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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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336
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81 NULL, /* protocol */
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82
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290
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83 NULL, /* create main configuration */
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84 NULL, /* init main configuration */
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85
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86 ngx_mail_proxy_create_conf, /* create server configuration */
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87 ngx_mail_proxy_merge_conf /* merge server configuration */
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88 };
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89
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90
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91 ngx_module_t ngx_mail_proxy_module = {
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92 NGX_MODULE_V1,
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93 &ngx_mail_proxy_module_ctx, /* module context */
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94 ngx_mail_proxy_commands, /* module directives */
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95 NGX_MAIL_MODULE, /* module type */
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96 NULL, /* init master */
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97 NULL, /* init module */
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98 NULL, /* init process */
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99 NULL, /* init thread */
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100 NULL, /* exit thread */
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101 NULL, /* exit process */
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102 NULL, /* exit master */
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103 NGX_MODULE_V1_PADDING
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104 };
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105
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106
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107 static u_char smtp_ok[] = "235 2.0.0 OK" CRLF;
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108
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109
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110 void
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111 ngx_mail_proxy_init(ngx_mail_session_t *s, ngx_peer_addr_t *peer)
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112 {
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113 int keepalive;
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114 ngx_int_t rc;
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115 ngx_mail_proxy_ctx_t *p;
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116 ngx_mail_proxy_conf_t *pcf;
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117 ngx_mail_core_srv_conf_t *cscf;
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118
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119 s->connection->log->action = "connecting to upstream";
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120
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121 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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122
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123 if (cscf->so_keepalive) {
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124 keepalive = 1;
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125
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126 if (setsockopt(s->connection->fd, SOL_SOCKET, SO_KEEPALIVE,
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127 (const void *) &keepalive, sizeof(int))
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128 == -1)
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129 {
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130 ngx_log_error(NGX_LOG_ALERT, s->connection->log, ngx_socket_errno,
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131 "setsockopt(SO_KEEPALIVE) failed");
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132 }
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133 }
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134
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135 p = ngx_pcalloc(s->connection->pool, sizeof(ngx_mail_proxy_ctx_t));
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136 if (p == NULL) {
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137 ngx_mail_session_internal_server_error(s);
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138 return;
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139 }
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140
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141 s->proxy = p;
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142
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143 p->upstream.sockaddr = peer->sockaddr;
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144 p->upstream.socklen = peer->socklen;
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145 p->upstream.name = &peer->name;
