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ipsec.py
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ipsec.py
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#!/usr/bin/env python3
#
# Copyright (C) 2022 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
from collections import OrderedDict
from hurry import filesize
from re import split as re_split
from tabulate import tabulate
from subprocess import TimeoutExpired
from vyos.util import call
from vyos.util import convert_data
from vyos.util import seconds_to_human
import vyos.opmode
SWANCTL_CONF = '/etc/swanctl/swanctl.conf'
def _convert(text):
return int(text) if text.isdigit() else text.lower()
def _alphanum_key(key):
return [_convert(c) for c in re_split('([0-9]+)', str(key))]
def _get_vici_sas():
from vici import Session as vici_session
try:
session = vici_session()
except Exception:
raise vyos.opmode.UnconfiguredSubsystem("IPsec not initialized")
sas = list(session.list_sas())
return sas
def _get_raw_data_sas():
get_sas = _get_vici_sas()
sas = convert_data(get_sas)
return sas
def _get_formatted_output_sas(sas):
sa_data = []
for sa in sas:
for parent_sa in sa.values():
# create an item for each child-sa
for child_sa in parent_sa.get('child-sas', {}).values():
# prepare a list for output data
sa_out_name = sa_out_state = sa_out_uptime = sa_out_bytes = sa_out_packets = sa_out_remote_addr = sa_out_remote_id = sa_out_proposal = 'N/A'
# collect raw data
sa_name = child_sa.get('name')
sa_state = child_sa.get('state')
sa_uptime = child_sa.get('install-time')
sa_bytes_in = child_sa.get('bytes-in')
sa_bytes_out = child_sa.get('bytes-out')
sa_packets_in = child_sa.get('packets-in')
sa_packets_out = child_sa.get('packets-out')
sa_remote_addr = parent_sa.get('remote-host')
sa_remote_id = parent_sa.get('remote-id')
sa_proposal_encr_alg = child_sa.get('encr-alg')
sa_proposal_integ_alg = child_sa.get('integ-alg')
sa_proposal_encr_keysize = child_sa.get('encr-keysize')
sa_proposal_dh_group = child_sa.get('dh-group')
# format data to display
if sa_name:
sa_out_name = sa_name
if sa_state:
if sa_state == 'INSTALLED':
sa_out_state = 'up'
else:
sa_out_state = 'down'
if sa_uptime:
sa_out_uptime = seconds_to_human(sa_uptime)
if sa_bytes_in and sa_bytes_out:
bytes_in = filesize.size(int(sa_bytes_in))
bytes_out = filesize.size(int(sa_bytes_out))
sa_out_bytes = f'{bytes_in}/{bytes_out}'
if sa_packets_in and sa_packets_out:
packets_in = filesize.size(int(sa_packets_in),
system=filesize.si)
packets_out = filesize.size(int(sa_packets_out),
system=filesize.si)
packets_str = f'{packets_in}/{packets_out}'
sa_out_packets = re.sub(r'B', r'', packets_str)
if sa_remote_addr:
sa_out_remote_addr = sa_remote_addr
if sa_remote_id:
sa_out_remote_id = sa_remote_id
# format proposal
if sa_proposal_encr_alg:
sa_out_proposal = sa_proposal_encr_alg
if sa_proposal_encr_keysize:
sa_proposal_encr_keysize_str = sa_proposal_encr_keysize
sa_out_proposal = f'{sa_out_proposal}_{sa_proposal_encr_keysize_str}'
if sa_proposal_integ_alg:
sa_proposal_integ_alg_str = sa_proposal_integ_alg
sa_out_proposal = f'{sa_out_proposal}/{sa_proposal_integ_alg_str}'
if sa_proposal_dh_group:
sa_proposal_dh_group_str = sa_proposal_dh_group
sa_out_proposal = f'{sa_out_proposal}/{sa_proposal_dh_group_str}'
# add a new item to output data
sa_data.append([
sa_out_name, sa_out_state, sa_out_uptime, sa_out_bytes,
sa_out_packets, sa_out_remote_addr, sa_out_remote_id,
sa_out_proposal
])
headers = [
"Connection", "State", "Uptime", "Bytes In/Out", "Packets In/Out",
"Remote address", "Remote ID", "Proposal"
]
sa_data = sorted(sa_data, key=_alphanum_key)
output = tabulate(sa_data, headers)
return output
# Connections block
def _get_vici_connections():
from vici import Session as vici_session
try:
session = vici_session()
except Exception:
raise vyos.opmode.UnconfiguredSubsystem("IPsec not initialized")
connections = list(session.list_conns())
return connections
def _get_convert_data_connections():
get_connections = _get_vici_connections()
connections = convert_data(get_connections)
return connections
def _get_parent_sa_proposal(connection_name: str, data: list) -> dict:
"""Get parent SA proposals by connection name
if connections not in the 'down' state
Args:
connection_name (str): Connection name
