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599 lines
22 KiB
Python
599 lines
22 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# Copyright: (c) 2014, Ahti Kitsik <ak@ahtik.com>
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# Copyright: (c) 2014, Jarno Keskikangas <jarno.keskikangas@gmail.com>
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# Copyright: (c) 2013, Aleksey Ovcharenko <aleksey.ovcharenko@gmail.com>
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# Copyright: (c) 2013, James Martin <jmartin@basho.com>
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import absolute_import, division, print_function
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__metaclass__ = type
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ANSIBLE_METADATA = {'metadata_version': '1.1',
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'status': ['preview'],
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'supported_by': 'community'}
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DOCUMENTATION = r'''
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---
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module: ufw
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short_description: Manage firewall with UFW
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description:
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- Manage firewall with UFW.
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version_added: 1.6
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author:
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- Aleksey Ovcharenko (@ovcharenko)
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- Jarno Keskikangas (@pyykkis)
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- Ahti Kitsik (@ahtik)
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notes:
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- See C(man ufw) for more examples.
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requirements:
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- C(ufw) package
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options:
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state:
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description:
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- C(enabled) reloads firewall and enables firewall on boot.
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- C(disabled) unloads firewall and disables firewall on boot.
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- C(reloaded) reloads firewall.
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- C(reset) disables and resets firewall to installation defaults.
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type: str
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choices: [ disabled, enabled, reloaded, reset ]
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default:
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description:
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- Change the default policy for incoming or outgoing traffic.
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type: str
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choices: [ allow, deny, reject ]
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aliases: [ policy ]
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direction:
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description:
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- Select direction for a rule or default policy command. Mutually
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exclusive with I(interface_in) and I(interface_out).
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type: str
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choices: [ in, incoming, out, outgoing, routed ]
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logging:
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description:
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- Toggles logging. Logged packets use the LOG_KERN syslog facility.
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type: str
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choices: [ 'on', 'off', low, medium, high, full ]
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insert:
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description:
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- Insert the corresponding rule as rule number NUM.
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- Note that ufw numbers rules starting with 1.
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type: int
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insert_relative_to:
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description:
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- Allows to interpret the index in I(insert) relative to a position.
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- C(zero) interprets the rule number as an absolute index (i.e. 1 is
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the first rule).
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- C(first-ipv4) interprets the rule number relative to the index of the
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first IPv4 rule, or relative to the position where the first IPv4 rule
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would be if there is currently none.
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- C(last-ipv4) interprets the rule number relative to the index of the
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last IPv4 rule, or relative to the position where the last IPv4 rule
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would be if there is currently none.
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- C(first-ipv6) interprets the rule number relative to the index of the
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first IPv6 rule, or relative to the position where the first IPv6 rule
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would be if there is currently none.
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- C(last-ipv6) interprets the rule number relative to the index of the
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last IPv6 rule, or relative to the position where the last IPv6 rule
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would be if there is currently none.
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type: str
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choices: [ first-ipv4, first-ipv6, last-ipv4, last-ipv6, zero ]
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default: zero
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version_added: "2.8"
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rule:
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description:
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- Add firewall rule
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type: str
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choices: [ allow, deny, limit, reject ]
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log:
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description:
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- Log new connections matched to this rule
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type: bool
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from_ip:
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description:
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- Source IP address.
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type: str
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default: any
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aliases: [ from, src ]
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from_port:
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description:
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- Source port.
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type: str
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to_ip:
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description:
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- Destination IP address.
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type: str
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default: any
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aliases: [ dest, to]
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to_port:
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description:
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- Destination port.
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type: str
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aliases: [ port ]
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proto:
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description:
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- TCP/IP protocol.
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type: str
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choices: [ any, tcp, udp, ipv6, esp, ah, gre, igmp ]
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aliases: [ protocol ]
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name:
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description:
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- Use profile located in C(/etc/ufw/applications.d).
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type: str
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aliases: [ app ]
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delete:
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description:
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- Delete rule.
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type: bool
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interface:
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description:
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- Specify interface for the rule. The direction (in or out) used
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for the interface depends on the value of I(direction). See
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I(interface_in) and I(interface_out) for routed rules that needs
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to supply both an input and output interface. Mutually
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exclusive with I(interface_in) and I(interface_out).
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type: str
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aliases: [ if ]
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interface_in:
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description:
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- Specify input interface for the rule. This is mutually
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exclusive with I(direction) and I(interface). However, it is
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compatible with I(interface_out) for routed rules.
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type: str
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aliases: [ if_in ]
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version_added: "2.10"
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interface_out:
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description:
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- Specify output interface for the rule. This is mutually
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exclusive with I(direction) and I(interface). However, it is
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compatible with I(interface_in) for routed rules.
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type: str
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aliases: [ if_out ]
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version_added: "2.10"
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route:
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description:
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- Apply the rule to routed/forwarded packets.
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type: bool
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comment:
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description:
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- Add a comment to the rule. Requires UFW version >=0.35.
