#!/usr/bin/python
# -*- coding: utf-8 -*-

# (c) 2013, Adam Miller (maxamillion@fedoraproject.org)
#
# 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: firewalld
short_description: Manage arbitrary ports/services with firewalld
description:
  - This module allows for addition or deletion of services and ports either tcp or udp in either running or permanent firewalld rules.
version_added: "1.4"
options:
  service:
    description:
      - "Name of a service to add/remove to/from firewalld - service must be listed in /etc/services."
    required: false
    default: null
  port:
    description:
      - "Name of a port or port range to add/remove to/from firewalld. Must be in the form PORT/PROTOCOL or PORT-PORT/PROTOCOL for port ranges."
    required: false
    default: null
  rich_rule:
    description:
      - "Rich rule to add/remove to/from firewalld."
    required: false
    default: null
  source:
    description:
      - 'The source/network you would like to add/remove to/from firewalld'
    required: false
    default: null
    version_added: "2.0"
  interface:
    description:
      - 'The interface you would like to add/remove to/from a zone in firewalld'
    required: false
    default: null
    version_added: "2.1"
  zone:
    description:
      - 'The firewalld zone to add/remove to/from (NOTE: default zone can be configured per system but "public" is default from upstream. Available choices can be extended based on per-system configs, listed here are "out of the box" defaults).'
    required: false
    default: system-default(public)
    choices: [ "work", "drop", "internal", "external", "trusted", "home", "dmz", "public", "block" ]
  permanent:
    description:
      - "Should this configuration be in the running firewalld configuration or persist across reboots."
    required: false
    default: null
  immediate:
    description:
      - "Should this configuration be applied immediately, if set as permanent"
    required: false
    default: false
    version_added: "1.9"
  state:
    description:
      - "Should this port accept(enabled) or reject(disabled) connections."
    required: true
    choices: [ "enabled", "disabled" ]
  timeout:
    description:
      - "The amount of time the rule should be in effect for when non-permanent."
    required: false
    default: 0
  masquerade:
    description:
      - 'The masquerade setting you would like to enable/disable to/from zones within firewalld'
    required: false
    default: null
    version_added: "2.1"
notes:
  - Not tested on any Debian based system.
  - Requires the python2 bindings of firewalld, who may not be installed by default if the distribution switched to python 3 
requirements: [ 'firewalld >= 0.2.11' ]
author: "Adam Miller (@maxamillion)"
'''

EXAMPLES = '''
- firewalld: service=https permanent=true state=enabled
- firewalld: port=8081/tcp permanent=true state=disabled
- firewalld: port=161-162/udp permanent=true state=enabled
- firewalld: zone=dmz service=http permanent=true state=enabled
- firewalld: rich_rule='rule service name="ftp" audit limit value="1/m" accept' permanent=true state=enabled
- firewalld: source='192.168.1.0/24' zone=internal state=enabled
- firewalld: zone=trusted interface=eth2 permanent=true state=enabled
- firewalld: masquerade=yes state=enabled permanent=true zone=dmz
'''

import os
import re

try:
    import firewall.config
    FW_VERSION = firewall.config.VERSION

    from firewall.client import Rich_Rule
    from firewall.client import FirewallClient
    fw = FirewallClient()
    if not fw.connected:
        HAS_FIREWALLD = False
    else:
        HAS_FIREWALLD = True
except ImportError:
    HAS_FIREWALLD = False


#####################
# masquerade handling
#
def get_masquerade_enabled(zone):
    if fw.queryMasquerade(zone) == True:
        return True
    else:
        return False

def get_masquerade_enabled_permanent(zone):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    if fw_settings.getMasquerade() == True:
        return True
    else:
        return False
    
def set_masquerade_enabled(zone):
    fw.addMasquerade(zone)

def set_masquerade_disabled(zone):
    fw.removeMasquerade(zone)

def set_masquerade_permanent(zone, masquerade):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    fw_settings.setMasquerade(masquerade)
    fw_zone.update(fw_settings)

