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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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142
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13 ngx_hash_t hash;
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14 ngx_hash_wildcard_t *dns_wildcards;
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126
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15
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142
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16 ngx_flag_t no_referer;
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17 ngx_flag_t blocked_referer;
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126
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18
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142
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19 ngx_hash_keys_arrays_t *keys;
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126
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20 } ngx_http_referer_conf_t;
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21
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22
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23 static void * ngx_http_referer_create_conf(ngx_conf_t *cf);
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24 static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent,
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25 void *child);
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26 static char *ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd,
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27 void *conf);
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142
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28 static char *ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys,
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29 ngx_str_t *value);
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30 static int ngx_libc_cdecl ngx_http_cmp_referer_wildcards(const void *one,
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31 const void *two);
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126
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32
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33
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34 static ngx_command_t ngx_http_referer_commands[] = {
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35
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36 { ngx_string("valid_referers"),
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37 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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38 ngx_http_valid_referers,
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39 NGX_HTTP_LOC_CONF_OFFSET,
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40 0,
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41 NULL },
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42
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43 ngx_null_command
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44 };
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45
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46
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47 static ngx_http_module_t ngx_http_referer_module_ctx = {
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48 NULL, /* preconfiguration */
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49 NULL, /* postconfiguration */
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50
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51 NULL, /* create main configuration */
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52 NULL, /* init main configuration */
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53
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54 NULL, /* create server configuration */
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55 NULL, /* merge server configuration */
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56
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57 ngx_http_referer_create_conf, /* create location configuration */
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58 ngx_http_referer_merge_conf /* merge location configuration */
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59 };
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60
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61
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62 ngx_module_t ngx_http_referer_module = {
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63 NGX_MODULE_V1,
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64 &ngx_http_referer_module_ctx, /* module context */
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65 ngx_http_referer_commands, /* module directives */
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66 NGX_HTTP_MODULE, /* module type */
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67 NULL, /* init master */
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68 NULL, /* init module */
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69 NULL, /* init process */
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70 NULL, /* init thread */
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71 NULL, /* exit thread */
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72 NULL, /* exit process */
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73 NULL, /* exit master */
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74 NGX_MODULE_V1_PADDING
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75 };
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76
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77
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78 static ngx_int_t
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79 ngx_http_referer_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
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80 uintptr_t data)
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81 {
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142
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82 u_char *p, *ref;
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83 size_t len;
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84 ngx_http_referer_conf_t *rlcf;
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126
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85
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142
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86 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_referer_module);
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126
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87
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142
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88 if (rlcf->hash.buckets == NULL
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89 && rlcf->dns_wildcards == NULL
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90 && rlcf->dns_wildcards->hash.buckets == NULL)
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91 {
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126
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92 *v = ngx_http_variable_null_value;
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93 return NGX_OK;
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94 }
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95
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96 if (r->headers_in.referer == NULL) {
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142
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97 if (rlcf->no_referer) {
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126
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98 *v = ngx_http_variable_null_value;
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99 return NGX_OK;
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100
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101 } else {
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102 *v = ngx_http_variable_true_value;
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103 return NGX_OK;
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104 }
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105 }
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106
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107 len = r->headers_in.referer->value.len;
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108 ref = r->headers_in.referer->value.data;
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109
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110 if (len < sizeof("http://i.ru") - 1
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111 || (ngx_strncasecmp(ref, "http://", 7) != 0))
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112 {
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142
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113 if (rlcf->blocked_referer) {
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126
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114 *v = ngx_http_variable_null_value;
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115 return NGX_OK;
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116
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117 } else {
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118 *v = ngx_http_variable_true_value;
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119 return NGX_OK;
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120 }
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121 }
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122
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123 len -= 7;
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124 ref += 7;
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125
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142
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126 for (p = ref; p < ref + len; p++) {
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127 if (*p == '/' || *p == ':') {
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128 break;
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126
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129 }
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142
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130 }
