Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
3386088d | 5 | /* Copyright (c) University of Cambridge 1995 - 2015 */ |
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 | |
e2ca7082 PP |
40 | the data can be quite long. More recently this value was 2048 in Exim; |
41 | however, RFC 4954 (circa 2007) recommends 12288 bytes to handle AUTH. Clients | |
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 | |
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 | ||
85 | /* This is a dummy to identify the non-sync commands when not pipelining */ | |
86 | ||
87 | NON_SYNC_CMD_NON_PIPELINING, | |
88 | ||
89 | /* I have been unable to find a statement about the use of pipelining | |
90 | with AUTH, so to be on the safe side it is here, though I kind of feel | |
91 | it should be up there with the synchronized commands. */ | |
92 | ||
93 | AUTH_CMD, | |
94 | ||
95 | /* I'm not sure about these, but I don't think they matter. */ | |
96 | ||
97 | QUIT_CMD, HELP_CMD, | |
98 | ||
a3c86431 TL |
99 | #ifdef EXPERIMENTAL_PROXY |
100 | PROXY_FAIL_IGNORE_CMD, | |
101 | #endif | |
102 | ||
059ec3d9 PH |
103 | /* These are specials that don't correspond to actual commands */ |
104 | ||
105 | EOF_CMD, OTHER_CMD, BADARG_CMD, BADCHAR_CMD, BADSYN_CMD, | |
106 | TOO_MANY_NONMAIL_CMD }; | |
107 | ||
108 | ||
b4ed4da0 PH |
109 | /* This is a convenience macro for adding the identity of an SMTP command |
110 | to the circular buffer that holds a list of the last n received. */ | |
111 | ||
112 | #define HAD(n) \ | |
113 | smtp_connection_had[smtp_ch_index++] = n; \ | |
114 | if (smtp_ch_index >= SMTP_HBUFF_SIZE) smtp_ch_index = 0 | |
115 | ||
059ec3d9 PH |
116 | |
117 | /************************************************* | |
118 | * Local static variables * | |
119 | *************************************************/ | |
120 | ||
121 | static auth_instance *authenticated_by; | |
122 | static BOOL auth_advertised; | |
123 | #ifdef SUPPORT_TLS | |
124 | static BOOL tls_advertised; | |
125 | #endif | |
6c1c3d1d | 126 | static BOOL dsn_advertised; |
059ec3d9 PH |
127 | static BOOL esmtp; |
128 | static BOOL helo_required = FALSE; | |
129 | static BOOL helo_verify = FALSE; | |
130 | static BOOL helo_seen; | |
131 | static BOOL helo_accept_junk; | |
132 | static BOOL count_nonmail; | |
133 | static BOOL pipelining_advertised; | |
2679d413 PH |
134 | static BOOL rcpt_smtp_response_same; |
135 | static BOOL rcpt_in_progress; | |
059ec3d9 | 136 | static int nonmail_command_count; |
8f128379 | 137 | static BOOL smtp_exit_function_called = 0; |
d1a13eea JH |
138 | #ifdef EXPERIMENTAL_INTERNATIONAL |
139 | static BOOL smtputf8_advertised; | |
140 | #endif | |
059ec3d9 PH |
141 | static int synprot_error_count; |
142 | static int unknown_command_count; | |
143 | static int sync_cmd_limit; | |
144 | static int smtp_write_error = 0; | |
145 | ||
2679d413 | 146 | static uschar *rcpt_smtp_response; |
ca86f471 PH |
147 | static uschar *smtp_data_buffer; |
148 | static uschar *smtp_cmd_data; | |
149 | ||
059ec3d9 PH |
150 | /* We need to know the position of RSET, HELO, EHLO, AUTH, and STARTTLS. Their |
151 | final fields of all except AUTH are forced TRUE at the start of a new message | |
152 | setup, to allow one of each between messages that is not counted as a nonmail | |
153 | command. (In fact, only one of HELO/EHLO is not counted.) Also, we have to | |
154 | allow a new EHLO after starting up TLS. | |
155 | ||
156 | AUTH is "falsely" labelled as a mail command initially, so that it doesn't get | |
157 | counted. However, the flag is changed when AUTH is received, so that multiple | |
158 | failing AUTHs will eventually hit the limit. After a successful AUTH, another | |
159 | AUTH is already forbidden. After a TLS session is started, AUTH's flag is again | |
160 | forced TRUE, to allow for the re-authentication that can happen at that point. | |
161 | ||
162 | QUIT is also "falsely" labelled as a mail command so that it doesn't up the | |
2f460950 JH |
163 | count of non-mail commands and possibly provoke an error. |
164 | ||
165 | tls_auth is a pseudo-command, never expected in input. It is activated | |
166 | on TLS startup and looks for a tls authenticator. */ | |
059ec3d9 PH |
167 | |
168 | static smtp_cmd_list cmd_list[] = { | |
d1a13eea JH |
169 | /* name len cmd has_arg is_mail_cmd */ |
170 | ||
059ec3d9 PH |
171 | { "rset", sizeof("rset")-1, RSET_CMD, FALSE, FALSE }, /* First */ |
172 | { "helo", sizeof("helo")-1, HELO_CMD, TRUE, FALSE }, | |
173 | { "ehlo", sizeof("ehlo")-1, EHLO_CMD, TRUE, FALSE }, | |
174 | { "auth", sizeof("auth")-1, AUTH_CMD, TRUE, TRUE }, | |
175 | #ifdef SUPPORT_TLS | |
176 | { "starttls", sizeof("starttls")-1, STARTTLS_CMD, FALSE, FALSE }, | |
b3ef41c9 | 177 | { "tls_auth", 0, TLS_AUTH_CMD, FALSE, TRUE }, |
059ec3d9 PH |
178 | #endif |
179 | ||
180 | /* If you change anything above here, also fix the definitions below. */ | |
181 | ||
182 | { "mail from:", sizeof("mail from:")-1, MAIL_CMD, TRUE, TRUE }, | |
183 | { "rcpt to:", sizeof("rcpt to:")-1, RCPT_CMD, TRUE, TRUE }, | |
184 | { "data", sizeof("data")-1, DATA_CMD, FALSE, TRUE }, | |
185 | { "quit", sizeof("quit")-1, QUIT_CMD, FALSE, TRUE }, | |
186 | { "noop", sizeof("noop")-1, NOOP_CMD, TRUE, FALSE }, | |
187 | { "etrn", sizeof("etrn")-1, ETRN_CMD, TRUE, FALSE }, | |
188 | { "vrfy", sizeof("vrfy")-1, VRFY_CMD, TRUE, FALSE }, | |
189 | { "expn", sizeof("expn")-1, EXPN_CMD, TRUE, FALSE }, | |
190 | { "help", sizeof("help")-1, HELP_CMD, TRUE, FALSE } | |
191 | }; | |
192 | ||
193 | static smtp_cmd_list *cmd_list_end = | |
194 | cmd_list + sizeof(cmd_list)/sizeof(smtp_cmd_list); | |
195 | ||
196 | #define CMD_LIST_RSET 0 | |
197 | #define CMD_LIST_HELO 1 | |
198 | #define CMD_LIST_EHLO 2 | |
199 | #define CMD_LIST_AUTH 3 | |
200 | #define CMD_LIST_STARTTLS 4 | |
b3ef41c9 | 201 | #define CMD_LIST_TLS_AUTH 5 |
059ec3d9 | 202 | |
b4ed4da0 PH |
203 | /* This list of names is used for performing the smtp_no_mail logging action. |
204 | It must be kept in step with the SCH_xxx enumerations. */ | |
205 | ||
206 | static uschar *smtp_names[] = | |
207 | { | |
208 | US"NONE", US"AUTH", US"DATA", US"EHLO", US"ETRN", US"EXPN", US"HELO", | |
209 | US"HELP", US"MAIL", US"NOOP", US"QUIT", US"RCPT", US"RSET", US"STARTTLS", | |
210 | US"VRFY" }; | |
211 | ||
e524074d | 212 | static uschar *protocols_local[] = { |
981756db PH |
213 | US"local-smtp", /* HELO */ |
214 | US"local-smtps", /* The rare case EHLO->STARTTLS->HELO */ | |
215 | US"local-esmtp", /* EHLO */ | |
216 | US"local-esmtps", /* EHLO->STARTTLS->EHLO */ | |
217 | US"local-esmtpa", /* EHLO->AUTH */ | |
218 | US"local-esmtpsa" /* EHLO->STARTTLS->EHLO->AUTH */ | |
059ec3d9 | 219 | }; |
e524074d JH |
220 | static uschar *protocols[] = { |
221 | US"smtp", /* HELO */ | |
222 | US"smtps", /* The rare case EHLO->STARTTLS->HELO */ | |
223 | US"esmtp", /* EHLO */ | |
224 | US"esmtps", /* EHLO->STARTTLS->EHLO */ | |
225 | US"esmtpa", /* EHLO->AUTH */ | |
226 | US"esmtpsa" /* EHLO->STARTTLS->EHLO->AUTH */ | |
227 | }; | |
059ec3d9 PH |
228 | |
229 | #define pnormal 0 | |
981756db PH |
230 | #define pextend 2 |
231 | #define pcrpted 1 /* added to pextend or pnormal */ | |
232 | #define pauthed 2 /* added to pextend */ | |
059ec3d9 | 233 | |
d27f98fe TL |
234 | /* Sanity check and validate optional args to MAIL FROM: envelope */ |
235 | enum { | |
2ef7ed08 | 236 | ENV_MAIL_OPT_NULL, |
d27f98fe | 237 | ENV_MAIL_OPT_SIZE, ENV_MAIL_OPT_BODY, ENV_MAIL_OPT_AUTH, |
8ccd00b1 | 238 | #ifndef DISABLE_PRDR |
fd98a5c6 | 239 | ENV_MAIL_OPT_PRDR, |
6c1c3d1d | 240 | #endif |
6c1c3d1d | 241 | ENV_MAIL_OPT_RET, ENV_MAIL_OPT_ENVID, |
d1a13eea JH |
242 | #ifdef EXPERIMENTAL_INTERNATIONAL |
243 | ENV_MAIL_OPT_UTF8, | |
244 | #endif | |
d27f98fe TL |
245 | }; |
246 | typedef struct { | |
247 | uschar * name; /* option requested during MAIL cmd */ | |
248 | int value; /* enum type */ | |
249 | BOOL need_value; /* TRUE requires value (name=value pair format) | |
250 | FALSE is a singleton */ | |
251 | } env_mail_type_t; | |
252 | static env_mail_type_t env_mail_type_list[] = { | |
253 | { US"SIZE", ENV_MAIL_OPT_SIZE, TRUE }, | |
254 | { US"BODY", ENV_MAIL_OPT_BODY, TRUE }, | |
255 | { US"AUTH", ENV_MAIL_OPT_AUTH, TRUE }, | |
8ccd00b1 | 256 | #ifndef DISABLE_PRDR |
fd98a5c6 | 257 | { US"PRDR", ENV_MAIL_OPT_PRDR, FALSE }, |
6c1c3d1d | 258 | #endif |
6c1c3d1d WB |
259 | { US"RET", ENV_MAIL_OPT_RET, TRUE }, |
260 | { US"ENVID", ENV_MAIL_OPT_ENVID, TRUE }, | |
d1a13eea JH |
261 | #ifdef EXPERIMENTAL_INTERNATIONAL |
262 | { US"SMTPUTF8",ENV_MAIL_OPT_UTF8, FALSE }, /* rfc6531 */ | |
263 | #endif | |
2ef7ed08 HSHR |
264 | /* keep this the last entry */ |
265 | { US"NULL", ENV_MAIL_OPT_NULL, FALSE }, | |
d27f98fe TL |
266 | }; |
267 | ||
059ec3d9 PH |
268 | /* When reading SMTP from a remote host, we have to use our own versions of the |
269 | C input-reading functions, in order to be able to flush the SMTP output only | |
270 | when about to read more data from the socket. This is the only way to get | |
271 | optimal performance when the client is using pipelining. Flushing for every | |
272 | command causes a separate packet and reply packet each time; saving all the | |
273 | responses up (when pipelining) combines them into one packet and one response. | |
274 | ||
275 | For simplicity, these functions are used for *all* SMTP input, not only when | |
276 | receiving over a socket. However, after setting up a secure socket (SSL), input | |
277 | is read via the OpenSSL library, and another set of functions is used instead | |
278 | (see tls.c). | |
279 | ||
280 | These functions are set in the receive_getc etc. variables and called with the | |
281 | same interface as the C functions. However, since there can only ever be | |
282 | one incoming SMTP call, we just use a single buffer and flags. There is no need | |
283 | to implement a complicated private FILE-like structure.*/ | |
284 | ||
285 | static uschar *smtp_inbuffer; | |
286 | static uschar *smtp_inptr; | |
287 | static uschar *smtp_inend; | |
288 | static int smtp_had_eof; | |
289 | static int smtp_had_error; | |
290 | ||
291 | ||
292 | /************************************************* | |
293 | * SMTP version of getc() * | |
294 | *************************************************/ | |
295 | ||
296 | /* This gets the next byte from the SMTP input buffer. If the buffer is empty, | |
297 | it flushes the output, and refills the buffer, with a timeout. The signal | |
298 | handler is set appropriately by the calling function. This function is not used | |
299 | after a connection has negotated itself into an TLS/SSL state. | |
300 | ||
301 | Arguments: none | |
302 | Returns: the next character or EOF | |
303 | */ | |
304 | ||
305 | int | |
306 | smtp_getc(void) | |
307 | { | |
308 | if (smtp_inptr >= smtp_inend) | |
309 | { | |
310 | int rc, save_errno; | |
311 | fflush(smtp_out); | |
312 | if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout); | |
313 | rc = read(fileno(smtp_in), smtp_inbuffer, in_buffer_size); | |
314 | save_errno = errno; | |
315 | alarm(0); | |
316 | if (rc <= 0) | |
317 | { | |
318 | /* Must put the error text in fixed store, because this might be during | |
319 | header reading, where it releases unused store above the header. */ | |
320 | if (rc < 0) | |
321 | { | |
322 | smtp_had_error = save_errno; | |
323 | smtp_read_error = string_copy_malloc( | |
324 | string_sprintf(" (error: %s)", strerror(save_errno))); | |
325 | } | |
326 | else smtp_had_eof = 1; | |
327 | return EOF; | |
328 | } | |
80a47a2c TK |
329 | #ifndef DISABLE_DKIM |
330 | dkim_exim_verify_feed(smtp_inbuffer, rc); | |
331 | #endif | |
059ec3d9 PH |
332 | smtp_inend = smtp_inbuffer + rc; |
333 | smtp_inptr = smtp_inbuffer; | |
334 | } | |
335 | return *smtp_inptr++; | |
336 | } | |
337 | ||
338 | ||
339 | ||
340 | /************************************************* | |
341 | * SMTP version of ungetc() * | |
342 | *************************************************/ | |
343 | ||
344 | /* Puts a character back in the input buffer. Only ever | |
345 | called once. | |
346 | ||
347 | Arguments: | |
348 | ch the character | |
349 | ||
350 | Returns: the character | |
351 | */ | |
352 | ||
353 | int | |
354 | smtp_ungetc(int ch) | |
355 | { | |
356 | *(--smtp_inptr) = ch; | |
357 | return ch; | |
358 | } | |
359 | ||
360 | ||
361 | ||
362 | ||
363 | /************************************************* | |
364 | * SMTP version of feof() * | |
365 | *************************************************/ | |
366 | ||
367 | /* Tests for a previous EOF | |
368 | ||
369 | Arguments: none | |
370 | Returns: non-zero if the eof flag is set | |
371 | */ | |
372 | ||
373 | int | |
374 | smtp_feof(void) | |
375 | { | |
376 | return smtp_had_eof; | |
377 | } | |
378 | ||
379 | ||
380 | ||
381 | ||
382 | /************************************************* | |
383 | * SMTP version of ferror() * | |
384 | *************************************************/ | |
385 | ||
386 | /* Tests for a previous read error, and returns with errno | |
387 | restored to what it was when the error was detected. | |
388 | ||
389 | Arguments: none | |
390 | Returns: non-zero if the error flag is set | |
391 | */ | |
392 | ||
393 | int | |
394 | smtp_ferror(void) | |
395 | { | |
396 | errno = smtp_had_error; | |
397 | return smtp_had_error; | |
398 | } | |
399 | ||
400 | ||
401 | ||
58eb016e PH |
402 | /************************************************* |
403 | * Test for characters in the SMTP buffer * | |
404 | *************************************************/ | |
405 | ||
406 | /* Used at the end of a message | |
407 | ||
408 | Arguments: none | |
409 | Returns: TRUE/FALSE | |
410 | */ | |
411 | ||
412 | BOOL | |
413 | smtp_buffered(void) | |
414 | { | |
415 | return smtp_inptr < smtp_inend; | |
416 | } | |
417 | ||
418 | ||
059ec3d9 PH |
419 | |
420 | /************************************************* | |
421 | * Write formatted string to SMTP channel * | |
422 | *************************************************/ | |
423 | ||
424 | /* This is a separate function so that we don't have to repeat everything for | |
425 | TLS support or debugging. It is global so that the daemon and the | |
426 | authentication functions can use it. It does not return any error indication, | |
427 | because major problems such as dropped connections won't show up till an output | |
428 | flush for non-TLS connections. The smtp_fflush() function is available for | |
429 | checking that: for convenience, TLS output errors are remembered here so that | |
430 | they are also picked up later by smtp_fflush(). | |
431 | ||
432 | Arguments: | |
433 | format format string | |
434 | ... optional arguments | |
435 | ||
436 | Returns: nothing | |
437 | */ | |
438 | ||
439 | void | |
1ba28e2b | 440 | smtp_printf(const char *format, ...) |
059ec3d9 PH |
441 | { |
442 | va_list ap; | |
443 | ||
ce552449 NM |
444 | va_start(ap, format); |
445 | smtp_vprintf(format, ap); | |
446 | va_end(ap); | |
447 | } | |
448 | ||
449 | /* This is split off so that verify.c:respond_printf() can, in effect, call | |
450 | smtp_printf(), bearing in mind that in C a vararg function can't directly | |
fb08281f | 451 | call another vararg function, only a function which accepts a va_list. */ |
ce552449 NM |
452 | |
453 | void | |
1ba28e2b | 454 | smtp_vprintf(const char *format, va_list ap) |
ce552449 | 455 | { |
fb08281f DW |
456 | BOOL yield; |
457 | ||
458 | yield = string_vformat(big_buffer, big_buffer_size, format, ap); | |
ce552449 | 459 | |
059ec3d9 PH |
460 | DEBUG(D_receive) |
461 | { | |
fb08281f DW |
462 | void *reset_point = store_get(0); |
463 | uschar *msg_copy, *cr, *end; | |
464 | msg_copy = string_copy(big_buffer); | |
465 | end = msg_copy + Ustrlen(msg_copy); | |
466 | while ((cr = Ustrchr(msg_copy, '\r')) != NULL) /* lose CRs */ | |
467 | memmove(cr, cr + 1, (end--) - cr); | |
468 | debug_printf("SMTP>> %s", msg_copy); | |
469 | store_reset(reset_point); | |
059ec3d9 PH |
470 | } |
471 | ||
fb08281f | 472 | if (!yield) |
2679d413 PH |
473 | { |
474 | log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_printf()"); | |
475 | smtp_closedown(US"Unexpected error"); | |
476 | exim_exit(EXIT_FAILURE); | |
477 | } | |
2679d413 PH |
478 | |
479 | /* If this is the first output for a (non-batch) RCPT command, see if all RCPTs | |
480 | have had the same. Note: this code is also present in smtp_respond(). It would | |
481 | be tidier to have it only in one place, but when it was added, it was easier to | |
482 | do it that way, so as not to have to mess with the code for the RCPT command, | |
483 | which sometimes uses smtp_printf() and sometimes smtp_respond(). */ | |
484 | ||
485 | if (rcpt_in_progress) | |
486 | { | |
487 | if (rcpt_smtp_response == NULL) | |
488 | rcpt_smtp_response = string_copy(big_buffer); | |
489 | else if (rcpt_smtp_response_same && | |
490 | Ustrcmp(rcpt_smtp_response, big_buffer) != 0) | |
491 | rcpt_smtp_response_same = FALSE; | |
492 | rcpt_in_progress = FALSE; | |
493 | } | |
059ec3d9 | 494 | |
2679d413 | 495 | /* Now write the string */ |
059ec3d9 PH |
496 | |
497 | #ifdef SUPPORT_TLS | |
817d9f57 | 498 | if (tls_in.active >= 0) |
059ec3d9 | 499 | { |
817d9f57 JH |
500 | if (tls_write(TRUE, big_buffer, Ustrlen(big_buffer)) < 0) |
501 | smtp_write_error = -1; | |
059ec3d9 PH |
502 | } |
503 | else | |
504 | #endif | |
505 | ||
2679d413 | 506 | if (fprintf(smtp_out, "%s", big_buffer) < 0) smtp_write_error = -1; |
059ec3d9 PH |
507 | } |
508 | ||
509 | ||
510 | ||
511 | /************************************************* | |
512 | * Flush SMTP out and check for error * | |
513 | *************************************************/ | |
514 | ||
515 | /* This function isn't currently used within Exim (it detects errors when it | |
516 | tries to read the next SMTP input), but is available for use in local_scan(). | |
517 | For non-TLS connections, it flushes the output and checks for errors. For | |
518 | TLS-connections, it checks for a previously-detected TLS write error. | |
519 | ||
520 | Arguments: none | |
521 | Returns: 0 for no error; -1 after an error | |
522 | */ | |
523 | ||
524 | int | |
525 | smtp_fflush(void) | |
526 | { | |
817d9f57 | 527 | if (tls_in.active < 0 && fflush(smtp_out) != 0) smtp_write_error = -1; |
059ec3d9 PH |
528 | return smtp_write_error; |
529 | } | |
530 | ||
531 | ||
532 | ||
533 | /************************************************* | |
534 | * SMTP command read timeout * | |
535 | *************************************************/ | |
536 | ||
537 | /* Signal handler for timing out incoming SMTP commands. This attempts to | |
538 | finish off tidily. | |
539 | ||
540 | Argument: signal number (SIGALRM) | |
541 | Returns: nothing | |
542 | */ | |
543 | ||
544 | static void | |
545 | command_timeout_handler(int sig) | |
546 | { | |
547 | sig = sig; /* Keep picky compilers happy */ | |
548 | log_write(L_lost_incoming_connection, | |
549 | LOG_MAIN, "SMTP command timeout on%s connection from %s", | |
817d9f57 | 550 | (tls_in.active >= 0)? " TLS" : "", |
059ec3d9 PH |
551 | host_and_ident(FALSE)); |
552 | if (smtp_batched_input) | |
553 | moan_smtp_batch(NULL, "421 SMTP command timeout"); /* Does not return */ | |
8f128379 PH |
554 | smtp_notquit_exit(US"command-timeout", US"421", |
555 | US"%s: SMTP command timeout - closing connection", smtp_active_hostname); | |
059ec3d9 PH |
556 | exim_exit(EXIT_FAILURE); |
557 | } | |
558 | ||
559 | ||
560 | ||
561 | /************************************************* | |
562 | * SIGTERM received * | |
563 | *************************************************/ | |
564 | ||
565 | /* Signal handler for handling SIGTERM. Again, try to finish tidily. | |
566 | ||
567 | Argument: signal number (SIGTERM) | |
568 | Returns: nothing | |
569 | */ | |
570 | ||
571 | static void | |
572 | command_sigterm_handler(int sig) | |
573 | { | |
574 | sig = sig; /* Keep picky compilers happy */ | |
575 | log_write(0, LOG_MAIN, "%s closed after SIGTERM", smtp_get_connection_info()); | |
576 | if (smtp_batched_input) | |
577 | moan_smtp_batch(NULL, "421 SIGTERM received"); /* Does not return */ | |
8f128379 PH |
578 | smtp_notquit_exit(US"signal-exit", US"421", |
579 | US"%s: Service not available - closing connection", smtp_active_hostname); | |
059ec3d9 PH |
580 | exim_exit(EXIT_FAILURE); |
581 | } | |
582 | ||
583 | ||
584 | ||
a14e5636 | 585 | |
a3c86431 | 586 | #ifdef EXPERIMENTAL_PROXY |
a3bddaa8 TL |
587 | /************************************************* |
588 | * Restore socket timeout to previous value * | |
589 | *************************************************/ | |
590 | /* If the previous value was successfully retrieved, restore | |
591 | it before returning control to the non-proxy routines | |
592 | ||
593 | Arguments: fd - File descriptor for input | |
594 | get_ok - Successfully retrieved previous values | |
595 | tvtmp - Time struct with previous values | |
596 | vslen - Length of time struct | |
597 | Returns: none | |
598 | */ | |
599 | static void | |
600 | restore_socket_timeout(int fd, int get_ok, struct timeval tvtmp, socklen_t vslen) | |
601 | { | |
602 | if (get_ok == 0) | |
603 | setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&tvtmp, vslen); | |
604 | } | |
605 | ||
a3c86431 TL |
606 | /************************************************* |
607 | * Check if host is required proxy host * | |
608 | *************************************************/ | |
609 | /* The function determines if inbound host will be a regular smtp host | |
610 | or if it is configured that it must use Proxy Protocol. | |
611 | ||
612 | Arguments: none | |
613 | Returns: bool | |
614 | */ | |
615 | ||
616 | static BOOL | |
617 | check_proxy_protocol_host() | |
618 | { | |
619 | int rc; | |
620 | /* Cannot configure local connection as a proxy inbound */ | |
621 | if (sender_host_address == NULL) return proxy_session; | |
622 | ||
623 | rc = verify_check_this_host(&proxy_required_hosts, NULL, NULL, | |
624 | sender_host_address, NULL); | |
625 | if (rc == OK) | |
626 | { | |
627 | DEBUG(D_receive) | |
628 | debug_printf("Detected proxy protocol configured host\n"); | |
629 | proxy_session = TRUE; | |
630 | } | |
631 | return proxy_session; | |
632 | } | |
633 | ||
634 | ||
a3c86431 TL |
635 | /************************************************* |
636 | * Setup host for proxy protocol * | |
637 | *************************************************/ | |
638 | /* The function configures the connection based on a header from the | |
639 | inbound host to use Proxy Protocol. The specification is very exact | |
640 | so exit with an error if do not find the exact required pieces. This | |
641 | includes an incorrect number of spaces separating args. | |
642 | ||
643 | Arguments: none | |
644 | Returns: int | |
645 | */ | |
646 | ||
647 | static BOOL | |
648 | setup_proxy_protocol_host() | |
649 | { | |
650 | union { | |
651 | struct { | |
652 | uschar line[108]; | |
653 | } v1; | |
654 | struct { | |
655 | uschar sig[12]; | |
36719342 TL |
656 | uint8_t ver_cmd; |
657 | uint8_t fam; | |
658 | uint16_t len; | |
a3c86431 TL |
659 | union { |
660 | struct { /* TCP/UDP over IPv4, len = 12 */ | |
661 | uint32_t src_addr; | |
662 | uint32_t dst_addr; | |
663 | uint16_t src_port; | |
664 | uint16_t dst_port; | |
665 | } ip4; | |
666 | struct { /* TCP/UDP over IPv6, len = 36 */ | |
667 | uint8_t src_addr[16]; | |
668 | uint8_t dst_addr[16]; | |
669 | uint16_t src_port; | |
670 | uint16_t dst_port; | |
671 | } ip6; | |
672 | struct { /* AF_UNIX sockets, len = 216 */ | |
673 | uschar src_addr[108]; | |
674 | uschar dst_addr[108]; | |
675 | } unx; | |
676 | } addr; | |
677 | } v2; | |
678 | } hdr; | |
679 | ||
eb57651e TL |
680 | /* Temp variables used in PPv2 address:port parsing */ |
681 | uint16_t tmpport; | |
682 | char tmpip[INET_ADDRSTRLEN]; | |
683 | struct sockaddr_in tmpaddr; | |
684 | char tmpip6[INET6_ADDRSTRLEN]; | |
685 | struct sockaddr_in6 tmpaddr6; | |
686 | ||
687 | int get_ok = 0; | |
a3c86431 | 688 | int size, ret, fd; |
36719342 | 689 | const char v2sig[12] = "\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A"; |
a3c86431 TL |
690 | uschar *iptype; /* To display debug info */ |
691 | struct timeval tv; | |
a3bddaa8 TL |
692 | socklen_t vslen = 0; |
693 | struct timeval tvtmp; | |
694 | ||
695 | vslen = sizeof(struct timeval); | |
a3c86431 TL |
696 | |
697 | fd = fileno(smtp_in); | |
698 | ||
a3bddaa8 TL |
699 | /* Save current socket timeout values */ |
700 | get_ok = getsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&tvtmp, | |
701 | &vslen); | |
702 | ||
a3c86431 TL |
703 | /* Proxy Protocol host must send header within a short time |
704 | (default 3 seconds) or it's considered invalid */ | |
705 | tv.tv_sec = PROXY_NEGOTIATION_TIMEOUT_SEC; | |
706 | tv.tv_usec = PROXY_NEGOTIATION_TIMEOUT_USEC; | |
707 | setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv, | |
708 | sizeof(struct timeval)); | |
a3bddaa8 | 709 | |
a3c86431 TL |
710 | do |
711 | { | |
eb57651e TL |
712 | /* The inbound host was declared to be a Proxy Protocol host, so |
713 | don't do a PEEK into the data, actually slurp it up. */ | |
714 | ret = recv(fd, &hdr, sizeof(hdr), 0); | |
a3c86431 TL |
715 | } |
716 | while (ret == -1 && errno == EINTR); | |
717 | ||
718 | if (ret == -1) | |
a3bddaa8 TL |
719 | { |
720 | restore_socket_timeout(fd, get_ok, tvtmp, vslen); | |
a3c86431 | 721 | return (errno == EAGAIN) ? 0 : ERRNO_PROXYFAIL; |
a3bddaa8 | 722 | } |
a3c86431 TL |
723 | |
724 | if (ret >= 16 && | |
36719342 | 725 | memcmp(&hdr.v2, v2sig, 12) == 0) |
a3c86431 | 726 | { |
36719342 TL |
727 | uint8_t ver, cmd; |
728 | ||
729 | /* May 2014: haproxy combined the version and command into one byte to | |
730 | allow two full bytes for the length field in order to proxy SSL | |
731 | connections. SSL Proxy is not supported in this version of Exim, but | |
732 | must still seperate values here. */ | |
733 | ver = (hdr.v2.ver_cmd & 0xf0) >> 4; | |
