Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
80fea873 | 5 | /* Copyright (c) University of Cambridge 1995 - 2016 */ |
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 | ||
47 | #define smtp_cmd_buffer_size 16384 | |
059ec3d9 PH |
48 | |
49 | /* Size of buffer for reading SMTP incoming packets */ | |
50 | ||
51 | #define in_buffer_size 8192 | |
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 | ||
6d5c916c JH |
85 | /* RFC3030 section 2: "After all MAIL and RCPT responses are collected and |
86 | processed the message is sent using a series of BDAT commands" | |
87 | implies that BDAT should be synchronized. However, we see Google, at least, | |
88 | sending MAIL,RCPT,BDAT-LAST in a single packet, clearly not waiting for | |
89 | processing of the RPCT response(s). We shall do the same, and not require | |
90 | synch for BDAT. */ | |
91 | ||
92 | BDAT_CMD, | |
93 | ||
059ec3d9 PH |
94 | /* This is a dummy to identify the non-sync commands when not pipelining */ |
95 | ||
96 | NON_SYNC_CMD_NON_PIPELINING, | |
97 | ||
98 | /* I have been unable to find a statement about the use of pipelining | |
99 | with AUTH, so to be on the safe side it is here, though I kind of feel | |
100 | it should be up there with the synchronized commands. */ | |
101 | ||
102 | AUTH_CMD, | |
103 | ||
104 | /* I'm not sure about these, but I don't think they matter. */ | |
105 | ||
106 | QUIT_CMD, HELP_CMD, | |
107 | ||
cee5f132 | 108 | #ifdef SUPPORT_PROXY |
a3c86431 TL |
109 | PROXY_FAIL_IGNORE_CMD, |
110 | #endif | |
111 | ||
059ec3d9 PH |
112 | /* These are specials that don't correspond to actual commands */ |
113 | ||
114 | EOF_CMD, OTHER_CMD, BADARG_CMD, BADCHAR_CMD, BADSYN_CMD, | |
115 | TOO_MANY_NONMAIL_CMD }; | |
116 | ||
117 | ||
b4ed4da0 PH |
118 | /* This is a convenience macro for adding the identity of an SMTP command |
119 | to the circular buffer that holds a list of the last n received. */ | |
120 | ||
121 | #define HAD(n) \ | |
122 | smtp_connection_had[smtp_ch_index++] = n; \ | |
123 | if (smtp_ch_index >= SMTP_HBUFF_SIZE) smtp_ch_index = 0 | |
124 | ||
059ec3d9 PH |
125 | |
126 | /************************************************* | |
127 | * Local static variables * | |
128 | *************************************************/ | |
129 | ||
130 | static auth_instance *authenticated_by; | |
131 | static BOOL auth_advertised; | |
132 | #ifdef SUPPORT_TLS | |
133 | static BOOL tls_advertised; | |
134 | #endif | |
6c1c3d1d | 135 | static BOOL dsn_advertised; |
059ec3d9 PH |
136 | static BOOL esmtp; |
137 | static BOOL helo_required = FALSE; | |
138 | static BOOL helo_verify = FALSE; | |
139 | static BOOL helo_seen; | |
140 | static BOOL helo_accept_junk; | |
141 | static BOOL count_nonmail; | |
142 | static BOOL pipelining_advertised; | |
2679d413 PH |
143 | static BOOL rcpt_smtp_response_same; |
144 | static BOOL rcpt_in_progress; | |
059ec3d9 | 145 | static int nonmail_command_count; |
8f128379 | 146 | static BOOL smtp_exit_function_called = 0; |
8c5d388a | 147 | #ifdef SUPPORT_I18N |
d1a13eea JH |
148 | static BOOL smtputf8_advertised; |
149 | #endif | |
059ec3d9 PH |
150 | static int synprot_error_count; |
151 | static int unknown_command_count; | |
152 | static int sync_cmd_limit; | |
153 | static int smtp_write_error = 0; | |
154 | ||
2679d413 | 155 | static uschar *rcpt_smtp_response; |
ca86f471 PH |
156 | static uschar *smtp_data_buffer; |
157 | static uschar *smtp_cmd_data; | |
158 | ||
059ec3d9 PH |
159 | /* We need to know the position of RSET, HELO, EHLO, AUTH, and STARTTLS. Their |
160 | final fields of all except AUTH are forced TRUE at the start of a new message | |
161 | setup, to allow one of each between messages that is not counted as a nonmail | |
162 | command. (In fact, only one of HELO/EHLO is not counted.) Also, we have to | |
163 | allow a new EHLO after starting up TLS. | |
164 | ||
165 | AUTH is "falsely" labelled as a mail command initially, so that it doesn't get | |
166 | counted. However, the flag is changed when AUTH is received, so that multiple | |
167 | failing AUTHs will eventually hit the limit. After a successful AUTH, another | |
168 | AUTH is already forbidden. After a TLS session is started, AUTH's flag is again | |
169 | forced TRUE, to allow for the re-authentication that can happen at that point. | |
170 | ||
171 | QUIT is also "falsely" labelled as a mail command so that it doesn't up the | |
2f460950 JH |
172 | count of non-mail commands and possibly provoke an error. |
173 | ||
174 | tls_auth is a pseudo-command, never expected in input. It is activated | |
175 | on TLS startup and looks for a tls authenticator. */ | |
059ec3d9 PH |
176 | |
177 | static smtp_cmd_list cmd_list[] = { | |
d1a13eea JH |
178 | /* name len cmd has_arg is_mail_cmd */ |
179 | ||
059ec3d9 PH |
180 | { "rset", sizeof("rset")-1, RSET_CMD, FALSE, FALSE }, /* First */ |
181 | { "helo", sizeof("helo")-1, HELO_CMD, TRUE, FALSE }, | |
182 | { "ehlo", sizeof("ehlo")-1, EHLO_CMD, TRUE, FALSE }, | |
183 | { "auth", sizeof("auth")-1, AUTH_CMD, TRUE, TRUE }, | |
184 | #ifdef SUPPORT_TLS | |
185 | { "starttls", sizeof("starttls")-1, STARTTLS_CMD, FALSE, FALSE }, | |
b3ef41c9 | 186 | { "tls_auth", 0, TLS_AUTH_CMD, FALSE, TRUE }, |
059ec3d9 PH |
187 | #endif |
188 | ||
189 | /* If you change anything above here, also fix the definitions below. */ | |
190 | ||
191 | { "mail from:", sizeof("mail from:")-1, MAIL_CMD, TRUE, TRUE }, | |
192 | { "rcpt to:", sizeof("rcpt to:")-1, RCPT_CMD, TRUE, TRUE }, | |
193 | { "data", sizeof("data")-1, DATA_CMD, FALSE, TRUE }, | |
18481de3 | 194 | { "bdat", sizeof("bdat")-1, BDAT_CMD, TRUE, TRUE }, |
059ec3d9 PH |
195 | { "quit", sizeof("quit")-1, QUIT_CMD, FALSE, TRUE }, |
196 | { "noop", sizeof("noop")-1, NOOP_CMD, TRUE, FALSE }, | |
197 | { "etrn", sizeof("etrn")-1, ETRN_CMD, TRUE, FALSE }, | |
198 | { "vrfy", sizeof("vrfy")-1, VRFY_CMD, TRUE, FALSE }, | |
199 | { "expn", sizeof("expn")-1, EXPN_CMD, TRUE, FALSE }, | |
200 | { "help", sizeof("help")-1, HELP_CMD, TRUE, FALSE } | |
201 | }; | |
202 | ||
203 | static smtp_cmd_list *cmd_list_end = | |
204 | cmd_list + sizeof(cmd_list)/sizeof(smtp_cmd_list); | |
205 | ||
206 | #define CMD_LIST_RSET 0 | |
207 | #define CMD_LIST_HELO 1 | |
208 | #define CMD_LIST_EHLO 2 | |
209 | #define CMD_LIST_AUTH 3 | |
210 | #define CMD_LIST_STARTTLS 4 | |
b3ef41c9 | 211 | #define CMD_LIST_TLS_AUTH 5 |
059ec3d9 | 212 | |
b4ed4da0 PH |
213 | /* This list of names is used for performing the smtp_no_mail logging action. |
214 | It must be kept in step with the SCH_xxx enumerations. */ | |
215 | ||
216 | static uschar *smtp_names[] = | |
217 | { | |
18481de3 JH |
218 | US"NONE", US"AUTH", US"DATA", US"BDAT", US"EHLO", US"ETRN", US"EXPN", |
219 | US"HELO", US"HELP", US"MAIL", US"NOOP", US"QUIT", US"RCPT", US"RSET", | |
220 | US"STARTTLS", US"VRFY" }; | |
b4ed4da0 | 221 | |
e524074d | 222 | static uschar *protocols_local[] = { |
981756db PH |
223 | US"local-smtp", /* HELO */ |
224 | US"local-smtps", /* The rare case EHLO->STARTTLS->HELO */ | |
225 | US"local-esmtp", /* EHLO */ | |
226 | US"local-esmtps", /* EHLO->STARTTLS->EHLO */ | |
227 | US"local-esmtpa", /* EHLO->AUTH */ | |
228 | US"local-esmtpsa" /* EHLO->STARTTLS->EHLO->AUTH */ | |
059ec3d9 | 229 | }; |
e524074d JH |
230 | static uschar *protocols[] = { |
231 | US"smtp", /* HELO */ | |
232 | US"smtps", /* The rare case EHLO->STARTTLS->HELO */ | |
233 | US"esmtp", /* EHLO */ | |
234 | US"esmtps", /* EHLO->STARTTLS->EHLO */ | |
235 | US"esmtpa", /* EHLO->AUTH */ | |
236 | US"esmtpsa" /* EHLO->STARTTLS->EHLO->AUTH */ | |
237 | }; | |
059ec3d9 PH |
238 | |
239 | #define pnormal 0 | |
981756db PH |
240 | #define pextend 2 |
241 | #define pcrpted 1 /* added to pextend or pnormal */ | |
242 | #define pauthed 2 /* added to pextend */ | |
059ec3d9 | 243 | |
d27f98fe TL |
244 | /* Sanity check and validate optional args to MAIL FROM: envelope */ |
245 | enum { | |
2ef7ed08 | 246 | ENV_MAIL_OPT_NULL, |
d27f98fe | 247 | ENV_MAIL_OPT_SIZE, ENV_MAIL_OPT_BODY, ENV_MAIL_OPT_AUTH, |
8ccd00b1 | 248 | #ifndef DISABLE_PRDR |
fd98a5c6 | 249 | ENV_MAIL_OPT_PRDR, |
6c1c3d1d | 250 | #endif |
6c1c3d1d | 251 | ENV_MAIL_OPT_RET, ENV_MAIL_OPT_ENVID, |
8c5d388a | 252 | #ifdef SUPPORT_I18N |
d1a13eea JH |
253 | ENV_MAIL_OPT_UTF8, |
254 | #endif | |
d27f98fe TL |
255 | }; |
256 | typedef struct { | |
257 | uschar * name; /* option requested during MAIL cmd */ | |
258 | int value; /* enum type */ | |
259 | BOOL need_value; /* TRUE requires value (name=value pair format) | |
260 | FALSE is a singleton */ | |
261 | } env_mail_type_t; | |
262 | static env_mail_type_t env_mail_type_list[] = { | |
263 | { US"SIZE", ENV_MAIL_OPT_SIZE, TRUE }, | |
264 | { US"BODY", ENV_MAIL_OPT_BODY, TRUE }, | |
265 | { US"AUTH", ENV_MAIL_OPT_AUTH, TRUE }, | |
8ccd00b1 | 266 | #ifndef DISABLE_PRDR |
fd98a5c6 | 267 | { US"PRDR", ENV_MAIL_OPT_PRDR, FALSE }, |
6c1c3d1d | 268 | #endif |
6c1c3d1d WB |
269 | { US"RET", ENV_MAIL_OPT_RET, TRUE }, |
270 | { US"ENVID", ENV_MAIL_OPT_ENVID, TRUE }, | |
8c5d388a | 271 | #ifdef SUPPORT_I18N |
d1a13eea JH |
272 | { US"SMTPUTF8",ENV_MAIL_OPT_UTF8, FALSE }, /* rfc6531 */ |
273 | #endif | |
2ef7ed08 HSHR |
274 | /* keep this the last entry */ |
275 | { US"NULL", ENV_MAIL_OPT_NULL, FALSE }, | |
d27f98fe TL |
276 | }; |
277 | ||
059ec3d9 PH |
278 | /* When reading SMTP from a remote host, we have to use our own versions of the |
279 | C input-reading functions, in order to be able to flush the SMTP output only | |
280 | when about to read more data from the socket. This is the only way to get | |
281 | optimal performance when the client is using pipelining. Flushing for every | |
282 | command causes a separate packet and reply packet each time; saving all the | |
283 | responses up (when pipelining) combines them into one packet and one response. | |
284 | ||
285 | For simplicity, these functions are used for *all* SMTP input, not only when | |
286 | receiving over a socket. However, after setting up a secure socket (SSL), input | |
287 | is read via the OpenSSL library, and another set of functions is used instead | |
288 | (see tls.c). | |
289 | ||
290 | These functions are set in the receive_getc etc. variables and called with the | |
291 | same interface as the C functions. However, since there can only ever be | |
292 | one incoming SMTP call, we just use a single buffer and flags. There is no need | |
293 | to implement a complicated private FILE-like structure.*/ | |
294 | ||
295 | static uschar *smtp_inbuffer; | |
296 | static uschar *smtp_inptr; | |
297 | static uschar *smtp_inend; | |
298 | static int smtp_had_eof; | |
299 | static int smtp_had_error; | |
300 | ||
301 | ||
7e3ce68e JH |
302 | /* forward declarations */ |
303 | int bdat_ungetc(int ch); | |
304 | static int smtp_read_command(BOOL check_sync); | |
305 | static int synprot_error(int type, int code, uschar *data, uschar *errmess); | |
306 | static void smtp_quit_handler(uschar **, uschar **); | |
307 | static void smtp_rset_handler(void); | |
308 | ||
059ec3d9 PH |
309 | /************************************************* |
310 | * SMTP version of getc() * | |
311 | *************************************************/ | |
312 | ||
313 | /* This gets the next byte from the SMTP input buffer. If the buffer is empty, | |
314 | it flushes the output, and refills the buffer, with a timeout. The signal | |
315 | handler is set appropriately by the calling function. This function is not used | |
316 | after a connection has negotated itself into an TLS/SSL state. | |
317 | ||
318 | Arguments: none | |
319 | Returns: the next character or EOF | |
320 | */ | |
321 | ||
322 | int | |
323 | smtp_getc(void) | |
324 | { | |
325 | if (smtp_inptr >= smtp_inend) | |
326 | { | |
327 | int rc, save_errno; | |
60d10ce7 | 328 | if (!smtp_out) return EOF; |
059ec3d9 PH |
329 | fflush(smtp_out); |
330 | if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout); | |
331 | rc = read(fileno(smtp_in), smtp_inbuffer, in_buffer_size); | |
332 | save_errno = errno; | |
333 | alarm(0); | |
334 | if (rc <= 0) | |
335 | { | |
336 | /* Must put the error text in fixed store, because this might be during | |
337 | header reading, where it releases unused store above the header. */ | |
338 | if (rc < 0) | |
339 | { | |
340 | smtp_had_error = save_errno; | |
341 | smtp_read_error = string_copy_malloc( | |
342 | string_sprintf(" (error: %s)", strerror(save_errno))); | |
343 | } | |
344 | else smtp_had_eof = 1; | |
345 | return EOF; | |
346 | } | |
80a47a2c TK |
347 | #ifndef DISABLE_DKIM |
348 | dkim_exim_verify_feed(smtp_inbuffer, rc); | |
349 | #endif | |
059ec3d9 PH |
350 | smtp_inend = smtp_inbuffer + rc; |
351 | smtp_inptr = smtp_inbuffer; | |
352 | } | |
353 | return *smtp_inptr++; | |
354 | } | |
355 | ||
584e96c6 JH |
356 | void |
357 | smtp_get_cache(void) | |
358 | { | |
9960d1e5 | 359 | #ifndef DISABLE_DKIM |
584e96c6 JH |
360 | int n = smtp_inend - smtp_inptr; |
361 | if (n > 0) | |
362 | dkim_exim_verify_feed(smtp_inptr, n); | |
584e96c6 | 363 | #endif |
9960d1e5 | 364 | } |
059ec3d9 PH |
365 | |
366 | ||
7e3ce68e JH |
367 | /* Get a byte from the smtp input, in CHUNKING mode. Handle ack of the |
368 | previous BDAT chunk and getting new ones when we run out. Uses the | |
369 | underlying smtp_getc or tls_getc both for that and for getting the | |
370 | (buffered) data byte. EOD signals (an expected) no further data. | |
371 | ERR signals a protocol error, and EOF a closed input stream. | |
372 | ||
373 | Called from read_bdat_smtp() in receive.c for the message body, but also | |
374 | by the headers read loop in receive_msg(); manipulates chunking_state | |
375 | to handle the BDAT command/response. | |
376 | Placed here due to the correlation with the above smtp_getc(), which it wraps, | |
377 | and also by the need to do smtp command/response handling. | |
378 | ||
379 | Arguments: none | |
380 | Returns: the next character or ERR, EOD or EOF | |
381 | */ | |
382 | ||
383 | int | |
384 | bdat_getc(void) | |
385 | { | |
386 | uschar * user_msg = NULL; | |
387 | uschar * log_msg; | |
388 | ||
389 | for(;;) | |
390 | { | |
391 | if (chunking_data_left-- > 0) | |
392 | return lwr_receive_getc(); | |
393 | ||
394 | receive_getc = lwr_receive_getc; | |
395 | receive_ungetc = lwr_receive_ungetc; | |
396 | ||
397 | /* If not the last, ack the received chunk. The last response is delayed | |
398 | until after the data ACL decides on it */ | |
7e3ce68e JH |
399 | |
400 | if (chunking_state == CHUNKING_LAST) | |
584e96c6 JH |
401 | { |
402 | #ifndef DISABLE_DKIM | |
e983e85a | 403 | dkim_exim_verify_feed(NULL, 0); /* notify EOD */ |
584e96c6 | 404 | #endif |
7e3ce68e | 405 | return EOD; |
584e96c6 | 406 | } |
7e3ce68e JH |
407 | |
408 | chunking_state = CHUNKING_OFFERED; | |
409 | smtp_printf("250 %u byte chunk received\r\n", chunking_datasize); | |
410 | ||
411 | /* Expect another BDAT cmd from input. RFC 3030 says nothing about | |
412 | QUIT, RSET or NOOP but handling them seems obvious */ | |
413 | ||
414 | next_cmd: | |
415 | switch(smtp_read_command(TRUE)) | |
416 | { | |
417 | default: | |
418 | (void) synprot_error(L_smtp_protocol_error, 503, NULL, | |
419 | US"only BDAT permissible after non-LAST BDAT"); | |
420 | ||
421 | repeat_until_rset: | |
422 | switch(smtp_read_command(TRUE)) | |
423 | { | |
424 | case QUIT_CMD: smtp_quit_handler(&user_msg, &log_msg); /*FALLTHROUGH */ | |
425 | case EOF_CMD: return EOF; | |
426 | case RSET_CMD: smtp_rset_handler(); return ERR; | |
427 | default: if (synprot_error(L_smtp_protocol_error, 503, NULL, | |
428 | US"only RSET accepted now") > 0) | |
429 | return EOF; | |
430 | goto repeat_until_rset; | |
431 | } | |
432 | ||
433 | case QUIT_CMD: | |
434 | smtp_quit_handler(&user_msg, &log_msg); | |
435 | /*FALLTHROUGH*/ | |
436 | case EOF_CMD: | |
437 | return EOF; | |
438 | ||
439 | case RSET_CMD: | |
440 | smtp_rset_handler(); | |
441 | return ERR; | |
442 | ||
443 | case NOOP_CMD: | |
444 | HAD(SCH_NOOP); | |
445 | smtp_printf("250 OK\r\n"); | |
446 | goto next_cmd; | |
447 | ||
448 | case BDAT_CMD: | |
449 | { | |
450 | int n; | |
451 | ||
452 | if (sscanf(CS smtp_cmd_data, "%u %n", &chunking_datasize, &n) < 1) | |
453 | { | |
454 | (void) synprot_error(L_smtp_protocol_error, 501, NULL, | |
455 | US"missing size for BDAT command"); | |
456 | return ERR; | |
457 | } | |
458 | chunking_state = strcmpic(smtp_cmd_data+n, US"LAST") == 0 | |
459 | ? CHUNKING_LAST : CHUNKING_ACTIVE; | |
460 | chunking_data_left = chunking_datasize; | |
461 | ||
462 | if (chunking_datasize == 0) | |
463 | if (chunking_state == CHUNKING_LAST) | |
464 | return EOD; | |
465 | else | |
466 | { | |
467 | (void) synprot_error(L_smtp_protocol_error, 504, NULL, | |
468 | US"zero size for BDAT command"); | |
469 | goto repeat_until_rset; | |
470 | } | |
471 | ||
472 | receive_getc = bdat_getc; | |
473 | receive_ungetc = bdat_ungetc; | |
474 | break; /* to top of main loop */ | |
475 | } | |
476 | } | |
477 | } | |
478 | } | |
479 | ||
45bd315d JH |
480 | static void |
481 | bdat_flush_data(void) | |
482 | { | |
483 | while (chunking_data_left-- > 0) | |
484 | if (lwr_receive_getc() < 0) | |
485 | break; | |
486 | ||
487 | receive_getc = lwr_receive_getc; | |
488 | receive_ungetc = lwr_receive_ungetc; | |
489 | ||
490 | if (chunking_state != CHUNKING_LAST) | |
491 | chunking_state = CHUNKING_OFFERED; | |
492 | } | |
493 | ||
7e3ce68e JH |
494 | |
495 | ||
496 | ||
059ec3d9 PH |
497 | /************************************************* |
498 | * SMTP version of ungetc() * | |
499 | *************************************************/ | |
500 | ||
501 | /* Puts a character back in the input buffer. Only ever | |
502 | called once. | |
503 | ||
504 | Arguments: | |
505 | ch the character | |
506 | ||
507 | Returns: the character | |
508 | */ | |
509 | ||
510 | int | |
511 | smtp_ungetc(int ch) | |
512 | { | |
7e3ce68e | 513 | *--smtp_inptr = ch; |
059ec3d9 PH |
514 | return ch; |
515 | } | |
516 | ||
517 | ||
7e3ce68e JH |
518 | int |
519 | bdat_ungetc(int ch) | |
520 | { | |
521 | chunking_data_left++; | |
522 | return lwr_receive_ungetc(ch); | |
523 | } | |
524 | ||
059ec3d9 PH |
525 | |
526 | ||
527 | /************************************************* | |
528 | * SMTP version of feof() * | |
529 | *************************************************/ | |
530 | ||
531 | /* Tests for a previous EOF | |
532 | ||
533 | Arguments: none | |
534 | Returns: non-zero if the eof flag is set | |
535 | */ | |
536 | ||
537 | int | |
538 | smtp_feof(void) | |
539 | { | |
540 | return smtp_had_eof; | |
541 | } | |
542 | ||
543 | ||
544 | ||
545 | ||
546 | /************************************************* | |
547 | * SMTP version of ferror() * | |
548 | *************************************************/ | |
549 | ||
550 | /* Tests for a previous read error, and returns with errno | |
551 | restored to what it was when the error was detected. | |
552 | ||
553 | Arguments: none | |
554 | Returns: non-zero if the error flag is set | |
555 | */ | |
556 | ||
557 | int | |
558 | smtp_ferror(void) | |
559 | { | |
560 | errno = smtp_had_error; | |
561 | return smtp_had_error; | |
562 | } | |
563 | ||
564 | ||
565 | ||
58eb016e PH |
566 | /************************************************* |
567 | * Test for characters in the SMTP buffer * | |
568 | *************************************************/ | |
569 | ||
570 | /* Used at the end of a message | |
571 | ||
572 | Arguments: none | |
573 | Returns: TRUE/FALSE | |
574 | */ | |
575 | ||
576 | BOOL | |
577 | smtp_buffered(void) | |
578 | { | |
579 | return smtp_inptr < smtp_inend; | |
580 | } | |
581 | ||
582 | ||
059ec3d9 PH |
583 | |
584 | /************************************************* | |
585 | * Write formatted string to SMTP channel * | |
586 | *************************************************/ | |
587 | ||
588 | /* This is a separate function so that we don't have to repeat everything for | |
589 | TLS support or debugging. It is global so that the daemon and the | |
590 | authentication functions can use it. It does not return any error indication, | |
591 | because major problems such as dropped connections won't show up till an output | |
592 | flush for non-TLS connections. The smtp_fflush() function is available for | |
593 | checking that: for convenience, TLS output errors are remembered here so that | |
594 | they are also picked up later by smtp_fflush(). | |
595 | ||
596 | Arguments: | |
597 | format format string | |
598 | ... optional arguments | |
599 | ||
600 | Returns: nothing | |
601 | */ | |
602 | ||
603 | void | |
1ba28e2b | 604 | smtp_printf(const char *format, ...) |
059ec3d9 PH |
605 | { |
606 | va_list ap; | |
607 | ||
ce552449 NM |
608 | va_start(ap, format); |
609 | smtp_vprintf(format, ap); | |
610 | va_end(ap); | |
611 | } | |
612 | ||
613 | /* This is split off so that verify.c:respond_printf() can, in effect, call | |
614 | smtp_printf(), bearing in mind that in C a vararg function can't directly | |
fb08281f | 615 | call another vararg function, only a function which accepts a va_list. */ |
ce552449 NM |
616 | |
617 | void | |
1ba28e2b | 618 | smtp_vprintf(const char *format, va_list ap) |
ce552449 | 619 | { |
fb08281f DW |
620 | BOOL yield; |
621 | ||
622 | yield = string_vformat(big_buffer, big_buffer_size, format, ap); | |
ce552449 | 623 | |
059ec3d9 PH |
624 | DEBUG(D_receive) |
625 | { | |
fb08281f DW |
626 | void *reset_point = store_get(0); |
627 | uschar *msg_copy, *cr, *end; | |
628 | msg_copy = string_copy(big_buffer); | |
629 | end = msg_copy + Ustrlen(msg_copy); | |
630 | while ((cr = Ustrchr(msg_copy, '\r')) != NULL) /* lose CRs */ | |
631 | memmove(cr, cr + 1, (end--) - cr); | |
632 | debug_printf("SMTP>> %s", msg_copy); | |
633 | store_reset(reset_point); | |
059ec3d9 PH |
634 | } |
635 | ||
fb08281f | 636 | if (!yield) |
2679d413 PH |
637 | { |
638 | log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_printf()"); | |
639 | smtp_closedown(US"Unexpected error"); | |
640 | exim_exit(EXIT_FAILURE); | |
641 | } | |
2679d413 PH |
642 | |
643 | /* If this is the first output for a (non-batch) RCPT command, see if all RCPTs | |
644 | have had the same. Note: this code is also present in smtp_respond(). It would | |
645 | be tidier to have it only in one place, but when it was added, it was easier to | |
646 | do it that way, so as not to have to mess with the code for the RCPT command, | |
647 | which sometimes uses smtp_printf() and sometimes smtp_respond(). */ | |
648 | ||
649 | if (rcpt_in_progress) | |
650 | { | |
651 | if (rcpt_smtp_response == NULL) | |
652 | rcpt_smtp_response = string_copy(big_buffer); | |
653 | else if (rcpt_smtp_response_same && | |
654 | Ustrcmp(rcpt_smtp_response, big_buffer) != 0) | |
655 | rcpt_smtp_response_same = FALSE; | |
656 | rcpt_in_progress = FALSE; | |
657 | } | |
059ec3d9 | 658 | |
2679d413 | 659 | /* Now write the string */ |
059ec3d9 PH |
660 | |
661 | #ifdef SUPPORT_TLS | |
817d9f57 | 662 | if (tls_in.active >= 0) |
059ec3d9 | 663 | { |
817d9f57 JH |
664 | if (tls_write(TRUE, big_buffer, Ustrlen(big_buffer)) < 0) |
665 | smtp_write_error = -1; | |
059ec3d9 PH |
666 | } |
667 | else | |
668 | #endif | |
669 | ||
2679d413 | 670 | if (fprintf(smtp_out, "%s", big_buffer) < 0) smtp_write_error = -1; |
059ec3d9 PH |
671 | } |
672 | ||
673 | ||
674 | ||
675 | /************************************************* | |
676 | * Flush SMTP out and check for error * | |
677 | *************************************************/ | |
678 | ||
679 | /* This function isn't currently used within Exim (it detects errors when it | |
680 | tries to read the next SMTP input), but is available for use in local_scan(). | |
681 | For non-TLS connections, it flushes the output and checks for errors. For | |
682 | TLS-connections, it checks for a previously-detected TLS write error. | |
683 | ||
684 | Arguments: none | |
685 | Returns: 0 for no error; -1 after an error | |
686 | */ | |
687 | ||
688 | int | |
689 | smtp_fflush(void) | |
690 | { | |
817d9f57 | 691 | if (tls_in.active < 0 && fflush(smtp_out) != 0) smtp_write_error = -1; |
059ec3d9 PH |
692 | return smtp_write_error; |
693 | } | |
694 | ||
695 | ||
696 | ||
697 | /************************************************* | |
698 | * SMTP command read timeout * | |
699 | *************************************************/ | |
700 | ||
701 | /* Signal handler for timing out incoming SMTP commands. This attempts to | |
702 | finish off tidily. | |
703 | ||
704 | Argument: signal number (SIGALRM) | |
705 | Returns: nothing | |
706 | */ | |
707 | ||
708 | static void | |
709 | command_timeout_handler(int sig) | |
710 | { | |
711 | sig = sig; /* Keep picky compilers happy */ | |
712 | log_write(L_lost_incoming_connection, | |
713 | LOG_MAIN, "SMTP command timeout on%s connection from %s", | |
817d9f57 | 714 | (tls_in.active >= 0)? " TLS" : "", |
059ec3d9 PH |
715 | host_and_ident(FALSE)); |
716 | if (smtp_batched_input) | |
717 | moan_smtp_batch(NULL, "421 SMTP command timeout"); /* Does not return */ | |
8f128379 PH |
718 | smtp_notquit_exit(US"command-timeout", US"421", |
719 | US"%s: SMTP command timeout - closing connection", smtp_active_hostname); | |
059ec3d9 PH |
720 | exim_exit(EXIT_FAILURE); |
721 | } | |
722 | ||
723 | ||
724 | ||
725 | /************************************************* | |
726 | * SIGTERM received * | |
727 | *************************************************/ | |
728 | ||
729 | /* Signal handler for handling SIGTERM. Again, try to finish tidily. | |
730 | ||
731 | Argument: signal number (SIGTERM) | |
732 | Returns: nothing | |
733 | */ | |
734 | ||
735 | static void | |
736 | command_sigterm_handler(int sig) | |
737 | { | |
738 | sig = sig; /* Keep picky compilers happy */ | |
739 | log_write(0, LOG_MAIN, "%s closed after SIGTERM", smtp_get_connection_info()); | |
740 | if (smtp_batched_input) | |
741 | moan_smtp_batch(NULL, "421 SIGTERM received"); /* Does not return */ | |
8f128379 PH |
742 | smtp_notquit_exit(US"signal-exit", US"421", |
743 | US"%s: Service not available - closing connection", smtp_active_hostname); | |
059ec3d9 PH |
744 | exim_exit(EXIT_FAILURE); |
745 | } | |
746 | ||
747 | ||
748 | ||
a14e5636 | 749 | |
cee5f132 | 750 | #ifdef SUPPORT_PROXY |
a3bddaa8 TL |
751 | /************************************************* |
752 | * Restore socket timeout to previous value * | |
753 | *************************************************/ | |
754 | /* If the previous value was successfully retrieved, restore | |
755 | it before returning control to the non-proxy routines | |
756 | ||
757 | Arguments: fd - File descriptor for input | |
758 | get_ok - Successfully retrieved previous values | |
759 | tvtmp - Time struct with previous values | |
760 | vslen - Length of time struct | |
761 | Returns: none | |
762 | */ | |
763 | static void | |
f267271d | 764 | restore_socket_timeout(int fd, int get_ok, struct timeval * tvtmp, socklen_t vslen) |
a3bddaa8 TL |
765 | { |
766 | if (get_ok == 0) | |
f267271d | 767 | (void) setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS tvtmp, vslen); |
a3bddaa8 TL |
768 | } |
769 | ||
a3c86431 TL |
770 | /************************************************* |
