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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 jinja2 import FileSystemLoader, Environment
from sys import exit
from vyos.config import Config
from vyos.defaults import directories as vyos_data_dir
from vyos import ConfigError
from vyos.util import run
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()
if not conf.exists('service ssh'):
return None
else:
conf.set_level('service ssh')
if conf.exists('access-control allow user'):
allow_users = conf.return_values('access-control allow user')
ssh['allow_users'] = allow_users
if conf.exists('access-control allow group'):
allow_groups = conf.return_values('access-control allow group')
ssh['allow_groups'] = allow_groups
if conf.exists('access-control deny user'):
deny_users = conf.return_values('access-control deny user')
ssh['deny_users'] = deny_users
if conf.exists('access-control deny group'):
deny_groups = conf.return_values('access-control deny group')
ssh['deny_groups'] = deny_groups
if conf.exists('ciphers'):
ciphers = conf.return_values('ciphers')
ssh['ciphers'] = ciphers
if conf.exists('disable-host-validation'):
ssh['host_validation'] = 'no'
if conf.exists('disable-password-authentication'):
ssh['password_authentication'] = 'no'
if conf.exists('key-exchange'):
kex = conf.return_values('key-exchange')
ssh['key_exchange'] = kex
if conf.exists('listen-address'):
# 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?
addresses = conf.return_values('listen-address')
listen = []
for addr in addresses:
listen.append(addr)
ssh['listen_on'] = listen
if conf.exists('loglevel'):
ssh['log_level'] = conf.return_value('loglevel')
if conf.exists('mac'):
mac = conf.return_values('mac')
ssh['mac'] = mac
if conf.exists('port'):
ports = conf.return_values('port')
mport = []
for prt in ports:
mport.append(prt)
ssh['mport'] = mport
if conf.exists('client-keepalive-interval'):
client_keepalive = conf.return_value('client-keepalive-interval')
ssh['client_keepalive'] = client_keepalive
return ssh
def verify(ssh):
if ssh is None:
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 ssh is None:
return None
# Prepare Jinja2 template loader from files
tmpl_path = os.path.join(vyos_data_dir['data'], 'templates', 'ssh')
fs_loader = FileSystemLoader(tmpl_path)
env = Environment(loader=fs_loader, trim_blocks=True)
tmpl = env.get_template('sshd_config.tmpl')
config_text = tmpl.render(ssh)
with open(config_file, 'w') as f:
f.write(config_text)
return None
def apply(ssh):
if ssh is not None and 'port' in ssh.keys():
run("sudo systemctl restart ssh.service")
else:
# SSH access is removed in the commit
run("sudo systemctl stop ssh.service")
if os.path.isfile(config_file):
os.unlink(config_file)
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 (4 KB)

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