssec) && sender_host_dnssec ? US" DS" : US"", |
3252 | host_and_ident(TRUE), | |
3253 | tls, | |
3254 | sender_info, | |
3255 | rc == FAIL ? US"" : US"temporarily ", | |
3256 | what, log_msg); | |
887291d2 | 3257 | } |
059ec3d9 PH |
3258 | |
3259 | if (!drop) return 0; | |
3260 | ||
3261 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by DROP in ACL", | |
3262 | smtp_get_connection_info()); | |
8f128379 PH |
3263 | |
3264 | /* Run the not-quit ACL, but without any custom messages. This should not be a | |
3265 | problem, because we get here only if some other ACL has issued "drop", and | |
3266 | in that case, *its* custom messages will have been used above. */ | |
3267 | ||
3268 | smtp_notquit_exit(US"acl-drop", NULL, NULL); | |
059ec3d9 PH |
3269 | return 2; |
3270 | } | |
3271 | ||
3272 | ||
3273 | ||
3274 | ||
8f128379 PH |
3275 | /************************************************* |
3276 | * Handle SMTP exit when QUIT is not given * | |
3277 | *************************************************/ | |
3278 | ||
3279 | /* This function provides a logging/statistics hook for when an SMTP connection | |
3280 | is dropped on the floor or the other end goes away. It's a global function | |
3281 | because it's called from receive.c as well as this module. As well as running | |
3282 | the NOTQUIT ACL, if there is one, this function also outputs a final SMTP | |
3283 | response, either with a custom message from the ACL, or using a default. There | |
3284 | is one case, however, when no message is output - after "drop". In that case, | |
3285 | the ACL that obeyed "drop" has already supplied the custom message, and NULL is | |
3286 | passed to this function. | |
3287 | ||
3288 | In case things go wrong while processing this function, causing an error that | |
4c04137d | 3289 | may re-enter this function, there is a recursion check. |
8f128379 PH |
3290 | |
3291 | Arguments: | |
3292 | reason What $smtp_notquit_reason will be set to in the ACL; | |
3293 | if NULL, the ACL is not run | |
3294 | code The error code to return as part of the response | |
3295 | defaultrespond The default message if there's no user_msg | |
3296 | ||
3297 | Returns: Nothing | |
3298 | */ | |
3299 | ||
3300 | void | |
3301 | smtp_notquit_exit(uschar *reason, uschar *code, uschar *defaultrespond, ...) | |
3302 | { | |
3303 | int rc; | |
3304 | uschar *user_msg = NULL; | |
3305 | uschar *log_msg = NULL; | |
3306 | ||
3307 | /* Check for recursive acll */ | |
3308 | ||
3309 | if (smtp_exit_function_called) | |
3310 | { | |
3311 | log_write(0, LOG_PANIC, "smtp_notquit_exit() called more than once (%s)", | |
3312 | reason); | |
3313 | return; | |
3314 | } | |
3315 | smtp_exit_function_called = TRUE; | |
3316 | ||
3317 | /* Call the not-QUIT ACL, if there is one, unless no reason is given. */ | |
3318 | ||
eea0defe | 3319 | if (acl_smtp_notquit && reason) |
8f128379 PH |
3320 | { |
3321 | smtp_notquit_reason = reason; | |
eea0defe JB |
3322 | if ((rc = acl_check(ACL_WHERE_NOTQUIT, NULL, acl_smtp_notquit, &user_msg, |
3323 | &log_msg)) == ERROR) | |
8f128379 PH |
3324 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL for not-QUIT returned ERROR: %s", |
3325 | log_msg); | |
3326 | } | |
3327 | ||
3328 | /* Write an SMTP response if we are expected to give one. As the default | |
3329 | responses are all internal, they should always fit in the buffer, but code a | |
3330 | warning, just in case. Note that string_vformat() still leaves a complete | |
3331 | string, even if it is incomplete. */ | |
3332 | ||
eea0defe | 3333 | if (code && defaultrespond) |
8f128379 | 3334 | { |
eea0defe JB |
3335 | if (user_msg) |
3336 | smtp_respond(code, 3, TRUE, user_msg); | |
3337 | else | |
8f128379 PH |
3338 | { |
3339 | uschar buffer[128]; | |
3340 | va_list ap; | |
3341 | va_start(ap, defaultrespond); | |
3342 | if (!string_vformat(buffer, sizeof(buffer), CS defaultrespond, ap)) | |
3343 | log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_notquit_exit()"); | |
3344 | smtp_printf("%s %s\r\n", code, buffer); | |
3345 | va_end(ap); | |
3346 | } | |
8f128379 PH |
3347 | mac_smtp_fflush(); |
3348 | } | |
3349 | } | |
3350 | ||
3351 | ||
3352 | ||
3353 | ||
d7b47fd0 PH |
3354 | /************************************************* |
3355 | * Verify HELO argument * | |
3356 | *************************************************/ | |
3357 | ||
3358 | /* This function is called if helo_verify_hosts or helo_try_verify_hosts is | |
3359 | matched. It is also called from ACL processing if verify = helo is used and | |
3360 | verification was not previously tried (i.e. helo_try_verify_hosts was not | |
3361 | matched). The result of its processing is to set helo_verified and | |
3362 | helo_verify_failed. These variables should both be FALSE for this function to | |
3363 | be called. | |
3364 | ||
3365 | Note that EHLO/HELO is legitimately allowed to quote an address literal. Allow | |
3366 | for IPv6 ::ffff: literals. | |
3367 | ||
3368 | Argument: none | |
3369 | Returns: TRUE if testing was completed; | |
3370 | FALSE on a temporary failure | |
3371 | */ | |
3372 | ||
3373 | BOOL | |
3374 | smtp_verify_helo(void) | |
3375 | { | |
3376 | BOOL yield = TRUE; | |
3377 | ||
3378 | HDEBUG(D_receive) debug_printf("verifying EHLO/HELO argument \"%s\"\n", | |
3379 | sender_helo_name); | |
3380 | ||
3381 | if (sender_helo_name == NULL) | |
3382 | { | |
3383 | HDEBUG(D_receive) debug_printf("no EHLO/HELO command was issued\n"); | |
3384 | } | |
3385 | ||
d1d5595c PH |
3386 | /* Deal with the case of -bs without an IP address */ |
3387 | ||
3388 | else if (sender_host_address == NULL) | |
3389 | { | |
3390 | HDEBUG(D_receive) debug_printf("no client IP address: assume success\n"); | |
3391 | helo_verified = TRUE; | |
3392 | } | |
3393 | ||
3394 | /* Deal with the more common case when there is a sending IP address */ | |
3395 | ||
d7b47fd0 PH |
3396 | else if (sender_helo_name[0] == '[') |
3397 | { | |
3398 | helo_verified = Ustrncmp(sender_helo_name+1, sender_host_address, | |
3399 | Ustrlen(sender_host_address)) == 0; | |
3400 | ||
3401 | #if HAVE_IPV6 | |
3402 | if (!helo_verified) | |
3403 | { | |
3404 | if (strncmpic(sender_host_address, US"::ffff:", 7) == 0) | |
3405 | helo_verified = Ustrncmp(sender_helo_name + 1, | |
3406 | sender_host_address + 7, Ustrlen(sender_host_address) - 7) == 0; | |
3407 | } | |
3408 | #endif | |
3409 | ||
3410 | HDEBUG(D_receive) | |
3411 | { if (helo_verified) debug_printf("matched host address\n"); } | |
3412 | } | |
3413 | ||
3414 | /* Do a reverse lookup if one hasn't already given a positive or negative | |
3415 | response. If that fails, or the name doesn't match, try checking with a forward | |
3416 | lookup. */ | |
3417 | ||
3418 | else | |
3419 | { | |
3420 | if (sender_host_name == NULL && !host_lookup_failed) | |
3421 | yield = host_name_lookup() != DEFER; | |
3422 | ||
3423 | /* If a host name is known, check it and all its aliases. */ | |
3424 | ||
1705dd20 JH |
3425 | if (sender_host_name) |
3426 | if ((helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0)) | |
d7b47fd0 | 3427 | { |
1705dd20 | 3428 | sender_helo_dnssec = sender_host_dnssec; |
d7b47fd0 PH |
3429 | HDEBUG(D_receive) debug_printf("matched host name\n"); |
3430 | } | |
3431 | else | |
3432 | { | |
3433 | uschar **aliases = sender_host_aliases; | |
1705dd20 JH |
3434 | while (*aliases) |
3435 | if ((helo_verified = strcmpic(*aliases++, sender_helo_name) == 0)) | |
3436 | { | |
3437 | sender_helo_dnssec = sender_host_dnssec; | |
3438 | break; | |
3439 | } | |
3440 | ||
3441 | HDEBUG(D_receive) if (helo_verified) | |
d7b47fd0 | 3442 | debug_printf("matched alias %s\n", *(--aliases)); |
d7b47fd0 | 3443 | } |
d7b47fd0 PH |
3444 | |
3445 | /* Final attempt: try a forward lookup of the helo name */ | |
3446 | ||
3447 | if (!helo_verified) | |
3448 | { | |
3449 | int rc; | |
3450 | host_item h; | |
1705dd20 JH |
3451 | dnssec_domains d; |
3452 | host_item *hh; | |
3453 | ||
d7b47fd0 PH |
3454 | h.name = sender_helo_name; |
3455 | h.address = NULL; | |
3456 | h.mx = MX_NONE; | |
3457 | h.next = NULL; | |
1705dd20 JH |
3458 | d.request = US"*"; |
3459 | d.require = US""; | |
3460 | ||
d7b47fd0 PH |
3461 | HDEBUG(D_receive) debug_printf("getting IP address for %s\n", |
3462 | sender_helo_name); | |
1705dd20 JH |
3463 | rc = host_find_bydns(&h, NULL, HOST_FIND_BY_A, |
3464 | NULL, NULL, NULL, &d, NULL, NULL); | |
d7b47fd0 | 3465 | if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL) |
1705dd20 | 3466 | for (hh = &h; hh; hh = hh->next) |
d7b47fd0 PH |
3467 | if (Ustrcmp(hh->address, sender_host_address) == 0) |
3468 | { | |
3469 | helo_verified = TRUE; | |
1705dd20 | 3470 | if (h.dnssec == DS_YES) sender_helo_dnssec = TRUE; |
d7b47fd0 | 3471 | HDEBUG(D_receive) |
1705dd20 JH |
3472 | { |
3473 | debug_printf("IP address for %s matches calling address\n" | |
3474 | "Forward DNS security status: %sverified\n", | |
3475 | sender_helo_name, sender_helo_dnssec ? "" : "un"); | |
3476 | } | |
d7b47fd0 PH |
3477 | break; |
3478 | } | |
d7b47fd0 PH |
3479 | } |
3480 | } | |
3481 | ||
d1d5595c | 3482 | if (!helo_verified) helo_verify_failed = TRUE; /* We've tried ... */ |
d7b47fd0 PH |
3483 | return yield; |
3484 | } | |
3485 | ||
3486 | ||
3487 | ||
3488 | ||
4e88a19f PH |
3489 | /************************************************* |
3490 | * Send user response message * | |
3491 | *************************************************/ | |
3492 | ||
3493 | /* This function is passed a default response code and a user message. It calls | |
3494 | smtp_message_code() to check and possibly modify the response code, and then | |
3495 | calls smtp_respond() to transmit the response. I put this into a function | |
3496 | just to avoid a lot of repetition. | |
3497 | ||
3498 | Arguments: | |
3499 | code the response code | |
3500 | user_msg the user message | |
3501 | ||
3502 | Returns: nothing | |
3503 | */ | |
3504 | ||
3505 | static void | |
3506 | smtp_user_msg(uschar *code, uschar *user_msg) | |
3507 | { | |
3508 | int len = 3; | |
4f6ae5c3 | 3509 | smtp_message_code(&code, &len, &user_msg, NULL, TRUE); |
4e88a19f PH |
3510 | smtp_respond(code, len, TRUE, user_msg); |
3511 | } | |
3512 | ||
3513 | ||
3514 | ||
b3ef41c9 JH |
3515 | static int |
3516 | smtp_in_auth(auth_instance *au, uschar ** s, uschar ** ss) | |
3517 | { | |
3518 | const uschar *set_id = NULL; | |
3519 | int rc, i; | |
3520 | ||
3521 | /* Run the checking code, passing the remainder of the command line as | |
3522 | data. Initials the $auth<n> variables as empty. Initialize $0 empty and set | |
3523 | it as the only set numerical variable. The authenticator may set $auth<n> | |
3524 | and also set other numeric variables. The $auth<n> variables are preferred | |
3525 | nowadays; the numerical variables remain for backwards compatibility. | |
3526 | ||
3527 | Afterwards, have a go at expanding the set_id string, even if | |
3528 | authentication failed - for bad passwords it can be useful to log the | |
3529 | userid. On success, require set_id to expand and exist, and put it in | |
3530 | authenticated_id. Save this in permanent store, as the working store gets | |
3531 | reset at HELO, RSET, etc. */ | |
3532 | ||
3533 | for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; | |
3534 | expand_nmax = 0; | |
3535 | expand_nlength[0] = 0; /* $0 contains nothing */ | |
3536 | ||
3537 | rc = (au->info->servercode)(au, smtp_cmd_data); | |
3538 | if (au->set_id) set_id = expand_string(au->set_id); | |
3539 | expand_nmax = -1; /* Reset numeric variables */ | |
3540 | for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; /* Reset $auth<n> */ | |
3541 | ||
3542 | /* The value of authenticated_id is stored in the spool file and printed in | |
3543 | log lines. It must not contain binary zeros or newline characters. In | |
3544 | normal use, it never will, but when playing around or testing, this error | |
3545 | can (did) happen. To guard against this, ensure that the id contains only | |
3546 | printing characters. */ | |
3547 | ||
3548 | if (set_id) set_id = string_printing(set_id); | |
3549 | ||
3550 | /* For the non-OK cases, set up additional logging data if set_id | |
3551 | is not empty. */ | |
3552 | ||
3553 | if (rc != OK) | |
3554 | set_id = set_id && *set_id | |
3555 | ? string_sprintf(" (set_id=%s)", set_id) : US""; | |
3556 | ||
3557 | /* Switch on the result */ | |
3558 | ||
3559 | switch(rc) | |
3560 | { | |
3561 | case OK: | |
