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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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660
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4 * Copyright (C) Nginx, Inc.
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290
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11 #include <ngx_event_connect.h>
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12 #include <ngx_mail.h>
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13
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14
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15 typedef struct {
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16 ngx_flag_t enable;
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17 ngx_flag_t pass_error_message;
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18 ngx_flag_t xclient;
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19 size_t buffer_size;
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20 ngx_msec_t timeout;
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21 } ngx_mail_proxy_conf_t;
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22
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23
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24 static void ngx_mail_proxy_block_read(ngx_event_t *rev);
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25 static void ngx_mail_proxy_pop3_handler(ngx_event_t *rev);
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26 static void ngx_mail_proxy_imap_handler(ngx_event_t *rev);
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27 static void ngx_mail_proxy_smtp_handler(ngx_event_t *rev);
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28 static void ngx_mail_proxy_dummy_handler(ngx_event_t *ev);
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29 static ngx_int_t ngx_mail_proxy_read_response(ngx_mail_session_t *s,
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30 ngx_uint_t state);
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31 static void ngx_mail_proxy_handler(ngx_event_t *ev);
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32 static void ngx_mail_proxy_upstream_error(ngx_mail_session_t *s);
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33 static void ngx_mail_proxy_internal_server_error(ngx_mail_session_t *s);
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34 static void ngx_mail_proxy_close_session(ngx_mail_session_t *s);
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35 static void *ngx_mail_proxy_create_conf(ngx_conf_t *cf);
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36 static char *ngx_mail_proxy_merge_conf(ngx_conf_t *cf, void *parent,
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37 void *child);
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38
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39
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40 static ngx_command_t ngx_mail_proxy_commands[] = {
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41
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42 { ngx_string("proxy"),
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43 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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44 ngx_conf_set_flag_slot,
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45 NGX_MAIL_SRV_CONF_OFFSET,
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46 offsetof(ngx_mail_proxy_conf_t, enable),
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47 NULL },
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48
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49 { ngx_string("proxy_buffer"),
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50 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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51 ngx_conf_set_size_slot,
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52 NGX_MAIL_SRV_CONF_OFFSET,
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53 offsetof(ngx_mail_proxy_conf_t, buffer_size),
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54 NULL },
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55
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56 { ngx_string("proxy_timeout"),
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57 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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58 ngx_conf_set_msec_slot,
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59 NGX_MAIL_SRV_CONF_OFFSET,
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60 offsetof(ngx_mail_proxy_conf_t, timeout),
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61 NULL },
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62
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63 { ngx_string("proxy_pass_error_message"),
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648
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64 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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290
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65 ngx_conf_set_flag_slot,
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66 NGX_MAIL_SRV_CONF_OFFSET,
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67 offsetof(ngx_mail_proxy_conf_t, pass_error_message),
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68 NULL },
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69