734 | cmd = (hdr.v2.ver_cmd & 0x0f); | |
735 | ||
736 | if (ver != 0x02) | |
737 | { | |
738 | DEBUG(D_receive) debug_printf("Invalid Proxy Protocol version: %d\n", ver); | |
739 | goto proxyfail; | |
740 | } | |
a3c86431 | 741 | DEBUG(D_receive) debug_printf("Detected PROXYv2 header\n"); |
36719342 | 742 | /* The v2 header will always be 16 bytes per the spec. */ |
a3c86431 TL |
743 | size = 16 + hdr.v2.len; |
744 | if (ret < size) | |
745 | { | |
36719342 TL |
746 | DEBUG(D_receive) debug_printf("Truncated or too large PROXYv2 header (%d/%d)\n", |
747 | ret, size); | |
a3c86431 TL |
748 | goto proxyfail; |
749 | } | |
36719342 | 750 | switch (cmd) |
a3c86431 TL |
751 | { |
752 | case 0x01: /* PROXY command */ | |
753 | switch (hdr.v2.fam) | |
754 | { | |
eb57651e TL |
755 | case 0x11: /* TCPv4 address type */ |
756 | iptype = US"IPv4"; | |
757 | tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.src_addr; | |
758 | inet_ntop(AF_INET, &(tmpaddr.sin_addr), (char *)&tmpip, sizeof(tmpip)); | |
759 | if (!string_is_ip_address(US tmpip,NULL)) | |
760 | { | |
761 | DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype); | |
a3c86431 | 762 | return ERRNO_PROXYFAIL; |
eb57651e TL |
763 | } |
764 | proxy_host_address = sender_host_address; | |
765 | sender_host_address = string_copy(US tmpip); | |
766 | tmpport = ntohs(hdr.v2.addr.ip4.src_port); | |
767 | proxy_host_port = sender_host_port; | |
768 | sender_host_port = tmpport; | |
769 | /* Save dest ip/port */ | |
770 | tmpaddr.sin_addr.s_addr = hdr.v2.addr.ip4.dst_addr; | |
771 | inet_ntop(AF_INET, &(tmpaddr.sin_addr), (char *)&tmpip, sizeof(tmpip)); | |
772 | if (!string_is_ip_address(US tmpip,NULL)) | |
773 | { | |
774 | DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype); | |
775 | return ERRNO_PROXYFAIL; | |
776 | } | |
777 | proxy_target_address = string_copy(US tmpip); | |
778 | tmpport = ntohs(hdr.v2.addr.ip4.dst_port); | |
779 | proxy_target_port = tmpport; | |
a3c86431 | 780 | goto done; |
eb57651e TL |
781 | case 0x21: /* TCPv6 address type */ |
782 | iptype = US"IPv6"; | |
783 | memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.src_addr, 16); | |
784 | inet_ntop(AF_INET6, &(tmpaddr6.sin6_addr), (char *)&tmpip6, sizeof(tmpip6)); | |
785 | if (!string_is_ip_address(US tmpip6,NULL)) | |
786 | { | |
787 | DEBUG(D_receive) debug_printf("Invalid %s source IP\n", iptype); | |
788 | return ERRNO_PROXYFAIL; | |
789 | } | |
790 | proxy_host_address = sender_host_address; | |
791 | sender_host_address = string_copy(US tmpip6); | |
792 | tmpport = ntohs(hdr.v2.addr.ip6.src_port); | |
793 | proxy_host_port = sender_host_port; | |
794 | sender_host_port = tmpport; | |
795 | /* Save dest ip/port */ | |
796 | memmove(tmpaddr6.sin6_addr.s6_addr, hdr.v2.addr.ip6.dst_addr, 16); | |
797 | inet_ntop(AF_INET6, &(tmpaddr6.sin6_addr), (char *)&tmpip6, sizeof(tmpip6)); | |
798 | if (!string_is_ip_address(US tmpip6,NULL)) | |
799 | { | |
800 | DEBUG(D_receive) debug_printf("Invalid %s dest port\n", iptype); | |
a3c86431 | 801 | return ERRNO_PROXYFAIL; |
eb57651e TL |
802 | } |
803 | proxy_target_address = string_copy(US tmpip6); | |
804 | tmpport = ntohs(hdr.v2.addr.ip6.dst_port); | |
805 | proxy_target_port = tmpport; | |
a3c86431 | 806 | goto done; |
eb57651e TL |
807 | default: |
808 | DEBUG(D_receive) | |
809 | debug_printf("Unsupported PROXYv2 connection type: 0x%02x\n", | |
810 | hdr.v2.fam); | |
811 | goto proxyfail; | |
a3c86431 TL |
812 | } |
813 | /* Unsupported protocol, keep local connection address */ | |
814 | break; | |
815 | case 0x00: /* LOCAL command */ | |
816 | /* Keep local connection address for LOCAL */ | |
817 | break; | |
818 | default: | |
eb57651e | 819 | DEBUG(D_receive) |
36719342 | 820 | debug_printf("Unsupported PROXYv2 command: 0x%x\n", cmd); |
a3c86431 TL |
821 | goto proxyfail; |
822 | } | |
823 | } | |
824 | else if (ret >= 8 && | |
825 | memcmp(hdr.v1.line, "PROXY", 5) == 0) | |
826 | { | |
827 | uschar *p = string_copy(hdr.v1.line); | |
828 | uschar *end = memchr(p, '\r', ret - 1); | |
829 | uschar *sp; /* Utility variables follow */ | |
830 | int tmp_port; | |
831 | char *endc; | |
832 | ||
833 | if (!end || end[1] != '\n') | |
834 | { | |
835 | DEBUG(D_receive) debug_printf("Partial or invalid PROXY header\n"); | |
836 | goto proxyfail; | |
837 | } | |
838 | *end = '\0'; /* Terminate the string */ | |
839 | size = end + 2 - hdr.v1.line; /* Skip header + CRLF */ | |
840 | DEBUG(D_receive) debug_printf("Detected PROXYv1 header\n"); | |
841 | /* Step through the string looking for the required fields. Ensure | |
842 | strict adherance to required formatting, exit for any error. */ | |
843 | p += 5; | |
844 | if (!isspace(*(p++))) | |
845 | { | |
846 | DEBUG(D_receive) debug_printf("Missing space after PROXY command\n"); | |
847 | goto proxyfail; | |
848 | } | |
849 | if (!Ustrncmp(p, CCS"TCP4", 4)) | |
850 | iptype = US"IPv4"; | |
851 | else if (!Ustrncmp(p,CCS"TCP6", 4)) | |
852 | iptype = US"IPv6"; | |
853 | else if (!Ustrncmp(p,CCS"UNKNOWN", 7)) | |
854 | { | |
855 | iptype = US"Unknown"; | |
856 | goto done; | |
857 | } | |
858 | else | |
859 | { | |
860 | DEBUG(D_receive) debug_printf("Invalid TCP type\n"); | |
861 | goto proxyfail; | |
862 | } | |
863 | ||
864 | p += Ustrlen(iptype); | |
865 | if (!isspace(*(p++))) | |
866 | { | |
867 | DEBUG(D_receive) debug_printf("Missing space after TCP4/6 command\n"); | |
868 | goto proxyfail; | |
869 | } | |
870 | /* Find the end of the arg */ | |
871 | if ((sp = Ustrchr(p, ' ')) == NULL) | |
872 | { | |
873 | DEBUG(D_receive) | |
874 | debug_printf("Did not find proxied src %s\n", iptype); | |
875 | goto proxyfail; | |
876 | } | |
877 | *sp = '\0'; | |
878 | if(!string_is_ip_address(p,NULL)) | |
879 | { | |
880 | DEBUG(D_receive) | |
881 | debug_printf("Proxied src arg is not an %s address\n", iptype); | |
882 | goto proxyfail; | |
883 | } | |
a3bddaa8 | 884 | proxy_host_address = sender_host_address; |
a3c86431 TL |
885 | sender_host_address = p; |
886 | p = sp + 1; | |
887 | if ((sp = Ustrchr(p, ' ')) == NULL) | |
888 | { | |
889 | DEBUG(D_receive) | |
890 | debug_printf("Did not find proxy dest %s\n", iptype); | |
891 | goto proxyfail; | |
892 | } | |
893 | *sp = '\0'; | |
894 | if(!string_is_ip_address(p,NULL)) | |
895 | { | |
896 | DEBUG(D_receive) | |
897 | debug_printf("Proxy dest arg is not an %s address\n", iptype); | |
898 | goto proxyfail; | |
899 | } | |
eb57651e | 900 | proxy_target_address = p; |
a3c86431 TL |
901 | p = sp + 1; |
902 | if ((sp = Ustrchr(p, ' ')) == NULL) | |
903 | { | |
904 | DEBUG(D_receive) debug_printf("Did not find proxied src port\n"); | |
905 | goto proxyfail; | |
906 | } | |
907 | *sp = '\0'; | |
908 | tmp_port = strtol(CCS p,&endc,10); | |
909 | if (*endc || tmp_port == 0) | |
910 | { | |
911 | DEBUG(D_receive) | |
912 | debug_printf("Proxied src port '%s' not an integer\n", p); | |
913 | goto proxyfail; | |
914 | } | |
a3bddaa8 | 915 | proxy_host_port = sender_host_port; |
a3c86431 TL |
916 | sender_host_port = tmp_port; |
917 | p = sp + 1; | |
918 | if ((sp = Ustrchr(p, '\0')) == NULL) | |
919 | { | |
920 | DEBUG(D_receive) debug_printf("Did not find proxy dest port\n"); | |
921 | goto proxyfail; | |
922 | } | |
923 | tmp_port = strtol(CCS p,&endc,10); | |
924 | if (*endc || tmp_port == 0) | |
925 | { | |
926 | DEBUG(D_receive) | |
927 | debug_printf("Proxy dest port '%s' not an integer\n", p); | |
928 | goto proxyfail; | |
929 | } | |
eb57651e | 930 | proxy_target_port = tmp_port; |
a3c86431 TL |
931 | /* Already checked for /r /n above. Good V1 header received. */ |
932 | goto done; | |
933 | } | |
934 | else | |
935 | { | |
936 | /* Wrong protocol */ | |
eb57651e | 937 | DEBUG(D_receive) debug_printf("Invalid proxy protocol version negotiation\n"); |
a3c86431 TL |
938 | goto proxyfail; |
939 | } | |
940 | ||
941 | proxyfail: | |
a3bddaa8 | 942 | restore_socket_timeout(fd, get_ok, tvtmp, vslen); |
a3c86431 | 943 | /* Don't flush any potential buffer contents. Any input should cause a |
eb57651e | 944 | synchronization failure */ |
a3c86431 TL |
945 | return FALSE; |
946 | ||
947 | done: | |
a3bddaa8 | 948 | restore_socket_timeout(fd, get_ok, tvtmp, vslen); |
a3c86431 | 949 | DEBUG(D_receive) |
eb57651e | 950 | debug_printf("Valid %s sender from Proxy Protocol header\n", iptype); |
a3c86431 TL |
951 | return proxy_session; |
952 | } | |
953 | #endif | |
954 | ||
059ec3d9 PH |
955 | /************************************************* |
956 | * Read one command line * | |
957 | *************************************************/ | |
958 | ||
959 | /* Strictly, SMTP commands coming over the net are supposed to end with CRLF. | |
960 | There are sites that don't do this, and in any case internal SMTP probably | |
961 | should check only for LF. Consequently, we check here for LF only. The line | |
962 | ends up with [CR]LF removed from its end. If we get an overlong line, treat as | |
3ee512ff PH |
963 | an unknown command. The command is read into the global smtp_cmd_buffer so that |
964 | it is available via $smtp_command. | |
059ec3d9 PH |
965 | |
966 | The character reading routine sets up a timeout for each block actually read | |
967 | from the input (which may contain more than one command). We set up a special | |
968 | signal handler that closes down the session on a timeout. Control does not | |
969 | return when it runs. | |
970 | ||
971 | Arguments: | |
972 | check_sync if TRUE, check synchronization rules if global option is TRUE | |
973 | ||
974 | Returns: a code identifying the command (enumerated above) | |
975 | */ | |
976 | ||
977 | static int | |
978 | smtp_read_command(BOOL check_sync) | |
979 | { | |
980 | int c; | |
981 | int ptr = 0; | |
982 | smtp_cmd_list *p; | |
983 | BOOL hadnull = FALSE; | |
984 | ||
985 | os_non_restarting_signal(SIGALRM, command_timeout_handler); | |
986 | ||
987 | while ((c = (receive_getc)()) != '\n' && c != EOF) | |
988 | { | |
3ee512ff | 989 | if (ptr >= smtp_cmd_buffer_size) |
059ec3d9 PH |
990 | { |
991 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
992 | return OTHER_CMD; | |
993 | } | |
994 | if (c == 0) | |
995 | { | |
996 | hadnull = TRUE; | |
997 | c = '?'; | |
998 | } | |
3ee512ff | 999 | smtp_cmd_buffer[ptr++] = c; |
059ec3d9 PH |
1000 | } |
1001 | ||
1002 | receive_linecount++; /* For BSMTP errors */ | |
1003 | os_non_restarting_signal(SIGALRM, sigalrm_handler); | |
1004 | ||
1005 | /* If hit end of file, return pseudo EOF command. Whether we have a | |
1006 | part-line already read doesn't matter, since this is an error state. */ | |
1007 | ||
1008 | if (c == EOF) return EOF_CMD; | |
1009 | ||
1010 | /* Remove any CR and white space at the end of the line, and terminate the | |
1011 | string. */ | |
1012 | ||
3ee512ff PH |
1013 | while (ptr > 0 && isspace(smtp_cmd_buffer[ptr-1])) ptr--; |
1014 | smtp_cmd_buffer[ptr] = 0; | |
059ec3d9 | 1015 | |
3ee512ff | 1016 | DEBUG(D_receive) debug_printf("SMTP<< %s\n", smtp_cmd_buffer); |
059ec3d9 PH |
1017 | |
1018 | /* NULLs are not allowed in SMTP commands */ | |
1019 | ||
1020 | if (hadnull) return BADCHAR_CMD; | |
1021 | ||
1022 | /* Scan command list and return identity, having set the data pointer | |
1023 | to the start of the actual data characters. Check for SMTP synchronization | |
1024 | if required. */ | |
1025 | ||
1026 | for (p = cmd_list; p < cmd_list_end; p++) | |
1027 | { | |
a3c86431 TL |
1028 | #ifdef EXPERIMENTAL_PROXY |
1029 | /* Only allow QUIT command if Proxy Protocol parsing failed */ | |
1030 | if (proxy_session && proxy_session_failed) | |
1031 | { | |
1032 | if (p->cmd != QUIT_CMD) | |
1033 | continue; | |
1034 | } | |
1035 | #endif | |
2f460950 JH |
1036 | if ( p->len |
1037 | && strncmpic(smtp_cmd_buffer, US p->name, p->len) == 0 | |
1038 | && ( smtp_cmd_buffer[p->len-1] == ':' /* "mail from:" or "rcpt to:" */ | |
1039 | || smtp_cmd_buffer[p->len] == 0 | |
1040 | || smtp_cmd_buffer[p->len] == ' ' | |
1041 | ) ) | |
059ec3d9 PH |
1042 | { |
1043 | if (smtp_inptr < smtp_inend && /* Outstanding input */ | |
1044 | p->cmd < sync_cmd_limit && /* Command should sync */ | |
1045 | check_sync && /* Local flag set */ | |
1046 | smtp_enforce_sync && /* Global flag set */ | |
1047 | sender_host_address != NULL && /* Not local input */ | |
1048 | !sender_host_notsocket) /* Really is a socket */ | |
1049 | return BADSYN_CMD; | |
1050 | ||
ca86f471 PH |
1051 | /* The variables $smtp_command and $smtp_command_argument point into the |
1052 | unmodified input buffer. A copy of the latter is taken for actual | |
1053 | processing, so that it can be chopped up into separate parts if necessary, | |
1054 | for example, when processing a MAIL command options such as SIZE that can | |
1055 | follow the sender address. */ | |
059ec3d9 | 1056 | |
3ee512ff | 1057 | smtp_cmd_argument = smtp_cmd_buffer + p->len; |
ca86f471 PH |
1058 | while (isspace(*smtp_cmd_argument)) smtp_cmd_argument++; |
1059 | Ustrcpy(smtp_data_buffer, smtp_cmd_argument); | |
1060 | smtp_cmd_data = smtp_data_buffer; | |
059ec3d9 PH |
1061 | |
1062 | /* Count non-mail commands from those hosts that are controlled in this | |
1063 | way. The default is all hosts. We don't waste effort checking the list | |
1064 | until we get a non-mail command, but then cache the result to save checking | |
1065 | again. If there's a DEFER while checking the host, assume it's in the list. | |
1066 | ||
1067 | Note that one instance of RSET, EHLO/HELO, and STARTTLS is allowed at the | |
1068 | start of each incoming message by fiddling with the value in the table. */ | |
1069 | ||
1070 | if (!p->is_mail_cmd) | |
1071 | { | |
1072 | if (count_nonmail == TRUE_UNSET) count_nonmail = | |
1073 | verify_check_host(&smtp_accept_max_nonmail_hosts) != FAIL; | |
1074 | if (count_nonmail && ++nonmail_command_count > smtp_accept_max_nonmail) | |
1075 | return TOO_MANY_NONMAIL_CMD; | |
1076 | } | |
1077 | ||
ca86f471 PH |
1078 | /* If there is data for a command that does not expect it, generate the |
1079 | error here. */ | |
059ec3d9 | 1080 | |
ca86f471 | 1081 | return (p->has_arg || *smtp_cmd_data == 0)? p->cmd : BADARG_CMD; |
059ec3d9 PH |
1082 | } |
1083 | } | |
1084 | ||
a3c86431 TL |
1085 | #ifdef EXPERIMENTAL_PROXY |
1086 | /* Only allow QUIT command if Proxy Protocol parsing failed */ | |
1087 | if (proxy_session && proxy_session_failed) | |
1088 | return PROXY_FAIL_IGNORE_CMD; | |
1089 | #endif | |
1090 | ||
059ec3d9 PH |
1091 | /* Enforce synchronization for unknown commands */ |
1092 | ||
1093 | if (smtp_inptr < smtp_inend && /* Outstanding input */ | |
1094 | check_sync && /* Local flag set */ | |
1095 | smtp_enforce_sync && /* Global flag set */ | |
1096 | sender_host_address != NULL && /* Not local input */ | |
1097 | !sender_host_notsocket) /* Really is a socket */ | |
1098 | return BADSYN_CMD; | |
1099 | ||
1100 | return OTHER_CMD; | |
1101 | } | |
1102 | ||
1103 | ||
1104 | ||
a14e5636 PH |
1105 | /************************************************* |
1106 | * Recheck synchronization * | |
1107 | *************************************************/ | |
1108 | ||
1109 | /* Synchronization checks can never be perfect because a packet may be on its | |
1110 | way but not arrived when the check is done. Such checks can in any case only be | |
1111 | done when TLS is not in use. Normally, the checks happen when commands are | |
1112 | read: Exim ensures that there is no more input in the input buffer. In normal | |
1113 | cases, the response to the command will be fast, and there is no further check. | |
1114 | ||
1115 | However, for some commands an ACL is run, and that can include delays. In those | |
1116 | cases, it is useful to do another check on the input just before sending the | |
1117 | response. This also applies at the start of a connection. This function does | |
1118 | that check by means of the select() function, as long as the facility is not | |
1119 | disabled or inappropriate. A failure of select() is ignored. | |
1120 | ||
1121 | When there is unwanted input, we read it so that it appears in the log of the | |
1122 | error. | |
1123 | ||
1124 | Arguments: none | |
1125 | Returns: TRUE if all is well; FALSE if there is input pending | |
1126 | */ | |
1127 | ||
1128 | static BOOL | |
1129 | check_sync(void) | |
1130 | { | |
1131 | int fd, rc; | |
1132 | fd_set fds; | |
1133 | struct timeval tzero; | |
1134 | ||
1135 | if (!smtp_enforce_sync || sender_host_address == NULL || | |
817d9f57 | 1136 | sender_host_notsocket || tls_in.active >= 0) |
a14e5636 PH |
1137 | return TRUE; |
1138 | ||
1139 | fd = fileno(smtp_in); | |
1140 | FD_ZERO(&fds); | |
1141 | FD_SET(fd, &fds); | |
1142 | tzero.tv_sec = 0; | |
1143 | tzero.tv_usec = 0; | |
1144 | rc = select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tzero); | |
1145 | ||
1146 | if (rc <= 0) return TRUE; /* Not ready to read */ | |
1147 | rc = smtp_getc(); | |
1148 | if (rc < 0) return TRUE; /* End of file or error */ | |
1149 | ||
1150 | smtp_ungetc(rc); | |
1151 | rc = smtp_inend - smtp_inptr; | |
1152 | if (rc > 150) rc = 150; | |
1153 | smtp_inptr[rc] = 0; | |
1154 | return FALSE; | |
1155 | } | |
1156 | ||
1157 | ||
1158 | ||
059ec3d9 PH |
1159 | /************************************************* |
1160 | * Forced closedown of call * | |
1161 | *************************************************/ | |
1162 | ||
1163 | /* This function is called from log.c when Exim is dying because of a serious | |
1164 | disaster, and also from some other places. If an incoming non-batched SMTP | |
1165 | channel is open, it swallows the rest of the incoming message if in the DATA | |
1166 | phase, sends the reply string, and gives an error to all subsequent commands | |
1167 | except QUIT. The existence of an SMTP call is detected by the non-NULLness of | |
1168 | smtp_in. | |
1169 | ||
8f128379 PH |
1170 | Arguments: |
1171 | message SMTP reply string to send, excluding the code | |
1172 | ||
059ec3d9 PH |
1173 | Returns: nothing |
1174 | */ | |
1175 | ||
1176 | void | |
1177 | smtp_closedown(uschar *message) | |
1178 | { | |
1179 | if (smtp_in == NULL || smtp_batched_input) return; | |
1180 | receive_swallow_smtp(); | |
1181 | smtp_printf("421 %s\r\n", message); | |
1182 | ||
1183 | for (;;) | |
1184 | { | |
1185 | switch(smtp_read_command(FALSE)) | |
1186 | { | |
1187 | case EOF_CMD: | |
1188 | return; | |
1189 | ||
1190 | case QUIT_CMD: | |
1191 | smtp_printf("221 %s closing connection\r\n", smtp_active_hostname); | |
1192 | mac_smtp_fflush(); | |
1193 | return; | |
1194 | ||
1195 | case RSET_CMD: | |
1196 | smtp_printf("250 Reset OK\r\n"); | |
1197 | break; | |
1198 | ||
1199 | default: | |
1200 | smtp_printf("421 %s\r\n", message); | |
1201 | break; | |
1202 | } | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | ||
1207 | ||
1208 | ||
1209 | /************************************************* | |
1210 | * Set up connection info for logging * | |
1211 | *************************************************/ | |
1212 | ||
1213 | /* This function is called when logging information about an SMTP connection. | |
1214 | It sets up appropriate source information, depending on the type of connection. | |
dac79d3e PH |
1215 | If sender_fullhost is NULL, we are at a very early stage of the connection; |
1216 | just use the IP address. | |
059ec3d9 PH |
1217 | |
1218 | Argument: none | |
1219 | Returns: a string describing the connection | |
1220 | */ | |
1221 | ||
1222 | uschar * | |
1223 | smtp_get_connection_info(void) | |
1224 | { | |
dac79d3e PH |
1225 | uschar *hostname = (sender_fullhost == NULL)? |
1226 | sender_host_address : sender_fullhost; | |
1227 | ||
059ec3d9 | 1228 | if (host_checking) |
dac79d3e | 1229 | return string_sprintf("SMTP connection from %s", hostname); |
059ec3d9 PH |
1230 | |
1231 | if (sender_host_unknown || sender_host_notsocket) | |
1232 | return string_sprintf("SMTP connection from %s", sender_ident); | |
1233 | ||
1234 | if (is_inetd) | |
dac79d3e | 1235 | return string_sprintf("SMTP connection from %s (via inetd)", hostname); |
059ec3d9 PH |
1236 | |
1237 | if ((log_extra_selector & LX_incoming_interface) != 0 && | |
1238 | interface_address != NULL) | |
dac79d3e | 1239 | return string_sprintf("SMTP connection from %s I=[%s]:%d", hostname, |
059ec3d9 PH |
1240 | interface_address, interface_port); |
1241 | ||
dac79d3e | 1242 | return string_sprintf("SMTP connection from %s", hostname); |
059ec3d9 PH |
1243 | } |
1244 | ||
1245 | ||
1246 | ||
e45a1c37 | 1247 | #ifdef SUPPORT_TLS |
887291d2 JH |
1248 | /* Append TLS-related information to a log line |
1249 | ||
1250 | Arguments: | |
1251 | s String under construction: allocated string to extend, or NULL | |
1252 | sizep Pointer to current allocation size (update on return), or NULL | |
1253 | ptrp Pointer to index for new entries in string (update on return), or NULL | |
1254 | ||
1255 | Returns: Allocated string or NULL | |
1256 | */ | |
e45a1c37 JH |
1257 | static uschar * |
1258 | s_tlslog(uschar * s, int * sizep, int * ptrp) | |
1259 | { | |
1260 | int size = sizep ? *sizep : 0; | |
1261 | int ptr = ptrp ? *ptrp : 0; | |
1262 | ||
1263 | if ((log_extra_selector & LX_tls_cipher) != 0 && tls_in.cipher != NULL) | |
1264 | s = string_append(s, &size, &ptr, 2, US" X=", tls_in.cipher); | |
1265 | if ((log_extra_selector & LX_tls_certificate_verified) != 0 && | |
1266 | tls_in.cipher != NULL) | |
1267 | s = string_append(s, &size, &ptr, 2, US" CV=", | |
1268 | tls_in.certificate_verified? "yes":"no"); | |
1269 | if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_in.peerdn != NULL) | |
1270 | s = string_append(s, &size, &ptr, 3, US" DN=\"", | |
1271 | string_printing(tls_in.peerdn), US"\""); | |
1272 | if ((log_extra_selector & LX_tls_sni) != 0 && tls_in.sni != NULL) | |
1273 | s = string_append(s, &size, &ptr, 3, US" SNI=\"", | |
1274 | string_printing(tls_in.sni), US"\""); | |
1275 | ||
67d81c10 JH |
1276 | if (s) |
1277 | { | |
1278 | s[ptr] = '\0'; | |
1279 | if (sizep) *sizep = size; | |
1280 | if (ptrp) *ptrp = ptr; | |
1281 | } | |
e45a1c37 JH |
1282 | return s; |
1283 | } | |
1284 | #endif | |
1285 | ||
b4ed4da0 PH |
1286 | /************************************************* |
1287 | * Log lack of MAIL if so configured * | |
1288 | *************************************************/ | |
1289 | ||
1290 | /* This function is called when an SMTP session ends. If the log selector | |
1291 | smtp_no_mail is set, write a log line giving some details of what has happened | |
1292 | in the SMTP session. | |
1293 | ||
1294 | Arguments: none | |
1295 | Returns: nothing | |
1296 | */ | |
1297 | ||
1298 | void | |
1299 | smtp_log_no_mail(void) | |
1300 | { | |
1301 | int size, ptr, i; | |
1302 | uschar *s, *sep; | |
1303 | ||
1304 | if (smtp_mailcmd_count > 0 || (log_extra_selector & LX_smtp_no_mail) == 0) | |
1305 | return; | |
1306 | ||
1307 | s = NULL; | |
1308 | size = ptr = 0; | |
1309 | ||
1310 | if (sender_host_authenticated != NULL) | |
1311 | { | |
1312 | s = string_append(s, &size, &ptr, 2, US" A=", sender_host_authenticated); | |
1313 | if (authenticated_id != NULL) | |
1314 | s = string_append(s, &size, &ptr, 2, US":", authenticated_id); | |
1315 | } | |
1316 | ||
1317 | #ifdef SUPPORT_TLS | |
e45a1c37 | 1318 | s = s_tlslog(s, &size, &ptr); |
3f0945ff | 1319 | #endif |
b4ed4da0 PH |
1320 | |
1321 | sep = (smtp_connection_had[SMTP_HBUFF_SIZE-1] != SCH_NONE)? | |
1322 | US" C=..." : US" C="; | |
1323 | for (i = smtp_ch_index; i < SMTP_HBUFF_SIZE; i++) | |
1324 | { | |
1325 | if (smtp_connection_had[i] != SCH_NONE) | |
1326 | { | |
1327 | s = string_append(s, &size, &ptr, 2, sep, | |
1328 | smtp_names[smtp_connection_had[i]]); | |
1329 | sep = US","; | |
1330 | } | |
1331 | } | |
1332 | ||
1333 | for (i = 0; i < smtp_ch_index; i++) | |
1334 | { | |
1335 | s = string_append(s, &size, &ptr, 2, sep, smtp_names[smtp_connection_had[i]]); | |
1336 | sep = US","; | |
1337 | } | |
1338 | ||
1339 | if (s != NULL) s[ptr] = 0; else s = US""; | |
1340 | log_write(0, LOG_MAIN, "no MAIL in SMTP connection from %s D=%s%s", | |
1341 | host_and_ident(FALSE), | |
19050083 JH |
1342 | readconf_printtime( (int) ((long)time(NULL) - (long)smtp_connection_start)), |
1343 | s); | |
b4ed4da0 PH |
1344 | } |
1345 | ||
1346 | ||
1347 | ||
059ec3d9 PH |
1348 | /************************************************* |
1349 | * Check HELO line and set sender_helo_name * | |
1350 | *************************************************/ | |
1351 | ||
1352 | /* Check the format of a HELO line. The data for HELO/EHLO is supposed to be | |
1353 | the domain name of the sending host, or an ip literal in square brackets. The | |
1354 | arrgument is placed in sender_helo_name, which is in malloc store, because it | |
1355 | must persist over multiple incoming messages. If helo_accept_junk is set, this | |
1356 | host is permitted to send any old junk (needed for some broken hosts). | |
1357 | Otherwise, helo_allow_chars can be used for rogue characters in general | |
1358 | (typically people want to let in underscores). | |
1359 | ||
1360 | Argument: | |
1361 | s the data portion of the line (already past any white space) | |
1362 | ||
1363 | Returns: TRUE or FALSE | |
1364 | */ | |
1365 | ||
1366 | static BOOL | |
1367 | check_helo(uschar *s) | |
1368 | { | |
1369 | uschar *start = s; | |
1370 | uschar *end = s + Ustrlen(s); | |
1371 | BOOL yield = helo_accept_junk; | |
1372 | ||
1373 | /* Discard any previous helo name */ | |
1374 | ||
1375 | if (sender_helo_name != NULL) | |
1376 | { | |
1377 | store_free(sender_helo_name); | |
1378 | sender_helo_name = NULL; | |
1379 | } | |
1380 | ||
1381 | /* Skip tests if junk is permitted. */ | |
1382 | ||
1383 | if (!yield) | |
1384 | { | |
1385 | /* Allow the new standard form for IPv6 address literals, namely, | |
1386 | [IPv6:....], and because someone is bound to use it, allow an equivalent | |
1387 | IPv4 form. Allow plain addresses as well. */ | |
1388 | ||
1389 | if (*s == '[') | |
1390 | { | |
1391 | if (end[-1] == ']') | |
1392 | { | |
1393 | end[-1] = 0; | |
1394 | if (strncmpic(s, US"[IPv6:", 6) == 0) | |
