securityonion/salt/firewall/iptables.jinja

{%- from 'vars/globals.map.jinja' import GLOBALS %}
{%- from 'docker/docker.map.jinja' import DOCKER %}
{%- from 'firewall/map.jinja' import FIREWALL_MERGED %}
{%- set role = GLOBALS.role.split('-')[1] %}
{%- from 'firewall/containers.map.jinja' import NODE_CONTAINERS %}

{%- set PR = [] %}
{%- set D1 = [] %}
{%- set D2 = [] %}
{%- for container in NODE_CONTAINERS %}
{%-   set IP = DOCKER.containers[container].ip %}
{%-   if DOCKER.containers[container].port_bindings is defined %}
{%-     for binding in DOCKER.containers[container].port_bindings %}
{#-       cant split int so we convert to string #}
{%-       set binding = binding|string %}
{#-          split the port binding by /. if proto not specified, default is tcp #}
{%-         set binding_split = binding.split('/') %}
{%-         if binding_split | length > 1 %}
{%-           set proto = binding_split[1] %}
{%-         else %}
{%-           set proto = 'tcp' %}
{%-         endif %}
{%-         set bsa = binding_split[0].split(':') %}
{%-         set bindip = '' %}
{%-         set hostPort = '' %}
{%-         set containerPort = '' %}
{%-         if bsa | length == 3 %}
{%-           set bindip = bsa[0] %}
{%-           set hostPort = bsa[1] %}
{%-           set containerPort = bsa[2] %}
{%-         endif %}
{%-         if bsa | length == 2 %}
{%-           set hostPort = bsa[0] %}
{%-           set containerPort = bsa[1] %}
{%-         endif %}
{%-         do PR.append("-A POSTROUTING -s " ~ DOCKER.containers[container].ip ~ "/32 -d " ~ DOCKER.containers[container].ip ~ "/32 -p " ~  proto ~ " -m " ~ proto  ~ " --dport " ~ containerPort ~ " -j MASQUERADE") %}
{%-         if bindip | length and bindip != '0.0.0.0' %}
{%-           do D1.append("-A DOCKER -d " ~ bindip ~ "/32 ! -i sobridge -p " ~ proto ~ " -m " ~ proto ~ " --dport " ~ hostPort ~ " -j DNAT --to-destination " ~ DOCKER.containers[container].ip ~ ":" ~ containerPort) %}
{%-         else %}
{%-           do D1.append("-A DOCKER ! -i sobridge -p " ~ proto ~ " -m " ~ proto ~ " --dport " ~ hostPort ~ " -j DNAT --to-destination " ~ DOCKER.containers[container].ip ~ ":" ~ containerPort) %}
{%-         endif %}
{%-         do D2.append("-A DOCKER -d " ~ DOCKER.containers[container].ip ~ "/32 ! -i sobridge -o sobridge -p " ~ proto ~ " -m " ~ proto ~ " --dport " ~ containerPort ~ " -j ACCEPT") %}
{%-     endfor %}
{%-   endif %}
{%- endfor %}

*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
:DOCKER - [0:0]
-A PREROUTING -m addrtype --dst-type LOCAL -j DOCKER
-A OUTPUT ! -d 127.0.0.0/8 -m addrtype --dst-type LOCAL -j DOCKER
-A POSTROUTING -s {{DOCKER.range}} ! -o sobridge -j MASQUERADE
{%- for rule in PR %}
{{ rule }}
{%- endfor %}
-A DOCKER -i sobridge -j RETURN
{%- for rule in D1 %}
{{ rule }}
{%- endfor %}

COMMIT
*filter
:INPUT ACCEPT [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]
:DOCKER - [0:0]
:DOCKER-ISOLATION-STAGE-1 - [0:0]
:DOCKER-ISOLATION-STAGE-2 - [0:0]
:DOCKER-USER - [0:0]
:LOGGING - [0:0]

{%- for chn, hostgroups in FIREWALL_MERGED.role[role].chain.items() %}
{%-   for hostgroup, portgroups in hostgroups['hostgroups'].items() %}
{%-     for ip in FIREWALL_MERGED.hostgroups[hostgroup] %}
{%-       for groupname in portgroups['portgroups'] %}
{%-         for proto, ports in FIREWALL_MERGED['portgroups'][groupname].items() %}
{%-           for port in ports %}
-A {{chn}} -s {{ip}} -p {{proto}} -m {{proto}} --dport {{port}} -j ACCEPT
{%-           endfor %}
{%-         endfor %}
{%-       endfor %}
{%-     endfor %}
{%-   endfor %}
{%- endfor %}

-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -p icmp -j ACCEPT
-A INPUT -j LOGGING
-A FORWARD -j DOCKER-USER
-A FORWARD -j DOCKER-ISOLATION-STAGE-1
-A FORWARD -o sobridge -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -o sobridge -j DOCKER
-A FORWARD -i sobridge ! -o sobridge -j ACCEPT
-A FORWARD -i sobridge -o sobridge -j ACCEPT
-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i lo -j ACCEPT
-A FORWARD -m conntrack --ctstate INVALID -j DROP
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
-A OUTPUT -o lo -j ACCEPT
# block icmp timestamp reply
-A OUTPUT -p icmp -m icmp --icmp-type 14 -j DROP

{%- for rule in D2 %}
{{ rule }}
{%- endfor %}

-A DOCKER-ISOLATION-STAGE-1 -i sobridge ! -o sobridge -j DOCKER-ISOLATION-STAGE-2
-A DOCKER-ISOLATION-STAGE-1 -j RETURN
-A DOCKER-ISOLATION-STAGE-2 -o sobridge -j DROP
-A DOCKER-ISOLATION-STAGE-2 -j RETURN
-A DOCKER-USER ! -i sobridge -o sobridge -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A DOCKER-USER ! -i sobridge -o sobridge -j LOGGING
-A DOCKER-USER -j RETURN
-A LOGGING -m limit --limit 2/min -j LOG --log-prefix "IPTables-dropped: "
-A LOGGING -j DROP
COMMIT