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146 p->upstream.get = ngx_event_get_peer;
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147 p->upstream.log = s->connection->log;
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148 p->upstream.log_error = NGX_ERROR_ERR;
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149
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150 rc = ngx_event_connect_peer(&p->upstream);
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151
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152 if (rc == NGX_ERROR || rc == NGX_BUSY || rc == NGX_DECLINED) {
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153 ngx_mail_proxy_internal_server_error(s);
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154 return;
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155 }
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156
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157 ngx_add_timer(p->upstream.connection->read, cscf->timeout);
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158
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159 p->upstream.connection->data = s;
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160 p->upstream.connection->pool = s->connection->pool;
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161
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162 s->connection->read->handler = ngx_mail_proxy_block_read;
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163 p->upstream.connection->write->handler = ngx_mail_proxy_dummy_handler;
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164
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165 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
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166
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167 s->proxy->buffer = ngx_create_temp_buf(s->connection->pool,
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168 pcf->buffer_size);
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169 if (s->proxy->buffer == NULL) {
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170 ngx_mail_proxy_internal_server_error(s);
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171 return;
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172 }
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173
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372
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174 s->out.len = 0;
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175
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290
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176 switch (s->protocol) {
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177
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178 case NGX_MAIL_POP3_PROTOCOL:
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179 p->upstream.connection->read->handler = ngx_mail_proxy_pop3_handler;
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180 s->mail_state = ngx_pop3_start;
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181 break;
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182
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183 case NGX_MAIL_IMAP_PROTOCOL:
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184 p->upstream.connection->read->handler = ngx_mail_proxy_imap_handler;
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185 s->mail_state = ngx_imap_start;
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186 break;
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187
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188 default: /* NGX_MAIL_SMTP_PROTOCOL */
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189 p->upstream.connection->read->handler = ngx_mail_proxy_smtp_handler;
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190 s->mail_state = ngx_smtp_start;
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191 break;
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192 }
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193 }
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194
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195
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196 static void
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197 ngx_mail_proxy_block_read(ngx_event_t *rev)
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198 {
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199 ngx_connection_t *c;
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200 ngx_mail_session_t *s;
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201
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202 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy block read");
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203
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204 if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
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205 c = rev->data;
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206 s = c->data;
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207
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208 ngx_mail_proxy_close_session(s);
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209 }
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210 }
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211