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70 { ngx_string("xclient"),
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71 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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72 ngx_conf_set_flag_slot,
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73 NGX_MAIL_SRV_CONF_OFFSET,
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74 offsetof(ngx_mail_proxy_conf_t, xclient),
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75 NULL },
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76
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77 ngx_null_command
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78 };
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79
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80
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81 static ngx_mail_module_t ngx_mail_proxy_module_ctx = {
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336
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82 NULL, /* protocol */
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83
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290
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84 NULL, /* create main configuration */
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85 NULL, /* init main configuration */
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86
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87 ngx_mail_proxy_create_conf, /* create server configuration */
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88 ngx_mail_proxy_merge_conf /* merge server configuration */
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89 };
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90
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91
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92 ngx_module_t ngx_mail_proxy_module = {
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93 NGX_MODULE_V1,
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94 &ngx_mail_proxy_module_ctx, /* module context */
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95 ngx_mail_proxy_commands, /* module directives */
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96 NGX_MAIL_MODULE, /* module type */
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97 NULL, /* init master */
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98 NULL, /* init module */
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99 NULL, /* init process */
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100 NULL, /* init thread */
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101 NULL, /* exit thread */
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102 NULL, /* exit process */
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103 NULL, /* exit master */
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104 NGX_MODULE_V1_PADDING
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105 };
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106
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107
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438
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108 static u_char smtp_auth_ok[] = "235 2.0.0 OK" CRLF;
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290
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109
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110
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111 void
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540
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112 ngx_mail_proxy_init(ngx_mail_session_t *s, ngx_addr_t *peer)
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290
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113 {
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114 int keepalive;
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115 ngx_int_t rc;
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116 ngx_mail_proxy_ctx_t *p;
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117 ngx_mail_proxy_conf_t *pcf;
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118 ngx_mail_core_srv_conf_t *cscf;
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119
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120 s->connection->log->action = "connecting to upstream";
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121
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122 cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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123
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124 if (cscf->so_keepalive) {
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125 keepalive = 1;
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126
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127 if (setsockopt(s->connection->fd, SOL_SOCKET, SO_KEEPALIVE,
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128 (const void *) &keepalive, sizeof(int))
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129 == -1)
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130 {
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131 ngx_log_error(NGX_LOG_ALERT, s->connection->log, ngx_socket_errno,
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132 "setsockopt(SO_KEEPALIVE) failed");
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133 }
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134 }
