290
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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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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>
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10 #include <ngx_mail.h>
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11
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12
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13 static void ngx_mail_init_session(ngx_connection_t *c);
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14
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15 #if (NGX_MAIL_SSL)
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16 static void ngx_mail_ssl_init_connection(ngx_ssl_t *ssl, ngx_connection_t *c);
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17 static void ngx_mail_ssl_handshake_handler(ngx_connection_t *c);
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18 #endif
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19
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20
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21 void
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22 ngx_mail_init_connection(ngx_connection_t *c)
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23 {
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24 in_addr_t in_addr;
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25 socklen_t len;
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26 ngx_uint_t i;
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27 struct sockaddr_in sin;
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28 ngx_mail_log_ctx_t *ctx;
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29 ngx_mail_in_port_t *imip;
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30 ngx_mail_in_addr_t *imia;
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31 ngx_mail_session_t *s;
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32
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33 /* find the server configuration for the address:port */
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34
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35 /* AF_INET only */
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36
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37 imip = c->listening->servers;
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38 imia = imip->addrs;
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39
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40 i = 0;
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41
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42 if (imip->naddrs > 1) {
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43
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44 /*
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45 * There are several addresses on this port and one of them
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46 * is the "*:port" wildcard so getsockname() is needed to determine
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47 * the server address.
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48 *
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49 * AcceptEx() already gave this address.
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50 */
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51
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52 #if (NGX_WIN32)
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53 if (c->local_sockaddr) {
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54 in_addr =
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55 ((struct sockaddr_in *) c->local_sockaddr)->sin_addr.s_addr;
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56
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57 } else
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58 #endif
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59 {
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60 len = sizeof(struct sockaddr_in);
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61 if (getsockname(c->fd, (struct sockaddr *) &sin, &len) == -1) {
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62 ngx_connection_error(c, ngx_socket_errno,
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63 "getsockname() failed");
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64 ngx_mail_close_connection(c);
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65 return;
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66 }
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67
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68 in_addr = sin.sin_addr.s_addr;
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69 }
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70
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71 /* the last address is "*" */
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72
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73 for ( /* void */ ; i < imip->naddrs - 1; i++) {
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74 if (in_addr == imia[i].addr) {
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75 break;
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76 }
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77 }
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78 }
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79
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80
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81 s = ngx_pcalloc(c->pool, sizeof(ngx_mail_session_t));
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82 if (s == NULL) {
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83 ngx_mail_close_connection(c);
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84 return;
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85 }
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86
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87 s->main_conf = imia[i].ctx->main_conf;
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88 s->srv_conf = imia[i].ctx->srv_conf;
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89
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90 s->addr_text = &imia[i].addr_text;
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91
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92 c->data = s;
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93 s->connection = c;
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94
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95 ngx_log_error(NGX_LOG_INFO, c->log, 0, "*%ui client %V connected to %V",
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96 c->number, &c->addr_text, s->addr_text);
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97
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98 ctx = ngx_palloc(c->pool, sizeof(ngx_mail_log_ctx_t));
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99 if (ctx == NULL) {
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100 ngx_mail_close_connection(c);
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101 return;
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102 }
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103
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104 ctx->client = &c->addr_text;
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105 ctx->session = s;
