Mercurial > hg > nginx-quic
annotate src/mail/ngx_mail_pop3_handler.c @ 6360:93d70d87914c stable-1.8
Resolver: limited CNAME recursion.
Previously, the recursion was only limited for cached responses.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 26 Jan 2016 16:47:14 +0300 |
parents | 778ef9c3fd2d |
children | bcb107bb89cd |
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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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_pop3_module.h> |
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13 |
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14 |
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15 static ngx_int_t ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c); |
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16 static ngx_int_t ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c); |
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17 static ngx_int_t ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c, |
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18 ngx_int_t stls); |
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19 static ngx_int_t ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c); |
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20 static ngx_int_t ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c); |
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21 static ngx_int_t ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c); |
539 | 22 |
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23 |
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24 static u_char pop3_greeting[] = "+OK POP3 ready" CRLF; |
521 | 25 static u_char pop3_ok[] = "+OK" CRLF; |
809 | 26 static u_char pop3_next[] = "+ " CRLF; |
27 static u_char pop3_username[] = "+ VXNlcm5hbWU6" CRLF; | |
28 static u_char pop3_password[] = "+ UGFzc3dvcmQ6" CRLF; | |
521 | 29 static u_char pop3_invalid_command[] = "-ERR invalid command" CRLF; |
30 | |
31 | |
32 void | |
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33 ngx_mail_pop3_init_session(ngx_mail_session_t *s, ngx_connection_t *c) |
541 | 34 { |
800 | 35 u_char *p; |
1136 | 36 ngx_mail_core_srv_conf_t *cscf; |
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37 ngx_mail_pop3_srv_conf_t *pscf; |
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38 |
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39 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
1136 | 40 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
539 | 41 |
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42 if (pscf->auth_methods |
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43 & (NGX_MAIL_AUTH_APOP_ENABLED|NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) |
800 | 44 { |
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45 if (ngx_mail_salt(s, c, cscf) != NGX_OK) { |
1136 | 46 ngx_mail_session_internal_server_error(s); |
800 | 47 return; |
48 } | |
49 | |
2049 | 50 s->out.data = ngx_pnalloc(c->pool, sizeof(pop3_greeting) + s->salt.len); |
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51 if (s->out.data == NULL) { |
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52 ngx_mail_session_internal_server_error(s); |
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53 return; |
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54 } |
800 | 55 |
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56 p = ngx_cpymem(s->out.data, pop3_greeting, sizeof(pop3_greeting) - 3); |
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57 *p++ = ' '; |
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58 p = ngx_cpymem(p, s->salt.data, s->salt.len); |
800 | 59 |
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60 s->out.len = p - s->out.data; |
800 | 61 |
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62 } else { |
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63 ngx_str_set(&s->out, pop3_greeting); |
800 | 64 } |
65 | |
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66 c->read->handler = ngx_mail_pop3_init_protocol; |
539 | 67 |
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68 ngx_add_timer(c->read, cscf->timeout); |
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69 |
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70 if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
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71 ngx_mail_close_connection(c); |
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72 } |
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73 |
1136 | 74 ngx_mail_send(c->write); |
539 | 75 } |
76 | |
77 | |
78 void | |
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79 ngx_mail_pop3_init_protocol(ngx_event_t *rev) |
539 | 80 { |
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81 ngx_connection_t *c; |
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82 ngx_mail_session_t *s; |
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83 |
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84 c = rev->data; |
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85 |
541 | 86 c->log->action = "in auth state"; |
87 | |
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88 if (rev->timedout) { |
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89 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); |
577 | 90 c->timedout = 1; |
1136 | 91 ngx_mail_close_connection(c); |
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92 return; |
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93 } |
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94 |
539 | 95 s = c->data; |
521 | 96 |
419
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97 if (s->buffer == NULL) { |
583 | 98 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) |
99 == NGX_ERROR) | |
100 { | |
1136 | 101 ngx_mail_session_internal_server_error(s); |
583 | 102 return; |
103 } | |
104 | |
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105 s->buffer = ngx_create_temp_buf(c->pool, 128); |
583 | 106 if (s->buffer == NULL) { |
1136 | 107 ngx_mail_session_internal_server_error(s); |
583 | 108 return; |
109 } | |
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110 } |
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111 |
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112 s->mail_state = ngx_pop3_start; |
1477 | 113 c->read->handler = ngx_mail_pop3_auth_state; |
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114 |
1477 | 115 ngx_mail_pop3_auth_state(rev); |
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116 } |
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117 |
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118 |
527 | 119 void |
1477 | 120 ngx_mail_pop3_auth_state(ngx_event_t *rev) |