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135
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136 p = ngx_pcalloc(s->connection->pool, sizeof(ngx_mail_proxy_ctx_t));
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137 if (p == NULL) {
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138 ngx_mail_session_internal_server_error(s);
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139 return;
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140 }
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141
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142 s->proxy = p;
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143
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144 p->upstream.sockaddr = peer->sockaddr;
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145 p->upstream.socklen = peer->socklen;
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146 p->upstream.name = &peer->name;
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147 p->upstream.get = ngx_event_get_peer;
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148 p->upstream.log = s->connection->log;
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149 p->upstream.log_error = NGX_ERROR_ERR;
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150
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151 rc = ngx_event_connect_peer(&p->upstream);
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152
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153 if (rc == NGX_ERROR || rc == NGX_BUSY || rc == NGX_DECLINED) {
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154 ngx_mail_proxy_internal_server_error(s);
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155 return;
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156 }
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157
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158 ngx_add_timer(p->upstream.connection->read, cscf->timeout);
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159
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160 p->upstream.connection->data = s;
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161 p->upstream.connection->pool = s->connection->pool;
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162
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163 s->connection->read->handler = ngx_mail_proxy_block_read;
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164 p->upstream.connection->write->handler = ngx_mail_proxy_dummy_handler;
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165
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166 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
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167
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168 s->proxy->buffer = ngx_create_temp_buf(s->connection->pool,
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169 pcf->buffer_size);
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170 if (s->proxy->buffer == NULL) {
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171 ngx_mail_proxy_internal_server_error(s);
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172 return;
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173 }
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174
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372
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175 s->out.len = 0;
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176
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290
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177 switch (s->protocol) {
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178
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179 case NGX_MAIL_POP3_PROTOCOL:
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180 p->upstream.connection->read->handler = ngx_mail_proxy_pop3_handler;
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181 s->mail_state = ngx_pop3_start;
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182 break;
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183
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184 case NGX_MAIL_IMAP_PROTOCOL:
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185 p->upstream.connection->read->handler = ngx_mail_proxy_imap_handler;
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186 s->mail_state = ngx_imap_start;
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187 break;
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188
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189 default: /* NGX_MAIL_SMTP_PROTOCOL */
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190 p->upstream.connection->read->handler = ngx_mail_proxy_smtp_handler;
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191 s->mail_state = ngx_smtp_start;
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192 break;
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193 }
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194 }
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195
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196
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197 static void
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198 ngx_mail_proxy_block_read(ngx_event_t *rev)
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199 {
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200 ngx_connection_t *c;
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201 ngx_mail_session_t *s;
