Mercurial > hg > nginx-quic
annotate src/mail/ngx_mail_imap_handler.c @ 6982:ac9b1df5b246
SSL: disabled renegotiation detection in client mode.
CVE-2009-3555 is no longer relevant and mitigated by the renegotiation
info extension (secure renegotiation). On the other hand, unexpected
renegotiation still introduces potential security risks, and hence we do
not allow renegotiation on the server side, as we never request renegotiation.
On the client side the situation is different though. There are backends
which explicitly request renegotiation, and disabled renegotiation
introduces interoperability problems. This change allows renegotiation
on the client side, and fixes interoperability problems as observed with
such backends (ticket #872).
Additionally, with TLSv1.3 the SSL_CB_HANDSHAKE_START flag is currently set
by OpenSSL when receiving a NewSessionTicket message, and was detected by
nginx as a renegotiation attempt. This looks like a bug in OpenSSL, though
this change also allows better interoperability till the problem is fixed.
author | Sergey Kandaurov <pluknet@nginx.com> |
---|---|
date | Tue, 18 Apr 2017 16:08:44 +0300 |
parents | b2915d99ee8d |
children | ab6257dac2a8 |
rev | line source |
---|---|
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_event.h> |
1136 | 11 #include <ngx_mail.h> |
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12 #include <ngx_mail_imap_module.h> |
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13 |
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14 |
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15 static ngx_int_t ngx_mail_imap_login(ngx_mail_session_t *s, |
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16 ngx_connection_t *c); |
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17 static ngx_int_t ngx_mail_imap_authenticate(ngx_mail_session_t *s, |
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18 ngx_connection_t *c); |
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19 static ngx_int_t ngx_mail_imap_capability(ngx_mail_session_t *s, |
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20 ngx_connection_t *c); |
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21 static ngx_int_t ngx_mail_imap_starttls(ngx_mail_session_t *s, |
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22 ngx_connection_t *c); |
539 | 23 |
413
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24 |
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25 static u_char imap_greeting[] = "* OK IMAP4 ready" CRLF; |
543 | 26 static u_char imap_star[] = "* "; |
529 | 27 static u_char imap_ok[] = "OK completed" CRLF; |
527 | 28 static u_char imap_next[] = "+ OK" CRLF; |
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29 static u_char imap_plain_next[] = "+ " CRLF; |
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30 static u_char imap_username[] = "+ VXNlcm5hbWU6" CRLF; |
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31 static u_char imap_password[] = "+ UGFzc3dvcmQ6" CRLF; |
527 | 32 static u_char imap_bye[] = "* BYE" CRLF; |
33 static u_char imap_invalid_command[] = "BAD invalid command" CRLF; | |
34 | |
521 | 35 |
36 void | |
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37 ngx_mail_imap_init_session(ngx_mail_session_t *s, ngx_connection_t *c) |
413
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38 { |
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39 ngx_mail_core_srv_conf_t *cscf; |
641 | 40 |
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41 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
541 | 42 |
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43 ngx_str_set(&s->out, imap_greeting); |
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44 |
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45 c->read->handler = ngx_mail_imap_init_protocol; |
583 | 46 |
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47 ngx_add_timer(c->read, cscf->timeout); |
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48 |
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49 if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
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50 ngx_mail_close_connection(c); |
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51 } |
539 | 52 |
1136 | 53 ngx_mail_send(c->write); |
539 | 54 } |
55 | |
56 | |
57 void | |
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58 ngx_mail_imap_init_protocol(ngx_event_t *rev) |
539 | 59 { |
521 | 60 ngx_connection_t *c; |
1136 | 61 ngx_mail_session_t *s; |
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62 ngx_mail_imap_srv_conf_t *iscf; |
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63 |
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64 c = rev->data; |
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65 |
541 | 66 c->log->action = "in auth state"; |
67 | |
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68 if (rev->timedout) { |
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69 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); |
577 | 70 c->timedout = 1; |
1136 | 71 ngx_mail_close_connection(c); |
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72 return; |
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73 } |
420
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74 |
539 | 75 s = c->data; |
521 | 76 |
419
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77 if (s->buffer == NULL) { |
583 | 78 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) |
79 == NGX_ERROR) | |
80 { | |
1136 | 81 ngx_mail_session_internal_server_error(s); |
583 | 82 return; |
83 } | |
84 | |
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85 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module); |
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86 |
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87 s->buffer = ngx_create_temp_buf(c->pool, iscf->client_buffer_size); |
583 | 88 if (s->buffer == NULL) { |
1136 | 89 ngx_mail_session_internal_server_error(s); |
583 | 90 return; |
91 } | |
419
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92 } |
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93 |
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94 s->mail_state = ngx_imap_start; |
1477 | 95 c->read->handler = ngx_mail_imap_auth_state; |
1136 | 96 |