771 | * Check if host is required proxy host * | |
772 | *************************************************/ | |
773 | /* The function determines if inbound host will be a regular smtp host | |
774 | or if it is configured that it must use Proxy Protocol. | |
775 | ||
776 | Arguments: none | |
777 | Returns: bool | |
778 | */ | |
779 | ||
780 | static BOOL | |
781 | check_proxy_protocol_host() | |
782 | { | |
783 | int rc; | |
784 | /* Cannot configure local connection as a proxy inbound */ | |
785 | if (sender_host_address == NULL) return proxy_session; | |
786 | ||
7a2fa0bc | 787 | rc = verify_check_this_host(CUSS &hosts_proxy, NULL, NULL, |
a3c86431 TL |
788 | sender_host_address, NULL); |
789 | if (rc == OK) | |
790 | { | |
791 | DEBUG(D_receive) | |
792 | debug_printf("Detected proxy protocol configured host\n"); | |
793 | proxy_session = TRUE; | |
794 | } | |
795 | return proxy_session; | |
796 | } | |
797 | ||
798 | ||
a3c86431 TL |
799 | /************************************************* |
800 | * Setup host for proxy protocol * | |
801 | *************************************************/ | |
802 | /* The function configures the connection based on a header from the | |
803 | inbound host to use Proxy Protocol. The specification is very exact | |
804 | so exit with an error if do not find the exact required pieces. This | |
805 | includes an incorrect number of spaces separating args. | |
806 | ||
807 | Arguments: none | |
f267271d | 808 | Returns: Boolean success |
a3c86431 TL |
809 | */ |
810 | ||
811 | static BOOL | |
812 | setup_proxy_protocol_host() | |
813 | { | |
814 | union { | |
815 | struct { | |
816 | uschar line[108]; | |
817 | } v1; | |
818 | struct { | |
819 | uschar sig[12]; | |
36719342 TL |
820 | uint8_t ver_cmd; |
821 | uint8_t fam; | |
822 | uint16_t len; | |
a3c86431 TL |
823 | union { |
824 | struct { /* TCP/UDP over IPv4, len = 12 */ | |
825 | uint32_t src_addr; | |
826 | uint32_t dst_addr; | |
827 | uint16_t src_port; | |
828 | uint16_t dst_port; | |
829 | } ip4; | |
830 | struct { /* TCP/UDP over IPv6, len = 36 */ | |
831 | uint8_t src_addr[16]; | |
832 | uint8_t dst_addr[16]; | |
833 | uint16_t src_port; | |
834 | uint16_t dst_port; | |
835 | } ip6; | |
836 | struct { /* AF_UNIX sockets, len = 216 */ | |
837 | uschar src_addr[108]; | |
838 | uschar dst_addr[108]; | |
839 | } unx; | |
840 | } addr; | |
841 | } v2; | |
842 | } hdr; | |
843 | ||
eb57651e TL |
844 | /* Temp variables used in PPv2 address:port parsing */ |
845 | uint16_t tmpport; | |
846 | char tmpip[INET_ADDRSTRLEN]; | |
847 | struct sockaddr_in tmpaddr; | |
848 | char tmpip6[INET6_ADDRSTRLEN]; | |
849 | struct sockaddr_in6 tmpaddr6; | |
850 | ||
851 | int get_ok = 0; | |
f267271d JH |
852 | int size, ret; |
853 | int fd = fileno(smtp_in); | |
36719342 | 854 | const char v2sig[12] = "\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A"; |
a3c86431 TL |
855 | uschar *iptype; /* To display debug info */ |
856 | struct timeval tv; | |
a3bddaa8 | 857 | struct timeval tvtmp; |
f267271d | 858 | socklen_t vslen = sizeof(struct timeval); |
a3c86431 | 859 | |
a3bddaa8 | 860 | /* Save current socket timeout values */ |
f267271d | 861 | get_ok = getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tvtmp, &vslen); |
a3bddaa8 | 862 | |
a3c86431 TL |
863 | /* Proxy Protocol host must send header within a short time |
864 | (default 3 seconds) or it's considered invalid */ | |
865 | tv.tv_sec = PROXY_NEGOTIATION_TIMEOUT_SEC; | |
866 | tv.tv_usec = PROXY_NEGOTIATION_TIMEOUT_USEC; | |
f267271d JH |
867 | if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, CS &tv, sizeof(tv)) < 0) |
868 | return FALSE; | |
a3bddaa8 | 869 | |
a3c86431 TL |
870 | do |
871 | { | |
eb57651e TL |
872 | /* The inbound host was declared to be a Proxy Protocol host, so |
873 | don't do a PEEK into the data, actually slurp it up. */ | |
874 | ret = recv(fd, &hdr, sizeof(hdr), 0); | |
a3c86431 TL |
875 | } |
876 | while (ret == -1 && errno == EINTR); | |
877 | ||
878 | if (ret == -1) | |
f267271d | 879 | goto proxyfail; |
a3c86431 TL |
880 | |
881 | if (ret >= 16 && | |
36719342 | 882 | memcmp(&hdr.v2, v2sig, 12) == 0) |
a3c86431 | 883 | { |
36719342 TL |
884 | uint8_t ver, cmd; |
885 | ||
886 | /* May 2014: haproxy combined the version and command into one byte to | |
887 | allow two full bytes for the length field in order to proxy SSL | |
888 | connections. SSL Proxy is not supported in this version of Exim, but | |
889 | must still seperate values here. */ | |
890 | ver = (hdr.v2.ver_cmd & 0xf0) >> 4; | |
891 | cmd = (hdr.v2.ver_cmd & 0x0f); | |
892 | ||
893 | if (ver != 0x02) | |
894 | { | |
895 | DEBUG(D_receive) debug_printf("Invalid Proxy Protocol version: %d\n", ver); | |
896 | goto proxyfail; | |
897 | } | |
a3c86431 | 898 | DEBUG(D_receive) debug_printf("Detected PROXYv2 header\n"); |
36719342 | 899 | /* The v2 header will always be 16 bytes per the spec. */ |
a3c86431 TL |
900 | size = 16 + hdr.v2.len; |
901 | if (ret < size) | |
902 | { | |
36719342 TL |
903 | DEBUG(D_receive) debug_printf("Truncated or too large PROXYv2 header (%d/%d)\n", |
904 | ret, size); | |
a3c86431 TL |
905 | goto proxyfail; |
906 | } | |
36719342 | 907 | switch (cmd) |
a3c86431 TL |
908 | { |
909 | case 0x01: /* PROXY command */ | |
910 | switch (hdr.v2.fam) | |
911 | { | |
eb57651e TL |
912 | case 0x11: /* TCPv4 address type */ |
913 | iptype = US"IPv4"; | |
914 | tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.src_addr; | |
915 | inet_ntop(AF_INET, &(tmpaddr.sin_addr), (char *)&tmpip, sizeof(tmpip)); | |
916 | if (!string_is_ip_address(US tmpip,NULL)) | |
917 | { | |
918 | DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype); | |
f267271d | 919 | goto proxyfail; |
eb57651e | 920 | } |
e6d2a989 | 921 | proxy_local_address = sender_host_address; |
eb57651e TL |
922 | sender_host_address = string_copy(US tmpip); |
923 | tmpport = ntohs(hdr.v2.addr.ip4.src_port); | |
e6d2a989 | 924 | proxy_local_port = sender_host_port; |
eb57651e TL |
925 | sender_host_port = tmpport; |
926 | /* Save dest ip/port */ | |
927 | tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.dst_addr; | |
928 | inet_ntop(AF_INET, &(tmpaddr.sin_addr), (char *)&tmpip, sizeof(tmpip)); | |
929 | if (!string_is_ip_address(US tmpip,NULL)) | |
930 | { | |
931 | DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype); | |
f267271d | 932 | goto proxyfail; |
eb57651e | 933 | } |
7a2fa0bc | 934 | proxy_external_address = string_copy(US tmpip); |
eb57651e | 935 | tmpport = ntohs(hdr.v2.addr.ip4.dst_port); |
7a2fa0bc | 936 | proxy_external_port = tmpport; |
a3c86431 | 937 | goto done; |
eb57651e TL |
938 | case 0x21: /* TCPv6 address type */ |
939 | iptype = US"IPv6"; | |
940 | memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.src_addr, 16); | |
941 | inet_ntop(AF_INET6, &(tmpaddr6.sin6_addr), (char *)&tmpip6, sizeof(tmpip6)); | |
942 | if (!string_is_ip_address(US tmpip6,NULL)) | |
943 | { | |
944 | DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype); | |
f267271d | 945 | goto proxyfail; |
eb57651e | 946 | } |
e6d2a989 | 947 | proxy_local_address = sender_host_address; |
eb57651e TL |
948 | sender_host_address = string_copy(US tmpip6); |
949 | tmpport = ntohs(hdr.v2.addr.ip6.src_port); | |
e6d2a989 | 950 | proxy_local_port = sender_host_port; |
eb57651e TL |
951 | sender_host_port = tmpport; |
952 | /* Save dest ip/port */ | |
953 | memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.dst_addr, 16); | |
954 | inet_ntop(AF_INET6, &(tmpaddr6.sin6_addr), (char *)&tmpip6, sizeof(tmpip6)); | |
955 | if (!string_is_ip_address(US tmpip6,NULL)) | |
956 | { | |
957 | DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype); | |
f267271d | 958 | goto proxyfail; |
eb57651e | 959 | } |
7a2fa0bc | 960 | proxy_external_address = string_copy(US tmpip6); |
eb57651e | 961 | tmpport = ntohs(hdr.v2.addr.ip6.dst_port); |
7a2fa0bc | 962 | proxy_external_port = tmpport; |
a3c86431 | 963 | goto done; |
eb57651e TL |
964 | default: |
965 | DEBUG(D_receive) | |
966 | debug_printf("Unsupported PROXYv2 connection type: 0x%02x\n", | |
967 | hdr.v2.fam); | |
968 | goto proxyfail; | |
a3c86431 TL |
969 | } |
970 | /* Unsupported protocol, keep local connection address */ | |
971 | break; | |
972 | case 0x00: /* LOCAL command */ | |
973 | /* Keep local connection address for LOCAL */ | |
974 | break; | |
975 | default: | |
eb57651e | 976 | DEBUG(D_receive) |
36719342 | 977 | debug_printf("Unsupported PROXYv2 command: 0x%x\n", cmd); |
a3c86431 TL |
978 | goto proxyfail; |
979 | } | |
980 | } | |
981 | else if (ret >= 8 && | |
982 | memcmp(hdr.v1.line, "PROXY", 5) == 0) | |
983 | { | |
984 | uschar *p = string_copy(hdr.v1.line); | |
985 | uschar *end = memchr(p, '\r', ret - 1); | |
986 | uschar *sp; /* Utility variables follow */ | |
987 | int tmp_port; | |
988 | char *endc; | |
989 | ||
990 | if (!end || end[1] != '\n') | |
991 | { | |
992 | DEBUG(D_receive) debug_printf("Partial or invalid PROXY header\n"); | |
993 | goto proxyfail; | |
994 | } | |
995 | *end = '\0'; /* Terminate the string */ | |
996 | size = end + 2 - hdr.v1.line; /* Skip header + CRLF */ | |
997 | DEBUG(D_receive) debug_printf("Detected PROXYv1 header\n"); | |
998 | /* Step through the string looking for the required fields. Ensure | |
999 | strict adherance to required formatting, exit for any error. */ | |
1000 | p += 5; | |
1001 | if (!isspace(*(p++))) | |
1002 | { | |
1003 | DEBUG(D_receive) debug_printf("Missing space after PROXY command\n"); | |
1004 | goto proxyfail; | |
1005 | } | |
1006 | if (!Ustrncmp(p, CCS"TCP4", 4)) | |
1007 | iptype = US"IPv4"; | |
1008 | else if (!Ustrncmp(p,CCS"TCP6", 4)) | |
1009 | iptype = US"IPv6"; | |
1010 | else if (!Ustrncmp(p,CCS"UNKNOWN", 7)) | |
1011 | { | |
1012 | iptype = US"Unknown"; | |
1013 | goto done; | |
1014 | } | |
1015 | else | |
1016 | { | |
1017 | DEBUG(D_receive) debug_printf("Invalid TCP type\n"); | |
1018 | goto proxyfail; | |
1019 | } | |
1020 | ||
1021 | p += Ustrlen(iptype); | |
1022 | if (!isspace(*(p++))) | |
1023 | { | |
1024 | DEBUG(D_receive) debug_printf("Missing space after TCP4/6 command\n"); | |
1025 | goto proxyfail; | |
1026 | } | |
1027 | /* Find the end of the arg */ | |
1028 | if ((sp = Ustrchr(p, ' ')) == NULL) | |
1029 | { | |
1030 | DEBUG(D_receive) | |
1031 | debug_printf("Did not find proxied src %s\n", iptype); | |
1032 | goto proxyfail; | |
1033 | } | |
1034 | *sp = '\0'; | |
1035 | if(!string_is_ip_address(p,NULL)) | |
1036 | { | |
1037 | DEBUG(D_receive) | |
1038 | debug_printf("Proxied src arg is not an %s address\n", iptype); | |
1039 | goto proxyfail; | |
1040 | } | |
e6d2a989 | 1041 | proxy_local_address = sender_host_address; |
a3c86431 TL |
1042 | sender_host_address = p; |
1043 | p = sp + 1; | |
1044 | if ((sp = Ustrchr(p, ' ')) == NULL) | |
1045 | { | |
1046 | DEBUG(D_receive) | |
1047 | debug_printf("Did not find proxy dest %s\n", iptype); | |
1048 | goto proxyfail; | |
1049 | } | |
1050 | *sp = '\0'; | |
1051 | if(!string_is_ip_address(p,NULL)) | |
1052 | { | |
1053 | DEBUG(D_receive) | |
1054 | debug_printf("Proxy dest arg is not an %s address\n", iptype); | |
1055 | goto proxyfail; | |
1056 | } | |
7a2fa0bc | 1057 | proxy_external_address = p; |
a3c86431 TL |
1058 | p = sp + 1; |
1059 | if ((sp = Ustrchr(p, ' ')) == NULL) | |
1060 | { | |
1061 | DEBUG(D_receive) debug_printf("Did not find proxied src port\n"); | |
1062 | goto proxyfail; | |
1063 | } | |
1064 | *sp = '\0'; | |
1065 | tmp_port = strtol(CCS p,&endc,10); | |
1066 | if (*endc || tmp_port == 0) | |
1067 | { | |
1068 | DEBUG(D_receive) | |
1069 | debug_printf("Proxied src port '%s' not an integer\n", p); | |
1070 | goto proxyfail; | |
1071 | } | |
e6d2a989 | 1072 | proxy_local_port = sender_host_port; |
a3c86431 TL |
1073 | sender_host_port = tmp_port; |
1074 | p = sp + 1; | |
1075 | if ((sp = Ustrchr(p, '\0')) == NULL) | |
1076 | { | |
1077 | DEBUG(D_receive) debug_printf("Did not find proxy dest port\n"); | |
1078 | goto proxyfail; | |
1079 | } | |
1080 | tmp_port = strtol(CCS p,&endc,10); | |
1081 | if (*endc || tmp_port == 0) | |
1082 | { | |
1083 | DEBUG(D_receive) | |
1084 | debug_printf("Proxy dest port '%s' not an integer\n", p); | |
1085 | goto proxyfail; | |
1086 | } | |
7a2fa0bc | 1087 | proxy_external_port = tmp_port; |
a3c86431 TL |
1088 | /* Already checked for /r /n above. Good V1 header received. */ |
1089 | goto done; | |
1090 | } | |
1091 | else | |
1092 | { | |
1093 | /* Wrong protocol */ | |
eb57651e | 1094 | DEBUG(D_receive) debug_printf("Invalid proxy protocol version negotiation\n"); |
a3c86431 TL |
1095 | goto proxyfail; |
1096 | } | |
1097 | ||
1098 | proxyfail: | |
f267271d | 1099 | restore_socket_timeout(fd, get_ok, &tvtmp, vslen); |
a3c86431 | 1100 | /* Don't flush any potential buffer contents. Any input should cause a |
eb57651e | 1101 | synchronization failure */ |
a3c86431 TL |
1102 | return FALSE; |
1103 | ||
1104 | done: | |
f267271d | 1105 | restore_socket_timeout(fd, get_ok, &tvtmp, vslen); |
a3c86431 | 1106 | DEBUG(D_receive) |
eb57651e | 1107 | debug_printf("Valid %s sender from Proxy Protocol header\n", iptype); |
a3c86431 TL |
1108 | return proxy_session; |
1109 | } | |
1110 | #endif | |
1111 | ||
059ec3d9 PH |
1112 | /************************************************* |
1113 | * Read one command line * | |
1114 | *************************************************/ | |
1115 | ||
1116 | /* Strictly, SMTP commands coming over the net are supposed to end with CRLF. | |
1117 | There are sites that don't do this, and in any case internal SMTP probably | |
1118 | should check only for LF. Consequently, we check here for LF only. The line | |
1119 | ends up with [CR]LF removed from its end. If we get an overlong line, treat as | |
3ee512ff PH |
1120 | an unknown command. The command is read into the global smtp_cmd_buffer so that |
1121 | it is available via $smtp_command. | |
059ec3d9 PH |
1122 | |
1123 | The character reading routine sets up a timeout for each block actually read | |
1124 | from the input (which may contain more than one command). We set up a special | |
1125 | signal handler that closes down the session on a timeout. Control does not | |
1126 | return when it runs. | |
1127 | ||
1128 | Arguments: | |
1129 | check_sync if TRUE, check synchronization rules if global option is TRUE | |
1130 | ||
1131 | Returns: a code identifying the command (enumerated above) | |
1132 | */ | |
1133 | ||
1134 | static int | |
1135 | smtp_read_command(BOOL check_sync) | |
1136 | { | |
1137 | int c; | |
1138 | int ptr = 0; | |
1139 | smtp_cmd_list *p; | |
1140 | BOOL hadnull = FALSE; | |
1141 | ||
1142 | os_non_restarting_signal(SIGALRM, command_timeout_handler); | |
1143 | ||
1144 | while ((c = (receive_getc)()) != '\n' && c != EOF) | |
1145 | { | |
3ee512ff | 1146 | if (ptr >= smtp_cmd_buffer_size) |
059ec3d9 PH |
1147 | { |
1148 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
1149 | return OTHER_CMD; | |
1150 | } | |
1151 | if (c == 0) | |
1152 | { | |
1153 | hadnull = TRUE; | |
1154 | c = '?'; | |
1155 | } | |
3ee512ff | 1156 | smtp_cmd_buffer[ptr++] = c; |
059ec3d9 PH |
1157 | } |
1158 | ||
1159 | receive_linecount++; /* For BSMTP errors */ | |
1160 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
1161 | ||
1162 | /* If hit end of file, return pseudo EOF command. Whether we have a | |
1163 | part-line already read doesn't matter, since this is an error state. */ | |
1164 | ||
1165 | if (c == EOF) return EOF_CMD; | |
1166 | ||
1167 | /* Remove any CR and white space at the end of the line, and terminate the | |
1168 | string. */ | |
1169 | ||
3ee512ff PH |
1170 | while (ptr > 0 && isspace(smtp_cmd_buffer[ptr-1])) ptr--; |
1171 | smtp_cmd_buffer[ptr] = 0; | |
059ec3d9 | 1172 | |
3ee512ff | 1173 | DEBUG(D_receive) debug_printf("SMTP<< %s\n", smtp_cmd_buffer); |
059ec3d9 PH |
1174 | |
1175 | /* NULLs are not allowed in SMTP commands */ | |
1176 | ||
1177 | if (hadnull) return BADCHAR_CMD; | |
1178 | ||
1179 | /* Scan command list and return identity, having set the data pointer | |
1180 | to the start of the actual data characters. Check for SMTP synchronization | |
1181 | if required. */ | |
1182 | ||
1183 | for (p = cmd_list; p < cmd_list_end; p++) | |
1184 | { | |
cee5f132 | 1185 | #ifdef SUPPORT_PROXY |
a3c86431 TL |
1186 | /* Only allow QUIT command if Proxy Protocol parsing failed */ |
1187 | if (proxy_session && proxy_session_failed) | |
1188 | { | |
1189 | if (p->cmd != QUIT_CMD) | |
1190 | continue; | |
1191 | } | |
1192 | #endif | |
2f460950 JH |
1193 | if ( p->len |
1194 | && strncmpic(smtp_cmd_buffer, US p->name, p->len) == 0 | |
1195 | && ( smtp_cmd_buffer[p->len-1] == ':' /* "mail from:" or "rcpt to:" */ | |
1196 | || smtp_cmd_buffer[p->len] == 0 | |
1197 | || smtp_cmd_buffer[p->len] == ' ' | |
1198 | ) ) | |
059ec3d9 PH |
1199 | { |
1200 | if (smtp_inptr < smtp_inend && /* Outstanding input */ | |
1201 | p->cmd < sync_cmd_limit && /* Command should sync */ | |
1202 | check_sync && /* Local flag set */ | |
1203 | smtp_enforce_sync && /* Global flag set */ | |
1204 | sender_host_address != NULL && /* Not local input */ | |
1205 | !sender_host_notsocket) /* Really is a socket */ | |
1206 | return BADSYN_CMD; | |
1207 | ||
ca86f471 PH |
1208 | /* The variables $smtp_command and $smtp_command_argument point into the |
1209 | unmodified input buffer. A copy of the latter is taken for actual | |
1210 | processing, so that it can be chopped up into separate parts if necessary, | |
1211 | for example, when processing a MAIL command options such as SIZE that can | |
1212 | follow the sender address. */ | |
059ec3d9 | 1213 | |
3ee512ff | 1214 | smtp_cmd_argument = smtp_cmd_buffer + p->len; |
ca86f471 PH |
1215 | while (isspace(*smtp_cmd_argument)) smtp_cmd_argument++; |
1216 | Ustrcpy(smtp_data_buffer, smtp_cmd_argument); | |
1217 | smtp_cmd_data = smtp_data_buffer; | |
059ec3d9 PH |
1218 | |
1219 | /* Count non-mail commands from those hosts that are controlled in this | |
1220 | way. The default is all hosts. We don't waste effort checking the list | |
1221 | until we get a non-mail command, but then cache the result to save checking | |
1222 | again. If there's a DEFER while checking the host, assume it's in the list. | |
1223 | ||
1224 | Note that one instance of RSET, EHLO/HELO, and STARTTLS is allowed at the | |
1225 | start of each incoming message by fiddling with the value in the table. */ | |
1226 | ||
1227 | if (!p->is_mail_cmd) | |
1228 | { | |
1229 | if (count_nonmail == TRUE_UNSET) count_nonmail = | |
1230 | verify_check_host(&smtp_accept_max_nonmail_hosts) != FAIL; | |
1231 | if (count_nonmail && ++nonmail_command_count > smtp_accept_max_nonmail) | |
1232 | return TOO_MANY_NONMAIL_CMD; | |
1233 | } | |
1234 | ||
ca86f471 PH |
1235 | /* If there is data for a command that does not expect it, generate the |
1236 | error here. */ | |
059ec3d9 | 1237 | |
ca86f471 | 1238 | return (p->has_arg || *smtp_cmd_data == 0)? p->cmd : BADARG_CMD; |
059ec3d9 PH |
1239 | } |
1240 | } | |
1241 | ||
cee5f132 | 1242 | #ifdef SUPPORT_PROXY |
a3c86431 TL |
1243 | /* Only allow QUIT command if Proxy Protocol parsing failed */ |
1244 | if (proxy_session && proxy_session_failed) | |
1245 | return PROXY_FAIL_IGNORE_CMD; | |
1246 | #endif | |
1247 | ||
059ec3d9 PH |
1248 | /* Enforce synchronization for unknown commands */ |
1249 | ||
1250 | if (smtp_inptr < smtp_inend && /* Outstanding input */ | |
1251 | check_sync && /* Local flag set */ | |
1252 | smtp_enforce_sync && /* Global flag set */ | |
1253 | sender_host_address != NULL && /* Not local input */ | |
1254 | !sender_host_notsocket) /* Really is a socket */ | |
1255 | return BADSYN_CMD; | |
1256 | ||
1257 | return OTHER_CMD; | |
1258 | } | |
1259 | ||
1260 | ||
1261 | ||
a14e5636 PH |
1262 | /************************************************* |
1263 | * Recheck synchronization * | |
1264 | *************************************************/ | |
1265 | ||
1266 | /* Synchronization checks can never be perfect because a packet may be on its | |
1267 | way but not arrived when the check is done. Such checks can in any case only be | |
1268 | done when TLS is not in use. Normally, the checks happen when commands are | |
1269 | read: Exim ensures that there is no more input in the input buffer. In normal | |
1270 | cases, the response to the command will be fast, and there is no further check. | |
1271 | ||
1272 | However, for some commands an ACL is run, and that can include delays. In those | |
1273 | cases, it is useful to do another check on the input just before sending the | |
1274 | response. This also applies at the start of a connection. This function does | |
1275 | that check by means of the select() function, as long as the facility is not | |
1276 | disabled or inappropriate. A failure of select() is ignored. | |
1277 | ||
1278 | When there is unwanted input, we read it so that it appears in the log of the | |
1279 | error. | |
1280 | ||
1281 | Arguments: none | |
1282 | Returns: TRUE if all is well; FALSE if there is input pending | |
1283 | */ | |
1284 | ||
1285 | static BOOL | |
1286 | check_sync(void) | |
1287 | { | |
1288 | int fd, rc; | |
1289 | fd_set fds; | |
1290 | struct timeval tzero; | |
1291 | ||
1292 | if (!smtp_enforce_sync || sender_host_address == NULL || | |
817d9f57 | 1293 | sender_host_notsocket || tls_in.active >= 0) |
a14e5636 PH |
1294 | return TRUE; |
1295 | ||
1296 | fd = fileno(smtp_in); | |
1297 | FD_ZERO(&fds); | |
1298 | FD_SET(fd, &fds); | |
1299 | tzero.tv_sec = 0; | |
1300 | tzero.tv_usec = 0; | |
1301 | rc = select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tzero); | |
1302 | ||
1303 | if (rc <= 0) return TRUE; /* Not ready to read */ | |
1304 | rc = smtp_getc(); | |
1305 | if (rc < 0) return TRUE; /* End of file or error */ | |
1306 | ||
1307 | smtp_ungetc(rc); | |
1308 | rc = smtp_inend - smtp_inptr; | |
1309 | if (rc > 150) rc = 150; | |
1310 | smtp_inptr[rc] = 0; | |
1311 | return FALSE; | |
1312 | } | |
1313 | ||
1314 | ||
1315 | ||
059ec3d9 PH |
1316 | /************************************************* |
1317 | * Forced closedown of call * | |
1318 | *************************************************/ | |
1319 | ||
1320 | /* This function is called from log.c when Exim is dying because of a serious | |
1321 | disaster, and also from some other places. If an incoming non-batched SMTP | |
1322 | channel is open, it swallows the rest of the incoming message if in the DATA | |
1323 | phase, sends the reply string, and gives an error to all subsequent commands | |
1324 | except QUIT. The existence of an SMTP call is detected by the non-NULLness of | |
1325 | smtp_in. | |
1326 | ||
8f128379 PH |
1327 | Arguments: |
1328 | message SMTP reply string to send, excluding the code | |
1329 | ||
059ec3d9 PH |
1330 | Returns: nothing |
1331 | */ | |
1332 | ||
1333 | void | |
1334 | smtp_closedown(uschar *message) | |
1335 | { | |
1336 | if (smtp_in == NULL || smtp_batched_input) return; | |
1337 | receive_swallow_smtp(); | |
1338 | smtp_printf("421 %s\r\n", message); | |
1339 | ||
60d10ce7 | 1340 | for (;;) switch(smtp_read_command(FALSE)) |
059ec3d9 | 1341 | { |
60d10ce7 JH |
1342 | case EOF_CMD: |
1343 | return; | |
059ec3d9 | 1344 | |
60d10ce7 JH |
1345 | case QUIT_CMD: |
1346 | smtp_printf("221 %s closing connection\r\n", smtp_active_hostname); | |
1347 | mac_smtp_fflush(); | |
1348 | return; | |
059ec3d9 | 1349 | |
60d10ce7 JH |
1350 | case RSET_CMD: |
1351 | smtp_printf("250 Reset OK\r\n"); | |
1352 | break; | |
059ec3d9 | 1353 | |
60d10ce7 JH |
1354 | default: |
1355 | smtp_printf("421 %s\r\n", message); | |
1356 | break; | |
059ec3d9 PH |
1357 | } |
1358 | } | |
1359 | ||
1360 | ||
1361 | ||
1362 | ||
1363 | /************************************************* | |
1364 | * Set up connection info for logging * | |
1365 | *************************************************/ | |
1366 | ||
1367 | /* This function is called when logging information about an SMTP connection. | |
1368 | It sets up appropriate source information, depending on the type of connection. | |
dac79d3e PH |
1369 | If sender_fullhost is NULL, we are at a very early stage of the connection; |
1370 | just use the IP address. | |
059ec3d9 PH |
1371 | |
1372 | Argument: none | |
1373 | Returns: a string describing the connection | |
1374 | */ | |
1375 | ||
1376 | uschar * | |
1377 | smtp_get_connection_info(void) | |
1378 | { | |
dac79d3e PH |
1379 | uschar *hostname = (sender_fullhost == NULL)? |
1380 | sender_host_address : sender_fullhost; | |
1381 | ||
059ec3d9 | 1382 | if (host_checking) |
dac79d3e | 1383 | return string_sprintf("SMTP connection from %s", hostname); |
059ec3d9 PH |
1384 | |
1385 | if (sender_host_unknown || sender_host_notsocket) | |
1386 | return string_sprintf("SMTP connection from %s", sender_ident); | |
1387 | ||
1388 | if (is_inetd) | |
dac79d3e | 1389 | return string_sprintf("SMTP connection from %s (via inetd)", hostname); |
059ec3d9 | 1390 | |
6c6d6e48 | 1391 | if (LOGGING(incoming_interface) && interface_address != NULL) |
dac79d3e | 1392 | return string_sprintf("SMTP connection from %s I=[%s]:%d", hostname, |
059ec3d9 PH |
1393 | interface_address, interface_port); |
1394 | ||
dac79d3e | 1395 | return string_sprintf("SMTP connection from %s", hostname); |
059ec3d9 PH |
1396 | } |
1397 | ||
1398 | ||
1399 | ||
e45a1c37 | 1400 | #ifdef SUPPORT_TLS |
887291d2 JH |
1401 | /* Append TLS-related information to a log line |
1402 | ||
1403 | Arguments: | |
1404 | s String under construction: allocated string to extend, or NULL | |
1405 | sizep Pointer to current allocation size (update on return), or NULL | |
1406 | ptrp Pointer to index for new entries in string (update on return), or NULL | |
1407 | ||
1408 | Returns: Allocated string or NULL | |
1409 | */ | |
e45a1c37 JH |
1410 | static uschar * |
1411 | s_tlslog(uschar * s, int * sizep, int * ptrp) | |
1412 | { | |
1413 | int size = sizep ? *sizep : 0; | |
1414 | int ptr = ptrp ? *ptrp : 0; | |
1415 | ||
6c6d6e48 | 1416 | if (LOGGING(tls_cipher) && tls_in.cipher != NULL) |
e45a1c37 | 1417 | s = string_append(s, &size, &ptr, 2, US" X=", tls_in.cipher); |
6c6d6e48 | 1418 | if (LOGGING(tls_certificate_verified) && tls_in.cipher != NULL) |
e45a1c37 JH |
1419 | s = string_append(s, &size, &ptr, 2, US" CV=", |
1420 | tls_in.certificate_verified? "yes":"no"); | |
6c6d6e48 | 1421 | if (LOGGING(tls_peerdn) && tls_in.peerdn != NULL) |
e45a1c37 JH |
1422 | s = string_append(s, &size, &ptr, 3, US" DN=\"", |
1423 | string_printing(tls_in.peerdn), US"\""); | |
6c6d6e48 | 1424 | if (LOGGING(tls_sni) && tls_in.sni != NULL) |
e45a1c37 JH |
1425 | s = string_append(s, &size, &ptr, 3, US" SNI=\"", |
1426 | string_printing(tls_in.sni), US"\""); | |
1427 | ||
67d81c10 JH |
1428 | if (s) |
1429 | { | |
1430 | s[ptr] = '\0'; | |
1431 | if (sizep) *sizep = size; | |
1432 | if (ptrp) *ptrp = ptr; | |
1433 | } | |
e45a1c37 JH |
1434 | return s; |
1435 | } | |
1436 | #endif | |
1437 | ||
b4ed4da0 PH |
1438 | /************************************************* |
1439 | * Log lack of MAIL if so configured * | |
1440 | *************************************************/ | |
1441 | ||
1442 | /* This function is called when an SMTP session ends. If the log selector | |
