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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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358
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14 #if !(NGX_PCRE)
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326
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15
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16 #define ngx_regex_t void
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17
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18 #endif
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19
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20
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126
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21 typedef struct {
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312
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22 ngx_hash_combined_t hash;
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126
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23
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326
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24 #if (NGX_PCRE)
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25 ngx_array_t *regex;
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26 #endif
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27
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142
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28 ngx_flag_t no_referer;
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29 ngx_flag_t blocked_referer;
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126
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30
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142
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31 ngx_hash_keys_arrays_t *keys;
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126
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32 } ngx_http_referer_conf_t;
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33
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34
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35 static void * ngx_http_referer_create_conf(ngx_conf_t *cf);
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36 static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent,
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37 void *child);
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38 static char *ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd,
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39 void *conf);
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142
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40 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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41 ngx_str_t *value, ngx_str_t *uri);
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326
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42 static char *ngx_http_add_regex_referer(ngx_conf_t *cf,
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43 ngx_http_referer_conf_t *rlcf, ngx_str_t *name, ngx_regex_t *regex);
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142
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44 static int ngx_libc_cdecl ngx_http_cmp_referer_wildcards(const void *one,
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45 const void *two);
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126
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46
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47
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48 static ngx_command_t ngx_http_referer_commands[] = {
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49
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50 { ngx_string("valid_referers"),
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51 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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52 ngx_http_valid_referers,
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53 NGX_HTTP_LOC_CONF_OFFSET,
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54 0,
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55 NULL },
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56
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57 ngx_null_command
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58 };
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59
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60
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61 static ngx_http_module_t ngx_http_referer_module_ctx = {
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62 NULL, /* preconfiguration */
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63 NULL, /* postconfiguration */
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64
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65 NULL, /* create main configuration */
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66 NULL, /* init main configuration */
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67
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68 NULL, /* create server configuration */
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69 NULL, /* merge server configuration */
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70
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71 ngx_http_referer_create_conf, /* create location configuration */
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72 ngx_http_referer_merge_conf /* merge location configuration */
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73 };
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74
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75
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76 ngx_module_t ngx_http_referer_module = {
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77 NGX_MODULE_V1,
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78 &ngx_http_referer_module_ctx, /* module context */
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79 ngx_http_referer_commands, /* module directives */
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80 NGX_HTTP_MODULE, /* module type */
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81 NULL, /* init master */
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82 NULL, /* init module */
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83 NULL, /* init process */
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84 NULL, /* init thread */
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85 NULL, /* exit thread */
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86 NULL, /* exit process */
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87 NULL, /* exit master */
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88 NGX_MODULE_V1_PADDING
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89 };
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90
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91
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92 static ngx_int_t
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93 ngx_http_referer_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
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94 uintptr_t data)
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95 {
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326
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96 u_char *p, *ref, *last;
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97 size_t len;
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98 ngx_str_t *uri;
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99 ngx_uint_t i, key;
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100 ngx_http_referer_conf_t *rlcf;
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101 u_char buf[256];
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126
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102
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142
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103 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_referer_module);