1395 | yield = (string_is_ip_address(s+6, NULL) == 6); | |
1396 | else if (strncmpic(s, US"[IPv4:", 6) == 0) | |
1397 | yield = (string_is_ip_address(s+6, NULL) == 4); | |
1398 | else | |
1399 | yield = (string_is_ip_address(s+1, NULL) != 0); | |
1400 | end[-1] = ']'; | |
1401 | } | |
1402 | } | |
1403 | ||
1404 | /* Non-literals must be alpha, dot, hyphen, plus any non-valid chars | |
1405 | that have been configured (usually underscore - sigh). */ | |
1406 | ||
1407 | else if (*s != 0) | |
1408 | { | |
1409 | yield = TRUE; | |
1410 | while (*s != 0) | |
1411 | { | |
1412 | if (!isalnum(*s) && *s != '.' && *s != '-' && | |
1413 | Ustrchr(helo_allow_chars, *s) == NULL) | |
1414 | { | |
1415 | yield = FALSE; | |
1416 | break; | |
1417 | } | |
1418 | s++; | |
1419 | } | |
1420 | } | |
1421 | } | |
1422 | ||
1423 | /* Save argument if OK */ | |
1424 | ||
1425 | if (yield) sender_helo_name = string_copy_malloc(start); | |
1426 | return yield; | |
1427 | } | |
1428 | ||
1429 | ||
1430 | ||
1431 | ||
1432 | ||
1433 | /************************************************* | |
1434 | * Extract SMTP command option * | |
1435 | *************************************************/ | |
1436 | ||
ca86f471 | 1437 | /* This function picks the next option setting off the end of smtp_cmd_data. It |
059ec3d9 PH |
1438 | is called for MAIL FROM and RCPT TO commands, to pick off the optional ESMTP |
1439 | things that can appear there. | |
1440 | ||
1441 | Arguments: | |
1442 | name point this at the name | |
1443 | value point this at the data string | |
1444 | ||
1445 | Returns: TRUE if found an option | |
1446 | */ | |
1447 | ||
1448 | static BOOL | |
1449 | extract_option(uschar **name, uschar **value) | |
1450 | { | |
1451 | uschar *n; | |
ca86f471 | 1452 | uschar *v = smtp_cmd_data + Ustrlen(smtp_cmd_data) - 1; |
059ec3d9 PH |
1453 | while (isspace(*v)) v--; |
1454 | v[1] = 0; | |
ca86f471 | 1455 | while (v > smtp_cmd_data && *v != '=' && !isspace(*v)) v--; |
059ec3d9 PH |
1456 | |
1457 | n = v; | |
fd98a5c6 JH |
1458 | if (*v == '=') |
1459 | { | |
1460 | while(isalpha(n[-1])) n--; | |
1461 | /* RFC says SP, but TAB seen in wild and other major MTAs accept it */ | |
1462 | if (!isspace(n[-1])) return FALSE; | |
1463 | n[-1] = 0; | |
1464 | } | |
1465 | else | |
1466 | { | |
1467 | n++; | |
1468 | if (v == smtp_cmd_data) return FALSE; | |
1469 | } | |
059ec3d9 | 1470 | *v++ = 0; |
fd98a5c6 | 1471 | *name = n; |
059ec3d9 PH |
1472 | *value = v; |
1473 | return TRUE; | |
1474 | } | |
1475 | ||
1476 | ||
1477 | ||
1478 | ||
1479 | ||
059ec3d9 PH |
1480 | /************************************************* |
1481 | * Reset for new message * | |
1482 | *************************************************/ | |
1483 | ||
1484 | /* This function is called whenever the SMTP session is reset from | |
1485 | within either of the setup functions. | |
1486 | ||
1487 | Argument: the stacking pool storage reset point | |
1488 | Returns: nothing | |
1489 | */ | |
1490 | ||
1491 | static void | |
1492 | smtp_reset(void *reset_point) | |
1493 | { | |
059ec3d9 PH |
1494 | store_reset(reset_point); |
1495 | recipients_list = NULL; | |
1496 | rcpt_count = rcpt_defer_count = rcpt_fail_count = | |
1497 | raw_recipients_count = recipients_count = recipients_list_max = 0; | |
2e5b33cd | 1498 | cancel_cutthrough_connection("smtp reset"); |
2e0c1448 | 1499 | message_linecount = 0; |
059ec3d9 | 1500 | message_size = -1; |
71fafd95 | 1501 | acl_added_headers = NULL; |
e7568d51 | 1502 | acl_removed_headers = NULL; |
059ec3d9 | 1503 | queue_only_policy = FALSE; |
2679d413 PH |
1504 | rcpt_smtp_response = NULL; |
1505 | rcpt_smtp_response_same = TRUE; | |
1506 | rcpt_in_progress = FALSE; | |
69358f02 | 1507 | deliver_freeze = FALSE; /* Can be set by ACL */ |
6a3f1455 | 1508 | freeze_tell = freeze_tell_config; /* Can be set by ACL */ |
29aba418 | 1509 | fake_response = OK; /* Can be set by ACL */ |
6951ac6c | 1510 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
1511 | no_mbox_unspool = FALSE; /* Can be set by ACL */ |
1512 | #endif | |
69358f02 | 1513 | submission_mode = FALSE; /* Can be set by ACL */ |
f4ee74ac | 1514 | suppress_local_fixups = suppress_local_fixups_default; /* Can be set by ACL */ |
69358f02 PH |
1515 | active_local_from_check = local_from_check; /* Can be set by ACL */ |
1516 | active_local_sender_retain = local_sender_retain; /* Can be set by ACL */ | |
059ec3d9 | 1517 | sender_address = NULL; |
2fe1a124 | 1518 | submission_name = NULL; /* Can be set by ACL */ |
059ec3d9 PH |
1519 | raw_sender = NULL; /* After SMTP rewrite, before qualifying */ |
1520 | sender_address_unrewritten = NULL; /* Set only after verify rewrite */ | |
1521 | sender_verified_list = NULL; /* No senders verified */ | |
1522 | memset(sender_address_cache, 0, sizeof(sender_address_cache)); | |
1523 | memset(sender_domain_cache, 0, sizeof(sender_domain_cache)); | |
6c1c3d1d | 1524 | |
a2b89db1 | 1525 | #ifndef DISABLE_PRDR |
d1a13eea | 1526 | prdr_requested = FALSE; |
a2b89db1 | 1527 | #endif |
d1a13eea | 1528 | |
6c1c3d1d WB |
1529 | /* Reset the DSN flags */ |
1530 | dsn_ret = 0; | |
1531 | dsn_envid = NULL; | |
6c1c3d1d | 1532 | |
059ec3d9 | 1533 | authenticated_sender = NULL; |
8523533c TK |
1534 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
1535 | bmi_run = 0; | |
1536 | bmi_verdicts = NULL; | |
1537 | #endif | |
80a47a2c | 1538 | #ifndef DISABLE_DKIM |
9e5d6b55 | 1539 | dkim_signers = NULL; |
80a47a2c TK |
1540 | dkim_disable_verify = FALSE; |
1541 | dkim_collect_input = FALSE; | |
f7572e5a | 1542 | #endif |
8523533c TK |
1543 | #ifdef EXPERIMENTAL_SPF |
1544 | spf_header_comment = NULL; | |
1545 | spf_received = NULL; | |
8e669ac1 | 1546 | spf_result = NULL; |
8523533c TK |
1547 | spf_smtp_comment = NULL; |
1548 | #endif | |
d1a13eea JH |
1549 | #ifdef EXPERIMENTAL_INTERNATIONAL |
1550 | message_smtputf8 = FALSE; | |
1551 | #endif | |
059ec3d9 PH |
1552 | body_linecount = body_zerocount = 0; |
1553 | ||
870f6ba8 TF |
1554 | sender_rate = sender_rate_limit = sender_rate_period = NULL; |
1555 | ratelimiters_mail = NULL; /* Updated by ratelimit ACL condition */ | |
1556 | /* Note that ratelimiters_conn persists across resets. */ | |
1557 | ||
38a0a95f | 1558 | /* Reset message ACL variables */ |
47ca6d6c | 1559 | |
38a0a95f | 1560 | acl_var_m = NULL; |
059ec3d9 PH |
1561 | |
1562 | /* The message body variables use malloc store. They may be set if this is | |
1563 | not the first message in an SMTP session and the previous message caused them | |
1564 | to be referenced in an ACL. */ | |
1565 | ||
1566 | if (message_body != NULL) | |
1567 | { | |
1568 | store_free(message_body); | |
1569 | message_body = NULL; | |
1570 | } | |
1571 | ||
1572 | if (message_body_end != NULL) | |
1573 | { | |
1574 | store_free(message_body_end); | |
1575 | message_body_end = NULL; | |
1576 | } | |
1577 | ||
1578 | /* Warning log messages are also saved in malloc store. They are saved to avoid | |
1579 | repetition in the same message, but it seems right to repeat them for different | |
4e88a19f | 1580 | messages. */ |
059ec3d9 PH |
1581 | |
1582 | while (acl_warn_logged != NULL) | |
1583 | { | |
1584 | string_item *this = acl_warn_logged; | |
1585 | acl_warn_logged = acl_warn_logged->next; | |
1586 | store_free(this); | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | ||
1591 | ||
1592 | ||
1593 | ||
1594 | /************************************************* | |
1595 | * Initialize for incoming batched SMTP message * | |
1596 | *************************************************/ | |
1597 | ||
1598 | /* This function is called from smtp_setup_msg() in the case when | |
1599 | smtp_batched_input is true. This happens when -bS is used to pass a whole batch | |
1600 | of messages in one file with SMTP commands between them. All errors must be | |
1601 | reported by sending a message, and only MAIL FROM, RCPT TO, and DATA are | |
1602 | relevant. After an error on a sender, or an invalid recipient, the remainder | |
1603 | of the message is skipped. The value of received_protocol is already set. | |
1604 | ||
1605 | Argument: none | |
1606 | Returns: > 0 message successfully started (reached DATA) | |
1607 | = 0 QUIT read or end of file reached | |
1608 | < 0 should not occur | |
1609 | */ | |
1610 | ||
1611 | static int | |
1612 | smtp_setup_batch_msg(void) | |
1613 | { | |
1614 | int done = 0; | |
1615 | void *reset_point = store_get(0); | |
1616 | ||
1617 | /* Save the line count at the start of each transaction - single commands | |
1618 | like HELO and RSET count as whole transactions. */ | |
1619 | ||
1620 | bsmtp_transaction_linecount = receive_linecount; | |
1621 | ||
1622 | if ((receive_feof)()) return 0; /* Treat EOF as QUIT */ | |
1623 | ||
1624 | smtp_reset(reset_point); /* Reset for start of message */ | |
1625 | ||
1626 | /* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE | |
1627 | value. The values are 2 larger than the required yield of the function. */ | |
1628 | ||
1629 | while (done <= 0) | |
1630 | { | |
1631 | uschar *errmess; | |
1632 | uschar *recipient = NULL; | |
1633 | int start, end, sender_domain, recipient_domain; | |
1634 | ||
1635 | switch(smtp_read_command(FALSE)) | |
1636 | { | |
1637 | /* The HELO/EHLO commands set sender_address_helo if they have | |
1638 | valid data; otherwise they are ignored, except that they do | |
1639 | a reset of the state. */ | |
1640 | ||
1641 | case HELO_CMD: | |
1642 | case EHLO_CMD: | |
1643 | ||
ca86f471 | 1644 | check_helo(smtp_cmd_data); |
059ec3d9 PH |
1645 | /* Fall through */ |
1646 | ||
1647 | case RSET_CMD: | |
1648 | smtp_reset(reset_point); | |
1649 | bsmtp_transaction_linecount = receive_linecount; | |
1650 | break; | |
1651 | ||
1652 | ||
1653 | /* The MAIL FROM command requires an address as an operand. All we | |
1654 | do here is to parse it for syntactic correctness. The form "<>" is | |
1655 | a special case which converts into an empty string. The start/end | |
1656 | pointers in the original are not used further for this address, as | |
1657 | it is the canonical extracted address which is all that is kept. */ | |
1658 | ||
1659 | case MAIL_CMD: | |
474f71bf | 1660 | smtp_mailcmd_count++; /* Count for no-mail log */ |
059ec3d9 PH |
1661 | if (sender_address != NULL) |
1662 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1663 | moan_smtp_batch(smtp_cmd_buffer, "503 Sender already given"); |
059ec3d9 | 1664 | |
ca86f471 | 1665 | if (smtp_cmd_data[0] == 0) |
059ec3d9 | 1666 | /* The function moan_smtp_batch() does not return. */ |
3ee512ff | 1667 | moan_smtp_batch(smtp_cmd_buffer, "501 MAIL FROM must have an address operand"); |
059ec3d9 PH |
1668 | |
1669 | /* Reset to start of message */ | |
1670 | ||
1671 | smtp_reset(reset_point); | |
1672 | ||
1673 | /* Apply SMTP rewrite */ | |
1674 | ||
1675 | raw_sender = ((rewrite_existflags & rewrite_smtp) != 0)? | |
ca86f471 PH |
1676 | rewrite_one(smtp_cmd_data, rewrite_smtp|rewrite_smtp_sender, NULL, FALSE, |
1677 | US"", global_rewrite_rules) : smtp_cmd_data; | |
059ec3d9 PH |
1678 | |
1679 | /* Extract the address; the TRUE flag allows <> as valid */ | |
1680 | ||
1681 | raw_sender = | |
1682 | parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain, | |
1683 | TRUE); | |
1684 | ||
1685 | if (raw_sender == NULL) | |
1686 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1687 | moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess); |
059ec3d9 PH |
1688 | |
1689 | sender_address = string_copy(raw_sender); | |
1690 | ||
1691 | /* Qualify unqualified sender addresses if permitted to do so. */ | |
1692 | ||
1693 | if (sender_domain == 0 && sender_address[0] != 0 && sender_address[0] != '@') | |
1694 | { | |
1695 | if (allow_unqualified_sender) | |
1696 | { | |
1697 | sender_address = rewrite_address_qualify(sender_address, FALSE); | |
1698 | DEBUG(D_receive) debug_printf("unqualified address %s accepted " | |
1699 | "and rewritten\n", raw_sender); | |
1700 | } | |
1701 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1702 | else moan_smtp_batch(smtp_cmd_buffer, "501 sender address must contain " |
059ec3d9 PH |
1703 | "a domain"); |
1704 | } | |
1705 | break; | |
1706 | ||
1707 | ||
1708 | /* The RCPT TO command requires an address as an operand. All we do | |
1709 | here is to parse it for syntactic correctness. There may be any number | |
1710 | of RCPT TO commands, specifying multiple senders. We build them all into | |
1711 | a data structure that is in argc/argv format. The start/end values | |
1712 | given by parse_extract_address are not used, as we keep only the | |
1713 | extracted address. */ | |
1714 | ||
1715 | case RCPT_CMD: | |
1716 | if (sender_address == NULL) | |
1717 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1718 | moan_smtp_batch(smtp_cmd_buffer, "503 No sender yet given"); |
059ec3d9 | 1719 | |
ca86f471 | 1720 | if (smtp_cmd_data[0] == 0) |
059ec3d9 | 1721 | /* The function moan_smtp_batch() does not return. */ |
3ee512ff | 1722 | moan_smtp_batch(smtp_cmd_buffer, "501 RCPT TO must have an address operand"); |
059ec3d9 PH |
1723 | |
1724 | /* Check maximum number allowed */ | |
1725 | ||
1726 | if (recipients_max > 0 && recipients_count + 1 > recipients_max) | |
1727 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1728 | moan_smtp_batch(smtp_cmd_buffer, "%s too many recipients", |
059ec3d9 PH |
1729 | recipients_max_reject? "552": "452"); |
1730 | ||
1731 | /* Apply SMTP rewrite, then extract address. Don't allow "<>" as a | |
1732 | recipient address */ | |
1733 | ||
1734 | recipient = ((rewrite_existflags & rewrite_smtp) != 0)? | |
ca86f471 PH |
1735 | rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"", |
1736 | global_rewrite_rules) : smtp_cmd_data; | |
059ec3d9 PH |
1737 | |
1738 | /* rfc821_domains = TRUE; << no longer needed */ | |
1739 | recipient = parse_extract_address(recipient, &errmess, &start, &end, | |
1740 | &recipient_domain, FALSE); | |
1741 | /* rfc821_domains = FALSE; << no longer needed */ | |
1742 | ||
1743 | if (recipient == NULL) | |
1744 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1745 | moan_smtp_batch(smtp_cmd_buffer, "501 %s", errmess); |
059ec3d9 PH |
1746 | |
1747 | /* If the recipient address is unqualified, qualify it if permitted. Then | |
1748 | add it to the list of recipients. */ | |
1749 | ||
1750 | if (recipient_domain == 0) | |
1751 | { | |
1752 | if (allow_unqualified_recipient) | |
1753 | { | |
1754 | DEBUG(D_receive) debug_printf("unqualified address %s accepted\n", | |
1755 | recipient); | |
1756 | recipient = rewrite_address_qualify(recipient, TRUE); | |
1757 | } | |
1758 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1759 | else moan_smtp_batch(smtp_cmd_buffer, "501 recipient address must contain " |
059ec3d9 PH |
1760 | "a domain"); |
1761 | } | |
1762 | receive_add_recipient(recipient, -1); | |
1763 | break; | |
1764 | ||
1765 | ||
1766 | /* The DATA command is legal only if it follows successful MAIL FROM | |
1767 | and RCPT TO commands. This function is complete when a valid DATA | |
1768 | command is encountered. */ | |
1769 | ||
1770 | case DATA_CMD: | |
1771 | if (sender_address == NULL || recipients_count <= 0) | |
1772 | { | |
1773 | /* The function moan_smtp_batch() does not return. */ | |
1774 | if (sender_address == NULL) | |
3ee512ff | 1775 | moan_smtp_batch(smtp_cmd_buffer, |
059ec3d9 PH |
1776 | "503 MAIL FROM:<sender> command must precede DATA"); |
1777 | else | |
3ee512ff | 1778 | moan_smtp_batch(smtp_cmd_buffer, |
059ec3d9 PH |
1779 | "503 RCPT TO:<recipient> must precede DATA"); |
1780 | } | |
1781 | else | |
1782 | { | |
1783 | done = 3; /* DATA successfully achieved */ | |
1784 | message_ended = END_NOTENDED; /* Indicate in middle of message */ | |
1785 | } | |
1786 | break; | |
1787 | ||
1788 | ||
1789 | /* The VRFY, EXPN, HELP, ETRN, and NOOP commands are ignored. */ | |
1790 | ||
1791 | case VRFY_CMD: | |
1792 | case EXPN_CMD: | |
1793 | case HELP_CMD: | |
1794 | case NOOP_CMD: | |
1795 | case ETRN_CMD: | |
1796 | bsmtp_transaction_linecount = receive_linecount; | |
1797 | break; | |
1798 | ||
1799 | ||
1800 | case EOF_CMD: | |
1801 | case QUIT_CMD: | |
1802 | done = 2; | |
1803 | break; | |
1804 | ||
1805 | ||
1806 | case BADARG_CMD: | |
1807 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1808 | moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected argument data"); |
059ec3d9 PH |
1809 | break; |
1810 | ||
1811 | ||
1812 | case BADCHAR_CMD: | |
1813 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1814 | moan_smtp_batch(smtp_cmd_buffer, "501 Unexpected NULL in SMTP command"); |
059ec3d9 PH |
1815 | break; |
1816 | ||
1817 | ||
1818 | default: | |
1819 | /* The function moan_smtp_batch() does not return. */ | |
3ee512ff | 1820 | moan_smtp_batch(smtp_cmd_buffer, "500 Command unrecognized"); |
059ec3d9 PH |
1821 | break; |
1822 | } | |
1823 | } | |
1824 | ||
1825 | return done - 2; /* Convert yield values */ | |
1826 | } | |
1827 | ||
1828 | ||
1829 | ||
1830 | ||
1831 | /************************************************* | |
1832 | * Start an SMTP session * | |
1833 | *************************************************/ | |
1834 | ||
1835 | /* This function is called at the start of an SMTP session. Thereafter, | |
1836 | smtp_setup_msg() is called to initiate each separate message. This | |
1837 | function does host-specific testing, and outputs the banner line. | |
1838 | ||
1839 | Arguments: none | |
1840 | Returns: FALSE if the session can not continue; something has | |
1841 | gone wrong, or the connection to the host is blocked | |
1842 | */ | |
1843 | ||
1844 | BOOL | |
1845 | smtp_start_session(void) | |
1846 | { | |
1847 | int size = 256; | |
4e88a19f PH |
1848 | int ptr, esclen; |
1849 | uschar *user_msg, *log_msg; | |
1850 | uschar *code, *esc; | |
059ec3d9 PH |
1851 | uschar *p, *s, *ss; |
1852 | ||
b4ed4da0 PH |
1853 | smtp_connection_start = time(NULL); |
1854 | for (smtp_ch_index = 0; smtp_ch_index < SMTP_HBUFF_SIZE; smtp_ch_index++) | |
1855 | smtp_connection_had[smtp_ch_index] = SCH_NONE; | |
1856 | smtp_ch_index = 0; | |
1857 | ||
00f00ca5 PH |
1858 | /* Default values for certain variables */ |
1859 | ||
059ec3d9 | 1860 | helo_seen = esmtp = helo_accept_junk = FALSE; |
b4ed4da0 | 1861 | smtp_mailcmd_count = 0; |
059ec3d9 PH |
1862 | count_nonmail = TRUE_UNSET; |
1863 | synprot_error_count = unknown_command_count = nonmail_command_count = 0; | |
1864 | smtp_delay_mail = smtp_rlm_base; | |
1865 | auth_advertised = FALSE; | |
1866 | pipelining_advertised = FALSE; | |
cf8b11a5 | 1867 | pipelining_enable = TRUE; |
059ec3d9 | 1868 | sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING; |
8f128379 | 1869 | smtp_exit_function_called = FALSE; /* For avoiding loop in not-quit exit */ |
059ec3d9 PH |
1870 | |
1871 | memset(sender_host_cache, 0, sizeof(sender_host_cache)); | |
1872 | ||
33d73e3b PH |
1873 | /* If receiving by -bs from a trusted user, or testing with -bh, we allow |
1874 | authentication settings from -oMaa to remain in force. */ | |
1875 | ||
1876 | if (!host_checking && !sender_host_notsocket) sender_host_authenticated = NULL; | |
059ec3d9 PH |
1877 | authenticated_by = NULL; |
1878 | ||
1879 | #ifdef SUPPORT_TLS | |
817d9f57 | 1880 | tls_in.cipher = tls_in.peerdn = NULL; |
9d1c15ef JH |
1881 | tls_in.ourcert = tls_in.peercert = NULL; |
1882 | tls_in.sni = NULL; | |
44662487 | 1883 | tls_in.ocsp = OCSP_NOT_REQ; |
059ec3d9 PH |
1884 | tls_advertised = FALSE; |
1885 | #endif | |
6c1c3d1d | 1886 | dsn_advertised = FALSE; |
d1a13eea JH |
1887 | #ifdef EXPERIMENTAL_INTERNATIONAL |
1888 | smtputf8_advertised = FALSE; | |
1889 | #endif | |
059ec3d9 PH |
1890 | |
1891 | /* Reset ACL connection variables */ | |
1892 | ||
38a0a95f | 1893 | acl_var_c = NULL; |
059ec3d9 | 1894 | |
ca86f471 | 1895 | /* Allow for trailing 0 in the command and data buffers. */ |
3ee512ff | 1896 | |
ca86f471 | 1897 | smtp_cmd_buffer = (uschar *)malloc(2*smtp_cmd_buffer_size + 2); |
3ee512ff | 1898 | if (smtp_cmd_buffer == NULL) |
059ec3d9 PH |
1899 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
1900 | "malloc() failed for SMTP command buffer"); | |
2416c261 | 1901 | smtp_cmd_buffer[0] = 0; |
ca86f471 | 1902 | smtp_data_buffer = smtp_cmd_buffer + smtp_cmd_buffer_size + 1; |
059ec3d9 PH |
1903 | |
1904 | /* For batched input, the protocol setting can be overridden from the | |
1905 | command line by a trusted caller. */ | |
1906 | ||
1907 | if (smtp_batched_input) | |
1908 | { | |
1909 | if (received_protocol == NULL) received_protocol = US"local-bsmtp"; | |
1910 | } | |
1911 | ||
1912 | /* For non-batched SMTP input, the protocol setting is forced here. It will be | |
1913 | reset later if any of EHLO/AUTH/STARTTLS are received. */ | |
1914 | ||
1915 | else | |
1916 | received_protocol = | |
e524074d | 1917 | (sender_host_address ? protocols : protocols_local) [pnormal]; |
059ec3d9 PH |
1918 | |
1919 | /* Set up the buffer for inputting using direct read() calls, and arrange to | |
1920 | call the local functions instead of the standard C ones. */ | |
1921 | ||
1922 | smtp_inbuffer = (uschar *)malloc(in_buffer_size); | |
1923 | if (smtp_inbuffer == NULL) | |
1924 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "malloc() failed for SMTP input buffer"); | |
1925 | receive_getc = smtp_getc; | |
1926 | receive_ungetc = smtp_ungetc; | |
1927 | receive_feof = smtp_feof; | |
1928 | receive_ferror = smtp_ferror; | |
58eb016e | 1929 | receive_smtp_buffered = smtp_buffered; |
059ec3d9 PH |
1930 | smtp_inptr = smtp_inend = smtp_inbuffer; |
1931 | smtp_had_eof = smtp_had_error = 0; | |
1932 | ||
1933 | /* Set up the message size limit; this may be host-specific */ | |
1934 | ||
d45b1de8 PH |
1935 | thismessage_size_limit = expand_string_integer(message_size_limit, TRUE); |
1936 | if (expand_string_message != NULL) | |
059ec3d9 PH |
1937 | { |
1938 | if (thismessage_size_limit == -1) | |
1939 | log_write(0, LOG_MAIN|LOG_PANIC, "unable to expand message_size_limit: " | |
1940 | "%s", expand_string_message); | |
1941 | else | |
1942 | log_write(0, LOG_MAIN|LOG_PANIC, "invalid message_size_limit: " | |
1943 | "%s", expand_string_message); | |
1944 | smtp_closedown(US"Temporary local problem - please try later"); | |
1945 | return FALSE; | |
1946 | } | |
1947 | ||
1948 | /* When a message is input locally via the -bs or -bS options, sender_host_ | |
1949 | unknown is set unless -oMa was used to force an IP address, in which case it | |
1950 | is checked like a real remote connection. When -bs is used from inetd, this | |
1951 | flag is not set, causing the sending host to be checked. The code that deals | |
1952 | with IP source routing (if configured) is never required for -bs or -bS and | |
1953 | the flag sender_host_notsocket is used to suppress it. | |
1954 | ||
1955 | If smtp_accept_max and smtp_accept_reserve are set, keep some connections in | |
1956 | reserve for certain hosts and/or networks. */ | |
1957 | ||
1958 | if (!sender_host_unknown) | |
1959 | { | |
1960 | int rc; | |
1961 | BOOL reserved_host = FALSE; | |
1962 | ||
1963 | /* Look up IP options (source routing info) on the socket if this is not an | |
1964 | -oMa "host", and if any are found, log them and drop the connection. | |
1965 | ||
1966 | Linux (and others now, see below) is different to everyone else, so there | |
1967 | has to be some conditional compilation here. Versions of Linux before 2.1.15 | |
1968 | used a structure whose name was "options". Somebody finally realized that | |
1969 | this name was silly, and it got changed to "ip_options". I use the | |
1970 | newer name here, but there is a fudge in the script that sets up os.h | |
1971 | to define a macro in older Linux systems. | |
1972 | ||
1973 | Sigh. Linux is a fast-moving target. Another generation of Linux uses | |
1974 | glibc 2, which has chosen ip_opts for the structure name. This is now | |
1975 | really a glibc thing rather than a Linux thing, so the condition name | |
1976 | has been changed to reflect this. It is relevant also to GNU/Hurd. | |
1977 | ||
1978 | Mac OS 10.x (Darwin) is like the later glibc versions, but without the | |
1979 | setting of the __GLIBC__ macro, so we can't detect it automatically. There's | |
1980 | a special macro defined in the os.h file. | |
1981 | ||
1982 | Some DGUX versions on older hardware appear not to support IP options at | |
1983 | all, so there is now a general macro which can be set to cut out this | |
1984 | support altogether. | |
1985 | ||
1986 | How to do this properly in IPv6 is not yet known. */ | |
1987 | ||
1988 | #if !HAVE_IPV6 && !defined(NO_IP_OPTIONS) | |
1989 | ||
1990 | #ifdef GLIBC_IP_OPTIONS | |
1991 | #if (!defined __GLIBC__) || (__GLIBC__ < 2) | |
1992 | #define OPTSTYLE 1 | |
1993 | #else | |
1994 | #define OPTSTYLE 2 | |
1995 | #endif | |
1996 | #elif defined DARWIN_IP_OPTIONS | |
1997 | #define OPTSTYLE 2 | |
1998 | #else | |
1999 | #define OPTSTYLE 3 | |
2000 | #endif | |
2001 | ||
2002 | if (!host_checking && !sender_host_notsocket) | |
2003 | { | |
2004 | #if OPTSTYLE == 1 | |
36a3b041 | 2005 | EXIM_SOCKLEN_T optlen = sizeof(struct ip_options) + MAX_IPOPTLEN; |
059ec3d9 PH |
2006 | struct ip_options *ipopt = store_get(optlen); |
2007 | #elif OPTSTYLE == 2 | |
2008 | struct ip_opts ipoptblock; | |
2009 | struct ip_opts *ipopt = &ipoptblock; | |
36a3b041 | 2010 | EXIM_SOCKLEN_T optlen = sizeof(ipoptblock); |
059ec3d9 PH |
2011 | #else |
2012 | struct ipoption ipoptblock; | |
2013 | struct ipoption *ipopt = &ipoptblock; | |
36a3b041 | 2014 | EXIM_SOCKLEN_T optlen = sizeof(ipoptblock); |
059ec3d9 PH |
2015 | #endif |
2016 | ||
2017 | /* Occasional genuine failures of getsockopt() have been seen - for | |
2018 | example, "reset by peer". Therefore, just log and give up on this | |
2019 | call, unless the error is ENOPROTOOPT. This error is given by systems | |
2020 | that have the interfaces but not the mechanism - e.g. GNU/Hurd at the time | |
2021 | of writing. So for that error, carry on - we just can't do an IP options | |