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106
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107 c->log->connection = c->number;
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108 c->log->handler = ngx_mail_log_error;
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109 c->log->data = ctx;
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110 c->log->action = "sending client greeting line";
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111
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112 c->log_error = NGX_ERROR_INFO;
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113
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114 #if (NGX_MAIL_SSL)
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356
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115 {
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116 ngx_mail_ssl_conf_t *sslcf;
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290
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117
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118 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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119
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120 if (sslcf->enable) {
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121 c->log->action = "SSL handshaking";
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122
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290
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123 ngx_mail_ssl_init_connection(&sslcf->ssl, c);
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124 return;
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125 }
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404
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126
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127 if (imia[i].ssl) {
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128
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129 c->log->action = "SSL handshaking";
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130
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131 if (sslcf->ssl.ctx == NULL) {
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132 ngx_log_error(NGX_LOG_ERR, c->log, 0,
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133 "no \"ssl_certificate\" is defined "
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134 "in server listening on SSL port");
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135 ngx_mail_close_connection(c);
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136 return;
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137 }
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138
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139 ngx_mail_ssl_init_connection(&sslcf->ssl, c);
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140 return;
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141 }
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142
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356
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143 }
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290
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144 #endif
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145
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146 ngx_mail_init_session(c);
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147 }
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148
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149
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150 #if (NGX_MAIL_SSL)
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151
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336
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152 void
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290
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153 ngx_mail_starttls_handler(ngx_event_t *rev)
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154 {
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155 ngx_connection_t *c;
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156 ngx_mail_session_t *s;
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157 ngx_mail_ssl_conf_t *sslcf;
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158
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159 c = rev->data;
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160 s = c->data;
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161 s->starttls = 1;
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162
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163 c->log->action = "in starttls state";
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164
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165 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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166
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167 ngx_mail_ssl_init_connection(&sslcf->ssl, c);
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168 }
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169
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170
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171 static void
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172 ngx_mail_ssl_init_connection(ngx_ssl_t *ssl, ngx_connection_t *c)
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173 {
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174 ngx_mail_session_t *s;
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175 ngx_mail_core_srv_conf_t *cscf;
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176
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177 if (ngx_ssl_create_connection(ssl, c, 0) == NGX_ERROR) {
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178 ngx_mail_close_connection(c);
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179 return;
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180 }
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181
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182 if (ngx_ssl_handshake(c) == NGX_AGAIN) {
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183
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184 s = c->data;
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185
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186 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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187
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188 ngx_add_timer(c->read, cscf->timeout);
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189
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190 c->ssl->handler = ngx_mail_ssl_handshake_handler;
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191
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192 return;
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193 }
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194
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195 ngx_mail_ssl_handshake_handler(c);
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196 }
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197
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198
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199 static void
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200 ngx_mail_ssl_handshake_handler(ngx_connection_t *c)
