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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_event_connect.h>
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11 #include <ngx_mail.h>
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12
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13
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14 typedef struct {
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15 ngx_flag_t enable;
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16 ngx_flag_t pass_error_message;
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17 ngx_flag_t xclient;
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18 size_t buffer_size;
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19 ngx_msec_t timeout;
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20 } ngx_mail_proxy_conf_t;
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21
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22
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23 static void ngx_mail_proxy_block_read(ngx_event_t *rev);
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24 static void ngx_mail_proxy_pop3_handler(ngx_event_t *rev);
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25 static void ngx_mail_proxy_imap_handler(ngx_event_t *rev);
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26 static void ngx_mail_proxy_smtp_handler(ngx_event_t *rev);
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27 static void ngx_mail_proxy_dummy_handler(ngx_event_t *ev);
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28 static ngx_int_t ngx_mail_proxy_read_response(ngx_mail_session_t *s,
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29 ngx_uint_t state);
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30 static void ngx_mail_proxy_handler(ngx_event_t *ev);
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31 static void ngx_mail_proxy_upstream_error(ngx_mail_session_t *s);
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32 static void ngx_mail_proxy_internal_server_error(ngx_mail_session_t *s);
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33 static void ngx_mail_proxy_close_session(ngx_mail_session_t *s);
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34 static void *ngx_mail_proxy_create_conf(ngx_conf_t *cf);
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35 static char *ngx_mail_proxy_merge_conf(ngx_conf_t *cf, void *parent,
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36 void *child);
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37
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38
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39 static ngx_command_t ngx_mail_proxy_commands[] = {
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40
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41 { ngx_string("proxy"),
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42 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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43 ngx_conf_set_flag_slot,
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44 NGX_MAIL_SRV_CONF_OFFSET,
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45 offsetof(ngx_mail_proxy_conf_t, enable),
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46 NULL },
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47
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48 { ngx_string("proxy_buffer"),
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49 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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50 ngx_conf_set_size_slot,
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51 NGX_MAIL_SRV_CONF_OFFSET,
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52 offsetof(ngx_mail_proxy_conf_t, buffer_size),
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53 NULL },
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54
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55 { ngx_string("proxy_timeout"),
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56 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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57 ngx_conf_set_msec_slot,
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58 NGX_MAIL_SRV_CONF_OFFSET,
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59 offsetof(ngx_mail_proxy_conf_t, timeout),
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60 NULL },
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61
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62 { ngx_string("proxy_pass_error_message"),
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63 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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64 ngx_conf_set_flag_slot,
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65 NGX_MAIL_SRV_CONF_OFFSET,
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66 offsetof(ngx_mail_proxy_conf_t, pass_error_message),
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67 NULL },
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68
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69 { ngx_string("xclient"),
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70 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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71 ngx_conf_set_flag_slot,
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72 NGX_MAIL_SRV_CONF_OFFSET,
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73 offsetof(ngx_mail_proxy_conf_t, xclient),
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74 NULL },
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75
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76 ngx_null_command
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77 };
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78
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79
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80 static ngx_mail_module_t ngx_mail_proxy_module_ctx = {
