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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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144
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12 #define NGX_HTTP_REFERER_NO_URI_PART ((void *) 4)
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13
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126
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14 typedef struct {
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312
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15 ngx_hash_combined_t hash;
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126
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16
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142
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17 ngx_flag_t no_referer;
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18 ngx_flag_t blocked_referer;
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126
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19
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142
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20 ngx_hash_keys_arrays_t *keys;
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126
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21 } ngx_http_referer_conf_t;
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22
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23
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24 static void * ngx_http_referer_create_conf(ngx_conf_t *cf);
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25 static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent,
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26 void *child);
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27 static char *ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd,
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28 void *conf);
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142
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29 static char *ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys,
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144
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30 ngx_str_t *value, ngx_str_t *uri);
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142
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31 static int ngx_libc_cdecl ngx_http_cmp_referer_wildcards(const void *one,
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32 const void *two);
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126
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33
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34
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35 static ngx_command_t ngx_http_referer_commands[] = {
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36
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37 { ngx_string("valid_referers"),
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38 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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39 ngx_http_valid_referers,
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40 NGX_HTTP_LOC_CONF_OFFSET,
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41 0,
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42 NULL },
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43
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44 ngx_null_command
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45 };
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46
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47
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48 static ngx_http_module_t ngx_http_referer_module_ctx = {
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49 NULL, /* preconfiguration */
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50 NULL, /* postconfiguration */
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51
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52 NULL, /* create main configuration */
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53 NULL, /* init main configuration */
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54
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55 NULL, /* create server configuration */
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56 NULL, /* merge server configuration */
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57
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58 ngx_http_referer_create_conf, /* create location configuration */
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59 ngx_http_referer_merge_conf /* merge location configuration */
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60 };
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61
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62
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63 ngx_module_t ngx_http_referer_module = {
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64 NGX_MODULE_V1,
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65 &ngx_http_referer_module_ctx, /* module context */
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66 ngx_http_referer_commands, /* module directives */
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67 NGX_HTTP_MODULE, /* module type */
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68 NULL, /* init master */
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69 NULL, /* init module */
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70 NULL, /* init process */
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71 NULL, /* init thread */
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72 NULL, /* exit thread */
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73 NULL, /* exit process */
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74 NULL, /* exit master */
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75 NGX_MODULE_V1_PADDING
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76 };
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77
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78
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79 static ngx_int_t
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80 ngx_http_referer_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
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81 uintptr_t data)
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82 {
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144
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83 u_char *p, *ref, *last;
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142
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84 size_t len;
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144
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85 ngx_str_t *uri;
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86 ngx_uint_t i, key;
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142
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87 ngx_http_referer_conf_t *rlcf;
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144
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88 u_char buf[256];
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126
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89
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142
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90 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_referer_module);
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126
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91
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312
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92 if (rlcf->hash.hash.buckets == NULL
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93 && rlcf->hash.wc_head == NULL
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94 && rlcf->hash.wc_tail == NULL)
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95 {
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144
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96 goto valid;
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126
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97 }
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98
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99 if (r->headers_in.referer == NULL) {
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142
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100 if (rlcf->no_referer) {
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144
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101 goto valid;
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102 }
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126
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103
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144
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104 goto invalid;
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126
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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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286
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111 || (ngx_strncasecmp(ref, (u_char *) "http://", 7) != 0))
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126
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112 {
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142
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113 if (rlcf->blocked_referer) {
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144
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114 goto valid;
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115 }
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126
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116
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144
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117 goto invalid;
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126
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118 }
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119
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144
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120 last = ref + len;
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126
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121 ref += 7;
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144
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122 i = 0;
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123 key = 0;
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126
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124
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144
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125 for (p = ref; p < last; p++) {
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142
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126 if (*p == '/' || *p == ':') {
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127 break;
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126
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128 }
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144
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129
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130 buf[i] = ngx_tolower(*p);
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131 key = ngx_hash(key, buf[i++]);
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132
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133 if (i == 256) {
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134 goto invalid;
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135 }
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142
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136 }
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126
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137
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142
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138 len = p - ref;
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126
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139
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312
