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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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660
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4 * Copyright (C) Nginx, Inc.
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126
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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144
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13 #define NGX_HTTP_REFERER_NO_URI_PART ((void *) 4)
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14
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358
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15 #if !(NGX_PCRE)
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326
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16
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17 #define ngx_regex_t void
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18
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19 #endif
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20
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21
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126
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22 typedef struct {
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312
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23 ngx_hash_combined_t hash;
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126
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24
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326
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25 #if (NGX_PCRE)
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26 ngx_array_t *regex;
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27 #endif
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28
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142
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29 ngx_flag_t no_referer;
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30 ngx_flag_t blocked_referer;
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126
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31
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142
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32 ngx_hash_keys_arrays_t *keys;
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630
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33
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34 ngx_uint_t referer_hash_max_size;
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35 ngx_uint_t referer_hash_bucket_size;
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126
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36 } ngx_http_referer_conf_t;
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37
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38
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39 static void * ngx_http_referer_create_conf(ngx_conf_t *cf);
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40 static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent,
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41 void *child);
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42 static char *ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd,
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43 void *conf);
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142
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44 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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45 ngx_str_t *value, ngx_str_t *uri);
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326
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46 static char *ngx_http_add_regex_referer(ngx_conf_t *cf,
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47 ngx_http_referer_conf_t *rlcf, ngx_str_t *name, ngx_regex_t *regex);
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142
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48 static int ngx_libc_cdecl ngx_http_cmp_referer_wildcards(const void *one,
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49 const void *two);
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126
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50
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51
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52 static ngx_command_t ngx_http_referer_commands[] = {
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53
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54 { ngx_string("valid_referers"),
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55 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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56 ngx_http_valid_referers,
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57 NGX_HTTP_LOC_CONF_OFFSET,
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58 0,
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59 NULL },
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60
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630
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61 { ngx_string("referer_hash_max_size"),
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62 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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63 ngx_conf_set_num_slot,
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64 NGX_HTTP_LOC_CONF_OFFSET,
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65 offsetof(ngx_http_referer_conf_t, referer_hash_max_size),
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66 NULL },
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67
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68 { ngx_string("referer_hash_bucket_size"),
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69 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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70 ngx_conf_set_num_slot,
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71 NGX_HTTP_LOC_CONF_OFFSET,
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72 offsetof(ngx_http_referer_conf_t, referer_hash_bucket_size),
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73 NULL },
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74
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126
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75 ngx_null_command
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76 };
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77
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78
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79 static ngx_http_module_t ngx_http_referer_module_ctx = {
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80 NULL, /* preconfiguration */
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81 NULL, /* postconfiguration */
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82
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83 NULL, /* create main configuration */
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84 NULL, /* init main configuration */
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85
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86 NULL, /* create server configuration */
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87 NULL, /* merge server configuration */
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88
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89 ngx_http_referer_create_conf, /* create location configuration */
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90 ngx_http_referer_merge_conf /* merge location configuration */
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91 };
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92
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93
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94 ngx_module_t ngx_http_referer_module = {
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95 NGX_MODULE_V1,
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96 &ngx_http_referer_module_ctx, /* module context */
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97 ngx_http_referer_commands, /* module directives */
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98 NGX_HTTP_MODULE, /* module type */
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99 NULL, /* init master */
