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homeserver/ansible_collections/community/general/plugins/modules/system/ufw.py
mg c648a48c4c systemd: sanoid (#346) 
Co-authored-by: Michael Grote <michael.grote@posteo.de>
Reviewed-on: mg/ansible#346
Co-authored-by: mg <michael.grote@posteo.de>
Co-committed-by: mg <michael.grote@posteo.de>
2022-04-03 11:04:27 +02:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright: (c) 2014, Ahti Kitsik <ak@ahtik.com>
# Copyright: (c) 2014, Jarno Keskikangas <jarno.keskikangas@gmail.com>
# Copyright: (c) 2013, Aleksey Ovcharenko <aleksey.ovcharenko@gmail.com>
# Copyright: (c) 2013, James Martin <jmartin@basho.com>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import absolute_import, division, print_function
__metaclass__ = type
DOCUMENTATION = r'''
---
module: ufw
short_description: Manage firewall with UFW
description:
- Manage firewall with UFW.
author:
- Aleksey Ovcharenko (@ovcharenko)
- Jarno Keskikangas (@pyykkis)
- Ahti Kitsik (@ahtik)
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.
type: str
choices: [ disabled, enabled, reloaded, reset ]
default:
description:
- Change the default policy for incoming or outgoing traffic.
type: str
choices: [ allow, deny, reject ]
aliases: [ policy ]
direction:
description:
- Select direction for a rule or default policy command. Mutually
exclusive with I(interface_in) and I(interface_out).
type: str
choices: [ in, incoming, out, outgoing, routed ]
logging:
description:
- Toggles logging. Logged packets use the LOG_KERN syslog facility.
type: str
choices: [ 'on', 'off', low, medium, high, full ]
insert:
description:
- Insert the corresponding rule as rule number NUM.
- Note that ufw numbers rules starting with 1.
- If I(delete=true) and a value is provided for I(insert),
then I(insert) is ignored.
type: int
insert_relative_to:
description:
- Allows to interpret the index in I(insert) relative to a position.
- C(zero) interprets the rule number as an absolute index (i.e. 1 is
the first rule).
- C(first-ipv4) interprets the rule number relative to the index of the
first IPv4 rule, or relative to the position where the first IPv4 rule
would be if there is currently none.
- C(last-ipv4) interprets the rule number relative to the index of the
last IPv4 rule, or relative to the position where the last IPv4 rule
would be if there is currently none.
- C(first-ipv6) interprets the rule number relative to the index of the
first IPv6 rule, or relative to the position where the first IPv6 rule
would be if there is currently none.
- C(last-ipv6) interprets the rule number relative to the index of the
last IPv6 rule, or relative to the position where the last IPv6 rule
would be if there is currently none.
type: str
choices: [ first-ipv4, first-ipv6, last-ipv4, last-ipv6, zero ]
default: zero
rule:
description:
- Add firewall rule
type: str
choices: [ allow, deny, limit, reject ]
log:
description:
- Log new connections matched to this rule
type: bool
default: false
from_ip:
description:
- Source IP address.
type: str
default: any
aliases: [ from, src ]
from_port:
description:
- Source port.
type: str
to_ip:
description:
- Destination IP address.
type: str
default: any
aliases: [ dest, to]
to_port:
description:
- Destination port.
type: str
aliases: [ port ]
proto:
description:
- TCP/IP protocol.
type: str
choices: [ any, tcp, udp, ipv6, esp, ah, gre, igmp ]
aliases: [ protocol ]
name:
description:
- Use profile located in C(/etc/ufw/applications.d).
type: str
aliases: [ app ]
delete:
description:
- Delete rule.
- If I(delete=true) and a value is provided for I(insert),
then I(insert) is ignored.
type: bool
default: false
interface:
description:
- Specify interface for the rule. The direction (in or out) used
for the interface depends on the value of I(direction). See
I(interface_in) and I(interface_out) for routed rules that needs
to supply both an input and output interface. Mutually
exclusive with I(interface_in) and I(interface_out).
type: str
aliases: [ if ]
interface_in:
description:
- Specify input interface for the rule. This is mutually
exclusive with I(direction) and I(interface). However, it is
compatible with I(interface_out) for routed rules.
type: str
aliases: [ if_in ]
version_added: '0.2.0'
interface_out:
description:
- Specify output interface for the rule. This is mutually
exclusive with I(direction) and I(interface). However, it is
compatible with I(interface_in) for routed rules.
type: str
aliases: [ if_out ]
version_added: '0.2.0'
route:
description:
- Apply the rule to routed/forwarded packets.
type: bool
default: false
comment:
description:
- Add a comment to the rule. Requires UFW version >=0.35.
