firewall

Table of Contents

1. Overview - What is the Firewall module?
2. Module Description - What does the module do?
3. Setup - The basics of getting started with Firewall
   • What Firewall affects
   • Setup Requirements
   • Beginning with Firewall
   • Upgrading
4. Usage - Configuration and customization options
   • Default rules - Setting up general configurations for all firewalls
   • Application-specific rules - Options for configuring and managing firewalls across applications
   • Other Rules
5. Reference - An under-the-hood peek at what the module is doing
6. Limitations - OS compatibility, etc.
7. Development - Guide for contributing to the module
   • Tests - Testing your configuration

Overview

The Firewall module lets you manage firewall rules with Puppet.

Module Description

PuppetLabs’ Firewall introduces the resource firewall, which is used to manage and configure firewall rules from within the Puppet DSL. This module offers support for iptables, ip6tables, and ebtables.

The module also introduces the resource firewallchain, which allows you to manage chains or firewall lists. At the moment, only iptables and ip6tables chains are supported.

Setup

What Firewall affects:

• every node running a firewall
• system’s firewall settings
• connection settings for managed nodes
• unmanaged resources (get purged)
• site.pp

Setup Requirements

Firewall uses Ruby-based providers, so you must have pluginsync enabled.

Beginning with Firewall

To begin, you need to provide some initial top-scope configuration to ensure your firewall configurations are ordered properly and you do not lock yourself out of your box or lose any configuration.

Persistence of rules between reboots is handled automatically, although there are known issues with ip6tables on older Debian/Ubuntu, as well as known issues with ebtables.

In your site.pp (or some similarly top-scope file), set up a metatype to purge unmanaged firewall resources. This will clear any existing rules and make sure that only rules defined in Puppet exist on the machine.

resources { "firewall":
  purge => true
}

Next, set up the default parameters for all of the firewall rules you will be establishing later. These defaults will ensure that the pre and post classes (you will be setting up in just a moment) are run in the correct order to avoid locking you out of your box during the first puppet run.

Firewall {
  before  => Class['my_fw::post'],
  require => Class['my_fw::pre'],
}

You also need to declare the my_fw::pre & my_fw::post classes so that dependencies are satisfied. This can be achieved using an External Node Classifier or the following

class { ['my_fw::pre', 'my_fw::post']: }

Finally, you should include the firewall class to ensure the correct packages are installed.

class { 'firewall': }

Now to create the my_fw::pre and my_fw::post classes. Firewall acts on your running firewall, making immediate changes as the catalog executes. Defining default pre and post rules allows you provide global defaults for your hosts before and after any custom rules; it is also required to avoid locking yourself out of your own boxes when Puppet runs. This approach employs a whitelist setup, so you can define what rules you want and everything else is ignored rather than removed.

The pre class should be located in my_fw/manifests/pre.pp and should contain any default rules to be applied first.

class my_fw::pre {
  Firewall {
    require => undef,
  }

  # Default firewall rules
  firewall { '000 accept all icmp':
    proto   => 'icmp',
    action  => 'accept',
  }->
  firewall { '001 accept all to lo interface':
    proto   => 'all',
    iniface => 'lo',
    action  => 'accept',
  }->
  firewall { '002 accept related established rules':
    proto   => 'all',
    state   => ['RELATED', 'ESTABLISHED'],
    action  => 'accept',
  }
}

The rules in pre should allow basic networking (such as ICMP and TCP), as well as ensure that existing connections are not closed.

The post class should be located in my_fw/manifests/post.pp and include any default rules to be applied last.

class my_fw::post {
  firewall { '999 drop all':
    proto   => 'all',
    action  => 'drop',
    before  => undef,
  }
}

To put it all together: the before parameter in Firewall {} ensures my_fw::post is run before any other rules and the the require parameter ensures my_fw::pre is run after any other rules. So the run order is:

• run the rules in my_fw::pre
• run your rules (defined in code)
• run the rules in my_fw::post

Upgrading

Upgrading from version 0.2.0 and newer

Upgrade the module with the puppet module tool as normal:

puppet module upgrade puppetlabs/firewall

Upgrading from version 0.1.1 and older

Start by upgrading the module using the puppet module tool:

puppet module upgrade puppetlabs/firewall

Previously, you would have required the following in your site.pp (or some other global location):