################
# port handling
#
def get_port_enabled(zone, port_proto):
    if port_proto in fw.getPorts(zone):
        return True
    else:
        return False

def set_port_enabled(zone, port, protocol, timeout):
    fw.addPort(zone, port, protocol, timeout)

def set_port_disabled(zone, port, protocol):
    fw.removePort(zone, port, protocol)

def get_port_enabled_permanent(zone, port_proto):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    if tuple(port_proto) in fw_settings.getPorts():
        return True
    else:
        return False

def set_port_enabled_permanent(zone, port, protocol):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    fw_settings.addPort(port, protocol)
    fw_zone.update(fw_settings)

def set_port_disabled_permanent(zone, port, protocol):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    fw_settings.removePort(port, protocol)
    fw_zone.update(fw_settings)

####################
# source handling
#
def get_source(zone, source):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    if source in fw_settings.getSources():
       return True
    else:
        return False

def add_source(zone, source):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    fw_settings.addSource(source)
    fw_zone.update(fw_settings)

def remove_source(zone, source):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    fw_settings.removeSource(source)
    fw_zone.update(fw_settings)

####################
# interface handling
#
def get_interface(zone, interface):
    if interface in fw.getInterfaces(zone):
        return True
    else:
        return False

def change_zone_of_interface(zone, interface):
    fw.changeZoneOfInterface(zone, interface)

def remove_interface(zone, interface):
    fw.removeInterface(zone, interface)

def get_interface_permanent(zone, interface):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    if interface in fw_settings.getInterfaces():
       return True
    else:
        return False

def change_zone_of_interface_permanent(zone, interface):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    old_zone_name = fw.config().getZoneOfInterface(interface)
    if old_zone_name != zone:
        if old_zone_name:
            old_zone_obj = fw.config().getZoneByName(old_zone_name)
            old_zone_settings = old_zone_obj.getSettings()
            old_zone_settings.removeInterface(interface) # remove from old
            old_zone_obj.update(old_zone_settings)
        fw_settings.addInterface(interface)              # add to new
        fw_zone.update(fw_settings)

def remove_interface_permanent(zone, interface):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    fw_settings.removeInterface(interface)
    fw_zone.update(fw_settings)

####################
# service handling
#
def get_service_enabled(zone, service):
    if service in fw.getServices(zone):
        return True
    else:
        return False

def set_service_enabled(zone, service, timeout):
    fw.addService(zone, service, timeout)

def set_service_disabled(zone, service):
    fw.removeService(zone, service)

def get_service_enabled_permanent(zone, service):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    if service in fw_settings.getServices():
        return True
    else:
        return False

def set_service_enabled_permanent(zone, service):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    fw_settings.addService(service)
    fw_zone.update(fw_settings)

def set_service_disabled_permanent(zone, service):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    fw_settings.removeService(service)
    fw_zone.update(fw_settings)


####################
# rich rule handling
#
def get_rich_rule_enabled(zone, rule):
    # Convert the rule string to standard format
    # before checking whether it is present
    rule = str(Rich_Rule(rule_str=rule))
    if rule in fw.getRichRules(zone):
        return True
    else:
        return False

def set_rich_rule_enabled(zone, rule, timeout):
    fw.addRichRule(zone, rule, timeout)

def set_rich_rule_disabled(zone, rule):
    fw.removeRichRule(zone, rule)

def get_rich_rule_enabled_permanent(zone, rule):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    # Convert the rule string to standard format
    # before checking whether it is present
    rule = str(Rich_Rule(rule_str=rule))
    if rule in fw_settings.getRichRules():
        return True
    else:
        return False

def set_rich_rule_enabled_permanent(zone, rule):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    fw_settings.addRichRule(rule)
    fw_zone.update(fw_settings)

def set_rich_rule_disabled_permanent(zone, rule):
    fw_zone = fw.config().getZoneByName(zone)
    fw_settings = fw_zone.getSettings()
    fw_settings.removeRichRule(rule)
    fw_zone.update(fw_settings)


