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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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630
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32
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33 ngx_uint_t referer_hash_max_size;
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34 ngx_uint_t referer_hash_bucket_size;
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126
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35 } ngx_http_referer_conf_t;
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36
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37
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38 static void * ngx_http_referer_create_conf(ngx_conf_t *cf);
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39 static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent,
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40 void *child);
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41 static char *ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd,
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42 void *conf);
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142
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43 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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44 ngx_str_t *value, ngx_str_t *uri);
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326
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45 static char *ngx_http_add_regex_referer(ngx_conf_t *cf,
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46 ngx_http_referer_conf_t *rlcf, ngx_str_t *name, ngx_regex_t *regex);
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142
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47 static int ngx_libc_cdecl ngx_http_cmp_referer_wildcards(const void *one,
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48 const void *two);
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126
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49
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50
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51 static ngx_command_t ngx_http_referer_commands[] = {
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52
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53 { ngx_string("valid_referers"),
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54 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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55 ngx_http_valid_referers,
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56 NGX_HTTP_LOC_CONF_OFFSET,
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57 0,
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58 NULL },
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59
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630
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60 { ngx_string("referer_hash_max_size"),
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61 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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62 ngx_conf_set_num_slot,
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63 NGX_HTTP_LOC_CONF_OFFSET,
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64 offsetof(ngx_http_referer_conf_t, referer_hash_max_size),
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65 NULL },
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66
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67 { ngx_string("referer_hash_bucket_size"),
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68 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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69 ngx_conf_set_num_slot,
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70 NGX_HTTP_LOC_CONF_OFFSET,
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71 offsetof(ngx_http_referer_conf_t, referer_hash_bucket_size),
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72 NULL },
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73
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126
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74 ngx_null_command
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75 };
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76
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77
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78 static ngx_http_module_t ngx_http_referer_module_ctx = {
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79 NULL, /* preconfiguration */
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80 NULL, /* postconfiguration */
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81
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82 NULL, /* create main configuration */
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83 NULL, /* init main configuration */
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84
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85 NULL, /* create server configuration */
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86 NULL, /* merge server configuration */
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87
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88 ngx_http_referer_create_conf, /* create location configuration */
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89 ngx_http_referer_merge_conf /* merge location configuration */
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90 };
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91
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92
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93 ngx_module_t ngx_http_referer_module = {
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94 NGX_MODULE_V1,
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95 &ngx_http_referer_module_ctx, /* module context */
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96 ngx_http_referer_commands, /* module directives */
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97 NGX_HTTP_MODULE, /* module type */
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98 NULL, /* init master */
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99 NULL, /* init module */
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100 NULL, /* init process */
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101 NULL, /* init thread */
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102 NULL, /* exit thread */
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103 NULL, /* exit process */
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104 NULL, /* exit master */
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105 NGX_MODULE_V1_PADDING
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106 };
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107
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108
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109 static ngx_int_t
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110 ngx_http_referer_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
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111 uintptr_t data)
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112 {
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326
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113 u_char *p, *ref, *last;
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114 size_t len;
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115 ngx_str_t *uri;
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116 ngx_uint_t i, key;
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117 ngx_http_referer_conf_t *rlcf;
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118 u_char buf[256];
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126
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119
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142