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201 {
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336
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202 ngx_mail_session_t *s;
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203 ngx_mail_core_srv_conf_t *cscf;
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290
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204
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205 if (c->ssl->handshaked) {
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206
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207 s = c->data;
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208
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209 if (s->starttls) {
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210 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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211
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212 c->read->handler = cscf->protocol->init_protocol;
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290
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213 c->write->handler = ngx_mail_send;
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214
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336
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215 cscf->protocol->init_protocol(c->read);
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290
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216
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217 return;
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218 }
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219
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394
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220 c->read->ready = 0;
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221
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290
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222 ngx_mail_init_session(c);
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223 return;
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224 }
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225
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226 ngx_mail_close_connection(c);
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227 }
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228
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229 #endif
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230
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231
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232 static void
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233 ngx_mail_init_session(ngx_connection_t *c)
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234 {
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235 ngx_mail_session_t *s;
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236 ngx_mail_core_srv_conf_t *cscf;
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237
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238 s = c->data;
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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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336
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242 s->protocol = cscf->protocol->type;
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243
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244 s->ctx = ngx_pcalloc(c->pool, sizeof(void *) * ngx_mail_max_module);
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245 if (s->ctx == NULL) {
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246 ngx_mail_session_internal_server_error(s);
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247 return;
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248 }
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249
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336
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250 c->write->handler = ngx_mail_send;
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251
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252 cscf->protocol->init_session(s, c);
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253 }
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254
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255
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256 ngx_int_t
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257 ngx_mail_salt(ngx_mail_session_t *s, ngx_connection_t *c,
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258 ngx_mail_core_srv_conf_t *cscf)
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259 {
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382
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260 s->salt.data = ngx_pnalloc(c->pool,
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261 sizeof(" <18446744073709551616.@>" CRLF) - 1
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262 + NGX_TIME_T_LEN
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263 + cscf->server_name.len);
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336
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264 if (s->salt.data == NULL) {
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265 return NGX_ERROR;
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266 }
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267
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268 s->salt.len = ngx_sprintf(s->salt.data, "<%ul.%T@%V>" CRLF,
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269 ngx_random(), ngx_time(), &cscf->server_name)
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270 - s->salt.data;
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271
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272 return NGX_OK;
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273 }
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274
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275
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276 #if (NGX_MAIL_SSL)
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277
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278 ngx_int_t
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279 ngx_mail_starttls_only(ngx_mail_session_t *s, ngx_connection_t *c)
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280 {
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281 ngx_mail_ssl_conf_t *sslcf;
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282
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283 if (c->ssl) {
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284 return 0;
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285 }
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286
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287 sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
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288
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289 if (sslcf->starttls == NGX_MAIL_STARTTLS_ONLY) {
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290 return 1;
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291 }
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292
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293 return 0;
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294 }
