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fail2ban scans log files for malicious activity and executes actions based on what it finds.

Install the fail2ban package and enable the service.

Creates a jail.local config file based on pillar data to override configuration in the default jail.conf file and enables creation of all configuration files based on content blocks in pillar. See pillar-pt.example for reference and consult the fail2ban documentation.

First, fail2ban uses settings defined in /etc/fail2ban/jail.conf. jail.conf is provided by the package, and should not be changed.

Next, it uses /etc/fail2ban/jail.local to override settings from jail.conf. The fail2ban.config state populates the jail.local file using data from pillar. The jail.local file is only created if you use the fail2ban.config state.

The fail2ban.config state also populates the jail.local, fail2ban.local and the .conf files in action.d and filter.d via content blocks in pillar.

In the pillar.example, note that the iptable action uses port=ssh (lowercase), not port=SSH (uppercase).

The following states provide an alternate approach to managing fail2ban. Tested in Ubuntu 14/16 and CentOS 6/7.

Meta state for inclusion of all ng states.

Install the fail2ban package.

Configure fail2ban creating a jail.local file based on pillar data that overrid jail.conf. It also creates a file.local per action/filter. Either in jails, actions or filters is possible to setup a source_path options to upload your configuration directly (see pillar.example). It is also possible to remove either actions or filters setting up enabled: False in it section (see pillar.example).

Keep in mind that in ng states lookup, config, jails, actions and filters are at the same level (in the old states, all the sections are under lookup:

fail2ban:
  ng:
    lookup:
    config:
    jails:
    actions:
    filters:

Keep in mind also that in ng states change the syntax for the actions and filters adding a new config section and enabled option (optional):

fail2ban:
  ng:
    actions:
      name-of-action:
        enabled: True/False # OPTIONAL
        config:
          Definition:
              actionban:
              actionunban:
          Init:
              whatever:
    filters:
      name-of-filter:
        enabled: True/False # OPTIONAL
        config:
          Definition:
              failregex:

It is also possible to specify the source file for config, jails, actions and filters instead of using the template:

fail2ban:
  ng:
    config:
      source_path: salt://path-to-fail2ban-config-file
    jails:
      source_path: salt://path-to-fail2ban-config-file
    actions:
      name-of-action:
        config:
          source_path: salt://path-to-action-file
    filters:
      name-of-filter:
        config:
          source_path: salt://path-to-filter-file

Manage fail2ban service. It is also possible to disable the service using the following pillar configuration:

fail2ban:
  ng:
    enabled: False