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ansible/system/ufw

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2014, Jarno Keskikangas <jarno.keskikangas@gmail.com>
# (c) 2013, Aleksey Ovcharenko <aleksey.ovcharenko@gmail.com>
# (c) 2013, James Martin <jmartin@basho.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
DOCUMENTATION = '''
---
module: ufw
short_description: Manage firewall with UFW
description:
- Manage firewall with UFW.
version_added: 1.6
author: Aleksey Ovcharenko, Jarno Keskikangas
notes:
- See C(man ufw) for more examples.
requirements:
- C(ufw) package
options:
state:
description:
- C(enabled) reloads firewall and enables firewall on boot.
- C(disabled) unloads firewall and disables firewall on boot.
- C(reloaded) reloads firewall.
- C(reset) disables and resets firewall to installation defaults.
required: false
choices: ['enabled', 'disabled', 'reloaded', 'reset']
policy:
description:
- Change the default policy for incoming or outgoing traffic.
required: false
alias: default
choices: ['allow', 'deny', 'reject']
direction:
description:
- Select direction for a rule or default policy command.
required: false
choices: ['in', 'out', 'incoming', 'outgoing']
logging:
description:
- Toggles logging. Logged packets use the LOG_KERN syslog facility.
choices: ['on', 'off', 'low', 'medium', 'high', 'full']
required: false
insert:
description:
- Insert the corresponding rule as rule number NUM
required: false
rule:
description:
- Add firewall rule
required: false
choises: ['allow', 'deny', 'reject', 'limit']
log:
description:
- Log new connections matched to this rule
required: false
choises: ['yes', 'no']
from_ip:
description:
- Source IP address.
required: false
aliases: ['from', 'src']
default: 'any'
from_port:
description:
- Source port.
required: false
to_ip:
description:
- Destination IP address.
required: false
aliases: ['to', 'dest']
default: 'any'
to_port:
description:
- Destination port.
required: false
aliases: ['port']
proto:
description:
- TCP/IP protocol.
choices: ['any', 'tcp', 'udp', 'ipv6', 'esp', 'ah']
required: false
name:
description:
- Use profile located in C(/etc/ufw/applications.d)
required: false
aliases: ['app']
delete:
description:
- Delete rule.
required: false
choices: ['yes', 'no']
'''
EXAMPLES = '''
# Allow everything and enable UFW
ufw: state=enable policy=allow logging=on
# Sometimes it is desirable to let the sender know when traffic is
# being denied, rather than simply ignoring it. In these cases, use
# reject instead of deny. In addition, log rejected connections:
ufw: rule=reject port=auth log=yes
# ufw supports connection rate limiting, which is useful for protecting
# against brute-force login attacks. ufw will deny connections if an IP
# address has attempted to initiate 6 or more connections in the last
# 30 seconds. See http://www.debian-administration.org/articles/187
# for details. Typical usage is:
ufw: rule=limit port=ssh proto=tcp
# Allow OpenSSH
ufw: rule=allow name=OpenSSH
# Delete OpenSSH rule
ufw: rule=allow name=OpenSSH delete=yes
# Deny all access to port 53:
ufw: rule=deny port=53
# Allow all access to tcp port 80:
ufw: rule=allow port=80 proto=tcp
# Allow all access from RFC1918 networks to this host:
ufw: rule=allow src={{ item }}
with_items:
- 10.0.0.0/8
- 172.16.0.0/12
- 192.168.0.0/16
# Deny access to udp port 514 from host 1.2.3.4:
ufw: rule=deny proto=udp src=1.2.3.4 port=514
# Allow incoming access to eth0 from 1.2.3.5 port 5469 to 1.2.3.4 port 5469
ufw: rule=allow interface=eth0 direction=in proto=udp src=1.2.3.5 from_port=5469 dest=1.2.3.4 to_port=5469
