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nethserver-suricata

The IPS (Intrusion Prevention System) module configures Suricata using the netfilter queue (NFQUEUE). NFQUEUE is an iptables and ip6tables target which delegate the decision on packets to a userspace software.

All traffic will be analyzed by Suricata itself and events are logged inside /var/log/suricata/eve.json. See EveBox for a report of blocking and alerting rules.

Suricata rules are managed by Pulledpork.

Manually enable/disable Suricata

Enabling:

config setprop suricata status enabled
signal-event firewall-adjust
signal-event nethserver-suricata-save

Disabling:

config setprop suricata status disabled
signal-event firewall-adjust
signal-event nethserver-suricata-save

Bypass

All bypasses are saved inside the ips database.

Each record with bypass type has the following properties:

  • Host: it can be a firewall object or a raw IP/CIDR address
  • status: it can be enabled or disabled
  • Description: optional description

Example:

bypass1=bypass
  Description=
  Host=host;test1
  status=enabled
bypass2=bypass
  Description=
  Host=192.168.0.1
  status=disabled

Custom rules

If a file named /etc/suricata/rules/custom.rules, it will be included inside Suricata configuration. After creating the file, execute: signal-event nethserver-suricata-update.

Also remember to add it to the configuration backup:

echo /etc/suricata/rules/custom.rules >> /etc/backup-config.d/custom.include

Troubleshooting

When troubleshooting network traffic, just remember that Suricata will intercept all the traffic.