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ssh.py
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ssh.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018-2020 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 import ConfigError
from vyos.util import call
from vyos.template import render
from vyos import airbag
airbag.enable()
config_file = r'/etc/ssh/sshd_config'
default_config_data = {
'port' : '22',
'log_level': 'INFO',
'password_authentication': 'yes',
'host_validation': 'yes'
}
def get_config():
ssh = default_config_data
conf = Config()
base = ['service', 'ssh']
if not conf.exists(base):
return None
else:
conf.set_level(base)
tmp = ['access-control', 'allow', 'user']
if conf.exists(tmp):
ssh['allow_users'] = conf.return_values(tmp)
tmp = ['access-control', 'allow', 'group']
if conf.exists(tmp):
ssh['allow_groups'] = conf.return_values(tmp)
tmp = ['access-control', 'deny' 'user']
if conf.exists(tmp):
ssh['deny_users'] = conf.return_values(tmp)
tmp = ['access-control', 'deny', 'group']
if conf.exists(tmp):
ssh['deny_groups'] = conf.return_values(tmp)
tmp = ['ciphers']
if conf.exists(tmp):
ssh['ciphers'] = conf.return_values(tmp)
tmp = ['key-exchange']
if conf.exists(tmp):
ssh['key_exchange'] = conf.return_values(tmp)
if conf.exists(['disable-host-validation']):
ssh['host_validation'] = 'no'
if conf.exists(['disable-password-authentication']):
ssh['password_authentication'] = 'no'
tmp = ['listen-address']
if conf.exists(tmp):
# We can listen on both IPv4 and IPv6 addresses
# Maybe there could be a check in the future if the configured IP address
# is configured on this system at all?
ssh['listen_on'] = conf.return_values(tmp)
tmp = ['loglevel']
if conf.exists(tmp):
ssh['log_level'] = conf.return_value(tmp)
tmp = ['mac']
if conf.exists(tmp):
ssh['mac'] = conf.return_values(tmp)
tmp = ['port']
if conf.exists(tmp):
ssh['port'] = conf.return_values(tmp)
tmp = ['client-keepalive-interval']
if conf.exists(tmp):
ssh['client_keepalive'] = conf.return_value(tmp)
return ssh
def verify(ssh):
if not ssh:
return None
if 'loglevel' in ssh.keys():
allowed_loglevel = 'QUIET, FATAL, ERROR, INFO, VERBOSE'
if not ssh['loglevel'] in allowed_loglevel:
raise ConfigError('loglevel must be one of "{0}"\n'.format(allowed_loglevel))
return None
def generate(ssh):
if not ssh:
return None
render(config_file, 'ssh/sshd_config.tmpl', ssh, trim_blocks=True)
return None
def apply(ssh):
if not ssh:
# SSH access is removed in the commit
call('systemctl stop ssh.service')
if os.path.isfile(config_file):
os.unlink(config_file)
else:
call('systemctl restart ssh.service')
return None
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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ssh.py (3 KB)

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