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ipsec.py
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ipsec.py
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# Copyright 2020-2023 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#Package to communicate with Strongswan VICI
class ViciInitiateError(Exception):
"""
VICI can't initiate a session.
"""
pass
class ViciCommandError(Exception):
"""
VICI can't execute a command by any reason.
"""
pass
def get_vici_sas():
from vici import Session as vici_session
try:
session = vici_session()
except Exception:
raise ViciInitiateError("IPsec not initialized")
try:
sas = list(session.list_sas())
return sas
except Exception:
raise ViciCommandError(f'Failed to get SAs')
def get_vici_connections():
from vici import Session as vici_session
try:
session = vici_session()
except Exception:
raise ViciInitiateError("IPsec not initialized")
try:
connections = list(session.list_conns())
return connections
except Exception:
raise ViciCommandError(f'Failed to get connections')
def get_vici_sas_by_name(ike_name: str, tunnel: str) -> list:
"""
Find sas by IKE_SA name and/or CHILD_SA name
and return list of OrdinaryDicts with SASs info
If tunnel is not None return value is list of OrdenaryDicts contained only
CHILD_SAs wich names equal tunnel value.
:param ike_name: IKE SA name
:type ike_name: str
:param tunnel: CHILD SA name
:type tunnel: str
:return: list of Ordinary Dicts with SASs
:rtype: list
"""
from vici import Session as vici_session
try:
session = vici_session()
except Exception:
raise ViciInitiateError("IPsec not initialized")
vici_dict = {}
if ike_name:
vici_dict['ike'] = ike_name
if tunnel:
vici_dict['child'] = tunnel
try:
sas = list(session.list_sas(vici_dict))
return sas
except Exception:
raise ViciCommandError(f'Failed to get SAs')
def terminate_vici_ikeid_list(ike_id_list: list) -> None:
"""
Terminate IKE SAs by their id that contained in the list
:param ike_id_list: list of IKE SA id
:type ike_id_list: list
"""
from vici import Session as vici_session
try:
session = vici_session()
except Exception:
raise ViciInitiateError("IPsec not initialized")
try:
for ikeid in ike_id_list:
session_generator = session.terminate(
{'ike-id': ikeid, 'timeout': '-1'})
# a dummy `for` loop is required because of requirements
# from vici. Without a full iteration on the output, the
# command to vici may not be executed completely
for _ in session_generator:
pass
except Exception:
raise ViciCommandError(
f'Failed to terminate SA for IKE ids {ike_id_list}')
def terminate_vici_by_name(ike_name: str, child_name: str) -> None:
"""
Terminate IKE SAs by name if CHILD SA name is None.
Terminate CHILD SAs by name if CHILD SA name is specified
:param ike_name: IKE SA name
:type ike_name: str
:param child_name: CHILD SA name
:type child_name: str
"""
from vici import Session as vici_session
try:
session = vici_session()
except Exception:
raise ViciInitiateError("IPsec not initialized")
try:
vici_dict: dict= {}
if ike_name:
vici_dict['ike'] = ike_name
if child_name:
vici_dict['child'] = child_name
session_generator = session.terminate(vici_dict)
# a dummy `for` loop is required because of requirements
# from vici. Without a full iteration on the output, the
# command to vici may not be executed completely
for _ in session_generator:
pass
except Exception:
if child_name:
raise ViciCommandError(
f'Failed to terminate SA for IPSEC {child_name}')
else:
raise ViciCommandError(
f'Failed to terminate SA for IKE {ike_name}')
def vici_initiate(ike_sa_name: str, child_sa_name: str, src_addr: str,
dst_addr: str) -> bool:
"""Initiate IKE SA connection with specific peer
Args:
ike_sa_name (str): an IKE SA connection name
child_sa_name (str): a child SA profile name
src_addr (str): source address
dst_addr (str): remote address
Returns:
bool: a result of initiation command
"""
from vici import Session as vici_session
try:
session = vici_session()
except Exception:
raise ViciInitiateError("IPsec not initialized")
try:
session_generator = session.initiate({
'ike': ike_sa_name,
'child': child_sa_name,
'timeout': '-1',
'my-host': src_addr,
'other-host': dst_addr
})
# a dummy `for` loop is required because of requirements
# from vici. Without a full iteration on the output, the
# command to vici may not be executed completely
for _ in session_generator:
pass
return True
except Exception:
raise ViciCommandError(f'Failed to initiate SA for IKE {ike_sa_name}')

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