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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@323756 c90b9560-bf6c-de11-be94-00142212c4b1
612 lines
21 KiB
XML
612 lines
21 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<chapter xml:id="features.safe-mode" xmlns="http://docbook.org/ns/docbook">
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<title>Safe Mode</title>
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<para>
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The PHP safe mode is an attempt to solve the shared-server security
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problem. It is architecturally incorrect to try to solve this
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problem at the PHP level, but since the alternatives at the web
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server and OS levels aren't very realistic, many people,
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especially ISP's, use safe mode for now.
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</para>
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&warn.deprecated.feature-5-3-0.removed-5-4-0;
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<para>
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<table>
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<title>Changelog for <literal>safe mode</literal></title>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>5.4.0</entry>
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<entry>
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Removed from PHP, and generates a fatal <constant>E_CORE_ERROR</constant>
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level error when enabled.
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</entry>
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</row>
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<row>
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<entry>5.3.0</entry>
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<entry>
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Deprecated, and <constant>E_DEPRECATED</constant> errors were added.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</para>
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<sect1 xml:id="ini.sect.safe-mode">
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<title>Security and Safe Mode</title>
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<para>
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<table>
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<title>Security and Safe Mode Configuration Directives</title>
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<tgroup cols="4">
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<thead>
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<row>
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<entry>&Name;</entry>
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<entry>&Default;</entry>
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<entry>&Changeable;</entry>
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<entry>&Changelog;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><link linkend="ini.safe-mode">safe_mode</link></entry>
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<entry>"0"</entry>
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<entry>PHP_INI_SYSTEM</entry>
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<entry>Removed in PHP 5.4.0.</entry>
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</row>
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<row>
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<entry><link linkend="ini.safe-mode-gid">safe_mode_gid</link></entry>
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<entry>"0"</entry>
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<entry>PHP_INI_SYSTEM</entry>
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<entry>Available since PHP 4.1.0. Removed in PHP 5.4.0.</entry>
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</row>
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<row>
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<entry><link linkend="ini.safe-mode-include-dir">safe_mode_include_dir</link></entry>
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<entry>NULL</entry>
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<entry>PHP_INI_SYSTEM</entry>
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<entry>Available since PHP 4.1.0. Removed in PHP 5.4.0.</entry>
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</row>
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<row>
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<entry><link linkend="ini.safe-mode-exec-dir">safe_mode_exec_dir</link></entry>
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<entry>""</entry>
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<entry>PHP_INI_SYSTEM</entry>
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<entry>Removed in PHP 5.4.0.</entry>
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</row>
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<row>
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<entry><link linkend="ini.safe-mode-allowed-env-vars">safe_mode_allowed_env_vars</link></entry>
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<entry>"PHP_"</entry>
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<entry>PHP_INI_SYSTEM</entry>
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<entry>Removed in PHP 5.4.0.</entry>
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</row>
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<row>
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<entry><link linkend="ini.safe-mode-protected-env-vars">safe_mode_protected_env_vars</link></entry>
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<entry>"LD_LIBRARY_PATH"</entry>
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<entry>PHP_INI_SYSTEM</entry>
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<entry>Removed in PHP 5.4.0.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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&ini.php.constants;
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</para>
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&ini.descriptions.title;
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<para>
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<variablelist>
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<varlistentry xml:id="ini.safe-mode">
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<term>
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<parameter>safe_mode</parameter>
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<type>boolean</type>
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</term>
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<listitem>
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<para>
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Whether to enable PHP's safe mode.
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If PHP is compiled with <literal>--enable-safe-mode</literal> then
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defaults to On, otherwise Off.
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</para>
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&warn.deprecated.feature-5-3-0.removed-5-4-0;
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</listitem>
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</varlistentry>
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<varlistentry xml:id="ini.safe-mode-gid">
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<term>
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<parameter>safe_mode_gid</parameter>
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<type>boolean</type>
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</term>
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<listitem>
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<para>
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By default, Safe Mode does a UID compare check when
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opening files. If you want to relax this to a GID compare,
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then turn on safe_mode_gid.