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120 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_referer_module);
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126
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121
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312
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122 if (rlcf->hash.hash.buckets == NULL
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123 && rlcf->hash.wc_head == NULL
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326
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124 && rlcf->hash.wc_tail == NULL
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125 #if (NGX_PCRE)
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126 && rlcf->regex == NULL
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127 #endif
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128 )
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312
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129 {
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144
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130 goto valid;
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126
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131 }
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132
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133 if (r->headers_in.referer == NULL) {
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142
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134 if (rlcf->no_referer) {
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144
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135 goto valid;
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136 }
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126
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137
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144
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138 goto invalid;
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126
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139 }
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140
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141 len = r->headers_in.referer->value.len;
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142 ref = r->headers_in.referer->value.data;
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143
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564
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144 if (len >= sizeof("http://i.ru") - 1) {
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145 last = ref + len;
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146
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147 if (ngx_strncasecmp(ref, (u_char *) "http://", 7) == 0) {
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148 ref += 7;
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149 goto valid_scheme;
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150
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151 } else if (ngx_strncasecmp(ref, (u_char *) "https://", 8) == 0) {
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152 ref += 8;
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153 goto valid_scheme;
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144
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154 }
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126
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155 }
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156
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564
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157 if (rlcf->blocked_referer) {
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158 goto valid;
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159 }
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160
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161 goto invalid;
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162
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163 valid_scheme:
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164
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144
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165 i = 0;
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166 key = 0;
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126
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167
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144
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168 for (p = ref; p < last; p++) {
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142
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169 if (*p == '/' || *p == ':') {
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170 break;
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126
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171 }
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144
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172
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173 buf[i] = ngx_tolower(*p);
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174 key = ngx_hash(key, buf[i++]);
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175
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176 if (i == 256) {
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177 goto invalid;
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178 }
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142
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179 }
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126
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180
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326
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181 uri = ngx_hash_find_combined(&rlcf->hash, key, buf, p - ref);
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126
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182
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312
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183 if (uri) {
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184 goto uri;
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126
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185 }
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186
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326
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187 #if (NGX_PCRE)
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188
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189 if (rlcf->regex) {
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358
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190 ngx_int_t rc;
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191 ngx_str_t referer;
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326
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192
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193 referer.len = len - 7;
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194 referer.data = ref;
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195
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358
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196 rc = ngx_regex_exec_array(rlcf->regex, &referer, r->connection->log);
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326
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197
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358
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198 if (rc == NGX_OK) {
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326
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199 goto valid;
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200 }
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358
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201
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202 if (rc == NGX_ERROR) {
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203 return rc;
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204 }
