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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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127 if (len < sizeof("http://i.ru") - 1
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286
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128 || (ngx_strncasecmp(ref, (u_char *) "http://", 7) != 0))
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126
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129 {
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142
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130 if (rlcf->blocked_referer) {
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144
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131 goto valid;
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132 }
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126
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133
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144
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134 goto invalid;
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126
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135 }
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136
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144
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137 last = ref + len;
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126
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138 ref += 7;
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144
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139 i = 0;
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140 key = 0;
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126
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141
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144
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142 for (p = ref; p < last; p++) {
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142
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143 if (*p == '/' || *p == ':') {
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144 break;
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126
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145 }
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144
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146
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147 buf[i] = ngx_tolower(*p);
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148 key = ngx_hash(key, buf[i++]);
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149
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150 if (i == 256) {
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151 goto invalid;
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152 }
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142
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153 }
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126
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154
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326
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155 uri = ngx_hash_find_combined(&rlcf->hash, key, buf, p - ref);
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126
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156
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312
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157 if (uri) {
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158 goto uri;
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126
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159 }
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160
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326
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161 #if (NGX_PCRE)
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162
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163 if (rlcf->regex) {
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358
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164 ngx_int_t rc;
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165 ngx_str_t referer;
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326
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166
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167 referer.len = len - 7;
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168 referer.data = ref;
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169
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358
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170 rc = ngx_regex_exec_array(rlcf->regex, &referer, r->connection->log);
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326
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171
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358
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172 if (rc == NGX_OK) {
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326
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173 goto valid;
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174 }
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358
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175
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176 if (rc == NGX_ERROR) {
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177 return rc;
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178 }
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179
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180 /* NGX_DECLINED */
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326
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181 }
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182
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183 #endif
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184
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144
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185 invalid:
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186
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126
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187 *v = ngx_http_variable_true_value;
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188
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189 return NGX_OK;
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144
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190
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191 uri:
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192
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193 for ( /* void */ ; p < last; p++) {
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194 if (*p == '/') {
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195 break;
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196 }
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197 }
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198
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199 len = last - p;
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200
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201 if (uri == NGX_HTTP_REFERER_NO_URI_PART) {
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202 goto valid;
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203 }
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204
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205 if (len < uri->len || ngx_strncmp(uri->data, p, uri->len) != 0) {