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126
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131
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142
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132 len = p - ref;
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126
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133
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142
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134 if (rlcf->hash.buckets) {
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135 if (ngx_hash_find(&rlcf->hash, ngx_hash_key_lc(ref, len), ref, len)) {
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136 *v = ngx_http_variable_null_value;
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137 return NGX_OK;
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138 }
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139 }
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126
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140
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142
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141 if (rlcf->dns_wildcards && rlcf->dns_wildcards->hash.buckets) {
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142 if (ngx_hash_find_wildcard(rlcf->dns_wildcards, ref, len)) {
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143 *v = ngx_http_variable_null_value;
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144 return NGX_OK;
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126
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145 }
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146 }
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147
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148 *v = ngx_http_variable_true_value;
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149
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150 return NGX_OK;
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151 }
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152
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153
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154 static void *
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155 ngx_http_referer_create_conf(ngx_conf_t *cf)
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156 {
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157 ngx_http_referer_conf_t *conf;
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158
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142
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159 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_referer_conf_t));
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126
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160 if (conf == NULL) {
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161 return NGX_CONF_ERROR;
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162 }
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163
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164 conf->no_referer = NGX_CONF_UNSET;
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165 conf->blocked_referer = NGX_CONF_UNSET;
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166
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167 return conf;
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168 }
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169
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170
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171 static char *
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172 ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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173 {
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174 ngx_http_referer_conf_t *prev = parent;
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175 ngx_http_referer_conf_t *conf = child;
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176
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142
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177 ngx_hash_init_t hash;
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178
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179 if (conf->keys == NULL) {
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180 conf->hash = prev->hash;
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181 conf->dns_wildcards = prev->dns_wildcards;
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182
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126
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183 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0);
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184 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0);
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142
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185
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186 return NGX_CONF_OK;
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187 }
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188
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189 hash.key = ngx_hash_key_lc;
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190 hash.max_size = 2048; /* TODO: referer_hash_max_size; */
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191 hash.bucket_size = 64; /* TODO: referer_hash_bucket_size; */
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192 hash.name = "referers_hash";
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193 hash.pool = cf->pool;
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194
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195 if (conf->keys->keys.nelts) {
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196 hash.hash = &conf->hash;
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197 hash.temp_pool = NULL;
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198
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199 if (ngx_hash_init(&hash, conf->keys->keys.elts, conf->keys->keys.nelts)
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200 != NGX_OK)
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201 {
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202 return NGX_CONF_ERROR;
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203 }
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204 }
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205
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206 if (conf->keys->dns_wildcards.nelts) {
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207
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208 ngx_qsort(conf->keys->dns_wildcards.elts,
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209 (size_t) conf->keys->dns_wildcards.nelts,
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210 sizeof(ngx_hash_key_t),
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211 ngx_http_cmp_referer_wildcards);
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212
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213 hash.hash = NULL;
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214 hash.temp_pool = cf->temp_pool;
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215
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216 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wildcards.elts,
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217 conf->keys->dns_wildcards.nelts)
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218 != NGX_OK)
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219 {
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220 return NGX_CONF_ERROR;
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221 }
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222
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223 conf->dns_wildcards = (ngx_hash_wildcard_t *) hash.hash;
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126
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224 }
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225
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226 if (conf->no_referer == NGX_CONF_UNSET) {
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227 conf->no_referer = 0;
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228 }
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229
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230 if (conf->blocked_referer == NGX_CONF_UNSET) {
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231 conf->blocked_referer = 0;
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232 }
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233
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234 return NGX_CONF_OK;
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235 }
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236
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237
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238 static char *
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239 ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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240 {
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142
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241 ngx_http_referer_conf_t *rlcf = conf;
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126
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242
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142
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243 u_char *p;
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126
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244 ngx_str_t *value, name;
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142
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245 ngx_uint_t i, n;
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126
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246 ngx_http_variable_t *var;
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247 ngx_http_server_name_t *sn;
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248 ngx_http_core_srv_conf_t *cscf;
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249
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250 name.len = sizeof("invalid_referer") - 1;
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251 name.data = (u_char *) "invalid_referer";
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252
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132