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212
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213 static void
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214 ngx_mail_proxy_pop3_handler(ngx_event_t *rev)
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215 {
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216 u_char *p;
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217 ngx_int_t rc;
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218 ngx_str_t line;
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219 ngx_connection_t *c;
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220 ngx_mail_session_t *s;
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221 ngx_mail_proxy_conf_t *pcf;
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222
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223 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
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224 "mail proxy pop3 auth handler");
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225
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226 c = rev->data;
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227 s = c->data;
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228
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229 if (rev->timedout) {
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230 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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231 "upstream timed out");
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232 c->timedout = 1;
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233 ngx_mail_proxy_internal_server_error(s);
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234 return;
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235 }
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236
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237 rc = ngx_mail_proxy_read_response(s, 0);
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238
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239 if (rc == NGX_AGAIN) {
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240 return;
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241 }
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242
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243 if (rc == NGX_ERROR) {
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244 ngx_mail_proxy_upstream_error(s);
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245 return;
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246 }
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247
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248 switch (s->mail_state) {
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249
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250 case ngx_pop3_start:
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251 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send user");
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252
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253 s->connection->log->action = "sending user name to upstream";
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254
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255 line.len = sizeof("USER ") - 1 + s->login.len + 2;
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256 line.data = ngx_palloc(c->pool, line.len);
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257 if (line.data == NULL) {
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258 ngx_mail_proxy_internal_server_error(s);
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259 return;
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260 }
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261
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262 p = ngx_cpymem(line.data, "USER ", sizeof("USER ") - 1);
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263 p = ngx_cpymem(p, s->login.data, s->login.len);
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264 *p++ = CR; *p = LF;
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265
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266 s->mail_state = ngx_pop3_user;
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267 break;
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268
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269 case ngx_pop3_user:
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270 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send pass");
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271
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272 s->connection->log->action = "sending password to upstream";
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273
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274 line.len = sizeof("PASS ") - 1 + s->passwd.len + 2;
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275 line.data = ngx_palloc(c->pool, line.len);
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276 if (line.data == NULL) {
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277 ngx_mail_proxy_internal_server_error(s);
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278 return;
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279 }
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280
