290
|
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_event_connect.h>
|
|
11 #include <ngx_mail.h>
|
|
12
|
|
13
|
|
14 typedef struct {
|
|
15 ngx_flag_t enable;
|
|
16 ngx_flag_t pass_error_message;
|
|
17 ngx_flag_t xclient;
|
|
18 size_t buffer_size;
|
|
19 ngx_msec_t timeout;
|
|
20 } ngx_mail_proxy_conf_t;
|
|
21
|
|
22
|
|
23 static void ngx_mail_proxy_block_read(ngx_event_t *rev);
|
|
24 static void ngx_mail_proxy_pop3_handler(ngx_event_t *rev);
|
|
25 static void ngx_mail_proxy_imap_handler(ngx_event_t *rev);
|
|
26 static void ngx_mail_proxy_smtp_handler(ngx_event_t *rev);
|
|
27 static void ngx_mail_proxy_dummy_handler(ngx_event_t *ev);
|
|
28 static ngx_int_t ngx_mail_proxy_read_response(ngx_mail_session_t *s,
|
|
29 ngx_uint_t state);
|
|
30 static void ngx_mail_proxy_handler(ngx_event_t *ev);
|
|
31 static void ngx_mail_proxy_upstream_error(ngx_mail_session_t *s);
|
|
32 static void ngx_mail_proxy_internal_server_error(ngx_mail_session_t *s);
|
|
33 static void ngx_mail_proxy_close_session(ngx_mail_session_t *s);
|
|
34 static void *ngx_mail_proxy_create_conf(ngx_conf_t *cf);
|
|
35 static char *ngx_mail_proxy_merge_conf(ngx_conf_t *cf, void *parent,
|
|
36 void *child);
|
|
37
|
|
38
|
|
39 static ngx_command_t ngx_mail_proxy_commands[] = {
|
|
40
|
|
41 { ngx_string("proxy"),
|
|
42 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
|
|
43 ngx_conf_set_flag_slot,
|
|
44 NGX_MAIL_SRV_CONF_OFFSET,
|
|
45 offsetof(ngx_mail_proxy_conf_t, enable),
|
|
46 NULL },
|
|
47
|
|
48 { ngx_string("proxy_buffer"),
|
|
49 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
|
|
50 ngx_conf_set_size_slot,
|
|
51 NGX_MAIL_SRV_CONF_OFFSET,
|
|
52 offsetof(ngx_mail_proxy_conf_t, buffer_size),
|
|
53 NULL },
|
|
54
|
|
55 { ngx_string("proxy_timeout"),
|
|
56 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
|
|
57 ngx_conf_set_msec_slot,
|
|
58 NGX_MAIL_SRV_CONF_OFFSET,
|
|
59 offsetof(ngx_mail_proxy_conf_t, timeout),
|
|
60 NULL },
|
|
61
|
|
62 { ngx_string("proxy_pass_error_message"),
|
|
63 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
|
|
64 ngx_conf_set_flag_slot,
|
|
65 NGX_MAIL_SRV_CONF_OFFSET,
|
|
66 offsetof(ngx_mail_proxy_conf_t, pass_error_message),
|
|
67 NULL },
|
|
68
|
|
69 { ngx_string("xclient"),
|
|
70 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
|
|
71 ngx_conf_set_flag_slot,
|
|
72 NGX_MAIL_SRV_CONF_OFFSET,
|
|
73 offsetof(ngx_mail_proxy_conf_t, xclient),
|
|
74 NULL },
|
|
75
|
|
76 ngx_null_command
|
|
77 };
|
|
78
|
|
79
|
|
80 static ngx_mail_module_t ngx_mail_proxy_module_ctx = {
|
336
|
81 NULL, /* protocol */
|
|
82
|
290
|
83 NULL, /* create main configuration */
|
|
84 NULL, /* init main configuration */
|
|
85
|
|
86 ngx_mail_proxy_create_conf, /* create server configuration */
|
|
87 ngx_mail_proxy_merge_conf /* merge server configuration */
|
|
88 };
|
|
89
|
|
90
|
|
91 ngx_module_t ngx_mail_proxy_module = {
|
|
92 NGX_MODULE_V1,
|
|
93 &ngx_mail_proxy_module_ctx, /* module context */
|
|
94 ngx_mail_proxy_commands, /* module directives */
|
|
95 NGX_MAIL_MODULE, /* module type */
|
|
96 NULL, /* init master */
|
|
97 NULL, /* init module */
|
|
98 NULL, /* init process */
|
|
99 NULL, /* init thread */
|
|
100 NULL, /* exit thread */
|
|
101 NULL, /* exit process */
|
|
102 NULL, /* exit master */
|
|
103 NGX_MODULE_V1_PADDING
|
|
104 };
|
|
105
|
|
106
|
473
|
107 static u_char smtp_auth_ok[] = "235 2.0.0 OK" CRLF;
|
290
|
108
|
|
109
|
|
110 void
|
|
111 ngx_mail_proxy_init(ngx_mail_session_t *s, ngx_peer_addr_t *peer)
|
|
112 {
|
|
113 int keepalive;
|
|
114 ngx_int_t rc;
|
|
115 ngx_mail_proxy_ctx_t *p;
|
|
116 ngx_mail_proxy_conf_t *pcf;
|
|
117 ngx_mail_core_srv_conf_t *cscf;
|
|
118
|
|
119 s->connection->log->action = "connecting to upstream";
|
|
120
|
|
121 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
