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521
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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_peers_t *peers;
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16
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17 ngx_msec_t timeout;
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18
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19 ngx_str_t host_header;
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20 ngx_str_t uri;
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21 } ngx_imap_auth_http_conf_t;
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22
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23
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24 typedef struct {
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25 ngx_buf_t *request;
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525
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26 ngx_buf_t *response;
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521
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27 ngx_peer_connection_t peer;
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28 } ngx_imap_auth_http_ctx_t;
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29
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30
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31 static void ngx_imap_auth_http_write_handler(ngx_event_t *wev);
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32 static void ngx_imap_auth_http_read_handler(ngx_event_t *rev);
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33 static void ngx_imap_auth_http_block_read(ngx_event_t *rev);
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34 static void ngx_imap_auth_http_dummy_handler(ngx_event_t *ev);
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35 static ngx_buf_t *ngx_imap_auth_http_create_request(ngx_imap_session_t *s,
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36 ngx_imap_auth_http_conf_t *ahcf);
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37
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38 static void *ngx_imap_auth_http_create_conf(ngx_conf_t *cf);
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39 static char *ngx_imap_auth_http_merge_conf(ngx_conf_t *cf, void *parent,
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40 void *child);
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41 static char *ngx_imap_auth_http(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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42
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43
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44 static ngx_command_t ngx_imap_auth_http_commands[] = {
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45
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46 { ngx_string("auth_http"),
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47 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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48 ngx_imap_auth_http,
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49 NGX_IMAP_SRV_CONF_OFFSET,
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50 0,
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51 NULL },
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52
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53 { ngx_string("auth_http_timeout"),
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54 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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55 ngx_conf_set_msec_slot,
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56 NGX_IMAP_SRV_CONF_OFFSET,
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57 offsetof(ngx_imap_auth_http_conf_t, timeout),
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58 NULL },
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59
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60 ngx_null_command
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61 };
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62
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63
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64 static ngx_imap_module_t ngx_imap_auth_http_module_ctx = {
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65 NULL, /* create main configuration */
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66 NULL, /* init main configuration */
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67
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68 ngx_imap_auth_http_create_conf, /* create server configuration */
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69 ngx_imap_auth_http_merge_conf /* merge server configuration */
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70 };
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71
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72
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73 ngx_module_t ngx_imap_auth_http_module = {
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74 NGX_MODULE_V1,
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75 &ngx_imap_auth_http_module_ctx, /* module context */
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76 ngx_imap_auth_http_commands, /* module directives */
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77 NGX_IMAP_MODULE, /* module type */
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78 NULL, /* init module */
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79 NULL /* init process */
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80 };
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81
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82
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83 static char *ngx_imap_auth_http_protocol[] = { "pop3", "imap" };
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84
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85
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86 void
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87 ngx_imap_auth_http_init(ngx_imap_session_t *s)
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88 {
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89 ngx_int_t rc;
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90 ngx_imap_auth_http_ctx_t *ctx;
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91 ngx_imap_auth_http_conf_t *ahcf;
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92
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93 ctx = ngx_pcalloc(s->connection->pool, sizeof(ngx_imap_auth_http_ctx_t));
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94 if (ctx == NULL) {
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525
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95 ngx_imap_session_internal_server_error(s);
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521
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96 return;
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97 }
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98
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99 ahcf = ngx_imap_get_module_srv_conf(s, ngx_imap_auth_http_module);
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100
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101 ctx->request = ngx_imap_auth_http_create_request(s, ahcf);
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102 if (ctx->request == NULL) {
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525
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103 ngx_imap_session_internal_server_error(s);
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521
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104 return;
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105 }
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106
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107 ngx_imap_set_ctx(s, ctx, ngx_imap_auth_http_module);
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108
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109 ctx->peer.peers = ahcf->peers;
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110 ctx->peer.log = s->connection->log;
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111 ctx->peer.log_error = NGX_ERROR_ERR;
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112
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113 rc = ngx_event_connect_peer(&ctx->peer);
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114
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115 if (rc == NGX_ERROR) {
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525
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116 ngx_imap_session_internal_server_error(s);
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521
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117 return;
