Mercurial > hg > nginx
annotate src/mail/ngx_mail_imap_handler.c @ 7851:aa5f8825f24d
Resolver: fixed label types handling in ngx_resolver_copy().
Previously, anything with any of the two high bits set were interpreted
as compression pointers. This is incorrect, as RFC 1035 clearly states
that "The 10 and 01 combinations are reserved for future use". Further,
the 01 combination is actually allocated for EDNS extended label type
(see RFC 2671 and RFC 6891), not really used though.
Fix is to reject unrecognized label types rather than misinterpreting
them as compression pointers.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Tue, 25 May 2021 15:17:41 +0300 |
parents | b38728495e1a |
children | c690a902bfec |
rev | line source |
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441
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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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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); |
423
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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; |
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105 ngx_int_t rc; |
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106 ngx_uint_t tag; |
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107 ngx_connection_t *c; |
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108 ngx_mail_session_t *s; |
1136 | 109 |
110 c = rev->data; | |
111 s = c->data; | |
112 | |
113 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap auth state"); | |
114 | |
115 if (rev->timedout) { | |
116 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); | |
117 c->timedout = 1; | |
118 ngx_mail_close_connection(c); | |
119 return; | |
120 } | |
121 | |
122 if (s->out.len) { | |
123 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap send handler busy"); | |
124 s->blocked = 1; | |
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125 |
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126 if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
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127 ngx_mail_close_connection(c); |
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128 return; |
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129 } |
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130 |
1136 | 131 return; |
132 } | |
133 | |
134 s->blocked = 0; | |
135 | |
1482 | 136 rc = ngx_mail_read_command(s, c); |
527 | 137 |
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138 if (rc == NGX_AGAIN) { |
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139 if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
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140 ngx_mail_session_internal_server_error(s); |
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141 return; |
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142 } |
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143 |
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144 return; |
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145 } |
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146 |
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147 if (rc == NGX_ERROR) { |
527 | 148 return; |
149 } | |
150 | |
151 tag = 1; | |
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152 s->text.len = 0; |
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153 ngx_str_set(&s->out, imap_ok); |
527 | 154 |
155 if (rc == NGX_OK) { | |
156 | |
1136 | 157 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap auth command: %i", |
527 | 158 s->command); |
159 | |
1323 | 160 switch (s->mail_state) { |
161 | |
162 case ngx_imap_start: | |
163 | |
164 switch (s->command) { | |
165 | |
166 case NGX_IMAP_LOGIN: | |
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167 rc = ngx_mail_imap_login(s, c); |
1323 | 168 break; |
169 | |
170 case NGX_IMAP_AUTHENTICATE: | |
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171 rc = ngx_mail_imap_authenticate(s, c); |
1479 | 172 tag = (rc != NGX_OK); |
1323 | 173 break; |
174 | |
175 case NGX_IMAP_CAPABILITY: | |
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176 rc = ngx_mail_imap_capability(s, c); |
1323 | 177 break; |
178 | |
179 case NGX_IMAP_LOGOUT: | |
180 s->quit = 1; | |
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181 ngx_str_set(&s->text, imap_bye); |
1323 | 182 break; |
183 | |
184 case NGX_IMAP_NOOP: | |
185 break; | |
186 | |
187 case NGX_IMAP_STARTTLS: | |
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188 rc = ngx_mail_imap_starttls(s, c); |
1323 | 189 break; |
190 | |
191 default: | |
192 rc = NGX_MAIL_PARSE_INVALID_COMMAND; | |
193 break; | |
194 } | |
195 | |
196 break; | |
197 | |
198 case ngx_imap_auth_login_username: | |
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199 rc = ngx_mail_auth_login_username(s, c, 0); |
1323 | 200 |
201 tag = 0; | |
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202 ngx_str_set(&s->out, imap_password); |
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203 s->mail_state = ngx_imap_auth_login_password; |
1323 | 204 |
205 break; | |
206 | |
207 case ngx_imap_auth_login_password: | |
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208 rc = ngx_mail_auth_login_password(s, c); |
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209 break; |
1323 | 210 |
211 case ngx_imap_auth_plain: | |
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212 rc = ngx_mail_auth_plain(s, c, 0); |
527 | 213 break; |
214 | |
1323 | 215 case ngx_imap_auth_cram_md5: |
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216 rc = ngx_mail_auth_cram_md5(s, c); |
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217 break; |
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218 |
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219 case ngx_imap_auth_external: |
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220 rc = ngx_mail_auth_external(s, c, 0); |
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221 break; |
527 | 222 } |
223 | |
224 } else if (rc == NGX_IMAP_NEXT) { | |
225 tag = 0; | |
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226 ngx_str_set(&s->out, imap_next); |
527 | 227 } |
228 | |
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229 if (s->buffer->pos < s->buffer->last) { |
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230 s->blocked = 1; |
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231 } |
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232 |
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233 switch (rc) { |
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234 |
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235 case NGX_DONE: |
1482 | 236 ngx_mail_auth(s, c); |
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237 return; |
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238 |
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239 case NGX_ERROR: |
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240 ngx_mail_session_internal_server_error(s); |
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241 return; |
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242 |
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243 case NGX_MAIL_PARSE_INVALID_COMMAND: |
1323 | 244 s->state = 0; |
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245 ngx_str_set(&s->out, imap_invalid_command); |
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246 s->mail_state = ngx_imap_start; |
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247 break; |
527 | 248 } |
249 | |
250 if (tag) { | |