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253 var = ngx_http_add_variable(cf, &name,
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254 NGX_HTTP_VAR_CHANGABLE|NGX_HTTP_VAR_NOHASH);
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126
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255 if (var == NULL) {
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256 return NGX_CONF_ERROR;
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257 }
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258
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259 var->handler = ngx_http_referer_variable;
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260
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142
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261 if (rlcf->keys == NULL) {
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262 rlcf->keys = ngx_pcalloc(cf->temp_pool, sizeof(ngx_hash_keys_arrays_t));
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263 if (rlcf->keys == NULL) {
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264 return NGX_CONF_ERROR;
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265 }
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126
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266
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142
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267 rlcf->keys->pool = cf->pool;
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268 rlcf->keys->temp_pool = cf->pool;
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269
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270 if (ngx_hash_keys_array_init(rlcf->keys, NGX_HASH_SMALL) != NGX_OK) {
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126
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271 return NGX_CONF_ERROR;
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272 }
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273 }
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274
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275 value = cf->args->elts;
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276
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277 for (i = 1; i < cf->args->nelts; i++) {
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278 if (value[i].len == 0) {
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279 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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280 "invalid referer \"%V\"", &value[i]);
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281 return NGX_CONF_ERROR;
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282 }
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283
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284 if (ngx_strcmp(value[i].data, "none") == 0) {
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142
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285 rlcf->no_referer = 1;
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126
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286 continue;
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287 }
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288
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289 if (ngx_strcmp(value[i].data, "blocked") == 0) {
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142
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290 rlcf->blocked_referer = 1;
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126
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291 continue;
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292 }
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293
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294 if (ngx_strcmp(value[i].data, "server_names") == 0) {
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142
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295
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296 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module);
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126
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297
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142
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298 sn = cscf->server_names.elts;
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299 for (n = 0; n < cscf->server_names.nelts; n++) {
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300 if (ngx_http_add_referer(cf, rlcf->keys, &sn[n].name) != NGX_OK) {
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301 return NGX_CONF_ERROR;
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302 }
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303 }
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126
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304
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305 continue;
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306 }
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307
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142
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308 p = (u_char *) ngx_strstr(value[i].data, "/");
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126
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309
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142
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310 if (p) {
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126
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311 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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142
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312 "URI part \"%s\" is deprecated, ignored", p);
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313
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314 value[i].len = p - value[i].data;
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126
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315 }
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316
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142
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317 if (ngx_http_add_referer(cf, rlcf->keys, &value[i]) != NGX_OK) {
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126
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318 return NGX_CONF_ERROR;
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319 }
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320 }
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321
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322 return NGX_CONF_OK;
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323 }
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142
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324
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325
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326 static char *
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327 ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys,
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328 ngx_str_t *value)
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329 {
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330 u_char ch;
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331 ngx_int_t rc;
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332 ngx_uint_t flags;
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333
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334 ch = value->data[0];
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335
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336 if ((ch == '*' && (value->len < 3 || value->data[1] != '.'))
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337 || (ch == '.' && value->len < 2))
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338 {
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339 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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340 "invalid DNS wildcard \"%V\"", value);
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341
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342 return NGX_CONF_ERROR;
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343 }
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344
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345 flags = (ch == '*' || ch == '.') ? NGX_HASH_WILDCARD_KEY : 0;
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346
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347 rc = ngx_hash_add_key(keys, value, (void *) 4, flags);
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348
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349 if (rc == NGX_OK) {
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350 return NGX_CONF_OK;
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351 }
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352
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353 if (rc == NGX_BUSY) {
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354 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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355 "conflicting parameter \"%V\"", value);
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356 }
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357
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358 return NGX_CONF_ERROR;
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359 }
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360
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361
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362 static int ngx_libc_cdecl
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363 ngx_http_cmp_referer_wildcards(const void *one, const void *two)
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364 {
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365 ngx_hash_key_t *first, *second;
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366
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367 first = (ngx_hash_key_t *) one;
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368 second = (ngx_hash_key_t *) two;
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369
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370 return ngx_strcmp(first->key.data, second->key.data);
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371 }
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