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type: str
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version_added: "2.4"
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'''
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EXAMPLES = r'''
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- name: Allow everything and enable UFW
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ufw:
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state: enabled
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policy: allow
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- name: Set logging
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ufw:
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logging: 'on'
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# Sometimes it is desirable to let the sender know when traffic is
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# being denied, rather than simply ignoring it. In these cases, use
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# reject instead of deny. In addition, log rejected connections:
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- ufw:
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rule: reject
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port: auth
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log: yes
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# ufw supports connection rate limiting, which is useful for protecting
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# against brute-force login attacks. ufw will deny connections if an IP
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# address has attempted to initiate 6 or more connections in the last
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# 30 seconds. See http://www.debian-administration.org/articles/187
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# for details. Typical usage is:
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- ufw:
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rule: limit
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port: ssh
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proto: tcp
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# Allow OpenSSH. (Note that as ufw manages its own state, simply removing
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# a rule=allow task can leave those ports exposed. Either use delete=yes
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# or a separate state=reset task)
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- ufw:
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rule: allow
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name: OpenSSH
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- name: Delete OpenSSH rule
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ufw:
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rule: allow
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name: OpenSSH
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delete: yes
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- name: Deny all access to port 53
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ufw:
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rule: deny
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port: '53'
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- name: Allow port range 60000-61000
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ufw:
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rule: allow
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port: 60000:61000
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proto: tcp
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- name: Allow all access to tcp port 80
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ufw:
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rule: allow
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port: '80'
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proto: tcp
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- name: Allow all access from RFC1918 networks to this host
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ufw:
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rule: allow
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src: '{{ item }}'
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loop:
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- 10.0.0.0/8
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- 172.16.0.0/12
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- 192.168.0.0/16
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- name: Deny access to udp port 514 from host 1.2.3.4 and include a comment
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ufw:
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rule: deny
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proto: udp
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src: 1.2.3.4
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port: '514'
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comment: Block syslog
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- name: Allow incoming access to eth0 from 1.2.3.5 port 5469 to 1.2.3.4 port 5469
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ufw:
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rule: allow
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interface: eth0
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direction: in
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proto: udp
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src: 1.2.3.5
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from_port: '5469'
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dest: 1.2.3.4
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to_port: '5469'
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# Note that IPv6 must be enabled in /etc/default/ufw for IPv6 firewalling to work.
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- name: Deny all traffic from the IPv6 2001:db8::/32 to tcp port 25 on this host
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ufw:
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rule: deny
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proto: tcp
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src: 2001:db8::/32
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port: '25'
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- name: Deny all IPv6 traffic to tcp port 20 on this host
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# this should be the first IPv6 rule
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ufw:
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rule: deny
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proto: tcp
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port: '20'
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to_ip: "::"
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insert: 0
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insert_relative_to: first-ipv6
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- name: Deny all IPv4 traffic to tcp port 20 on this host
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# This should be the third to last IPv4 rule
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# (insert: -1 addresses the second to last IPv4 rule;
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# so the new rule will be inserted before the second
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# to last IPv4 rule, and will be come the third to last
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# IPv4 rule.)
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ufw:
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rule: deny
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proto: tcp
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port: '20'
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to_ip: "::"
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insert: -1
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insert_relative_to: last-ipv4
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# Can be used to further restrict a global FORWARD policy set to allow
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- name: Deny forwarded/routed traffic from subnet 1.2.3.0/24 to subnet 4.5.6.0/24
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ufw:
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rule: deny
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route: yes
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src: 1.2.3.0/24
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dest: 4.5.6.0/24
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'''
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import re
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from operator import itemgetter
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from ansible.module_utils.basic import AnsibleModule
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def compile_ipv4_regexp():
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r = r"((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}"
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r += r"(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])"
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return re.compile(r)
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def compile_ipv6_regexp():
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"""
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validation pattern provided by :
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https://stackoverflow.com/questions/53497/regular-expression-that-matches-
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valid-ipv6-addresses#answer-17871737
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"""
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r = r"(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:"
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r += r"|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}"
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r += r"(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4})"
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r += r"{1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]"
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r += r"{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]"
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r += r"{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4})"
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r += r"{0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]"
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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}"
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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}"
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r += r"[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))"
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return re.compile(r)
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def main():
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command_keys = ['state', 'default', 'rule', 'logging']
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module = AnsibleModule(
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argument_spec=dict(
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state=dict(type='str', choices=['enabled', 'disabled', 'reloaded', 'reset']),
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default=dict(type='str', aliases=['policy'], choices=['allow', 'deny', 'reject']),
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logging=dict(type='str', choices=['full', 'high', 'low', 'medium', 'off', 'on']),
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direction=dict(type='str', choices=['in', 'incoming', 'out', 'outgoing', 'routed']),
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delete=dict(type='bool', default=False),
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route=dict(type='bool', default=False),
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insert=dict(type='int'),
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insert_relative_to=dict(choices=['zero', 'first-ipv4', 'last-ipv4', 'first-ipv6', 'last-ipv6'], default='zero'),
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rule=dict(type='str', choices=['allow', 'deny', 'limit', 'reject']),
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interface=dict(type='str', aliases=['if']),
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interface_in=dict(type='str', aliases=['if_in']),
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interface_out=dict(type='str', aliases=['if_out']),
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log=dict(type='bool', default=False),
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from_ip=dict(type='str', default='any', aliases=['from', 'src']),
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from_port=dict(type='str'),
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to_ip=dict(type='str', default='any', aliases=['dest', 'to']),
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to_port=dict(type='str', aliases=['port']),
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proto=dict(type='str', aliases=['protocol'], choices=['ah', 'any', 'esp', 'ipv6', 'tcp', 'udp', 'gre', 'igmp']),
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name=dict(type='str', aliases=['app']),
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comment=dict(type='str'),
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),
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supports_check_mode=True,
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mutually_exclusive=[
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['name', 'proto', 'logging'],
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# Mutual exclusivity with `interface` implied by `required_by`.
