|
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_imap_module.h>
|
|
|
12
|
|
|
13
|
|
|
14 static ngx_int_t ngx_mail_imap_login(ngx_mail_session_t *s,
|
|
|
15 ngx_connection_t *c);
|
|
|
16 static ngx_int_t ngx_mail_imap_authenticate(ngx_mail_session_t *s,
|
|
|
17 ngx_connection_t *c);
|
|
|
18 static ngx_int_t ngx_mail_imap_capability(ngx_mail_session_t *s,
|
|
|
19 ngx_connection_t *c);
|
|
|
20 static ngx_int_t ngx_mail_imap_starttls(ngx_mail_session_t *s,
|
|
|
21 ngx_connection_t *c);
|
|
|
22
|
|
|
23
|
|
|
24 static u_char imap_greeting[] = "* OK IMAP4 ready" CRLF;
|
|
|
25 static u_char imap_star[] = "* ";
|
|
|
26 static u_char imap_ok[] = "OK completed" CRLF;
|
|
|
27 static u_char imap_next[] = "+ OK" CRLF;
|
|
|
28 static u_char imap_plain_next[] = "+ " CRLF;
|
|
|
29 static u_char imap_username[] = "+ VXNlcm5hbWU6" CRLF;
|
|
|
30 static u_char imap_password[] = "+ UGFzc3dvcmQ6" CRLF;
|
|
|
31 static u_char imap_bye[] = "* BYE" CRLF;
|
|
|
32 static u_char imap_invalid_command[] = "BAD invalid command" CRLF;
|
|
|
33
|
|
|
34
|
|
|
35 void
|
|
|
36 ngx_mail_imap_init_session(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
37 {
|
|
|
38 ngx_mail_core_srv_conf_t *cscf;
|
|
|
39
|
|
|
40 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
|
41
|
|
|
42 s->out.len = sizeof(imap_greeting) - 1;
|
|
|
43 s->out.data = imap_greeting;
|
|
|
44
|
|
|
45 c->read->handler = ngx_mail_imap_init_protocol;
|
|
|
46
|
|
|
47 ngx_add_timer(c->read, cscf->timeout);
|
|
|
48
|
|
430
|
49 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
|
|
336
|
50 ngx_mail_close_connection(c);
|
|
|
51 }
|
|
|
52
|
|
|
53 ngx_mail_send(c->write);
|
|
|
54 }
|
|
|
55
|
|
|
56
|
|
|
57 void
|
|
|
58 ngx_mail_imap_init_protocol(ngx_event_t *rev)
|
|
|
59 {
|
|
|
60 ngx_connection_t *c;
|
|
|
61 ngx_mail_session_t *s;
|
|
|
62 ngx_mail_imap_srv_conf_t *iscf;
|
|
|
63
|
|
|
64 c = rev->data;
|
|
|
65
|
|
|
66 c->log->action = "in auth state";
|
|
|
67
|
|
|
68 if (rev->timedout) {
|
|
|
69 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
|
|
|
70 c->timedout = 1;
|
|
|
71 ngx_mail_close_connection(c);
|
|
|
72 return;
|
|
|
73 }
|
|
|
74
|
|
|
75 s = c->data;
|
|
|
76
|
|
|
77 if (s->buffer == NULL) {
|
|
|
78 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t))
|
|
|
79 == NGX_ERROR)
|
|
|
80 {
|
|
|
81 ngx_mail_session_internal_server_error(s);
|
|
|
82 return;
|
|
|
83 }
|
|
|
84
|
|
|
85 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
|
|
|
86
|
|
|
87 s->buffer = ngx_create_temp_buf(c->pool, iscf->client_buffer_size);
|
|
|
88 if (s->buffer == NULL) {
|
|
|
89 ngx_mail_session_internal_server_error(s);
