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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/>.
import base64
import os
import struct
from sys import exit
from vyos.config import Config
from vyos.util import call
from vyos import ConfigError
from vyos import airbag
from Cryptodome.PublicKey.RSA import construct
airbag.enable()
LOCAL_KEY_PATHS = ['/config/auth/', '/config/ipsec.d/rsa-keys/']
LOCAL_OUTPUT = '/etc/swanctl/pubkey/localhost.pub'
LOCAL_KEY_OUTPUT = '/etc/swanctl/private/localhost.key'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['vpn', 'rsa-keys']
if not conf.exists(base):
return None
return conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True)
def verify(conf):
if not conf:
return
if 'local_key' in conf and 'file' in conf['local_key']:
local_key = conf['local_key']['file']
if not local_key:
raise ConfigError(f'Invalid local-key')
if not get_local_key(local_key):
raise ConfigError(f'File not found for local-key: {local_key}')
def get_local_key(local_key):
for path in LOCAL_KEY_PATHS:
full_path = os.path.join(path, local_key)
if os.path.exists(full_path):
return full_path
return False
def generate(conf):
if not conf:
return
if 'local_key' in conf and 'file' in conf['local_key']:
local_key = conf['local_key']['file']
local_key_path = get_local_key(local_key)
call(f'sudo cp -f {local_key_path} {LOCAL_KEY_OUTPUT}')
call(f'sudo /usr/bin/openssl rsa -in {local_key_path} -pubout -out {LOCAL_OUTPUT}')
if 'rsa_key_name' in conf:
for key_name, key_conf in conf['rsa_key_name'].items():
if 'rsa_key' not in key_conf:
continue
remote_key = key_conf['rsa_key']
if remote_key[:2] == "0s": # Vyatta format
remote_key = migrate_from_vyatta_key(remote_key)
else:
remote_key = bytes('-----BEGIN PUBLIC KEY-----\n' + remote_key + '\n-----END PUBLIC KEY-----\n', 'utf-8')
with open(f'/etc/swanctl/pubkey/{key_name}.pub', 'wb') as f:
f.write(remote_key)
def migrate_from_vyatta_key(data):
data = base64.b64decode(data[2:])
length = struct.unpack('B', data[:1])[0]
e = int.from_bytes(data[1:1+length], 'big')
n = int.from_bytes(data[1+length:], 'big')
pubkey = construct((n, e))
return pubkey.exportKey(format='PEM')
def apply(conf):
if not conf:
return
call('sudo /usr/sbin/ipsec rereadall')
call('sudo /usr/sbin/ipsec reload')
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
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