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76
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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_imap.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_imap_proxy_conf_t;
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17
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18
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19 static void ngx_imap_proxy_block_read(ngx_event_t *rev);
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20 static void ngx_imap_proxy_imap_handler(ngx_event_t *rev);
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21 static void ngx_imap_proxy_pop3_handler(ngx_event_t *rev);
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22 static void ngx_imap_proxy_dummy_handler(ngx_event_t *ev);
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23 static ngx_int_t ngx_imap_proxy_read_response(ngx_imap_session_t *s,
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24 ngx_uint_t what);
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25 static void ngx_imap_proxy_handler(ngx_event_t *ev);
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26 static void ngx_imap_proxy_internal_server_error(ngx_imap_session_t *s);
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27 static void ngx_imap_proxy_close_session(ngx_imap_session_t *s);
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28 static void *ngx_imap_proxy_create_conf(ngx_conf_t *cf);
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29 static char *ngx_imap_proxy_merge_conf(ngx_conf_t *cf, void *parent,
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30 void *child);
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31
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32
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33 #define NGX_IMAP_WAIT_OK 0
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34 #define NGX_IMAP_WAIT_NEXT 1
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35
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36
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37 static ngx_command_t ngx_imap_proxy_commands[] = {
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38 { ngx_string("proxy"),
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39 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_FLAG,
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40 ngx_conf_set_flag_slot,
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41 NGX_IMAP_SRV_CONF_OFFSET,
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42 offsetof(ngx_imap_proxy_conf_t, enable),
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43 NULL },
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44
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45 ngx_null_command
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46 };
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47
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48
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49 static ngx_imap_module_t ngx_imap_proxy_module_ctx = {
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50 NULL, /* create main configuration */
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51 NULL, /* init main configuration */
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52
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53 ngx_imap_proxy_create_conf, /* create server configuration */
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54 ngx_imap_proxy_merge_conf /* merge server configuration */
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55 };
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56
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57
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58 ngx_module_t ngx_imap_proxy_module = {
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59 NGX_MODULE_V1,
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60 &ngx_imap_proxy_module_ctx, /* module context */
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61 ngx_imap_proxy_commands, /* module directives */
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62 NGX_IMAP_MODULE, /* module type */
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63 NULL, /* init module */
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64 NULL /* init process */
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65 };
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66
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67
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68 void
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69 ngx_imap_proxy_init(ngx_imap_session_t *s, ngx_peers_t *peers)
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70 {
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71 ngx_int_t rc;
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72 ngx_imap_proxy_ctx_t *p;
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73 ngx_imap_core_srv_conf_t *cscf;
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74
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75 p = ngx_pcalloc(s->connection->pool, sizeof(ngx_imap_proxy_ctx_t));
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76 if (p == NULL) {
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77 ngx_imap_session_internal_server_error(s);
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78 return;
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79 }
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80
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81 s->proxy = p;
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82
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83 p->upstream.peers = peers;
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84 p->upstream.log = s->connection->log;
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85 p->upstream.log_error = NGX_ERROR_ERR;
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86
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87 rc = ngx_event_connect_peer(&p->upstream);
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88
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89 if (rc == NGX_ERROR) {
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90 ngx_imap_session_internal_server_error(s);
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91 return;
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92 }
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93
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94 cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module);
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95 ngx_add_timer(p->upstream.connection->read, cscf->timeout);
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96
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97 p->upstream.connection->data = s;
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98 p->upstream.connection->pool = s->connection->pool;
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99
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100 s->connection->read->handler = ngx_imap_proxy_block_read;
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101 p->upstream.connection->write->handler = ngx_imap_proxy_dummy_handler;
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102
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103 if (s->protocol == NGX_IMAP_POP3_PROTOCOL) {
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104 p->upstream.connection->read->handler = ngx_imap_proxy_pop3_handler;
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105 s->imap_state = ngx_pop3_start;
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106
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107 } else {
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108 p->upstream.connection->read->handler = ngx_imap_proxy_imap_handler;
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109 s->imap_state = ngx_imap_start;
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110 }
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111 }
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112
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113
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114 static void
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115 ngx_imap_proxy_block_read(ngx_event_t *rev)
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116 {
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117 ngx_connection_t *c;
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118 ngx_imap_session_t *s;
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119
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120 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy block read");
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121
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122 if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
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123 c = rev->data;
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124 s = c->data;
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125
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126 ngx_imap_proxy_close_session(s);
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127 }
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128 }
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129
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130
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131 static void
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132 ngx_imap_proxy_imap_handler(ngx_event_t *rev)
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133 {
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134 u_char *p;
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135 ngx_int_t rc;
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136 ngx_str_t line;
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137 ngx_connection_t *c;
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138 ngx_imap_session_t *s;
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139 ngx_imap_core_srv_conf_t *cscf;
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140
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141 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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142 "imap proxy imap auth handler");
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143
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144 c = rev->data;
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145 s = c->data;
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146
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147 if (rev->timedout) {
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148 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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149 "upstream timed out");
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150 ngx_imap_proxy_internal_server_error(s);
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151 return;
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152 }
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153
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154 if (s->proxy->buffer == NULL) {
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155 cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module);
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156
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157 s->proxy->buffer = ngx_create_temp_buf(c->pool,
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158 cscf->proxy_buffer_size);
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159 if (s->proxy->buffer == NULL) {
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160 ngx_imap_proxy_internal_server_error(s);
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161 return;
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162 }
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163 }
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164
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165 rc = ngx_imap_proxy_read_response(s, s->imap_state == ngx_imap_start ?