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206 goto invalid;
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207 }
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208
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209 valid:
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210
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211 *v = ngx_http_variable_null_value;
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212
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213 return NGX_OK;
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126
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214 }
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215
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216
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217 static void *
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218 ngx_http_referer_create_conf(ngx_conf_t *cf)
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219 {
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220 ngx_http_referer_conf_t *conf;
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221
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142
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222 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_referer_conf_t));
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126
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223 if (conf == NULL) {
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224 return NGX_CONF_ERROR;
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225 }
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226
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358
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227 #if (NGX_PCRE)
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228 conf->regex = NGX_CONF_UNSET_PTR;
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229 #endif
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230
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126
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231 conf->no_referer = NGX_CONF_UNSET;
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232 conf->blocked_referer = NGX_CONF_UNSET;
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233
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234 return conf;
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235 }
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236
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237
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238 static char *
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239 ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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240 {
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241 ngx_http_referer_conf_t *prev = parent;
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242 ngx_http_referer_conf_t *conf = child;
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243
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142
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244 ngx_hash_init_t hash;
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245
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246 if (conf->keys == NULL) {
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247 conf->hash = prev->hash;
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248
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358
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249 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL);
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126
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250 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0);
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251 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0);
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142
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252
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253 return NGX_CONF_OK;
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254 }
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255
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152
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256 if ((conf->no_referer == 1 || conf->blocked_referer == 1)
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312
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257 && conf->keys->keys.nelts == 0
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258 && conf->keys->dns_wc_head.nelts == 0
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259 && conf->keys->dns_wc_tail.nelts == 0)
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152
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260 {
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261 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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262 "the \"none\" or \"blocked\" referers are specified "
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263 "in the \"valid_referers\" directive "
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264 "without any valid referer");
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265 return NGX_CONF_ERROR;
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266 }
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267
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142
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268 hash.key = ngx_hash_key_lc;
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269 hash.max_size = 2048; /* TODO: referer_hash_max_size; */
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270 hash.bucket_size = 64; /* TODO: referer_hash_bucket_size; */
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271 hash.name = "referers_hash";
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272 hash.pool = cf->pool;
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273
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274 if (conf->keys->keys.nelts) {
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312
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275 hash.hash = &conf->hash.hash;
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142
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276 hash.temp_pool = NULL;
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277
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278 if (ngx_hash_init(&hash, conf->keys->keys.elts, conf->keys->keys.nelts)
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279 != NGX_OK)
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280 {
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281 return NGX_CONF_ERROR;
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282 }
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283 }
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284
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312
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285 if (conf->keys->dns_wc_head.nelts) {
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142
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286
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312
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287 ngx_qsort(conf->keys->dns_wc_head.elts,
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288 (size_t) conf->keys->dns_wc_head.nelts,
