|
336
|
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
|
|
366
|
14 static void ngx_mail_smtp_resolve_addr_handler(ngx_resolver_ctx_t *ctx);
|
|
451
|
15 static void ngx_mail_smtp_resolve_name(ngx_event_t *rev);
|
|
366
|
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);
|
|
336
|
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);
|
|
429
|
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);
|
|
336
|
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;
|
|
358
|
38 static u_char smtp_starttls[] = "220 2.0.0 Start TLS" CRLF;
|
|
336
|
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;
|
|
429
|
47 static u_char smtp_bad_sequence[] = "503 5.5.1 Bad sequence of commands" CRLF;
|
|
336
|
48
|
|
|
49
|
|
366
|
50 static ngx_str_t smtp_unavailable = ngx_string("[UNAVAILABLE]");
|
|
|
51 static ngx_str_t smtp_tempunavail = ngx_string("[TEMPUNAVAIL]");
|
|
|
52
|
|
|
53
|
|
336
|
54 void
|
|
|
55 ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
56 {
|
|
366
|
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
|
|
501
|
69 if (c->sockaddr->sa_family != AF_INET) {
|
|
|
70 s->host = smtp_tempunavail;
|
|
|
71 ngx_mail_smtp_greeting(s, c);
|
|
|
72 return;
|
|
|
73 }
|
|
|
74
|
|
366
|
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 {
|
|
451
|
101 ngx_connection_t *c;
|
|
|
102 ngx_mail_session_t *s;
|
|
366
|
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
|
|
451
|
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
|
|
366
|
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 {
|
|
336
|
241 ngx_msec_t timeout;
|
|
|
242 ngx_mail_core_srv_conf_t *cscf;
|
|
|
243 ngx_mail_smtp_srv_conf_t *sscf;
|
|
|
244
|
|
366
|
245 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
|
|
|
246 "smtp greeting for \"%V\"", &s->host);
|
|
|
247
|
|
336
|
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
|
|
439
|
254 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
|
|
336
|
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
|
|
439
|
296 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
|
|
336
|
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
|
|
429
|
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
|
|
336
|
454 case NGX_SMTP_NOOP:
|
|
|
455 break;
|
|
|
456
|
|
|
457 case NGX_SMTP_STARTTLS:
|
|
|
458 rc = ngx_mail_smtp_starttls(s, c);
|
|
358
|
459 s->out.len = sizeof(smtp_starttls) - 1;
|
|
|
460 s->out.data = smtp_starttls;
|
|
336
|
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:
|
|
453
|
471 rc = ngx_mail_auth_login_username(s, c, 0);
|
|
336
|
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
|
|
382
|
542 s->smtp_helo.data = ngx_pnalloc(c->pool, arg[0].len);
|
|
336
|
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
|
|
429
|
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
|
|
336
|
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) {
|
|
356
|
565 ngx_mail_ssl_conf_t *sslcf;
|
|
|
566
|
|
336
|
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
|
|
453
|
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
|
|
336
|
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 {
|
|
429
|
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 }
|
|
336
|
731
|
|
429
|
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;
|
|
336
|
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;
|
|
429
|
819 s->smtp_from.len = 0;
|
|
|
820 s->smtp_from.data = NULL;
|
|
|
821 s->smtp_to.len = 0;
|
|
|
822 s->smtp_to.data = NULL;
|
|
336
|
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) {
|
|
439
|
853 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
|
|
336
|
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 }
|