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202
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203 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy block read");
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204
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430
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205 if (ngx_handle_read_event(rev, 0) != NGX_OK) {
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290
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206 c = rev->data;
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207 s = c->data;
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208
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209 ngx_mail_proxy_close_session(s);
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210 }
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211 }
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212
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213
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214 static void
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215 ngx_mail_proxy_pop3_handler(ngx_event_t *rev)
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216 {
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217 u_char *p;
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218 ngx_int_t rc;
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219 ngx_str_t line;
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220 ngx_connection_t *c;
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221 ngx_mail_session_t *s;
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222 ngx_mail_proxy_conf_t *pcf;
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223
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224 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
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225 "mail proxy pop3 auth handler");
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226
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227 c = rev->data;
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228 s = c->data;
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229
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230 if (rev->timedout) {
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231 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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232 "upstream timed out");
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233 c->timedout = 1;
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234 ngx_mail_proxy_internal_server_error(s);
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235 return;
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236 }
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237
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238 rc = ngx_mail_proxy_read_response(s, 0);
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239
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240 if (rc == NGX_AGAIN) {
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241 return;
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242 }
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243
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244 if (rc == NGX_ERROR) {
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245 ngx_mail_proxy_upstream_error(s);
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246 return;
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247 }
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248
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249 switch (s->mail_state) {
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250
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251 case ngx_pop3_start:
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252 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send user");
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253
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254 s->connection->log->action = "sending user name to upstream";
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255
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256 line.len = sizeof("USER ") - 1 + s->login.len + 2;
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382
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257 line.data = ngx_pnalloc(c->pool, line.len);
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290
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258 if (line.data == NULL) {
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259 ngx_mail_proxy_internal_server_error(s);
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260 return;
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261 }
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262
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263 p = ngx_cpymem(line.data, "USER ", sizeof("USER ") - 1);
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264 p = ngx_cpymem(p, s->login.data, s->login.len);
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265 *p++ = CR; *p = LF;
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266
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267 s->mail_state = ngx_pop3_user;
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268 break;
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269
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270 case ngx_pop3_user:
