Mercurial > hg > nginx
annotate src/mail/ngx_mail_smtp_handler.c @ 1484:c788d2b877be
fix r1482
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 14 Sep 2007 14:56:46 +0000 |
parents | 46f364406994 |
children | b3488fc2675a |
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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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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12 |
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13 static void ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev); |
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14 static ngx_int_t ngx_mail_smtp_create_buffer(ngx_mail_session_t *s, |
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15 ngx_connection_t *c); |
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16 |
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17 static ngx_int_t ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c); |
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18 static ngx_int_t ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c); |
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19 static ngx_int_t ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c); |
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20 static ngx_int_t ngx_mail_smtp_starttls(ngx_mail_session_t *s, |
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21 ngx_connection_t *c); |
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22 |
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23 static ngx_int_t ngx_mail_smtp_discard_command(ngx_mail_session_t *s, |
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24 ngx_connection_t *c, char *err); |
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25 static void ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s, |
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26 ngx_connection_t *c, char *err); |
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27 |
527 | 28 |
1136 | 29 static u_char smtp_ok[] = "250 2.0.0 OK" CRLF; |
30 static u_char smtp_bye[] = "221 2.0.0 Bye" CRLF; | |
31 static u_char smtp_next[] = "334 " CRLF; | |
32 static u_char smtp_username[] = "334 VXNlcm5hbWU6" CRLF; | |
33 static u_char smtp_password[] = "334 UGFzc3dvcmQ6" CRLF; | |
34 static u_char smtp_invalid_command[] = "500 5.5.1 Invalid command" CRLF; | |
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35 static u_char smtp_invalid_pipelining[] = |
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36 "503 5.5.0 Improper use of SMTP command pipelining" CRLF; |
1136 | 37 static u_char smtp_invalid_argument[] = "501 5.5.4 Invalid argument" CRLF; |
38 static u_char smtp_auth_required[] = "530 5.7.1 Authentication required" CRLF; | |
39 | |
521 | 40 |
41 void | |
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42 ngx_mail_smtp_init_session(ngx_mail_session_t *s, ngx_connection_t *c) |
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43 { |
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44 ngx_msec_t timeout; |
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45 ngx_mail_core_srv_conf_t *cscf; |
641 | 46 |
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47 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
541 | 48 |
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49 if (cscf->smtp_auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) { |
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50 if (ngx_mail_salt(s, c, cscf) != NGX_OK) { |
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51 ngx_mail_session_internal_server_error(s); |
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52 return; |
641 | 53 } |
54 } | |
55 | |
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56 timeout = cscf->smtp_greeting_delay ? cscf->smtp_greeting_delay: |
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57 cscf->timeout; |
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58 ngx_add_timer(c->read, timeout); |
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59 |
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60 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) { |
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61 ngx_mail_close_connection(c); |
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62 } |
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63 |
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64 if (cscf->smtp_greeting_delay) { |
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65 c->read->handler = ngx_mail_smtp_invalid_pipelining; |
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66 return; |
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67 } |
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68 |
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69 c->read->handler = ngx_mail_smtp_init_protocol; |
583 | 70 |
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71 s->out = cscf->smtp_greeting; |
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72 |
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73 ngx_mail_send(c->write); |
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74 } |
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75 |
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76 |
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77 static void |
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78 ngx_mail_smtp_invalid_pipelining(ngx_event_t *rev) |
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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 ngx_mail_core_srv_conf_t *cscf; |
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83 |
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84 c = rev->data; |
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85 s = c->data; |
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86 |
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87 c->log->action = "in delay pipelining state"; |
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88 |
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89 if (rev->timedout) { |
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90 |
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91 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "delay greeting"); |
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92 |
1484 | 93 rev->timedout = 0; |
94 | |
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95 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
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96 |
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97 c->read->handler = ngx_mail_smtp_init_protocol; |
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98 |
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99 ngx_add_timer(c->read, cscf->timeout); |
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100 |
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101 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) { |
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102 ngx_mail_close_connection(c); |
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103 return; |
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104 } |
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105 |
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106 s->out = cscf->smtp_greeting; |
