coredns's Introduction

Gravwell CoreDNS plugin

The Gravwell CoreDNS plugin allows for directly integrating DNS auditing into Gravwell. The plugin acts as an integrated ingester and ships DNS requests and responses directly to a Gravwell instance.

DNS Requests and responses can be encoded as text, JSON, or as a packed binary format.

CoreDNS Kit in Gravwell

Gravwell provides a CoreDNS Kit to work with data ingested by CoreDNS out of the box and provides a number of prebuilt queries, dashboards, and investigation tools.

Building CoreDNS with the Gravwell plugin

git clone https://github.com/coredns/coredns.git
pushd coredns
sed -i 's/metadata:metadata/metadata:metadata\ngravwell:github.com\/gravwell\/coredns/g' plugin.cfg
go generate
go get github.com/gravwell/coredns
CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /tmp/coredns
popd

The statically CoreDNS server with the Gravwell plugin will be located at /tmp/coredns

Getting started with gravwell

Install Gravwell community edition https://dev.gravwell.io/docs/#!quickstart/community-edition.md

Grab a free Gravwell license https://www.gravwell.io/activate-community-edition

Configure your Corefile with an indexer target and your Ingest-Secret

Example Corefile

.:53 {
  forward . 8.8.8.8:53 8.8.4.4:53 9.9.9.9:53
  errors stdout
  bind 10.0.0.1
  cache 240
  whoami
  gravwell {
   Ingest-Secret IngestSecretToken
   Cleartext-Target 192.168.1.1:4023
   Tag dns
   Encoding json
   Log-Level INFO
   #Cleartext-Target 192.168.1.2:4023 #second indexer
   #Ciphertext-Target 192.168.1.1:4024
   #Insecure-Novalidate-TLS true #disable TLS certificate validation
   #Ingest-Cache-Path /tmp/coredns_ingest.cache #enable the local ingest cache
   #Max-Cache-Size-MB 1024
  }
}

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