122
|
|
123 if (cscf->so_keepalive) {
|
|
124 keepalive = 1;
|
|
125
|
|
126 if (setsockopt(s->connection->fd, SOL_SOCKET, SO_KEEPALIVE,
|
|
127 (const void *) &keepalive, sizeof(int))
|
|
128 == -1)
|
|
129 {
|
|
130 ngx_log_error(NGX_LOG_ALERT, s->connection->log, ngx_socket_errno,
|
|
131 "setsockopt(SO_KEEPALIVE) failed");
|
|
132 }
|
|
133 }
|
|
134
|
|
135 p = ngx_pcalloc(s->connection->pool, sizeof(ngx_mail_proxy_ctx_t));
|
|
136 if (p == NULL) {
|
|
137 ngx_mail_session_internal_server_error(s);
|
|
138 return;
|
|
139 }
|
|
140
|
|
141 s->proxy = p;
|
|
142
|
|
143 p->upstream.sockaddr = peer->sockaddr;
|
|
144 p->upstream.socklen = peer->socklen;
|
|
145 p->upstream.name = &peer->name;
|
|
146 p->upstream.get = ngx_event_get_peer;
|
|
147 p->upstream.log = s->connection->log;
|
|
148 p->upstream.log_error = NGX_ERROR_ERR;
|
|
149
|
|
150 rc = ngx_event_connect_peer(&p->upstream);
|
|
151
|
|
152 if (rc == NGX_ERROR || rc == NGX_BUSY || rc == NGX_DECLINED) {
|
|
153 ngx_mail_proxy_internal_server_error(s);
|
|
154 return;
|
|
155 }
|
|
156
|
|
157 ngx_add_timer(p->upstream.connection->read, cscf->timeout);
|
|
158
|
|
159 p->upstream.connection->data = s;
|
|
160 p->upstream.connection->pool = s->connection->pool;
|
|
161
|
|
162 s->connection->read->handler = ngx_mail_proxy_block_read;
|
|
163 p->upstream.connection->write->handler = ngx_mail_proxy_dummy_handler;
|
|
164
|
|
165 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
166
|
|
167 s->proxy->buffer = ngx_create_temp_buf(s->connection->pool,
|
|
168 pcf->buffer_size);
|
|
169 if (s->proxy->buffer == NULL) {
|
|
170 ngx_mail_proxy_internal_server_error(s);
|
|
171 return;
|
|
172 }
|
|
173
|
372
|
174 s->out.len = 0;
|
|
175
|
290
|
176 switch (s->protocol) {
|
|
177
|
|
178 case NGX_MAIL_POP3_PROTOCOL:
|
|
179 p->upstream.connection->read->handler = ngx_mail_proxy_pop3_handler;
|
|
180 s->mail_state = ngx_pop3_start;
|
|
181 break;
|
|
182
|
|
183 case NGX_MAIL_IMAP_PROTOCOL:
|
|
184 p->upstream.connection->read->handler = ngx_mail_proxy_imap_handler;
|
|
185 s->mail_state = ngx_imap_start;
|
|
186 break;
|
|
187
|
|
188 default: /* NGX_MAIL_SMTP_PROTOCOL */
|
|
189 p->upstream.connection->read->handler = ngx_mail_proxy_smtp_handler;
|
|
190 s->mail_state = ngx_smtp_start;
|
|
191 break;
|
|
192 }
|
|
193 }
|
|
194
|
|
195
|
|
196 static void
|
|
197 ngx_mail_proxy_block_read(ngx_event_t *rev)
|
|
198 {
|
|
199 ngx_connection_t *c;
|
|
200 ngx_mail_session_t *s;
|
|
201
|
|
202 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy block read");
|
|
203
|
459
|
204 if (ngx_handle_read_event(rev, 0) != NGX_OK) {
|
290
|
205 c = rev->data;
|
|
206 s = c->data;
|
|
207
|
|
208 ngx_mail_proxy_close_session(s);
|
|
209 }
|
|
210 }
|
|
211
|
|
212
|
|
213 static void
|
|
214 ngx_mail_proxy_pop3_handler(ngx_event_t *rev)
|
|
215 {
|
|
216 u_char *p;
|
|
217 ngx_int_t rc;
|
|
218 ngx_str_t line;
|
|
219 ngx_connection_t *c;
|
|
220 ngx_mail_session_t *s;
|
|
221 ngx_mail_proxy_conf_t *pcf;
|
|
222
|
|
223 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
224 "mail proxy pop3 auth handler");
|
|
225
|
|
226 c = rev->data;
|
|
227 s = c->data;
|
|
228
|
|
229 if (rev->timedout) {
|
|
230 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
231 "upstream timed out");
|
|
232 c->timedout = 1;
|
|
233 ngx_mail_proxy_internal_server_error(s);
|
|
234 return;
|
|
235 }
|
|
236
|
|
237 rc = ngx_mail_proxy_read_response(s, 0);
|
|
238
|
|
239 if (rc == NGX_AGAIN) {
|
|
240 return;
|
|
241 }
|
|
242
|
|
243 if (rc == NGX_ERROR) {
|
|
244 ngx_mail_proxy_upstream_error(s);
|
|
245 return;
|
|
246 }
|
|
247
|
|
248 switch (s->mail_state) {
|
|
249
|
|
250 case ngx_pop3_start:
|
|
251 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send user");
|
|
252
|
|
253 s->connection->log->action = "sending user name to upstream";