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100 NULL, /* init module */
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101 NULL, /* init process */
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102 NULL, /* init thread */
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103 NULL, /* exit thread */
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104 NULL, /* exit process */
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105 NULL, /* exit master */
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106 NGX_MODULE_V1_PADDING
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107 };
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108
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109
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110 static ngx_int_t
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111 ngx_http_referer_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
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112 uintptr_t data)
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113 {
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326
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114 u_char *p, *ref, *last;
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115 size_t len;
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116 ngx_str_t *uri;
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117 ngx_uint_t i, key;
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118 ngx_http_referer_conf_t *rlcf;
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119 u_char buf[256];
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126
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120
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142
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121 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_referer_module);
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126
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122
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312
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123 if (rlcf->hash.hash.buckets == NULL
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124 && rlcf->hash.wc_head == NULL
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326
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125 && rlcf->hash.wc_tail == NULL
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126 #if (NGX_PCRE)
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127 && rlcf->regex == NULL
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128 #endif
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129 )
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312
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130 {
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144
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131 goto valid;
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126
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132 }
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133
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134 if (r->headers_in.referer == NULL) {
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142
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135 if (rlcf->no_referer) {
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144
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136 goto valid;
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137 }
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126
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138
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144
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139 goto invalid;
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126
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140 }
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141
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142 len = r->headers_in.referer->value.len;
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143 ref = r->headers_in.referer->value.data;
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144
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564
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145 if (len >= sizeof("http://i.ru") - 1) {
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146 last = ref + len;
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147
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148 if (ngx_strncasecmp(ref, (u_char *) "http://", 7) == 0) {
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149 ref += 7;
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150 goto valid_scheme;
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151
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152 } else if (ngx_strncasecmp(ref, (u_char *) "https://", 8) == 0) {
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153 ref += 8;
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154 goto valid_scheme;
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144
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155 }
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126
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156 }
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157
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564
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158 if (rlcf->blocked_referer) {
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159 goto valid;
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160 }
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161
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162 goto invalid;
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163
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164 valid_scheme:
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165
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144
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166 i = 0;
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167 key = 0;
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126
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168
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144
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169 for (p = ref; p < last; p++) {
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142
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170 if (*p == '/' || *p == ':') {
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171 break;
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126
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172 }
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144
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173
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174 buf[i] = ngx_tolower(*p);
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175 key = ngx_hash(key, buf[i++]);
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176
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177 if (i == 256) {
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178 goto invalid;
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179 }
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142
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180 }
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126
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181
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326
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182 uri = ngx_hash_find_combined(&rlcf->hash, key, buf, p - ref);
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126
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183
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312
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184 if (uri) {
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185 goto uri;
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126
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186 }
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187
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326
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188 #if (NGX_PCRE)
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189
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190 if (rlcf->regex) {
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358
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191 ngx_int_t rc;
