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<?xml version="1.0" encoding="iso-8859-2"?>
<!-- EN-Revision: 1.18 Maintainer: goba Status: ready -->
<chapter id="features.safe-mode">
<title>Safe Mode</title>
<para>
A safe mode egy prblkozs a megosztott szerverek biztonsgi
problminak megoldsra. Architektrlisan nem korrekt, hogy
ezt a problmt a PHP szintjn prbljuk megoldani, de mivel
a tbbi alternatva a webszerver s opercis rendszer szinteken
nem igazn hasznlhat, sokan - klnsen az internetszolgltatk -
a safe mode-ot hasznljk egyelre.
</para>
<para>
A safe mode mkdst befolysol belltsok:
<programlisting role="ini">
<![CDATA[
safe_mode = Off
open_basedir =
safe_mode_exec_dir =
safe_mode_allowed_env_vars = PHP_
safe_mode_protected_env_vars = LD_LIBRARY_PATH
disable_fnctions =
]]>
</programlisting>
</para>
<para>
Ha a <link linkend="ini.safe-mode">safe_mode</link>
bellts be van kapcsolva, a PHP ellenrzi, hogy az aktulisan
fut szkript tulajdonosa megegyezik-e a kezelsre megnyitand
file tulajdonosval. Pldul:
<programlisting role="ls">
<![CDATA[
-rw-rw-r-- 1 rasmus rasmus 33 Jul 1 19:20 script.php
-rw-r--r-- 1 root root 1116 May 26 18:01 /etc/passwd
]]>
</programlisting>
Futtatva ezt a script.php programot:
<programlisting role="php">
<![CDATA[
<?php
readfile('/etc/passwd');
?>
]]>
</programlisting>
a kvetkez hibt kapod, ha a safe mode be van kapcsolva:
<screen>
<![CDATA[
Warning: SAFE MODE Restriction in effect. The script whose uid is 500 is not
allowed to access /etc/passwd owned by uid 0 in /docroot/script.php on line 2
]]>
</screen>
</para>
<para>
Ha a <link linkend="ini.safe-mode">safe_mode</link> helyett
egy <link linkend="ini.open-basedir">open_basedir</link>
knyvtrat lltasz be, akkor minden engedlyezett file
mvelet erre a knyvtrra korltozdik. Pldul (Apache
httpd.conf plda):
<programlisting role="ini">
<![CDATA[
<Directory /docroot>
php_admin_value open_basedir /docroot
</Directory>
]]>
</programlisting>
Ha a fenti script.php programot futtatod, ezzel az open_basedir
belltssal, akkor a kvetkez eredmnyt kapod:
<screen>
<![CDATA[
Warning: open_basedir restriction in effect. File is in wrong directory in
/docroot/script.php on line 2
]]>
</screen>
</para>
<para>
Le tudsz tiltani klnbz fggvnyeket akr egyenknt is.
Ha hozzadod ezt a php.ini llomnyodhoz:
<programlisting role="ini">
<![CDATA[
disable_functions readfile,system
]]>
</programlisting>
A kvetkez hibt kapod:
<screen>
<![CDATA[
Warning: readfile() has been disabled for security reasons in
/docroot/script.php on line 2
]]>
</screen>
</para>
<sect1 id="features.safe-mode.functions">
<title>A safe mode hasznlatakor tiltott/korltozott fggvnyek</title>
<para>
Ez mg valsznleg nem teljes, s nem korrekt listja a
fggvnyeknek, amiket a
<link linkend="features.safe-mode">safe mode</link> korltoz.
<table>
<title>Safe modeban korltozott fggvnyek</title>
<tgroup cols="2">
<thead>
<row>
<entry>Fggvny</entry>
<entry>Korltozs</entry>
</row>
</thead>
<tbody>
<row>
<entry><function>dbmopen</function></entry>
<entry>&sm.uidcheck;</entry>
</row>
<row>
<entry><function>dbase_open</function></entry>
<entry>&sm.uidcheck;</entry>
</row>
<row>
<entry><function>filepro</function></entry>
<entry>&sm.uidcheck;</entry>
</row>
<row>
<entry><function>filepro_rowcount</function></entry>
<entry>&sm.uidcheck;</entry>
</row>
<row>
<entry><function>filepro_retrieve</function></entry>
<entry>&sm.uidcheck;</entry>
</row>
<row>
<entry><function>ifx_*</function></entry>
<entry>sql_safe_mode megktsek, (!= safe mode)</entry>
</row>
<row>
<entry><function>ingres_*</function></entry>
<entry>sql_safe_mode megktsek, (!= safe mode)</entry>
</row>
<row>
<entry><function>mysql_*</function></entry>
<entry>sql_safe_mode megktsek, (!= safe mode)</entry>
</row>
<row>
<entry><function>pg_loimport</function></entry>
<entry>&sm.uidcheck;</entry>
</row>
<row>
<entry><function>posix_mkfifo</function></entry>
<entry>&sm.uidcheck.dir;</entry>
</row>
<row>
<entry><function>putenv</function></entry>
<entry>Alkalmazkodik a safe_mode_protected_env_vars s
safe_mode_allowed_env_vars ini belltsokhoz.