1477 | 97 ngx_mail_imap_auth_state(rev); |
1136 | 98 } |
99 | |
100 | |
101 void | |
1477 | 102 ngx_mail_imap_auth_state(ngx_event_t *rev) |
1136 | 103 { |
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104 u_char *p, *dst, *src, *end; |
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105 ngx_str_t *arg; |
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106 ngx_int_t rc; |
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107 ngx_uint_t tag, i; |
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108 ngx_connection_t *c; |
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109 ngx_mail_session_t *s; |
1136 | 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 | |
1482 | 131 rc = ngx_mail_read_command(s, c); |
527 | 132 |
133 if (rc == NGX_AGAIN || rc == NGX_ERROR) { | |
134 return; | |
135 } | |
136 | |
137 tag = 1; | |
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138 s->text.len = 0; |
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139 ngx_str_set(&s->out, imap_ok); |
527 | 140 |
141 if (rc == NGX_OK) { | |
142 | |
1136 | 143 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap auth command: %i", |
527 | 144 s->command); |
145 | |
543 | 146 if (s->backslash) { |
147 | |
148 arg = s->args.elts; | |
149 | |
150 for (i = 0; i < s->args.nelts; i++) { | |
151 dst = arg[i].data; | |
152 end = dst + arg[i].len; | |
153 | |
154 for (src = dst; src < end; dst++) { | |
155 *dst = *src; | |
156 if (*src++ == '\\') { | |
157 *dst = *src++; | |
158 } | |
159 } | |
160 | |
161 arg[i].len = dst - arg[i].data; | |
162 } | |
163 | |
164 s->backslash = 0; | |
165 } | |
166 | |
1323 | 167 switch (s->mail_state) { |
168 | |
169 case ngx_imap_start: | |
170 | |
171 switch (s->command) { | |
172 | |
173 case NGX_IMAP_LOGIN: | |
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174 rc = ngx_mail_imap_login(s, c); |
1323 | 175 break; |
176 | |
177 case NGX_IMAP_AUTHENTICATE: | |
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178 rc = ngx_mail_imap_authenticate(s, c); |
1479 | 179 tag = (rc != NGX_OK); |
1323 | 180 break; |
181 | |
182 case NGX_IMAP_CAPABILITY: | |
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183 rc = ngx_mail_imap_capability(s, c); |
1323 | 184 break; |
185 | |
186 case NGX_IMAP_LOGOUT: | |
187 s->quit = 1; | |
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188 ngx_str_set(&s->text, imap_bye); |
1323 | 189 break; |
190 | |
191 case NGX_IMAP_NOOP: | |
192 break; | |
193 | |
194 case NGX_IMAP_STARTTLS: | |
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195 rc = ngx_mail_imap_starttls(s, c); |
1323 | 196 break; |
197 | |
198 default: | |
199 rc = NGX_MAIL_PARSE_INVALID_COMMAND; | |
200 break; | |
201 } | |
202 | |
203 break; | |
204 | |
205 case ngx_imap_auth_login_username: | |
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206 rc = ngx_mail_auth_login_username(s, c, 0); |
1323 | 207 |
208 tag = 0; | |
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209 ngx_str_set(&s->out, imap_password); |
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210 s->mail_state = ngx_imap_auth_login_password; |
1323 | 211 |
212 break; | |
213 | |
214 case ngx_imap_auth_login_password: | |
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215 rc = ngx_mail_auth_login_password(s, c); |
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216 break; |
1323 | 217 |
218 case ngx_imap_auth_plain: | |
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219 rc = ngx_mail_auth_plain(s, c, 0); |
527 | 220 break; |
221 | |
1323 | 222 case ngx_imap_auth_cram_md5: |
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223 rc = ngx_mail_auth_cram_md5(s, c); |
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224 break; |
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225 |
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226 case ngx_imap_auth_external: |
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227 rc = ngx_mail_auth_external(s, c, 0); |
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228 break; |
527 | 229 } |
230 | |
231 } else if (rc == NGX_IMAP_NEXT) { | |
232 tag = 0; | |
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233 ngx_str_set(&s->out, imap_next); |
527 | 234 } |
235 | |
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236 switch (rc) { |
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237 |
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238 case NGX_DONE: |
1482 | 239 ngx_mail_auth(s, c); |
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240 return; |
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241 |
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242 case NGX_ERROR: |
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243 ngx_mail_session_internal_server_error(s); |
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244 return; |
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245 |
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246 case NGX_MAIL_PARSE_INVALID_COMMAND: |
1323 | 247 s->state = 0; |
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248 ngx_str_set(&s->out, imap_invalid_command); |
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249 s->mail_state = ngx_imap_start; |
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250 break; |
527 | 251 } |
252 | |
253 if (tag) { | |
543 | 254 if (s->tag.len == 0) { |
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255 ngx_str_set(&s->tag, imap_star); |
543 | 256 } |
257 | |
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258 if (s->tagged_line.len < s->tag.len + s->text.len + s->out.len) { |
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259 s->tagged_line.len = s->tag.len + s->text.len + s->out.len; |
2049 | 260 s->tagged_line.data = ngx_pnalloc(c->pool, s->tagged_line.len); |
539 | 261 if (s->tagged_line.data == NULL) { |
1136 | 262 ngx_mail_close_connection(c); |
527 | 263 return; |
264 } | |
265 } | |
266 | |
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267 p = s->tagged_line.data; |
539 | 268 |
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269 if (s->text.len) { |
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270 p = ngx_cpymem(p, s->text.data, s->text.len); |
527 | 271 } |
272 | |
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273 p = ngx_cpymem(p, s->tag.data, s->tag.len); |