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107 |
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108 } else { |
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109 |
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110 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "invalid pipelining"); |
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111 |
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112 if (s->buffer == NULL) { |
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113 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) { |
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114 return; |
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115 } |
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116 } |
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117 |
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118 if (ngx_mail_smtp_discard_command(s, c, |
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119 "client was rejected before greeting: \"%V\"") |
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120 != NGX_OK) |
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121 { |
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122 return; |
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123 } |
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124 |
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125 s->out.len = sizeof(smtp_invalid_pipelining) - 1; |
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126 s->out.data = smtp_invalid_pipelining; |
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127 } |
539 | 128 |
1136 | 129 ngx_mail_send(c->write); |
539 | 130 } |
131 | |
132 | |
133 void | |
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134 ngx_mail_smtp_init_protocol(ngx_event_t *rev) |
539 | 135 { |
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136 ngx_connection_t *c; |
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137 ngx_mail_session_t *s; |
417
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diff
changeset
|
138 |
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139 c = rev->data; |
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140 |
541 | 141 c->log->action = "in auth state"; |
142 | |
423
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diff
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|
143 if (rev->timedout) { |
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144 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); |
577 | 145 c->timedout = 1; |
1136 | 146 ngx_mail_close_connection(c); |
423
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147 return; |
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148 } |
420
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149 |
539 | 150 s = c->data; |
521 | 151 |
1483
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152 if (s->buffer == NULL) { |
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153 if (ngx_mail_smtp_create_buffer(s, c) != NGX_OK) { |
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154 return; |
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|
155 } |
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|
156 } |
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157 |
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158 s->mail_state = ngx_smtp_start; |
1477 | 159 c->read->handler = ngx_mail_smtp_auth_state; |
1136 | 160 |
1477 | 161 ngx_mail_smtp_auth_state(rev); |
521 | 162 } |
163 | |
164 | |
1483
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165 static ngx_int_t |
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166 ngx_mail_smtp_create_buffer(ngx_mail_session_t *s, ngx_connection_t *c) |
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|
167 { |
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|
168 ngx_mail_core_srv_conf_t *cscf; |
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169 |
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170 if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) == NGX_ERROR) { |
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171 ngx_mail_session_internal_server_error(s); |
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172 return NGX_ERROR; |
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173 } |
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174 |
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175 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
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176 |
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177 s->buffer = ngx_create_temp_buf(c->pool, cscf->smtp_client_buffer_size); |
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178 if (s->buffer == NULL) { |
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179 ngx_mail_session_internal_server_error(s); |
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180 return NGX_ERROR; |
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181 } |
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182 |
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183 return NGX_OK; |
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184 } |
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185 |
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|
186 |
527 | 187 void |
1477 | 188 ngx_mail_smtp_auth_state(ngx_event_t *rev) |
420
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189 { |
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190 ngx_int_t rc; |
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191 ngx_connection_t *c; |
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192 ngx_mail_session_t *s; |
420
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193 |
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194 c = rev->data; |
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195 s = c->data; |
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196 |
1136 | 197 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp auth state"); |
421
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198 |
423
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199 if (rev->timedout) { |
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200 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); |
577 | 201 c->timedout = 1; |
1136 | 202 ngx_mail_close_connection(c); |
423
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203 return; |
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204 } |
420
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|
205 |
539 | 206 if (s->out.len) { |
1136 | 207 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp send handler busy"); |
539 | 208 s->blocked = 1; |
209 return; | |
210 } | |
211 | |
212 s->blocked = 0; | |
213 | |
1482 | 214 rc = ngx_mail_read_command(s, c); |
420
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215 |
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216 if (rc == NGX_AGAIN || rc == NGX_ERROR) { |
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217 return; |
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218 } |
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219 |
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220 s->out.len = sizeof(smtp_ok) - 1; |