|
|
254
|
|
255 line.len = sizeof("USER ") - 1 + s->login.len + 2;
|
382
|
256 line.data = ngx_pnalloc(c->pool, line.len);
|
290
|
257 if (line.data == NULL) {
|
|
258 ngx_mail_proxy_internal_server_error(s);
|
|
259 return;
|
|
260 }
|
|
261
|
|
262 p = ngx_cpymem(line.data, "USER ", sizeof("USER ") - 1);
|
|
263 p = ngx_cpymem(p, s->login.data, s->login.len);
|
|
264 *p++ = CR; *p = LF;
|
|
265
|
|
266 s->mail_state = ngx_pop3_user;
|
|
267 break;
|
|
268
|
|
269 case ngx_pop3_user:
|
|
270 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send pass");
|
|
271
|
|
272 s->connection->log->action = "sending password to upstream";
|
|
273
|
|
274 line.len = sizeof("PASS ") - 1 + s->passwd.len + 2;
|
382
|
275 line.data = ngx_pnalloc(c->pool, line.len);
|
290
|
276 if (line.data == NULL) {
|
|
277 ngx_mail_proxy_internal_server_error(s);
|
|
278 return;
|
|
279 }
|
|
280
|
|
281 p = ngx_cpymem(line.data, "PASS ", sizeof("PASS ") - 1);
|
|
282 p = ngx_cpymem(p, s->passwd.data, s->passwd.len);
|
|
283 *p++ = CR; *p = LF;
|
|
284
|
|
285 s->mail_state = ngx_pop3_passwd;
|
|
286 break;
|
|
287
|
|
288 case ngx_pop3_passwd:
|
|
289 s->connection->read->handler = ngx_mail_proxy_handler;
|
|
290 s->connection->write->handler = ngx_mail_proxy_handler;
|
|
291 rev->handler = ngx_mail_proxy_handler;
|
|
292 c->write->handler = ngx_mail_proxy_handler;
|
|
293
|
|
294 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
295 ngx_add_timer(s->connection->read, pcf->timeout);
|
|
296 ngx_del_timer(c->read);
|
|
297
|
|
298 c->log->action = NULL;
|
|
299 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
|
|
300
|
|
301 ngx_mail_proxy_handler(s->connection->write);
|
|
302
|
|
303 return;
|
|
304
|
|
305 default:
|
|
306 #if (NGX_SUPPRESS_WARN)
|
|
307 line.len = 0;
|
|
308 line.data = NULL;
|
|
309 #endif
|
|
310 break;
|
|
311 }
|
|
312
|
|
313 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
|
|
314 /*
|
|
315 * we treat the incomplete sending as NGX_ERROR
|
|
316 * because it is very strange here
|
|
317 */
|
|
318 ngx_mail_proxy_internal_server_error(s);
|
|
319 return;
|
|
320 }
|
|
321
|
|
322 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
323 s->proxy->buffer->last = s->proxy->buffer->start;
|
|
324 }
|
|
325
|
|
326
|
|
327 static void
|
|
328 ngx_mail_proxy_imap_handler(ngx_event_t *rev)
|
|
329 {
|
|
330 u_char *p;
|
|
331 ngx_int_t rc;
|
|
332 ngx_str_t line;
|
|
333 ngx_connection_t *c;
|
|
334 ngx_mail_session_t *s;
|
|
335 ngx_mail_proxy_conf_t *pcf;
|
|
336
|
|
337 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
338 "mail proxy imap auth handler");
|
|
339
|
|
340 c = rev->data;
|
|
341 s = c->data;
|
|
342
|
|
343 if (rev->timedout) {
|
|
344 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
345 "upstream timed out");
|
|
346 c->timedout = 1;
|
|
347 ngx_mail_proxy_internal_server_error(s);
|
|
348 return;
|
|
349 }
|
|
350
|
|
351 rc = ngx_mail_proxy_read_response(s, s->mail_state);
|
|
352
|
|
353 if (rc == NGX_AGAIN) {
|
|
354 return;
|
|
355 }
|
|
356
|
|
357 if (rc == NGX_ERROR) {
|
|
358 ngx_mail_proxy_upstream_error(s);
|
|
359 return;
|
|
360 }
|
|
361
|
|
362 switch (s->mail_state) {
|
|
363
|
|
364 case ngx_imap_start:
|
|
365 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
366 "mail proxy send login");
|
|
367
|
|
368 s->connection->log->action = "sending LOGIN command to upstream";
|
|
369
|
|
370 line.len = s->tag.len + sizeof("LOGIN ") - 1
|
|
371 + 1 + NGX_SIZE_T_LEN + 1 + 2;
|
382
|
372 line.data = ngx_pnalloc(c->pool, line.len);
|
290
|
373 if (line.data == NULL) {
|
|
374 ngx_mail_proxy_internal_server_error(s);
|
|
375 return;
|
|
376 }
|
|
377
|
|
378 line.len = ngx_sprintf(line.data, "%VLOGIN {%uz}" CRLF,
|
|
379 &s->tag, s->login.len)
|
|
380 - line.data;
|
|
381
|
|
382 s->mail_state = ngx_imap_login;
