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annotate xml/en/docs/http/ngx_http_referer_module.xml @ 580:be54c443235a

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Added copyright markers to documentation sources.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 10 Jul 2012 12:59:42 +0000
parents 6520338cdf0a
children 764fbac1b8b4
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1 <?xml version="1.0"?>
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2
580
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3 <!--
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4 Copyright (C) Igor Sysoev
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Module ngx_http_referer_module"
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11 link="/en/docs/http/ngx_http_referer_module.html"
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12 lang="en">
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13
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14 <section id="summary">
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15
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16 <para>
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17 The <literal>ngx_http_referer_module</literal> module allows to block
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18 access to a site for requests with invalid values in the
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19 <header>Referer</header> header field.
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20 It should be kept in mind that fabricating a request with an appropriate
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21 <header>Referer</header> field value is quite easy, and so the intended
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22 purpose of this module is not to block such requests thoroughly but to block
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23 the mass flow of requests sent by regular browsers.
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24 It should also be taken into consideration that regular browsers may
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25 not send the <header>Referer</header> field even for valid requests.
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26 </para>
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27
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28 </section>
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29
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30
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31 <section id="example" name="Example Configuration">
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32
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33 <para>
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34 <example>
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35 valid_referers none blocked server_names
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36 *.example.com example.* www.example.org/galleries/
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37 ~\.google\.;
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38
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39 if ($invalid_referer) {
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40 return 403;
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41 }
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42 </example>
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43 </para>
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44
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45 </section>
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46
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47
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48 <section id="directives" name="Directives">
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49
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50 <directive name="referer_hash_bucket_size">
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51 <syntax><value>size</value></syntax>
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52 <default>64</default>
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53 <context>server</context>
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54 <context>location</context>
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55 <appeared-in>1.0.5</appeared-in>
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56
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57 <para>
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58 Sets the bucket size for the valid referers hash tables.
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59 For more information, please refer to
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60 <link doc="../hash.xml">Setting Up Hashes</link>.
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61 </para>
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62
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63 </directive>
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64
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65
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66 <directive name="referer_hash_max_size">
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67 <syntax><value>size</value></syntax>
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68 <default>2048</default>
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69 <context>server</context>
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70 <context>location</context>
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71 <appeared-in>1.0.5</appeared-in>
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72
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73 <para>
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74 Sets the maximum <value>size</value> of the valid referers hash tables.
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75 For more information, please refer to
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76 <link doc="../hash.xml">Setting Up Hashes</link>.
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77 </para>
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78
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79 </directive>
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80
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81
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82 <directive name="valid_referers">
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83 <syntax>
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84 <literal>none</literal> |
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85 <literal>blocked</literal> |
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86 <literal>server_names</literal> |
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87 <value>string</value>
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88 ...</syntax>
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89 <default/>
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90 <context>server</context>
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91 <context>location</context>
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92
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93 <para>
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94 Specifies values of the <header>Referer</header> request header field
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95 that will cause the embedded variable <var>$invalid_referer</var> to
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96 be set to an empty string.
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97 Otherwise, the variable will be set to “<literal>1</literal>”.
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98 Search for a match is case-insensitive.
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99 </para>
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100
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101 <para>
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102 Parameters can be as follows:
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103 <list type="tag">
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104
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105 <tag-name><literal>none</literal></tag-name>
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106 <tag-desc>
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107 the <header>Referer</header> field is missing in the request header;
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108 </tag-desc>
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109
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110 <tag-name><literal>blocked</literal></tag-name>
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111 <tag-desc>
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112 the <header>Referer</header> field is present in the request header,
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113 but its value was deleted by a firewall or proxy server;
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114 such values are strings that do not start from
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115 “<literal>http://</literal>” or “<literal>https://</literal>”;
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116 </tag-desc>
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117
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118 <tag-name><literal>server_names</literal></tag-name>
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119 <tag-desc>
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120 the <header>Referer</header> request header field contains
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121 one of the server names;
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122 </tag-desc>
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123
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124 <tag-name>arbitrary string</tag-name>
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125 <tag-desc>
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126 defines a server name and an optional URI prefix.
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127 A server name can have an “<literal>*</literal>” at the beginning or end.
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128 When checking, the server’s port in the <header>Referer</header> field
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129 is ignored;
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130 </tag-desc>
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131
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132 <tag-name>regular expression</tag-name>
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133 <tag-desc>
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134 the first symbol should be a “<literal>~</literal>”.
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135 It should be noted that an expression will be matched against
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136 the text starting after the “<literal>http://</literal>”
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137 or “<literal>https://</literal>”.
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138 </tag-desc>
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139
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140 </list>
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141 </para>
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142
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143 <para>
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144 Example:
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145 <example>
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146 valid_referers none blocked server_names
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147 *.example.com example.* www.example.org/galleries/
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148 ~\.google\.;
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149 </example>
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150 </para>
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151
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152 </directive>
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153
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154 </section>
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155
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156 </module>