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auth: Fix password_changed function, fixes #4043....
auth: Fix password_changed function, fixes #4043. Never repot a changed password for default or anonymous users. If anonymous access is disabled we don't get the default user here so we also have to check if it is the anonymous user. In both cases (default user and anonymous user) we can skip the password change check and return False.

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nginx-diffie-hellman.rst
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Diffie-Hellman Security
-----------------------
To secure your web server, the `Guide to Deploying Diffie-Hellman for TLS`_
contains important information worth reading. This link contains a good
`nginx secure configuration`_ example. The documentation below also contains
good security settings with some additional |RCE| specific examples.
To secure your deployment of Diffie-Hellman, configure the following:
* Generate a strong Diffie-hellman group, 2048-bit or stronger.
.. code-block:: bash
# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048
* Configure your server to only use modern, secure cipher suites in the
virtual hosts configuration file.
.. code-block:: nginx
# Set the TLS protocols and to only use modern, secure cipher suites.
ssl_ciphers "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4";
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
# Diffie-Hellman parameter for DHE ciphersuites, recommended 2048 bits
ssl_dhparam /etc/nginx/ssl/dhparam.pem;
.. _Guide to Deploying Diffie-Hellman for TLS: https://weakdh.org/sysadmin.html
.. _nginx secure configuration: https://gist.github.com/plentz/6737338