block-a-brute
This is a command-line tool for blocking IP addresses conducting SSH bruteforce attempts. It uses auth.log to find SSH login attempts and gets IP geolocation information by scraping ipinfo.io and blocks IP addresses using good ol' iptables. Geoip information is typically all I need to look at to make a determination if an IP address should be blocked. If you'd like something more automated and mature, check out Fail2ban. This tool is useful if you'd like to make hard determinations on hosts to block, such as on a honeypot or a sensitive public server.
Whitelist
A whilelist file can be included to have block-a-brute ignore certain hosts.
IP's should be listed on separate lines like so:
# home
1.2.3.4
# work
5.6.7.8
Usage
$ ./block-a-brute.py --help
usage: block-a-brute.py [-h] [-w WHITELIST] [-l LOG] [-y]
block-a-brute - block SSH bruteforcers
optional arguments:
-h, --help show this help message and exit
-w WHITELIST, --whitelist WHITELIST
ip whitelist file
-l LOG, --log LOG log file
-y, --yes ban IP's without prompting
Here's how to throw down the banhammer:
$ sudo ./block-a-brute.py -w whitelist.txt -l log.txt
_ _ _ _ _
| |__ | | ___ ___| | __ __ _ | |__ _ __ _ _| |_ ___
| '_ \| |/ _ \ / __| |/ /____ / _` |_____| '_ \| '__| | | | __/ _ \
| |_) | | (_) | (__| <_____| (_| |_____| |_) | | | |_| | || __/
|_.__/|_|\___/ \___|_|\_\ \__,_| |_.__/|_| \__,_|\__\___|
https://github.com/vesche/block-a-brute
Loading IP's from auth.log...
IP: <removed>
City: St Petersburg
Region: St.-Petersburg
Country: RU
Org: AS57043 HOSTKEY B.V.
Would you like to ban <removed> (y/N)? y
Got em' coach! <removed> was blocked.
IP: <removed>
City: Hebei
Region: Hebei
Country: CN
Org: AS4837 CHINA UNICOM China169 Backbone
Would you like to ban <removed> (y/N)? y
Got em' coach! <removed> was blocked
If you're confident in your whitelist file, use the -y option to ban without prompting.