521 | 121 { |
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122 ngx_int_t rc; |
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123 ngx_connection_t *c; |
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124 ngx_mail_session_t *s; |
521 | 125 |
126 c = rev->data; | |
527 | 127 s = c->data; |
521 | 128 |
1136 | 129 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 auth state"); |
527 | 130 |
131 if (rev->timedout) { | |
132 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); | |
577 | 133 c->timedout = 1; |
1136 | 134 ngx_mail_close_connection(c); |
527 | 135 return; |
136 } | |
137 | |
539 | 138 if (s->out.len) { |
1136 | 139 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 send handler busy"); |
539 | 140 s->blocked = 1; |
141 return; | |
142 } | |
143 | |
144 s->blocked = 0; | |
145 | |
1482 | 146 rc = ngx_mail_read_command(s, c); |
1136 | 147 |
148 if (rc == NGX_AGAIN || rc == NGX_ERROR) { | |
149 return; | |
150 } | |
151 | |
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152 ngx_str_set(&s->out, pop3_ok); |
1136 | 153 |
154 if (rc == NGX_OK) { | |
155 switch (s->mail_state) { | |
156 | |
157 case ngx_pop3_start: | |
158 | |
159 switch (s->command) { | |
160 | |
161 case NGX_POP3_USER: | |
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162 rc = ngx_mail_pop3_user(s, c); |
1136 | 163 break; |
164 | |
165 case NGX_POP3_CAPA: | |
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166 rc = ngx_mail_pop3_capa(s, c, 1); |
1136 | 167 break; |
168 | |
169 case NGX_POP3_APOP: | |
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170 rc = ngx_mail_pop3_apop(s, c); |
1136 | 171 break; |
172 | |
173 case NGX_POP3_AUTH: | |
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174 rc = ngx_mail_pop3_auth(s, c); |
1136 | 175 break; |
176 | |
177 case NGX_POP3_QUIT: | |
178 s->quit = 1; | |
179 break; | |
180 | |
181 case NGX_POP3_NOOP: | |
182 break; | |
183 | |
184 case NGX_POP3_STLS: | |
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185 rc = ngx_mail_pop3_stls(s, c); |
1136 | 186 break; |
187 | |
188 default: | |
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189 rc = NGX_MAIL_PARSE_INVALID_COMMAND; |
1136 | 190 break; |
191 } | |
192 | |
193 break; | |
194 | |
195 case ngx_pop3_user: | |
196 | |
197 switch (s->command) { | |
198 | |
199 case NGX_POP3_PASS: | |
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200 rc = ngx_mail_pop3_pass(s, c); |
1136 | 201 break; |
202 | |
203 case NGX_POP3_CAPA: | |
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204 rc = ngx_mail_pop3_capa(s, c, 0); |
1136 | 205 break; |
206 | |
207 case NGX_POP3_QUIT: | |
208 s->quit = 1; | |
209 break; | |
210 | |
211 case NGX_POP3_NOOP: | |
212 break; | |
213 | |
214 default: | |
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215 rc = NGX_MAIL_PARSE_INVALID_COMMAND; |
1136 | 216 break; |
217 } | |
218 | |
219 break; | |
220 | |
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221 /* suppress warnings */ |
1136 | 222 case ngx_pop3_passwd: |
223 break; | |
224 | |
225 case ngx_pop3_auth_login_username: | |
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226 rc = ngx_mail_auth_login_username(s, c, 0); |
1136 | 227 |
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228 ngx_str_set(&s->out, pop3_password); |
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229 s->mail_state = ngx_pop3_auth_login_password; |
1136 | 230 break; |
231 | |
232 case ngx_pop3_auth_login_password: | |
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233 rc = ngx_mail_auth_login_password(s, c); |
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234 break; |
1136 | 235 |
236 case ngx_pop3_auth_plain: | |
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237 rc = ngx_mail_auth_plain(s, c, 0); |
1136 | 238 break; |
239 | |
240 case ngx_pop3_auth_cram_md5: | |
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241 rc = ngx_mail_auth_cram_md5(s, c); |
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242 break; |
1136 | 243 } |
244 } | |
245 | |
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246 switch (rc) { |
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247 |
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248 case NGX_DONE: |
1482 | 249 ngx_mail_auth(s, c); |
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250 return; |
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251 |
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252 case NGX_ERROR: |
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253 ngx_mail_session_internal_server_error(s); |
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254 return; |
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255 |
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256 case NGX_MAIL_PARSE_INVALID_COMMAND: |
1136 | 257 s->mail_state = ngx_pop3_start; |
258 s->state = 0; | |
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259 |
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260 ngx_str_set(&s->out, pop3_invalid_command); |
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261 |
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262 /* fall through */ |
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263 |
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264 case NGX_OK: |
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265 |
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266 s->args.nelts = 0; |
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267 s->buffer->pos = s->buffer->start; |
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268 s->buffer->last = s->buffer->start; |
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269 |
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270 if (s->state) { |
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271 s->arg_start = s->buffer->start; |
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272 } |
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273 |
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274 ngx_mail_send(c->write); |
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275 } |
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276 } |
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277 |
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278 static ngx_int_t |
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279 ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c) |
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280 { |
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281 ngx_str_t *arg; |
1479 | 282 |
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283 #if (NGX_MAIL_SSL) |
1479 | 284 if (ngx_mail_starttls_only(s, c)) { |
285 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