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271 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send pass");
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272
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273 s->connection->log->action = "sending password to upstream";
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274
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275 line.len = sizeof("PASS ") - 1 + s->passwd.len + 2;
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382
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276 line.data = ngx_pnalloc(c->pool, line.len);
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290
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277 if (line.data == NULL) {
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278 ngx_mail_proxy_internal_server_error(s);
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279 return;
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280 }
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281
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282 p = ngx_cpymem(line.data, "PASS ", sizeof("PASS ") - 1);
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283 p = ngx_cpymem(p, s->passwd.data, s->passwd.len);
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284 *p++ = CR; *p = LF;
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285
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286 s->mail_state = ngx_pop3_passwd;
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287 break;
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288
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289 case ngx_pop3_passwd:
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290 s->connection->read->handler = ngx_mail_proxy_handler;
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291 s->connection->write->handler = ngx_mail_proxy_handler;
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292 rev->handler = ngx_mail_proxy_handler;
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293 c->write->handler = ngx_mail_proxy_handler;
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294
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295 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
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296 ngx_add_timer(s->connection->read, pcf->timeout);
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297 ngx_del_timer(c->read);
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298
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299 c->log->action = NULL;
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300 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
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301
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302 ngx_mail_proxy_handler(s->connection->write);
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303
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304 return;
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305
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306 default:
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307 #if (NGX_SUPPRESS_WARN)
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570
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308 ngx_str_null(&line);
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290
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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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382
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372 line.data = ngx_pnalloc(c->pool, line.len);
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290
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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
|
|
|
390 line.len = s->login.len + 1 + 1 + NGX_SIZE_T_LEN + 1 + 2;
|
|
382
|
391 line.data = ngx_pnalloc(c->pool, line.len);
|
|
290
|
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;
|
|
382
|
411 line.data = ngx_pnalloc(c->pool, line.len);
|
|
290
|
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)
|
|
570
|
442 ngx_str_null(&line);
|
|
290
|
443 #endif
|
|
|
444 break;
|
|
|
445 }
|
|
|
446
|
|
|
447 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
|
|
|
448 /*
|
|
|
449 * we treat the incomplete sending as NGX_ERROR
|
|
|
450 * because it is very strange here
|
|
|
451 */
|
|
|
452 ngx_mail_proxy_internal_server_error(s);
|
|
|
453 return;
|
|
|
454 }
|
|
|
455
|
|
|
456 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
|
457 s->proxy->buffer->last = s->proxy->buffer->start;
|
|
|
458 }
|
|
|
459
|
|
|
460
|
|
|
461 static void
|
|
|
462 ngx_mail_proxy_smtp_handler(ngx_event_t *rev)
|
|
|
463 {
|
|
|
464 u_char *p;
|
|
|
465 ngx_int_t rc;
|
|
|
466 ngx_str_t line;
|
|
420
|
467 ngx_buf_t *b;
|
|
290
|
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;
|
|
382
|
508 line.data = ngx_pnalloc(c->pool, line.len);
|
|
290
|
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
|
|
420
|
523 if (pcf->xclient) {
|
|
|
524 s->mail_state = ngx_smtp_helo_xclient;
|
|
|
525
|
|
|
526 } else if (s->auth_method == NGX_MAIL_AUTH_NONE) {
|
|
|
527 s->mail_state = ngx_smtp_helo_from;
|
|
|
528
|
|
|
529 } else {
|
|
|
530 s->mail_state = ngx_smtp_helo;
|
|
|
531 }
|
|
290
|
532
|
|
|
533 break;
|
|
|
534
|
|
420
|
535 case ngx_smtp_helo_xclient:
|
|
290
|
536 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
|
537 "mail proxy send xclient");
|
|
|
538
|
|
|