1443 | smtp_no_mail is set, write a log line giving some details of what has happened | |
1444 | in the SMTP session. | |
1445 | ||
1446 | Arguments: none | |
1447 | Returns: nothing | |
1448 | */ | |
1449 | ||
1450 | void | |
1451 | smtp_log_no_mail(void) | |
1452 | { | |
1453 | int size, ptr, i; | |
1454 | uschar *s, *sep; | |
1455 | ||
6c6d6e48 | 1456 | if (smtp_mailcmd_count > 0 || !LOGGING(smtp_no_mail)) |
b4ed4da0 PH |
1457 | return; |
1458 | ||
1459 | s = NULL; | |
1460 | size = ptr = 0; | |
1461 | ||
1462 | if (sender_host_authenticated != NULL) | |
1463 | { | |
1464 | s = string_append(s, &size, &ptr, 2, US" A=", sender_host_authenticated); | |
1465 | if (authenticated_id != NULL) | |
1466 | s = string_append(s, &size, &ptr, 2, US":", authenticated_id); | |
1467 | } | |
1468 | ||
1469 | #ifdef SUPPORT_TLS | |
e45a1c37 | 1470 | s = s_tlslog(s, &size, &ptr); |
3f0945ff | 1471 | #endif |
b4ed4da0 PH |
1472 | |
1473 | sep = (smtp_connection_had[SMTP_HBUFF_SIZE-1] != SCH_NONE)? | |
1474 | US" C=..." : US" C="; | |
1475 | for (i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++) | |
1476 | { | |
1477 | if (smtp_connection_had[i] != SCH_NONE) | |
1478 | { | |
1479 | s = string_append(s, &size, &ptr, 2, sep, | |
1480 | smtp_names[smtp_connection_had[i]]); | |
1481 | sep = US","; | |
1482 | } | |
1483 | } | |
1484 | ||
1485 | for (i = 0; i < smtp_ch_index; i++) | |
1486 | { | |
1487 | s = string_append(s, &size, &ptr, 2, sep, smtp_names[smtp_connection_had[i]]); | |
1488 | sep = US","; | |
1489 | } | |
1490 | ||
1491 | if (s != NULL) s[ptr] = 0; else s = US""; | |
1492 | log_write(0, LOG_MAIN, "no MAIL in SMTP connection from %s D=%s%s", | |
1493 | host_and_ident(FALSE), | |
19050083 JH |
1494 | readconf_printtime( (int) ((long)time(NULL) - (long)smtp_connection_start)), |
1495 | s); | |
b4ed4da0 PH |
1496 | } |
1497 | ||
1498 | ||
1499 | ||
059ec3d9 PH |
1500 | /************************************************* |
1501 | * Check HELO line and set sender_helo_name * | |
1502 | *************************************************/ | |
1503 | ||
1504 | /* Check the format of a HELO line. The data for HELO/EHLO is supposed to be | |
1505 | the domain name of the sending host, or an ip literal in square brackets. The | |
1506 | arrgument is placed in sender_helo_name, which is in malloc store, because it | |
1507 | must persist over multiple incoming messages. If helo_accept_junk is set, this | |
1508 | host is permitted to send any old junk (needed for some broken hosts). | |
1509 | Otherwise, helo_allow_chars can be used for rogue characters in general | |
1510 | (typically people want to let in underscores). | |
1511 | ||
1512 | Argument: | |
1513 | s the data portion of the line (already past any white space) | |
1514 | ||
1515 | Returns: TRUE or FALSE | |
1516 | */ | |
1517 | ||
1518 | static BOOL | |
1519 | check_helo(uschar *s) | |
1520 | { | |
1521 | uschar *start = s; | |
1522 | uschar *end = s + Ustrlen(s); | |
1523 | BOOL yield = helo_accept_junk; | |
1524 | ||
1525 | /* Discard any previous helo name */ | |
1526 | ||
1527 | if (sender_helo_name != NULL) | |
1528 | { | |
1529 | store_free(sender_helo_name); | |
1530 | sender_helo_name = NULL; | |
1531 | } | |
1532 | ||
1533 | /* Skip tests if junk is permitted. */ | |
1534 | ||
1535 | if (!yield) | |
1536 | { | |
1537 | /* Allow the new standard form for IPv6 address literals, namely, | |
1538 | [IPv6:....], and because someone is bound to use it, allow an equivalent | |
1539 | IPv4 form. Allow plain addresses as well. */ | |
1540 | ||
1541 | if (*s == '[') | |
1542 | { | |
1543 | if (end[-1] == ']') | |
1544 | { | |
1545 | end[-1] = 0; | |
1546 | if (strncmpic(s, US"[IPv6:", 6) == 0) | |
1547 | yield = (string_is_ip_address(s+6, NULL) == 6); | |
1548 | else if (strncmpic(s, US"[IPv4:", 6) == 0) | |
1549 | yield = (string_is_ip_address(s+6, NULL) == 4); | |
1550 | else | |
1551 | yield = (string_is_ip_address(s+1, NULL) != 0); | |
1552 | end[-1] = ']'; | |
1553 | } | |
1554 | } | |
1555 | ||
1556 | /* Non-literals must be alpha, dot, hyphen, plus any non-valid chars | |
1557 | that have been configured (usually underscore - sigh). */ | |
1558 | ||
1559 | else if (*s != 0) | |
1560 | { | |
1561 | yield = TRUE; | |
1562 | while (*s != 0) | |
1563 | { | |
1564 | if (!isalnum(*s) && *s != '.' && *s != '-' && | |
1565 | Ustrchr(helo_allow_chars, *s) == NULL) | |
1566 | { | |
1567 | yield = FALSE; | |
1568 | break; | |
1569 | } | |
1570 | s++; | |
1571 | } | |
1572 | } | |
1573 | } | |
1574 | ||
1575 | /* Save argument if OK */ | |
1576 | ||
1577 | if (yield) sender_helo_name = string_copy_malloc(start); | |
1578 | return yield; | |
1579 | } | |
1580 | ||
1581 | ||
1582 | ||
1583 | ||
1584 | ||
1585 | /************************************************* | |
1586 | * Extract SMTP command option * | |
1587 | *************************************************/ | |
1588 | ||
ca86f471 | 1589 | /* This function picks the next option setting off the end of smtp_cmd_data. It |
059ec3d9 PH |
1590 | is called for MAIL FROM and RCPT TO commands, to pick off the optional ESMTP |
1591 | things that can appear there. | |
1592 | ||
1593 | Arguments: | |
1594 | name point this at the name | |
1595 | value point this at the data string | |
1596 | ||
1597 | Returns: TRUE if found an option | |
1598 | */ | |
1599 | ||
1600 | static BOOL | |
1601 | extract_option(uschar **name, uschar **value) | |
1602 | { | |
1603 | uschar *n; | |
ca86f471 | 1604 | uschar *v = smtp_cmd_data + Ustrlen(smtp_cmd_data) - 1; |
059ec3d9 PH |
1605 | while (isspace(*v)) v--; |
1606 | v[1] = 0; | |
ca86f471 | 1607 | while (v > smtp_cmd_data && *v != '=' && !isspace(*v)) v--; |
059ec3d9 PH |
1608 | |
1609 | n = v; | |
fd98a5c6 JH |
1610 | if (*v == '=') |
1611 | { | |
1612 | while(isalpha(n[-1])) n--; | |
1613 | /* RFC says SP, but TAB seen in wild and other major MTAs accept it */ | |
1614 | if (!isspace(n[-1])) return FALSE; | |
1615 | n[-1] = 0; | |
1616 | } | |
1617 | else | |
1618 | { | |
1619 | n++; | |
1620 | if (v == smtp_cmd_data) return FALSE; | |
1621 | } | |
059ec3d9 | 1622 | *v++ = 0; |
fd98a5c6 | 1623 | *name = n; |
059ec3d9 PH |
1624 | *value = v; |
1625 | return TRUE; | |
1626 | } | |
1627 | ||
1628 | ||
1629 | ||
1630 | ||
1631 | ||
059ec3d9 PH |
1632 | /************************************************* |
1633 | * Reset for new message * | |
1634 | *************************************************/ | |
1635 | ||
1636 | /* This function is called whenever the SMTP session is reset from | |
1637 | within either of the setup functions. | |
1638 | ||
1639 | Argument: the stacking pool storage reset point | |
1640 | Returns: nothing | |
1641 | */ | |
1642 | ||
1643 | static void | |
1644 | smtp_reset(void *reset_point) | |
1645 | { | |
059ec3d9 PH |
1646 | store_reset(reset_point); |
1647 | recipients_list = NULL; | |
1648 | rcpt_count = rcpt_defer_count = rcpt_fail_count = | |
1649 | raw_recipients_count = recipients_count = recipients_list_max = 0; | |
2e5b33cd | 1650 | cancel_cutthrough_connection("smtp reset"); |
2e0c1448 | 1651 | message_linecount = 0; |
059ec3d9 | 1652 | message_size = -1; |
71fafd95 | 1653 | acl_added_headers = NULL; |
e7568d51 | 1654 | acl_removed_headers = NULL; |
059ec3d9 | 1655 | queue_only_policy = FALSE; |
2679d413 PH |
1656 | rcpt_smtp_response = NULL; |
1657 | rcpt_smtp_response_same = TRUE; | |
1658 | rcpt_in_progress = FALSE; | |
69358f02 | 1659 | deliver_freeze = FALSE; /* Can be set by ACL */ |
6a3f1455 | 1660 | freeze_tell = freeze_tell_config; /* Can be set by ACL */ |
29aba418 | 1661 | fake_response = OK; /* Can be set by ACL */ |
6951ac6c | 1662 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
1663 | no_mbox_unspool = FALSE; /* Can be set by ACL */ |
1664 | #endif | |
69358f02 | 1665 | submission_mode = FALSE; /* Can be set by ACL */ |
f4ee74ac | 1666 | suppress_local_fixups = suppress_local_fixups_default; /* Can be set by ACL */ |
69358f02 PH |
1667 | active_local_from_check = local_from_check; /* Can be set by ACL */ |
1668 | active_local_sender_retain = local_sender_retain; /* Can be set by ACL */ | |
059ec3d9 | 1669 | sender_address = NULL; |
2fe1a124 | 1670 | submission_name = NULL; /* Can be set by ACL */ |
059ec3d9 PH |
1671 | raw_sender = NULL; /* After SMTP rewrite, before qualifying */ |
1672 | sender_address_unrewritten = NULL; /* Set only after verify rewrite */ | |
1673 | sender_verified_list = NULL; /* No senders verified */ | |
1674 | memset(sender_address_cache, 0, sizeof(sender_address_cache)); | |
1675 | memset(sender_domain_cache, 0, sizeof(sender_domain_cache)); | |
6c1c3d1d | 1676 | |
059ec3d9 | 1677 | authenticated_sender = NULL; |
8523533c TK |
1678 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
1679 | bmi_run = 0; | |
1680 | bmi_verdicts = NULL; | |
1681 | #endif | |
80a47a2c | 1682 | #ifndef DISABLE_DKIM |
9e5d6b55 | 1683 | dkim_signers = NULL; |
80a47a2c TK |
1684 | dkim_disable_verify = FALSE; |
1685 | dkim_collect_input = FALSE; | |
f7572e5a | 1686 | #endif |
aa368db3 JH |
1687 | dsn_ret = 0; |
1688 | dsn_envid = NULL; | |
1689 | #ifndef DISABLE_PRDR | |
1690 | prdr_requested = FALSE; | |
1691 | #endif | |
8523533c TK |
1692 | #ifdef EXPERIMENTAL_SPF |
1693 | spf_header_comment = NULL; | |
1694 | spf_received = NULL; | |
8e669ac1 | 1695 | spf_result = NULL; |
8523533c TK |
1696 | spf_smtp_comment = NULL; |
1697 | #endif | |
8c5d388a | 1698 | #ifdef SUPPORT_I18N |
d1a13eea JH |
1699 | message_smtputf8 = FALSE; |
1700 | #endif | |
059ec3d9 PH |
1701 | body_linecount = body_zerocount = 0; |
1702 | ||
870f6ba8 TF |
1703 | sender_rate = sender_rate_limit = sender_rate_period = NULL; |
1704 | ratelimiters_mail = NULL; /* Updated by ratelimit ACL condition */ | |
1705 | /* Note that ratelimiters_conn persists across resets. */ | |
1706 | ||
38a0a95f | 1707 | /* Reset message ACL variables */ |
47ca6d6c | 1708 | |
38a0a95f | 1709 | acl_var_m = NULL; |
059ec3d9 PH |
1710 | |
1711 | /* The message body variables use malloc store. They may be set if this is | |
1712 | not the first message in an SMTP session and the previous message caused them | |
1713 | to be referenced in an ACL. */ | |
1714 | ||
1715 | if (message_body != NULL) | |
1716 | { | |
1717 | store_free(message_body); | |
1718 | message_body = NULL; | |
1719 | } | |
1720 | ||
1721 | if (message_body_end != NULL) | |
1722 | { | |
1723 | store_free(message_body_end); | |
1724 | message_body_end = NULL; | |
1725 | } | |
1726 | ||
1727 | /* Warning log messages are also saved in malloc store. They are saved to avoid | |
1728 | repetition in the same message, but it seems right to repeat them for different | |
4e88a19f | 1729 | messages. */ |
059ec3d9 PH |
1730 | |
1731 | while (acl_warn_logged != NULL) | |
1732 | { | |
1733 | string_item *this = acl_warn_logged; | |
1734 | acl_warn_logged = acl_warn_logged->next; | |
1735 | store_free(this); | |
1736 | } | |
1737 | } | |
1738 | ||
1739 | ||
1740 | ||
1741 | ||
1742 | ||
1743 | /************************************************* | |
1744 | * Initialize for incoming batched SMTP message * | |
1745 | *************************************************/ | |
1746 | ||
1747 | /* This function is called from smtp_setup_msg() in the case when | |
1748 | smtp_batched_input is true. This happens when -bS is used to pass a whole batch | |
1749 | of messages in one file with SMTP commands between them. All errors must be | |
1750 | reported by sending a message, and only MAIL FROM, RCPT TO, and DATA are | |
1751 | relevant. After an error on a sender, or an invalid recipient, the remainder | |
1752 | of the message is skipped. The value of received_protocol is already set. | |
1753 | ||
1754 | Argument: none | |
1755 | Returns: > 0 message successfully started (reached DATA) | |
1756 | = 0 QUIT read or end of file reached | |
1757 | < 0 should not occur | |
1758 | */ | |
1759 | ||
1760 | static int | |
1761 | smtp_setup_batch_msg(void) | |
1762 | { | |
1763 | int done = 0; | |
1764 | void *reset_point = store_get(0); | |
1765 | ||
1766 | /* Save the line count at the start of each transaction - single commands | |
1767 | like HELO and RSET count as whole transactions. */ | |
1768 | ||
1769 | bsmtp_transaction_linecount = receive_linecount; | |
1770 | ||
1771 | if ((receive_feof)()) return 0; /* Treat EOF as QUIT */ | |
1772 | ||
1773 | smtp_reset(reset_point); /* Reset for start of message */ | |
1774 | ||
1775 | /* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE | |
1776 | value. The values are 2 larger than the required yield of the function. */ | |
1777 | ||
1778 | while (done <= 0) | |
1779 | { | |
1780 | uschar *errmess; | |
1781 | uschar *recipient = NULL; | |
1782 | int start, end, sender_domain, recipient_domain; | |
1783 | ||
1784 | switch(smtp_read_command(FALSE)) | |
1785 | { | |
1786 | /* The HELO/EHLO commands set sender_address_helo if they have | |
1787 | valid data; otherwise they are ignored, except that they do | |
1788 | a reset of the state. */ | |
1789 | ||
1790 | case HELO_CMD: | |
1791 | case EHLO_CMD: | |
1792 | ||
ca86f471 | 1793 | check_helo(smtp_cmd_data); |
059ec3d9 PH |
1794 | /* Fall through */ |
1795 | ||
1796 | case RSET_CMD: | |
1797 | smtp_reset(reset_point); | |
1798 | bsmtp_transaction_linecount = receive_linecount; | |
1799 | break; | |
1800 | ||
1801 | ||
1802 | /* The MAIL FROM command requires an address as an operand. All we | |
1803 | do here is to parse it for syntactic correctness. The form "<>" is | |
1804 | a special case which converts into an empty string. The start/end | |
1805 | pointers in the original are not used further for this address, as | |
1806 | it is the canonical extracted address which is all that is kept. */ | |
1807 | ||
1808 | case MAIL_CMD: | |
474f71bf | 1809 | smtp_mailcmd_count++; /* Count for no-mail log */ |
059ec3d9 PH |
1810 | if (sender_address != NULL) |
1811 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1812 | moan_smtp_batch(smtp_cmd_buffer, "503 Sender already given"); |
059ec3d9 | 1813 | |
ca86f471 | 1814 | if (smtp_cmd_data[0] == 0) |
059ec3d9 | 1815 | /* The function moan_smtp_batch() does not return. */ |
3ee512ff | 1816 | moan_smtp_batch(smtp_cmd_buffer, "501 MAIL FROM must have an address operand"); |
059ec3d9 PH |
1817 | |
1818 | /* Reset to start of message */ | |
1819 | ||
1820 | smtp_reset(reset_point); | |
1821 | ||
1822 | /* Apply SMTP rewrite */ | |
1823 | ||
1824 | raw_sender = ((rewrite_existflags & rewrite_smtp) != 0)? | |
ca86f471 PH |
1825 | rewrite_one(smtp_cmd_data, rewrite_smtp|rewrite_smtp_sender, NULL, FALSE, |
1826 | US"", global_rewrite_rules) : smtp_cmd_data; | |
059ec3d9 PH |
1827 | |
1828 | /* Extract the address; the TRUE flag allows <> as valid */ | |
1829 | ||
1830 | raw_sender = | |
1831 | parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain, | |
1832 | TRUE); | |
1833 | ||
1834 | if (raw_sender == NULL) | |
1835 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1836 | moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess); |
059ec3d9 PH |
1837 | |
1838 | sender_address = string_copy(raw_sender); | |
1839 | ||
1840 | /* Qualify unqualified sender addresses if permitted to do so. */ | |
1841 | ||
1842 | if (sender_domain == 0 && sender_address[0] != 0 && sender_address[0] != '@') | |
1843 | { | |
1844 | if (allow_unqualified_sender) | |
1845 | { | |
1846 | sender_address = rewrite_address_qualify(sender_address, FALSE); | |
1847 | DEBUG(D_receive) debug_printf("unqualified address %s accepted " | |
1848 | "and rewritten\n", raw_sender); | |
1849 | } | |
1850 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1851 | else moan_smtp_batch(smtp_cmd_buffer, "501 sender address must contain " |
059ec3d9 PH |
1852 | "a domain"); |
1853 | } | |
1854 | break; | |
1855 | ||
1856 | ||
1857 | /* The RCPT TO command requires an address as an operand. All we do | |
1858 | here is to parse it for syntactic correctness. There may be any number | |
1859 | of RCPT TO commands, specifying multiple senders. We build them all into | |
1860 | a data structure that is in argc/argv format. The start/end values | |
1861 | given by parse_extract_address are not used, as we keep only the | |
1862 | extracted address. */ | |
1863 | ||
1864 | case RCPT_CMD: | |
1865 | if (sender_address == NULL) | |
1866 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1867 | moan_smtp_batch(smtp_cmd_buffer, "503 No sender yet given"); |
059ec3d9 | 1868 | |
ca86f471 | 1869 | if (smtp_cmd_data[0] == 0) |
059ec3d9 | 1870 | /* The function moan_smtp_batch() does not return. */ |
3ee512ff | 1871 | moan_smtp_batch(smtp_cmd_buffer, "501 RCPT TO must have an address operand"); |
059ec3d9 PH |
1872 | |
1873 | /* Check maximum number allowed */ | |
1874 | ||
1875 | if (recipients_max > 0 && recipients_count + 1 > recipients_max) | |
1876 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1877 | moan_smtp_batch(smtp_cmd_buffer, "%s too many recipients", |
059ec3d9 PH |
1878 | recipients_max_reject? "552": "452"); |
1879 | ||
1880 | /* Apply SMTP rewrite, then extract address. Don't allow "<>" as a | |
1881 | recipient address */ | |
1882 | ||
2685d6e0 JH |
1883 | recipient = rewrite_existflags & rewrite_smtp |
1884 | ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"", | |
1885 | global_rewrite_rules) | |
1886 | : smtp_cmd_data; | |
059ec3d9 | 1887 | |
059ec3d9 PH |
1888 | recipient = parse_extract_address(recipient, &errmess, &start, &end, |
1889 | &recipient_domain, FALSE); | |
059ec3d9 | 1890 | |
2685d6e0 | 1891 | if (!recipient) |
059ec3d9 | 1892 | /* The function moan_smtp_batch() does not return. */ |
3ee512ff | 1893 | moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess); |
059ec3d9 PH |
1894 | |
1895 | /* If the recipient address is unqualified, qualify it if permitted. Then | |
1896 | add it to the list of recipients. */ | |
1897 | ||
1898 | if (recipient_domain == 0) | |
1899 | { | |
1900 | if (allow_unqualified_recipient) | |
1901 | { | |
1902 | DEBUG(D_receive) debug_printf("unqualified address %s accepted\n", | |
1903 | recipient); | |
1904 | recipient = rewrite_address_qualify(recipient, TRUE); | |
1905 | } | |
1906 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1907 | else moan_smtp_batch(smtp_cmd_buffer, "501 recipient address must contain " |
059ec3d9 PH |
1908 | "a domain"); |
1909 | } | |
1910 | receive_add_recipient(recipient, -1); | |
1911 | break; | |
1912 | ||
1913 | ||
1914 | /* The DATA command is legal only if it follows successful MAIL FROM | |
1915 | and RCPT TO commands. This function is complete when a valid DATA | |
1916 | command is encountered. */ | |
1917 | ||
1918 | case DATA_CMD: | |
1919 | if (sender_address == NULL || recipients_count <= 0) | |
1920 | { | |
1921 | /* The function moan_smtp_batch() does not return. */ | |
1922 | if (sender_address == NULL) | |
3ee512ff | 1923 | moan_smtp_batch(smtp_cmd_buffer, |
059ec3d9 PH |
1924 | "503 MAIL FROM:<sender> command must precede DATA"); |
1925 | else | |
3ee512ff | 1926 | moan_smtp_batch(smtp_cmd_buffer, |
059ec3d9 PH |
1927 | "503 RCPT TO:<recipient> must precede DATA"); |
1928 | } | |
1929 | else | |
1930 | { | |
1931 | done = 3; /* DATA successfully achieved */ | |
1932 | message_ended = END_NOTENDED; /* Indicate in middle of message */ | |
1933 | } | |
1934 | break; | |
1935 | ||
1936 | ||
1937 | /* The VRFY, EXPN, HELP, ETRN, and NOOP commands are ignored. */ | |
1938 | ||
1939 | case VRFY_CMD: | |
1940 | case EXPN_CMD: | |
1941 | case HELP_CMD: | |
1942 | case NOOP_CMD: | |
1943 | case ETRN_CMD: | |
1944 | bsmtp_transaction_linecount = receive_linecount; | |
1945 | break; | |
1946 | ||
1947 | ||
1948 | case EOF_CMD: | |
1949 | case QUIT_CMD: | |
1950 | done = 2; | |
1951 | break; | |
1952 | ||
1953 | ||
1954 | case BADARG_CMD: | |
1955 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1956 | moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected argument data"); |
059ec3d9 PH |
1957 | break; |
1958 | ||
1959 | ||
1960 | case BADCHAR_CMD: | |
1961 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1962 | moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected NULL in SMTP command"); |
059ec3d9 PH |
1963 | break; |
1964 | ||
1965 | ||
1966 | default: | |
1967 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1968 | moan_smtp_batch(smtp_cmd_buffer, "500 Command unrecognized"); |
059ec3d9 PH |
1969 | break; |
1970 | } | |
1971 | } | |
1972 | ||
1973 | return done - 2; /* Convert yield values */ | |
1974 | } | |
1975 | ||
1976 | ||
1977 | ||
1978 | ||
1979 | /************************************************* | |
1980 | * Start an SMTP session * | |
1981 | *************************************************/ | |
1982 | ||
1983 | /* This function is called at the start of an SMTP session. Thereafter, | |
1984 | smtp_setup_msg() is called to initiate each separate message. This | |
1985 | function does host-specific testing, and outputs the banner line. | |
1986 | ||
1987 | Arguments: none | |
1988 | Returns: FALSE if the session can not continue; something has | |
1989 | gone wrong, or the connection to the host is blocked | |
1990 | */ | |
1991 | ||
1992 | BOOL | |
1993 | smtp_start_session(void) | |
1994 | { | |
1995 | int size = 256; | |
4e88a19f PH |
1996 | int ptr, esclen; |
1997 | uschar *user_msg, *log_msg; | |
1998 | uschar *code, *esc; | |
059ec3d9 PH |
1999 | uschar *p, *s, *ss; |
2000 | ||
b4ed4da0 PH |
2001 | smtp_connection_start = time(NULL); |
2002 | for (smtp_ch_index = 0; smtp_ch_index < SMTP_HBUFF_SIZE; smtp_ch_index++) | |
2003 | smtp_connection_had[smtp_ch_index] = SCH_NONE; | |
2004 | smtp_ch_index = 0; | |
2005 | ||
00f00ca5 PH |
2006 | /* Default values for certain variables */ |
2007 | ||
059ec3d9 | 2008 | helo_seen = esmtp = helo_accept_junk = FALSE; |
b4ed4da0 | 2009 | smtp_mailcmd_count = 0; |
059ec3d9 PH |
2010 | count_nonmail = TRUE_UNSET; |
2011 | synprot_error_count = unknown_command_count = nonmail_command_count = 0; | |
2012 | smtp_delay_mail = smtp_rlm_base; | |
2013 | auth_advertised = FALSE; | |
2014 | pipelining_advertised = FALSE; | |
cf8b11a5 | 2015 | pipelining_enable = TRUE; |
059ec3d9 | 2016 | sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING; |
8f128379 | 2017 | smtp_exit_function_called = FALSE; /* For avoiding loop in not-quit exit */ |
059ec3d9 | 2018 | |
33d73e3b PH |
2019 | /* If receiving by -bs from a trusted user, or testing with -bh, we allow |
2020 | authentication settings from -oMaa to remain in force. */ | |
2021 | ||
2022 | if (!host_checking && !sender_host_notsocket) sender_host_authenticated = NULL; | |
059ec3d9 PH |
2023 | authenticated_by = NULL; |
2024 | ||
2025 | #ifdef SUPPORT_TLS | |
817d9f57 | 2026 | tls_in.cipher = tls_in.peerdn = NULL; |
9d1c15ef JH |
2027 | tls_in.ourcert = tls_in.peercert = NULL; |
2028 | tls_in.sni = NULL; | |
44662487 | 2029 | tls_in.ocsp = OCSP_NOT_REQ; |
059ec3d9 PH |
2030 | tls_advertised = FALSE; |
2031 | #endif | |
6c1c3d1d | 2032 | dsn_advertised = FALSE; |
8c5d388a | 2033 | #ifdef SUPPORT_I18N |
d1a13eea JH |
2034 | smtputf8_advertised = FALSE; |
2035 | #endif | |
059ec3d9 PH |
2036 | |
2037 | /* Reset ACL connection variables */ | |
2038 | ||
38a0a95f | 2039 | acl_var_c = NULL; |
059ec3d9 | 2040 | |
ca86f471 | 2041 | /* Allow for trailing 0 in the command and data buffers. */ |
3ee512ff | 2042 | |
40c90bca | 2043 | if (!(smtp_cmd_buffer = US malloc(2*smtp_cmd_buffer_size + 2))) |
059ec3d9 PH |
2044 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
2045 | "malloc() failed for SMTP command buffer"); | |
40c90bca | 2046 | |
2416c261 | 2047 | smtp_cmd_buffer[0] = 0; |
ca86f471 | 2048 | smtp_data_buffer = smtp_cmd_buffer + smtp_cmd_buffer_size + 1; |
059ec3d9 PH |
2049 | |
2050 | /* For batched input, the protocol setting can be overridden from the | |
2051 | command line by a trusted caller. */ | |
2052 | ||
2053 | if (smtp_batched_input) | |
2054 | { | |
40c90bca | 2055 | if (!received_protocol) received_protocol = US"local-bsmtp"; |
059ec3d9 PH |
2056 | } |
2057 | ||
2058 | /* For non-batched SMTP input, the protocol setting is forced here. It will be | |
2059 | reset later if any of EHLO/AUTH/STARTTLS are received. */ | |
2060 | ||
2061 | else | |
2062 | received_protocol = | |
e524074d | 2063 | (sender_host_address ? protocols : protocols_local) [pnormal]; |
059ec3d9 PH |
2064 | |
2065 | /* Set up the buffer for inputting using direct read() calls, and arrange to | |
2066 | call the local functions instead of the standard C ones. */ | |
2067 | ||
40c90bca | 2068 | if (!(smtp_inbuffer = (uschar *)malloc(in_buffer_size))) |
059ec3d9 | 2069 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "malloc() failed for SMTP input buffer"); |
40c90bca | 2070 | |
059ec3d9 | 2071 | receive_getc = smtp_getc; |
584e96c6 | 2072 | receive_get_cache = smtp_get_cache; |
059ec3d9 PH |
2073 | receive_ungetc = smtp_ungetc; |
2074 | receive_feof = smtp_feof; | |
2075 | receive_ferror = smtp_ferror; | |
58eb016e | 2076 | receive_smtp_buffered = smtp_buffered; |
059ec3d9 PH |
2077 | smtp_inptr = smtp_inend = smtp_inbuffer; |
2078 | smtp_had_eof = smtp_had_error = 0; | |
2079 | ||
2080 | /* Set up the message size limit; this may be host-specific */ | |
2081 | ||
d45b1de8 PH |
2082 | thismessage_size_limit = expand_string_integer(message_size_limit, TRUE); |
2083 | if (expand_string_message != NULL) | |
059ec3d9 PH |
2084 | { |
2085 | if (thismessage_size_limit == -1) | |
2086 | log_write(0, LOG_MAIN|LOG_PANIC, "unable to expand message_size_limit: " | |
2087 | "%s", expand_string_message); | |
2088 | else | |
2089 | log_write(0, LOG_MAIN|LOG_PANIC, "invalid message_size_limit: " | |
2090 | "%s", expand_string_message); | |
2091 | smtp_closedown(US"Temporary local problem - please try later"); | |
2092 | return FALSE; | |
2093 | } | |
2094 | ||
2095 | /* When a message is input locally via the -bs or -bS options, sender_host_ | |
2096 | unknown is set unless -oMa was used to force an IP address, in which case it | |
2097 | is checked like a real remote connection. When -bs is used from inetd, this | |
2098 | flag is not set, causing the sending host to be checked. The code that deals | |
2099 | with IP source routing (if configured) is never required for -bs or -bS and | |
2100 | the flag sender_host_notsocket is used to suppress it. | |
2101 | ||
2102 | If smtp_accept_max and smtp_accept_reserve are set, keep some connections in | |
2103 | reserve for certain hosts and/or networks. */ | |
2104 | ||
2105 | if (!sender_host_unknown) | |
2106 | { | |
2107 | int rc; | |
2108 | BOOL reserved_host = FALSE; | |
2109 | ||
2110 | /* Look up IP options (source routing info) on the socket if this is not an | |
2111 | -oMa "host", and if any are found, log them and drop the connection. | |
2112 | ||
2113 | Linux (and others now, see below) is different to everyone else, so there | |
2114 | has to be some conditional compilation here. Versions of Linux before 2.1.15 | |
2115 | used a structure whose name was "options". Somebody finally realized that | |
2116 | this name was silly, and it got changed to "ip_options". I use the | |
2117 | newer name here, but there is a fudge in the script that sets up os.h | |