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Whether to use <literal>UID</literal> (&false;) or
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<literal>GID</literal> (&true;) checking upon file
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access.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry xml:id="ini.safe-mode-include-dir">
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<term>
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<parameter>safe_mode_include_dir</parameter>
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<type>string</type>
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</term>
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<listitem>
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<para>
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<literal>UID</literal>/<literal>GID</literal> checks are bypassed when
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including files from this directory and its subdirectories (directory
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must also be in <link linkend="ini.include-path">include_path</link>
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or full path must including).
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</para>
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<simpara>
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As of PHP 4.2.0, this directive can take a colon (semi-colon on
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Windows) separated path in a fashion similar to the
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<link linkend="ini.include-path">include_path</link> directive,
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rather than just a single directory.
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</simpara>
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<simpara>
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The restriction specified is actually a prefix, not a directory name.
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This means that "<literal>safe_mode_include_dir = /dir/incl</literal>" also allows
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access to "<literal>/dir/include</literal>" and
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"<literal>/dir/incls</literal>" if they exist. When you
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want to restrict access to only the specified directory, end with a
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slash. For example: "<literal>safe_mode_include_dir = /dir/incl/</literal>"
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</simpara>
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<simpara>
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If the value of this directive is empty, no files with different
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<literal>UID</literal>/<literal>GID</literal> can be included in
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PHP 4.2.3 and as of PHP 4.3.3. In earlier versions, all files could be
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included.
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</simpara>
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</listitem>
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</varlistentry>
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<varlistentry xml:id="ini.safe-mode-exec-dir">
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<term>
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<parameter>safe_mode_exec_dir</parameter>
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<type>string</type>
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</term>
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<listitem>
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<para>
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If PHP is used in safe mode, <function>system</function> and the other
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<link linkend="ref.exec">functions executing system programs</link>
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refuse to start programs that are not in this directory.
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You have to use <literal>/</literal> as directory separator on all
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environments including Windows.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry xml:id="ini.safe-mode-allowed-env-vars">
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<term>
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<parameter>safe_mode_allowed_env_vars</parameter>
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<type>string</type>
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</term>
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<listitem>
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<para>
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Setting certain environment variables may be a potential security breach.
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This directive contains a comma-delimited list of prefixes. In Safe Mode,
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the user may only alter environment variables whose names begin with the
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prefixes supplied here. By default, users will only be able to set
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environment variables that begin with <literal>PHP_</literal>
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(e.g. <literal>PHP_FOO=BAR</literal>).
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</para>
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<note>
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<para>
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If this directive is empty, PHP will let the user modify ANY
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environment variable!
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</para>
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</note>
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</listitem>
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</varlistentry>
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<varlistentry xml:id="ini.safe-mode-protected-env-vars">
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<term>
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<parameter>safe_mode_protected_env_vars</parameter>
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<type>string</type>
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</term>
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<listitem>
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<para>
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This directive contains a comma-delimited list of environment
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variables that the end user won't be able to change using
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<function>putenv</function>. These variables will be protected
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even if safe_mode_allowed_env_vars is set to allow to change them.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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See also: <link linkend="ini.open-basedir">open_basedir</link>,
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<link linkend="ini.disable-functions">disable_functions</link>,
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<link linkend="ini.disable-classes">disable_classes</link>,
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<link linkend="ini.register-globals">register_globals</link>,
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<link linkend="ini.display-errors">display_errors</link>, and
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<link linkend="ini.log-errors">log_errors</link>.
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</para>
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<para>
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When <link linkend="ini.safe-mode">safe_mode</link> is on, PHP checks to see
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if the owner of the current script matches the owner of the file to be
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operated on by a file function or its directory. For example:
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<programlisting role="ls">
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<![CDATA[
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-rw-rw-r-- 1 rasmus rasmus 33 Jul 1 19:20 script.php
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-rw-r--r-- 1 root root 1116 May 26 18:01 /etc/passwd
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]]>
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</programlisting>
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Running <filename>script.php</filename>:
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<programlisting role="php">
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<![CDATA[
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<?php
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readfile('/etc/passwd');
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?>
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]]>
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</programlisting>
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results in this error when safe mode is enabled:
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<screen>
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<![CDATA[
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Warning: SAFE MODE Restriction in effect. The script whose uid is 500 is not
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allowed to access /etc/passwd owned by uid 0 in /docroot/script.php on line 2
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]]>
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</screen>
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</para>
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<para>
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However, there may be environments where a strict <literal>UID</literal>
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check is not appropriate and a relaxed <literal>GID</literal> check is
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sufficient. This is supported by means of the <link
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linkend="ini.safe-mode-gid">safe_mode_gid</link> switch. Setting it to
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<literal>On</literal> performs the relaxed <literal>GID</literal> checking,
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setting it to <literal>Off</literal> (the default) performs
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<literal>UID</literal> checking.
