Mercurial > hg > nginx-quic
annotate src/mail/ngx_mail_pop3_handler.c @ 4162:fb1375e8b68c stable-1.0
Merging r4036, r4055, r4056, r4057, r4058, r4059, r4060, r4061, r4062, r4063,
r4064:
Ranges related fixes:
The "max_ranges" directive.
"max_ranges 0" disables ranges support at all,
"max_ranges 1" allows the single range, etc.
By default number of ranges is unlimited, to be precise, 2^31-1.
If client requests more ranges than "max_ranges" permits,
nginx disables ranges and returns just the source response.
If total size of all ranges is greater than source response size,
then nginx disables ranges and returns just the source response.
This fix should not affect well-behaving applications but will defeat
DoS attempts exploiting malicious byte ranges.
Now unsatisfiable ranges are processed according to RFC 2616.
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 30 Sep 2011 14:06:08 +0000 |
parents | dd1570b6f237 |
children | d620f497c50f |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 #include <ngx_event.h> |
1136 | 10 #include <ngx_mail.h> |
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11 #include <ngx_mail_pop3_module.h> |
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13 |
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14 static ngx_int_t ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c); |
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15 static ngx_int_t ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c); |
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16 static ngx_int_t ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c, |
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17 ngx_int_t stls); |
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18 static ngx_int_t ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c); |
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19 static ngx_int_t ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c); |
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20 static ngx_int_t ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c); |
539 | 21 |
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22 |
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23 static u_char pop3_greeting[] = "+OK POP3 ready" CRLF; |
521 | 24 static u_char pop3_ok[] = "+OK" CRLF; |
809 | 25 static u_char pop3_next[] = "+ " CRLF; |
26 static u_char pop3_username[] = "+ VXNlcm5hbWU6" CRLF; | |
27 static u_char pop3_password[] = "+ UGFzc3dvcmQ6" CRLF; | |
521 | 28 static u_char pop3_invalid_command[] = "-ERR invalid command" CRLF; |
29 | |
30 | |
31 void | |
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32 ngx_mail_pop3_init_session(ngx_mail_session_t *s, ngx_connection_t *c) |
541 | 33 { |
800 | 34 u_char *p; |
1136 | 35 ngx_mail_core_srv_conf_t *cscf; |
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36 ngx_mail_pop3_srv_conf_t *pscf; |
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37 |
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38 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
1136 | 39 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
539 | 40 |
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41 if (pscf->auth_methods |
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42 & (NGX_MAIL_AUTH_APOP_ENABLED|NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) |
800 | 43 { |
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44 if (ngx_mail_salt(s, c, cscf) != NGX_OK) { |
1136 | 45 ngx_mail_session_internal_server_error(s); |
800 | 46 return; |
47 } | |
48 | |
2049 | 49 s->out.data = ngx_pnalloc(c->pool, sizeof(pop3_greeting) + s->salt.len); |
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50 if (s->out.data == NULL) { |
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51 ngx_mail_session_internal_server_error(s); |
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52 return; |
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53 } |
800 | 54 |
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55 p = ngx_cpymem(s->out.data, pop3_greeting, sizeof(pop3_greeting) - 3); |
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56 *p++ = ' '; |
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57 p = ngx_cpymem(p, s->salt.data, s->salt.len); |
800 | 58 |
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59 s->out.len = p - s->out.data; |
800 | 60 |
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61 } else { |
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62 ngx_str_set(&s->out, pop3_greeting); |
800 | 63 } |
64 | |
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65 c->read->handler = ngx_mail_pop3_init_protocol; |
539 | 66 |
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67 ngx_add_timer(c->read, cscf->timeout); |
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68 |
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69 if (ngx_handle_read_event(c->read, 0) != NGX_OK) { |
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70 ngx_mail_close_connection(c); |
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71 } |
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72 |
1136 | 73 ngx_mail_send(c->write); |
539 | 74 } |
75 | |
76 | |
77 void | |
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78 ngx_mail_pop3_init_protocol(ngx_event_t *rev) |
539 | 79 { |
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80 ngx_connection_t *c; |
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81 ngx_mail_session_t *s; |
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82 |
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83 c = rev->data; |
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84 |
541 | 85 c->log->action = "in auth state"; |
86 | |
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87 if (rev->timedout) { |
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88 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); |
577 | 89 c->timedout = 1; |
1136 | 90 ngx_mail_close_connection(c); |
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91 return; |
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92 } |
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93 |
539 | 94 s = c->data; |
521 | 95 |
419
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96 if (s->buffer == NULL) { |
583 | 97 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) |
98 == NGX_ERROR) | |
99 { | |
1136 | 100 ngx_mail_session_internal_server_error(s); |
583 | 101 return; |
102 } | |
103 | |
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104 s->buffer = ngx_create_temp_buf(c->pool, 128); |
583 | 105 if (s->buffer == NULL) { |
1136 | 106 ngx_mail_session_internal_server_error(s); |
583 | 107 return; |
108 } | |
419
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109 } |
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110 |