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205
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206 /* NGX_DECLINED */
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326
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207 }
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208
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209 #endif
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210
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144
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211 invalid:
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212
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126
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213 *v = ngx_http_variable_true_value;
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214
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215 return NGX_OK;
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144
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216
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217 uri:
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218
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219 for ( /* void */ ; p < last; p++) {
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220 if (*p == '/') {
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221 break;
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222 }
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223 }
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224
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225 len = last - p;
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226
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227 if (uri == NGX_HTTP_REFERER_NO_URI_PART) {
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228 goto valid;
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229 }
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230
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231 if (len < uri->len || ngx_strncmp(uri->data, p, uri->len) != 0) {
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232 goto invalid;
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233 }
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234
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235 valid:
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236
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237 *v = ngx_http_variable_null_value;
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238
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239 return NGX_OK;
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126
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240 }
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241
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242
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243 static void *
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244 ngx_http_referer_create_conf(ngx_conf_t *cf)
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245 {
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246 ngx_http_referer_conf_t *conf;
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247
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142
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248 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_referer_conf_t));
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126
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249 if (conf == NULL) {
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496
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250 return NULL;
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126
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251 }
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252
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358
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253 #if (NGX_PCRE)
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254 conf->regex = NGX_CONF_UNSET_PTR;
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255 #endif
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256
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126
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257 conf->no_referer = NGX_CONF_UNSET;
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258 conf->blocked_referer = NGX_CONF_UNSET;
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630
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259 conf->referer_hash_max_size = NGX_CONF_UNSET_UINT;
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260 conf->referer_hash_bucket_size = NGX_CONF_UNSET_UINT;
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126
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261
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262 return conf;
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263 }
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264
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265
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266 static char *
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267 ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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268 {
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269 ngx_http_referer_conf_t *prev = parent;
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270 ngx_http_referer_conf_t *conf = child;
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271
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142
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272 ngx_hash_init_t hash;
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273
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274 if (conf->keys == NULL) {
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275 conf->hash = prev->hash;
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276
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362
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277 #if (NGX_PCRE)
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358
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278 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL);
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362
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279 #endif
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126
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280 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0);
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281 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0);
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630
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282 ngx_conf_merge_uint_value(conf->referer_hash_max_size,
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283 prev->referer_hash_max_size, 2048);
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284 ngx_conf_merge_uint_value(conf->referer_hash_bucket_size,
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285 prev->referer_hash_bucket_size, 64);
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142
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286
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287 return NGX_CONF_OK;
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288 }
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289
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152
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290 if ((conf->no_referer == 1 || conf->blocked_referer == 1)
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312
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291 && conf->keys->keys.nelts == 0
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292 && conf->keys->dns_wc_head.nelts == 0
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293 && conf->keys->dns_wc_tail.nelts == 0)
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152
