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I need some help setting the correct permissions or ownership of the apache document root. Here is what I need:

  • different websites stored in /var/www/html/<site>
  • two users should update/manage the websites through ssh
  • ownership should be different than the apache user (for security)

How can I do this? At the moment all files are world-writeable, which isn't good. The server runs CentOS 5.5

Thanks

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For a more detailed answer with other options for securing a docroot, see serverfault.com/questions/357108/… –  Quinn Comendant Jul 6 '13 at 15:01

2 Answers 2

up vote 10 down vote accepted

Create a new group

groupadd webadmin

Add your users to the group

usermod -a -G webadmin user1
usermod -a -G webadmin user2

Change ownership of the sites directory

chown root:webadmin /var/www/html/

Change permissions of the sites directory

chmod 2775 /var/www/html/ -R

Now anybody can read the files (including the apache user) but only root and webadmin can modify their contents.

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That looks good. But what happens if a user creates new files or copy updated files. Are those permissions applied automatically? Or does he need to chown and chmod everytime? –  Marco Jan 20 '11 at 9:44
    
Copied files maintain permissions/ownership. Default file permissions for new files are handled by the umask command. More info here osr507doc.sco.com/en/OSUserG/_default_perms_new_file.html –  Andy Jan 21 '11 at 10:57
2  
you could make the dir setgid webadmin to help with new files –  covener Jan 22 '11 at 2:48
1  
^ +1. The quick way would be: >> chmod 2775 -R /var/www/html/ –  James Broadhead Jul 19 '11 at 16:24
    
@James ta, updated –  Andy Jul 19 '11 at 17:34

I prefer to mount the partition with -o acl. This allows you to use the setfacl command to give set fine grained permissions on files and folders, instead of only specifying user-group-other permissions.

So put acl to your partition line in /etc/fstab, or remount with mount -o remount,acl /mnt/xy, and then give ownership of your web directory to nobody:nobody. Chmod to 770, and use setfacl to give write permissions only on the folders that need it, eg. give www-data (or the user your webserver runs as) write permissions for the upload folder, and give write permissions to your own user for the whole directory.

mkdir dir
chown nobody:nobody dir
setfacl -m u:www-data:r-x,d:u:www-data:r-x dir
setfacl -m u:www-data:rwx,d:u:www-data:rwx dir/upload
setfacl -m u:youruser:rwx,d:u:youruser:rwx dir

Now nobody can read your files, apart your webserver, and your own user. You can write to every file in the folder, and the webserver can only write into the upload folder.

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