type: str
'''
EXAMPLES = r'''
- name: Allow everything and enable UFW
community.general.ufw:
state: enabled
policy: allow
- name: Set logging
community.general.ufw:
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:
- community.general.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:
- community.general.ufw:
rule: limit
port: ssh
proto: tcp
# Allow OpenSSH. (Note that as ufw manages its own state, simply removing
# a rule=allow task can leave those ports exposed. Either use delete=yes
# or a separate state=reset task)
- community.general.ufw:
rule: allow
name: OpenSSH
- name: Delete OpenSSH rule
community.general.ufw:
rule: allow
name: OpenSSH
delete: yes
- name: Deny all access to port 53
community.general.ufw:
rule: deny
port: '53'
- name: Allow port range 60000-61000
community.general.ufw:
rule: allow
port: 60000:61000
proto: tcp
- name: Allow all access to tcp port 80
community.general.ufw:
rule: allow
port: '80'
proto: tcp
- name: Allow all access from RFC1918 networks to this host
community.general.ufw:
rule: allow
src: '{{ item }}'
loop:
- 10.0.0.0/8
- 172.16.0.0/12
- 192.168.0.0/16
- name: Deny access to udp port 514 from host 1.2.3.4 and include a comment
community.general.ufw:
rule: deny
proto: udp
src: 1.2.3.4
port: '514'
comment: Block syslog
- name: Allow incoming access to eth0 from 1.2.3.5 port 5469 to 1.2.3.4 port 5469
community.general.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'
# Note that IPv6 must be enabled in /etc/default/ufw for IPv6 firewalling to work.
- name: Deny all traffic from the IPv6 2001:db8::/32 to tcp port 25 on this host
community.general.ufw:
rule: deny
proto: tcp
src: 2001:db8::/32
port: '25'
- name: Deny all IPv6 traffic to tcp port 20 on this host
# this should be the first IPv6 rule
community.general.ufw:
rule: deny
proto: tcp
port: '20'
to_ip: "::"
insert: 0
insert_relative_to: first-ipv6
- name: Deny all IPv4 traffic to tcp port 20 on this host
# This should be the third to last IPv4 rule
# (insert: -1 addresses the second to last IPv4 rule;
# so the new rule will be inserted before the second
# to last IPv4 rule, and will be come the third to last
# IPv4 rule.)
community.general.ufw:
rule: deny
proto: tcp
port: '20'
to_ip: "::"
insert: -1
insert_relative_to: last-ipv4
# Can be used to further restrict a global FORWARD policy set to allow
- name: Deny forwarded/routed traffic from subnet 1.2.3.0/24 to subnet 4.5.6.0/24
community.general.ufw:
rule: deny
route: yes
src: 1.2.3.0/24
dest: 4.5.6.0/24
'''
import re
from operator import itemgetter
from ansible.module_utils.basic import AnsibleModule
def compile_ipv4_regexp():
r = r"((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}"
r += r"(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])"
return re.compile(r)
def compile_ipv6_regexp():
"""
validation pattern provided by :
https://stackoverflow.com/questions/53497/regular-expression-that-matches-
valid-ipv6-addresses#answer-17871737
"""
r = r"(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:"
r += r"|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}"
r += r"(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4})"
r += r"{1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]"
r += r"{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]"
r += r"{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4})"
r += r"{0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]"
r += r"|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}"
r += r"[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}"
r += r"[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))"
return re.compile(r)
def main():
command_keys = ['state', 'default', 'rule', 'logging']
module = AnsibleModule(
argument_spec=dict(
state=dict(type='str', choices=['enabled', 'disabled', 'reloaded', 'reset']),
default=dict(type='str', aliases=['policy'], choices=['allow', 'deny', 'reject']),
logging=dict(type='str', choices=['full', 'high', 'low', 'medium', 'off', 'on']),
direction=dict(type='str', choices=['in', 'incoming', 'out', 'outgoing', 'routed']),
delete=dict(type='bool', default=False),
route=dict(type='bool', default=False),
insert=dict(type='int'),
insert_relative_to=dict(choices=['zero', 'first-ipv4', 'last-ipv4', 'first-ipv6', 'last-ipv6'], default='zero'),
rule=dict(type='str', choices=['allow', 'deny', 'limit', 'reject']),
interface=dict(type='str', aliases=['if']),
interface_in=dict(type='str', aliases=['if_in']),
interface_out=dict(type='str', aliases=['if_out']),
log=dict(type='bool', default=False),
from_ip=dict(type='str', default='any', aliases=['from', 'src']),
from_port=dict(type='str'),
to_ip=dict(type='str', default='any', aliases=['dest', 'to']),
to_port=dict(type='str', aliases=['port']),
proto=dict(type='str', aliases=['protocol'], choices=['ah', 'any', 'esp', 'ipv6', 'tcp', 'udp', 'gre', 'igmp']),