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81 NULL, /* create main configuration */
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82 NULL, /* init main configuration */
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83
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84 ngx_mail_proxy_create_conf, /* create server configuration */
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85 ngx_mail_proxy_merge_conf /* merge server configuration */
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86 };
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87
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88
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89 ngx_module_t ngx_mail_proxy_module = {
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90 NGX_MODULE_V1,
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91 &ngx_mail_proxy_module_ctx, /* module context */
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92 ngx_mail_proxy_commands, /* module directives */
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93 NGX_MAIL_MODULE, /* module type */
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94 NULL, /* init master */
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95 NULL, /* init module */
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96 NULL, /* init process */
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97 NULL, /* init thread */
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98 NULL, /* exit thread */
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99 NULL, /* exit process */
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100 NULL, /* exit master */
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101 NGX_MODULE_V1_PADDING
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102 };
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103
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104
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105 static u_char smtp_ok[] = "235 2.0.0 OK" CRLF;
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106
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107
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108 void
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109 ngx_mail_proxy_init(ngx_mail_session_t *s, ngx_peer_addr_t *peer)
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110 {
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111 int keepalive;
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112 ngx_int_t rc;
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113 ngx_mail_proxy_ctx_t *p;
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114 ngx_mail_proxy_conf_t *pcf;
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115 ngx_mail_core_srv_conf_t *cscf;
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116
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117 s->connection->log->action = "connecting to upstream";
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118
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119 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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120
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121 if (cscf->so_keepalive) {
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122 keepalive = 1;
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123
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124 if (setsockopt(s->connection->fd, SOL_SOCKET, SO_KEEPALIVE,
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125 (const void *) &keepalive, sizeof(int))
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126 == -1)
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127 {
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128 ngx_log_error(NGX_LOG_ALERT, s->connection->log, ngx_socket_errno,
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129 "setsockopt(SO_KEEPALIVE) failed");
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130 }
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131 }
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132
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133 p = ngx_pcalloc(s->connection->pool, sizeof(ngx_mail_proxy_ctx_t));
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134 if (p == NULL) {
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135 ngx_mail_session_internal_server_error(s);
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136 return;
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137 }
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138
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139 s->proxy = p;
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140
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141 p->upstream.sockaddr = peer->sockaddr;
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142 p->upstream.socklen = peer->socklen;
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143 p->upstream.name = &peer->name;
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144 p->upstream.get = ngx_event_get_peer;
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145 p->upstream.log = s->connection->log;
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146 p->upstream.log_error = NGX_ERROR_ERR;
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147
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148 rc = ngx_event_connect_peer(&p->upstream);
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149
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150 if (rc == NGX_ERROR || rc == NGX_BUSY || rc == NGX_DECLINED) {
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151 ngx_mail_proxy_internal_server_error(s);
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152 return;
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153 }
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154
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155 ngx_add_timer(p->upstream.connection->read, cscf->timeout);
