posix_setuid

(PHP 4, PHP 5, PHP 7)

posix_setuid — Set the UID of the current process

Descrierea

posix_setuid ( int $user_id ) : bool

Set the real user ID of the current process. This is a privileged function that needs appropriate privileges (usually root) on the system to be able to perform this function.

Parametri

user_id: The user id.

Valorile întoarse

Întoarce valoarea true în cazul succesului sau false în cazul eșecului.

Exemple

Example #1 posix_setuid() example

This example will show the current user id and then set it to a different value.


<?php
echo posix_getuid()."\n"; //10001
echo posix_geteuid()."\n"; //10001
posix_setuid(10000);
echo posix_getuid()."\n"; //10000
echo posix_geteuid()."\n"; //10000
?>

A se vedea și

posix_setgid() - Set the GID of the current process
posix_seteuid() - Set the effective UID of the current process
posix_getuid() - Return the real user ID of the current process
posix_geteuid() - Return the effective user ID of the current process

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User Contributed Notes 7 notes

down

Leigh ¶

10 years ago


Note that on unix, if your target user does not have a valid shell, some php functions (eg: tempnam) will not work correctly:

$ grep www-data /etc/passwd
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin

$ cat test.php 
#!/usr/bin/php -q
<?php
    $info=posix_getpwnam("www-data");
    $id=$info["uid"];

    $file=tempnam("/tmp","something");
    print "PRE SetUID: $file\n";

    $SETUID=posix_setuid($id);

    $file=tempnam("/tmp","something");
    print "POST SetUID: $file\n";
?>

$ sudo ./test.php 
PRE SetUID: /tmp/somethingrsb1qZ
POST SetUID:

down

TheWanderer ¶

17 years ago


On many UNIX systems (tested on Debian GNU/Linux), SUID is disabled for scripts and works only for binaries. If you need to setuid, you must use a wrapper binary that runs setuid() php script. Here's an example:

$ nano suexec.cpp
#include <stdlib>
using namespace std;
int main()
{
system("php /home/php/php_user.php");
return 0;
}

$ g++ -o suexec suexec.cpp
$ sudo chown root:root suexec
$ sudo chmod 4755 root

Then we create short PHP script to set process uid (you should already know how to do this). Don't even try to experiment with auto_prepend_file in php.ini, it doesn't work as expected.

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reuben @ nospam me ¶

17 years ago


In response to a note above that advocated the user of system() in a setuid program written in C, this is generally a bad idea for security.  

You should use the standard library calls like execl() instead because system() can be manipulated to execute the wrong thing using the SHELL, IFS and possibly other variables.

down

fm at farhad.ca ¶

17 years ago


When you do a posix_setuid from root to some other users you will not have access to files owned by root according to their permissions. For instance if you change owner of the process and still need to open a file for read or write with 600 permission owned by root you will receive a permission denied.
There are some ways to do this (i.e. a unix socket or tcp daemon etc), but probably the most easiest way is:

Open the file before changing ownership of process, save the file pointer in a global variable and use it after changing ownership. 

For example assume /root/test_file is a file owned by root:root and have a permission of 600 and you are running this script under root. This code will not work:

<?php
// Change ownership of process to nobody
posix_setgid(99);
posix_setuid(99);

$fd = fopen('/root/test_file','a');
fwrite($fd,"some test strings");
fclose();

?>

But this one will work:

<?php
$fd = fopen('/root/test_file','a');

// Change ownership of process to nobody
posix_setgid(99);
posix_setuid(99);

fwrite($fd,"some test strings");
fclose();

?>

Hope this helps some one.

[Tested on CentOS 5 - Linux 2.6.x - PHP 5.2.x]

down

hpaul/at/abo/dot/fi ¶

18 years ago


It seems like this function returns true if you try to change uid to the already active user - even if you aren't root.

Should save you one if-statement in some cases.

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simon at dont-spam-me-pleease dot simonster dot com ¶

22 years ago


Here's some Perl code to run a PHP script setuid. Just put it into a CGI, make that CGI setuid and executable, then call the CGI where you would usually call the PHP script.

#!/usr/local/bin/perl

# Perl wrapper to execute a PHP script setuid
# �2002 Simon Kornblith
# Requires PHP CGI

# Make UID = EUID (so that PHP can run system()s and execs() setuid)
$< = $>;
# Set this to the path, so that we can't get poisoned
$ENV{'PATH'} = "/home/httpd/cgi-bin/ssl/admin";      
# Open the PHP script (must start with !#/usr/local/bin/php or similar and
# be executable
open(STDOUT, "| /home/httpd/cgi-bin/ssl/admin/new.php");
# Write STDIN to PHP script 
print while <STDIN>;

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-1

rjmooney at syr dot edu ¶

21 years ago


For simple operations, you can easily create a privilege-separation mechanism to perform commands that require elevated privileges.

For example, in creating a document repository, I had the need to provide access to certain directory and file operations based on a user's login name.  It's unrealistic and unsecure to provide the web server access to all of the directories that the user may need to access, so I created a setuid() script to perform the required operations for me.

An exerpt from the code demonstrates this:

<?

//
// main.php
//

// Perform a privileged stat()
function privsep_stat($path)
{
        // Call the privilege separation program, ask for a stat of the specified path
        $serialized_result = exec("/path/to/privsep.php stat " . $path, $oa, $return_code);
        if ($return_code != 0)
        {
                return false;
        }

        // Return the unserialized object
        return unserialize($serialized_result);
}

// Get file statistics on a file we don't have access to as the web server user
$st = privsep_stat("/private_directory/private_file");
print_r($st);

?>

privsep.php looks like this:

#!/usr/local/bin/php
<?

//
// privsep.php
//

// Don't allow this script to be run from the web
if (isset($_SERVER['REQUEST_METHOD']))
{
    print "<br>This program is not intended to be run directly from the WWW.\n";
    return 1;
}

// TODO: add your argument validation here

// A stat was requested
if ($argv[1] == "stat")
{
    // Reset the stat() cache
    clearstatcache();

    // Original user ID
    $original_uid = posix_get_uid();

    // Set our real user ID to root
    $success = posix_setuid(0);
    if (!$success)
    {
        print "Error: Cannot setuid().\n";
        return 1;
    }

    // Store the file statistics
    $st = stat($argv[2]);

    // Drop the real UID back to the calling user ID
    $success = posix_setuid($original_uid); 
    if (!$success)
    {
        print "Error: Cannot setuid().\n";
        return 1;
    }

    // Drop the effective UID as well
    $success = posix_seteuid($original_uid); 
    if (!$success)
    {
        print "Error: Cannot seteuid().\n";
        return 1;
    }

    // Serialize the result and print it
    $result = serialize($st);
    print $result;

    // Success!
    return 0;
}
?>

Finally, privsep.php's permissions are configured like this:

# chown root:wheel privsep.php
# chmod 4755 privsep.php

And look like this:

-rwsr-xr-x  1 root      wheel     1000 Nov  1 00:00 privsep.php

It's probably wise to keep privsep.php out of your document root to help mitigate any successful attack. 

This method can be extended for other functions.  Use at your own risk.

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