vpn_sstp.py
No OneTemporary
Actions

Size

17 KB

Referenced Files

None

Subscribers

None

vpn_sstp.py
View Options

	#!/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 sys
	import os
	import re
	import subprocess
	import jinja2
	import socket
	import time
	import syslog as sl

	from vyos.config import Config
	from vyos import ConfigError

	pidfile = r'/var/run/accel_sstp.pid'
	sstp_cnf_dir = r'/etc/accel-ppp/sstp'
	chap_secrets = sstp_cnf_dir + '/chap-secrets'
	sstp_conf = sstp_cnf_dir + '/sstp.config'
	ssl_cert_dir = r'/config/user-data/sstp'

	### config path creation
	if not os.path.exists(sstp_cnf_dir):
	os.makedirs(sstp_cnf_dir)
	sl.syslog(sl.LOG_NOTICE, sstp_cnf_dir + " created")

	if not os.path.exists(ssl_cert_dir):
	os.makedirs(ssl_cert_dir)
	sl.syslog(sl.LOG_NOTICE, ssl_cert_dir + " created")

	sstp_config = '''
	### generated by vpn_sstp.py ###
	[modules]
	log_syslog
	sstp
	ippool
	shaper
	{% if authentication['mode'] == 'local' %}
	chap-secrets
	{% endif -%}
	{% for proto in authentication['auth_proto'] %}
	{{proto}}
	{% endfor %}
	{% if authentication['mode'] == 'radius' %}
	radius
	{% endif %}

	[core]
	thread-count={{thread_cnt}}

	[common]
	single-session=replace

	[log]
	syslog=accel-sstp,daemon
	copy=1
	level=5

	[client-ip-range]
	disable

	[sstp]
	verbose=1
	accept=ssl
	{% if certs %}
	ssl-ca-file=/config/user-data/sstp/{{certs['ca']}}
	ssl-pemfile=/config/user-data/sstp/{{certs['server-cert']}}
	ssl-keyfile=/config/user-data/sstp/{{certs['server-key']}}
	{% endif %}

	{%if ip_pool %}
	[ip-pool]
	gw-ip-address={{gw}}
	{% for sn in ip_pool %}
	{{sn}}
	{% endfor %}
	{% endif %}

	{% if dnsv4 %}
	[dns]
	{% if dnsv4['primary'] %}
	dns1={{dnsv4['primary']}}
	{% endif -%}
	{% if dnsv4['secondary'] %}
	dns2={{dnsv4['secondary']}}
	{% endif -%}
	{% endif %}

	{% if authentication['mode'] == 'local' %}
	[chap-secrets]
	chap-secrets=/etc/accel-ppp/sstp/chap-secrets
	{% endif %}

	{%- if authentication['mode'] == 'radius' %}
	[radius]
	verbose=1
	{% for rsrv in authentication['radius-srv']: %}
	server={{rsrv}},{{authentication['radius-srv'][rsrv]['secret']}},\
	req-limit={{authentication['radius-srv'][rsrv]['req-limit']}},\
	fail-time={{authentication['radius-srv'][rsrv]['fail-time']}}
	{% endfor -%}
	{% if authentication['radiusopt']['acct-timeout'] %}
	acct-timeout={{authentication['radiusopt']['acct-timeout']}}
	{% endif -%}
	{% if authentication['radiusopt']['timeout'] %}
	timeout={{authentication['radiusopt']['timeout']}}
	{% endif -%}
	{% if authentication['radiusopt']['max-try'] %}
	max-try={{authentication['radiusopt']['max-try']}}
	{% endif -%}
	{% if authentication['radiusopt']['nas-id'] %}
	nas-identifier={{authentication['radiusopt']['nas-id']}}
	{% endif -%}
	{% if authentication['radiusopt']['nas-ip'] %}
	nas-ip-address={{authentication['radiusopt']['nas-ip']}}
	{% endif -%}
	{% if authentication['radiusopt']['dae-srv'] %}
	dae-server={{authentication['radiusopt']['dae-srv']['ip-addr']}}:\
	{{authentication['radiusopt']['dae-srv']['port']}},\
	{{authentication['radiusopt']['dae-srv']['secret']}}
	{% endif -%}
	{% endif %}

	[ppp]
	verbose=1
	check-ip=1
	{% if mtu %}
	mtu={{mtu}}
	{% endif -%}
	{% if ppp['mppe'] %}
	mppe={{ppp['mppe']}}
	{% endif -%}
	{% if ppp['lcp-echo-interval'] %}
	lcp-echo-interval={{ppp['lcp-echo-interval']}}
	{% endif -%}
	{% if ppp['lcp-echo-failure'] %}
	lcp-echo-failure={{ppp['lcp-echo-failure']}}
	{% endif -%}
	{% if ppp['lcp-echo-timeout'] %}
	lcp-echo-timeout={{ppp['lcp-echo-timeout']}}
	{% endif %}

