1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_event.h>
10 #include <ngx_mail.h>
11 #include <ngx_mail_smtp_module.h>
12
13
14 static void ngx_mail_smtp_resolve_addr_handler(ngx_resolver_ctx_t *ctx);
15 static void ngx_mail_smtp_resolve_name(ngx_event_t *rev);
16 static void ngx_mail_smtp_resolve_name_handler(ngx_resolver_ctx_t *ctx);
17 static void ngx_mail_smtp_greeting(ngx_mail_session_t *s, ngx_connection_t *c);
18 static void ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev);
19 static ngx_int_t ngx_mail_smtp_create_buffer(ngx_mail_session_t *s,
20 ngx_connection_t *c);
21
22 static ngx_int_t ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c);
23 static ngx_int_t ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c);
24 static ngx_int_t ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c);
25 static ngx_int_t ngx_mail_smtp_starttls(ngx_mail_session_t *s,
26 ngx_connection_t *c);
27 static ngx_int_t ngx_mail_smtp_rset(ngx_mail_session_t *s, ngx_connection_t *c);
28 static ngx_int_t ngx_mail_smtp_rcpt(ngx_mail_session_t *s, ngx_connection_t *c);
29
30 static ngx_int_t ngx_mail_smtp_discard_command(ngx_mail_session_t *s,
31 ngx_connection_t *c, char *err);
32 static void ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s,
33 ngx_connection_t *c, char *err);
34
35
36 static u_char smtp_ok[] = "250 2.0.0 OK" CRLF;
37 static u_char smtp_bye[] = "221 2.0.0 Bye" CRLF;
38 static u_char smtp_starttls[] = "220 2.0.0 Start TLS" CRLF;
39 static u_char smtp_next[] = "334 " CRLF;
40 static u_char smtp_username[] = "334 VXNlcm5hbWU6" CRLF;
41 static u_char smtp_password[] = "334 UGFzc3dvcmQ6" CRLF;
42 static u_char smtp_invalid_command[] = "500 5.5.1 Invalid command" CRLF;
43 static u_char smtp_invalid_pipelining[] =
44 "503 5.5.0 Improper use of SMTP command pipelining" CRLF;
45 static u_char smtp_invalid_argument[] = "501 5.5.4 Invalid argument" CRLF;
46 static u_char smtp_auth_required[] = "530 5.7.1 Authentication required" CRLF;
47 static u_char smtp_bad_sequence[] = "503 5.5.1 Bad sequence of commands" CRLF;
48
49
50 static ngx_str_t smtp_unavailable = ngx_string("[UNAVAILABLE]");
51 static ngx_str_t smtp_tempunavail = ngx_string("[TEMPUNAVAIL]");
52
53
54 void
55 ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
56 {
57 struct sockaddr_in *sin;
58 ngx_resolver_ctx_t *ctx;
59 ngx_mail_core_srv_conf_t *cscf;
60
61 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
62
63 if (cscf->resolver == NULL) {
64 s->host = smtp_unavailable;
65 ngx_mail_smtp_greeting(s, c);
66 return;
67 }
68
69 if (c->sockaddr->sa_family != AF_INET) {
70 s->host = smtp_tempunavail;
71 ngx_mail_smtp_greeting(s, c);
72 return;
73 }
74
75 c->log->action = "in resolving client address";
76
77 ctx = ngx_resolve_start(cscf->resolver, NULL);
78 if (ctx == NULL) {
79 ngx_mail_close_connection(c);
80 return;
81 }
82
83 /* AF_INET only */
84
85 sin = (struct sockaddr_in *) c->sockaddr;
86
87 ctx->addr = sin->sin_addr.s_addr;
88 ctx->handler = ngx_mail_smtp_resolve_addr_handler;
89 ctx->data = s;
90 ctx->timeout = cscf->resolver_timeout;
91
92 if (ngx_resolve_addr(ctx) != NGX_OK) {
93 ngx_mail_close_connection(c);
94 }
95 }
96
97
98 static void
99 ngx_mail_smtp_resolve_addr_handler(ngx_resolver_ctx_t *ctx)
100 {
101 ngx_connection_t *c;
102 ngx_mail_session_t *s;
103
104 s = ctx->data;
105 c = s->connection;
106
107 if (ctx->state) {
