ID: 24604
Comment by: s9608273 at student dot utwente dot nl
Reported By: timo dot hummel at 4fb dot de
Status: Open
Bug Type: Documentation problem
Operating System: SuSE Linux 8.2 Linux 2.4.19
PHP Version: Irrelevant
New Comment:
Dir 20031228122842 made with function mkdir() (uid/gid : 101:100)
This is the effect when moving uploaded file to this dir.
Warning: move_uploaded_file(): SAFE MODE Restriction in effect. The
script whose uid/gid is 507/507 is not allowed to access
/home/..../uploadedFiles/20031228122842 owned by uid/gid 101/100 in
...
Maybe all file operations can be performed as the user which owns the
script.
Previous Comments:
------------------------------------------------------------------------
[2003-11-11 23:36:49] ndhuyvu at yahoo dot com
drwxrwxrwx 2 32533 bcdt 4096 Oct 23 20:48 10
drwxrwxrwx 2 99 99 4096 Nov 11 22:25 19
drwxrwxrwx 2 99 99 4096 Nov 11 22:32 20
drwxrwxrwx 2 32533 bcdt 4096 Oct 23 20:47 4
drwxrwxrwx 2 32533 bcdt 4096 Nov 5 23:07 5
drwxrwxrwx 2 32533 bcdt 4096 Oct 23 20:47 6
drwxrwxrwx 2 32533 bcdt 4096 Oct 23 20:47 9
FTP LOGIN -> Create Dir -> is OK
drwxrwxrwx 2 32533 bcdt 4096 Oct 23 20:47 9
But :-(
When create Dir in php code
mkdir($datapath.$ID,0777);
or
chmod($datapath.$ID,0777);
mkdir($datapath.$ID,0777);
result:
drwxrwxrwx 2 99 99 4096 Nov 11 22:32 20
------------------------------------------------------------------------
[2003-11-06 12:22:40] timo dot hummel at 4fb dot de
Use cgi-php.
And no such problems at all.
Tell that 99% of all internet hosters. They just won't do it - for
certain reasons. And there will be problems - just read my bug report
again why this is not revelant to cgi-php.
They _NEVER_ do this. Because to change user,
process must be owned by
root. It's mean no security.
Not necessarly. I suggested to change the safe mode logic, not the
creator to create directories.
My opinion - not needed. Just read aboud mod_php.
It's always run as apache user.
Yes, but again: Read my bug report carefully. Try it out yourself. If
you know about how unix and linux systems are setup, you'll quickly
discover why it fails. Also remember: Most providers provide PHP, but
only uploads via FTP. Thus, the user id's with which people upload
files don't match the user id of the webserver in most cases.
File_uploads can working with 'chuid' script, for example.
Most providers also don't do this. What you are recommending here are
workarounds, but not solutions.
Just turn safe_mode OFF and disable system, popen, >exec... functions
Again, Providers turn on SAFE_MODE because they think they make PHP
secure - but in fact, they are disabling file operations via the web
and 3rd party software (i.e. all scripts you can get on the web) pretty
useless.
Or to use plain words:
"Heck, I can create a directory but I cannot write to it afterwards?"
------------------------------------------------------------------------
[2003-11-03 12:55:54] roman at compic dot ee
Use cgi-php.
And no such problems at all.
1.) Modify the SAFE_MODE concept to become consistent.
They _NEVER_ do this. Because to change user, process must be owned by
root. It's mean no security.
2.) Modify the documentation of SAFE_MODE and all related
file/directory
functions that for the proper operation of file and directory
functions,
the owner and executor have to be the same user.
My opinion - not needed. Just read aboud mod_php. It's always run as
apache user.
The above problems are one reason why most PHP content management
systems recommend to turn SAFE_MODE off in order to make file uploads
working.
File_uploads can working with 'chuid' script, for example.
Just turn safe_mode OFF and disable system, popen, exec... functions
------------------------------------------------------------------------
[2003-07-11 08:32:33] timo dot hummel at 4fb dot de
Description:
------------
Hello bug processors,
please read the following bug report carefully, as it makes file and
directory operations completely useless. At the end of this report, you
find recommendations about what we should do.
Take a breath, it's quite a bunch of stuff to read and understand.
Remember that the following is only an example, but which could be
applied to almost every system running PHP with SAFE_MODE and where
scripts need to perform file and directory operations.
As you might all know, providers tend to host multiple domains on a
single machine. In the example, Apache runs as the system user
"wwwrun", and we have a client user which has the system user "client".
We have the following script:
<?php
mkdir("test");
?>
in the htdocs directory of the webserver:
-rw-r--r-- 1 client users 24 test.php
given the fact that the directory where test.php resides is owned by
"client", test.php was called via the web and SAFE_MODE is on, the
following happens:
- the directory "test" will be created
- the directory "test" has the owner "wwwrun"
- any further operations with the directory "test" will fail since
SAFE_MODE is on and don't allow any operations on files and/or
directories not owned by the owner of the script
This introduces another problem:
move_uploaded_file will fail in the above scenario. The htdocs
directory of "client" is writable and owned by "client". If now a file
is uploaded, it is stored in the PHP_TEMP_DIR specified in the php.ini
with the user "wwwrun", thus making "move_uploaded_file" fail if it
should be moved to the htdocs-directory of "client".
The big problem with the SAFE_MODE of PHP is maybe a communications
problem, but I try to propose a few solutions:
1.) Modify the SAFE_MODE concept to become consistent. I.e. if a
directory is created with a script owned by "client", the new directory
should also belong to "client" instead of wwwrun, or SAFE_MODE
shouldn't check the owner of the script, but rather the executor of the
script.
2.) Modify the documentation of SAFE_MODE and all related
file/directory functions that for the proper operation of file and
directory functions, the owner and executor have to be the same user.
3.) Modify the documentation of SAFE_MODE and all related
file/directory functions that for the proper operation of file and
directory functions in a multi-user/single-executor scenario,
safe_mode_gid should be set, including the correct group rights.
The above problems are one reason why most PHP content management
systems recommend to turn SAFE_MODE off in order to make file uploads
working.
The issue was tested with many PHP-Versions on many different systems
(altough I haven't tried PHP 5.0 yet), but I'm looking forward to see
the issue resolved in any way in the future.
best regards,
Timo
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Edit this bug report at http://bugs.php.net/?id=24604&edit=1