	{% if authentication['radiusopt']['shaper'] %}
	[shaper]
	verbose=1
	attr={{authentication['radiusopt']['shaper']['attr']}}
	{% if authentication['radiusopt']['shaper']['vendor'] %}
	vendor={{authentication['radiusopt']['shaper']['vendor']}}
	{% endif -%}
	{% endif %}

	[cli]
	tcp=127.0.0.1:2005
	'''

	### sstp chap secrets
	chap_secrets_conf = '''
	# username server password acceptable local IP addresses shaper
	{% for user in authentication['local-users'] %}
	{% if authentication['local-users'][user]['state'] == 'enabled' %}
	{% if (authentication['local-users'][user]['upload']) and (authentication['local-users'][user]['download']) %}
	{{user}}\t*\t{{authentication['local-users'][user]['passwd']}}\t{{authentication['local-users'][user]['ip']}}\t\
	{{authentication['local-users'][user]['download']}}/{{authentication['local-users'][user]['upload']}}
	{% else %}
	{{user}}\t*\t{{authentication['local-users'][user]['passwd']}}\t{{authentication['local-users'][user]['ip']}}
	{% endif %}
	{% endif %}
	{% endfor %}
	'''
	###
	# inline helper functions
	###
	# depending on hw and threads, daemon needs a little to start
	# if it takes longer than 100 * 0.5 secs, exception is being raised
	# not sure if that's the best way to check it, but it worked so far quite well
	###
	def chk_con():
	cnt = 0
	s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
	while True:
	try:
	s.connect(("127.0.0.1", 2005))
	s.close()
	break
	except ConnectionRefusedError:
	time.sleep(0.5)
	cnt +=1
	if cnt == 100:
	raise("failed to start sstp server")
	break

	### chap_secrets file if auth mode local
	def write_chap_secrets(c):
	tmpl = jinja2.Template(chap_secrets_conf, trim_blocks=True)
	chap_secrets_txt = tmpl.render(c)
	old_umask = os.umask(0o077)
	open(chap_secrets,'w').write(chap_secrets_txt)
	os.umask(old_umask)
	sl.syslog(sl.LOG_NOTICE, chap_secrets + ' written')

	def accel_cmd(cmd=''):
	if not cmd:
	return None
	try:
	ret = subprocess.check_output(['/usr/bin/accel-cmd','-p','2005',cmd]).decode().strip()
	return ret
	except:
	return 1

	#### check ig local-ip is in client pool subnet


	###
	# inline helper functions end
	###

	def get_config():
	base_path = ['vpn', 'sstp']
	c = Config()
	if not c.exists(base_path):
	return None

	c.set_level(base_path)

	config_data = {
	'authentication' : {
	'local-users' : {
	},
	'mode' : 'local',
	'auth_proto' : [],
	'radius-srv' : {},
	'radiusopt' : {},
	'dae-srv' : {}
	},
	'certs' : {
	'ca' : None,
	'server-key' : None,
	'server-cert' : None
	},
	'ip_pool' : [],
	'gw' : None,
	'dnsv4' : {},
	'mtu' : None,
	'ppp' : {},
	}

	### local auth
	if c.exists('authentication mode local'):
	if c.exists('authentication local-users'):
	for usr in c.list_nodes('authentication local-users username'):
	config_data['authentication']['local-users'].update(
	{
	usr : {
	'passwd' : None,
	'state' : 'enabled',
	'ip' : '*',
	'upload' : None,
	'download' : None
	}
	}
	)
	if c.exists('authentication local-users username ' + usr + ' password'):
	config_data['authentication']['local-users'][usr]['passwd'] = c.return_value('authentication local-users username ' + usr + ' password')
	if c.exists('authentication local-users username ' + usr + ' disable'):
	config_data['authentication']['local-users'][usr]['state'] = 'disable'
	if c.exists('authentication local-users username ' + usr + ' static-ip'):
	config_data['authentication']['local-users'][usr]['ip'] = c.return_value('authentication local-users username ' + usr + ' static-ip')
	if c.exists('authentication local-users username ' + usr + ' rate-limit download'):
	config_data['authentication']['local-users'][usr]['download'] = c.return_value('authentication local-users username ' + usr + ' rate-limit download')
	if c.exists('authentication local-users username ' + usr + ' rate-limit upload'):
	config_data['authentication']['local-users'][usr]['upload'] = c.return_value('authentication local-users username ' + usr + ' rate-limit upload')

	if c.exists('authentication protocols'):
	auth_mods = {'pap' : 'pap','chap' : 'auth_chap_md5', 'mschap' : 'auth_mschap_v1', 'mschap-v2' : 'auth_mschap_v2'}
	for proto in c.return_values('authentication protocols'):
	config_data['authentication']['auth_proto'].append(auth_mods[proto])
	else:
	config_data['authentication']['auth_proto'] = ['auth_mschap_v2']