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221 s->out.data = smtp_ok; |
421
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222 |
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223 if (rc == NGX_OK) { |
1136 | 224 switch (s->mail_state) { |
421
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225 |
1136 | 226 case ngx_smtp_start: |
421
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227 |
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228 switch (s->command) { |
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229 |
1136 | 230 case NGX_SMTP_HELO: |
231 case NGX_SMTP_EHLO: | |
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232 rc = ngx_mail_smtp_helo(s, c); |
809 | 233 break; |
234 | |
1136 | 235 case NGX_SMTP_AUTH: |
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236 rc = ngx_mail_smtp_auth(s, c); |
800 | 237 break; |
238 | |
1136 | 239 case NGX_SMTP_QUIT: |
539 | 240 s->quit = 1; |
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241 s->out.len = sizeof(smtp_bye) - 1; |
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242 s->out.data = smtp_bye; |
527 | 243 break; |
244 | |
1136 | 245 case NGX_SMTP_MAIL: |
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246 rc = ngx_mail_smtp_mail(s, c); |
583 | 247 break; |
248 | |
1136 | 249 case NGX_SMTP_NOOP: |
250 case NGX_SMTP_RSET: | |
421
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251 break; |
1322 | 252 |
253 case NGX_SMTP_STARTTLS: | |
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254 rc = ngx_mail_smtp_starttls(s, c); |
1322 | 255 break; |
256 | |
257 default: | |
258 rc = NGX_MAIL_PARSE_INVALID_COMMAND; | |
259 break; | |
421
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260 } |
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261 |
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262 break; |
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263 |
1136 | 264 case ngx_smtp_auth_login_username: |
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265 rc = ngx_mail_auth_login_username(s, c); |
809 | 266 |
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267 s->out.len = sizeof(smtp_password) - 1; |
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268 s->out.data = smtp_password; |
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269 s->mail_state = ngx_smtp_auth_login_password; |
809 | 270 break; |
271 | |
1136 | 272 case ngx_smtp_auth_login_password: |
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273 rc = ngx_mail_auth_login_password(s, c); |
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274 break; |
809 | 275 |
1136 | 276 case ngx_smtp_auth_plain: |
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277 rc = ngx_mail_auth_plain(s, c, 0); |
894
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278 break; |
809 | 279 |
1136 | 280 case ngx_smtp_auth_cram_md5: |
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281 rc = ngx_mail_auth_cram_md5(s, c); |
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282 break; |
421
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283 } |
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284 } |
420
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285 |
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286 switch (rc) { |
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287 |
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288 case NGX_DONE: |
1482 | 289 ngx_mail_auth(s, c); |
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290 return; |
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291 |
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292 case NGX_ERROR: |
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293 ngx_mail_session_internal_server_error(s); |
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294 return; |
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295 |
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296 case NGX_MAIL_PARSE_INVALID_COMMAND: |
1136 | 297 s->mail_state = ngx_smtp_start; |
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298 s->state = 0; |
420
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299 |
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300 s->out.len = sizeof(smtp_invalid_command) - 1; |
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301 s->out.data = smtp_invalid_command; |
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302 |
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303 /* fall through */ |
539 | 304 |
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305 case NGX_OK: |
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306 s->args.nelts = 0; |
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307 s->buffer->pos = s->buffer->start; |
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308 s->buffer->last = s->buffer->start; |
810 | 309 |
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310 if (s->state) { |
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311 s->arg_start = s->buffer->start; |
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312 } |
539 | 313 |
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314 ngx_mail_send(c->write); |
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315 } |
417
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316 } |
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317 |
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318 |
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319 static ngx_int_t |
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320 ngx_mail_smtp_helo(ngx_mail_session_t *s, ngx_connection_t *c) |
894
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321 { |
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322 ngx_str_t *arg; |
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323 ngx_mail_core_srv_conf_t *cscf; |
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324 #if (NGX_MAIL_SSL) |
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325 ngx_mail_ssl_conf_t *sslcf; |
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326 #endif |
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327 |
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328 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
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329 |
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330 if (s->args.nelts != 1) { |
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331 s->out.len = sizeof(smtp_invalid_argument) - 1; |
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332 s->out.data = smtp_invalid_argument; |
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333 s->state = 0; |
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334 return NGX_OK; |
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335 } |
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336 |
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337 arg = s->args.elts; |
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338 |
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339 s->smtp_helo.len = arg[0].len; |
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340 |
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341 s->smtp_helo.data = ngx_palloc(c->pool, arg[0].len); |
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342 if (s->smtp_helo.data == NULL) { |
