securityonion/salt/firewall/init.sls

# Firewall Magic

# Keep localhost in the game
iptables_allow_localhost:
  iptables.append:
    - table: filter
    - chain: INPUT
    - jump: ACCEPT
    - source: 127.0.0.1
    - save: True

# Allow related/established sessions
iptables_allow_established:
  iptables.append:
    - table: filter
    - chain: INPUT
    - jump: ACCEPT
    - match: conntrack
    - ctstate: 'RELATED,ESTABLISHED'
    - save: True

# Always allow SSH so we can like log in
iptables_allow_ssh:
  iptables.append:
    - table: filter
    - chain: INPUT
    - jump: ACCEPT
    - dport: 22
    - proto: tcp
    - save: True

# I like pings
iptables_allow_pings:
  iptables.append:
    - table: filter
    - chain: INPUT
    - jump: ACCEPT
    - proto: icmp
    - save: True

# Create the chain for logging
iptables_LOGGING_chain:
  iptables.chain_present:
    - name: LOGGING
    - table: filter
    - family: ipv4

iptables_LOGGING_limit:
  iptables.append:
    - table: filter
    - chain: LOGGING
    - match: limit
    - jump: LOG
    - limit: 2/min
    - log-level: 4
    - log-prefix: "IPTables-dropped: "

# Make the input policy send stuff that doesn't match to be logged and dropped
iptables_log_input_drops:
  iptables.append:
    - table: filter
    - chain: INPUT
    - jump: LOGGING
    - save: True

# Set the policy to deny everything unless defined
#enable_reject_policy:
#  iptables.set_policy:
#    - table: filter
#    - chain: INPUT
#    - policy: DROP
#    - require:
#      - iptables: iptables_allow_localhost
#      - iptables: iptables_allow_established
#      - iptables: iptables_allow_ssh
#      - iptables: iptables_allow_pings

# Enable global DOCKER-USER block rule
enable_docker_user_fw_policy:
  iptables.insert:
    - table: filter
    - chain: DOCKER-USER
    - jump: LOGGING
    - in-interface: '!docker0'
    - out-interface: docker0
    - position: 1
    - save: True

enable_docker_user_established:
  iptables.insert:
    - table: filter
    - chain: DOCKER-USER
    - jump: ACCEPT
    - in-interface: '!docker0'
    - out-interface: docker0
    - position: 1
    - save: True
    - match: conntrack
    - ctstate: 'RELATED,ESTABLISHED'

# Rules if you are a Master
{% if grains['role'] == 'so-master' %}

# Make it so all the minions can talk to salt and update etc.
{% for ip in pillar.get('minions')  %}

enable_salt_minions_4505_{{ip}}:
  iptables.insert:
    - table: filter
    - chain: INPUT
    - jump: ACCEPT
    - proto: tcp
    - source: {{ ip }}
    - dport: 4505
    - position: 1
    - save: True

enable_salt_minions_4506_{{ip}}:
  iptables.insert:
    - table: filter
    - chain: INPUT
    - jump: ACCEPT
    - proto: tcp
    - source: {{ ip }}
    - dport: 4506
    - position: 1
    - save: True

enable_salt_minions_5000_{{ip}}:
  iptables.insert:
    - table: filter
    - chain: DOCKER-USER
    - jump: ACCEPT
    - proto: tcp
    - source: {{ ip }}
    - dport: 5000
    - position: 1
    - save: True

enable_salt_minions_3142_{{ip}}:
  iptables.insert:
    - table: filter
    - chain: DOCKER-USER
    - jump: ACCEPT
    - proto: tcp
    - source: {{ ip }}
    - dport: 3142
    - position: 1
    - save: True

{% endfor %}

# Allow Forward Nodes to send their beats traffic
{% for ip in pillar.get('forward_nodes')  %}

enable_forwardnode_beats_5044_{{ip}}:
  iptables.insert:
    - table: filter
    - chain: DOCKER-USER
    - jump: ACCEPT
    - proto: tcp
    - source: {{ ip }}
    - dport: 5044
    - position: 1
    - save: True

{% endfor %}

# Allow Beats Endpoints to send their beats traffic
{% for ip in pillar.get('beats_endpoint')  %}

enable_standard_beats_5044_{{ip}}:
  iptables.insert:
    - table: filter
    - chain: DOCKER-USER
    - jump: ACCEPT
    - proto: tcp
    - source: {{ ip }}
    - dport: 5044
    - position: 1
    - save: True

{% endfor %}

# Rules for storage nodes connecting to master


{% endif %}

# Rules if you are a Storage Node

# Rules if you are a Sensor
{% if grains['role'] == 'so-sensor' %}

{% endif %}

# Rules if you are a Hot Node

# Rules if you are a Warm Node

# Some Fixer upper type rules
# Drop it like it's hot
# Make the input policy send stuff that doesn't match to be logged and dropped
iptables_drop_all_the_things:
  iptables.append:
    - table: filter
    - chain: LOGGING
    - jump: DROP
    - save: True