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#!/usr/bin/env python3
#
# Copyright (C) 2019 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
import re
import sys
import subprocess
import argparse
import syslog
import time
import vici
import vyos.config
config_file = "/etc/ipsec.conf";
secrets_file = "/etc/ipsec.secrets";
def parse_cli_args():
parser = argparse.ArgumentParser()
parser.add_argument("--interface", type=str)
parser.add_argument("--new_ip", type=str)
parser.add_argument("--old_ip", type=str)
parser.add_argument("--reason", type=str)
args = parser.parse_args()
return args
def ipsec_conf_r():
header = ''
footer = ''
finheader = 0
connlist = list()
conndict = dict()
curconn = ''
with open(config_file) as f:
for line in f:
if re.search('^\s*$', line) and finheader:
continue
if re.search('\#conn.*', line):
curconn = ''
continue
if re.search('(peer-.*-tunnel.*)', line):
finheader = 1
connid = re.search(r'(peer-.*-tunnel.*)', line).group(1)
curconn = connid
if connid not in connlist:
conndict[connid] = dict()
conndict[connid]['_dhcp_iface'] = None
conndict[connid]['_lip'] = None
conndict[connid]['_lines'] = list()
elif re.search('dhcp-interface=(.*)', line) and curconn != '':
conndict[connid]['_dhcp_iface'] = re.search(r'dhcp-interface=(.*)', line).group(1)
elif re.search('left=(.*)', line) and curconn != '':
conndict[connid]['_lip'] = re.search(r'left=(.*)', line).group(1)
elif not finheader:
header = header + line
elif curconn != '':
conndict[connid]['_lines'].append(line)
elif curconn == '':
footer = footer + line;
connlist.append(conndict)
return connlist, header, footer
def ipsec_conf_w(connlist, header, footer, interface, new_ip):
try:
with open(config_file, 'w') as f:
f.write('{0}\n'.format(header))
for connid in connlist:
connname = next(iter(connid))
f.write('conn {0}\n'.format(connname))
if connid[connname]['_dhcp_iface']:
if connid[connname]['_dhcp_iface'] == interface:
if not new_ip:
new_ip = ''
connid[connname]['_lip'] = new_ip
f.write('\t#dhcp-interface={0}\n'.format(connid[connname]['_dhcp_iface']))
f.write('\tleft={0}\n'.format(connid[connname]['_lip']))
for line in connid[connname]['_lines']:
f.write('{0}'.format(line))
f.write('#conn {0}\n\n'.format(connname))
f.write('{0}\n'.format(footer))
except EnvironmentError as e:
sys.exit('Can\'t open {0}: {1}'.format(config_file, e))
def ipsec_sec_r():
lines = []
with open(secrets_file) as f:
lines = [line for line in f]
return lines
def ipsec_sec_w(lines, interface, new_ip):
try:
with open(secrets_file, 'w') as f:
for line in lines:
if re.search('(.*)\#dhcp-interface=(.*)\#', line) and \
re.search('(.*)\#dhcp-interface=(.*)\#', line).group(2) == interface:
secretline = re.search('(.*)\#dhcp-interface=(.*)\#', line).group(1)
if not new_ip:
new_ip = "#"
secline = re.search('(.*?) (.*?) : PSK (.*?) #dhcp', line)
line = '{0} {1} : PSK {2} #dhcp-interface={3}#\n'.format(new_ip,
secline.group(2), secline.group(3), interface)
f.write('{0}'.format(line))
except EnvironmentError as e:
sys.exit('Can\'t open {0}: {1}'.format(config_file, e))
def conn_list():
v = vici.Session()
config = vyos.config.Config()
config_conns = config.list_effective_nodes("vpn ipsec site-to-site peer")
connup = []
v = vici.Session()
for conn in v.list_sas():
for key in conn:
for c_conn in config_conns:
if c_conn in key:
if config.return_effective_value("vpn ipsec site-to-site peer {0} dhcp-interface".format(c_conn)):
connup.append(key)
return connup
def run(*popenargs, input=None, check=False, **kwargs):
if input is not None:
if 'stdin' in kwargs:
raise ValueError('stdin and input arguments may not both be used.')
kwargs['stdin'] = subprocess.PIPE
process = subprocess.Popen(*popenargs, **kwargs)
try:
stdout, stderr = process.communicate(input)
except:
process.kill()
process.wait()
raise
retcode = process.poll()
if check and retcode:
raise subprocess.CalledProcessError(
retcode, process.args, output=stdout, stderr=stderr)
return retcode, stdout, stderr
def term_conn(active_conn):
v = vici.Session()
for conn in active_conn:
try:
list(v.terminate({"ike": conn, "force": "true"}))
except:
pass
def reload_conn():
run(["/usr/sbin/ipsec", "rereadall"], stderr=subprocess.DEVNULL,
stdout=subprocess.DEVNULL)
run(["/usr/sbin/ipsec", "update"], stderr=subprocess.DEVNULL,
stdout=subprocess.DEVNULL)
def init_conn(active_conn, updated_conn):
v = vici.Session()
for conn in active_conn:
if conn not in updated_conn:
list(v.initiate({"child": conn, "timeout": "10000"}))
def main():
args = parse_cli_args()
syslog.openlog('ipsec-dhclient-hook')
syslog.syslog(syslog.LOG_NOTICE, 'Receive DHCP address updated to {0} from {1}'
', reason: {2}.'.format(args.new_ip, args.old_ip, args.reason))
if args.old_ip == args.new_ip and args.reason != 'BOUND' or args.reason == 'REBOOT' or args.reason == 'EXPIRE':
syslog.syslog(syslog.LOG_NOTICE, 'No ipsec update needed.')
sys.exit(0)
syslog.syslog(syslog.LOG_NOTICE, 'DHCP address updated to {0} from {1}: '
' Updating ipsec configuration, reason: {2}.'.format(args.new_ip, args.old_ip, args.reason))
connlist, header, footer = ipsec_conf_r()
ipsec_conf_w(connlist, header, footer, args.interface, args.new_ip)
lines = ipsec_sec_r()
ipsec_sec_w(lines, args.interface, args.new_ip)
if args.new_ip:
active_conn = conn_list()
term_conn(active_conn)
reload_conn()
time.sleep(5)
updated_conn = conn_list()
init_conn(active_conn, updated_conn)
if __name__ == '__main__':
main()
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