2118 | to define a macro in older Linux systems. | |
2119 | ||
2120 | Sigh. Linux is a fast-moving target. Another generation of Linux uses | |
2121 | glibc 2, which has chosen ip_opts for the structure name. This is now | |
2122 | really a glibc thing rather than a Linux thing, so the condition name | |
2123 | has been changed to reflect this. It is relevant also to GNU/Hurd. | |
2124 | ||
2125 | Mac OS 10.x (Darwin) is like the later glibc versions, but without the | |
2126 | setting of the __GLIBC__ macro, so we can't detect it automatically. There's | |
2127 | a special macro defined in the os.h file. | |
2128 | ||
2129 | Some DGUX versions on older hardware appear not to support IP options at | |
2130 | all, so there is now a general macro which can be set to cut out this | |
2131 | support altogether. | |
2132 | ||
2133 | How to do this properly in IPv6 is not yet known. */ | |
2134 | ||
2135 | #if !HAVE_IPV6 && !defined(NO_IP_OPTIONS) | |
2136 | ||
2137 | #ifdef GLIBC_IP_OPTIONS | |
2138 | #if (!defined __GLIBC__) || (__GLIBC__ < 2) | |
2139 | #define OPTSTYLE 1 | |
2140 | #else | |
2141 | #define OPTSTYLE 2 | |
2142 | #endif | |
2143 | #elif defined DARWIN_IP_OPTIONS | |
2144 | #define OPTSTYLE 2 | |
2145 | #else | |
2146 | #define OPTSTYLE 3 | |
2147 | #endif | |
2148 | ||
2149 | if (!host_checking && !sender_host_notsocket) | |
2150 | { | |
2151 | #if OPTSTYLE == 1 | |
36a3b041 | 2152 | EXIM_SOCKLEN_T optlen = sizeof(struct ip_options) + MAX_IPOPTLEN; |
059ec3d9 PH |
2153 | struct ip_options *ipopt = store_get(optlen); |
2154 | #elif OPTSTYLE == 2 | |
2155 | struct ip_opts ipoptblock; | |
2156 | struct ip_opts *ipopt = &ipoptblock; | |
36a3b041 | 2157 | EXIM_SOCKLEN_T optlen = sizeof(ipoptblock); |
059ec3d9 PH |
2158 | #else |
2159 | struct ipoption ipoptblock; | |
2160 | struct ipoption *ipopt = &ipoptblock; | |
36a3b041 | 2161 | EXIM_SOCKLEN_T optlen = sizeof(ipoptblock); |
059ec3d9 PH |
2162 | #endif |
2163 | ||
2164 | /* Occasional genuine failures of getsockopt() have been seen - for | |
2165 | example, "reset by peer". Therefore, just log and give up on this | |
2166 | call, unless the error is ENOPROTOOPT. This error is given by systems | |
2167 | that have the interfaces but not the mechanism - e.g. GNU/Hurd at the time | |
2168 | of writing. So for that error, carry on - we just can't do an IP options | |
2169 | check. */ | |
2170 | ||
2171 | DEBUG(D_receive) debug_printf("checking for IP options\n"); | |
2172 | ||
2173 | if (getsockopt(fileno(smtp_out), IPPROTO_IP, IP_OPTIONS, (uschar *)(ipopt), | |
2174 | &optlen) < 0) | |
2175 | { | |
2176 | if (errno != ENOPROTOOPT) | |
2177 | { | |
2178 | log_write(0, LOG_MAIN, "getsockopt() failed from %s: %s", | |
2179 | host_and_ident(FALSE), strerror(errno)); | |
2180 | smtp_printf("451 SMTP service not available\r\n"); | |
2181 | return FALSE; | |
2182 | } | |
2183 | } | |
2184 | ||
2185 | /* Deal with any IP options that are set. On the systems I have looked at, | |
2186 | the value of MAX_IPOPTLEN has been 40, meaning that there should never be | |
2187 | more logging data than will fit in big_buffer. Nevertheless, after somebody | |
2188 | questioned this code, I've added in some paranoid checking. */ | |
2189 | ||
2190 | else if (optlen > 0) | |
2191 | { | |
2192 | uschar *p = big_buffer; | |
2193 | uschar *pend = big_buffer + big_buffer_size; | |
2194 | uschar *opt, *adptr; | |
2195 | int optcount; | |
2196 | struct in_addr addr; | |
2197 | ||
2198 | #if OPTSTYLE == 1 | |
2199 | uschar *optstart = (uschar *)(ipopt->__data); | |
2200 | #elif OPTSTYLE == 2 | |
2201 | uschar *optstart = (uschar *)(ipopt->ip_opts); | |
2202 | #else | |
2203 | uschar *optstart = (uschar *)(ipopt->ipopt_list); | |
2204 | #endif | |
2205 | ||
2206 | DEBUG(D_receive) debug_printf("IP options exist\n"); | |
2207 | ||
2208 | Ustrcpy(p, "IP options on incoming call:"); | |
2209 | p += Ustrlen(p); | |
2210 | ||
2211 | for (opt = optstart; opt != NULL && | |
2212 | opt < (uschar *)(ipopt) + optlen;) | |
2213 | { | |
2214 | switch (*opt) | |
2215 | { | |
2216 | case IPOPT_EOL: | |
2217 | opt = NULL; | |
2218 | break; | |
2219 | ||
2220 | case IPOPT_NOP: | |
2221 | opt++; | |
2222 | break; | |
2223 | ||
2224 | case IPOPT_SSRR: | |
2225 | case IPOPT_LSRR: | |
2226 | if (!string_format(p, pend-p, " %s [@%s", | |
2227 | (*opt == IPOPT_SSRR)? "SSRR" : "LSRR", | |
2228 | #if OPTSTYLE == 1 | |
2229 | inet_ntoa(*((struct in_addr *)(&(ipopt->faddr)))))) | |
2230 | #elif OPTSTYLE == 2 | |
2231 | inet_ntoa(ipopt->ip_dst))) | |
2232 | #else | |
2233 | inet_ntoa(ipopt->ipopt_dst))) | |
2234 | #endif | |
2235 | { | |
2236 | opt = NULL; | |
2237 | break; | |
2238 | } | |
2239 | ||
2240 | p += Ustrlen(p); | |
2241 | optcount = (opt[1] - 3) / sizeof(struct in_addr); | |
2242 | adptr = opt + 3; | |
2243 | while (optcount-- > 0) | |
2244 | { | |
2245 | memcpy(&addr, adptr, sizeof(addr)); | |
2246 | if (!string_format(p, pend - p - 1, "%s%s", | |
2247 | (optcount == 0)? ":" : "@", inet_ntoa(addr))) | |
2248 | { | |
2249 | opt = NULL; | |
2250 | break; | |
2251 | } | |
2252 | p += Ustrlen(p); | |
2253 | adptr += sizeof(struct in_addr); | |
2254 | } | |
2255 | *p++ = ']'; | |
2256 | opt += opt[1]; | |
2257 | break; | |
2258 | ||
2259 | default: | |
2260 | { | |
2261 | int i; | |
2262 | if (pend - p < 4 + 3*opt[1]) { opt = NULL; break; } | |
2263 | Ustrcat(p, "[ "); | |
2264 | p += 2; | |
2265 | for (i = 0; i < opt[1]; i++) | |
2266 | { | |
2267 | sprintf(CS p, "%2.2x ", opt[i]); | |
2268 | p += 3; | |
2269 | } | |
2270 | *p++ = ']'; | |
2271 | } | |
2272 | opt += opt[1]; | |
2273 | break; | |
2274 | } | |
2275 | } | |
2276 | ||
2277 | *p = 0; | |
2278 | log_write(0, LOG_MAIN, "%s", big_buffer); | |
2279 | ||
2280 | /* Refuse any call with IP options. This is what tcpwrappers 7.5 does. */ | |
2281 | ||
2282 | log_write(0, LOG_MAIN|LOG_REJECT, | |
2283 | "connection from %s refused (IP options)", host_and_ident(FALSE)); | |
2284 | ||
2285 | smtp_printf("554 SMTP service not available\r\n"); | |
2286 | return FALSE; | |
2287 | } | |
2288 | ||
2289 | /* Length of options = 0 => there are no options */ | |
2290 | ||
2291 | else DEBUG(D_receive) debug_printf("no IP options found\n"); | |
2292 | } | |
2293 | #endif /* HAVE_IPV6 && !defined(NO_IP_OPTIONS) */ | |
2294 | ||
2295 | /* Set keep-alive in socket options. The option is on by default. This | |
2296 | setting is an attempt to get rid of some hanging connections that stick in | |
2297 | read() when the remote end (usually a dialup) goes away. */ | |
2298 | ||
2299 | if (smtp_accept_keepalive && !sender_host_notsocket) | |
2300 | ip_keepalive(fileno(smtp_out), sender_host_address, FALSE); | |
2301 | ||
2302 | /* If the current host matches host_lookup, set the name by doing a | |
2303 | reverse lookup. On failure, sender_host_name will be NULL and | |
2304 | host_lookup_failed will be TRUE. This may or may not be serious - optional | |
2305 | checks later. */ | |
2306 | ||
2307 | if (verify_check_host(&host_lookup) == OK) | |
2308 | { | |
2309 | (void)host_name_lookup(); | |
2310 | host_build_sender_fullhost(); | |
2311 | } | |
2312 | ||
2313 | /* Delay this until we have the full name, if it is looked up. */ | |
2314 | ||
2315 | set_process_info("handling incoming connection from %s", | |
2316 | host_and_ident(FALSE)); | |
2317 | ||
1ad6489e JH |
2318 | /* Expand smtp_receive_timeout, if needed */ |
2319 | ||
2320 | if (smtp_receive_timeout_s) | |
2321 | { | |
2322 | uschar * exp; | |
2323 | if ( !(exp = expand_string(smtp_receive_timeout_s)) | |
2324 | || !(*exp) | |
2325 | || (smtp_receive_timeout = readconf_readtime(exp, 0, FALSE)) < 0 | |
2326 | ) | |
2327 | log_write(0, LOG_MAIN|LOG_PANIC, | |
2328 | "bad value for smtp_receive_timeout: '%s'", exp ? exp : US""); | |
2329 | } | |
2330 | ||
059ec3d9 PH |
2331 | /* Start up TLS if tls_on_connect is set. This is for supporting the legacy |
2332 | smtps port for use with older style SSL MTAs. */ | |
2333 | ||
2334 | #ifdef SUPPORT_TLS | |
817d9f57 | 2335 | if (tls_in.on_connect && tls_server_start(tls_require_ciphers) != OK) |
059ec3d9 PH |
2336 | return FALSE; |
2337 | #endif | |
2338 | ||
2339 | /* Test for explicit connection rejection */ | |
2340 | ||
2341 | if (verify_check_host(&host_reject_connection) == OK) | |
2342 | { | |
2343 | log_write(L_connection_reject, LOG_MAIN|LOG_REJECT, "refused connection " | |
2344 | "from %s (host_reject_connection)", host_and_ident(FALSE)); | |
2345 | smtp_printf("554 SMTP service not available\r\n"); | |
2346 | return FALSE; | |
2347 | } | |
2348 | ||
afb3eaaf PH |
2349 | /* Test with TCP Wrappers if so configured. There is a problem in that |
2350 | hosts_ctl() returns 0 (deny) under a number of system failure circumstances, | |
2351 | such as disks dying. In these cases, it is desirable to reject with a 4xx | |
2352 | error instead of a 5xx error. There isn't a "right" way to detect such | |
2353 | problems. The following kludge is used: errno is zeroed before calling | |
2354 | hosts_ctl(). If the result is "reject", a 5xx error is given only if the | |
2355 | value of errno is 0 or ENOENT (which happens if /etc/hosts.{allow,deny} does | |
2356 | not exist). */ | |
059ec3d9 PH |
2357 | |
2358 | #ifdef USE_TCP_WRAPPERS | |
afb3eaaf | 2359 | errno = 0; |
5dc43717 JJ |
2360 | tcp_wrappers_name = expand_string(tcp_wrappers_daemon_name); |
2361 | if (tcp_wrappers_name == NULL) | |
2362 | { | |
2363 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" " | |
2364 | "(tcp_wrappers_name) failed: %s", string_printing(tcp_wrappers_name), | |
2365 | expand_string_message); | |
2366 | } | |
2367 | if (!hosts_ctl(tcp_wrappers_name, | |
059ec3d9 PH |
2368 | (sender_host_name == NULL)? STRING_UNKNOWN : CS sender_host_name, |
2369 | (sender_host_address == NULL)? STRING_UNKNOWN : CS sender_host_address, | |
2370 | (sender_ident == NULL)? STRING_UNKNOWN : CS sender_ident)) | |
2371 | { | |
afb3eaaf PH |
2372 | if (errno == 0 || errno == ENOENT) |
2373 | { | |
2374 | HDEBUG(D_receive) debug_printf("tcp wrappers rejection\n"); | |
2375 | log_write(L_connection_reject, | |
2376 | LOG_MAIN|LOG_REJECT, "refused connection from %s " | |
2377 | "(tcp wrappers)", host_and_ident(FALSE)); | |
2378 | smtp_printf("554 SMTP service not available\r\n"); | |
2379 | } | |
2380 | else | |
2381 | { | |
2382 | int save_errno = errno; | |
2383 | HDEBUG(D_receive) debug_printf("tcp wrappers rejected with unexpected " | |
2384 | "errno value %d\n", save_errno); | |
2385 | log_write(L_connection_reject, | |
2386 | LOG_MAIN|LOG_REJECT, "temporarily refused connection from %s " | |
2387 | "(tcp wrappers errno=%d)", host_and_ident(FALSE), save_errno); | |
2388 | smtp_printf("451 Temporary local problem - please try later\r\n"); | |
2389 | } | |
059ec3d9 PH |
2390 | return FALSE; |
2391 | } | |
2392 | #endif | |
2393 | ||
b01dd148 PH |
2394 | /* Check for reserved slots. The value of smtp_accept_count has already been |
2395 | incremented to include this process. */ | |
059ec3d9 PH |
2396 | |
2397 | if (smtp_accept_max > 0 && | |
b01dd148 | 2398 | smtp_accept_count > smtp_accept_max - smtp_accept_reserve) |
059ec3d9 PH |
2399 | { |
2400 | if ((rc = verify_check_host(&smtp_reserve_hosts)) != OK) | |
2401 | { | |
2402 | log_write(L_connection_reject, | |
2403 | LOG_MAIN, "temporarily refused connection from %s: not in " | |
2404 | "reserve list: connected=%d max=%d reserve=%d%s", | |
b01dd148 | 2405 | host_and_ident(FALSE), smtp_accept_count - 1, smtp_accept_max, |
059ec3d9 PH |
2406 | smtp_accept_reserve, (rc == DEFER)? " (lookup deferred)" : ""); |
2407 | smtp_printf("421 %s: Too many concurrent SMTP connections; " | |
2408 | "please try again later\r\n", smtp_active_hostname); | |
2409 | return FALSE; | |
2410 | } | |
2411 | reserved_host = TRUE; | |
2412 | } | |
2413 | ||
2414 | /* If a load level above which only messages from reserved hosts are | |
2415 | accepted is set, check the load. For incoming calls via the daemon, the | |
2416 | check is done in the superior process if there are no reserved hosts, to | |
2417 | save a fork. In all cases, the load average will already be available | |
2418 | in a global variable at this point. */ | |
2419 | ||
2420 | if (smtp_load_reserve >= 0 && | |
2421 | load_average > smtp_load_reserve && | |
2422 | !reserved_host && | |
2423 | verify_check_host(&smtp_reserve_hosts) != OK) | |
2424 | { | |
2425 | log_write(L_connection_reject, | |
2426 | LOG_MAIN, "temporarily refused connection from %s: not in " | |
2427 | "reserve list and load average = %.2f", host_and_ident(FALSE), | |
2428 | (double)load_average/1000.0); | |
2429 | smtp_printf("421 %s: Too much load; please try again later\r\n", | |
2430 | smtp_active_hostname); | |
2431 | return FALSE; | |
2432 | } | |
2433 | ||
2434 | /* Determine whether unqualified senders or recipients are permitted | |
2435 | for this host. Unfortunately, we have to do this every time, in order to | |
2436 | set the flags so that they can be inspected when considering qualifying | |
2437 | addresses in the headers. For a site that permits no qualification, this | |
2438 | won't take long, however. */ | |
2439 | ||
2440 | allow_unqualified_sender = | |
2441 | verify_check_host(&sender_unqualified_hosts) == OK; | |
2442 | ||
2443 | allow_unqualified_recipient = | |
2444 | verify_check_host(&recipient_unqualified_hosts) == OK; | |
2445 | ||
2446 | /* Determine whether HELO/EHLO is required for this host. The requirement | |
2447 | can be hard or soft. */ | |
2448 | ||
2449 | helo_required = verify_check_host(&helo_verify_hosts) == OK; | |
2450 | if (!helo_required) | |
2451 | helo_verify = verify_check_host(&helo_try_verify_hosts) == OK; | |
2452 | ||
2453 | /* Determine whether this hosts is permitted to send syntactic junk | |
2454 | after a HELO or EHLO command. */ | |
2455 | ||
2456 | helo_accept_junk = verify_check_host(&helo_accept_junk_hosts) == OK; | |
2457 | } | |
2458 | ||
2459 | /* For batch SMTP input we are now done. */ | |
2460 | ||
2461 | if (smtp_batched_input) return TRUE; | |
2462 | ||
cee5f132 | 2463 | #ifdef SUPPORT_PROXY |
a3c86431 TL |
2464 | /* If valid Proxy Protocol source is connecting, set up session. |
2465 | * Failure will not allow any SMTP function other than QUIT. */ | |
2466 | proxy_session = FALSE; | |
2467 | proxy_session_failed = FALSE; | |
2468 | if (check_proxy_protocol_host()) | |
f267271d | 2469 | if (!setup_proxy_protocol_host()) |
a3c86431 TL |
2470 | { |
2471 | proxy_session_failed = TRUE; | |
2472 | DEBUG(D_receive) | |
2473 | debug_printf("Failure to extract proxied host, only QUIT allowed\n"); | |
2474 | } | |
2475 | else | |
2476 | { | |
2477 | sender_host_name = NULL; | |
2478 | (void)host_name_lookup(); | |
2479 | host_build_sender_fullhost(); | |
2480 | } | |
a3c86431 TL |
2481 | #endif |
2482 | ||
059ec3d9 PH |
2483 | /* Run the ACL if it exists */ |
2484 | ||
4e88a19f | 2485 | user_msg = NULL; |
3cc3f762 | 2486 | if (acl_smtp_connect) |
059ec3d9 PH |
2487 | { |
2488 | int rc; | |
3cc3f762 JH |
2489 | if ((rc = acl_check(ACL_WHERE_CONNECT, NULL, acl_smtp_connect, &user_msg, |
2490 | &log_msg)) != OK) | |
059ec3d9 | 2491 | { |
3cc3f762 | 2492 | (void) smtp_handle_acl_fail(ACL_WHERE_CONNECT, rc, user_msg, log_msg); |
059ec3d9 PH |
2493 | return FALSE; |
2494 | } | |
2495 | } | |
2496 | ||
2497 | /* Output the initial message for a two-way SMTP connection. It may contain | |
2498 | newlines, which then cause a multi-line response to be given. */ | |
2499 | ||
4e88a19f PH |
2500 | code = US"220"; /* Default status code */ |
2501 | esc = US""; /* Default extended status code */ | |
2502 | esclen = 0; /* Length of esc */ | |
2503 | ||
d4ff61d1 | 2504 | if (!user_msg) |
4e88a19f | 2505 | { |
d4ff61d1 | 2506 | if (!(s = expand_string(smtp_banner))) |
4e88a19f PH |
2507 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" (smtp_banner) " |
2508 | "failed: %s", smtp_banner, expand_string_message); | |
2509 | } | |
2510 | else | |
2511 | { | |
2512 | int codelen = 3; | |
2513 | s = user_msg; | |
4f6ae5c3 | 2514 | smtp_message_code(&code, &codelen, &s, NULL, TRUE); |
d6a96edc | 2515 | if (codelen > 4) |
4e88a19f PH |
2516 | { |
2517 | esc = code + 4; | |
2518 | esclen = codelen - 4; | |
2519 | } | |
2520 | } | |
059ec3d9 PH |
2521 | |
2522 | /* Remove any terminating newlines; might as well remove trailing space too */ | |
2523 | ||
2524 | p = s + Ustrlen(s); | |
2525 | while (p > s && isspace(p[-1])) p--; | |
2526 | *p = 0; | |
2527 | ||
2528 | /* It seems that CC:Mail is braindead, and assumes that the greeting message | |
2529 | is all contained in a single IP packet. The original code wrote out the | |
2530 | greeting using several calls to fprint/fputc, and on busy servers this could | |
2531 | cause it to be split over more than one packet - which caused CC:Mail to fall | |
2532 | over when it got the second part of the greeting after sending its first | |
2533 | command. Sigh. To try to avoid this, build the complete greeting message | |
2534 | first, and output it in one fell swoop. This gives a better chance of it | |
2535 | ending up as a single packet. */ | |
2536 | ||
2537 | ss = store_get(size); | |
2538 | ptr = 0; | |
2539 | ||
2540 | p = s; | |
2541 | do /* At least once, in case we have an empty string */ | |
2542 | { | |
2543 | int len; | |
2544 | uschar *linebreak = Ustrchr(p, '\n'); | |
c2f669a4 | 2545 | ss = string_catn(ss, &size, &ptr, code, 3); |
059ec3d9 PH |
2546 | if (linebreak == NULL) |
2547 | { | |
2548 | len = Ustrlen(p); | |
c2f669a4 | 2549 | ss = string_catn(ss, &size, &ptr, US" ", 1); |
059ec3d9 PH |
2550 | } |
2551 | else | |
2552 | { | |
2553 | len = linebreak - p; | |
c2f669a4 | 2554 | ss = string_catn(ss, &size, &ptr, US"-", 1); |
059ec3d9 | 2555 | } |
c2f669a4 JH |
2556 | ss = string_catn(ss, &size, &ptr, esc, esclen); |
2557 | ss = string_catn(ss, &size, &ptr, p, len); | |
2558 | ss = string_catn(ss, &size, &ptr, US"\r\n", 2); | |
059ec3d9 PH |
2559 | p += len; |
2560 | if (linebreak != NULL) p++; | |
2561 | } | |
2562 | while (*p != 0); | |
2563 | ||
2564 | ss[ptr] = 0; /* string_cat leaves room for this */ | |
2565 | ||
2566 | /* Before we write the banner, check that there is no input pending, unless | |
2567 | this synchronisation check is disabled. */ | |
2568 | ||
a14e5636 | 2569 | if (!check_sync()) |
059ec3d9 | 2570 | { |
a14e5636 PH |
2571 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol " |
2572 | "synchronization error (input sent without waiting for greeting): " | |
2573 | "rejected connection from %s input=\"%s\"", host_and_ident(TRUE), | |
2574 | string_printing(smtp_inptr)); | |
2575 | smtp_printf("554 SMTP synchronization error\r\n"); | |
2576 | return FALSE; | |
059ec3d9 PH |
2577 | } |
2578 | ||
2579 | /* Now output the banner */ | |
2580 | ||
2581 | smtp_printf("%s", ss); | |
2582 | return TRUE; | |
2583 | } | |
2584 | ||
2585 | ||
2586 | ||
2587 | ||
2588 | ||
2589 | /************************************************* | |
2590 | * Handle SMTP syntax and protocol errors * | |
2591 | *************************************************/ | |
2592 | ||
2593 | /* Write to the log for SMTP syntax errors in incoming commands, if configured | |
2594 | to do so. Then transmit the error response. The return value depends on the | |
2595 | number of syntax and protocol errors in this SMTP session. | |
2596 | ||
2597 | Arguments: | |
2598 | type error type, given as a log flag bit | |
2599 | code response code; <= 0 means don't send a response | |
2600 | data data to reflect in the response (can be NULL) | |
2601 | errmess the error message | |
2602 | ||
2603 | Returns: -1 limit of syntax/protocol errors NOT exceeded | |
2604 | +1 limit of syntax/protocol errors IS exceeded | |
2605 | ||
2606 | These values fit in with the values of the "done" variable in the main | |
2607 | processing loop in smtp_setup_msg(). */ | |
2608 | ||
2609 | static int | |
2610 | synprot_error(int type, int code, uschar *data, uschar *errmess) | |
2611 | { | |
2612 | int yield = -1; | |
2613 | ||
2614 | log_write(type, LOG_MAIN, "SMTP %s error in \"%s\" %s %s", | |
2615 | (type == L_smtp_syntax_error)? "syntax" : "protocol", | |
3ee512ff | 2616 | string_printing(smtp_cmd_buffer), host_and_ident(TRUE), errmess); |
059ec3d9 PH |
2617 | |
2618 | if (++synprot_error_count > smtp_max_synprot_errors) | |
2619 | { | |
2620 | yield = 1; | |
2621 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
2622 | "syntax or protocol errors (last command was \"%s\")", | |
0ebc4d69 | 2623 | host_and_ident(FALSE), string_printing(smtp_cmd_buffer)); |
059ec3d9 PH |
2624 | } |
2625 | ||
2626 | if (code > 0) | |
2627 | { | |
2628 | smtp_printf("%d%c%s%s%s\r\n", code, (yield == 1)? '-' : ' ', | |
2629 | (data == NULL)? US"" : data, (data == NULL)? US"" : US": ", errmess); | |
2630 | if (yield == 1) | |
2631 | smtp_printf("%d Too many syntax or protocol errors\r\n", code); | |
2632 | } | |
2633 | ||
2634 | return yield; | |
2635 | } | |
2636 | ||
2637 | ||
2638 | ||
2639 | ||
2640 | /************************************************* | |
2641 | * Log incomplete transactions * | |
2642 | *************************************************/ | |
2643 | ||
2644 | /* This function is called after a transaction has been aborted by RSET, QUIT, | |
2645 | connection drops or other errors. It logs the envelope information received | |
2646 | so far in order to preserve address verification attempts. | |
2647 | ||
2648 | Argument: string to indicate what aborted the transaction | |
2649 | Returns: nothing | |
2650 | */ | |
2651 | ||
2652 | static void | |
2653 | incomplete_transaction_log(uschar *what) | |
2654 | { | |
2655 | if (sender_address == NULL || /* No transaction in progress */ | |
6c6d6e48 TF |
2656 | !LOGGING(smtp_incomplete_transaction)) |
2657 | return; | |
059ec3d9 PH |
2658 | |
2659 | /* Build list of recipients for logging */ | |
2660 | ||
2661 | if (recipients_count > 0) | |
2662 | { | |
2663 | int i; | |
2664 | raw_recipients = store_get(recipients_count * sizeof(uschar *)); | |
2665 | for (i = 0; i < recipients_count; i++) | |
2666 | raw_recipients[i] = recipients_list[i].address; | |
2667 | raw_recipients_count = recipients_count; | |
2668 | } | |
2669 | ||
2670 | log_write(L_smtp_incomplete_transaction, LOG_MAIN|LOG_SENDER|LOG_RECIPIENTS, | |
2671 | "%s incomplete transaction (%s)", host_and_ident(TRUE), what); | |
2672 | } | |
2673 | ||
2674 | ||
2675 | ||
2676 | ||
2677 | /************************************************* | |
2678 | * Send SMTP response, possibly multiline * | |
2679 | *************************************************/ | |
2680 | ||
2681 | /* There are, it seems, broken clients out there that cannot handle multiline | |
2682 | responses. If no_multiline_responses is TRUE (it can be set from an ACL), we | |
2683 | output nothing for non-final calls, and only the first line for anything else. | |
2684 | ||
2685 | Arguments: | |
a5bd321b | 2686 | code SMTP code, may involve extended status codes |
d6a96edc | 2687 | codelen length of smtp code; if > 4 there's an ESC |
059ec3d9 PH |
2688 | final FALSE if the last line isn't the final line |
2689 | msg message text, possibly containing newlines | |
2690 | ||
2691 | Returns: nothing | |
2692 | */ | |
2693 | ||
2694 | void | |
a5bd321b | 2695 | smtp_respond(uschar* code, int codelen, BOOL final, uschar *msg) |
059ec3d9 | 2696 | { |
a5bd321b PH |
2697 | int esclen = 0; |
2698 | uschar *esc = US""; | |
2699 | ||
059ec3d9 PH |
2700 | if (!final && no_multiline_responses) return; |
2701 | ||
d6a96edc | 2702 | if (codelen > 4) |
a5bd321b PH |
2703 | { |
2704 | esc = code + 4; | |
2705 | esclen = codelen - 4; | |
2706 | } | |
2707 | ||
2679d413 PH |
2708 | /* If this is the first output for a (non-batch) RCPT command, see if all RCPTs |
2709 | have had the same. Note: this code is also present in smtp_printf(). It would | |
2710 | be tidier to have it only in one place, but when it was added, it was easier to | |
2711 | do it that way, so as not to have to mess with the code for the RCPT command, | |
2712 | which sometimes uses smtp_printf() and sometimes smtp_respond(). */ | |
2713 | ||
2714 | if (rcpt_in_progress) | |
2715 | { | |
2716 | if (rcpt_smtp_response == NULL) | |
2717 | rcpt_smtp_response = string_copy(msg); | |
2718 | else if (rcpt_smtp_response_same && | |
2719 | Ustrcmp(rcpt_smtp_response, msg) != 0) | |
2720 | rcpt_smtp_response_same = FALSE; | |
2721 | rcpt_in_progress = FALSE; | |
2722 | } | |
2723 | ||
2724 | /* Not output the message, splitting it up into multiple lines if necessary. */ | |
2725 | ||
059ec3d9 PH |
2726 | for (;;) |
2727 | { | |
2728 | uschar *nl = Ustrchr(msg, '\n'); | |
2729 | if (nl == NULL) | |
2730 | { | |
a5bd321b | 2731 | smtp_printf("%.3s%c%.*s%s\r\n", code, final? ' ':'-', esclen, esc, msg); |
059ec3d9 PH |
2732 | return; |
2733 | } | |
2734 | else if (nl[1] == 0 || no_multiline_responses) | |
2735 | { | |
a5bd321b PH |
2736 | smtp_printf("%.3s%c%.*s%.*s\r\n", code, final? ' ':'-', esclen, esc, |
2737 | (int)(nl - msg), msg); | |
059ec3d9 PH |
2738 | return; |
2739 | } | |
2740 | else | |
2741 | { | |
a5bd321b | 2742 | smtp_printf("%.3s-%.*s%.*s\r\n", code, esclen, esc, (int)(nl - msg), msg); |
059ec3d9 PH |
2743 | msg = nl + 1; |
2744 | while (isspace(*msg)) msg++; | |
2745 | } | |
2746 | } | |
2747 | } | |
2748 | ||
2749 | ||
2750 | ||
2751 | ||
4e88a19f PH |
2752 | /************************************************* |
2753 | * Parse user SMTP message * | |
2754 | *************************************************/ | |
2755 | ||
2756 | /* This function allows for user messages overriding the response code details | |
2757 | by providing a suitable response code string at the start of the message | |
2758 | user_msg. Check the message for starting with a response code and optionally an | |
2759 | extended status code. If found, check that the first digit is valid, and if so, | |
2760 | change the code pointer and length to use the replacement. An invalid code | |
2761 | causes a panic log; in this case, if the log messages is the same as the user | |
2762 | message, we must also adjust the value of the log message to show the code that | |
2763 | is actually going to be used (the original one). | |
2764 | ||
2765 | This function is global because it is called from receive.c as well as within | |
2766 | this module. | |
2767 | ||
d6a96edc PH |
2768 | Note that the code length returned includes the terminating whitespace |
2769 | character, which is always included in the regex match. | |
2770 | ||
4e88a19f PH |
2771 | Arguments: |
2772 | code SMTP code, may involve extended status codes | |
d6a96edc | 2773 | codelen length of smtp code; if > 4 there's an ESC |
4e88a19f PH |
2774 | msg message text |
2775 | log_msg optional log message, to be adjusted with the new SMTP code | |
4f6ae5c3 | 2776 | check_valid if true, verify the response code |
4e88a19f PH |
2777 | |
2778 | Returns: nothing | |
2779 | */ | |
2780 | ||
2781 | void | |
4f6ae5c3 JH |
2782 | smtp_message_code(uschar **code, int *codelen, uschar **msg, uschar **log_msg, |
2783 | BOOL check_valid) | |
4e88a19f PH |
2784 | { |
2785 | int n; | |
2786 | int ovector[3]; | |
2787 | ||
4f6ae5c3 | 2788 | if (!msg || !*msg) return; |
4e88a19f | 2789 | |