data (list): List of current SAs from vici
Returns:
str: Parent SA connection proposal
AES_CBC/256/HMAC_SHA2_256_128/MODP_1024
"""
if not data:
return {}
for sa in data:
# check if parent SA exist
if connection_name not in sa.keys():
return {}
if 'encr-alg' in sa[connection_name]:
encr_alg = sa.get(connection_name, '').get('encr-alg')
cipher = encr_alg.split('_')[0]
mode = encr_alg.split('_')[1]
encr_keysize = sa.get(connection_name, '').get('encr-keysize')
integ_alg = sa.get(connection_name, '').get('integ-alg')
# prf_alg = sa.get(connection_name, '').get('prf-alg')
dh_group = sa.get(connection_name, '').get('dh-group')
proposal = {
'cipher': cipher,
'mode': mode,
'key_size': encr_keysize,
'hash': integ_alg,
'dh': dh_group
}
return proposal
return {}
def _get_parent_sa_state(connection_name: str, data: list) -> str:
"""Get parent SA state by connection name
Args:
connection_name (str): Connection name
data (list): List of current SAs from vici
Returns:
Parent SA connection state
"""
if not data:
return 'down'
for sa in data:
# check if parent SA exist
if connection_name not in sa.keys():
return 'down'
if sa[connection_name]['state'].lower() == 'established':
return 'up'
else:
return 'down'
def _get_child_sa_state(connection_name: str, tunnel_name: str,
data: list) -> str:
"""Get child SA state by connection and tunnel name
Args:
connection_name (str): Connection name
tunnel_name (str): Tunnel name
data (list): List of current SAs from vici
Returns:
str: `up` if child SA state is 'installed' otherwise `down`
"""
if not data:
return 'down'
for sa in data:
# check if parent SA exist
if connection_name not in sa.keys():
return 'down'
child_sas = sa[connection_name]['child-sas']
# Get all child SA states
# there can be multiple SAs per tunnel
child_sa_states = [
v['state'] for k, v in child_sas.items() if v['name'] == tunnel_name
]
return 'up' if 'INSTALLED' in child_sa_states else 'down'
def _get_child_sa_info(connection_name: str, tunnel_name: str,
data: list) -> dict:
"""Get child SA installed info by connection and tunnel name
Args:
connection_name (str): Connection name
tunnel_name (str): Tunnel name
data (list): List of current SAs from vici
Returns:
dict: Info of the child SA in the dictionary format
"""
for sa in data:
# check if parent SA exist
if connection_name not in sa.keys():
return {}
child_sas = sa[connection_name]['child-sas']
# Get all child SA data
# Skip temp SA name (first key), get only SA values as dict
# {'OFFICE-B-tunnel-0-46': {'name': 'OFFICE-B-tunnel-0'}...}
# i.e get all data after 'OFFICE-B-tunnel-0-46'
child_sa_info = [
v for k, v in child_sas.items() if 'name' in v and
v['name'] == tunnel_name and v['state'] == 'INSTALLED'
]
return child_sa_info[-1] if child_sa_info else {}
def _get_child_sa_proposal(child_sa_data: dict) -> dict:
if child_sa_data and 'encr-alg' in child_sa_data:
encr_alg = child_sa_data.get('encr-alg')
cipher = encr_alg.split('_')[0]
mode = encr_alg.split('_')[1]
key_size = child_sa_data.get('encr-keysize')
integ_alg = child_sa_data.get('integ-alg')
dh_group = child_sa_data.get('dh-group')
proposal = {
'cipher': cipher,
'mode': mode,
'key_size': key_size,
'hash': integ_alg,
'dh': dh_group
}
return proposal
return {}
def _get_raw_data_connections(list_connections: list, list_sas: list) -> list:
"""Get configured VPN IKE connections and IPsec states
Args:
list_connections (list): List of configured connections from vici
list_sas (list): List of current SAs from vici
Returns:
list: List and status of IKE/IPsec connections/tunnels
"""
base_dict = []
for connections in list_connections:
base_list = {}
for connection, conn_conf in connections.items():
base_list['ike_connection_name'] = connection
base_list['ike_connection_state'] = _get_parent_sa_state(
connection, list_sas)
base_list['ike_remote_address'] = conn_conf['remote_addrs']
base_list['ike_proposal'] = _get_parent_sa_proposal(
connection, list_sas)
base_list['local_id'] = conn_conf.get('local-1', '').get('id')
base_list['remote_id'] = conn_conf.get('remote-1', '').get('id')
base_list['version'] = conn_conf.get('version', 'IKE')
base_list['children'] = []
children = conn_conf['children']
for tunnel, tun_options in children.items():
state = _get_child_sa_state(connection, tunnel, list_sas)