Lsd mg a <function>putenv</function> lerst</entry>
</row>
<row>
<entry><function>move_uploaded_file</function></entry>
<entry>&sm.uidcheck;</entry>
</row>
<row>
<entry><function>chdir</function></entry>
<entry>&sm.uidcheck.dir;</entry>
</row>
<row>
<entry><function>dl</function></entry>
<entry>&sm.disabled;</entry>
</row>
<row>
<entry><link linkend="language.operators.execution">vgrehajt opertor</link></entry>
<entry>&sm.disabled;</entry>
</row>
<row>
<entry><function>shell_exec</function> (a vgrehajt opertor fggvny megfelelje)</entry>
<entry>&sm.disabled;</entry>
</row>
<row>
<entry><function>exec</function></entry>
<entry>Futtathat llomnyok vgrehajtsra csak a
<link linkend="ini.safe-mode-exec-dir">safe_mode_exec_dir</link>
knyvtron bell van lehetsg. Praktikus okok miatt nem lehetsges
<literal>..</literal> komponenst elhelyeni a futtatand program
elrsi tjban.
</entry>
</row>
<row>
<entry><function>system</function></entry>
<entry>Futtathat llomnyok vgrehajtsra csak a
<link linkend="ini.safe-mode-exec-dir">safe_mode_exec_dir</link>
knyvtron bell van lehetsg. Praktikus okok miatt nem lehetsges
<literal>..</literal> komponenst elhelyeni a futtatand program
elrsi tjban.
</entry>
</row>
<row>
<entry><function>passthru</function></entry>
<entry>Futtathat llomnyok vgrehajtsra csak a
<link linkend="ini.safe-mode-exec-dir">safe_mode_exec_dir</link>
knyvtron bell van lehetsg. Praktikus okok miatt nem lehetsges
<literal>..</literal> komponenst elhelyeni a futtatand program
elrsi tjban.
</entry>
</row>
<row>
<entry><function>popen</function></entry>
<entry>Futtathat llomnyok vgrehajtsra csak a
<link linkend="ini.safe-mode-exec-dir">safe_mode_exec_dir</link>
knyvtron bell van lehetsg. Praktikus okok miatt nem lehetsges
<literal>..</literal> komponenst elhelyeni a futtatand program
elrsi tjban.
</entry>
</row>
<row>
<entry><function>mkdir</function></entry>
<entry>&sm.uidcheck.dir;</entry>
</row>
<row>
<entry><function>rmdir</function></entry>
<entry>&sm.uidcheck;</entry>
</row>
<row>
<entry><function>rename</function></entry>
<entry>&sm.uidcheck; &sm.uidcheck.dir; <!-- on the old name only, it seems --></entry>
</row>
<row>
<entry><function>unlink</function></entry>
<entry>&sm.uidcheck; &sm.uidcheck.dir;</entry>
</row>
<row>
<entry><function>copy</function></entry>
<entry>&sm.uidcheck; &sm.uidcheck.dir; (a
<parameter>source</parameter> s
<parameter>target</parameter> paramterekre)</entry>
</row>
<row>
<entry><function>chgrp</function></entry>
<entry>&sm.uidcheck;</entry>
</row>
<row>
<entry><function>chown</function></entry>
<entry>&sm.uidcheck;</entry>
</row>
<row>
<entry><function>chmod</function></entry>
<entry>&sm.uidcheck; Radsul nem llthatod t a SUID, SGID s sticky biteket</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; (csak a cl ellenrztt)</entry>
</row>
<row>
<entry><function>link</function></entry>
<entry>&sm.uidcheck; &sm.uidcheck.dir; (csak a cl ellenrztt)</entry>
</row>
<row>
<entry><function>ob_gzhandler</function></entry>
<entry>&sm.uidcheck;</entry>
</row>
<row>
<entry><function>getallheaders</function></entry>
<entry>Safe modeban, semmilyen 'authorization' (nem kisbet/nagybet rzkeny)
kezdet fejlc sem kerl visszaadsra. Figyelem: ez nem mkdik megfelelen
a <function>getallheaders</function> AOL szerveres megvalstsban.</entry>
</row>
<row>
<entry>Minden fggvny, ami a
<filename>php4/main/fopen_wrappers.c</filename> funkcikat hasznlja.
</entry>
<entry>??</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
</sect1>
</chapter>
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