5329
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1
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2 /*
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3 * Copyright (C) Maxim Dounin
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4 * Copyright (C) Nginx, Inc.
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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_http.h>
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11
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12
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13 typedef struct {
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14 ngx_str_t uri;
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15 ngx_array_t *vars;
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16 } ngx_http_auth_request_conf_t;
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17
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18
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19 typedef struct {
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20 ngx_uint_t done;
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21 ngx_uint_t status;
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22 ngx_http_request_t *subrequest;
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23 } ngx_http_auth_request_ctx_t;
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24
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25
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26 typedef struct {
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27 ngx_int_t index;
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28 ngx_http_complex_value_t value;
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29 ngx_http_set_variable_pt set_handler;
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30 } ngx_http_auth_request_variable_t;
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31
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32
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33 static ngx_int_t ngx_http_auth_request_handler(ngx_http_request_t *r);
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34 static ngx_int_t ngx_http_auth_request_done(ngx_http_request_t *r,
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35 void *data, ngx_int_t rc);
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36 static ngx_int_t ngx_http_auth_request_set_variables(ngx_http_request_t *r,
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37 ngx_http_auth_request_conf_t *arcf, ngx_http_auth_request_ctx_t *ctx);
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38 static ngx_int_t ngx_http_auth_request_variable(ngx_http_request_t *r,
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39 ngx_http_variable_value_t *v, uintptr_t data);
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40 static void *ngx_http_auth_request_create_conf(ngx_conf_t *cf);
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41 static char *ngx_http_auth_request_merge_conf(ngx_conf_t *cf,
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42 void *parent, void *child);
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43 static ngx_int_t ngx_http_auth_request_init(ngx_conf_t *cf);
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44 static char *ngx_http_auth_request(ngx_conf_t *cf, ngx_command_t *cmd,
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45 void *conf);
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46 static char *ngx_http_auth_request_set(ngx_conf_t *cf, ngx_command_t *cmd,
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47 void *conf);
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48
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49
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50 static ngx_command_t ngx_http_auth_request_commands[] = {
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51
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52 { ngx_string("auth_request"),
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53 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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54 ngx_http_auth_request,
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55 NGX_HTTP_LOC_CONF_OFFSET,
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56 0,
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57 NULL },
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58
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59 { ngx_string("auth_request_set"),
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60 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
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61 ngx_http_auth_request_set,
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62 NGX_HTTP_LOC_CONF_OFFSET,
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63 0,
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64 NULL },
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65
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66 ngx_null_command
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67 };
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68
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69
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70 static ngx_http_module_t ngx_http_auth_request_module_ctx = {
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71 NULL, /* preconfiguration */
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72 ngx_http_auth_request_init, /* postconfiguration */
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73
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74 NULL, /* create main configuration */
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75 NULL, /* init main configuration */
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76
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77 NULL, /* create server configuration */
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78 NULL, /* merge server configuration */
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79
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80 ngx_http_auth_request_create_conf, /* create location configuration */
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81 ngx_http_auth_request_merge_conf /* merge location configuration */
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82 };
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83
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84
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85 ngx_module_t ngx_http_auth_request_module = {
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86 NGX_MODULE_V1,
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87 &ngx_http_auth_request_module_ctx, /* module context */
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88 ngx_http_auth_request_commands, /* module directives */
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89 NGX_HTTP_MODULE, /* module type */
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90 NULL, /* init master */
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91 NULL, /* init module */
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92 NULL, /* init process */
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93 NULL, /* init thread */
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94 NULL, /* exit thread */
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95 NULL, /* exit process */
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96 NULL, /* exit master */
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97 NGX_MODULE_V1_PADDING
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98 };
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99
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100
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101 static ngx_int_t
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102 ngx_http_auth_request_handler(ngx_http_request_t *r)
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103 {
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104 ngx_table_elt_t *h, *ho;
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105 ngx_http_request_t *sr;
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106 ngx_http_post_subrequest_t *ps;
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107 ngx_http_auth_request_ctx_t *ctx;
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108 ngx_http_auth_request_conf_t *arcf;
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109
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110 arcf = ngx_http_get_module_loc_conf(r, ngx_http_auth_request_module);
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111
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112 if (arcf->uri.len == 0) {
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113 return NGX_DECLINED;
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114 }
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115
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116 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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117 "auth request handler");
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118
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119 ctx = ngx_http_get_module_ctx(r, ngx_http_auth_request_module);
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120
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121 if (ctx != NULL) {
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122 if (!ctx->done) {
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123 return NGX_AGAIN;
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124 }
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125
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126 /*
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127 * as soon as we are done - explicitly set variables to make
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128 * sure they will be available after internal redirects
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129 */
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130
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131 if (ngx_http_auth_request_set_variables(r, arcf, ctx) != NGX_OK) {
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132 return NGX_ERROR;
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133 }
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134
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135 /* return appropriate status */
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136
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137 if (ctx->status == NGX_HTTP_FORBIDDEN) {
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138 return ctx->status;
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139 }
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140
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141 if (ctx->status == NGX_HTTP_UNAUTHORIZED) {
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142 sr = ctx->subrequest;
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143
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144 h = sr->headers_out.www_authenticate;
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145