108 ngx_log_error(NGX_LOG_ERR, c->log, 0,
109 "%V could not be resolved (%i: %s)",
110 &c->addr_text, ctx->state,
111 ngx_resolver_strerror(ctx->state));
112
113 if (ctx->state == NGX_RESOLVE_NXDOMAIN) {
114 s->host = smtp_unavailable;
115
116 } else {
117 s->host = smtp_tempunavail;
118 }
119
120 ngx_resolve_addr_done(ctx);
121
122 ngx_mail_smtp_greeting(s, s->connection);
123
124 return;
125 }
126
127 c->log->action = "in resolving client hostname";
128
129 s->host.data = ngx_pstrdup(c->pool, &ctx->name);
130 if (s->host.data == NULL) {
131 ngx_resolve_addr_done(ctx);
132 ngx_mail_close_connection(c);
133 return;
134 }
135
136 s->host.len = ctx->name.len;
137
138 ngx_resolve_addr_done(ctx);
139
140 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
141 "address resolved: %V", &s->host);
142
143 c->read->handler = ngx_mail_smtp_resolve_name;
144
145 ngx_post_event(c->read, &ngx_posted_events);
146 }
147
148
149 static void
150 ngx_mail_smtp_resolve_name(ngx_event_t *rev)
151 {
152 ngx_connection_t *c;
153 ngx_mail_session_t *s;
154 ngx_resolver_ctx_t *ctx;
155 ngx_mail_core_srv_conf_t *cscf;
156
157 c = rev->data;
158 s = c->data;
159
160 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
161
162 ctx = ngx_resolve_start(cscf->resolver, NULL);
163 if (ctx == NULL) {
164 ngx_mail_close_connection(c);
165 return;
166 }
167
168 ctx->name = s->host;
169 ctx->type = NGX_RESOLVE_A;
170 ctx->handler = ngx_mail_smtp_resolve_name_handler;
171 ctx->data = s;
172 ctx->timeout = cscf->resolver_timeout;
173
174 if (ngx_resolve_name(ctx) != NGX_OK) {
175 ngx_mail_close_connection(c);
176 }
177 }
178
179
180 static void
181 ngx_mail_smtp_resolve_name_handler(ngx_resolver_ctx_t *ctx)
182 {
183 in_addr_t addr;
184 ngx_uint_t i;
185 ngx_connection_t *c;
186 struct sockaddr_in *sin;
187 ngx_mail_session_t *s;
188
189 s = ctx->data;
190 c = s->connection;
191
192 if (ctx->state) {
193 ngx_log_error(NGX_LOG_ERR, c->log, 0,
194 "%V could not be resolved (%i: %s)",
195 &ctx->name, ctx->state,
196 ngx_resolver_strerror(ctx->state));
197
198 if (ctx->state == NGX_RESOLVE_NXDOMAIN) {
199 s->host = smtp_unavailable;
200
201 } else {
202 s->host = smtp_tempunavail;
203 }
204
205 } else {
206
207 /* AF_INET only */
208
209 sin = (struct sockaddr_in *) c->sockaddr;
210
211 for (i = 0; i < ctx->naddrs; i++) {
212
213 addr = ctx->addrs[i];
214
215 ngx_log_debug4(NGX_LOG_DEBUG_MAIL, c->log, 0,
216 "name was resolved to %ud.%ud.%ud.%ud",
217 (ntohl(addr) >> 24) & 0xff,
218 (ntohl(addr) >> 16) & 0xff,
219 (ntohl(addr) >> 8) & 0xff,
220 ntohl(addr) & 0xff);
221
222 if (addr == sin->sin_addr.s_addr) {
223 goto found;
224 }
225 }
226
227 s->host = smtp_unavailable;
228 }
229
230 found:
231
232 ngx_resolve_name_done(ctx);
233
234 ngx_mail_smtp_greeting(s, c);
235 }
236
237
238 static void
239 ngx_mail_smtp_greeting(ngx_mail_session_t *s, ngx_connection_t *c)
240 {
241 ngx_msec_t timeout;
242 ngx_mail_core_srv_conf_t *cscf;
243 ngx_mail_smtp_srv_conf_t *sscf;
244
245 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
246 "smtp greeting for \"%V\"", &s->host);
247
248 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
249 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
250
251 timeout = sscf->greeting_delay ? sscf->greeting_delay : cscf->timeout;
252 ngx_add_timer(c->read, timeout);
253
254 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