# Always persist firewall rules
exec { 'persist-firewall':
  command     => $operatingsystem ? {
    'debian'          => '/sbin/iptables-save > /etc/iptables/rules.v4',
    /(RedHat|CentOS)/ => '/sbin/iptables-save > /etc/sysconfig/iptables',
  },
  refreshonly => true,
}
Firewall {
  notify  => Exec['persist-firewall'],
  before  => Class['my_fw::post'],
  require => Class['my_fw::pre'],
}
Firewallchain {
  notify  => Exec['persist-firewall'],
}
resources { "firewall":
  purge => true
}

With the latest version, we now have in-built persistence, so this is no longer needed. However, you will still need some basic setup to define pre & post rules.

resources { "firewall":
  purge => true
}
Firewall {
  before  => Class['my_fw::post'],
  require => Class['my_fw::pre'],
}
class { ['my_fw::pre', 'my_fw::post']: }
class { 'firewall': }

Consult the the documentation below for more details around the classes my_fw::pre and my_fw::post.

Usage

There are two kinds of firewall rules you can use with Firewall: default rules and application-specific rules. Default rules apply to general firewall settings, whereas application-specific rules manage firewall settings of a specific application, node, etc.

All rules employ a numbering system in the resource’s title that is used for ordering. When titling your rules, make sure you prefix the rule with a number.

  000 this runs first
  999 this runs last

Default rules

You can place default rules in either my_fw::pre or my_fw::post, depending on when you would like them to run. Rules placed in the pre class will run first, rules in the post class, last.

Depending on the provider, the title of the rule can be stored using the comment feature of the underlying firewall subsystem. Values can match /^\d+[[:alpha:][:digit:][:punct:][:space:]]+$/.

Examples of default rules

Basic accept ICMP request example:

firewall { "000 accept all icmp requests":
  proto  => "icmp",
  action => "accept",
}

Drop all:

firewall { "999 drop all other requests":
  action => "drop",
}

Application-specific rules

Application-specific rules can live anywhere you declare the firewall resource. It is best to put your firewall rules close to the service that needs it, such as in the module that configures it.

You should be able to add firewall rules to your application-specific classes so firewalling is performed at the same time when the class is invoked.

For example, if you have an Apache module, you could declare the class as below

class apache {
  firewall { '100 allow http and https access':
    port   => [80, 443],
    proto  => tcp,
    action => accept,
  }
  # ... the rest of your code ...
}

When someone uses the class, firewalling is provided automatically.

class { 'apache': }

Other rules

You can also apply firewall rules to specific nodes. Usually, you will want to put the firewall rule in another class and apply that class to a node. But you can apply a rule to a node.

node 'foo.bar.com' {
  firewall { '111 open port 111':
    dport => 111
  }
}

You can also do more complex things with the firewall resource. Here we are doing some NAT configuration.

firewall { '100 snat for network foo2':
  chain    => 'POSTROUTING',
  jump     => 'MASQUERADE',
  proto    => 'all',
  outiface => "eth0",
  source   => '10.1.2.0/24',
  table    => 'nat',
}

In the below example, we are creating a new chain and forwarding any port 5000 access to it.

firewall { '100 forward to MY_CHAIN':
  chain   => 'INPUT',
  jump    => 'MY_CHAIN',
}
# The namevar here is in the format chain_name:table:protocol
firewallchain { 'MY_CHAIN:filter:IPv4':
  ensure  => present,
}
firewall { '100 my rule':
  chain   => 'MY_CHAIN',
  action  => 'accept',
  proto   => 'tcp',
  dport   => 5000,
}

Additional Information

You can access the inline documentation:

puppet describe firewall

Or

puppet doc -r type
(and search for firewall)

Reference

Classes:

• firewall

Types:

• firewall
• firewallchain

Facts:

• ip6tables_version
• iptables_version
• iptables_persistent_version

Class: firewall

This class is provided to do the basic setup tasks required for using the firewall resources.

At the moment this takes care of:

• iptables-persistent package installation

You should include the class for nodes that need to use the resources in this module. For example

class { 'firewall': }

ensure

Indicates the state of iptables on your system, allowing you to disable iptables if desired.

Can either be running or stopped. Default to running.

Type: firewall

This type provides the capability to manage firewall rules within puppet.

For more documentation on the type, access the ‘Types’ tab on the Puppet Labs Forge:

http://forge.puppetlabs.com/puppetlabs/firewall#types

Type:: firewallchain

This type provides the capability to manage rule chains for firewalls.