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</para>
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<para>
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If instead of <link linkend="ini.safe-mode">safe_mode</link>, you set an
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<link linkend="ini.open-basedir">open_basedir</link> directory then all
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file operations will be limited to files under the specified directory.
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For example (Apache &httpd.conf; example):
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<programlisting role="ini">
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<![CDATA[
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<Directory /docroot>
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php_admin_value open_basedir /docroot
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</Directory>
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]]>
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</programlisting>
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If you run the same <filename>script.php</filename> with this
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<link linkend="ini.open-basedir">open_basedir</link> setting
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then this is the result:
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<screen>
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<![CDATA[
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Warning: open_basedir restriction in effect. File is in wrong directory in
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/docroot/script.php on line 2
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]]>
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</screen>
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</para>
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<para>
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You can also disable individual functions. Note that the
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<link linkend="ini.disable-functions">disable_functions</link>
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directive can not be used outside of the &php.ini; file which means that
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you cannot disable functions on a per-virtualhost or per-directory basis
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in your &httpd.conf; file.
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If we add this to our &php.ini; file:
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<programlisting role="ini">
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<![CDATA[
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disable_functions = readfile,system
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]]>
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</programlisting>
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Then we get this output:
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<screen>
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<![CDATA[
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Warning: readfile() has been disabled for security reasons in
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/docroot/script.php on line 2
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]]>
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</screen>
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</para>
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<warning>
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<para>
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These PHP restrictions are not valid in executed binaries, of course.
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</para>
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</warning>
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</sect1>
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<sect1 xml:id="features.safe-mode.functions">
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<title>Functions restricted/disabled by safe mode</title>
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<para>
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This is a still probably incomplete and possibly incorrect listing
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of the functions limited by
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<link linkend="features.safe-mode">safe mode</link>.
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<!-- TODO: add ¬e.sm.*; to the functions mentioned here.
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That entity should link to this section -->
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<table>
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<title>Safe mode limited functions</title>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>Function</entry>
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<entry>Limitations</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><function>dbmopen</function></entry>
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<entry>&sm.uidcheck;</entry>
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</row>
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<row>
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<entry><function>dbase_open</function></entry>
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<entry>&sm.uidcheck;</entry>
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</row>
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<row>
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<entry><function>filepro</function></entry>
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<entry>&sm.uidcheck;</entry>
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</row>
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<row>
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<entry><function>filepro_rowcount</function></entry>
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<entry>&sm.uidcheck;</entry>
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</row>
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<row>
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<entry><function>filepro_retrieve</function></entry>
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<entry>&sm.uidcheck;</entry>
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</row>
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<row>
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<entry>ifx_*</entry>
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<entry>sql_safe_mode restrictions, (!= safe mode)</entry>
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<!-- TODO: more info on sql-safe-mode -->
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</row>
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<row>
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<entry>ingres_*</entry>
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<entry>sql_safe_mode restrictions, (!= safe mode)</entry>
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<!-- TODO: more info on sql-safe-mode -->
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</row>
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<row>
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<entry>mysql_*</entry>
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<entry>sql_safe_mode restrictions, (!= safe mode)</entry>
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<!-- TODO: more info on sql-safe-mode -->
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</row>
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<row>
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<entry><function>pg_lo_import</function></entry>
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<entry>&sm.uidcheck;</entry>
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<!-- source TODO: there is no PHP-warning for that safe-mode-restriction -->
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</row>
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<row>
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<entry><function>posix_mkfifo</function></entry>
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<entry>&sm.uidcheck.dir;</entry>
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</row>
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<row>
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<entry><function>putenv</function></entry>
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<entry>Obeys the safe_mode_protected_env_vars and
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safe_mode_allowed_env_vars ini-directives. See also the documentation
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on <function>putenv</function></entry>
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<!-- TODO: document those directives in chapters/config.xml -->
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</row>
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<row>
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<entry><function>move_uploaded_file</function></entry>
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<entry>&sm.uidcheck; <!-- TODO: check this --></entry>
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</row>
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<!-- TODO: from here on, add warning to the function itself -->
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<row>
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<entry><function>chdir</function></entry>
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<entry>&sm.uidcheck.dir;</entry>
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</row>
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<row>
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<entry><function>dl</function></entry>
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<entry>&sm.disabled;</entry>
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</row>
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<row>
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<entry><link linkend="language.operators.execution">backtick operator</link></entry>
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<entry>&sm.disabled;</entry>
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</row>
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<row>
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<entry><function>shell_exec</function> (functional equivalent
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of backticks)</entry>
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<entry>&sm.disabled;</entry>
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</row>
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<row>
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<entry><function>exec</function></entry>
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<entry>You can only execute executables within the <link
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linkend="ini.safe-mode-exec-dir">safe_mode_exec_dir</link>.