|
|
|
90 return;
|
|
|
91 }
|
|
|
92 }
|
|
|
93
|
|
|
94 s->mail_state = ngx_imap_start;
|
|
|
95 c->read->handler = ngx_mail_imap_auth_state;
|
|
|
96
|
|
|
97 ngx_mail_imap_auth_state(rev);
|
|
|
98 }
|
|
|
99
|
|
|
100
|
|
|
101 void
|
|
|
102 ngx_mail_imap_auth_state(ngx_event_t *rev)
|
|
|
103 {
|
|
|
104 u_char *p, *dst, *src, *end;
|
|
|
105 ngx_str_t *arg;
|
|
|
106 ngx_int_t rc;
|
|
|
107 ngx_uint_t tag, i;
|
|
|
108 ngx_connection_t *c;
|
|
|
109 ngx_mail_session_t *s;
|
|
|
110
|
|
|
111 c = rev->data;
|
|
|
112 s = c->data;
|
|
|
113
|
|
|
114 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap auth state");
|
|
|
115
|
|
|
116 if (rev->timedout) {
|
|
|
117 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
|
|
|
118 c->timedout = 1;
|
|
|
119 ngx_mail_close_connection(c);
|
|
|
120 return;
|
|
|
121 }
|
|
|
122
|
|
|
123 if (s->out.len) {
|
|
|
124 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap send handler busy");
|
|
|
125 s->blocked = 1;
|
|
|
126 return;
|
|
|
127 }
|
|
|
128
|
|
|
129 s->blocked = 0;
|
|
|
130
|
|
|
131 rc = ngx_mail_read_command(s, c);
|
|
|
132
|
|
|
133 if (rc == NGX_AGAIN || rc == NGX_ERROR) {
|
|
|
134 return;
|
|
|
135 }
|
|
|
136
|
|
|
137 tag = 1;
|
|
|
138 s->text.len = 0;
|
|
|
139 s->out.len = sizeof(imap_ok) - 1;
|
|
|
140 s->out.data = imap_ok;
|
|
|
141
|
|
|
142 if (rc == NGX_OK) {
|
|
|
143
|
|
|
144 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap auth command: %i",
|
|
|
145 s->command);
|
|
|
146
|
|
|
147 if (s->backslash) {
|
|
|
148
|
|
|
149 arg = s->args.elts;
|
|
|
150
|
|
|
151 for (i = 0; i < s->args.nelts; i++) {
|
|
|
152 dst = arg[i].data;
|
|
|
153 end = dst + arg[i].len;
|
|
|
154
|
|
|
155 for (src = dst; src < end; dst++) {
|
|
|
156 *dst = *src;
|
|
|
157 if (*src++ == '\\') {
|
|
|
158 *dst = *src++;
|
|
|
159 }
|
|
|
160 }
|
|
|
161
|
|
|
162 arg[i].len = dst - arg[i].data;
|
|
|
163 }
|
|
|
164
|
|
|
165 s->backslash = 0;
|
|
|
166 }
|
|
|
167
|
|
|
168 switch (s->mail_state) {
|
|
|
169
|
|
|
170 case ngx_imap_start:
|
|
|
171
|
|
|
172 switch (s->command) {
|
|
|
173
|
|
|
174 case NGX_IMAP_LOGIN:
|
|
|
175 rc = ngx_mail_imap_login(s, c);
|
|
|
176 break;
|
|
|
177
|
|
|
178 case NGX_IMAP_AUTHENTICATE:
|
|
|
179 rc = ngx_mail_imap_authenticate(s, c);
|
|
|
180 tag = (rc != NGX_OK);
|
|
|
181 break;
|
|
|
182
|
|
|
183 case NGX_IMAP_CAPABILITY:
|
|
|
184 rc = ngx_mail_imap_capability(s, c);
|
|
|
185 break;
|
|
|
186
|
|
|
187 case NGX_IMAP_LOGOUT:
|
|
|
188 s->quit = 1;
|
|
|
189 s->text.len = sizeof(imap_bye) - 1;
|
|
|
190 s->text.data = imap_bye;
|
|
|
191 break;
|
|
|
192
|
|
|
193 case NGX_IMAP_NOOP:
|