|
|
383 break;
|
|
384
|
|
385 case ngx_imap_login:
|
|
386 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send user");
|
|
387
|
|
388 s->connection->log->action = "sending user name to upstream";
|
|
389
|
|
390 line.len = s->login.len + 1 + 1 + NGX_SIZE_T_LEN + 1 + 2;
|
382
|
391 line.data = ngx_pnalloc(c->pool, line.len);
|
290
|
392 if (line.data == NULL) {
|
|
393 ngx_mail_proxy_internal_server_error(s);
|
|
394 return;
|
|
395 }
|
|
396
|
|
397 line.len = ngx_sprintf(line.data, "%V {%uz}" CRLF,
|
|
398 &s->login, s->passwd.len)
|
|
399 - line.data;
|
|
400
|
|
401 s->mail_state = ngx_imap_user;
|
|
402 break;
|
|
403
|
|
404 case ngx_imap_user:
|
|
405 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
406 "mail proxy send passwd");
|
|
407
|
|
408 s->connection->log->action = "sending password to upstream";
|
|
409
|
|
410 line.len = s->passwd.len + 2;
|
382
|
411 line.data = ngx_pnalloc(c->pool, line.len);
|
290
|
412 if (line.data == NULL) {
|
|
413 ngx_mail_proxy_internal_server_error(s);
|
|
414 return;
|
|
415 }
|
|
416
|
|
417 p = ngx_cpymem(line.data, s->passwd.data, s->passwd.len);
|
|
418 *p++ = CR; *p = LF;
|
|
419
|
|
420 s->mail_state = ngx_imap_passwd;
|
|
421 break;
|
|
422
|
|
423 case ngx_imap_passwd:
|
|
424 s->connection->read->handler = ngx_mail_proxy_handler;
|
|
425 s->connection->write->handler = ngx_mail_proxy_handler;
|
|
426 rev->handler = ngx_mail_proxy_handler;
|
|
427 c->write->handler = ngx_mail_proxy_handler;
|
|
428
|
|
429 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
430 ngx_add_timer(s->connection->read, pcf->timeout);
|
|
431 ngx_del_timer(c->read);
|
|
432
|
|
433 c->log->action = NULL;
|
|
434 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
|
|
435
|
|
436 ngx_mail_proxy_handler(s->connection->write);
|
|
437
|
|
438 return;
|
|
439
|
|
440 default:
|
|
441 #if (NGX_SUPPRESS_WARN)
|
|
442 line.len = 0;
|
|
443 line.data = NULL;
|
|
444 #endif
|
|
445 break;
|
|
446 }
|
|
447
|
|
448 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
|
|
449 /*
|
|
450 * we treat the incomplete sending as NGX_ERROR
|
|
451 * because it is very strange here
|
|
452 */
|
|
453 ngx_mail_proxy_internal_server_error(s);
|
|
454 return;
|
|
455 }
|
|
456
|
|
457 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
458 s->proxy->buffer->last = s->proxy->buffer->start;
|
|
459 }
|
|
460
|
|
461
|
|
462 static void
|
|
463 ngx_mail_proxy_smtp_handler(ngx_event_t *rev)
|
|
464 {
|
|
465 u_char *p;
|
|
466 ngx_int_t rc;
|
|
467 ngx_str_t line;
|
449
|
468 ngx_buf_t *b;
|
290
|
469 ngx_connection_t *c;
|
|
470 ngx_mail_session_t *s;
|
|
471 ngx_mail_proxy_conf_t *pcf;
|
|
472 ngx_mail_core_srv_conf_t *cscf;
|
|
473
|
|
474 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
475 "mail proxy smtp auth handler");
|
|
476
|
|
477 c = rev->data;
|
|
478 s = c->data;
|
|
479
|
|
480 if (rev->timedout) {
|
|
481 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
482 "upstream timed out");
|
|
483 c->timedout = 1;
|
|
484 ngx_mail_proxy_internal_server_error(s);
|
|
485 return;
|
|
486 }
|
|
487
|
|
488 rc = ngx_mail_proxy_read_response(s, s->mail_state);
|
|
489
|
|
490 if (rc == NGX_AGAIN) {
|
|
491 return;
|
|
492 }
|
|
493
|
|
494 if (rc == NGX_ERROR) {
|
|
495 ngx_mail_proxy_upstream_error(s);
|
|
496 return;
|
|
497 }
|
|
498
|
|
499 switch (s->mail_state) {
|
|
500
|
|
501 case ngx_smtp_start:
|
|
502 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send ehlo");
|
|
503
|
|
504 s->connection->log->action = "sending HELO/EHLO to upstream";
|
|
505
|
|
506 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
507
|
|
508 line.len = sizeof("HELO ") - 1 + cscf->server_name.len + 2;
|
382
|
509 line.data = ngx_pnalloc(c->pool, line.len);
|
290
|
510 if (line.data == NULL) {
|
|
511 ngx_mail_proxy_internal_server_error(s);
|
|
