Access denied (403) for PHP files with Nginx + PHP-FPM

Question

I have been spending few hours on that issue and despite the high number of posts related to it, I cannot solve it. I have a Fedora 20 box with Nginx + PHP-FPM that worked quite good until today (after I reloaded php-fpm.service I guess). Nginx is serving static files with no problem, but any PHP file triggers an error 403.

The permissions are ok, nginx and php-fpm are running under the user "nginx":

root     13763  0.0  0.6 490428 24924 ?        Ss   15:47   0:00 php-fpm: master process (/etc/php-fpm.conf)
nginx    13764  0.0  0.1 490428  7296 ?        S    15:47   0:00 php-fpm: pool www
nginx    13765  0.0  0.1 490428  7296 ?        S    15:47   0:00 php-fpm: pool www
nginx    13766  0.0  0.1 490428  7296 ?        S    15:47   0:00 php-fpm: pool www
nginx    13767  0.0  0.1 490428  7296 ?        S    15:47   0:00 php-fpm: pool www
nginx    13768  0.0  0.1 490428  6848 ?        S    15:47   0:00 php-fpm: pool www

The served files have been set to nginx user as well, I even ended chmoding 777 those files to try, but still "Access denied" for any PHP files.

Below is a server of my Nginx config:

server {
        listen          80;
        server_name     localhost;

        root            /var/www/html;

         location ~ \.php$ {
            fastcgi_intercept_errors on;
            try_files $uri =404;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            include        fastcgi_params;
        }
}

The PHP-FPM pool:

[www]
...
listen = 127.0.0.1:9000
user = nginx
group = nginx
...

For the versions:

php-5.5.11 (as well as php-fpm-5.5.11 of course)

nginx-1.4.7

I am adding the Nginx error log:

 FastCGI sent in stderr: "Access to the script '/var/www/html' has been denied (see security.limit_extensions)" while reading response header from upstream, client: xxx.xxx.xxx.xxx, server: localhost, request: "GET /index.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "xxx.xxx.xxx.xxx"

And precise that security.limit_extensions is correct, set to: security.limit_extensions = .php.

About the path permissions, /var/www/html can be traversed. What am I missing?

Answer 1

Here are some possible solutions:

1. In your php-fpm www.conf set security.limit_extensions to .php or .php5 or whatever suits your environment. For some users, completely removing all values or setting it to FALSE was the only way to get it working.

2. In your nginx config file set fastcgi_pass to your socket address (e.g. unix:/var/run/php-fpm/php-fpm.sock;) instead of your server address and port.

3. Check your SCRIPT_FILENAME fastcgi param and set it according to the location of your files.

4. In your nginx config file include fastcgi_split_path_info ^(.+\.php)(/.+)$; in the location block where all the other fastcgi params are defined.

5. In your php.ini set cgi.fix_pathinfo to 1

Answer 2

Please note that the above solution (set cgi.fix_pathinfo to 1) is a terrible idea. See https://nealpoole.com/blog/2011/04/setting-up-php-fastcgi-and-nginx-dont-trust-the-tutorials-check-your-configuration/ for a good overview.

The issue is probably down to your application relying on PATH_INFO. Enable access logging for php to get more information about how your application is called to help you debug this issue.

Once again, just to be sure - the accepted solution is a terrible idea, and will likely get your site hacked.

Answer 3

Do not forget to restart php5-fpm service after changing php.ini!!

service php5-fpm restart or service php5-fpm reload

fpm prestarts php5 so it is not enough to restart nginx to have the changes applied.

Answer 4

It may be related to selinux. If you use the shared folder of Virtual Box, you cannot change the access permissions in this folder in Linux. Therefore, you can solve it after closing selinux.