4f6ae5c3 JH |
2790 | if ((n = pcre_exec(regex_smtp_code, NULL, CS *msg, Ustrlen(*msg), 0, |
2791 | PCRE_EOPT, ovector, sizeof(ovector)/sizeof(int))) < 0) return; | |
4e88a19f | 2792 | |
4f6ae5c3 | 2793 | if (check_valid && (*msg)[0] != (*code)[0]) |
4e88a19f PH |
2794 | { |
2795 | log_write(0, LOG_MAIN|LOG_PANIC, "configured error code starts with " | |
2796 | "incorrect digit (expected %c) in \"%s\"", (*code)[0], *msg); | |
2797 | if (log_msg != NULL && *log_msg == *msg) | |
2798 | *log_msg = string_sprintf("%s %s", *code, *log_msg + ovector[1]); | |
2799 | } | |
2800 | else | |
2801 | { | |
2802 | *code = *msg; | |
2803 | *codelen = ovector[1]; /* Includes final space */ | |
2804 | } | |
2805 | *msg += ovector[1]; /* Chop the code off the message */ | |
2806 | return; | |
2807 | } | |
2808 | ||
2809 | ||
2810 | ||
2811 | ||
059ec3d9 PH |
2812 | /************************************************* |
2813 | * Handle an ACL failure * | |
2814 | *************************************************/ | |
2815 | ||
2816 | /* This function is called when acl_check() fails. As well as calls from within | |
2817 | this module, it is called from receive.c for an ACL after DATA. It sorts out | |
2818 | logging the incident, and sets up the error response. A message containing | |
2819 | newlines is turned into a multiline SMTP response, but for logging, only the | |
2820 | first line is used. | |
2821 | ||
a5bd321b PH |
2822 | There's a table of default permanent failure response codes to use in |
2823 | globals.c, along with the table of names. VFRY is special. Despite RFC1123 it | |
2824 | defaults disabled in Exim. However, discussion in connection with RFC 821bis | |
2825 | (aka RFC 2821) has concluded that the response should be 252 in the disabled | |
2826 | state, because there are broken clients that try VRFY before RCPT. A 5xx | |
2827 | response should be given only when the address is positively known to be | |
4f6ae5c3 JH |
2828 | undeliverable. Sigh. We return 252 if there is no VRFY ACL or it provides |
2829 | no explicit code, but if there is one we let it know best. | |
2830 | Also, for ETRN, 458 is given on refusal, and for AUTH, 503. | |
a5bd321b PH |
2831 | |
2832 | From Exim 4.63, it is possible to override the response code details by | |
2833 | providing a suitable response code string at the start of the message provided | |
2834 | in user_msg. The code's first digit is checked for validity. | |
059ec3d9 PH |
2835 | |
2836 | Arguments: | |
4f6ae5c3 JH |
2837 | where where the ACL was called from |
2838 | rc the failure code | |
2839 | user_msg a message that can be included in an SMTP response | |
2840 | log_msg a message for logging | |
059ec3d9 PH |
2841 | |
2842 | Returns: 0 in most cases | |
2843 | 2 if the failure code was FAIL_DROP, in which case the | |
2844 | SMTP connection should be dropped (this value fits with the | |
2845 | "done" variable in smtp_setup_msg() below) | |
2846 | */ | |
2847 | ||
2848 | int | |
2849 | smtp_handle_acl_fail(int where, int rc, uschar *user_msg, uschar *log_msg) | |
2850 | { | |
059ec3d9 | 2851 | BOOL drop = rc == FAIL_DROP; |
a5bd321b | 2852 | int codelen = 3; |
a5bd321b | 2853 | uschar *smtp_code; |
059ec3d9 PH |
2854 | uschar *lognl; |
2855 | uschar *sender_info = US""; | |
64ffc24f | 2856 | uschar *what = |
8523533c | 2857 | #ifdef WITH_CONTENT_SCAN |
3cc3f762 | 2858 | where == ACL_WHERE_MIME ? US"during MIME ACL checks" : |
8e669ac1 | 2859 | #endif |
3cc3f762 JH |
2860 | where == ACL_WHERE_PREDATA ? US"DATA" : |
2861 | where == ACL_WHERE_DATA ? US"after DATA" : | |
8ccd00b1 | 2862 | #ifndef DISABLE_PRDR |
3cc3f762 | 2863 | where == ACL_WHERE_PRDR ? US"after DATA PRDR" : |
fd98a5c6 | 2864 | #endif |
3cc3f762 JH |
2865 | smtp_cmd_data ? |
2866 | string_sprintf("%s %s", acl_wherenames[where], smtp_cmd_data) : | |
2867 | string_sprintf("%s in \"connect\" ACL", acl_wherenames[where]); | |
059ec3d9 PH |
2868 | |
2869 | if (drop) rc = FAIL; | |
2870 | ||
4e88a19f | 2871 | /* Set the default SMTP code, and allow a user message to change it. */ |
a5bd321b | 2872 | |
4f6ae5c3 JH |
2873 | smtp_code = rc == FAIL ? acl_wherecodes[where] : US"451"; |
2874 | smtp_message_code(&smtp_code, &codelen, &user_msg, &log_msg, | |
2875 | where != ACL_WHERE_VRFY); | |
a5bd321b | 2876 | |
059ec3d9 PH |
2877 | /* We used to have sender_address here; however, there was a bug that was not |
2878 | updating sender_address after a rewrite during a verify. When this bug was | |
2879 | fixed, sender_address at this point became the rewritten address. I'm not sure | |
2880 | this is what should be logged, so I've changed to logging the unrewritten | |
2881 | address to retain backward compatibility. */ | |
2882 | ||
8523533c | 2883 | #ifndef WITH_CONTENT_SCAN |
059ec3d9 | 2884 | if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA) |
8523533c TK |
2885 | #else |
2886 | if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA || where == ACL_WHERE_MIME) | |
2887 | #endif | |
059ec3d9 | 2888 | { |
b98bb9ac PP |
2889 | sender_info = string_sprintf("F=<%s>%s%s%s%s ", |
2890 | sender_address_unrewritten ? sender_address_unrewritten : sender_address, | |
2891 | sender_host_authenticated ? US" A=" : US"", | |
2892 | sender_host_authenticated ? sender_host_authenticated : US"", | |
2893 | sender_host_authenticated && authenticated_id ? US":" : US"", | |
2894 | sender_host_authenticated && authenticated_id ? authenticated_id : US"" | |
2895 | ); | |
059ec3d9 PH |
2896 | } |
2897 | ||
2898 | /* If there's been a sender verification failure with a specific message, and | |
2899 | we have not sent a response about it yet, do so now, as a preliminary line for | |
278c6e6c PH |
2900 | failures, but not defers. However, always log it for defer, and log it for fail |
2901 | unless the sender_verify_fail log selector has been turned off. */ | |
059ec3d9 PH |
2902 | |
2903 | if (sender_verified_failed != NULL && | |
2904 | !testflag(sender_verified_failed, af_sverify_told)) | |
2905 | { | |
2679d413 PH |
2906 | BOOL save_rcpt_in_progress = rcpt_in_progress; |
2907 | rcpt_in_progress = FALSE; /* So as not to treat these as the error */ | |
2908 | ||
059ec3d9 PH |
2909 | setflag(sender_verified_failed, af_sverify_told); |
2910 | ||
6c6d6e48 | 2911 | if (rc != FAIL || LOGGING(sender_verify_fail)) |
278c6e6c PH |
2912 | log_write(0, LOG_MAIN|LOG_REJECT, "%s sender verify %s for <%s>%s", |
2913 | host_and_ident(TRUE), | |
2914 | ((sender_verified_failed->special_action & 255) == DEFER)? "defer":"fail", | |
2915 | sender_verified_failed->address, | |
2916 | (sender_verified_failed->message == NULL)? US"" : | |
2917 | string_sprintf(": %s", sender_verified_failed->message)); | |
059ec3d9 PH |
2918 | |
2919 | if (rc == FAIL && sender_verified_failed->user_message != NULL) | |
a5bd321b | 2920 | smtp_respond(smtp_code, codelen, FALSE, string_sprintf( |
059ec3d9 PH |
2921 | testflag(sender_verified_failed, af_verify_pmfail)? |
2922 | "Postmaster verification failed while checking <%s>\n%s\n" | |
2923 | "Several RFCs state that you are required to have a postmaster\n" | |
2924 | "mailbox for each mail domain. This host does not accept mail\n" | |
2925 | "from domains whose servers reject the postmaster address." | |
2926 | : | |
2927 | testflag(sender_verified_failed, af_verify_nsfail)? | |
2928 | "Callback setup failed while verifying <%s>\n%s\n" | |
2929 | "The initial connection, or a HELO or MAIL FROM:<> command was\n" | |
2930 | "rejected. Refusing MAIL FROM:<> does not help fight spam, disregards\n" | |
2931 | "RFC requirements, and stops you from receiving standard bounce\n" | |
2932 | "messages. This host does not accept mail from domains whose servers\n" | |
2933 | "refuse bounces." | |
2934 | : | |
2935 | "Verification failed for <%s>\n%s", | |
2936 | sender_verified_failed->address, | |
2937 | sender_verified_failed->user_message)); | |
2679d413 PH |
2938 | |
2939 | rcpt_in_progress = save_rcpt_in_progress; | |
059ec3d9 PH |
2940 | } |
2941 | ||
2942 | /* Sort out text for logging */ | |
2943 | ||
3cc3f762 JH |
2944 | log_msg = log_msg ? string_sprintf(": %s", log_msg) : US""; |
2945 | if ((lognl = Ustrchr(log_msg, '\n'))) *lognl = 0; | |
059ec3d9 PH |
2946 | |
2947 | /* Send permanent failure response to the command, but the code used isn't | |
2948 | always a 5xx one - see comments at the start of this function. If the original | |
2949 | rc was FAIL_DROP we drop the connection and yield 2. */ | |
2950 | ||
ff5929e3 JH |
2951 | if (rc == FAIL) |
2952 | smtp_respond(smtp_code, codelen, TRUE, | |
2953 | user_msg ? user_msg : US"Administrative prohibition"); | |
059ec3d9 PH |
2954 | |
2955 | /* Send temporary failure response to the command. Don't give any details, | |
2956 | unless acl_temp_details is set. This is TRUE for a callout defer, a "defer" | |
2957 | verb, and for a header verify when smtp_return_error_details is set. | |
2958 | ||
2959 | This conditional logic is all somewhat of a mess because of the odd | |
2960 | interactions between temp_details and return_error_details. One day it should | |
2961 | be re-implemented in a tidier fashion. */ | |
2962 | ||
2963 | else | |
ff5929e3 | 2964 | if (acl_temp_details && user_msg) |
059ec3d9 | 2965 | { |
ff5929e3 JH |
2966 | if ( smtp_return_error_details |
2967 | && sender_verified_failed | |
2968 | && sender_verified_failed->message | |
2969 | ) | |
a5bd321b | 2970 | smtp_respond(smtp_code, codelen, FALSE, sender_verified_failed->message); |
ff5929e3 | 2971 | |
a5bd321b | 2972 | smtp_respond(smtp_code, codelen, TRUE, user_msg); |
059ec3d9 PH |
2973 | } |
2974 | else | |
a5bd321b PH |
2975 | smtp_respond(smtp_code, codelen, TRUE, |
2976 | US"Temporary local problem - please try later"); | |
059ec3d9 | 2977 | |
6ea85e9a PH |
2978 | /* Log the incident to the logs that are specified by log_reject_target |
2979 | (default main, reject). This can be empty to suppress logging of rejections. If | |
2980 | the connection is not forcibly to be dropped, return 0. Otherwise, log why it | |
2981 | is closing if required and return 2. */ | |
059ec3d9 | 2982 | |
6ea85e9a | 2983 | if (log_reject_target != 0) |
887291d2 | 2984 | { |
e45a1c37 | 2985 | #ifdef SUPPORT_TLS |
fc16abb4 JH |
2986 | uschar * tls = s_tlslog(NULL, NULL, NULL); |
2987 | if (!tls) tls = US""; | |
e45a1c37 | 2988 | #else |
fc16abb4 | 2989 | uschar * tls = US""; |
e45a1c37 | 2990 | #endif |
3cc3f762 JH |
2991 | log_write(where == ACL_WHERE_CONNECT ? L_connection_reject : 0, |
2992 | log_reject_target, "%s%s%s %s%srejected %s%s", | |
fc16abb4 JH |
2993 | LOGGING(dnssec) && sender_host_dnssec ? US" DS" : US"", |
2994 | host_and_ident(TRUE), | |
2995 | tls, | |
2996 | sender_info, | |
2997 | rc == FAIL ? US"" : US"temporarily ", | |
2998 | what, log_msg); | |
887291d2 | 2999 | } |
059ec3d9 PH |
3000 | |
3001 | if (!drop) return 0; | |
3002 | ||
3003 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by DROP in ACL", | |
3004 | smtp_get_connection_info()); | |
8f128379 PH |
3005 | |
3006 | /* Run the not-quit ACL, but without any custom messages. This should not be a | |
3007 | problem, because we get here only if some other ACL has issued "drop", and | |
3008 | in that case, *its* custom messages will have been used above. */ | |
3009 | ||
3010 | smtp_notquit_exit(US"acl-drop", NULL, NULL); | |
059ec3d9 PH |
3011 | return 2; |
3012 | } | |
3013 | ||
3014 | ||
3015 | ||
3016 | ||
8f128379 PH |
3017 | /************************************************* |
3018 | * Handle SMTP exit when QUIT is not given * | |
3019 | *************************************************/ | |
3020 | ||
3021 | /* This function provides a logging/statistics hook for when an SMTP connection | |
3022 | is dropped on the floor or the other end goes away. It's a global function | |
3023 | because it's called from receive.c as well as this module. As well as running | |
3024 | the NOTQUIT ACL, if there is one, this function also outputs a final SMTP | |
3025 | response, either with a custom message from the ACL, or using a default. There | |
3026 | is one case, however, when no message is output - after "drop". In that case, | |
3027 | the ACL that obeyed "drop" has already supplied the custom message, and NULL is | |
3028 | passed to this function. | |
3029 | ||
3030 | In case things go wrong while processing this function, causing an error that | |
3031 | may re-enter this funtion, there is a recursion check. | |
3032 | ||
3033 | Arguments: | |
3034 | reason What $smtp_notquit_reason will be set to in the ACL; | |
3035 | if NULL, the ACL is not run | |
3036 | code The error code to return as part of the response | |
3037 | defaultrespond The default message if there's no user_msg | |
3038 | ||
3039 | Returns: Nothing | |
3040 | */ | |
3041 | ||
3042 | void | |
3043 | smtp_notquit_exit(uschar *reason, uschar *code, uschar *defaultrespond, ...) | |
3044 | { | |
3045 | int rc; | |
3046 | uschar *user_msg = NULL; | |
3047 | uschar *log_msg = NULL; | |
3048 | ||
3049 | /* Check for recursive acll */ | |
3050 | ||
3051 | if (smtp_exit_function_called) | |
3052 | { | |
3053 | log_write(0, LOG_PANIC, "smtp_notquit_exit() called more than once (%s)", | |
3054 | reason); | |
3055 | return; | |
3056 | } | |
3057 | smtp_exit_function_called = TRUE; | |
3058 | ||
3059 | /* Call the not-QUIT ACL, if there is one, unless no reason is given. */ | |
3060 | ||
eea0defe | 3061 | if (acl_smtp_notquit && reason) |
8f128379 PH |
3062 | { |
3063 | smtp_notquit_reason = reason; | |
eea0defe JB |
3064 | if ((rc = acl_check(ACL_WHERE_NOTQUIT, NULL, acl_smtp_notquit, &user_msg, |
3065 | &log_msg)) == ERROR) | |
8f128379 PH |
3066 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL for not-QUIT returned ERROR: %s", |
3067 | log_msg); | |
3068 | } | |
3069 | ||
3070 | /* Write an SMTP response if we are expected to give one. As the default | |
3071 | responses are all internal, they should always fit in the buffer, but code a | |
3072 | warning, just in case. Note that string_vformat() still leaves a complete | |
3073 | string, even if it is incomplete. */ | |
3074 | ||
eea0defe | 3075 | if (code && defaultrespond) |
8f128379 | 3076 | { |
eea0defe JB |
3077 | if (user_msg) |
3078 | smtp_respond(code, 3, TRUE, user_msg); | |
3079 | else | |
8f128379 PH |
3080 | { |
3081 | uschar buffer[128]; | |
3082 | va_list ap; | |
3083 | va_start(ap, defaultrespond); | |
3084 | if (!string_vformat(buffer, sizeof(buffer), CS defaultrespond, ap)) | |
3085 | log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_notquit_exit()"); | |
3086 | smtp_printf("%s %s\r\n", code, buffer); | |
3087 | va_end(ap); | |
3088 | } | |
8f128379 PH |
3089 | mac_smtp_fflush(); |
3090 | } | |
3091 | } | |
3092 | ||
3093 | ||
3094 | ||
3095 | ||
d7b47fd0 PH |
3096 | /************************************************* |
3097 | * Verify HELO argument * | |
3098 | *************************************************/ | |
3099 | ||
3100 | /* This function is called if helo_verify_hosts or helo_try_verify_hosts is | |
3101 | matched. It is also called from ACL processing if verify = helo is used and | |
3102 | verification was not previously tried (i.e. helo_try_verify_hosts was not | |
3103 | matched). The result of its processing is to set helo_verified and | |
3104 | helo_verify_failed. These variables should both be FALSE for this function to | |
3105 | be called. | |
3106 | ||
3107 | Note that EHLO/HELO is legitimately allowed to quote an address literal. Allow | |
3108 | for IPv6 ::ffff: literals. | |
3109 | ||
3110 | Argument: none | |
3111 | Returns: TRUE if testing was completed; | |
3112 | FALSE on a temporary failure | |
3113 | */ | |
3114 | ||
3115 | BOOL | |
3116 | smtp_verify_helo(void) | |
3117 | { | |
3118 | BOOL yield = TRUE; | |
3119 | ||
3120 | HDEBUG(D_receive) debug_printf("verifying EHLO/HELO argument \"%s\"\n", | |
3121 | sender_helo_name); | |
3122 | ||
3123 | if (sender_helo_name == NULL) | |
3124 | { | |
3125 | HDEBUG(D_receive) debug_printf("no EHLO/HELO command was issued\n"); | |
3126 | } | |
3127 | ||
d1d5595c PH |
3128 | /* Deal with the case of -bs without an IP address */ |
3129 | ||
3130 | else if (sender_host_address == NULL) | |
3131 | { | |
3132 | HDEBUG(D_receive) debug_printf("no client IP address: assume success\n"); | |
3133 | helo_verified = TRUE; | |
3134 | } | |
3135 | ||
3136 | /* Deal with the more common case when there is a sending IP address */ | |
3137 | ||
d7b47fd0 PH |
3138 | else if (sender_helo_name[0] == '[') |
3139 | { | |
3140 | helo_verified = Ustrncmp(sender_helo_name+1, sender_host_address, | |
3141 | Ustrlen(sender_host_address)) == 0; | |
3142 | ||
3143 | #if HAVE_IPV6 | |
3144 | if (!helo_verified) | |
3145 | { | |
3146 | if (strncmpic(sender_host_address, US"::ffff:", 7) == 0) | |
3147 | helo_verified = Ustrncmp(sender_helo_name + 1, | |
3148 | sender_host_address + 7, Ustrlen(sender_host_address) - 7) == 0; | |
3149 | } | |
3150 | #endif | |
3151 | ||
3152 | HDEBUG(D_receive) | |
3153 | { if (helo_verified) debug_printf("matched host address\n"); } | |
3154 | } | |
3155 | ||
3156 | /* Do a reverse lookup if one hasn't already given a positive or negative | |
3157 | response. If that fails, or the name doesn't match, try checking with a forward | |
3158 | lookup. */ | |
3159 | ||
3160 | else | |
3161 | { | |
3162 | if (sender_host_name == NULL && !host_lookup_failed) | |
3163 | yield = host_name_lookup() != DEFER; | |
3164 | ||
3165 | /* If a host name is known, check it and all its aliases. */ | |
3166 | ||
1705dd20 JH |
3167 | if (sender_host_name) |
3168 | if ((helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0)) | |
d7b47fd0 | 3169 | { |
1705dd20 | 3170 | sender_helo_dnssec = sender_host_dnssec; |
d7b47fd0 PH |
3171 | HDEBUG(D_receive) debug_printf("matched host name\n"); |
3172 | } | |
3173 | else | |
3174 | { | |
3175 | uschar **aliases = sender_host_aliases; | |
1705dd20 JH |
3176 | while (*aliases) |
3177 | if ((helo_verified = strcmpic(*aliases++, sender_helo_name) == 0)) | |
3178 | { | |
3179 | sender_helo_dnssec = sender_host_dnssec; | |
3180 | break; | |
3181 | } | |
3182 | ||
3183 | HDEBUG(D_receive) if (helo_verified) | |
d7b47fd0 | 3184 | debug_printf("matched alias %s\n", *(--aliases)); |
d7b47fd0 | 3185 | } |
d7b47fd0 PH |
3186 | |
3187 | /* Final attempt: try a forward lookup of the helo name */ | |
3188 | ||
3189 | if (!helo_verified) | |
3190 | { | |
3191 | int rc; | |
3192 | host_item h; | |
1705dd20 JH |
3193 | dnssec_domains d; |
3194 | host_item *hh; | |
3195 | ||
d7b47fd0 PH |
3196 | h.name = sender_helo_name; |
3197 | h.address = NULL; | |
3198 | h.mx = MX_NONE; | |
3199 | h.next = NULL; | |
1705dd20 JH |
3200 | d.request = US"*"; |
3201 | d.require = US""; | |
3202 | ||
d7b47fd0 PH |
3203 | HDEBUG(D_receive) debug_printf("getting IP address for %s\n", |
3204 | sender_helo_name); | |
1705dd20 JH |
3205 | rc = host_find_bydns(&h, NULL, HOST_FIND_BY_A, |
3206 | NULL, NULL, NULL, &d, NULL, NULL); | |
d7b47fd0 | 3207 | if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL) |
1705dd20 | 3208 | for (hh = &h; hh; hh = hh->next) |
d7b47fd0 PH |
3209 | if (Ustrcmp(hh->address, sender_host_address) == 0) |
3210 | { | |
3211 | helo_verified = TRUE; | |
1705dd20 | 3212 | if (h.dnssec == DS_YES) sender_helo_dnssec = TRUE; |
d7b47fd0 | 3213 | HDEBUG(D_receive) |
1705dd20 JH |
3214 | { |
3215 | debug_printf("IP address for %s matches calling address\n" | |
3216 | "Forward DNS security status: %sverified\n", | |
3217 | sender_helo_name, sender_helo_dnssec ? "" : "un"); | |
3218 | } | |
d7b47fd0 PH |
3219 | break; |
3220 | } | |
d7b47fd0 PH |
3221 | } |
3222 | } | |
3223 | ||
d1d5595c | 3224 | if (!helo_verified) helo_verify_failed = TRUE; /* We've tried ... */ |
d7b47fd0 PH |
3225 | return yield; |
3226 | } | |
3227 | ||
3228 | ||
3229 | ||
3230 | ||
4e88a19f PH |
3231 | /************************************************* |
3232 | * Send user response message * | |
3233 | *************************************************/ | |
3234 | ||
3235 | /* This function is passed a default response code and a user message. It calls | |
3236 | smtp_message_code() to check and possibly modify the response code, and then | |
3237 | calls smtp_respond() to transmit the response. I put this into a function | |
3238 | just to avoid a lot of repetition. | |
3239 | ||
3240 | Arguments: | |
3241 | code the response code | |
3242 | user_msg the user message | |
3243 | ||
3244 | Returns: nothing | |
3245 | */ | |
3246 | ||
3247 | static void | |
3248 | smtp_user_msg(uschar *code, uschar *user_msg) | |
3249 | { | |
3250 | int len = 3; | |
4f6ae5c3 | 3251 | smtp_message_code(&code, &len, &user_msg, NULL, TRUE); |
4e88a19f PH |
3252 | smtp_respond(code, len, TRUE, user_msg); |
3253 | } | |
3254 | ||
3255 | ||
3256 | ||
b3ef41c9 JH |
3257 | static int |
3258 | smtp_in_auth(auth_instance *au, uschar ** s, uschar ** ss) | |
3259 | { | |
3260 | const uschar *set_id = NULL; | |
3261 | int rc, i; | |
3262 | ||
3263 | /* Run the checking code, passing the remainder of the command line as | |
3264 | data. Initials the $auth<n> variables as empty. Initialize $0 empty and set | |
3265 | it as the only set numerical variable. The authenticator may set $auth<n> | |
3266 | and also set other numeric variables. The $auth<n> variables are preferred | |
3267 | nowadays; the numerical variables remain for backwards compatibility. | |
3268 | ||
3269 | Afterwards, have a go at expanding the set_id string, even if | |
3270 | authentication failed - for bad passwords it can be useful to log the | |
3271 | userid. On success, require set_id to expand and exist, and put it in | |
3272 | authenticated_id. Save this in permanent store, as the working store gets | |
3273 | reset at HELO, RSET, etc. */ | |
3274 | ||
3275 | for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; | |
3276 | expand_nmax = 0; | |
3277 | expand_nlength[0] = 0; /* $0 contains nothing */ | |
3278 | ||
3279 | rc = (au->info->servercode)(au, smtp_cmd_data); | |
3280 | if (au->set_id) set_id = expand_string(au->set_id); | |
3281 | expand_nmax = -1; /* Reset numeric variables */ | |
3282 | for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; /* Reset $auth<n> */ | |
3283 | ||
3284 | /* The value of authenticated_id is stored in the spool file and printed in | |
3285 | log lines. It must not contain binary zeros or newline characters. In | |
3286 | normal use, it never will, but when playing around or testing, this error | |
3287 | can (did) happen. To guard against this, ensure that the id contains only | |
3288 | printing characters. */ | |
3289 | ||
3290 | if (set_id) set_id = string_printing(set_id); | |
3291 | ||
3292 | /* For the non-OK cases, set up additional logging data if set_id | |
3293 | is not empty. */ | |
3294 | ||
3295 | if (rc != OK) | |
3296 | set_id = set_id && *set_id | |
3297 | ? string_sprintf(" (set_id=%s)", set_id) : US""; | |
3298 | ||
3299 | /* Switch on the result */ | |
3300 | ||
3301 | switch(rc) | |
3302 | { | |
3303 | case OK: | |
3304 | if (!au->set_id || set_id) /* Complete success */ | |
3305 | { | |
3306 | if (set_id) authenticated_id = string_copy_malloc(set_id); | |
3307 | sender_host_authenticated = au->name; | |
3308 | authentication_failed = FALSE; | |
3309 | authenticated_fail_id = NULL; /* Impossible to already be set? */ | |
3310 | ||
3311 | received_protocol = | |
3312 | (sender_host_address ? protocols : protocols_local) | |
3313 | [pextend + pauthed + (tls_in.active >= 0 ? pcrpted:0)]; | |
3314 | *s = *ss = US"235 Authentication succeeded"; | |
3315 | authenticated_by = au; | |
3316 | break; | |
3317 | } | |
3318 | ||
3319 | /* Authentication succeeded, but we failed to expand the set_id string. | |
3320 | Treat this as a temporary error. */ | |
3321 | ||
3322 | auth_defer_msg = expand_string_message; | |
3323 | /* Fall through */ | |
3324 | ||
3325 | case DEFER: | |
3326 | if (set_id) authenticated_fail_id = string_copy_malloc(set_id); | |
3327 | *s = string_sprintf("435 Unable to authenticate at present%s", | |
3328 | auth_defer_user_msg); | |
3329 | *ss = string_sprintf("435 Unable to authenticate at present%s: %s", | |
3330 | set_id, auth_defer_msg); | |
3331 | break; | |
3332 | ||
3333 | case BAD64: | |
3334 | *s = *ss = US"501 Invalid base64 data"; | |
3335 | break; | |
3336 | ||
3337 | case CANCELLED: | |
3338 | *s = *ss = US"501 Authentication cancelled"; | |
3339 | break; | |
3340 | ||
3341 | case UNEXPECTED: | |
3342 | *s = *ss = US"553 Initial data not expected"; | |
3343 | break; | |
3344 | ||
3345 | case FAIL: | |
3346 | if (set_id) authenticated_fail_id = string_copy_malloc(set_id); | |
3347 | *s = US"535 Incorrect authentication data"; | |
3348 | *ss = string_sprintf("535 Incorrect authentication data%s", set_id); | |
3349 | break; | |
3350 | ||
3351 | default: | |
3352 | if (set_id) authenticated_fail_id = string_copy_malloc(set_id); | |
3353 | *s = US"435 Internal error"; | |
3354 | *ss = string_sprintf("435 Internal error%s: return %d from authentication " | |
3355 | "check", set_id, rc); | |
3356 | break; | |
3357 | } | |
3358 | ||
3359 | return rc; | |
3360 | } | |
3361 | ||
3362 | ||
3363 | ||
2685d6e0 JH |
3364 | |
3365 | ||
3366 | static int | |
3367 | qualify_recipient(uschar ** recipient, uschar * smtp_cmd_data, uschar * tag) | |
3368 | { | |
3369 | int rd; | |
3370 | if (allow_unqualified_recipient || strcmpic(*recipient, US"postmaster") == 0) | |
3371 | { | |
3372 | DEBUG(D_receive) debug_printf("unqualified address %s accepted\n", | |
3373 | *recipient); | |
3374 | rd = Ustrlen(recipient) + 1; | |
3375 | *recipient = rewrite_address_qualify(*recipient, TRUE); | |
3376 | return rd; | |
3377 | } | |
3378 | smtp_printf("501 %s: recipient address must contain a domain\r\n", | |
3379 | smtp_cmd_data); | |
3380 | log_write(L_smtp_syntax_error, | |
3381 | LOG_MAIN|LOG_REJECT, "unqualified %s rejected: <%s> %s%s", | |
3382 | tag, *recipient, host_and_ident(TRUE), host_lookup_msg); | |
3383 | return 0; | |
3384 | } | |
3385 | ||
3386 | ||
3387 | ||
3388 | ||
7e3ce68e JH |
3389 | static void |
3390 | smtp_quit_handler(uschar ** user_msgp, uschar ** log_msgp) | |
3391 | { | |
3392 | HAD(SCH_QUIT); | |
3393 | incomplete_transaction_log(US"QUIT"); | |
60d10ce7 | 3394 | if (acl_smtp_quit) |
7e3ce68e JH |
3395 | { |
3396 | int rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, user_msgp, log_msgp); | |
3397 | if (rc == ERROR) | |
3398 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s", | |
3399 | *log_msgp); | |
3400 | } | |
3401 | if (*user_msgp) | |
3402 | smtp_respond(US"221", 3, TRUE, *user_msgp); | |
3403 | else | |
3404 | smtp_printf("221 %s closing connection\r\n", smtp_active_hostname); | |
3405 | ||
3406 | #ifdef SUPPORT_TLS | |
3407 | tls_close(TRUE, TRUE); | |
3408 | #endif | |
3409 | ||
3410 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT", | |
3411 | smtp_get_connection_info()); | |
3412 | } | |
3413 | ||
3414 | ||
3415 | static void | |
3416 | smtp_rset_handler(void) | |
3417 | { | |
3418 | HAD(SCH_RSET); | |
3419 | incomplete_transaction_log(US"RSET"); | |
3420 | smtp_printf("250 Reset OK\r\n"); | |
3421 | cmd_list[CMD_LIST_RSET].is_mail_cmd = FALSE; | |
3422 | } | |
3423 | ||
3424 | ||
3425 | ||
