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comparison src/mail/ngx_mail_pop3_handler.c @ 336:1c519aff5c0c NGINX_0_6_12

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nginx 0.6.12 *) Change: mail proxy was split on three modules: pop3, imap and smtp. *) Feature: the --without-mail_pop3_module, --without-mail_imap_module, and --without-mail_smtp_module configuration parameters. *) Feature: the "smtp_greeting_delay" and "smtp_client_buffer" directives of the ngx_mail_smtp_module. *) Bugfix: the trailing wildcards did not work; bug appeared in 0.6.9. *) Bugfix: nginx could not start on Solaris if the shared PCRE library located in non-standard place was used. *) Bugfix: the "proxy_hide_header" and "fastcgi_hide_header" directives did not hide response header lines whose name was longer than 32 characters. Thanks to Manlio Perillo.
author Igor Sysoev <http://sysoev.ru>
date Fri, 21 Sep 2007 00:00:00 +0400
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children b743d290eb3b
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335:9a32ae248b7a 336:1c519aff5c0c
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_pop3_module.h>
12
13
14 static ngx_int_t ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c);
15 static ngx_int_t ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c);
16 static ngx_int_t ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c,
17 ngx_int_t stls);
18 static ngx_int_t ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c);
19 static ngx_int_t ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c);
20 static ngx_int_t ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c);
21
22
23 static u_char pop3_greeting[] = "+OK POP3 ready" CRLF;
24 static u_char pop3_ok[] = "+OK" CRLF;
25 static u_char pop3_next[] = "+ " CRLF;
26 static u_char pop3_username[] = "+ VXNlcm5hbWU6" CRLF;
27 static u_char pop3_password[] = "+ UGFzc3dvcmQ6" CRLF;
28 static u_char pop3_invalid_command[] = "-ERR invalid command" CRLF;
29
30
31 void
32 ngx_mail_pop3_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
33 {
34 u_char *p;
35 ngx_mail_core_srv_conf_t *cscf;
36 ngx_mail_pop3_srv_conf_t *pscf;
37
38 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
39 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
40
41 if (pscf->auth_methods
42 & (NGX_MAIL_AUTH_APOP_ENABLED|NGX_MAIL_AUTH_CRAM_MD5_ENABLED))
43 {
44 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
45 ngx_mail_session_internal_server_error(s);
46 return;
47 }
48
49 s->out.data = ngx_palloc(c->pool, sizeof(pop3_greeting) + s->salt.len);
50 if (s->out.data == NULL) {
51 ngx_mail_session_internal_server_error(s);
52 return;
53 }
54
55 p = ngx_cpymem(s->out.data, pop3_greeting, sizeof(pop3_greeting) - 3);
56 *p++ = ' ';
57 p = ngx_cpymem(p, s->salt.data, s->salt.len);
58
59 s->out.len = p - s->out.data;
60
61 } else {
62 s->out.len = sizeof(pop3_greeting) - 1;
63 s->out.data = pop3_greeting;
64 }
65
66 c->read->handler = ngx_mail_pop3_init_protocol;
67
68 ngx_add_timer(c->read, cscf->timeout);
69
70 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
71 ngx_mail_close_connection(c);
72 }
73
74 ngx_mail_send(c->write);
75 }
76
77
78 void
79 ngx_mail_pop3_init_protocol(ngx_event_t *rev)
80 {
81 ngx_connection_t *c;
82 ngx_mail_session_t *s;
83
84 c = rev->data;
85
86 c->log->action = "in auth state";
87
88 if (rev->timedout) {
89 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
90 c->timedout = 1;
91 ngx_mail_close_connection(c);
92 return;
93 }
94
95 s = c->data;
96
97 if (s->buffer == NULL) {
98 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t))
99 == NGX_ERROR)
100 {
101 ngx_mail_session_internal_server_error(s);
102 return;
103 }
104
105 s->buffer = ngx_create_temp_buf(c->pool, 128);
106 if (s->buffer == NULL) {
107 ngx_mail_session_internal_server_error(s);
108 return;
109 }
110 }
111
112 s->mail_state = ngx_pop3_start;
113 c->read->handler = ngx_mail_pop3_auth_state;
114
115 ngx_mail_pop3_auth_state(rev);
116 }
117
118
119 void