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281 p = ngx_cpymem(line.data, "PASS ", sizeof("PASS ") - 1);
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282 p = ngx_cpymem(p, s->passwd.data, s->passwd.len);
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283 *p++ = CR; *p = LF;
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284
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285 s->mail_state = ngx_pop3_passwd;
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286 break;
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287
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288 case ngx_pop3_passwd:
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289 s->connection->read->handler = ngx_mail_proxy_handler;
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290 s->connection->write->handler = ngx_mail_proxy_handler;
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291 rev->handler = ngx_mail_proxy_handler;
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292 c->write->handler = ngx_mail_proxy_handler;
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293
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294 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
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295 ngx_add_timer(s->connection->read, pcf->timeout);
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296 ngx_del_timer(c->read);
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297
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298 c->log->action = NULL;
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299 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
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300
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301 ngx_mail_proxy_handler(s->connection->write);
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302
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303 return;
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304
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305 default:
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306 #if (NGX_SUPPRESS_WARN)
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307 line.len = 0;
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308 line.data = NULL;
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309 #endif
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310 break;
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311 }
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312
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313 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
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314 /*
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315 * we treat the incomplete sending as NGX_ERROR
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316 * because it is very strange here
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317 */
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318 ngx_mail_proxy_internal_server_error(s);
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319 return;
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320 }
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321
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322 s->proxy->buffer->pos = s->proxy->buffer->start;
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323 s->proxy->buffer->last = s->proxy->buffer->start;
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324 }
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325
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326
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327 static void
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328 ngx_mail_proxy_imap_handler(ngx_event_t *rev)
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329 {
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330 u_char *p;
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331 ngx_int_t rc;
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332 ngx_str_t line;
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333 ngx_connection_t *c;
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334 ngx_mail_session_t *s;
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335 ngx_mail_proxy_conf_t *pcf;
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336
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337 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
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338 "mail proxy imap auth handler");
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339
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340 c = rev->data;
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341 s = c->data;
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342
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343 if (rev->timedout) {
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344 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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345 "upstream timed out");
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346 c->timedout = 1;
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347 ngx_mail_proxy_internal_server_error(s);
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348 return;