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166 NGX_IMAP_WAIT_OK : NGX_IMAP_WAIT_NEXT);
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167
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168 if (rc == NGX_AGAIN) {
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169 return;
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170 }
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171
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172 if (rc == NGX_ERROR) {
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173 ngx_imap_proxy_internal_server_error(s);
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174 return;
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175 }
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176
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177 switch (s->imap_state) {
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178
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179 case ngx_imap_start:
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180 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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181 "imap proxy send login");
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182
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183 line.len = s->tag.len + sizeof("LOGIN ") - 1
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184 + 1 + NGX_SIZE_T_LEN + 1 + 2;
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185 line.data = ngx_palloc(c->pool, line.len);
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186 if (line.data == NULL) {
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187 ngx_imap_proxy_internal_server_error(s);
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188 return;
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189 }
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190
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191 line.len = ngx_sprintf(line.data, "%VLOGIN {%uz}" CRLF,
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192 &s->tag, s->login.len)
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193 - line.data;
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194
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195 s->imap_state = ngx_imap_login;
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196 break;
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197
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198 case ngx_imap_login:
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199 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy send user");
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200
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201 line.len = s->login.len + 1 + NGX_SIZE_T_LEN + 1 + 2;
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202 line.data = ngx_palloc(c->pool, line.len);
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203 if (line.data == NULL) {
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204 ngx_imap_proxy_internal_server_error(s);
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205 return;
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206 }
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207
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208 line.len = ngx_sprintf(line.data, "%V{%uz}" CRLF,
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209 &s->login, s->passwd.len)
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210 - line.data;
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211
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212 s->imap_state = ngx_imap_user;
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213 break;
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214
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215 case ngx_imap_user:
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216 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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217 "imap proxy send passwd");
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218
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219 line.len = s->passwd.len + 2;
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220 line.data = ngx_palloc(c->pool, line.len);
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221 if (line.data == NULL) {
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222 ngx_imap_proxy_internal_server_error(s);
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223 return;
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224 }
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225
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226 p = ngx_cpymem(line.data, s->passwd.data, s->passwd.len);
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227 *p++ = CR; *p = LF;
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228
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229 s->imap_state = ngx_imap_passwd;
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230 break;
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231
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232 default:
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233 #if (NGX_SUPPRESS_WARN)
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234 line.len = 0;
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235 line.data = NULL;
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236 #endif
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237 break;
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238 }
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239
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240 if (ngx_send(c, line.data, line.len) < (ssize_t) line.len) {
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241 /*
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242 * we treat the incomplete sending as NGX_ERROR
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243 * because it is very strange here