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274 ngx_memcpy(p, s->out.data, s->out.len); |
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275 |
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276 s->out.len = s->text.len + s->tag.len + s->out.len; |
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277 s->out.data = s->tagged_line.data; |
527 | 278 } |
279 | |
539 | 280 if (rc != NGX_IMAP_NEXT) { |
281 s->args.nelts = 0; | |
1323 | 282 |
283 if (s->state) { | |
284 /* preserve tag */ | |
285 s->arg_start = s->buffer->start + s->tag.len; | |
286 s->buffer->pos = s->arg_start; | |
287 s->buffer->last = s->arg_start; | |
288 | |
289 } else { | |
290 s->buffer->pos = s->buffer->start; | |
291 s->buffer->last = s->buffer->start; | |
292 s->tag.len = 0; | |
293 } | |
527 | 294 } |
295 | |
1136 | 296 ngx_mail_send(c->write); |
521 | 297 } |
298 | |
299 | |
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300 static ngx_int_t |
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301 ngx_mail_imap_login(ngx_mail_session_t *s, ngx_connection_t *c) |
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302 { |
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303 ngx_str_t *arg; |
1479 | 304 |
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305 #if (NGX_MAIL_SSL) |
1479 | 306 if (ngx_mail_starttls_only(s, c)) { |
307 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
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308 } |
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309 #endif |
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310 |
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311 arg = s->args.elts; |
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312 |
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313 if (s->args.nelts != 2 || arg[0].len == 0) { |
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314 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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315 } |
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316 |
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317 s->login.len = arg[0].len; |
2049 | 318 s->login.data = ngx_pnalloc(c->pool, s->login.len); |
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319 if (s->login.data == NULL) { |
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320 return NGX_ERROR; |
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321 } |
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322 |
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323 ngx_memcpy(s->login.data, arg[0].data, s->login.len); |
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324 |
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325 s->passwd.len = arg[1].len; |
2049 | 326 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len); |
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327 if (s->passwd.data == NULL) { |
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328 return NGX_ERROR; |
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329 } |
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330 |
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331 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len); |
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332 |
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333 #if (NGX_DEBUG_MAIL_PASSWD) |
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334 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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335 "imap login:\"%V\" passwd:\"%V\"", |
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336 &s->login, &s->passwd); |
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337 #else |
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338 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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339 "imap login:\"%V\"", &s->login); |
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340 #endif |
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341 |
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342 return NGX_DONE; |
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343 } |
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344 |
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345 |
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346 static ngx_int_t |
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347 ngx_mail_imap_authenticate(ngx_mail_session_t *s, ngx_connection_t *c) |
420
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348 { |
1479 | 349 ngx_int_t rc; |
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350 ngx_mail_core_srv_conf_t *cscf; |
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351 ngx_mail_imap_srv_conf_t *iscf; |
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352 |
1479 | 353 #if (NGX_MAIL_SSL) |
354 if (ngx_mail_starttls_only(s, c)) { | |
355 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
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356 } |
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357 #endif |
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358 |
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359 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module); |
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360 |
1479 | 361 rc = ngx_mail_auth_parse(s, c); |
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362 |
1479 | 363 switch (rc) { |
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364 |
1479 | 365 case NGX_MAIL_AUTH_LOGIN: |
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366 |
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367 ngx_str_set(&s->out, imap_username); |
1479 | 368 s->mail_state = ngx_imap_auth_login_username; |
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369 |
1479 | 370 return NGX_OK; |
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371 |
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372 case NGX_MAIL_AUTH_LOGIN_USERNAME: |
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373 |
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374 ngx_str_set(&s->out, imap_password); |
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375 s->mail_state = ngx_imap_auth_login_password; |