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146 if (!h && sr->upstream) {
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147 h = sr->upstream->headers_in.www_authenticate;
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148 }
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149
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150 if (h) {
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151 ho = ngx_list_push(&r->headers_out.headers);
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152 if (ho == NULL) {
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153 return NGX_ERROR;
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154 }
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155
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156 *ho = *h;
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157
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158 r->headers_out.www_authenticate = ho;
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159 }
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160
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161 return ctx->status;
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162 }
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163
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164 if (ctx->status >= NGX_HTTP_OK
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165 && ctx->status < NGX_HTTP_SPECIAL_RESPONSE)
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166 {
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167 return NGX_OK;
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168 }
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169
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170 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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171 "auth request unexpected status: %d", ctx->status);
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172
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173 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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174 }
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175
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176 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_auth_request_ctx_t));
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177 if (ctx == NULL) {
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178 return NGX_ERROR;
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179 }
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180
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181 ps = ngx_palloc(r->pool, sizeof(ngx_http_post_subrequest_t));
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182 if (ps == NULL) {
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183 return NGX_ERROR;
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184 }
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185
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186 ps->handler = ngx_http_auth_request_done;
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187 ps->data = ctx;
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188
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189 if (ngx_http_subrequest(r, &arcf->uri, NULL, &sr, ps,
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190 NGX_HTTP_SUBREQUEST_WAITED)
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191 != NGX_OK)
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192 {
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193 return NGX_ERROR;
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194 }
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195
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196 /*
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197 * allocate fake request body to avoid attempts to read it and to make
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198 * sure real body file (if already read) won't be closed by upstream
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199 */
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200
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201 sr->request_body = ngx_pcalloc(r->pool, sizeof(ngx_http_request_body_t));
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202 if (sr->request_body == NULL) {
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203 return NGX_ERROR;
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204 }
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205
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206 sr->header_only = 1;
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207
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208 ctx->subrequest = sr;
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209
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210 ngx_http_set_ctx(r, ctx, ngx_http_auth_request_module);
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211
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212 return NGX_AGAIN;
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213 }
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214
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215
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216 static ngx_int_t
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217 ngx_http_auth_request_done(ngx_http_request_t *r, void *data, ngx_int_t rc)
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218 {
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219 ngx_http_auth_request_ctx_t *ctx = data;
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220
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221 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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222 "auth request done s:%d", r->headers_out.status);
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223
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224 ctx->done = 1;
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225 ctx->status = r->headers_out.status;
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226
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227 return rc;
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228 }
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229
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230
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231 static ngx_int_t
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232 ngx_http_auth_request_set_variables(ngx_http_request_t *r,
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233 ngx_http_auth_request_conf_t *arcf, ngx_http_auth_request_ctx_t *ctx)
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234 {
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235 ngx_str_t val;
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236 ngx_http_variable_t *v;
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237 ngx_http_variable_value_t *vv;
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238 ngx_http_auth_request_variable_t *av, *last;
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239 ngx_http_core_main_conf_t *cmcf;
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240
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241 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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242 "auth request set variables");
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243
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244 if (arcf->vars == NULL) {
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245 return NGX_OK;
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246 }
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247
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248 cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
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249 v = cmcf->variables.elts;
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250
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251 av = arcf->vars->elts;
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252 last = av + arcf->vars->nelts;
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253
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254 while (av < last) {
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255 /*
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256 * explicitly set new value to make sure it will be available after
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257 * internal redirects
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258 */
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259
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260 vv = &r->variables[av->index];
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261
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262 if (ngx_http_complex_value(ctx->subrequest, &av->value, &val)
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263 != NGX_OK)
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264 {
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265 return NGX_ERROR;
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266 }
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267
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268 vv->valid = 1;
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269 vv->not_found = 0;
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270 vv->data = val.data;
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271 vv->len = val.len;
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272
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273 if (av->set_handler) {
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274 /*
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275 * set_handler only available in cmcf->variables_keys, so we store
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276 * it explicitly
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277 */
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278
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279 av->set_handler(r, vv, v[av->index].data);
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280 }
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281
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282 av++;
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283 }
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284
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285 return NGX_OK;
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286 }
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287
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288
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289 static ngx_int_t
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290 ngx_http_auth_request_variable(ngx_http_request_t *r,
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291 ngx_http_variable_value_t *v, uintptr_t data)
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292 {
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293 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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294 "auth request variable");