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For practical reasons it's currently not allowed to have
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<literal>..</literal> components in the path to the executable.
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<function>escapeshellcmd</function> is executed on the argument of this
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function.</entry>
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</row>
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<row>
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<entry><function>system</function></entry>
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<entry>You can only execute executables within the <link
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linkend="ini.safe-mode-exec-dir">safe_mode_exec_dir</link>.
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For practical reasons it's currently not allowed to have
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<literal>..</literal> components in the path to the executable.
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<function>escapeshellcmd</function> is executed on the argument of this
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function.</entry>
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</row>
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<row>
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<entry><function>passthru</function></entry>
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<entry>You can only execute executables within the <link
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linkend="ini.safe-mode-exec-dir">safe_mode_exec_dir</link>.
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For practical reasons it's currently not allowed to have
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<literal>..</literal> components in the path to the executable.
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<function>escapeshellcmd</function> is executed on the argument of this
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function.</entry>
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</row>
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<row>
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<entry><function>popen</function></entry>
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<entry>You can only execute executables within the <link
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linkend="ini.safe-mode-exec-dir">safe_mode_exec_dir</link>.
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For practical reasons it's currently not allowed to have
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<literal>..</literal> components in the path to the executable.
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<function>escapeshellcmd</function> is executed on the argument of this
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function.</entry>
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<!-- TODO: not sure. popen uses a completely different implementation
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Don't know why, don't know whether it's behaving the same -->
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</row>
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<row>
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<entry><function>fopen</function></entry>
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<entry>&sm.uidcheck.dir;</entry>
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</row>
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<row>
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<entry><function>mkdir</function></entry>
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<entry>&sm.uidcheck.dir;</entry>
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</row>
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<row>
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<entry><function>rmdir</function></entry>
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<entry>&sm.uidcheck.dir;</entry>
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</row>
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<row>
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<entry><function>rename</function></entry>
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<entry>&sm.uidcheck; &sm.uidcheck.dir;<!-- on the old name only, it seems. Is rename preventing moving files? --></entry>
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</row>
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<row>
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<entry><function>unlink</function></entry>
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<entry>&sm.uidcheck; &sm.uidcheck.dir;</entry>
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</row>
