Edit report at https://bugs.php.net/bug.php?id=52624&edit=1
ID: 52624
Updated by: fel...@php.net
Reported by: hirad dot navid at t-systems dot at
-Summary: tempnam() in SAFE Mode
+Summary: tempnam() by-pass open_basedir with inexistent
directory
-Status: Open
+Status: Closed
Type: Bug
Package: Unknown/Other Function
Operating System: RHEL 5
PHP Version: 5.2.14
-Assigned To:
+Assigned To: felipe
Block user comment: N
Private report: N
New Comment:
This bug has been fixed in SVN.
Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
For Windows:
http://windows.php.net/snapshots/
Thank you for the report, and for helping us make PHP better.
Previous Comments:
------------------------------------------------------------------------
[2011-11-15 16:59:49] fel...@php.net
Automatic comment from SVN on behalf of felipe
Revision: http://svn.php.net/viewvc/?view=revision&revision=319255
Log: - Fixed bug #52624 (tempnam() by-pass open_basedir with inexistent
directory)
------------------------------------------------------------------------
[2011-05-10 15:19:33] alexis dot olivier at unicaen dot fr
Hello everybody,
We got the same case with open_basedir restriction.
The users have no access to /tmp (they have their own tmp dir). When calling
tempnam('/tmp', 'tempname'), The open_basedir restriction takes effect and
creation of the file is forbidden.
But, when calling tempnam('path_that_doesnt_exist', 'tempname'), the function
takes /tmp in fallback and file is created (overriding the open_basedir
restriction). The file can't be written (open_basedir restriction), but this
bug can be used to overflow tmp directory.
I think it lacks a test in the function to protect from writing out of
open_basedir restriction.
Test script:
------------
With open_basedir not including /tmp :
<?php
// This gives a warning
echo tempnam("/tmp", "prefix_");
// This creates a file in /tmp
echo tempnam("directory_that_not_exists", "prefix_");
?>
------------------------------------------------------------------------
[2010-08-17 14:39:52] hirad dot navid at t-systems dot at
Description:
------------
Dear php Team,
We are using php 5.2.13 and Safe_mod is ON.
we have a problem using tempnam, at first we had tempnam('',tempfile);
This did not work - error "can not access /tmp
Later I investigated and have written the testscript and have following
behavior. Attention script must be owned by non root user
the script with 7th line $tmp_name = tempnam ( 'tmp', 'tempname' ); works fine
also with safe_mode
when i change it to $tmp_name = tempnam ( '/tmp', 'tempname' ); a safe_mode
restriction takes effect (the one with compares UID/GID and puts out
Warning: tempnam() [function.tempnam]: SAFE MODE Restriction in effect. The
script whose uid/gid is 506/506 is not allowed to access /tmp owned by uid/gid
0/0 in /home/httpd/html/default/tempfile.php on line 7
but why does it work without the beginning '/'?
Can you clarify this behavior please? and another issuse is that when i try
with $tmp_name = tempnam ( '/tmp', 'tempname' ); it does not make a diference
putting /tmp to openbasedir or safe_mode_includedir it dies not work.
I have also read the changelog and have found that since PHP 5.2.12 some issues
with tempname and safe_mode have been fixed - there was a bug that tempnam
ignores safe_mode. And this correct because i tested with php 5.2.11 and it
worked with /tmp also. Can you tell me ehat exactly is changed saince version
5.2.12?
Test script:
---------------
<?PHP
$xx = sys_get_temp_dir();
echo $xx . '<br>';
for ( $x = 0; $x <= 5; $x++ )
{
$tmp_name = tempnam ( 'tmp', 'tempname' );
echo $tmp_name . '<br>';
}
$str = 'standing in a tempfile';
$tmp_file = fopen ( $tmp_name, 'w' );
fputs ( $tmp_file, $str );
fclose ( $tmp_file );
$fp = fopen ( $tmp_name, 'r' );
$str = fgets ( $fp, 50 );
fclose ( $fp );
echo $str;
?>
Expected result:
----------------
script above works fine also in safe mode change 7th line from
$tmp_name = tempnam ( 'tmp', 'tempname' );
to
$tmp_name = tempnam ( '/tmp', 'tempname' ); bringe a safe_mode restriction
which is also ok, but why does it work without / and why does it not make a
diference putting /tmp to openbasedir or safe_mode_include_dir
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=52624&edit=1