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118 }
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119
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120 ctx->peer.connection->data = s;
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121 ctx->peer.connection->pool = s->connection->pool;
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122
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123 s->connection->read->handler = ngx_imap_auth_http_block_read;
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124 ctx->peer.connection->read->handler = ngx_imap_auth_http_read_handler;
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125 ctx->peer.connection->write->handler = ngx_imap_auth_http_write_handler;
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126
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127 if (rc == NGX_OK) {
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128 ngx_imap_auth_http_write_handler(ctx->peer.connection->write);
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129 return;
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130 }
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131
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132 ngx_add_timer(ctx->peer.connection->read, ahcf->timeout);
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133 ngx_add_timer(ctx->peer.connection->write, ahcf->timeout);
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134 }
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135
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136
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137 static void
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138 ngx_imap_auth_http_write_handler(ngx_event_t *wev)
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139 {
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140 ssize_t n, size;
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141 ngx_connection_t *c;
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142 ngx_imap_session_t *s;
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143 ngx_imap_auth_http_ctx_t *ctx;
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144 ngx_imap_auth_http_conf_t *ahcf;
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145
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146 c = wev->data;
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147 s = c->data;
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148
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149 ctx = ngx_imap_get_module_ctx(s, ngx_imap_auth_http_module);
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150
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151 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, wev->log, 0,
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152 "imap auth http write handler");
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153
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154 if (wev->timedout) {
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155 ngx_log_error(NGX_LOG_ERR, wev->log, NGX_ETIMEDOUT,
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156 "auth http server timed out");
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525
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157 ngx_close_connection(ctx->peer.connection);
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158 ngx_imap_session_internal_server_error(s);
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521
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159 return;
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160 }
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161
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162 size = ctx->request->last - ctx->request->pos;
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163
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164 n = ngx_send(c, ctx->request->pos, size);
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165
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166 if (n == NGX_ERROR) {
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525
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167 ngx_close_connection(ctx->peer.connection);
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168 ngx_imap_session_internal_server_error(s);
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521
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169 return;
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170 }
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171
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172 if (n > 0) {
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173 ctx->request->pos += n;
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174
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175 if (n == size) {
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176 wev->handler = ngx_imap_auth_http_dummy_handler;
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177
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178 if (wev->timer_set) {
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179 ngx_del_timer(wev);
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180 }
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181
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182 return;
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183 }
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184 }
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185
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186 if (!wev->timer_set) {
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187 ahcf = ngx_imap_get_module_srv_conf(s, ngx_imap_auth_http_module);
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188 ngx_add_timer(wev, ahcf->timeout);
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189 }
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190 }
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191
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192
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193 static void
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194 ngx_imap_auth_http_read_handler(ngx_event_t *rev)
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195 {
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525
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196 ssize_t n, size;
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521
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197 ngx_peers_t *peers;
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198 ngx_connection_t *c;
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199 ngx_imap_session_t *s;
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200 ngx_imap_auth_http_ctx_t *ctx;
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201
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202 c = rev->data;
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203 s = c->data;
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204
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205 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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206 "imap auth http read handler");
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207
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525
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208 ctx = ngx_imap_get_module_ctx(s, ngx_imap_auth_http_module);
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209
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210 if (rev->timedout) {
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211 ngx_log_error(NGX_LOG_ERR, rev->log, NGX_ETIMEDOUT,
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212 "auth http server timed out");
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213 ngx_close_connection(ctx->peer.connection);
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214 ngx_imap_session_internal_server_error(s);
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215 return;
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216 }
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217
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218 if (ctx->response == NULL) {
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219 ctx->response = ngx_create_temp_buf(s->connection->pool, 1024);
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220 if (ctx->response == NULL) {
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221 ngx_close_connection(ctx->peer.connection);
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222 ngx_imap_session_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
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227 size = ctx->response->last - ctx->response->pos;
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228