059ec3d9 PH |
3426 | /************************************************* |
3427 | * Initialize for SMTP incoming message * | |
3428 | *************************************************/ | |
3429 | ||
3430 | /* This function conducts the initial dialogue at the start of an incoming SMTP | |
3431 | message, and builds a list of recipients. However, if the incoming message | |
3432 | is part of a batch (-bS option) a separate function is called since it would | |
3433 | be messy having tests splattered about all over this function. This function | |
3434 | therefore handles the case where interaction is occurring. The input and output | |
3435 | files are set up in smtp_in and smtp_out. | |
3436 | ||
3437 | The global recipients_list is set to point to a vector of recipient_item | |
3438 | blocks, whose number is given by recipients_count. This is extended by the | |
3439 | receive_add_recipient() function. The global variable sender_address is set to | |
3440 | the sender's address. The yield is +1 if a message has been successfully | |
3441 | started, 0 if a QUIT command was encountered or the connection was refused from | |
3442 | the particular host, or -1 if the connection was lost. | |
3443 | ||
3444 | Argument: none | |
3445 | ||
3446 | Returns: > 0 message successfully started (reached DATA) | |
3447 | = 0 QUIT read or end of file reached or call refused | |
3448 | < 0 lost connection | |
3449 | */ | |
3450 | ||
3451 | int | |
3452 | smtp_setup_msg(void) | |
3453 | { | |
3454 | int done = 0; | |
3455 | BOOL toomany = FALSE; | |
3456 | BOOL discarded = FALSE; | |
3457 | BOOL last_was_rej_mail = FALSE; | |
3458 | BOOL last_was_rcpt = FALSE; | |
3459 | void *reset_point = store_get(0); | |
3460 | ||
3461 | DEBUG(D_receive) debug_printf("smtp_setup_msg entered\n"); | |
3462 | ||
3463 | /* Reset for start of new message. We allow one RSET not to be counted as a | |
3464 | nonmail command, for those MTAs that insist on sending it between every | |
3465 | message. Ditto for EHLO/HELO and for STARTTLS, to allow for going in and out of | |
3466 | TLS between messages (an Exim client may do this if it has messages queued up | |
3467 | for the host). Note: we do NOT reset AUTH at this point. */ | |
3468 | ||
3469 | smtp_reset(reset_point); | |
3470 | message_ended = END_NOTSTARTED; | |
3471 | ||
7e3ce68e JH |
3472 | chunking_state = chunking_offered ? CHUNKING_OFFERED : CHUNKING_NOT_OFFERED; |
3473 | ||
059ec3d9 PH |
3474 | cmd_list[CMD_LIST_RSET].is_mail_cmd = TRUE; |
3475 | cmd_list[CMD_LIST_HELO].is_mail_cmd = TRUE; | |
3476 | cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE; | |
3477 | #ifdef SUPPORT_TLS | |
3478 | cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = TRUE; | |
b3ef41c9 | 3479 | cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE; |
059ec3d9 PH |
3480 | #endif |
3481 | ||
3482 | /* Set the local signal handler for SIGTERM - it tries to end off tidily */ | |
3483 | ||
3484 | os_non_restarting_signal(SIGTERM, command_sigterm_handler); | |
3485 | ||
3486 | /* Batched SMTP is handled in a different function. */ | |
3487 | ||
3488 | if (smtp_batched_input) return smtp_setup_batch_msg(); | |
3489 | ||
3490 | /* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE | |
3491 | value. The values are 2 larger than the required yield of the function. */ | |
3492 | ||
3493 | while (done <= 0) | |
3494 | { | |
55414b25 | 3495 | const uschar **argv; |
059ec3d9 PH |
3496 | uschar *etrn_command; |
3497 | uschar *etrn_serialize_key; | |
3498 | uschar *errmess; | |
4e88a19f PH |
3499 | uschar *log_msg, *smtp_code; |
3500 | uschar *user_msg = NULL; | |
059ec3d9 PH |
3501 | uschar *recipient = NULL; |
3502 | uschar *hello = NULL; | |
059ec3d9 PH |
3503 | uschar *s, *ss; |
3504 | BOOL was_rej_mail = FALSE; | |
3505 | BOOL was_rcpt = FALSE; | |
3506 | void (*oldsignal)(int); | |
3507 | pid_t pid; | |
3508 | int start, end, sender_domain, recipient_domain; | |
3509 | int ptr, size, rc; | |
aa7751be | 3510 | int c; |
059ec3d9 | 3511 | auth_instance *au; |
6c1c3d1d WB |
3512 | uschar *orcpt = NULL; |
3513 | int flags; | |
059ec3d9 | 3514 | |
b3ef41c9 JH |
3515 | #if defined(SUPPORT_TLS) && defined(AUTH_TLS) |
3516 | /* Check once per STARTTLS or SSL-on-connect for a TLS AUTH */ | |
3517 | if ( tls_in.active >= 0 | |
3518 | && tls_in.peercert | |
3519 | && tls_in.certificate_verified | |
3520 | && cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd | |
3521 | ) | |
3522 | { | |
3523 | cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = FALSE; | |
4f6ae5c3 JH |
3524 | if ( acl_smtp_auth |
3525 | && (rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth, | |
3526 | &user_msg, &log_msg)) != OK | |
3527 | ) | |
b3ef41c9 | 3528 | { |
4f6ae5c3 JH |
3529 | done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg); |
3530 | continue; | |
b3ef41c9 JH |
3531 | } |
3532 | ||
3533 | for (au = auths; au; au = au->next) | |
3534 | if (strcmpic(US"tls", au->driver_name) == 0) | |
3535 | { | |
3536 | smtp_cmd_data = NULL; | |
3537 | ||
805bb5c3 | 3538 | if (smtp_in_auth(au, &s, &ss) == OK) |
cb570b5e | 3539 | { DEBUG(D_auth) debug_printf("tls auth succeeded\n"); } |
805bb5c3 | 3540 | else |
cb570b5e | 3541 | { DEBUG(D_auth) debug_printf("tls auth not succeeded\n"); } |
b3ef41c9 JH |
3542 | break; |
3543 | } | |
3544 | } | |
3545 | #endif | |
3546 | ||
059ec3d9 PH |
3547 | switch(smtp_read_command(TRUE)) |
3548 | { | |
3549 | /* The AUTH command is not permitted to occur inside a transaction, and may | |
c46782ef PH |
3550 | occur successfully only once per connection. Actually, that isn't quite |
3551 | true. When TLS is started, all previous information about a connection must | |
3552 | be discarded, so a new AUTH is permitted at that time. | |
3553 | ||
3554 | AUTH may only be used when it has been advertised. However, it seems that | |
3555 | there are clients that send AUTH when it hasn't been advertised, some of | |
3556 | them even doing this after HELO. And there are MTAs that accept this. Sigh. | |
3557 | So there's a get-out that allows this to happen. | |
059ec3d9 PH |
3558 | |
3559 | AUTH is initially labelled as a "nonmail command" so that one occurrence | |
3560 | doesn't get counted. We change the label here so that multiple failing | |
3561 | AUTHS will eventually hit the nonmail threshold. */ | |
3562 | ||
3563 | case AUTH_CMD: | |
b4ed4da0 | 3564 | HAD(SCH_AUTH); |
059ec3d9 PH |
3565 | authentication_failed = TRUE; |
3566 | cmd_list[CMD_LIST_AUTH].is_mail_cmd = FALSE; | |
3567 | ||
c46782ef | 3568 | if (!auth_advertised && !allow_auth_unadvertised) |
059ec3d9 PH |
3569 | { |
3570 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3571 | US"AUTH command used when not advertised"); | |
3572 | break; | |
3573 | } | |
b3ef41c9 | 3574 | if (sender_host_authenticated) |
059ec3d9 PH |
3575 | { |
3576 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3577 | US"already authenticated"); | |
3578 | break; | |
3579 | } | |
b3ef41c9 | 3580 | if (sender_address) |
059ec3d9 PH |
3581 | { |
3582 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3583 | US"not permitted in mail transaction"); | |
3584 | break; | |
3585 | } | |
3586 | ||
3587 | /* Check the ACL */ | |
3588 | ||
4f6ae5c3 JH |
3589 | if ( acl_smtp_auth |
3590 | && (rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth, | |
3591 | &user_msg, &log_msg)) != OK | |
3592 | ) | |
059ec3d9 | 3593 | { |
4f6ae5c3 JH |
3594 | done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg); |
3595 | break; | |
059ec3d9 PH |
3596 | } |
3597 | ||
3598 | /* Find the name of the requested authentication mechanism. */ | |
3599 | ||
ca86f471 PH |
3600 | s = smtp_cmd_data; |
3601 | while ((c = *smtp_cmd_data) != 0 && !isspace(c)) | |
059ec3d9 PH |
3602 | { |
3603 | if (!isalnum(c) && c != '-' && c != '_') | |
3604 | { | |
3605 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
3606 | US"invalid character in authentication mechanism name"); | |
3607 | goto COMMAND_LOOP; | |
3608 | } | |
ca86f471 | 3609 | smtp_cmd_data++; |
059ec3d9 PH |
3610 | } |
3611 | ||
3612 | /* If not at the end of the line, we must be at white space. Terminate the | |
3613 | name and move the pointer on to any data that may be present. */ | |
3614 | ||
ca86f471 | 3615 | if (*smtp_cmd_data != 0) |
059ec3d9 | 3616 | { |
ca86f471 PH |
3617 | *smtp_cmd_data++ = 0; |
3618 | while (isspace(*smtp_cmd_data)) smtp_cmd_data++; | |
059ec3d9 PH |
3619 | } |
3620 | ||
3621 | /* Search for an authentication mechanism which is configured for use | |
c46782ef PH |
3622 | as a server and which has been advertised (unless, sigh, allow_auth_ |
3623 | unadvertised is set). */ | |
059ec3d9 | 3624 | |
b3ef41c9 | 3625 | for (au = auths; au; au = au->next) |
059ec3d9 | 3626 | if (strcmpic(s, au->public_name) == 0 && au->server && |
b3ef41c9 JH |
3627 | (au->advertised || allow_auth_unadvertised)) |
3628 | break; | |
059ec3d9 | 3629 | |
b3ef41c9 | 3630 | if (au) |
059ec3d9 | 3631 | { |
b3ef41c9 | 3632 | c = smtp_in_auth(au, &s, &ss); |
059ec3d9 | 3633 | |
b3ef41c9 JH |
3634 | smtp_printf("%s\r\n", s); |
3635 | if (c != OK) | |
3636 | log_write(0, LOG_MAIN|LOG_REJECT, "%s authenticator failed for %s: %s", | |
3637 | au->name, host_and_ident(FALSE), ss); | |
059ec3d9 | 3638 | } |
b3ef41c9 JH |
3639 | else |
3640 | done = synprot_error(L_smtp_protocol_error, 504, NULL, | |
3641 | string_sprintf("%s authentication mechanism not supported", s)); | |
059ec3d9 PH |
3642 | |
3643 | break; /* AUTH_CMD */ | |
3644 | ||
3645 | /* The HELO/EHLO commands are permitted to appear in the middle of a | |
3646 | session as well as at the beginning. They have the effect of a reset in | |
3647 | addition to their other functions. Their absence at the start cannot be | |
3648 | taken to be an error. | |
3649 | ||
3650 | RFC 2821 says: | |
3651 | ||
3652 | If the EHLO command is not acceptable to the SMTP server, 501, 500, | |
3653 | or 502 failure replies MUST be returned as appropriate. The SMTP | |
3654 | server MUST stay in the same state after transmitting these replies | |
3655 | that it was in before the EHLO was received. | |
3656 | ||
3657 | Therefore, we do not do the reset until after checking the command for | |
3658 | acceptability. This change was made for Exim release 4.11. Previously | |
3659 | it did the reset first. */ | |
3660 | ||
3661 | case HELO_CMD: | |
b4ed4da0 | 3662 | HAD(SCH_HELO); |
059ec3d9 PH |
3663 | hello = US"HELO"; |
3664 | esmtp = FALSE; | |
3665 | goto HELO_EHLO; | |
3666 | ||
3667 | case EHLO_CMD: | |
b4ed4da0 | 3668 | HAD(SCH_EHLO); |
059ec3d9 PH |
3669 | hello = US"EHLO"; |
3670 | esmtp = TRUE; | |
3671 | ||
3672 | HELO_EHLO: /* Common code for HELO and EHLO */ | |
3673 | cmd_list[CMD_LIST_HELO].is_mail_cmd = FALSE; | |
3674 | cmd_list[CMD_LIST_EHLO].is_mail_cmd = FALSE; | |
3675 | ||
3676 | /* Reject the HELO if its argument was invalid or non-existent. A | |
3677 | successful check causes the argument to be saved in malloc store. */ | |
3678 | ||
ca86f471 | 3679 | if (!check_helo(smtp_cmd_data)) |
059ec3d9 PH |
3680 | { |
3681 | smtp_printf("501 Syntactically invalid %s argument(s)\r\n", hello); | |
3682 | ||
3683 | log_write(0, LOG_MAIN|LOG_REJECT, "rejected %s from %s: syntactically " | |
3684 | "invalid argument(s): %s", hello, host_and_ident(FALSE), | |
3ee512ff PH |
3685 | (*smtp_cmd_argument == 0)? US"(no argument given)" : |
3686 | string_printing(smtp_cmd_argument)); | |
059ec3d9 PH |
3687 | |
3688 | if (++synprot_error_count > smtp_max_synprot_errors) | |
3689 | { | |
3690 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
3691 | "syntax or protocol errors (last command was \"%s\")", | |
0ebc4d69 | 3692 | host_and_ident(FALSE), string_printing(smtp_cmd_buffer)); |
059ec3d9 PH |
3693 | done = 1; |
3694 | } | |
3695 | ||
3696 | break; | |
3697 | } | |
3698 | ||
3699 | /* If sender_host_unknown is true, we have got here via the -bs interface, | |
3700 | not called from inetd. Otherwise, we are running an IP connection and the | |
3701 | host address will be set. If the helo name is the primary name of this | |
3702 | host and we haven't done a reverse lookup, force one now. If helo_required | |
3703 | is set, ensure that the HELO name matches the actual host. If helo_verify | |
3704 | is set, do the same check, but softly. */ | |
3705 | ||
3706 | if (!sender_host_unknown) | |
3707 | { | |
3708 | BOOL old_helo_verified = helo_verified; | |
ca86f471 | 3709 | uschar *p = smtp_cmd_data; |
059ec3d9 PH |
3710 | |
3711 | while (*p != 0 && !isspace(*p)) { *p = tolower(*p); p++; } | |
3712 | *p = 0; | |
3713 | ||
3714 | /* Force a reverse lookup if HELO quoted something in helo_lookup_domains | |
3715 | because otherwise the log can be confusing. */ | |
3716 | ||
3717 | if (sender_host_name == NULL && | |
3718 | (deliver_domain = sender_helo_name, /* set $domain */ | |
55414b25 | 3719 | match_isinlist(sender_helo_name, CUSS &helo_lookup_domains, 0, |
059ec3d9 PH |
3720 | &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL)) == OK) |
3721 | (void)host_name_lookup(); | |
3722 | ||
3723 | /* Rebuild the fullhost info to include the HELO name (and the real name | |
3724 | if it was looked up.) */ | |
3725 | ||
3726 | host_build_sender_fullhost(); /* Rebuild */ | |
3727 | set_process_info("handling%s incoming connection from %s", | |
817d9f57 | 3728 | (tls_in.active >= 0)? " TLS" : "", host_and_ident(FALSE)); |
059ec3d9 PH |
3729 | |
3730 | /* Verify if configured. This doesn't give much security, but it does | |
d7b47fd0 PH |
3731 | make some people happy to be able to do it. If helo_required is set, |
3732 | (host matches helo_verify_hosts) failure forces rejection. If helo_verify | |
3733 | is set (host matches helo_try_verify_hosts), it does not. This is perhaps | |
3734 | now obsolescent, since the verification can now be requested selectively | |
3735 | at ACL time. */ | |
059ec3d9 | 3736 | |
1705dd20 | 3737 | helo_verified = helo_verify_failed = sender_helo_dnssec = FALSE; |
059ec3d9 PH |
3738 | if (helo_required || helo_verify) |
3739 | { | |
d7b47fd0 | 3740 | BOOL tempfail = !smtp_verify_helo(); |
059ec3d9 PH |
3741 | if (!helo_verified) |
3742 | { | |
3743 | if (helo_required) | |
3744 | { | |
3745 | smtp_printf("%d %s argument does not match calling host\r\n", | |
3746 | tempfail? 451 : 550, hello); | |
3747 | log_write(0, LOG_MAIN|LOG_REJECT, "%srejected \"%s %s\" from %s", | |
3748 | tempfail? "temporarily " : "", | |
3749 | hello, sender_helo_name, host_and_ident(FALSE)); | |
3750 | helo_verified = old_helo_verified; | |
3751 | break; /* End of HELO/EHLO processing */ | |
3752 | } | |
3753 | HDEBUG(D_all) debug_printf("%s verification failed but host is in " | |
3754 | "helo_try_verify_hosts\n", hello); | |
3755 | } | |
3756 | } | |
3757 | } | |
3758 | ||
8523533c TK |
3759 | #ifdef EXPERIMENTAL_SPF |
3760 | /* set up SPF context */ | |
3761 | spf_init(sender_helo_name, sender_host_address); | |
3762 | #endif | |
3763 | ||
a14e5636 PH |
3764 | /* Apply an ACL check if one is defined; afterwards, recheck |
3765 | synchronization in case the client started sending in a delay. */ | |
059ec3d9 | 3766 | |
4f6ae5c3 JH |
3767 | if (acl_smtp_helo) |
3768 | if ((rc = acl_check(ACL_WHERE_HELO, NULL, acl_smtp_helo, | |
3769 | &user_msg, &log_msg)) != OK) | |
059ec3d9 PH |
3770 | { |
3771 | done = smtp_handle_acl_fail(ACL_WHERE_HELO, rc, user_msg, log_msg); | |
3772 | sender_helo_name = NULL; | |
3773 | host_build_sender_fullhost(); /* Rebuild */ | |
3774 | break; | |
3775 | } | |
a14e5636 | 3776 | else if (!check_sync()) goto SYNC_FAILURE; |
059ec3d9 | 3777 | |
4e88a19f PH |
3778 | /* Generate an OK reply. The default string includes the ident if present, |
3779 | and also the IP address if present. Reflecting back the ident is intended | |
3780 | as a deterrent to mail forgers. For maximum efficiency, and also because | |
3781 | some broken systems expect each response to be in a single packet, arrange | |
3782 | that the entire reply is sent in one write(). */ | |
059ec3d9 PH |
3783 | |
3784 | auth_advertised = FALSE; | |
3785 | pipelining_advertised = FALSE; | |
d1a13eea | 3786 | #ifdef SUPPORT_TLS |
059ec3d9 | 3787 | tls_advertised = FALSE; |
d1a13eea | 3788 | #endif |
6c1c3d1d | 3789 | dsn_advertised = FALSE; |
8c5d388a | 3790 | #ifdef SUPPORT_I18N |
d1a13eea JH |
3791 | smtputf8_advertised = FALSE; |
3792 | #endif | |
059ec3d9 | 3793 | |
d6a96edc | 3794 | smtp_code = US"250 "; /* Default response code plus space*/ |
4e88a19f PH |
3795 | if (user_msg == NULL) |
3796 | { | |
3797 | s = string_sprintf("%.3s %s Hello %s%s%s", | |
3798 | smtp_code, | |
3799 | smtp_active_hostname, | |
3800 | (sender_ident == NULL)? US"" : sender_ident, | |
3801 | (sender_ident == NULL)? US"" : US" at ", | |
3802 | (sender_host_name == NULL)? sender_helo_name : sender_host_name); | |
3803 | ||
3804 | ptr = Ustrlen(s); | |
3805 | size = ptr + 1; | |
059ec3d9 | 3806 | |
4e88a19f PH |
3807 | if (sender_host_address != NULL) |
3808 | { | |
c2f669a4 JH |
3809 | s = string_catn(s, &size, &ptr, US" [", 2); |
3810 | s = string_cat (s, &size, &ptr, sender_host_address); | |
3811 | s = string_catn(s, &size, &ptr, US"]", 1); | |
4e88a19f PH |
3812 | } |
3813 | } | |
3814 | ||
d6a96edc PH |
3815 | /* A user-supplied EHLO greeting may not contain more than one line. Note |
3816 | that the code returned by smtp_message_code() includes the terminating | |
3817 | whitespace character. */ | |
059ec3d9 | 3818 | |
4e88a19f | 3819 | else |
059ec3d9 | 3820 | { |
4e88a19f | 3821 | char *ss; |
d6a96edc | 3822 | int codelen = 4; |
4f6ae5c3 | 3823 | smtp_message_code(&smtp_code, &codelen, &user_msg, NULL, TRUE); |
d6a96edc | 3824 | s = string_sprintf("%.*s%s", codelen, smtp_code, user_msg); |
4e88a19f PH |
3825 | if ((ss = strpbrk(CS s, "\r\n")) != NULL) |
3826 | { | |
3827 | log_write(0, LOG_MAIN|LOG_PANIC, "EHLO/HELO response must not contain " | |
3828 | "newlines: message truncated: %s", string_printing(s)); | |
3829 | *ss = 0; | |
3830 | } | |
3831 | ptr = Ustrlen(s); | |
3832 | size = ptr + 1; | |
059ec3d9 PH |
3833 | } |
3834 | ||
c2f669a4 | 3835 | s = string_catn(s, &size, &ptr, US"\r\n", 2); |
059ec3d9 PH |
3836 | |
3837 | /* If we received EHLO, we must create a multiline response which includes | |
3838 | the functions supported. */ | |
3839 | ||
3840 | if (esmtp) | |
3841 | { | |
3842 | s[3] = '-'; | |
3843 | ||
3844 | /* I'm not entirely happy with this, as an MTA is supposed to check | |
3845 | that it has enough room to accept a message of maximum size before | |
3846 | it sends this. However, there seems little point in not sending it. | |
3847 | The actual size check happens later at MAIL FROM time. By postponing it | |
3848 | till then, VRFY and EXPN can be used after EHLO when space is short. */ | |
3849 | ||
3850 | if (thismessage_size_limit > 0) | |
3851 | { | |
4e88a19f PH |
3852 | sprintf(CS big_buffer, "%.3s-SIZE %d\r\n", smtp_code, |
3853 | thismessage_size_limit); | |
c2f669a4 | 3854 | s = string_cat(s, &size, &ptr, big_buffer); |
059ec3d9 PH |
3855 | } |
3856 | else | |
3857 | { | |
c2f669a4 JH |
3858 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
3859 | s = string_catn(s, &size, &ptr, US"-SIZE\r\n", 7); | |
059ec3d9 PH |
3860 | } |
3861 | ||
3862 | /* Exim does not do protocol conversion or data conversion. It is 8-bit | |
3863 | clean; if it has an 8-bit character in its hand, it just sends it. It | |
3864 | cannot therefore specify 8BITMIME and remain consistent with the RFCs. | |
3865 | However, some users want this option simply in order to stop MUAs | |
3866 | mangling messages that contain top-bit-set characters. It is therefore | |
3867 | provided as an option. */ | |
3868 | ||
3869 | if (accept_8bitmime) | |
4e88a19f | 3870 | { |
c2f669a4 JH |
3871 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
3872 | s = string_catn(s, &size, &ptr, US"-8BITMIME\r\n", 11); | |
4e88a19f | 3873 | } |
059ec3d9 | 3874 | |
6c1c3d1d | 3875 | /* Advertise DSN support if configured to do so. */ |
94431adb | 3876 | if (verify_check_host(&dsn_advertise_hosts) != FAIL) |
6c1c3d1d | 3877 | { |
c2f669a4 JH |
3878 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
3879 | s = string_catn(s, &size, &ptr, US"-DSN\r\n", 6); | |
6c1c3d1d WB |
3880 | dsn_advertised = TRUE; |
3881 | } | |
6c1c3d1d | 3882 | |
059ec3d9 PH |
3883 | /* Advertise ETRN if there's an ACL checking whether a host is |
3884 | permitted to issue it; a check is made when any host actually tries. */ | |
3885 | ||
3886 | if (acl_smtp_etrn != NULL) | |
3887 | { | |
c2f669a4 JH |
3888 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
3889 | s = string_catn(s, &size, &ptr, US"-ETRN\r\n", 7); | |
059ec3d9 PH |
3890 | } |
3891 | ||
3892 | /* Advertise EXPN if there's an ACL checking whether a host is | |
3893 | permitted to issue it; a check is made when any host actually tries. */ | |
3894 | ||
3895 | if (acl_smtp_expn != NULL) | |
3896 | { | |
c2f669a4 JH |
3897 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
3898 | s = string_catn(s, &size, &ptr, US"-EXPN\r\n", 7); | |
059ec3d9 PH |
3899 | } |
3900 | ||
3901 | /* Exim is quite happy with pipelining, so let the other end know that | |
3902 | it is safe to use it, unless advertising is disabled. */ | |
3903 | ||
cf8b11a5 PH |
3904 | if (pipelining_enable && |
3905 | verify_check_host(&pipelining_advertise_hosts) == OK) | |
059ec3d9 | 3906 | { |
c2f669a4 JH |
3907 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
3908 | s = string_catn(s, &size, &ptr, US"-PIPELINING\r\n", 13); | |
059ec3d9 PH |
3909 | sync_cmd_limit = NON_SYNC_CMD_PIPELINING; |
3910 | pipelining_advertised = TRUE; | |
3911 | } | |
3912 | ||
fd98a5c6 | 3913 | |
059ec3d9 PH |
3914 | /* If any server authentication mechanisms are configured, advertise |
3915 | them if the current host is in auth_advertise_hosts. The problem with | |
3916 | advertising always is that some clients then require users to | |
3917 | authenticate (and aren't configurable otherwise) even though it may not | |
3918 | be necessary (e.g. if the host is in host_accept_relay). | |
3919 | ||
3920 | RFC 2222 states that SASL mechanism names contain only upper case | |
3921 | letters, so output the names in upper case, though we actually recognize | |
3922 | them in either case in the AUTH command. */ | |
3923 | ||
b3ef41c9 JH |
3924 | if ( auths |
3925 | #if defined(SUPPORT_TLS) && defined(AUTH_TLS) | |
3926 | && !sender_host_authenticated | |
3927 | #endif | |
3928 | && verify_check_host(&auth_advertise_hosts) == OK | |
3929 | ) | |
3930 | { | |
3931 | auth_instance *au; | |
3932 | BOOL first = TRUE; | |
3933 | for (au = auths; au; au = au->next) | |
3934 | if (au->server && (au->advertise_condition == NULL || | |
3935 | expand_check_condition(au->advertise_condition, au->name, | |
3936 | US"authenticator"))) | |
3937 | { | |
3938 | int saveptr; | |
3939 | if (first) | |
3940 | { | |
c2f669a4 JH |
3941 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
3942 | s = string_catn(s, &size, &ptr, US"-AUTH", 5); | |
b3ef41c9 JH |
3943 | first = FALSE; |
3944 | auth_advertised = TRUE; | |
3945 | } | |
3946 | saveptr = ptr; | |
c2f669a4 JH |
3947 | s = string_catn(s, &size, &ptr, US" ", 1); |
3948 | s = string_cat (s, &size, &ptr, au->public_name); | |
b3ef41c9 JH |
3949 | while (++saveptr < ptr) s[saveptr] = toupper(s[saveptr]); |
3950 | au->advertised = TRUE; | |
3951 | } | |
3952 | else | |
3953 | au->advertised = FALSE; | |
3954 | ||
c2f669a4 | 3955 | if (!first) s = string_catn(s, &size, &ptr, US"\r\n", 2); |
b3ef41c9 | 3956 | } |
059ec3d9 | 3957 | |
18481de3 | 3958 | /* RFC 3030 CHUNKING */ |
059ec3d9 | 3959 | |
aa368db3 JH |
3960 | if (verify_check_host(&chunking_advertise_hosts) != FAIL) |
3961 | { | |
3962 | s = string_catn(s, &size, &ptr, smtp_code, 3); | |
3963 | s = string_catn(s, &size, &ptr, US"-CHUNKING\r\n", 11); | |
7e3ce68e | 3964 | chunking_offered = TRUE; |
18481de3 | 3965 | chunking_state = CHUNKING_OFFERED; |
aa368db3 JH |
3966 | } |
3967 | ||
18481de3 JH |
3968 | /* Advertise TLS (Transport Level Security) aka SSL (Secure Socket Layer) |
3969 | if it has been included in the binary, and the host matches | |
3970 | tls_advertise_hosts. We must *not* advertise if we are already in a | |
3971 | secure connection. */ | |
3972 | ||
d1a13eea | 3973 | #ifdef SUPPORT_TLS |
817d9f57 | 3974 | if (tls_in.active < 0 && |
059ec3d9 PH |
3975 | verify_check_host(&tls_advertise_hosts) != FAIL) |
3976 | { | |
c2f669a4 JH |
3977 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
3978 | s = string_catn(s, &size, &ptr, US"-STARTTLS\r\n", 11); | |
059ec3d9 PH |
3979 | tls_advertised = TRUE; |
3980 | } | |
d1a13eea | 3981 | #endif |
059ec3d9 | 3982 | |
d1a13eea | 3983 | #ifndef DISABLE_PRDR |
fd98a5c6 | 3984 | /* Per Recipient Data Response, draft by Eric A. Hall extending RFC */ |
8ccd00b1 JH |
3985 | if (prdr_enable) |
3986 | { | |
c2f669a4 JH |
3987 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
3988 | s = string_catn(s, &size, &ptr, US"-PRDR\r\n", 7); | |
8ccd00b1 | 3989 | } |
d1a13eea JH |
3990 | #endif |
3991 | ||
8c5d388a | 3992 | #ifdef SUPPORT_I18N |
d1a13eea JH |
3993 | if ( accept_8bitmime |
3994 | && verify_check_host(&smtputf8_advertise_hosts) != FAIL) | |
3995 | { | |
c2f669a4 JH |
3996 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
3997 | s = string_catn(s, &size, &ptr, US"-SMTPUTF8\r\n", 11); | |
d1a13eea JH |
3998 | smtputf8_advertised = TRUE; |
3999 | } | |
4000 | #endif | |
fd98a5c6 | 4001 | |
059ec3d9 PH |
4002 | /* Finish off the multiline reply with one that is always available. */ |
4003 | ||
c2f669a4 JH |
4004 | s = string_catn(s, &size, &ptr, smtp_code, 3); |
4005 | s = string_catn(s, &size, &ptr, US" HELP\r\n", 7); | |
059ec3d9 PH |
4006 | } |
4007 | ||
4008 | /* Terminate the string (for debug), write it, and note that HELO/EHLO | |
4009 | has been seen. */ | |
4010 | ||
4011 | s[ptr] = 0; | |
4012 | ||
d1a13eea | 4013 | #ifdef SUPPORT_TLS |
817d9f57 | 4014 | if (tls_in.active >= 0) (void)tls_write(TRUE, s, ptr); else |
d1a13eea | 4015 | #endif |
059ec3d9 | 4016 | |
1ac6b2e7 JH |
4017 | { |
4018 | int i = fwrite(s, 1, ptr, smtp_out); i = i; /* compiler quietening */ | |
4019 | } | |
898d150f PH |
4020 | DEBUG(D_receive) |
4021 | { | |
4022 | uschar *cr; | |
4023 | while ((cr = Ustrchr(s, '\r')) != NULL) /* lose CRs */ | |
4024 | memmove(cr, cr + 1, (ptr--) - (cr - s)); | |
4025 | debug_printf("SMTP>> %s", s); | |
4026 | } | |
059ec3d9 | 4027 | helo_seen = TRUE; |
4e88a19f PH |
4028 | |
4029 | /* Reset the protocol and the state, abandoning any previous message. */ | |
e524074d JH |
4030 | received_protocol = |
4031 | (sender_host_address ? protocols : protocols_local) | |
4032 | [ (esmtp | |
4033 | ? pextend + (sender_host_authenticated ? pauthed : 0) | |
4034 | : pnormal) | |
4035 | + (tls_in.active >= 0 ? pcrpted : 0) | |
4036 | ]; | |
4e88a19f PH |
4037 | smtp_reset(reset_point); |
4038 | toomany = FALSE; | |
059ec3d9 PH |
4039 | break; /* HELO/EHLO */ |
4040 | ||
4041 | ||
4042 | /* The MAIL command requires an address as an operand. All we do | |
4043 | here is to parse it for syntactic correctness. The form "<>" is | |
4044 | a special case which converts into an empty string. The start/end | |