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376 |
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377 return ngx_mail_auth_login_username(s, c, 1); |
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378 |
1479 | 379 case NGX_MAIL_AUTH_PLAIN: |
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380 |
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381 ngx_str_set(&s->out, imap_plain_next); |
1479 | 382 s->mail_state = ngx_imap_auth_plain; |
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383 |
1479 | 384 return NGX_OK; |
385 | |
386 case NGX_MAIL_AUTH_CRAM_MD5: | |
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387 |
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388 if (!(iscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) { |
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389 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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390 } |
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391 |
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392 if (s->salt.data == NULL) { |
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393 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
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394 |
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395 if (ngx_mail_salt(s, c, cscf) != NGX_OK) { |
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396 return NGX_ERROR; |
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397 } |
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398 } |
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399 |
1479 | 400 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) { |
401 s->mail_state = ngx_imap_auth_cram_md5; | |
402 return NGX_OK; | |
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403 } |
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404 |
1479 | 405 return NGX_ERROR; |
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406 |
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407 case NGX_MAIL_AUTH_EXTERNAL: |
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408 |
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409 if (!(iscf->auth_methods & NGX_MAIL_AUTH_EXTERNAL_ENABLED)) { |
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410 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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411 } |
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412 |
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413 ngx_str_set(&s->out, imap_username); |
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414 s->mail_state = ngx_imap_auth_external; |
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415 |
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416 return NGX_OK; |
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417 } |
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418 |
1479 | 419 return rc; |
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420 } |
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421 |
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422 |
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423 static ngx_int_t |
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424 ngx_mail_imap_capability(ngx_mail_session_t *s, ngx_connection_t *c) |
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425 { |
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426 ngx_mail_imap_srv_conf_t *iscf; |
420
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427 |
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428 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module); |
809 | 429 |
1322 | 430 #if (NGX_MAIL_SSL) |
431 | |
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432 if (c->ssl == NULL) { |
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433 ngx_mail_ssl_conf_t *sslcf; |
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434 |
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435 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
809 | 436 |
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437 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) { |
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438 s->text = iscf->starttls_capability; |
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439 return NGX_OK; |
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440 } |
1136 | 441 |
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442 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) { |
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443 s->text = iscf->starttls_only_capability; |
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444 return NGX_OK; |
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445 } |
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446 } |
1322 | 447 #endif |
448 | |
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449 s->text = iscf->capability; |
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450 |
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451 return NGX_OK; |
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452 } |
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453 |
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454 |
521 | 455 static ngx_int_t |
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456 ngx_mail_imap_starttls(ngx_mail_session_t *s, ngx_connection_t *c) |
420
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457 { |
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458 #if (NGX_MAIL_SSL) |
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459 ngx_mail_ssl_conf_t *sslcf; |
1136 | 460 |
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461 if (c->ssl == NULL) { |
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462 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
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463 if (sslcf->starttls) { |
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464 c->read->handler = ngx_mail_starttls_handler; |
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465 return NGX_OK; |
539 | 466 } |
467 } | |
468 | |
469 #endif | |
470 | |
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471 return NGX_MAIL_PARSE_INVALID_COMMAND; |
417
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472 } |