# Deny all traffic from the IPv6 2001:db8::/32 to tcp port 25 on this host.
# Note that IPv6 must be enabled in /etc/default/ufw for IPv6 firewalling to work.
ufw: rule=deny proto=tcp src=2001:db8::/32 port=25
'''
from operator import itemgetter
def main():
module = AnsibleModule(
argument_spec = dict(
state = dict(default=None, choices=['enabled', 'disabled', 'reloaded', 'reset']),
default = dict(default=None, aliases=['policy'], choices=['allow', 'deny', 'reject']),
logging = dict(default=None, choises=['on', 'off', 'low', 'medium', 'high', 'full']),
direction = dict(default=None, choises=['in', 'incoming', 'out', 'outgoing']),
delete = dict(default=False, type='bool'),
insert = dict(default=None),
rule = dict(default=None, choices=['allow', 'deny', 'reject', 'limit']),
interface = dict(default=None, aliases=['if']),
log = dict(default=False, type='bool'),
from_ip = dict(default='any', aliases=['src', 'from']),
from_port = dict(default=None),
to_ip = dict(default='any', aliases=['dest', 'to']),
to_port = dict(default=None, aliases=['port']),
proto = dict(default=None, aliases=['protocol'], choices=['any', 'tcp', 'udp', 'ipv6', 'esp', 'ah']),
app = dict(default=None, aliases=['name'])
),
supports_check_mode = True,
mutually_exclusive = [['app', 'proto']]
)
cmds = []
def execute(cmd):
cmd = ' '.join(map(itemgetter(-1), filter(itemgetter(0), cmd)))
cmds.append(cmd)
(rc, out, err) = module.run_command(cmd)
if rc != 0:
module.fail_json(msg=err or out)
params = module.params
# Ensure at least one of the command arguments are given
command_keys = ['state', 'default', 'rule', 'logging']
commands = dict((key, params[key]) for key in command_keys if params[key])
if len(commands) < 1:
module.fail_json(msg="Not any of the command arguments %s given" % commands)
# Ensure ufw is available
ufw_bin = module.get_bin_path('ufw', True)
# Save the pre state and rules in order to recognize changes
(_, pre_state, _) = module.run_command(ufw_bin + ' status verbose')
(_, pre_rules, _) = module.run_command("grep '^### tuple' /lib/ufw/user*.rules")
# Execute commands
for (command, value) in commands.iteritems():
cmd = [[ufw_bin], [module.check_mode, '--dry-run']]
if command == 'state':
states = { 'enabled': 'enable', 'disabled': 'disable',
'reloaded': 'reload', 'reset': 'reset' }
execute(cmd + [['-f'], [states[value]]])
elif command == 'logging':
execute(cmd + [[command, value]])
elif command == 'default':
execute(cmd + [[command], [value], [params['direction']]])
elif command == 'rule':
# Rules are constructed according to the long format
#
# ufw [--dry-run] [delete] [insert NUM] allow|deny|reject|limit [in|out on INTERFACE] [log|log-all] \
# [from ADDRESS [port PORT]] [to ADDRESS [port PORT]] \
# [proto protocol] [app application]
cmd.append([module.boolean(params['delete']), 'delete'])
cmd.append([params['insert'], "insert %s" % params['insert']])
cmd.append([value])
cmd.append([module.boolean(params['log']), 'log'])
for (key, template) in [('direction', "%s" ), ('interface', "on %s" ),
('from_ip', "from %s" ), ('from_port', "port %s" ),
('to_ip', "to %s" ), ('to_port', "port %s" ),
('proto', "proto %s"), ('app', "app '%s'")]:
value = params[key]
cmd.append([value, template % (value)])
execute(cmd)
# Get the new state
(_, post_state, _) = module.run_command(ufw_bin + ' status verbose')
(_, post_rules, _) = module.run_command("grep '^### tuple' /lib/ufw/user*.rules")
changed = (pre_state != post_state) or (pre_rules != post_rules)
return module.exit_json(changed=changed, commands=cmds, msg=post_state.rstrip())
# import module snippets
from ansible.module_utils.basic import *
main()
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