Analyzing PFsense squid logs in Graylog

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We will parse the access log records generated by PfSense and squid plugin. We already have our graylog server running and we will start preparing the terrain to capture those logs records.

Many thanks to opc40772 developed the original contantpack for pfsense squid log agregation what I updated for the new Graylog3 and Elasticsearch 6.

Celebro localinstall

# celebro van to use port 9000 so change graylog3 bindport
nano /etc/graylog/server/server.conf
http_bind_address =
nano /etc/nginx/conf.d/graylog.conf

systemctl restart graylog-server.service
systemctl restart nginx

yum localinstall cerebro-0.8.3-1.noarch.rpm

Create indices

We now create the Pfsense indice on Graylog at System / Indexes image

Import index template for elasticsearch 6.x

systemctl stop graylog-server.service

Go to celebro > more > index templates Create new with name: pfsense-custom and copy the template from file squid_custom_template_el6.json Edit other pfsense template to (sorrend 0)

In Cerebro we stand on top of the pfsense index and unfold the options and select delete index.

Geoip database

wget -t0 -c
tar -xvf GeoLite2-City.tar.gz
cp GeoLite2-City_*/GeoLite2-City.mmdb /etc/graylog/server

systemctl start graylog-server.service

Enable geoip database at System \ Imput > Configurations > Plugins > Geo-Location Processor > update Chane the order of the Message Processors Configuration

  • AWS Instance Name Lookup
  • Message Filter Chain
  • Pipeline Processor
  • GeoIP Resolver

Enable geoip database

Import contantpack

git clone

import chaneg date timezone in Pipeline rule Go tu Stream menu and edit stream image

System > Pipelines Manage rules and then Edit rule (Change the timezone)

rule "timestamp_pfsense_for_grafana"
// the following date format assumes there's no time zone in the string
 let source_timestamp = parse_date(substring(to_string(now("Europe/Budapest")),0,23), "yyyy-MM-dd'T'HH:mm:ss.SSS");
 let dest_timestamp = format_date(source_timestamp,"yyyy-MM-dd HH:mm:ss");
 set_field("real_timestamp", dest_timestamp);

Add the existing pipeline to the squid stream by clicking the Edit connections at Pipeline connections.


Confifure pfsense

pkg add

nano /usr/local/etc/filebeat.yml
- input_type: log
  document_type: squid3
    - /var/squid/logs/access.log

  # The Logstash hosts
  hosts: [""]

  # Optional SSL. By default is off.
  # List of root certificates for HTTPS server verifications
  bulk_max_size: 2048
 #ssl.certificate_authorities: ["/etc/filebeat/logstash.crt"] "filebeat"
  template.path: "filebeat.template.json"
  template.overwrite: false
  # Certificate for SSL client authentication
  #ssl.certificate: "/etc/pki/client/cert.pem"

  # Client Certificate Key
  #ssl.key: "/etc/pki/client/cert.key"

/usr/local/sbin/filebeat -c /usr/local/etc/filebeat.yml test config
cp /usr/local/etc/rc.d/filebeat /usr/local/etc/rc.d/
echo "filebeat_enable=yes" >> /etc/rc.conf.local
echo "filebeat_conf=/usr/local/etc/filebeat.yml" >> /etc/rc.conf.local

/usr/local/etc/rc.d/ start
ps aux | grep beat

Install grafana Dashboard

# install nececery plugins
grafana-cli plugins install grafana-piechart-panel
grafana-cli plugins install grafana-worldmap-panel
grafana-cli plugins install savantly-heatmap-panel
grafana-cli plugins install briangann-datatable-panel
systemctl restart grafana-server

Create new datasource: image

Import dashboadr.