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111 s->mail_state = ngx_pop3_start; |
1477 | 112 c->read->handler = ngx_mail_pop3_auth_state; |
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113 |
1477 | 114 ngx_mail_pop3_auth_state(rev); |
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115 } |
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117 |
527 | 118 void |
1477 | 119 ngx_mail_pop3_auth_state(ngx_event_t *rev) |
521 | 120 { |
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121 ngx_int_t rc; |
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122 ngx_connection_t *c; |
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123 ngx_mail_session_t *s; |
521 | 124 |
125 c = rev->data; | |
527 | 126 s = c->data; |
521 | 127 |
1136 | 128 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 auth state"); |
527 | 129 |
130 if (rev->timedout) { | |
131 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); | |
577 | 132 c->timedout = 1; |
1136 | 133 ngx_mail_close_connection(c); |
527 | 134 return; |
135 } | |
136 | |
539 | 137 if (s->out.len) { |
1136 | 138 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 send handler busy"); |
539 | 139 s->blocked = 1; |
140 return; | |
141 } | |
142 | |
143 s->blocked = 0; | |
144 | |
1482 | 145 rc = ngx_mail_read_command(s, c); |
1136 | 146 |
147 if (rc == NGX_AGAIN || rc == NGX_ERROR) { | |
148 return; | |
149 } | |
150 | |
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151 ngx_str_set(&s->out, pop3_ok); |
1136 | 152 |
153 if (rc == NGX_OK) { | |
154 switch (s->mail_state) { | |
155 | |
156 case ngx_pop3_start: | |
157 | |
158 switch (s->command) { | |
159 | |
160 case NGX_POP3_USER: | |
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161 rc = ngx_mail_pop3_user(s, c); |
1136 | 162 break; |
163 | |
164 case NGX_POP3_CAPA: | |
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165 rc = ngx_mail_pop3_capa(s, c, 1); |
1136 | 166 break; |
167 | |
168 case NGX_POP3_APOP: | |
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169 rc = ngx_mail_pop3_apop(s, c); |
1136 | 170 break; |
171 | |
172 case NGX_POP3_AUTH: | |
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173 rc = ngx_mail_pop3_auth(s, c); |
1136 | 174 break; |
175 | |
176 case NGX_POP3_QUIT: | |
177 s->quit = 1; | |
178 break; | |
179 | |
180 case NGX_POP3_NOOP: | |
181 break; | |
182 | |
183 case NGX_POP3_STLS: | |
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184 rc = ngx_mail_pop3_stls(s, c); |
1136 | 185 break; |
186 | |
187 default: | |
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188 rc = NGX_MAIL_PARSE_INVALID_COMMAND; |
1136 | 189 break; |
190 } | |
191 | |
192 break; | |
193 | |
194 case ngx_pop3_user: | |
195 | |
196 switch (s->command) { | |
197 | |
198 case NGX_POP3_PASS: | |
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199 rc = ngx_mail_pop3_pass(s, c); |
1136 | 200 break; |
201 | |
202 case NGX_POP3_CAPA: | |
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203 rc = ngx_mail_pop3_capa(s, c, 0); |
1136 | 204 break; |
205 | |
206 case NGX_POP3_QUIT: | |
207 s->quit = 1; | |
208 break; | |
209 | |
210 case NGX_POP3_NOOP: | |
211 break; | |
212 | |
213 default: | |
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214 rc = NGX_MAIL_PARSE_INVALID_COMMAND; |
1136 | 215 break; |
216 } | |
217 | |
218 break; | |
219 | |
220 /* suppress warinings */ | |
221 case ngx_pop3_passwd: | |
222 break; | |
223 | |
224 case ngx_pop3_auth_login_username: | |
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225 rc = ngx_mail_auth_login_username(s, c, 0); |
1136 | 226 |
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227 ngx_str_set(&s->out, pop3_password); |
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228 s->mail_state = ngx_pop3_auth_login_password; |
1136 | 229 break; |
230 | |
231 case ngx_pop3_auth_login_password: | |
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232 rc = ngx_mail_auth_login_password(s, c); |
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233 break; |
1136 | 234 |
235 case ngx_pop3_auth_plain: | |
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236 rc = ngx_mail_auth_plain(s, c, 0); |
1136 | 237 break; |
238 | |
239 case ngx_pop3_auth_cram_md5: | |
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240 rc = ngx_mail_auth_cram_md5(s, c); |
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241 break; |
1136 | 242 } |
243 } | |
244 | |
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245 switch (rc) { |
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246 |
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247 case NGX_DONE: |
1482 | 248 ngx_mail_auth(s, c); |
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249 return; |
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250 |
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251 case NGX_ERROR: |
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252 ngx_mail_session_internal_server_error(s); |
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253 return; |
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254 |
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255 case NGX_MAIL_PARSE_INVALID_COMMAND: |
1136 | 256 s->mail_state = ngx_pop3_start; |
257 s->state = 0; | |
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258 |
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259 ngx_str_set(&s->out, pop3_invalid_command); |
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260 |
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261 /* fall through */ |
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262 |
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263 case NGX_OK: |
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264 |
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265 s->args.nelts = 0; |
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266 s->buffer->pos = s->buffer->start; |
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267 s->buffer->last = s->buffer->start; |
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268 |
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269 if (s->state) { |
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270 s->arg_start = s->buffer->start; |
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271 } |
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272 |
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273 ngx_mail_send(c->write); |
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274 } |
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275 } |
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276 |
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277 static ngx_int_t |
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278 ngx_mail_pop3_user(ngx_mail_session_t *s, ngx_connection_t *c) |
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279 { |
