Mercurial > hg > nginx
annotate src/mail/ngx_mail_smtp_handler.c @ 1480:a231e37a19ab
move event handling to protocol specific code,
it is required to support SMTP greeting delay
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 14 Sep 2007 10:42:19 +0000 |
parents | 2647950e047f |
children | b58ce1cf66da |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
441
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4 */ |
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5 |
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6 |
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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> |
417
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11 |
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12 |
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13 static ngx_int_t ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c); |
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14 static ngx_int_t ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c); |
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15 static ngx_int_t ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c); |
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16 static ngx_int_t ngx_mail_smtp_starttls(ngx_mail_session_t *s, |
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17 ngx_connection_t *c); |
413
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18 |
527 | 19 |
1136 | 20 static u_char smtp_ok[] = "250 2.0.0 OK" CRLF; |
21 static u_char smtp_bye[] = "221 2.0.0 Bye" CRLF; | |
22 static u_char smtp_next[] = "334 " CRLF; | |
23 static u_char smtp_username[] = "334 VXNlcm5hbWU6" CRLF; | |
24 static u_char smtp_password[] = "334 UGFzc3dvcmQ6" CRLF; | |
25 static u_char smtp_invalid_command[] = "500 5.5.1 Invalid command" CRLF; | |
26 static u_char smtp_invalid_argument[] = "501 5.5.4 Invalid argument" CRLF; | |
27 static u_char smtp_auth_required[] = "530 5.7.1 Authentication required" CRLF; | |
28 | |
521 | 29 |
30 void | |
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31 ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c) |
413
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32 { |
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33 ngx_mail_core_srv_conf_t *cscf; |
641 | 34 |
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35 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
541 | 36 |
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37 if (cscf->smtp_auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) { |
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38 if (ngx_mail_salt(s, c, cscf) != NGX_OK) { |
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39 ngx_mail_session_internal_server_error(s); |
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40 return; |
641 | 41 } |
42 } | |
43 | |
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44 s->out = cscf->smtp_greeting; |
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45 |
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46 c->read->handler = ngx_mail_smtp_init_protocol; |
583 | 47 |
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48 ngx_add_timer(c->read, cscf->timeout); |
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49 |
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50 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) { |
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51 ngx_mail_close_connection(c); |
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52 } |
539 | 53 |
1136 | 54 ngx_mail_send(c->write); |
539 | 55 } |
56 | |
57 | |
58 void | |
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59 ngx_mail_smtp_init_protocol(ngx_event_t *rev) |
539 | 60 { |
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61 ngx_connection_t *c; |
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62 ngx_mail_session_t *s; |
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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 } |
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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 s->buffer = ngx_create_temp_buf(c->pool, 512); |
583 | 86 if (s->buffer == NULL) { |
1136 | 87 ngx_mail_session_internal_server_error(s); |
583 | 88 return; |
89 } | |
419
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90 } |
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91 |
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92 s->mail_state = ngx_smtp_start; |
1477 | 93 c->read->handler = ngx_mail_smtp_auth_state; |
1136 | 94 |
1477 | 95 ngx_mail_smtp_auth_state(rev); |
521 | 96 } |
97 | |
98 | |
527 | 99 void |
1477 | 100 ngx_mail_smtp_auth_state(ngx_event_t *rev) |
420
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101 { |
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102 ngx_int_t rc; |
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103 ngx_connection_t *c; |
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104 ngx_mail_session_t *s; |
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105 |
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106 c = rev->data; |
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107 s = c->data; |
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108 |
1136 | 109 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp auth state"); |
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110 |
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111 if (rev->timedout) { |
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112 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); |
577 | 113 c->timedout = 1; |
1136 | 114 ngx_mail_close_connection(c); |
423
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115 return; |
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116 } |
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117 |
539 | 118 if (s->out.len) { |
1136 | 119 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp send handler busy"); |
539 | 120 s->blocked = 1; |
121 return; | |
122 } | |
123 | |
124 s->blocked = 0; | |
125 | |
1136 | 126 rc = ngx_mail_read_command(s); |
420
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127 |
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128 if (rc == NGX_AGAIN || rc == NGX_ERROR) { |
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129 return; |
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130 } |
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131 |
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132 s->out.len = sizeof(smtp_ok) - 1; |
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133 s->out.data = smtp_ok; |
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134 |
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135 if (rc == NGX_OK) { |
1136 | 136 switch (s->mail_state) { |
421
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137 |
1136 | 138 case ngx_smtp_start: |
421
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139 |
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140 switch (s->command) { |
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141 |
1136 | 142 case NGX_SMTP_HELO: |
143 case NGX_SMTP_EHLO: | |
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144 rc = ngx_mail_smtp_helo(s, c); |
809 | 145 break; |
146 | |
1136 | 147 case NGX_SMTP_AUTH: |
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148 rc = ngx_mail_smtp_auth(s, c); |
800 | 149 break; |
150 | |
1136 | 151 case NGX_SMTP_QUIT: |
539 | 152 s->quit = 1; |
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153 s->out.len = sizeof(smtp_bye) - 1; |
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154 s->out.data = smtp_bye; |
527 | 155 break; |
156 | |
1136 | 157 case NGX_SMTP_MAIL: |
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158 rc = ngx_mail_smtp_mail(s, c); |
583 | 159 break; |
160 | |
1136 | 161 case NGX_SMTP_NOOP: |
162 case NGX_SMTP_RSET: | |
421
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163 break; |
1322 | 164 |
165 case NGX_SMTP_STARTTLS: | |
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166 rc = ngx_mail_smtp_starttls(s, c); |