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156
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157 p->upstream.connection->data = s;
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158 p->upstream.connection->pool = s->connection->pool;
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159
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160 s->connection->read->handler = ngx_mail_proxy_block_read;
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161 p->upstream.connection->write->handler = ngx_mail_proxy_dummy_handler;
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162
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163 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
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164
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165 s->proxy->buffer = ngx_create_temp_buf(s->connection->pool,
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166 pcf->buffer_size);
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167 if (s->proxy->buffer == NULL) {
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168 ngx_mail_proxy_internal_server_error(s);
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169 return;
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170 }
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171
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172 switch (s->protocol) {
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173
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174 case NGX_MAIL_POP3_PROTOCOL:
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175 p->upstream.connection->read->handler = ngx_mail_proxy_pop3_handler;
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176 s->mail_state = ngx_pop3_start;
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177 break;
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178
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179 case NGX_MAIL_IMAP_PROTOCOL:
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180 p->upstream.connection->read->handler = ngx_mail_proxy_imap_handler;
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181 s->mail_state = ngx_imap_start;
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182 break;
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183
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184 default: /* NGX_MAIL_SMTP_PROTOCOL */
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185 p->upstream.connection->read->handler = ngx_mail_proxy_smtp_handler;
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186 s->mail_state = ngx_smtp_start;
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187 break;
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188 }
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189 }
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190
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191
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192 static void
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193 ngx_mail_proxy_block_read(ngx_event_t *rev)
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194 {
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195 ngx_connection_t *c;
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196 ngx_mail_session_t *s;
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197
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198 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy block read");
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199
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200 if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
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201 c = rev->data;
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202 s = c->data;
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203
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204 ngx_mail_proxy_close_session(s);
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205 }
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206 }
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207
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208
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209 static void
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210 ngx_mail_proxy_pop3_handler(ngx_event_t *rev)
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211 {
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212 u_char *p;
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213 ngx_int_t rc;
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214 ngx_str_t line;
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215 ngx_connection_t *c;
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216 ngx_mail_session_t *s;
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217 ngx_mail_proxy_conf_t *pcf;
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218
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219 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
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220 "mail proxy pop3 auth handler");
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221
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222 c = rev->data;
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223 s = c->data;
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224
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225 if (rev->timedout) {
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226 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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227 "upstream timed out");
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228 c->timedout = 1;
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229 ngx_mail_proxy_internal_server_error(s);
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230 return;
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231 }
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232
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233 rc = ngx_mail_proxy_read_response(s, 0);