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280 ngx_str_t *arg; |
1479 | 281 |
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282 #if (NGX_MAIL_SSL) |
1479 | 283 if (ngx_mail_starttls_only(s, c)) { |
284 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
1136 | 285 } |
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286 #endif |
1136 | 287 |
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288 if (s->args.nelts != 1) { |
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289 return NGX_MAIL_PARSE_INVALID_COMMAND; |
1136 | 290 } |
291 | |
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292 arg = s->args.elts; |
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293 s->login.len = arg[0].len; |
2049 | 294 s->login.data = ngx_pnalloc(c->pool, s->login.len); |
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295 if (s->login.data == NULL) { |
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296 return NGX_ERROR; |
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297 } |
1136 | 298 |
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299 ngx_memcpy(s->login.data, arg[0].data, s->login.len); |
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300 |
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301 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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302 "pop3 login: \"%V\"", &s->login); |
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303 |
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304 s->mail_state = ngx_pop3_user; |
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305 |
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306 return NGX_OK; |
1136 | 307 } |
308 | |
309 | |
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310 static ngx_int_t |
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311 ngx_mail_pop3_pass(ngx_mail_session_t *s, ngx_connection_t *c) |
1136 | 312 { |
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313 ngx_str_t *arg; |
1136 | 314 |
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315 if (s->args.nelts != 1) { |
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316 return NGX_MAIL_PARSE_INVALID_COMMAND; |
527 | 317 } |
318 | |
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319 arg = s->args.elts; |
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320 s->passwd.len = arg[0].len; |
2049 | 321 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len); |
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322 if (s->passwd.data == NULL) { |
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323 return NGX_ERROR; |
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324 } |
1323 | 325 |
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326 ngx_memcpy(s->passwd.data, arg[0].data, s->passwd.len); |
1323 | 327 |
328 #if (NGX_DEBUG_MAIL_PASSWD) | |
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329 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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330 "pop3 passwd: \"%V\"", &s->passwd); |
1323 | 331 #endif |
332 | |
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333 return NGX_DONE; |
521 | 334 } |
335 | |
336 | |
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337 static ngx_int_t |
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338 ngx_mail_pop3_capa(ngx_mail_session_t *s, ngx_connection_t *c, ngx_int_t stls) |
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339 { |
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340 ngx_mail_pop3_srv_conf_t *pscf; |
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341 |
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342 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
809 | 343 |
1322 | 344 #if (NGX_MAIL_SSL) |
345 | |
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346 if (stls && c->ssl == NULL) { |
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347 ngx_mail_ssl_conf_t *sslcf; |
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348 |
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349 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
1322 | 350 |
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351 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) { |
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352 s->out = pscf->starttls_capability; |
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353 return NGX_OK; |
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354 } |
809 | 355 |
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356 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) { |
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357 s->out = pscf->starttls_only_capability; |
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358 return NGX_OK; |
421
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359 } |
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360 } |
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361 |
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362 #endif |
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363 |
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364 s->out = pscf->capability; |
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365 return NGX_OK; |
417
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366 } |
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367 |
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368 |
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369 static ngx_int_t |
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370 ngx_mail_pop3_stls(ngx_mail_session_t *s, ngx_connection_t *c) |
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371 { |
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372 #if (NGX_MAIL_SSL) |
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373 ngx_mail_ssl_conf_t *sslcf; |
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374 |
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375 if (c->ssl == NULL) { |
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376 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
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377 if (sslcf->starttls) { |
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378 c->read->handler = ngx_mail_starttls_handler; |
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379 return NGX_OK; |
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380 } |
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381 } |
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382 |
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383 #endif |
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384 |
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385 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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386 } |
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387 |