539 s->connection->log->action = "sending XCLIENT to upstream";
|
|
|
540
|
|
444
|
541 line.len = sizeof("XCLIENT ADDR= LOGIN= NAME="
|
|
366
|
542 CRLF) - 1
|
|
|
543 + s->connection->addr_text.len + s->login.len + s->host.len;
|
|
290
|
544
|
|
382
|
545 line.data = ngx_pnalloc(c->pool, line.len);
|
|
290
|
546 if (line.data == NULL) {
|
|
|
547 ngx_mail_proxy_internal_server_error(s);
|
|
|
548 return;
|
|
|
549 }
|
|
|
550
|
|
420
|
551 line.len = ngx_sprintf(line.data,
|
|
444
|
552 "XCLIENT ADDR=%V%s%V NAME=%V" CRLF,
|
|
420
|
553 &s->connection->addr_text,
|
|
|
554 (s->login.len ? " LOGIN=" : ""), &s->login, &s->host)
|
|
|
555 - line.data;
|
|
|
556
|
|
444
|
557 if (s->smtp_helo.len) {
|
|
|
558 s->mail_state = ngx_smtp_xclient_helo;
|
|
|
559
|
|
|
560 } else if (s->auth_method == NGX_MAIL_AUTH_NONE) {
|
|
|
561 s->mail_state = ngx_smtp_xclient_from;
|
|
|
562
|
|
|
563 } else {
|
|
|
564 s->mail_state = ngx_smtp_xclient;
|
|
|
565 }
|
|
|
566
|
|
|
567 break;
|
|
|
568
|
|
|
569 case ngx_smtp_xclient_helo:
|
|
|
570 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
|
571 "mail proxy send client ehlo");
|
|
|
572
|
|
|
573 s->connection->log->action = "sending client HELO/EHLO to upstream";
|
|
|
574
|
|
|
575 line.len = sizeof("HELO " CRLF) - 1 + s->smtp_helo.len;
|
|
|
576
|
|
|
577 line.data = ngx_pnalloc(c->pool, line.len);
|
|
|
578 if (line.data == NULL) {
|
|
|
579 ngx_mail_proxy_internal_server_error(s);
|
|
|
580 return;
|
|
|
581 }
|
|
|
582
|
|
|
583 line.len = ngx_sprintf(line.data,
|
|
|
584 ((s->esmtp) ? "EHLO %V" CRLF : "HELO %V" CRLF),
|
|
|
585 &s->smtp_helo)
|
|
|
586 - line.data;
|
|
|
587
|
|
420
|
588 s->mail_state = (s->auth_method == NGX_MAIL_AUTH_NONE) ?
|
|
444
|
589 ngx_smtp_helo_from : ngx_smtp_helo;
|
|
420
|
590
|
|
|
591 break;
|
|
|
592
|
|
|
593 case ngx_smtp_helo_from:
|
|
|
594 case ngx_smtp_xclient_from:
|
|
|
595 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
|
596 "mail proxy send mail from");
|
|
|
597
|
|
|
598 s->connection->log->action = "sending MAIL FROM to upstream";
|
|
|
599
|
|
|
600 line.len = s->smtp_from.len + sizeof(CRLF) - 1;
|
|
|
601 line.data = ngx_pnalloc(c->pool, line.len);
|
|
|
602 if (line.data == NULL) {
|
|
|
603 ngx_mail_proxy_internal_server_error(s);
|
|
|
604 return;
|
|
290
|
605 }
|
|
|
606
|
|
420
|
607 p = ngx_cpymem(line.data, s->smtp_from.data, s->smtp_from.len);
|
|
|
608 *p++ = CR; *p = LF;
|
|
|
609
|
|
|
610 s->mail_state = ngx_smtp_from;
|
|
|
611
|
|
290
|
612 break;
|
|
|
613
|
|
420
|
614 case ngx_smtp_from:
|
|
|
615 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
|
616 "mail proxy send rcpt to");
|
|
|
617
|
|
|
618 s->connection->log->action = "sending RCPT TO to upstream";
|
|
|
619
|
|
|
620 line.len = s->smtp_to.len + sizeof(CRLF) - 1;
|
|
|
621 line.data = ngx_pnalloc(c->pool, line.len);
|
|
|
622 if (line.data == NULL) {
|
|
|
623 ngx_mail_proxy_internal_server_error(s);
|
|
|
624 return;
|
|
|
625 }
|
|
|
626
|
|
|
627 p = ngx_cpymem(line.data, s->smtp_to.data, s->smtp_to.len);
|
|
|
628 *p++ = CR; *p = LF;
|
|
290
|
629
|
|
420
|
630 s->mail_state = ngx_smtp_to;
|
|
|
631
|
|
|
632 break;
|
|
|
633
|
|
|
634 case ngx_smtp_helo:
|
|
|
635 case ngx_smtp_xclient:
|
|
|
636 case ngx_smtp_to:
|
|
290
|
637
|
|
420
|
638 b = s->proxy->buffer;
|
|
|
639
|
|
|
640 if (s->auth_method == NGX_MAIL_AUTH_NONE) {
|
|
|
641 b->pos = b->start;
|
|
|
642
|
|
|
643 } else {
|
|
438
|
644 ngx_memcpy(b->start, smtp_auth_ok, sizeof(smtp_auth_ok) - 1);
|
|
|
645 b->last = b->start + sizeof(smtp_auth_ok) - 1;
|
|
420
|
646 }
|
|
290
|
647
|
|
|
648 s->connection->read->handler = ngx_mail_proxy_handler;
|
|
|
649 s->connection->write->handler = ngx_mail_proxy_handler;
|
|
|
650 rev->handler = ngx_mail_proxy_handler;
|
|
|
651 c->write->handler = ngx_mail_proxy_handler;
|
|
|
652
|
|
|
653 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
654 ngx_add_timer(s->connection->read, pcf->timeout);
|
|
|
655 ngx_del_timer(c->read);
|
|
|
656
|
|
|
657 c->log->action = NULL;
|
|
|
658 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
|
|
|
659
|
|
|
660 ngx_mail_proxy_handler(s->connection->write);
|
|
|
661
|
|
|
662 return;
|
|
|
663
|
|
|
664 default:
|
|
|
665 #if (NGX_SUPPRESS_WARN)
|
|
570
|
666 ngx_str_null(&line);
|
|
290
|
667 #endif
|
|
|
668 break;
|
|
|
669 }
|
|
|
670
|
|
|
671 if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
|
|
|
672 /*
|
|
|
673 * we treat the incomplete sending as NGX_ERROR
|
|
|
674 * because it is very strange here
|
|
|
675 */
|
|
|
676 ngx_mail_proxy_internal_server_error(s);
|
|
|
677 return;
|
|
|
678 }
|
|
|
679
|
|
|
680 s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
|
681 s->proxy->buffer->last = s->proxy->buffer->start;
|
|
|
682 }
|
|
|
683
|
|
|
684
|
|
|
685 static void
|
|
|
686 ngx_mail_proxy_dummy_handler(ngx_event_t *wev)
|
|
|
687 {
|
|
|
688 ngx_connection_t *c;
|
|
|
689 ngx_mail_session_t *s;
|
|
|
690
|
|
|
691 ngx_log_debug0(NGX_LOG_DEBUG_MAIL, wev->log, 0, "mail proxy dummy handler");
|
|
|
692
|
|
430
|
693 if (ngx_handle_write_event(wev, 0) != NGX_OK) {
|
|
290
|
694 c = wev->data;
|
|
|
695 s = c->data;
|
|
|
696
|
|
|
697 ngx_mail_proxy_close_session(s);
|
|
|
698 }
|
|
|
699 }
|
|
|
700
|
|
|
701
|
|
|
702 static ngx_int_t
|
|
|
703 ngx_mail_proxy_read_response(ngx_mail_session_t *s, ngx_uint_t state)
|
|
|
704 {
|
|
|
705 u_char *p;
|
|
|
706 ssize_t n;
|
|
|
707 ngx_buf_t *b;
|
|
|
708 ngx_mail_proxy_conf_t *pcf;
|
|
|
709
|
|
|