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140 uri = ngx_hash_find_combined(&rlcf->hash, key, buf, len);
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126
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141
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312
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142 if (uri) {
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143 goto uri;
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126
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144 }
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145
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144
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146 invalid:
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147
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126
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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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144
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151
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152 uri:
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153
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154 for ( /* void */ ; p < last; p++) {
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155 if (*p == '/') {
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156 break;
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157 }
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158 }
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159
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160 len = last - p;
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161
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162 if (uri == NGX_HTTP_REFERER_NO_URI_PART) {
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163 goto valid;
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164 }
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165
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166 if (len < uri->len || ngx_strncmp(uri->data, p, uri->len) != 0) {
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167 goto invalid;
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168 }
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169
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170 valid:
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171
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172 *v = ngx_http_variable_null_value;
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173
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174 return NGX_OK;
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126
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175 }
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176
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177
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178 static void *
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179 ngx_http_referer_create_conf(ngx_conf_t *cf)
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180 {
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181 ngx_http_referer_conf_t *conf;
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182
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142
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183 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_referer_conf_t));
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126
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184 if (conf == NULL) {
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185 return NGX_CONF_ERROR;
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186 }
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187
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188 conf->no_referer = NGX_CONF_UNSET;
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189 conf->blocked_referer = NGX_CONF_UNSET;
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190
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191 return conf;
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192 }
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193
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194
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195 static char *
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196 ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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197 {
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198 ngx_http_referer_conf_t *prev = parent;
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199 ngx_http_referer_conf_t *conf = child;
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200
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142
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201 ngx_hash_init_t hash;
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202
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203 if (conf->keys == NULL) {
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204 conf->hash = prev->hash;
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205
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126
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206 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0);
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207 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0);
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142
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208
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209 return NGX_CONF_OK;
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210 }
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211
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152
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212 if ((conf->no_referer == 1 || conf->blocked_referer == 1)
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312
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213 && conf->keys->keys.nelts == 0
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214 && conf->keys->dns_wc_head.nelts == 0
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215 && conf->keys->dns_wc_tail.nelts == 0)
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152
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216 {
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217 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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218 "the \"none\" or \"blocked\" referers are specified "
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219 "in the \"valid_referers\" directive "
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220 "without any valid referer");
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221 return NGX_CONF_ERROR;
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222 }
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223
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142
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224 hash.key = ngx_hash_key_lc;
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225 hash.max_size = 2048; /* TODO: referer_hash_max_size; */
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226 hash.bucket_size = 64; /* TODO: referer_hash_bucket_size; */
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227 hash.name = "referers_hash";
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228 hash.pool = cf->pool;
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229
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230 if (conf->keys->keys.nelts) {
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312
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231 hash.hash = &conf->hash.hash;
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142
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232 hash.temp_pool = NULL;
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233
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234 if (ngx_hash_init(&hash, conf->keys->keys.elts, conf->keys->keys.nelts)
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235 != NGX_OK)
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236 {
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237 return NGX_CONF_ERROR;
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238 }
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239 }
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240
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312
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241 if (conf->keys->dns_wc_head.nelts) {
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142
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242
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312
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243 ngx_qsort(conf->keys->dns_wc_head.elts,
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244 (size_t) conf->keys->dns_wc_head.nelts,
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142
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245 sizeof(ngx_hash_key_t),
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246 ngx_http_cmp_referer_wildcards);
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247
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248 hash.hash = NULL;
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249 hash.temp_pool = cf->temp_pool;
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250
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312
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251 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_head.elts,
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252 conf->keys->dns_wc_head.nelts)
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142
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253 != NGX_OK)
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254 {
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255 return NGX_CONF_ERROR;
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256 }
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257
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312
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258 conf->hash.wc_head = (ngx_hash_wildcard_t *) hash.hash;
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259 }
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260
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261 if (conf->keys->dns_wc_tail.nelts) {
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262
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263 ngx_qsort(conf->keys->dns_wc_tail.elts,
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264 (size_t) conf->keys->dns_wc_tail.nelts,
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265 sizeof(ngx_hash_key_t),
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266 ngx_http_cmp_referer_wildcards);
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267
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268 hash.hash = NULL;
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269 hash.temp_pool = cf->temp_pool;
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270
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271 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_tail.elts,
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272 conf->keys->dns_wc_tail.nelts)
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273 != NGX_OK)
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274 {
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275 return NGX_CONF_ERROR;
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276 }
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277
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278 conf->hash.wc_tail = (ngx_hash_wildcard_t *) hash.hash;
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126
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279 }
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280
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281 if (conf->no_referer == NGX_CONF_UNSET) {
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282 conf->no_referer = 0;