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349 }
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350
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351 rc = ngx_mail_proxy_read_response(s, s->mail_state);
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352
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353 if (rc == NGX_AGAIN) {
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354 return;
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355 }
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356
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357 if (rc == NGX_ERROR) {
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358 ngx_mail_proxy_upstream_error(s);
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359 return;
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360 }
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361
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362 switch (s->mail_state) {
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363
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364 case ngx_imap_start:
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365 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
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366 "mail proxy send login");
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367
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368 s->connection->log->action = "sending LOGIN command to upstream";
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369
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370 line.len = s->tag.len + sizeof("LOGIN ") - 1
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371 + 1 + NGX_SIZE_T_LEN + 1 + 2;
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372 line.data = ngx_palloc(c->pool, line.len);
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373 if (line.data == NULL) {
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374 ngx_mail_proxy_internal_server_error(s);
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375 return;
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376 }
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377
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378 line.len = ngx_sprintf(line.data, "%VLOGIN {%uz}" CRLF,
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379 &s->tag, s->login.len)
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380 - line.data;
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381
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382 s->mail_state = ngx_imap_login;
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383 break;
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384
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385 case ngx_imap_login:
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386 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send user");
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387
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388 s->connection->log->action = "sending user name to upstream";
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389
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390 line.len = s->login.len + 1 + 1 + NGX_SIZE_T_LEN + 1 + 2;
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391 line.data = ngx_palloc(c->pool, line.len);
|
|
|
392 if (line.data == NULL) {
|
|
|
393 ngx_mail_proxy_internal_server_error(s);
|
|
|
394 return;
|
|
|
395 }
|
|
|
396
|
|
|
397 line.len = ngx_sprintf(line.data, "%V {%uz}" CRLF,
|
|
|
398 &s->login, s->passwd.len)
|
|
|
399 - line.data;
|
|
|
400
|
|
|
401 s->mail_state = ngx_imap_user;
|
|
|
402 break;
|
|
|
403
|
|
|
404 case ngx_imap_user:
|
|
|
405 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
|
406 "mail proxy send passwd");
|
|
|
407
|
|
|
408 s->connection->log->action = "sending password to upstream";
|
|
|
409
|
|
|
410 line.len = s->passwd.len + 2;
|
|
|
411 line.data = ngx_palloc(c->pool, line.len);
|
|
|
412 if (line.data == NULL) {
|
|
|
413 ngx_mail_proxy_internal_server_error(s);
|
|
|
414 return;
|
|
|
415 }
|
|
|
416
|
|
|
417 p = ngx_cpymem(line.data, s->passwd.data, s->passwd.len);
|
|
|
418 *p++ = CR; *p = LF;
|
|
|
419
|
|
|
420 s->mail_state = ngx_imap_passwd;
|
|
|
421 break;
|
|
|
422
|
|
|
423 case ngx_imap_passwd:
|
|
|
424 s->connection->read->handler = ngx_mail_proxy_handler;
|
|
|
425 s->connection->write->handler = ngx_mail_proxy_handler;
|
|
|
426 rev->handler = ngx_mail_proxy_handler;
|
|
|
427 c->write->handler = ngx_mail_proxy_handler;
|
|
|
428
|
|
|
429 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
430 ngx_add_timer(s->connection->read, pcf->timeout);
|
|
|
431 ngx_del_timer(c->read);
|
|
|
432
|
|
|
433 c->log->action = NULL;
|
|
|
434 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
|
|
|
435
|
|
|
436 ngx_mail_proxy_handler(s->connection->write);
|
|
|
437
|
|
|
438 return;
|
|
|
439
|
|
|
440 default:
|
|
|
441 #if (NGX_SUPPRESS_WARN)
|
|
|
442 line.len = 0;
|
|
|
443 line.data = NULL;
|
|
|
444 #endif
|
|
|
445 break;
|
|
|
446 }
|
|
|
447
|
|
|
448 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
|
|
|
449 /*
|
|
|
450 * we treat the incomplete sending as NGX_ERROR
|
|
|
451 * because it is very strange here
|
|
|
452 */
|
|
|
453 ngx_mail_proxy_internal_server_error(s);
|
|
|
454 return;
|
|
|
455 }
|
|
|
456
|
|
|
