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126
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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_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 name;
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14 ngx_uint_t wildcard;
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15 } ngx_http_referer_t;
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16
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17 typedef struct {
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18 ngx_array_t *referers; /* ngx_http_referer_t */
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19
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20 ngx_flag_t no_referer;
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21 ngx_flag_t blocked_referer;
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22 } ngx_http_referer_conf_t;
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23
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24
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25 static void * ngx_http_referer_create_conf(ngx_conf_t *cf);
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26 static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent,
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27 void *child);
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28 static char *ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd,
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29 void *conf);
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30
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31
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32 static ngx_command_t ngx_http_referer_commands[] = {
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33
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34 { ngx_string("valid_referers"),
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35 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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36 ngx_http_valid_referers,
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37 NGX_HTTP_LOC_CONF_OFFSET,
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38 0,
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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_referer_module_ctx = {
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46 NULL, /* preconfiguration */
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47 NULL, /* 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_referer_create_conf, /* create location configuration */
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56 ngx_http_referer_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_referer_module = {
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61 NGX_MODULE_V1,
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62 &ngx_http_referer_module_ctx, /* module context */
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63 ngx_http_referer_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_referer_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
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78 uintptr_t data)
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79 {
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80 u_char *ref;
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81 size_t len;
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82 ngx_uint_t i, n;
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83 ngx_http_referer_t *refs;
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84 ngx_http_referer_conf_t *cf;
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85
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86 cf = ngx_http_get_module_loc_conf(r, ngx_http_referer_module);
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87
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88 if (cf->referers == NULL) {
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89 *v = ngx_http_variable_null_value;
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90 return NGX_OK;
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91 }
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92
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93 if (r->headers_in.referer == NULL) {
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94 if (cf->no_referer) {
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95 *v = ngx_http_variable_null_value;
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96 return NGX_OK;
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97
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98 } else {
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99 *v = ngx_http_variable_true_value;
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100 return NGX_OK;
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101 }
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102 }
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103
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104 len = r->headers_in.referer->value.len;
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105 ref = r->headers_in.referer->value.data;
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106
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107 if (len < sizeof("http://i.ru") - 1
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108 || (ngx_strncasecmp(ref, "http://", 7) != 0))
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109 {
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110 if (cf->blocked_referer) {
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111 *v = ngx_http_variable_null_value;
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112 return NGX_OK;
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113
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114 } else {
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115 *v = ngx_http_variable_true_value;
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116 return NGX_OK;
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117 }
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118 }
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119
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120 len -= 7;
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121 ref += 7;
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122
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123 refs = cf->referers->elts;
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124 for (i = 0; i < cf->referers->nelts; i++ ){
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125
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126 if (refs[i].name.len > len) {
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127 continue;
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128 }
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129
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130 if (refs[i].wildcard) {
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131 for (n = 0; n < len; n++) {
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132 if (ref[n] == '/' || ref[n] == ':') {
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133 break;
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134 }
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135
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136 if (ref[n] != '.') {
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137 continue;
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138 }
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139
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140 if (ngx_strncmp(&ref[n], refs[i].name.data,
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141 refs[i].name.len) == 0)
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142 {
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143 *v = ngx_http_variable_null_value;
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144 return NGX_OK;
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145 }
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146 }
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147
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148 } else {
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149 if (ngx_strncasecmp(refs[i].name.data, ref, refs[i].name.len) == 0)
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150 {
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151 *v = ngx_http_variable_null_value;
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152 return NGX_OK;
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153 }
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154 }
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155 }
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156
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157 *v = ngx_http_variable_true_value;
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158
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159 return NGX_OK;
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160 }
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161
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162
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163 static void *
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164 ngx_http_referer_create_conf(ngx_conf_t *cf)
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165 {
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166 ngx_http_referer_conf_t *conf;
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167
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168 conf = ngx_palloc(cf->pool, sizeof(ngx_http_referer_conf_t));
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169 if (conf == NULL) {
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170 return NGX_CONF_ERROR;
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171 }
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172
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173 conf->referers = NULL;
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174 conf->no_referer = NGX_CONF_UNSET;
