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#!/usr/bin/env python3
#
# Copyright (C) 2021 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
# T2199: Remove unavailable nodes due to XML/Python implementation using nftables
# monthdays: nftables does not have a monthdays equivalent
# utc: nftables userspace uses localtime and calculates the UTC offset automatically
# icmp/v6: migrate previously available `type-name` to valid type/code
# T4178: Update tcp flags to use multi value node
import re
from sys import argv
from sys import exit
from vyos.configtree import ConfigTree
from vyos.ifconfig import Section
if (len(argv) < 1):
print("Must specify file name!")
exit(1)
file_name = argv[1]
with open(file_name, 'r') as f:
config_file = f.read()
base = ['firewall']
config = ConfigTree(config_file)
if not config.exists(base):
# Nothing to do
exit(0)
icmp_remove = ['any']
icmp_translations = {
'ping': 'echo-request',
'pong': 'echo-reply',
'ttl-exceeded': 'time-exceeded',
# Network Unreachable
'network-unreachable': [3, 0],
'host-unreachable': [3, 1],
'protocol-unreachable': [3, 2],
'port-unreachable': [3, 3],
'fragmentation-needed': [3, 4],
'source-route-failed': [3, 5],
'network-unknown': [3, 6],
'host-unknown': [3, 7],
'network-prohibited': [3, 9],
'host-prohibited': [3, 10],
'TOS-network-unreachable': [3, 11],
'TOS-host-unreachable': [3, 12],
'communication-prohibited': [3, 13],
'host-precedence-violation': [3, 14],
'precedence-cutoff': [3, 15],
# Redirect
'network-redirect': [5, 0],
'host-redirect': [5, 1],
'TOS-network-redirect': [5, 2],
'TOS host-redirect': [5, 3],
# Time Exceeded
'ttl-zero-during-transit': [11, 0],
'ttl-zero-during-reassembly': [11, 1],
# Parameter Problem
'ip-header-bad': [12, 0],
'required-option-missing': [12, 1]
}
icmpv6_remove = []
icmpv6_translations = {
'ping': 'echo-request',
'pong': 'echo-reply',
# Destination Unreachable
'no-route': [1, 0],
'communication-prohibited': [1, 1],
'address-unreachble': [1, 3],
'port-unreachable': [1, 4],
# Redirect
'redirect': 'nd-redirect',
# Time Exceeded
'ttl-zero-during-transit': [3, 0],
'ttl-zero-during-reassembly': [3, 1],
# Parameter Problem
'bad-header': [4, 0],
'unknown-header-type': [4, 1],
'unknown-option': [4, 2]
}
if config.exists(base + ['name']):
for name in config.list_nodes(base + ['name']):
if not config.exists(base + ['name', name, 'rule']):
continue
for rule in config.list_nodes(base + ['name', name, 'rule']):
rule_time = base + ['name', name, 'rule', rule, 'time']
rule_tcp_flags = base + ['name', name, 'rule', rule, 'tcp', 'flags']
rule_icmp = base + ['name', name, 'rule', rule, 'icmp']
if config.exists(rule_time + ['monthdays']):
config.delete(rule_time + ['monthdays'])
if config.exists(rule_time + ['utc']):
config.delete(rule_time + ['utc'])
if config.exists(rule_tcp_flags):
tmp = config.return_value(rule_tcp_flags)
config.delete(rule_tcp_flags)
for flag in tmp.split(","):
if flag[0] == '!':
config.set(rule_tcp_flags + ['not', flag[1:].lower()])
else:
config.set(rule_tcp_flags + [flag.lower()])
if config.exists(rule_icmp + ['type-name']):
tmp = config.return_value(rule_icmp + ['type-name'])
if tmp in icmp_remove:
config.delete(rule_icmp + ['type-name'])
elif tmp in icmp_translations:
translate = icmp_translations[tmp]
if isinstance(translate, str):
config.set(rule_icmp + ['type-name'], value=translate)
elif isinstance(translate, list):
config.delete(rule_icmp + ['type-name'])
config.set(rule_icmp + ['type'], value=translate[0])
config.set(rule_icmp + ['code'], value=translate[1])
for src_dst in ['destination', 'source']:
pg_base = base + ['name', name, 'rule', rule, src_dst, 'group', 'port-group']
proto_base = base + ['name', name, 'rule', rule, 'protocol']
if config.exists(pg_base) and not config.exists(proto_base):
config.set(proto_base, value='tcp_udp')
if config.exists(base + ['ipv6-name']):
for name in config.list_nodes(base + ['ipv6-name']):
if not config.exists(base + ['ipv6-name', name, 'rule']):
continue
for rule in config.list_nodes(base + ['ipv6-name', name, 'rule']):
rule_time = base + ['ipv6-name', name, 'rule', rule, 'time']
rule_tcp_flags = base + ['ipv6-name', name, 'rule', rule, 'tcp', 'flags']
rule_icmp = base + ['ipv6-name', name, 'rule', rule, 'icmpv6']
if config.exists(rule_time + ['monthdays']):
config.delete(rule_time + ['monthdays'])
if config.exists(rule_time + ['utc']):
config.delete(rule_time + ['utc'])
if config.exists(rule_tcp_flags):
tmp = config.return_value(rule_tcp_flags)
config.delete(rule_tcp_flags)
for flag in tmp.split(","):
if flag[0] == '!':
config.set(rule_tcp_flags + ['not', flag[1:].lower()])
else:
config.set(rule_tcp_flags + [flag.lower()])
if config.exists(base + ['ipv6-name', name, 'rule', rule, 'protocol']):
tmp = config.return_value(base + ['ipv6-name', name, 'rule', rule, 'protocol'])
if tmp == 'icmpv6':
config.set(base + ['ipv6-name', name, 'rule', rule, 'protocol'], value='ipv6-icmp')
if config.exists(rule_icmp + ['type']):
tmp = config.return_value(rule_icmp + ['type'])
type_code_match = re.match(r'^(\d+)/(\d+)$', tmp)
if type_code_match:
config.set(rule_icmp + ['type'], value=type_code_match[1])
config.set(rule_icmp + ['code'], value=type_code_match[2])
elif tmp in icmpv6_remove:
config.delete(rule_icmp + ['type'])
elif tmp in icmpv6_translations:
translate = icmpv6_translations[tmp]
if isinstance(translate, str):
config.delete(rule_icmp + ['type'])
config.set(rule_icmp + ['type-name'], value=translate)
elif isinstance(translate, list):
config.set(rule_icmp + ['type'], value=translate[0])
config.set(rule_icmp + ['code'], value=translate[1])
else:
config.rename(rule_icmp + ['type'], 'type-name')
for src_dst in ['destination', 'source']:
pg_base = base + ['ipv6-name', name, 'rule', rule, src_dst, 'group', 'port-group']
proto_base = base + ['ipv6-name', name, 'rule', rule, 'protocol']
if config.exists(pg_base) and not config.exists(proto_base):
config.set(proto_base, value='tcp_udp')
try:
with open(file_name, 'w') as f:
f.write(config.to_string())
except OSError as e:
print("Failed to save the modified config: {}".format(e))
exit(1)

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