def main():

    module = AnsibleModule(
        argument_spec = dict(
            service=dict(required=False,default=None),
            port=dict(required=False,default=None),
            rich_rule=dict(required=False,default=None),
            zone=dict(required=False,default=None),
            immediate=dict(type='bool',default=False),
            source=dict(required=False,default=None),
            permanent=dict(type='bool',required=False,default=None),
            state=dict(choices=['enabled', 'disabled'], required=True),
            timeout=dict(type='int',required=False,default=0),
            interface=dict(required=False,default=None),
            masquerade=dict(required=False,default=None),
        ),
        supports_check_mode=True
    )
    if module.params['source'] == None and module.params['permanent'] == None:
        module.fail_json(msg='permanent is a required parameter')

    if module.params['interface'] != None and module.params['zone'] == None:
        module.fail(msg='zone is a required parameter')

    if not HAS_FIREWALLD:
        module.fail_json(msg='firewalld and its python 2 module are required for this module')

    ## Pre-run version checking
    if FW_VERSION < "0.2.11":
        module.fail_json(msg='unsupported version of firewalld, requires >= 2.0.11')

    ## Global Vars
    changed=False
    msgs = []
    service = module.params['service']
    rich_rule = module.params['rich_rule']
    source = module.params['source']

    if module.params['port'] != None:
        port, protocol = module.params['port'].split('/')
        if protocol == None:
            module.fail_json(msg='improper port format (missing protocol?)')
    else:
        port = None

    if module.params['zone'] != None:
        zone = module.params['zone']
    else:
        zone = fw.getDefaultZone()

    permanent = module.params['permanent']
    desired_state = module.params['state']
    immediate = module.params['immediate']
    timeout = module.params['timeout']
    interface = module.params['interface']
    masquerade = module.params['masquerade']

    ## Check for firewalld running
    try:
        if fw.connected == False:
            module.fail_json(msg='firewalld service must be running')
    except AttributeError:
        module.fail_json(msg="firewalld connection can't be established,\
                version likely too old. Requires firewalld >= 2.0.11")

    modification_count = 0
    if service != None:
        modification_count += 1
    if port != None:
        modification_count += 1
    if rich_rule != None:
        modification_count += 1
    if interface != None:
        modification_count += 1
    if masquerade != None:
        modification_count += 1

    if modification_count > 1:
        module.fail_json(msg='can only operate on port, service, rich_rule or interface at once')

    if service != None:
        if permanent:
            is_enabled = get_service_enabled_permanent(zone, service)
            msgs.append('Permanent operation')

            if desired_state == "enabled":
                if is_enabled == False:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_service_enabled_permanent(zone, service)
                    changed=True
            elif desired_state == "disabled":
                if is_enabled == True:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_service_disabled_permanent(zone, service)
                    changed=True
        if immediate or not permanent:
            is_enabled = get_service_enabled(zone, service)
            msgs.append('Non-permanent operation')


            if desired_state == "enabled":
                if is_enabled == False:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_service_enabled(zone, service, timeout)
                    changed=True
            elif desired_state == "disabled":
                if is_enabled == True:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_service_disabled(zone, service)
                    changed=True

        if changed == True:
            msgs.append("Changed service %s to %s" % (service, desired_state))

    if source != None:
        is_enabled = get_source(zone, source)
        if desired_state == "enabled":
            if is_enabled == False:
                if module.check_mode:
                    module.exit_json(changed=True)

                add_source(zone, source)
                changed=True
                msgs.append("Added %s to zone %s" % (source, zone))
        elif desired_state == "disabled":
            if is_enabled == True:
                if module.check_mode:
                    module.exit_json(changed=True)

                remove_source(zone, source)
                changed=True
                msgs.append("Removed %s from zone %s" % (source, zone))

    if port != None:
        if permanent:
            is_enabled = get_port_enabled_permanent(zone, [port, protocol])
            msgs.append('Permanent operation')