2022 | check. */ | |
2023 | ||
2024 | DEBUG(D_receive) debug_printf("checking for IP options\n"); | |
2025 | ||
2026 | if (getsockopt(fileno(smtp_out), IPPROTO_IP, IP_OPTIONS, (uschar *)(ipopt), | |
2027 | &optlen) < 0) | |
2028 | { | |
2029 | if (errno != ENOPROTOOPT) | |
2030 | { | |
2031 | log_write(0, LOG_MAIN, "getsockopt() failed from %s: %s", | |
2032 | host_and_ident(FALSE), strerror(errno)); | |
2033 | smtp_printf("451 SMTP service not available\r\n"); | |
2034 | return FALSE; | |
2035 | } | |
2036 | } | |
2037 | ||
2038 | /* Deal with any IP options that are set. On the systems I have looked at, | |
2039 | the value of MAX_IPOPTLEN has been 40, meaning that there should never be | |
2040 | more logging data than will fit in big_buffer. Nevertheless, after somebody | |
2041 | questioned this code, I've added in some paranoid checking. */ | |
2042 | ||
2043 | else if (optlen > 0) | |
2044 | { | |
2045 | uschar *p = big_buffer; | |
2046 | uschar *pend = big_buffer + big_buffer_size; | |
2047 | uschar *opt, *adptr; | |
2048 | int optcount; | |
2049 | struct in_addr addr; | |
2050 | ||
2051 | #if OPTSTYLE == 1 | |
2052 | uschar *optstart = (uschar *)(ipopt->__data); | |
2053 | #elif OPTSTYLE == 2 | |
2054 | uschar *optstart = (uschar *)(ipopt->ip_opts); | |
2055 | #else | |
2056 | uschar *optstart = (uschar *)(ipopt->ipopt_list); | |
2057 | #endif | |
2058 | ||
2059 | DEBUG(D_receive) debug_printf("IP options exist\n"); | |
2060 | ||
2061 | Ustrcpy(p, "IP options on incoming call:"); | |
2062 | p += Ustrlen(p); | |
2063 | ||
2064 | for (opt = optstart; opt != NULL && | |
2065 | opt < (uschar *)(ipopt) + optlen;) | |
2066 | { | |
2067 | switch (*opt) | |
2068 | { | |
2069 | case IPOPT_EOL: | |
2070 | opt = NULL; | |
2071 | break; | |
2072 | ||
2073 | case IPOPT_NOP: | |
2074 | opt++; | |
2075 | break; | |
2076 | ||
2077 | case IPOPT_SSRR: | |
2078 | case IPOPT_LSRR: | |
2079 | if (!string_format(p, pend-p, " %s [@%s", | |
2080 | (*opt == IPOPT_SSRR)? "SSRR" : "LSRR", | |
2081 | #if OPTSTYLE == 1 | |
2082 | inet_ntoa(*((struct in_addr *)(&(ipopt->faddr)))))) | |
2083 | #elif OPTSTYLE == 2 | |
2084 | inet_ntoa(ipopt->ip_dst))) | |
2085 | #else | |
2086 | inet_ntoa(ipopt->ipopt_dst))) | |
2087 | #endif | |
2088 | { | |
2089 | opt = NULL; | |
2090 | break; | |
2091 | } | |
2092 | ||
2093 | p += Ustrlen(p); | |
2094 | optcount = (opt[1] - 3) / sizeof(struct in_addr); | |
2095 | adptr = opt + 3; | |
2096 | while (optcount-- > 0) | |
2097 | { | |
2098 | memcpy(&addr, adptr, sizeof(addr)); | |
2099 | if (!string_format(p, pend - p - 1, "%s%s", | |
2100 | (optcount == 0)? ":" : "@", inet_ntoa(addr))) | |
2101 | { | |
2102 | opt = NULL; | |
2103 | break; | |
2104 | } | |
2105 | p += Ustrlen(p); | |
2106 | adptr += sizeof(struct in_addr); | |
2107 | } | |
2108 | *p++ = ']'; | |
2109 | opt += opt[1]; | |
2110 | break; | |
2111 | ||
2112 | default: | |
2113 | { | |
2114 | int i; | |
2115 | if (pend - p < 4 + 3*opt[1]) { opt = NULL; break; } | |
2116 | Ustrcat(p, "[ "); | |
2117 | p += 2; | |
2118 | for (i = 0; i < opt[1]; i++) | |
2119 | { | |
2120 | sprintf(CS p, "%2.2x ", opt[i]); | |
2121 | p += 3; | |
2122 | } | |
2123 | *p++ = ']'; | |
2124 | } | |
2125 | opt += opt[1]; | |
2126 | break; | |
2127 | } | |
2128 | } | |
2129 | ||
2130 | *p = 0; | |
2131 | log_write(0, LOG_MAIN, "%s", big_buffer); | |
2132 | ||
2133 | /* Refuse any call with IP options. This is what tcpwrappers 7.5 does. */ | |
2134 | ||
2135 | log_write(0, LOG_MAIN|LOG_REJECT, | |
2136 | "connection from %s refused (IP options)", host_and_ident(FALSE)); | |
2137 | ||
2138 | smtp_printf("554 SMTP service not available\r\n"); | |
2139 | return FALSE; | |
2140 | } | |
2141 | ||
2142 | /* Length of options = 0 => there are no options */ | |
2143 | ||
2144 | else DEBUG(D_receive) debug_printf("no IP options found\n"); | |
2145 | } | |
2146 | #endif /* HAVE_IPV6 && !defined(NO_IP_OPTIONS) */ | |
2147 | ||
2148 | /* Set keep-alive in socket options. The option is on by default. This | |
2149 | setting is an attempt to get rid of some hanging connections that stick in | |
2150 | read() when the remote end (usually a dialup) goes away. */ | |
2151 | ||
2152 | if (smtp_accept_keepalive && !sender_host_notsocket) | |
2153 | ip_keepalive(fileno(smtp_out), sender_host_address, FALSE); | |
2154 | ||
2155 | /* If the current host matches host_lookup, set the name by doing a | |
2156 | reverse lookup. On failure, sender_host_name will be NULL and | |
2157 | host_lookup_failed will be TRUE. This may or may not be serious - optional | |
2158 | checks later. */ | |
2159 | ||
2160 | if (verify_check_host(&host_lookup) == OK) | |
2161 | { | |
2162 | (void)host_name_lookup(); | |
2163 | host_build_sender_fullhost(); | |
2164 | } | |
2165 | ||
2166 | /* Delay this until we have the full name, if it is looked up. */ | |
2167 | ||
2168 | set_process_info("handling incoming connection from %s", | |
2169 | host_and_ident(FALSE)); | |
2170 | ||
1ad6489e JH |
2171 | /* Expand smtp_receive_timeout, if needed */ |
2172 | ||
2173 | if (smtp_receive_timeout_s) | |
2174 | { | |
2175 | uschar * exp; | |
2176 | if ( !(exp = expand_string(smtp_receive_timeout_s)) | |
2177 | || !(*exp) | |
2178 | || (smtp_receive_timeout = readconf_readtime(exp, 0, FALSE)) < 0 | |
2179 | ) | |
2180 | log_write(0, LOG_MAIN|LOG_PANIC, | |
2181 | "bad value for smtp_receive_timeout: '%s'", exp ? exp : US""); | |
2182 | } | |
2183 | ||
059ec3d9 PH |
2184 | /* Start up TLS if tls_on_connect is set. This is for supporting the legacy |
2185 | smtps port for use with older style SSL MTAs. */ | |
2186 | ||
2187 | #ifdef SUPPORT_TLS | |
817d9f57 | 2188 | if (tls_in.on_connect && tls_server_start(tls_require_ciphers) != OK) |
059ec3d9 PH |
2189 | return FALSE; |
2190 | #endif | |
2191 | ||
2192 | /* Test for explicit connection rejection */ | |
2193 | ||
2194 | if (verify_check_host(&host_reject_connection) == OK) | |
2195 | { | |
2196 | log_write(L_connection_reject, LOG_MAIN|LOG_REJECT, "refused connection " | |
2197 | "from %s (host_reject_connection)", host_and_ident(FALSE)); | |
2198 | smtp_printf("554 SMTP service not available\r\n"); | |
2199 | return FALSE; | |
2200 | } | |
2201 | ||
afb3eaaf PH |
2202 | /* Test with TCP Wrappers if so configured. There is a problem in that |
2203 | hosts_ctl() returns 0 (deny) under a number of system failure circumstances, | |
2204 | such as disks dying. In these cases, it is desirable to reject with a 4xx | |
2205 | error instead of a 5xx error. There isn't a "right" way to detect such | |
2206 | problems. The following kludge is used: errno is zeroed before calling | |
2207 | hosts_ctl(). If the result is "reject", a 5xx error is given only if the | |
2208 | value of errno is 0 or ENOENT (which happens if /etc/hosts.{allow,deny} does | |
2209 | not exist). */ | |
059ec3d9 PH |
2210 | |
2211 | #ifdef USE_TCP_WRAPPERS | |
afb3eaaf | 2212 | errno = 0; |
5dc43717 JJ |
2213 | tcp_wrappers_name = expand_string(tcp_wrappers_daemon_name); |
2214 | if (tcp_wrappers_name == NULL) | |
2215 | { | |
2216 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" " | |
2217 | "(tcp_wrappers_name) failed: %s", string_printing(tcp_wrappers_name), | |
2218 | expand_string_message); | |
2219 | } | |
2220 | if (!hosts_ctl(tcp_wrappers_name, | |
059ec3d9 PH |
2221 | (sender_host_name == NULL)? STRING_UNKNOWN : CS sender_host_name, |
2222 | (sender_host_address == NULL)? STRING_UNKNOWN : CS sender_host_address, | |
2223 | (sender_ident == NULL)? STRING_UNKNOWN : CS sender_ident)) | |
2224 | { | |
afb3eaaf PH |
2225 | if (errno == 0 || errno == ENOENT) |
2226 | { | |
2227 | HDEBUG(D_receive) debug_printf("tcp wrappers rejection\n"); | |
2228 | log_write(L_connection_reject, | |
2229 | LOG_MAIN|LOG_REJECT, "refused connection from %s " | |
2230 | "(tcp wrappers)", host_and_ident(FALSE)); | |
2231 | smtp_printf("554 SMTP service not available\r\n"); | |
2232 | } | |
2233 | else | |
2234 | { | |
2235 | int save_errno = errno; | |
2236 | HDEBUG(D_receive) debug_printf("tcp wrappers rejected with unexpected " | |
2237 | "errno value %d\n", save_errno); | |
2238 | log_write(L_connection_reject, | |
2239 | LOG_MAIN|LOG_REJECT, "temporarily refused connection from %s " | |
2240 | "(tcp wrappers errno=%d)", host_and_ident(FALSE), save_errno); | |
2241 | smtp_printf("451 Temporary local problem - please try later\r\n"); | |
2242 | } | |
059ec3d9 PH |
2243 | return FALSE; |
2244 | } | |
2245 | #endif | |
2246 | ||
b01dd148 PH |
2247 | /* Check for reserved slots. The value of smtp_accept_count has already been |
2248 | incremented to include this process. */ | |
059ec3d9 PH |
2249 | |
2250 | if (smtp_accept_max > 0 && | |
b01dd148 | 2251 | smtp_accept_count > smtp_accept_max - smtp_accept_reserve) |
059ec3d9 PH |
2252 | { |
2253 | if ((rc = verify_check_host(&smtp_reserve_hosts)) != OK) | |
2254 | { | |
2255 | log_write(L_connection_reject, | |
2256 | LOG_MAIN, "temporarily refused connection from %s: not in " | |
2257 | "reserve list: connected=%d max=%d reserve=%d%s", | |
b01dd148 | 2258 | host_and_ident(FALSE), smtp_accept_count - 1, smtp_accept_max, |
059ec3d9 PH |
2259 | smtp_accept_reserve, (rc == DEFER)? " (lookup deferred)" : ""); |
2260 | smtp_printf("421 %s: Too many concurrent SMTP connections; " | |
2261 | "please try again later\r\n", smtp_active_hostname); | |
2262 | return FALSE; | |
2263 | } | |
2264 | reserved_host = TRUE; | |
2265 | } | |
2266 | ||
2267 | /* If a load level above which only messages from reserved hosts are | |
2268 | accepted is set, check the load. For incoming calls via the daemon, the | |
2269 | check is done in the superior process if there are no reserved hosts, to | |
2270 | save a fork. In all cases, the load average will already be available | |
2271 | in a global variable at this point. */ | |
2272 | ||
2273 | if (smtp_load_reserve >= 0 && | |
2274 | load_average > smtp_load_reserve && | |
2275 | !reserved_host && | |
2276 | verify_check_host(&smtp_reserve_hosts) != OK) | |
2277 | { | |
2278 | log_write(L_connection_reject, | |
2279 | LOG_MAIN, "temporarily refused connection from %s: not in " | |
2280 | "reserve list and load average = %.2f", host_and_ident(FALSE), | |
2281 | (double)load_average/1000.0); | |
2282 | smtp_printf("421 %s: Too much load; please try again later\r\n", | |
2283 | smtp_active_hostname); | |
2284 | return FALSE; | |
2285 | } | |
2286 | ||
2287 | /* Determine whether unqualified senders or recipients are permitted | |
2288 | for this host. Unfortunately, we have to do this every time, in order to | |
2289 | set the flags so that they can be inspected when considering qualifying | |
2290 | addresses in the headers. For a site that permits no qualification, this | |
2291 | won't take long, however. */ | |
2292 | ||
2293 | allow_unqualified_sender = | |
2294 | verify_check_host(&sender_unqualified_hosts) == OK; | |
2295 | ||
2296 | allow_unqualified_recipient = | |
2297 | verify_check_host(&recipient_unqualified_hosts) == OK; | |
2298 | ||
2299 | /* Determine whether HELO/EHLO is required for this host. The requirement | |
2300 | can be hard or soft. */ | |
2301 | ||
2302 | helo_required = verify_check_host(&helo_verify_hosts) == OK; | |
2303 | if (!helo_required) | |
2304 | helo_verify = verify_check_host(&helo_try_verify_hosts) == OK; | |
2305 | ||
2306 | /* Determine whether this hosts is permitted to send syntactic junk | |
2307 | after a HELO or EHLO command. */ | |
2308 | ||
2309 | helo_accept_junk = verify_check_host(&helo_accept_junk_hosts) == OK; | |
2310 | } | |
2311 | ||
2312 | /* For batch SMTP input we are now done. */ | |
2313 | ||
2314 | if (smtp_batched_input) return TRUE; | |
2315 | ||
a3c86431 TL |
2316 | #ifdef EXPERIMENTAL_PROXY |
2317 | /* If valid Proxy Protocol source is connecting, set up session. | |
2318 | * Failure will not allow any SMTP function other than QUIT. */ | |
2319 | proxy_session = FALSE; | |
2320 | proxy_session_failed = FALSE; | |
2321 | if (check_proxy_protocol_host()) | |
2322 | { | |
2323 | if (setup_proxy_protocol_host() == FALSE) | |
2324 | { | |
2325 | proxy_session_failed = TRUE; | |
2326 | DEBUG(D_receive) | |
2327 | debug_printf("Failure to extract proxied host, only QUIT allowed\n"); | |
2328 | } | |
2329 | else | |
2330 | { | |
2331 | sender_host_name = NULL; | |
2332 | (void)host_name_lookup(); | |
2333 | host_build_sender_fullhost(); | |
2334 | } | |
2335 | } | |
2336 | #endif | |
2337 | ||
059ec3d9 PH |
2338 | /* Run the ACL if it exists */ |
2339 | ||
4e88a19f | 2340 | user_msg = NULL; |
059ec3d9 PH |
2341 | if (acl_smtp_connect != NULL) |
2342 | { | |
2343 | int rc; | |
64ffc24f | 2344 | rc = acl_check(ACL_WHERE_CONNECT, NULL, acl_smtp_connect, &user_msg, |
059ec3d9 PH |
2345 | &log_msg); |
2346 | if (rc != OK) | |
2347 | { | |
2348 | (void)smtp_handle_acl_fail(ACL_WHERE_CONNECT, rc, user_msg, log_msg); | |
2349 | return FALSE; | |
2350 | } | |
2351 | } | |
2352 | ||
2353 | /* Output the initial message for a two-way SMTP connection. It may contain | |
2354 | newlines, which then cause a multi-line response to be given. */ | |
2355 | ||
4e88a19f PH |
2356 | code = US"220"; /* Default status code */ |
2357 | esc = US""; /* Default extended status code */ | |
2358 | esclen = 0; /* Length of esc */ | |
2359 | ||
2360 | if (user_msg == NULL) | |
2361 | { | |
2362 | s = expand_string(smtp_banner); | |
2363 | if (s == NULL) | |
2364 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" (smtp_banner) " | |
2365 | "failed: %s", smtp_banner, expand_string_message); | |
2366 | } | |
2367 | else | |
2368 | { | |
2369 | int codelen = 3; | |
2370 | s = user_msg; | |
2371 | smtp_message_code(&code, &codelen, &s, NULL); | |
d6a96edc | 2372 | if (codelen > 4) |
4e88a19f PH |
2373 | { |
2374 | esc = code + 4; | |
2375 | esclen = codelen - 4; | |
2376 | } | |
2377 | } | |
059ec3d9 PH |
2378 | |
2379 | /* Remove any terminating newlines; might as well remove trailing space too */ | |
2380 | ||
2381 | p = s + Ustrlen(s); | |
2382 | while (p > s && isspace(p[-1])) p--; | |
2383 | *p = 0; | |
2384 | ||
2385 | /* It seems that CC:Mail is braindead, and assumes that the greeting message | |
2386 | is all contained in a single IP packet. The original code wrote out the | |
2387 | greeting using several calls to fprint/fputc, and on busy servers this could | |
2388 | cause it to be split over more than one packet - which caused CC:Mail to fall | |
2389 | over when it got the second part of the greeting after sending its first | |
2390 | command. Sigh. To try to avoid this, build the complete greeting message | |
2391 | first, and output it in one fell swoop. This gives a better chance of it | |
2392 | ending up as a single packet. */ | |
2393 | ||
2394 | ss = store_get(size); | |
2395 | ptr = 0; | |
2396 | ||
2397 | p = s; | |
2398 | do /* At least once, in case we have an empty string */ | |
2399 | { | |
2400 | int len; | |
2401 | uschar *linebreak = Ustrchr(p, '\n'); | |
4e88a19f | 2402 | ss = string_cat(ss, &size, &ptr, code, 3); |
059ec3d9 PH |
2403 | if (linebreak == NULL) |
2404 | { | |
2405 | len = Ustrlen(p); | |
4e88a19f | 2406 | ss = string_cat(ss, &size, &ptr, US" ", 1); |
059ec3d9 PH |
2407 | } |
2408 | else | |
2409 | { | |
2410 | len = linebreak - p; | |
4e88a19f | 2411 | ss = string_cat(ss, &size, &ptr, US"-", 1); |
059ec3d9 | 2412 | } |
4e88a19f | 2413 | ss = string_cat(ss, &size, &ptr, esc, esclen); |
059ec3d9 PH |
2414 | ss = string_cat(ss, &size, &ptr, p, len); |
2415 | ss = string_cat(ss, &size, &ptr, US"\r\n", 2); | |
2416 | p += len; | |
2417 | if (linebreak != NULL) p++; | |
2418 | } | |
2419 | while (*p != 0); | |
2420 | ||
2421 | ss[ptr] = 0; /* string_cat leaves room for this */ | |
2422 | ||
2423 | /* Before we write the banner, check that there is no input pending, unless | |
2424 | this synchronisation check is disabled. */ | |
2425 | ||
a14e5636 | 2426 | if (!check_sync()) |
059ec3d9 | 2427 | { |
a14e5636 PH |
2428 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol " |
2429 | "synchronization error (input sent without waiting for greeting): " | |
2430 | "rejected connection from %s input=\"%s\"", host_and_ident(TRUE), | |
2431 | string_printing(smtp_inptr)); | |
2432 | smtp_printf("554 SMTP synchronization error\r\n"); | |
2433 | return FALSE; | |
059ec3d9 PH |
2434 | } |
2435 | ||
2436 | /* Now output the banner */ | |
2437 | ||
2438 | smtp_printf("%s", ss); | |
2439 | return TRUE; | |
2440 | } | |
2441 | ||
2442 | ||
2443 | ||
2444 | ||
2445 | ||
2446 | /************************************************* | |
2447 | * Handle SMTP syntax and protocol errors * | |
2448 | *************************************************/ | |
2449 | ||
2450 | /* Write to the log for SMTP syntax errors in incoming commands, if configured | |
2451 | to do so. Then transmit the error response. The return value depends on the | |
2452 | number of syntax and protocol errors in this SMTP session. | |
2453 | ||
2454 | Arguments: | |
2455 | type error type, given as a log flag bit | |
2456 | code response code; <= 0 means don't send a response | |
2457 | data data to reflect in the response (can be NULL) | |
2458 | errmess the error message | |
2459 | ||
2460 | Returns: -1 limit of syntax/protocol errors NOT exceeded | |
2461 | +1 limit of syntax/protocol errors IS exceeded | |
2462 | ||
2463 | These values fit in with the values of the "done" variable in the main | |
2464 | processing loop in smtp_setup_msg(). */ | |
2465 | ||
2466 | static int | |
2467 | synprot_error(int type, int code, uschar *data, uschar *errmess) | |
2468 | { | |
2469 | int yield = -1; | |
2470 | ||
2471 | log_write(type, LOG_MAIN, "SMTP %s error in \"%s\" %s %s", | |
2472 | (type == L_smtp_syntax_error)? "syntax" : "protocol", | |
3ee512ff | 2473 | string_printing(smtp_cmd_buffer), host_and_ident(TRUE), errmess); |
059ec3d9 PH |
2474 | |
2475 | if (++synprot_error_count > smtp_max_synprot_errors) | |
2476 | { | |
2477 | yield = 1; | |
2478 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
2479 | "syntax or protocol errors (last command was \"%s\")", | |
0ebc4d69 | 2480 | host_and_ident(FALSE), string_printing(smtp_cmd_buffer)); |
059ec3d9 PH |
2481 | } |
2482 | ||
2483 | if (code > 0) | |
2484 | { | |
2485 | smtp_printf("%d%c%s%s%s\r\n", code, (yield == 1)? '-' : ' ', | |
2486 | (data == NULL)? US"" : data, (data == NULL)? US"" : US": ", errmess); | |
2487 | if (yield == 1) | |
2488 | smtp_printf("%d Too many syntax or protocol errors\r\n", code); | |
2489 | } | |
2490 | ||
2491 | return yield; | |
2492 | } | |
2493 | ||
2494 | ||
2495 | ||
2496 | ||
2497 | /************************************************* | |
2498 | * Log incomplete transactions * | |
2499 | *************************************************/ | |
2500 | ||
2501 | /* This function is called after a transaction has been aborted by RSET, QUIT, | |
2502 | connection drops or other errors. It logs the envelope information received | |
2503 | so far in order to preserve address verification attempts. | |
2504 | ||
2505 | Argument: string to indicate what aborted the transaction | |
2506 | Returns: nothing | |
2507 | */ | |
2508 | ||
2509 | static void | |
2510 | incomplete_transaction_log(uschar *what) | |
2511 | { | |
2512 | if (sender_address == NULL || /* No transaction in progress */ | |
2513 | (log_write_selector & L_smtp_incomplete_transaction) == 0 /* Not logging */ | |
2514 | ) return; | |
2515 | ||
2516 | /* Build list of recipients for logging */ | |
2517 | ||
2518 | if (recipients_count > 0) | |
2519 | { | |
2520 | int i; | |
2521 | raw_recipients = store_get(recipients_count * sizeof(uschar *)); | |
2522 | for (i = 0; i < recipients_count; i++) | |
2523 | raw_recipients[i] = recipients_list[i].address; | |
2524 | raw_recipients_count = recipients_count; | |
2525 | } | |
2526 | ||
2527 | log_write(L_smtp_incomplete_transaction, LOG_MAIN|LOG_SENDER|LOG_RECIPIENTS, | |
2528 | "%s incomplete transaction (%s)", host_and_ident(TRUE), what); | |
2529 | } | |
2530 | ||
2531 | ||
2532 | ||
2533 | ||
2534 | /************************************************* | |
2535 | * Send SMTP response, possibly multiline * | |
2536 | *************************************************/ | |
2537 | ||
2538 | /* There are, it seems, broken clients out there that cannot handle multiline | |
2539 | responses. If no_multiline_responses is TRUE (it can be set from an ACL), we | |
2540 | output nothing for non-final calls, and only the first line for anything else. | |
2541 | ||
2542 | Arguments: | |
a5bd321b | 2543 | code SMTP code, may involve extended status codes |
d6a96edc | 2544 | codelen length of smtp code; if > 4 there's an ESC |
059ec3d9 PH |
2545 | final FALSE if the last line isn't the final line |
2546 | msg message text, possibly containing newlines | |
2547 | ||
2548 | Returns: nothing | |
2549 | */ | |
2550 | ||
2551 | void | |
a5bd321b | 2552 | smtp_respond(uschar* code, int codelen, BOOL final, uschar *msg) |
059ec3d9 | 2553 | { |
a5bd321b PH |
2554 | int esclen = 0; |
2555 | uschar *esc = US""; | |
2556 | ||
059ec3d9 PH |
2557 | if (!final && no_multiline_responses) return; |
2558 | ||
d6a96edc | 2559 | if (codelen > 4) |
a5bd321b PH |
2560 | { |
2561 | esc = code + 4; | |
2562 | esclen = codelen - 4; | |
2563 | } | |
2564 | ||
2679d413 PH |
2565 | /* If this is the first output for a (non-batch) RCPT command, see if all RCPTs |
2566 | have had the same. Note: this code is also present in smtp_printf(). It would | |
2567 | be tidier to have it only in one place, but when it was added, it was easier to | |
2568 | do it that way, so as not to have to mess with the code for the RCPT command, | |
2569 | which sometimes uses smtp_printf() and sometimes smtp_respond(). */ | |
2570 | ||
2571 | if (rcpt_in_progress) | |
2572 | { | |
2573 | if (rcpt_smtp_response == NULL) | |
2574 | rcpt_smtp_response = string_copy(msg); | |
2575 | else if (rcpt_smtp_response_same && | |
2576 | Ustrcmp(rcpt_smtp_response, msg) != 0) | |
2577 | rcpt_smtp_response_same = FALSE; | |
2578 | rcpt_in_progress = FALSE; | |
2579 | } | |
2580 | ||
2581 | /* Not output the message, splitting it up into multiple lines if necessary. */ | |
2582 | ||
059ec3d9 PH |
2583 | for (;;) |
2584 | { | |
2585 | uschar *nl = Ustrchr(msg, '\n'); | |
2586 | if (nl == NULL) | |
2587 | { | |
a5bd321b | 2588 | smtp_printf("%.3s%c%.*s%s\r\n", code, final? ' ':'-', esclen, esc, msg); |
059ec3d9 PH |
2589 | return; |
2590 | } | |
2591 | else if (nl[1] == 0 || no_multiline_responses) | |
2592 | { | |
a5bd321b PH |
2593 | smtp_printf("%.3s%c%.*s%.*s\r\n", code, final? ' ':'-', esclen, esc, |
2594 | (int)(nl - msg), msg); | |
059ec3d9 PH |
2595 | return; |
2596 | } | |
2597 | else | |
2598 | { | |
a5bd321b | 2599 | smtp_printf("%.3s-%.*s%.*s\r\n", code, esclen, esc, (int)(nl - msg), msg); |
059ec3d9 PH |
2600 | msg = nl + 1; |
2601 | while (isspace(*msg)) msg++; | |
2602 | } | |
2603 | } | |
2604 | } | |
2605 | ||
2606 | ||
2607 | ||
2608 | ||
4e88a19f PH |
2609 | /************************************************* |
2610 | * Parse user SMTP message * | |
2611 | *************************************************/ | |
2612 | ||
2613 | /* This function allows for user messages overriding the response code details | |
2614 | by providing a suitable response code string at the start of the message | |
2615 | user_msg. Check the message for starting with a response code and optionally an | |
2616 | extended status code. If found, check that the first digit is valid, and if so, | |
2617 | change the code pointer and length to use the replacement. An invalid code | |
2618 | causes a panic log; in this case, if the log messages is the same as the user | |
2619 | message, we must also adjust the value of the log message to show the code that | |
2620 | is actually going to be used (the original one). | |
2621 | ||
2622 | This function is global because it is called from receive.c as well as within | |
2623 | this module. | |
2624 | ||
d6a96edc PH |
2625 | Note that the code length returned includes the terminating whitespace |
2626 | character, which is always included in the regex match. | |
2627 | ||
4e88a19f PH |
2628 | Arguments: |
2629 | code SMTP code, may involve extended status codes | |
d6a96edc | 2630 | codelen length of smtp code; if > 4 there's an ESC |
4e88a19f PH |
2631 | msg message text |
2632 | log_msg optional log message, to be adjusted with the new SMTP code | |
2633 | ||
2634 | Returns: nothing | |
2635 | */ | |
2636 | ||
2637 | void | |
2638 | smtp_message_code(uschar **code, int *codelen, uschar **msg, uschar **log_msg) | |
2639 | { | |
2640 | int n; | |
2641 | int ovector[3]; | |
2642 | ||
2643 | if (msg == NULL || *msg == NULL) return; | |
2644 | ||
2645 | n = pcre_exec(regex_smtp_code, NULL, CS *msg, Ustrlen(*msg), 0, | |
2646 | PCRE_EOPT, ovector, sizeof(ovector)/sizeof(int)); | |
2647 | if (n < 0) return; | |
2648 | ||
2649 | if ((*msg)[0] != (*code)[0]) | |
2650 | { | |
2651 | log_write(0, LOG_MAIN|LOG_PANIC, "configured error code starts with " | |
2652 | "incorrect digit (expected %c) in \"%s\"", (*code)[0], *msg); | |
2653 | if (log_msg != NULL && *log_msg == *msg) | |
2654 | *log_msg = string_sprintf("%s %s", *code, *log_msg + ovector[1]); | |
2655 | } | |
2656 | else | |
2657 | { | |
2658 | *code = *msg; | |
2659 | *codelen = ovector[1]; /* Includes final space */ | |
2660 | } | |
2661 | *msg += ovector[1]; /* Chop the code off the message */ | |
2662 | return; | |
2663 | } | |
2664 | ||
2665 | ||
2666 | ||
2667 | ||
059ec3d9 PH |
2668 | /************************************************* |
2669 | * Handle an ACL failure * | |
2670 | *************************************************/ | |
2671 | ||
2672 | /* This function is called when acl_check() fails. As well as calls from within | |
2673 | this module, it is called from receive.c for an ACL after DATA. It sorts out | |
2674 | logging the incident, and sets up the error response. A message containing | |
2675 | newlines is turned into a multiline SMTP response, but for logging, only the | |