255 ngx_mail_close_connection(c);
256 }
257
258 if (sscf->greeting_delay) {
259 c->read->handler = ngx_mail_smtp_invalid_pipelining;
260 return;
261 }
262
263 c->read->handler = ngx_mail_smtp_init_protocol;
264
265 s->out = sscf->greeting;
266
267 ngx_mail_send(c->write);
268 }
269
270
271 static void
272 ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev)
273 {
274 ngx_connection_t *c;
275 ngx_mail_session_t *s;
276 ngx_mail_core_srv_conf_t *cscf;
277 ngx_mail_smtp_srv_conf_t *sscf;
278
279 c = rev->data;
280 s = c->data;
281
282 c->log->action = "in delay pipelining state";
283
284 if (rev->timedout) {
285
286 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "delay greeting");
287
288 rev->timedout = 0;
289
290 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
291
292 c->read->handler = ngx_mail_smtp_init_protocol;
293
294 ngx_add_timer(c->read, cscf->timeout);
295
296 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
297 ngx_mail_close_connection(c);
298 return;
299 }
300
301 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
302
303 s->out = sscf->greeting;
304
305 } else {
306
307 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "invalid pipelining");
308
309 if (s->buffer == NULL) {
310 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) {
311 return;
312 }
313 }
314
315 if (ngx_mail_smtp_discard_command(s, c,
316 "client was rejected before greeting: \"%V\"")
317 != NGX_OK)
318 {
319 return;
320 }
321
322 s->out.len = sizeof(smtp_invalid_pipelining) - 1;
323 s->out.data = smtp_invalid_pipelining;
324 }
325
326 ngx_mail_send(c->write);
327 }
328
329
330 void
331 ngx_mail_smtp_init_protocol(ngx_event_t *rev)
332 {
333 ngx_connection_t *c;
334 ngx_mail_session_t *s;
335
336 c = rev->data;
337
338 c->log->action = "in auth state";
339
340 if (rev->timedout) {
341 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
342 c->timedout = 1;
343 ngx_mail_close_connection(c);
344 return;
345 }
346
347 s = c->data;
348
349 if (s->buffer == NULL) {
350 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) {
351 return;
352 }
353 }
354
355 s->mail_state = ngx_smtp_start;
356 c->read->handler = ngx_mail_smtp_auth_state;
357
358 ngx_mail_smtp_auth_state(rev);
359 }
360
361
362 static ngx_int_t
363 ngx_mail_smtp_create_buffer(ngx_mail_session_t *s, ngx_connection_t *c)
364 {
365 ngx_mail_smtp_srv_conf_t *sscf;
366
367 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) == NGX_ERROR) {
368 ngx_mail_session_internal_server_error(s);
369 return NGX_ERROR;
370 }
371
372 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
373
374 s->buffer = ngx_create_temp_buf(c->pool, sscf->client_buffer_size);
375 if (s->buffer == NULL) {
376 ngx_mail_session_internal_server_error(s);
377 return NGX_ERROR;
378 }
379
380 return NGX_OK;
381 }
382
383
384 void
385 ngx_mail_smtp_auth_state(ngx_event_t *rev)
386 {
387 ngx_int_t rc;
388 ngx_connection_t *c;
389 ngx_mail_session_t *s;
390
391 c = rev->data;
392 s = c->data;
393
394 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp auth state");
395
396 if (rev->timedout) {
397 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
398 c->timedout = 1;
399 ngx_mail_close_connection(c);
400 return;
401 }
402
403 if (s->out.len) {
404 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp send handler busy");
405 s->blocked = 1;
406 return;
407 }
408
409 s->blocked = 0;
410
