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annotate xml/en/docs/http/ngx_http_referer_module.xml @ 502:6520338cdf0a

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Bring ngx_http_referer_module docs up to date, including: - Documented directives "referer_hash_bucket_size" and "referer_hash_max_size". - Fixed "false" value of the $invalid_referer variable, documented "true" value. - Documented that search for a match of valid referers is case-insensitive.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 24 Apr 2012 06:21:34 +0000
parents 9913f1d51c07
children be54c443235a
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1 <?xml version="1.0"?>
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2
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3 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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4
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5 <module name="Module ngx_http_referer_module"
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6 link="/en/docs/http/ngx_http_referer_module.html"
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7 lang="en">
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8
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9 <section id="summary">
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10
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11 <para>
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12 The <literal>ngx_http_referer_module</literal> module allows to block
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13 access to a site for requests with invalid values in the
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14 <header>Referer</header> header field.
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15 It should be kept in mind that fabricating a request with an appropriate
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16 <header>Referer</header> field value is quite easy, and so the intended
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17 purpose of this module is not to block such requests thoroughly but to block
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18 the mass flow of requests sent by regular browsers.
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19 It should also be taken into consideration that regular browsers may
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20 not send the <header>Referer</header> field even for valid requests.
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21 </para>
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22
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23 </section>
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24
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25
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26 <section id="example" name="Example Configuration">
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27
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28 <para>
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29 <example>
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30 valid_referers none blocked server_names
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31 *.example.com example.* www.example.org/galleries/
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32 ~\.google\.;
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33
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34 if ($invalid_referer) {
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35 return 403;
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36 }
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37 </example>
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38 </para>
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39
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40 </section>
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41
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42
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43 <section id="directives" name="Directives">
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44
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45 <directive name="referer_hash_bucket_size">
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46 <syntax><value>size</value></syntax>
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47 <default>64</default>
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48 <context>server</context>
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49 <context>location</context>
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50 <appeared-in>1.0.5</appeared-in>
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51
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52 <para>
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53 Sets the bucket size for the valid referers hash tables.
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54 For more information, please refer to
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55 <link doc="../hash.xml">Setting Up Hashes</link>.
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56 </para>
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57
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58 </directive>
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59
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60
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61 <directive name="referer_hash_max_size">
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62 <syntax><value>size</value></syntax>
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63 <default>2048</default>
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64 <context>server</context>
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65 <context>location</context>
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66 <appeared-in>1.0.5</appeared-in>
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67
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68 <para>
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69 Sets the maximum <value>size</value> of the valid referers hash tables.
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70 For more information, please refer to
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71 <link doc="../hash.xml">Setting Up Hashes</link>.
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72 </para>
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73
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74 </directive>
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75
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76
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77 <directive name="valid_referers">
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78 <syntax>
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79 <literal>none</literal> |
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80 <literal>blocked</literal> |
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81 <literal>server_names</literal> |
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82 <value>string</value>
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83 ...</syntax>
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84 <default/>
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85 <context>server</context>
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86 <context>location</context>
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87
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88 <para>
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89 Specifies values of the <header>Referer</header> request header field
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90 that will cause the embedded variable <var>$invalid_referer</var> to
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91 be set to an empty string.
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92 Otherwise, the variable will be set to “<literal>1</literal>”.
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93 Search for a match is case-insensitive.
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94 </para>
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95
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96 <para>
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97 Parameters can be as follows:
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98 <list type="tag">
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99
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100 <tag-name><literal>none</literal></tag-name>
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101 <tag-desc>
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102 the <header>Referer</header> field is missing in the request header;
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103 </tag-desc>
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104
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105 <tag-name><literal>blocked</literal></tag-name>
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106 <tag-desc>
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107 the <header>Referer</header> field is present in the request header,
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108 but its value was deleted by a firewall or proxy server;
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109 such values are strings that do not start from
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110 “<literal>http://</literal>” or “<literal>https://</literal>”;
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111 </tag-desc>
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112
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113 <tag-name><literal>server_names</literal></tag-name>
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114 <tag-desc>
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115 the <header>Referer</header> request header field contains
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116 one of the server names;
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117 </tag-desc>
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118
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119 <tag-name>arbitrary string</tag-name>
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120 <tag-desc>
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121 defines a server name and an optional URI prefix.
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122 A server name can have an “<literal>*</literal>” at the beginning or end.
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123 When checking, the server’s port in the <header>Referer</header> field
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124 is ignored;
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125 </tag-desc>
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126
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127 <tag-name>regular expression</tag-name>
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128 <tag-desc>
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129 the first symbol should be a “<literal>~</literal>”.
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130 It should be noted that an expression will be matched against
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131 the text starting after the “<literal>http://</literal>”
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132 or “<literal>https://</literal>”.
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133 </tag-desc>
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134
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135 </list>
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136 </para>
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137
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138 <para>
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139 Example:
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140 <example>
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141 valid_referers none blocked server_names
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142 *.example.com example.* www.example.org/galleries/
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143 ~\.google\.;
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144 </example>
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145 </para>
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146
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147 </directive>
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148
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149 </section>
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150
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151 </module>