2676 | first line is used. | |
2677 | ||
a5bd321b PH |
2678 | There's a table of default permanent failure response codes to use in |
2679 | globals.c, along with the table of names. VFRY is special. Despite RFC1123 it | |
2680 | defaults disabled in Exim. However, discussion in connection with RFC 821bis | |
2681 | (aka RFC 2821) has concluded that the response should be 252 in the disabled | |
2682 | state, because there are broken clients that try VRFY before RCPT. A 5xx | |
2683 | response should be given only when the address is positively known to be | |
2684 | undeliverable. Sigh. Also, for ETRN, 458 is given on refusal, and for AUTH, | |
2685 | 503. | |
2686 | ||
2687 | From Exim 4.63, it is possible to override the response code details by | |
2688 | providing a suitable response code string at the start of the message provided | |
2689 | in user_msg. The code's first digit is checked for validity. | |
059ec3d9 PH |
2690 | |
2691 | Arguments: | |
2692 | where where the ACL was called from | |
2693 | rc the failure code | |
2694 | user_msg a message that can be included in an SMTP response | |
2695 | log_msg a message for logging | |
2696 | ||
2697 | Returns: 0 in most cases | |
2698 | 2 if the failure code was FAIL_DROP, in which case the | |
2699 | SMTP connection should be dropped (this value fits with the | |
2700 | "done" variable in smtp_setup_msg() below) | |
2701 | */ | |
2702 | ||
2703 | int | |
2704 | smtp_handle_acl_fail(int where, int rc, uschar *user_msg, uschar *log_msg) | |
2705 | { | |
059ec3d9 | 2706 | BOOL drop = rc == FAIL_DROP; |
a5bd321b | 2707 | int codelen = 3; |
a5bd321b | 2708 | uschar *smtp_code; |
059ec3d9 PH |
2709 | uschar *lognl; |
2710 | uschar *sender_info = US""; | |
64ffc24f | 2711 | uschar *what = |
8523533c | 2712 | #ifdef WITH_CONTENT_SCAN |
64ffc24f | 2713 | (where == ACL_WHERE_MIME)? US"during MIME ACL checks" : |
8e669ac1 | 2714 | #endif |
64ffc24f PH |
2715 | (where == ACL_WHERE_PREDATA)? US"DATA" : |
2716 | (where == ACL_WHERE_DATA)? US"after DATA" : | |
8ccd00b1 | 2717 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2718 | (where == ACL_WHERE_PRDR)? US"after DATA PRDR" : |
2719 | #endif | |
ca86f471 | 2720 | (smtp_cmd_data == NULL)? |
64ffc24f | 2721 | string_sprintf("%s in \"connect\" ACL", acl_wherenames[where]) : |
ca86f471 | 2722 | string_sprintf("%s %s", acl_wherenames[where], smtp_cmd_data); |
059ec3d9 PH |
2723 | |
2724 | if (drop) rc = FAIL; | |
2725 | ||
4e88a19f | 2726 | /* Set the default SMTP code, and allow a user message to change it. */ |
a5bd321b PH |
2727 | |
2728 | smtp_code = (rc != FAIL)? US"451" : acl_wherecodes[where]; | |
4e88a19f | 2729 | smtp_message_code(&smtp_code, &codelen, &user_msg, &log_msg); |
a5bd321b | 2730 | |
059ec3d9 PH |
2731 | /* We used to have sender_address here; however, there was a bug that was not |
2732 | updating sender_address after a rewrite during a verify. When this bug was | |
2733 | fixed, sender_address at this point became the rewritten address. I'm not sure | |
2734 | this is what should be logged, so I've changed to logging the unrewritten | |
2735 | address to retain backward compatibility. */ | |
2736 | ||
8523533c | 2737 | #ifndef WITH_CONTENT_SCAN |
059ec3d9 | 2738 | if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA) |
8523533c TK |
2739 | #else |
2740 | if (where == ACL_WHERE_RCPT || where == ACL_WHERE_DATA || where == ACL_WHERE_MIME) | |
2741 | #endif | |
059ec3d9 | 2742 | { |
b98bb9ac PP |
2743 | sender_info = string_sprintf("F=<%s>%s%s%s%s ", |
2744 | sender_address_unrewritten ? sender_address_unrewritten : sender_address, | |
2745 | sender_host_authenticated ? US" A=" : US"", | |
2746 | sender_host_authenticated ? sender_host_authenticated : US"", | |
2747 | sender_host_authenticated && authenticated_id ? US":" : US"", | |
2748 | sender_host_authenticated && authenticated_id ? authenticated_id : US"" | |
2749 | ); | |
059ec3d9 PH |
2750 | } |
2751 | ||
2752 | /* If there's been a sender verification failure with a specific message, and | |
2753 | we have not sent a response about it yet, do so now, as a preliminary line for | |
278c6e6c PH |
2754 | failures, but not defers. However, always log it for defer, and log it for fail |
2755 | unless the sender_verify_fail log selector has been turned off. */ | |
059ec3d9 PH |
2756 | |
2757 | if (sender_verified_failed != NULL && | |
2758 | !testflag(sender_verified_failed, af_sverify_told)) | |
2759 | { | |
2679d413 PH |
2760 | BOOL save_rcpt_in_progress = rcpt_in_progress; |
2761 | rcpt_in_progress = FALSE; /* So as not to treat these as the error */ | |
2762 | ||
059ec3d9 PH |
2763 | setflag(sender_verified_failed, af_sverify_told); |
2764 | ||
278c6e6c PH |
2765 | if (rc != FAIL || (log_extra_selector & LX_sender_verify_fail) != 0) |
2766 | log_write(0, LOG_MAIN|LOG_REJECT, "%s sender verify %s for <%s>%s", | |
2767 | host_and_ident(TRUE), | |
2768 | ((sender_verified_failed->special_action & 255) == DEFER)? "defer":"fail", | |
2769 | sender_verified_failed->address, | |
2770 | (sender_verified_failed->message == NULL)? US"" : | |
2771 | string_sprintf(": %s", sender_verified_failed->message)); | |
059ec3d9 PH |
2772 | |
2773 | if (rc == FAIL && sender_verified_failed->user_message != NULL) | |
a5bd321b | 2774 | smtp_respond(smtp_code, codelen, FALSE, string_sprintf( |
059ec3d9 PH |
2775 | testflag(sender_verified_failed, af_verify_pmfail)? |
2776 | "Postmaster verification failed while checking <%s>\n%s\n" | |
2777 | "Several RFCs state that you are required to have a postmaster\n" | |
2778 | "mailbox for each mail domain. This host does not accept mail\n" | |
2779 | "from domains whose servers reject the postmaster address." | |
2780 | : | |
2781 | testflag(sender_verified_failed, af_verify_nsfail)? | |
2782 | "Callback setup failed while verifying <%s>\n%s\n" | |
2783 | "The initial connection, or a HELO or MAIL FROM:<> command was\n" | |
2784 | "rejected. Refusing MAIL FROM:<> does not help fight spam, disregards\n" | |
2785 | "RFC requirements, and stops you from receiving standard bounce\n" | |
2786 | "messages. This host does not accept mail from domains whose servers\n" | |
2787 | "refuse bounces." | |
2788 | : | |
2789 | "Verification failed for <%s>\n%s", | |
2790 | sender_verified_failed->address, | |
2791 | sender_verified_failed->user_message)); | |
2679d413 PH |
2792 | |
2793 | rcpt_in_progress = save_rcpt_in_progress; | |
059ec3d9 PH |
2794 | } |
2795 | ||
2796 | /* Sort out text for logging */ | |
2797 | ||
2798 | log_msg = (log_msg == NULL)? US"" : string_sprintf(": %s", log_msg); | |
2799 | lognl = Ustrchr(log_msg, '\n'); | |
2800 | if (lognl != NULL) *lognl = 0; | |
2801 | ||
2802 | /* Send permanent failure response to the command, but the code used isn't | |
2803 | always a 5xx one - see comments at the start of this function. If the original | |
2804 | rc was FAIL_DROP we drop the connection and yield 2. */ | |
2805 | ||
a5bd321b | 2806 | if (rc == FAIL) smtp_respond(smtp_code, codelen, TRUE, (user_msg == NULL)? |
059ec3d9 PH |
2807 | US"Administrative prohibition" : user_msg); |
2808 | ||
2809 | /* Send temporary failure response to the command. Don't give any details, | |
2810 | unless acl_temp_details is set. This is TRUE for a callout defer, a "defer" | |
2811 | verb, and for a header verify when smtp_return_error_details is set. | |
2812 | ||
2813 | This conditional logic is all somewhat of a mess because of the odd | |
2814 | interactions between temp_details and return_error_details. One day it should | |
2815 | be re-implemented in a tidier fashion. */ | |
2816 | ||
2817 | else | |
2818 | { | |
2819 | if (acl_temp_details && user_msg != NULL) | |
2820 | { | |
2821 | if (smtp_return_error_details && | |
2822 | sender_verified_failed != NULL && | |
2823 | sender_verified_failed->message != NULL) | |
2824 | { | |
a5bd321b | 2825 | smtp_respond(smtp_code, codelen, FALSE, sender_verified_failed->message); |
059ec3d9 | 2826 | } |
a5bd321b | 2827 | smtp_respond(smtp_code, codelen, TRUE, user_msg); |
059ec3d9 PH |
2828 | } |
2829 | else | |
a5bd321b PH |
2830 | smtp_respond(smtp_code, codelen, TRUE, |
2831 | US"Temporary local problem - please try later"); | |
059ec3d9 PH |
2832 | } |
2833 | ||
6ea85e9a PH |
2834 | /* Log the incident to the logs that are specified by log_reject_target |
2835 | (default main, reject). This can be empty to suppress logging of rejections. If | |
2836 | the connection is not forcibly to be dropped, return 0. Otherwise, log why it | |
2837 | is closing if required and return 2. */ | |
059ec3d9 | 2838 | |
6ea85e9a | 2839 | if (log_reject_target != 0) |
887291d2 | 2840 | { |
e45a1c37 | 2841 | #ifdef SUPPORT_TLS |
887291d2 JH |
2842 | uschar * s = s_tlslog(NULL, NULL, NULL); |
2843 | if (!s) s = US""; | |
e45a1c37 | 2844 | #else |
887291d2 | 2845 | uschar * s = US""; |
e45a1c37 | 2846 | #endif |
887291d2 JH |
2847 | log_write(0, log_reject_target, "%s%s %s%srejected %s%s", |
2848 | host_and_ident(TRUE), s, | |
6ea85e9a | 2849 | sender_info, (rc == FAIL)? US"" : US"temporarily ", what, log_msg); |
887291d2 | 2850 | } |
059ec3d9 PH |
2851 | |
2852 | if (!drop) return 0; | |
2853 | ||
2854 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by DROP in ACL", | |
2855 | smtp_get_connection_info()); | |
8f128379 PH |
2856 | |
2857 | /* Run the not-quit ACL, but without any custom messages. This should not be a | |
2858 | problem, because we get here only if some other ACL has issued "drop", and | |
2859 | in that case, *its* custom messages will have been used above. */ | |
2860 | ||
2861 | smtp_notquit_exit(US"acl-drop", NULL, NULL); | |
059ec3d9 PH |
2862 | return 2; |
2863 | } | |
2864 | ||
2865 | ||
2866 | ||
2867 | ||
8f128379 PH |
2868 | /************************************************* |
2869 | * Handle SMTP exit when QUIT is not given * | |
2870 | *************************************************/ | |
2871 | ||
2872 | /* This function provides a logging/statistics hook for when an SMTP connection | |
2873 | is dropped on the floor or the other end goes away. It's a global function | |
2874 | because it's called from receive.c as well as this module. As well as running | |
2875 | the NOTQUIT ACL, if there is one, this function also outputs a final SMTP | |
2876 | response, either with a custom message from the ACL, or using a default. There | |
2877 | is one case, however, when no message is output - after "drop". In that case, | |
2878 | the ACL that obeyed "drop" has already supplied the custom message, and NULL is | |
2879 | passed to this function. | |
2880 | ||
2881 | In case things go wrong while processing this function, causing an error that | |
2882 | may re-enter this funtion, there is a recursion check. | |
2883 | ||
2884 | Arguments: | |
2885 | reason What $smtp_notquit_reason will be set to in the ACL; | |
2886 | if NULL, the ACL is not run | |
2887 | code The error code to return as part of the response | |
2888 | defaultrespond The default message if there's no user_msg | |
2889 | ||
2890 | Returns: Nothing | |
2891 | */ | |
2892 | ||
2893 | void | |
2894 | smtp_notquit_exit(uschar *reason, uschar *code, uschar *defaultrespond, ...) | |
2895 | { | |
2896 | int rc; | |
2897 | uschar *user_msg = NULL; | |
2898 | uschar *log_msg = NULL; | |
2899 | ||
2900 | /* Check for recursive acll */ | |
2901 | ||
2902 | if (smtp_exit_function_called) | |
2903 | { | |
2904 | log_write(0, LOG_PANIC, "smtp_notquit_exit() called more than once (%s)", | |
2905 | reason); | |
2906 | return; | |
2907 | } | |
2908 | smtp_exit_function_called = TRUE; | |
2909 | ||
2910 | /* Call the not-QUIT ACL, if there is one, unless no reason is given. */ | |
2911 | ||
2912 | if (acl_smtp_notquit != NULL && reason != NULL) | |
2913 | { | |
2914 | smtp_notquit_reason = reason; | |
2915 | rc = acl_check(ACL_WHERE_NOTQUIT, NULL, acl_smtp_notquit, &user_msg, | |
2916 | &log_msg); | |
2917 | if (rc == ERROR) | |
2918 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL for not-QUIT returned ERROR: %s", | |
2919 | log_msg); | |
2920 | } | |
2921 | ||
2922 | /* Write an SMTP response if we are expected to give one. As the default | |
2923 | responses are all internal, they should always fit in the buffer, but code a | |
2924 | warning, just in case. Note that string_vformat() still leaves a complete | |
2925 | string, even if it is incomplete. */ | |
2926 | ||
2927 | if (code != NULL && defaultrespond != NULL) | |
2928 | { | |
2929 | if (user_msg == NULL) | |
2930 | { | |
2931 | uschar buffer[128]; | |
2932 | va_list ap; | |
2933 | va_start(ap, defaultrespond); | |
2934 | if (!string_vformat(buffer, sizeof(buffer), CS defaultrespond, ap)) | |
2935 | log_write(0, LOG_MAIN|LOG_PANIC, "string too large in smtp_notquit_exit()"); | |
2936 | smtp_printf("%s %s\r\n", code, buffer); | |
2937 | va_end(ap); | |
2938 | } | |
2939 | else | |
2940 | smtp_respond(code, 3, TRUE, user_msg); | |
2941 | mac_smtp_fflush(); | |
2942 | } | |
2943 | } | |
2944 | ||
2945 | ||
2946 | ||
2947 | ||
d7b47fd0 PH |
2948 | /************************************************* |
2949 | * Verify HELO argument * | |
2950 | *************************************************/ | |
2951 | ||
2952 | /* This function is called if helo_verify_hosts or helo_try_verify_hosts is | |
2953 | matched. It is also called from ACL processing if verify = helo is used and | |
2954 | verification was not previously tried (i.e. helo_try_verify_hosts was not | |
2955 | matched). The result of its processing is to set helo_verified and | |
2956 | helo_verify_failed. These variables should both be FALSE for this function to | |
2957 | be called. | |
2958 | ||
2959 | Note that EHLO/HELO is legitimately allowed to quote an address literal. Allow | |
2960 | for IPv6 ::ffff: literals. | |
2961 | ||
2962 | Argument: none | |
2963 | Returns: TRUE if testing was completed; | |
2964 | FALSE on a temporary failure | |
2965 | */ | |
2966 | ||
2967 | BOOL | |
2968 | smtp_verify_helo(void) | |
2969 | { | |
2970 | BOOL yield = TRUE; | |
2971 | ||
2972 | HDEBUG(D_receive) debug_printf("verifying EHLO/HELO argument \"%s\"\n", | |
2973 | sender_helo_name); | |
2974 | ||
2975 | if (sender_helo_name == NULL) | |
2976 | { | |
2977 | HDEBUG(D_receive) debug_printf("no EHLO/HELO command was issued\n"); | |
2978 | } | |
2979 | ||
d1d5595c PH |
2980 | /* Deal with the case of -bs without an IP address */ |
2981 | ||
2982 | else if (sender_host_address == NULL) | |
2983 | { | |
2984 | HDEBUG(D_receive) debug_printf("no client IP address: assume success\n"); | |
2985 | helo_verified = TRUE; | |
2986 | } | |
2987 | ||
2988 | /* Deal with the more common case when there is a sending IP address */ | |
2989 | ||
d7b47fd0 PH |
2990 | else if (sender_helo_name[0] == '[') |
2991 | { | |
2992 | helo_verified = Ustrncmp(sender_helo_name+1, sender_host_address, | |
2993 | Ustrlen(sender_host_address)) == 0; | |
2994 | ||
2995 | #if HAVE_IPV6 | |
2996 | if (!helo_verified) | |
2997 | { | |
2998 | if (strncmpic(sender_host_address, US"::ffff:", 7) == 0) | |
2999 | helo_verified = Ustrncmp(sender_helo_name + 1, | |
3000 | sender_host_address + 7, Ustrlen(sender_host_address) - 7) == 0; | |
3001 | } | |
3002 | #endif | |
3003 | ||
3004 | HDEBUG(D_receive) | |
3005 | { if (helo_verified) debug_printf("matched host address\n"); } | |
3006 | } | |
3007 | ||
3008 | /* Do a reverse lookup if one hasn't already given a positive or negative | |
3009 | response. If that fails, or the name doesn't match, try checking with a forward | |
3010 | lookup. */ | |
3011 | ||
3012 | else | |
3013 | { | |
3014 | if (sender_host_name == NULL && !host_lookup_failed) | |
3015 | yield = host_name_lookup() != DEFER; | |
3016 | ||
3017 | /* If a host name is known, check it and all its aliases. */ | |
3018 | ||
1705dd20 JH |
3019 | if (sender_host_name) |
3020 | if ((helo_verified = strcmpic(sender_host_name, sender_helo_name) == 0)) | |
d7b47fd0 | 3021 | { |
1705dd20 | 3022 | sender_helo_dnssec = sender_host_dnssec; |
d7b47fd0 PH |
3023 | HDEBUG(D_receive) debug_printf("matched host name\n"); |
3024 | } | |
3025 | else | |
3026 | { | |
3027 | uschar **aliases = sender_host_aliases; | |
1705dd20 JH |
3028 | while (*aliases) |
3029 | if ((helo_verified = strcmpic(*aliases++, sender_helo_name) == 0)) | |
3030 | { | |
3031 | sender_helo_dnssec = sender_host_dnssec; | |
3032 | break; | |
3033 | } | |
3034 | ||
3035 | HDEBUG(D_receive) if (helo_verified) | |
d7b47fd0 | 3036 | debug_printf("matched alias %s\n", *(--aliases)); |
d7b47fd0 | 3037 | } |
d7b47fd0 PH |
3038 | |
3039 | /* Final attempt: try a forward lookup of the helo name */ | |
3040 | ||
3041 | if (!helo_verified) | |
3042 | { | |
3043 | int rc; | |
3044 | host_item h; | |
1705dd20 JH |
3045 | dnssec_domains d; |
3046 | host_item *hh; | |
3047 | ||
d7b47fd0 PH |
3048 | h.name = sender_helo_name; |
3049 | h.address = NULL; | |
3050 | h.mx = MX_NONE; | |
3051 | h.next = NULL; | |
1705dd20 JH |
3052 | d.request = US"*"; |
3053 | d.require = US""; | |
3054 | ||
d7b47fd0 PH |
3055 | HDEBUG(D_receive) debug_printf("getting IP address for %s\n", |
3056 | sender_helo_name); | |
1705dd20 JH |
3057 | rc = host_find_bydns(&h, NULL, HOST_FIND_BY_A, |
3058 | NULL, NULL, NULL, &d, NULL, NULL); | |
d7b47fd0 | 3059 | if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL) |
1705dd20 | 3060 | for (hh = &h; hh; hh = hh->next) |
d7b47fd0 PH |
3061 | if (Ustrcmp(hh->address, sender_host_address) == 0) |
3062 | { | |
3063 | helo_verified = TRUE; | |
1705dd20 | 3064 | if (h.dnssec == DS_YES) sender_helo_dnssec = TRUE; |
d7b47fd0 | 3065 | HDEBUG(D_receive) |
1705dd20 JH |
3066 | { |
3067 | debug_printf("IP address for %s matches calling address\n" | |
3068 | "Forward DNS security status: %sverified\n", | |
3069 | sender_helo_name, sender_helo_dnssec ? "" : "un"); | |
3070 | } | |
d7b47fd0 PH |
3071 | break; |
3072 | } | |
d7b47fd0 PH |
3073 | } |
3074 | } | |
3075 | ||
d1d5595c | 3076 | if (!helo_verified) helo_verify_failed = TRUE; /* We've tried ... */ |
d7b47fd0 PH |
3077 | return yield; |
3078 | } | |
3079 | ||
3080 | ||
3081 | ||
3082 | ||
4e88a19f PH |
3083 | /************************************************* |
3084 | * Send user response message * | |
3085 | *************************************************/ | |
3086 | ||
3087 | /* This function is passed a default response code and a user message. It calls | |
3088 | smtp_message_code() to check and possibly modify the response code, and then | |
3089 | calls smtp_respond() to transmit the response. I put this into a function | |
3090 | just to avoid a lot of repetition. | |
3091 | ||
3092 | Arguments: | |
3093 | code the response code | |
3094 | user_msg the user message | |
3095 | ||
3096 | Returns: nothing | |
3097 | */ | |
3098 | ||
3099 | static void | |
3100 | smtp_user_msg(uschar *code, uschar *user_msg) | |
3101 | { | |
3102 | int len = 3; | |
3103 | smtp_message_code(&code, &len, &user_msg, NULL); | |
3104 | smtp_respond(code, len, TRUE, user_msg); | |
3105 | } | |
3106 | ||
3107 | ||
3108 | ||
b3ef41c9 JH |
3109 | static int |
3110 | smtp_in_auth(auth_instance *au, uschar ** s, uschar ** ss) | |
3111 | { | |
3112 | const uschar *set_id = NULL; | |
3113 | int rc, i; | |
3114 | ||
3115 | /* Run the checking code, passing the remainder of the command line as | |
3116 | data. Initials the $auth<n> variables as empty. Initialize $0 empty and set | |
3117 | it as the only set numerical variable. The authenticator may set $auth<n> | |
3118 | and also set other numeric variables. The $auth<n> variables are preferred | |
3119 | nowadays; the numerical variables remain for backwards compatibility. | |
3120 | ||
3121 | Afterwards, have a go at expanding the set_id string, even if | |
3122 | authentication failed - for bad passwords it can be useful to log the | |
3123 | userid. On success, require set_id to expand and exist, and put it in | |
3124 | authenticated_id. Save this in permanent store, as the working store gets | |
3125 | reset at HELO, RSET, etc. */ | |
3126 | ||
3127 | for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; | |
3128 | expand_nmax = 0; | |
3129 | expand_nlength[0] = 0; /* $0 contains nothing */ | |
3130 | ||
3131 | rc = (au->info->servercode)(au, smtp_cmd_data); | |
3132 | if (au->set_id) set_id = expand_string(au->set_id); | |
3133 | expand_nmax = -1; /* Reset numeric variables */ | |
3134 | for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; /* Reset $auth<n> */ | |
3135 | ||
3136 | /* The value of authenticated_id is stored in the spool file and printed in | |
3137 | log lines. It must not contain binary zeros or newline characters. In | |
3138 | normal use, it never will, but when playing around or testing, this error | |
3139 | can (did) happen. To guard against this, ensure that the id contains only | |
3140 | printing characters. */ | |
3141 | ||
3142 | if (set_id) set_id = string_printing(set_id); | |
3143 | ||
3144 | /* For the non-OK cases, set up additional logging data if set_id | |
3145 | is not empty. */ | |
3146 | ||
3147 | if (rc != OK) | |
3148 | set_id = set_id && *set_id | |
3149 | ? string_sprintf(" (set_id=%s)", set_id) : US""; | |
3150 | ||
3151 | /* Switch on the result */ | |
3152 | ||
3153 | switch(rc) | |
3154 | { | |
3155 | case OK: | |
3156 | if (!au->set_id || set_id) /* Complete success */ | |
3157 | { | |
3158 | if (set_id) authenticated_id = string_copy_malloc(set_id); | |
3159 | sender_host_authenticated = au->name; | |
3160 | authentication_failed = FALSE; | |
3161 | authenticated_fail_id = NULL; /* Impossible to already be set? */ | |
3162 | ||
3163 | received_protocol = | |
3164 | (sender_host_address ? protocols : protocols_local) | |
3165 | [pextend + pauthed + (tls_in.active >= 0 ? pcrpted:0)]; | |
3166 | *s = *ss = US"235 Authentication succeeded"; | |
3167 | authenticated_by = au; | |
3168 | break; | |
3169 | } | |
3170 | ||
3171 | /* Authentication succeeded, but we failed to expand the set_id string. | |
3172 | Treat this as a temporary error. */ | |
3173 | ||
3174 | auth_defer_msg = expand_string_message; | |
3175 | /* Fall through */ | |
3176 | ||
3177 | case DEFER: | |
3178 | if (set_id) authenticated_fail_id = string_copy_malloc(set_id); | |
3179 | *s = string_sprintf("435 Unable to authenticate at present%s", | |
3180 | auth_defer_user_msg); | |
3181 | *ss = string_sprintf("435 Unable to authenticate at present%s: %s", | |
3182 | set_id, auth_defer_msg); | |
3183 | break; | |
3184 | ||
3185 | case BAD64: | |
3186 | *s = *ss = US"501 Invalid base64 data"; | |
3187 | break; | |
3188 | ||
3189 | case CANCELLED: | |
3190 | *s = *ss = US"501 Authentication cancelled"; | |
3191 | break; | |
3192 | ||
3193 | case UNEXPECTED: | |
3194 | *s = *ss = US"553 Initial data not expected"; | |
3195 | break; | |
3196 | ||
3197 | case FAIL: | |
3198 | if (set_id) authenticated_fail_id = string_copy_malloc(set_id); | |
3199 | *s = US"535 Incorrect authentication data"; | |
3200 | *ss = string_sprintf("535 Incorrect authentication data%s", set_id); | |
3201 | break; | |
3202 | ||
3203 | default: | |
3204 | if (set_id) authenticated_fail_id = string_copy_malloc(set_id); | |
3205 | *s = US"435 Internal error"; | |
3206 | *ss = string_sprintf("435 Internal error%s: return %d from authentication " | |
3207 | "check", set_id, rc); | |
3208 | break; | |
3209 | } | |
3210 | ||
3211 | return rc; | |
3212 | } | |
3213 | ||
3214 | ||
3215 | ||
059ec3d9 PH |
3216 | /************************************************* |
3217 | * Initialize for SMTP incoming message * | |
3218 | *************************************************/ | |
3219 | ||
3220 | /* This function conducts the initial dialogue at the start of an incoming SMTP | |
3221 | message, and builds a list of recipients. However, if the incoming message | |
3222 | is part of a batch (-bS option) a separate function is called since it would | |
3223 | be messy having tests splattered about all over this function. This function | |
3224 | therefore handles the case where interaction is occurring. The input and output | |
3225 | files are set up in smtp_in and smtp_out. | |
3226 | ||
3227 | The global recipients_list is set to point to a vector of recipient_item | |
3228 | blocks, whose number is given by recipients_count. This is extended by the | |
3229 | receive_add_recipient() function. The global variable sender_address is set to | |
3230 | the sender's address. The yield is +1 if a message has been successfully | |
3231 | started, 0 if a QUIT command was encountered or the connection was refused from | |
3232 | the particular host, or -1 if the connection was lost. | |
3233 | ||
3234 | Argument: none | |
3235 | ||
3236 | Returns: > 0 message successfully started (reached DATA) | |
3237 | = 0 QUIT read or end of file reached or call refused | |
3238 | < 0 lost connection | |
3239 | */ | |
3240 | ||
3241 | int | |
3242 | smtp_setup_msg(void) | |
3243 | { | |
3244 | int done = 0; | |
3245 | BOOL toomany = FALSE; | |
3246 | BOOL discarded = FALSE; | |
3247 | BOOL last_was_rej_mail = FALSE; | |
3248 | BOOL last_was_rcpt = FALSE; | |
3249 | void *reset_point = store_get(0); | |
3250 | ||
3251 | DEBUG(D_receive) debug_printf("smtp_setup_msg entered\n"); | |
3252 | ||
3253 | /* Reset for start of new message. We allow one RSET not to be counted as a | |
3254 | nonmail command, for those MTAs that insist on sending it between every | |
3255 | message. Ditto for EHLO/HELO and for STARTTLS, to allow for going in and out of | |
3256 | TLS between messages (an Exim client may do this if it has messages queued up | |
3257 | for the host). Note: we do NOT reset AUTH at this point. */ | |
3258 | ||
3259 | smtp_reset(reset_point); | |
3260 | message_ended = END_NOTSTARTED; | |
3261 | ||
3262 | cmd_list[CMD_LIST_RSET].is_mail_cmd = TRUE; | |
3263 | cmd_list[CMD_LIST_HELO].is_mail_cmd = TRUE; | |
3264 | cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE; | |
3265 | #ifdef SUPPORT_TLS | |
3266 | cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = TRUE; | |
