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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 netifaces import interfaces
from sys import exit
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos import ConfigError
from vyos.util import call
from vyos.template import render
from vyos.xml import defaults
from vyos import airbag
airbag.enable()
config_file = r'/run/ssh/sshd_config'
systemd_override = r'/etc/systemd/system/ssh.service.d/override.conf'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['service', 'ssh']
if not conf.exists(base):
return None
ssh = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
# We have gathered the dict representation of the CLI, but there are default
# options which we need to update into the dictionary retrived.
default_values = defaults(base)
ssh = dict_merge(default_values, ssh)
# pass config file path - used in override template
ssh['config_file'] = config_file
return ssh
def verify(ssh):
if not ssh:
return None
if 'vrf' in ssh.keys() and ssh['vrf'] not in interfaces():
raise ConfigError('VRF "{vrf}" does not exist'.format(**ssh))
return None
def generate(ssh):
if not ssh:
if os.path.isfile(config_file):
os.unlink(config_file)
if os.path.isfile(systemd_override):
os.unlink(systemd_override)
return None
render(config_file, 'ssh/sshd_config.tmpl', ssh, trim_blocks=True)
render(systemd_override, 'ssh/override.conf.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')
# Reload systemd manager configuration
call('systemctl daemon-reload')
if ssh:
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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