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<row>
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<entry><function>copy</function></entry>
|
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<entry>&sm.uidcheck; &sm.uidcheck.dir; (on
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<parameter>source</parameter> and
|
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<parameter>target</parameter>)</entry>
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</row>
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<row>
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<entry><function>chgrp</function></entry>
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<entry>&sm.uidcheck;</entry>
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</row>
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<row>
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<entry><function>chown</function></entry>
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<entry>&sm.uidcheck;</entry>
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</row>
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<row>
|
|
<entry><function>chmod</function></entry>
|
|
<entry>&sm.uidcheck; In addition, you cannot
|
|
set the SUID, SGID and sticky bits</entry>
|
|
</row>
|
|
<row>
|
|
<entry><function>touch</function></entry>
|
|
<entry>&sm.uidcheck; &sm.uidcheck.dir;</entry>
|
|
</row>
|
|
<row>
|
|
<entry><function>symlink</function></entry>
|
|
<entry>&sm.uidcheck; &sm.uidcheck.dir; (note: only the target is
|
|
checked)</entry>
|
|
</row>
|
|
<row>
|
|
<entry><function>link</function></entry>
|
|
<entry>&sm.uidcheck; &sm.uidcheck.dir; (note: only the target is
|
|
checked)</entry>
|
|
</row>
|
|
<row>
|
|
<entry><function>apache_request_headers</function></entry>
|
|
<entry>In safe mode, headers beginning with <literal>authorization</literal>
|
|
(case-insensitive) will not be returned.</entry>
|
|
</row>
|
|
<row>
|
|
<entry><function>header</function></entry>
|
|
<entry>In safe mode, the uid of the script is added to the
|
|
<literal>realm</literal> part of the
|
|
<literal>WWW-Authenticate</literal> header if you set this
|
|
header (used for HTTP Authentication).</entry>
|
|
</row>
|
|
<row>
|
|
<entry><link linkend="features.http-auth">PHP_AUTH variables</link></entry>
|
|
<entry>
|
|
In safe mode, the variables <varname>PHP_AUTH_USER</varname>,
|
|
<varname>PHP_AUTH_PW</varname>, and <varname>AUTH_TYPE</varname>
|
|
are not available in <varname>$_SERVER</varname>. Regardless, you
|
|
can still use <varname>REMOTE_USER</varname> for the USER.
|
|
(note: only affected since PHP 4.3.0)
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry>
|
|
<function>highlight_file</function>,
|
|
<function>show_source</function>
|
|
</entry>
|
|
<entry>
|
|
&sm.uidcheck; &sm.uidcheck.dir; (note: only affected since PHP 4.2.1)
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry>
|
|
<function>parse_ini_file</function>
|
|
</entry>
|
|
<entry>
|
|
&sm.uidcheck; &sm.uidcheck.dir; (note: only affected since PHP 4.2.1)
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry>
|
|
<function>set_time_limit</function>
|
|
</entry>
|
|
<entry>
|
|
Has no effect when PHP is running in &safemode;.
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry>
|
|
<link linkend="ini.max-execution-time">max_execution_time</link>
|
|
</entry>
|
|
<entry>
|
|
Has no effect when PHP is running in &safemode;.
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry>
|
|
<function>mail</function>
|
|
</entry>
|
|
<entry>
|
|
In safe mode, the fifth parameter is disabled. (note: only affected since PHP 4.2.3)
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry>
|
|
<function>session_start</function>
|
|
</entry>
|
|
<entry>
|
|
The owner of a script must be the same as owner of a <link
|
|
linkend="ini.session.save-path">session.save_path</link> directory if
|
|
the default <literal>files</literal> <link
|
|
linkend="ini.session.save-handler">session.save_handler</link> is
|
|
used.
|
|
</entry>
|
|
</row>
|
|
<row>
|
|
<entry>
|
|
All filesystem and stream functions.
|
|
</entry>
|
|
<entry>
|
|
&sm.uidcheck; &sm.uidcheck.dir; (see the <link
|
|
linkend="ini.safe-mode-include-dir">safe_mode_include_dir</link>
|
|
&php.ini; option.
|
|
</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
</para>
|
|
</sect1>
|
|
|
|
</chapter>
|
|
|
|
<!-- Keep this comment at the end of the file
|
|
Local variables:
|
|
mode: sgml
|
|
sgml-omittag:t
|
|
sgml-shorttag:t
|
|
sgml-minimize-attributes:nil
|
|
sgml-always-quote-attributes:t
|
|
sgml-indent-step:1
|
|
sgml-indent-data:t
|
|
indent-tabs-mode:nil
|
|
sgml-parent-document:nil
|
|
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
|
|
sgml-exposed-tags:nil
|
|
sgml-local-catalogs:nil
|
|
sgml-local-ecat-files:nil
|
|
End:
|
|
vim600: syn=xml fen fdm=syntax fdl=2 si
|
|
vim: et tw=78 syn=sgml
|
|
vi: ts=1 sw=1
|
|
-->
|