Firewall-as-a-Service (FWaaS) v2 scenario

Note

Firewall v2 has no support for OVN currently.

Installation of FWaaS v2

If possible, you should rely on packages provided by your Linux and/or OpenStack distribution:

  • For example for Ubuntu you can install the neutron-fwaas-common package provided by Canonical.

Warning

Always check the version of the available package and check the releases on https://releases.openstack.org/

If you use pip, follow these steps to install neutron-fwaas:

  • identify the version of the neutron-fwaas package that matches your OpenStack version:

    • 2023.1 Antelope: latest 18.0.x version

    • Zed: latest 17.0.x version

  • indicate pip to (a) install precisely this version and (b) take into account OpenStack upper constraints on package versions for dependencies (example for Antelope):

    pip install -c https://opendev.org/openstack/requirements/raw/branch/stable/2023.1/upper-constraints.txt neutron-fwaas==18.0.0

Enable FWaaS v2

  1. Enable the FWaaS plug-in in the /etc/neutron/neutron.conf file:

    service_plugins = firewall_v2

[service_providers]
# ...
service_provider = FIREWALL_V2:fwaas_db:neutron_fwaas.services.firewall.service_drivers.agents.agents.FirewallAgentDriver:default

[fwaas]
agent_version = v2
driver = neutron_fwaas.services.firewall.service_drivers.agents.drivers.linux.iptables_fwaas_v2.IptablesFwaasDriver
enabled = True

    Note

    On Ubuntu and Centos, modify the [fwaas] section in the /etc/neutron/fwaas_driver.ini file instead of /etc/neutron/neutron.conf.

  2. Configure the FWaaS plugin for the L3 agent.

    In the AGENT section of l3_agent.ini, make sure the FWaaS v2 extension is loaded:

    [AGENT]
extensions = fwaas_v2

  3. Configure the ML2 plugin agent extension.

    Add the following statements to ml2_conf.ini, this file is usually located at /etc/neutron/plugins/ml2/ml2_conf.ini:

    [agent]
extensions = fwaas_v2

[fwaas]
firewall_l2_driver = noop

  4. Create the required tables in the database:

    # neutron-db-manage --subproject neutron-fwaas upgrade head

  5. Restart the neutron-l3-agent, neutron-openvswitch-agent and neutron-server services to apply the settings.

Configure Firewall-as-a-Service v2

Create the firewall rules and create a policy that contains them. Then, create a firewall that applies the policy.

  1. Create a firewall rule:

    $ openstack firewall group rule create --protocol {tcp,udp,icmp,any} \
  --source-ip-address SOURCE_IP_ADDRESS \
  --destination-ip-address DESTINATION_IP_ADDRESS \
  --source-port SOURCE_PORT_RANGE --destination-port DEST_PORT_RANGE \
  --action {allow,deny,reject}

    The Networking client requires a protocol value. If the rule is protocol agnostic, you can use the any value.

    Note

    When the source or destination IP address are not of the same IP version (for example, IPv6), the command returns an error.

  2. Create a firewall policy:

    $ openstack firewall group policy create --firewall-rule \
  "FIREWALL_RULE_IDS_OR_NAMES" myfirewallpolicy

    Separate firewall rule IDs or names with spaces. The order in which you specify the rules is important.

    You can create a firewall policy without any rules and add rules later, as follows:

    • To add multiple rules, use the update operation.

    • To add a single rule, use the insert-rule operation.

    For more details, see Networking command-line client in the OpenStack Command-Line Interface Reference.

    Note

    FWaaS always adds a default deny all rule at the lowest precedence of each policy. Consequently, a firewall policy with no rules blocks all traffic by default.

  3. Create a firewall group:

    $ openstack firewall group create --ingress-firewall-policy \
  "FIREWALL_POLICY_IDS_OR_NAMES" --egress-firewall-policy \
  "FIREWALL_POLICY_IDS_OR_NAMES" --port "PORT_IDS_OR_NAMES"

    Separate firewall policy IDs or names with spaces. The direction in which you specify the policies is important.

    Note

    The firewall remains in PENDING_CREATE state until you create a Networking router and attach an interface to it.