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294 {
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295 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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296 "the \"none\" or \"blocked\" referers are specified "
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297 "in the \"valid_referers\" directive "
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298 "without any valid referer");
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299 return NGX_CONF_ERROR;
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300 }
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301
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630
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302 ngx_conf_merge_uint_value(conf->referer_hash_max_size,
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303 prev->referer_hash_max_size, 2048);
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304 ngx_conf_merge_uint_value(conf->referer_hash_bucket_size,
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305 prev->referer_hash_bucket_size, 64);
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306 conf->referer_hash_bucket_size = ngx_align(conf->referer_hash_bucket_size,
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307 ngx_cacheline_size);
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308
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142
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309 hash.key = ngx_hash_key_lc;
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630
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310 hash.max_size = conf->referer_hash_max_size;
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311 hash.bucket_size = conf->referer_hash_bucket_size;
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634
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312 hash.name = "referer_hash";
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142
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313 hash.pool = cf->pool;
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314
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315 if (conf->keys->keys.nelts) {
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312
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316 hash.hash = &conf->hash.hash;
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142
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317 hash.temp_pool = NULL;
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318
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319 if (ngx_hash_init(&hash, conf->keys->keys.elts, conf->keys->keys.nelts)
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320 != NGX_OK)
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321 {
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322 return NGX_CONF_ERROR;
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323 }
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324 }
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325
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312
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326 if (conf->keys->dns_wc_head.nelts) {
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142
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327
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312
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328 ngx_qsort(conf->keys->dns_wc_head.elts,
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329 (size_t) conf->keys->dns_wc_head.nelts,
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142
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330 sizeof(ngx_hash_key_t),
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331 ngx_http_cmp_referer_wildcards);
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332
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333 hash.hash = NULL;
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334 hash.temp_pool = cf->temp_pool;
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335
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312
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336 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_head.elts,
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337 conf->keys->dns_wc_head.nelts)
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142
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338 != NGX_OK)
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339 {
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340 return NGX_CONF_ERROR;
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341 }
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342
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312
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343 conf->hash.wc_head = (ngx_hash_wildcard_t *) hash.hash;
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344 }
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345
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346 if (conf->keys->dns_wc_tail.nelts) {
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347
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348 ngx_qsort(conf->keys->dns_wc_tail.elts,
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349 (size_t) conf->keys->dns_wc_tail.nelts,
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350 sizeof(ngx_hash_key_t),
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351 ngx_http_cmp_referer_wildcards);
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352
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353 hash.hash = NULL;
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354 hash.temp_pool = cf->temp_pool;
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355
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356 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_tail.elts,
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357 conf->keys->dns_wc_tail.nelts)
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358 != NGX_OK)
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359 {
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360 return NGX_CONF_ERROR;
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361 }
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362
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363 conf->hash.wc_tail = (ngx_hash_wildcard_t *) hash.hash;
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126
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364 }
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365
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362
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366 #if (NGX_PCRE)
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358
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367 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL);
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362
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368 #endif
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358
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369
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126
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370 if (conf->no_referer == NGX_CONF_UNSET) {
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371 conf->no_referer = 0;
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372 }
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373
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374 if (conf->blocked_referer == NGX_CONF_UNSET) {
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375 conf->blocked_referer = 0;
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376 }
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377
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160
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378 conf->keys = NULL;
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379