|
|
194 break;
|
|
|
195
|
|
|
196 case NGX_IMAP_STARTTLS:
|
|
|
197 rc = ngx_mail_imap_starttls(s, c);
|
|
|
198 break;
|
|
|
199
|
|
|
200 default:
|
|
|
201 rc = NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
202 break;
|
|
|
203 }
|
|
|
204
|
|
|
205 break;
|
|
|
206
|
|
|
207 case ngx_imap_auth_login_username:
|
|
444
|
208 rc = ngx_mail_auth_login_username(s, c, 0);
|
|
336
|
209
|
|
|
210 tag = 0;
|
|
|
211 s->out.len = sizeof(imap_password) - 1;
|
|
|
212 s->out.data = imap_password;
|
|
|
213 s->mail_state = ngx_imap_auth_login_password;
|
|
|
214
|
|
|
215 break;
|
|
|
216
|
|
|
217 case ngx_imap_auth_login_password:
|
|
|
218 rc = ngx_mail_auth_login_password(s, c);
|
|
|
219 break;
|
|
|
220
|
|
|
221 case ngx_imap_auth_plain:
|
|
|
222 rc = ngx_mail_auth_plain(s, c, 0);
|
|
|
223 break;
|
|
|
224
|
|
|
225 case ngx_imap_auth_cram_md5:
|
|
|
226 rc = ngx_mail_auth_cram_md5(s, c);
|
|
|
227 break;
|
|
|
228 }
|
|
|
229
|
|
|
230 } else if (rc == NGX_IMAP_NEXT) {
|
|
|
231 tag = 0;
|
|
|
232 s->out.len = sizeof(imap_next) - 1;
|
|
|
233 s->out.data = imap_next;
|
|
|
234 }
|
|
|
235
|
|
|
236 switch (rc) {
|
|
|
237
|
|
|
238 case NGX_DONE:
|
|
|
239 ngx_mail_auth(s, c);
|
|
|
240 return;
|
|
|
241
|
|
|
242 case NGX_ERROR:
|
|
|
243 ngx_mail_session_internal_server_error(s);
|
|
|
244 return;
|
|
|
245
|
|
|
246 case NGX_MAIL_PARSE_INVALID_COMMAND:
|
|
|
247 s->state = 0;
|
|
|
248 s->out.len = sizeof(imap_invalid_command) - 1;
|
|
|
249 s->out.data = imap_invalid_command;
|
|
|
250 s->mail_state = ngx_imap_start;
|
|
|
251 break;
|
|
|
252 }
|
|
|
253
|
|
|
254 if (tag) {
|
|
|
255 if (s->tag.len == 0) {
|
|
|
256 s->tag.len = sizeof(imap_star) - 1;
|
|
|
257 s->tag.data = (u_char *) imap_star;
|
|
|
258 }
|
|
|
259
|
|
|
260 if (s->tagged_line.len < s->tag.len + s->text.len + s->out.len) {
|
|
|
261 s->tagged_line.len = s->tag.len + s->text.len + s->out.len;
|
|
382
|
262 s->tagged_line.data = ngx_pnalloc(c->pool, s->tagged_line.len);
|
|
336
|
263 if (s->tagged_line.data == NULL) {
|
|
|
264 ngx_mail_close_connection(c);
|
|
|
265 return;
|
|
|
266 }
|
|
|
267 }
|
|
|
268
|
|
|
269 p = s->tagged_line.data;
|
|
|
270
|
|
|
271 if (s->text.len) {
|
|
|
272 p = ngx_cpymem(p, s->text.data, s->text.len);
|
|
|
273 }
|
|
|
274
|
|
|
275 p = ngx_cpymem(p, s->tag.data, s->tag.len);
|
|
|
276 ngx_memcpy(p, s->out.data, s->out.len);
|
|
|
277
|
|
|
278 s->out.len = s->text.len + s->tag.len + s->out.len;
|
|
|
279 s->out.data = s->tagged_line.data;
|
|
|
280 }
|
|
|
281
|
|
|
282 if (rc != NGX_IMAP_NEXT) {
|
|
|
283 s->args.nelts = 0;
|
|
|
284
|
|
|
285 if (s->state) {
|
|
|
286 /* preserve tag */
|
