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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@272814 c90b9560-bf6c-de11-be94-00142212c4b1
77 lines
2.5 KiB
XML
77 lines
2.5 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.4 $ -->
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<!-- splitted from ./index.xml, last change in rev 1.66 -->
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<chapter xml:id="security.hiding" xmlns="http://docbook.org/ns/docbook">
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<title>Hiding PHP</title>
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<para>
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In general, security by obscurity is one of the weakest forms of security.
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But in some cases, every little bit of extra security is desirable.
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</para>
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<para>
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A few simple techniques can help to hide PHP, possibly slowing
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down an attacker who is attempting to discover weaknesses in your
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system. By setting expose_php to <literal>off</literal> in your
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&php.ini; file, you reduce the amount of information available to them.
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</para>
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<para>
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Another tactic is to configure web servers such as apache to
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parse different filetypes through PHP, either with an &htaccess;
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directive, or in the apache configuration file itself. You can
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then use misleading file extensions:
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<example>
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<title>Hiding PHP as another language</title>
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<programlisting role="apache-conf">
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<![CDATA[
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# Make PHP code look like other code types
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AddType application/x-httpd-php .asp .py .pl
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]]>
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</programlisting>
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</example>
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Or obscure it completely:
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<example>
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<title>Using unknown types for PHP extensions</title>
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<programlisting role="apache-conf">
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<![CDATA[
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# Make PHP code look like unknown types
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AddType application/x-httpd-php .bop .foo .133t
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]]>
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</programlisting>
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</example>
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Or hide it as HTML code, which has a slight performance hit because
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all HTML will be parsed through the PHP engine:
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<example>
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<title>Using HTML types for PHP extensions</title>
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<programlisting role="apache-conf">
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<![CDATA[
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# Make all PHP code look like HTML
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AddType application/x-httpd-php .htm .html
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]]>
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</programlisting>
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</example>
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For this to work effectively, you must rename your PHP files with
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the above extensions. While it is a form of security through
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obscurity, it's a minor preventative measure with few drawbacks.
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</para>
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</chapter>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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