For more documentation on the type, access the ‘Types’ tab on the Puppet Labs Forge:

http://forge.puppetlabs.com/puppetlabs/firewall#types

Fact: ip6tables_version

The module provides a Facter fact that can be used to determine what the default version of ip6tables is for your operating system/distribution.

Fact: iptables_version

The module provides a Facter fact that can be used to determine what the default version of iptables is for your operating system/distribution.

Fact: iptables_persistent_version

Retrieves the version of iptables-persistent from your OS. This is a Debian/Ubuntu specific fact.

Limitations

Please note, we only aim support for the following distributions and versions

• Redhat 5.8 or greater
• Debian 6.0 or greater
• Ubuntu 11.04 or greater

If you want a new distribution supported feel free to raise a ticket and we’ll consider it. If you want an older revision supported we’ll also consider it, but don’t get insulted if we reject it. Specifically, we will not consider Redhat 4.x support - its just too old.

Also, as this is a 0.x release the API is still in flux and may change. Make sure you read the release notes before upgrading.

Bugs can be reported using Github Issues:

http://github.com/puppetlabs/puppetlabs-firewall/issues

Development

Puppet Labs modules on the Puppet Forge are open projects, and community contributions are essential for keeping them great. We can’t access the huge number of platforms and myriad of hardware, software, and deployment configurations that Puppet is intended to serve.

We want to keep it as easy as possible to contribute changes so that our modules work in your environment. There are a few guidelines that we need contributors to follow so that we can have a chance of keeping on top of things.

You can read the complete module contribution guide on the Puppet Labs wiki.

For this particular module, please also read CONTRIBUTING.md before contributing.

Currently we support:

• iptables
• ip6tables
• ebtables (chains only)

But plans are to support lots of other firewall implementations:

• FreeBSD (ipf)
• Mac OS X (ipfw)
• OpenBSD (pf)
• Cisco (ASA and basic access lists)

If you have knowledge in these technologies, know how to code, and wish to contribute to this project, we would welcome the help.

Testing

Make sure you have:

• rake
• bundler

Install the necessary gems:

bundle install

And run the tests from the root of the source code:

rake test

If you have a copy of Vagrant 1.1.0 you can also run the system tests:

RSPEC_SET=debian-606-x64 rake spec:system
RSPEC_SET=centos-58-x64 rake spec:system

Note: system testing is fairly alpha at this point, your mileage may vary.

## puppetlabs-firewall changelog

Release notes for puppetlabs-firewall module.

---------------------------------------

#### 0.3.0 - 2013/4/25

This release introduces support for Arch Linux and extends support for Fedora 15 and up. There are also lots of bugs fixed and improved testing to prevent regressions.

##### Changes

* Fix error reporting for insane hostnames (Tomas Doran)
* Support systemd on Fedora 15 and up (Eduardo Gutierrez)
* Move examples to docs (Ken Barber)
* Add support for Arch Linux platform (Ingmar Steen)
* Add match rule for fragments (Georg Koester)
* Fix boolean rules being recognized as changed (Georg Koester)
* Same rules now get deleted (Anastasis Andronidis)
* Socket params test (Ken Barber)
* Ensure parameter can disable firewall (Marc Tardif)

---------------------------------------

#### 0.2.1 - 2012/3/13

This maintenance release introduces the new README layout, and fixes a bug with iptables_persistent_version.

##### Changes

* (GH-139) Throw away STDERR from dpkg-query in Fact
* Update README to be consistent with module documentation template
* Fix failing spec tests due to dpkg change in iptables_persistent_version

---------------------------------------

#### 0.2.0 - 2012/3/3

This release introduces automatic persistence, removing the need for the previous manual dependency requirement for persistent the running rules to the OS persistence file.

Previously you would have required the following in your site.pp (or some other global location):

    # Always persist firewall rules
    exec { 'persist-firewall':
      command     => $operatingsystem ? {
        'debian'          => '/sbin/iptables-save > /etc/iptables/rules.v4',
        /(RedHat|CentOS)/ => '/sbin/iptables-save > /etc/sysconfig/iptables',
      },
      refreshonly => true,
    }
    Firewall {
      notify  => Exec['persist-firewall'],
      before  => Class['my_fw::post'],
      require => Class['my_fw::pre'],
    }
    Firewallchain {
      notify  => Exec['persist-firewall'],
    }
    resources { "firewall":
      purge => true
    }

You only need:

    class { 'firewall': }
    Firewall {
      before  => Class['my_fw::post'],
      require => Class['my_fw::pre'],
    }

To install pre-requisites and to create dependencies on your pre & post rules. Consult the README for more information.