	#### RADIUS auth and settings
	if c.exists('authentication mode radius'):
	config_data['authentication']['mode'] = c.return_value('authentication mode')
	if c.exists('authentication radius-server'):
	for rsrv in c.list_nodes('authentication radius-server'):
	config_data['authentication']['radius-srv'][rsrv] = {}
	if c.exists('authentication radius-server ' + rsrv + ' secret'):
	config_data['authentication']['radius-srv'][rsrv]['secret'] = c.return_value('authentication radius-server ' + rsrv + ' secret')
	else:
	config_data['authentication']['radius-srv'][rsrv]['secret'] = None
	if c.exists('authentication radius-server ' + rsrv + ' fail-time'):
	config_data['authentication']['radius-srv'][rsrv]['fail-time'] = c.return_value('authentication radius-server ' + rsrv + ' fail-time')
	else:
	config_data['authentication']['radius-srv'][rsrv]['fail-time'] = 0
	if c.exists('authentication radius-server ' + rsrv + ' req-limit'):
	config_data['authentication']['radius-srv'][rsrv]['req-limit'] = c.return_value('authentication radius-server ' + rsrv + ' req-limit')
	else:
	config_data['authentication']['radius-srv'][rsrv]['req-limit'] = 0

	#### advanced radius-setting
	if c.exists('authentication radius-settings'):
	if c.exists('authentication radius-settings acct-timeout'):
	config_data['authentication']['radiusopt']['acct-timeout'] = c.return_value('authentication radius-settings acct-timeout')
	if c.exists('authentication radius-settings max-try'):
	config_data['authentication']['radiusopt']['max-try'] = c.return_value('authentication radius-settings max-try')
	if c.exists('authentication radius-settings timeout'):
	config_data['authentication']['radiusopt']['timeout'] = c.return_value('authentication radius-settings timeout')
	if c.exists('authentication radius-settings nas-identifier'):
	config_data['authentication']['radiusopt']['nas-id'] = c.return_value('authentication radius-settings nas-identifier')
	if c.exists('authentication radius-settings nas-ip-address'):
	config_data['authentication']['radiusopt']['nas-ip'] = c.return_value('authentication radius-settings nas-ip-address')
	if c.exists('authentication radius-settings dae-server'):
	config_data['authentication']['radiusopt'].update(
	{
	'dae-srv' : {
	'ip-addr' : c.return_value('authentication radius-settings dae-server ip-address'),
	'port' : c.return_value('authentication radius-settings dae-server port'),
	'secret' : str(c.return_value('authentication radius-settings dae-server secret'))
	}
	}
	)
	if c.exists('authentication radius-settings rate-limit enable'):
	if not c.exists('authentication radius-settings rate-limit attribute'):
	config_data['authentication']['radiusopt']['shaper'] = { 'attr' : 'Filter-Id' }
	else:
	config_data['authentication']['radiusopt']['shaper'] = {
	'attr' : c.return_value('authentication radius-settings rate-limit attribute')
	}
	if c.exists('authentication radius-settings rate-limit vendor'):
	config_data['authentication']['radiusopt']['shaper']['vendor'] = c.return_value('authentication radius-settings rate-limit vendor')

	if c.exists('sstp-settings ssl-certs ca'):
	config_data['certs']['ca'] = c.return_value('sstp-settings ssl-certs ca')
	if c.exists('sstp-settings ssl-certs server-cert'):
	config_data['certs']['server-cert'] = c.return_value('sstp-settings ssl-certs server-cert')
	if c.exists('sstp-settings ssl-certs server-key'):
	config_data['certs']['server-key'] = c.return_value('sstp-settings ssl-certs server-key')

	if c.exists('network-settings client-ip-settings subnet'):
	config_data['ip_pool'] = c.return_values('network-settings client-ip-settings subnet')
	if c.exists('network-settings client-ip-settings gateway-address'):
	config_data['gw'] = c.return_value('network-settings client-ip-settings gateway-address')
	if c.exists('network-settings dns-server primary-dns'):
	config_data['dnsv4']['primary'] = c.return_value('network-settings dns-server primary-dns')
	if c.exists('network-settings dns-server secondary-dns'):
	config_data['dnsv4']['secondary'] = c.return_value('network-settings dns-server secondary-dns')
	if c.exists('network-settings mtu'):
	config_data['mtu'] = c.return_value('network-settings mtu')