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126
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104
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312
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105 if (rlcf->hash.hash.buckets == NULL
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106 && rlcf->hash.wc_head == NULL
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326
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107 && rlcf->hash.wc_tail == NULL
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108 #if (NGX_PCRE)
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109 && rlcf->regex == NULL
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110 #endif
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111 )
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312
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112 {
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144
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113 goto valid;
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126
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114 }
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115
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116 if (r->headers_in.referer == NULL) {
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142
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117 if (rlcf->no_referer) {
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144
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118 goto valid;
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119 }
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126
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120
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144
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121 goto invalid;
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126
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122 }
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123
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124 len = r->headers_in.referer->value.len;
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125 ref = r->headers_in.referer->value.data;
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126
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564
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127 if (len >= sizeof("http://i.ru") - 1) {
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128 last = ref + len;
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129
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130 if (ngx_strncasecmp(ref, (u_char *) "http://", 7) == 0) {
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131 ref += 7;
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132 goto valid_scheme;
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133
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134 } else if (ngx_strncasecmp(ref, (u_char *) "https://", 8) == 0) {
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135 ref += 8;
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136 goto valid_scheme;
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144
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137 }
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126
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138 }
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139
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564
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140 if (rlcf->blocked_referer) {
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141 goto valid;
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142 }
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143
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144 goto invalid;
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145
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146 valid_scheme:
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147
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144
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148 i = 0;
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149 key = 0;
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126
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150
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144
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151 for (p = ref; p < last; p++) {
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142
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152 if (*p == '/' || *p == ':') {
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153 break;
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126
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154 }
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144
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155
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156 buf[i] = ngx_tolower(*p);
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157 key = ngx_hash(key, buf[i++]);
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158
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159 if (i == 256) {
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160 goto invalid;
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161 }
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142
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162 }
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126
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163
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326
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164 uri = ngx_hash_find_combined(&rlcf->hash, key, buf, p - ref);
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126
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165
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312
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166 if (uri) {
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167 goto uri;
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126
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168 }
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169
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326
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170 #if (NGX_PCRE)
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171
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172 if (rlcf->regex) {
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358
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173 ngx_int_t rc;
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174 ngx_str_t referer;
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326
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175
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176 referer.len = len - 7;
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177 referer.data = ref;
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178
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358
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179 rc = ngx_regex_exec_array(rlcf->regex, &referer, r->connection->log);
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326
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180
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358
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181 if (rc == NGX_OK) {
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326
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182 goto valid;
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183 }
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358
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184
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185 if (rc == NGX_ERROR) {
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186 return rc;
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187 }
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188
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189 /* NGX_DECLINED */
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326