3562 | if (!au->set_id || set_id) /* Complete success */ | |
3563 | { | |
3564 | if (set_id) authenticated_id = string_copy_malloc(set_id); | |
3565 | sender_host_authenticated = au->name; | |
3566 | authentication_failed = FALSE; | |
3567 | authenticated_fail_id = NULL; /* Impossible to already be set? */ | |
3568 | ||
3569 | received_protocol = | |
3570 | (sender_host_address ? protocols : protocols_local) | |
3571 | [pextend + pauthed + (tls_in.active >= 0 ? pcrpted:0)]; | |
3572 | *s = *ss = US"235 Authentication succeeded"; | |
3573 | authenticated_by = au; | |
3574 | break; | |
3575 | } | |
3576 | ||
3577 | /* Authentication succeeded, but we failed to expand the set_id string. | |
3578 | Treat this as a temporary error. */ | |
3579 | ||
3580 | auth_defer_msg = expand_string_message; | |
3581 | /* Fall through */ | |
3582 | ||
3583 | case DEFER: | |
3584 | if (set_id) authenticated_fail_id = string_copy_malloc(set_id); | |
3585 | *s = string_sprintf("435 Unable to authenticate at present%s", | |
3586 | auth_defer_user_msg); | |
3587 | *ss = string_sprintf("435 Unable to authenticate at present%s: %s", | |
3588 | set_id, auth_defer_msg); | |
3589 | break; | |
3590 | ||
3591 | case BAD64: | |
3592 | *s = *ss = US"501 Invalid base64 data"; | |
3593 | break; | |
3594 | ||
3595 | case CANCELLED: | |
3596 | *s = *ss = US"501 Authentication cancelled"; | |
3597 | break; | |
3598 | ||
3599 | case UNEXPECTED: | |
3600 | *s = *ss = US"553 Initial data not expected"; | |
3601 | break; | |
3602 | ||
3603 | case FAIL: | |
3604 | if (set_id) authenticated_fail_id = string_copy_malloc(set_id); | |
3605 | *s = US"535 Incorrect authentication data"; | |
3606 | *ss = string_sprintf("535 Incorrect authentication data%s", set_id); | |
3607 | break; | |
3608 | ||
3609 | default: | |
3610 | if (set_id) authenticated_fail_id = string_copy_malloc(set_id); | |
3611 | *s = US"435 Internal error"; | |
3612 | *ss = string_sprintf("435 Internal error%s: return %d from authentication " | |
3613 | "check", set_id, rc); | |
3614 | break; | |
3615 | } | |
3616 | ||
3617 | return rc; | |
3618 | } | |
3619 | ||
3620 | ||
3621 | ||
2685d6e0 JH |
3622 | |
3623 | ||
3624 | static int | |
3625 | qualify_recipient(uschar ** recipient, uschar * smtp_cmd_data, uschar * tag) | |
3626 | { | |
3627 | int rd; | |
3628 | if (allow_unqualified_recipient || strcmpic(*recipient, US"postmaster") == 0) | |
3629 | { | |
3630 | DEBUG(D_receive) debug_printf("unqualified address %s accepted\n", | |
3631 | *recipient); | |
3632 | rd = Ustrlen(recipient) + 1; | |
3633 | *recipient = rewrite_address_qualify(*recipient, TRUE); | |
3634 | return rd; | |
3635 | } | |
3636 | smtp_printf("501 %s: recipient address must contain a domain\r\n", | |
3637 | smtp_cmd_data); | |
3638 | log_write(L_smtp_syntax_error, | |
3639 | LOG_MAIN|LOG_REJECT, "unqualified %s rejected: <%s> %s%s", | |
3640 | tag, *recipient, host_and_ident(TRUE), host_lookup_msg); | |
3641 | return 0; | |
3642 | } | |
3643 | ||
3644 | ||
3645 | ||
3646 | ||
7e3ce68e JH |
3647 | static void |
3648 | smtp_quit_handler(uschar ** user_msgp, uschar ** log_msgp) | |
3649 | { | |
3650 | HAD(SCH_QUIT); | |
3651 | incomplete_transaction_log(US"QUIT"); | |
60d10ce7 | 3652 | if (acl_smtp_quit) |
7e3ce68e JH |
3653 | { |
3654 | int rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, user_msgp, log_msgp); | |
3655 | if (rc == ERROR) | |
3656 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s", | |
3657 | *log_msgp); | |
3658 | } | |
3659 | if (*user_msgp) | |
3660 | smtp_respond(US"221", 3, TRUE, *user_msgp); | |
3661 | else | |
3662 | smtp_printf("221 %s closing connection\r\n", smtp_active_hostname); | |
3663 | ||
3664 | #ifdef SUPPORT_TLS | |
3665 | tls_close(TRUE, TRUE); | |
3666 | #endif | |
3667 | ||
3668 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT", | |
3669 | smtp_get_connection_info()); | |
3670 | } | |
3671 | ||
3672 | ||
3673 | static void | |
3674 | smtp_rset_handler(void) | |
3675 | { | |
3676 | HAD(SCH_RSET); | |
3677 | incomplete_transaction_log(US"RSET"); | |
3678 | smtp_printf("250 Reset OK\r\n"); | |
3679 | cmd_list[CMD_LIST_RSET].is_mail_cmd = FALSE; | |
3680 | } | |
3681 | ||
3682 | ||
3683 | ||
059ec3d9 PH |
3684 | /************************************************* |
3685 | * Initialize for SMTP incoming message * | |
3686 | *************************************************/ | |
3687 | ||
3688 | /* This function conducts the initial dialogue at the start of an incoming SMTP | |
3689 | message, and builds a list of recipients. However, if the incoming message | |
3690 | is part of a batch (-bS option) a separate function is called since it would | |
3691 | be messy having tests splattered about all over this function. This function | |
3692 | therefore handles the case where interaction is occurring. The input and output | |
3693 | files are set up in smtp_in and smtp_out. | |
3694 | ||
3695 | The global recipients_list is set to point to a vector of recipient_item | |
3696 | blocks, whose number is given by recipients_count. This is extended by the | |
3697 | receive_add_recipient() function. The global variable sender_address is set to | |
3698 | the sender's address. The yield is +1 if a message has been successfully | |
3699 | started, 0 if a QUIT command was encountered or the connection was refused from | |
3700 | the particular host, or -1 if the connection was lost. | |
3701 | ||
3702 | Argument: none | |
3703 | ||
3704 | Returns: > 0 message successfully started (reached DATA) | |
3705 | = 0 QUIT read or end of file reached or call refused | |
3706 | < 0 lost connection | |
3707 | */ | |
3708 | ||
3709 | int | |
3710 | smtp_setup_msg(void) | |
3711 | { | |
3712 | int done = 0; | |
3713 | BOOL toomany = FALSE; | |
3714 | BOOL discarded = FALSE; | |
3715 | BOOL last_was_rej_mail = FALSE; | |
3716 | BOOL last_was_rcpt = FALSE; | |
3717 | void *reset_point = store_get(0); | |
3718 | ||
3719 | DEBUG(D_receive) debug_printf("smtp_setup_msg entered\n"); | |
3720 | ||
3721 | /* Reset for start of new message. We allow one RSET not to be counted as a | |
3722 | nonmail command, for those MTAs that insist on sending it between every | |
3723 | message. Ditto for EHLO/HELO and for STARTTLS, to allow for going in and out of | |
3724 | TLS between messages (an Exim client may do this if it has messages queued up | |
3725 | for the host). Note: we do NOT reset AUTH at this point. */ | |
3726 | ||
3727 | smtp_reset(reset_point); | |
3728 | message_ended = END_NOTSTARTED; | |
3729 | ||
7e3ce68e JH |
3730 | chunking_state = chunking_offered ? CHUNKING_OFFERED : CHUNKING_NOT_OFFERED; |
3731 | ||
059ec3d9 PH |
3732 | cmd_list[CMD_LIST_RSET].is_mail_cmd = TRUE; |
3733 | cmd_list[CMD_LIST_HELO].is_mail_cmd = TRUE; | |
3734 | cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE; | |
3735 | #ifdef SUPPORT_TLS | |
3736 | cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = TRUE; | |
b3ef41c9 | 3737 | cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE; |
059ec3d9 PH |
3738 | #endif |
3739 | ||
3740 | /* Set the local signal handler for SIGTERM - it tries to end off tidily */ | |
3741 | ||
3742 | os_non_restarting_signal(SIGTERM, command_sigterm_handler); | |
3743 | ||
3744 | /* Batched SMTP is handled in a different function. */ | |
3745 | ||
3746 | if (smtp_batched_input) return smtp_setup_batch_msg(); | |
3747 | ||
3748 | /* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE | |
3749 | value. The values are 2 larger than the required yield of the function. */ | |
3750 | ||
3751 | while (done <= 0) | |
3752 | { | |
55414b25 | 3753 | const uschar **argv; |
059ec3d9 PH |
3754 | uschar *etrn_command; |
3755 | uschar *etrn_serialize_key; | |
3756 | uschar *errmess; | |
4e88a19f PH |
3757 | uschar *log_msg, *smtp_code; |
3758 | uschar *user_msg = NULL; | |
059ec3d9 PH |
3759 | uschar *recipient = NULL; |
3760 | uschar *hello = NULL; | |
059ec3d9 PH |
3761 | uschar *s, *ss; |
3762 | BOOL was_rej_mail = FALSE; | |
3763 | BOOL was_rcpt = FALSE; | |
3764 | void (*oldsignal)(int); | |
3765 | pid_t pid; | |
3766 | int start, end, sender_domain, recipient_domain; | |
3767 | int ptr, size, rc; | |
aa7751be | 3768 | int c; |
059ec3d9 | 3769 | auth_instance *au; |
6c1c3d1d WB |
3770 | uschar *orcpt = NULL; |
3771 | int flags; | |
059ec3d9 | 3772 | |
16be7f11 | 3773 | #ifdef AUTH_TLS |
b3ef41c9 JH |
3774 | /* Check once per STARTTLS or SSL-on-connect for a TLS AUTH */ |
3775 | if ( tls_in.active >= 0 | |
3776 | && tls_in.peercert | |
3777 | && tls_in.certificate_verified | |
3778 | && cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd | |
3779 | ) | |
3780 | { | |
3781 | cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = FALSE; | |
4f6ae5c3 JH |
3782 | if ( acl_smtp_auth |
3783 | && (rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth, | |
3784 | &user_msg, &log_msg)) != OK | |
3785 | ) | |
b3ef41c9 | 3786 | { |
4f6ae5c3 JH |
3787 | done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg); |
3788 | continue; | |
b3ef41c9 JH |
3789 | } |
3790 | ||
3791 | for (au = auths; au; au = au->next) | |
3792 | if (strcmpic(US"tls", au->driver_name) == 0) | |
3793 | { | |
3794 | smtp_cmd_data = NULL; | |
3795 | ||
805bb5c3 | 3796 | if (smtp_in_auth(au, &s, &ss) == OK) |
cb570b5e | 3797 | { DEBUG(D_auth) debug_printf("tls auth succeeded\n"); } |
805bb5c3 | 3798 | else |
cb570b5e | 3799 | { DEBUG(D_auth) debug_printf("tls auth not succeeded\n"); } |
b3ef41c9 JH |
3800 | break; |
3801 | } | |
3802 | } | |
3803 | #endif | |
3804 | ||
8d330698 JH |
3805 | #ifdef TCP_QUICKACK |
3806 | if (smtp_in) /* Avoid pure-ACKs while in cmd pingpong phase */ | |
3807 | (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK, | |
3808 | US &off, sizeof(off)); | |
3809 | #endif | |
3810 | ||
bd8fbe36 | 3811 | switch(smtp_read_command(TRUE, GETC_BUFFER_UNLIMITED)) |
059ec3d9 PH |
3812 | { |
3813 | /* The AUTH command is not permitted to occur inside a transaction, and may | |
c46782ef PH |
3814 | occur successfully only once per connection. Actually, that isn't quite |
3815 | true. When TLS is started, all previous information about a connection must | |
3816 | be discarded, so a new AUTH is permitted at that time. | |
3817 | ||
3818 | AUTH may only be used when it has been advertised. However, it seems that | |
3819 | there are clients that send AUTH when it hasn't been advertised, some of | |
3820 | them even doing this after HELO. And there are MTAs that accept this. Sigh. | |
3821 | So there's a get-out that allows this to happen. | |
059ec3d9 PH |
3822 | |
3823 | AUTH is initially labelled as a "nonmail command" so that one occurrence | |
3824 | doesn't get counted. We change the label here so that multiple failing | |
3825 | AUTHS will eventually hit the nonmail threshold. */ | |
3826 | ||
3827 | case AUTH_CMD: | |
b4ed4da0 | 3828 | HAD(SCH_AUTH); |
059ec3d9 PH |
3829 | authentication_failed = TRUE; |
3830 | cmd_list[CMD_LIST_AUTH].is_mail_cmd = FALSE; | |
3831 | ||
c46782ef | 3832 | if (!auth_advertised && !allow_auth_unadvertised) |
059ec3d9 PH |
3833 | { |
3834 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3835 | US"AUTH command used when not advertised"); | |
3836 | break; | |
3837 | } | |
b3ef41c9 | 3838 | if (sender_host_authenticated) |
059ec3d9 PH |
3839 | { |
3840 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3841 | US"already authenticated"); | |
3842 | break; | |
3843 | } | |
b3ef41c9 | 3844 | if (sender_address) |
059ec3d9 PH |
3845 | { |
3846 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3847 | US"not permitted in mail transaction"); | |
3848 | break; | |
3849 | } | |
3850 | ||
3851 | /* Check the ACL */ | |
3852 | ||
4f6ae5c3 JH |
3853 | if ( acl_smtp_auth |
3854 | && (rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth, | |
3855 | &user_msg, &log_msg)) != OK | |
3856 | ) | |
059ec3d9 | 3857 | { |
4f6ae5c3 JH |
3858 | done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg); |
3859 | break; | |
059ec3d9 PH |
3860 | } |
3861 | ||
3862 | /* Find the name of the requested authentication mechanism. */ | |
3863 | ||
ca86f471 PH |
3864 | s = smtp_cmd_data; |
3865 | while ((c = *smtp_cmd_data) != 0 && !isspace(c)) | |
059ec3d9 PH |
3866 | { |
3867 | if (!isalnum(c) && c != '-' && c != '_') | |
3868 | { | |
3869 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
3870 | US"invalid character in authentication mechanism name"); | |
3871 | goto COMMAND_LOOP; | |
3872 | } | |