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192 ngx_str_t referer;
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326
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193
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194 referer.len = len - 7;
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195 referer.data = ref;
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196
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358
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197 rc = ngx_regex_exec_array(rlcf->regex, &referer, r->connection->log);
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326
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198
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358
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199 if (rc == NGX_OK) {
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326
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200 goto valid;
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201 }
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358
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202
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203 if (rc == NGX_ERROR) {
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204 return rc;
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205 }
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206
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207 /* NGX_DECLINED */
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326
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208 }
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209
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210 #endif
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211
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144
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212 invalid:
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213
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126
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214 *v = ngx_http_variable_true_value;
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215
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216 return NGX_OK;
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144
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217
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218 uri:
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219
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220 for ( /* void */ ; p < last; p++) {
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221 if (*p == '/') {
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222 break;
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223 }
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224 }
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225
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226 len = last - p;
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227
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228 if (uri == NGX_HTTP_REFERER_NO_URI_PART) {
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229 goto valid;
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230 }
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231
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232 if (len < uri->len || ngx_strncmp(uri->data, p, uri->len) != 0) {
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233 goto invalid;
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234 }
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235
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236 valid:
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237
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238 *v = ngx_http_variable_null_value;
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239
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240 return NGX_OK;
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126
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241 }
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242
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243
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244 static void *
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245 ngx_http_referer_create_conf(ngx_conf_t *cf)
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246 {
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247 ngx_http_referer_conf_t *conf;
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248
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142
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249 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_referer_conf_t));
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126
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250 if (conf == NULL) {
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496
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251 return NULL;
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126
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252 }
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253
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358
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254 #if (NGX_PCRE)
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255 conf->regex = NGX_CONF_UNSET_PTR;
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256 #endif
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257
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126
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258 conf->no_referer = NGX_CONF_UNSET;
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259 conf->blocked_referer = NGX_CONF_UNSET;
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630
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260 conf->referer_hash_max_size = NGX_CONF_UNSET_UINT;
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261 conf->referer_hash_bucket_size = NGX_CONF_UNSET_UINT;
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126
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262
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263 return conf;
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264 }
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265
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266
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267 static char *
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268 ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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269 {
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270 ngx_http_referer_conf_t *prev = parent;
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271 ngx_http_referer_conf_t *conf = child;
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272
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142
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273 ngx_hash_init_t hash;
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274
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275 if (conf->keys == NULL) {
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276 conf->hash = prev->hash;
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277
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362
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278 #if (NGX_PCRE)
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358
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279 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL);
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362
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280 #endif
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126
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281 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0);
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282 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0);
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630
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283 ngx_conf_merge_uint_value(conf->referer_hash_max_size,
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284 prev->referer_hash_max_size, 2048);
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285 ngx_conf_merge_uint_value(conf->referer_hash_bucket_size,
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286 prev->referer_hash_bucket_size, 64);
