Magento 2 module that logs admin authentication attempts

Values that get logged include:

username
status (whether or not the login attempt succeeded)
timestamp (Unix timestamp of the login attempt)
time (time of login attempt in Y-m-d H:i:s format)
remote_ip (value of $_SERVER['REMOTE_ADDR'])
real_ip (if the user is behing a proxy, this value is a best attempt at ascertaining that user's true IP. This value shouldn't be relied on, but it might still be nice to have, so I included it)
user_agent
url (value of $_SERVER['REQUEST_URI'])
referrer (value of $_SERVER['HTTP_REFERER'])

Authentication attempts get logged to /path/to/store/var/log/crankycyclops/adminauthlog/auth.log.

Installing and Enabling AdminAuthLog

mkdir -p /path/to/store/thirdparty/Crankycyclops
cd /path/to/store/thirdparty/Crankycyclops
git clone git@github.com:crankycyclops/AdminAuthLog.git
ln -s /path/to/store/app/code/Crankycyclops /path/to/store/thirdparty/Crankycyclops
php bin/magento module:enable Crankycyclops_AdminAuthLog
php bin/magento setup:upgrade

Make sure to clear your cache, and also to run di:compile if you're in production mode.

TODO: composer package coming soon!

Configuring Fail2ban

1. Setup filter

ln -s /path/to/store/thirdparty/Crankycyclops/AdminAuthLog/fail2ban/filter.d/magento-adminauthlog.conf /etc/fail2ban/filter.d/magento-adminauthlog.conf

2. Add filter to jail.local

Edit /etc/fail2ban/jail.local and append the following:

[magento-adminauthlog]

enabled = true
filter = magento-adminauthlog
logpath = /path/to/store/var/log/crankycyclops/adminauthlog/auth.log