543 | 251 if (s->tag.len == 0) { |
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252 ngx_str_set(&s->tag, imap_star); |
543 | 253 } |
254 | |
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255 if (s->tagged_line.len < s->tag.len + s->text.len + s->out.len) { |
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256 s->tagged_line.len = s->tag.len + s->text.len + s->out.len; |
2049 | 257 s->tagged_line.data = ngx_pnalloc(c->pool, s->tagged_line.len); |
539 | 258 if (s->tagged_line.data == NULL) { |
1136 | 259 ngx_mail_close_connection(c); |
527 | 260 return; |
261 } | |
262 } | |
263 | |
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264 p = s->tagged_line.data; |
539 | 265 |
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266 if (s->text.len) { |
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267 p = ngx_cpymem(p, s->text.data, s->text.len); |
527 | 268 } |
269 | |
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270 p = ngx_cpymem(p, s->tag.data, s->tag.len); |
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271 ngx_memcpy(p, s->out.data, s->out.len); |
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272 |
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273 s->out.len = s->text.len + s->tag.len + s->out.len; |
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274 s->out.data = s->tagged_line.data; |
527 | 275 } |
276 | |
539 | 277 if (rc != NGX_IMAP_NEXT) { |
278 s->args.nelts = 0; | |
1323 | 279 |
280 if (s->state) { | |
281 /* preserve tag */ | |
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282 s->arg_start = s->buffer->pos; |
1323 | 283 |
284 } else { | |
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285 if (s->buffer->pos == s->buffer->last) { |
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286 s->buffer->pos = s->buffer->start; |
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287 s->buffer->last = s->buffer->start; |
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288 } |
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289 |
1323 | 290 s->tag.len = 0; |
291 } | |
527 | 292 } |
293 | |
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294 if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
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295 ngx_mail_session_internal_server_error(s); |
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296 return; |
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297 } |
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298 |
1136 | 299 ngx_mail_send(c->write); |
521 | 300 } |
301 | |
302 | |
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303 static ngx_int_t |
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304 ngx_mail_imap_login(ngx_mail_session_t *s, ngx_connection_t *c) |
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305 { |
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306 ngx_str_t *arg; |
1479 | 307 |
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308 #if (NGX_MAIL_SSL) |
1479 | 309 if (ngx_mail_starttls_only(s, c)) { |
310 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
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311 } |
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312 #endif |
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313 |
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314 arg = s->args.elts; |
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315 |
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316 if (s->args.nelts != 2 || arg[0].len == 0) { |
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317 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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318 } |
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319 |
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320 s->login.len = arg[0].len; |
2049 | 321 s->login.data = ngx_pnalloc(c->pool, s->login.len); |
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322 if (s->login.data == NULL) { |
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323 return NGX_ERROR; |
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324 } |
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325 |
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326 ngx_memcpy(s->login.data, arg[0].data, s->login.len); |
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327 |
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328 s->passwd.len = arg[1].len; |
2049 | 329 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len); |
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330 if (s->passwd.data == NULL) { |
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331 return NGX_ERROR; |
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332 } |
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333 |
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334 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len); |
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335 |
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336 #if (NGX_DEBUG_MAIL_PASSWD) |
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337 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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338 "imap login:\"%V\" passwd:\"%V\"", |
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339 &s->login, &s->passwd); |
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340 #else |
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341 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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342 "imap login:\"%V\"", &s->login); |
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343 #endif |
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344 |
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345 return NGX_DONE; |
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346 } |
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347 |
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348 |
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349 static ngx_int_t |
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350 ngx_mail_imap_authenticate(ngx_mail_session_t *s, ngx_connection_t *c) |
420
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351 { |
1479 | 352 ngx_int_t rc; |
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353 ngx_mail_core_srv_conf_t *cscf; |
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354 ngx_mail_imap_srv_conf_t *iscf; |
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355 |
1479 | 356 #if (NGX_MAIL_SSL) |
357 if (ngx_mail_starttls_only(s, c)) { | |
358 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
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359 } |
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360 #endif |
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361 |
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362 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module); |
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363 |
1479 | 364 rc = ngx_mail_auth_parse(s, c); |
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365 |
1479 | 366 switch (rc) { |
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367 |
1479 | 368 case NGX_MAIL_AUTH_LOGIN: |
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369 |
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370 ngx_str_set(&s->out, imap_username); |
1479 | 371 s->mail_state = ngx_imap_auth_login_username; |
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372 |
1479 | 373 return NGX_OK; |
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374 |