512 return;
|
|
513 }
|
|
514
|
|
515 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
516
|
|
517 p = ngx_cpymem(line.data,
|
|
518 ((s->esmtp || pcf->xclient) ? "EHLO " : "HELO "),
|
|
519 sizeof("HELO ") - 1);
|
|
520
|
|
521 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
|
|
522 *p++ = CR; *p = LF;
|
|
523
|
449
|
524 if (pcf->xclient) {
|
|
525 s->mail_state = ngx_smtp_helo_xclient;
|
|
526
|
|
527 } else if (s->auth_method == NGX_MAIL_AUTH_NONE) {
|
|
528 s->mail_state = ngx_smtp_helo_from;
|
|
529
|
|
530 } else {
|
|
531 s->mail_state = ngx_smtp_helo;
|
|
532 }
|
290
|
533
|
|
534 break;
|
|
535
|
449
|
536 case ngx_smtp_helo_xclient:
|
290
|
537 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
538 "mail proxy send xclient");
|
|
539
|
|
540 s->connection->log->action = "sending XCLIENT to upstream";
|
|
541
|
366
|
542 line.len = sizeof("XCLIENT PROTO=SMTP HELO= ADDR= LOGIN= NAME="
|
|
543 CRLF) - 1
|
290
|
544 + s->esmtp + s->smtp_helo.len
|
366
|
545 + s->connection->addr_text.len + s->login.len + s->host.len;
|
290
|
546
|
382
|
547 line.data = ngx_pnalloc(c->pool, line.len);
|
290
|
548 if (line.data == NULL) {
|
|
549 ngx_mail_proxy_internal_server_error(s);
|
|
550 return;
|
|
551 }
|
|
552
|
449
|
553 line.len = ngx_sprintf(line.data,
|
|
554 "XCLIENT PROTO=%sSMTP%s%V ADDR=%V%s%V NAME=%V" CRLF,
|
|
555 (s->esmtp ? "E" : ""),
|
|
556 (s->smtp_helo.len ? " HELO=" : ""), &s->smtp_helo,
|
|
557 &s->connection->addr_text,
|
|
558 (s->login.len ? " LOGIN=" : ""), &s->login, &s->host)
|
|
559 - line.data;
|
|
560
|
|
561 s->mail_state = (s->auth_method == NGX_MAIL_AUTH_NONE) ?
|
|
562 ngx_smtp_xclient_from : ngx_smtp_xclient;
|
|
563
|
|
564 break;
|
|
565
|
|
566 case ngx_smtp_helo_from:
|
|
567 case ngx_smtp_xclient_from:
|
|
568 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
569 "mail proxy send mail from");
|
|
570
|
|
571 s->connection->log->action = "sending MAIL FROM to upstream";
|
|
572
|
|
573 line.len = s->smtp_from.len + sizeof(CRLF) - 1;
|
|
574 line.data = ngx_pnalloc(c->pool, line.len);
|
|
575 if (line.data == NULL) {
|
|
576 ngx_mail_proxy_internal_server_error(s);
|
|
577 return;
|
290
|
578 }
|
|
579
|
449
|
580 p = ngx_cpymem(line.data, s->smtp_from.data, s->smtp_from.len);
|
|
581 *p++ = CR; *p = LF;
|
|
582
|
|
583 s->mail_state = ngx_smtp_from;
|
|
584
|
290
|
585 break;
|
|
586
|
449
|
587 case ngx_smtp_from:
|
|
588 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
589 "mail proxy send rcpt to");
|
|
590
|
|
591 s->connection->log->action = "sending RCPT TO to upstream";
|
|
592
|
|
593 line.len = s->smtp_to.len + sizeof(CRLF) - 1;
|
|
594 line.data = ngx_pnalloc(c->pool, line.len);
|
|
595 if (line.data == NULL) {
|
|
596 ngx_mail_proxy_internal_server_error(s);
|
|
597 return;
|
|
598 }
|
|
599
|
|
600 p = ngx_cpymem(line.data, s->smtp_to.data, s->smtp_to.len);
|
|
601 *p++ = CR; *p = LF;
|
290
|
602
|
449
|
603 s->mail_state = ngx_smtp_to;
|
|
604
|
|
605 break;
|
|
606
|
|
607 case ngx_smtp_helo:
|
|
608 case ngx_smtp_xclient:
|
|
609 case ngx_smtp_to:
|
290
|
610
|
449
|
611 b = s->proxy->buffer;
|
|
612
|
|
613 if (s->auth_method == NGX_MAIL_AUTH_NONE) {
|
|
614 b->pos = b->start;
|
|
615
|
|
616 } else {
|
473
|
617 ngx_memcpy(b->start, smtp_auth_ok, sizeof(smtp_auth_ok) - 1);
|
|
618 b->last = b->start + sizeof(smtp_auth_ok) - 1;
|
449
|
619 }
|
290
|
620
|
|
621 s->connection->read->handler = ngx_mail_proxy_handler;
|
|
622 s->connection->write->handler = ngx_mail_proxy_handler;
|
|
623 rev->handler = ngx_mail_proxy_handler;
|
|
624 c->write->handler = ngx_mail_proxy_handler;
|
|
625
|
|
626 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
627 ngx_add_timer(s->connection->read, pcf->timeout);
|
|
628 ngx_del_timer(c->read);
|
|
629
|
|
630 c->log->action = NULL;
|
|
631 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
