Mercurial > hg > nginx
annotate src/mail/ngx_mail_pop3_handler.c @ 7790:da0a85e91587
Mail: added missing event handling after reading data.
If we need to be notified about further events, ngx_handle_read_event()
needs to be called after a read event is processed. Without this,
an event can be removed from the kernel and won't be reported again,
notably when using oneshot event methods, such as eventport on Solaris.
For consistency, existing ngx_handle_read_event() call removed from
ngx_mail_read_command(), as this call only covers one of the code paths
where ngx_mail_read_command() returns NGX_AGAIN. Instead, appropriate
processing added to the callers, covering all code paths where NGX_AGAIN
is returned.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Fri, 05 Mar 2021 17:16:17 +0300 |
parents | ab6257dac2a8 |
children | 815c63581be4 |
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 |
413
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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; |
417
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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 } | |
419
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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; |
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141 |
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142 if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
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143 ngx_mail_close_connection(c); |
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144 return; |
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145 } |
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146 |
539 | 147 return; |
148 } | |
149 | |
150 s->blocked = 0; | |
151 | |
1482 | 152 rc = ngx_mail_read_command(s, c); |
1136 | 153 |
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154 if (rc == NGX_AGAIN) { |
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155 if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
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156 ngx_mail_session_internal_server_error(s); |
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157 return; |
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158 } |
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159 |
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160 return; |
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161 } |
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162 |
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163 if (rc == NGX_ERROR) { |
1136 | 164 return; |
165 } | |
166 | |
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167 ngx_str_set(&s->out, pop3_ok); |
1136 | 168 |
169 if (rc == NGX_OK) { | |
170 switch (s->mail_state) { | |
171 | |
172 case ngx_pop3_start: | |
173 | |
174 switch (s->command) { | |
175 | |
176 case NGX_POP3_USER: | |
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177 rc = ngx_mail_pop3_user(s, c); |
1136 | 178 break; |
179 | |
180 case NGX_POP3_CAPA: | |
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181 rc = ngx_mail_pop3_capa(s, c, 1); |
1136 | 182 break; |
183 | |
184 case NGX_POP3_APOP: | |
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185 rc = ngx_mail_pop3_apop(s, c); |
1136 | 186 break; |
187 | |
188 case NGX_POP3_AUTH: | |
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189 rc = ngx_mail_pop3_auth(s, c); |
1136 | 190 break; |
191 | |
192 case NGX_POP3_QUIT: | |
193 s->quit = 1; | |
194 break; | |
195 | |
196 case NGX_POP3_NOOP: | |
197 break; | |
198 | |
199 case NGX_POP3_STLS: | |
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200 rc = ngx_mail_pop3_stls(s, c); |
1136 | 201 break; |
202 | |
203 default: | |
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204 rc = NGX_MAIL_PARSE_INVALID_COMMAND; |
1136 | 205 break; |
206 } | |
207 | |
208 break; | |
209 | |
210 case ngx_pop3_user: | |
211 | |
212 switch (s->command) { | |
213 | |
214 case NGX_POP3_PASS: | |
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215 rc = ngx_mail_pop3_pass(s, c); |
1136 | 216 break; |
217 | |
218 case NGX_POP3_CAPA: | |
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219 rc = ngx_mail_pop3_capa(s, c, 0); |
1136 | 220 break; |
221 | |
222 case NGX_POP3_QUIT: | |
223 s->quit = 1; | |
224 break; | |
225 | |
226 case NGX_POP3_NOOP: | |
227 break; | |
228 | |
229 default: | |
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230 rc = NGX_MAIL_PARSE_INVALID_COMMAND; |
1136 | 231 break; |
232 } | |
233 | |
234 break; | |
235 | |
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236 /* suppress warnings */ |
1136 | 237 case ngx_pop3_passwd: |
238 break; | |
239 | |
240 case ngx_pop3_auth_login_username: | |
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241 rc = ngx_mail_auth_login_username(s, c, 0); |
1136 | 242 |
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243 ngx_str_set(&s->out, pop3_password); |
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244 s->mail_state = ngx_pop3_auth_login_password; |
1136 | 245 break; |
246 | |
247 case ngx_pop3_auth_login_password: | |
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248 rc = ngx_mail_auth_login_password(s, c); |
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249 break; |
1136 | 250 |
251 case ngx_pop3_auth_plain: | |
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252 rc = ngx_mail_auth_plain(s, c, 0); |
1136 | 253 break; |
254 | |
255 case ngx_pop3_auth_cram_md5: | |
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256 rc = ngx_mail_auth_cram_md5(s, c); |
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257 break; |
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258 |
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259 case ngx_pop3_auth_external: |
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260 rc = ngx_mail_auth_external(s, c, 0); |
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261 break; |
1136 | 262 } |
263 } | |
264 | |
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265 switch (rc) { |