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190 }
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191
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192 #endif
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193
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144
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194 invalid:
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195
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126
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196 *v = ngx_http_variable_true_value;
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197
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198 return NGX_OK;
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144
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199
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200 uri:
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201
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202 for ( /* void */ ; p < last; p++) {
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203 if (*p == '/') {
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204 break;
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205 }
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206 }
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207
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208 len = last - p;
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209
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210 if (uri == NGX_HTTP_REFERER_NO_URI_PART) {
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211 goto valid;
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212 }
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213
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214 if (len < uri->len || ngx_strncmp(uri->data, p, uri->len) != 0) {
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215 goto invalid;
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216 }
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217
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218 valid:
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219
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220 *v = ngx_http_variable_null_value;
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221
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222 return NGX_OK;
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126
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223 }
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224
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225
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226 static void *
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227 ngx_http_referer_create_conf(ngx_conf_t *cf)
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228 {
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229 ngx_http_referer_conf_t *conf;
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230
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142
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231 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_referer_conf_t));
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126
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232 if (conf == NULL) {
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496
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233 return NULL;
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126
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234 }
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235
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358
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236 #if (NGX_PCRE)
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237 conf->regex = NGX_CONF_UNSET_PTR;
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238 #endif
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239
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126
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240 conf->no_referer = NGX_CONF_UNSET;
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241 conf->blocked_referer = NGX_CONF_UNSET;
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242
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243 return conf;
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244 }
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245
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246
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247 static char *
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248 ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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249 {
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250 ngx_http_referer_conf_t *prev = parent;
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251 ngx_http_referer_conf_t *conf = child;
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252
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142
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253 ngx_hash_init_t hash;
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254
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255 if (conf->keys == NULL) {
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256 conf->hash = prev->hash;
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257
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362
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258 #if (NGX_PCRE)
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358
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259 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL);
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362
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260 #endif
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126
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261 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0);
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262 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0);
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142
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263
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264 return NGX_CONF_OK;
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265 }
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266
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152
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267 if ((conf->no_referer == 1 || conf->blocked_referer == 1)
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312
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268 && conf->keys->keys.nelts == 0
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269 && conf->keys->dns_wc_head.nelts == 0
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270 && conf->keys->dns_wc_tail.nelts == 0)
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152
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271 {
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272 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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273 "the \"none\" or \"blocked\" referers are specified "
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274 "in the \"valid_referers\" directive "
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275 "without any valid referer");
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276 return NGX_CONF_ERROR;
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277 }
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278
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142
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279 hash.key = ngx_hash_key_lc;
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280 hash.max_size = 2048; /* TODO: referer_hash_max_size; */
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281 hash.bucket_size = 64; /* TODO: referer_hash_bucket_size; */
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282 hash.name = "referers_hash";