##### Changes

* Firewall class manifests (Dan Carley)
* Firewall and firewallchain persistence (Dan Carley)
* (GH-134) Autorequire iptables related packages (Dan Carley)
* Typo in #persist_iptables OS normalisation (Dan Carley)
* Tests for #persist_iptables (Dan Carley)
* (GH-129) Replace errant return in autoreq block (Dan Carley)

---------------------------------------

#### 0.1.1 - 2012/2/28

This release primarily fixes changing parameters in 3.x

##### Changes

* (GH-128) Change method_missing usage to define_method for 3.x compatibility
* Update travis.yml gem specifications to actually test 2.6
* Change source in Gemfile to use a specific URL for Ruby 2.0.0 compatibility

---------------------------------------

#### 0.1.0 - 2012/2/24

This release is somewhat belated, so no summary as there are far too many changes this time around. Hopefully we won't fall this far behind again :-).

##### Changes

* Add support for MARK target and set-mark property (Johan Huysmans)
* Fix broken call to super for ruby-1.9.2 in munge (Ken Barber)
* simple fix of the error message for allowed values of the jump property (Daniel Black)
* Adding OSPF(v3) protocol to puppetlabs-firewall (Arnoud Vermeer)
* Display multi-value: port, sport, dport and state command seperated (Daniel Black)
* Require jump=>LOG for log params (Daniel Black)
* Reject and document icmp => "any" (Dan Carley)
* add firewallchain type and iptables_chain provider (Daniel Black)
* Various fixes for firewallchain resource (Ken Barber)
* Modify firewallchain name to be chain:table:protocol (Ken Barber)
* Fix allvalidchain iteration (Ken Barber)
* Firewall autorequire Firewallchains (Dan Carley)
* Tests and docstring for chain autorequire (Dan Carley)
* Fix README so setup instructions actually work (Ken Barber)
* Support vlan interfaces (interface containing ".") (Johan Huysmans)
* Add tests for VLAN support for iniface/outiface (Ken Barber)
* Add the table when deleting rules (Johan Huysmans)
* Fix tests since we are now prefixing -t)
* Changed 'jump' to 'action', commands to lower case (Jason Short)
* Support interface names containing "+" (Simon Deziel)
* Fix for when iptables-save spews out "FATAL" errors (Sharif Nassar)
* Fix for incorrect limit command arguments for ip6tables provider (Michael Hsu)
* Document Util::Firewall.host_to_ip (Dan Carley)
* Nullify addresses with zero prefixlen (Dan Carley)
* Add support for --tcp-flags (Thomas Vander Stichele)
* Make tcp_flags support a feature (Ken Barber)
* OUTPUT is a valid chain for the mangle table (Adam Gibbins)
* Enable travis-ci support (Ken Barber)
* Convert an existing test to CIDR (Dan Carley)
* Normalise iptables-save to CIDR (Dan Carley)
* be clearer about what distributions we support (Ken Barber)
* add gre protocol to list of acceptable protocols (Jason Hancock)
* Added pkttype property (Ashley Penney)
* Fix mark to not repeat rules with iptables 1.4.1+ (Sharif Nassar)
* Stub iptables_version for now so tests run on non-Linux hosts (Ken Barber)
* Stub iptables facts for set_mark tests (Dan Carley)
* Update formatting of README to meet Puppet Labs best practices (Will Hopper)
* Support for ICMP6 type code resolutions (Dan Carley)
* Insert order hash included chains from different tables (Ken Barber)
* rspec 2.11 compatibility (Jonathan Boyett)
* Add missing class declaration in README (sfozz)
* array_matching is contraindicated (Sharif Nassar)
* Convert port Fixnum into strings (Sharif Nassar)
* Update test framework to the modern age (Ken Barber)
* working with ip6tables support (wuwx)
* Remove gemfile.lock and add to gitignore (William Van Hevelingen)
* Update travis and gemfile to be like stdlib travis files (William Van Hevelingen)
* Add support for -m socket option (Ken Barber)
* Add support for single --sport and --dport parsing (Ken Barber)
* Fix tests for Ruby 1.9.3 from 3e13bf3 (Dan Carley)
* Mock Resolv.getaddress in #host_to_ip (Dan Carley)
* Update docs for source and dest - they are not arrays (Ken Barber)