1322 | 167 break; |
168 | |
169 default: | |
170 rc = NGX_MAIL_PARSE_INVALID_COMMAND; | |
171 break; | |
421
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172 } |
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173 |
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174 break; |
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175 |
1136 | 176 case ngx_smtp_auth_login_username: |
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177 rc = ngx_mail_auth_login_username(s, c); |
809 | 178 |
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179 s->out.len = sizeof(smtp_password) - 1; |
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180 s->out.data = smtp_password; |
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181 s->mail_state = ngx_smtp_auth_login_password; |
809 | 182 break; |
183 | |
1136 | 184 case ngx_smtp_auth_login_password: |
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185 rc = ngx_mail_auth_login_password(s, c); |
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186 break; |
809 | 187 |
1136 | 188 case ngx_smtp_auth_plain: |
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189 rc = ngx_mail_auth_plain(s, c, 0); |
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190 break; |
809 | 191 |
1136 | 192 case ngx_smtp_auth_cram_md5: |
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193 rc = ngx_mail_auth_cram_md5(s, c); |
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194 break; |
421
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195 } |
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196 } |
420
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197 |
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198 switch (rc) { |
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199 |
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200 case NGX_DONE: |
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201 ngx_mail_auth(s); |
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202 return; |
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203 |
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204 case NGX_ERROR: |
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205 ngx_mail_session_internal_server_error(s); |
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206 return; |
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207 |
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208 case NGX_MAIL_PARSE_INVALID_COMMAND: |
1136 | 209 s->mail_state = ngx_smtp_start; |
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210 s->state = 0; |
420
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211 |
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212 s->out.len = sizeof(smtp_invalid_command) - 1; |
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213 s->out.data = smtp_invalid_command; |
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214 |
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215 /* fall through */ |
539 | 216 |
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217 case NGX_OK: |
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218 s->args.nelts = 0; |
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219 s->buffer->pos = s->buffer->start; |
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220 s->buffer->last = s->buffer->start; |
810 | 221 |
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222 if (s->state) { |
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223 s->arg_start = s->buffer->start; |
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224 } |
539 | 225 |
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226 ngx_mail_send(c->write); |
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227 } |
417
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228 } |
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229 |
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230 |
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231 static ngx_int_t |
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232 ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c) |
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233 { |
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234 ngx_str_t *arg; |
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235 ngx_mail_core_srv_conf_t *cscf; |
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236 #if (NGX_MAIL_SSL) |
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237 ngx_mail_ssl_conf_t *sslcf; |
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238 #endif |
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239 |
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240 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
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241 |
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242 if (s->args.nelts != 1) { |
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243 s->out.len = sizeof(smtp_invalid_argument) - 1; |
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244 s->out.data = smtp_invalid_argument; |
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245 s->state = 0; |
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246 return NGX_OK; |
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247 } |
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248 |
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249 arg = s->args.elts; |
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250 |
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251 s->smtp_helo.len = arg[0].len; |
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252 |
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253 s->smtp_helo.data = ngx_palloc(c->pool, arg[0].len); |
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254 if (s->smtp_helo.data == NULL) { |
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255 return NGX_ERROR; |
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256 } |
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257 |
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258 ngx_memcpy(s->smtp_helo.data, arg[0].data, arg[0].len); |
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259 |
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260 if (s->command == NGX_SMTP_HELO) { |
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261 s->out = cscf->smtp_server_name; |
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262 |
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263 } else { |
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264 s->esmtp = 1; |
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265 |
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266 #if (NGX_MAIL_SSL) |
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267 |
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268 if (c->ssl == NULL) { |
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269 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
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270 |
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271 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) { |
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272 s->out = cscf->smtp_starttls_capability; |
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273 return NGX_OK; |
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274 } |
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275 |
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276 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) { |
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277 s->out = cscf->smtp_starttls_only_capability; |
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278 return NGX_OK; |
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279 } |
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280 } |
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281 #endif |
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282 |