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126
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380 return NGX_CONF_OK;
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381 }
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382
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383
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384 static char *
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385 ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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386 {
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142
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387 ngx_http_referer_conf_t *rlcf = conf;
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126
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388
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142
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389 u_char *p;
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144
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390 ngx_str_t *value, uri, name;
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142
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391 ngx_uint_t i, n;
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126
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392 ngx_http_variable_t *var;
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393 ngx_http_server_name_t *sn;
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394 ngx_http_core_srv_conf_t *cscf;
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|
|
395
|
|
570
|
396 ngx_str_set(&name, "invalid_referer");
|
|
126
|
397
|
|
132
|
398 var = ngx_http_add_variable(cf, &name,
|
|
340
|
399 NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOHASH);
|
|
126
|
400 if (var == NULL) {
|
|
|
401 return NGX_CONF_ERROR;
|
|
|
402 }
|
|
|
403
|
|
186
|
404 var->get_handler = ngx_http_referer_variable;
|
|
126
|
405
|
|
142
|
406 if (rlcf->keys == NULL) {
|
|
|
407 rlcf->keys = ngx_pcalloc(cf->temp_pool, sizeof(ngx_hash_keys_arrays_t));
|
|
|
408 if (rlcf->keys == NULL) {
|
|
|
409 return NGX_CONF_ERROR;
|
|
|
410 }
|
|
126
|
411
|
|
142
|
412 rlcf->keys->pool = cf->pool;
|
|
|
413 rlcf->keys->temp_pool = cf->pool;
|
|
|
414
|
|
|
415 if (ngx_hash_keys_array_init(rlcf->keys, NGX_HASH_SMALL) != NGX_OK) {
|
|
126
|
416 return NGX_CONF_ERROR;
|
|
|
417 }
|
|
|
418 }
|
|
|
419
|
|
|
420 value = cf->args->elts;
|
|
|
421
|
|
|
422 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
423 if (value[i].len == 0) {
|
|
|
424 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
425 "invalid referer \"%V\"", &value[i]);
|
|
|
426 return NGX_CONF_ERROR;
|
|
|
427 }
|
|
|
428
|
|
|
429 if (ngx_strcmp(value[i].data, "none") == 0) {
|
|
142
|
430 rlcf->no_referer = 1;
|
|
126
|
431 continue;
|
|
|
432 }
|
|
|
433
|
|
|
434 if (ngx_strcmp(value[i].data, "blocked") == 0) {
|
|
142
|
435 rlcf->blocked_referer = 1;
|
|
126
|
436 continue;
|
|
|
437 }
|
|
|
438
|
|
570
|
439 ngx_str_null(&uri);
|
|
144
|
440
|
|
126
|
441 if (ngx_strcmp(value[i].data, "server_names") == 0) {
|
|
142
|
442
|
|
|
443 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module);
|
|
126
|
444
|
|
142
|
445 sn = cscf->server_names.elts;
|
|
|
446 for (n = 0; n < cscf->server_names.nelts; n++) {
|
|
326
|
447
|
|
|
448 #if (NGX_PCRE)
|
|
|
449 if (sn[n].regex) {
|
|
|
450
|
|
|
451 if (ngx_http_add_regex_referer(cf, rlcf, &sn[n].name,
|
|
546
|
452 sn[n].regex->regex)
|
|
326
|
453 != NGX_OK)
|
|
|
454 {
|
|
|
455 return NGX_CONF_ERROR;
|
|
|
456 }
|
|
|
457
|
|
|
458 continue;
|
|
|
459 }
|
|
|
460 #endif
|
|
|
461
|
|
144
|
462 if (ngx_http_add_referer(cf, rlcf->keys, &sn[n].name, &uri)
|
|
|
463 != NGX_OK)
|
|
|
464 {
|
|
142
|
465 return NGX_CONF_ERROR;
|
|
|
466 }
|
|
|
467 }
|
|
126
|
468
|
|
|
469 continue;
|
|
|
470 }
|
|
|
471
|
|
326
|
472 if (value[i].data[0] == '~') {
|
|
|
473 if (ngx_http_add_regex_referer(cf, rlcf, &value[i], NULL) != NGX_OK)
|
|
|
474 {
|
|
|
475 return NGX_CONF_ERROR;
|
|
|
476 }
|
|
|
477
|
|
|
478 continue;
|
|
|
479 }
|
|
|
480
|
|
310
|
481 p = (u_char *) ngx_strchr(value[i].data, '/');
|
|
126
|
482
|
|
142
|
483 if (p) {
|
|
144
|
484 uri.len = (value[i].data + value[i].len) - p;
|
|
|
485 uri.data = p;
|
|
142
|
486 value[i].len = p - value[i].data;
|
|
126
|
487 }
|
|
|
488
|
|
144
|
489 if (ngx_http_add_referer(cf, rlcf->keys, &value[i], &uri) != NGX_OK) {
|
|
126
|
490 return NGX_CONF_ERROR;
|
|
|
491 }
|
|
|
492 }
|
|
|
493
|
|
|
494 return NGX_CONF_OK;
|
|
|
495 }
|
|
142
|
496
|
|
|
497
|
|
|
498 static char *
|
|
|
499 ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys,
|
|
144
|
500 ngx_str_t *value, ngx_str_t *uri)
|
|
142
|
501 {
|
|
312
|
502 ngx_int_t rc;
|
|
|
503 ngx_str_t *u;
|
|
142
|
504
|
|
144
|
505 if (uri->len == 0) {
|
|
|
506 u = NGX_HTTP_REFERER_NO_URI_PART;
|
|
|
507
|
|
|
508 } else {
|
|
|
509 u = ngx_palloc(cf->pool, sizeof(ngx_str_t));
|
|
|
510 if (u == NULL) {
|
|
|
511 return NGX_CONF_ERROR;
|
|
|
512 }
|
|
|
513
|
|
|
514 *u = *uri;
|
|
|
515 }
|
|
|
516
|
|
312
|
517 rc = ngx_hash_add_key(keys, value, u, NGX_HASH_WILDCARD_KEY);
|
|
142
|
518
|
|
|
519 if (rc == NGX_OK) {
|
|
|
520 return NGX_CONF_OK;
|
|
|
521 }
|
|
|
522
|
|
312
|
523 if (rc == NGX_DECLINED) {
|
|
|
524 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
525 "invalid hostname or wildcard \"%V\"", value);
|
|
|
526 }
|
|
|
527
|
|
142
|
528 if (rc == NGX_BUSY) {
|
|
|
529 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
530 "conflicting parameter \"%V\"", value);
|
|
|
531 }
|
|
|
532
|
|
|
533 return NGX_CONF_ERROR;
|
|
|
534 }
|
|
|
535
|
|
|
536
|
|
326
|
537 static char *
|
|
|
538 ngx_http_add_regex_referer(ngx_conf_t *cf, ngx_http_referer_conf_t *rlcf,
|
|
|
539 ngx_str_t *name, ngx_regex_t *regex)
|
|
|
540 {
|
|
|
541 #if (NGX_PCRE)
|
|
546
|
542 ngx_regex_elt_t *re;
|
|
|
543 ngx_regex_compile_t rc;
|
|
|
544 u_char errstr[NGX_MAX_CONF_ERRSTR];
|
|
326
|
545
|
|
526
|
546 if (name->len == 1) {
|
|
|
547 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "empty regex in \"%V\"", name);
|
|
|
548 return NGX_CONF_ERROR;
|
|
|
549 }
|
|
|
550
|
|
358
|
551 if (rlcf->regex == NGX_CONF_UNSET_PTR) {
|
|
|
552 rlcf->regex = ngx_array_create(cf->pool, 2, sizeof(ngx_regex_elt_t));
|
|
326
|
553 if (rlcf->regex == NULL) {
|
|
|
554 return NGX_CONF_ERROR;
|
|
|
555 }
|
|
|
556 }
|
|
|
557
|
|
358
|
558 re = ngx_array_push(rlcf->regex);
|
|
|
559 if (re == NULL) {
|
|
326
|
560 return NGX_CONF_ERROR;
|
|
|
561 }
|
|
|
562
|
|
|
563 if (regex) {
|
|
358
|
564 re->regex = regex;
|
|
|
565 re->name = name->data;
|
|
326
|
566
|
|
|
567 return NGX_CONF_OK;
|
|
|
568 }
|
|
|
569
|
|
|
570 name->len--;
|
|
|
571 name->data++;
|
|
|
572
|
|
546
|
573 ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
|
|
326
|
574
|
|
546
|
575 rc.pattern = *name;
|
|
|
576 rc.pool = cf->pool;
|
|
|
577 rc.options = NGX_REGEX_CASELESS;
|
|
|
578 rc.err.len = NGX_MAX_CONF_ERRSTR;
|
|
|
579 rc.err.data = errstr;
|
|
|
580
|
|
|
581 if (ngx_regex_compile(&rc) != NGX_OK) {
|
|
|
582 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V", &rc.err);
|
|
326
|
583 return NGX_CONF_ERROR;
|
|
|
584 }
|
|
|
585
|
|
546
|
586 re->regex = rc.regex;
|
|
358
|
587 re->name = name->data;
|
|
326
|
588
|
|
|
589 return NGX_CONF_OK;
|
|
|
590
|
|
|
591 #else
|
|
|
592
|
|
|
593 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
594 "the using of the regex \"%V\" requires PCRE library",
|
|
|
595 name);
|
|
|
596
|
|
|
597 return NGX_CONF_ERROR;
|
|
|
598
|
|
|
599 #endif
|
|
|
600 }
|
|
|
601
|
|
|
602
|
|
142
|
603 static int ngx_libc_cdecl
|
|
|
604 ngx_http_cmp_referer_wildcards(const void *one, const void *two)
|
|
|
605 {
|
|
|
606 ngx_hash_key_t *first, *second;
|
|
|
607
|
|
|
608 first = (ngx_hash_key_t *) one;
|
|
|
609 second = (ngx_hash_key_t *) two;
|
|
|
610
|
|
526
|
611 return ngx_dns_strcmp(first->key.data, second->key.data);
|
|
142
|
612 }
|
