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 — ファイルの所有者を変更する
説明
ファイルfilename の所有者を(名前または番号で指定した) ユーザuser に変更しようと試みます。 スーパーユーザのみがファイルの所有者を変更できます。
パラメータ
- filename
-
ファイルへのパス。
- user
-
ユーザ名あるいはユーザ番号。
返り値
成功した場合に TRUE を、失敗した場合に FALSE を返します。
例
例1 シンプルな chown() の例
<?php
// 使用するファイル名とユーザ名
$file_name= "foo.php";
$path = "/home/sites/php.net/public_html/sandbox" . $file_name ;
$user_name = "root";
// ユーザを設定します
chown($path, $user_name);
// 結果を確認します
$stat = stat($path);
print_r(posix_getpwuid($stat['uid']));
?>
上の例の出力は、 たとえば以下のようになります。
array(7) {
["name"]=>
string(13) "php.net"
["passwd"]=>
string(1) "x"
["uid"]=>
int(148864)
["gid"]=>
int(148910)
["gecos"]=>
string(13) "php.net"
["dir"]=>
string(25) "/home/sites/php.net"
["shell"]=>
string(13) "/sbin/nologin"
}
注意
注意: この関数では、 リモートファイル を 使用することはできません。これは、処理されるファイルがサーバの ファイルシステムによりアクセスできる必要があるためです。
注意: セーフモード が有効の場合、PHP は操作を行うファイル／ディレクトリが実行するスクリプトと 同じ UID (所有者)を有しているかどうかを確認します。
add a note
User Contributed Noteschown
rickard at 0x539 dot se
18-Jun-2009 09:04
18-Jun-2009 09:04
Mikevac at yahoo dot com
01-Feb-2008 07:42
01-Feb-2008 07:42
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 04:13
11-Jan-2006 04:13
Simple usage of the chown:
<?php
$file_name= "test";
$path = "/var/www/html/test/" . $file_name ;
$user_name = "root";
chown($path, $user_name);
?>
Jens Vieler
23-May-2005 07:38
23-May-2005 07:38
for some reason i was searching for chown() with an "on this mashine"-unknown userid and found martijn's hint very interesting. the main problem is, that if the numerical uid is used within a variable, it is checked against the /etc/passwd and returns "unknown user". a little note:
use intval(), not inval()! so all in all it is:
chown($path_to_dir,intval($uidnumber));
greg _at_ rhythmicdesign d.o.t com
24-Feb-2004 12:00
24-Feb-2004 12:00
<?php
function recurse_chown_chgrp($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, $gid);
}
}
}
recurse_chown_chgrp ("uploads", "unsider", "unsider") ;
?>
for older versions.. unfortunately, it seems I do not have permission to perform these functions.
Richard Esplin
12-Oct-2003 03:49
12-Oct-2003 03:49
As far as I can tell, PHP's built in functions will not do a recursive chown or chgrp. But it wouldn't be hard to write a function for this. Here is some starter code based on an example written by John Coggeshall which I found at http://www.coggeshall.org :
<?php
function recurse_chown_chgrp($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 03:37
27-Jun-2003 03:37
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 02:28
20-Jun-2003 02:28
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
22-Sep-2000 06:28
22-Sep-2000 06:28
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.