457 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
|
458 s->proxy->buffer->last = s->proxy->buffer->start;
|
|
|
459 }
|
|
|
460
|
|
|
461
|
|
|
462 static void
|
|
|
463 ngx_mail_proxy_smtp_handler(ngx_event_t *rev)
|
|
|
464 {
|
|
|
465 u_char *p;
|
|
|
466 ngx_int_t rc;
|
|
|
467 ngx_str_t line;
|
|
|
468 ngx_connection_t *c;
|
|
|
469 ngx_mail_session_t *s;
|
|
|
470 ngx_mail_proxy_conf_t *pcf;
|
|
|
471 ngx_mail_core_srv_conf_t *cscf;
|
|
|
472
|
|
|
473 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
|
474 "mail proxy smtp auth handler");
|
|
|
475
|
|
|
476 c = rev->data;
|
|
|
477 s = c->data;
|
|
|
478
|
|
|
479 if (rev->timedout) {
|
|
|
480 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
481 "upstream timed out");
|
|
|
482 c->timedout = 1;
|
|
|
483 ngx_mail_proxy_internal_server_error(s);
|
|
|
484 return;
|
|
|
485 }
|
|
|
486
|
|
|
487 rc = ngx_mail_proxy_read_response(s, s->mail_state);
|
|
|
488
|
|
|
489 if (rc == NGX_AGAIN) {
|
|
|
490 return;
|
|
|
491 }
|
|
|
492
|
|
|
493 if (rc == NGX_ERROR) {
|
|
|
494 ngx_mail_proxy_upstream_error(s);
|
|
|
495 return;
|
|
|
496 }
|
|
|
497
|
|
|
498 switch (s->mail_state) {
|
|
|
499
|
|
|
500 case ngx_smtp_start:
|
|
|
501 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send ehlo");
|
|
|
502
|
|
|
503 s->connection->log->action = "sending HELO/EHLO to upstream";
|
|
|
504
|
|
|
505 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
|
506
|
|
|
507 line.len = sizeof("HELO ") - 1 + cscf->server_name.len + 2;
|
|
|
508 line.data = ngx_palloc(c->pool, line.len);
|
|
|
509 if (line.data == NULL) {
|
|
|
510 ngx_mail_proxy_internal_server_error(s);
|
|
|
511 return;
|
|
|
512 }
|
|
|
513
|
|
|
514 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
515
|
|
|
516 p = ngx_cpymem(line.data,
|
|
|
517 ((s->esmtp || pcf->xclient) ? "EHLO " : "HELO "),
|
|
|
518 sizeof("HELO ") - 1);
|
|
|
519
|
|
|
520 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
|
|
|
521 *p++ = CR; *p = LF;
|
|
|
522
|
|
|
523 s->mail_state = pcf->xclient ? ngx_smtp_helo: ngx_smtp_noxclient;
|
|
|
524
|
|
|
525 break;
|
|
|
526
|
|
|
527 case ngx_smtp_helo:
|
|
|
528 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
|
529 "mail proxy send xclient");
|
|
|
530
|
|
|
531 s->connection->log->action = "sending XCLIENT to upstream";
|
|
|
532
|
|
366
|
533 line.len = sizeof("XCLIENT PROTO=SMTP HELO= ADDR= LOGIN= NAME="
|
|
|
534 CRLF) - 1
|
|
290
|
535 + s->esmtp + s->smtp_helo.len
|
|
366
|
536 + s->connection->addr_text.len + s->login.len + s->host.len;
|
|
290
|
537
|
|
|
538 line.data = ngx_palloc(c->pool, line.len);
|
|
|
539 if (line.data == NULL) {
|
|
|
540 ngx_mail_proxy_internal_server_error(s);
|
|
|
541 return;
|
|
|
542 }
|
|
|
543
|
|
|
544 if (s->smtp_helo.len) {
|
|
|
545 line.len = ngx_sprintf(line.data,
|
|
|
546 "XCLIENT PROTO=%sSMTP HELO=%V ADDR=%V LOGIN=%V "
|
|
366
|
547 "NAME=%V" CRLF,
|
|
290
|
548 (s->esmtp ? "E" : ""), &s->smtp_helo,
|
|
366
|
549 &s->connection->addr_text, &s->login, &s->host)
|
|
290
|
550 - line.data;
|
|
|
551 } else {
|
|
|
552 line.len = ngx_sprintf(line.data,
|
|
366
|
553 "XCLIENT PROTO=SMTP ADDR=%V LOGIN=%V NAME=%V" CRLF,
|
|
|
554 &s->connection->addr_text, &s->login, &s->host)
|
|
290
|
555 - line.data;
|
|
|
556 }
|
|
|
557
|
|
|
558 s->mail_state = ngx_smtp_xclient;
|
|
|
559 break;
|
|
|
560
|
|
|
561 case ngx_smtp_noxclient:
|
|
|
562 case ngx_smtp_xclient:
|
|
|
563
|
|
|
564 ngx_memcpy(s->proxy->buffer->start, smtp_ok, sizeof(smtp_ok) - 1);
|
|
|
565
|
|
|
566 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
|
567 s->proxy->buffer->last = s->proxy->buffer->start + sizeof(smtp_ok) - 1;
|
|
|
568
|
|
|
569 s->connection->read->handler = ngx_mail_proxy_handler;
|
|
|
570 s->connection->write->handler = ngx_mail_proxy_handler;
|
|
|
571 rev->handler = ngx_mail_proxy_handler;
|
|
|
572 c->write->handler = ngx_mail_proxy_handler;
|
|
|
573
|
|
|
574 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
575 ngx_add_timer(s->connection->read, pcf->timeout);
|
|
|
576 ngx_del_timer(c->read);
|
|
|
577
|
|
|
578 c->log->action = NULL;
|
|
|
579 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
|
|
|
580
|
|
|
581 ngx_mail_proxy_handler(s->connection->write);
|
|
|
582
|
|
|
583 return;
|
|
|
584
|
|
|
585 default:
|
|
|
586 #if (NGX_SUPPRESS_WARN)
|
|
|
587 line.len = 0;
|
|
|
588 line.data = NULL;
|
|
|
589 #endif
|
|
|
590 break;
|
|
|
591 }
|
|
|
592
|
|
|
593 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
|
|
|
594 /*
|
|
|
595 * we treat the incomplete sending as NGX_ERROR
|
|
|
596 * because it is very strange here
|
|
|
597 */
|
|
|
598 ngx_mail_proxy_internal_server_error(s);
|
|
|
599 return;
|
|
|
600 }
|
|
|
601
|
|
|
602 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
|
603 s->proxy->buffer->last = s->proxy->buffer->start;
|
|
|
604 }
|
|
|
605
|
|
|
606
|
|
|
607 static void
|
|
|
608 ngx_mail_proxy_dummy_handler(ngx_event_t *wev)
|
|
|
609 {
|
|
|
610 ngx_connection_t *c;
|
|
|
611 ngx_mail_session_t *s;
|
|
|
612
|
|
|
613 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, wev->log, 0, "mail proxy dummy handler");
|
|
|
614
|
|
|
615 if (ngx_handle_write_event(wev, 0) == NGX_ERROR) {
|
|
|
616 c = wev->data;
|
|
|
617 s = c->data;
|
|
|
618
|
|
|
619 ngx_mail_proxy_close_session(s);
|
|
|
620 }
|
|
|
621 }
|
|
|
622
|
|
|
623