|
|
287 s->arg_start = s->buffer->start + s->tag.len;
|
|
|
288 s->buffer->pos = s->arg_start;
|
|
|
289 s->buffer->last = s->arg_start;
|
|
|
290
|
|
|
291 } else {
|
|
|
292 s->buffer->pos = s->buffer->start;
|
|
|
293 s->buffer->last = s->buffer->start;
|
|
|
294 s->tag.len = 0;
|
|
|
295 }
|
|
|
296 }
|
|
|
297
|
|
|
298 ngx_mail_send(c->write);
|
|
|
299 }
|
|
|
300
|
|
|
301
|
|
|
302 static ngx_int_t
|
|
|
303 ngx_mail_imap_login(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
304 {
|
|
356
|
305 ngx_str_t *arg;
|
|
336
|
306
|
|
|
307 #if (NGX_MAIL_SSL)
|
|
|
308 if (ngx_mail_starttls_only(s, c)) {
|
|
|
309 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
310 }
|
|
|
311 #endif
|
|
|
312
|
|
|
313 arg = s->args.elts;
|
|
|
314
|
|
|
315 if (s->args.nelts != 2 || arg[0].len == 0) {
|
|
|
316 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
317 }
|
|
|
318
|
|
|
319 s->login.len = arg[0].len;
|
|
382
|
320 s->login.data = ngx_pnalloc(c->pool, s->login.len);
|
|
336
|
321 if (s->login.data == NULL) {
|
|
|
322 return NGX_ERROR;
|
|
|
323 }
|
|
|
324
|
|
|
325 ngx_memcpy(s->login.data, arg[0].data, s->login.len);
|
|
|
326
|
|
|
327 s->passwd.len = arg[1].len;
|
|
382
|
328 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len);
|
|
336
|
329 if (s->passwd.data == NULL) {
|
|
|
330 return NGX_ERROR;
|
|
|
331 }
|
|
|
332
|
|
|
333 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len);
|
|
|
334
|
|
|
335 #if (NGX_DEBUG_MAIL_PASSWD)
|
|
|
336 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
|
|
|
337 "imap login:\"%V\" passwd:\"%V\"",
|
|
|
338 &s->login, &s->passwd);
|
|
|
339 #else
|
|
|
340 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
|
|
|
341 "imap login:\"%V\"", &s->login);
|
|
|
342 #endif
|
|
|
343
|
|
|
344 return NGX_DONE;
|
|
|
345 }
|
|
|
346
|
|
|
347
|
|
|
348 static ngx_int_t
|
|
|
349 ngx_mail_imap_authenticate(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
350 {
|
|
|
351 ngx_int_t rc;
|
|
|
352 ngx_mail_core_srv_conf_t *cscf;
|
|
|
353 ngx_mail_imap_srv_conf_t *iscf;
|
|
|
354
|
|
|
355 #if (NGX_MAIL_SSL)
|
|
|
356 if (ngx_mail_starttls_only(s, c)) {
|
|
|
357 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
358 }
|
|
|
359 #endif
|
|
|
360
|
|
|
361 rc = ngx_mail_auth_parse(s, c);
|
|
|
362
|
|
|
363 switch (rc) {
|
|
|
364
|
|
|
365 case NGX_MAIL_AUTH_LOGIN:
|
|
|
366
|
|
|
367 s->out.len = sizeof(imap_username) - 1;
|
|
|
368 s->out.data = imap_username;
|
|
|
369 s->mail_state = ngx_imap_auth_login_username;
|
|
|
370
|
|
|
371 return NGX_OK;
|
|
|
372
|
|
444
|
373 case NGX_MAIL_AUTH_LOGIN_USERNAME:
|
|
|
374
|
|
|