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234
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235 if (rc == NGX_AGAIN) {
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236 return;
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237 }
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238
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239 if (rc == NGX_ERROR) {
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240 ngx_mail_proxy_upstream_error(s);
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241 return;
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242 }
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243
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244 switch (s->mail_state) {
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245
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246 case ngx_pop3_start:
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247 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send user");
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248
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249 s->connection->log->action = "sending user name to upstream";
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250
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251 line.len = sizeof("USER ") - 1 + s->login.len + 2;
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252 line.data = ngx_palloc(c->pool, line.len);
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253 if (line.data == NULL) {
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254 ngx_mail_proxy_internal_server_error(s);
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255 return;
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256 }
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257
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258 p = ngx_cpymem(line.data, "USER ", sizeof("USER ") - 1);
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259 p = ngx_cpymem(p, s->login.data, s->login.len);
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260 *p++ = CR; *p = LF;
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261
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262 s->mail_state = ngx_pop3_user;
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263 break;
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264
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265 case ngx_pop3_user:
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266 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send pass");
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267
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268 s->connection->log->action = "sending password to upstream";
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269
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270 line.len = sizeof("PASS ") - 1 + s->passwd.len + 2;
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271 line.data = ngx_palloc(c->pool, line.len);
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272 if (line.data == NULL) {
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273 ngx_mail_proxy_internal_server_error(s);
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274 return;
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275 }
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276
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277 p = ngx_cpymem(line.data, "PASS ", sizeof("PASS ") - 1);
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278 p = ngx_cpymem(p, s->passwd.data, s->passwd.len);
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279 *p++ = CR; *p = LF;
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280
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281 s->mail_state = ngx_pop3_passwd;
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282 break;
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283
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284 case ngx_pop3_passwd:
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285 s->connection->read->handler = ngx_mail_proxy_handler;
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286 s->connection->write->handler = ngx_mail_proxy_handler;
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287 rev->handler = ngx_mail_proxy_handler;
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288 c->write->handler = ngx_mail_proxy_handler;
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289
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290 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
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291 ngx_add_timer(s->connection->read, pcf->timeout);
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292 ngx_del_timer(c->read);
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293
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294 c->log->action = NULL;
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295 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
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296
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297 ngx_mail_proxy_handler(s->connection->write);
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298
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299 return;
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300
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301 default:
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302 #if (NGX_SUPPRESS_WARN)
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303 line.len = 0;
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304 line.data = NULL;
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305 #endif
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306 break;
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307 }
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308
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309 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