---------------------------------------

#### 0.0.4 - 2011/12/05

This release adds two new parameters, 'uid' and 'gid'. As a part of the owner module, these params allow you to specify a uid, username, gid, or group got a match:

    firewall { '497 match uid':
      port => '123',
      proto => 'mangle',
      chain => 'OUTPUT',
      action => 'drop'
      uid => '123'
    }

This release also adds value munging for the 'log_level', 'source', and 'destination' parameters. The 'source' and 'destination' now support hostnames:

    firewall { '498 accept from puppetlabs.com':
      port => '123',
      proto => 'tcp',
      source => 'puppetlabs.com',
      action => 'accept'
    }


The 'log_level' parameter now supports using log level names, such as 'warn', 'debug', and 'panic':

    firewall { '499 logging':
      port => '123',
      proto => 'udp',
      log_level => 'debug',
      action => 'drop'
    }

Additional changes include iptables and ip6tables version facts, general whitespace cleanup, and adding additional unit tests.

##### Changes

* (#10957) add iptables_version and ip6tables_version facts
* (#11093) Improve log_level property so it converts names to numbers
* (#10723) Munge hostnames and IPs to IPs with CIDR
* (#10718) Add owner-match support
* (#10997) Add fixtures for ipencap
* (#11034) Whitespace cleanup
* (#10690) add port property support to ip6tables

---------------------------------------

#### 0.0.3 - 2011/11/12

This release introduces a new parameter 'port' which allows you to set both
source and destination ports for a match:

    firewall { "500 allow NTP requests":
      port => "123",
      proto => "udp",
      action => "accept",
    }

We also have the limit parameter finally working:

    firewall { "500 limit HTTP requests":
      dport => 80,
      proto => tcp,
      limit => "60/sec",
      burst => 30,
      action => accept,
    }

State ordering has been fixed now, and more characters are allowed in the
namevar:

* Alphabetical
* Numbers
* Punctuation
* Whitespace

##### Changes

* (#10693) Ensure -m limit is added for iptables when using 'limit' param
* (#10690) Create new port property
* (#10700) allow additional characters in comment string
* (#9082) Sort iptables --state option values internally to keep it consistent across runs
* (#10324) Remove extraneous whitespace from iptables rule line in spec tests

---------------------------------------

#### 0.0.2 - 2011/10/26

This is largely a maintanence and cleanup release, but includes the ability to
specify ranges of ports in the sport/dport parameter:

    firewall { "500 allow port range":
      dport => ["3000-3030","5000-5050"],
      sport => ["1024-65535"],
      action => "accept",
    }

##### Changes

* (#10295) Work around bug #4248 whereby the puppet/util paths are not being loaded correctly on the puppetmaster
* (#10002) Change to dport and sport to handle ranges, and fix handling of name to name to port
* (#10263) Fix tests on Puppet 2.6.x
* (#10163) Cleanup some of the inline documentation and README file to align with general forge usage

---------------------------------------

#### 0.0.1 - 2011/10/18

Initial release.

##### Changes

* (#9362) Create action property and perform transformation for accept, drop, reject value for iptables jump parameter
* (#10088) Provide a customised version of CONTRIBUTING.md
* (#10026) Re-arrange provider and type spec files to align with Puppet
* (#10026) Add aliases for test,specs,tests to Rakefile and provide -T as default
* (#9439) fix parsing and deleting existing rules
* (#9583) Fix provider detection for gentoo and unsupported linuxes for the iptables provider
* (#9576) Stub provider so it works properly outside of Linux
* (#9576) Align spec framework with Puppet core
* and lots of other earlier development tasks ...

Puppet Firewall Module - Puppet module for managing Firewalls

Copyright (C) 2011-2013 Puppet Labs, Inc.
Copyright (C) 2011 Jonathan Boyett
Copyright (C) 2011 Media Temple, Inc.

Some of the iptables code was taken from puppet-iptables which was:

Copyright (C) 2011 Bob.sh Limited
Copyright (C) 2008 Camptocamp Association
Copyright (C) 2007 Dmitri Priimak

Puppet Labs can be contacted at: info@puppetlabs.com

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.