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266 |
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267 case NGX_DONE: |
1482 | 268 ngx_mail_auth(s, c); |
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269 return; |
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270 |
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271 case NGX_ERROR: |
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272 ngx_mail_session_internal_server_error(s); |
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273 return; |
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274 |
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275 case NGX_MAIL_PARSE_INVALID_COMMAND: |
1136 | 276 s->mail_state = ngx_pop3_start; |
277 s->state = 0; | |
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278 |
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279 ngx_str_set(&s->out, pop3_invalid_command); |
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280 |
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281 /* fall through */ |
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282 |
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283 case NGX_OK: |
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284 |
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285 s->args.nelts = 0; |
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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 if (s->state) { |
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290 s->arg_start = s->buffer->start; |
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291 } |
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292 |
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293 if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
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294 ngx_mail_session_internal_server_error(s); |
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295 return; |
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296 } |
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297 |
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298 ngx_mail_send(c->write); |
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299 } |
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300 } |
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301 |
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302 static ngx_int_t |
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303 ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c) |
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304 { |
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305 ngx_str_t *arg; |
1479 | 306 |
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307 #if (NGX_MAIL_SSL) |
1479 | 308 if (ngx_mail_starttls_only(s, c)) { |
309 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
1136 | 310 } |
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311 #endif |
1136 | 312 |
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313 if (s->args.nelts != 1) { |
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314 return NGX_MAIL_PARSE_INVALID_COMMAND; |
1136 | 315 } |
316 | |
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317 arg = s->args.elts; |
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318 s->login.len = arg[0].len; |
2049 | 319 s->login.data = ngx_pnalloc(c->pool, s->login.len); |
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320 if (s->login.data == NULL) { |
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321 return NGX_ERROR; |
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322 } |
1136 | 323 |
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324 ngx_memcpy(s->login.data, arg[0].data, s->login.len); |
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325 |
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326 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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327 "pop3 login: \"%V\"", &s->login); |
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328 |
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329 s->mail_state = ngx_pop3_user; |
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330 |
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331 return NGX_OK; |
1136 | 332 } |
333 | |
334 | |
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335 static ngx_int_t |
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336 ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c) |
1136 | 337 { |
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338 ngx_str_t *arg; |
1136 | 339 |
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340 if (s->args.nelts != 1) { |
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341 return NGX_MAIL_PARSE_INVALID_COMMAND; |
527 | 342 } |
343 | |
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344 arg = s->args.elts; |
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345 s->passwd.len = arg[0].len; |
2049 | 346 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len); |
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347 if (s->passwd.data == NULL) { |
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348 return NGX_ERROR; |
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349 } |
1323 | 350 |
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351 ngx_memcpy(s->passwd.data, arg[0].data, s->passwd.len); |
1323 | 352 |
353 #if (NGX_DEBUG_MAIL_PASSWD) | |
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354 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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355 "pop3 passwd: \"%V\"", &s->passwd); |
1323 | 356 #endif |
357 | |
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358 return NGX_DONE; |
521 | 359 } |
360 | |
361 | |
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362 static ngx_int_t |
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363 ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c, ngx_int_t stls) |
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364 { |
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365 ngx_mail_pop3_srv_conf_t *pscf; |