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310 /*
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311 * we treat the incomplete sending as NGX_ERROR
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312 * because it is very strange here
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313 */
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314 ngx_mail_proxy_internal_server_error(s);
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315 return;
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316 }
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317
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318 s->proxy->buffer->pos = s->proxy->buffer->start;
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319 s->proxy->buffer->last = s->proxy->buffer->start;
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320 }
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321
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322
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323 static void
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324 ngx_mail_proxy_imap_handler(ngx_event_t *rev)
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325 {
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326 u_char *p;
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327 ngx_int_t rc;
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328 ngx_str_t line;
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329 ngx_connection_t *c;
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330 ngx_mail_session_t *s;
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331 ngx_mail_proxy_conf_t *pcf;
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332
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333 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
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334 "mail proxy imap auth handler");
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335
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336 c = rev->data;
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337 s = c->data;
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338
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339 if (rev->timedout) {
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340 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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341 "upstream timed out");
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342 c->timedout = 1;
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343 ngx_mail_proxy_internal_server_error(s);
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344 return;
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345 }
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346
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347 rc = ngx_mail_proxy_read_response(s, s->mail_state);
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348
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349 if (rc == NGX_AGAIN) {
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350 return;
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351 }
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352
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353 if (rc == NGX_ERROR) {
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354 ngx_mail_proxy_upstream_error(s);
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355 return;
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356 }
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357
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358 switch (s->mail_state) {
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359
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360 case ngx_imap_start:
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361 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
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362 "mail proxy send login");
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363
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364 s->connection->log->action = "sending LOGIN command to upstream";
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365
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366 line.len = s->tag.len + sizeof("LOGIN ") - 1
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367 + 1 + NGX_SIZE_T_LEN + 1 + 2;
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368 line.data = ngx_palloc(c->pool, line.len);
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369 if (line.data == NULL) {
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370 ngx_mail_proxy_internal_server_error(s);
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371 return;
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372 }
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373
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374 line.len = ngx_sprintf(line.data, "%VLOGIN {%uz}" CRLF,
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375 &s->tag, s->login.len)
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376 - line.data;
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377
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378 s->mail_state = ngx_imap_login;
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379 break;
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380
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381 case ngx_imap_login:
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382 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send user");
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383
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384 s->connection->log->action = "sending user name to upstream";
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385
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386 line.len = s->login.len + 1 + 1 + NGX_SIZE_T_LEN + 1 + 2;
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387 line.data = ngx_palloc(c->pool, line.len);