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290
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295
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336
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296 #endif
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297
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298
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299 ngx_int_t
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300 ngx_mail_auth_plain(ngx_mail_session_t *s, ngx_connection_t *c, ngx_uint_t n)
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301 {
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302 u_char *p, *last;
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303 ngx_str_t *arg, plain;
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304
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305 arg = s->args.elts;
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306
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307 #if (NGX_DEBUG_MAIL_PASSWD)
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308 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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309 "mail auth plain: \"%V\"", &arg[n]);
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310 #endif
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311
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382
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312 plain.data = ngx_pnalloc(c->pool, ngx_base64_decoded_length(arg[n].len));
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336
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313 if (plain.data == NULL){
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314 return NGX_ERROR;
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315 }
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316
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317 if (ngx_decode_base64(&plain, &arg[n]) != NGX_OK) {
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318 ngx_log_error(NGX_LOG_INFO, c->log, 0,
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319 "client sent invalid base64 encoding in AUTH PLAIN command");
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320 return NGX_MAIL_PARSE_INVALID_COMMAND;
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321 }
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322
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323 p = plain.data;
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324 last = p + plain.len;
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325
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326 while (p < last && *p++) { /* void */ }
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327
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328 if (p == last) {
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329 ngx_log_error(NGX_LOG_INFO, c->log, 0,
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330 "client sent invalid login in AUTH PLAIN command");
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331 return NGX_MAIL_PARSE_INVALID_COMMAND;
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332 }
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333
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334 s->login.data = p;
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335
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336 while (p < last && *p) { p++; }
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337
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338 if (p == last) {
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339 ngx_log_error(NGX_LOG_INFO, c->log, 0,
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340 "client sent invalid password in AUTH PLAIN command");
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341 return NGX_MAIL_PARSE_INVALID_COMMAND;
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290
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342 }
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343
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336
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344 s->login.len = p++ - s->login.data;
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345
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346 s->passwd.len = last - p;
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347 s->passwd.data = p;
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348
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349 #if (NGX_DEBUG_MAIL_PASSWD)
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350 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
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351 "mail auth plain: \"%V\" \"%V\"", &s->login, &s->passwd);
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352 #endif
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353
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354 return NGX_DONE;
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355 }
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356
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290
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357
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336
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358 ngx_int_t
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359 ngx_mail_auth_login_username(ngx_mail_session_t *s, ngx_connection_t *c)
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360 {
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361 ngx_str_t *arg;
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362
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363 arg = s->args.elts;
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364
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365 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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366 "mail auth login username: \"%V\"", &arg[0]);
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367
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382
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368 s->login.data = ngx_pnalloc(c->pool, ngx_base64_decoded_length(arg[0].len));
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336
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369 if (s->login.data == NULL){
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370 return NGX_ERROR;
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371 }
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322
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372
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336
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373 if (ngx_decode_base64(&s->login, &arg[0]) != NGX_OK) {
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374 ngx_log_error(NGX_LOG_INFO, c->log, 0,
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375 "client sent invalid base64 encoding in AUTH LOGIN command");
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376 return NGX_MAIL_PARSE_INVALID_COMMAND;
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377 }
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378
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379 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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380 "mail auth login username: \"%V\"", &s->login);
