File permisson Linux server using PHP

bala_god

Hi,
I am creating a folder in Linux server through coding.
for example mkdir('upload',777); But it's not creating with this file permission ,
also i try to change that folder permission(upload) through FTP. It's not changing "operation denied " error is coming.

But if i create any folder through FTP then i can change the file permission it's working.

I have to know How can i create and change filel permission through coding in PHP.
I feel setting that folder owner,group, is problem
Please any one help me how to solve this one.

shu

To be able to change file/directory permission through PHP, you first need to know what user/group the web-server is running as. By default, I believe Apache runs as httpd:httpd (user/group).

So, the location where you want to modify or create files/directories will have to allow either the user httpd or the group httpd read and write permission. An easy solution is to assign this location to be owned by the user/group httpd:httpd, e.g. chown -R httpd:httpd /directory-location/.

This will allow the web-server to create files and directories, as well as changing their permissions through PHP later on. If yo want to set up some default permission for file/directory creation, then you need to set the creation umask in some login scripts, such as bashrc; e.g.: umask 022, which will create files and directories with permission of 755 (the inverse).

The trouble I see with the umask is that the user has to login for it to take affect, and since the web-server doesn't log in, this kinda nullifies it use. One way to solve this problem is to specify the umask in the global log in file; but this can create unwanted side effects for other users.

Not sure if this help you or confuse you further, either way, good luck...

msimonds

I believe that you can do something like shell_exec to change the permissions on a created file, if it is the same user

check it out > http://us3.php.net/shell_exec

MarkR

Firstly, you should learn how Unix permissions work.

After you've done that, log on to the shell, use various unix commands (hint: ls -l) to determine what they currently are, and make the appropriate changes interactively.

Neither FTP nor PHP should be used to change permissions. Just set them in the shell.

No shell access? Simple - Get a decent hosting provider.

Mark

bradgrafelman

bala_god wrote:
for example mkdir('upload',777);

I believe you're looking to use 0777 instead of 777. Why? Read the manual for [man]mkdir/man where it talks about the mode parameter.

In fact, while you're there, note how it mentions that the mode is "also modified by the current umask, which you can change using [man]umask/man."

bala_god

I am creating folder mkdir("up",0777); but copy the file in that folder
below warning is coming.

Warning: copy() [function.copy]: SAFE MODE Restriction in effect. The script whose uid is 10001 is not allowed to access /var/www/vhosts/askbabu.com/httpdocs/bala/im/up owned by uid 48 in /var/www/vhosts/askbabu.com/httpdocs/bala/upload.php on line 35

i try to change ini_set('safe_mode',0);
It's not working
How can i proceed.

bala_god

Iadded httpd.conf file in im directory,But it's not working any other way to change safe_mode Off

Safemod off for this directory

safe_mode is Off in php.ini to write permisson

bradgrafelman

bala_god wrote:
Iadded httpd.conf file in im directory

Well... that probably won't do anything at all. For one thing, to change Apache configurations, you'd need a .htaccess file, not httpd.conf (unless your sysadmin has changed this).

Then again, don't bother changing this because if you'll look in the appendix, you'll find that the safe_mode directive can only be modified in the php.ini file or the httpd.conf file (the main Apache config file - not a per-directory .htaccess file).

In other words, contact your host to see how you can turn this feature off (if the host will even allow you to do so).