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375 case NGX_MAIL_AUTH_LOGIN_USERNAME: |
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376 |
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377 ngx_str_set(&s->out, imap_password); |
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378 s->mail_state = ngx_imap_auth_login_password; |
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379 |
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380 return ngx_mail_auth_login_username(s, c, 1); |
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381 |
1479 | 382 case NGX_MAIL_AUTH_PLAIN: |
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383 |
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384 ngx_str_set(&s->out, imap_plain_next); |
1479 | 385 s->mail_state = ngx_imap_auth_plain; |
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386 |
1479 | 387 return NGX_OK; |
388 | |
389 case NGX_MAIL_AUTH_CRAM_MD5: | |
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390 |
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391 if (!(iscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) { |
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392 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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393 } |
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394 |
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395 if (s->salt.data == NULL) { |
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396 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
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397 |
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398 if (ngx_mail_salt(s, c, cscf) != NGX_OK) { |
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399 return NGX_ERROR; |
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400 } |
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401 } |
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402 |
1479 | 403 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) { |
404 s->mail_state = ngx_imap_auth_cram_md5; | |
405 return NGX_OK; | |
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406 } |
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407 |
1479 | 408 return NGX_ERROR; |
6774
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Mail: support SASL EXTERNAL (RFC 4422).
Rob N ★ <robn@fastmail.com>
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409 |
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Mail: support SASL EXTERNAL (RFC 4422).
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410 case NGX_MAIL_AUTH_EXTERNAL: |
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411 |
6869
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Mail: make it possible to disable SASL EXTERNAL.
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412 if (!(iscf->auth_methods & NGX_MAIL_AUTH_EXTERNAL_ENABLED)) { |
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413 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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414 } |
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415 |
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416 ngx_str_set(&s->out, imap_username); |
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417 s->mail_state = ngx_imap_auth_external; |
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418 |
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419 return NGX_OK; |
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420 } |
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421 |
1479 | 422 return rc; |
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423 } |
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424 |
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425 |
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426 static ngx_int_t |
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427 ngx_mail_imap_capability(ngx_mail_session_t *s, ngx_connection_t *c) |
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428 { |
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429 ngx_mail_imap_srv_conf_t *iscf; |
420
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430 |
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431 iscf = ngx_mail_get_module_srv_conf(s, ngx_mail_imap_module); |
809 | 432 |
1322 | 433 #if (NGX_MAIL_SSL) |
434 | |
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|
435 if (c->ssl == NULL) { |
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436 ngx_mail_ssl_conf_t *sslcf; |
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437 |
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438 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
809 | 439 |
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440 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) { |
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441 s->text = iscf->starttls_capability; |
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442 return NGX_OK; |
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443 } |
1136 | 444 |
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445 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) { |
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446 s->text = iscf->starttls_only_capability; |
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447 return NGX_OK; |
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448 } |
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449 } |
1322 | 450 #endif |
451 | |
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452 s->text = iscf->capability; |
894
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workaround for Eudora for Mac: it sends
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diff
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|
453 |
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454 return NGX_OK; |
4f7dca9c37f0
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|
455 } |
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diff
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|
456 |
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|
457 |
521 | 458 static ngx_int_t |
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459 ngx_mail_imap_starttls(ngx_mail_session_t *s, ngx_connection_t *c) |
420
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460 { |
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461 #if (NGX_MAIL_SSL) |
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462 ngx_mail_ssl_conf_t *sslcf; |
1136 | 463 |
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464 if (c->ssl == NULL) { |
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465 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
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|
466 if (sslcf->starttls) { |
7843
b38728495e1a
Mail: IMAP pipelining support.
Maxim Dounin <mdounin@mdounin.ru>
parents:
7841
diff
changeset
|
467 s->buffer->pos = s->buffer->start; |
b38728495e1a
Mail: IMAP pipelining support.
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7841
diff
changeset
|
468 s->buffer->last = s->buffer->start; |
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469 c->read->handler = ngx_mail_starttls_handler; |
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470 return NGX_OK; |
539 | 471 } |
472 } | |
473 | |
474 #endif | |
475 | |
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|
476 return NGX_MAIL_PARSE_INVALID_COMMAND; |
417
0526206251f6
nginx-0.0.10-2004-09-07-19:29:22 import
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415
diff
changeset
|
477 } |