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1
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2 /*
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3 * Copyright (C) Maxim Dounin
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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_http.h>
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10
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11
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12 typedef struct {
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13 ngx_str_t uri;
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14 } ngx_http_auth_request_conf_t;
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15
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16 typedef struct {
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17 ngx_uint_t done;
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18 ngx_uint_t status;
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19 ngx_http_request_t *subrequest;
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20 } ngx_http_auth_request_ctx_t;
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21
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22
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23 static ngx_int_t ngx_http_auth_request_handler(ngx_http_request_t *r);
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24 static ngx_int_t ngx_http_auth_request_done(ngx_http_request_t *r,
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25 void *data, ngx_int_t rc);
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26 static void *ngx_http_auth_request_create_conf(ngx_conf_t *cf);
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27 static char *ngx_http_auth_request_merge_conf(ngx_conf_t *cf,
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28 void *parent, void *child);
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29 static ngx_int_t ngx_http_auth_request_init(ngx_conf_t *cf);
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30
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31
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32 static ngx_command_t ngx_http_auth_request_commands[] = {
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33
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34 { ngx_string("auth_request"),
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35 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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36 ngx_conf_set_str_slot,
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37 NGX_HTTP_LOC_CONF_OFFSET,
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38 offsetof(ngx_http_auth_request_conf_t, uri),
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39 NULL },
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40
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41 ngx_null_command
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42 };
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43
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44
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45 static ngx_http_module_t ngx_http_auth_request_module_ctx = {
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46 NULL, /* preconfiguration */
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47 ngx_http_auth_request_init, /* postconfiguration */
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48
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49 NULL, /* create main configuration */
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50 NULL, /* init main configuration */
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51
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52 NULL, /* create server configuration */
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53 NULL, /* merge server configuration */
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54
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55 ngx_http_auth_request_create_conf, /* create location configuration */
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56 ngx_http_auth_request_merge_conf /* merge location configuration */
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57 };
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58
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59
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60 ngx_module_t ngx_http_auth_request_module = {
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61 NGX_MODULE_V1,
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62 &ngx_http_auth_request_module_ctx, /* module context */
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63 ngx_http_auth_request_commands, /* module directives */
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64 NGX_HTTP_MODULE, /* module type */
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65 NULL, /* init master */
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66 NULL, /* init module */
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67 NULL, /* init process */
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68 NULL, /* init thread */
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69 NULL, /* exit thread */
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70 NULL, /* exit process */
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71 NULL, /* exit master */
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72 NGX_MODULE_V1_PADDING
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73 };
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74
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75
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76 static ngx_int_t
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77 ngx_http_auth_request_handler(ngx_http_request_t *r)
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78 {
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79 ngx_table_elt_t *h, *ho;
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80 ngx_http_request_t *sr;
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81 ngx_http_post_subrequest_t *ps;
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82 ngx_http_auth_request_ctx_t *ctx;
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83 ngx_http_auth_request_conf_t *arcf;
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84
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85 arcf = ngx_http_get_module_loc_conf(r, ngx_http_auth_request_module);
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86
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87 if (arcf->uri.len == 0) {
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88 return NGX_DECLINED;
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89 }
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90
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91 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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92 "auth request handler");
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93
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94 ctx = ngx_http_get_module_ctx(r, ngx_http_auth_request_module);
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95
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96 if (ctx != NULL) {
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97 if (!ctx->done) {
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98 return NGX_AGAIN;
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99 }
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100
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101 if (ctx->status == NGX_HTTP_FORBIDDEN) {
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102 return ctx->status;
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103 }
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104
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105 if (ctx->status == NGX_HTTP_UNAUTHORIZED) {
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106 sr = ctx->subrequest;
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107
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108 h = sr->headers_out.www_authenticate;
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109
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110 if (!h && sr->upstream) {
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111 h = sr->upstream->headers_in.www_authenticate;
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112 }
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113
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114 if (h) {
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115 ho = ngx_list_push(&r->headers_out.headers);
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116 if (ho == NULL) {
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117 return NGX_ERROR;
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118 }
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119
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120 *ho = *h;
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121
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122 r->headers_out.www_authenticate = ho;
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123 }
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124
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125 return ctx->status;
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126 }
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127
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128 if (ctx->status >= NGX_HTTP_OK
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129 && ctx->status < NGX_HTTP_SPECIAL_RESPONSE)
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130 {
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131 return NGX_OK;
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132 }
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133
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134 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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135 "auth request unexpected status: %d", ctx->status);
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136
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137 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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138 }
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139
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140 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_auth_request_ctx_t));
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141 if (ctx == NULL) {
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142 return NGX_ERROR;
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143 }
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144
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145 ps = ngx_palloc(r->pool, sizeof(ngx_http_post_subrequest_t));
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146 if (ps == NULL) {
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147 return NGX_ERROR;
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148 }
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149
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150 ps->handler = ngx_http_auth_request_done;
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151 ps->data = ctx;
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152
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153 if (ngx_http_subrequest(r, &arcf->uri, NULL, &sr, ps,
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154 NGX_HTTP_SUBREQUEST_WAITED)
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155 != NGX_OK)
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156 {
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157 return NGX_ERROR;
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158 }
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159
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160 sr->header_only = 1;
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161
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162 ctx->subrequest = sr;
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163
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164 ngx_http_set_ctx(r, ctx, ngx_http_auth_request_module);
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165
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166 return NGX_AGAIN;
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167 }
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168
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169
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170 static ngx_int_t
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171 ngx_http_auth_request_done(ngx_http_request_t *r, void *data, ngx_int_t rc)
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172 {
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173 ngx_http_auth_request_ctx_t *ctx = data;
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174
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175 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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176 "auth request done s:%d", r->headers_out.status);
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177
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178 ctx->done = 1;
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179 ctx->status = r->headers_out.status;
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180
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181 return rc;
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182 }
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183
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184
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185 static void *
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186 ngx_http_auth_request_create_conf(ngx_conf_t *cf)
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187 {
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188 ngx_http_auth_request_conf_t *conf;
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189
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190 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_auth_request_conf_t));
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191 if (conf == NULL) {
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192 return NULL;
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193 }
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194
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195 /*
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196 * set by ngx_pcalloc():
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197 *
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198 * conf->uri.len = { 0, NULL };
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199 */
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200
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201 return conf;
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202 }
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203
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204
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205 static char *
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206 ngx_http_auth_request_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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207 {
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208 ngx_http_auth_request_conf_t *prev = parent;
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209 ngx_http_auth_request_conf_t *conf = child;
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210
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211 ngx_conf_merge_str_value(conf->uri, prev->uri, "");
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212
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213 return NGX_CONF_OK;
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214 }
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215
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216
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217 static ngx_int_t
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218 ngx_http_auth_request_init(ngx_conf_t *cf)
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219 {
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220 ngx_http_handler_pt *h;
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221 ngx_http_core_main_conf_t *cmcf;
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222
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223 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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224
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225 h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
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226 if (h == NULL) {
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227 return NGX_ERROR;
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228 }
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229
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230 *h = ngx_http_auth_request_handler;
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231
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232 return NGX_OK;
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233 }
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