|
|
|
624 static ngx_int_t
|
|
|
625 ngx_mail_proxy_read_response(ngx_mail_session_t *s, ngx_uint_t state)
|
|
|
626 {
|
|
|
627 u_char *p;
|
|
|
628 ssize_t n;
|
|
|
629 ngx_buf_t *b;
|
|
|
630 ngx_mail_proxy_conf_t *pcf;
|
|
|
631
|
|
|
632 s->connection->log->action = "reading response from upstream";
|
|
|
633
|
|
|
634 b = s->proxy->buffer;
|
|
|
635
|
|
|
636 n = s->proxy->upstream.connection->recv(s->proxy->upstream.connection,
|
|
|
637 b->last, b->end - b->last);
|
|
|
638
|
|
|
639 if (n == NGX_ERROR || n == 0) {
|
|
|
640 return NGX_ERROR;
|
|
|
641 }
|
|
|
642
|
|
|
643 if (n == NGX_AGAIN) {
|
|
|
644 return NGX_AGAIN;
|
|
|
645 }
|
|
|
646
|
|
|
647 b->last += n;
|
|
|
648
|
|
|
649 if (b->last - b->pos < 5) {
|
|
|
650 return NGX_AGAIN;
|
|
|
651 }
|
|
|
652
|
|
|
653 if (*(b->last - 2) != CR || *(b->last - 1) != LF) {
|
|
|
654 if (b->last == b->end) {
|
|
|
655 *(b->last - 1) = '\0';
|
|
|
656 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
|
657 "upstream sent too long response line: \"%s\"",
|
|
|
658 b->pos);
|
|
|
659 return NGX_ERROR;
|
|
|
660 }
|
|
|
661
|
|
|
662 return NGX_AGAIN;
|
|
|
663 }
|
|
|
664
|
|
|
665 p = b->pos;
|
|
|
666
|
|
|
667 switch (s->protocol) {
|
|
|
668
|
|
|
669 case NGX_MAIL_POP3_PROTOCOL:
|
|
|
670 if (p[0] == '+' && p[1] == 'O' && p[2] == 'K') {
|
|
|
671 return NGX_OK;
|
|
|
672 }
|
|
|
673 break;
|
|
|
674
|
|
|
675 case NGX_MAIL_IMAP_PROTOCOL:
|
|
|
676 switch (state) {
|
|
|
677
|
|
|
678 case ngx_imap_start:
|
|
|
679 if (p[0] == '*' && p[1] == ' ' && p[2] == 'O' && p[3] == 'K') {
|
|
|
680 return NGX_OK;
|
|
|
681 }
|
|
|
682 break;
|
|
|
683
|
|
|
684 case ngx_imap_login:
|
|
|
685 case ngx_imap_user:
|
|
|
686 if (p[0] == '+') {
|
|
|
687 return NGX_OK;
|
|
|
688 }
|
|
|
689 break;
|
|
|
690
|
|
|
691 case ngx_imap_passwd:
|
|
|
692 if (ngx_strncmp(p, s->tag.data, s->tag.len) == 0) {
|
|
|
693 p += s->tag.len;
|
|
|
694 if (p[0] == 'O' && p[1] == 'K') {
|
|
|
695 return NGX_OK;
|
|
|
696 }
|
|
|
697 }
|
|
|
698 break;
|
|
|
699 }
|
|
|
700
|
|
|
701 break;
|
|
|
702
|
|
|
703 default: /* NGX_MAIL_SMTP_PROTOCOL */
|
|
|
704 switch (state) {
|
|
|
705
|
|
|
706 case ngx_smtp_helo:
|
|
|
707 case ngx_smtp_noxclient:
|
|
296
|
708 if (p[0] == '2' && p[1] == '5' && p[2] == '0') {
|
|
|
709 return NGX_OK;
|
|
|
710 }
|
|
|
711 break;
|
|
290
|
712
|
|
|
713 case ngx_smtp_start:
|
|
|
714 case ngx_smtp_xclient:
|
|
296
|
715 if (p[0] == '2' && p[1] == '2' && p[2] == '0') {
|
|
|
716 return NGX_OK;
|
|
|
717 }
|
|
|
718 break;
|
|
290
|
719 }
|
|
|
720
|
|
296
|
721 break;
|
|
290
|
722 }
|
|
|
723
|
|
|
724 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
725
|
|
|
726 if (pcf->pass_error_message == 0) {
|
|
|
727 *(b->last - 2) = '\0';
|
|
|
728 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
|
729 "upstream sent invalid response: \"%s\"", p);
|
|
|
730 return NGX_ERROR;
|
|
|
731 }
|
|
|
732
|
|
|
733 s->out.len = b->last - p - 2;
|
|
|
734 s->out.data = p;
|
|
|
735
|
|
|
736 ngx_log_error(NGX_LOG_INFO, s->connection->log, 0,
|
|
|
737 "upstream sent invalid response: \"%V\"", &s->out);
|
|
|
738
|
|
|
739 s->out.len = b->last - b->pos;
|
|
|
740 s->out.data = b->pos;
|
|
|
741
|
|
|
742 return NGX_ERROR;
|
|
|
743 }
|
|
|
744
|
|
|
745
|
|
|
746 static void
|
|
|
747 ngx_mail_proxy_handler(ngx_event_t *ev)
|
|
|
748 {
|
|
|
749 char *action, *recv_action, *send_action;
|
|
|
750 size_t size;
|
|
|
751 ssize_t n;
|
|
|
752 ngx_buf_t *b;
|
|
|
753 ngx_uint_t do_write;
|
|
|
754 ngx_connection_t *c, *src, *dst;
|
|
|
755 ngx_mail_session_t *s;
|
|
|
756 ngx_mail_proxy_conf_t *pcf;
|
|
|
757
|
|
|
758 c = ev->data;
|
|
|
759 s = c->data;
|
|
|
760
|
|
|
761 if (ev->timedout) {
|
|
|
762 c->log->action = "proxying";
|
|
|
763
|
|
|
764 if (c == s->connection) {
|
|
|
765 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
766 "client timed out");
|
|
|
767 c->timedout = 1;
|
|
|
768
|
|
|
769 } else {
|
|
|
770 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
771 "upstream timed out");
|
|
|
772 }
|
|
|
773
|
|
|
774 ngx_mail_proxy_close_session(s);
|
|
|
775 return;
|
|
|
776 }
|
|
|
777
|
|
|
778 if (c == s->connection) {
|
|
|
779 if (ev->write) {
|
|
|
780 recv_action = "proxying and reading from upstream";
|
|
|
781 send_action = "proxying and sending to client";
|
|
|
782 src = s->proxy->upstream.connection;
|
|
|
783 dst = c;
|
|
|
784 b = s->proxy->buffer;
|
|
|
785
|
|
|
786 } else {
|
|
|
787 recv_action = "proxying and reading from client";
|
|
|
788 send_action = "proxying and sending to upstream";
|
|
|
789 src = c;
|
|
|
790 dst = s->proxy->upstream.connection;
|
|
|
791 b = s->buffer;
|
|
|
792 }
|
|
|
793
|
|
|
794 } else {
|
|
|
795 if (ev->write) {
|
|
|
796 recv_action = "proxying and reading from client";
|
|
|
797 send_action = "proxying and sending to upstream";
|
|
|
798 src = s->connection;
|
|
|
799 dst = c;
|
|
|
800 b = s->buffer;
|
|
|
801
|
|
|
802 } else {
|
|
|
803 recv_action = "proxying and reading from upstream";
|
|
|
804 send_action = "proxying and sending to client";
|
|
|
805 src = c;
|
|
|
806 dst = s->connection;
|
|
|
807 b = s->proxy->buffer;
|
|
|
808 }
|
|
|
809 }
|
|
|
810
|
|
|
811 do_write = ev->write ? 1 : 0;
|
|
|
812
|
|
|
813 ngx_log_debug3(NGX_LOG_DEBUG_MAIL, ev->log, 0,
|
|
|
814 "mail proxy handler: %d, #%d > #%d",
|
|
|
815 do_write, src->fd, dst->fd);
