Wordpress

WordPress folder correct permission

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Giving the full access to all wp files to www-data user (which is in this case the web server user) can be dangerous. So rather do NOT do this:

chown www-data:www-data -R *
It can be useful however in the moment when you're installing or upgrading WordPress and its plug-ins. But when you finished it's no longer a good idea to keep wp files owned by the web server.

It basically allows the web server to put or overwrite any file in your website. This means that there is a possibility to take over your site if someone manage to use the web server (or a security hole in some .php script) to put some files in your website.

To protect your site against such an attack you should to the following:

All files should be owned by your user account, and should be writable by you. Any file that needs write access from WordPress should be writable by the web server, if your hosting set up requires it, that may mean those files need to be group-owned by the user account used by the web server process.

/
The root WordPress directory: all files should be writable only by your user account, except .htaccess if you want WordPress to automatically generate rewrite rules for you.

/wp-admin/
The WordPress administration area: all files should be writable only by your user account.

/wp-includes/
The bulk of WordPress application logic: all files should be writable only by your user account.

/wp-content/
User-supplied content: intended to be writable by your user account and the web server process.

Within /wp-content/ you will find:

/wp-content/themes/
Theme files. If you want to use the built-in theme editor, all files need to be writable by the web server process. If you do not want to use the built-in theme editor, all files can be writable only by your user account.

/wp-content/plugins/
Plugin files: all files should be writable only by your user account.

Other directories that may be present with /wp-content/ should be documented by whichever plugin or theme requires them. Permissions may vary.

Source: https://stackoverflow.com/questions/18352682/correct-file-permissions-for-wordpress

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