chmod
For most modern Linux systems your apache user should not be run as root, and in order to change the ownership of a file or directory, you need to be root. To get around this problem you can use sudo, but be careful with what permissions you give. Here is an example which is working for me:
www-data ALL = NOPASSWD: /bin/chown 1[1-9][0-9][0-9]\:1[1-9][0-9][0-9] /home/www/[a-zA-Z0-9]*
This allows the apache server to change ownership of files in /home/www with name containing a-z, A-Z or numbers (note: no subdirectories). The only valid input of userid is a four digit numeric id, between 1100 and 1999.
Hope this helps.
chown
(PHP 4, PHP 5)
chown — Cambia el propietario del archivo
Descripción
Intenta cambiar el propietario del archivo filename
por el usuario user. Sólo el superusuario puede cambiar el
propietario de un archivo.
Parámetros
-
filename -
Ruta del archivo.
-
user -
Un nombre o número de usuario.
Valores devueltos
Devuelve TRUE en caso de éxito o FALSE en caso de error.
Ejemplos
Ejemplo #1 Uso sencillo de chown()
<?php
// Nombre de archivo y nombre de usuario a utilizar
$nombre_archivo= "foo.php";
$ruta = "/home/sites/php.net/public_html/sandbox/" . $nombre_archivo ;
$nombre_usuario = "root";
// Establece el usuario
chown($ruta, $nombre_usuario);
// Verifica el resultado
$stat = stat($ruta);
print_r(posix_getpwuid($stat['uid']));
?>
El resultado del ejemplo sería algo similar a:
Array
(
[name] => root
[passwd] => x
[uid] => 0
[gid] => 0
[gecos] => root
[dir] => /root
[shell] => /bin/bash
)
Notas
Nota: Esta función no funcionará en ficheros remotos ya que el fichero debe ser accesible vía el sistema de ficheros del servidor para poder ser examinado.
Nota: Cuando safe mode está habilitado, PHP comprueba si los archivos o directorios que va a utilizar tienen el mismo UID (propietario) que el script que está siendo ejecutado.
add a note
User Contributed Notes
chown
rickard at 0x539 dot se
18-Jun-2009 02:04
Mikevac at yahoo dot com
01-Feb-2008 11:42
I've only tested this on Solaris 10 so your mileage may vary.
To allow the apache daemon to change file ownership without being root, add the following line to /etc/system:
set rstchown=0
Reboot the server.
There are security concerns doing this as this modification allows any user to change ownership of their files to anyone else.
Tayfun Bilsel
11-Jan-2006 08:13
Simple usage of the chown:
<?php
$file_name= "test";
$path = "/var/www/html/test/" . $file_name ;
$user_name = "root";
chown($path, $user_name);
?>
Jens Vieler
23-May-2005 12:38
for some reason i was searching for chown() with an "on this mashine"-unknown userid and found martijn's hint very interesting. the main problem is, that if the numerical uid is used within a variable, it is checked against the /etc/passwd and returns "unknown user". a little note:
use intval(), not inval()! so all in all it is:
chown($path_to_dir,intval($uidnumber));
greg _at_ rhythmicdesign d.o.t com
23-Feb-2004 04:00
<?php
function recurse_chown_chgrp($mypath, $uid, $gid)
{
$d = opendir ($mypath) ;
while(($file = readdir($d)) !== false) {
if ($file != "." && $file != "..") {
$typepath = $mypath . "/" . $file ;
//print $typepath. " : " . filetype ($typepath). "<BR>" ;
if (filetype ($typepath) == 'dir') {
recurse_chown_chgrp ($typepath, $uid, $gid);
}
chown($typepath, $uid);
chgrp($typepath, $gid);
}
}
}
recurse_chown_chgrp ("uploads", "unsider", "unsider") ;
?>
for older versions.. unfortunately, it seems I do not have permission to perform these functions.
Richard Esplin
11-Oct-2003 08:49
As far as I can tell, PHP's built in functions will not do a recursive chown or chgrp. But it wouldn't be hard to write a function for this. Here is some starter code based on an example written by John Coggeshall which I found at http://www.coggeshall.org :
<?php
function recurse_chown_chgrp($path2dir, $uid, $gid){
$dir = new dir($path2dir);
while(($file = $dir->read()) !== false) {
if(is_dir($dir->path.$file)) {
recurse_chown_chgrp($dir->path.$file, $uid, $gid);
} else {
chown($file, $uid);
chgrp($file, $gid);
}
}
$dir->close();
}
?>
I have not tested this code (but I think it will work) because for my current needs, a simple exec("chown -r $user.$group $path"); is sufficient. I would need this code if I were not in control of the contents of these variables because they can be dangerous on the command line.
Klaus Zierer
27-Jun-2003 08:37
If you want to chown a symlink, PHP will follow the symlink and change the target file.
If you want to chown the symlink, you have to use shell_exec("/bin/chown user.group symlink");
martijn at sigterm dot nl
20-Jun-2003 07:28
If chown is filled with a variable ( chown ("myfile", $uid) the uid will be looked up through pwget_uid.
So if you need to set a non existing uid use inval($uid).
njs+php at scifi dot squawk dot com
21-Sep-2000 11:28
If you allow sudo execution for chmod by "nobody" (www, webdaemon, httpd, whatever user php is running under)in this manner, it had better be a system on which the owner is able to be root and no one else can run code, else your whole system is compromised. Someone could change the mode of /etc/passwd or the shadow password file.
Other system commands (sudo mount) and so forth are similar.