ca86f471 | 3873 | smtp_cmd_data++; |
059ec3d9 PH |
3874 | } |
3875 | ||
3876 | /* If not at the end of the line, we must be at white space. Terminate the | |
3877 | name and move the pointer on to any data that may be present. */ | |
3878 | ||
ca86f471 | 3879 | if (*smtp_cmd_data != 0) |
059ec3d9 | 3880 | { |
ca86f471 PH |
3881 | *smtp_cmd_data++ = 0; |
3882 | while (isspace(*smtp_cmd_data)) smtp_cmd_data++; | |
059ec3d9 PH |
3883 | } |
3884 | ||
3885 | /* Search for an authentication mechanism which is configured for use | |
c46782ef PH |
3886 | as a server and which has been advertised (unless, sigh, allow_auth_ |
3887 | unadvertised is set). */ | |
059ec3d9 | 3888 | |
b3ef41c9 | 3889 | for (au = auths; au; au = au->next) |
059ec3d9 | 3890 | if (strcmpic(s, au->public_name) == 0 && au->server && |
b3ef41c9 JH |
3891 | (au->advertised || allow_auth_unadvertised)) |
3892 | break; | |
059ec3d9 | 3893 | |
b3ef41c9 | 3894 | if (au) |
059ec3d9 | 3895 | { |
b3ef41c9 | 3896 | c = smtp_in_auth(au, &s, &ss); |
059ec3d9 | 3897 | |
b3ef41c9 JH |
3898 | smtp_printf("%s\r\n", s); |
3899 | if (c != OK) | |
3900 | log_write(0, LOG_MAIN|LOG_REJECT, "%s authenticator failed for %s: %s", | |
3901 | au->name, host_and_ident(FALSE), ss); | |
059ec3d9 | 3902 | } |
b3ef41c9 JH |
3903 | else |
3904 | done = synprot_error(L_smtp_protocol_error, 504, NULL, | |
3905 | string_sprintf("%s authentication mechanism not supported", s)); | |
059ec3d9 PH |
3906 | |
3907 | break; /* AUTH_CMD */ | |
3908 | ||
3909 | /* The HELO/EHLO commands are permitted to appear in the middle of a | |
3910 | session as well as at the beginning. They have the effect of a reset in | |
3911 | addition to their other functions. Their absence at the start cannot be | |
3912 | taken to be an error. | |
3913 | ||
3914 | RFC 2821 says: | |
3915 | ||
3916 | If the EHLO command is not acceptable to the SMTP server, 501, 500, | |
3917 | or 502 failure replies MUST be returned as appropriate. The SMTP | |
3918 | server MUST stay in the same state after transmitting these replies | |
3919 | that it was in before the EHLO was received. | |
3920 | ||
3921 | Therefore, we do not do the reset until after checking the command for | |
3922 | acceptability. This change was made for Exim release 4.11. Previously | |
3923 | it did the reset first. */ | |
3924 | ||
3925 | case HELO_CMD: | |
b4ed4da0 | 3926 | HAD(SCH_HELO); |
059ec3d9 PH |
3927 | hello = US"HELO"; |
3928 | esmtp = FALSE; | |
3929 | goto HELO_EHLO; | |
3930 | ||
3931 | case EHLO_CMD: | |
b4ed4da0 | 3932 | HAD(SCH_EHLO); |
059ec3d9 PH |
3933 | hello = US"EHLO"; |
3934 | esmtp = TRUE; | |
3935 | ||
3936 | HELO_EHLO: /* Common code for HELO and EHLO */ | |
3937 | cmd_list[CMD_LIST_HELO].is_mail_cmd = FALSE; | |
3938 | cmd_list[CMD_LIST_EHLO].is_mail_cmd = FALSE; | |
3939 | ||
3940 | /* Reject the HELO if its argument was invalid or non-existent. A | |
3941 | successful check causes the argument to be saved in malloc store. */ | |
3942 | ||
ca86f471 | 3943 | if (!check_helo(smtp_cmd_data)) |
059ec3d9 PH |
3944 | { |
3945 | smtp_printf("501 Syntactically invalid %s argument(s)\r\n", hello); | |
3946 | ||
3947 | log_write(0, LOG_MAIN|LOG_REJECT, "rejected %s from %s: syntactically " | |
3948 | "invalid argument(s): %s", hello, host_and_ident(FALSE), | |
3ee512ff PH |
3949 | (*smtp_cmd_argument == 0)? US"(no argument given)" : |
3950 | string_printing(smtp_cmd_argument)); | |
059ec3d9 PH |
3951 | |
3952 | if (++synprot_error_count > smtp_max_synprot_errors) | |
3953 | { | |
3954 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
3955 | "syntax or protocol errors (last command was \"%s\")", | |
0ebc4d69 | 3956 | host_and_ident(FALSE), string_printing(smtp_cmd_buffer)); |
059ec3d9 PH |
3957 | done = 1; |
3958 | } | |
3959 | ||
3960 | break; | |
3961 | } | |
3962 | ||
3963 | /* If sender_host_unknown is true, we have got here via the -bs interface, | |
3964 | not called from inetd. Otherwise, we are running an IP connection and the | |
3965 | host address will be set. If the helo name is the primary name of this | |
3966 | host and we haven't done a reverse lookup, force one now. If helo_required | |
3967 | is set, ensure that the HELO name matches the actual host. If helo_verify | |
3968 | is set, do the same check, but softly. */ | |
3969 | ||
3970 | if (!sender_host_unknown) | |
3971 | { | |
3972 | BOOL old_helo_verified = helo_verified; | |
ca86f471 | 3973 | uschar *p = smtp_cmd_data; |
059ec3d9 PH |
3974 | |
3975 | while (*p != 0 && !isspace(*p)) { *p = tolower(*p); p++; } | |
3976 | *p = 0; | |
3977 | ||
3978 | /* Force a reverse lookup if HELO quoted something in helo_lookup_domains | |
3979 | because otherwise the log can be confusing. */ | |
3980 | ||
3981 | if (sender_host_name == NULL && | |
3982 | (deliver_domain = sender_helo_name, /* set $domain */ | |
55414b25 | 3983 | match_isinlist(sender_helo_name, CUSS &helo_lookup_domains, 0, |
059ec3d9 PH |
3984 | &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL)) == OK) |
3985 | (void)host_name_lookup(); | |
3986 | ||
3987 | /* Rebuild the fullhost info to include the HELO name (and the real name | |
3988 | if it was looked up.) */ | |
3989 | ||
3990 | host_build_sender_fullhost(); /* Rebuild */ | |
3991 | set_process_info("handling%s incoming connection from %s", | |
817d9f57 | 3992 | (tls_in.active >= 0)? " TLS" : "", host_and_ident(FALSE)); |
059ec3d9 PH |
3993 | |
3994 | /* Verify if configured. This doesn't give much security, but it does | |
d7b47fd0 PH |
3995 | make some people happy to be able to do it. If helo_required is set, |
3996 | (host matches helo_verify_hosts) failure forces rejection. If helo_verify | |
3997 | is set (host matches helo_try_verify_hosts), it does not. This is perhaps | |
3998 | now obsolescent, since the verification can now be requested selectively | |
3999 | at ACL time. */ | |
059ec3d9 | 4000 | |
1705dd20 | 4001 | helo_verified = helo_verify_failed = sender_helo_dnssec = FALSE; |
059ec3d9 PH |
4002 | if (helo_required || helo_verify) |
4003 | { | |
d7b47fd0 | 4004 | BOOL tempfail = !smtp_verify_helo(); |
059ec3d9 PH |
4005 | if (!helo_verified) |
4006 | { | |
4007 | if (helo_required) | |
4008 | { | |
4009 | smtp_printf("%d %s argument does not match calling host\r\n", | |
4010 | tempfail? 451 : 550, hello); | |
4011 | log_write(0, LOG_MAIN|LOG_REJECT, "%srejected \"%s %s\" from %s", | |
4012 | tempfail? "temporarily " : "", | |
4013 | hello, sender_helo_name, host_and_ident(FALSE)); | |
4014 | helo_verified = old_helo_verified; | |
4015 | break; /* End of HELO/EHLO processing */ | |
4016 | } | |
4017 | HDEBUG(D_all) debug_printf("%s verification failed but host is in " | |
4018 | "helo_try_verify_hosts\n", hello); | |
4019 | } | |
4020 | } | |
4021 | } | |
4022 | ||
8523533c TK |
4023 | #ifdef EXPERIMENTAL_SPF |
4024 | /* set up SPF context */ | |
4025 | spf_init(sender_helo_name, sender_host_address); | |
4026 | #endif | |
4027 | ||
a14e5636 PH |
4028 | /* Apply an ACL check if one is defined; afterwards, recheck |
4029 | synchronization in case the client started sending in a delay. */ | |
059ec3d9 | 4030 | |
4f6ae5c3 JH |
4031 | if (acl_smtp_helo) |
4032 | if ((rc = acl_check(ACL_WHERE_HELO, NULL, acl_smtp_helo, | |
4033 | &user_msg, &log_msg)) != OK) | |
059ec3d9 PH |
4034 | { |
4035 | done = smtp_handle_acl_fail(ACL_WHERE_HELO, rc, user_msg, log_msg); | |
4036 | sender_helo_name = NULL; | |
4037 | host_build_sender_fullhost(); /* Rebuild */ | |
4038 | break; | |
4039 | } | |
a14e5636 | 4040 | else if (!check_sync()) goto SYNC_FAILURE; |
059ec3d9 | 4041 | |
4e88a19f PH |
4042 | /* Generate an OK reply. The default string includes the ident if present, |
4043 | and also the IP address if present. Reflecting back the ident is intended | |
4044 | as a deterrent to mail forgers. For maximum efficiency, and also because | |
4045 | some broken systems expect each response to be in a single packet, arrange | |
4046 | that the entire reply is sent in one write(). */ | |
059ec3d9 PH |
4047 | |
4048 | auth_advertised = FALSE; | |
4049 | pipelining_advertised = FALSE; | |
d1a13eea | 4050 | #ifdef SUPPORT_TLS |
059ec3d9 | 4051 | tls_advertised = FALSE; |
d1a13eea | 4052 | #endif |
6c1c3d1d | 4053 | dsn_advertised = FALSE; |
8c5d388a | 4054 | #ifdef SUPPORT_I18N |
d1a13eea JH |
4055 | smtputf8_advertised = FALSE; |
4056 | #endif | |
059ec3d9 | 4057 | |
d6a96edc | 4058 | smtp_code = US"250 "; /* Default response code plus space*/ |
4e88a19f PH |
4059 | if (user_msg == NULL) |
4060 | { | |
4061 | s = string_sprintf("%.3s %s Hello %s%s%s", | |
4062 | smtp_code, | |
4063 | smtp_active_hostname, | |
4064 | (sender_ident == NULL)? US"" : sender_ident, | |
4065 | (sender_ident == NULL)? US"" : US" at ", | |
4066 | (sender_host_name == NULL)? sender_helo_name : sender_host_name); | |
4067 | ||
4068 | ptr = Ustrlen(s); | |
4069 | size = ptr + 1; | |
059ec3d9 | 4070 | |
4e88a19f PH |
4071 | if (sender_host_address != NULL) |
4072 | { | |
c2f669a4 JH |
4073 | s = string_catn(s, &size, &ptr, US" [", 2); |
4074 | s = string_cat (s, &size, &ptr, sender_host_address); | |
4075 | s = string_catn(s, &size, &ptr, US"]", 1); | |
4e88a19f PH |
4076 | } |
4077 | } | |
4078 | ||
d6a96edc PH |
4079 | /* A user-supplied EHLO greeting may not contain more than one line. Note |
4080 | that the code returned by smtp_message_code() includes the terminating | |
4081 | whitespace character. */ | |
059ec3d9 | 4082 | |
4e88a19f | 4083 | else |
059ec3d9 | 4084 | { |
4e88a19f | 4085 | char *ss; |
d6a96edc | 4086 | int codelen = 4; |
4f6ae5c3 | 4087 | smtp_message_code(&smtp_code, &codelen, &user_msg, NULL, TRUE); |
d6a96edc | 4088 | s = string_sprintf("%.*s%s", codelen, smtp_code, user_msg); |
4e88a19f PH |
4089 | if ((ss = strpbrk(CS s, "\r\n")) != NULL) |
4090 | { | |
4091 | log_write(0, LOG_MAIN|LOG_PANIC, "EHLO/HELO response must not contain " | |
4092 | "newlines: message truncated: %s", string_printing(s)); | |
4093 | *ss = 0; | |
4094 | } | |
4095 | ptr = Ustrlen(s); | |
4096 | size = ptr + 1; | |
059ec3d9 PH |
4097 | } |
4098 | ||
c2f669a4 | 4099 | s = string_catn(s, &size, &ptr, US"\r\n", 2); |
059ec3d9 PH |
4100 | |
4101 | /* If we received EHLO, we must create a multiline response which includes | |
4102 | the functions supported. */ | |
4103 | ||
4104 | if (esmtp) | |
4105 | { | |
4106 | s[3] = '-'; | |
4107 | ||
4108 | /* I'm not entirely happy with this, as an MTA is supposed to check | |
4109 | that it has enough room to accept a message of maximum size before | |
4110 | it sends this. However, there seems little point in not sending it. | |
4111 | The actual size check happens later at MAIL FROM time. By postponing it | |
4112 | till then, VRFY and EXPN can be used after EHLO when space is short. */ | |
4113 | ||
4114 | if (thismessage_size_limit > 0) | |
4115 | { | |
4e88a19f PH |
4116 | sprintf(CS big_buffer, "%.3s-SIZE %d\r\n", smtp_code, |
4117 | thismessage_size_limit); | |
c2f669a4 | 4118 | s = string_cat(s, &size, &ptr, big_buffer); |
059ec3d9 PH |
4119 | } |
4120 | else | |
4121 | { | |
c2f669a4 JH |
4122 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
4123 | s = string_catn(s, &size, &ptr, US"-SIZE\r\n", 7); | |
059ec3d9 PH |
4124 | } |
4125 | ||
4126 | /* Exim does not do protocol conversion or data conversion. It is 8-bit | |
4127 | clean; if it has an 8-bit character in its hand, it just sends it. It | |
4128 | cannot therefore specify 8BITMIME and remain consistent with the RFCs. | |
4129 | However, some users want this option simply in order to stop MUAs | |
4130 | mangling messages that contain top-bit-set characters. It is therefore | |
4131 | provided as an option. */ | |
4132 | ||
4133 | if (accept_8bitmime) | |
4e88a19f | 4134 | { |
c2f669a4 JH |
4135 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
4136 | s = string_catn(s, &size, &ptr, US"-8BITMIME\r\n", 11); | |
4e88a19f | 4137 | } |
059ec3d9 | 4138 | |
6c1c3d1d | 4139 | /* Advertise DSN support if configured to do so. */ |
94431adb | 4140 | if (verify_check_host(&dsn_advertise_hosts) != FAIL) |
6c1c3d1d | 4141 | { |
c2f669a4 JH |
4142 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
4143 | s = string_catn(s, &size, &ptr, US"-DSN\r\n", 6); | |
6c1c3d1d WB |
4144 | dsn_advertised = TRUE; |
4145 | } | |
6c1c3d1d | 4146 | |
bbc8ed07 JH |
4147 | /* Advertise ETRN/VRFY/EXPN if there's are ACL checking whether a host is |
4148 | permitted to issue them; a check is made when any host actually tries. */ | |