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343 return NGX_ERROR; |
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344 } |
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345 |
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346 ngx_memcpy(s->smtp_helo.data, arg[0].data, arg[0].len); |
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347 |
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348 if (s->command == NGX_SMTP_HELO) { |
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349 s->out = cscf->smtp_server_name; |
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350 |
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351 } else { |
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352 s->esmtp = 1; |
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353 |
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354 #if (NGX_MAIL_SSL) |
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355 |
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356 if (c->ssl == NULL) { |
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357 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
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358 |
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359 if (sslcf->starttls == NGX_MAIL_STARTTLS_ON) { |
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360 s->out = cscf->smtp_starttls_capability; |
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361 return NGX_OK; |
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362 } |
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363 |
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364 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) { |
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365 s->out = cscf->smtp_starttls_only_capability; |
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366 return NGX_OK; |
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367 } |
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368 } |
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369 #endif |
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370 |
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371 s->out = cscf->smtp_capability; |
420
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372 } |
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373 |
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374 return NGX_OK; |
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375 } |
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376 |
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377 |
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378 static ngx_int_t |
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379 ngx_mail_smtp_auth(ngx_mail_session_t *s, ngx_connection_t *c) |
525 | 380 { |
1479 | 381 ngx_int_t rc; |
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382 ngx_mail_core_srv_conf_t *cscf; |
525 | 383 |
1479 | 384 #if (NGX_MAIL_SSL) |
385 if (ngx_mail_starttls_only(s, c)) { | |
386 return NGX_MAIL_PARSE_INVALID_COMMAND; | |
539 | 387 } |
388 #endif | |
389 | |
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390 if (s->args.nelts == 0) { |
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391 s->out.len = sizeof(smtp_invalid_argument) - 1; |
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392 s->out.data = smtp_invalid_argument; |
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393 s->state = 0; |
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394 return NGX_OK; |
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395 } |
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396 |
1479 | 397 rc = ngx_mail_auth_parse(s, c); |
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398 |
1479 | 399 switch (rc) { |
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400 |
1479 | 401 case NGX_MAIL_AUTH_LOGIN: |
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402 |
1479 | 403 s->out.len = sizeof(smtp_username) - 1; |
404 s->out.data = smtp_username; | |
405 s->mail_state = ngx_smtp_auth_login_username; | |
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406 |
1479 | 407 return NGX_OK; |
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408 |
1479 | 409 case NGX_MAIL_AUTH_PLAIN: |
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410 |
1479 | 411 s->out.len = sizeof(smtp_next) - 1; |
412 s->out.data = smtp_next; | |
413 s->mail_state = ngx_smtp_auth_plain; | |
543 | 414 |
1479 | 415 return NGX_OK; |
416 | |
417 case NGX_MAIL_AUTH_CRAM_MD5: | |
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418 |
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419 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module); |
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420 |
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421 if (!(cscf->smtp_auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED)) { |
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422 return NGX_MAIL_PARSE_INVALID_COMMAND; |
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423 } |
479 | 424 |
1479 | 425 if (ngx_mail_auth_cram_md5_salt(s, c, "334 ", 4) == NGX_OK) { |
426 s->mail_state = ngx_smtp_auth_cram_md5; | |
427 return NGX_OK; | |
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428 } |
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429 |
1479 | 430 return NGX_ERROR; |
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431 } |
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432 |
1479 | 433 return rc; |
417
0526206251f6
nginx-0.0.10-2004-09-07-19:29:22 import
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diff
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|
434 } |
539 | 435 |
436 | |
1476
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437 static ngx_int_t |
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438 ngx_mail_smtp_mail(ngx_mail_session_t *s, ngx_connection_t *c) |
541 | 439 { |
1481
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440 ngx_mail_smtp_log_rejected_command(s, c, "client was rejected: \"%V\""); |
577 | 441 |
1476
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442 s->out.len = sizeof(smtp_auth_required) - 1; |
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|
443 s->out.data = smtp_auth_required; |
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|
444 |
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445 return NGX_OK; |
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|
446 } |
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|
447 |
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|
448 |
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449 static ngx_int_t |
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|
450 ngx_mail_smtp_starttls(ngx_mail_session_t *s, ngx_connection_t *c) |
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|
451 { |
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|
452 #if (NGX_MAIL_SSL) |
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changeset
|
453 ngx_mail_ssl_conf_t *sslcf; |
541 | 454 |
1476
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changeset
|
455 if (c->ssl == NULL) { |
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|
456 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module); |