|
|
|
816
|
|
|
817 for ( ;; ) {
|
|
|
818
|
|
|
819 if (do_write) {
|
|
|
820
|
|
|
821 size = b->last - b->pos;
|
|
|
822
|
|
|
823 if (size && dst->write->ready) {
|
|
|
824 c->log->action = send_action;
|
|
|
825
|
|
|
826 n = dst->send(dst, b->pos, size);
|
|
|
827
|
|
|
828 if (n == NGX_ERROR) {
|
|
|
829 ngx_mail_proxy_close_session(s);
|
|
|
830 return;
|
|
|
831 }
|
|
|
832
|
|
|
833 if (n > 0) {
|
|
|
834 b->pos += n;
|
|
|
835
|
|
|
836 if (b->pos == b->last) {
|
|
|
837 b->pos = b->start;
|
|
|
838 b->last = b->start;
|
|
|
839 }
|
|
|
840 }
|
|
|
841 }
|
|
|
842 }
|
|
|
843
|
|
|
844 size = b->end - b->last;
|
|
|
845
|
|
|
846 if (size && src->read->ready) {
|
|
|
847 c->log->action = recv_action;
|
|
|
848
|
|
|
849 n = src->recv(src, b->last, size);
|
|
|
850
|
|
|
851 if (n == NGX_AGAIN || n == 0) {
|
|
|
852 break;
|
|
|
853 }
|
|
|
854
|
|
|
855 if (n > 0) {
|
|
|
856 do_write = 1;
|
|
|
857 b->last += n;
|
|
|
858
|
|
|
859 continue;
|
|
|
860 }
|
|
|
861
|
|
|
862 if (n == NGX_ERROR) {
|
|
|
863 src->read->eof = 1;
|
|
|
864 }
|
|
|
865 }
|
|
|
866
|
|
|
867 break;
|
|
|
868 }
|
|
|
869
|
|
|
870 c->log->action = "proxying";
|
|
|
871
|
|
324
|
872 if ((s->connection->read->eof && s->buffer->pos == s->buffer->last)
|
|
|
873 || (s->proxy->upstream.connection->read->eof
|
|
|
874 && s->proxy->buffer->pos == s->proxy->buffer->last)
|
|
|
875 || (s->connection->read->eof
|
|
|
876 && s->proxy->upstream.connection->read->eof))
|
|
290
|
877 {
|
|
|
878 action = c->log->action;
|
|
|
879 c->log->action = NULL;
|
|
|
880 ngx_log_error(NGX_LOG_INFO, c->log, 0, "proxied session done");
|
|
|
881 c->log->action = action;
|
|
|
882
|
|
|
883 ngx_mail_proxy_close_session(s);
|
|
|
884 return;
|
|
|
885 }
|
|
|
886
|
|
|
887 if (ngx_handle_write_event(dst->write, 0) == NGX_ERROR) {
|
|
|
888 ngx_mail_proxy_close_session(s);
|
|
|
889 return;
|
|
|
890 }
|
|
|
891
|
|
|
892 if (ngx_handle_read_event(dst->read, 0) == NGX_ERROR) {
|
|
|
893 ngx_mail_proxy_close_session(s);
|
|
|
894 return;
|
|
|
895 }
|
|
|
896
|
|
|
897 if (ngx_handle_write_event(src->write, 0) == NGX_ERROR) {
|
|
|
898 ngx_mail_proxy_close_session(s);
|
|
|
899 return;
|
|
|
900 }
|
|
|
901
|
|
|
902 if (ngx_handle_read_event(src->read, 0) == NGX_ERROR) {
|
|
|
903 ngx_mail_proxy_close_session(s);
|
|
|
904 return;
|
|
|
905 }
|
|
|
906
|
|
|
907 if (c == s->connection) {
|
|
|
908 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
909 ngx_add_timer(c->read, pcf->timeout);
|
|
|
910 }
|
|
|
911 }
|
|
|
912
|
|
|
913
|
|
|
914 static void
|
|
|
915 ngx_mail_proxy_upstream_error(ngx_mail_session_t *s)
|
|
|
916 {
|
|
|
917 if (s->proxy->upstream.connection) {
|
|
|
918 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
|
919 "close mail proxy connection: %d",
|
|
|
920 s->proxy->upstream.connection->fd);
|
|
|
921
|
|
|
922 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
923 }
|
|
|
924
|
|
|
925 if (s->out.len == 0) {
|
|
|
926 ngx_mail_session_internal_server_error(s);
|
|
|
927 return;
|
|
|
928 }
|
|
|
929
|
|
|
930 s->quit = 1;
|
|
|
931 ngx_mail_send(s->connection->write);
|
|
|
932 }
|
|
|
933
|
|
|
934
|
|
|
935 static void
|
|
|
936 ngx_mail_proxy_internal_server_error(ngx_mail_session_t *s)
|
|
|
937 {
|
|
|
938 if (s->proxy->upstream.connection) {
|
|
|
939 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
|
940 "close mail proxy connection: %d",
|
|
|
941 s->proxy->upstream.connection->fd);
|
|
|
942
|
|
|
943 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
944 }
|
|
|
945
|
|
|
946 ngx_mail_session_internal_server_error(s);
|
|
|
947 }
|
|
|
948
|
|
|
949
|
|
|
950 static void
|
|
|
951 ngx_mail_proxy_close_session(ngx_mail_session_t *s)
|
|
|
952 {
|
|
|
953 if (s->proxy->upstream.connection) {
|
|
|
954 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
|
955 "close mail proxy connection: %d",
|
|
|
956 s->proxy->upstream.connection->fd);
|
|
|
957
|
|
|
958 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
959 }
|
|
|
960
|
|
|
961 ngx_mail_close_connection(s->connection);
|
|
|
962 }
|
|
|
963
|
|
|
964
|
|
|
965 static void *
|
|
|
966 ngx_mail_proxy_create_conf(ngx_conf_t *cf)
|
|
|
967 {
|
|
|
968 ngx_mail_proxy_conf_t *pcf;
|
|
|
969
|
|
|
970 pcf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_proxy_conf_t));
|
|
|
971 if (pcf == NULL) {
|
|
|
972 return NGX_CONF_ERROR;
|
|
|
973 }
|
|
|
974
|
|
|
975 pcf->enable = NGX_CONF_UNSET;
|
|
|
976 pcf->pass_error_message = NGX_CONF_UNSET;
|
|
|
977 pcf->xclient = NGX_CONF_UNSET;
|
|
|
978 pcf->buffer_size = NGX_CONF_UNSET_SIZE;
|
|
|
979 pcf->timeout = NGX_CONF_UNSET_MSEC;
|
|
|
980
|
|
|
981 return pcf;
|
|
|
982 }
|
|
|
983
|
|
|
984
|
|
|
985 static char *
|
|
|
986 ngx_mail_proxy_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
987 {
|
|
|
988 ngx_mail_proxy_conf_t *prev = parent;
|
|
|
989 ngx_mail_proxy_conf_t *conf = child;
|
|
|
990
|
|
|
991 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
|
992 ngx_conf_merge_value(conf->pass_error_message, prev->pass_error_message, 0);
|
|
|
993 ngx_conf_merge_value(conf->xclient, prev->xclient, 1);
|
|
|
994 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size,
|
|
|
995 (size_t) ngx_pagesize);
|
|
|
996 ngx_conf_merge_msec_value(conf->timeout, prev->timeout, 24 * 60 * 60000);
|
|
|
997
|
|
|
998 return NGX_CONF_OK;
|
|
|
999 }
|