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388 |
521 | 389 static ngx_int_t |
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390 ngx_mail_pop3_apop(ngx_mail_session_t *s, ngx_connection_t *c) |
420
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391 { |
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392 ngx_str_t *arg; |
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393 ngx_mail_pop3_srv_conf_t *pscf; |
1479 | 394 |
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395 #if (NGX_MAIL_SSL) |
1479 | 396 if (ngx_mail_starttls_only(s, c)) { |
397 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
539 | 398 } |
399 #endif | |
400 | |
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401 if (s->args.nelts != 2) { |
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402 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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403 } |
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404 |
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405 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
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406 |
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407 if (!(pscf->auth_methods & NGX_MAIL_AUTH_APOP_ENABLED)) { |
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408 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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409 } |
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410 |
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411 arg = s->args.elts; |
543 | 412 |
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413 s->login.len = arg[0].len; |
2049 | 414 s->login.data = ngx_pnalloc(c->pool, s->login.len); |
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415 if (s->login.data == NULL) { |
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416 return NGX_ERROR; |
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417 } |
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418 |
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419 ngx_memcpy(s->login.data, arg[0].data, s->login.len); |
479 | 420 |
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421 s->passwd.len = arg[1].len; |
2049 | 422 s->passwd.data = ngx_pnalloc(c->pool, s->passwd.len); |
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423 if (s->passwd.data == NULL) { |
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424 return NGX_ERROR; |
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425 } |
479 | 426 |
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427 ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len); |
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428 |
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429 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0, |
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430 "pop3 apop: \"%V\" \"%V\"", &s->login, &s->passwd); |
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431 |
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432 s->auth_method = NGX_MAIL_AUTH_APOP; |
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433 |
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434 return NGX_DONE; |
417
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435 } |
539 | 436 |
437 | |
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438 static ngx_int_t |
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439 ngx_mail_pop3_auth(ngx_mail_session_t *s, ngx_connection_t *c) |
541 | 440 { |
1479 | 441 ngx_int_t rc; |
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442 ngx_mail_pop3_srv_conf_t *pscf; |
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443 |
1479 | 444 #if (NGX_MAIL_SSL) |
445 if (ngx_mail_starttls_only(s, c)) { | |
446 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
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447 } |
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448 #endif |
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449 |
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450 pscf = ngx_mail_get_module_srv_conf(s, ngx_mail_pop3_module); |
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451 |
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452 if (s->args.nelts == 0) { |
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453 s->out = pscf->auth_capability; |
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454 s->state = 0; |
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455 |
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456 return NGX_OK; |
541 | 457 } |
577 | 458 |
1479 | 459 rc = ngx_mail_auth_parse(s, c); |
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460 |
1479 | 461 switch (rc) { |
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462 |
1479 | 463 case NGX_MAIL_AUTH_LOGIN: |
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464 |
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465 ngx_str_set(&s->out, pop3_username); |
1479 | 466 s->mail_state = ngx_pop3_auth_login_username; |
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467 |
1479 | 468 return NGX_OK; |
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469 |
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470 case NGX_MAIL_AUTH_LOGIN_USERNAME: |
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471 |
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472 ngx_str_set(&s->out, pop3_password); |
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473 s->mail_state = ngx_pop3_auth_login_password; |
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474 |
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475 return ngx_mail_auth_login_username(s, c, 1); |
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476 |
1479 | 477 case NGX_MAIL_AUTH_PLAIN: |
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478 |
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479 ngx_str_set(&s->out, pop3_next); |
1479 | 480 s->mail_state = ngx_pop3_auth_plain; |
541 | 481 |
1479 | 482 return NGX_OK; |
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483 |
1479 | 484 case NGX_MAIL_AUTH_CRAM_MD5: |
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485 |
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486 if (!(pscf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) { |
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487 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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488 } |
541 | 489 |
1479 | 490 if (ngx_mail_auth_cram_md5_salt(s, c, "+ ", 2) == NGX_OK) { |
491 s->mail_state = ngx_pop3_auth_cram_md5; | |
492 return NGX_OK; | |
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493 } |
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494 |
1479 | 495 return NGX_ERROR; |
541 | 496 } |
497 | |
1479 | 498 return rc; |
541 | 499 } |