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diff
changeset
|
457 if (sslcf->starttls) { |
541 | 458 |
1476
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|
459 /* |
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|
460 * RFC3207 requires us to discard any knowledge |
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|
461 * obtained from client before STARTTLS. |
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|
462 */ |
541 | 463 |
1476
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|
464 s->smtp_helo.len = 0; |
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|
465 s->smtp_helo.data = NULL; |
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|
466 |
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467 c->read->handler = ngx_mail_starttls_handler; |
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468 return NGX_OK; |
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|
469 } |
541 | 470 } |
471 | |
1476
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472 #endif |
541 | 473 |
1476
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474 return NGX_MAIL_PARSE_INVALID_COMMAND; |
541 | 475 } |
1481
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|
476 |
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diff
changeset
|
477 |
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|
478 static ngx_int_t |
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479 ngx_mail_smtp_discard_command(ngx_mail_session_t *s, ngx_connection_t *c, |
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|
480 char *err) |
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481 { |
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482 ssize_t n; |
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|
483 |
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484 n = c->recv(c, s->buffer->last, s->buffer->end - s->buffer->last); |
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|
485 |
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|
486 if (n == NGX_ERROR || n == 0) { |
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487 ngx_mail_close_connection(c); |
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488 return NGX_ERROR; |
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|
489 } |
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|
490 |
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|
491 if (n > 0) { |
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492 s->buffer->last += n; |
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|
493 } |
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|
494 |
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|
495 if (n == NGX_AGAIN) { |
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496 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) { |
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|
497 ngx_mail_session_internal_server_error(s); |
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498 return NGX_ERROR; |
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|
499 } |
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|
500 |
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501 return NGX_AGAIN; |
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|
502 } |
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|
503 |
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|
504 ngx_mail_smtp_log_rejected_command(s, c, err); |
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|
505 |
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|
506 s->buffer->pos = s->buffer->start; |
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|
507 s->buffer->last = s->buffer->start; |
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|
508 |
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|
509 return NGX_OK; |
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510 } |
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|
511 |
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|
512 |
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|
513 static void |
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514 ngx_mail_smtp_log_rejected_command(ngx_mail_session_t *s, ngx_connection_t *c, |
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515 char *err) |
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|
516 { |
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517 u_char ch; |
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|
518 ngx_str_t cmd; |
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changeset
|
519 ngx_uint_t i; |
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|
520 |
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521 if (c->log->log_level < NGX_LOG_INFO) { |
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522 return; |
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|
523 } |
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|
524 |
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changeset
|
525 cmd.len = s->buffer->last - s->buffer->start; |
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|
526 cmd.data = s->buffer->start; |
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|
527 |
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|
528 for (i = 0; i < cmd.len; i++) { |
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|
529 ch = cmd.data[i]; |
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|
530 |
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|
531 if (ch != CR && ch != LF) { |
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|
532 continue; |
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changeset
|
533 } |
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|
534 |
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changeset
|
535 cmd.data[i] = ' '; |
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diff
changeset
|
536 } |
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diff
changeset
|
537 |
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changeset
|
538 while (i) { |
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diff
changeset
|
539 if (cmd.data[i - 1] != ' ') { |
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changeset
|
540 break; |
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diff
changeset
|
541 } |
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smtp_client_buffer and smtp_greeting_delay
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1480
diff
changeset
|
542 |
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diff
changeset
|
543 i--; |
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changeset
|
544 } |
b58ce1cf66da
smtp_client_buffer and smtp_greeting_delay
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changeset
|
545 |
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changeset
|
546 cmd.len = i; |
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smtp_client_buffer and smtp_greeting_delay
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|
547 |
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diff
changeset
|
548 ngx_log_error(NGX_LOG_INFO, c->log, 0, err, &cmd); |
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smtp_client_buffer and smtp_greeting_delay
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changeset
|
549 } |