120 ngx_mail_pop3_auth_state(ngx_event_t *rev)
121 {
122 ngx_int_t rc;
123 ngx_connection_t *c;
124 ngx_mail_session_t *s;
125
126 c = rev->data;
127 s = c->data;
128
129 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 auth state");
130
131 if (rev->timedout) {
132 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
133 c->timedout = 1;
134 ngx_mail_close_connection(c);
135 return;
136 }
137
138 if (s->out.len) {
139 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 send handler busy");
140 s->blocked = 1;
141 return;
142 }
143
144 s->blocked = 0;
145
146 rc = ngx_mail_read_command(s, c);
147
148 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
149 return;
150 }
151
152 s->out.len = sizeof(pop3_ok) - 1;
153 s->out.data = pop3_ok;
154
155 if (rc == NGX_OK) {
156 switch (s->mail_state) {
157
158 case ngx_pop3_start:
159
160 switch (s->command) {
161
162 case NGX_POP3_USER:
163 rc = ngx_mail_pop3_user(s, c);
164 break;
165
166 case NGX_POP3_CAPA:
167 rc = ngx_mail_pop3_capa(s, c, 1);
168 break;
169
170 case NGX_POP3_APOP:
171 rc = ngx_mail_pop3_apop(s, c);
172 break;
173
174 case NGX_POP3_AUTH:
175 rc = ngx_mail_pop3_auth(s, c);
176 break;
177
178 case NGX_POP3_QUIT:
179 s->quit = 1;
180 break;
181
182 case NGX_POP3_NOOP:
183 break;
184
185 case NGX_POP3_STLS:
186 rc = ngx_mail_pop3_stls(s, c);
187 break;
188
189 default:
190 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
191 s->mail_state = ngx_pop3_start;
192 break;
193 }
194
195 break;
196
197 case ngx_pop3_user:
198
199 switch (s->command) {
200
201 case NGX_POP3_PASS:
202 rc = ngx_mail_pop3_pass(s, c);
203 break;
204
205 case NGX_POP3_CAPA:
206 rc = ngx_mail_pop3_capa(s, c, 0);
207 break;
208
209 case NGX_POP3_QUIT:
210 s->quit = 1;
211 break;
212
213 case NGX_POP3_NOOP:
214 break;
215
216 default:
217 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
218 s->mail_state = ngx_pop3_start;
219 break;
220 }
221
222 break;
223
224 /* suppress warinings */
225 case ngx_pop3_passwd:
226 break;
227
228 case ngx_pop3_auth_login_username:
229 rc = ngx_mail_auth_login_username(s, c);
230
231 s->out.len = sizeof(pop3_password) - 1;
232 s->out.data = pop3_password;
233 s->mail_state = ngx_pop3_auth_login_password;
234 break;
235
236 case ngx_pop3_auth_login_password:
237 rc = ngx_mail_auth_login_password(s, c);
238 break;
239
240 case ngx_pop3_auth_plain:
241 rc = ngx_mail_auth_plain(s, c, 0);
242 break;
243
244 case ngx_pop3_auth_cram_md5:
245 rc = ngx_mail_auth_cram_md5(s, c);
246 break;
247 }
248 }
249
250 switch (rc) {
251
252 case NGX_DONE:
253 ngx_mail_auth(s, c);
254 return;
255
256 case NGX_ERROR:
257 ngx_mail_session_internal_server_error(s);
258 return;
259
260 case NGX_MAIL_PARSE_INVALID_COMMAND:
261 s->mail_state = ngx_pop3_start;
262 s->state = 0;
263
264 s->out.len = sizeof(pop3_invalid_command) - 1;
265 s->out.data = pop3_invalid_command;
266
267 /* fall through */
268
269 case NGX_OK:
270
271 s->args.nelts = 0;
272 s->buffer->pos = s->buffer->start;
273 s->buffer->last = s->buffer->start;
274
275 if (s->state) {
276 s->arg_start = s->buffer->start;
277 }
278
279 ngx_mail_send(c->write);
280 }
281 }
282
283 static ngx_int_t
284 ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c)
285 {
286 ngx_str_t *arg;
287
288 #if (NGX_MAIL_SSL)
289 if (ngx_mail_starttls_only(s, c)) {
290 return NGX_MAIL_PARSE_INVALID_COMMAND;
291 }
292 #endif
293
294 if (s->args.nelts != 1) {
295 return NGX_MAIL_PARSE_INVALID_COMMAND;
296 }
297
298 arg = s->args.elts;
299 s->login.len = arg[0].len;
300 s->login.data = ngx_palloc(c->pool, s->login.len);
301 if (s->login.data == NULL) {
302 return NGX_ERROR;
303 }
304
305 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
306
307 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
308 "pop3 login: \"%V\"", &s->login);
309
310 s->mail_state = ngx_pop3_user;
311
312 return NGX_OK;
313 }
314
315
316 static ngx_int_t
317 ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c)
318 {
319 ngx_str_t *arg;
320
321 if (s->args.nelts != 1) {
322 return NGX_MAIL_PARSE_INVALID_COMMAND;