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283 hash.pool = cf->pool;
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284
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285 if (conf->keys->keys.nelts) {
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312
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286 hash.hash = &conf->hash.hash;
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142
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287 hash.temp_pool = NULL;
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288
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289 if (ngx_hash_init(&hash, conf->keys->keys.elts, conf->keys->keys.nelts)
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290 != NGX_OK)
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291 {
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292 return NGX_CONF_ERROR;
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293 }
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294 }
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295
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312
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296 if (conf->keys->dns_wc_head.nelts) {
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142
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297
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312
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298 ngx_qsort(conf->keys->dns_wc_head.elts,
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299 (size_t) conf->keys->dns_wc_head.nelts,
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142
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300 sizeof(ngx_hash_key_t),
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301 ngx_http_cmp_referer_wildcards);
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302
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303 hash.hash = NULL;
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304 hash.temp_pool = cf->temp_pool;
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305
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312
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306 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_head.elts,
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307 conf->keys->dns_wc_head.nelts)
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142
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308 != NGX_OK)
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309 {
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310 return NGX_CONF_ERROR;
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311 }
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312
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312
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313 conf->hash.wc_head = (ngx_hash_wildcard_t *) hash.hash;
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314 }
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315
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316 if (conf->keys->dns_wc_tail.nelts) {
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317
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318 ngx_qsort(conf->keys->dns_wc_tail.elts,
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319 (size_t) conf->keys->dns_wc_tail.nelts,
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320 sizeof(ngx_hash_key_t),
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321 ngx_http_cmp_referer_wildcards);
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322
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323 hash.hash = NULL;
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324 hash.temp_pool = cf->temp_pool;
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325
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326 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_tail.elts,
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327 conf->keys->dns_wc_tail.nelts)
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328 != NGX_OK)
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329 {
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330 return NGX_CONF_ERROR;
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331 }
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332
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333 conf->hash.wc_tail = (ngx_hash_wildcard_t *) hash.hash;
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126
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334 }
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335
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362
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336 #if (NGX_PCRE)
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358
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337 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL);
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362
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338 #endif
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358
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339
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126
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340 if (conf->no_referer == NGX_CONF_UNSET) {
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341 conf->no_referer = 0;
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342 }
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343
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344 if (conf->blocked_referer == NGX_CONF_UNSET) {
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345 conf->blocked_referer = 0;
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346 }
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347
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160
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348 conf->keys = NULL;
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349
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126
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350 return NGX_CONF_OK;
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351 }
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352
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353
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354 static char *
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355 ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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356 {
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142
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357 ngx_http_referer_conf_t *rlcf = conf;
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126
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358
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142
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359 u_char *p;
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144
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360 ngx_str_t *value, uri, name;
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142
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361 ngx_uint_t i, n;
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126
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362 ngx_http_variable_t *var;
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363 ngx_http_server_name_t *sn;
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364 ngx_http_core_srv_conf_t *cscf;
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365
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366 name.len = sizeof("invalid_referer") - 1;
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367 name.data = (u_char *) "invalid_referer";
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368
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132
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369 var = ngx_http_add_variable(cf, &name,
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340
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370 NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOHASH);