4045 | pointers in the original are not used further for this address, as | |
4046 | it is the canonical extracted address which is all that is kept. */ | |
4047 | ||
4048 | case MAIL_CMD: | |
b4ed4da0 | 4049 | HAD(SCH_MAIL); |
059ec3d9 PH |
4050 | smtp_mailcmd_count++; /* Count for limit and ratelimit */ |
4051 | was_rej_mail = TRUE; /* Reset if accepted */ | |
d27f98fe | 4052 | env_mail_type_t * mail_args; /* Sanity check & validate args */ |
059ec3d9 PH |
4053 | |
4054 | if (helo_required && !helo_seen) | |
4055 | { | |
4056 | smtp_printf("503 HELO or EHLO required\r\n"); | |
4057 | log_write(0, LOG_MAIN|LOG_REJECT, "rejected MAIL from %s: no " | |
4058 | "HELO/EHLO given", host_and_ident(FALSE)); | |
4059 | break; | |
4060 | } | |
4061 | ||
4062 | if (sender_address != NULL) | |
4063 | { | |
4064 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
4065 | US"sender already given"); | |
4066 | break; | |
4067 | } | |
4068 | ||
ca86f471 | 4069 | if (smtp_cmd_data[0] == 0) |
059ec3d9 PH |
4070 | { |
4071 | done = synprot_error(L_smtp_protocol_error, 501, NULL, | |
4072 | US"MAIL must have an address operand"); | |
4073 | break; | |
4074 | } | |
4075 | ||
4076 | /* Check to see if the limit for messages per connection would be | |
4077 | exceeded by accepting further messages. */ | |
4078 | ||
4079 | if (smtp_accept_max_per_connection > 0 && | |
4080 | smtp_mailcmd_count > smtp_accept_max_per_connection) | |
4081 | { | |
4082 | smtp_printf("421 too many messages in this connection\r\n"); | |
4083 | log_write(0, LOG_MAIN|LOG_REJECT, "rejected MAIL command %s: too many " | |
4084 | "messages in one connection", host_and_ident(TRUE)); | |
4085 | break; | |
4086 | } | |
4087 | ||
4088 | /* Reset for start of message - even if this is going to fail, we | |
4089 | obviously need to throw away any previous data. */ | |
4090 | ||
4091 | smtp_reset(reset_point); | |
4092 | toomany = FALSE; | |
4093 | sender_data = recipient_data = NULL; | |
4094 | ||
4095 | /* Loop, checking for ESMTP additions to the MAIL FROM command. */ | |
4096 | ||
4097 | if (esmtp) for(;;) | |
4098 | { | |
4099 | uschar *name, *value, *end; | |
4100 | unsigned long int size; | |
d27f98fe | 4101 | BOOL arg_error = FALSE; |
059ec3d9 PH |
4102 | |
4103 | if (!extract_option(&name, &value)) break; | |
4104 | ||
d27f98fe | 4105 | for (mail_args = env_mail_type_list; |
2ef7ed08 | 4106 | mail_args->value != ENV_MAIL_OPT_NULL; |
d27f98fe TL |
4107 | mail_args++ |
4108 | ) | |
d27f98fe TL |
4109 | if (strcmpic(name, mail_args->name) == 0) |
4110 | break; | |
d27f98fe TL |
4111 | if (mail_args->need_value && strcmpic(value, US"") == 0) |
4112 | break; | |
059ec3d9 | 4113 | |
d27f98fe | 4114 | switch(mail_args->value) |
059ec3d9 | 4115 | { |
d27f98fe TL |
4116 | /* Handle SIZE= by reading the value. We don't do the check till later, |
4117 | in order to be able to log the sender address on failure. */ | |
4118 | case ENV_MAIL_OPT_SIZE: | |
d27f98fe | 4119 | if (((size = Ustrtoul(value, &end, 10)), *end == 0)) |
059ec3d9 | 4120 | { |
d27f98fe TL |
4121 | if ((size == ULONG_MAX && errno == ERANGE) || size > INT_MAX) |
4122 | size = INT_MAX; | |
4123 | message_size = (int)size; | |
059ec3d9 PH |
4124 | } |
4125 | else | |
d27f98fe TL |
4126 | arg_error = TRUE; |
4127 | break; | |
059ec3d9 | 4128 | |
d27f98fe TL |
4129 | /* If this session was initiated with EHLO and accept_8bitmime is set, |
4130 | Exim will have indicated that it supports the BODY=8BITMIME option. In | |
4131 | fact, it does not support this according to the RFCs, in that it does not | |
4132 | take any special action for forwarding messages containing 8-bit | |
4133 | characters. That is why accept_8bitmime is not the default setting, but | |
4134 | some sites want the action that is provided. We recognize both "8BITMIME" | |
4135 | and "7BIT" as body types, but take no action. */ | |
4136 | case ENV_MAIL_OPT_BODY: | |
3c0a92dc | 4137 | if (accept_8bitmime) { |
9d4319df | 4138 | if (strcmpic(value, US"8BITMIME") == 0) |
3c0a92dc | 4139 | body_8bitmime = 8; |
9d4319df | 4140 | else if (strcmpic(value, US"7BIT") == 0) |
3c0a92dc | 4141 | body_8bitmime = 7; |
9d4319df JH |
4142 | else |
4143 | { | |
3c0a92dc JH |
4144 | body_8bitmime = 0; |
4145 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4146 | US"invalid data for BODY"); | |
4147 | goto COMMAND_LOOP; | |
9d4319df | 4148 | } |
3c0a92dc JH |
4149 | DEBUG(D_receive) debug_printf("8BITMIME: %d\n", body_8bitmime); |
4150 | break; | |
4151 | } | |
d27f98fe TL |
4152 | arg_error = TRUE; |
4153 | break; | |
059ec3d9 | 4154 | |
6c1c3d1d WB |
4155 | /* Handle the two DSN options, but only if configured to do so (which |
4156 | will have caused "DSN" to be given in the EHLO response). The code itself | |
4157 | is included only if configured in at build time. */ | |
4158 | ||
4159 | case ENV_MAIL_OPT_RET: | |
9d4319df JH |
4160 | if (dsn_advertised) |
4161 | { | |
6c1c3d1d | 4162 | /* Check if RET has already been set */ |
9d4319df JH |
4163 | if (dsn_ret > 0) |
4164 | { | |
6c1c3d1d WB |
4165 | synprot_error(L_smtp_syntax_error, 501, NULL, |
4166 | US"RET can be specified once only"); | |
4167 | goto COMMAND_LOOP; | |
9d4319df JH |
4168 | } |
4169 | dsn_ret = strcmpic(value, US"HDRS") == 0 | |
4170 | ? dsn_ret_hdrs | |
4171 | : strcmpic(value, US"FULL") == 0 | |
4172 | ? dsn_ret_full | |
4173 | : 0; | |
6c1c3d1d WB |
4174 | DEBUG(D_receive) debug_printf("DSN_RET: %d\n", dsn_ret); |
4175 | /* Check for invalid invalid value, and exit with error */ | |
9d4319df JH |
4176 | if (dsn_ret == 0) |
4177 | { | |
6c1c3d1d WB |
4178 | synprot_error(L_smtp_syntax_error, 501, NULL, |
4179 | US"Value for RET is invalid"); | |
4180 | goto COMMAND_LOOP; | |
9d4319df JH |
4181 | } |
4182 | } | |
6c1c3d1d WB |
4183 | break; |
4184 | case ENV_MAIL_OPT_ENVID: | |
9d4319df JH |
4185 | if (dsn_advertised) |
4186 | { | |
6c1c3d1d | 4187 | /* Check if the dsn envid has been already set */ |
9d4319df JH |
4188 | if (dsn_envid != NULL) |
4189 | { | |
6c1c3d1d WB |
4190 | synprot_error(L_smtp_syntax_error, 501, NULL, |
4191 | US"ENVID can be specified once only"); | |
4192 | goto COMMAND_LOOP; | |
9d4319df | 4193 | } |
6c1c3d1d WB |
4194 | dsn_envid = string_copy(value); |
4195 | DEBUG(D_receive) debug_printf("DSN_ENVID: %s\n", dsn_envid); | |
9d4319df | 4196 | } |
6c1c3d1d | 4197 | break; |
6c1c3d1d | 4198 | |
d27f98fe TL |
4199 | /* Handle the AUTH extension. If the value given is not "<>" and either |
4200 | the ACL says "yes" or there is no ACL but the sending host is | |
4201 | authenticated, we set it up as the authenticated sender. However, if the | |
4202 | authenticator set a condition to be tested, we ignore AUTH on MAIL unless | |
4203 | the condition is met. The value of AUTH is an xtext, which means that +, | |
4204 | = and cntrl chars are coded in hex; however "<>" is unaffected by this | |
4205 | coding. */ | |
4206 | case ENV_MAIL_OPT_AUTH: | |
4207 | if (Ustrcmp(value, "<>") != 0) | |
4208 | { | |
4209 | int rc; | |
4210 | uschar *ignore_msg; | |
059ec3d9 | 4211 | |
d27f98fe TL |
4212 | if (auth_xtextdecode(value, &authenticated_sender) < 0) |
4213 | { | |
4214 | /* Put back terminator overrides for error message */ | |
d27f98fe | 4215 | value[-1] = '='; |
fd98a5c6 | 4216 | name[-1] = ' '; |
d27f98fe TL |
4217 | done = synprot_error(L_smtp_syntax_error, 501, NULL, |
4218 | US"invalid data for AUTH"); | |
4219 | goto COMMAND_LOOP; | |
4220 | } | |
4221 | if (acl_smtp_mailauth == NULL) | |
4222 | { | |
4223 | ignore_msg = US"client not authenticated"; | |
4224 | rc = (sender_host_authenticated != NULL)? OK : FAIL; | |
4225 | } | |
4226 | else | |
4227 | { | |
4228 | ignore_msg = US"rejected by ACL"; | |
4229 | rc = acl_check(ACL_WHERE_MAILAUTH, NULL, acl_smtp_mailauth, | |
4230 | &user_msg, &log_msg); | |
4231 | } | |
94431adb | 4232 | |
d27f98fe TL |
4233 | switch (rc) |
4234 | { | |
4235 | case OK: | |
9d4319df JH |
4236 | if (authenticated_by == NULL || |
4237 | authenticated_by->mail_auth_condition == NULL || | |
4238 | expand_check_condition(authenticated_by->mail_auth_condition, | |
4239 | authenticated_by->name, US"authenticator")) | |
4240 | break; /* Accept the AUTH */ | |
94431adb | 4241 | |
9d4319df JH |
4242 | ignore_msg = US"server_mail_auth_condition failed"; |
4243 | if (authenticated_id != NULL) | |
4244 | ignore_msg = string_sprintf("%s: authenticated ID=\"%s\"", | |
4245 | ignore_msg, authenticated_id); | |
94431adb | 4246 | |
d27f98fe | 4247 | /* Fall through */ |
94431adb | 4248 | |
d27f98fe | 4249 | case FAIL: |
9d4319df JH |
4250 | authenticated_sender = NULL; |
4251 | log_write(0, LOG_MAIN, "ignoring AUTH=%s from %s (%s)", | |
4252 | value, host_and_ident(TRUE), ignore_msg); | |
4253 | break; | |
94431adb | 4254 | |
d27f98fe TL |
4255 | /* Should only get DEFER or ERROR here. Put back terminator |
4256 | overrides for error message */ | |
94431adb | 4257 | |
d27f98fe | 4258 | default: |
9d4319df JH |
4259 | value[-1] = '='; |
4260 | name[-1] = ' '; | |
4261 | (void)smtp_handle_acl_fail(ACL_WHERE_MAILAUTH, rc, user_msg, | |
4262 | log_msg); | |
4263 | goto COMMAND_LOOP; | |
d27f98fe | 4264 | } |
059ec3d9 | 4265 | } |
d27f98fe | 4266 | break; |
fd98a5c6 | 4267 | |
8ccd00b1 | 4268 | #ifndef DISABLE_PRDR |
fd98a5c6 | 4269 | case ENV_MAIL_OPT_PRDR: |
8ccd00b1 | 4270 | if (prdr_enable) |
fd98a5c6 JH |
4271 | prdr_requested = TRUE; |
4272 | break; | |
4273 | #endif | |
4274 | ||
8c5d388a | 4275 | #ifdef SUPPORT_I18N |
d1a13eea JH |
4276 | case ENV_MAIL_OPT_UTF8: |
4277 | if (smtputf8_advertised) | |
e524074d JH |
4278 | { |
4279 | DEBUG(D_receive) debug_printf("smtputf8 requested\n"); | |
9d4319df | 4280 | message_smtputf8 = allow_utf8_domains = TRUE; |
5a886ce7 | 4281 | received_protocol = string_sprintf("utf8%s", received_protocol); |
e524074d | 4282 | } |
d1a13eea JH |
4283 | break; |
4284 | #endif | |
2ef7ed08 | 4285 | /* No valid option. Stick back the terminator characters and break |
fd98a5c6 | 4286 | the loop. Do the name-terminator second as extract_option sets |
2ef7ed08 HSHR |
4287 | value==name when it found no equal-sign. |
4288 | An error for a malformed address will occur. */ | |
4289 | case ENV_MAIL_OPT_NULL: | |
d27f98fe | 4290 | value[-1] = '='; |
fd98a5c6 JH |
4291 | name[-1] = ' '; |
4292 | arg_error = TRUE; | |
d27f98fe | 4293 | break; |
2ef7ed08 HSHR |
4294 | |
4295 | default: assert(0); | |
059ec3d9 | 4296 | } |
d27f98fe TL |
4297 | /* Break out of for loop if switch() had bad argument or |
4298 | when start of the email address is reached */ | |
4299 | if (arg_error) break; | |
059ec3d9 PH |
4300 | } |
4301 | ||
4302 | /* If we have passed the threshold for rate limiting, apply the current | |
4303 | delay, and update it for next time, provided this is a limited host. */ | |
4304 | ||
4305 | if (smtp_mailcmd_count > smtp_rlm_threshold && | |
4306 | verify_check_host(&smtp_ratelimit_hosts) == OK) | |
4307 | { | |
4308 | DEBUG(D_receive) debug_printf("rate limit MAIL: delay %.3g sec\n", | |
4309 | smtp_delay_mail/1000.0); | |
4310 | millisleep((int)smtp_delay_mail); | |
4311 | smtp_delay_mail *= smtp_rlm_factor; | |
4312 | if (smtp_delay_mail > (double)smtp_rlm_limit) | |
4313 | smtp_delay_mail = (double)smtp_rlm_limit; | |
4314 | } | |
4315 | ||
4316 | /* Now extract the address, first applying any SMTP-time rewriting. The | |
4317 | TRUE flag allows "<>" as a sender address. */ | |
4318 | ||
9d4319df JH |
4319 | raw_sender = rewrite_existflags & rewrite_smtp |
4320 | ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"", | |
4321 | global_rewrite_rules) | |
4322 | : smtp_cmd_data; | |
059ec3d9 | 4323 | |
059ec3d9 PH |
4324 | raw_sender = |
4325 | parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain, | |
4326 | TRUE); | |
059ec3d9 | 4327 | |
2685d6e0 | 4328 | if (!raw_sender) |
059ec3d9 | 4329 | { |
ca86f471 | 4330 | done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess); |
059ec3d9 PH |
4331 | break; |
4332 | } | |
4333 | ||
4334 | sender_address = raw_sender; | |
4335 | ||
4336 | /* If there is a configured size limit for mail, check that this message | |
4337 | doesn't exceed it. The check is postponed to this point so that the sender | |
4338 | can be logged. */ | |
4339 | ||
4340 | if (thismessage_size_limit > 0 && message_size > thismessage_size_limit) | |
4341 | { | |
4342 | smtp_printf("552 Message size exceeds maximum permitted\r\n"); | |
4343 | log_write(L_size_reject, | |
4344 | LOG_MAIN|LOG_REJECT, "rejected MAIL FROM:<%s> %s: " | |
4345 | "message too big: size%s=%d max=%d", | |
4346 | sender_address, | |
4347 | host_and_ident(TRUE), | |
4348 | (message_size == INT_MAX)? ">" : "", | |
4349 | message_size, | |
4350 | thismessage_size_limit); | |
4351 | sender_address = NULL; | |
4352 | break; | |
4353 | } | |
4354 | ||
4355 | /* Check there is enough space on the disk unless configured not to. | |
4356 | When smtp_check_spool_space is set, the check is for thismessage_size_limit | |
4357 | plus the current message - i.e. we accept the message only if it won't | |
4358 | reduce the space below the threshold. Add 5000 to the size to allow for | |
4359 | overheads such as the Received: line and storing of recipients, etc. | |
4360 | By putting the check here, even when SIZE is not given, it allow VRFY | |
4361 | and EXPN etc. to be used when space is short. */ | |
4362 | ||
4363 | if (!receive_check_fs( | |
4364 | (smtp_check_spool_space && message_size >= 0)? | |
4365 | message_size + 5000 : 0)) | |
4366 | { | |
4367 | smtp_printf("452 Space shortage, please try later\r\n"); | |
4368 | sender_address = NULL; | |
4369 | break; | |
4370 | } | |
4371 | ||
4372 | /* If sender_address is unqualified, reject it, unless this is a locally | |
4373 | generated message, or the sending host or net is permitted to send | |
4374 | unqualified addresses - typically local machines behaving as MUAs - | |
4375 | in which case just qualify the address. The flag is set above at the start | |
4376 | of the SMTP connection. */ | |
4377 | ||
4378 | if (sender_domain == 0 && sender_address[0] != 0) | |
4379 | { | |
4380 | if (allow_unqualified_sender) | |
4381 | { | |
4382 | sender_domain = Ustrlen(sender_address) + 1; | |
4383 | sender_address = rewrite_address_qualify(sender_address, FALSE); | |
4384 | DEBUG(D_receive) debug_printf("unqualified address %s accepted\n", | |
4385 | raw_sender); | |
4386 | } | |
4387 | else | |
4388 | { | |
4389 | smtp_printf("501 %s: sender address must contain a domain\r\n", | |
ca86f471 | 4390 | smtp_cmd_data); |
059ec3d9 PH |
4391 | log_write(L_smtp_syntax_error, |
4392 | LOG_MAIN|LOG_REJECT, | |
4393 | "unqualified sender rejected: <%s> %s%s", | |
4394 | raw_sender, | |
4395 | host_and_ident(TRUE), | |
4396 | host_lookup_msg); | |
4397 | sender_address = NULL; | |
4398 | break; | |
4399 | } | |
4400 | } | |
4401 | ||
a14e5636 PH |
4402 | /* Apply an ACL check if one is defined, before responding. Afterwards, |
4403 | when pipelining is not advertised, do another sync check in case the ACL | |
4404 | delayed and the client started sending in the meantime. */ | |
059ec3d9 | 4405 | |
8ccd00b1 | 4406 | if (acl_smtp_mail) |
a14e5636 PH |
4407 | { |
4408 | rc = acl_check(ACL_WHERE_MAIL, NULL, acl_smtp_mail, &user_msg, &log_msg); | |
4409 | if (rc == OK && !pipelining_advertised && !check_sync()) | |
4410 | goto SYNC_FAILURE; | |
4411 | } | |
8ccd00b1 JH |
4412 | else |
4413 | rc = OK; | |
059ec3d9 PH |
4414 | |
4415 | if (rc == OK || rc == DISCARD) | |
4416 | { | |
8ccd00b1 | 4417 | if (!user_msg) |
fd98a5c6 | 4418 | smtp_printf("%s%s%s", US"250 OK", |
8ccd00b1 JH |
4419 | #ifndef DISABLE_PRDR |
4420 | prdr_requested ? US", PRDR Requested" : US"", | |
4421 | #else | |
fd98a5c6 | 4422 | US"", |
8ccd00b1 | 4423 | #endif |
fd98a5c6 | 4424 | US"\r\n"); |
94431adb | 4425 | else |
fd98a5c6 | 4426 | { |
8ccd00b1 JH |
4427 | #ifndef DISABLE_PRDR |
4428 | if (prdr_requested) | |
fd98a5c6 JH |
4429 | user_msg = string_sprintf("%s%s", user_msg, US", PRDR Requested"); |
4430 | #endif | |
8ccd00b1 | 4431 | smtp_user_msg(US"250", user_msg); |
fd98a5c6 | 4432 | } |
059ec3d9 PH |
4433 | smtp_delay_rcpt = smtp_rlr_base; |
4434 | recipients_discarded = (rc == DISCARD); | |
4435 | was_rej_mail = FALSE; | |
4436 | } | |
059ec3d9 PH |
4437 | else |
4438 | { | |
4439 | done = smtp_handle_acl_fail(ACL_WHERE_MAIL, rc, user_msg, log_msg); | |
4440 | sender_address = NULL; | |
4441 | } | |
4442 | break; | |
4443 | ||
4444 | ||
2679d413 PH |
4445 | /* The RCPT command requires an address as an operand. There may be any |
4446 | number of RCPT commands, specifying multiple recipients. We build them all | |
4447 | into a data structure. The start/end values given by parse_extract_address | |
4448 | are not used, as we keep only the extracted address. */ | |
059ec3d9 PH |
4449 | |
4450 | case RCPT_CMD: | |
b4ed4da0 | 4451 | HAD(SCH_RCPT); |
059ec3d9 | 4452 | rcpt_count++; |
2679d413 | 4453 | was_rcpt = rcpt_in_progress = TRUE; |
059ec3d9 PH |
4454 | |
4455 | /* There must be a sender address; if the sender was rejected and | |
4456 | pipelining was advertised, we assume the client was pipelining, and do not | |
4457 | count this as a protocol error. Reset was_rej_mail so that further RCPTs | |
4458 | get the same treatment. */ | |
4459 | ||
4460 | if (sender_address == NULL) | |
4461 | { | |
4462 | if (pipelining_advertised && last_was_rej_mail) | |
4463 | { | |
4464 | smtp_printf("503 sender not yet given\r\n"); | |
4465 | was_rej_mail = TRUE; | |
4466 | } | |
4467 | else | |
4468 | { | |
4469 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
4470 | US"sender not yet given"); | |
4471 | was_rcpt = FALSE; /* Not a valid RCPT */ | |
4472 | } | |
4473 | rcpt_fail_count++; | |
4474 | break; | |
4475 | } | |
4476 | ||
4477 | /* Check for an operand */ | |
4478 | ||
ca86f471 | 4479 | if (smtp_cmd_data[0] == 0) |
059ec3d9 PH |
4480 | { |
4481 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4482 | US"RCPT must have an address operand"); | |
4483 | rcpt_fail_count++; | |
4484 | break; | |
4485 | } | |
50dc7409 | 4486 | |
6c1c3d1d WB |
4487 | /* Set the DSN flags orcpt and dsn_flags from the session*/ |
4488 | orcpt = NULL; | |
4489 | flags = 0; | |
4490 | ||
4491 | if (esmtp) for(;;) | |
4492 | { | |
45500060 | 4493 | uschar *name, *value; |
6c1c3d1d WB |
4494 | |
4495 | if (!extract_option(&name, &value)) | |
6c1c3d1d | 4496 | break; |
6c1c3d1d WB |
4497 | |
4498 | if (dsn_advertised && strcmpic(name, US"ORCPT") == 0) | |
4499 | { | |
4500 | /* Check whether orcpt has been already set */ | |
45500060 JH |
4501 | if (orcpt) |
4502 | { | |
6c1c3d1d WB |
4503 | synprot_error(L_smtp_syntax_error, 501, NULL, |
4504 | US"ORCPT can be specified once only"); | |
4505 | goto COMMAND_LOOP; | |
4506 | } | |
4507 | orcpt = string_copy(value); | |
4508 | DEBUG(D_receive) debug_printf("DSN orcpt: %s\n", orcpt); | |
4509 | } | |
4510 | ||
4511 | else if (dsn_advertised && strcmpic(name, US"NOTIFY") == 0) | |
4512 | { | |
4513 | /* Check if the notify flags have been already set */ | |
45500060 JH |
4514 | if (flags > 0) |
4515 | { | |
6c1c3d1d WB |
4516 | synprot_error(L_smtp_syntax_error, 501, NULL, |
4517 | US"NOTIFY can be specified once only"); | |
4518 | goto COMMAND_LOOP; | |
4519 | } | |
45500060 JH |
4520 | if (strcmpic(value, US"NEVER") == 0) |
4521 | flags |= rf_notify_never; | |
4522 | else | |
6c1c3d1d WB |
4523 | { |
4524 | uschar *p = value; | |
4525 | while (*p != 0) | |
4526 | { | |
4527 | uschar *pp = p; | |
4528 | while (*pp != 0 && *pp != ',') pp++; | |
45500060 JH |
4529 | if (*pp == ',') *pp++ = 0; |
4530 | if (strcmpic(p, US"SUCCESS") == 0) | |
4531 | { | |
4532 | DEBUG(D_receive) debug_printf("DSN: Setting notify success\n"); | |
4533 | flags |= rf_notify_success; | |
6c1c3d1d | 4534 | } |
45500060 JH |
4535 | else if (strcmpic(p, US"FAILURE") == 0) |
4536 | { | |
4537 | DEBUG(D_receive) debug_printf("DSN: Setting notify failure\n"); | |
4538 | flags |= rf_notify_failure; | |
6c1c3d1d | 4539 | } |
45500060 JH |
4540 | else if (strcmpic(p, US"DELAY") == 0) |
4541 | { | |
4542 | DEBUG(D_receive) debug_printf("DSN: Setting notify delay\n"); | |
4543 | flags |= rf_notify_delay; | |
6c1c3d1d | 4544 | } |
45500060 JH |
4545 | else |
4546 | { | |
6c1c3d1d WB |
4547 | /* Catch any strange values */ |
4548 | synprot_error(L_smtp_syntax_error, 501, NULL, | |
4549 | US"Invalid value for NOTIFY parameter"); | |
4550 | goto COMMAND_LOOP; | |
4551 | } | |
4552 | p = pp; | |
4553 | } | |
4554 | DEBUG(D_receive) debug_printf("DSN Flags: %x\n", flags); | |
4555 | } | |
4556 | } | |
4557 | ||
4558 | /* Unknown option. Stick back the terminator characters and break | |
4559 | the loop. An error for a malformed address will occur. */ | |
4560 | ||
4561 | else | |
4562 | { | |
4563 | DEBUG(D_receive) debug_printf("Invalid RCPT option: %s : %s\n", name, value); | |
4564 | name[-1] = ' '; | |
4565 | value[-1] = '='; | |
4566 | break; | |
4567 | } | |
4568 | } | |
059ec3d9 PH |
4569 | |
4570 | /* Apply SMTP rewriting then extract the working address. Don't allow "<>" | |
4571 | as a recipient address */ | |
4572 | ||
05392bbc JH |
4573 | recipient = rewrite_existflags & rewrite_smtp |
4574 | ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"", | |
4575 | global_rewrite_rules) | |
4576 | : smtp_cmd_data; | |
059ec3d9 | 4577 | |
2685d6e0 JH |
4578 | if (!(recipient = parse_extract_address(recipient, &errmess, &start, &end, |
4579 | &recipient_domain, FALSE))) | |
059ec3d9 | 4580 | { |
ca86f471 | 4581 | done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess); |
059ec3d9 PH |
4582 | rcpt_fail_count++; |
4583 | break; | |
4584 | } | |
4585 | ||
4586 | /* If the recipient address is unqualified, reject it, unless this is a | |
4587 | locally generated message. However, unqualified addresses are permitted | |
4588 | from a configured list of hosts and nets - typically when behaving as | |
4589 | MUAs rather than MTAs. Sad that SMTP is used for both types of traffic, | |
4590 | really. The flag is set at the start of the SMTP connection. | |
4591 | ||
4592 | RFC 1123 talks about supporting "the reserved mailbox postmaster"; I always | |
4593 | assumed this meant "reserved local part", but the revision of RFC 821 and | |
4594 | friends now makes it absolutely clear that it means *mailbox*. Consequently | |
4595 | we must always qualify this address, regardless. */ | |
4596 | ||
4597 | if (recipient_domain == 0) | |
2685d6e0 JH |
4598 | if (!(recipient_domain = qualify_recipient(&recipient, smtp_cmd_data, |
4599 | US"recipient"))) | |
059ec3d9 PH |
4600 | { |
4601 | rcpt_fail_count++; | |
059ec3d9 PH |
4602 | break; |
4603 | } | |
059ec3d9 PH |
4604 | |
4605 | /* Check maximum allowed */ | |
4606 | ||
4607 | if (rcpt_count > recipients_max && recipients_max > 0) | |
4608 | { | |
4609 | if (recipients_max_reject) | |
4610 | { | |
4611 | rcpt_fail_count++; | |
4612 | smtp_printf("552 too many recipients\r\n"); | |
4613 | if (!toomany) | |
4614 | log_write(0, LOG_MAIN|LOG_REJECT, "too many recipients: message " | |
4615 | "rejected: sender=<%s> %s", sender_address, host_and_ident(TRUE)); | |
4616 | } | |
4617 | else | |
4618 | { | |
4619 | rcpt_defer_count++; | |
4620 | smtp_printf("452 too many recipients\r\n"); | |
4621 | if (!toomany) | |
4622 | log_write(0, LOG_MAIN|LOG_REJECT, "too many recipients: excess " | |
4623 | "temporarily rejected: sender=<%s> %s", sender_address, | |
4624 | host_and_ident(TRUE)); | |
4625 | } | |
4626 | ||
4627 | toomany = TRUE; | |
4628 | break; | |
4629 | } | |
4630 | ||
4631 | /* If we have passed the threshold for rate limiting, apply the current | |
4632 | delay, and update it for next time, provided this is a limited host. */ | |
4633 | ||
4634 | if (rcpt_count > smtp_rlr_threshold && | |
4635 | verify_check_host(&smtp_ratelimit_hosts) == OK) | |
4636 | { | |
4637 | DEBUG(D_receive) debug_printf("rate limit RCPT: delay %.3g sec\n", | |
4638 | smtp_delay_rcpt/1000.0); | |
4639 | millisleep((int)smtp_delay_rcpt); | |
4640 | smtp_delay_rcpt *= smtp_rlr_factor; | |
4641 | if (smtp_delay_rcpt > (double)smtp_rlr_limit) | |
4642 | smtp_delay_rcpt = (double)smtp_rlr_limit; | |
4643 | } | |
4644 | ||
4645 | /* If the MAIL ACL discarded all the recipients, we bypass ACL checking | |
a14e5636 PH |
4646 | for them. Otherwise, check the access control list for this recipient. As |
4647 | there may be a delay in this, re-check for a synchronization error | |
4648 | afterwards, unless pipelining was advertised. */ | |
059ec3d9 | 4649 | |
a14e5636 PH |
4650 | if (recipients_discarded) rc = DISCARD; else |
4651 | { | |
4652 | rc = acl_check(ACL_WHERE_RCPT, recipient, acl_smtp_rcpt, &user_msg, | |
4653 | &log_msg); | |
4654 | if (rc == OK && !pipelining_advertised && !check_sync()) | |
4655 | goto SYNC_FAILURE; | |
4656 | } | |
059ec3d9 PH |
4657 | |
4658 | /* The ACL was happy */ | |
4659 | ||
4660 | if (rc == OK) | |
4661 | { | |
4e88a19f PH |
4662 | if (user_msg == NULL) smtp_printf("250 Accepted\r\n"); |
4663 | else smtp_user_msg(US"250", user_msg); | |
059ec3d9 | 4664 | receive_add_recipient(recipient, -1); |
94431adb | 4665 | |
6c1c3d1d | 4666 | /* Set the dsn flags in the recipients_list */ |
7ade712c JH |
4667 | recipients_list[recipients_count-1].orcpt = orcpt; |
4668 | recipients_list[recipients_count-1].dsn_flags = flags; | |
6c1c3d1d | 4669 | |
7ade712c JH |
4670 | DEBUG(D_receive) debug_printf("DSN: orcpt: %s flags: %d\n", |
4671 | recipients_list[recipients_count-1].orcpt, | |
4672 | recipients_list[recipients_count-1].dsn_flags); | |
059ec3d9 PH |
4673 | } |
4674 | ||
4675 | /* The recipient was discarded */ | |
4676 | ||
4677 | else if (rc == DISCARD) | |
4678 | { | |
4e88a19f PH |
4679 | if (user_msg == NULL) smtp_printf("250 Accepted\r\n"); |
4680 | else smtp_user_msg(US"250", user_msg); | |
059ec3d9 PH |
4681 | rcpt_fail_count++; |
4682 | discarded = TRUE; | |
1f12df4d | 4683 | log_write(0, LOG_MAIN|LOG_REJECT, "%s F=<%s> RCPT %s: " |
059ec3d9 | 4684 | "discarded by %s ACL%s%s", host_and_ident(TRUE), |
1f12df4d | 4685 | sender_address_unrewritten? sender_address_unrewritten : sender_address, |
3ee512ff | 4686 | smtp_cmd_argument, recipients_discarded? "MAIL" : "RCPT", |
1f12df4d | 4687 | log_msg ? US": " : US"", log_msg ? log_msg : US""); |
059ec3d9 PH |
4688 | } |
4689 | ||
4690 | /* Either the ACL failed the address, or it was deferred. */ | |
4691 | ||
4692 | else | |
4693 | { | |
4694 | if (rc == FAIL) rcpt_fail_count++; else rcpt_defer_count++; | |
4695 | done = smtp_handle_acl_fail(ACL_WHERE_RCPT, rc, user_msg, log_msg); | |
4696 | } | |
4697 | break; | |
4698 | ||
4699 | ||
4700 | /* The DATA command is legal only if it follows successful MAIL FROM | |
4701 | and RCPT TO commands. However, if pipelining is advertised, a bad DATA is | |
4702 | not counted as a protocol error if it follows RCPT (which must have been | |
4703 | rejected if there are no recipients.) This function is complete when a | |
4704 | valid DATA command is encountered. | |
4705 | ||
4706 | Note concerning the code used: RFC 2821 says this: | |
4707 | ||
4708 | - If there was no MAIL, or no RCPT, command, or all such commands | |
4709 | were rejected, the server MAY return a "command out of sequence" | |
4710 | (503) or "no valid recipients" (554) reply in response to the | |