|
|
632
|
|
633 ngx_mail_proxy_handler(s->connection->write);
|
|
634
|
|
635 return;
|
|
636
|
|
637 default:
|
|
638 #if (NGX_SUPPRESS_WARN)
|
|
639 line.len = 0;
|
|
640 line.data = NULL;
|
|
641 #endif
|
|
642 break;
|
|
643 }
|
|
644
|
|
645 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
|
|
646 /*
|
|
647 * we treat the incomplete sending as NGX_ERROR
|
|
648 * because it is very strange here
|
|
649 */
|
|
650 ngx_mail_proxy_internal_server_error(s);
|
|
651 return;
|
|
652 }
|
|
653
|
|
654 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
655 s->proxy->buffer->last = s->proxy->buffer->start;
|
|
656 }
|
|
657
|
|
658
|
|
659 static void
|
|
660 ngx_mail_proxy_dummy_handler(ngx_event_t *wev)
|
|
661 {
|
|
662 ngx_connection_t *c;
|
|
663 ngx_mail_session_t *s;
|
|
664
|
|
665 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, wev->log, 0, "mail proxy dummy handler");
|
|
666
|
459
|
667 if (ngx_handle_write_event(wev, 0) != NGX_OK) {
|
290
|
668 c = wev->data;
|
|
669 s = c->data;
|
|
670
|
|
671 ngx_mail_proxy_close_session(s);
|
|
672 }
|
|
673 }
|
|
674
|
|
675
|
|
676 static ngx_int_t
|
|
677 ngx_mail_proxy_read_response(ngx_mail_session_t *s, ngx_uint_t state)
|
|
678 {
|
|
679 u_char *p;
|
|
680 ssize_t n;
|
|
681 ngx_buf_t *b;
|
|
682 ngx_mail_proxy_conf_t *pcf;
|
|
683
|
|
684 s->connection->log->action = "reading response from upstream";
|
|
685
|
|
686 b = s->proxy->buffer;
|
|
687
|
|
688 n = s->proxy->upstream.connection->recv(s->proxy->upstream.connection,
|
|
689 b->last, b->end - b->last);
|
|
690
|
|
691 if (n == NGX_ERROR || n == 0) {
|
|
692 return NGX_ERROR;
|
|
693 }
|
|
694
|
|
695 if (n == NGX_AGAIN) {
|
|
696 return NGX_AGAIN;
|
|
697 }
|
|
698
|
|
699 b->last += n;
|
|
700
|
|
701 if (b->last - b->pos < 5) {
|
|
702 return NGX_AGAIN;
|
|
703 }
|
|
704
|
|
705 if (*(b->last - 2) != CR || *(b->last - 1) != LF) {
|
|
706 if (b->last == b->end) {
|
|
707 *(b->last - 1) = '\0';
|
|
708 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
709 "upstream sent too long response line: \"%s\"",
|
|
710 b->pos);
|
|
711 return NGX_ERROR;
|
|
712 }
|
|
713
|
|
714 return NGX_AGAIN;
|
|
715 }
|
|
716
|
|
717 p = b->pos;
|
|
718
|
|
719 switch (s->protocol) {
|
|
720
|
|
721 case NGX_MAIL_POP3_PROTOCOL:
|
|
722 if (p[0] == '+' && p[1] == 'O' && p[2] == 'K') {
|
|
723 return NGX_OK;
|
|
724 }
|
|
725 break;
|
|
726
|
|
727 case NGX_MAIL_IMAP_PROTOCOL:
|
|
728 switch (state) {
|
|
729
|
|
730 case ngx_imap_start:
|
|
731 if (p[0] == '*' && p[1] == ' ' && p[2] == 'O' && p[3] == 'K') {
|
|
732 return NGX_OK;
|
|
733 }
|
|
734 break;
|
|
735
|
|
736 case ngx_imap_login:
|
|
737 case ngx_imap_user:
|
|
738 if (p[0] == '+') {
|
|
739 return NGX_OK;
|
|
740 }
|
|
741 break;
|
|
742
|
|
743 case ngx_imap_passwd:
|
|
744 if (ngx_strncmp(p, s->tag.data, s->tag.len) == 0) {
|
|
745 p += s->tag.len;
|
|
746 if (p[0] == 'O' && p[1] == 'K') {
|
|
747 return NGX_OK;
|
|
748 }
|
|
749 }
|
|
750 break;
|
|
751 }
|
|
752
|
|
753 break;
|
|
754
|
|
755 default: /* NGX_MAIL_SMTP_PROTOCOL */
|
|
756 switch (state) {
|
|
757
|
449
|
758 case ngx_smtp_start:
|
|
759 if (p[0] == '2' && p[1] == '2' && p[2] == '0') {
|
|
760 return NGX_OK;
|
|
761 }
|
|
762 break;
|
|
763
|
290
|
764 case ngx_smtp_helo:
|
449
|
765 case ngx_smtp_helo_xclient:
|
|
766 case ngx_smtp_helo_from:
|
|
767 case ngx_smtp_from:
|
296
|
768 if (p[0] == '2' && p[1] == '5' && p[2] == '0') {
|
|
769 return NGX_OK;
|
|
770 }
|
|
771 break;
|
290
|
772
|
|
773 case ngx_smtp_xclient:
|
449
|
774 case ngx_smtp_xclient_from:
|
|
775 if (p[0] == '2' && (p[1] == '2' || p[1] == '5') && p[2] == '0') {
|
296
|
776 return NGX_OK;
|
|
777 }
|
|
778 break;
|
449
|
779
|
|
780 case ngx_smtp_to:
|
|
781 return NGX_OK;
|
290
|
782 }
|
|
783
|
296
|
784 break;
|
290
|
785 }
|
|
786
|
|