710 s->connection->log->action = "reading response from upstream";
|
|
|
711
|
|
|
712 b = s->proxy->buffer;
|
|
|
713
|
|
|
714 n = s->proxy->upstream.connection->recv(s->proxy->upstream.connection,
|
|
|
715 b->last, b->end - b->last);
|
|
|
716
|
|
|
717 if (n == NGX_ERROR || n == 0) {
|
|
|
718 return NGX_ERROR;
|
|
|
719 }
|
|
|
720
|
|
|
721 if (n == NGX_AGAIN) {
|
|
|
722 return NGX_AGAIN;
|
|
|
723 }
|
|
|
724
|
|
|
725 b->last += n;
|
|
|
726
|
|
570
|
727 if (b->last - b->pos < 4) {
|
|
290
|
728 return NGX_AGAIN;
|
|
|
729 }
|
|
|
730
|
|
|
731 if (*(b->last - 2) != CR || *(b->last - 1) != LF) {
|
|
|
732 if (b->last == b->end) {
|
|
|
733 *(b->last - 1) = '\0';
|
|
|
734 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
|
735 "upstream sent too long response line: \"%s\"",
|
|
|
736 b->pos);
|
|
|
737 return NGX_ERROR;
|
|
|
738 }
|
|
|
739
|
|
|
740 return NGX_AGAIN;
|
|
|
741 }
|
|
|
742
|
|
|
743 p = b->pos;
|
|
|
744
|
|
|
745 switch (s->protocol) {
|
|
|
746
|
|
|
747 case NGX_MAIL_POP3_PROTOCOL:
|
|
|
748 if (p[0] == '+' && p[1] == 'O' && p[2] == 'K') {
|
|
|
749 return NGX_OK;
|
|
|
750 }
|
|
|
751 break;
|
|
|
752
|
|
|
753 case NGX_MAIL_IMAP_PROTOCOL:
|
|
|
754 switch (state) {
|
|
|
755
|
|
|
756 case ngx_imap_start:
|
|
|
757 if (p[0] == '*' && p[1] == ' ' && p[2] == 'O' && p[3] == 'K') {
|
|
|
758 return NGX_OK;
|
|
|
759 }
|
|
|
760 break;
|
|
|
761
|
|
|
762 case ngx_imap_login:
|
|
|
763 case ngx_imap_user:
|
|
|
764 if (p[0] == '+') {
|
|
|
765 return NGX_OK;
|
|
|
766 }
|
|
|
767 break;
|
|
|
768
|
|
|
769 case ngx_imap_passwd:
|
|
|
770 if (ngx_strncmp(p, s->tag.data, s->tag.len) == 0) {
|
|
|
771 p += s->tag.len;
|
|
|
772 if (p[0] == 'O' && p[1] == 'K') {
|
|
|
773 return NGX_OK;
|
|
|
774 }
|
|
|
775 }
|
|
|
776 break;
|
|
|
777 }
|
|
|
778
|
|
|
779 break;
|
|
|
780
|
|
|
781 default: /* NGX_MAIL_SMTP_PROTOCOL */
|
|
|
782 switch (state) {
|
|
|
783
|
|
420
|
784 case ngx_smtp_start:
|
|
|
785 if (p[0] == '2' && p[1] == '2' && p[2] == '0') {
|
|
|
786 return NGX_OK;
|
|
|
787 }
|
|
|
788 break;
|
|
|
789
|
|
290
|
790 case ngx_smtp_helo:
|
|
420
|
791 case ngx_smtp_helo_xclient:
|
|
|
792 case ngx_smtp_helo_from:
|
|
|
793 case ngx_smtp_from:
|
|
296
|
794 if (p[0] == '2' && p[1] == '5' && p[2] == '0') {
|
|
|
795 return NGX_OK;
|
|
|
796 }
|
|
|
797 break;
|
|
290
|
798
|
|
|
799 case ngx_smtp_xclient:
|
|
420
|
800 case ngx_smtp_xclient_from:
|
|
444
|
801 case ngx_smtp_xclient_helo:
|
|
420
|
802 if (p[0] == '2' && (p[1] == '2' || p[1] == '5') && p[2] == '0') {
|
|
296
|
803 return NGX_OK;
|
|
|
804 }
|
|
|
805 break;
|
|
420
|
806
|
|
|
807 case ngx_smtp_to:
|
|
|
808 return NGX_OK;
|
|
290
|
809 }
|
|
|
810
|
|
296
|
811 break;
|
|
290
|
812 }
|
|
|
813
|
|
|
814 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
815
|
|
|
816 if (pcf->pass_error_message == 0) {
|
|
|
817 *(b->last - 2) = '\0';
|
|
|
818 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
|
819 "upstream sent invalid response: \"%s\"", p);
|
|
|
820 return NGX_ERROR;
|
|
|
821 }
|
|
|
822
|
|
|
823 s->out.len = b->last - p - 2;
|
|
|
824 s->out.data = p;
|
|
|
825
|
|
|
826 ngx_log_error(NGX_LOG_INFO, s->connection->log, 0,
|
|
|
827 "upstream sent invalid response: \"%V\"", &s->out);
|
|
|
828
|
|
|
829 s->out.len = b->last - b->pos;
|
|
|
830 s->out.data = b->pos;
|
|
|
831
|
|
|
832 return NGX_ERROR;
|
|
|
833 }
|
|
|
834
|
|
|
835
|
|
|
836 static void
|
|
|
837 ngx_mail_proxy_handler(ngx_event_t *ev)
|
|
|
838 {
|
|
|
839 char *action, *recv_action, *send_action;
|
|
|
840 size_t size;
|
|
|
841 ssize_t n;
|
|
|
842 ngx_buf_t *b;
|
|
|
843 ngx_uint_t do_write;
|
|
|
844 ngx_connection_t *c, *src, *dst;
|
|
|
845 ngx_mail_session_t *s;
|
|
|
846 ngx_mail_proxy_conf_t *pcf;
|
|
|
847
|
|
|
848 c = ev->data;
|
|
|
849 s = c->data;
|
|
|
850
|
|
|
851 if (ev->timedout) {
|
|
|
852 c->log->action = "proxying";
|
|
|
853
|
|
|
854 if (c == s->connection) {
|
|
|
855 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
856 "client timed out");
|
|
|
857 c->timedout = 1;
|
|
|
858
|
|
|
859 } else {
|
|
|
860 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
861 "upstream timed out");
|
|
|
862 }
|
|
|
863
|
|
|
864 ngx_mail_proxy_close_session(s);
|
|
|
865 return;
|
|
|
866 }
|
|
|
867
|
|
|
868 if (c == s->connection) {
|
|
|
869 if (ev->write) {
|
|
|
870 recv_action = "proxying and reading from upstream";
|
|
|
871 send_action = "proxying and sending to client";
|
|
|
872 src = s->proxy->upstream.connection;
|
|
|
873 dst = c;
|
|
|
874 b = s->proxy->buffer;
|
|
|
875
|
|
|
876 } else {
|
|
|
877 recv_action = "proxying and reading from client";
|
|
|
878 send_action = "proxying and sending to upstream";
|
|
|
879 src = c;
|
|
|
880 dst = s->proxy->upstream.connection;
|
|
|
881 b = s->buffer;
|
|
|
882 }
|
|
|
883
|
|
|
884 } else {
|
|
|
885 if (ev->write) {
|
|
|
886 recv_action = "proxying and reading from client";
|
|
|
887 send_action = "proxying and sending to upstream";
|
|
|
888 src = s->connection;
|
|
|
889 dst = c;
|
|
|
890 b = s->buffer;
|
|
|
891
|
|
|
892 } else {
|
|
|
893 recv_action = "proxying and reading from upstream";
|
|
|
894 send_action = "proxying and sending to client";
|
|
|
895 src = c;
|
|
|
896 dst = s->connection;
|
|
|
897 b = s->proxy->buffer;
|
|
|
898 }
|
|
|
899 }
|
|
|
900
|
|
|
901 do_write = ev->write ? 1 : 0;
|
|
|
902
|
|
|
903 ngx_log_debug3(NGX_LOG_DEBUG_MAIL, ev->log, 0,
|
|
|
904 "mail proxy handler: %d, #%d > #%d",
|
|
|