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142
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287
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288 return NGX_CONF_OK;
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289 }
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290
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152
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291 if ((conf->no_referer == 1 || conf->blocked_referer == 1)
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312
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292 && conf->keys->keys.nelts == 0
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293 && conf->keys->dns_wc_head.nelts == 0
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294 && conf->keys->dns_wc_tail.nelts == 0)
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152
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295 {
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296 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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297 "the \"none\" or \"blocked\" referers are specified "
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298 "in the \"valid_referers\" directive "
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299 "without any valid referer");
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300 return NGX_CONF_ERROR;
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301 }
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302
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630
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303 ngx_conf_merge_uint_value(conf->referer_hash_max_size,
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304 prev->referer_hash_max_size, 2048);
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305 ngx_conf_merge_uint_value(conf->referer_hash_bucket_size,
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306 prev->referer_hash_bucket_size, 64);
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307 conf->referer_hash_bucket_size = ngx_align(conf->referer_hash_bucket_size,
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308 ngx_cacheline_size);
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309
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142
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310 hash.key = ngx_hash_key_lc;
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630
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311 hash.max_size = conf->referer_hash_max_size;
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312 hash.bucket_size = conf->referer_hash_bucket_size;
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634
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313 hash.name = "referer_hash";
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142
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314 hash.pool = cf->pool;
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315
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316 if (conf->keys->keys.nelts) {
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312
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317 hash.hash = &conf->hash.hash;
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142
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318 hash.temp_pool = NULL;
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319
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320 if (ngx_hash_init(&hash, conf->keys->keys.elts, conf->keys->keys.nelts)
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321 != NGX_OK)
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322 {
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323 return NGX_CONF_ERROR;
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324 }
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325 }
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326
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312
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327 if (conf->keys->dns_wc_head.nelts) {
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142
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328
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312
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329 ngx_qsort(conf->keys->dns_wc_head.elts,
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330 (size_t) conf->keys->dns_wc_head.nelts,
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142
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331 sizeof(ngx_hash_key_t),
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332 ngx_http_cmp_referer_wildcards);
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333
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334 hash.hash = NULL;
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335 hash.temp_pool = cf->temp_pool;
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336
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312
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337 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_head.elts,
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338 conf->keys->dns_wc_head.nelts)
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142
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339 != NGX_OK)
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340 {
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341 return NGX_CONF_ERROR;
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342 }
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343
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312
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344 conf->hash.wc_head = (ngx_hash_wildcard_t *) hash.hash;
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345 }
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346
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347 if (conf->keys->dns_wc_tail.nelts) {
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348
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349 ngx_qsort(conf->keys->dns_wc_tail.elts,
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350 (size_t) conf->keys->dns_wc_tail.nelts,
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351 sizeof(ngx_hash_key_t),
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352 ngx_http_cmp_referer_wildcards);
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353
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354 hash.hash = NULL;
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355 hash.temp_pool = cf->temp_pool;
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356
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357 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_tail.elts,
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358 conf->keys->dns_wc_tail.nelts)
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359 != NGX_OK)
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360 {
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361 return NGX_CONF_ERROR;
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362 }
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363
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364 conf->hash.wc_tail = (ngx_hash_wildcard_t *) hash.hash;
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126
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365 }
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366
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362
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367 #if (NGX_PCRE)
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358
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368 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL);
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362
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369 #endif
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358
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370
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126
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371 if (conf->no_referer == NGX_CONF_UNSET) {
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372 conf->no_referer = 0;
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373 }
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374