059ec3d9 | 4149 | |
bbc8ed07 | 4150 | if (acl_smtp_etrn) |
059ec3d9 | 4151 | { |
c2f669a4 JH |
4152 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
4153 | s = string_catn(s, &size, &ptr, US"-ETRN\r\n", 7); | |
059ec3d9 | 4154 | } |
bbc8ed07 JH |
4155 | if (acl_smtp_vrfy) |
4156 | { | |
4157 | s = string_catn(s, &size, &ptr, smtp_code, 3); | |
4158 | s = string_catn(s, &size, &ptr, US"-VRFY\r\n", 7); | |
4159 | } | |
4160 | if (acl_smtp_expn) | |
059ec3d9 | 4161 | { |
c2f669a4 JH |
4162 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
4163 | s = string_catn(s, &size, &ptr, US"-EXPN\r\n", 7); | |
059ec3d9 PH |
4164 | } |
4165 | ||
4166 | /* Exim is quite happy with pipelining, so let the other end know that | |
4167 | it is safe to use it, unless advertising is disabled. */ | |
4168 | ||
cf8b11a5 PH |
4169 | if (pipelining_enable && |
4170 | verify_check_host(&pipelining_advertise_hosts) == OK) | |
059ec3d9 | 4171 | { |
c2f669a4 JH |
4172 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
4173 | s = string_catn(s, &size, &ptr, US"-PIPELINING\r\n", 13); | |
059ec3d9 PH |
4174 | sync_cmd_limit = NON_SYNC_CMD_PIPELINING; |
4175 | pipelining_advertised = TRUE; | |
4176 | } | |
4177 | ||
fd98a5c6 | 4178 | |
059ec3d9 PH |
4179 | /* If any server authentication mechanisms are configured, advertise |
4180 | them if the current host is in auth_advertise_hosts. The problem with | |
4181 | advertising always is that some clients then require users to | |
4182 | authenticate (and aren't configurable otherwise) even though it may not | |
4183 | be necessary (e.g. if the host is in host_accept_relay). | |
4184 | ||
4185 | RFC 2222 states that SASL mechanism names contain only upper case | |
4186 | letters, so output the names in upper case, though we actually recognize | |
4187 | them in either case in the AUTH command. */ | |
4188 | ||
b3ef41c9 | 4189 | if ( auths |
16be7f11 | 4190 | #ifdef AUTH_TLS |
b3ef41c9 JH |
4191 | && !sender_host_authenticated |
4192 | #endif | |
4193 | && verify_check_host(&auth_advertise_hosts) == OK | |
4194 | ) | |
4195 | { | |
4196 | auth_instance *au; | |
4197 | BOOL first = TRUE; | |
4198 | for (au = auths; au; au = au->next) | |
4199 | if (au->server && (au->advertise_condition == NULL || | |
4200 | expand_check_condition(au->advertise_condition, au->name, | |
4201 | US"authenticator"))) | |
4202 | { | |
4203 | int saveptr; | |
4204 | if (first) | |
4205 | { | |
c2f669a4 JH |
4206 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
4207 | s = string_catn(s, &size, &ptr, US"-AUTH", 5); | |
b3ef41c9 JH |
4208 | first = FALSE; |
4209 | auth_advertised = TRUE; | |
4210 | } | |
4211 | saveptr = ptr; | |
c2f669a4 JH |
4212 | s = string_catn(s, &size, &ptr, US" ", 1); |
4213 | s = string_cat (s, &size, &ptr, au->public_name); | |
b3ef41c9 JH |
4214 | while (++saveptr < ptr) s[saveptr] = toupper(s[saveptr]); |
4215 | au->advertised = TRUE; | |
4216 | } | |
4217 | else | |
4218 | au->advertised = FALSE; | |
4219 | ||
c2f669a4 | 4220 | if (!first) s = string_catn(s, &size, &ptr, US"\r\n", 2); |
b3ef41c9 | 4221 | } |
059ec3d9 | 4222 | |
18481de3 | 4223 | /* RFC 3030 CHUNKING */ |
059ec3d9 | 4224 | |
aa368db3 JH |
4225 | if (verify_check_host(&chunking_advertise_hosts) != FAIL) |
4226 | { | |
4227 | s = string_catn(s, &size, &ptr, smtp_code, 3); | |
4228 | s = string_catn(s, &size, &ptr, US"-CHUNKING\r\n", 11); | |
7e3ce68e | 4229 | chunking_offered = TRUE; |
18481de3 | 4230 | chunking_state = CHUNKING_OFFERED; |
aa368db3 JH |
4231 | } |
4232 | ||
18481de3 JH |
4233 | /* Advertise TLS (Transport Level Security) aka SSL (Secure Socket Layer) |
4234 | if it has been included in the binary, and the host matches | |
4235 | tls_advertise_hosts. We must *not* advertise if we are already in a | |
4236 | secure connection. */ | |
4237 | ||
d1a13eea | 4238 | #ifdef SUPPORT_TLS |
817d9f57 | 4239 | if (tls_in.active < 0 && |
059ec3d9 PH |
4240 | verify_check_host(&tls_advertise_hosts) != FAIL) |
4241 | { | |
c2f669a4 JH |
4242 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
4243 | s = string_catn(s, &size, &ptr, US"-STARTTLS\r\n", 11); | |
059ec3d9 PH |
4244 | tls_advertised = TRUE; |
4245 | } | |
d1a13eea | 4246 | #endif |
059ec3d9 | 4247 | |
d1a13eea | 4248 | #ifndef DISABLE_PRDR |
fd98a5c6 | 4249 | /* Per Recipient Data Response, draft by Eric A. Hall extending RFC */ |
8ccd00b1 JH |
4250 | if (prdr_enable) |
4251 | { | |
c2f669a4 JH |
4252 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
4253 | s = string_catn(s, &size, &ptr, US"-PRDR\r\n", 7); | |
8ccd00b1 | 4254 | } |
d1a13eea JH |
4255 | #endif |
4256 | ||
8c5d388a | 4257 | #ifdef SUPPORT_I18N |
d1a13eea JH |
4258 | if ( accept_8bitmime |
4259 | && verify_check_host(&smtputf8_advertise_hosts) != FAIL) | |
4260 | { | |
c2f669a4 JH |
4261 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
4262 | s = string_catn(s, &size, &ptr, US"-SMTPUTF8\r\n", 11); | |
d1a13eea JH |
4263 | smtputf8_advertised = TRUE; |
4264 | } | |
4265 | #endif | |
fd98a5c6 | 4266 | |
059ec3d9 PH |
4267 | /* Finish off the multiline reply with one that is always available. */ |
4268 | ||
c2f669a4 JH |
4269 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
4270 | s = string_catn(s, &size, &ptr, US" HELP\r\n", 7); | |
059ec3d9 PH |
4271 | } |
4272 | ||
4273 | /* Terminate the string (for debug), write it, and note that HELO/EHLO | |
4274 | has been seen. */ | |
4275 | ||
4276 | s[ptr] = 0; | |
4277 | ||
d1a13eea | 4278 | #ifdef SUPPORT_TLS |
817d9f57 | 4279 | if (tls_in.active >= 0) (void)tls_write(TRUE, s, ptr); else |
d1a13eea | 4280 | #endif |
059ec3d9 | 4281 | |
1ac6b2e7 JH |
4282 | { |
4283 | int i = fwrite(s, 1, ptr, smtp_out); i = i; /* compiler quietening */ | |
4284 | } | |
898d150f PH |
4285 | DEBUG(D_receive) |
4286 | { | |
4287 | uschar *cr; | |
4288 | while ((cr = Ustrchr(s, '\r')) != NULL) /* lose CRs */ | |
4289 | memmove(cr, cr + 1, (ptr--) - (cr - s)); | |
4290 | debug_printf("SMTP>> %s", s); | |
4291 | } | |
059ec3d9 | 4292 | helo_seen = TRUE; |
4e88a19f PH |
4293 | |
4294 | /* Reset the protocol and the state, abandoning any previous message. */ | |
e524074d JH |
4295 | received_protocol = |
4296 | (sender_host_address ? protocols : protocols_local) | |
4297 | [ (esmtp | |
4298 | ? pextend + (sender_host_authenticated ? pauthed : 0) | |
4299 | : pnormal) | |
4300 | + (tls_in.active >= 0 ? pcrpted : 0) | |
4301 | ]; | |
57cc2785 | 4302 | cancel_cutthrough_connection(TRUE, US"sent EHLO response"); |
4e88a19f PH |
4303 | smtp_reset(reset_point); |
4304 | toomany = FALSE; | |
059ec3d9 PH |
4305 | break; /* HELO/EHLO */ |
4306 | ||
4307 | ||
4308 | /* The MAIL command requires an address as an operand. All we do | |
4309 | here is to parse it for syntactic correctness. The form "<>" is | |
4310 | a special case which converts into an empty string. The start/end | |
4311 | pointers in the original are not used further for this address, as | |
4312 | it is the canonical extracted address which is all that is kept. */ | |
4313 | ||
4314 | case MAIL_CMD: | |
b4ed4da0 | 4315 | HAD(SCH_MAIL); |
059ec3d9 PH |
4316 | smtp_mailcmd_count++; /* Count for limit and ratelimit */ |
4317 | was_rej_mail = TRUE; /* Reset if accepted */ | |
d27f98fe | 4318 | env_mail_type_t * mail_args; /* Sanity check & validate args */ |
059ec3d9 PH |
4319 | |
4320 | if (helo_required && !helo_seen) | |
4321 | { | |
4322 | smtp_printf("503 HELO or EHLO required\r\n"); | |
4323 | log_write(0, LOG_MAIN|LOG_REJECT, "rejected MAIL from %s: no " | |
4324 | "HELO/EHLO given", host_and_ident(FALSE)); | |
4325 | break; | |
4326 | } | |
4327 | ||
4328 | if (sender_address != NULL) | |
4329 | { | |
4330 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
4331 | US"sender already given"); | |
4332 | break; | |
4333 | } | |
4334 | ||
ca86f471 | 4335 | if (smtp_cmd_data[0] == 0) |
059ec3d9 PH |
4336 | { |
4337 | done = synprot_error(L_smtp_protocol_error, 501, NULL, | |
4338 | US"MAIL must have an address operand"); | |
4339 | break; | |
4340 | } | |
4341 | ||
4342 | /* Check to see if the limit for messages per connection would be | |
4343 | exceeded by accepting further messages. */ | |
4344 | ||
4345 | if (smtp_accept_max_per_connection > 0 && | |
4346 | smtp_mailcmd_count > smtp_accept_max_per_connection) | |
4347 | { | |
4348 | smtp_printf("421 too many messages in this connection\r\n"); | |
4349 | log_write(0, LOG_MAIN|LOG_REJECT, "rejected MAIL command %s: too many " | |
4350 | "messages in one connection", host_and_ident(TRUE)); | |
4351 | break; | |
4352 | } | |
4353 | ||
4354 | /* Reset for start of message - even if this is going to fail, we | |
4355 | obviously need to throw away any previous data. */ | |
4356 | ||
57cc2785 | 4357 | cancel_cutthrough_connection(TRUE, US"MAIL received"); |
059ec3d9 PH |
4358 | smtp_reset(reset_point); |
4359 | toomany = FALSE; | |
4360 | sender_data = recipient_data = NULL; | |
4361 | ||
4362 | /* Loop, checking for ESMTP additions to the MAIL FROM command. */ | |
4363 | ||
4364 | if (esmtp) for(;;) | |
4365 | { | |
4366 | uschar *name, *value, *end; | |
4367 | unsigned long int size; | |
d27f98fe | 4368 | BOOL arg_error = FALSE; |
059ec3d9 PH |
4369 | |
4370 | if (!extract_option(&name, &value)) break; | |
4371 | ||
d27f98fe | 4372 | for (mail_args = env_mail_type_list; |
2ef7ed08 | 4373 | mail_args->value != ENV_MAIL_OPT_NULL; |
d27f98fe TL |
4374 | mail_args++ |
4375 | ) | |
d27f98fe TL |
4376 | if (strcmpic(name, mail_args->name) == 0) |
4377 | break; | |
d27f98fe TL |
4378 | if (mail_args->need_value && strcmpic(value, US"") == 0) |
4379 | break; | |
059ec3d9 | 4380 | |
d27f98fe | 4381 | switch(mail_args->value) |
059ec3d9 | 4382 | { |
d27f98fe TL |
4383 | /* Handle SIZE= by reading the value. We don't do the check till later, |
4384 | in order to be able to log the sender address on failure. */ | |
4385 | case ENV_MAIL_OPT_SIZE: | |
d27f98fe | 4386 | if (((size = Ustrtoul(value, &end, 10)), *end == 0)) |
059ec3d9 | 4387 | { |
d27f98fe TL |
4388 | if ((size == ULONG_MAX && errno == ERANGE) || size > INT_MAX) |
4389 | size = INT_MAX; | |
4390 | message_size = (int)size; | |
059ec3d9 PH |
4391 | } |
4392 | else | |
d27f98fe TL |
4393 | arg_error = TRUE; |
4394 | break; | |
059ec3d9 | 4395 | |
d27f98fe TL |
4396 | /* If this session was initiated with EHLO and accept_8bitmime is set, |
4397 | Exim will have indicated that it supports the BODY=8BITMIME option. In | |
4398 | fact, it does not support this according to the RFCs, in that it does not | |
4399 | take any special action for forwarding messages containing 8-bit | |
4400 | characters. That is why accept_8bitmime is not the default setting, but | |
4401 | some sites want the action that is provided. We recognize both "8BITMIME" | |
4402 | and "7BIT" as body types, but take no action. */ | |
4403 | case ENV_MAIL_OPT_BODY: | |
3c0a92dc | 4404 | if (accept_8bitmime) { |
9d4319df | 4405 | if (strcmpic(value, US"8BITMIME") == 0) |
3c0a92dc | 4406 | body_8bitmime = 8; |
9d4319df | 4407 | else if (strcmpic(value, US"7BIT") == 0) |
3c0a92dc | 4408 | body_8bitmime = 7; |
9d4319df JH |
4409 | else |
4410 | { | |
3c0a92dc JH |
4411 | body_8bitmime = 0; |
4412 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4413 | US"invalid data for BODY"); | |
4414 | goto COMMAND_LOOP; | |
9d4319df | 4415 | } |
3c0a92dc JH |
4416 | DEBUG(D_receive) debug_printf("8BITMIME: %d\n", body_8bitmime); |
4417 | break; | |
4418 | } | |
d27f98fe TL |
4419 | arg_error = TRUE; |
4420 | break; | |
059ec3d9 | 4421 | |
6c1c3d1d WB |
4422 | /* Handle the two DSN options, but only if configured to do so (which |
4423 | will have caused "DSN" to be given in the EHLO response). The code itself | |
4424 | is included only if configured in at build time. */ | |
4425 | ||
4426 | case ENV_MAIL_OPT_RET: | |
9d4319df JH |
4427 | if (dsn_advertised) |
4428 | { | |
6c1c3d1d | 4429 | /* Check if RET has already been set */ |
9d4319df JH |
4430 | if (dsn_ret > 0) |
4431 | { | |
6c1c3d1d WB |
4432 | synprot_error(L_smtp_syntax_error, 501, NULL, |
4433 | US"RET can be specified once only"); | |
4434 | goto COMMAND_LOOP; | |
9d4319df JH |
4435 | } |
4436 | dsn_ret = strcmpic(value, US"HDRS") == 0 | |
4437 | ? dsn_ret_hdrs | |
4438 | : strcmpic(value, US"FULL") == 0 | |
4439 | ? dsn_ret_full | |
4440 | : 0; | |
6c1c3d1d WB |
4441 | DEBUG(D_receive) debug_printf("DSN_RET: %d\n", dsn_ret); |
4442 | /* Check for invalid invalid value, and exit with error */ | |
9d4319df JH |