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388 if (line.data == NULL) {
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389 ngx_mail_proxy_internal_server_error(s);
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390 return;
|
|
|
391 }
|
|
|
392
|
|
|
393 line.len = ngx_sprintf(line.data, "%V {%uz}" CRLF,
|
|
|
394 &s->login, s->passwd.len)
|
|
|
395 - line.data;
|
|
|
396
|
|
|
397 s->mail_state = ngx_imap_user;
|
|
|
398 break;
|
|
|
399
|
|
|
400 case ngx_imap_user:
|
|
|
401 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
|
402 "mail proxy send passwd");
|
|
|
403
|
|
|
404 s->connection->log->action = "sending password to upstream";
|
|
|
405
|
|
|
406 line.len = s->passwd.len + 2;
|
|
|
407 line.data = ngx_palloc(c->pool, line.len);
|
|
|
408 if (line.data == NULL) {
|
|
|
409 ngx_mail_proxy_internal_server_error(s);
|
|
|
410 return;
|
|
|
411 }
|
|
|
412
|
|
|
413 p = ngx_cpymem(line.data, s->passwd.data, s->passwd.len);
|
|
|
414 *p++ = CR; *p = LF;
|
|
|
415
|
|
|
416 s->mail_state = ngx_imap_passwd;
|
|
|
417 break;
|
|
|
418
|
|
|
419 case ngx_imap_passwd:
|
|
|
420 s->connection->read->handler = ngx_mail_proxy_handler;
|
|
|
421 s->connection->write->handler = ngx_mail_proxy_handler;
|
|
|
422 rev->handler = ngx_mail_proxy_handler;
|
|
|
423 c->write->handler = ngx_mail_proxy_handler;
|
|
|
424
|
|
|
425 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
426 ngx_add_timer(s->connection->read, pcf->timeout);
|
|
|
427 ngx_del_timer(c->read);
|
|
|
428
|
|
|
429 c->log->action = NULL;
|
|
|
430 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
|
|
|
431
|
|
|
432 ngx_mail_proxy_handler(s->connection->write);
|
|
|
433
|
|
|
434 return;
|
|
|
435
|
|
|
436 default:
|
|
|
437 #if (NGX_SUPPRESS_WARN)
|
|
|
438 line.len = 0;
|
|
|
439 line.data = NULL;
|
|
|
440 #endif
|
|
|
441 break;
|
|
|
442 }
|
|
|
443
|
|
|
444 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
|
|
|
445 /*
|
|
|
446 * we treat the incomplete sending as NGX_ERROR
|
|
|
447 * because it is very strange here
|
|
|
448 */
|
|
|
449 ngx_mail_proxy_internal_server_error(s);
|
|
|
450 return;
|
|
|
451 }
|
|
|
452
|
|
|
453 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
|
454 s->proxy->buffer->last = s->proxy->buffer->start;
|
|
|
455 }
|
|
|
456
|
|
|
457
|
|
|
458 static void
|
|
|
459 ngx_mail_proxy_smtp_handler(ngx_event_t *rev)
|
|
|
460 {
|
|
|
461 u_char *p;
|
|
|
462 ngx_int_t rc;
|
|
|
463 ngx_str_t line;
|
|
|
464 ngx_connection_t *c;
|
|
|
465 ngx_mail_session_t *s;
|
|
|
466 ngx_mail_proxy_conf_t *pcf;
|
|
|
467 ngx_mail_core_srv_conf_t *cscf;
|
|
|
468
|
|
|
469 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
|
470 "mail proxy smtp auth handler");
|
|
|
471
|
|
|
472 c = rev->data;
|
|
|
473 s = c->data;
|
|
|
474
|
|
|
475 if (rev->timedout) {
|
|
|
476 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
477 "upstream timed out");
|
|
|
478 c->timedout = 1;
|
|
|
479 ngx_mail_proxy_internal_server_error(s);
|
|
|
480 return;
|
|
|
481 }
|
|
|
482
|
|
|
483 rc = ngx_mail_proxy_read_response(s, s->mail_state);
|
|
|
484
|
|
|
485 if (rc == NGX_AGAIN) {
|
|
|
486 return;
|
|
|
487 }
|
|
|
488
|
|
|
489 if (rc == NGX_ERROR) {
|
|
|
490 ngx_mail_proxy_upstream_error(s);
|
|
|
491 return;
|
|
|
492 }
|
|
|
493
|
|
|
494 switch (s->mail_state) {
|
|
|
495
|
|
|
496 case ngx_smtp_start:
|
|
|
497 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send ehlo");
|
|
|
498
|
|
|
499 s->connection->log->action = "sending HELO/EHLO to upstream";
|
|
|
500
|
|
|
501 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
|
502
|
|
|
503 line.len = sizeof("HELO ") - 1 + cscf->server_name.len + 2;
|
|
|
504 line.data = ngx_palloc(c->pool, line.len);
|
|
|
505 if (line.data == NULL) {
|
|
|
506 ngx_mail_proxy_internal_server_error(s);
|
|
|
507 return;
|
|
|
508 }
|
|
|
509
|
|
|
510 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
511
|
|
|
512 p = ngx_cpymem(line.data,
|
|
|
513 ((s->esmtp || pcf->xclient) ? "EHLO " : "HELO "),
|
|
|
514 sizeof("HELO ") - 1);
|
|
|
515
|
|
|
516 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
|
|
|
517 *p++ = CR; *p = LF;
|
|
|
518
|
|
|
519 s->mail_state = pcf->xclient ? ngx_smtp_helo: ngx_smtp_noxclient;
|
|
|
520
|
|
|
521 break;
|
|
|
522
|
|
|
523 case ngx_smtp_helo:
|
|
|
524 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
|
525 "mail proxy send xclient");
|
|
|
526
|
|
|
527 s->connection->log->action = "sending XCLIENT to upstream";
|
|
|
528
|
|
|
529 line.len = sizeof("XCLIENT PROTO=SMTP HELO= ADDR= LOGIN= "
|
|
|
530 "NAME=[UNAVAILABLE]" CRLF) - 1
|
|
|
531 + s->esmtp + s->smtp_helo.len
|
|
|
532 + s->connection->addr_text.len + s->login.len;
|
|
|
533
|
|
|
534 line.data = ngx_palloc(c->pool, line.len);
|
|
|
535 if (line.data == NULL) {
|
|
|
536 ngx_mail_proxy_internal_server_error(s);
|
|
|
537 return;
|
|
|
538 }
|
|
|
539
|
|
|
540 if (s->smtp_helo.len) {
|
|
|
541 line.len = ngx_sprintf(line.data,
|
|
|
542 "XCLIENT PROTO=%sSMTP HELO=%V ADDR=%V LOGIN=%V "
|
|
|
543 "NAME=[UNAVAILABLE]" CRLF,
|
|
|
544 (s->esmtp ? "E" : ""), &s->smtp_helo,
|
|
|
545 &s->connection->addr_text, &s->login)
|
|
|
546 - line.data;
|
|
|
547 } else {
|
|
|
548 line.len = ngx_sprintf(line.data,
|
|
|
549 "XCLIENT PROTO=SMTP ADDR=%V LOGIN=%V "
|
|
|
550 "NAME=[UNAVAILABLE]" CRLF,
|
|
|
551 &s->connection->addr_text, &s->login)
|
|
|
552 - line.data;
|
|
|
553 }
|
|
|
554
|
|
|
555 s->mail_state = ngx_smtp_xclient;
|
|
|
556 break;
|
|
|
557
|
|
|
558 case ngx_smtp_noxclient:
|
|
|
559 case ngx_smtp_xclient:
|
|
|
560
|
|
|
561 ngx_memcpy(s->proxy->buffer->start, smtp_ok, sizeof(smtp_ok) - 1);
|
|
|
562
|
|
|
563 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
|
564 s->proxy->buffer->last = s->proxy->buffer->start + sizeof(smtp_ok) - 1;
|
|
|
565
|
|
|
566 s->connection->read->handler = ngx_mail_proxy_handler;
|
|
|
567 s->connection->write->handler = ngx_mail_proxy_handler;
|
|
|
568 rev->handler = ngx_mail_proxy_handler;
|
|
|