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142
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289 sizeof(ngx_hash_key_t),
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290 ngx_http_cmp_referer_wildcards);
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291
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292 hash.hash = NULL;
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293 hash.temp_pool = cf->temp_pool;
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294
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312
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295 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_head.elts,
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296 conf->keys->dns_wc_head.nelts)
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142
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297 != NGX_OK)
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298 {
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299 return NGX_CONF_ERROR;
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300 }
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301
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312
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302 conf->hash.wc_head = (ngx_hash_wildcard_t *) hash.hash;
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303 }
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304
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305 if (conf->keys->dns_wc_tail.nelts) {
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306
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307 ngx_qsort(conf->keys->dns_wc_tail.elts,
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308 (size_t) conf->keys->dns_wc_tail.nelts,
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309 sizeof(ngx_hash_key_t),
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310 ngx_http_cmp_referer_wildcards);
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311
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312 hash.hash = NULL;
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313 hash.temp_pool = cf->temp_pool;
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314
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315 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_tail.elts,
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316 conf->keys->dns_wc_tail.nelts)
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317 != NGX_OK)
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318 {
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319 return NGX_CONF_ERROR;
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320 }
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321
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322 conf->hash.wc_tail = (ngx_hash_wildcard_t *) hash.hash;
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126
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323 }
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324
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358
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325 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL);
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326
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126
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327 if (conf->no_referer == NGX_CONF_UNSET) {
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328 conf->no_referer = 0;
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329 }
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330
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331 if (conf->blocked_referer == NGX_CONF_UNSET) {
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332 conf->blocked_referer = 0;
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333 }
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334
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160
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335 conf->keys = NULL;
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336
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126
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337 return NGX_CONF_OK;
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338 }
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339
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340
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341 static char *
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342 ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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343 {
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142
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344 ngx_http_referer_conf_t *rlcf = conf;
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126
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345
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142
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346 u_char *p;
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144
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347 ngx_str_t *value, uri, name;
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142
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348 ngx_uint_t i, n;
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126
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349 ngx_http_variable_t *var;
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350 ngx_http_server_name_t *sn;
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351 ngx_http_core_srv_conf_t *cscf;
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352
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353 name.len = sizeof("invalid_referer") - 1;
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354 name.data = (u_char *) "invalid_referer";
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355
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132
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356 var = ngx_http_add_variable(cf, &name,
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340
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357 NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOHASH);
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126
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358 if (var == NULL) {
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359 return NGX_CONF_ERROR;
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360 }
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361
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186
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362 var->get_handler = ngx_http_referer_variable;
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126
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363
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142
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364 if (rlcf->keys == NULL) {
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365 rlcf->keys = ngx_pcalloc(cf->temp_pool, sizeof(ngx_hash_keys_arrays_t));
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366 if (rlcf->keys == NULL) {
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367 return NGX_CONF_ERROR;
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368 }
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126
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369