323 }
324
325 arg = s->args.elts;
326 s->passwd.len = arg[0].len;
327 s->passwd.data = ngx_palloc(c->pool, s->passwd.len);
328 if (s->passwd.data == NULL) {
329 return NGX_ERROR;
330 }
331
332 ngx_memcpy(s->passwd.data, arg[0].data, s->passwd.len);
333
334 #if (NGX_DEBUG_MAIL_PASSWD)
335 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
336 "pop3 passwd: \"%V\"", &s->passwd);
337 #endif
338
339 return NGX_DONE;
340 }
341
342
343 static ngx_int_t
344 ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c, ngx_int_t stls)
345 {
346 ngx_mail_pop3_srv_conf_t *pscf;
347 #if (NGX_MAIL_SSL)
348 ngx_mail_ssl_conf_t *sslcf;
349 #endif
350
351 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
352
353 #if (NGX_MAIL_SSL)
354
355 if (stls && c->ssl == NULL) {
356 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
357
358 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
359 s->out = pscf->starttls_capability;
360 return NGX_OK;
361 }
362
363 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
364 s->out = pscf->starttls_only_capability;
365 return NGX_OK;
366 }
367 }
368
369 #endif
370
371 s->out = pscf->capability;
372 return NGX_OK;
373 }
374
375
376 static ngx_int_t
377 ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c)
378 {
379 #if (NGX_MAIL_SSL)
380 ngx_mail_ssl_conf_t *sslcf;
381
382 if (c->ssl == NULL) {
383 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
384 if (sslcf->starttls) {
385 c->read->handler = ngx_mail_starttls_handler;
386 return NGX_OK;
387 }
388 }
389
390 #endif
391
392 return NGX_MAIL_PARSE_INVALID_COMMAND;
393 }
394
395
396 static ngx_int_t
397 ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c)
398 {
399 ngx_str_t *arg;
400 ngx_mail_pop3_srv_conf_t *pscf;
401
402 #if (NGX_MAIL_SSL)
403 if (ngx_mail_starttls_only(s, c)) {
404 return NGX_MAIL_PARSE_INVALID_COMMAND;
405 }
406 #endif
407
408 if (s->args.nelts != 2) {
409 return NGX_MAIL_PARSE_INVALID_COMMAND;
410 }
411
412 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
413
414 if (!(pscf->auth_methods & NGX_MAIL_AUTH_APOP_ENABLED)) {
415 return NGX_MAIL_PARSE_INVALID_COMMAND;
416 }
417
418 arg = s->args.elts;
419
420 s->login.len = arg[0].len;
421 s->login.data = ngx_palloc(c->pool, s->login.len);
422 if (s->login.data == NULL) {
423 return NGX_ERROR;
424 }
425
426 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
427
428 s->passwd.len = arg[1].len;
429 s->passwd.data = ngx_palloc(c->pool, s->passwd.len);
430 if (s->passwd.data == NULL) {
431 return NGX_ERROR;
432 }
433
434 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len);
435
436 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
437 "pop3 apop: \"%V\" \"%V\"", &s->login, &s->passwd);
438
439 s->auth_method = NGX_MAIL_AUTH_APOP;
440
441 return NGX_DONE;
442 }
443
444
445 static ngx_int_t
446 ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c)
447 {
448 ngx_int_t rc;
449 ngx_mail_pop3_srv_conf_t *pscf;
450
451 #if (NGX_MAIL_SSL)
452 if (ngx_mail_starttls_only(s, c)) {
453 return NGX_MAIL_PARSE_INVALID_COMMAND;
454 }
455 #endif
456
457 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module);
458
459 if (s->args.nelts == 0) {
460 s->out = pscf->auth_capability;
461 s->state = 0;
462
463 return NGX_OK;
464 }
465
466 rc = ngx_mail_auth_parse(s, c);
467
468 switch (rc) {
469
470 case NGX_MAIL_AUTH_LOGIN:
471
472 s->out.len = sizeof(pop3_username) - 1;
473 s->out.data = pop3_username;
474 s->mail_state = ngx_pop3_auth_login_username;
475
476 return NGX_OK;
477
478 case NGX_MAIL_AUTH_PLAIN:
479
480 s->out.len = sizeof(pop3_next) - 1;
481 s->out.data = pop3_next;
482 s->mail_state = ngx_pop3_auth_plain;
483
484 return NGX_OK;
485
486 case NGX_MAIL_AUTH_CRAM_MD5:
487
488 if (!(pscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
489 return NGX_MAIL_PARSE_INVALID_COMMAND;
490 }
491
492 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) {
493 s->mail_state = ngx_pop3_auth_cram_md5;
494 return NGX_OK;
495 }
496
497 return NGX_ERROR;
498 }
499
500 return rc;
501 }