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244 */
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245 ngx_imap_proxy_internal_server_error(s);
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246 return;
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247 }
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248
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249 s->proxy->buffer->pos = s->proxy->buffer->start;
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250 s->proxy->buffer->last = s->proxy->buffer->start;
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251
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252 if (s->imap_state == ngx_imap_passwd) {
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253 s->connection->read->handler = ngx_imap_proxy_handler;
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254 s->connection->write->handler = ngx_imap_proxy_handler;
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255 rev->handler = ngx_imap_proxy_handler;
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256 c->write->handler = ngx_imap_proxy_handler;
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257 }
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258 }
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259
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260
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261 static void
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262 ngx_imap_proxy_pop3_handler(ngx_event_t *rev)
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263 {
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264 u_char *p;
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265 ngx_int_t rc;
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266 ngx_str_t line;
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267 ngx_connection_t *c;
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268 ngx_imap_session_t *s;
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269 ngx_imap_core_srv_conf_t *cscf;
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270
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271 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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272 "imap proxy pop3 auth handler");
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273
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274 c = rev->data;
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275 s = c->data;
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276
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277 if (rev->timedout) {
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278 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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279 "upstream timed out");
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280 ngx_imap_proxy_internal_server_error(s);
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281 return;
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282 }
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283
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284 if (s->proxy->buffer == NULL) {
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285 cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module);
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286
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287 s->proxy->buffer = ngx_create_temp_buf(c->pool,
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288 cscf->proxy_buffer_size);
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289 if (s->proxy->buffer == NULL) {
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290 ngx_imap_proxy_internal_server_error(s);
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291 return;
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292 }
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293 }
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294
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295 rc = ngx_imap_proxy_read_response(s, NGX_IMAP_WAIT_OK);
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296
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297 if (rc == NGX_AGAIN) {
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298 return;
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299 }
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300
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301 if (rc == NGX_ERROR) {
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302 ngx_imap_proxy_internal_server_error(s);
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303 return;
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304 }
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305
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306 switch (s->imap_state) {
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307
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308 case ngx_pop3_start:
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309 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy send user");
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310
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311 line.len = sizeof("USER ") - 1 + s->login.len + 2;
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312 line.data = ngx_palloc(c->pool, line.len);
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313 if (line.data == NULL) {
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314 ngx_imap_proxy_internal_server_error(s);
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315 return;
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316 }
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317
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318 p = ngx_cpymem(line.data, "USER ", sizeof("USER ") - 1);
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319 p = ngx_cpymem(p, s->login.data, s->login.len);
