diff options
Diffstat (limited to 'src')
| -rwxr-xr-x | src/conf_mode/conntrack.py | 139 | ||||
| -rwxr-xr-x | src/migration-scripts/conntrack/2-to-3 | 37 |
2 files changed, 176 insertions, 0 deletions
diff --git a/src/conf_mode/conntrack.py b/src/conf_mode/conntrack.py new file mode 100755 index 000000000..68877f794 --- /dev/null +++ b/src/conf_mode/conntrack.py @@ -0,0 +1,139 @@ +#!/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/>. + +import os + +from sys import exit + +from vyos.config import Config +from vyos.configdict import dict_merge +from vyos.util import cmd +from vyos.util import run +from vyos.util import process_named_running +from vyos.util import dict_search +from vyos.template import render +from vyos.xml import defaults +from vyos import ConfigError +from vyos import airbag +airbag.enable() + +conntrack_config = r'/etc/modprobe.d/vyatta_nf_conntrack.conf' +sysctl_file = r'/run/sysctl/10-vyos-conntrack.conf' + +# Every ALG (Application Layer Gateway) consists of either a Kernel Object +# also called a Kernel Module/Driver or some rules present in iptables +module_map = { + 'ftp' : { + 'ko' : ['nf_nat_ftp', 'nf_conntrack_ftp'], + }, + 'h323' : { + 'ko' : ['nf_nat_h323', 'nf_conntrack_h323'], + }, + 'nfs' : { + 'iptables' : ['VYATTA_CT_HELPER --table raw --proto tcp --dport 111 --jump CT --helper rpc', + 'VYATTA_CT_HELPER --table raw --proto udp --dport 111 --jump CT --helper rpc'], + }, + 'pptp' : { + 'ko' : ['nf_nat_pptp', 'nf_conntrack_pptp'], + }, + 'sip' : { + 'ko' : ['nf_nat_sip', 'nf_conntrack_sip'], + }, + 'sqlnet' : { + 'iptables' : ['VYATTA_CT_HELPER --table raw --proto tcp --dport 1521 --jump CT --helper tns', + 'VYATTA_CT_HELPER --table raw --proto tcp --dport 1525 --jump CT --helper tns', + 'VYATTA_CT_HELPER --table raw --proto tcp --dport 1536 --jump CT --helper tns'], + }, + 'tftp' : { + 'ko' : ['nf_nat_tftp', 'nf_conntrack_tftp'], + }, +} + +def resync_conntrackd(): + tmp = run('/usr/libexec/vyos/conf_mode/conntrack_sync.py') + if tmp > 0: + print('ERROR: error restarting conntrackd!') + +def get_config(config=None): + if config: + conf = config + else: + conf = Config() + base = ['system', 'conntrack'] + + conntrack = conf.get_config_dict(base, key_mangling=('-', '_'), + get_first_key=True) + + # We have gathered the dict representation of the CLI, but there are default + # options which we need to update into the dictionary retrived. + default_values = defaults(base) + conntrack = dict_merge(default_values, conntrack) + + return conntrack + +def verify(conntrack): + return None + +def generate(conntrack): + render(conntrack_config, 'conntrack/vyos_nf_conntrack.conf.tmpl', conntrack) + render(sysctl_file, 'conntrack/sysctl.conf.tmpl', conntrack) + + return None + +def apply(conntrack): + # Depending on the enable/disable state of the ALG (Application Layer Gateway) + # modules we need to either insmod or rmmod the helpers. + for module, module_config in module_map.items(): + if dict_search(f'modules.{module}', conntrack) is None: + if 'ko' in module_config: + for mod in module_config['ko']: + # Only remove the module if it's loaded + if os.path.exists(f'/sys/module/{mod}'): + cmd(f'rmmod {mod}') + if 'iptables' in module_config: + for rule in module_config['iptables']: + # Only install iptables rule if it does not exist + tmp = run(f'iptables --check {rule}') + if tmp == 0: cmd(f'iptables --delete {rule}') + else: + if 'ko' in module_config: + for mod in module_config['ko']: + cmd(f'modprobe {mod}') + if 'iptables' in module_config: + for rule in module_config['iptables']: + # Only install iptables rule if it does not exist + tmp = run(f'iptables --check {rule}') + if tmp > 0: cmd(f'iptables --insert {rule}') + + if process_named_running('conntrackd'): + # Reload conntrack-sync daemon to fetch new sysctl values + resync_conntrackd() + + # We silently ignore all errors + # See: https://bugzilla.redhat.com/show_bug.cgi?id=1264080 + cmd(f'sysctl -f {sysctl_file}') + + return None + +if __name__ == '__main__': + try: + c = get_config() + verify(c) + generate(c) + apply(c) + except ConfigError as e: + print(e) + exit(1) diff --git a/src/migration-scripts/conntrack/2-to-3 b/src/migration-scripts/conntrack/2-to-3 new file mode 100755 index 000000000..8a8b43279 --- /dev/null +++ b/src/migration-scripts/conntrack/2-to-3 @@ -0,0 +1,37 @@ +#!/usr/bin/env python3 + +# Conntrack syntax version 3 +# Enables all conntrack modules (previous default behaviour) and omits manually disabled modules. + +import sys + +from vyos.configtree import ConfigTree +from vyos.version import get_version + +if len(sys.argv) < 1: + print('Must specify file name!') + sys.exit(1) + +filename = sys.argv[1] + +with open(filename, 'r') as f: + config = ConfigTree(f.read()) + +module_path = ['system', 'conntrack', 'modules'] + +# Go over all conntrack modules available as of v1.3.0. +for module in ['ftp', 'h323', 'nfs', 'pptp', 'sip', 'sqlnet', 'tftp']: + # 'disable' is being phased out. + if config.exists(module_path + [module, 'disable']): + config.delete(module_path + [module]) + # If it wasn't manually 'disable'd, it was enabled by default. + else: + config.set(module_path + [module]) + +try: + if config.exists(module_path): + with open(filename, 'w') as f: + f.write(config.to_string()) +except OSError as e: + print(f'Failed to save the modified config: {e}') + sys.exit(1) |