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381
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382 return NGX_OK;
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383 }
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384
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385
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386 ngx_int_t
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387 ngx_mail_auth_login_password(ngx_mail_session_t *s, ngx_connection_t *c)
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388 {
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389 ngx_str_t *arg;
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390
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391 arg = s->args.elts;
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392
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393 #if (NGX_DEBUG_MAIL_PASSWD)
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394 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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395 "mail auth login password: \"%V\"", &arg[0]);
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396 #endif
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397
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382
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398 s->passwd.data = ngx_pnalloc(c->pool,
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399 ngx_base64_decoded_length(arg[0].len));
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336
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400 if (s->passwd.data == NULL){
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401 return NGX_ERROR;
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402 }
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403
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404 if (ngx_decode_base64(&s->passwd, &arg[0]) != NGX_OK) {
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405 ngx_log_error(NGX_LOG_INFO, c->log, 0,
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406 "client sent invalid base64 encoding in AUTH LOGIN command");
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407 return NGX_MAIL_PARSE_INVALID_COMMAND;
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408 }
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290
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409
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336
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410 #if (NGX_DEBUG_MAIL_PASSWD)
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411 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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412 "mail auth login password: \"%V\"", &s->passwd);
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413 #endif
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414
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415 return NGX_DONE;
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416 }
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417
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418
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419 ngx_int_t
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420 ngx_mail_auth_cram_md5_salt(ngx_mail_session_t *s, ngx_connection_t *c,
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421 char *prefix, size_t len)
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422 {
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423 u_char *p;
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424 ngx_str_t salt;
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425 ngx_uint_t n;
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426
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382
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427 p = ngx_pnalloc(c->pool, len + ngx_base64_encoded_length(s->salt.len) + 2);
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336
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428 if (p == NULL) {
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429 return NGX_ERROR;
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430 }
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431
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432 salt.data = ngx_cpymem(p, prefix, len);
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433 s->salt.len -= 2;
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434
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435 ngx_encode_base64(&salt, &s->salt);
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436
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437 s->salt.len += 2;
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438 n = len + salt.len;
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439 p[n++] = CR; p[n++] = LF;
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440
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441 s->out.len = n;
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442 s->out.data = p;
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290
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443
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336
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444 return NGX_OK;
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445 }
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446
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447
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448 ngx_int_t
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449 ngx_mail_auth_cram_md5(ngx_mail_session_t *s, ngx_connection_t *c)
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450 {
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451 u_char *p, *last;
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452 ngx_str_t *arg;
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453
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454 arg = s->args.elts;
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455
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456 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
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457 "mail auth cram-md5: \"%V\"", &arg[0]);
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290
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458
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382
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459 s->login.data = ngx_pnalloc(c->pool, ngx_base64_decoded_length(arg[0].len));
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336
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460 if (s->login.data == NULL){
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461 return NGX_ERROR;
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462 }
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290
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463
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336
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464 if (ngx_decode_base64(&s->login, &arg[0]) != NGX_OK) {
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465 ngx_log_error(NGX_LOG_INFO, c->log, 0,
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466 "client sent invalid base64 encoding in AUTH CRAM-MD5 command");