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320 *p++ = CR; *p = LF;
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321
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322 s->imap_state = ngx_pop3_user;
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323 break;
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324
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325 case ngx_pop3_user:
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326 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0, "imap proxy send pass");
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327
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328 line.len = sizeof("PASS ") - 1 + s->passwd.len + 2;
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329 line.data = ngx_palloc(c->pool, line.len);
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330 if (line.data == NULL) {
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331 ngx_imap_proxy_internal_server_error(s);
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332 return;
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333 }
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334
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335 p = ngx_cpymem(line.data, "PASS ", sizeof("PASS ") - 1);
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336 p = ngx_cpymem(p, s->passwd.data, s->passwd.len);
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337 *p++ = CR; *p = LF;
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338
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339 s->imap_state = ngx_pop3_passwd;
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340 break;
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341
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342 default:
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343 #if (NGX_SUPPRESS_WARN)
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344 line.len = 0;
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345 line.data = NULL;
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346 #endif
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347 break;
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348 }
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349
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350 if (ngx_send(c, line.data, line.len) < (ssize_t) line.len) {
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351 /*
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352 * we treat the incomplete sending as NGX_ERROR
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353 * because it is very strange here
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354 */
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355 ngx_imap_proxy_internal_server_error(s);
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356 return;
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357 }
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358
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359 s->proxy->buffer->pos = s->proxy->buffer->start;
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360 s->proxy->buffer->last = s->proxy->buffer->start;
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361
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362 if (s->imap_state == ngx_pop3_passwd) {
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363 s->connection->read->handler = ngx_imap_proxy_handler;
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364 s->connection->write->handler = ngx_imap_proxy_handler;
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365 rev->handler = ngx_imap_proxy_handler;
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366 c->write->handler = ngx_imap_proxy_handler;
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367 }
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368 }
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369
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370
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371 static void
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372 ngx_imap_proxy_dummy_handler(ngx_event_t *ev)
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373 {
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374 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, ev->log, 0, "imap proxy dummy handler");
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375 }
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376
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377
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378 static ngx_int_t
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379 ngx_imap_proxy_read_response(ngx_imap_session_t *s, ngx_uint_t what)
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380 {
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381 u_char *p;
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382 ssize_t n;
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383 ngx_buf_t *b;
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384
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385 b = s->proxy->buffer;
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386
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387 n = ngx_recv(s->proxy->upstream.connection, b->last, b->end - b->last);
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388
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389 if (n == NGX_ERROR || n == 0) {
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390 return NGX_ERROR;
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391 }
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392
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393 if (n == NGX_AGAIN) {
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394 return NGX_AGAIN;
|
|
|
395 }
|
|
|
396
|
|
|
397 b->last += n;
|
|
|
398
|
|
|
399 if (b->last - b->pos < 5) {
|
|
|
400 return NGX_AGAIN;
|
|