375 s->out.len = sizeof(imap_password) - 1;
|
|
|
376 s->out.data = imap_password;
|
|
|
377 s->mail_state = ngx_imap_auth_login_password;
|
|
|
378
|
|
|
379 return ngx_mail_auth_login_username(s, c, 1);
|
|
|
380
|
|
336
|
381 case NGX_MAIL_AUTH_PLAIN:
|
|
|
382
|
|
|
383 s->out.len = sizeof(imap_plain_next) - 1;
|
|
|
384 s->out.data = imap_plain_next;
|
|
|
385 s->mail_state = ngx_imap_auth_plain;
|
|
|
386
|
|
|
387 return NGX_OK;
|
|
|
388
|
|
|
389 case NGX_MAIL_AUTH_CRAM_MD5:
|
|
|
390
|
|
|
391 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
|
|
|
392
|
|
|
393 if (!(iscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) {
|
|
|
394 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
395 }
|
|
|
396
|
|
|
397 if (s->salt.data == NULL) {
|
|
|
398 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
|
399
|
|
|
400 if (ngx_mail_salt(s, c, cscf) != NGX_OK) {
|
|
|
401 return NGX_ERROR;
|
|
|
402 }
|
|
|
403 }
|
|
|
404
|
|
|
405 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) {
|
|
|
406 s->mail_state = ngx_imap_auth_cram_md5;
|
|
|
407 return NGX_OK;
|
|
|
408 }
|
|
|
409
|
|
|
410 return NGX_ERROR;
|
|
|
411 }
|
|
|
412
|
|
|
413 return rc;
|
|
|
414 }
|
|
|
415
|
|
|
416
|
|
|
417 static ngx_int_t
|
|
|
418 ngx_mail_imap_capability(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
419 {
|
|
|
420 ngx_mail_imap_srv_conf_t *iscf;
|
|
|
421
|
|
|
422 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module);
|
|
|
423
|
|
|
424 #if (NGX_MAIL_SSL)
|
|
|
425
|
|
|
426 if (c->ssl == NULL) {
|
|
356
|
427 ngx_mail_ssl_conf_t *sslcf;
|
|
|
428
|
|
336
|
429 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
|
|
|
430
|
|
|
431 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) {
|
|
|
432 s->text = iscf->starttls_capability;
|
|
|
433 return NGX_OK;
|
|
|
434 }
|
|
|
435
|
|
|
436 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
|
|
|
437 s->text = iscf->starttls_only_capability;
|
|
|
438 return NGX_OK;
|
|
|
439 }
|
|
|
440 }
|
|
|
441 #endif
|
|
|
442
|
|
|
443 s->text = iscf->capability;
|
|
|
444
|
|
|
445 return NGX_OK;
|
|
|
446 }
|
|
|
447
|
|
|
448
|
|
|
449 static ngx_int_t
|
|
|
450 ngx_mail_imap_starttls(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
|
451 {
|
|
|
452 #if (NGX_MAIL_SSL)
|
|
|
453 ngx_mail_ssl_conf_t *sslcf;
|
|
|
454
|
|
|
455 if (c->ssl == NULL) {
|
|
|
456 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
|
|
|
457 if (sslcf->starttls) {
|
|
|
458 c->read->handler = ngx_mail_starttls_handler;
|
|
|
459 return NGX_OK;
|
|
|
460 }
|
|
|
461 }
|
|
|
462
|
|
|
463 #endif
|
|
|
464
|
|
|
465 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
|
466 }
|