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['direction', 'interface_in'],
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['direction', 'interface_out'],
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],
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required_one_of=([command_keys]),
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required_by=dict(
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interface=('direction', ),
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),
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)
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cmds = []
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ipv4_regexp = compile_ipv4_regexp()
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ipv6_regexp = compile_ipv6_regexp()
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def filter_line_that_not_start_with(pattern, content):
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return ''.join([line for line in content.splitlines(True) if line.startswith(pattern)])
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def filter_line_that_contains(pattern, content):
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return [line for line in content.splitlines(True) if pattern in line]
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def filter_line_that_not_contains(pattern, content):
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return ''.join([line for line in content.splitlines(True) if not line.contains(pattern)])
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def filter_line_that_match_func(match_func, content):
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return ''.join([line for line in content.splitlines(True) if match_func(line) is not None])
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def filter_line_that_contains_ipv4(content):
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return filter_line_that_match_func(ipv4_regexp.search, content)
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def filter_line_that_contains_ipv6(content):
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return filter_line_that_match_func(ipv6_regexp.search, content)
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def is_starting_by_ipv4(ip):
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return ipv4_regexp.match(ip) is not None
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def is_starting_by_ipv6(ip):
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return ipv6_regexp.match(ip) is not None
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def execute(cmd, ignore_error=False):
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cmd = ' '.join(map(itemgetter(-1), filter(itemgetter(0), cmd)))
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cmds.append(cmd)
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(rc, out, err) = module.run_command(cmd, environ_update={"LANG": "C"})
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if rc != 0 and not ignore_error:
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module.fail_json(msg=err or out, commands=cmds)
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return out
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def get_current_rules():
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user_rules_files = ["/lib/ufw/user.rules",
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"/lib/ufw/user6.rules",
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"/etc/ufw/user.rules",
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"/etc/ufw/user6.rules",
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"/var/lib/ufw/user.rules",
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"/var/lib/ufw/user6.rules"]
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cmd = [[grep_bin], ["-h"], ["'^### tuple'"]]
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cmd.extend([[f] for f in user_rules_files])
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return execute(cmd, ignore_error=True)
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def ufw_version():
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"""
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Returns the major and minor version of ufw installed on the system.
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"""
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out = execute([[ufw_bin], ["--version"]])
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lines = [x for x in out.split('\n') if x.strip() != '']
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if len(lines) == 0:
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module.fail_json(msg="Failed to get ufw version.", rc=0, out=out)
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matches = re.search(r'^ufw.+(\d+)\.(\d+)(?:\.(\d+))?.*$', lines[0])
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if matches is None:
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module.fail_json(msg="Failed to get ufw version.", rc=0, out=out)
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# Convert version to numbers
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major = int(matches.group(1))
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minor = int(matches.group(2))
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rev = 0
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if matches.group(3) is not None:
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rev = int(matches.group(3))
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return major, minor, rev
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params = module.params
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commands = dict((key, params[key]) for key in command_keys if params[key])
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# Ensure ufw is available
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ufw_bin = module.get_bin_path('ufw', True)
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grep_bin = module.get_bin_path('grep', True)
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# Save the pre state and rules in order to recognize changes
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pre_state = execute([[ufw_bin], ['status verbose']])
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pre_rules = get_current_rules()
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changed = False
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# Execute filter
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for (command, value) in commands.items():
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cmd = [[ufw_bin], [module.check_mode, '--dry-run']]
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if command == 'state':
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states = {'enabled': 'enable', 'disabled': 'disable',
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'reloaded': 'reload', 'reset': 'reset'}
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if value in ['reloaded', 'reset']:
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changed = True
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if module.check_mode:
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# "active" would also match "inactive", hence the space
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ufw_enabled = pre_state.find(" active") != -1
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if (value == 'disabled' and ufw_enabled) or (value == 'enabled' and not ufw_enabled):
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changed = True
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else:
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execute(cmd + [['-f'], [states[value]]])
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|
|
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:
|
|
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()
|