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467 return NGX_MAIL_PARSE_INVALID_COMMAND;
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468 }
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469
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470 p = s->login.data;
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471 last = p + s->login.len;
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472
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473 while (p < last) {
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474 if (*p++ == ' ') {
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475 s->login.len = p - s->login.data - 1;
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476 s->passwd.len = last - p;
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477 s->passwd.data = p;
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478 break;
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290
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479 }
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480 }
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481
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336
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482 if (s->passwd.len != 32) {
|
|
483 ngx_log_error(NGX_LOG_INFO, c->log, 0,
|
|
484 "client sent invalid CRAM-MD5 hash in AUTH CRAM-MD5 command");
|
|
485 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
290
|
486 }
|
|
487
|
336
|
488 ngx_log_debug2(NGX_LOG_DEBUG_MAIL, c->log, 0,
|
|
489 "mail auth cram-md5: \"%V\" \"%V\"", &s->login, &s->passwd);
|
|
490
|
|
491 s->auth_method = NGX_MAIL_AUTH_CRAM_MD5;
|
|
492
|
|
493 return NGX_DONE;
|
290
|
494 }
|
|
495
|
|
496
|
|
497 void
|
|
498 ngx_mail_send(ngx_event_t *wev)
|
|
499 {
|
|
500 ngx_int_t n;
|
|
501 ngx_connection_t *c;
|
|
502 ngx_mail_session_t *s;
|
|
503 ngx_mail_core_srv_conf_t *cscf;
|
|
504
|
|
505 c = wev->data;
|
|
506 s = c->data;
|
|
507
|
|
508 if (wev->timedout) {
|
|
509 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
|
|
510 c->timedout = 1;
|
|
511 ngx_mail_close_connection(c);
|
|
512 return;
|
|
513 }
|
|
514
|
|
515 if (s->out.len == 0) {
|
|
516 if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
|
|
517 ngx_mail_close_connection(c);
|
|
518 }
|
|
519
|
|
520 return;
|
|
521 }
|
|
522
|
|
523 n = c->send(c, s->out.data, s->out.len);
|
|
524
|
|
525 if (n > 0) {
|
|
526 s->out.len -= n;
|
|
527
|
|
528 if (wev->timer_set) {
|
|
529 ngx_del_timer(wev);
|
|
530 }
|
|
531
|
|
532 if (s->quit) {
|
|
533 ngx_mail_close_connection(c);
|
|
534 return;
|
|
535 }
|
|
536
|
|
537 if (s->blocked) {
|
|
538 c->read->handler(c->read);
|
|
539 }
|
|
540
|
|
541 return;
|
|
542 }
|
|
543
|
|
544 if (n == NGX_ERROR) {
|
|
545 ngx_mail_close_connection(c);
|
|
546 return;
|
|
547 }
|
|
548
|
|
549 /* n == NGX_AGAIN */
|
|
550
|
|
551 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
552
|
|
553 ngx_add_timer(c->write, cscf->timeout);
|
|
554
|
|
555 if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
|
|
556 ngx_mail_close_connection(c);
|
|
557 return;
|
|
558 }
|
|
559 }
|
|
560
|
|
561
|
336
|
562 ngx_int_t
|
|
563 ngx_mail_read_command(ngx_mail_session_t *s, ngx_connection_t *c)
|
290
|
564 {
|
336
|
565 ssize_t n;
|
|
566 ngx_int_t rc;
|
|
567 ngx_str_t l;
|
290
|
568 ngx_mail_core_srv_conf_t *cscf;
|
|
569
|
336
|
570 n = c->recv(c, s->buffer->last, s->buffer->end - s->buffer->last);
|
290
|
571
|
|
572 if (n == NGX_ERROR || n == 0) {
|
336
|
573 ngx_mail_close_connection(c);
|
290
|
574 return NGX_ERROR;
|
|
575 }
|
|
576
|
|
577 if (n > 0) {
|
|
578 s->buffer->last += n;
|
|
579 }
|
|
580
|
|
581 if (n == NGX_AGAIN) {
|
336
|
582 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
|
290
|
583 ngx_mail_session_internal_server_error(s);
|
|
584 return NGX_ERROR;
|
|
585 }
|
|
586
|
|
587 return NGX_AGAIN;
|
|
588 }
|
|
589
|
336
|
590 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
290
|
591
|
336
|
592 rc = cscf->protocol->parse_command(s);
|
290
|
593
|
|
594 if (rc == NGX_AGAIN) {
|
|
595
|
|
596 if (s->buffer->last < s->buffer->end) {
|
|
597 return rc;
|
|
598 }
|
|
599
|
|
600 l.len = s->buffer->last - s->buffer->start;
|
|
601 l.data = s->buffer->start;
|
|
602
|
336
|
603 ngx_log_error(NGX_LOG_INFO, c->log, 0,
|
290
|
604 "client sent too long command \"%V\"", &l);
|
|
605
|
|
606 s->quit = 1;
|
|
607
|
|
608 return NGX_MAIL_PARSE_INVALID_COMMAND;
|
|
609 }
|
|
610
|
|
611 if (rc == NGX_IMAP_NEXT || rc == NGX_MAIL_PARSE_INVALID_COMMAND) {
|
|
612 return rc;
|
|
613 }
|
|
614
|
|
615 if (rc == NGX_ERROR) {
|
336
|
616 ngx_mail_close_connection(c);
|
290
|
617 return NGX_ERROR;
|
|
618 }
|
|
619
|
|
620 return NGX_OK;
|
|
621 }
|
|
622
|
|
623
|
|
624 void
|
336
|
625 ngx_mail_auth(ngx_mail_session_t *s, ngx_connection_t *c)
|
|
626 {
|
|
627 s->args.nelts = 0;
|
|
628 s->buffer->pos = s->buffer->start;
|
|
629 s->buffer->last = s->buffer->start;
|
|
630 s->state = 0;
|
|
631
|
|
632 if (c->read->timer_set) {
|
|
633 ngx_del_timer(c->read);
|
|
634 }
|
|
635
|
|
636 s->login_attempt++;
|
|
637
|
|
638 ngx_mail_auth_http_init(s);
|
|
639 }
|
|
640
|
|
641
|
|
642 void
|
290
|
643 ngx_mail_session_internal_server_error(ngx_mail_session_t *s)
|
|
644 {
|
336
|
645 ngx_mail_core_srv_conf_t *cscf;
|
|
646
|
|
647 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
648
|
|
649 s->out = cscf->protocol->internal_server_error;
|
290
|
650 s->quit = 1;
|
|
651
|
|
652 ngx_mail_send(s->connection->write);
|
|
653 }
|
|
654
|
|
655
|
|
656 void
|
|
657 ngx_mail_close_connection(ngx_connection_t *c)
|
|
658 {
|
|
659 ngx_pool_t *pool;
|
|
660
|
|
661 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, c->log, 0,
|
|
662 "close mail connection: %d", c->fd);
|
|
663
|
|
664 #if (NGX_MAIL_SSL)
|
|
665
|
|
666 if (c->ssl) {
|
|
667 if (ngx_ssl_shutdown(c) == NGX_AGAIN) {
|
|
668 c->ssl->handler = ngx_mail_close_connection;
|
|
669 return;
|
|
670 }
|
|
671 }
|
|
672
|
|
673 #endif
|
|
674
|
336
|
675 #if (NGX_STAT_STUB)
|
|
676 ngx_atomic_fetch_add(ngx_stat_active, -1);
|
|
677 #endif
|
|
678
|
290
|
679 c->destroyed = 1;
|
|
680
|
|
681 pool = c->pool;
|
|
682
|
|
683 ngx_close_connection(c);
|
|
684
|
|
685 ngx_destroy_pool(pool);
|
|
686 }
|
|
687
|
|
688
|
336
|
689 u_char *
|
290
|
690 ngx_mail_log_error(ngx_log_t *log, u_char *buf, size_t len)
|
|
691 {
|
|
692 u_char *p;
|
|
693 ngx_mail_session_t *s;
|
|
694 ngx_mail_log_ctx_t *ctx;
|
|
695
|
|
696 if (log->action) {
|
|
697 p = ngx_snprintf(buf, len, " while %s", log->action);
|
|
698 len -= p - buf;
|
|
699 buf = p;
|
|
700 }
|
|
701
|
|
702 ctx = log->data;
|
|
703
|
|
704 p = ngx_snprintf(buf, len, ", client: %V", ctx->client);
|
|
705 len -= p - buf;
|
|
706 buf = p;
|
|
707
|
|
708 s = ctx->session;
|
|
709
|
|
710 if (s == NULL) {
|
|
711 return p;
|
|
712 }
|
|
713
|
336
|
714 p = ngx_snprintf(buf, len, "%s, server: %V",
|
|
715 s->starttls ? " using starttls" : "",
|
|
716 s->addr_text);
|
290
|
717 len -= p - buf;
|
|
718 buf = p;
|
|
719
|
|
720 if (s->login.len == 0) {
|
|
721 return p;
|
|
722 }
|
|
723
|
|
724 p = ngx_snprintf(buf, len, ", login: \"%V\"", &s->login);
|
|
725 len -= p - buf;
|
|
726 buf = p;
|
|
727
|
|
728 if (s->proxy == NULL) {
|
|
729 return p;
|
|
730 }
|
|
731
|
|
732 p = ngx_snprintf(buf, len, ", upstream: %V", s->proxy->upstream.name);
|
|
733
|
|
734 return p;
|
|
735 }
|