1136 | 286 } |
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287 #endif |
1136 | 288 |
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289 if (s->args.nelts != 1) { |
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290 return NGX_MAIL_PARSE_INVALID_COMMAND; |
1136 | 291 } |
292 | |
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293 arg = s->args.elts; |
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294 s->login.len = arg[0].len; |
2049 | 295 s->login.data = ngx_pnalloc(c->pool, s->login.len); |
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296 if (s->login.data == NULL) { |
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297 return NGX_ERROR; |
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298 } |
1136 | 299 |
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300 ngx_memcpy(s->login.data, arg[0].data, s->login.len); |
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301 |
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302 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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303 "pop3 login: \"%V\"", &s->login); |
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304 |
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305 s->mail_state = ngx_pop3_user; |
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306 |
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307 return NGX_OK; |
1136 | 308 } |
309 | |
310 | |
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311 static ngx_int_t |
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312 ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c) |
1136 | 313 { |
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314 ngx_str_t *arg; |
1136 | 315 |
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316 if (s->args.nelts != 1) { |
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317 return NGX_MAIL_PARSE_INVALID_COMMAND; |
527 | 318 } |
319 | |
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320 arg = s->args.elts; |
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321 s->passwd.len = arg[0].len; |
2049 | 322 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len); |
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323 if (s->passwd.data == NULL) { |
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324 return NGX_ERROR; |
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325 } |
1323 | 326 |
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327 ngx_memcpy(s->passwd.data, arg[0].data, s->passwd.len); |
1323 | 328 |
329 #if (NGX_DEBUG_MAIL_PASSWD) | |
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330 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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331 "pop3 passwd: \"%V\"", &s->passwd); |
1323 | 332 #endif |
333 | |
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334 return NGX_DONE; |
521 | 335 } |
336 | |
337 | |
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338 static ngx_int_t |
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339 ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c, ngx_int_t stls) |
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340 { |
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341 ngx_mail_pop3_srv_conf_t *pscf; |
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342 |
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343 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
809 | 344 |
1322 | 345 #if (NGX_MAIL_SSL) |
346 | |
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347 if (stls && c->ssl == NULL) { |
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348 ngx_mail_ssl_conf_t *sslcf; |
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349 |
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350 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
1322 | 351 |
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352 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) { |
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353 s->out = pscf->starttls_capability; |
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354 return NGX_OK; |
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355 } |
809 | 356 |
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357 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) { |
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358 s->out = pscf->starttls_only_capability; |
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359 return NGX_OK; |
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360 } |
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361 } |
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362 |
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363 #endif |
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364 |
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365 s->out = pscf->capability; |
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366 return NGX_OK; |
417
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367 } |
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368 |
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369 |
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370 static ngx_int_t |
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371 ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c) |
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372 { |
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373 #if (NGX_MAIL_SSL) |
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374 ngx_mail_ssl_conf_t *sslcf; |
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375 |
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376 if (c->ssl == NULL) { |
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377 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
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378 if (sslcf->starttls) { |
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379 c->read->handler = ngx_mail_starttls_handler; |
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380 return NGX_OK; |
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381 } |
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382 } |
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383 |
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384 #endif |
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385 |
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386 return NGX_MAIL_PARSE_INVALID_COMMAND; |
855
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387 } |
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388 |
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389 |
521 | 390 static ngx_int_t |