name=dict(type='str', aliases=['app']),
comment=dict(type='str'),
),
supports_check_mode=True,
mutually_exclusive=[
['name', 'proto', 'logging'],
# Mutual exclusivity with `interface` implied by `required_by`.
['direction', 'interface_in'],
['direction', 'interface_out'],
],
required_one_of=([command_keys]),
required_by=dict(
interface=('direction', ),
),
)
cmds = []
ipv4_regexp = compile_ipv4_regexp()
ipv6_regexp = compile_ipv6_regexp()
def filter_line_that_not_start_with(pattern, content):
return ''.join([line for line in content.splitlines(True) if line.startswith(pattern)])
def filter_line_that_contains(pattern, content):
return [line for line in content.splitlines(True) if pattern in line]
def filter_line_that_not_contains(pattern, content):
return ''.join([line for line in content.splitlines(True) if not line.contains(pattern)])
def filter_line_that_match_func(match_func, content):
return ''.join([line for line in content.splitlines(True) if match_func(line) is not None])
def filter_line_that_contains_ipv4(content):
return filter_line_that_match_func(ipv4_regexp.search, content)
def filter_line_that_contains_ipv6(content):
return filter_line_that_match_func(ipv6_regexp.search, content)
def is_starting_by_ipv4(ip):
return ipv4_regexp.match(ip) is not None
def is_starting_by_ipv6(ip):
return ipv6_regexp.match(ip) is not None
def execute(cmd, ignore_error=False):
cmd = ' '.join(map(itemgetter(-1), filter(itemgetter(0), cmd)))
cmds.append(cmd)
(rc, out, err) = module.run_command(cmd, environ_update={"LANG": "C"})
if rc != 0 and not ignore_error:
module.fail_json(msg=err or out, commands=cmds)
return out
def get_current_rules():
user_rules_files = ["/lib/ufw/user.rules",
"/lib/ufw/user6.rules",
"/etc/ufw/user.rules",
"/etc/ufw/user6.rules",
"/var/lib/ufw/user.rules",
"/var/lib/ufw/user6.rules"]
cmd = [[grep_bin], ["-h"], ["'^### tuple'"]]
cmd.extend([[f] for f in user_rules_files])
return execute(cmd, ignore_error=True)
def ufw_version():
"""
Returns the major and minor version of ufw installed on the system.
"""
out = execute([[ufw_bin], ["--version"]])
lines = [x for x in out.split('\n') if x.strip() != '']
if len(lines) == 0:
module.fail_json(msg="Failed to get ufw version.", rc=0, out=out)
matches = re.search(r'^ufw.+(\d+)\.(\d+)(?:\.(\d+))?.*$', lines[0])
if matches is None:
module.fail_json(msg="Failed to get ufw version.", rc=0, out=out)
# Convert version to numbers
major = int(matches.group(1))
minor = int(matches.group(2))
rev = 0
if matches.group(3) is not None:
rev = int(matches.group(3))
return major, minor, rev
params = module.params
commands = dict((key, params[key]) for key in command_keys if params[key])
# Ensure ufw is available
ufw_bin = module.get_bin_path('ufw', True)
grep_bin = module.get_bin_path('grep', True)
# Save the pre state and rules in order to recognize changes
pre_state = execute([[ufw_bin], ['status verbose']])
pre_rules = get_current_rules()
changed = False
# Execute filter
for (command, value) in commands.items():
cmd = [[ufw_bin], [module.check_mode, '--dry-run']]
if command == 'state':
states = {'enabled': 'enable', 'disabled': 'disable',
'reloaded': 'reload', 'reset': 'reset'}
if value in ['reloaded', 'reset']:
changed = True
if module.check_mode:
# "active" would also match "inactive", hence the space
ufw_enabled = pre_state.find(" active") != -1
if (value == 'disabled' and ufw_enabled) or (value == 'enabled' and not ufw_enabled):
changed = True
else:
execute(cmd + [['-f'], [states[value]]])
elif command == 'logging':
extract = re.search(r'Logging: (on|off)(?: \(([a-z]+)\))?', pre_state)
if extract:
current_level = extract.group(2)
current_on_off_value = extract.group(1)
if value != "off":
if current_on_off_value == "off":
changed = True
elif value != "on" and value != current_level:
changed = True
elif current_on_off_value != "off":
changed = True
else:
changed = True
if not module.check_mode:
execute(cmd + [[command], [value]])
elif command == 'default':
if params['direction'] not in ['outgoing', 'incoming', 'routed', None]:
module.fail_json(msg='For default, direction must be one of "outgoing", "incoming" and "routed", or direction must not be specified.')