	#### ppp
	if c.exists('ppp-settings mppe'):
	config_data['ppp']['mppe'] = c.return_value('ppp-settings mppe')
	if c.exists('ppp-settings lcp-echo-failure'):
	config_data['ppp']['lcp-echo-failure'] = c.return_value('ppp-settings lcp-echo-failure')
	if c.exists('ppp-settings lcp-echo-interval'):
	config_data['ppp']['lcp-echo-interval'] = c.return_value('ppp-settings lcp-echo-interval')
	if c.exists('ppp-settings lcp-echo-timeout'):
	config_data['ppp']['lcp-echo-timeout'] = c.return_value('ppp-settings lcp-echo-timeout')

	return config_data

	def verify(c):
	if c == None:
	return None
	### vertify auth settings
	if c['authentication']['mode'] == 'local':
	if not c['authentication']['local-users']:
	raise ConfigError('sstp-server authentication local-users required')

	for usr in c['authentication']['local-users']:
	if not c['authentication']['local-users'][usr]['passwd']:
	raise ConfigError('user ' + usr + ' requires a password')
	### if up/download is set, check that both have a value
	if c['authentication']['local-users'][usr]['upload']:
	if not c['authentication']['local-users'][usr]['download']:
	raise ConfigError('user ' + usr + ' requires download speed value')
	if c['authentication']['local-users'][usr]['download']:
	if not c['authentication']['local-users'][usr]['upload']:
	raise ConfigError('user ' + usr + ' requires upload speed value')

	if not c['certs']['ca'] or not c['certs']['server-key'] or not c['certs']['server-cert']:
	raise ConfigError('service sstp-server sstp-settings ssl-certs needs the ssl certificates set up')
	else:
	ssl_path = ssl_cert_dir + '/'
	if not os.path.exists(ssl_path + c['certs']['ca']):
	raise ConfigError('CA {0} doesn\'t exist'.format(ssl_path + c['certs']['ca']))
	if not os.path.exists(ssl_path + c['certs']['server-cert']):
	raise ConfigError('SSL Cert {0} doesn\'t exist'.format(ssl_path + c['certs']['server-cert']))
	if not os.path.exists(ssl_path + c['certs']['server-cert']):
	raise ConfigError('SSL Key {0} doesn\'t exist'.format(ssl_path + c['certs']['server-key']))

	if c['authentication']['mode'] == 'radius':
	if len(c['authentication']['radius-srv']) == 0:
	raise ConfigError('service sstp-server authentication radius-server needs a value')
	for rsrv in c['authentication']['radius-srv']:
	if c['authentication']['radius-srv'][rsrv]['secret'] == None:
	raise ConfigError('service sstp-server authentication radius-server {0} secret requires a value'.format(rsrv))

	if c['authentication']['mode'] == 'local':
	if not c['ip_pool']:
	print ("WARNING: service sstp-server network-settings client-ip-settings subnet requires a value")
	if not c['gw']:
	print ("WARNING: service sstp-server network-settings client-ip-settings gateway-address requires a value")

	def generate(c):
	if c == None:
	return None

	### accel-cmd reload doesn't work so any change results in a restart of the daemon
	try:
	if os.cpu_count() == 1:
	c['thread_cnt'] = 1
	else:
	c['thread_cnt'] = int(os.cpu_count()/2)
	except KeyError:
	if os.cpu_count() == 1:
	c['thread_cnt'] = 1
	else:
	c['thread_cnt'] = int(os.cpu_count()/2)

	tmpl = jinja2.Template(sstp_config, trim_blocks=True)
	config_text = tmpl.render(c)
	open(sstp_conf,'w').write(config_text)

	if c['authentication']['local-users']:
	write_chap_secrets(c)

	return c

	def apply(c):
	if c == None:
	if os.path.exists(pidfile):
	accel_cmd('shutdown hard')
	if os.path.exists(pidfile):
	os.remove(pidfile)
	return None

	if not os.path.exists(pidfile):
	ret = subprocess.call(['/usr/sbin/accel-pppd','-c',sstp_conf,'-p',pidfile,'-d'])
	chk_con()
	if ret !=0 and os.path.exists(pidfile):
	os.remove(pidfile)
	raise ConfigError('accel-pppd failed to start')
	else:
	accel_cmd('restart')
	sl.syslog(sl.LOG_NOTICE, "reloading config via daemon restart")

	if __name__ == '__main__':
	try:
	c = get_config()
	verify(c)
	generate(c)
	apply(c)
	except ConfigError as e:
	print(e)
	sys.exit(1)

File Metadata

Mime Type: text/x-script.python
Expires: Sat, Oct 17, 12:50 AM (1 d, 13 h)
Storage Engine: blob
Storage Format: Raw Data
Storage Handle: 4355350
Default Alt Text: vpn_sstp.py (17 KB)

vpn_sstp.pyNo OneTemporaryActions

vpn_sstp.pyView Options

File Metadata

Event Timeline

vpn_sstp.py
No OneTemporary
Actions

vpn_sstp.py
View Options