4443 | if (dsn_ret == 0) |
4444 | { | |
6c1c3d1d WB |
4445 | synprot_error(L_smtp_syntax_error, 501, NULL, |
4446 | US"Value for RET is invalid"); | |
4447 | goto COMMAND_LOOP; | |
9d4319df JH |
4448 | } |
4449 | } | |
6c1c3d1d WB |
4450 | break; |
4451 | case ENV_MAIL_OPT_ENVID: | |
9d4319df JH |
4452 | if (dsn_advertised) |
4453 | { | |
6c1c3d1d | 4454 | /* Check if the dsn envid has been already set */ |
9d4319df JH |
4455 | if (dsn_envid != NULL) |
4456 | { | |
6c1c3d1d WB |
4457 | synprot_error(L_smtp_syntax_error, 501, NULL, |
4458 | US"ENVID can be specified once only"); | |
4459 | goto COMMAND_LOOP; | |
9d4319df | 4460 | } |
6c1c3d1d WB |
4461 | dsn_envid = string_copy(value); |
4462 | DEBUG(D_receive) debug_printf("DSN_ENVID: %s\n", dsn_envid); | |
9d4319df | 4463 | } |
6c1c3d1d | 4464 | break; |
6c1c3d1d | 4465 | |
d27f98fe TL |
4466 | /* Handle the AUTH extension. If the value given is not "<>" and either |
4467 | the ACL says "yes" or there is no ACL but the sending host is | |
4468 | authenticated, we set it up as the authenticated sender. However, if the | |
4469 | authenticator set a condition to be tested, we ignore AUTH on MAIL unless | |
4470 | the condition is met. The value of AUTH is an xtext, which means that +, | |
4471 | = and cntrl chars are coded in hex; however "<>" is unaffected by this | |
4472 | coding. */ | |
4473 | case ENV_MAIL_OPT_AUTH: | |
4474 | if (Ustrcmp(value, "<>") != 0) | |
4475 | { | |
4476 | int rc; | |
4477 | uschar *ignore_msg; | |
059ec3d9 | 4478 | |
d27f98fe TL |
4479 | if (auth_xtextdecode(value, &authenticated_sender) < 0) |
4480 | { | |
4481 | /* Put back terminator overrides for error message */ | |
d27f98fe | 4482 | value[-1] = '='; |
fd98a5c6 | 4483 | name[-1] = ' '; |
d27f98fe TL |
4484 | done = synprot_error(L_smtp_syntax_error, 501, NULL, |
4485 | US"invalid data for AUTH"); | |
4486 | goto COMMAND_LOOP; | |
4487 | } | |
4488 | if (acl_smtp_mailauth == NULL) | |
4489 | { | |
4490 | ignore_msg = US"client not authenticated"; | |
4491 | rc = (sender_host_authenticated != NULL)? OK : FAIL; | |
4492 | } | |
4493 | else | |
4494 | { | |
4495 | ignore_msg = US"rejected by ACL"; | |
4496 | rc = acl_check(ACL_WHERE_MAILAUTH, NULL, acl_smtp_mailauth, | |
4497 | &user_msg, &log_msg); | |
4498 | } | |
94431adb | 4499 | |
d27f98fe TL |
4500 | switch (rc) |
4501 | { | |
4502 | case OK: | |
9d4319df JH |
4503 | if (authenticated_by == NULL || |
4504 | authenticated_by->mail_auth_condition == NULL || | |
4505 | expand_check_condition(authenticated_by->mail_auth_condition, | |
4506 | authenticated_by->name, US"authenticator")) | |
4507 | break; /* Accept the AUTH */ | |
94431adb | 4508 | |
9d4319df JH |
4509 | ignore_msg = US"server_mail_auth_condition failed"; |
4510 | if (authenticated_id != NULL) | |
4511 | ignore_msg = string_sprintf("%s: authenticated ID=\"%s\"", | |
4512 | ignore_msg, authenticated_id); | |
94431adb | 4513 | |
d27f98fe | 4514 | /* Fall through */ |
94431adb | 4515 | |
d27f98fe | 4516 | case FAIL: |
9d4319df JH |
4517 | authenticated_sender = NULL; |
4518 | log_write(0, LOG_MAIN, "ignoring AUTH=%s from %s (%s)", | |
4519 | value, host_and_ident(TRUE), ignore_msg); | |
4520 | break; | |
94431adb | 4521 | |
d27f98fe TL |
4522 | /* Should only get DEFER or ERROR here. Put back terminator |
4523 | overrides for error message */ | |
94431adb | 4524 | |
d27f98fe | 4525 | default: |
9d4319df JH |
4526 | value[-1] = '='; |
4527 | name[-1] = ' '; | |
4528 | (void)smtp_handle_acl_fail(ACL_WHERE_MAILAUTH, rc, user_msg, | |
4529 | log_msg); | |
4530 | goto COMMAND_LOOP; | |
d27f98fe | 4531 | } |
059ec3d9 | 4532 | } |
d27f98fe | 4533 | break; |
fd98a5c6 | 4534 | |
8ccd00b1 | 4535 | #ifndef DISABLE_PRDR |
fd98a5c6 | 4536 | case ENV_MAIL_OPT_PRDR: |
8ccd00b1 | 4537 | if (prdr_enable) |
fd98a5c6 JH |
4538 | prdr_requested = TRUE; |
4539 | break; | |
4540 | #endif | |
4541 | ||
8c5d388a | 4542 | #ifdef SUPPORT_I18N |
d1a13eea JH |
4543 | case ENV_MAIL_OPT_UTF8: |
4544 | if (smtputf8_advertised) | |
e524074d | 4545 | { |
90341c71 JH |
4546 | int old_pool = store_pool; |
4547 | ||
e524074d | 4548 | DEBUG(D_receive) debug_printf("smtputf8 requested\n"); |
9d4319df | 4549 | message_smtputf8 = allow_utf8_domains = TRUE; |
90341c71 | 4550 | store_pool = POOL_PERM; |
5a886ce7 | 4551 | received_protocol = string_sprintf("utf8%s", received_protocol); |
90341c71 | 4552 | store_pool = old_pool; |
e524074d | 4553 | } |
d1a13eea JH |
4554 | break; |
4555 | #endif | |
2ef7ed08 | 4556 | /* No valid option. Stick back the terminator characters and break |
fd98a5c6 | 4557 | the loop. Do the name-terminator second as extract_option sets |
2ef7ed08 HSHR |
4558 | value==name when it found no equal-sign. |
4559 | An error for a malformed address will occur. */ | |
4560 | case ENV_MAIL_OPT_NULL: | |
d27f98fe | 4561 | value[-1] = '='; |
fd98a5c6 JH |
4562 | name[-1] = ' '; |
4563 | arg_error = TRUE; | |
d27f98fe | 4564 | break; |
2ef7ed08 HSHR |
4565 | |
4566 | default: assert(0); | |
059ec3d9 | 4567 | } |
d27f98fe TL |
4568 | /* Break out of for loop if switch() had bad argument or |
4569 | when start of the email address is reached */ | |
4570 | if (arg_error) break; | |
059ec3d9 PH |
4571 | } |
4572 | ||
4573 | /* If we have passed the threshold for rate limiting, apply the current | |
4574 | delay, and update it for next time, provided this is a limited host. */ | |
4575 | ||
4576 | if (smtp_mailcmd_count > smtp_rlm_threshold && | |
4577 | verify_check_host(&smtp_ratelimit_hosts) == OK) | |
4578 | { | |
4579 | DEBUG(D_receive) debug_printf("rate limit MAIL: delay %.3g sec\n", | |
4580 | smtp_delay_mail/1000.0); | |
4581 | millisleep((int)smtp_delay_mail); | |
4582 | smtp_delay_mail *= smtp_rlm_factor; | |
4583 | if (smtp_delay_mail > (double)smtp_rlm_limit) | |
4584 | smtp_delay_mail = (double)smtp_rlm_limit; | |
4585 | } | |
4586 | ||
4587 | /* Now extract the address, first applying any SMTP-time rewriting. The | |
4588 | TRUE flag allows "<>" as a sender address. */ | |
4589 | ||
9d4319df JH |
4590 | raw_sender = rewrite_existflags & rewrite_smtp |
4591 | ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"", | |
4592 | global_rewrite_rules) | |
4593 | : smtp_cmd_data; | |
059ec3d9 | 4594 | |
059ec3d9 PH |
4595 | raw_sender = |
4596 | parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain, | |
4597 | TRUE); | |
059ec3d9 | 4598 | |
2685d6e0 | 4599 | if (!raw_sender) |
059ec3d9 | 4600 | { |
ca86f471 | 4601 | done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess); |
059ec3d9 PH |
4602 | break; |
4603 | } | |
4604 | ||
4605 | sender_address = raw_sender; | |
4606 | ||
4607 | /* If there is a configured size limit for mail, check that this message | |
4608 | doesn't exceed it. The check is postponed to this point so that the sender | |
4609 | can be logged. */ | |
4610 | ||
4611 | if (thismessage_size_limit > 0 && message_size > thismessage_size_limit) | |
4612 | { | |
4613 | smtp_printf("552 Message size exceeds maximum permitted\r\n"); | |
4614 | log_write(L_size_reject, | |
4615 | LOG_MAIN|LOG_REJECT, "rejected MAIL FROM:<%s> %s: " | |
4616 | "message too big: size%s=%d max=%d", | |
4617 | sender_address, | |
4618 | host_and_ident(TRUE), | |
4619 | (message_size == INT_MAX)? ">" : "", | |
4620 | message_size, | |
4621 | thismessage_size_limit); | |
4622 | sender_address = NULL; | |
4623 | break; | |
4624 | } | |
4625 | ||
4626 | /* Check there is enough space on the disk unless configured not to. | |
4627 | When smtp_check_spool_space is set, the check is for thismessage_size_limit | |
4628 | plus the current message - i.e. we accept the message only if it won't | |
4629 | reduce the space below the threshold. Add 5000 to the size to allow for | |
4630 | overheads such as the Received: line and storing of recipients, etc. | |
4631 | By putting the check here, even when SIZE is not given, it allow VRFY | |
4632 | and EXPN etc. to be used when space is short. */ | |
4633 | ||
4634 | if (!receive_check_fs( | |
4635 | (smtp_check_spool_space && message_size >= 0)? | |
4636 | message_size + 5000 : 0)) | |
4637 | { | |
4638 | smtp_printf("452 Space shortage, please try later\r\n"); | |
4639 | sender_address = NULL; | |
4640 | break; | |
4641 | } | |
4642 | ||
4643 | /* If sender_address is unqualified, reject it, unless this is a locally | |
4644 | generated message, or the sending host or net is permitted to send | |
4645 | unqualified addresses - typically local machines behaving as MUAs - | |
4646 | in which case just qualify the address. The flag is set above at the start | |
4647 | of the SMTP connection. */ | |
4648 | ||
4649 | if (sender_domain == 0 && sender_address[0] != 0) | |
4650 | { | |
4651 | if (allow_unqualified_sender) | |
4652 | { | |
4653 | sender_domain = Ustrlen(sender_address) + 1; | |
4654 | sender_address = rewrite_address_qualify(sender_address, FALSE); | |
4655 | DEBUG(D_receive) debug_printf("unqualified address %s accepted\n", | |
4656 | raw_sender); | |
4657 | } | |
4658 | else | |
4659 | { | |
4660 | smtp_printf("501 %s: sender address must contain a domain\r\n", | |
ca86f471 | 4661 | smtp_cmd_data); |
059ec3d9 PH |
4662 | log_write(L_smtp_syntax_error, |
4663 | LOG_MAIN|LOG_REJECT, | |
4664 | "unqualified sender rejected: <%s> %s%s", | |
4665 | raw_sender, | |
4666 | host_and_ident(TRUE), | |
4667 | host_lookup_msg); | |
4668 | sender_address = NULL; | |
4669 | break; | |
4670 | } | |
4671 | } | |
4672 | ||
a14e5636 PH |
4673 | /* Apply an ACL check if one is defined, before responding. Afterwards, |
4674 | when pipelining is not advertised, do another sync check in case the ACL | |
4675 | delayed and the client started sending in the meantime. */ | |
059ec3d9 | 4676 | |
8ccd00b1 | 4677 | if (acl_smtp_mail) |
a14e5636 PH |
4678 | { |
4679 | rc = acl_check(ACL_WHERE_MAIL, NULL, acl_smtp_mail, &user_msg, &log_msg); | |
4680 | if (rc == OK && !pipelining_advertised && !check_sync()) | |
4681 | goto SYNC_FAILURE; | |
4682 | } | |
8ccd00b1 JH |
4683 | else |
4684 | rc = OK; | |
059ec3d9 PH |
4685 | |
4686 | if (rc == OK || rc == DISCARD) | |
4687 | { | |
8ccd00b1 | 4688 | if (!user_msg) |
fd98a5c6 | 4689 | smtp_printf("%s%s%s", US"250 OK", |
8ccd00b1 JH |
4690 | #ifndef DISABLE_PRDR |
4691 | prdr_requested ? US", PRDR Requested" : US"", | |
4692 | #else | |
fd98a5c6 | 4693 | US"", |
8ccd00b1 | 4694 | #endif |
fd98a5c6 | 4695 | US"\r\n"); |
94431adb | 4696 | else |
fd98a5c6 | 4697 | { |
8ccd00b1 JH |
4698 | #ifndef DISABLE_PRDR |
4699 | if (prdr_requested) | |
fd98a5c6 JH |
4700 | user_msg = string_sprintf("%s%s", user_msg, US", PRDR Requested"); |
4701 | #endif | |
8ccd00b1 | 4702 | smtp_user_msg(US"250", user_msg); |
fd98a5c6 | 4703 | } |
059ec3d9 PH |
4704 | smtp_delay_rcpt = smtp_rlr_base; |
4705 | recipients_discarded = (rc == DISCARD); | |
4706 | was_rej_mail = FALSE; | |
4707 | } | |
059ec3d9 PH |
4708 | else |
4709 | { | |
4710 | done = smtp_handle_acl_fail(ACL_WHERE_MAIL, rc, user_msg, log_msg); | |
4711 | sender_address = NULL; | |
4712 | } | |
4713 | break; | |
4714 | ||
4715 | ||
2679d413 PH |
4716 | /* The RCPT command requires an address as an operand. There may be any |
4717 | number of RCPT commands, specifying multiple recipients. We build them all | |
4718 | into a data structure. The start/end values given by parse_extract_address | |
4719 | are not used, as we keep only the extracted address. */ | |
059ec3d9 PH |
4720 | |
4721 | case RCPT_CMD: | |
b4ed4da0 | 4722 | HAD(SCH_RCPT); |
059ec3d9 | 4723 | rcpt_count++; |
2679d413 | 4724 | was_rcpt = rcpt_in_progress = TRUE; |
059ec3d9 PH |
4725 | |
4726 | /* There must be a sender address; if the sender was rejected and | |
4727 | pipelining was advertised, we assume the client was pipelining, and do not | |
4728 | count this as a protocol error. Reset was_rej_mail so that further RCPTs | |
4729 | get the same treatment. */ | |
4730 | ||
4731 | if (sender_address == NULL) | |
4732 | { | |
4733 | if (pipelining_advertised && last_was_rej_mail) | |
4734 | { | |
4735 | smtp_printf("503 sender not yet given\r\n"); | |
4736 | was_rej_mail = TRUE; | |
4737 | } | |
4738 | else | |
4739 | { | |
4740 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
4741 | US"sender not yet given"); | |
4742 | was_rcpt = FALSE; /* Not a valid RCPT */ | |
4743 | } | |
4744 | rcpt_fail_count++; | |
4745 | break; | |
4746 | } | |
4747 | ||
4748 | /* Check for an operand */ | |
4749 | ||
ca86f471 | 4750 | if (smtp_cmd_data[0] == 0) |
