Ship Fail2ban logs

Fail2Ban is an intrusion prevention software framework that protects computer servers from brute-force attacks. This integration allows you to send Fail2ban logs to your Logz.io SIEM account.

Guided configuration

Before you begin, you’ll need: Filebeat Fail2ban, root access

Download the Logz.io public certificate to your credentials server

For HTTPS shipping, download the Logz.io public certificate to your certificate authority folder.

sudo curl https://raw.githubusercontent.com/logzio/public-certificates/master/AAACertificateServices.crt --create-dirs -o /etc/pki/tls/certs/COMODORSADomainValidationSecureServerCA.crt

Add Fail2ban as an input

In the Filebeat configuration file (/etc/filebeat/filebeat.yml), add Fail2ban to the filebeat.inputs section.

Replace <<LOG-SHIPPING-TOKEN>> with the token of the account you want to ship to.

Filebeat requires a file extension specified for the log input.

# ...
filebeat.inputs:
- type: filestream

  paths:
  - /var/log/fail2ban.log

  fields:
    logzio_codec: plain

    # Your Logz.io account token. You can find your token at
    #  https://app.logz.io/#/dashboard/settings/manage-accounts
    token: <<LOG-SHIPPING-TOKEN>>
    type: fail2ban
  fields_under_root: true
  encoding: utf-8
  ignore_older: 3h

If you’re running Filebeat 7 to 8.1, paste the code block below instead:

# ...
filebeat.inputs:
- type: log

  paths:
  - /var/log/fail2ban.log

  fields:
    logzio_codec: plain

    # Your Logz.io account token. You can find your token at
    #  https://app.logz.io/#/dashboard/settings/manage-accounts
    token: <<LOG-SHIPPING-TOKEN>>
    type: fail2ban
  fields_under_root: true
  encoding: utf-8
  ignore_older: 3h

Set Logz.io as the output

If Logz.io is not an output, add it now. Remove all other outputs.

Replace <<LISTENER-HOST>> with the host for your region. For example, listener.logz.io if your account is hosted on AWS US East, or listener-nl.logz.io if hosted on Azure West Europe. The required port depends whether HTTP or HTTPS is used: HTTP = 8070, HTTPS = 8071.

# ...
output.logstash:
  hosts: ["<<LISTENER-HOST>>:5015"]
  ssl:
    certificate_authorities: ['/etc/pki/tls/certs/COMODORSADomainValidationSecureServerCA.crt']

Start Filebeat

Start or restart Filebeat for the changes to take effect.

Check Logz.io for your logs

Give your logs some time to get from your system to ours, and then open Open Search Dashboards.

If you still don’t see your logs, see Filebeat troubleshooting.