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283 }
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284
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285 if (conf->blocked_referer == NGX_CONF_UNSET) {
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286 conf->blocked_referer = 0;
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287 }
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288
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160
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289 conf->keys = NULL;
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290
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126
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291 return NGX_CONF_OK;
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292 }
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293
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294
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295 static char *
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296 ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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297 {
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142
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298 ngx_http_referer_conf_t *rlcf = conf;
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126
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299
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142
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300 u_char *p;
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144
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301 ngx_str_t *value, uri, name;
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142
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302 ngx_uint_t i, n;
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126
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303 ngx_http_variable_t *var;
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304 ngx_http_server_name_t *sn;
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305 ngx_http_core_srv_conf_t *cscf;
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306
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307 name.len = sizeof("invalid_referer") - 1;
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308 name.data = (u_char *) "invalid_referer";
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309
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132
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310 var = ngx_http_add_variable(cf, &name,
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311 NGX_HTTP_VAR_CHANGABLE|NGX_HTTP_VAR_NOHASH);
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126
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312 if (var == NULL) {
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313 return NGX_CONF_ERROR;
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314 }
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315
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186
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316 var->get_handler = ngx_http_referer_variable;
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126
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317
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142
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318 if (rlcf->keys == NULL) {
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319 rlcf->keys = ngx_pcalloc(cf->temp_pool, sizeof(ngx_hash_keys_arrays_t));
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320 if (rlcf->keys == NULL) {
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321 return NGX_CONF_ERROR;
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322 }
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126
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323
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142
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324 rlcf->keys->pool = cf->pool;
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325 rlcf->keys->temp_pool = cf->pool;
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326
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327 if (ngx_hash_keys_array_init(rlcf->keys, NGX_HASH_SMALL) != NGX_OK) {
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126
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328 return NGX_CONF_ERROR;
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329 }
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330 }
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331
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332 value = cf->args->elts;
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333
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334 for (i = 1; i < cf->args->nelts; i++) {
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335 if (value[i].len == 0) {
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336 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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337 "invalid referer \"%V\"", &value[i]);
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338 return NGX_CONF_ERROR;
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339 }
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340
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341 if (ngx_strcmp(value[i].data, "none") == 0) {
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142
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342 rlcf->no_referer = 1;
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126
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343 continue;
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344 }
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345
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346 if (ngx_strcmp(value[i].data, "blocked") == 0) {
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142
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347 rlcf->blocked_referer = 1;
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126
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348 continue;
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349 }
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350
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144
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351 uri.len = 0;
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162
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352 uri.data = NULL;
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144
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353
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126
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354 if (ngx_strcmp(value[i].data, "server_names") == 0) {
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142
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355
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356 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module);
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126
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357
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142
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358 sn = cscf->server_names.elts;
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359 for (n = 0; n < cscf->server_names.nelts; n++) {
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144
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360 if (ngx_http_add_referer(cf, rlcf->keys, &sn[n].name, &uri)
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361 != NGX_OK)
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362 {
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142
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363 return NGX_CONF_ERROR;
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364 }
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365 }
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126
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366
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367 continue;
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368 }
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369
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310
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370 p = (u_char *) ngx_strchr(value[i].data, '/');
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126
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371
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142
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372 if (p) {
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144
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373 uri.len = (value[i].data + value[i].len) - p;
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374 uri.data = p;
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142
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375 value[i].len = p - value[i].data;
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126
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376 }
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377
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144
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378 if (ngx_http_add_referer(cf, rlcf->keys, &value[i], &uri) != NGX_OK) {
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126
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379 return NGX_CONF_ERROR;
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380 }
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381 }
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382
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383 return NGX_CONF_OK;
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384 }
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142
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385
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386
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387 static char *
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388 ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys,
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144
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389 ngx_str_t *value, ngx_str_t *uri)
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142
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390 {
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312
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391 ngx_int_t rc;
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392 ngx_str_t *u;
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142
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393
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144
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394 if (uri->len == 0) {
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395 u = NGX_HTTP_REFERER_NO_URI_PART;
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396
|
|
|
397 } else {
|
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398 u = ngx_palloc(cf->pool, sizeof(ngx_str_t));
|
|
|
399 if (u == NULL) {
|
|
|
400 return NGX_CONF_ERROR;
|
|
|
401 }
|
|
|
402
|
|
|
403 *u = *uri;
|
|
|
404 }
|
|
|
405
|
|
312
|
406 rc = ngx_hash_add_key(keys, value, u, NGX_HASH_WILDCARD_KEY);
|
|
142
|
407
|
|
|
408 if (rc == NGX_OK) {
|
|
|
409 return NGX_CONF_OK;
|
|
|
410 }
|
|
|
411
|
|
312
|
412 if (rc == NGX_DECLINED) {
|
|
|
413 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
414 "invalid hostname or wildcard \"%V\"", value);
|
|
|
415 }
|
|
|
416
|
|
142
|
417 if (rc == NGX_BUSY) {
|
|
|
418 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
419 "conflicting parameter \"%V\"", value);
|
|
|
420 }
|
|
|
421
|
|
|
422 return NGX_CONF_ERROR;
|
|
|
423 }
|
|
|
424
|
|
|
425
|
|
|
426 static int ngx_libc_cdecl
|
|
|
427 ngx_http_cmp_referer_wildcards(const void *one, const void *two)
|
|
|
428 {
|
|
|
429 ngx_hash_key_t *first, *second;
|
|
|
430
|
|
|
431 first = (ngx_hash_key_t *) one;
|
|
|
432 second = (ngx_hash_key_t *) two;
|
|
|
433
|
|
|
434 return ngx_strcmp(first->key.data, second->key.data);
|
|
|
435 }
|