411 rc = ngx_mail_read_command(s, c);
412
413 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
414 return;
415 }
416
417 s->out.len = sizeof(smtp_ok) - 1;
418 s->out.data = smtp_ok;
419
420 if (rc == NGX_OK) {
421 switch (s->mail_state) {
422
423 case ngx_smtp_start:
424
425 switch (s->command) {
426
427 case NGX_SMTP_HELO:
428 case NGX_SMTP_EHLO:
429 rc = ngx_mail_smtp_helo(s, c);
430 break;
431
432 case NGX_SMTP_AUTH:
433 rc = ngx_mail_smtp_auth(s, c);
434 break;
435
436 case NGX_SMTP_QUIT:
437 s->quit = 1;
438 s->out.len = sizeof(smtp_bye) - 1;
439 s->out.data = smtp_bye;
440 break;
441
442 case NGX_SMTP_MAIL:
443 rc = ngx_mail_smtp_mail(s, c);
444 break;
445
446 case NGX_SMTP_RCPT:
447 rc = ngx_mail_smtp_rcpt(s, c);
448 break;
449
450 case NGX_SMTP_RSET:
451 rc = ngx_mail_smtp_rset(s, c);
452 break;
453
454 case NGX_SMTP_NOOP:
455 break;
456
457 case NGX_SMTP_STARTTLS:
458 rc = ngx_mail_smtp_starttls(s, c);
459 s->out.len = sizeof(smtp_starttls) - 1;
460 s->out.data = smtp_starttls;
461 break;
462
463 default:
464 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
465 break;
466 }
467
468 break;
469
470 case ngx_smtp_auth_login_username:
471 rc = ngx_mail_auth_login_username(s, c, 0);
472
473 s->out.len = sizeof(smtp_password) - 1;
474 s->out.data = smtp_password;
475 s->mail_state = ngx_smtp_auth_login_password;
476 break;
477
478 case ngx_smtp_auth_login_password:
479 rc = ngx_mail_auth_login_password(s, c);
480 break;
481
482 case ngx_smtp_auth_plain:
483 rc = ngx_mail_auth_plain(s, c, 0);
484 break;
485
486 case ngx_smtp_auth_cram_md5:
487 rc = ngx_mail_auth_cram_md5(s, c);
488 break;
489 }
490 }
491
492 switch (rc) {
493
494 case NGX_DONE:
495 ngx_mail_auth(s, c);
496 return;
497
498 case NGX_ERROR:
499 ngx_mail_session_internal_server_error(s);
500 return;
501
502 case NGX_MAIL_PARSE_INVALID_COMMAND:
503 s->mail_state = ngx_smtp_start;
504 s->state = 0;
505
506 s->out.len = sizeof(smtp_invalid_command) - 1;
507 s->out.data = smtp_invalid_command;
508
509 /* fall through */
510
511 case NGX_OK:
512 s->args.nelts = 0;
513 s->buffer->pos = s->buffer->start;
514 s->buffer->last = s->buffer->start;
515
516 if (s->state) {
517 s->arg_start = s->buffer->start;
518 }
519
520 ngx_mail_send(c->write);
521 }
522 }
523
524
525 static ngx_int_t
526 ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c)
527 {
528 ngx_str_t *arg;
529 ngx_mail_smtp_srv_conf_t *sscf;
530
531 if (s->args.nelts != 1) {
532 s->out.len = sizeof(smtp_invalid_argument) - 1;
533 s->out.data = smtp_invalid_argument;
534 s->state = 0;
535 return NGX_OK;
536 }
537
538 arg = s->args.elts;
539
540 s->smtp_helo.len = arg[0].len;
541
542 s->smtp_helo.data = ngx_pnalloc(c->pool, arg[0].len);
543 if (s->smtp_helo.data == NULL) {
544 return NGX_ERROR;
545 }
546
547 ngx_memcpy(s->smtp_helo.data, arg[0].data, arg[0].len);
548
549 s->smtp_from.len = 0;
550 s->smtp_from.data = NULL;
551 s->smtp_to.len = 0;
552 s->smtp_to.data = NULL;
553
554 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
555
556 if (s->command == NGX_SMTP_HELO) {
557 s->out = sscf->server_name;
558
559 } else {
560 s->esmtp = 1;
561
562 #if (NGX_MAIL_SSL)
563
564 if (c->ssl == NULL) {
565 ngx_mail_ssl_conf_t *sslcf;
566
567 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
568
569 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
570 s->out = sscf->starttls_capability;
571 return NGX_OK;
572 }
