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Graylog4 supported

Content Pack for PiHole 5 with Graylog

Built and based off of https://github.com/chateaulav/pihole & https://github.com/agreenbhm/pihole_graylog_content_pack which both rely heavily on https://jalogisch.de/2017/der-eigene-dns-resolver-zuhause/ Includes setting GeoIP, so ensure you download the current City db from Maxmind, and install the current Threat intelligence content packs. A seperate input is established to collect only pihole syslog traffic.

Syslog requirements

syslog-ng Best option, simple and only sends pihole data

#apt install syslog-ng -y
#vi /etc/syslog-ng/conf.d/10-pihole.conf
source s_pihole_log { file("/var/log/pihole.log"); };
destination d_graylog {udp("server.ip" port(1515)); };
log { source(s_pihole_log); destination(d_graylog); };

Graylog prerequisites:

Change the Message Processor Configuration within (System -> Configuration -> Message Processor Configuration):

Dashboard Demo:

Content Pack includes:

  • Input:
    Sets a seperate input for just pihole DNS Logs

    • piHole Syslog (Listen 0.0.0.0:1515/UDP)

  • Extractor:

    • app_name (sets to dnsmasq for matching messages)

  • Stream:

    • PiHole Messages (adds messages with app_name = dnsmasq to separate stream and removes from All Messages)

  • Pipeline:
    Creates Multiple fields to enable stronger queries and analytics

    • -2 Rules:
      • drop pihole unnecessary messages
    • -1 Rules:
      • dnsmasq pihole split
    • 0 Rules:
      • PiHole GeoIP Set
    • 1 Rules:
      • threatintel (dnsmasq)
    • 2 Rules:
      • threatintel (2) inflate

  • Lookup Table\Cache:

    • geolite2-city (/usr/share/graylog/data/GeoLite2-City.mmdb)

  • Dashboard called DNS Intel:

    • DNS Activities Over Time (24h)
    • DNS Location Requested IP (from answers) (24h)
    • Threat Indicated Count (24h)
    • DNS Query Count (24)
    • DNS Query Logs (24h)
    • Threat Names (24h)
    • DNS Clients (24h)