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366 |
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367 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
809 | 368 |
1322 | 369 #if (NGX_MAIL_SSL) |
370 | |
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371 if (stls && c->ssl == NULL) { |
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372 ngx_mail_ssl_conf_t *sslcf; |
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373 |
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374 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
1322 | 375 |
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376 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) { |
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377 s->out = pscf->starttls_capability; |
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378 return NGX_OK; |
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379 } |
809 | 380 |
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381 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) { |
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382 s->out = pscf->starttls_only_capability; |
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383 return NGX_OK; |
421
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384 } |
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385 } |
420
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386 |
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387 #endif |
420
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388 |
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389 s->out = pscf->capability; |
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390 return NGX_OK; |
417
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391 } |
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392 |
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393 |
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394 static ngx_int_t |
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395 ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c) |
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396 { |
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397 #if (NGX_MAIL_SSL) |
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398 ngx_mail_ssl_conf_t *sslcf; |
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399 |
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400 if (c->ssl == NULL) { |
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401 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
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402 if (sslcf->starttls) { |
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403 c->read->handler = ngx_mail_starttls_handler; |
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404 return NGX_OK; |
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405 } |
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406 } |
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407 |
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408 #endif |
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409 |
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410 return NGX_MAIL_PARSE_INVALID_COMMAND; |
855
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411 } |
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412 |
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413 |
521 | 414 static ngx_int_t |
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415 ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c) |
420
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416 { |
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417 ngx_str_t *arg; |
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418 ngx_mail_pop3_srv_conf_t *pscf; |
1479 | 419 |
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420 #if (NGX_MAIL_SSL) |
1479 | 421 if (ngx_mail_starttls_only(s, c)) { |
422 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
539 | 423 } |
424 #endif | |
425 | |
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426 if (s->args.nelts != 2) { |
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427 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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428 } |
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429 |
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430 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
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431 |
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432 if (!(pscf->auth_methods & NGX_MAIL_AUTH_APOP_ENABLED)) { |
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433 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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434 } |
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435 |
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436 arg = s->args.elts; |
543 | 437 |
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438 s->login.len = arg[0].len; |
2049 | 439 s->login.data = ngx_pnalloc(c->pool, s->login.len); |
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440 if (s->login.data == NULL) { |
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441 return NGX_ERROR; |
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442 } |
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443 |
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444 ngx_memcpy(s->login.data, arg[0].data, s->login.len); |
479 | 445 |
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446 s->passwd.len = arg[1].len; |
2049 | 447 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len); |
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448 if (s->passwd.data == NULL) { |
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449 return NGX_ERROR; |
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450 } |
479 | 451 |
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452 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len); |
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453 |