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295
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296 v->not_found = 1;
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297
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298 return NGX_OK;
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299 }
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300
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301
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302 static void *
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303 ngx_http_auth_request_create_conf(ngx_conf_t *cf)
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304 {
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305 ngx_http_auth_request_conf_t *conf;
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306
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307 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_auth_request_conf_t));
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308 if (conf == NULL) {
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309 return NULL;
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310 }
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311
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312 /*
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313 * set by ngx_pcalloc():
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314 *
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315 * conf->uri = { 0, NULL };
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316 */
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317
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318 conf->vars = NGX_CONF_UNSET_PTR;
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319
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320 return conf;
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321 }
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322
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323
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324 static char *
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325 ngx_http_auth_request_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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326 {
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327 ngx_http_auth_request_conf_t *prev = parent;
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328 ngx_http_auth_request_conf_t *conf = child;
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329
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330 ngx_conf_merge_str_value(conf->uri, prev->uri, "");
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331 ngx_conf_merge_ptr_value(conf->vars, prev->vars, NULL);
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332
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333 return NGX_CONF_OK;
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334 }
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335
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336
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337 static ngx_int_t
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338 ngx_http_auth_request_init(ngx_conf_t *cf)
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339 {
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340 ngx_http_handler_pt *h;
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341 ngx_http_core_main_conf_t *cmcf;
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342
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343 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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344
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345 h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
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346 if (h == NULL) {
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347 return NGX_ERROR;
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348 }
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349
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350 *h = ngx_http_auth_request_handler;
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351
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352 return NGX_OK;
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353 }
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354
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355
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356 static char *
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357 ngx_http_auth_request(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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358 {
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359 ngx_http_auth_request_conf_t *arcf = conf;
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360
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361 ngx_str_t *value;
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362
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363 if (arcf->uri.data != NULL) {
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364 return "is duplicate";
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365 }
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366
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367 value = cf->args->elts;
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368
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369 if (ngx_strcmp(value[1].data, "off") == 0) {
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370 arcf->uri.len = 0;
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371 arcf->uri.data = (u_char *) "";
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372
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373 return NGX_CONF_OK;
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374 }
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375
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376 arcf->uri = value[1];
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377
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378 return NGX_CONF_OK;
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379 }
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380
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381
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382 static char *
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383 ngx_http_auth_request_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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384 {
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385 ngx_http_auth_request_conf_t *arcf = conf;
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386
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387 ngx_str_t *value;
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388 ngx_http_variable_t *v;
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389 ngx_http_auth_request_variable_t *av;
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390 ngx_http_compile_complex_value_t ccv;
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391
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392 value = cf->args->elts;
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393
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394 if (value[1].data[0] != '$') {
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395 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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396 "invalid variable name \"%V\"", &value[1]);
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397 return NGX_CONF_ERROR;
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398 }
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399
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400 value[1].len--;
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401 value[1].data++;
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402
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403 if (arcf->vars == NGX_CONF_UNSET_PTR) {
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404 arcf->vars = ngx_array_create(cf->pool, 1,
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405 sizeof(ngx_http_auth_request_variable_t));
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406 if (arcf->vars == NULL) {
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407 return NGX_CONF_ERROR;
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408 }
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409 }
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410
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411 av = ngx_array_push(arcf->vars);
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412 if (av == NULL) {
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413 return NGX_CONF_ERROR;
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414 }
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415
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416 v = ngx_http_add_variable(cf, &value[1], NGX_HTTP_VAR_CHANGEABLE);
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417 if (v == NULL) {
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418 return NGX_CONF_ERROR;
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419 }
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420
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421 av->index = ngx_http_get_variable_index(cf, &value[1]);
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422 if (av->index == NGX_ERROR) {
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423 return NGX_CONF_ERROR;
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424 }
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425
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426 if (v->get_handler == NULL) {
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427 v->get_handler = ngx_http_auth_request_variable;
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428 v->data = (uintptr_t) av;
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429 }
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430
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431 av->set_handler = v->set_handler;
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432
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433 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
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434
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435 ccv.cf = cf;
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436 ccv.value = &value[2];
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437 ccv.complex_value = &av->value;
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438
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439 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
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440 return NGX_CONF_ERROR;
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441 }
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442
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443 return NGX_CONF_OK;
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444 }
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