059ec3d9 PH |
4751 | { |
4752 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4753 | US"RCPT must have an address operand"); | |
4754 | rcpt_fail_count++; | |
4755 | break; | |
4756 | } | |
50dc7409 | 4757 | |
6c1c3d1d WB |
4758 | /* Set the DSN flags orcpt and dsn_flags from the session*/ |
4759 | orcpt = NULL; | |
4760 | flags = 0; | |
4761 | ||
4762 | if (esmtp) for(;;) | |
4763 | { | |
45500060 | 4764 | uschar *name, *value; |
6c1c3d1d WB |
4765 | |
4766 | if (!extract_option(&name, &value)) | |
6c1c3d1d | 4767 | break; |
6c1c3d1d WB |
4768 | |
4769 | if (dsn_advertised && strcmpic(name, US"ORCPT") == 0) | |
4770 | { | |
4771 | /* Check whether orcpt has been already set */ | |
45500060 JH |
4772 | if (orcpt) |
4773 | { | |
6c1c3d1d WB |
4774 | synprot_error(L_smtp_syntax_error, 501, NULL, |
4775 | US"ORCPT can be specified once only"); | |
4776 | goto COMMAND_LOOP; | |
4777 | } | |
4778 | orcpt = string_copy(value); | |
4779 | DEBUG(D_receive) debug_printf("DSN orcpt: %s\n", orcpt); | |
4780 | } | |
4781 | ||
4782 | else if (dsn_advertised && strcmpic(name, US"NOTIFY") == 0) | |
4783 | { | |
4784 | /* Check if the notify flags have been already set */ | |
45500060 JH |
4785 | if (flags > 0) |
4786 | { | |
6c1c3d1d WB |
4787 | synprot_error(L_smtp_syntax_error, 501, NULL, |
4788 | US"NOTIFY can be specified once only"); | |
4789 | goto COMMAND_LOOP; | |
4790 | } | |
45500060 JH |
4791 | if (strcmpic(value, US"NEVER") == 0) |
4792 | flags |= rf_notify_never; | |
4793 | else | |
6c1c3d1d WB |
4794 | { |
4795 | uschar *p = value; | |
4796 | while (*p != 0) | |
4797 | { | |
4798 | uschar *pp = p; | |
4799 | while (*pp != 0 && *pp != ',') pp++; | |
45500060 JH |
4800 | if (*pp == ',') *pp++ = 0; |
4801 | if (strcmpic(p, US"SUCCESS") == 0) | |
4802 | { | |
4803 | DEBUG(D_receive) debug_printf("DSN: Setting notify success\n"); | |
4804 | flags |= rf_notify_success; | |
6c1c3d1d | 4805 | } |
45500060 JH |
4806 | else if (strcmpic(p, US"FAILURE") == 0) |
4807 | { | |
4808 | DEBUG(D_receive) debug_printf("DSN: Setting notify failure\n"); | |
4809 | flags |= rf_notify_failure; | |
6c1c3d1d | 4810 | } |
45500060 JH |
4811 | else if (strcmpic(p, US"DELAY") == 0) |
4812 | { | |
4813 | DEBUG(D_receive) debug_printf("DSN: Setting notify delay\n"); | |
4814 | flags |= rf_notify_delay; | |
6c1c3d1d | 4815 | } |
45500060 JH |
4816 | else |
4817 | { | |
6c1c3d1d WB |
4818 | /* Catch any strange values */ |
4819 | synprot_error(L_smtp_syntax_error, 501, NULL, | |
4820 | US"Invalid value for NOTIFY parameter"); | |
4821 | goto COMMAND_LOOP; | |
4822 | } | |
4823 | p = pp; | |
4824 | } | |
4825 | DEBUG(D_receive) debug_printf("DSN Flags: %x\n", flags); | |
4826 | } | |
4827 | } | |
4828 | ||
4829 | /* Unknown option. Stick back the terminator characters and break | |
4830 | the loop. An error for a malformed address will occur. */ | |
4831 | ||
4832 | else | |
4833 | { | |
4834 | DEBUG(D_receive) debug_printf("Invalid RCPT option: %s : %s\n", name, value); | |
4835 | name[-1] = ' '; | |
4836 | value[-1] = '='; | |
4837 | break; | |
4838 | } | |
4839 | } | |
059ec3d9 PH |
4840 | |
4841 | /* Apply SMTP rewriting then extract the working address. Don't allow "<>" | |
4842 | as a recipient address */ | |
4843 | ||
05392bbc JH |
4844 | recipient = rewrite_existflags & rewrite_smtp |
4845 | ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"", | |
4846 | global_rewrite_rules) | |
4847 | : smtp_cmd_data; | |
059ec3d9 | 4848 | |
2685d6e0 JH |
4849 | if (!(recipient = parse_extract_address(recipient, &errmess, &start, &end, |
4850 | &recipient_domain, FALSE))) | |
059ec3d9 | 4851 | { |
ca86f471 | 4852 | done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess); |
059ec3d9 PH |
4853 | rcpt_fail_count++; |
4854 | break; | |
4855 | } | |
4856 | ||
4857 | /* If the recipient address is unqualified, reject it, unless this is a | |
4858 | locally generated message. However, unqualified addresses are permitted | |
4859 | from a configured list of hosts and nets - typically when behaving as | |
4860 | MUAs rather than MTAs. Sad that SMTP is used for both types of traffic, | |
4861 | really. The flag is set at the start of the SMTP connection. | |
4862 | ||
4863 | RFC 1123 talks about supporting "the reserved mailbox postmaster"; I always | |
4864 | assumed this meant "reserved local part", but the revision of RFC 821 and | |
4865 | friends now makes it absolutely clear that it means *mailbox*. Consequently | |
4866 | we must always qualify this address, regardless. */ | |
4867 | ||
c39b93a6 | 4868 | if (!recipient_domain) |
2685d6e0 JH |
4869 | if (!(recipient_domain = qualify_recipient(&recipient, smtp_cmd_data, |
4870 | US"recipient"))) | |
059ec3d9 PH |
4871 | { |
4872 | rcpt_fail_count++; | |
059ec3d9 PH |
4873 | break; |
4874 | } | |
059ec3d9 PH |
4875 | |
4876 | /* Check maximum allowed */ | |
4877 | ||
4878 | if (rcpt_count > recipients_max && recipients_max > 0) | |
4879 | { | |
4880 | if (recipients_max_reject) | |
4881 | { | |
4882 | rcpt_fail_count++; | |
4883 | smtp_printf("552 too many recipients\r\n"); | |
4884 | if (!toomany) | |
4885 | log_write(0, LOG_MAIN|LOG_REJECT, "too many recipients: message " | |
4886 | "rejected: sender=<%s> %s", sender_address, host_and_ident(TRUE)); | |
4887 | } | |
4888 | else | |
4889 | { | |
4890 | rcpt_defer_count++; | |
4891 | smtp_printf("452 too many recipients\r\n"); | |
4892 | if (!toomany) | |
4893 | log_write(0, LOG_MAIN|LOG_REJECT, "too many recipients: excess " | |
4894 | "temporarily rejected: sender=<%s> %s", sender_address, | |
4895 | host_and_ident(TRUE)); | |
4896 | } | |
4897 | ||
4898 | toomany = TRUE; | |
4899 | break; | |
4900 | } | |
4901 | ||
4902 | /* If we have passed the threshold for rate limiting, apply the current | |
4903 | delay, and update it for next time, provided this is a limited host. */ | |
4904 | ||
4905 | if (rcpt_count > smtp_rlr_threshold && | |
4906 | verify_check_host(&smtp_ratelimit_hosts) == OK) | |
4907 | { | |
4908 | DEBUG(D_receive) debug_printf("rate limit RCPT: delay %.3g sec\n", | |
4909 | smtp_delay_rcpt/1000.0); | |
4910 | millisleep((int)smtp_delay_rcpt); | |
4911 | smtp_delay_rcpt *= smtp_rlr_factor; | |
4912 | if (smtp_delay_rcpt > (double)smtp_rlr_limit) | |
4913 | smtp_delay_rcpt = (double)smtp_rlr_limit; | |
4914 | } | |
4915 | ||
4916 | /* If the MAIL ACL discarded all the recipients, we bypass ACL checking | |
a14e5636 PH |
4917 | for them. Otherwise, check the access control list for this recipient. As |
4918 | there may be a delay in this, re-check for a synchronization error | |
4919 | afterwards, unless pipelining was advertised. */ | |
059ec3d9 | 4920 | |
a23ff3b4 JH |
4921 | if (recipients_discarded) |
4922 | rc = DISCARD; | |
4923 | else | |
4924 | if ( (rc = acl_check(ACL_WHERE_RCPT, recipient, acl_smtp_rcpt, &user_msg, | |
4925 | &log_msg)) == OK | |
4926 | && !pipelining_advertised && !check_sync()) | |
a14e5636 | 4927 | goto SYNC_FAILURE; |
059ec3d9 PH |
4928 | |
4929 | /* The ACL was happy */ | |
4930 | ||
4931 | if (rc == OK) | |
4932 | { | |
a23ff3b4 JH |
4933 | if (user_msg) |
4934 | smtp_user_msg(US"250", user_msg); | |
4935 | else | |
4936 | smtp_printf("250 Accepted\r\n"); | |
059ec3d9 | 4937 | receive_add_recipient(recipient, -1); |
94431adb | 4938 | |
6c1c3d1d | 4939 | /* Set the dsn flags in the recipients_list */ |
7ade712c JH |
4940 | recipients_list[recipients_count-1].orcpt = orcpt; |
4941 | recipients_list[recipients_count-1].dsn_flags = flags; | |
6c1c3d1d | 4942 | |
7ade712c JH |
4943 | DEBUG(D_receive) debug_printf("DSN: orcpt: %s flags: %d\n", |
4944 | recipients_list[recipients_count-1].orcpt, | |
4945 | recipients_list[recipients_count-1].dsn_flags); | |
059ec3d9 PH |
4946 | } |
4947 | ||
4948 | /* The recipient was discarded */ | |
4949 | ||
4950 | else if (rc == DISCARD) | |
4951 | { | |
a23ff3b4 JH |
4952 | if (user_msg) |
4953 | smtp_user_msg(US"250", user_msg); | |
4954 | else | |
4955 | smtp_printf("250 Accepted\r\n"); | |
059ec3d9 PH |
4956 | rcpt_fail_count++; |
4957 | discarded = TRUE; | |
1f12df4d | 4958 | log_write(0, LOG_MAIN|LOG_REJECT, "%s F=<%s> RCPT %s: " |
059ec3d9 | 4959 | "discarded by %s ACL%s%s", host_and_ident(TRUE), |
1f12df4d | 4960 | sender_address_unrewritten? sender_address_unrewritten : sender_address, |
3ee512ff | 4961 | smtp_cmd_argument, recipients_discarded? "MAIL" : "RCPT", |
1f12df4d | 4962 | log_msg ? US": " : US"", log_msg ? log_msg : US""); |
059ec3d9 PH |
4963 | } |
4964 | ||
4965 | /* Either the ACL failed the address, or it was deferred. */ | |
4966 | ||
4967 | else | |
4968 | { | |
4969 | if (rc == FAIL) rcpt_fail_count++; else rcpt_defer_count++; | |
4970 | done = smtp_handle_acl_fail(ACL_WHERE_RCPT, rc, user_msg, log_msg); | |
4971 | } | |
4972 | break; | |
4973 | ||
4974 | ||
4975 | /* The DATA command is legal only if it follows successful MAIL FROM | |
4976 | and RCPT TO commands. However, if pipelining is advertised, a bad DATA is | |
4977 | not counted as a protocol error if it follows RCPT (which must have been | |
4978 | rejected if there are no recipients.) This function is complete when a | |
4979 | valid DATA command is encountered. | |
4980 | ||
4981 | Note concerning the code used: RFC 2821 says this: | |
4982 | ||
4983 | - If there was no MAIL, or no RCPT, command, or all such commands | |
4984 | were rejected, the server MAY return a "command out of sequence" | |
4985 | (503) or "no valid recipients" (554) reply in response to the | |
4986 | DATA command. | |
4987 | ||
4988 | The example in the pipelining RFC 2920 uses 554, but I use 503 here | |
2679d413 PH |
4989 | because it is the same whether pipelining is in use or not. |
4990 | ||
4991 | If all the RCPT commands that precede DATA provoked the same error message | |
4992 | (often indicating some kind of system error), it is helpful to include it | |
4993 | with the DATA rejection (an idea suggested by Tony Finch). */ | |
059ec3d9 | 4994 | |
18481de3 JH |
4995 | case BDAT_CMD: |
4996 | HAD(SCH_BDAT); | |
4997 | { | |
4998 | int n; | |
4999 | ||
5000 | if (chunking_state != CHUNKING_OFFERED) | |
5001 | { | |
5002 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
5003 | US"BDAT command used when CHUNKING not advertised"); | |
5004 | break; | |
5005 | } | |
5006 | ||
5007 | /* grab size, endmarker */ | |
5008 | ||
5009 | if (sscanf(CS smtp_cmd_data, "%u %n", &chunking_datasize, &n) < 1) | |
5010 | { | |
7e3ce68e | 5011 | done = synprot_error(L_smtp_protocol_error, 501, NULL, |
18481de3 JH |
5012 | US"missing size for BDAT command"); |
5013 | break; | |
5014 | } | |
5015 | chunking_state = strcmpic(smtp_cmd_data+n, US"LAST") == 0 | |
5016 | ? CHUNKING_LAST : CHUNKING_ACTIVE; | |
7e3ce68e | 5017 | chunking_data_left = chunking_datasize; |
bd8fbe36 JH |
5018 | DEBUG(D_receive) debug_printf("chunking state %d, %d bytes\n", |
5019 | (int)chunking_state, chunking_data_left); | |
7e3ce68e JH |
5020 | |
5021 | lwr_receive_getc = receive_getc; | |
0d81dabc | 5022 | lwr_receive_getbuf = receive_getbuf; |
7e3ce68e JH |
5023 | lwr_receive_ungetc = receive_ungetc; |
5024 | receive_getc = bdat_getc; | |
5025 | receive_ungetc = bdat_ungetc; | |
18481de3 | 5026 | |
18481de3 JH |
5027 | goto DATA_BDAT; |
5028 | } | |
5029 | ||
059ec3d9 | 5030 | case DATA_CMD: |
b4ed4da0 | 5031 | HAD(SCH_DATA); |
18481de3 JH |
5032 | |
5033 | DATA_BDAT: /* Common code for DATA and BDAT */ | |
059ec3d9 PH |
5034 | if (!discarded && recipients_count <= 0) |
5035 | { | |
2679d413 PH |
5036 | if (rcpt_smtp_response_same && rcpt_smtp_response != NULL) |
5037 | { | |
5038 | uschar *code = US"503"; | |
5039 | int len = Ustrlen(rcpt_smtp_response); | |
5040 | smtp_respond(code, 3, FALSE, US"All RCPT commands were rejected with " | |
5041 | "this error:"); | |
5042 | /* Responses from smtp_printf() will have \r\n on the end */ | |
5043 | if (len > 2 && rcpt_smtp_response[len-2] == '\r') | |
5044 | rcpt_smtp_response[len-2] = 0; | |
5045 | smtp_respond(code, 3, FALSE, rcpt_smtp_response); | |
5046 | } | |
059ec3d9 | 5047 | if (pipelining_advertised && last_was_rcpt) |
18481de3 JH |
5048 | smtp_printf("503 Valid RCPT command must precede %s\r\n", |
5049 | smtp_names[smtp_connection_had[smtp_ch_index-1]]); | |
059ec3d9 PH |
5050 | else |
5051 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
18481de3 JH |
5052 | smtp_connection_had[smtp_ch_index-1] == SCH_DATA |
5053 | ? US"valid RCPT command must precede DATA" | |
5054 | : US"valid RCPT command must precede BDAT"); | |