4711 | DATA command. | |
4712 | ||
4713 | The example in the pipelining RFC 2920 uses 554, but I use 503 here | |
2679d413 PH |
4714 | because it is the same whether pipelining is in use or not. |
4715 | ||
4716 | If all the RCPT commands that precede DATA provoked the same error message | |
4717 | (often indicating some kind of system error), it is helpful to include it | |
4718 | with the DATA rejection (an idea suggested by Tony Finch). */ | |
059ec3d9 | 4719 | |
18481de3 JH |
4720 | case BDAT_CMD: |
4721 | HAD(SCH_BDAT); | |
4722 | { | |
4723 | int n; | |
4724 | ||
4725 | if (chunking_state != CHUNKING_OFFERED) | |
4726 | { | |
4727 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
4728 | US"BDAT command used when CHUNKING not advertised"); | |
4729 | break; | |
4730 | } | |
4731 | ||
4732 | /* grab size, endmarker */ | |
4733 | ||
4734 | if (sscanf(CS smtp_cmd_data, "%u %n", &chunking_datasize, &n) < 1) | |
4735 | { | |
7e3ce68e | 4736 | done = synprot_error(L_smtp_protocol_error, 501, NULL, |
18481de3 JH |
4737 | US"missing size for BDAT command"); |
4738 | break; | |
4739 | } | |
4740 | chunking_state = strcmpic(smtp_cmd_data+n, US"LAST") == 0 | |
4741 | ? CHUNKING_LAST : CHUNKING_ACTIVE; | |
7e3ce68e JH |
4742 | chunking_data_left = chunking_datasize; |
4743 | ||
4744 | lwr_receive_getc = receive_getc; | |
4745 | lwr_receive_ungetc = receive_ungetc; | |
4746 | receive_getc = bdat_getc; | |
4747 | receive_ungetc = bdat_ungetc; | |
18481de3 JH |
4748 | |
4749 | DEBUG(D_any) | |
4750 | debug_printf("chunking state %d\n", (int)chunking_state); | |
4751 | goto DATA_BDAT; | |
4752 | } | |
4753 | ||
059ec3d9 | 4754 | case DATA_CMD: |
b4ed4da0 | 4755 | HAD(SCH_DATA); |
18481de3 JH |
4756 | |
4757 | DATA_BDAT: /* Common code for DATA and BDAT */ | |
059ec3d9 PH |
4758 | if (!discarded && recipients_count <= 0) |
4759 | { | |
2679d413 PH |
4760 | if (rcpt_smtp_response_same && rcpt_smtp_response != NULL) |
4761 | { | |
4762 | uschar *code = US"503"; | |
4763 | int len = Ustrlen(rcpt_smtp_response); | |
4764 | smtp_respond(code, 3, FALSE, US"All RCPT commands were rejected with " | |
4765 | "this error:"); | |
4766 | /* Responses from smtp_printf() will have \r\n on the end */ | |
4767 | if (len > 2 && rcpt_smtp_response[len-2] == '\r') | |
4768 | rcpt_smtp_response[len-2] = 0; | |
4769 | smtp_respond(code, 3, FALSE, rcpt_smtp_response); | |
4770 | } | |
059ec3d9 | 4771 | if (pipelining_advertised && last_was_rcpt) |
18481de3 JH |
4772 | smtp_printf("503 Valid RCPT command must precede %s\r\n", |
4773 | smtp_names[smtp_connection_had[smtp_ch_index-1]]); | |
059ec3d9 PH |
4774 | else |
4775 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
18481de3 JH |
4776 | smtp_connection_had[smtp_ch_index-1] == SCH_DATA |
4777 | ? US"valid RCPT command must precede DATA" | |
4778 | : US"valid RCPT command must precede BDAT"); | |
45bd315d JH |
4779 | |
4780 | if (chunking_state > CHUNKING_OFFERED) | |
4781 | bdat_flush_data(); | |
059ec3d9 PH |
4782 | break; |
4783 | } | |
4784 | ||
4785 | if (toomany && recipients_max_reject) | |
4786 | { | |
4787 | sender_address = NULL; /* This will allow a new MAIL without RSET */ | |
4788 | sender_address_unrewritten = NULL; | |
4789 | smtp_printf("554 Too many recipients\r\n"); | |
4790 | break; | |
4791 | } | |
8e669ac1 | 4792 | |
7e3ce68e JH |
4793 | if (chunking_state > CHUNKING_OFFERED) |
4794 | { /* No predata ACL or go-ahead output for BDAT */ | |
18481de3 | 4795 | rc = OK; |
18481de3 | 4796 | } |
18481de3 | 4797 | else |
8e669ac1 | 4798 | { |
7e3ce68e JH |
4799 | /* If there is an ACL, re-check the synchronization afterwards, since the |
4800 | ACL may have delayed. To handle cutthrough delivery enforce a dummy call | |
4801 | to get the DATA command sent. */ | |
059ec3d9 | 4802 | |
7e3ce68e JH |
4803 | if (acl_smtp_predata == NULL && cutthrough.fd < 0) |
4804 | rc = OK; | |
4805 | else | |
4806 | { | |
4807 | uschar * acl = acl_smtp_predata ? acl_smtp_predata : US"accept"; | |
4808 | enable_dollar_recipients = TRUE; | |
4809 | rc = acl_check(ACL_WHERE_PREDATA, NULL, acl, &user_msg, | |
4810 | &log_msg); | |
4811 | enable_dollar_recipients = FALSE; | |
4812 | if (rc == OK && !check_sync()) | |
4813 | goto SYNC_FAILURE; | |
4814 | ||
4815 | if (rc != OK) | |
4816 | { /* Either the ACL failed the address, or it was deferred. */ | |
4817 | done = smtp_handle_acl_fail(ACL_WHERE_PREDATA, rc, user_msg, log_msg); | |
4818 | break; | |
4819 | } | |
4820 | } | |
4821 | ||
4822 | if (user_msg) | |
4823 | smtp_user_msg(US"354", user_msg); | |
4824 | else | |
4825 | smtp_printf( | |
4826 | "354 Enter message, ending with \".\" on a line by itself\r\n"); | |
059ec3d9 PH |
4827 | } |
4828 | ||
7e3ce68e JH |
4829 | done = 3; |
4830 | message_ended = END_NOTENDED; /* Indicate in middle of data */ | |
059ec3d9 | 4831 | |
059ec3d9 PH |
4832 | break; |
4833 | ||
4834 | ||
4835 | case VRFY_CMD: | |
059ec3d9 | 4836 | { |
4f6ae5c3 | 4837 | uschar * address; |
059ec3d9 | 4838 | |
4f6ae5c3 | 4839 | HAD(SCH_VRFY); |
059ec3d9 | 4840 | |
05392bbc JH |
4841 | if (!(address = parse_extract_address(smtp_cmd_data, &errmess, |
4842 | &start, &end, &recipient_domain, FALSE))) | |
4843 | { | |
4f6ae5c3 | 4844 | smtp_printf("501 %s\r\n", errmess); |
05392bbc JH |
4845 | break; |
4846 | } | |
4847 | ||
4848 | if (recipient_domain == 0) | |
2685d6e0 JH |
4849 | if (!(recipient_domain = qualify_recipient(&address, smtp_cmd_data, |
4850 | US"verify"))) | |
05392bbc | 4851 | break; |
4f6ae5c3 | 4852 | |
05392bbc | 4853 | if ((rc = acl_check(ACL_WHERE_VRFY, address, acl_smtp_vrfy, |
4f6ae5c3 JH |
4854 | &user_msg, &log_msg)) != OK) |
4855 | done = smtp_handle_acl_fail(ACL_WHERE_VRFY, rc, user_msg, log_msg); | |
059ec3d9 | 4856 | else |
4f6ae5c3 | 4857 | { |
05392bbc JH |
4858 | uschar * s = NULL; |
4859 | address_item * addr = deliver_make_addr(address, FALSE); | |
059ec3d9 | 4860 | |
4f6ae5c3 JH |
4861 | switch(verify_address(addr, NULL, vopt_is_recipient | vopt_qualify, -1, |
4862 | -1, -1, NULL, NULL, NULL)) | |
4863 | { | |
4864 | case OK: | |
4865 | s = string_sprintf("250 <%s> is deliverable", address); | |
4866 | break; | |
059ec3d9 | 4867 | |
4f6ae5c3 JH |
4868 | case DEFER: |
4869 | s = (addr->user_message != NULL)? | |
4870 | string_sprintf("451 <%s> %s", address, addr->user_message) : | |
4871 | string_sprintf("451 Cannot resolve <%s> at this time", address); | |
4872 | break; | |
059ec3d9 | 4873 | |
4f6ae5c3 JH |
4874 | case FAIL: |
4875 | s = (addr->user_message != NULL)? | |
4876 | string_sprintf("550 <%s> %s", address, addr->user_message) : | |
4877 | string_sprintf("550 <%s> is not deliverable", address); | |
4878 | log_write(0, LOG_MAIN, "VRFY failed for %s %s", | |
4879 | smtp_cmd_argument, host_and_ident(TRUE)); | |
4880 | break; | |
4881 | } | |
4882 | ||
4883 | smtp_printf("%s\r\n", s); | |
4884 | } | |
4885 | break; | |
059ec3d9 | 4886 | } |
059ec3d9 PH |
4887 | |
4888 | ||
4889 | case EXPN_CMD: | |
b4ed4da0 | 4890 | HAD(SCH_EXPN); |
64ffc24f | 4891 | rc = acl_check(ACL_WHERE_EXPN, NULL, acl_smtp_expn, &user_msg, &log_msg); |
059ec3d9 PH |
4892 | if (rc != OK) |
4893 | done = smtp_handle_acl_fail(ACL_WHERE_EXPN, rc, user_msg, log_msg); | |
4894 | else | |
4895 | { | |
4896 | BOOL save_log_testing_mode = log_testing_mode; | |
4897 | address_test_mode = log_testing_mode = TRUE; | |
ca86f471 | 4898 | (void) verify_address(deliver_make_addr(smtp_cmd_data, FALSE), |
64ffc24f PH |
4899 | smtp_out, vopt_is_recipient | vopt_qualify | vopt_expn, -1, -1, -1, |
4900 | NULL, NULL, NULL); | |
059ec3d9 PH |
4901 | address_test_mode = FALSE; |
4902 | log_testing_mode = save_log_testing_mode; /* true for -bh */ | |
4903 | } | |
4904 | break; | |
4905 | ||
4906 | ||
4907 | #ifdef SUPPORT_TLS | |
4908 | ||
4909 | case STARTTLS_CMD: | |
b4ed4da0 | 4910 | HAD(SCH_STARTTLS); |
059ec3d9 PH |
4911 | if (!tls_advertised) |
4912 | { | |
4913 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
4914 | US"STARTTLS command used when not advertised"); | |
4915 | break; | |
4916 | } | |
4917 | ||
4918 | /* Apply an ACL check if one is defined */ | |
4919 | ||
4f6ae5c3 JH |
4920 | if ( acl_smtp_starttls |
4921 | && (rc = acl_check(ACL_WHERE_STARTTLS, NULL, acl_smtp_starttls, | |
4922 | &user_msg, &log_msg)) != OK | |
4923 | ) | |
059ec3d9 | 4924 | { |
4f6ae5c3 JH |
4925 | done = smtp_handle_acl_fail(ACL_WHERE_STARTTLS, rc, user_msg, log_msg); |
4926 | break; | |
059ec3d9 PH |
4927 | } |
4928 | ||
4929 | /* RFC 2487 is not clear on when this command may be sent, though it | |
4930 | does state that all information previously obtained from the client | |
4931 | must be discarded if a TLS session is started. It seems reasonble to | |
4932 | do an implied RSET when STARTTLS is received. */ | |
4933 | ||
4934 | incomplete_transaction_log(US"STARTTLS"); | |
4935 | smtp_reset(reset_point); | |
4936 | toomany = FALSE; | |
4937 | cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = FALSE; | |
4938 | ||
da80c2a8 PP |
4939 | /* There's an attack where more data is read in past the STARTTLS command |
4940 | before TLS is negotiated, then assumed to be part of the secure session | |
4941 | when used afterwards; we use segregated input buffers, so are not | |
4942 | vulnerable, but we want to note when it happens and, for sheer paranoia, | |
4943 | ensure that the buffer is "wiped". | |
4944 | Pipelining sync checks will normally have protected us too, unless disabled | |
4945 | by configuration. */ | |
4946 | ||
4947 | if (receive_smtp_buffered()) | |
4948 | { | |
4949 | DEBUG(D_any) | |
18481de3 | 4950 | debug_printf("Non-empty input buffer after STARTTLS; naive attack?\n"); |
817d9f57 | 4951 | if (tls_in.active < 0) |
da80c2a8 PP |
4952 | smtp_inend = smtp_inptr = smtp_inbuffer; |
4953 | /* and if TLS is already active, tls_server_start() should fail */ | |
4954 | } | |
4955 | ||
4e7ee012 PP |
4956 | /* There is nothing we value in the input buffer and if TLS is succesfully |
4957 | negotiated, we won't use this buffer again; if TLS fails, we'll just read | |
4958 | fresh content into it. The buffer contains arbitrary content from an | |
4959 | untrusted remote source; eg: NOOP <shellcode>\r\nSTARTTLS\r\n | |
4960 | It seems safest to just wipe away the content rather than leave it as a | |
4961 | target to jump to. */ | |
4962 | ||
4963 | memset(smtp_inbuffer, 0, in_buffer_size); | |
4964 | ||
059ec3d9 PH |
4965 | /* Attempt to start up a TLS session, and if successful, discard all |
4966 | knowledge that was obtained previously. At least, that's what the RFC says, | |
4967 | and that's what happens by default. However, in order to work round YAEB, | |
4968 | there is an option to remember the esmtp state. Sigh. | |
4969 | ||
4970 | We must allow for an extra EHLO command and an extra AUTH command after | |
4971 | STARTTLS that don't add to the nonmail command count. */ | |
4972 | ||
17c76198 | 4973 | if ((rc = tls_server_start(tls_require_ciphers)) == OK) |
059ec3d9 PH |
4974 | { |
4975 | if (!tls_remember_esmtp) | |
4976 | helo_seen = esmtp = auth_advertised = pipelining_advertised = FALSE; | |
4977 | cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE; | |
4978 | cmd_list[CMD_LIST_AUTH].is_mail_cmd = TRUE; | |
b3ef41c9 | 4979 | cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE; |
059ec3d9 PH |
4980 | if (sender_helo_name != NULL) |
4981 | { | |
4982 | store_free(sender_helo_name); | |
4983 | sender_helo_name = NULL; | |
4984 | host_build_sender_fullhost(); /* Rebuild */ | |
4985 | set_process_info("handling incoming TLS connection from %s", | |
4986 | host_and_ident(FALSE)); | |
4987 | } | |
e524074d JH |
4988 | received_protocol = |
4989 | (sender_host_address ? protocols : protocols_local) | |
4990 | [ (esmtp | |
4991 | ? pextend + (sender_host_authenticated ? pauthed : 0) | |
4992 | : pnormal) | |
4993 | + (tls_in.active >= 0 ? pcrpted : 0) | |
4994 | ]; | |
059ec3d9 PH |
4995 | |
4996 | sender_host_authenticated = NULL; | |
4997 | authenticated_id = NULL; | |
4998 | sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING; | |
4999 | DEBUG(D_tls) debug_printf("TLS active\n"); | |
5000 | break; /* Successful STARTTLS */ | |
5001 | } | |
5002 | ||
5003 | /* Some local configuration problem was discovered before actually trying | |
5004 | to do a TLS handshake; give a temporary error. */ | |
5005 | ||
5006 | else if (rc == DEFER) | |
5007 | { | |
5008 | smtp_printf("454 TLS currently unavailable\r\n"); | |
5009 | break; | |
5010 | } | |
5011 | ||
5012 | /* Hard failure. Reject everything except QUIT or closed connection. One | |
817d9f57 | 5013 | cause for failure is a nested STARTTLS, in which case tls_in.active remains |
059ec3d9 PH |
5014 | set, but we must still reject all incoming commands. */ |
5015 | ||
5016 | DEBUG(D_tls) debug_printf("TLS failed to start\n"); | |
60d10ce7 | 5017 | while (done <= 0) switch(smtp_read_command(FALSE)) |
059ec3d9 | 5018 | { |
60d10ce7 JH |
5019 | case EOF_CMD: |
5020 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by EOF", | |
5021 | smtp_get_connection_info()); | |
5022 | smtp_notquit_exit(US"tls-failed", NULL, NULL); | |
5023 | done = 2; | |
5024 | break; | |
8f128379 | 5025 | |
60d10ce7 JH |
5026 | /* It is perhaps arguable as to which exit ACL should be called here, |
5027 | but as it is probably a situation that almost never arises, it | |
5028 | probably doesn't matter. We choose to call the real QUIT ACL, which in | |
5029 | some sense is perhaps "right". */ | |
5030 | ||
5031 | case QUIT_CMD: | |
5032 | user_msg = NULL; | |
5033 | if ( acl_smtp_quit | |
5034 | && ((rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, &user_msg, | |
5035 | &log_msg)) == ERROR)) | |
5036 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s", | |
5037 | log_msg); | |
5038 | if (user_msg) | |
5039 | smtp_respond(US"221", 3, TRUE, user_msg); | |
5040 | else | |
5041 | smtp_printf("221 %s closing connection\r\n", smtp_active_hostname); | |
5042 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT", | |
5043 | smtp_get_connection_info()); | |
5044 | done = 2; | |
5045 | break; | |
059ec3d9 | 5046 | |
60d10ce7 JH |
5047 | default: |
5048 | smtp_printf("554 Security failure\r\n"); | |
5049 | break; | |
059ec3d9 | 5050 | } |
817d9f57 | 5051 | tls_close(TRUE, TRUE); |
059ec3d9 PH |
5052 | break; |
5053 | #endif | |
5054 | ||
5055 | ||
5056 | /* The ACL for QUIT is provided for gathering statistical information or | |
5057 | similar; it does not affect the response code, but it can supply a custom | |
5058 | message. */ | |
5059 | ||
5060 | case QUIT_CMD: | |
7e3ce68e | 5061 | smtp_quit_handler(&user_msg, &log_msg); |
059ec3d9 | 5062 | done = 2; |
059ec3d9 PH |
5063 | break; |
5064 | ||
5065 | ||
5066 | case RSET_CMD: | |
7e3ce68e | 5067 | smtp_rset_handler(); |
059ec3d9 PH |
5068 | smtp_reset(reset_point); |
5069 | toomany = FALSE; | |
059ec3d9 PH |
5070 | break; |
5071 | ||
5072 | ||
5073 | case NOOP_CMD: | |
b4ed4da0 | 5074 | HAD(SCH_NOOP); |
059ec3d9 PH |
5075 | smtp_printf("250 OK\r\n"); |
5076 | break; | |
5077 | ||
5078 | ||
b43a74ea PH |
5079 | /* Show ETRN/EXPN/VRFY if there's an ACL for checking hosts; if actually |
5080 | used, a check will be done for permitted hosts. Show STARTTLS only if not | |
5081 | already in a TLS session and if it would be advertised in the EHLO | |
5082 | response. */ | |
059ec3d9 PH |
5083 | |
5084 | case HELP_CMD: | |
b4ed4da0 | 5085 | HAD(SCH_HELP); |
059ec3d9 PH |
5086 | smtp_printf("214-Commands supported:\r\n"); |
5087 | { | |
5088 | uschar buffer[256]; | |
5089 | buffer[0] = 0; | |
5090 | Ustrcat(buffer, " AUTH"); | |
5091 | #ifdef SUPPORT_TLS | |
817d9f57 | 5092 | if (tls_in.active < 0 && |
b43a74ea PH |
5093 | verify_check_host(&tls_advertise_hosts) != FAIL) |
5094 | Ustrcat(buffer, " STARTTLS"); | |
059ec3d9 | 5095 | #endif |
7e3ce68e | 5096 | Ustrcat(buffer, " HELO EHLO MAIL RCPT DATA BDAT"); |
059ec3d9 PH |
5097 | Ustrcat(buffer, " NOOP QUIT RSET HELP"); |
5098 | if (acl_smtp_etrn != NULL) Ustrcat(buffer, " ETRN"); | |
5099 | if (acl_smtp_expn != NULL) Ustrcat(buffer, " EXPN"); | |
5100 | if (acl_smtp_vrfy != NULL) Ustrcat(buffer, " VRFY"); | |
5101 | smtp_printf("214%s\r\n", buffer); | |
5102 | } | |
5103 | break; | |
5104 | ||
5105 | ||
5106 | case EOF_CMD: | |
5107 | incomplete_transaction_log(US"connection lost"); | |
8f128379 PH |
5108 | smtp_notquit_exit(US"connection-lost", US"421", |
5109 | US"%s lost input connection", smtp_active_hostname); | |
059ec3d9 PH |
5110 | |
5111 | /* Don't log by default unless in the middle of a message, as some mailers | |
5112 | just drop the call rather than sending QUIT, and it clutters up the logs. | |
5113 | */ | |
5114 | ||
5115 | if (sender_address != NULL || recipients_count > 0) | |
5116 | log_write(L_lost_incoming_connection, | |
5117 | LOG_MAIN, | |
5118 | "unexpected %s while reading SMTP command from %s%s", | |
5119 | sender_host_unknown? "EOF" : "disconnection", | |
5120 | host_and_ident(FALSE), smtp_read_error); | |
5121 | ||
5122 | else log_write(L_smtp_connection, LOG_MAIN, "%s lost%s", | |
5123 | smtp_get_connection_info(), smtp_read_error); | |
5124 | ||
5125 | done = 1; | |
5126 | break; | |
5127 | ||
5128 | ||
5129 | case ETRN_CMD: | |
b4ed4da0 | 5130 | HAD(SCH_ETRN); |
059ec3d9 PH |
5131 | if (sender_address != NULL) |
5132 | { | |
5133 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
5134 | US"ETRN is not permitted inside a transaction"); | |
5135 | break; | |
5136 | } | |
5137 | ||
3ee512ff | 5138 | log_write(L_etrn, LOG_MAIN, "ETRN %s received from %s", smtp_cmd_argument, |
059ec3d9 PH |
5139 | host_and_ident(FALSE)); |
5140 | ||
4f6ae5c3 JH |
5141 | if ((rc = acl_check(ACL_WHERE_ETRN, NULL, acl_smtp_etrn, |
5142 | &user_msg, &log_msg)) != OK) | |
059ec3d9 PH |
5143 | { |
5144 | done = smtp_handle_acl_fail(ACL_WHERE_ETRN, rc, user_msg, log_msg); | |
5145 | break; | |
5146 | } | |
5147 | ||
5148 | /* Compute the serialization key for this command. */ | |
5149 | ||
ca86f471 | 5150 | etrn_serialize_key = string_sprintf("etrn-%s\n", smtp_cmd_data); |
059ec3d9 PH |
5151 | |
5152 | /* If a command has been specified for running as a result of ETRN, we | |
5153 | permit any argument to ETRN. If not, only the # standard form is permitted, | |
5154 | since that is strictly the only kind of ETRN that can be implemented | |
5155 | according to the RFC. */ | |
5156 | ||
5157 | if (smtp_etrn_command != NULL) | |
5158 | { | |
5159 | uschar *error; | |
5160 | BOOL rc; | |
5161 | etrn_command = smtp_etrn_command; | |
ca86f471 | 5162 | deliver_domain = smtp_cmd_data; |
059ec3d9 PH |
5163 | rc = transport_set_up_command(&argv, smtp_etrn_command, TRUE, 0, NULL, |
5164 | US"ETRN processing", &error); | |
5165 | deliver_domain = NULL; | |
5166 | if (!rc) | |
5167 | { | |
5168 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to set up ETRN command: %s", | |
5169 | error); | |
5170 | smtp_printf("458 Internal failure\r\n"); | |
5171 | break; | |
5172 | } | |
5173 | } | |
5174 | ||
5175 | /* Else set up to call Exim with the -R option. */ | |
5176 | ||
5177 | else | |
5178 | { | |
ca86f471 | 5179 | if (*smtp_cmd_data++ != '#') |
059ec3d9 PH |
5180 | { |
5181 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
5182 | US"argument must begin with #"); | |
5183 | break; | |
5184 | } | |
5185 | etrn_command = US"exim -R"; | |
e37f8a84 JH |
5186 | argv = CUSS child_exec_exim(CEE_RETURN_ARGV, TRUE, NULL, TRUE, |
5187 | *queue_name ? 4 : 2, | |
5188 | US"-R", smtp_cmd_data, | |
5189 | US"-MCG", queue_name); | |
059ec3d9 PH |
5190 | } |
5191 | ||
5192 | /* If we are host-testing, don't actually do anything. */ | |
5193 | ||
5194 | if (host_checking) | |
5195 | { | |
5196 | HDEBUG(D_any) | |
5197 | { | |
5198 | debug_printf("ETRN command is: %s\n", etrn_command); | |
5199 | debug_printf("ETRN command execution skipped\n"); | |
5200 | } | |
4e88a19f PH |
5201 | if (user_msg == NULL) smtp_printf("250 OK\r\n"); |
5202 | else smtp_user_msg(US"250", user_msg); | |
059ec3d9 PH |
5203 | break; |
5204 | } | |
5205 | ||
5206 | ||
5207 | /* If ETRN queue runs are to be serialized, check the database to | |
5208 | ensure one isn't already running. */ | |
5209 | ||
e8ae7214 | 5210 | if (smtp_etrn_serialize && !enq_start(etrn_serialize_key, 1)) |
059ec3d9 | 5211 | { |
ca86f471 | 5212 | smtp_printf("458 Already processing %s\r\n", smtp_cmd_data); |
059ec3d9 PH |
5213 | break; |
5214 | } | |
5215 | ||
5216 | /* Fork a child process and run the command. We don't want to have to | |
5217 | wait for the process at any point, so set SIGCHLD to SIG_IGN before | |
5218 | forking. It should be set that way anyway for external incoming SMTP, | |
5219 | but we save and restore to be tidy. If serialization is required, we | |
5220 | actually run the command in yet another process, so we can wait for it | |
5221 | to complete and then remove the serialization lock. */ | |
5222 | ||
5223 | oldsignal = signal(SIGCHLD, SIG_IGN); | |
5224 | ||
5225 | if ((pid = fork()) == 0) | |
5226 | { | |
f1e894f3 PH |
5227 | smtp_input = FALSE; /* This process is not associated with the */ |
5228 | (void)fclose(smtp_in); /* SMTP call any more. */ | |
5229 | (void)fclose(smtp_out); | |
059ec3d9 PH |
5230 | |
5231 | signal(SIGCHLD, SIG_DFL); /* Want to catch child */ | |
5232 | ||
5233 | /* If not serializing, do the exec right away. Otherwise, fork down | |
5234 | into another process. */ | |
5235 | ||
5236 | if (!smtp_etrn_serialize || (pid = fork()) == 0) | |
5237 | { | |
5238 | DEBUG(D_exec) debug_print_argv(argv); | |
5239 | exim_nullstd(); /* Ensure std{in,out,err} exist */ | |
5240 | execv(CS argv[0], (char *const *)argv); | |
5241 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "exec of \"%s\" (ETRN) failed: %s", | |
5242 | etrn_command, strerror(errno)); | |
5243 | _exit(EXIT_FAILURE); /* paranoia */ | |
5244 | } | |
5245 | ||
5246 | /* Obey this if smtp_serialize and the 2nd fork yielded non-zero. That | |
5247 | is, we are in the first subprocess, after forking again. All we can do | |
5248 | for a failing fork is to log it. Otherwise, wait for the 2nd process to | |
5249 | complete, before removing the serialization. */ | |
5250 | ||
5251 | if (pid < 0) | |
5252 | log_write(0, LOG_MAIN|LOG_PANIC, "2nd fork for serialized ETRN " | |
5253 | "failed: %s", strerror(errno)); | |
5254 | else | |
5255 | { | |
5256 | int status; | |
5257 | DEBUG(D_any) debug_printf("waiting for serialized ETRN process %d\n", | |
5258 | (int)pid); | |
5259 | (void)wait(&status); | |
5260 | DEBUG(D_any) debug_printf("serialized ETRN process %d ended\n", | |
5261 | (int)pid); | |
5262 | } | |
5263 | ||
5264 | enq_end(etrn_serialize_key); | |
5265 | _exit(EXIT_SUCCESS); | |
5266 | } | |
5267 | ||
5268 | /* Back in the top level SMTP process. Check that we started a subprocess | |
5269 | and restore the signal state. */ | |
5270 | ||
5271 | if (pid < 0) | |
5272 | { | |
5273 | log_write(0, LOG_MAIN|LOG_PANIC, "fork of process for ETRN failed: %s", | |
5274 | strerror(errno)); | |
5275 | smtp_printf("458 Unable to fork process\r\n"); | |
5276 | if (smtp_etrn_serialize) enq_end(etrn_serialize_key); | |
5277 | } | |
4e88a19f PH |
5278 | else |
5279 | { | |
5280 | if (user_msg == NULL) smtp_printf("250 OK\r\n"); | |
5281 | else smtp_user_msg(US"250", user_msg); | |
5282 | } | |
059ec3d9 PH |
5283 | |
5284 | signal(SIGCHLD, oldsignal); | |
5285 | break; | |
5286 | ||
5287 | ||
5288 | case BADARG_CMD: | |
5289 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
5290 | US"unexpected argument data"); | |
5291 | break; | |
5292 | ||
5293 | ||
5294 | /* This currently happens only for NULLs, but could be extended. */ | |
5295 | ||
5296 | case BADCHAR_CMD: | |
5297 | done = synprot_error(L_smtp_syntax_error, 0, NULL, /* Just logs */ | |
5298 | US"NULL character(s) present (shown as '?')"); | |
5299 | smtp_printf("501 NULL characters are not allowed in SMTP commands\r\n"); | |
5300 | break; | |
5301 | ||
5302 | ||
5303 | case BADSYN_CMD: | |
a14e5636 | 5304 | SYNC_FAILURE: |
059ec3d9 PH |
5305 | if (smtp_inend >= smtp_inbuffer + in_buffer_size) |
5306 | smtp_inend = smtp_inbuffer + in_buffer_size - 1; | |
5307 | c = smtp_inend - smtp_inptr; | |
5308 | if (c > 150) c = 150; | |
5309 | smtp_inptr[c] = 0; | |
5310 | incomplete_transaction_log(US"sync failure"); | |
3af76a81 | 5311 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol synchronization error " |
059ec3d9 PH |
5312 | "(next input sent too soon: pipelining was%s advertised): " |
5313 | "rejected \"%s\" %s next input=\"%s\"", | |
5314 | pipelining_advertised? "" : " not", | |
3ee512ff | 5315 | smtp_cmd_buffer, host_and_ident(TRUE), |
059ec3d9 | 5316 | string_printing(smtp_inptr)); |
8f128379 PH |
5317 | smtp_notquit_exit(US"synchronization-error", US"554", |
5318 | US"SMTP synchronization error"); | |
059ec3d9 PH |
5319 | done = 1; /* Pretend eof - drops connection */ |
5320 | break; | |
5321 | ||
5322 | ||
5323 | case TOO_MANY_NONMAIL_CMD: | |
ca86f471 PH |
5324 | s = smtp_cmd_buffer; |
5325 | while (*s != 0 && !isspace(*s)) s++; | |
059ec3d9 PH |
5326 | incomplete_transaction_log(US"too many non-mail commands"); |
5327 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
5328 | "nonmail commands (last was \"%.*s\")", host_and_ident(FALSE), | |
6d9cfc47 | 5329 | (int)(s - smtp_cmd_buffer), smtp_cmd_buffer); |
8f128379 | 5330 | smtp_notquit_exit(US"bad-commands", US"554", US"Too many nonmail commands"); |
059ec3d9 PH |
5331 | done = 1; /* Pretend eof - drops connection */ |
5332 | break; | |
5333 | ||
cee5f132 | 5334 | #ifdef SUPPORT_PROXY |
a3c86431 TL |
5335 | case PROXY_FAIL_IGNORE_CMD: |
5336 | smtp_printf("503 Command refused, required Proxy negotiation failed\r\n"); | |
5337 | break; | |
cee5f132 | 5338 | #endif |
059ec3d9 PH |
5339 | |
5340 | default: | |
5341 | if (unknown_command_count++ >= smtp_max_unknown_commands) | |
5342 | { | |
5343 | log_write(L_smtp_syntax_error, LOG_MAIN, | |
5344 | "SMTP syntax error in \"%s\" %s %s", | |
3ee512ff | 5345 | string_printing(smtp_cmd_buffer), host_and_ident(TRUE), |
059ec3d9 PH |
5346 | US"unrecognized command"); |
5347 | incomplete_transaction_log(US"unrecognized command"); | |
8f128379 PH |
5348 | smtp_notquit_exit(US"bad-commands", US"500", |
5349 | US"Too many unrecognized commands"); | |
059ec3d9 PH |
5350 | done = 2; |
5351 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
5352 | "unrecognized commands (last was \"%s\")", host_and_ident(FALSE), | |
0ebc4d69 | 5353 | string_printing(smtp_cmd_buffer)); |
059ec3d9 PH |
5354 | } |
5355 | else | |
5356 | done = synprot_error(L_smtp_syntax_error, 500, NULL, | |
5357 | US"unrecognized command"); | |
5358 | break; | |
5359 | } | |
5360 | ||
5361 | /* This label is used by goto's inside loops that want to break out to | |
5362 | the end of the command-processing loop. */ | |
5363 | ||
5364 | COMMAND_LOOP: | |
5365 | last_was_rej_mail = was_rej_mail; /* Remember some last commands for */ | |
5366 | last_was_rcpt = was_rcpt; /* protocol error handling */ | |
5367 | continue; | |
5368 | } | |
5369 | ||
5370 | return done - 2; /* Convert yield values */ | |
5371 | } | |
5372 | ||
e45a1c37 JH |
5373 | /* vi: aw ai sw=2 |
5374 | */ | |
059ec3d9 | 5375 | /* End of smtp_in.c */ |