b3ef41c9 | 3267 | cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE; |
059ec3d9 PH |
3268 | #endif |
3269 | ||
3270 | /* Set the local signal handler for SIGTERM - it tries to end off tidily */ | |
3271 | ||
3272 | os_non_restarting_signal(SIGTERM, command_sigterm_handler); | |
3273 | ||
3274 | /* Batched SMTP is handled in a different function. */ | |
3275 | ||
3276 | if (smtp_batched_input) return smtp_setup_batch_msg(); | |
3277 | ||
3278 | /* Deal with SMTP commands. This loop is exited by setting done to a POSITIVE | |
3279 | value. The values are 2 larger than the required yield of the function. */ | |
3280 | ||
3281 | while (done <= 0) | |
3282 | { | |
55414b25 | 3283 | const uschar **argv; |
059ec3d9 PH |
3284 | uschar *etrn_command; |
3285 | uschar *etrn_serialize_key; | |
3286 | uschar *errmess; | |
4e88a19f PH |
3287 | uschar *log_msg, *smtp_code; |
3288 | uschar *user_msg = NULL; | |
059ec3d9 PH |
3289 | uschar *recipient = NULL; |
3290 | uschar *hello = NULL; | |
059ec3d9 PH |
3291 | uschar *s, *ss; |
3292 | BOOL was_rej_mail = FALSE; | |
3293 | BOOL was_rcpt = FALSE; | |
3294 | void (*oldsignal)(int); | |
3295 | pid_t pid; | |
3296 | int start, end, sender_domain, recipient_domain; | |
3297 | int ptr, size, rc; | |
aa7751be | 3298 | int c; |
059ec3d9 | 3299 | auth_instance *au; |
6c1c3d1d WB |
3300 | uschar *orcpt = NULL; |
3301 | int flags; | |
059ec3d9 | 3302 | |
b3ef41c9 JH |
3303 | #if defined(SUPPORT_TLS) && defined(AUTH_TLS) |
3304 | /* Check once per STARTTLS or SSL-on-connect for a TLS AUTH */ | |
3305 | if ( tls_in.active >= 0 | |
3306 | && tls_in.peercert | |
3307 | && tls_in.certificate_verified | |
3308 | && cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd | |
3309 | ) | |
3310 | { | |
3311 | cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = FALSE; | |
3312 | if (acl_smtp_auth) | |
3313 | { | |
3314 | rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth, &user_msg, &log_msg); | |
3315 | if (rc != OK) | |
3316 | { | |
3317 | done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg); | |
3318 | continue; | |
3319 | } | |
3320 | } | |
3321 | ||
3322 | for (au = auths; au; au = au->next) | |
3323 | if (strcmpic(US"tls", au->driver_name) == 0) | |
3324 | { | |
3325 | smtp_cmd_data = NULL; | |
3326 | ||
3327 | if ((c = smtp_in_auth(au, &s, &ss)) != OK) | |
3328 | log_write(0, LOG_MAIN|LOG_REJECT, "%s authenticator failed for %s: %s", | |
3329 | au->name, host_and_ident(FALSE), ss); | |
3330 | else | |
3331 | DEBUG(D_auth) debug_printf("tls auth succeeded\n"); | |
3332 | ||
3333 | break; | |
3334 | } | |
3335 | } | |
3336 | #endif | |
3337 | ||
059ec3d9 PH |
3338 | switch(smtp_read_command(TRUE)) |
3339 | { | |
3340 | /* The AUTH command is not permitted to occur inside a transaction, and may | |
c46782ef PH |
3341 | occur successfully only once per connection. Actually, that isn't quite |
3342 | true. When TLS is started, all previous information about a connection must | |
3343 | be discarded, so a new AUTH is permitted at that time. | |
3344 | ||
3345 | AUTH may only be used when it has been advertised. However, it seems that | |
3346 | there are clients that send AUTH when it hasn't been advertised, some of | |
3347 | them even doing this after HELO. And there are MTAs that accept this. Sigh. | |
3348 | So there's a get-out that allows this to happen. | |
059ec3d9 PH |
3349 | |
3350 | AUTH is initially labelled as a "nonmail command" so that one occurrence | |
3351 | doesn't get counted. We change the label here so that multiple failing | |
3352 | AUTHS will eventually hit the nonmail threshold. */ | |
3353 | ||
3354 | case AUTH_CMD: | |
b4ed4da0 | 3355 | HAD(SCH_AUTH); |
059ec3d9 PH |
3356 | authentication_failed = TRUE; |
3357 | cmd_list[CMD_LIST_AUTH].is_mail_cmd = FALSE; | |
3358 | ||
c46782ef | 3359 | if (!auth_advertised && !allow_auth_unadvertised) |
059ec3d9 PH |
3360 | { |
3361 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3362 | US"AUTH command used when not advertised"); | |
3363 | break; | |
3364 | } | |
b3ef41c9 | 3365 | if (sender_host_authenticated) |
059ec3d9 PH |
3366 | { |
3367 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3368 | US"already authenticated"); | |
3369 | break; | |
3370 | } | |
b3ef41c9 | 3371 | if (sender_address) |
059ec3d9 PH |
3372 | { |
3373 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3374 | US"not permitted in mail transaction"); | |
3375 | break; | |
3376 | } | |
3377 | ||
3378 | /* Check the ACL */ | |
3379 | ||
b3ef41c9 | 3380 | if (acl_smtp_auth) |
059ec3d9 | 3381 | { |
64ffc24f | 3382 | rc = acl_check(ACL_WHERE_AUTH, NULL, acl_smtp_auth, &user_msg, &log_msg); |
059ec3d9 PH |
3383 | if (rc != OK) |
3384 | { | |
3385 | done = smtp_handle_acl_fail(ACL_WHERE_AUTH, rc, user_msg, log_msg); | |
3386 | break; | |
3387 | } | |
3388 | } | |
3389 | ||
3390 | /* Find the name of the requested authentication mechanism. */ | |
3391 | ||
ca86f471 PH |
3392 | s = smtp_cmd_data; |
3393 | while ((c = *smtp_cmd_data) != 0 && !isspace(c)) | |
059ec3d9 PH |
3394 | { |
3395 | if (!isalnum(c) && c != '-' && c != '_') | |
3396 | { | |
3397 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
3398 | US"invalid character in authentication mechanism name"); | |
3399 | goto COMMAND_LOOP; | |
3400 | } | |
ca86f471 | 3401 | smtp_cmd_data++; |
059ec3d9 PH |
3402 | } |
3403 | ||
3404 | /* If not at the end of the line, we must be at white space. Terminate the | |
3405 | name and move the pointer on to any data that may be present. */ | |
3406 | ||
ca86f471 | 3407 | if (*smtp_cmd_data != 0) |
059ec3d9 | 3408 | { |
ca86f471 PH |
3409 | *smtp_cmd_data++ = 0; |
3410 | while (isspace(*smtp_cmd_data)) smtp_cmd_data++; | |
059ec3d9 PH |
3411 | } |
3412 | ||
3413 | /* Search for an authentication mechanism which is configured for use | |
c46782ef PH |
3414 | as a server and which has been advertised (unless, sigh, allow_auth_ |
3415 | unadvertised is set). */ | |
059ec3d9 | 3416 | |
b3ef41c9 | 3417 | for (au = auths; au; au = au->next) |
059ec3d9 | 3418 | if (strcmpic(s, au->public_name) == 0 && au->server && |
b3ef41c9 JH |
3419 | (au->advertised || allow_auth_unadvertised)) |
3420 | break; | |
059ec3d9 | 3421 | |
b3ef41c9 | 3422 | if (au) |
059ec3d9 | 3423 | { |
b3ef41c9 | 3424 | c = smtp_in_auth(au, &s, &ss); |
059ec3d9 | 3425 | |
b3ef41c9 JH |
3426 | smtp_printf("%s\r\n", s); |
3427 | if (c != OK) | |
3428 | log_write(0, LOG_MAIN|LOG_REJECT, "%s authenticator failed for %s: %s", | |
3429 | au->name, host_and_ident(FALSE), ss); | |
059ec3d9 | 3430 | } |
b3ef41c9 JH |
3431 | else |
3432 | done = synprot_error(L_smtp_protocol_error, 504, NULL, | |
3433 | string_sprintf("%s authentication mechanism not supported", s)); | |
059ec3d9 PH |
3434 | |
3435 | break; /* AUTH_CMD */ | |
3436 | ||
3437 | /* The HELO/EHLO commands are permitted to appear in the middle of a | |
3438 | session as well as at the beginning. They have the effect of a reset in | |
3439 | addition to their other functions. Their absence at the start cannot be | |
3440 | taken to be an error. | |
3441 | ||
3442 | RFC 2821 says: | |
3443 | ||
3444 | If the EHLO command is not acceptable to the SMTP server, 501, 500, | |
3445 | or 502 failure replies MUST be returned as appropriate. The SMTP | |
3446 | server MUST stay in the same state after transmitting these replies | |
3447 | that it was in before the EHLO was received. | |
3448 | ||
3449 | Therefore, we do not do the reset until after checking the command for | |
3450 | acceptability. This change was made for Exim release 4.11. Previously | |
3451 | it did the reset first. */ | |
3452 | ||
3453 | case HELO_CMD: | |
b4ed4da0 | 3454 | HAD(SCH_HELO); |
059ec3d9 PH |
3455 | hello = US"HELO"; |
3456 | esmtp = FALSE; | |
3457 | goto HELO_EHLO; | |
3458 | ||
3459 | case EHLO_CMD: | |
b4ed4da0 | 3460 | HAD(SCH_EHLO); |
059ec3d9 PH |
3461 | hello = US"EHLO"; |
3462 | esmtp = TRUE; | |
3463 | ||
3464 | HELO_EHLO: /* Common code for HELO and EHLO */ | |
3465 | cmd_list[CMD_LIST_HELO].is_mail_cmd = FALSE; | |
3466 | cmd_list[CMD_LIST_EHLO].is_mail_cmd = FALSE; | |
3467 | ||
3468 | /* Reject the HELO if its argument was invalid or non-existent. A | |
3469 | successful check causes the argument to be saved in malloc store. */ | |
3470 | ||
ca86f471 | 3471 | if (!check_helo(smtp_cmd_data)) |
059ec3d9 PH |
3472 | { |
3473 | smtp_printf("501 Syntactically invalid %s argument(s)\r\n", hello); | |
3474 | ||
3475 | log_write(0, LOG_MAIN|LOG_REJECT, "rejected %s from %s: syntactically " | |
3476 | "invalid argument(s): %s", hello, host_and_ident(FALSE), | |
3ee512ff PH |
3477 | (*smtp_cmd_argument == 0)? US"(no argument given)" : |
3478 | string_printing(smtp_cmd_argument)); | |
059ec3d9 PH |
3479 | |
3480 | if (++synprot_error_count > smtp_max_synprot_errors) | |
3481 | { | |
3482 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
3483 | "syntax or protocol errors (last command was \"%s\")", | |
0ebc4d69 | 3484 | host_and_ident(FALSE), string_printing(smtp_cmd_buffer)); |
059ec3d9 PH |
3485 | done = 1; |
3486 | } | |
3487 | ||
3488 | break; | |
3489 | } | |
3490 | ||
3491 | /* If sender_host_unknown is true, we have got here via the -bs interface, | |
3492 | not called from inetd. Otherwise, we are running an IP connection and the | |
3493 | host address will be set. If the helo name is the primary name of this | |
3494 | host and we haven't done a reverse lookup, force one now. If helo_required | |
3495 | is set, ensure that the HELO name matches the actual host. If helo_verify | |
3496 | is set, do the same check, but softly. */ | |
3497 | ||
3498 | if (!sender_host_unknown) | |
3499 | { | |
3500 | BOOL old_helo_verified = helo_verified; | |
ca86f471 | 3501 | uschar *p = smtp_cmd_data; |
059ec3d9 PH |
3502 | |
3503 | while (*p != 0 && !isspace(*p)) { *p = tolower(*p); p++; } | |
3504 | *p = 0; | |
3505 | ||
3506 | /* Force a reverse lookup if HELO quoted something in helo_lookup_domains | |
3507 | because otherwise the log can be confusing. */ | |
3508 | ||
3509 | if (sender_host_name == NULL && | |
3510 | (deliver_domain = sender_helo_name, /* set $domain */ | |
55414b25 | 3511 | match_isinlist(sender_helo_name, CUSS &helo_lookup_domains, 0, |
059ec3d9 PH |
3512 | &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL)) == OK) |
3513 | (void)host_name_lookup(); | |
3514 | ||
3515 | /* Rebuild the fullhost info to include the HELO name (and the real name | |
3516 | if it was looked up.) */ | |
3517 | ||
3518 | host_build_sender_fullhost(); /* Rebuild */ | |
3519 | set_process_info("handling%s incoming connection from %s", | |
817d9f57 | 3520 | (tls_in.active >= 0)? " TLS" : "", host_and_ident(FALSE)); |
059ec3d9 PH |
3521 | |
3522 | /* Verify if configured. This doesn't give much security, but it does | |
d7b47fd0 PH |
3523 | make some people happy to be able to do it. If helo_required is set, |
3524 | (host matches helo_verify_hosts) failure forces rejection. If helo_verify | |
3525 | is set (host matches helo_try_verify_hosts), it does not. This is perhaps | |
3526 | now obsolescent, since the verification can now be requested selectively | |
3527 | at ACL time. */ | |
059ec3d9 | 3528 | |
1705dd20 | 3529 | helo_verified = helo_verify_failed = sender_helo_dnssec = FALSE; |
059ec3d9 PH |
3530 | if (helo_required || helo_verify) |
3531 | { | |
d7b47fd0 | 3532 | BOOL tempfail = !smtp_verify_helo(); |
059ec3d9 PH |
3533 | if (!helo_verified) |
3534 | { | |
3535 | if (helo_required) | |
3536 | { | |
3537 | smtp_printf("%d %s argument does not match calling host\r\n", | |
3538 | tempfail? 451 : 550, hello); | |
3539 | log_write(0, LOG_MAIN|LOG_REJECT, "%srejected \"%s %s\" from %s", | |
3540 | tempfail? "temporarily " : "", | |
3541 | hello, sender_helo_name, host_and_ident(FALSE)); | |
3542 | helo_verified = old_helo_verified; | |
3543 | break; /* End of HELO/EHLO processing */ | |
3544 | } | |
3545 | HDEBUG(D_all) debug_printf("%s verification failed but host is in " | |
3546 | "helo_try_verify_hosts\n", hello); | |
3547 | } | |
3548 | } | |
3549 | } | |
3550 | ||
8523533c TK |
3551 | #ifdef EXPERIMENTAL_SPF |
3552 | /* set up SPF context */ | |
3553 | spf_init(sender_helo_name, sender_host_address); | |
3554 | #endif | |
3555 | ||
a14e5636 PH |
3556 | /* Apply an ACL check if one is defined; afterwards, recheck |
3557 | synchronization in case the client started sending in a delay. */ | |
059ec3d9 PH |
3558 | |
3559 | if (acl_smtp_helo != NULL) | |
3560 | { | |
64ffc24f | 3561 | rc = acl_check(ACL_WHERE_HELO, NULL, acl_smtp_helo, &user_msg, &log_msg); |
059ec3d9 PH |
3562 | if (rc != OK) |
3563 | { | |
3564 | done = smtp_handle_acl_fail(ACL_WHERE_HELO, rc, user_msg, log_msg); | |
3565 | sender_helo_name = NULL; | |
3566 | host_build_sender_fullhost(); /* Rebuild */ | |
3567 | break; | |
3568 | } | |
a14e5636 | 3569 | else if (!check_sync()) goto SYNC_FAILURE; |
059ec3d9 PH |
3570 | } |
3571 | ||
4e88a19f PH |
3572 | /* Generate an OK reply. The default string includes the ident if present, |
3573 | and also the IP address if present. Reflecting back the ident is intended | |
3574 | as a deterrent to mail forgers. For maximum efficiency, and also because | |
3575 | some broken systems expect each response to be in a single packet, arrange | |
3576 | that the entire reply is sent in one write(). */ | |
059ec3d9 PH |
3577 | |
3578 | auth_advertised = FALSE; | |
3579 | pipelining_advertised = FALSE; | |
d1a13eea | 3580 | #ifdef SUPPORT_TLS |
059ec3d9 | 3581 | tls_advertised = FALSE; |
d1a13eea | 3582 | #endif |
6c1c3d1d | 3583 | dsn_advertised = FALSE; |
d1a13eea JH |
3584 | #ifdef EXPERIMENTAL_INTERNATIONAL |
3585 | smtputf8_advertised = FALSE; | |
3586 | #endif | |
059ec3d9 | 3587 | |
d6a96edc | 3588 | smtp_code = US"250 "; /* Default response code plus space*/ |
4e88a19f PH |
3589 | if (user_msg == NULL) |
3590 | { | |
3591 | s = string_sprintf("%.3s %s Hello %s%s%s", | |
3592 | smtp_code, | |
3593 | smtp_active_hostname, | |
3594 | (sender_ident == NULL)? US"" : sender_ident, | |
3595 | (sender_ident == NULL)? US"" : US" at ", | |
3596 | (sender_host_name == NULL)? sender_helo_name : sender_host_name); | |
3597 | ||
3598 | ptr = Ustrlen(s); | |
3599 | size = ptr + 1; | |
059ec3d9 | 3600 | |
4e88a19f PH |
3601 | if (sender_host_address != NULL) |
3602 | { | |
3603 | s = string_cat(s, &size, &ptr, US" [", 2); | |
3604 | s = string_cat(s, &size, &ptr, sender_host_address, | |
3605 | Ustrlen(sender_host_address)); | |
3606 | s = string_cat(s, &size, &ptr, US"]", 1); | |
3607 | } | |
3608 | } | |
3609 | ||
d6a96edc PH |
3610 | /* A user-supplied EHLO greeting may not contain more than one line. Note |
3611 | that the code returned by smtp_message_code() includes the terminating | |
3612 | whitespace character. */ | |
059ec3d9 | 3613 | |
4e88a19f | 3614 | else |
059ec3d9 | 3615 | { |
4e88a19f | 3616 | char *ss; |
d6a96edc | 3617 | int codelen = 4; |
4e88a19f | 3618 | smtp_message_code(&smtp_code, &codelen, &user_msg, NULL); |
d6a96edc | 3619 | s = string_sprintf("%.*s%s", codelen, smtp_code, user_msg); |
4e88a19f PH |
3620 | if ((ss = strpbrk(CS s, "\r\n")) != NULL) |
3621 | { | |
3622 | log_write(0, LOG_MAIN|LOG_PANIC, "EHLO/HELO response must not contain " | |
3623 | "newlines: message truncated: %s", string_printing(s)); | |
3624 | *ss = 0; | |
3625 | } | |
3626 | ptr = Ustrlen(s); | |
3627 | size = ptr + 1; | |
059ec3d9 PH |
3628 | } |
3629 | ||
3630 | s = string_cat(s, &size, &ptr, US"\r\n", 2); | |
3631 | ||
3632 | /* If we received EHLO, we must create a multiline response which includes | |
3633 | the functions supported. */ | |
3634 | ||
3635 | if (esmtp) | |
3636 | { | |
3637 | s[3] = '-'; | |
3638 | ||
3639 | /* I'm not entirely happy with this, as an MTA is supposed to check | |
3640 | that it has enough room to accept a message of maximum size before | |
3641 | it sends this. However, there seems little point in not sending it. | |
3642 | The actual size check happens later at MAIL FROM time. By postponing it | |
3643 | till then, VRFY and EXPN can be used after EHLO when space is short. */ | |
3644 | ||
3645 | if (thismessage_size_limit > 0) | |
3646 | { | |
4e88a19f PH |
3647 | sprintf(CS big_buffer, "%.3s-SIZE %d\r\n", smtp_code, |
3648 | thismessage_size_limit); | |
059ec3d9 PH |
3649 | s = string_cat(s, &size, &ptr, big_buffer, Ustrlen(big_buffer)); |
3650 | } | |
3651 | else | |
3652 | { | |
4e88a19f PH |
3653 | s = string_cat(s, &size, &ptr, smtp_code, 3); |
3654 | s = string_cat(s, &size, &ptr, US"-SIZE\r\n", 7); | |
059ec3d9 PH |
3655 | } |
3656 | ||
3657 | /* Exim does not do protocol conversion or data conversion. It is 8-bit | |
3658 | clean; if it has an 8-bit character in its hand, it just sends it. It | |
3659 | cannot therefore specify 8BITMIME and remain consistent with the RFCs. | |
3660 | However, some users want this option simply in order to stop MUAs | |
3661 | mangling messages that contain top-bit-set characters. It is therefore | |
3662 | provided as an option. */ | |
3663 | ||
3664 | if (accept_8bitmime) | |
4e88a19f PH |
3665 | { |
3666 | s = string_cat(s, &size, &ptr, smtp_code, 3); | |
3667 | s = string_cat(s, &size, &ptr, US"-8BITMIME\r\n", 11); | |
3668 | } | |
059ec3d9 | 3669 | |
6c1c3d1d WB |
3670 | /* Advertise DSN support if configured to do so. */ |
3671 | if (verify_check_host(&dsn_advertise_hosts) != FAIL) | |
3672 | { | |
3673 | s = string_cat(s, &size, &ptr, smtp_code, 3); | |
3674 | s = string_cat(s, &size, &ptr, US"-DSN\r\n", 6); | |
3675 | dsn_advertised = TRUE; | |
3676 | } | |
6c1c3d1d | 3677 | |
059ec3d9 PH |
3678 | /* Advertise ETRN if there's an ACL checking whether a host is |
3679 | permitted to issue it; a check is made when any host actually tries. */ | |
3680 | ||
3681 | if (acl_smtp_etrn != NULL) | |
3682 | { | |
4e88a19f PH |
3683 | s = string_cat(s, &size, &ptr, smtp_code, 3); |
3684 | s = string_cat(s, &size, &ptr, US"-ETRN\r\n", 7); | |
059ec3d9 PH |
3685 | } |
3686 | ||
3687 | /* Advertise EXPN if there's an ACL checking whether a host is | |
3688 | permitted to issue it; a check is made when any host actually tries. */ | |
3689 | ||
3690 | if (acl_smtp_expn != NULL) | |
3691 | { | |
4e88a19f PH |
3692 | s = string_cat(s, &size, &ptr, smtp_code, 3); |
3693 | s = string_cat(s, &size, &ptr, US"-EXPN\r\n", 7); | |
059ec3d9 PH |
3694 | } |
3695 | ||
3696 | /* Exim is quite happy with pipelining, so let the other end know that | |
3697 | it is safe to use it, unless advertising is disabled. */ | |
3698 | ||
cf8b11a5 PH |
3699 | if (pipelining_enable && |
3700 | verify_check_host(&pipelining_advertise_hosts) == OK) | |
059ec3d9 | 3701 | { |
4e88a19f PH |
3702 | s = string_cat(s, &size, &ptr, smtp_code, 3); |
3703 | s = string_cat(s, &size, &ptr, US"-PIPELINING\r\n", 13); | |
059ec3d9 PH |
3704 | sync_cmd_limit = NON_SYNC_CMD_PIPELINING; |
3705 | pipelining_advertised = TRUE; | |
3706 | } | |
3707 | ||
fd98a5c6 | 3708 | |
059ec3d9 PH |
3709 | /* If any server authentication mechanisms are configured, advertise |
3710 | them if the current host is in auth_advertise_hosts. The problem with | |
3711 | advertising always is that some clients then require users to | |
3712 | authenticate (and aren't configurable otherwise) even though it may not | |
3713 | be necessary (e.g. if the host is in host_accept_relay). | |
3714 | ||
3715 | RFC 2222 states that SASL mechanism names contain only upper case | |
3716 | letters, so output the names in upper case, though we actually recognize | |
3717 | them in either case in the AUTH command. */ | |
3718 | ||
b3ef41c9 JH |
3719 | if ( auths |
3720 | #if defined(SUPPORT_TLS) && defined(AUTH_TLS) | |
3721 | && !sender_host_authenticated | |
3722 | #endif | |
3723 | && verify_check_host(&auth_advertise_hosts) == OK | |
3724 | ) | |
3725 | { | |
3726 | auth_instance *au; | |
3727 | BOOL first = TRUE; | |
3728 | for (au = auths; au; au = au->next) | |
3729 | if (au->server && (au->advertise_condition == NULL || | |
3730 | expand_check_condition(au->advertise_condition, au->name, | |
3731 | US"authenticator"))) | |
3732 | { | |
3733 | int saveptr; | |
3734 | if (first) | |
3735 | { | |
3736 | s = string_cat(s, &size, &ptr, smtp_code, 3); | |
3737 | s = string_cat(s, &size, &ptr, US"-AUTH", 5); | |
3738 | first = FALSE; | |
3739 | auth_advertised = TRUE; | |
3740 | } | |
3741 | saveptr = ptr; | |
3742 | s = string_cat(s, &size, &ptr, US" ", 1); | |
3743 | s = string_cat(s, &size, &ptr, au->public_name, | |
3744 | Ustrlen(au->public_name)); | |
3745 | while (++saveptr < ptr) s[saveptr] = toupper(s[saveptr]); | |
3746 | au->advertised = TRUE; | |
3747 | } | |
3748 | else | |
3749 | au->advertised = FALSE; | |
3750 | ||
3751 | if (!first) s = string_cat(s, &size, &ptr, US"\r\n", 2); | |
3752 | } | |
059ec3d9 PH |
3753 | |
3754 | /* Advertise TLS (Transport Level Security) aka SSL (Secure Socket Layer) | |
3755 | if it has been included in the binary, and the host matches | |
3756 | tls_advertise_hosts. We must *not* advertise if we are already in a | |
3757 | secure connection. */ | |
3758 | ||
d1a13eea | 3759 | #ifdef SUPPORT_TLS |
817d9f57 | 3760 | if (tls_in.active < 0 && |
059ec3d9 PH |
3761 | verify_check_host(&tls_advertise_hosts) != FAIL) |
3762 | { | |
4e88a19f PH |
3763 | s = string_cat(s, &size, &ptr, smtp_code, 3); |
3764 | s = string_cat(s, &size, &ptr, US"-STARTTLS\r\n", 11); | |
059ec3d9 PH |
3765 | tls_advertised = TRUE; |
3766 | } | |
d1a13eea | 3767 | #endif |
059ec3d9 | 3768 | |
d1a13eea | 3769 | #ifndef DISABLE_PRDR |
fd98a5c6 | 3770 | /* Per Recipient Data Response, draft by Eric A. Hall extending RFC */ |
8ccd00b1 JH |
3771 | if (prdr_enable) |
3772 | { | |
fd98a5c6 JH |
3773 | s = string_cat(s, &size, &ptr, smtp_code, 3); |
3774 | s = string_cat(s, &size, &ptr, US"-PRDR\r\n", 7); | |
8ccd00b1 | 3775 | } |
d1a13eea JH |
3776 | #endif |
3777 | ||
3778 | #ifdef EXPERIMENTAL_INTERNATIONAL | |
3779 | if ( accept_8bitmime | |
3780 | && verify_check_host(&smtputf8_advertise_hosts) != FAIL) | |
3781 | { | |
3782 | s = string_cat(s, &size, &ptr, smtp_code, 3); | |
3783 | s = string_cat(s, &size, &ptr, US"-SMTPUTF8\r\n", 11); | |
3784 | smtputf8_advertised = TRUE; | |
3785 | } | |
3786 | #endif | |
fd98a5c6 | 3787 | |
059ec3d9 PH |
3788 | /* Finish off the multiline reply with one that is always available. */ |
3789 | ||
4e88a19f PH |
3790 | s = string_cat(s, &size, &ptr, smtp_code, 3); |
3791 | s = string_cat(s, &size, &ptr, US" HELP\r\n", 7); | |
059ec3d9 PH |
3792 | } |
3793 | ||
3794 | /* Terminate the string (for debug), write it, and note that HELO/EHLO | |
3795 | has been seen. */ | |
3796 | ||
3797 | s[ptr] = 0; | |
3798 | ||
d1a13eea | 3799 | #ifdef SUPPORT_TLS |
817d9f57 | 3800 | if (tls_in.active >= 0) (void)tls_write(TRUE, s, ptr); else |
d1a13eea | 3801 | #endif |
059ec3d9 | 3802 | |
1ac6b2e7 JH |
3803 | { |
3804 | int i = fwrite(s, 1, ptr, smtp_out); i = i; /* compiler quietening */ | |
3805 | } | |
898d150f PH |
3806 | DEBUG(D_receive) |
3807 | { | |
3808 | uschar *cr; | |
3809 | while ((cr = Ustrchr(s, '\r')) != NULL) /* lose CRs */ | |
3810 | memmove(cr, cr + 1, (ptr--) - (cr - s)); | |
3811 | debug_printf("SMTP>> %s", s); | |
3812 | } | |
059ec3d9 | 3813 | helo_seen = TRUE; |
4e88a19f PH |
3814 | |
3815 | /* Reset the protocol and the state, abandoning any previous message. */ | |
e524074d JH |
3816 | received_protocol = |
3817 | (sender_host_address ? protocols : protocols_local) | |
3818 | [ (esmtp | |
3819 | ? pextend + (sender_host_authenticated ? pauthed : 0) | |
3820 | : pnormal) | |
3821 | + (tls_in.active >= 0 ? pcrpted : 0) | |
3822 | ]; | |
4e88a19f PH |
3823 | smtp_reset(reset_point); |
3824 | toomany = FALSE; | |
059ec3d9 PH |
3825 | break; /* HELO/EHLO */ |
3826 | ||
3827 | ||
3828 | /* The MAIL command requires an address as an operand. All we do | |
3829 | here is to parse it for syntactic correctness. The form "<>" is | |
3830 | a special case which converts into an empty string. The start/end | |
3831 | pointers in the original are not used further for this address, as | |
3832 | it is the canonical extracted address which is all that is kept. */ | |
3833 | ||
3834 | case MAIL_CMD: | |
b4ed4da0 | 3835 | HAD(SCH_MAIL); |
059ec3d9 PH |
3836 | smtp_mailcmd_count++; /* Count for limit and ratelimit */ |
3837 | was_rej_mail = TRUE; /* Reset if accepted */ | |
d27f98fe | 3838 | env_mail_type_t * mail_args; /* Sanity check & validate args */ |
059ec3d9 PH |
3839 | |
3840 | if (helo_required && !helo_seen) | |
3841 | { | |
3842 | smtp_printf("503 HELO or EHLO required\r\n"); | |
3843 | log_write(0, LOG_MAIN|LOG_REJECT, "rejected MAIL from %s: no " | |
3844 | "HELO/EHLO given", host_and_ident(FALSE)); | |
3845 | break; | |
3846 | } | |
3847 | ||
3848 | if (sender_address != NULL) | |
3849 | { | |
3850 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
3851 | US"sender already given"); | |
3852 | break; | |
3853 | } | |
3854 | ||
ca86f471 | 3855 | if (smtp_cmd_data[0] == 0) |
059ec3d9 PH |
3856 | { |
3857 | done = synprot_error(L_smtp_protocol_error, 501, NULL, | |
3858 | US"MAIL must have an address operand"); | |
3859 | break; | |
3860 | } | |
3861 | ||
3862 | /* Check to see if the limit for messages per connection would be | |
3863 | exceeded by accepting further messages. */ | |
3864 | ||
3865 | if (smtp_accept_max_per_connection > 0 && | |
3866 | smtp_mailcmd_count > smtp_accept_max_per_connection) | |
3867 | { | |
3868 | smtp_printf("421 too many messages in this connection\r\n"); | |
3869 | log_write(0, LOG_MAIN|LOG_REJECT, "rejected MAIL command %s: too many " | |
3870 | "messages in one connection", host_and_ident(TRUE)); | |
3871 | break; | |
3872 | } | |
3873 | ||
3874 | /* Reset for start of message - even if this is going to fail, we | |
3875 | obviously need to throw away any previous data. */ | |
3876 | ||
3877 | smtp_reset(reset_point); | |
3878 | toomany = FALSE; | |
3879 | sender_data = recipient_data = NULL; | |
3880 | ||
3881 | /* Loop, checking for ESMTP additions to the MAIL FROM command. */ | |
3882 | ||
3883 | if (esmtp) for(;;) | |
3884 | { | |