45bd315d JH |
5055 | |
5056 | if (chunking_state > CHUNKING_OFFERED) | |
5057 | bdat_flush_data(); | |
059ec3d9 PH |
5058 | break; |
5059 | } | |
5060 | ||
5061 | if (toomany && recipients_max_reject) | |
5062 | { | |
5063 | sender_address = NULL; /* This will allow a new MAIL without RSET */ | |
5064 | sender_address_unrewritten = NULL; | |
5065 | smtp_printf("554 Too many recipients\r\n"); | |
5066 | break; | |
5067 | } | |
8e669ac1 | 5068 | |
7e3ce68e | 5069 | if (chunking_state > CHUNKING_OFFERED) |
a23ff3b4 | 5070 | rc = OK; /* No predata ACL or go-ahead output for BDAT */ |
18481de3 | 5071 | else |
8e669ac1 | 5072 | { |
7e3ce68e JH |
5073 | /* If there is an ACL, re-check the synchronization afterwards, since the |
5074 | ACL may have delayed. To handle cutthrough delivery enforce a dummy call | |
5075 | to get the DATA command sent. */ | |
059ec3d9 | 5076 | |
7e3ce68e JH |
5077 | if (acl_smtp_predata == NULL && cutthrough.fd < 0) |
5078 | rc = OK; | |
5079 | else | |
5080 | { | |
5081 | uschar * acl = acl_smtp_predata ? acl_smtp_predata : US"accept"; | |
5082 | enable_dollar_recipients = TRUE; | |
5083 | rc = acl_check(ACL_WHERE_PREDATA, NULL, acl, &user_msg, | |
5084 | &log_msg); | |
5085 | enable_dollar_recipients = FALSE; | |
5086 | if (rc == OK && !check_sync()) | |
5087 | goto SYNC_FAILURE; | |
5088 | ||
5089 | if (rc != OK) | |
5090 | { /* Either the ACL failed the address, or it was deferred. */ | |
5091 | done = smtp_handle_acl_fail(ACL_WHERE_PREDATA, rc, user_msg, log_msg); | |
5092 | break; | |
5093 | } | |
5094 | } | |
5095 | ||
5096 | if (user_msg) | |
5097 | smtp_user_msg(US"354", user_msg); | |
5098 | else | |
5099 | smtp_printf( | |
5100 | "354 Enter message, ending with \".\" on a line by itself\r\n"); | |
059ec3d9 PH |
5101 | } |
5102 | ||
8d330698 JH |
5103 | #ifdef TCP_QUICKACK |
5104 | if (smtp_in) /* all ACKs needed to ramp window up for bulk data */ | |
5105 | (void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK, | |
5106 | US &on, sizeof(on)); | |
5107 | #endif | |
7e3ce68e JH |
5108 | done = 3; |
5109 | message_ended = END_NOTENDED; /* Indicate in middle of data */ | |
059ec3d9 | 5110 | |
059ec3d9 PH |
5111 | break; |
5112 | ||
5113 | ||
5114 | case VRFY_CMD: | |
059ec3d9 | 5115 | { |
4f6ae5c3 | 5116 | uschar * address; |
059ec3d9 | 5117 | |
4f6ae5c3 | 5118 | HAD(SCH_VRFY); |
059ec3d9 | 5119 | |
05392bbc JH |
5120 | if (!(address = parse_extract_address(smtp_cmd_data, &errmess, |
5121 | &start, &end, &recipient_domain, FALSE))) | |
5122 | { | |
4f6ae5c3 | 5123 | smtp_printf("501 %s\r\n", errmess); |
05392bbc JH |
5124 | break; |
5125 | } | |
5126 | ||
c39b93a6 | 5127 | if (!recipient_domain) |
2685d6e0 JH |
5128 | if (!(recipient_domain = qualify_recipient(&address, smtp_cmd_data, |
5129 | US"verify"))) | |
05392bbc | 5130 | break; |
4f6ae5c3 | 5131 | |
05392bbc | 5132 | if ((rc = acl_check(ACL_WHERE_VRFY, address, acl_smtp_vrfy, |
4f6ae5c3 JH |
5133 | &user_msg, &log_msg)) != OK) |
5134 | done = smtp_handle_acl_fail(ACL_WHERE_VRFY, rc, user_msg, log_msg); | |
059ec3d9 | 5135 | else |
4f6ae5c3 | 5136 | { |
05392bbc JH |
5137 | uschar * s = NULL; |
5138 | address_item * addr = deliver_make_addr(address, FALSE); | |
059ec3d9 | 5139 | |
4f6ae5c3 JH |
5140 | switch(verify_address(addr, NULL, vopt_is_recipient | vopt_qualify, -1, |
5141 | -1, -1, NULL, NULL, NULL)) | |
5142 | { | |
5143 | case OK: | |
5144 | s = string_sprintf("250 <%s> is deliverable", address); | |
5145 | break; | |
059ec3d9 | 5146 | |
4f6ae5c3 JH |
5147 | case DEFER: |
5148 | s = (addr->user_message != NULL)? | |
5149 | string_sprintf("451 <%s> %s", address, addr->user_message) : | |
5150 | string_sprintf("451 Cannot resolve <%s> at this time", address); | |
5151 | break; | |
059ec3d9 | 5152 | |
4f6ae5c3 JH |
5153 | case FAIL: |
5154 | s = (addr->user_message != NULL)? | |
5155 | string_sprintf("550 <%s> %s", address, addr->user_message) : | |
5156 | string_sprintf("550 <%s> is not deliverable", address); | |
5157 | log_write(0, LOG_MAIN, "VRFY failed for %s %s", | |
5158 | smtp_cmd_argument, host_and_ident(TRUE)); | |
5159 | break; | |
5160 | } | |
5161 | ||
5162 | smtp_printf("%s\r\n", s); | |
5163 | } | |
5164 | break; | |
059ec3d9 | 5165 | } |
059ec3d9 PH |
5166 | |
5167 | ||
5168 | case EXPN_CMD: | |
b4ed4da0 | 5169 | HAD(SCH_EXPN); |
64ffc24f | 5170 | rc = acl_check(ACL_WHERE_EXPN, NULL, acl_smtp_expn, &user_msg, &log_msg); |
059ec3d9 PH |
5171 | if (rc != OK) |
5172 | done = smtp_handle_acl_fail(ACL_WHERE_EXPN, rc, user_msg, log_msg); | |
5173 | else | |
5174 | { | |
5175 | BOOL save_log_testing_mode = log_testing_mode; | |
5176 | address_test_mode = log_testing_mode = TRUE; | |
ca86f471 | 5177 | (void) verify_address(deliver_make_addr(smtp_cmd_data, FALSE), |
64ffc24f PH |
5178 | smtp_out, vopt_is_recipient | vopt_qualify | vopt_expn, -1, -1, -1, |
5179 | NULL, NULL, NULL); | |
059ec3d9 PH |
5180 | address_test_mode = FALSE; |
5181 | log_testing_mode = save_log_testing_mode; /* true for -bh */ | |
5182 | } | |
5183 | break; | |
5184 | ||
5185 | ||
5186 | #ifdef SUPPORT_TLS | |
5187 | ||
5188 | case STARTTLS_CMD: | |
b4ed4da0 | 5189 | HAD(SCH_STARTTLS); |
059ec3d9 PH |
5190 | if (!tls_advertised) |
5191 | { | |
5192 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
5193 | US"STARTTLS command used when not advertised"); | |
5194 | break; | |
5195 | } | |
5196 | ||
5197 | /* Apply an ACL check if one is defined */ | |
5198 | ||
4f6ae5c3 JH |
5199 | if ( acl_smtp_starttls |
5200 | && (rc = acl_check(ACL_WHERE_STARTTLS, NULL, acl_smtp_starttls, | |
5201 | &user_msg, &log_msg)) != OK | |
5202 | ) | |
059ec3d9 | 5203 | { |
4f6ae5c3 JH |
5204 | done = smtp_handle_acl_fail(ACL_WHERE_STARTTLS, rc, user_msg, log_msg); |
5205 | break; | |
059ec3d9 PH |
5206 | } |
5207 | ||
5208 | /* RFC 2487 is not clear on when this command may be sent, though it | |
5209 | does state that all information previously obtained from the client | |
4c04137d | 5210 | must be discarded if a TLS session is started. It seems reasonable to |
059ec3d9 PH |
5211 | do an implied RSET when STARTTLS is received. */ |
5212 | ||
5213 | incomplete_transaction_log(US"STARTTLS"); | |
57cc2785 | 5214 | cancel_cutthrough_connection(TRUE, US"STARTTLS received"); |
059ec3d9 PH |
5215 | smtp_reset(reset_point); |
5216 | toomany = FALSE; | |
5217 | cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = FALSE; | |
5218 | ||
da80c2a8 PP |
5219 | /* There's an attack where more data is read in past the STARTTLS command |
5220 | before TLS is negotiated, then assumed to be part of the secure session | |
5221 | when used afterwards; we use segregated input buffers, so are not | |
5222 | vulnerable, but we want to note when it happens and, for sheer paranoia, | |
5223 | ensure that the buffer is "wiped". | |
5224 | Pipelining sync checks will normally have protected us too, unless disabled | |
5225 | by configuration. */ | |
5226 | ||
5227 | if (receive_smtp_buffered()) | |
5228 | { | |
5229 | DEBUG(D_any) | |
18481de3 | 5230 | debug_printf("Non-empty input buffer after STARTTLS; naive attack?\n"); |
817d9f57 | 5231 | if (tls_in.active < 0) |
da80c2a8 PP |
5232 | smtp_inend = smtp_inptr = smtp_inbuffer; |
5233 | /* and if TLS is already active, tls_server_start() should fail */ | |
5234 | } | |
5235 | ||
4c04137d | 5236 | /* There is nothing we value in the input buffer and if TLS is successfully |
4e7ee012 PP |
5237 | negotiated, we won't use this buffer again; if TLS fails, we'll just read |
5238 | fresh content into it. The buffer contains arbitrary content from an | |
5239 | untrusted remote source; eg: NOOP <shellcode>\r\nSTARTTLS\r\n | |
5240 | It seems safest to just wipe away the content rather than leave it as a | |
5241 | target to jump to. */ | |
5242 | ||
bd8fbe36 | 5243 | memset(smtp_inbuffer, 0, IN_BUFFER_SIZE); |
4e7ee012 | 5244 | |
059ec3d9 PH |
5245 | /* Attempt to start up a TLS session, and if successful, discard all |
5246 | knowledge that was obtained previously. At least, that's what the RFC says, | |
5247 | and that's what happens by default. However, in order to work round YAEB, | |
5248 | there is an option to remember the esmtp state. Sigh. | |
5249 | ||
5250 | We must allow for an extra EHLO command and an extra AUTH command after | |
5251 | STARTTLS that don't add to the nonmail command count. */ | |
5252 | ||
cf0c6164 JH |
5253 | s = NULL; |
5254 | if ((rc = tls_server_start(tls_require_ciphers, &s)) == OK) | |
059ec3d9 PH |
5255 | { |
5256 | if (!tls_remember_esmtp) | |
5257 | helo_seen = esmtp = auth_advertised = pipelining_advertised = FALSE; | |
5258 | cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE; | |
5259 | cmd_list[CMD_LIST_AUTH].is_mail_cmd = TRUE; | |
b3ef41c9 | 5260 | cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE; |
059ec3d9 PH |
5261 | if (sender_helo_name != NULL) |
5262 | { | |
5263 | store_free(sender_helo_name); | |
5264 | sender_helo_name = NULL; | |
5265 | host_build_sender_fullhost(); /* Rebuild */ | |
5266 | set_process_info("handling incoming TLS connection from %s", | |
5267 | host_and_ident(FALSE)); | |
5268 | } | |
e524074d JH |
5269 | received_protocol = |
5270 | (sender_host_address ? protocols : protocols_local) | |
5271 | [ (esmtp | |
5272 | ? pextend + (sender_host_authenticated ? pauthed : 0) | |
5273 | : pnormal) | |
5274 | + (tls_in.active >= 0 ? pcrpted : 0) | |
5275 | ]; | |
059ec3d9 PH |
5276 | |
5277 | sender_host_authenticated = NULL; | |
5278 | authenticated_id = NULL; | |
5279 | sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING; | |
5280 | DEBUG(D_tls) debug_printf("TLS active\n"); | |
5281 | break; /* Successful STARTTLS */ | |
5282 | } | |
cf0c6164 JH |
5283 | else |
5284 | (void) smtp_log_tls_fail(s); | |
059ec3d9 PH |
5285 | |
5286 | /* Some local configuration problem was discovered before actually trying | |
5287 | to do a TLS handshake; give a temporary error. */ | |
5288 | ||
cf0c6164 | 5289 | if (rc == DEFER) |
059ec3d9 PH |
5290 | { |
5291 | smtp_printf("454 TLS currently unavailable\r\n"); | |
5292 | break; | |
5293 | } | |
5294 | ||
5295 | /* Hard failure. Reject everything except QUIT or closed connection. One | |
817d9f57 | 5296 | cause for failure is a nested STARTTLS, in which case tls_in.active remains |
059ec3d9 PH |
5297 | set, but we must still reject all incoming commands. */ |
5298 | ||
5299 | DEBUG(D_tls) debug_printf("TLS failed to start\n"); | |
bd8fbe36 | 5300 | while (done <= 0) switch(smtp_read_command(FALSE, GETC_BUFFER_UNLIMITED)) |
059ec3d9 | 5301 | { |
60d10ce7 JH |
5302 | case EOF_CMD: |
5303 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by EOF", | |
5304 | smtp_get_connection_info()); | |
5305 | smtp_notquit_exit(US"tls-failed", NULL, NULL); | |
5306 | done = 2; | |
5307 | break; | |
8f128379 | 5308 | |
60d10ce7 JH |
5309 | /* It is perhaps arguable as to which exit ACL should be called here, |
5310 | but as it is probably a situation that almost never arises, it | |
5311 | probably doesn't matter. We choose to call the real QUIT ACL, which in | |
5312 | some sense is perhaps "right". */ | |
5313 | ||
5314 | case QUIT_CMD: | |
5315 | user_msg = NULL; | |
5316 | if ( acl_smtp_quit | |
5317 | && ((rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, &user_msg, | |
5318 | &log_msg)) == ERROR)) | |
5319 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s", | |
5320 | log_msg); | |
5321 | if (user_msg) | |
5322 | smtp_respond(US"221", 3, TRUE, user_msg); | |
5323 | else | |
5324 | smtp_printf("221 %s closing connection\r\n", smtp_active_hostname); | |
5325 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT", | |
5326 | smtp_get_connection_info()); | |
5327 | done = 2; | |
5328 | break; | |
059ec3d9 | 5329 | |
60d10ce7 JH |
5330 | default: |
5331 | smtp_printf("554 Security failure\r\n"); | |
5332 | break; | |
059ec3d9 | 5333 | } |
817d9f57 | 5334 | tls_close(TRUE, TRUE); |
059ec3d9 PH |
5335 | break; |
5336 | #endif | |
5337 | ||
5338 | ||
5339 | /* The ACL for QUIT is provided for gathering statistical information or | |
5340 | similar; it does not affect the response code, but it can supply a custom | |
5341 | message. */ | |
5342 | ||
5343 | case QUIT_CMD: | |
7e3ce68e | 5344 | smtp_quit_handler(&user_msg, &log_msg); |
059ec3d9 | 5345 | done = 2; |
059ec3d9 PH |
5346 | break; |
5347 | ||
5348 | ||
5349 | case RSET_CMD: | |
7e3ce68e | 5350 | smtp_rset_handler(); |
57cc2785 | 5351 | cancel_cutthrough_connection(TRUE, US"RSET received"); |