787 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
788
|
|
789 if (pcf->pass_error_message == 0) {
|
|
790 *(b->last - 2) = '\0';
|
|
791 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
792 "upstream sent invalid response: \"%s\"", p);
|
|
793 return NGX_ERROR;
|
|
794 }
|
|
795
|
|
796 s->out.len = b->last - p - 2;
|
|
797 s->out.data = p;
|
|
798
|
|
799 ngx_log_error(NGX_LOG_INFO, s->connection->log, 0,
|
|
800 "upstream sent invalid response: \"%V\"", &s->out);
|
|
801
|
|
802 s->out.len = b->last - b->pos;
|
|
803 s->out.data = b->pos;
|
|
804
|
|
805 return NGX_ERROR;
|
|
806 }
|
|
807
|
|
808
|
|
809 static void
|
|
810 ngx_mail_proxy_handler(ngx_event_t *ev)
|
|
811 {
|
|
812 char *action, *recv_action, *send_action;
|
|
813 size_t size;
|
|
814 ssize_t n;
|
|
815 ngx_buf_t *b;
|
|
816 ngx_uint_t do_write;
|
|
817 ngx_connection_t *c, *src, *dst;
|
|
818 ngx_mail_session_t *s;
|
|
819 ngx_mail_proxy_conf_t *pcf;
|
|
820
|
|
821 c = ev->data;
|
|
822 s = c->data;
|
|
823
|
|
824 if (ev->timedout) {
|
|
825 c->log->action = "proxying";
|
|
826
|
|
827 if (c == s->connection) {
|
|
828 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
829 "client timed out");
|
|
830 c->timedout = 1;
|
|
831
|
|
832 } else {
|
|
833 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
834 "upstream timed out");
|
|
835 }
|
|
836
|
|
837 ngx_mail_proxy_close_session(s);
|
|
838 return;
|
|
839 }
|
|
840
|
|
841 if (c == s->connection) {
|
|
842 if (ev->write) {
|
|
843 recv_action = "proxying and reading from upstream";
|
|
844 send_action = "proxying and sending to client";
|
|
845 src = s->proxy->upstream.connection;
|
|
846 dst = c;
|
|
847 b = s->proxy->buffer;
|
|
848
|
|
849 } else {
|
|
850 recv_action = "proxying and reading from client";
|
|
851 send_action = "proxying and sending to upstream";
|
|
852 src = c;
|
|
853 dst = s->proxy->upstream.connection;
|
|
854 b = s->buffer;
|
|
855 }
|
|
856
|
|
857 } else {
|
|
858 if (ev->write) {
|
|
859 recv_action = "proxying and reading from client";
|
|
860 send_action = "proxying and sending to upstream";
|
|
861 src = s->connection;
|
|
862 dst = c;
|
|
863 b = s->buffer;
|
|
864
|
|
865 } else {
|
|
866 recv_action = "proxying and reading from upstream";
|
|
867 send_action = "proxying and sending to client";
|
|
868 src = c;
|
|
869 dst = s->connection;
|
|
870 b = s->proxy->buffer;
|
|
871 }
|
|
872 }
|
|
873
|
|
874 do_write = ev->write ? 1 : 0;
|
|
875
|
|
876 ngx_log_debug3(NGX_LOG_DEBUG_MAIL, ev->log, 0,
|
|
877 "mail proxy handler: %d, #%d > #%d",
|
|
878 do_write, src->fd, dst->fd);
|
|
879
|
|
880 for ( ;; ) {
|
|
881
|
|
882 if (do_write) {
|
|
883
|
|
884 size = b->last - b->pos;
|
|
885
|
|
886 if (size && dst->write->ready) {
|
|
887 c->log->action = send_action;
|
|
888
|
|
889 n = dst->send(dst, b->pos, size);
|
|
890
|
|
891 if (n == NGX_ERROR) {
|
|
892 ngx_mail_proxy_close_session(s);
|
|
893 return;
|
|
894 }
|
|
895
|
|
896 if (n > 0) {
|
|
897 b->pos += n;
|
|
898
|
|
899 if (b->pos == b->last) {
|
|
900 b->pos = b->start;
|
|
901 b->last = b->start;
|
|
902 }
|
|
903 }
|
|
904 }
|
|
905 }
|
|
906
|
|
907 size = b->end - b->last;
|
|
908
|
|
909 if (size && src->read->ready) {
|
|
910 c->log->action = recv_action;
|
|
911
|
|
912 n = src->recv(src, b->last, size);
|
|
913
|
|
914 if (n == NGX_AGAIN || n == 0) {
|
|
915 break;
|
|
916 }
|
|
917
|
|
918 if (n > 0) {
|
|
919 do_write = 1;
|
|
920 b->last += n;
|
|
921
|
|
922 continue;
|
|
923 }
|
|
924
|
|
925 if (n == NGX_ERROR) {
|
|
926 src->read->eof = 1;
|
|
927 }
|
|
928 }
|
|
929
|
|
930 break;
|
|
931 }
|
|
932
|
|
933 c->log->action = "proxying";
|
|
934
|
324
|
935 if ((s->connection->read->eof && s->buffer->pos == s->buffer->last)
|
|
936 || (s->proxy->upstream.connection->read->eof
|
|
937 && s->proxy->buffer->pos == s->proxy->buffer->last)