569 c->write->handler = ngx_mail_proxy_handler;
|
|
|
570
|
|
|
571 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
572 ngx_add_timer(s->connection->read, pcf->timeout);
|
|
|
573 ngx_del_timer(c->read);
|
|
|
574
|
|
|
575 c->log->action = NULL;
|
|
|
576 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
|
|
|
577
|
|
|
578 ngx_mail_proxy_handler(s->connection->write);
|
|
|
579
|
|
|
580 return;
|
|
|
581
|
|
|
582 default:
|
|
|
583 #if (NGX_SUPPRESS_WARN)
|
|
|
584 line.len = 0;
|
|
|
585 line.data = NULL;
|
|
|
586 #endif
|
|
|
587 break;
|
|
|
588 }
|
|
|
589
|
|
|
590 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
|
|
|
591 /*
|
|
|
592 * we treat the incomplete sending as NGX_ERROR
|
|
|
593 * because it is very strange here
|
|
|
594 */
|
|
|
595 ngx_mail_proxy_internal_server_error(s);
|
|
|
596 return;
|
|
|
597 }
|
|
|
598
|
|
|
599 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
|
600 s->proxy->buffer->last = s->proxy->buffer->start;
|
|
|
601 }
|
|
|
602
|
|
|
603
|
|
|
604 static void
|
|
|
605 ngx_mail_proxy_dummy_handler(ngx_event_t *wev)
|
|
|
606 {
|
|
|
607 ngx_connection_t *c;
|
|
|
608 ngx_mail_session_t *s;
|
|
|
609
|
|
|
610 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, wev->log, 0, "mail proxy dummy handler");
|
|
|
611
|
|
|
612 if (ngx_handle_write_event(wev, 0) == NGX_ERROR) {
|
|
|
613 c = wev->data;
|
|
|
614 s = c->data;
|
|
|
615
|
|
|
616 ngx_mail_proxy_close_session(s);
|
|
|
617 }
|
|
|
618 }
|
|
|
619
|
|
|
620
|
|
|
621 static ngx_int_t
|
|
|
622 ngx_mail_proxy_read_response(ngx_mail_session_t *s, ngx_uint_t state)
|
|
|
623 {
|
|
|
624 u_char *p;
|
|
|
625 ssize_t n;
|
|
|
626 ngx_buf_t *b;
|
|
|
627 ngx_mail_proxy_conf_t *pcf;
|
|
|
628
|
|
|
629 s->connection->log->action = "reading response from upstream";
|
|
|
630
|
|
|
631 b = s->proxy->buffer;
|
|
|
632
|
|
|
633 n = s->proxy->upstream.connection->recv(s->proxy->upstream.connection,
|
|
|
634 b->last, b->end - b->last);
|
|
|
635
|
|
|
636 if (n == NGX_ERROR || n == 0) {
|
|
|
637 return NGX_ERROR;
|
|
|
638 }
|
|
|
639
|
|
|
640 if (n == NGX_AGAIN) {
|
|
|
641 return NGX_AGAIN;
|
|
|
642 }
|
|
|
643
|
|
|
644 b->last += n;
|
|
|
645
|
|
|
646 if (b->last - b->pos < 5) {
|
|
|
647 return NGX_AGAIN;
|
|
|
648 }
|
|
|
649
|
|
|
650 if (*(b->last - 2) != CR || *(b->last - 1) != LF) {
|
|
|
651 if (b->last == b->end) {
|
|
|
652 *(b->last - 1) = '\0';
|
|
|
653 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
|
654 "upstream sent too long response line: \"%s\"",
|
|
|
655 b->pos);
|
|
|
656 return NGX_ERROR;
|
|
|
657 }
|
|
|
658
|
|
|
659 return NGX_AGAIN;
|
|
|
660 }
|
|
|
661
|
|
|
662 p = b->pos;
|
|
|
663
|
|
|
664 switch (s->protocol) {
|
|
|
665
|
|
|
666 case NGX_MAIL_POP3_PROTOCOL:
|
|
|
667 if (p[0] == '+' && p[1] == 'O' && p[2] == 'K') {
|
|
|
668 return NGX_OK;
|
|
|
669 }
|
|
|
670 break;
|
|
|
671
|
|
|
672 case NGX_MAIL_IMAP_PROTOCOL:
|
|
|
673 switch (state) {
|
|
|
674
|
|
|
675 case ngx_imap_start:
|
|
|
676 if (p[0] == '*' && p[1] == ' ' && p[2] == 'O' && p[3] == 'K') {
|
|
|
677 return NGX_OK;
|
|
|
678 }
|
|
|
679 break;
|
|
|
680
|
|
|
681 case ngx_imap_login:
|
|
|
682 case ngx_imap_user:
|
|
|
683 if (p[0] == '+') {
|
|
|
684 return NGX_OK;
|
|
|
685 }
|
|
|
686 break;
|
|
|
687
|
|
|
688 case ngx_imap_passwd:
|
|
|
689 if (ngx_strncmp(p, s->tag.data, s->tag.len) == 0) {
|
|
|
690 p += s->tag.len;
|
|
|
691 if (p[0] == 'O' && p[1] == 'K') {
|
|
|
692 return NGX_OK;
|
|
|
693 }
|
|
|
694 }
|
|
|
695 break;
|
|
|
696 }
|
|
|
697
|
|
|
698 break;
|
|
|
699
|
|
|
700 default: /* NGX_MAIL_SMTP_PROTOCOL */
|
|
|
701 switch (state) {
|
|
|
702
|
|
|
703 case ngx_smtp_helo:
|
|
|
704 case ngx_smtp_noxclient:
|
|
|
705 if (p[0] == '2' && p[1] == '5' && p[2] == '0') {
|
|
|
706 return NGX_OK;
|
|
|
707 }
|
|
|
708 break;
|
|
|
709
|
|
|
710 case ngx_smtp_start:
|
|
|
711 case ngx_smtp_xclient:
|
|
|
712 if (p[0] == '2' && p[1] == '2' && p[2] == '0') {
|
|
|
713 return NGX_OK;
|
|
|
714 }
|
|
|
715 break;
|
|
|
716 }
|
|
|
717
|
|
|
718 break;
|
|
|
719 }
|
|
|
720
|
|
|
721 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
722
|
|
|
723 if (pcf->pass_error_message == 0) {
|
|
|
724 *(b->last - 2) = '\0';
|
|
|
725 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
|
726 "upstream sent invalid response: \"%s\"", p);
|
|
|
727 return NGX_ERROR;
|
|
|
728 }
|
|
|
729
|
|
|
730 s->out.len = b->last - p - 2;
|
|
|
731 s->out.data = p;
|
|
|
732
|
|
|
733 ngx_log_error(NGX_LOG_INFO, s->connection->log, 0,
|
|
|
734 "upstream sent invalid response: \"%V\"", &s->out);
|
|
|
735
|
|
|
736 s->out.len = b->last - b->pos;
|
|
|
737 s->out.data = b->pos;
|
|
|
738
|
|
|
739 return NGX_ERROR;
|
|
|
740 }
|
|
|
741
|
|
|
742
|
|
|
743 static void
|
|
|
744 ngx_mail_proxy_handler(ngx_event_t *ev)
|
|
|
745 {
|
|
|
746 char *action, *recv_action, *send_action;
|
|
|
747 size_t size;
|
|
|
748 ssize_t n;
|
|
|
749 ngx_buf_t *b;
|
|
|
750 ngx_uint_t do_write;
|
|
|
751 ngx_connection_t *c, *src, *dst;
|
|
|
752 ngx_mail_session_t *s;
|
|
|
753 ngx_mail_proxy_conf_t *pcf;
|
|
|
754
|
|
|
755 c = ev->data;
|
|
|
756 s = c->data;
|
|
|
757
|
|
|
758 if (ev->timedout) {
|
|
|
759 c->log->action = "proxying";
|
|
|
760
|
|
|
761 if (c == s->connection) {
|
|
|
762 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
763 "client timed out");
|
|
|
764 c->timedout = 1;
|
|
|
765
|
|
|
766 } else {
|
|
|
767 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
768 "upstream timed out");
|
|
|
769 }
|
|
|
770
|
|
|
771 ngx_mail_proxy_close_session(s);
|
|
|
772 return;
|
|
|
773 }
|
|
|
774
|
|
|
775 if (c == s->connection) {
|
|
|
776 if (ev->write) {
|
|
|
777 recv_action = "proxying and reading from upstream";
|
|
|
778 send_action = "proxying and sending to client";
|
|
|
779 src = s->proxy->upstream.connection;
|
|
|
780 dst = c;
|
|
|
781 b = s->proxy->buffer;
|
|
|
782
|
|
|
783 } else {
|
|
|
784 recv_action = "proxying and reading from client";
|
|
|
785 send_action = "proxying and sending to upstream";
|
|
|
786 src = c;