            if desired_state == "enabled":
                if is_enabled == False:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_port_enabled_permanent(zone, port, protocol)
                    changed=True
            elif desired_state == "disabled":
                if is_enabled == True:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_port_disabled_permanent(zone, port, protocol)
                    changed=True
        if immediate or not permanent:
            is_enabled = get_port_enabled(zone, [port,protocol])
            msgs.append('Non-permanent operation')

            if desired_state == "enabled":
                if is_enabled == False:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_port_enabled(zone, port, protocol, timeout)
                    changed=True
            elif desired_state == "disabled":
                if is_enabled == True:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_port_disabled(zone, port, protocol)
                    changed=True

        if changed == True:
            msgs.append("Changed port %s to %s" % ("%s/%s" % (port, protocol), \
                        desired_state))

    if rich_rule != None:
        if permanent:
            is_enabled = get_rich_rule_enabled_permanent(zone, rich_rule)
            msgs.append('Permanent operation')

            if desired_state == "enabled":
                if is_enabled == False:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_rich_rule_enabled_permanent(zone, rich_rule)
                    changed=True
            elif desired_state == "disabled":
                if is_enabled == True:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_rich_rule_disabled_permanent(zone, rich_rule)
                    changed=True
        if immediate or not permanent:
            is_enabled = get_rich_rule_enabled(zone, rich_rule)
            msgs.append('Non-permanent operation')

            if desired_state == "enabled":
                if is_enabled == False:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_rich_rule_enabled(zone, rich_rule, timeout)
                    changed=True
            elif desired_state == "disabled":
                if is_enabled == True:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_rich_rule_disabled(zone, rich_rule)
                    changed=True

        if changed == True:
            msgs.append("Changed rich_rule %s to %s" % (rich_rule, desired_state))

    if interface != None:
        if permanent:
            is_enabled = get_interface_permanent(zone, interface)
            msgs.append('Permanent operation')
            if desired_state == "enabled":
                if is_enabled == False:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    change_zone_of_interface_permanent(zone, interface)
                    changed=True
                    msgs.append("Changed %s to zone %s" % (interface, zone))
            elif desired_state == "disabled":
                if is_enabled == True:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    remove_interface_permanent(zone, interface)
                    changed=True
                    msgs.append("Removed %s from zone %s" % (interface, zone))
        if immediate or not permanent:
            is_enabled = get_interface(zone, interface)
            msgs.append('Non-permanent operation')
            if desired_state == "enabled":
                if is_enabled == False:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    change_zone_of_interface(zone, interface)
                    changed=True
                    msgs.append("Changed %s to zone %s" % (interface, zone))
            elif desired_state == "disabled":
                if is_enabled == True:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    remove_interface(zone, interface)
                    changed=True
                    msgs.append("Removed %s from zone %s" % (interface, zone))

    if masquerade != None:

        if permanent:
            is_enabled = get_masquerade_enabled_permanent(zone)
            msgs.append('Permanent operation')
            
            if desired_state == "enabled":
                if is_enabled == False:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_masquerade_permanent(zone, True)
                    changed=True
                    msgs.append("Added masquerade to zone %s" % (zone))
            elif desired_state == "disabled":
                if is_enabled == True:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_masquerade_permanent(zone, False)
                    changed=True
                    msgs.append("Removed masquerade from zone %s" % (zone))
        if immediate or not permanent:
            is_enabled = get_masquerade_enabled(zone)
            msgs.append('Non-permanent operation')
            
            if desired_state == "enabled":
                if is_enabled == False:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_masquerade_enabled(zone)
                    changed=True
                    msgs.append("Added masquerade to zone %s" % (zone))
            elif desired_state == "disabled":
                if is_enabled == True:
                    if module.check_mode:
                        module.exit_json(changed=True)

                    set_masquerade_disabled(zone)
                    changed=True
                    msgs.append("Removed masquerade from zone %s" % (zone))

    module.exit_json(changed=changed, msg=', '.join(msgs))


#################################################
# import module snippets
from ansible.module_utils.basic import *
main()