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cookbook for fail2ban - fail2ban.markdown (#2710)
* Create fail2ban.markdown * Tweak format a little bit
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bbrendon
Fabian Affolter
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source/_cookbook/fail2ban.markdown
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source/_cookbook/fail2ban.markdown
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---
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layout: page
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title: "fail2ban for HASS"
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description: "Setting up fail2ban to read HASS log files to improve security."
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date: 2017-05-24 10:05
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sidebar: true
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comments: false
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sharing: true
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footer: true
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ha_category: Infrastructure
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---
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This is a quick guide on how to setup fail2ban for Home Assistant. This was originally in the [forum](https://community.home-assistant.io/t/is-there-a-log-file-for-invalid-logins-blocking-hackers/2892) but I created this here for people.
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First install `fail2ban`. On Debian/Ubuntu this would be `apt-get install fail2ban`. On other distros you can google it.
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Next we will be creating these three files :
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- `/etc/fail2ban/fail2ban.local`
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- `/etc/fail2ban/filter.d/hass.local`
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- `/etc/fail2ban/jail.local`
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Contents of `/etc/fail2ban/fail2ban.local`:
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```text
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[Definition]
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logtarget = SYSLOG
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```
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Contents of `/etc/fail2ban/filter.d/hass.local`:
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```text
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[INCLUDES]
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before = common.conf
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[Definition]
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failregex = ^%(__prefix_line)s.*Login attempt or request with an invalid password from <HOST>.*$
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ignoreregex =
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[Init]
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datepattern = ^%%y-%%m-%%d %%H:%%M:%%S
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```
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Contents of `/etc/fail2ban/jail.local` (Note that you'll need to change the `logpath` to match your logfile which will be different from the path listed.):
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```text
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[hass-iptables]
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enabled = true
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filter = hass
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action = iptables-allports[name=HASS]
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logpath = /opt/hass-prod-cfg/home-assistant.log
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maxretry = 5
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```
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Finally restart fail2ban : `sudo systemctl restart fail2ban`
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Check your log to make sure it read in your settings : `tail -100 /var/log/syslog|grep fail`
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If all is well you should see this from your syslog:
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```bash
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May 24 20:58:01 homeauto fail2ban.server[14997]: INFO Stopping all jails
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May 24 20:58:02 homeauto fail2ban.jail[14997]: INFO Jail 'sshd' stopped
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May 24 20:58:02 homeauto fail2ban-client[15206]: Shutdown successful
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May 24 20:58:02 homeauto fail2ban.server[14997]: INFO Exiting Fail2ban
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May 24 20:58:02 homeauto fail2ban-client[15213]: 2017-05-24 20:58:02,342 fail2ban.server [15215]: INFO Starting Fail2ban v0.9.6
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May 24 20:58:02 homeauto fail2ban-client[15213]: 2017-05-24 20:58:02,343 fail2ban.server [15215]: INFO Starting in daemon mode
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May 24 20:58:02 homeauto fail2ban.server[15217]: INFO Changed logging target to SYSLOG (/dev/log) for Fail2ban v0.9.6
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May 24 20:58:02 homeauto fail2ban.database[15217]: INFO Connected to fail2ban persistent database '/var/lib/fail2ban/fail2ban.sqlite3'
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May 24 20:58:02 homeauto fail2ban.jail[15217]: INFO Creating new jail 'sshd'
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May 24 20:58:02 homeauto fail2ban.jail[15217]: INFO Jail 'sshd' uses pyinotify {}
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May 24 20:58:02 homeauto fail2ban.jail[15217]: INFO Initiated 'pyinotify' backend
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May 24 20:58:02 homeauto fail2ban.actions[15217]: INFO Set banTime = 600
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May 24 20:58:02 homeauto fail2ban.filter[15217]: INFO Set findtime = 600
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May 24 20:58:02 homeauto fail2ban.filter[15217]: INFO Set maxRetry = 5
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May 24 20:58:02 homeauto fail2ban.filter[15217]: INFO Added logfile = /var/log/auth.log
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May 24 20:58:02 homeauto fail2ban.filter[15217]: INFO Set jail log file encoding to UTF-8
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May 24 20:58:02 homeauto fail2ban.filter[15217]: INFO Set maxlines = 10
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May 24 20:58:02 homeauto fail2ban.server[15217]: INFO Jail sshd is not a JournalFilter instance
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May 24 20:58:02 homeauto fail2ban.jail[15217]: INFO Creating new jail 'hass-iptables'
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May 24 20:58:02 homeauto fail2ban.jail[15217]: INFO Jail 'hass-iptables' uses pyinotify {}
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May 24 20:58:02 homeauto fail2ban.jail[15217]: INFO Initiated 'pyinotify' backend
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May 24 20:58:02 homeauto fail2ban.actions[15217]: INFO Set banTime = 600
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May 24 20:58:02 homeauto fail2ban.filter[15217]: INFO Set findtime = 600
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May 24 20:58:02 homeauto fail2ban.filter[15217]: INFO Set maxRetry = 5
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May 24 20:58:02 homeauto fail2ban.filter[15217]: INFO Added logfile = /opt/hass-prod-cfg/home-assistant.log
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May 24 20:58:02 homeauto fail2ban.filter[15217]: INFO Set jail log file encoding to UTF-8
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May 24 20:58:02 homeauto fail2ban.filter[15217]: INFO Date pattern set to `'^%y-%m-%d %H:%M:%S'`: `^Year2-Month-Day 24hour:Minute:Second`
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May 24 20:58:02 homeauto fail2ban.jail[15217]: INFO Jail 'sshd' started
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May 24 20:58:02 homeauto fail2ban.jail[15217]: INFO Jail 'hass-iptables' started
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```
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That's it!
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If you want to read more about fail2ban, some links are below:
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http://www.fail2ban.org/wiki/index.php/FEATURE_Split_config
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https://www.digitalocean.com/community/tutorials/how-to-protect-ssh-with-fail2ban-on-ubuntu-14-04
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