if module.check_mode:
regexp = r'Default: (deny|allow|reject) \(incoming\), (deny|allow|reject) \(outgoing\), (deny|allow|reject|disabled) \(routed\)'
extract = re.search(regexp, pre_state)
if extract is not None:
current_default_values = {}
current_default_values["incoming"] = extract.group(1)
current_default_values["outgoing"] = extract.group(2)
current_default_values["routed"] = extract.group(3)
v = current_default_values[params['direction'] or 'incoming']
if v not in (value, 'disabled'):
changed = True
else:
changed = True
else:
execute(cmd + [[command], [value], [params['direction']]])
elif command == 'rule':
if params['direction'] not in ['in', 'out', None]:
module.fail_json(msg='For rules, direction must be one of "in" and "out", or direction must not be specified.')
if not params['route'] and params['interface_in'] and params['interface_out']:
module.fail_json(msg='Only route rules can combine '
'interface_in and interface_out')
# Rules are constructed according to the long format
#
# ufw [--dry-run] [route] [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] [comment COMMENT]
cmd.append([module.boolean(params['route']), 'route'])
cmd.append([module.boolean(params['delete']), 'delete'])
if params['insert'] is not None and not params['delete']:
relative_to_cmd = params['insert_relative_to']
if relative_to_cmd == 'zero':
insert_to = params['insert']
else:
(dummy, numbered_state, dummy) = module.run_command([ufw_bin, 'status', 'numbered'])
numbered_line_re = re.compile(R'^\[ *([0-9]+)\] ')
lines = [(numbered_line_re.match(line), '(v6)' in line) for line in numbered_state.splitlines()]
lines = [(int(matcher.group(1)), ipv6) for (matcher, ipv6) in lines if matcher]
last_number = max([no for (no, ipv6) in lines]) if lines else 0
has_ipv4 = any(not ipv6 for (no, ipv6) in lines)
has_ipv6 = any(ipv6 for (no, ipv6) in lines)
if relative_to_cmd == 'first-ipv4':
relative_to = 1
elif relative_to_cmd == 'last-ipv4':
relative_to = max([no for (no, ipv6) in lines if not ipv6]) if has_ipv4 else 1
elif relative_to_cmd == 'first-ipv6':
relative_to = max([no for (no, ipv6) in lines if not ipv6]) + 1 if has_ipv4 else 1
elif relative_to_cmd == 'last-ipv6':
relative_to = last_number if has_ipv6 else last_number + 1
insert_to = params['insert'] + relative_to
if insert_to > last_number:
# ufw does not like it when the insert number is larger than the
# maximal rule number for IPv4/IPv6.
insert_to = None
cmd.append([insert_to is not None, "insert %s" % insert_to])
cmd.append([value])
cmd.append([params['direction'], "%s" % params['direction']])
cmd.append([params['interface'], "on %s" % params['interface']])
cmd.append([params['interface_in'], "in on %s" % params['interface_in']])
cmd.append([params['interface_out'], "out on %s" % params['interface_out']])
cmd.append([module.boolean(params['log']), 'log'])
for (key, template) in [('from_ip', "from %s"), ('from_port', "port %s"),
('to_ip', "to %s"), ('to_port', "port %s"),
('proto', "proto %s"), ('name', "app '%s'")]:
value = params[key]
cmd.append([value, template % (value)])
ufw_major, ufw_minor, dummy = ufw_version()
# comment is supported only in ufw version after 0.35
if (ufw_major == 0 and ufw_minor >= 35) or ufw_major > 0:
cmd.append([params['comment'], "comment '%s'" % params['comment']])
rules_dry = execute(cmd)
if module.check_mode:
nb_skipping_line = len(filter_line_that_contains("Skipping", rules_dry))
if not (nb_skipping_line > 0 and nb_skipping_line == len(rules_dry.splitlines(True))):
rules_dry = filter_line_that_not_start_with("### tuple", rules_dry)
# ufw dry-run doesn't send all rules so have to compare ipv4 or ipv6 rules
if is_starting_by_ipv4(params['from_ip']) or is_starting_by_ipv4(params['to_ip']):
if filter_line_that_contains_ipv4(pre_rules) != filter_line_that_contains_ipv4(rules_dry):
changed = True
elif is_starting_by_ipv6(params['from_ip']) or is_starting_by_ipv6(params['to_ip']):
if filter_line_that_contains_ipv6(pre_rules) != filter_line_that_contains_ipv6(rules_dry):
changed = True
elif pre_rules != rules_dry:
changed = True
# Get the new state
if module.check_mode:
return module.exit_json(changed=changed, commands=cmds)
else:
post_state = execute([[ufw_bin], ['status'], ['verbose']])
if not changed:
post_rules = get_current_rules()
changed = (pre_state != post_state) or (pre_rules != post_rules)
return module.exit_json(changed=changed, commands=cmds, msg=post_state.rstrip())
if __name__ == '__main__':
main()
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