|
401 }
|
|
|
402
|
|
|
403 if (*(b->last - 2) != CR || *(b->last - 1) != LF) {
|
|
|
404 if (b->last == b->end) {
|
|
|
405 *(b->last - 1) = '\0';
|
|
|
406 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
|
407 "upstream sent too long response line: \"%s\"",
|
|
|
408 b->pos);
|
|
|
409 return NGX_IMAP_PROXY_INVALID;
|
|
|
410 }
|
|
|
411
|
|
|
412 return NGX_AGAIN;
|
|
|
413 }
|
|
|
414
|
|
|
415 p = b->pos;
|
|
|
416
|
|
|
417 if (s->protocol == NGX_IMAP_POP3_PROTOCOL) {
|
|
|
418 if (p[0] == '+' && p[1] == 'O' && p[2] == 'K') {
|
|
|
419 return NGX_OK;
|
|
|
420 }
|
|
|
421
|
|
|
422 if (p[0] == '-' && p[1] == 'E' && p[2] == 'R' && p[3] == 'R') {
|
|
|
423 return NGX_IMAP_PROXY_ERROR;
|
|
|
424 }
|
|
|
425
|
|
|
426 } else {
|
|
|
427 if (what == NGX_IMAP_WAIT_OK) {
|
|
|
428 if (p[0] == '*' && p[1] == ' ' && p[2] == 'O' && p[3] == 'K') {
|
|
|
429 return NGX_OK;
|
|
|
430 }
|
|
|
431
|
|
|
432 } else {
|
|
|
433 if (p[0] == '+' && p[1] == ' ' && p[2] == 'O' && p[3] == 'K') {
|
|
|
434 return NGX_OK;
|
|
|
435 }
|
|
|
436 }
|
|
|
437 }
|
|
|
438
|
|
|
439 *(b->last - 2) = '\0';
|
|
|
440 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
|
441 "upstream sent invalid response: \"%s\"", p);
|
|
|
442
|
|
|
443 return NGX_IMAP_PROXY_INVALID;
|
|
|
444 }
|
|
|
445
|
|
|
446
|
|
|
447 static void
|
|
|
448 ngx_imap_proxy_handler(ngx_event_t *ev)
|
|
|
449 {
|
|
|
450 size_t size;
|
|
|
451 ssize_t n;
|
|
|
452 ngx_buf_t *b;
|
|
|
453 ngx_uint_t again, do_write;
|
|
|
454 ngx_connection_t *c, *src, *dst;
|
|
|
455 ngx_imap_session_t *s;
|
|
|
456
|
|
|
457 c = ev->data;
|
|
|
458 s = c->data;
|
|
|
459
|
|
|
460 if (ev->timedout) {
|
|
|
461 if (c == s->connection) {
|
|
|
462 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
463 "client timed out");
|
|
|
464 } else {
|
|
|
465 ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
|
466 "upstream timed out");
|
|
|
467 }
|
|
|
468
|
|
|
469 ngx_imap_proxy_close_session(s);
|
|
|
470 return;
|
|
|
471 }
|
|
|
472
|
|
|
473 if (c == s->connection) {
|
|
|
474 if (ev->write) {
|
|
|
475 src = s->proxy->upstream.connection;
|
|
|
476 dst = c;
|
|
|
477 b = s->proxy->buffer;
|
|
|
478
|
|
|
479 } else {
|
|
|
480 src = c;
|
|
|
481 dst = s->proxy->upstream.connection;
|
|
|
482 b = s->buffer;
|
|
|
483 }
|
|
|
484
|
|
|
485 } else {
|
|
|
486 if (ev->write) {
|
|
|
487 src = s->connection;
|
|
|
488 dst = c;
|
|
|
489 b = s->buffer;
|
|
|
490
|
|
|
491 } else {
|
|
|
492 src = c;
|
|
|
493 dst = s->connection;
|
|
|
494 b = s->proxy->buffer;
|
|
|
495 }
|
|
|
496 }
|
|
|
497
|
|
|
498 do_write = ev->write ? 1 : 0;
|
|
|
499
|
|
|
500 ngx_log_debug3(NGX_LOG_DEBUG_IMAP, ev->log, 0,
|
|
|
501 "imap proxy handler: %d, #%d > #%d",
|
|
|
502 do_write, src->fd, dst->fd);
|
|
|
503
|
|
|
504 do {
|
|
|
505 again = 0;
|
|
|
506
|
|
|
507 if (do_write == 1) {
|
|
|
508
|
|
|
509 size = b->last - b->pos;
|
|
|
510
|
|
|
511 if (size && dst->write->ready) {
|
|
|
512 n = ngx_send(dst, b->pos, size);
|
|
|
513
|
|
|
514 if (n == NGX_ERROR) {
|
|
|
515 ngx_imap_proxy_close_session(s);
|
|
|
516 return;
|
|
|
517 }
|
|
|
518
|
|
|
519 if (n > 0) {
|
|
|
520 again = 1;
|
|
|
521 b->pos += n;
|
|
|
522
|
|
|
523 if (b->pos == b->last) {
|
|
|
524 b->pos = b->start;
|
|
|
525 b->last = b->start;
|
|
|
526 }
|
|
|
527 }
|
|
|
528
|
|
|
529 if (n == NGX_AGAIN || n < (ssize_t) size) {
|
|
|
530 if (ngx_handle_write_event(dst->write, /* TODO: LOWAT */ 0)
|
|
|
531 == NGX_ERROR)
|
|
|
532 {
|
|
|
533 ngx_imap_proxy_close_session(s);
|
|
|
534 return;
|
|
|
535 }
|
|
|
536 }
|
|
|
537 }
|
|
|
538 }
|
|
|
539
|
|
|
540 size = b->end - b->last;
|
|
|
541
|
|
|
542 if (size && src->read->ready) {
|
|
|
543 n = ngx_recv(src, b->last, size);
|
|
|
544
|
|
|
545 if (n == NGX_ERROR || n == 0) {
|
|
|
546 ngx_imap_proxy_close_session(s);
|
|
|
547 return;
|
|
|
548 }
|
|
|
549
|
|
|
550 if (n > 0) {
|
|
|
551 again = 1;
|
|
|
552 do_write = 1;
|
|
|
553 b->last += n;
|
|
|
554 }
|
|
|
555
|
|
|
556 if (n == NGX_AGAIN || n < (ssize_t) size) {
|
|
|
557 if (ngx_handle_read_event(src->read, 0) == NGX_ERROR) {
|
|
|
558 ngx_imap_proxy_close_session(s);
|
|
|
559 return;
|
|
|
560 }
|
|
|
561 }
|
|
|
562 }
|
|
|
563
|
|
|
564 } while (again);
|
|
|
565 }
|
|
|
566
|
|
|
567
|
|
|
568 static void
|
|
|
569 ngx_imap_proxy_internal_server_error(ngx_imap_session_t *s)
|
|
|
570 {
|
|
|
571 if (s->proxy->upstream.connection) {
|
|
|
572 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, s->connection->log, 0,
|
|
|
573 "close imap proxy connection: %d",
|
|
|
574 s->proxy->upstream.connection->fd);
|
|
|
575
|
|
|
576 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
577 }
|
|
|
578
|
|
|
579 ngx_imap_session_internal_server_error(s);
|
|
|
580 }
|
|
|
581
|
|
|
582
|
|
|
583 static void
|
|
|
584 ngx_imap_proxy_close_session(ngx_imap_session_t *s)
|
|
|
585 {
|
|
|
586 if (s->proxy->upstream.connection) {
|
|
|
587 ngx_log_debug1(NGX_LOG_DEBUG_IMAP, s->connection->log, 0,
|
|
|
588 "close imap proxy connection: %d",
|
|
|
589 s->proxy->upstream.connection->fd);
|
|
|
590
|
|
|
591 ngx_close_connection(s->proxy->upstream.connection);
|
|
|
592 }
|
|
|
593
|
|
|
594 ngx_imap_close_connection(s->connection);
|
|
|
595 }
|
|
|
596
|
|
|
597
|
|
|
598 static void *
|
|
|
599 ngx_imap_proxy_create_conf(ngx_conf_t *cf)
|
|
|
600 {
|
|
|
601 ngx_imap_proxy_conf_t *pcf;
|
|
|
602
|
|
|
603 pcf = ngx_pcalloc(cf->pool, sizeof(ngx_imap_proxy_conf_t));
|
|
|
604 if (pcf == NULL) {
|
|
|
605 return NGX_CONF_ERROR;
|
|
|
606 }
|
|
|
607
|
|
|
608 pcf->enable = NGX_CONF_UNSET;
|
|
|
609
|
|
|
610 return pcf;
|
|
|
611 }
|
|
|
612
|
|
|
613
|
|
|
614 static char *
|
|
|
615 ngx_imap_proxy_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
616 {
|
|
|
617 ngx_imap_proxy_conf_t *prev = parent;
|
|
|
618 ngx_imap_proxy_conf_t *conf = child;
|
|
|
619
|
|
|
620 ngx_conf_merge_msec_value(conf->enable, prev->enable, 0);
|
|
|
621
|
|
|
622 return NGX_CONF_OK;
|
|
|
623 }
|