|
|
938 || (s->connection->read->eof
|
|
939 && s->proxy->upstream.connection->read->eof))
|
290
|
940 {
|
|
941 action = c->log->action;
|
|
942 c->log->action = NULL;
|
|
943 ngx_log_error(NGX_LOG_INFO, c->log, 0, "proxied session done");
|
|
944 c->log->action = action;
|
|
945
|
|
946 ngx_mail_proxy_close_session(s);
|
|
947 return;
|
|
948 }
|
|
949
|
459
|
950 if (ngx_handle_write_event(dst->write, 0) != NGX_OK) {
|
290
|
951 ngx_mail_proxy_close_session(s);
|
|
952 return;
|
|
953 }
|
|
954
|
459
|
955 if (ngx_handle_read_event(dst->read, 0) != NGX_OK) {
|
290
|
956 ngx_mail_proxy_close_session(s);
|
|
957 return;
|
|
958 }
|
|
959
|
459
|
960 if (ngx_handle_write_event(src->write, 0) != NGX_OK) {
|
290
|
961 ngx_mail_proxy_close_session(s);
|
|
962 return;
|
|
963 }
|
|
964
|
459
|
965 if (ngx_handle_read_event(src->read, 0) != NGX_OK) {
|
290
|
966 ngx_mail_proxy_close_session(s);
|
|
967 return;
|
|
968 }
|
|
969
|
|
970 if (c == s->connection) {
|
|
971 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
972 ngx_add_timer(c->read, pcf->timeout);
|
|
973 }
|
|
974 }
|
|
975
|
|
976
|
|
977 static void
|
|
978 ngx_mail_proxy_upstream_error(ngx_mail_session_t *s)
|
|
979 {
|
|
980 if (s->proxy->upstream.connection) {
|
|
981 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
982 "close mail proxy connection: %d",
|
|
983 s->proxy->upstream.connection->fd);
|
|
984
|
|
985 ngx_close_connection(s->proxy->upstream.connection);
|
|
986 }
|
|
987
|
|
988 if (s->out.len == 0) {
|
|
989 ngx_mail_session_internal_server_error(s);
|
|
990 return;
|
|
991 }
|
|
992
|
|
993 s->quit = 1;
|
|
994 ngx_mail_send(s->connection->write);
|
|
995 }
|
|
996
|
|
997
|
|
998 static void
|
|
999 ngx_mail_proxy_internal_server_error(ngx_mail_session_t *s)
|
|
1000 {
|
|
1001 if (s->proxy->upstream.connection) {
|
|
1002 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
1003 "close mail proxy connection: %d",
|
|
1004 s->proxy->upstream.connection->fd);
|
|
1005
|
|
1006 ngx_close_connection(s->proxy->upstream.connection);
|
|
1007 }
|
|
1008
|
|
1009 ngx_mail_session_internal_server_error(s);
|
|
1010 }
|
|
1011
|
|
1012
|
|
1013 static void
|
|
1014 ngx_mail_proxy_close_session(ngx_mail_session_t *s)
|
|
1015 {
|
|
1016 if (s->proxy->upstream.connection) {
|
|
1017 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
1018 "close mail proxy connection: %d",
|
|
1019 s->proxy->upstream.connection->fd);
|
|
1020
|
|
1021 ngx_close_connection(s->proxy->upstream.connection);
|
|
1022 }
|
|
1023
|
|
1024 ngx_mail_close_connection(s->connection);
|
|
1025 }
|
|
1026
|
|
1027
|
|
1028 static void *
|
|
1029 ngx_mail_proxy_create_conf(ngx_conf_t *cf)
|
|
1030 {
|
|
1031 ngx_mail_proxy_conf_t *pcf;
|
|
1032
|
|
1033 pcf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_proxy_conf_t));
|
|
1034 if (pcf == NULL) {
|
|
1035 return NGX_CONF_ERROR;
|
|
1036 }
|
|
1037
|
|
1038 pcf->enable = NGX_CONF_UNSET;
|
|
1039 pcf->pass_error_message = NGX_CONF_UNSET;
|
|
1040 pcf->xclient = NGX_CONF_UNSET;
|
|
1041 pcf->buffer_size = NGX_CONF_UNSET_SIZE;
|
|
1042 pcf->timeout = NGX_CONF_UNSET_MSEC;
|
|
1043
|
|
1044 return pcf;
|
|
1045 }
|
|
1046
|
|
1047
|
|
1048 static char *
|
|
1049 ngx_mail_proxy_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
1050 {
|
|
1051 ngx_mail_proxy_conf_t *prev = parent;
|
|
1052 ngx_mail_proxy_conf_t *conf = child;
|
|
1053
|
|
1054 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
1055 ngx_conf_merge_value(conf->pass_error_message, prev->pass_error_message, 0);
|
|
1056 ngx_conf_merge_value(conf->xclient, prev->xclient, 1);
|
|
1057 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size,
|
|
1058 (size_t) ngx_pagesize);
|
|
1059 ngx_conf_merge_msec_value(conf->timeout, prev->timeout, 24 * 60 * 60000);
|
|
1060
|
|
1061 return NGX_CONF_OK;
|
|
1062 }
|