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454 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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455 "pop3 apop: \"%V\" \"%V\"", &s->login, &s->passwd); |
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456 |
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457 s->auth_method = NGX_MAIL_AUTH_APOP; |
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458 |
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459 return NGX_DONE; |
417
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460 } |
539 | 461 |
462 | |
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463 static ngx_int_t |
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464 ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c) |
541 | 465 { |
1479 | 466 ngx_int_t rc; |
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467 ngx_mail_pop3_srv_conf_t *pscf; |
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468 |
1479 | 469 #if (NGX_MAIL_SSL) |
470 if (ngx_mail_starttls_only(s, c)) { | |
471 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
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472 } |
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473 #endif |
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474 |
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475 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
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476 |
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477 if (s->args.nelts == 0) { |
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478 s->out = pscf->auth_capability; |
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479 s->state = 0; |
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480 |
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481 return NGX_OK; |
541 | 482 } |
577 | 483 |
1479 | 484 rc = ngx_mail_auth_parse(s, c); |
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485 |
1479 | 486 switch (rc) { |
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487 |
1479 | 488 case NGX_MAIL_AUTH_LOGIN: |
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489 |
3516
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diff
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|
490 ngx_str_set(&s->out, pop3_username); |
1479 | 491 s->mail_state = ngx_pop3_auth_login_username; |
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492 |
1479 | 493 return NGX_OK; |
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|
494 |
2495
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|
495 case NGX_MAIL_AUTH_LOGIN_USERNAME: |
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496 |
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497 ngx_str_set(&s->out, pop3_password); |
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498 s->mail_state = ngx_pop3_auth_login_password; |
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499 |
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500 return ngx_mail_auth_login_username(s, c, 1); |
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501 |
1479 | 502 case NGX_MAIL_AUTH_PLAIN: |
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503 |
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diff
changeset
|
504 ngx_str_set(&s->out, pop3_next); |
1479 | 505 s->mail_state = ngx_pop3_auth_plain; |
541 | 506 |
1479 | 507 return NGX_OK; |
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508 |
1479 | 509 case NGX_MAIL_AUTH_CRAM_MD5: |
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|
510 |
1487
f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1486
diff
changeset
|
511 if (!(pscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) { |
1476
67578e966dcc
split pop3, imap, and smtp handlers
Igor Sysoev <igor@sysoev.ru>
parents:
1472
diff
changeset
|
512 return NGX_MAIL_PARSE_INVALID_COMMAND; |
67578e966dcc
split pop3, imap, and smtp handlers
Igor Sysoev <igor@sysoev.ru>
parents:
1472
diff
changeset
|
513 } |
541 | 514 |
1479 | 515 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) { |
516 s->mail_state = ngx_pop3_auth_cram_md5; | |
517 return NGX_OK; | |
1476
67578e966dcc
split pop3, imap, and smtp handlers
Igor Sysoev <igor@sysoev.ru>
parents:
1472
diff
changeset
|
518 } |
67578e966dcc
split pop3, imap, and smtp handlers
Igor Sysoev <igor@sysoev.ru>
parents:
1472
diff
changeset
|
519 |
1479 | 520 return NGX_ERROR; |
6774
bcb107bb89cd
Mail: support SASL EXTERNAL (RFC 4422).
Rob N ★ <robn@fastmail.com>
parents:
4499
diff
changeset
|
521 |
bcb107bb89cd
Mail: support SASL EXTERNAL (RFC 4422).
Rob N ★ <robn@fastmail.com>
parents:
4499
diff
changeset
|
522 case NGX_MAIL_AUTH_EXTERNAL: |
bcb107bb89cd
Mail: support SASL EXTERNAL (RFC 4422).
Rob N ★ <robn@fastmail.com>
parents:
4499
diff
changeset
|
523 |
6869
b2915d99ee8d
Mail: make it possible to disable SASL EXTERNAL.
Sergey Kandaurov <pluknet@nginx.com>
parents:
6774
diff
changeset
|
524 if (!(pscf->auth_methods & NGX_MAIL_AUTH_EXTERNAL_ENABLED)) { |
b2915d99ee8d
Mail: make it possible to disable SASL EXTERNAL.
Sergey Kandaurov <pluknet@nginx.com>
parents:
6774
diff
changeset
|
525 return NGX_MAIL_PARSE_INVALID_COMMAND; |
b2915d99ee8d
Mail: make it possible to disable SASL EXTERNAL.
Sergey Kandaurov <pluknet@nginx.com>
parents:
6774
diff
changeset
|
526 } |
b2915d99ee8d
Mail: make it possible to disable SASL EXTERNAL.
Sergey Kandaurov <pluknet@nginx.com>
parents:
6774
diff
changeset
|
527 |
6774
bcb107bb89cd
Mail: support SASL EXTERNAL (RFC 4422).
Rob N ★ <robn@fastmail.com>
parents:
4499
diff
changeset
|
528 ngx_str_set(&s->out, pop3_username); |
bcb107bb89cd
Mail: support SASL EXTERNAL (RFC 4422).
Rob N ★ <robn@fastmail.com>
parents:
4499
diff
changeset
|
529 s->mail_state = ngx_pop3_auth_external; |
bcb107bb89cd
Mail: support SASL EXTERNAL (RFC 4422).
Rob N ★ <robn@fastmail.com>
parents:
4499
diff
changeset
|
530 |
bcb107bb89cd
Mail: support SASL EXTERNAL (RFC 4422).
Rob N ★ <robn@fastmail.com>
parents:
4499
diff
changeset
|
531 return NGX_OK; |
541 | 532 } |
533 | |
1479 | 534 return rc; |
541 | 535 } |