3885 | uschar *name, *value, *end; | |
3886 | unsigned long int size; | |
d27f98fe | 3887 | BOOL arg_error = FALSE; |
059ec3d9 PH |
3888 | |
3889 | if (!extract_option(&name, &value)) break; | |
3890 | ||
d27f98fe | 3891 | for (mail_args = env_mail_type_list; |
2ef7ed08 | 3892 | mail_args->value != ENV_MAIL_OPT_NULL; |
d27f98fe TL |
3893 | mail_args++ |
3894 | ) | |
d27f98fe TL |
3895 | if (strcmpic(name, mail_args->name) == 0) |
3896 | break; | |
d27f98fe TL |
3897 | if (mail_args->need_value && strcmpic(value, US"") == 0) |
3898 | break; | |
059ec3d9 | 3899 | |
d27f98fe | 3900 | switch(mail_args->value) |
059ec3d9 | 3901 | { |
d27f98fe TL |
3902 | /* Handle SIZE= by reading the value. We don't do the check till later, |
3903 | in order to be able to log the sender address on failure. */ | |
3904 | case ENV_MAIL_OPT_SIZE: | |
d27f98fe | 3905 | if (((size = Ustrtoul(value, &end, 10)), *end == 0)) |
059ec3d9 | 3906 | { |
d27f98fe TL |
3907 | if ((size == ULONG_MAX && errno == ERANGE) || size > INT_MAX) |
3908 | size = INT_MAX; | |
3909 | message_size = (int)size; | |
059ec3d9 PH |
3910 | } |
3911 | else | |
d27f98fe TL |
3912 | arg_error = TRUE; |
3913 | break; | |
059ec3d9 | 3914 | |
d27f98fe TL |
3915 | /* If this session was initiated with EHLO and accept_8bitmime is set, |
3916 | Exim will have indicated that it supports the BODY=8BITMIME option. In | |
3917 | fact, it does not support this according to the RFCs, in that it does not | |
3918 | take any special action for forwarding messages containing 8-bit | |
3919 | characters. That is why accept_8bitmime is not the default setting, but | |
3920 | some sites want the action that is provided. We recognize both "8BITMIME" | |
3921 | and "7BIT" as body types, but take no action. */ | |
3922 | case ENV_MAIL_OPT_BODY: | |
3c0a92dc | 3923 | if (accept_8bitmime) { |
9d4319df | 3924 | if (strcmpic(value, US"8BITMIME") == 0) |
3c0a92dc | 3925 | body_8bitmime = 8; |
9d4319df | 3926 | else if (strcmpic(value, US"7BIT") == 0) |
3c0a92dc | 3927 | body_8bitmime = 7; |
9d4319df JH |
3928 | else |
3929 | { | |
3c0a92dc JH |
3930 | body_8bitmime = 0; |
3931 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
3932 | US"invalid data for BODY"); | |
3933 | goto COMMAND_LOOP; | |
9d4319df | 3934 | } |
3c0a92dc JH |
3935 | DEBUG(D_receive) debug_printf("8BITMIME: %d\n", body_8bitmime); |
3936 | break; | |
3937 | } | |
d27f98fe TL |
3938 | arg_error = TRUE; |
3939 | break; | |
059ec3d9 | 3940 | |
6c1c3d1d WB |
3941 | /* Handle the two DSN options, but only if configured to do so (which |
3942 | will have caused "DSN" to be given in the EHLO response). The code itself | |
3943 | is included only if configured in at build time. */ | |
3944 | ||
3945 | case ENV_MAIL_OPT_RET: | |
9d4319df JH |
3946 | if (dsn_advertised) |
3947 | { | |
6c1c3d1d | 3948 | /* Check if RET has already been set */ |
9d4319df JH |
3949 | if (dsn_ret > 0) |
3950 | { | |
6c1c3d1d WB |
3951 | synprot_error(L_smtp_syntax_error, 501, NULL, |
3952 | US"RET can be specified once only"); | |
3953 | goto COMMAND_LOOP; | |
9d4319df JH |
3954 | } |
3955 | dsn_ret = strcmpic(value, US"HDRS") == 0 | |
3956 | ? dsn_ret_hdrs | |
3957 | : strcmpic(value, US"FULL") == 0 | |
3958 | ? dsn_ret_full | |
3959 | : 0; | |
6c1c3d1d WB |
3960 | DEBUG(D_receive) debug_printf("DSN_RET: %d\n", dsn_ret); |
3961 | /* Check for invalid invalid value, and exit with error */ | |
9d4319df JH |
3962 | if (dsn_ret == 0) |
3963 | { | |
6c1c3d1d WB |
3964 | synprot_error(L_smtp_syntax_error, 501, NULL, |
3965 | US"Value for RET is invalid"); | |
3966 | goto COMMAND_LOOP; | |
9d4319df JH |
3967 | } |
3968 | } | |
6c1c3d1d WB |
3969 | break; |
3970 | case ENV_MAIL_OPT_ENVID: | |
9d4319df JH |
3971 | if (dsn_advertised) |
3972 | { | |
6c1c3d1d | 3973 | /* Check if the dsn envid has been already set */ |
9d4319df JH |
3974 | if (dsn_envid != NULL) |
3975 | { | |
6c1c3d1d WB |
3976 | synprot_error(L_smtp_syntax_error, 501, NULL, |
3977 | US"ENVID can be specified once only"); | |
3978 | goto COMMAND_LOOP; | |
9d4319df | 3979 | } |
6c1c3d1d WB |
3980 | dsn_envid = string_copy(value); |
3981 | DEBUG(D_receive) debug_printf("DSN_ENVID: %s\n", dsn_envid); | |
9d4319df | 3982 | } |
6c1c3d1d | 3983 | break; |
6c1c3d1d | 3984 | |
d27f98fe TL |
3985 | /* Handle the AUTH extension. If the value given is not "<>" and either |
3986 | the ACL says "yes" or there is no ACL but the sending host is | |
3987 | authenticated, we set it up as the authenticated sender. However, if the | |
3988 | authenticator set a condition to be tested, we ignore AUTH on MAIL unless | |
3989 | the condition is met. The value of AUTH is an xtext, which means that +, | |
3990 | = and cntrl chars are coded in hex; however "<>" is unaffected by this | |
3991 | coding. */ | |
3992 | case ENV_MAIL_OPT_AUTH: | |
3993 | if (Ustrcmp(value, "<>") != 0) | |
3994 | { | |
3995 | int rc; | |
3996 | uschar *ignore_msg; | |
059ec3d9 | 3997 | |
d27f98fe TL |
3998 | if (auth_xtextdecode(value, &authenticated_sender) < 0) |
3999 | { | |
4000 | /* Put back terminator overrides for error message */ | |
d27f98fe | 4001 | value[-1] = '='; |
fd98a5c6 | 4002 | name[-1] = ' '; |
d27f98fe TL |
4003 | done = synprot_error(L_smtp_syntax_error, 501, NULL, |
4004 | US"invalid data for AUTH"); | |
4005 | goto COMMAND_LOOP; | |
4006 | } | |
4007 | if (acl_smtp_mailauth == NULL) | |
4008 | { | |
4009 | ignore_msg = US"client not authenticated"; | |
4010 | rc = (sender_host_authenticated != NULL)? OK : FAIL; | |
4011 | } | |
4012 | else | |
4013 | { | |
4014 | ignore_msg = US"rejected by ACL"; | |
4015 | rc = acl_check(ACL_WHERE_MAILAUTH, NULL, acl_smtp_mailauth, | |
4016 | &user_msg, &log_msg); | |
4017 | } | |
4018 | ||
4019 | switch (rc) | |
4020 | { | |
4021 | case OK: | |
9d4319df JH |
4022 | if (authenticated_by == NULL || |
4023 | authenticated_by->mail_auth_condition == NULL || | |
4024 | expand_check_condition(authenticated_by->mail_auth_condition, | |
4025 | authenticated_by->name, US"authenticator")) | |
4026 | break; /* Accept the AUTH */ | |
e524074d | 4027 | |
9d4319df JH |
4028 | ignore_msg = US"server_mail_auth_condition failed"; |
4029 | if (authenticated_id != NULL) | |
4030 | ignore_msg = string_sprintf("%s: authenticated ID=\"%s\"", | |
4031 | ignore_msg, authenticated_id); | |
d27f98fe TL |
4032 | |
4033 | /* Fall through */ | |
4034 | ||
4035 | case FAIL: | |
9d4319df JH |
4036 | authenticated_sender = NULL; |
4037 | log_write(0, LOG_MAIN, "ignoring AUTH=%s from %s (%s)", | |
4038 | value, host_and_ident(TRUE), ignore_msg); | |
4039 | break; | |
d27f98fe TL |
4040 | |
4041 | /* Should only get DEFER or ERROR here. Put back terminator | |
4042 | overrides for error message */ | |
4043 | ||
4044 | default: | |
9d4319df JH |
4045 | value[-1] = '='; |
4046 | name[-1] = ' '; | |
4047 | (void)smtp_handle_acl_fail(ACL_WHERE_MAILAUTH, rc, user_msg, | |
4048 | log_msg); | |
4049 | goto COMMAND_LOOP; | |
d27f98fe | 4050 | } |
059ec3d9 | 4051 | } |
d27f98fe | 4052 | break; |
fd98a5c6 | 4053 | |
8ccd00b1 | 4054 | #ifndef DISABLE_PRDR |
fd98a5c6 | 4055 | case ENV_MAIL_OPT_PRDR: |
8ccd00b1 | 4056 | if (prdr_enable) |
fd98a5c6 JH |
4057 | prdr_requested = TRUE; |
4058 | break; | |
4059 | #endif | |
4060 | ||
d1a13eea JH |
4061 | #ifdef EXPERIMENTAL_INTERNATIONAL |
4062 | case ENV_MAIL_OPT_UTF8: | |
4063 | if (smtputf8_advertised) | |
e524074d JH |
4064 | { |
4065 | DEBUG(D_receive) debug_printf("smtputf8 requested\n"); | |
9d4319df | 4066 | message_smtputf8 = allow_utf8_domains = TRUE; |
5a886ce7 | 4067 | received_protocol = string_sprintf("utf8%s", received_protocol); |
e524074d | 4068 | } |
d1a13eea JH |
4069 | break; |
4070 | #endif | |
2ef7ed08 | 4071 | /* No valid option. Stick back the terminator characters and break |
fd98a5c6 | 4072 | the loop. Do the name-terminator second as extract_option sets |
2ef7ed08 HSHR |
4073 | value==name when it found no equal-sign. |
4074 | An error for a malformed address will occur. */ | |
4075 | case ENV_MAIL_OPT_NULL: | |
d27f98fe | 4076 | value[-1] = '='; |
fd98a5c6 JH |
4077 | name[-1] = ' '; |
4078 | arg_error = TRUE; | |
d27f98fe | 4079 | break; |
2ef7ed08 HSHR |
4080 | |
4081 | default: assert(0); | |
059ec3d9 | 4082 | } |
d27f98fe TL |
4083 | /* Break out of for loop if switch() had bad argument or |
4084 | when start of the email address is reached */ | |
4085 | if (arg_error) break; | |
059ec3d9 PH |
4086 | } |
4087 | ||
4088 | /* If we have passed the threshold for rate limiting, apply the current | |
4089 | delay, and update it for next time, provided this is a limited host. */ | |
4090 | ||
4091 | if (smtp_mailcmd_count > smtp_rlm_threshold && | |
4092 | verify_check_host(&smtp_ratelimit_hosts) == OK) | |
4093 | { | |
4094 | DEBUG(D_receive) debug_printf("rate limit MAIL: delay %.3g sec\n", | |
4095 | smtp_delay_mail/1000.0); | |
4096 | millisleep((int)smtp_delay_mail); | |
4097 | smtp_delay_mail *= smtp_rlm_factor; | |
4098 | if (smtp_delay_mail > (double)smtp_rlm_limit) | |
4099 | smtp_delay_mail = (double)smtp_rlm_limit; | |
4100 | } | |
4101 | ||
4102 | /* Now extract the address, first applying any SMTP-time rewriting. The | |
4103 | TRUE flag allows "<>" as a sender address. */ | |
4104 | ||
9d4319df JH |
4105 | raw_sender = rewrite_existflags & rewrite_smtp |
4106 | ? rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"", | |
4107 | global_rewrite_rules) | |
4108 | : smtp_cmd_data; | |
059ec3d9 PH |
4109 | |
4110 | /* rfc821_domains = TRUE; << no longer needed */ | |
4111 | raw_sender = | |
4112 | parse_extract_address(raw_sender, &errmess, &start, &end, &sender_domain, | |
4113 | TRUE); | |
4114 | /* rfc821_domains = FALSE; << no longer needed */ | |
4115 | ||
4116 | if (raw_sender == NULL) | |
4117 | { | |
ca86f471 | 4118 | done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess); |
059ec3d9 PH |
4119 | break; |
4120 | } | |
4121 | ||
4122 | sender_address = raw_sender; | |
4123 | ||
4124 | /* If there is a configured size limit for mail, check that this message | |
4125 | doesn't exceed it. The check is postponed to this point so that the sender | |
4126 | can be logged. */ | |
4127 | ||
4128 | if (thismessage_size_limit > 0 && message_size > thismessage_size_limit) | |
4129 | { | |
4130 | smtp_printf("552 Message size exceeds maximum permitted\r\n"); | |
4131 | log_write(L_size_reject, | |
4132 | LOG_MAIN|LOG_REJECT, "rejected MAIL FROM:<%s> %s: " | |
4133 | "message too big: size%s=%d max=%d", | |
4134 | sender_address, | |
4135 | host_and_ident(TRUE), | |
4136 | (message_size == INT_MAX)? ">" : "", | |
4137 | message_size, | |
4138 | thismessage_size_limit); | |
4139 | sender_address = NULL; | |
4140 | break; | |
4141 | } | |
4142 | ||
4143 | /* Check there is enough space on the disk unless configured not to. | |
4144 | When smtp_check_spool_space is set, the check is for thismessage_size_limit | |
4145 | plus the current message - i.e. we accept the message only if it won't | |
4146 | reduce the space below the threshold. Add 5000 to the size to allow for | |
4147 | overheads such as the Received: line and storing of recipients, etc. | |
4148 | By putting the check here, even when SIZE is not given, it allow VRFY | |
4149 | and EXPN etc. to be used when space is short. */ | |
4150 | ||
4151 | if (!receive_check_fs( | |
4152 | (smtp_check_spool_space && message_size >= 0)? | |
4153 | message_size + 5000 : 0)) | |
4154 | { | |
4155 | smtp_printf("452 Space shortage, please try later\r\n"); | |
4156 | sender_address = NULL; | |
4157 | break; | |
4158 | } | |
4159 | ||
4160 | /* If sender_address is unqualified, reject it, unless this is a locally | |
4161 | generated message, or the sending host or net is permitted to send | |
4162 | unqualified addresses - typically local machines behaving as MUAs - | |
4163 | in which case just qualify the address. The flag is set above at the start | |
4164 | of the SMTP connection. */ | |
4165 | ||
4166 | if (sender_domain == 0 && sender_address[0] != 0) | |
4167 | { | |
4168 | if (allow_unqualified_sender) | |
4169 | { | |
4170 | sender_domain = Ustrlen(sender_address) + 1; | |
4171 | sender_address = rewrite_address_qualify(sender_address, FALSE); | |
4172 | DEBUG(D_receive) debug_printf("unqualified address %s accepted\n", | |
4173 | raw_sender); | |
4174 | } | |
4175 | else | |
4176 | { | |
4177 | smtp_printf("501 %s: sender address must contain a domain\r\n", | |
ca86f471 | 4178 | smtp_cmd_data); |
059ec3d9 PH |
4179 | log_write(L_smtp_syntax_error, |
4180 | LOG_MAIN|LOG_REJECT, | |
4181 | "unqualified sender rejected: <%s> %s%s", | |
4182 | raw_sender, | |
4183 | host_and_ident(TRUE), | |
4184 | host_lookup_msg); | |
4185 | sender_address = NULL; | |
4186 | break; | |
4187 | } | |
4188 | } | |
4189 | ||
a14e5636 PH |
4190 | /* Apply an ACL check if one is defined, before responding. Afterwards, |
4191 | when pipelining is not advertised, do another sync check in case the ACL | |
4192 | delayed and the client started sending in the meantime. */ | |
059ec3d9 | 4193 | |
8ccd00b1 | 4194 | if (acl_smtp_mail) |
a14e5636 PH |
4195 | { |
4196 | rc = acl_check(ACL_WHERE_MAIL, NULL, acl_smtp_mail, &user_msg, &log_msg); | |
4197 | if (rc == OK && !pipelining_advertised && !check_sync()) | |
4198 | goto SYNC_FAILURE; | |
4199 | } | |
8ccd00b1 JH |
4200 | else |
4201 | rc = OK; | |
059ec3d9 PH |
4202 | |
4203 | if (rc == OK || rc == DISCARD) | |
4204 | { | |
8ccd00b1 | 4205 | if (!user_msg) |
fd98a5c6 | 4206 | smtp_printf("%s%s%s", US"250 OK", |
8ccd00b1 JH |
4207 | #ifndef DISABLE_PRDR |
4208 | prdr_requested ? US", PRDR Requested" : US"", | |
4209 | #else | |
fd98a5c6 | 4210 | US"", |
8ccd00b1 | 4211 | #endif |
fd98a5c6 JH |
4212 | US"\r\n"); |
4213 | else | |
4214 | { | |
8ccd00b1 JH |
4215 | #ifndef DISABLE_PRDR |
4216 | if (prdr_requested) | |
fd98a5c6 JH |
4217 | user_msg = string_sprintf("%s%s", user_msg, US", PRDR Requested"); |
4218 | #endif | |
8ccd00b1 | 4219 | smtp_user_msg(US"250", user_msg); |
fd98a5c6 | 4220 | } |
059ec3d9 PH |
4221 | smtp_delay_rcpt = smtp_rlr_base; |
4222 | recipients_discarded = (rc == DISCARD); | |
4223 | was_rej_mail = FALSE; | |
4224 | } | |
059ec3d9 PH |
4225 | else |
4226 | { | |
4227 | done = smtp_handle_acl_fail(ACL_WHERE_MAIL, rc, user_msg, log_msg); | |
4228 | sender_address = NULL; | |
4229 | } | |
4230 | break; | |
4231 | ||
4232 | ||
2679d413 PH |
4233 | /* The RCPT command requires an address as an operand. There may be any |
4234 | number of RCPT commands, specifying multiple recipients. We build them all | |
4235 | into a data structure. The start/end values given by parse_extract_address | |
4236 | are not used, as we keep only the extracted address. */ | |
059ec3d9 PH |
4237 | |
4238 | case RCPT_CMD: | |
b4ed4da0 | 4239 | HAD(SCH_RCPT); |
059ec3d9 | 4240 | rcpt_count++; |
2679d413 | 4241 | was_rcpt = rcpt_in_progress = TRUE; |
059ec3d9 PH |
4242 | |
4243 | /* There must be a sender address; if the sender was rejected and | |
4244 | pipelining was advertised, we assume the client was pipelining, and do not | |
4245 | count this as a protocol error. Reset was_rej_mail so that further RCPTs | |
4246 | get the same treatment. */ | |
4247 | ||
4248 | if (sender_address == NULL) | |
4249 | { | |
4250 | if (pipelining_advertised && last_was_rej_mail) | |
4251 | { | |
4252 | smtp_printf("503 sender not yet given\r\n"); | |
4253 | was_rej_mail = TRUE; | |
4254 | } | |
4255 | else | |
4256 | { | |
4257 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
4258 | US"sender not yet given"); | |
4259 | was_rcpt = FALSE; /* Not a valid RCPT */ | |
4260 | } | |
4261 | rcpt_fail_count++; | |
4262 | break; | |
4263 | } | |
4264 | ||
4265 | /* Check for an operand */ | |
4266 | ||
ca86f471 | 4267 | if (smtp_cmd_data[0] == 0) |
059ec3d9 PH |
4268 | { |
4269 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4270 | US"RCPT must have an address operand"); | |
4271 | rcpt_fail_count++; | |
4272 | break; | |
4273 | } | |
50dc7409 | 4274 | |
6c1c3d1d WB |
4275 | /* Set the DSN flags orcpt and dsn_flags from the session*/ |
4276 | orcpt = NULL; | |
4277 | flags = 0; | |
4278 | ||
4279 | if (esmtp) for(;;) | |
4280 | { | |
45500060 | 4281 | uschar *name, *value; |
6c1c3d1d WB |
4282 | |
4283 | if (!extract_option(&name, &value)) | |
6c1c3d1d | 4284 | break; |
6c1c3d1d WB |
4285 | |
4286 | if (dsn_advertised && strcmpic(name, US"ORCPT") == 0) | |
4287 | { | |
4288 | /* Check whether orcpt has been already set */ | |
45500060 JH |
4289 | if (orcpt) |
4290 | { | |
6c1c3d1d WB |
4291 | synprot_error(L_smtp_syntax_error, 501, NULL, |
4292 | US"ORCPT can be specified once only"); | |
4293 | goto COMMAND_LOOP; | |
4294 | } | |
4295 | orcpt = string_copy(value); | |
4296 | DEBUG(D_receive) debug_printf("DSN orcpt: %s\n", orcpt); | |
4297 | } | |
4298 | ||
4299 | else if (dsn_advertised && strcmpic(name, US"NOTIFY") == 0) | |
4300 | { | |
4301 | /* Check if the notify flags have been already set */ | |
45500060 JH |
4302 | if (flags > 0) |
4303 | { | |
6c1c3d1d WB |
4304 | synprot_error(L_smtp_syntax_error, 501, NULL, |
4305 | US"NOTIFY can be specified once only"); | |
4306 | goto COMMAND_LOOP; | |
4307 | } | |
45500060 JH |
4308 | if (strcmpic(value, US"NEVER") == 0) |
4309 | flags |= rf_notify_never; | |
4310 | else | |
6c1c3d1d WB |
4311 | { |
4312 | uschar *p = value; | |
4313 | while (*p != 0) | |
4314 | { | |
4315 | uschar *pp = p; | |
4316 | while (*pp != 0 && *pp != ',') pp++; | |
45500060 JH |
4317 | if (*pp == ',') *pp++ = 0; |
4318 | if (strcmpic(p, US"SUCCESS") == 0) | |
4319 | { | |
4320 | DEBUG(D_receive) debug_printf("DSN: Setting notify success\n"); | |
4321 | flags |= rf_notify_success; | |
6c1c3d1d | 4322 | } |
45500060 JH |
4323 | else if (strcmpic(p, US"FAILURE") == 0) |
4324 | { | |
4325 | DEBUG(D_receive) debug_printf("DSN: Setting notify failure\n"); | |
4326 | flags |= rf_notify_failure; | |
6c1c3d1d | 4327 | } |
45500060 JH |
4328 | else if (strcmpic(p, US"DELAY") == 0) |
4329 | { | |
4330 | DEBUG(D_receive) debug_printf("DSN: Setting notify delay\n"); | |
4331 | flags |= rf_notify_delay; | |
6c1c3d1d | 4332 | } |
45500060 JH |
4333 | else |
4334 | { | |
6c1c3d1d WB |
4335 | /* Catch any strange values */ |
4336 | synprot_error(L_smtp_syntax_error, 501, NULL, | |
4337 | US"Invalid value for NOTIFY parameter"); | |
4338 | goto COMMAND_LOOP; | |
4339 | } | |
4340 | p = pp; | |
4341 | } | |
4342 | DEBUG(D_receive) debug_printf("DSN Flags: %x\n", flags); | |
4343 | } | |
4344 | } | |
4345 | ||
4346 | /* Unknown option. Stick back the terminator characters and break | |
4347 | the loop. An error for a malformed address will occur. */ | |
4348 | ||
4349 | else | |
4350 | { | |
4351 | DEBUG(D_receive) debug_printf("Invalid RCPT option: %s : %s\n", name, value); | |
4352 | name[-1] = ' '; | |
4353 | value[-1] = '='; | |
4354 | break; | |
4355 | } | |
4356 | } | |
059ec3d9 PH |
4357 | |
4358 | /* Apply SMTP rewriting then extract the working address. Don't allow "<>" | |
4359 | as a recipient address */ | |
4360 | ||
4361 | recipient = ((rewrite_existflags & rewrite_smtp) != 0)? | |
ca86f471 PH |
4362 | rewrite_one(smtp_cmd_data, rewrite_smtp, NULL, FALSE, US"", |
4363 | global_rewrite_rules) : smtp_cmd_data; | |
059ec3d9 PH |
4364 | |
4365 | /* rfc821_domains = TRUE; << no longer needed */ | |
4366 | recipient = parse_extract_address(recipient, &errmess, &start, &end, | |
4367 | &recipient_domain, FALSE); | |
4368 | /* rfc821_domains = FALSE; << no longer needed */ | |
4369 | ||
4370 | if (recipient == NULL) | |
4371 | { | |
ca86f471 | 4372 | done = synprot_error(L_smtp_syntax_error, 501, smtp_cmd_data, errmess); |
059ec3d9 PH |
4373 | rcpt_fail_count++; |
4374 | break; | |
4375 | } | |
4376 | ||
4377 | /* If the recipient address is unqualified, reject it, unless this is a | |
4378 | locally generated message. However, unqualified addresses are permitted | |
4379 | from a configured list of hosts and nets - typically when behaving as | |
4380 | MUAs rather than MTAs. Sad that SMTP is used for both types of traffic, | |
4381 | really. The flag is set at the start of the SMTP connection. | |
4382 | ||
4383 | RFC 1123 talks about supporting "the reserved mailbox postmaster"; I always | |
4384 | assumed this meant "reserved local part", but the revision of RFC 821 and | |
4385 | friends now makes it absolutely clear that it means *mailbox*. Consequently | |
4386 | we must always qualify this address, regardless. */ | |
4387 | ||
4388 | if (recipient_domain == 0) | |
4389 | { | |
4390 | if (allow_unqualified_recipient || | |
4391 | strcmpic(recipient, US"postmaster") == 0) | |
4392 | { | |
4393 | DEBUG(D_receive) debug_printf("unqualified address %s accepted\n", | |
4394 | recipient); | |
4395 | recipient_domain = Ustrlen(recipient) + 1; | |
4396 | recipient = rewrite_address_qualify(recipient, TRUE); | |
4397 | } | |
4398 | else | |
4399 | { | |
4400 | rcpt_fail_count++; | |
4401 | smtp_printf("501 %s: recipient address must contain a domain\r\n", | |
ca86f471 | 4402 | smtp_cmd_data); |
059ec3d9 PH |
4403 | log_write(L_smtp_syntax_error, |
4404 | LOG_MAIN|LOG_REJECT, "unqualified recipient rejected: " | |
4405 | "<%s> %s%s", recipient, host_and_ident(TRUE), | |
4406 | host_lookup_msg); | |
4407 | break; | |
4408 | } | |
4409 | } | |
4410 | ||
4411 | /* Check maximum allowed */ | |
4412 | ||
4413 | if (rcpt_count > recipients_max && recipients_max > 0) | |
4414 | { | |
4415 | if (recipients_max_reject) | |
4416 | { | |
4417 | rcpt_fail_count++; | |
4418 | smtp_printf("552 too many recipients\r\n"); | |
4419 | if (!toomany) | |
4420 | log_write(0, LOG_MAIN|LOG_REJECT, "too many recipients: message " | |
4421 | "rejected: sender=<%s> %s", sender_address, host_and_ident(TRUE)); | |
4422 | } | |
4423 | else | |
4424 | { | |
4425 | rcpt_defer_count++; | |
4426 | smtp_printf("452 too many recipients\r\n"); | |
4427 | if (!toomany) | |
4428 | log_write(0, LOG_MAIN|LOG_REJECT, "too many recipients: excess " | |
4429 | "temporarily rejected: sender=<%s> %s", sender_address, | |
4430 | host_and_ident(TRUE)); | |
4431 | } | |
4432 | ||
4433 | toomany = TRUE; | |
4434 | break; | |
4435 | } | |
4436 | ||
4437 | /* If we have passed the threshold for rate limiting, apply the current | |
4438 | delay, and update it for next time, provided this is a limited host. */ | |
4439 | ||
4440 | if (rcpt_count > smtp_rlr_threshold && | |
4441 | verify_check_host(&smtp_ratelimit_hosts) == OK) | |
4442 | { | |
4443 | DEBUG(D_receive) debug_printf("rate limit RCPT: delay %.3g sec\n", | |
4444 | smtp_delay_rcpt/1000.0); | |
4445 | millisleep((int)smtp_delay_rcpt); | |
4446 | smtp_delay_rcpt *= smtp_rlr_factor; | |
4447 | if (smtp_delay_rcpt > (double)smtp_rlr_limit) | |
4448 | smtp_delay_rcpt = (double)smtp_rlr_limit; | |
4449 | } | |
4450 | ||
4451 | /* If the MAIL ACL discarded all the recipients, we bypass ACL checking | |
a14e5636 PH |
4452 | for them. Otherwise, check the access control list for this recipient. As |
4453 | there may be a delay in this, re-check for a synchronization error | |
4454 | afterwards, unless pipelining was advertised. */ | |
059ec3d9 | 4455 | |
a14e5636 PH |
4456 | if (recipients_discarded) rc = DISCARD; else |
4457 | { | |
4458 | rc = acl_check(ACL_WHERE_RCPT, recipient, acl_smtp_rcpt, &user_msg, | |
4459 | &log_msg); | |
4460 | if (rc == OK && !pipelining_advertised && !check_sync()) | |
4461 | goto SYNC_FAILURE; | |
4462 | } | |
059ec3d9 PH |
4463 | |
4464 | /* The ACL was happy */ | |
4465 | ||
4466 | if (rc == OK) | |
4467 | { | |
4e88a19f PH |
4468 | if (user_msg == NULL) smtp_printf("250 Accepted\r\n"); |
4469 | else smtp_user_msg(US"250", user_msg); | |
059ec3d9 | 4470 | receive_add_recipient(recipient, -1); |
50dc7409 | 4471 | |
6c1c3d1d | 4472 | /* Set the dsn flags in the recipients_list */ |
7ade712c JH |
4473 | recipients_list[recipients_count-1].orcpt = orcpt; |
4474 | recipients_list[recipients_count-1].dsn_flags = flags; | |
6c1c3d1d | 4475 | |
7ade712c JH |
4476 | DEBUG(D_receive) debug_printf("DSN: orcpt: %s flags: %d\n", |
4477 | recipients_list[recipients_count-1].orcpt, | |
4478 | recipients_list[recipients_count-1].dsn_flags); | |
059ec3d9 PH |
4479 | } |
4480 | ||
4481 | /* The recipient was discarded */ | |
4482 | ||
4483 | else if (rc == DISCARD) | |
4484 | { | |
4e88a19f PH |
4485 | if (user_msg == NULL) smtp_printf("250 Accepted\r\n"); |
4486 | else smtp_user_msg(US"250", user_msg); | |
059ec3d9 PH |
4487 | rcpt_fail_count++; |
4488 | discarded = TRUE; | |
1f12df4d | 4489 | log_write(0, LOG_MAIN|LOG_REJECT, "%s F=<%s> RCPT %s: " |
059ec3d9 | 4490 | "discarded by %s ACL%s%s", host_and_ident(TRUE), |
1f12df4d | 4491 | sender_address_unrewritten? sender_address_unrewritten : sender_address, |
3ee512ff | 4492 | smtp_cmd_argument, recipients_discarded? "MAIL" : "RCPT", |
1f12df4d | 4493 | log_msg ? US": " : US"", log_msg ? log_msg : US""); |
059ec3d9 PH |
4494 | } |
4495 | ||
4496 | /* Either the ACL failed the address, or it was deferred. */ | |
4497 | ||
4498 | else | |
4499 | { | |
4500 | if (rc == FAIL) rcpt_fail_count++; else rcpt_defer_count++; | |
4501 | done = smtp_handle_acl_fail(ACL_WHERE_RCPT, rc, user_msg, log_msg); | |
4502 | } | |
4503 | break; | |
4504 | ||
4505 | ||
4506 | /* The DATA command is legal only if it follows successful MAIL FROM | |
4507 | and RCPT TO commands. However, if pipelining is advertised, a bad DATA is | |
4508 | not counted as a protocol error if it follows RCPT (which must have been | |
4509 | rejected if there are no recipients.) This function is complete when a | |
4510 | valid DATA command is encountered. | |
4511 | ||
4512 | Note concerning the code used: RFC 2821 says this: | |
4513 | ||
4514 | - If there was no MAIL, or no RCPT, command, or all such commands | |
4515 | were rejected, the server MAY return a "command out of sequence" | |
4516 | (503) or "no valid recipients" (554) reply in response to the | |
4517 | DATA command. | |
4518 | ||
4519 | The example in the pipelining RFC 2920 uses 554, but I use 503 here | |
2679d413 PH |