573
574 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
575 s->out = sscf->starttls_only_capability;
576 return NGX_OK;
577 }
578 }
579 #endif
580
581 s->out = sscf->capability;
582 }
583
584 return NGX_OK;
585 }
586
587
588 static ngx_int_t
589 ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c)
590 {
591 ngx_int_t rc;
592 ngx_mail_core_srv_conf_t *cscf;
593 ngx_mail_smtp_srv_conf_t *sscf;
594
595 #if (NGX_MAIL_SSL)
596 if (ngx_mail_starttls_only(s, c)) {
597 return NGX_MAIL_PARSE_INVALID_COMMAND;
598 }
599 #endif
600
601 if (s->args.nelts == 0) {
602 s->out.len = sizeof(smtp_invalid_argument) - 1;
603 s->out.data = smtp_invalid_argument;
604 s->state = 0;
605 return NGX_OK;
606 }
607
608 rc = ngx_mail_auth_parse(s, c);
609
610 switch (rc) {
611
612 case NGX_MAIL_AUTH_LOGIN:
613
614 s->out.len = sizeof(smtp_username) - 1;
615 s->out.data = smtp_username;
616 s->mail_state = ngx_smtp_auth_login_username;
617
618 return NGX_OK;
619
620 case NGX_MAIL_AUTH_LOGIN_USERNAME:
621
622 s->out.len = sizeof(smtp_password) - 1;
623 s->out.data = smtp_password;
624 s->mail_state = ngx_smtp_auth_login_password;
625
626 return ngx_mail_auth_login_username(s, c, 1);
627
628 case NGX_MAIL_AUTH_PLAIN:
629
630 s->out.len = sizeof(smtp_next) - 1;
631 s->out.data = smtp_next;
632 s->mail_state = ngx_smtp_auth_plain;
633
634 return NGX_OK;
635
636 case NGX_MAIL_AUTH_CRAM_MD5:
637
638 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
639
640 if (!(sscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
641 return NGX_MAIL_PARSE_INVALID_COMMAND;
642 }
643
644 if (s->salt.data == NULL) {
645 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
646
647 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
648 return NGX_ERROR;
649 }
650 }
651
652 if (ngx_mail_auth_cram_md5_salt(s, c, "334 ", 4) == NGX_OK) {
653 s->mail_state = ngx_smtp_auth_cram_md5;
654 return NGX_OK;
655 }
656
657 return NGX_ERROR;
658 }
659
660 return rc;
661 }
662
663
664 static ngx_int_t
665 ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c)
666 {
667 u_char ch;
668 ngx_str_t l;
669 ngx_uint_t i;
670 ngx_mail_smtp_srv_conf_t *sscf;
671
672 sscf = ngx_mail_get_module_srv_conf(s, ngx_mail_smtp_module);
673
674 if (!(sscf->auth_methods & NGX_MAIL_AUTH_NONE_ENABLED)) {
675 ngx_mail_smtp_log_rejected_command(s, c, "client was rejected: \"%V\"");
676
677 s->out.len = sizeof(smtp_auth_required) - 1;
678 s->out.data = smtp_auth_required;
679
680 return NGX_OK;
681 }
682
683 /* auth none */
684
685 if (s->smtp_from.len) {
686 s->out.len = sizeof(smtp_bad_sequence) - 1;
687 s->out.data = smtp_bad_sequence;
688 return NGX_OK;
689 }
690
691 l.len = s->buffer->last - s->buffer->start;
692 l.data = s->buffer->start;
693
694 for (i = 0; i < l.len; i++) {
695 ch = l.data[i];
696
697 if (ch != CR && ch != LF) {
698 continue;
699 }
700
701 l.data[i] = ' ';
702 }
703
704 while (i) {
705 if (l.data[i - 1] != ' ') {
706 break;
707 }
708
709 i--;
710 }
711
712 l.len = i;
713
714 s->smtp_from.len = l.len;
715
716 s->smtp_from.data = ngx_pnalloc(c->pool, l.len);
717 if (s->smtp_from.data == NULL) {
718 return NGX_ERROR;
719 }
720
721 ngx_memcpy(s->smtp_from.data, l.data, l.len);
722
723 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
724 "smtp mail from:\"%V\"", &s->smtp_from);
725
726 s->out.len = sizeof(smtp_ok) - 1;
727 s->out.data = smtp_ok;
728
729 return NGX_OK;
730 }
731