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126
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371 if (var == NULL) {
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372 return NGX_CONF_ERROR;
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373 }
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374
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186
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375 var->get_handler = ngx_http_referer_variable;
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126
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376
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142
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377 if (rlcf->keys == NULL) {
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378 rlcf->keys = ngx_pcalloc(cf->temp_pool, sizeof(ngx_hash_keys_arrays_t));
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379 if (rlcf->keys == NULL) {
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380 return NGX_CONF_ERROR;
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381 }
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126
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382
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142
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383 rlcf->keys->pool = cf->pool;
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384 rlcf->keys->temp_pool = cf->pool;
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385
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386 if (ngx_hash_keys_array_init(rlcf->keys, NGX_HASH_SMALL) != NGX_OK) {
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126
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387 return NGX_CONF_ERROR;
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388 }
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389 }
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390
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391 value = cf->args->elts;
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392
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393 for (i = 1; i < cf->args->nelts; i++) {
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394 if (value[i].len == 0) {
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395 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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396 "invalid referer \"%V\"", &value[i]);
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397 return NGX_CONF_ERROR;
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398 }
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399
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400 if (ngx_strcmp(value[i].data, "none") == 0) {
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142
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401 rlcf->no_referer = 1;
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126
|
402 continue;
|
|
|
403 }
|
|
|
404
|
|
|
405 if (ngx_strcmp(value[i].data, "blocked") == 0) {
|
|
142
|
406 rlcf->blocked_referer = 1;
|
|
126
|
407 continue;
|
|
|
408 }
|
|
|
409
|
|
144
|
410 uri.len = 0;
|
|
162
|
411 uri.data = NULL;
|
|
144
|
412
|
|
126
|
413 if (ngx_strcmp(value[i].data, "server_names") == 0) {
|
|
142
|
414
|
|
|
415 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module);
|
|
126
|
416
|
|
142
|
417 sn = cscf->server_names.elts;
|
|
|
418 for (n = 0; n < cscf->server_names.nelts; n++) {
|
|
326
|
419
|
|
|
420 #if (NGX_PCRE)
|
|
|
421 if (sn[n].regex) {
|
|
|
422
|
|
|
423 if (ngx_http_add_regex_referer(cf, rlcf, &sn[n].name,
|
|
546
|
424 sn[n].regex->regex)
|
|
326
|
425 != NGX_OK)
|
|
|
426 {
|
|
|
427 return NGX_CONF_ERROR;
|
|
|
428 }
|
|
|
429
|
|
|
430 continue;
|
|
|
431 }
|
|
|
432 #endif
|
|
|
433
|
|
144
|
434 if (ngx_http_add_referer(cf, rlcf->keys, &sn[n].name, &uri)
|
|
|
435 != NGX_OK)
|
|
|
436 {
|
|
142
|
437 return NGX_CONF_ERROR;
|
|
|
438 }
|
|
|
439 }
|
|
126
|
440
|
|
|
441 continue;
|
|
|
442 }
|
|
|
443
|
|
326
|
444 if (value[i].data[0] == '~') {
|
|
|
445 if (ngx_http_add_regex_referer(cf, rlcf, &value[i], NULL) != NGX_OK)
|
|
|
446 {
|
|
|
447 return NGX_CONF_ERROR;
|
|
|
448 }
|
|
|
449
|
|
|
450 continue;
|
|
|
451 }
|
|
|
452
|
|
310
|
453 p = (u_char *) ngx_strchr(value[i].data, '/');
|
|
126
|
454
|
|
142
|
455 if (p) {
|
|
144
|
456 uri.len = (value[i].data + value[i].len) - p;
|
|
|
457 uri.data = p;
|
|
142
|
458 value[i].len = p - value[i].data;
|
|
126
|
459 }
|
|
|
460
|
|
144
|
461 if (ngx_http_add_referer(cf, rlcf->keys, &value[i], &uri) != NGX_OK) {
|
|
126
|
462 return NGX_CONF_ERROR;
|
|
|
463 }
|
|
|
464 }
|
|
|
465
|
|
|
466 return NGX_CONF_OK;
|
|
|
467 }
|
|
142
|
468
|
|
|
469
|
|
|
470 static char *
|
|
|
471 ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys,
|
|
144
|
472 ngx_str_t *value, ngx_str_t *uri)
|
|
142
|
473 {
|
|
312
|
474 ngx_int_t rc;
|
|
|
475 ngx_str_t *u;
|
|
142
|
476
|
|
144
|
477 if (uri->len == 0) {
|
|
|
478 u = NGX_HTTP_REFERER_NO_URI_PART;
|
|
|
479
|
|
|
480 } else {
|
|
|
481 u = ngx_palloc(cf->pool, sizeof(ngx_str_t));
|
|
|
482 if (u == NULL) {
|
|
|
483 return NGX_CONF_ERROR;
|
|
|
484 }
|
|
|
485
|
|
|
486 *u = *uri;
|
|
|
487 }
|
|
|
488
|
|
312
|
489 rc = ngx_hash_add_key(keys, value, u, NGX_HASH_WILDCARD_KEY);
|
|
142
|
490
|
|
|
491 if (rc == NGX_OK) {
|
|
|
492 return NGX_CONF_OK;
|
|
|
493 }
|
|
|
494
|
|
312
|
495 if (rc == NGX_DECLINED) {
|
|
|
496 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
497 "invalid hostname or wildcard \"%V\"", value);
|
|
|
498 }
|
|
|
499
|
|
142
|
500 if (rc == NGX_BUSY) {
|
|
|
501 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
502 "conflicting parameter \"%V\"", value);
|
|
|
503 }
|
|
|
504
|
|
|
505 return NGX_CONF_ERROR;
|
|
|
506 }
|
|
|
507
|
|
|
508
|
|
326
|
509 static char *
|
|
|
510 ngx_http_add_regex_referer(ngx_conf_t *cf, ngx_http_referer_conf_t *rlcf,
|
|
|
511 ngx_str_t *name, ngx_regex_t *regex)
|
|
|
512 {
|
|
|
513 #if (NGX_PCRE)
|
|
546
|
514 ngx_regex_elt_t *re;
|
|
|
515 ngx_regex_compile_t rc;
|
|
|
516 u_char errstr[NGX_MAX_CONF_ERRSTR];
|
|
326
|
517
|
|
526
|
518 if (name->len == 1) {
|
|
|
519 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "empty regex in \"%V\"", name);
|
|
|
520 return NGX_CONF_ERROR;
|
|
|
521 }
|
|
|
522
|
|
358
|
523 if (rlcf->regex == NGX_CONF_UNSET_PTR) {
|
|
|
524 rlcf->regex = ngx_array_create(cf->pool, 2, sizeof(ngx_regex_elt_t));
|
|
326
|
525 if (rlcf->regex == NULL) {
|
|
|
526 return NGX_CONF_ERROR;
|
|
|
527 }
|
|
|
528 }
|
|
|
529
|
|
358
|
530 re = ngx_array_push(rlcf->regex);
|
|
|
531 if (re == NULL) {
|
|
326
|
532 return NGX_CONF_ERROR;
|
|
|
533 }
|
|
|
534
|
|
|
535 if (regex) {
|
|
358
|
536 re->regex = regex;
|
|
|
537 re->name = name->data;
|
|
326
|
538
|
|
|
539 return NGX_CONF_OK;
|
|
|
540 }
|
|
|
541
|
|
|
542 name->len--;
|
|
|
543 name->data++;
|
|
|
544
|
|
546
|
545 ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
|
|
326
|
546
|
|
546
|
547 rc.pattern = *name;
|
|
|
548 rc.pool = cf->pool;
|
|
|
549 rc.options = NGX_REGEX_CASELESS;
|
|
|
550 rc.err.len = NGX_MAX_CONF_ERRSTR;
|
|
|
551 rc.err.data = errstr;
|
|
|
552
|
|
|
553 if (ngx_regex_compile(&rc) != NGX_OK) {
|
|
|
554 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V", &rc.err);
|
|
326
|
555 return NGX_CONF_ERROR;
|
|
|
556 }
|
|
|
557
|
|
546
|
558 re->regex = rc.regex;
|
|
358
|
559 re->name = name->data;
|
|
326
|
560
|
|
|
561 return NGX_CONF_OK;
|
|
|
562
|
|
|
563 #else
|
|
|
564
|
|
|
565 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
566 "the using of the regex \"%V\" requires PCRE library",
|
|
|
567 name);
|
|
|
568
|
|
|
569 return NGX_CONF_ERROR;
|
|
|
570
|
|
|
571 #endif
|
|
|
572 }
|
|
|
573
|
|
|
574
|
|
142
|
575 static int ngx_libc_cdecl
|
|
|
576 ngx_http_cmp_referer_wildcards(const void *one, const void *two)
|
|
|
577 {
|
|
|
578 ngx_hash_key_t *first, *second;
|
|
|
579
|
|
|
580 first = (ngx_hash_key_t *) one;
|
|
|
581 second = (ngx_hash_key_t *) two;
|
|
|
582
|
|
526
|
583 return ngx_dns_strcmp(first->key.data, second->key.data);
|
|
142
|
584 }
|
