Hello all,

I have a problem with the Cookie authentication. I will try to explain my setup and the appearing problem as good as possible. It's a bit complicated due to the fact, that there is no error message in the interface and in the logs.

Setup

The system is an Ubuntu 16.04 LTS (Xenial) with PHP-FPM, Nginx and MySQL installed from the package repositories.

I use PHP-FPM pools, where every pool, has an own chroot.

Nginx connects to PHP-FPM with Unix-Sockets.

I am using phpMyAdmin version 4.6.5.2.

Problem

phpMyAdmin is installed and accessible on a subdomain. All traffic is exchanged via HTTPS.

Actually phpMyAdmin connects to MySQL via TCP connection. The problem is, that the Cookie authentication doesn't work. So if I set $cfg[auth_type] = "cookie"; I can't login to phpMyAdmin. The interface and the logs doesn't show any errors. When I change the mentioned variable to "http" so that HTTP Auth is used, the login works without problems.

Configuration

I use a few special PHP settings for security reasons. They are mostly the same as in the OWASP PHP Configuration Cheat Sheet. This document can be found here: https://www.owasp.org/index.php/PHP_Configuration_Cheat_Sheet

As I said no error is shown, and no error goes into the PHP log of the pool. I think all is related to the cookie or session handling, but I don't know how I could debug this.

Checked Things

I already checked the following:

1. The mcrypt extension is installed

2. Session data can be stored correctly

3. Disable the cookie and session related settings

Conclusion

I have checked some things but couldn't figure it out. So I would be happy about every type of help. If more information is needed please tell me what exactly is necessary.

P.S. Sorry for my bad english.