732
733 static ngx_int_t
734 ngx_mail_smtp_rcpt(ngx_mail_session_t *s, ngx_connection_t *c)
735 {
736 u_char ch;
737 ngx_str_t l;
738 ngx_uint_t i;
739
740 if (s->smtp_from.len == 0) {
741 s->out.len = sizeof(smtp_bad_sequence) - 1;
742 s->out.data = smtp_bad_sequence;
743 return NGX_OK;
744 }
745
746 l.len = s->buffer->last - s->buffer->start;
747 l.data = s->buffer->start;
748
749 for (i = 0; i < l.len; i++) {
750 ch = l.data[i];
751
752 if (ch != CR && ch != LF) {
753 continue;
754 }
755
756 l.data[i] = ' ';
757 }
758
759 while (i) {
760 if (l.data[i - 1] != ' ') {
761 break;
762 }
763
764 i--;
765 }
766
767 l.len = i;
768
769 s->smtp_to.len = l.len;
770
771 s->smtp_to.data = ngx_pnalloc(c->pool, l.len);
772 if (s->smtp_to.data == NULL) {
773 return NGX_ERROR;
774 }
775
776 ngx_memcpy(s->smtp_to.data, l.data, l.len);
777
778 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
779 "smtp rcpt to:\"%V\"", &s->smtp_to);
780
781 s->auth_method = NGX_MAIL_AUTH_NONE;
782
783 return NGX_DONE;
784 }
785
786
787 static ngx_int_t
788 ngx_mail_smtp_rset(ngx_mail_session_t *s, ngx_connection_t *c)
789 {
790 s->smtp_from.len = 0;
791 s->smtp_from.data = NULL;
792 s->smtp_to.len = 0;
793 s->smtp_to.data = NULL;
794
795 s->out.len = sizeof(smtp_ok) - 1;
796 s->out.data = smtp_ok;
797
798 return NGX_OK;
799 }
800
801
802 static ngx_int_t
803 ngx_mail_smtp_starttls(ngx_mail_session_t *s, ngx_connection_t *c)
804 {
805 #if (NGX_MAIL_SSL)
806 ngx_mail_ssl_conf_t *sslcf;
807
808 if (c->ssl == NULL) {
809 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
810 if (sslcf->starttls) {
811
812 /*
813 * RFC3207 requires us to discard any knowledge
814 * obtained from client before STARTTLS.
815 */
816
817 s->smtp_helo.len = 0;
818 s->smtp_helo.data = NULL;
819 s->smtp_from.len = 0;
820 s->smtp_from.data = NULL;
821 s->smtp_to.len = 0;
822 s->smtp_to.data = NULL;
823
824 c->read->handler = ngx_mail_starttls_handler;
825 return NGX_OK;
826 }
827 }
828
829 #endif
830
831 return NGX_MAIL_PARSE_INVALID_COMMAND;
832 }
833
834
835 static ngx_int_t
836 ngx_mail_smtp_discard_command(ngx_mail_session_t *s, ngx_connection_t *c,
837 char *err)
838 {
839 ssize_t n;
840
841 n = c->recv(c, s->buffer->last, s->buffer->end - s->buffer->last);
842
843 if (n == NGX_ERROR || n == 0) {
844 ngx_mail_close_connection(c);
845 return NGX_ERROR;
846 }
847
848 if (n > 0) {
849 s->buffer->last += n;
850 }
851
852 if (n == NGX_AGAIN) {
853 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
854 ngx_mail_session_internal_server_error(s);
855 return NGX_ERROR;
856 }
857
858 return NGX_AGAIN;
859 }
860
861 ngx_mail_smtp_log_rejected_command(s, c, err);
862
863 s->buffer->pos = s->buffer->start;
864 s->buffer->last = s->buffer->start;
865
866 return NGX_OK;
867 }
868
869
870 static void
871 ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s, ngx_connection_t *c,
872 char *err)
873 {
874 u_char ch;
875 ngx_str_t cmd;
876 ngx_uint_t i;
877
878 if (c->log->log_level < NGX_LOG_INFO) {
879 return;
880 }
881
882 cmd.len = s->buffer->last - s->buffer->start;
883 cmd.data = s->buffer->start;
884
885 for (i = 0; i < cmd.len; i++) {
886 ch = cmd.data[i];
887
888 if (ch != CR && ch != LF) {
889 continue;
890 }
891
892 cmd.data[i] = '_';
893 }
894
895 cmd.len = i;
896
897 ngx_log_error(NGX_LOG_INFO, c->log, 0, err, &cmd);
898 }
899
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