|
|
|
787 dst = s->proxy->upstream.connection;
|
|
|
788 b = s->buffer;
|
|
|
789 }
|
|
|
790
|
|
|
791 } else {
|
|
|
792 if (ev->write) {
|
|
|
793 recv_action = "proxying and reading from client";
|
|
|
794 send_action = "proxying and sending to upstream";
|
|
|
795 src = s->connection;
|
|
|
796 dst = c;
|
|
|
797 b = s->buffer;
|
|
|
798
|
|
|
799 } else {
|
|
|
800 recv_action = "proxying and reading from upstream";
|
|
|
801 send_action = "proxying and sending to client";
|
|
|
802 src = c;
|
|
|
803 dst = s->connection;
|
|
|
804 b = s->proxy->buffer;
|
|
|
805 }
|
|
|
806 }
|
|
|
807
|
|
|
808 do_write = ev->write ? 1 : 0;
|
|
|
809
|
|
|
810 ngx_log_debug3(NGX_LOG_DEBUG_MAIL, ev->log, 0,
|
|
|
811 "mail proxy handler: %d, #%d > #%d",
|
|
|
812 do_write, src->fd, dst->fd);
|
|
|
813
|
|
|
814 for ( ;; ) {
|
|
|
815
|
|
|
816 if (do_write) {
|
|
|
817
|
|
|
818 size = b->last - b->pos;
|
|
|
819
|
|
|
820 if (size && dst->write->ready) {
|
|
|
821 c->log->action = send_action;
|
|
|
822
|
|
|
823 n = dst->send(dst, b->pos, size);
|
|
|
824
|
|
|
825 if (n == NGX_ERROR) {
|
|
|
826 ngx_mail_proxy_close_session(s);
|
|
|
827 return;
|
|
|
828 }
|
|
|
829
|
|
|
830 if (n > 0) {
|
|
|
831 b->pos += n;
|
|
|
832
|
|
|
833 if (b->pos == b->last) {
|
|
|
834 b->pos = b->start;
|
|
|
835 b->last = b->start;
|
|
|
836 }
|
|
|
837 }
|
|
|
838 }
|
|
|
839 }
|
|
|
840
|
|
|
841 size = b->end - b->last;
|
|
|
842
|
|
|
843 if (size && src->read->ready) {
|
|
|
844 c->log->action = recv_action;
|
|
|
845
|
|
|
846 n = src->recv(src, b->last, size);
|
|
|
847
|
|
|
848 if (n == NGX_AGAIN || n == 0) {
|
|
|
849 break;
|
|
|
850 }
|
|
|
851
|
|
|
852 if (n > 0) {
|
|
|
853 do_write = 1;
|
|
|
854 b->last += n;
|
|
|
855
|
|
|
856 continue;
|
|
|
857 }
|
|
|
858
|
|
|
859 if (n == NGX_ERROR) {
|
|
|
860 src->read->eof = 1;
|
|
|
861 }
|
|
|
862 }
|
|
|
863
|
|
|
864 break;
|
|
|
865 }
|
|
|
866
|
|
|
867 c->log->action = "proxying";
|
|
|
868
|
|
|
869 if ((s->connection->read->eof || s->proxy->upstream.connection->read->eof)
|
|
|
870 && s->buffer->pos == s->buffer->last
|
|
|
871 && s->proxy->buffer->pos == s->proxy->buffer->last)
|
|
|
872 {
|
|
|
873 action = c->log->action;
|
|
|
874 c->log->action = NULL;
|
|
|
875 ngx_log_error(NGX_LOG_INFO, c->log, 0, "proxied session done");
|
|
|
876 c->log->action = action;
|
|
|
877
|
|
|
878 ngx_mail_proxy_close_session(s);
|
|
|
879 return;
|
|
|
880 }
|
|
|
881
|
|
|
882 if (ngx_handle_write_event(dst->write, 0) == NGX_ERROR) {
|
|
|
883 ngx_mail_proxy_close_session(s);
|
|
|
884 return;
|
|
|
885 }
|
|
|
886
|
|
|
887 if (ngx_handle_read_event(dst->read, 0) == NGX_ERROR) {
|
|
|
888 ngx_mail_proxy_close_session(s);
|
|
|
889 return;
|
|
|
890 }
|
|
|
891
|
|
|
892 if (ngx_handle_write_event(src->write, 0) == NGX_ERROR) {
|
|
|
893 ngx_mail_proxy_close_session(s);
|
|
|
894 return;
|
|
|
895 }
|
|
|
896
|
|
|
897 if (ngx_handle_read_event(src->read, 0) == NGX_ERROR) {
|
|
|
898 ngx_mail_proxy_close_session(s);
|
|
|
899 return;
|
|
|
900 }
|
|
|
901
|
|
|
902 if (c == s->connection) {
|
|
|
903 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
904 ngx_add_timer(c->read, pcf->timeout);
|
|
|
905 }
|
|
|
906 }
|
|
|
907
|
|
|
908
|
|
|
909 static void
|
|
|
910 ngx_mail_proxy_upstream_error(ngx_mail_session_t *s)
|
|
|
911 {
|
|
|
912 if (s->proxy->upstream.connection) {
|
|
|
913 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
|
914 "close mail proxy connection: %d",
|
|
|
915 s->proxy->upstream.connection->fd);
|
|
|
916
|
|
|
917 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
918 }
|
|
|
919
|
|
|
920 if (s->out.len == 0) {
|
|
|
921 ngx_mail_session_internal_server_error(s);
|
|
|
922 return;
|
|
|
923 }
|
|
|
924
|
|
|
925 s->quit = 1;
|
|
|
926 ngx_mail_send(s->connection->write);
|
|
|
927 }
|
|
|
928
|
|
|
929
|
|
|
930 static void
|
|
|
931 ngx_mail_proxy_internal_server_error(ngx_mail_session_t *s)
|
|
|
932 {
|
|
|
933 if (s->proxy->upstream.connection) {
|
|
|
934 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
|
935 "close mail proxy connection: %d",
|
|
|
936 s->proxy->upstream.connection->fd);
|
|
|
937
|
|
|
938 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
939 }
|
|
|
940
|
|
|
941 ngx_mail_session_internal_server_error(s);
|
|
|
942 }
|
|
|
943
|
|
|
944
|
|
|
945 static void
|
|
|
946 ngx_mail_proxy_close_session(ngx_mail_session_t *s)
|
|
|
947 {
|
|
|
948 if (s->proxy->upstream.connection) {
|
|
|
949 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
|
950 "close mail proxy connection: %d",
|
|
|
951 s->proxy->upstream.connection->fd);
|
|
|
952
|
|
|
953 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
954 }
|
|
|
955
|
|
|
956 ngx_mail_close_connection(s->connection);
|
|
|
957 }
|
|
|
958
|
|
|
959
|
|
|
960 static void *
|
|
|
961 ngx_mail_proxy_create_conf(ngx_conf_t *cf)
|
|
|
962 {
|
|
|
963 ngx_mail_proxy_conf_t *pcf;
|
|
|
964
|
|
|
965 pcf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_proxy_conf_t));
|
|
|
966 if (pcf == NULL) {
|
|
|
967 return NGX_CONF_ERROR;
|
|
|
968 }
|
|
|
969
|
|
|
970 pcf->enable = NGX_CONF_UNSET;
|
|
|
971 pcf->pass_error_message = NGX_CONF_UNSET;
|
|
|
972 pcf->xclient = NGX_CONF_UNSET;
|
|
|
973 pcf->buffer_size = NGX_CONF_UNSET_SIZE;
|
|
|
974 pcf->timeout = NGX_CONF_UNSET_MSEC;
|
|
|
975
|
|
|
976 return pcf;
|
|
|
977 }
|
|
|
978
|
|
|
979
|
|
|
980 static char *
|
|
|
981 ngx_mail_proxy_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
982 {
|
|
|
983 ngx_mail_proxy_conf_t *prev = parent;
|
|
|
984 ngx_mail_proxy_conf_t *conf = child;
|
|
|
985
|
|
|
986 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
|
987 ngx_conf_merge_value(conf->pass_error_message, prev->pass_error_message, 0);
|
|
|
988 ngx_conf_merge_value(conf->xclient, prev->xclient, 1);
|
|
|
989 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size,
|
|
|
990 (size_t) ngx_pagesize);
|
|
|
991 ngx_conf_merge_msec_value(conf->timeout, prev->timeout, 24 * 60 * 60000);
|
|
|
992
|
|
|
993 return NGX_CONF_OK;
|
|
|
994 }
|
