Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_referer_module.xml @ 416:c9c0550465c9
English translation of ngx_http_perl_module.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Wed, 15 Feb 2012 14:45:05 +0000 |
parents | bb51d3e17dd0 |
children | 9913f1d51c07 |
rev | line source |
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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.info/galleries/ |
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32 ~\.google\.; |
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33 |
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34 if ($invalid_referer) { |
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35 return 403; |
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36 } |
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37 </example> |
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38 </para> |
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39 |
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40 </section> |
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41 |
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42 |
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43 <section id="directives" name="Directives"> |
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44 |
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45 <directive name="valid_referers"> |
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46 <syntax> |
364 | 47 <literal>none</literal> | |
48 <literal>blocked</literal> | | |
49 <literal>server_names</literal> | | |
50 <value>string</value> | |
51 ...</syntax> | |
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52 <default/> |
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53 <context>server</context> |
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54 <context>location</context> |
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55 |
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56 <para> |
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57 Specifies values of the <header>Referer</header> request header field |
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58 that will cause the embedded variable <var>$invalid_referer</var> to |
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59 be set to 0. |
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60 </para> |
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61 |
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62 <para> |
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63 Parameters can be as follows: |
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64 <list type="tag"> |
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65 |
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66 <tag-name><literal>none</literal></tag-name> |
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67 <tag-desc> |
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68 the <header>Referer</header> field is missing in the request header; |
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69 </tag-desc> |
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70 |
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71 <tag-name><literal>blocked</literal></tag-name> |
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72 <tag-desc> |
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73 the <header>Referer</header> field is present in the request header, |
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74 but its value was deleted by a firewall or proxy server; |
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75 such values are strings that do not start from |
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76 “<literal>http://</literal>”; |
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77 </tag-desc> |
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78 |
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79 <tag-name><literal>server_names</literal></tag-name> |
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80 <tag-desc> |
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81 the <header>Referer</header> request header field contains |
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82 one of the server names; |
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83 </tag-desc> |
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84 |
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85 <tag-name>arbitrary string</tag-name> |
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86 <tag-desc> |
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87 defines a server name and an optional URI prefix. |
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88 A server name can have an “<literal>*</literal>” at the beginning or end. |
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89 When checking, the server’s port in the <header>Referer</header> field |
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90 is ignored; |
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91 </tag-desc> |
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92 |
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93 <tag-name>regular expression</tag-name> |
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94 <tag-desc> |
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95 the first symbol should be a “<literal>~</literal>”. |
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96 It should be noted that an expression will be matched against |
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97 the text starting after the “<literal>http://</literal>”. |
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98 </tag-desc> |
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99 |
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100 </list> |
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101 </para> |
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102 |
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103 <para> |
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104 Example: |
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105 <example> |
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106 valid_referers none blocked server_names |
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107 *.example.com example.* www.example.info/galleries/ |
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108 ~\.google\.; |
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109 </example> |
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110 </para> |
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111 |
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112 </directive> |
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113 |
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114 </section> |
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115 |
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116 </module> |