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142
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370 rlcf->keys->pool = cf->pool;
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371 rlcf->keys->temp_pool = cf->pool;
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372
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373 if (ngx_hash_keys_array_init(rlcf->keys, NGX_HASH_SMALL) != NGX_OK) {
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126
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374 return NGX_CONF_ERROR;
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375 }
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376 }
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377
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378 value = cf->args->elts;
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379
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380 for (i = 1; i < cf->args->nelts; i++) {
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381 if (value[i].len == 0) {
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382 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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383 "invalid referer \"%V\"", &value[i]);
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384 return NGX_CONF_ERROR;
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385 }
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386
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387 if (ngx_strcmp(value[i].data, "none") == 0) {
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142
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388 rlcf->no_referer = 1;
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126
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389 continue;
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390 }
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391
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392 if (ngx_strcmp(value[i].data, "blocked") == 0) {
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142
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393 rlcf->blocked_referer = 1;
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126
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394 continue;
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395 }
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396
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144
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397 uri.len = 0;
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162
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398 uri.data = NULL;
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144
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399
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126
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400 if (ngx_strcmp(value[i].data, "server_names") == 0) {
|
|
142
|
401
|
|
|
402 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module);
|
|
126
|
403
|
|
142
|
404 sn = cscf->server_names.elts;
|
|
|
405 for (n = 0; n < cscf->server_names.nelts; n++) {
|
|
326
|
406
|
|
|
407 #if (NGX_PCRE)
|
|
|
408 if (sn[n].regex) {
|
|
|
409
|
|
|
410 if (ngx_http_add_regex_referer(cf, rlcf, &sn[n].name,
|
|
|
411 sn[n].regex)
|
|
|
412 != NGX_OK)
|
|
|
413 {
|
|
|
414 return NGX_CONF_ERROR;
|
|
|
415 }
|
|
|
416
|
|
|
417 continue;
|
|
|
418 }
|
|
|
419 #endif
|
|
|
420
|
|
144
|
421 if (ngx_http_add_referer(cf, rlcf->keys, &sn[n].name, &uri)
|
|
|
422 != NGX_OK)
|
|
|
423 {
|
|
142
|
424 return NGX_CONF_ERROR;
|
|
|
425 }
|
|
|
426 }
|
|
126
|
427
|
|
|
428 continue;
|
|
|
429 }
|
|
|
430
|
|
326
|
431 if (value[i].data[0] == '~') {
|
|
|
432 if (ngx_http_add_regex_referer(cf, rlcf, &value[i], NULL) != NGX_OK)
|
|
|
433 {
|
|
|
434 return NGX_CONF_ERROR;
|
|
|
435 }
|
|
|
436
|
|
|
437 continue;
|
|
|
438 }
|
|
|
439
|
|
310
|
440 p = (u_char *) ngx_strchr(value[i].data, '/');
|
|
126
|
441
|
|
142
|
442 if (p) {
|
|
144
|
443 uri.len = (value[i].data + value[i].len) - p;
|
|
|
444 uri.data = p;
|
|
142
|
445 value[i].len = p - value[i].data;
|
|
126
|
446 }
|
|
|
447
|
|
144
|
448 if (ngx_http_add_referer(cf, rlcf->keys, &value[i], &uri) != NGX_OK) {
|
|
126
|
449 return NGX_CONF_ERROR;
|
|
|
450 }
|
|
|
451 }
|
|
|
452
|
|
|
453 return NGX_CONF_OK;
|
|
|
454 }
|
|
142
|
455
|
|
|
456
|
|
|
457 static char *
|
|
|
458 ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys,
|
|
144
|
459 ngx_str_t *value, ngx_str_t *uri)
|
|
142
|
460 {
|
|
312
|
461 ngx_int_t rc;
|
|
|
462 ngx_str_t *u;
|
|
142
|
463
|
|
144
|
464 if (uri->len == 0) {
|
|
|
465 u = NGX_HTTP_REFERER_NO_URI_PART;
|
|
|
466
|
|
|
467 } else {
|
|
|
468 u = ngx_palloc(cf->pool, sizeof(ngx_str_t));
|
|
|
469 if (u == NULL) {
|
|
|
470 return NGX_CONF_ERROR;
|
|
|
471 }
|
|
|
472
|
|
|
473 *u = *uri;
|
|
|
474 }
|
|
|
475
|
|
312
|
476 rc = ngx_hash_add_key(keys, value, u, NGX_HASH_WILDCARD_KEY);
|
|
142
|
477
|
|
|
478 if (rc == NGX_OK) {
|
|
|
479 return NGX_CONF_OK;
|
|
|
480 }
|
|
|
481
|
|
312
|
482 if (rc == NGX_DECLINED) {
|
|
|
483 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
484 "invalid hostname or wildcard \"%V\"", value);
|
|
|
485 }
|
|
|
486
|
|
142
|
487 if (rc == NGX_BUSY) {
|
|
|
488 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
489 "conflicting parameter \"%V\"", value);
|
|
|
490 }
|
|
|
491
|
|
|
492 return NGX_CONF_ERROR;
|
|
|
493 }
|
|
|
494
|
|
|
495
|
|
326
|
496 static char *
|
|
|
497 ngx_http_add_regex_referer(ngx_conf_t *cf, ngx_http_referer_conf_t *rlcf,
|
|
|
498 ngx_str_t *name, ngx_regex_t *regex)
|
|
|
499 {
|
|
|
500 #if (NGX_PCRE)
|
|
358
|
501 ngx_str_t err;
|
|
|
502 ngx_regex_elt_t *re;
|
|
|
503 u_char errstr[NGX_MAX_CONF_ERRSTR];
|
|
326
|
504
|
|
358
|
505 if (rlcf->regex == NGX_CONF_UNSET_PTR) {
|
|
|
506 rlcf->regex = ngx_array_create(cf->pool, 2, sizeof(ngx_regex_elt_t));
|
|
326
|
507 if (rlcf->regex == NULL) {
|
|
|
508 return NGX_CONF_ERROR;
|
|
|
509 }
|
|
|
510 }
|
|
|
511
|
|
358
|
512 re = ngx_array_push(rlcf->regex);
|
|
|
513 if (re == NULL) {
|
|
326
|
514 return NGX_CONF_ERROR;
|
|
|
515 }
|
|
|
516
|
|
|
517 if (regex) {
|
|
358
|
518 re->regex = regex;
|
|
|
519 re->name = name->data;
|
|
326
|
520
|
|
|
521 return NGX_CONF_OK;
|
|
|
522 }
|
|
|
523
|
|
|
524 err.len = NGX_MAX_CONF_ERRSTR;
|
|
|
525 err.data = errstr;
|
|
|
526
|
|
|
527 name->len--;
|
|
|
528 name->data++;
|
|
|
529
|
|
358
|
530 re->regex = ngx_regex_compile(name, NGX_REGEX_CASELESS, cf->pool, &err);
|
|
326
|
531
|
|
358
|
532 if (re->regex == NULL) {
|
|
326
|
533 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s", err.data);
|
|
|
534 return NGX_CONF_ERROR;
|
|
|
535 }
|
|
|
536
|
|
358
|
537 re->name = name->data;
|
|
326
|
538
|
|
|
539 return NGX_CONF_OK;
|
|
|
540
|
|
|
541 #else
|
|
|
542
|
|
|
543 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
544 "the using of the regex \"%V\" requires PCRE library",
|
|
|
545 name);
|
|
|
546
|
|
|
547 return NGX_CONF_ERROR;
|
|
|
548
|
|
|
549 #endif
|
|
|
550 }
|
|
|
551
|
|
|
552
|
|
142
|
553 static int ngx_libc_cdecl
|
|
|
554 ngx_http_cmp_referer_wildcards(const void *one, const void *two)
|
|
|
555 {
|
|
|
556 ngx_hash_key_t *first, *second;
|
|
|
557
|
|
|
558 first = (ngx_hash_key_t *) one;
|
|
|
559 second = (ngx_hash_key_t *) two;
|
|
|
560
|
|
|
561 return ngx_strcmp(first->key.data, second->key.data);
|
|
|
562 }
|