4520 | because it is the same whether pipelining is in use or not. |
4521 | ||
4522 | If all the RCPT commands that precede DATA provoked the same error message | |
4523 | (often indicating some kind of system error), it is helpful to include it | |
4524 | with the DATA rejection (an idea suggested by Tony Finch). */ | |
059ec3d9 PH |
4525 | |
4526 | case DATA_CMD: | |
b4ed4da0 | 4527 | HAD(SCH_DATA); |
059ec3d9 PH |
4528 | if (!discarded && recipients_count <= 0) |
4529 | { | |
2679d413 PH |
4530 | if (rcpt_smtp_response_same && rcpt_smtp_response != NULL) |
4531 | { | |
4532 | uschar *code = US"503"; | |
4533 | int len = Ustrlen(rcpt_smtp_response); | |
4534 | smtp_respond(code, 3, FALSE, US"All RCPT commands were rejected with " | |
4535 | "this error:"); | |
4536 | /* Responses from smtp_printf() will have \r\n on the end */ | |
4537 | if (len > 2 && rcpt_smtp_response[len-2] == '\r') | |
4538 | rcpt_smtp_response[len-2] = 0; | |
4539 | smtp_respond(code, 3, FALSE, rcpt_smtp_response); | |
4540 | } | |
059ec3d9 | 4541 | if (pipelining_advertised && last_was_rcpt) |
2679d413 | 4542 | smtp_printf("503 Valid RCPT command must precede DATA\r\n"); |
059ec3d9 PH |
4543 | else |
4544 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
4545 | US"valid RCPT command must precede DATA"); | |
4546 | break; | |
4547 | } | |
4548 | ||
4549 | if (toomany && recipients_max_reject) | |
4550 | { | |
4551 | sender_address = NULL; /* This will allow a new MAIL without RSET */ | |
4552 | sender_address_unrewritten = NULL; | |
4553 | smtp_printf("554 Too many recipients\r\n"); | |
4554 | break; | |
4555 | } | |
8e669ac1 | 4556 | |
a14e5636 | 4557 | /* If there is an ACL, re-check the synchronization afterwards, since the |
528fde2a JH |
4558 | ACL may have delayed. To handle cutthrough delivery enforce a dummy call |
4559 | to get the DATA command sent. */ | |
a14e5636 | 4560 | |
5032d1cf | 4561 | if (acl_smtp_predata == NULL && cutthrough.fd < 0) rc = OK; else |
8e669ac1 | 4562 | { |
528fde2a | 4563 | uschar * acl= acl_smtp_predata ? acl_smtp_predata : US"accept"; |
5be20824 | 4564 | enable_dollar_recipients = TRUE; |
528fde2a | 4565 | rc = acl_check(ACL_WHERE_PREDATA, NULL, acl, &user_msg, |
5be20824 PH |
4566 | &log_msg); |
4567 | enable_dollar_recipients = FALSE; | |
a14e5636 | 4568 | if (rc == OK && !check_sync()) goto SYNC_FAILURE; |
5be20824 | 4569 | } |
059ec3d9 PH |
4570 | |
4571 | if (rc == OK) | |
4572 | { | |
fd98a5c6 JH |
4573 | uschar * code; |
4574 | code = US"354"; | |
4e88a19f | 4575 | if (user_msg == NULL) |
fd98a5c6 JH |
4576 | smtp_printf("%s Enter message, ending with \".\" on a line by itself\r\n", code); |
4577 | else smtp_user_msg(code, user_msg); | |
059ec3d9 PH |
4578 | done = 3; |
4579 | message_ended = END_NOTENDED; /* Indicate in middle of data */ | |
4580 | } | |
4581 | ||
4582 | /* Either the ACL failed the address, or it was deferred. */ | |
4583 | ||
4584 | else | |
4585 | done = smtp_handle_acl_fail(ACL_WHERE_PREDATA, rc, user_msg, log_msg); | |
059ec3d9 PH |
4586 | break; |
4587 | ||
4588 | ||
4589 | case VRFY_CMD: | |
b4ed4da0 | 4590 | HAD(SCH_VRFY); |
64ffc24f | 4591 | rc = acl_check(ACL_WHERE_VRFY, NULL, acl_smtp_vrfy, &user_msg, &log_msg); |
059ec3d9 PH |
4592 | if (rc != OK) |
4593 | done = smtp_handle_acl_fail(ACL_WHERE_VRFY, rc, user_msg, log_msg); | |
4594 | else | |
4595 | { | |
4596 | uschar *address; | |
4597 | uschar *s = NULL; | |
4598 | ||
4599 | /* rfc821_domains = TRUE; << no longer needed */ | |
ca86f471 | 4600 | address = parse_extract_address(smtp_cmd_data, &errmess, &start, &end, |
059ec3d9 PH |
4601 | &recipient_domain, FALSE); |
4602 | /* rfc821_domains = FALSE; << no longer needed */ | |
4603 | ||
4604 | if (address == NULL) | |
4605 | s = string_sprintf("501 %s", errmess); | |
4606 | else | |
4607 | { | |
4608 | address_item *addr = deliver_make_addr(address, FALSE); | |
4609 | switch(verify_address(addr, NULL, vopt_is_recipient | vopt_qualify, -1, | |
4deaf07d | 4610 | -1, -1, NULL, NULL, NULL)) |
059ec3d9 PH |
4611 | { |
4612 | case OK: | |
4613 | s = string_sprintf("250 <%s> is deliverable", address); | |
4614 | break; | |
4615 | ||
4616 | case DEFER: | |
81e509d7 PH |
4617 | s = (addr->user_message != NULL)? |
4618 | string_sprintf("451 <%s> %s", address, addr->user_message) : | |
059ec3d9 PH |
4619 | string_sprintf("451 Cannot resolve <%s> at this time", address); |
4620 | break; | |
4621 | ||
4622 | case FAIL: | |
81e509d7 PH |
4623 | s = (addr->user_message != NULL)? |
4624 | string_sprintf("550 <%s> %s", address, addr->user_message) : | |
059ec3d9 PH |
4625 | string_sprintf("550 <%s> is not deliverable", address); |
4626 | log_write(0, LOG_MAIN, "VRFY failed for %s %s", | |
3ee512ff | 4627 | smtp_cmd_argument, host_and_ident(TRUE)); |
059ec3d9 PH |
4628 | break; |
4629 | } | |
4630 | } | |
4631 | ||
4632 | smtp_printf("%s\r\n", s); | |
4633 | } | |
4634 | break; | |
4635 | ||
4636 | ||
4637 | case EXPN_CMD: | |
b4ed4da0 | 4638 | HAD(SCH_EXPN); |
64ffc24f | 4639 | rc = acl_check(ACL_WHERE_EXPN, NULL, acl_smtp_expn, &user_msg, &log_msg); |
059ec3d9 PH |
4640 | if (rc != OK) |
4641 | done = smtp_handle_acl_fail(ACL_WHERE_EXPN, rc, user_msg, log_msg); | |
4642 | else | |
4643 | { | |
4644 | BOOL save_log_testing_mode = log_testing_mode; | |
4645 | address_test_mode = log_testing_mode = TRUE; | |
ca86f471 | 4646 | (void) verify_address(deliver_make_addr(smtp_cmd_data, FALSE), |
64ffc24f PH |
4647 | smtp_out, vopt_is_recipient | vopt_qualify | vopt_expn, -1, -1, -1, |
4648 | NULL, NULL, NULL); | |
059ec3d9 PH |
4649 | address_test_mode = FALSE; |
4650 | log_testing_mode = save_log_testing_mode; /* true for -bh */ | |
4651 | } | |
4652 | break; | |
4653 | ||
4654 | ||
4655 | #ifdef SUPPORT_TLS | |
4656 | ||
4657 | case STARTTLS_CMD: | |
b4ed4da0 | 4658 | HAD(SCH_STARTTLS); |
059ec3d9 PH |
4659 | if (!tls_advertised) |
4660 | { | |
4661 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
4662 | US"STARTTLS command used when not advertised"); | |
4663 | break; | |
4664 | } | |
4665 | ||
4666 | /* Apply an ACL check if one is defined */ | |
4667 | ||
4668 | if (acl_smtp_starttls != NULL) | |
4669 | { | |
4670 | rc = acl_check(ACL_WHERE_STARTTLS, NULL, acl_smtp_starttls, &user_msg, | |
4671 | &log_msg); | |
4672 | if (rc != OK) | |
4673 | { | |
4674 | done = smtp_handle_acl_fail(ACL_WHERE_STARTTLS, rc, user_msg, log_msg); | |
4675 | break; | |
4676 | } | |
4677 | } | |
4678 | ||
4679 | /* RFC 2487 is not clear on when this command may be sent, though it | |
4680 | does state that all information previously obtained from the client | |
4681 | must be discarded if a TLS session is started. It seems reasonble to | |
4682 | do an implied RSET when STARTTLS is received. */ | |
4683 | ||
4684 | incomplete_transaction_log(US"STARTTLS"); | |
4685 | smtp_reset(reset_point); | |
4686 | toomany = FALSE; | |
4687 | cmd_list[CMD_LIST_STARTTLS].is_mail_cmd = FALSE; | |
4688 | ||
da80c2a8 PP |
4689 | /* There's an attack where more data is read in past the STARTTLS command |
4690 | before TLS is negotiated, then assumed to be part of the secure session | |
4691 | when used afterwards; we use segregated input buffers, so are not | |
4692 | vulnerable, but we want to note when it happens and, for sheer paranoia, | |
4693 | ensure that the buffer is "wiped". | |
4694 | Pipelining sync checks will normally have protected us too, unless disabled | |
4695 | by configuration. */ | |
4696 | ||
4697 | if (receive_smtp_buffered()) | |
4698 | { | |
4699 | DEBUG(D_any) | |
4700 | debug_printf("Non-empty input buffer after STARTTLS; naive attack?"); | |
817d9f57 | 4701 | if (tls_in.active < 0) |
da80c2a8 PP |
4702 | smtp_inend = smtp_inptr = smtp_inbuffer; |
4703 | /* and if TLS is already active, tls_server_start() should fail */ | |
4704 | } | |
4705 | ||
4e7ee012 PP |
4706 | /* There is nothing we value in the input buffer and if TLS is succesfully |
4707 | negotiated, we won't use this buffer again; if TLS fails, we'll just read | |
4708 | fresh content into it. The buffer contains arbitrary content from an | |
4709 | untrusted remote source; eg: NOOP <shellcode>\r\nSTARTTLS\r\n | |
4710 | It seems safest to just wipe away the content rather than leave it as a | |
4711 | target to jump to. */ | |
4712 | ||
4713 | memset(smtp_inbuffer, 0, in_buffer_size); | |
4714 | ||
059ec3d9 PH |
4715 | /* Attempt to start up a TLS session, and if successful, discard all |
4716 | knowledge that was obtained previously. At least, that's what the RFC says, | |
4717 | and that's what happens by default. However, in order to work round YAEB, | |
4718 | there is an option to remember the esmtp state. Sigh. | |
4719 | ||
4720 | We must allow for an extra EHLO command and an extra AUTH command after | |
4721 | STARTTLS that don't add to the nonmail command count. */ | |
4722 | ||
17c76198 | 4723 | if ((rc = tls_server_start(tls_require_ciphers)) == OK) |
059ec3d9 PH |
4724 | { |
4725 | if (!tls_remember_esmtp) | |
4726 | helo_seen = esmtp = auth_advertised = pipelining_advertised = FALSE; | |
4727 | cmd_list[CMD_LIST_EHLO].is_mail_cmd = TRUE; | |
4728 | cmd_list[CMD_LIST_AUTH].is_mail_cmd = TRUE; | |
b3ef41c9 | 4729 | cmd_list[CMD_LIST_TLS_AUTH].is_mail_cmd = TRUE; |
059ec3d9 PH |
4730 | if (sender_helo_name != NULL) |
4731 | { | |
4732 | store_free(sender_helo_name); | |
4733 | sender_helo_name = NULL; | |
4734 | host_build_sender_fullhost(); /* Rebuild */ | |
4735 | set_process_info("handling incoming TLS connection from %s", | |
4736 | host_and_ident(FALSE)); | |
4737 | } | |
e524074d JH |
4738 | received_protocol = |
4739 | (sender_host_address ? protocols : protocols_local) | |
4740 | [ (esmtp | |
4741 | ? pextend + (sender_host_authenticated ? pauthed : 0) | |
4742 | : pnormal) | |
4743 | + (tls_in.active >= 0 ? pcrpted : 0) | |
4744 | ]; | |
059ec3d9 PH |
4745 | |
4746 | sender_host_authenticated = NULL; | |
4747 | authenticated_id = NULL; | |
4748 | sync_cmd_limit = NON_SYNC_CMD_NON_PIPELINING; | |
4749 | DEBUG(D_tls) debug_printf("TLS active\n"); | |
4750 | break; /* Successful STARTTLS */ | |
4751 | } | |
4752 | ||
4753 | /* Some local configuration problem was discovered before actually trying | |
4754 | to do a TLS handshake; give a temporary error. */ | |
4755 | ||
4756 | else if (rc == DEFER) | |
4757 | { | |
4758 | smtp_printf("454 TLS currently unavailable\r\n"); | |
4759 | break; | |
4760 | } | |
4761 | ||
4762 | /* Hard failure. Reject everything except QUIT or closed connection. One | |
817d9f57 | 4763 | cause for failure is a nested STARTTLS, in which case tls_in.active remains |
059ec3d9 PH |
4764 | set, but we must still reject all incoming commands. */ |
4765 | ||
4766 | DEBUG(D_tls) debug_printf("TLS failed to start\n"); | |
4767 | while (done <= 0) | |
4768 | { | |
4769 | switch(smtp_read_command(FALSE)) | |
4770 | { | |
4771 | case EOF_CMD: | |
4772 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by EOF", | |
4773 | smtp_get_connection_info()); | |
8f128379 | 4774 | smtp_notquit_exit(US"tls-failed", NULL, NULL); |
059ec3d9 PH |
4775 | done = 2; |
4776 | break; | |
4777 | ||
8f128379 | 4778 | /* It is perhaps arguable as to which exit ACL should be called here, |
24f66b4d | 4779 | but as it is probably a situation that almost never arises, it |
8f128379 PH |
4780 | probably doesn't matter. We choose to call the real QUIT ACL, which in |
4781 | some sense is perhaps "right". */ | |
4782 | ||
059ec3d9 | 4783 | case QUIT_CMD: |
8f128379 PH |
4784 | user_msg = NULL; |
4785 | if (acl_smtp_quit != NULL) | |
4786 | { | |
4787 | rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, &user_msg, | |
4788 | &log_msg); | |
4789 | if (rc == ERROR) | |
4790 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s", | |
4791 | log_msg); | |
4792 | } | |
4793 | if (user_msg == NULL) | |
4794 | smtp_printf("221 %s closing connection\r\n", smtp_active_hostname); | |
4795 | else | |
4796 | smtp_respond(US"221", 3, TRUE, user_msg); | |
059ec3d9 PH |
4797 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT", |
4798 | smtp_get_connection_info()); | |
4799 | done = 2; | |
4800 | break; | |
4801 | ||
4802 | default: | |
4803 | smtp_printf("554 Security failure\r\n"); | |
4804 | break; | |
4805 | } | |
4806 | } | |
817d9f57 | 4807 | tls_close(TRUE, TRUE); |
059ec3d9 PH |
4808 | break; |
4809 | #endif | |
4810 | ||
4811 | ||
4812 | /* The ACL for QUIT is provided for gathering statistical information or | |
4813 | similar; it does not affect the response code, but it can supply a custom | |
4814 | message. */ | |
4815 | ||
4816 | case QUIT_CMD: | |
b4ed4da0 | 4817 | HAD(SCH_QUIT); |
059ec3d9 | 4818 | incomplete_transaction_log(US"QUIT"); |
059ec3d9 PH |
4819 | if (acl_smtp_quit != NULL) |
4820 | { | |
8f128379 | 4821 | rc = acl_check(ACL_WHERE_QUIT, NULL, acl_smtp_quit, &user_msg, &log_msg); |
059ec3d9 PH |
4822 | if (rc == ERROR) |
4823 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s", | |
4824 | log_msg); | |
4825 | } | |
059ec3d9 PH |
4826 | if (user_msg == NULL) |
4827 | smtp_printf("221 %s closing connection\r\n", smtp_active_hostname); | |
4828 | else | |
4e88a19f | 4829 | smtp_respond(US"221", 3, TRUE, user_msg); |
059ec3d9 PH |
4830 | |
4831 | #ifdef SUPPORT_TLS | |
817d9f57 | 4832 | tls_close(TRUE, TRUE); |
059ec3d9 PH |
4833 | #endif |
4834 | ||
4835 | done = 2; | |
4836 | log_write(L_smtp_connection, LOG_MAIN, "%s closed by QUIT", | |
4837 | smtp_get_connection_info()); | |
4838 | break; | |
4839 | ||
4840 | ||
4841 | case RSET_CMD: | |
b4ed4da0 | 4842 | HAD(SCH_RSET); |
059ec3d9 PH |
4843 | incomplete_transaction_log(US"RSET"); |
4844 | smtp_reset(reset_point); | |
4845 | toomany = FALSE; | |
4846 | smtp_printf("250 Reset OK\r\n"); | |
4847 | cmd_list[CMD_LIST_RSET].is_mail_cmd = FALSE; | |
4848 | break; | |
4849 | ||
4850 | ||
4851 | case NOOP_CMD: | |
b4ed4da0 | 4852 | HAD(SCH_NOOP); |
059ec3d9 PH |
4853 | smtp_printf("250 OK\r\n"); |
4854 | break; | |
4855 | ||
4856 | ||
b43a74ea PH |
4857 | /* Show ETRN/EXPN/VRFY if there's an ACL for checking hosts; if actually |
4858 | used, a check will be done for permitted hosts. Show STARTTLS only if not | |
4859 | already in a TLS session and if it would be advertised in the EHLO | |
4860 | response. */ | |
059ec3d9 PH |
4861 | |
4862 | case HELP_CMD: | |
b4ed4da0 | 4863 | HAD(SCH_HELP); |
059ec3d9 PH |
4864 | smtp_printf("214-Commands supported:\r\n"); |
4865 | { | |
4866 | uschar buffer[256]; | |
4867 | buffer[0] = 0; | |
4868 | Ustrcat(buffer, " AUTH"); | |
4869 | #ifdef SUPPORT_TLS | |
817d9f57 | 4870 | if (tls_in.active < 0 && |
b43a74ea PH |
4871 | verify_check_host(&tls_advertise_hosts) != FAIL) |
4872 | Ustrcat(buffer, " STARTTLS"); | |
059ec3d9 PH |
4873 | #endif |
4874 | Ustrcat(buffer, " HELO EHLO MAIL RCPT DATA"); | |
4875 | Ustrcat(buffer, " NOOP QUIT RSET HELP"); | |
4876 | if (acl_smtp_etrn != NULL) Ustrcat(buffer, " ETRN"); | |
4877 | if (acl_smtp_expn != NULL) Ustrcat(buffer, " EXPN"); | |
4878 | if (acl_smtp_vrfy != NULL) Ustrcat(buffer, " VRFY"); | |
4879 | smtp_printf("214%s\r\n", buffer); | |
4880 | } | |
4881 | break; | |
4882 | ||
4883 | ||
4884 | case EOF_CMD: | |
4885 | incomplete_transaction_log(US"connection lost"); | |
8f128379 PH |
4886 | smtp_notquit_exit(US"connection-lost", US"421", |
4887 | US"%s lost input connection", smtp_active_hostname); | |
059ec3d9 PH |
4888 | |
4889 | /* Don't log by default unless in the middle of a message, as some mailers | |
4890 | just drop the call rather than sending QUIT, and it clutters up the logs. | |
4891 | */ | |
4892 | ||
4893 | if (sender_address != NULL || recipients_count > 0) | |
4894 | log_write(L_lost_incoming_connection, | |
4895 | LOG_MAIN, | |
4896 | "unexpected %s while reading SMTP command from %s%s", | |
4897 | sender_host_unknown? "EOF" : "disconnection", | |
4898 | host_and_ident(FALSE), smtp_read_error); | |
4899 | ||
4900 | else log_write(L_smtp_connection, LOG_MAIN, "%s lost%s", | |
4901 | smtp_get_connection_info(), smtp_read_error); | |
4902 | ||
4903 | done = 1; | |
4904 | break; | |
4905 | ||
4906 | ||
4907 | case ETRN_CMD: | |
b4ed4da0 | 4908 | HAD(SCH_ETRN); |
059ec3d9 PH |
4909 | if (sender_address != NULL) |
4910 | { | |
4911 | done = synprot_error(L_smtp_protocol_error, 503, NULL, | |
4912 | US"ETRN is not permitted inside a transaction"); | |
4913 | break; | |
4914 | } | |
4915 | ||
3ee512ff | 4916 | log_write(L_etrn, LOG_MAIN, "ETRN %s received from %s", smtp_cmd_argument, |
059ec3d9 PH |
4917 | host_and_ident(FALSE)); |
4918 | ||
64ffc24f | 4919 | rc = acl_check(ACL_WHERE_ETRN, NULL, acl_smtp_etrn, &user_msg, &log_msg); |
059ec3d9 PH |
4920 | if (rc != OK) |
4921 | { | |
4922 | done = smtp_handle_acl_fail(ACL_WHERE_ETRN, rc, user_msg, log_msg); | |
4923 | break; | |
4924 | } | |
4925 | ||
4926 | /* Compute the serialization key for this command. */ | |
4927 | ||
ca86f471 | 4928 | etrn_serialize_key = string_sprintf("etrn-%s\n", smtp_cmd_data); |
059ec3d9 PH |
4929 | |
4930 | /* If a command has been specified for running as a result of ETRN, we | |
4931 | permit any argument to ETRN. If not, only the # standard form is permitted, | |
4932 | since that is strictly the only kind of ETRN that can be implemented | |
4933 | according to the RFC. */ | |
4934 | ||
4935 | if (smtp_etrn_command != NULL) | |
4936 | { | |
4937 | uschar *error; | |
4938 | BOOL rc; | |
4939 | etrn_command = smtp_etrn_command; | |
ca86f471 | 4940 | deliver_domain = smtp_cmd_data; |
059ec3d9 PH |
4941 | rc = transport_set_up_command(&argv, smtp_etrn_command, TRUE, 0, NULL, |
4942 | US"ETRN processing", &error); | |
4943 | deliver_domain = NULL; | |
4944 | if (!rc) | |
4945 | { | |
4946 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to set up ETRN command: %s", | |
4947 | error); | |
4948 | smtp_printf("458 Internal failure\r\n"); | |
4949 | break; | |
4950 | } | |
4951 | } | |
4952 | ||
4953 | /* Else set up to call Exim with the -R option. */ | |
4954 | ||
4955 | else | |
4956 | { | |
ca86f471 | 4957 | if (*smtp_cmd_data++ != '#') |
059ec3d9 PH |
4958 | { |
4959 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
4960 | US"argument must begin with #"); | |
4961 | break; | |
4962 | } | |
4963 | etrn_command = US"exim -R"; | |
55414b25 | 4964 | argv = CUSS child_exec_exim(CEE_RETURN_ARGV, TRUE, NULL, TRUE, 2, US"-R", |
ca86f471 | 4965 | smtp_cmd_data); |
059ec3d9 PH |
4966 | } |
4967 | ||
4968 | /* If we are host-testing, don't actually do anything. */ | |
4969 | ||
4970 | if (host_checking) | |
4971 | { | |
4972 | HDEBUG(D_any) | |
4973 | { | |
4974 | debug_printf("ETRN command is: %s\n", etrn_command); | |
4975 | debug_printf("ETRN command execution skipped\n"); | |
4976 | } | |
4e88a19f PH |
4977 | if (user_msg == NULL) smtp_printf("250 OK\r\n"); |
4978 | else smtp_user_msg(US"250", user_msg); | |
059ec3d9 PH |
4979 | break; |
4980 | } | |
4981 | ||
4982 | ||
4983 | /* If ETRN queue runs are to be serialized, check the database to | |
4984 | ensure one isn't already running. */ | |
4985 | ||
4986 | if (smtp_etrn_serialize && !enq_start(etrn_serialize_key)) | |
4987 | { | |
ca86f471 | 4988 | smtp_printf("458 Already processing %s\r\n", smtp_cmd_data); |
059ec3d9 PH |
4989 | break; |
4990 | } | |
4991 | ||
4992 | /* Fork a child process and run the command. We don't want to have to | |
4993 | wait for the process at any point, so set SIGCHLD to SIG_IGN before | |
4994 | forking. It should be set that way anyway for external incoming SMTP, | |
4995 | but we save and restore to be tidy. If serialization is required, we | |
4996 | actually run the command in yet another process, so we can wait for it | |
4997 | to complete and then remove the serialization lock. */ | |
4998 | ||
4999 | oldsignal = signal(SIGCHLD, SIG_IGN); | |
5000 | ||
5001 | if ((pid = fork()) == 0) | |
5002 | { | |
f1e894f3 PH |
5003 | smtp_input = FALSE; /* This process is not associated with the */ |
5004 | (void)fclose(smtp_in); /* SMTP call any more. */ | |
5005 | (void)fclose(smtp_out); | |
059ec3d9 PH |
5006 | |
5007 | signal(SIGCHLD, SIG_DFL); /* Want to catch child */ | |
5008 | ||
5009 | /* If not serializing, do the exec right away. Otherwise, fork down | |
5010 | into another process. */ | |
5011 | ||
5012 | if (!smtp_etrn_serialize || (pid = fork()) == 0) | |
5013 | { | |
5014 | DEBUG(D_exec) debug_print_argv(argv); | |
5015 | exim_nullstd(); /* Ensure std{in,out,err} exist */ | |
5016 | execv(CS argv[0], (char *const *)argv); | |
5017 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "exec of \"%s\" (ETRN) failed: %s", | |
5018 | etrn_command, strerror(errno)); | |
5019 | _exit(EXIT_FAILURE); /* paranoia */ | |
5020 | } | |
5021 | ||
5022 | /* Obey this if smtp_serialize and the 2nd fork yielded non-zero. That | |
5023 | is, we are in the first subprocess, after forking again. All we can do | |
5024 | for a failing fork is to log it. Otherwise, wait for the 2nd process to | |
5025 | complete, before removing the serialization. */ | |
5026 | ||
5027 | if (pid < 0) | |
5028 | log_write(0, LOG_MAIN|LOG_PANIC, "2nd fork for serialized ETRN " | |
5029 | "failed: %s", strerror(errno)); | |
5030 | else | |
5031 | { | |
5032 | int status; | |
5033 | DEBUG(D_any) debug_printf("waiting for serialized ETRN process %d\n", | |
5034 | (int)pid); | |
5035 | (void)wait(&status); | |
5036 | DEBUG(D_any) debug_printf("serialized ETRN process %d ended\n", | |
5037 | (int)pid); | |
5038 | } | |
5039 | ||
5040 | enq_end(etrn_serialize_key); | |
5041 | _exit(EXIT_SUCCESS); | |
5042 | } | |
5043 | ||
5044 | /* Back in the top level SMTP process. Check that we started a subprocess | |
5045 | and restore the signal state. */ | |
5046 | ||
5047 | if (pid < 0) | |
5048 | { | |
5049 | log_write(0, LOG_MAIN|LOG_PANIC, "fork of process for ETRN failed: %s", | |
5050 | strerror(errno)); | |
5051 | smtp_printf("458 Unable to fork process\r\n"); | |
5052 | if (smtp_etrn_serialize) enq_end(etrn_serialize_key); | |
5053 | } | |
4e88a19f PH |
5054 | else |
5055 | { | |
5056 | if (user_msg == NULL) smtp_printf("250 OK\r\n"); | |
5057 | else smtp_user_msg(US"250", user_msg); | |
5058 | } | |
059ec3d9 PH |
5059 | |
5060 | signal(SIGCHLD, oldsignal); | |
5061 | break; | |
5062 | ||
5063 | ||
5064 | case BADARG_CMD: | |
5065 | done = synprot_error(L_smtp_syntax_error, 501, NULL, | |
5066 | US"unexpected argument data"); | |
5067 | break; | |
5068 | ||
5069 | ||
5070 | /* This currently happens only for NULLs, but could be extended. */ | |
5071 | ||
5072 | case BADCHAR_CMD: | |
5073 | done = synprot_error(L_smtp_syntax_error, 0, NULL, /* Just logs */ | |
5074 | US"NULL character(s) present (shown as '?')"); | |
5075 | smtp_printf("501 NULL characters are not allowed in SMTP commands\r\n"); | |
5076 | break; | |
5077 | ||
5078 | ||
5079 | case BADSYN_CMD: | |
a14e5636 | 5080 | SYNC_FAILURE: |
059ec3d9 PH |
5081 | if (smtp_inend >= smtp_inbuffer + in_buffer_size) |
5082 | smtp_inend = smtp_inbuffer + in_buffer_size - 1; | |
5083 | c = smtp_inend - smtp_inptr; | |
5084 | if (c > 150) c = 150; | |
5085 | smtp_inptr[c] = 0; | |
5086 | incomplete_transaction_log(US"sync failure"); | |
3af76a81 | 5087 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP protocol synchronization error " |
059ec3d9 PH |
5088 | "(next input sent too soon: pipelining was%s advertised): " |
5089 | "rejected \"%s\" %s next input=\"%s\"", | |
5090 | pipelining_advertised? "" : " not", | |
3ee512ff | 5091 | smtp_cmd_buffer, host_and_ident(TRUE), |
059ec3d9 | 5092 | string_printing(smtp_inptr)); |
8f128379 PH |
5093 | smtp_notquit_exit(US"synchronization-error", US"554", |
5094 | US"SMTP synchronization error"); | |
059ec3d9 PH |
5095 | done = 1; /* Pretend eof - drops connection */ |
5096 | break; | |
5097 | ||
5098 | ||
5099 | case TOO_MANY_NONMAIL_CMD: | |
ca86f471 PH |
5100 | s = smtp_cmd_buffer; |
5101 | while (*s != 0 && !isspace(*s)) s++; | |
059ec3d9 PH |
5102 | incomplete_transaction_log(US"too many non-mail commands"); |
5103 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
5104 | "nonmail commands (last was \"%.*s\")", host_and_ident(FALSE), | |
6d9cfc47 | 5105 | (int)(s - smtp_cmd_buffer), smtp_cmd_buffer); |
8f128379 | 5106 | smtp_notquit_exit(US"bad-commands", US"554", US"Too many nonmail commands"); |
059ec3d9 PH |
5107 | done = 1; /* Pretend eof - drops connection */ |
5108 | break; | |
5109 | ||
a3c86431 TL |
5110 | #ifdef EXPERIMENTAL_PROXY |
5111 | case PROXY_FAIL_IGNORE_CMD: | |
5112 | smtp_printf("503 Command refused, required Proxy negotiation failed\r\n"); | |
5113 | break; | |
5114 | #endif | |
059ec3d9 PH |
5115 | |
5116 | default: | |
5117 | if (unknown_command_count++ >= smtp_max_unknown_commands) | |
5118 | { | |
5119 | log_write(L_smtp_syntax_error, LOG_MAIN, | |
5120 | "SMTP syntax error in \"%s\" %s %s", | |
3ee512ff | 5121 | string_printing(smtp_cmd_buffer), host_and_ident(TRUE), |
059ec3d9 PH |
5122 | US"unrecognized command"); |
5123 | incomplete_transaction_log(US"unrecognized command"); | |
8f128379 PH |
5124 | smtp_notquit_exit(US"bad-commands", US"500", |
5125 | US"Too many unrecognized commands"); | |
059ec3d9 PH |
5126 | done = 2; |
5127 | log_write(0, LOG_MAIN|LOG_REJECT, "SMTP call from %s dropped: too many " | |
5128 | "unrecognized commands (last was \"%s\")", host_and_ident(FALSE), | |
0ebc4d69 | 5129 | string_printing(smtp_cmd_buffer)); |
059ec3d9 PH |
5130 | } |
5131 | else | |
5132 | done = synprot_error(L_smtp_syntax_error, 500, NULL, | |
5133 | US"unrecognized command"); | |
5134 | break; | |
5135 | } | |
5136 | ||
5137 | /* This label is used by goto's inside loops that want to break out to | |
5138 | the end of the command-processing loop. */ | |
5139 | ||
5140 | COMMAND_LOOP: | |
5141 | last_was_rej_mail = was_rej_mail; /* Remember some last commands for */ | |
5142 | last_was_rcpt = was_rcpt; /* protocol error handling */ | |
5143 | continue; | |
5144 | } | |
5145 | ||
5146 | return done - 2; /* Convert yield values */ | |
5147 | } | |
5148 | ||
e45a1c37 JH |
5149 | /* vi: aw ai sw=2 |
5150 | */ | |
059ec3d9 | 5151 | /* End of smtp_in.c */ |