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391 ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c) |
420
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392 { |
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393 ngx_str_t *arg; |
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394 ngx_mail_pop3_srv_conf_t *pscf; |
1479 | 395 |
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396 #if (NGX_MAIL_SSL) |
1479 | 397 if (ngx_mail_starttls_only(s, c)) { |
398 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
539 | 399 } |
400 #endif | |
401 | |
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402 if (s->args.nelts != 2) { |
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403 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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404 } |
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405 |
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406 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
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407 |
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408 if (!(pscf->auth_methods & NGX_MAIL_AUTH_APOP_ENABLED)) { |
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409 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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410 } |
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411 |
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412 arg = s->args.elts; |
543 | 413 |
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414 s->login.len = arg[0].len; |
2049 | 415 s->login.data = ngx_pnalloc(c->pool, s->login.len); |
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416 if (s->login.data == NULL) { |
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417 return NGX_ERROR; |
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418 } |
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419 |
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420 ngx_memcpy(s->login.data, arg[0].data, s->login.len); |
479 | 421 |
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422 s->passwd.len = arg[1].len; |
2049 | 423 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len); |
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424 if (s->passwd.data == NULL) { |
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425 return NGX_ERROR; |
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426 } |
479 | 427 |
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428 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len); |
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429 |
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430 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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431 "pop3 apop: \"%V\" \"%V\"", &s->login, &s->passwd); |
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432 |
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433 s->auth_method = NGX_MAIL_AUTH_APOP; |
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434 |
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435 return NGX_DONE; |
417
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436 } |
539 | 437 |
438 | |
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439 static ngx_int_t |
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440 ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c) |
541 | 441 { |
1479 | 442 ngx_int_t rc; |
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443 ngx_mail_pop3_srv_conf_t *pscf; |
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444 |
1479 | 445 #if (NGX_MAIL_SSL) |
446 if (ngx_mail_starttls_only(s, c)) { | |
447 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
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448 } |
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449 #endif |
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450 |
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451 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
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452 |
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453 if (s->args.nelts == 0) { |
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454 s->out = pscf->auth_capability; |
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455 s->state = 0; |
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456 |
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457 return NGX_OK; |
541 | 458 } |
577 | 459 |
1479 | 460 rc = ngx_mail_auth_parse(s, c); |
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461 |
1479 | 462 switch (rc) { |
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463 |
1479 | 464 case NGX_MAIL_AUTH_LOGIN: |
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465 |
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466 ngx_str_set(&s->out, pop3_username); |
1479 | 467 s->mail_state = ngx_pop3_auth_login_username; |
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468 |
1479 | 469 return NGX_OK; |
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470 |
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471 case NGX_MAIL_AUTH_LOGIN_USERNAME: |
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472 |
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473 ngx_str_set(&s->out, pop3_password); |
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474 s->mail_state = ngx_pop3_auth_login_password; |
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475 |
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476 return ngx_mail_auth_login_username(s, c, 1); |
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477 |
1479 | 478 case NGX_MAIL_AUTH_PLAIN: |
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479 |
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480 ngx_str_set(&s->out, pop3_next); |
1479 | 481 s->mail_state = ngx_pop3_auth_plain; |
541 | 482 |
1479 | 483 return NGX_OK; |
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484 |
1479 | 485 case NGX_MAIL_AUTH_CRAM_MD5: |
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486 |
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487 if (!(pscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) { |
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488 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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489 } |
541 | 490 |
1479 | 491 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) { |
492 s->mail_state = ngx_pop3_auth_cram_md5; | |
493 return NGX_OK; | |
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494 } |
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495 |
1479 | 496 return NGX_ERROR; |
541 | 497 } |
498 | |
1479 | 499 return rc; |
541 | 500 } |