local_ts = tun_options.get('local-ts')
remote_ts = tun_options.get('remote-ts')
dpd_action = tun_options.get('dpd_action')
close_action = tun_options.get('close_action')
sa_info = _get_child_sa_info(connection, tunnel, list_sas)
esp_proposal = _get_child_sa_proposal(sa_info)
base_list['children'].append({
'name': tunnel,
'state': state,
'local_ts': local_ts,
'remote_ts': remote_ts,
'dpd_action': dpd_action,
'close_action': close_action,
'sa': sa_info,
'esp_proposal': esp_proposal
})
base_dict.append(base_list)
return base_dict
def _get_raw_connections_summary(list_conn, list_sas):
import jmespath
data = _get_raw_data_connections(list_conn, list_sas)
match = '[*].children[]'
child = jmespath.search(match, data)
tunnels_down = len([k for k in child if k['state'] == 'down'])
tunnels_up = len([k for k in child if k['state'] == 'up'])
tun_dict = {
'tunnels': child,
'total': len(child),
'down': tunnels_down,
'up': tunnels_up
}
return tun_dict
def _get_formatted_output_conections(data):
from tabulate import tabulate
data_entries = ''
connections = []
for entry in data:
tunnels = []
ike_name = entry['ike_connection_name']
ike_state = entry['ike_connection_state']
conn_type = entry.get('version', 'IKE')
remote_addrs = ','.join(entry['ike_remote_address'])
local_ts, remote_ts = '-', '-'
local_id = entry['local_id']
remote_id = entry['remote_id']
proposal = '-'
if entry.get('ike_proposal'):
proposal = (f'{entry["ike_proposal"]["cipher"]}_'
f'{entry["ike_proposal"]["mode"]}/'
f'{entry["ike_proposal"]["key_size"]}/'
f'{entry["ike_proposal"]["hash"]}/'
f'{entry["ike_proposal"]["dh"]}')
connections.append([
ike_name, ike_state, conn_type, remote_addrs, local_ts, remote_ts,
local_id, remote_id, proposal
])
for tun in entry['children']:
tun_name = tun.get('name')
tun_state = tun.get('state')
conn_type = 'IPsec'
local_ts = '\n'.join(tun.get('local_ts'))
remote_ts = '\n'.join(tun.get('remote_ts'))
proposal = '-'
if tun.get('esp_proposal'):
proposal = (f'{tun["esp_proposal"]["cipher"]}_'
f'{tun["esp_proposal"]["mode"]}/'
f'{tun["esp_proposal"]["key_size"]}/'
f'{tun["esp_proposal"]["hash"]}/'
f'{tun["esp_proposal"]["dh"]}')
connections.append([
tun_name, tun_state, conn_type, remote_addrs, local_ts,
remote_ts, local_id, remote_id, proposal
])
connection_headers = [
'Connection', 'State', 'Type', 'Remote address', 'Local TS',
'Remote TS', 'Local id', 'Remote id', 'Proposal'
]
output = tabulate(connections, connection_headers, numalign='left')
return output
# Connections block end
def get_peer_connections(peer, tunnel, return_all = False):
search = rf'^[\s]*({peer}-(tunnel-[\d]+|vti)).*'
matches = []
if not os.path.exists(SWANCTL_CONF):
raise vyos.opmode.UnconfiguredSubsystem("IPsec not initialized")
with open(SWANCTL_CONF, 'r') as f:
for line in f.readlines():
result = re.match(search, line)
if result:
suffix = f'tunnel-{tunnel}' if tunnel.isnumeric() else tunnel
if return_all or (result[2] == suffix):
matches.append(result[1])
return matches
def reset_peer(peer: str, tunnel:str):
conns = get_peer_connections(peer, tunnel, return_all = (not tunnel or tunnel == 'all'))
if not conns:
raise vyos.opmode.IncorrectValue('Peer or tunnel(s) not found, aborting')
for conn in conns:
try:
call(f'sudo /usr/sbin/ipsec down {conn}{{*}}', timeout = 10)
call(f'sudo /usr/sbin/ipsec up {conn}', timeout = 10)
except TimeoutExpired as e:
raise vyos.opmode.InternalError(f'Timed out while resetting {conn}')
print('Peer reset result: success')
def show_sa(raw: bool):
sa_data = _get_raw_data_sas()
if raw:
return sa_data
return _get_formatted_output_sas(sa_data)
def show_connections(raw: bool):
list_conns = _get_convert_data_connections()
list_sas = _get_raw_data_sas()
if raw:
return _get_raw_data_connections(list_conns, list_sas)
connections = _get_raw_data_connections(list_conns, list_sas)
return _get_formatted_output_conections(connections)
def show_connections_summary(raw: bool):
list_conns = _get_convert_data_connections()
list_sas = _get_raw_data_sas()
if raw:
return _get_raw_connections_summary(list_conns, list_sas)
if __name__ == '__main__':
try:
res = vyos.opmode.run(sys.modules[__name__])
if res:
print(res)
except (ValueError, vyos.opmode.Error) as e:
print(e)
sys.exit(1)

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