059ec3d9 PH |
5352 | smtp_reset(reset_point); |
5353 | toomany = FALSE; | |
059ec3d9 PH |
5354 | break; |
5355 | ||
5356 | ||
5357 | case NOOP_CMD: | |
b4ed4da0 | 5358 | HAD(SCH_NOOP); |
059ec3d9 PH |
5359 | smtp_printf("250 OK\r\n"); |
5360 | break; | |
5361 | ||
5362 | ||
b43a74ea PH |
5363 | /* Show ETRN/EXPN/VRFY if there's an ACL for checking hosts; if actually |
5364 | used, a check will be done for permitted hosts. Show STARTTLS only if not | |
5365 | already in a TLS session and if it would be advertised in the EHLO | |
5366 | response. */ | |
059ec3d9 PH |
5367 | |
5368 | case HELP_CMD: | |
b4ed4da0 | 5369 | HAD(SCH_HELP); |
059ec3d9 PH |
5370 | smtp_printf("214-Commands supported:\r\n"); |
5371 | { | |
5372 | uschar buffer[256]; | |
5373 | buffer[0] = 0; | |
5374 | Ustrcat(buffer, " AUTH"); | |
5375 | #ifdef SUPPORT_TLS | |
817d9f57 | 5376 | if (tls_in.active < 0 && |
b43a74ea PH |
5377 | verify_check_host(&tls_advertise_hosts) != FAIL) |
5378 | Ustrcat(buffer, " STARTTLS"); | |
059ec3d9 | 5379 | #endif |
7e3ce68e | 5380 | Ustrcat(buffer, " HELO EHLO MAIL RCPT DATA BDAT"); |
059ec3d9 PH |
5381 | Ustrcat(buffer, " NOOP QUIT RSET HELP"); |
5382 | if (acl_smtp_etrn != NULL) Ustrcat(buffer, " ETRN"); | |
5383 | if (acl_smtp_expn != NULL) Ustrcat(buffer, " EXPN"); | |
5384 | if (acl_smtp_vrfy != NULL) Ustrcat(buffer, " VRFY"); | |
5385 | smtp_printf("214%s\r\n", buffer); | |
5386 | } | |
5387 | break; | |
5388 | ||
5389 | ||
5390 | case EOF_CMD: | |
5391 | incomplete_transaction_log(US"connection lost"); | |
8f128379 PH |
5392 | smtp_notquit_exit(US"connection-lost", US"421", |
5393 | US"%s lost input connection", smtp_active_hostname); | |
059ec3d9 PH |
5394 | |
5395 | /* Don't log by default unless in the middle of a message, as some mailers | |
5396 | just drop the call rather than sending QUIT, and it clutters up the logs. | |
5397 | */ | |
5398 | ||
5399 | if (sender_address != NULL || recipients_count > 0) | |
5400 | log_write(L_lost_incoming_connection, | |
5401 | LOG_MAIN, | |
5402 | "unexpected %s while reading SMTP command from %s%s", | |
5403 | sender_host_unknown? "EOF" : "disconnection", | |
5404 | host_and_ident(FALSE), smtp_read_error); | |
5405 | ||
5406 | else log_write(L_smtp_connection, LOG_MAIN, "%s lost%s", | |
5407 | smtp_get_connection_info(), smtp_read_error); | |
5408 | ||
5409 | done = 1; | |
5410 | break; | |
5411 | ||
5412 | ||
5413 | case ETRN_CMD: | |
b4ed4da0 | 5414 | HAD(SCH_ETRN); |
059ec3d9 PH |
5415 | if (sender_address != NULL) |
5416 | { | |
5417 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
5418 | US"ETRN is not permitted inside a transaction"); | |
5419 | break; | |
5420 | } | |
5421 | ||
3ee512ff | 5422 | log_write(L_etrn, LOG_MAIN, "ETRN %s received from %s", smtp_cmd_argument, |
059ec3d9 PH |
5423 | host_and_ident(FALSE)); |
5424 | ||
4f6ae5c3 JH |
5425 | if ((rc = acl_check(ACL_WHERE_ETRN, NULL, acl_smtp_etrn, |
5426 | &user_msg, &log_msg)) != OK) | |
059ec3d9 PH |
5427 | { |
5428 | done = smtp_handle_acl_fail(ACL_WHERE_ETRN, rc, user_msg, log_msg); | |
5429 | break; | |
5430 | } | |
5431 | ||
5432 | /* Compute the serialization key for this command. */ | |
5433 | ||
ca86f471 | 5434 | etrn_serialize_key = string_sprintf("etrn-%s\n", smtp_cmd_data); |
059ec3d9 PH |
5435 | |
5436 | /* If a command has been specified for running as a result of ETRN, we | |
5437 | permit any argument to ETRN. If not, only the # standard form is permitted, | |
5438 | since that is strictly the only kind of ETRN that can be implemented | |
5439 | according to the RFC. */ | |
5440 | ||
5441 | if (smtp_etrn_command != NULL) | |
5442 | { | |
5443 | uschar *error; | |
5444 | BOOL rc; | |
5445 | etrn_command = smtp_etrn_command; | |
ca86f471 | 5446 | deliver_domain = smtp_cmd_data; |
059ec3d9 PH |
5447 | rc = transport_set_up_command(&argv, smtp_etrn_command, TRUE, 0, NULL, |
5448 | US"ETRN processing", &error); | |
5449 | deliver_domain = NULL; | |
5450 | if (!rc) | |
5451 | { | |
5452 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to set up ETRN command: %s", | |
5453 | error); | |
5454 | smtp_printf("458 Internal failure\r\n"); | |
5455 | break; | |
5456 | } | |
5457 | } | |
5458 | ||
5459 | /* Else set up to call Exim with the -R option. */ | |
5460 | ||
5461 | else | |
5462 | { | |
ca86f471 | 5463 | if (*smtp_cmd_data++ != '#') |
059ec3d9 PH |
5464 | { |
5465 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
5466 | US"argument must begin with #"); | |
5467 | break; | |
5468 | } | |
5469 | etrn_command = US"exim -R"; | |
e37f8a84 JH |
5470 | argv = CUSS child_exec_exim(CEE_RETURN_ARGV, TRUE, NULL, TRUE, |
5471 | *queue_name ? 4 : 2, | |
5472 | US"-R", smtp_cmd_data, | |
5473 | US"-MCG", queue_name); | |
059ec3d9 PH |
5474 | } |
5475 | ||
5476 | /* If we are host-testing, don't actually do anything. */ | |
5477 | ||
5478 | if (host_checking) | |
5479 | { | |
5480 | HDEBUG(D_any) | |
5481 | { | |
5482 | debug_printf("ETRN command is: %s\n", etrn_command); | |
5483 | debug_printf("ETRN command execution skipped\n"); | |
5484 | } | |
4e88a19f PH |
5485 | if (user_msg == NULL) smtp_printf("250 OK\r\n"); |
5486 | else smtp_user_msg(US"250", user_msg); | |
059ec3d9 PH |
5487 | break; |
5488 | } | |
5489 | ||
5490 | ||
5491 | /* If ETRN queue runs are to be serialized, check the database to | |
5492 | ensure one isn't already running. */ | |
5493 | ||
e8ae7214 | 5494 | if (smtp_etrn_serialize && !enq_start(etrn_serialize_key, 1)) |
059ec3d9 | 5495 | { |
ca86f471 | 5496 | smtp_printf("458 Already processing %s\r\n", smtp_cmd_data); |
059ec3d9 PH |
5497 | break; |
5498 | } | |
5499 | ||
5500 | /* Fork a child process and run the command. We don't want to have to | |
5501 | wait for the process at any point, so set SIGCHLD to SIG_IGN before | |
5502 | forking. It should be set that way anyway for external incoming SMTP, | |
5503 | but we save and restore to be tidy. If serialization is required, we | |
5504 | actually run the command in yet another process, so we can wait for it | |
5505 | to complete and then remove the serialization lock. */ | |
5506 | ||
5507 | oldsignal = signal(SIGCHLD, SIG_IGN); | |
5508 | ||
5509 | if ((pid = fork()) == 0) | |
5510 | { | |
f1e894f3 PH |
5511 | smtp_input = FALSE; /* This process is not associated with the */ |
5512 | (void)fclose(smtp_in); /* SMTP call any more. */ | |
5513 | (void)fclose(smtp_out); | |
059ec3d9 PH |
5514 | |
5515 | signal(SIGCHLD, SIG_DFL); /* Want to catch child */ | |
5516 | ||
5517 | /* If not serializing, do the exec right away. Otherwise, fork down | |
5518 | into another process. */ | |
5519 | ||
5520 | if (!smtp_etrn_serialize || (pid = fork()) == 0) | |
5521 | { | |
5522 | DEBUG(D_exec) debug_print_argv(argv); | |
5523 | exim_nullstd(); /* Ensure std{in,out,err} exist */ | |
5524 | execv(CS argv[0], (char *const *)argv); | |
5525 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "exec of \"%s\" (ETRN) failed: %s", | |
5526 | etrn_command, strerror(errno)); | |
5527 | _exit(EXIT_FAILURE); /* paranoia */ | |
5528 | } | |
5529 | ||
5530 | /* Obey this if smtp_serialize and the 2nd fork yielded non-zero. That | |
5531 | is, we are in the first subprocess, after forking again. All we can do | |
5532 | for a failing fork is to log it. Otherwise, wait for the 2nd process to | |
5533 | complete, before removing the serialization. */ | |
5534 | ||
5535 | if (pid < 0) | |
5536 | log_write(0, LOG_MAIN|LOG_PANIC, "2nd fork for serialized ETRN " | |
5537 | "failed: %s", strerror(errno)); | |
5538 | else | |
5539 | { | |
5540 | int status; | |
5541 | DEBUG(D_any) debug_printf("waiting for serialized ETRN process %d\n", | |
5542 | (int)pid); | |
5543 | (void)wait(&status); | |
5544 | DEBUG(D_any) debug_printf("serialized ETRN process %d ended\n", | |
5545 | (int)pid); | |
5546 | } | |
5547 | ||
5548 | enq_end(etrn_serialize_key); | |
5549 | _exit(EXIT_SUCCESS); | |
5550 | } | |
5551 | ||
5552 | /* Back in the top level SMTP process. Check that we started a subprocess | |
5553 | and restore the signal state. */ | |
5554 | ||
5555 | if (pid < 0) | |
5556 | { | |
5557 | log_write(0, LOG_MAIN|LOG_PANIC, "fork of process for ETRN failed: %s", | |
5558 | strerror(errno)); | |
5559 | smtp_printf("458 Unable to fork process\r\n"); | |
5560 | if (smtp_etrn_serialize) enq_end(etrn_serialize_key); | |
5561 | } | |
4e88a19f PH |
5562 | else |
5563 | { | |
5564 | if (user_msg == NULL) smtp_printf("250 OK\r\n"); | |
5565 | else smtp_user_msg(US"250", user_msg); | |
5566 | } | |
059ec3d9 PH |
5567 | |
5568 | signal(SIGCHLD, oldsignal); | |
5569 | break; | |
5570 | ||
5571 | ||
5572 | case BADARG_CMD: | |
5573 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
5574 | US"unexpected argument data"); | |
5575 | break; | |
5576 | ||
5577 | ||
5578 | /* This currently happens only for NULLs, but could be extended. */ | |
5579 | ||
5580 | case BADCHAR_CMD: | |
5581 | done = synprot_error(L_smtp_syntax_error, 0, NULL, /* Just logs */ | |
5582 | US"NULL character(s) present (shown as '?')"); | |
5583 | smtp_printf("501 NULL characters are not allowed in SMTP commands\r\n"); | |
5584 | break; | |
5585 | ||
5586 | ||
5587 | case BADSYN_CMD: | |
a14e5636 | 5588 | SYNC_FAILURE: |
bd8fbe36 JH |
5589 | if (smtp_inend >= smtp_inbuffer + IN_BUFFER_SIZE) |
5590 | smtp_inend = smtp_inbuffer + IN_BUFFER_SIZE - 1; | |
059ec3d9 PH |
5591 | c = smtp_inend - smtp_inptr; |
5592 | if (c > 150) c = 150; | |
5593 | smtp_inptr[c] = 0; | |
5594 | incomplete_transaction_log(US"sync failure"); | |
3af76a81 | 5595 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol synchronization error " |
059ec3d9 PH |
5596 | "(next input sent too soon: pipelining was%s advertised): " |
5597 | "rejected \"%s\" %s next input=\"%s\"", | |
5598 | pipelining_advertised? "" : " not", | |
3ee512ff | 5599 | smtp_cmd_buffer, host_and_ident(TRUE), |
059ec3d9 | 5600 | string_printing(smtp_inptr)); |
8f128379 PH |
5601 | smtp_notquit_exit(US"synchronization-error", US"554", |
5602 | US"SMTP synchronization error"); | |
059ec3d9 PH |
5603 | done = 1; /* Pretend eof - drops connection */ |
5604 | break; | |
5605 | ||
5606 | ||
5607 | case TOO_MANY_NONMAIL_CMD: | |
ca86f471 PH |
5608 | s = smtp_cmd_buffer; |
5609 | while (*s != 0 && !isspace(*s)) s++; | |
059ec3d9 PH |
5610 | incomplete_transaction_log(US"too many non-mail commands"); |
5611 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
5612 | "nonmail commands (last was \"%.*s\")", host_and_ident(FALSE), | |
6d9cfc47 | 5613 | (int)(s - smtp_cmd_buffer), smtp_cmd_buffer); |
8f128379 | 5614 | smtp_notquit_exit(US"bad-commands", US"554", US"Too many nonmail commands"); |
059ec3d9 PH |
5615 | done = 1; /* Pretend eof - drops connection */ |
5616 | break; | |
5617 | ||
cee5f132 | 5618 | #ifdef SUPPORT_PROXY |
a3c86431 TL |
5619 | case PROXY_FAIL_IGNORE_CMD: |
5620 | smtp_printf("503 Command refused, required Proxy negotiation failed\r\n"); | |
5621 | break; | |
cee5f132 | 5622 | #endif |
059ec3d9 PH |
5623 | |
5624 | default: | |
5625 | if (unknown_command_count++ >= smtp_max_unknown_commands) | |
5626 | { | |
5627 | log_write(L_smtp_syntax_error, LOG_MAIN, | |
5628 | "SMTP syntax error in \"%s\" %s %s", | |
3ee512ff | 5629 | string_printing(smtp_cmd_buffer), host_and_ident(TRUE), |
059ec3d9 PH |
5630 | US"unrecognized command"); |
5631 | incomplete_transaction_log(US"unrecognized command"); | |
8f128379 PH |
5632 | smtp_notquit_exit(US"bad-commands", US"500", |
5633 | US"Too many unrecognized commands"); | |
059ec3d9 PH |
5634 | done = 2; |
5635 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
5636 | "unrecognized commands (last was \"%s\")", host_and_ident(FALSE), | |
0ebc4d69 | 5637 | string_printing(smtp_cmd_buffer)); |
059ec3d9 PH |
5638 | } |
5639 | else | |
5640 | done = synprot_error(L_smtp_syntax_error, 500, NULL, | |
5641 | US"unrecognized command"); | |
5642 | break; | |
5643 | } | |
5644 | ||
5645 | /* This label is used by goto's inside loops that want to break out to | |
5646 | the end of the command-processing loop. */ | |
5647 | ||
5648 | COMMAND_LOOP: | |
5649 | last_was_rej_mail = was_rej_mail; /* Remember some last commands for */ | |
5650 | last_was_rcpt = was_rcpt; /* protocol error handling */ | |
5651 | continue; | |
5652 | } | |
5653 | ||
5654 | return done - 2; /* Convert yield values */ | |
5655 | } | |
5656 | ||
e45a1c37 JH |
5657 | /* vi: aw ai sw=2 |
5658 | */ | |
059ec3d9 | 5659 | /* End of smtp_in.c */ |