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283 s->out = cscf->smtp_capability; |
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284 } |
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285 |
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286 return NGX_OK; |
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287 } |
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288 |
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289 |
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290 static ngx_int_t |
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291 ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c) |
525 | 292 { |
1479 | 293 ngx_int_t rc; |
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294 ngx_mail_core_srv_conf_t *cscf; |
525 | 295 |
1479 | 296 #if (NGX_MAIL_SSL) |
297 if (ngx_mail_starttls_only(s, c)) { | |
298 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
539 | 299 } |
300 #endif | |
301 | |
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302 if (s->args.nelts == 0) { |
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303 s->out.len = sizeof(smtp_invalid_argument) - 1; |
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304 s->out.data = smtp_invalid_argument; |
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305 s->state = 0; |
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306 return NGX_OK; |
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307 } |
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308 |
1479 | 309 rc = ngx_mail_auth_parse(s, c); |
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310 |
1479 | 311 switch (rc) { |
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312 |
1479 | 313 case NGX_MAIL_AUTH_LOGIN: |
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314 |
1479 | 315 s->out.len = sizeof(smtp_username) - 1; |
316 s->out.data = smtp_username; | |
317 s->mail_state = ngx_smtp_auth_login_username; | |
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318 |
1479 | 319 return NGX_OK; |
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320 |
1479 | 321 case NGX_MAIL_AUTH_PLAIN: |
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322 |
1479 | 323 s->out.len = sizeof(smtp_next) - 1; |
324 s->out.data = smtp_next; | |
325 s->mail_state = ngx_smtp_auth_plain; | |
543 | 326 |
1479 | 327 return NGX_OK; |
328 | |
329 case NGX_MAIL_AUTH_CRAM_MD5: | |
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330 |
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331 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
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332 |
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333 if (!(cscf->smtp_auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) { |
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334 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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335 } |
479 | 336 |
1479 | 337 if (ngx_mail_auth_cram_md5_salt(s, c, "334 ", 4) == NGX_OK) { |
338 s->mail_state = ngx_smtp_auth_cram_md5; | |
339 return NGX_OK; | |
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340 } |
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341 |
1479 | 342 return NGX_ERROR; |
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343 } |
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344 |
1479 | 345 return rc; |
417
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346 } |
539 | 347 |
348 | |
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349 static ngx_int_t |
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350 ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c) |
541 | 351 { |
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352 u_char ch; |
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353 ngx_str_t mail; |
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354 ngx_uint_t i; |
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355 |
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356 if (c->log->log_level >= NGX_LOG_INFO) { |
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357 mail.len = s->buffer->last - s->buffer->start; |
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358 mail.data = s->buffer->start; |
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359 |
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360 for (i = 0; i < mail.len; i++) { |
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361 ch = mail.data[i]; |
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362 |
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363 if (ch != CR && ch != LF) { |
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364 continue; |
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365 } |
541 | 366 |
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367 mail.data[i] = ' '; |
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368 } |
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369 |
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370 while (i) { |
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371 if (mail.data[i - 1] != ' ') { |
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372 break; |
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373 } |
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374 |
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375 i--; |
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376 } |
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377 |
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378 mail.len = i; |
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379 |
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380 ngx_log_error(NGX_LOG_INFO, s->connection->log, 0, |
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381 "client was rejected: \"%V\"", &mail); |
541 | 382 } |
577 | 383 |
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384 s->out.len = sizeof(smtp_auth_required) - 1; |
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385 s->out.data = smtp_auth_required; |
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386 |
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387 return NGX_OK; |
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388 } |
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389 |
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390 |
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391 static ngx_int_t |
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392 ngx_mail_smtp_starttls(ngx_mail_session_t *s, ngx_connection_t *c) |
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393 { |
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394 #if (NGX_MAIL_SSL) |
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395 ngx_mail_ssl_conf_t *sslcf; |
541 | 396 |
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397 if (c->ssl == NULL) { |
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398 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
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399 if (sslcf->starttls) { |
541 | 400 |
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401 /* |
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402 * RFC3207 requires us to discard any knowledge |
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403 * obtained from client before STARTTLS. |
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404 */ |
541 | 405 |
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406 s->smtp_helo.len = 0; |
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407 s->smtp_helo.data = NULL; |
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408 |
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409 c->read->handler = ngx_mail_starttls_handler; |
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410 return NGX_OK; |
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411 } |
541 | 412 } |
413 | |
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414 #endif |
541 | 415 |
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416 return NGX_MAIL_PARSE_INVALID_COMMAND; |
541 | 417 } |