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175 conf->blocked_referer = NGX_CONF_UNSET;
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176
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177 return conf;
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178 }
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179
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180
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181 static char *
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182 ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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183 {
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184 ngx_http_referer_conf_t *prev = parent;
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185 ngx_http_referer_conf_t *conf = child;
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186
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187 if (conf->referers == NULL) {
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188 conf->referers = prev->referers;
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189 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0);
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190 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0);
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191 }
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192
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193 if (conf->no_referer == NGX_CONF_UNSET) {
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194 conf->no_referer = 0;
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195 }
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196
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197 if (conf->blocked_referer == NGX_CONF_UNSET) {
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198 conf->blocked_referer = 0;
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199 }
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200
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201 return NGX_CONF_OK;
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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_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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207 {
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208 ngx_http_referer_conf_t *lcf = conf;
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209
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210 ngx_uint_t i, server_names;
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211 ngx_str_t *value, name;
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212 ngx_http_referer_t *ref;
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213 ngx_http_variable_t *var;
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214 ngx_http_server_name_t *sn;
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215 ngx_http_core_srv_conf_t *cscf;
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216
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217 name.len = sizeof("invalid_referer") - 1;
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218 name.data = (u_char *) "invalid_referer";
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219
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220 var = ngx_http_add_variable(cf, &name, NGX_HTTP_VAR_CHANGABLE);
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221 if (var == NULL) {
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222 return NGX_CONF_ERROR;
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223 }
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224
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225 var->handler = ngx_http_referer_variable;
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226
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227 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module);
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228
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229 if (lcf->referers == NULL) {
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230 lcf->referers = ngx_array_create(cf->pool,
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231 cf->args->nelts + cscf->server_names.nelts,
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232 sizeof(ngx_http_referer_t));
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233 if (lcf->referers == NULL) {
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234 return NGX_CONF_ERROR;
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235 }
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236 }
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237
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238 value = cf->args->elts;
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239 server_names = 0;
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240
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241 for (i = 1; i < cf->args->nelts; i++) {
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242 if (value[i].len == 0) {
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243 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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244 "invalid referer \"%V\"", &value[i]);
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245 return NGX_CONF_ERROR;
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246 }
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247
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248 if (ngx_strcmp(value[i].data, "none") == 0) {
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249 lcf->no_referer = 1;
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250 continue;
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251 }
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252
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253 if (ngx_strcmp(value[i].data, "blocked") == 0) {
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254 lcf->blocked_referer = 1;
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255 continue;
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256 }
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257
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258 if (ngx_strcmp(value[i].data, "server_names") == 0) {
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259 server_names = 1;
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260 continue;
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261 }
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262
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263 ref = ngx_array_push(lcf->referers);
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264 if (ref == NULL) {
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265 return NGX_CONF_ERROR;
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266 }
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267
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268 if (value[i].data[0] != '*') {
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269 ref->name = value[i];
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270 ref->wildcard = 0;
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271 continue;
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272 }
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273
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274
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275 if (value[i].data[1] != '.') {
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276 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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277 "invalid wildcard referer \"%V\"", &value[i]);
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278 return NGX_CONF_ERROR;
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279 }
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280
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281 ref->name.len = value[i].len - 1;
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282 ref->name.data = value[i].data + 1;
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283 ref->wildcard = 1;
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284 }
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285
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286 if (!server_names) {
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287 return NGX_CONF_OK;
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288 }
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289
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290 sn = cscf->server_names.elts;
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291 for (i = 0; i < cscf->server_names.nelts; i++) {
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292 ref = ngx_array_push(lcf->referers);
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293 if (ref == NULL) {
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294 return NGX_CONF_ERROR;
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295 }
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296
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297 ref->name.len = sn[i].name.len + 1;
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298 ref->name.data = ngx_palloc(cf->pool, ref->name.len);
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299 if (ref->name.data == NULL) {
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300 return NGX_CONF_ERROR;
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301 }
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302
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303 ngx_memcpy(ref->name.data, sn[i].name.data, sn[i].name.len);
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304 ref->name.data[sn[i].name.len] = '/';
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305 ref->wildcard = sn[i].wildcard;
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306 }
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307
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308 return NGX_CONF_OK;
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309 }
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