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229 n = ngx_recv(c, ctx->response->pos, size);
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230
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231 if (n == NGX_ERROR || n == 0) {
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232 ngx_close_connection(ctx->peer.connection);
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233 ngx_imap_session_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
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238
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239
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240
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241
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521
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242 peers = NULL;
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243
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244 ngx_imap_proxy_init(s, peers);
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245 }
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246
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247
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248 static void
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249 ngx_imap_auth_http_block_read(ngx_event_t *rev)
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250 {
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251 ngx_connection_t *c;
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252 ngx_imap_session_t *s;
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253 ngx_imap_auth_http_ctx_t *ctx;
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254
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255 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, rev->log, 0,
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256 "imap auth http block read");
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257
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258 if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {
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259 c = rev->data;
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260 s = c->data;
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261
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262 ctx = ngx_imap_get_module_ctx(s, ngx_imap_auth_http_module);
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263
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525
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264 ngx_close_connection(ctx->peer.connection);
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265 ngx_imap_session_internal_server_error(s);
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521
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266 }
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267 }
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268
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269
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270 static void
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271 ngx_imap_auth_http_dummy_handler(ngx_event_t *ev)
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272 {
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273 ngx_log_debug0(NGX_LOG_DEBUG_IMAP, ev->log, 0,
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274 "imap auth http dummy handler");
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275 }
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276
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277
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278 static ngx_buf_t *
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279 ngx_imap_auth_http_create_request(ngx_imap_session_t *s,
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280 ngx_imap_auth_http_conf_t *ahcf)
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281 {
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282 size_t len;
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283 ngx_buf_t *b;
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284
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285 len = sizeof("GET ") - 1 + ahcf->uri.len + sizeof(" HTTP/1.0" CRLF) - 1
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286 + sizeof("Host: ") - 1 + ahcf->host_header.len + sizeof(CRLF) - 1
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287 + sizeof("Auth-Method: plain" CRLF) - 1
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288 + sizeof("Auth-User: ") - 1 + s->login.len + sizeof(CRLF) - 1
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289 + sizeof("Auth-Pass: ") - 1 + s->passwd.len + sizeof(CRLF) - 1
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290 + sizeof("Auth-Protocol: imap" CRLF) - 1
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291 + sizeof("Client-IP: ") - 1 + s->connection->addr_text.len
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292 + sizeof(CRLF) - 1
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293 + sizeof(CRLF) - 1;
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294
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295 b = ngx_create_temp_buf(s->connection->pool, len);
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296 if (b == NULL) {
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297 return NULL;
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298 }
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299
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300 b->last = ngx_cpymem(b->last, "GET ", sizeof("GET ") - 1);
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301 b->last = ngx_cpymem(b->last, ahcf->uri.data, ahcf->uri.len);
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302 b->last = ngx_cpymem(b->last, " HTTP/1.0" CRLF,
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303 sizeof(" HTTP/1.0" CRLF) - 1);
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304
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305 b->last = ngx_cpymem(b->last, "Host: ", sizeof("Host: ") - 1);
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306 b->last = ngx_cpymem(b->last, ahcf->host_header.data,
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307 ahcf->host_header.len);
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308 *b->last++ = CR; *b->last++ = LF;
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309
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310 b->last = ngx_cpymem(b->last, "Auth-Method: plain" CRLF,
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311 sizeof("Auth-Method: plain" CRLF) - 1);
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312
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313 b->last = ngx_cpymem(b->last, "Auth-User: ", sizeof("Auth-User: ") - 1);
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314 b->last = ngx_cpymem(b->last, s->login.data, s->login.len);
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315 *b->last++ = CR; *b->last++ = LF;
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316
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317 b->last = ngx_cpymem(b->last, "Auth-Pass: ", sizeof("Auth-Pass: ") - 1);
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318 b->last = ngx_cpymem(b->last, s->passwd.data, s->passwd.len);
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319 *b->last++ = CR; *b->last++ = LF;
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320
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321 b->last = ngx_cpymem(b->last, "Auth-Protocol: ",
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322 sizeof("Auth-Protocol: ") - 1);
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323 b->last = ngx_cpymem(b->last, ngx_imap_auth_http_protocol[s->protocol],
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324 sizeof("imap") - 1);
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325 *b->last++ = CR; *b->last++ = LF;
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326
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327 b->last = ngx_cpymem(b->last, "Client-IP: ", sizeof("Client-IP: ") - 1);
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328 b->last = ngx_cpymem(b->last, s->connection->addr_text.data,
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329 s->connection->addr_text.len);
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330 *b->last++ = CR; *b->last++ = LF;
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331
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332 /* add "\r\n" at the header end */
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333 *b->last++ = CR; *b->last++ = LF;
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334
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335 #if (NGX_DEBUG)
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336 {