905 do_write, src->fd, dst->fd);
|
|
|
906
|
|
|
907 for ( ;; ) {
|
|
|
908
|
|
|
909 if (do_write) {
|
|
|
910
|
|
|
911 size = b->last - b->pos;
|
|
|
912
|
|
|
913 if (size && dst->write->ready) {
|
|
|
914 c->log->action = send_action;
|
|
|
915
|
|
|
916 n = dst->send(dst, b->pos, size);
|
|
|
917
|
|
|
918 if (n == NGX_ERROR) {
|
|
|
919 ngx_mail_proxy_close_session(s);
|
|
|
920 return;
|
|
|
921 }
|
|
|
922
|
|
|
923 if (n > 0) {
|
|
|
924 b->pos += n;
|
|
|
925
|
|
|
926 if (b->pos == b->last) {
|
|
|
927 b->pos = b->start;
|
|
|
928 b->last = b->start;
|
|
|
929 }
|
|
|
930 }
|
|
|
931 }
|
|
|
932 }
|
|
|
933
|
|
|
934 size = b->end - b->last;
|
|
|
935
|
|
|
936 if (size && src->read->ready) {
|
|
|
937 c->log->action = recv_action;
|
|
|
938
|
|
|
939 n = src->recv(src, b->last, size);
|
|
|
940
|
|
|
941 if (n == NGX_AGAIN || n == 0) {
|
|
|
942 break;
|
|
|
943 }
|
|
|
944
|
|
|
945 if (n > 0) {
|
|
|
946 do_write = 1;
|
|
|
947 b->last += n;
|
|
|
948
|
|
|
949 continue;
|
|
|
950 }
|
|
|
951
|
|
|
952 if (n == NGX_ERROR) {
|
|
|
953 src->read->eof = 1;
|
|
|
954 }
|
|
|
955 }
|
|
|
956
|
|
|
957 break;
|
|
|
958 }
|
|
|
959
|
|
|
960 c->log->action = "proxying";
|
|
|
961
|
|
324
|
962 if ((s->connection->read->eof && s->buffer->pos == s->buffer->last)
|
|
|
963 || (s->proxy->upstream.connection->read->eof
|
|
|
964 && s->proxy->buffer->pos == s->proxy->buffer->last)
|
|
|
965 || (s->connection->read->eof
|
|
|
966 && s->proxy->upstream.connection->read->eof))
|
|
290
|
967 {
|
|
|
968 action = c->log->action;
|
|
|
969 c->log->action = NULL;
|
|
|
970 ngx_log_error(NGX_LOG_INFO, c->log, 0, "proxied session done");
|
|
|
971 c->log->action = action;
|
|
|
972
|
|
|
973 ngx_mail_proxy_close_session(s);
|
|
|
974 return;
|
|
|
975 }
|
|
|
976
|
|
430
|
977 if (ngx_handle_write_event(dst->write, 0) != NGX_OK) {
|
|
290
|
978 ngx_mail_proxy_close_session(s);
|
|
|
979 return;
|
|
|
980 }
|
|
|
981
|
|
430
|
982 if (ngx_handle_read_event(dst->read, 0) != NGX_OK) {
|
|
290
|
983 ngx_mail_proxy_close_session(s);
|
|
|
984 return;
|
|
|
985 }
|
|
|
986
|
|
430
|
987 if (ngx_handle_write_event(src->write, 0) != NGX_OK) {
|
|
290
|
988 ngx_mail_proxy_close_session(s);
|
|
|
989 return;
|
|
|
990 }
|
|
|
991
|
|
430
|
992 if (ngx_handle_read_event(src->read, 0) != NGX_OK) {
|
|
290
|
993 ngx_mail_proxy_close_session(s);
|
|
|
994 return;
|
|
|
995 }
|
|
|
996
|
|
|
997 if (c == s->connection) {
|
|
|
998 pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
999 ngx_add_timer(c->read, pcf->timeout);
|
|
|
1000 }
|
|
|
1001 }
|
|
|
1002
|
|
|
1003
|
|
|
1004 static void
|
|
|
1005 ngx_mail_proxy_upstream_error(ngx_mail_session_t *s)
|
|
|
1006 {
|
|
|
1007 if (s->proxy->upstream.connection) {
|
|
|
1008 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
|
1009 "close mail proxy connection: %d",
|
|
|
1010 s->proxy->upstream.connection->fd);
|
|
|
1011
|
|
|
1012 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
1013 }
|
|
|
1014
|
|
|
1015 if (s->out.len == 0) {
|
|
|
1016 ngx_mail_session_internal_server_error(s);
|
|
|
1017 return;
|
|
|
1018 }
|
|
|
1019
|
|
|
1020 s->quit = 1;
|
|
|
1021 ngx_mail_send(s->connection->write);
|
|
|
1022 }
|
|
|
1023
|
|
|
1024
|
|
|
1025 static void
|
|
|
1026 ngx_mail_proxy_internal_server_error(ngx_mail_session_t *s)
|
|
|
1027 {
|
|
|
1028 if (s->proxy->upstream.connection) {
|
|
|
1029 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
|
1030 "close mail proxy connection: %d",
|
|
|
1031 s->proxy->upstream.connection->fd);
|
|
|
1032
|
|
|
1033 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
1034 }
|
|
|
1035
|
|
|
1036 ngx_mail_session_internal_server_error(s);
|
|
|
1037 }
|
|
|
1038
|
|
|
1039
|
|
|
1040 static void
|
|
|
1041 ngx_mail_proxy_close_session(ngx_mail_session_t *s)
|
|
|
1042 {
|
|
|
1043 if (s->proxy->upstream.connection) {
|
|
|
1044 ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
|
1045 "close mail proxy connection: %d",
|
|
|
1046 s->proxy->upstream.connection->fd);
|
|
|
1047
|
|
|
1048 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
1049 }
|
|
|
1050
|
|
|
1051 ngx_mail_close_connection(s->connection);
|
|
|
1052 }
|
|
|
1053
|
|
|
1054
|
|
|
1055 static void *
|
|
|
1056 ngx_mail_proxy_create_conf(ngx_conf_t *cf)
|
|
|
1057 {
|
|
|
1058 ngx_mail_proxy_conf_t *pcf;
|
|
|
1059
|
|
|
1060 pcf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_proxy_conf_t));
|
|
|
1061 if (pcf == NULL) {
|
|
496
|
1062 return NULL;
|
|
290
|
1063 }
|
|
|
1064
|
|
|
1065 pcf->enable = NGX_CONF_UNSET;
|
|
|
1066 pcf->pass_error_message = NGX_CONF_UNSET;
|
|
|
1067 pcf->xclient = NGX_CONF_UNSET;
|
|
|
1068 pcf->buffer_size = NGX_CONF_UNSET_SIZE;
|
|
|
1069 pcf->timeout = NGX_CONF_UNSET_MSEC;
|
|
|
1070
|
|
|
1071 return pcf;
|
|
|
1072 }
|
|
|
1073
|
|
|
1074
|
|
|
1075 static char *
|
|
|
1076 ngx_mail_proxy_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
1077 {
|
|
|
1078 ngx_mail_proxy_conf_t *prev = parent;
|
|
|
1079 ngx_mail_proxy_conf_t *conf = child;
|
|
|
1080
|
|
|
1081 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
|
1082 ngx_conf_merge_value(conf->pass_error_message, prev->pass_error_message, 0);
|
|
|
1083 ngx_conf_merge_value(conf->xclient, prev->xclient, 1);
|
|
|
1084 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size,
|
|
|
1085 (size_t) ngx_pagesize);
|
|
|
1086 ngx_conf_merge_msec_value(conf->timeout, prev->timeout, 24 * 60 * 60000);
|
|
|
1087
|
|
|
1088 return NGX_CONF_OK;
|
|
|
1089 }
|