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375 if (conf->blocked_referer == NGX_CONF_UNSET) {
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376 conf->blocked_referer = 0;
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377 }
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378
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160
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379 conf->keys = NULL;
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380
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126
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381 return NGX_CONF_OK;
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382 }
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383
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384
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|
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385 static char *
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386 ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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|
|
387 {
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142
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388 ngx_http_referer_conf_t *rlcf = conf;
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126
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389
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142
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390 u_char *p;
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144
|
391 ngx_str_t *value, uri, name;
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142
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392 ngx_uint_t i, n;
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126
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393 ngx_http_variable_t *var;
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394 ngx_http_server_name_t *sn;
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|
|
395 ngx_http_core_srv_conf_t *cscf;
|
|
|
396
|
|
570
|
397 ngx_str_set(&name, "invalid_referer");
|
|
126
|
398
|
|
132
|
399 var = ngx_http_add_variable(cf, &name,
|
|
340
|
400 NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOHASH);
|
|
126
|
401 if (var == NULL) {
|
|
|
402 return NGX_CONF_ERROR;
|
|
|
403 }
|
|
|
404
|
|
186
|
405 var->get_handler = ngx_http_referer_variable;
|
|
126
|
406
|
|
142
|
407 if (rlcf->keys == NULL) {
|
|
|
408 rlcf->keys = ngx_pcalloc(cf->temp_pool, sizeof(ngx_hash_keys_arrays_t));
|
|
|
409 if (rlcf->keys == NULL) {
|
|
|
410 return NGX_CONF_ERROR;
|
|
|
411 }
|
|
126
|
412
|
|
142
|
413 rlcf->keys->pool = cf->pool;
|
|
|
414 rlcf->keys->temp_pool = cf->pool;
|
|
|
415
|
|
|
416 if (ngx_hash_keys_array_init(rlcf->keys, NGX_HASH_SMALL) != NGX_OK) {
|
|
126
|
417 return NGX_CONF_ERROR;
|
|
|
418 }
|
|
|
419 }
|
|
|
420
|
|
|
421 value = cf->args->elts;
|
|
|
422
|
|
|
423 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
424 if (value[i].len == 0) {
|
|
|
425 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
426 "invalid referer \"%V\"", &value[i]);
|
|
|
427 return NGX_CONF_ERROR;
|
|
|
428 }
|
|
|
429
|
|
|
430 if (ngx_strcmp(value[i].data, "none") == 0) {
|
|
142
|
431 rlcf->no_referer = 1;
|
|
126
|
432 continue;
|
|
|
433 }
|
|
|
434
|
|
|
435 if (ngx_strcmp(value[i].data, "blocked") == 0) {
|
|
142
|
436 rlcf->blocked_referer = 1;
|
|
126
|
437 continue;
|
|
|
438 }
|
|
|
439
|
|
570
|
440 ngx_str_null(&uri);
|
|
144
|
441
|
|
126
|
442 if (ngx_strcmp(value[i].data, "server_names") == 0) {
|
|
142
|
443
|
|
|
444 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module);
|
|
126
|
445
|
|
142
|
446 sn = cscf->server_names.elts;
|
|
|
447 for (n = 0; n < cscf->server_names.nelts; n++) {
|
|
326
|
448
|
|
|
449 #if (NGX_PCRE)
|
|
|
450 if (sn[n].regex) {
|
|
|
451
|
|
|
452 if (ngx_http_add_regex_referer(cf, rlcf, &sn[n].name,
|
|
546
|
453 sn[n].regex->regex)
|
|
326
|
454 != NGX_OK)
|
|
|
455 {
|
|
|
456 return NGX_CONF_ERROR;
|
|
|
457 }
|
|
|
458
|
|
|
459 continue;
|
|
|
460 }
|
|
|
461 #endif
|
|
|
462
|
|
144
|
463 if (ngx_http_add_referer(cf, rlcf->keys, &sn[n].name, &uri)
|
|
|
464 != NGX_OK)
|
|
|
465 {
|
|
142
|
466 return NGX_CONF_ERROR;
|
|
|
467 }
|
|
|
468 }
|
|
126
|
469
|
|
|
470 continue;
|
|
|
471 }
|
|
|
472
|
|
326
|
473 if (value[i].data[0] == '~') {
|
|
|
474 if (ngx_http_add_regex_referer(cf, rlcf, &value[i], NULL) != NGX_OK)
|
|
|
475 {
|
|
|
476 return NGX_CONF_ERROR;
|
|
|
477 }
|
|
|
478
|
|
|
479 continue;
|
|
|
480 }
|
|
|
481
|
|
310
|
482 p = (u_char *) ngx_strchr(value[i].data, '/');
|
|
126
|
483
|
|
142
|
484 if (p) {
|
|
144
|
485 uri.len = (value[i].data + value[i].len) - p;
|
|
|
486 uri.data = p;
|
|
142
|
487 value[i].len = p - value[i].data;
|
|
126
|
488 }
|
|
|
489
|
|
144
|
490 if (ngx_http_add_referer(cf, rlcf->keys, &value[i], &uri) != NGX_OK) {
|
|
126
|
491 return NGX_CONF_ERROR;
|
|
|
492 }
|
|
|
493 }
|
|
|
494
|
|
|
495 return NGX_CONF_OK;
|
|
|
496 }
|
|
142
|
497
|
|
|
498
|
|
|
499 static char *
|
|
|
500 ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys,
|
|
144
|
501 ngx_str_t *value, ngx_str_t *uri)
|
|
142
|
502 {
|
|
312
|
503 ngx_int_t rc;
|
|
|
504 ngx_str_t *u;
|
|
142
|
505
|
|
144
|
506 if (uri->len == 0) {
|
|
|
507 u = NGX_HTTP_REFERER_NO_URI_PART;
|
|
|
508
|
|
|
509 } else {
|
|
|
510 u = ngx_palloc(cf->pool, sizeof(ngx_str_t));
|
|
|
511 if (u == NULL) {
|
|
|
512 return NGX_CONF_ERROR;
|
|
|
513 }
|
|
|
514
|
|
|
515 *u = *uri;
|
|
|
516 }
|
|
|
517
|
|
312
|
518 rc = ngx_hash_add_key(keys, value, u, NGX_HASH_WILDCARD_KEY);
|
|
142
|
519
|
|
|
520 if (rc == NGX_OK) {
|
|
|
521 return NGX_CONF_OK;
|
|
|
522 }
|
|
|
523
|
|
312
|
524 if (rc == NGX_DECLINED) {
|
|
|
525 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
526 "invalid hostname or wildcard \"%V\"", value);
|
|
|
527 }
|
|
|
528
|
|
142
|
529 if (rc == NGX_BUSY) {
|
|
|
530 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
531 "conflicting parameter \"%V\"", value);
|
|
|
532 }
|
|
|
533
|
|
|
534 return NGX_CONF_ERROR;
|
|
|
535 }
|
|
|
536
|
|
|
537
|
|
326
|
538 static char *
|
|
|
539 ngx_http_add_regex_referer(ngx_conf_t *cf, ngx_http_referer_conf_t *rlcf,
|
|
|
540 ngx_str_t *name, ngx_regex_t *regex)
|
|
|
541 {
|
|
|
542 #if (NGX_PCRE)
|
|
546
|
543 ngx_regex_elt_t *re;
|
|
|
544 ngx_regex_compile_t rc;
|
|
|
545 u_char errstr[NGX_MAX_CONF_ERRSTR];
|
|
326
|
546
|
|
526
|
547 if (name->len == 1) {
|
|
|
548 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "empty regex in \"%V\"", name);
|
|
|
549 return NGX_CONF_ERROR;
|
|
|
550 }
|
|
|
551
|
|
358
|
552 if (rlcf->regex == NGX_CONF_UNSET_PTR) {
|
|
|
553 rlcf->regex = ngx_array_create(cf->pool, 2, sizeof(ngx_regex_elt_t));
|
|
326
|
554 if (rlcf->regex == NULL) {
|
|
|
555 return NGX_CONF_ERROR;
|
|
|
556 }
|
|
|
557 }
|
|
|
558
|
|
358
|
559 re = ngx_array_push(rlcf->regex);
|
|
|
560 if (re == NULL) {
|
|
326
|
561 return NGX_CONF_ERROR;
|
|
|
562 }
|
|
|
563
|
|
|
564 if (regex) {
|
|
358
|
565 re->regex = regex;
|
|
|
566 re->name = name->data;
|
|
326
|
567
|
|
|
568 return NGX_CONF_OK;
|
|
|
569 }
|
|
|
570
|
|
|
571 name->len--;
|
|
|
572 name->data++;
|
|
|
573
|
|
546
|
574 ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
|
|
326
|
575
|
|
546
|
576 rc.pattern = *name;
|
|
|
577 rc.pool = cf->pool;
|
|
|
578 rc.options = NGX_REGEX_CASELESS;
|
|
|
579 rc.err.len = NGX_MAX_CONF_ERRSTR;
|
|
|
580 rc.err.data = errstr;
|
|
|
581
|
|
|
582 if (ngx_regex_compile(&rc) != NGX_OK) {
|
|
|
583 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V", &rc.err);
|
|
326
|
584 return NGX_CONF_ERROR;
|
|
|
585 }
|
|
|
586
|
|
546
|
587 re->regex = rc.regex;
|
|
358
|
588 re->name = name->data;
|
|
326
|
589
|
|
|
590 return NGX_CONF_OK;
|
|
|
591
|
|
|
592 #else
|
|
|
593
|
|
|
594 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
595 "the using of the regex \"%V\" requires PCRE library",
|
|
|
596 name);
|
|
|
597
|
|
|
598 return NGX_CONF_ERROR;
|
|
|
599
|
|
|
600 #endif
|
|
|
601 }
|
|
|
602
|
|
|
603
|
|
142
|
604 static int ngx_libc_cdecl
|
|
|
605 ngx_http_cmp_referer_wildcards(const void *one, const void *two)
|
|
|
606 {
|
|
|
607 ngx_hash_key_t *first, *second;
|
|
|
608
|
|
|
609 first = (ngx_hash_key_t *) one;
|
|
|
610 second = (ngx_hash_key_t *) two;
|
|
|
611
|
|
526
|
612 return ngx_dns_strcmp(first->key.data, second->key.data);
|
|
142
|
613 }
|