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337 ngx_str_t l;
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338
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339 l.len = b->last - b->pos;
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340 l.data = b->pos;
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341 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, s->connection->log, 0,
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342 "imap auth http header:\n\"%V\"", &l);
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343 }
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344 #endif
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345
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346 return b;
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347 }
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348
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349
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350 static void *
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351 ngx_imap_auth_http_create_conf(ngx_conf_t *cf)
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352 {
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353 ngx_imap_auth_http_conf_t *ahcf;
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354
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355 ahcf = ngx_pcalloc(cf->pool, sizeof(ngx_imap_auth_http_conf_t));
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356 if (ahcf == NULL) {
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357 return NGX_CONF_ERROR;
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358 }
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359
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360 ahcf->timeout = NGX_CONF_UNSET_MSEC;
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361
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362 return ahcf;
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363 }
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364
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365
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366 static char *
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367 ngx_imap_auth_http_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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368 {
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369 ngx_imap_auth_http_conf_t *prev = parent;
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370 ngx_imap_auth_http_conf_t *conf = child;
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371
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372 if (conf->peers == NULL) {
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373 conf->peers = prev->peers;
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374 conf->host_header = prev->host_header;
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375 conf->uri = prev->uri;
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376 }
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377
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378 ngx_conf_merge_msec_value(conf->timeout, prev->timeout, 60000);
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379
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380 return NGX_CONF_OK;
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381 }
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382
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383
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384 static char *
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385 ngx_imap_auth_http(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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386 {
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387 ngx_imap_auth_http_conf_t *ahcf = conf;
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388
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389 ngx_uint_t i;
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390 ngx_str_t *value, *url;
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391 ngx_inet_upstream_t inet_upstream;
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392 #if (NGX_HAVE_UNIX_DOMAIN)
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393 ngx_unix_domain_upstream_t unix_upstream;
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394 #endif
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395
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396 value = cf->args->elts;
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397
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398 url = &value[1];
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399
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400 if (ngx_strncasecmp(url->data, "unix:", 5) == 0) {
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401
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402 #if (NGX_HAVE_UNIX_DOMAIN)
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403
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404 ngx_memzero(&unix_upstream, sizeof(ngx_unix_domain_upstream_t));
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405
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406 unix_upstream.name = *url;
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407 unix_upstream.url = *url;
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408 unix_upstream.uri_part = 1;
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409
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410 ahcf->peers = ngx_unix_upstream_parse(cf, &unix_upstream);
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411 if (ahcf->peers == NULL) {
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412 return NGX_CONF_ERROR;
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413 }
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414
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415 ahcf->peers->peer[0].uri_separator = ":";
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416
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417 ahcf->host_header.len = sizeof("localhost") - 1;
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418 ahcf->host_header.data = (u_char *) "localhost";
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419 ahcf->uri = unix_upstream.uri;
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420
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421 #else
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422 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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423 "the unix domain sockets are not supported "
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424 "on this platform");
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425 return NGX_CONF_ERROR;
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426
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427 #endif
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428
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429 } else {
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430 ngx_memzero(&inet_upstream, sizeof(ngx_inet_upstream_t));
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431
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432 inet_upstream.name = *url;
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433 inet_upstream.url = *url;
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434 inet_upstream.default_port_value = 80;
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435 inet_upstream.uri_part = 1;
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436
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437 ahcf->peers = ngx_inet_upstream_parse(cf, &inet_upstream);
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438 if (ahcf->peers == NULL) {
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439 return NGX_CONF_ERROR;
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440 }
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441
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442 for (i = 0; i < ahcf->peers->number; i++) {
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443 ahcf->peers->peer[i].uri_separator = ":";
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444 }
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445
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446 ahcf->host_header = inet_upstream.host_header;
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447 ahcf->uri = inet_upstream.uri;
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448 }
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449
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450 return NGX_CONF_OK;
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451 }
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