#!/usr/bin/env python3 # # Copyright (C) 2018 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 . # # 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_pptp.pid' pptp_cnf_dir = r'/etc/accel-ppp/pptp' chap_secrets = pptp_cnf_dir + '/chap-secrets' pptp_conf = pptp_cnf_dir + '/pptp.config' # accel-pppd -d -c /etc/accel-ppp/pppoe/pppoe.config -p /var/run/accel_pppoe.pid ### config path creation if not os.path.exists(pptp_cnf_dir): os.makedirs(pptp_cnf_dir) sl.syslog(sl.LOG_NOTICE, pptp_cnf_dir + " created") pptp_config = ''' ### generated by accel_pptp.py ### [modules] log_syslog pptp ippool chap-secrets {% if authentication['auth_proto'] %} {{ authentication['auth_proto'] }} {% else %} auth_mschap_v2 {% endif %} {% if authentication['mode'] == 'radius' %} radius {% endif -%} [core] thread-count={{thread_cnt}} [log] syslog=accel-pptp,daemon copy=1 level=5 {% if dns %} [dns] {% if dns[0] %} dns1={{dns[0]}} {% endif %} {% if dns[1] %} dns2={{dns[1]}} {% endif %} {% endif %} {% if wins %} [wins] {% if wins[0] %} wins1={{wins[0]}} {% endif %} {% if wins[1] %} wins2={{wins[1]}} {% endif %} {% endif %} [pptp] ifname=pptp%d {% if outside_addr %} bind={{outside_addr}} {% endif %} verbose=1 ppp-max-mtu={{mtu}} mppe={{authentication['mppe']}} echo-interval=10 echo-failure=3 [client-ip-range] 0.0.0.0/0 [ip-pool] tunnel={{client_ip_pool}} gw-ip-address={{gw_ip}} {% if authentication['mode'] == 'local' %} [chap-secrets] chap-secrets=/etc/accel-ppp/pptp/chap-secrets {% endif %} [ppp] verbose=5 check-ip=1 single-session=replace {% if authentication['mode'] == 'radius' %} [radius] {% for rsrv in authentication['radiussrv']: %} server={{rsrv}},{{authentication['radiussrv'][rsrv]['secret']}},\ req-limit={{authentication['radiussrv'][rsrv]['req-limit']}},\ fail-time={{authentication['radiussrv'][rsrv]['fail-time']}} {% endfor %} timeout=30 acct-timeout=30 max-try=3 {%endif %} [cli] tcp=127.0.0.1:2003 ''' ### pptp chap secrets chap_secrets_conf = ''' # username server password acceptable local IP addresses {% for user in authentication['local-users'] %} {% if authentication['local-users'][user]['state'] == 'enabled' %} {{user}}\t*\t{{authentication['local-users'][user]['passwd']}}\t{{authentication['local-users'][user]['ip']}} {% 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", 2003)) break except ConnectionRefusedError: time.sleep(0.5) cnt +=1 if cnt == 100: raise("failed to start pptp 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','2003',cmd]).decode().strip() return ret except: return 1 ### # inline helper functions end ### def get_config(): c = Config() if not c.exists('vpn pptp remote-access '): return None c.set_level('vpn pptp remote-access') config_data = { 'authentication' : { 'mode' : 'local', 'local-users' : { }, 'radiussrv' : {}, 'auth_proto' : 'auth_mschap_v2', 'mppe' : 'require' }, 'outside_addr' : '', 'dns' : [], 'wins' : [], 'client_ip_pool' : '', 'mtu' : '1436', } ### general options ### if c.exists('dns-servers server-1'): config_data['dns'].append( c.return_value('dns-servers server-1')) if c.exists('dns-servers server-2'): config_data['dns'].append( c.return_value('dns-servers server-2')) if c.exists('wins-servers server-1'): config_data['wins'].append( c.return_value('wins-servers server-1')) if c.exists('wins-servers server-2'): config_data['wins'].append( c.return_value('wins-servers server-2')) if c.exists('outside-address'): config_data['outside_addr'] = c.return_value('outside-address') ### auth local if c.exists('authentication mode local'): if c.exists('authentication local-users username'): for usr in c.list_nodes('authentication local-users username'): config_data['authentication']['local-users'].update( { usr : { 'passwd' : '', 'state' : 'enabled', 'ip' : '' } } ) 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') ### authentication mode radius servers and settings if c.exists('authentication mode radius'): config_data['authentication']['mode'] = 'radius' rsrvs = c.list_nodes('authentication radius server') for rsrv in rsrvs: if c.return_value('authentication radius server ' + rsrv + ' fail-time') == None: ftime = '0' else: ftime = str(c.return_value('authentication radius server ' + rsrv + ' fail-time')) if c.return_value('authentication radius-server ' + rsrv + ' req-limit') == None: reql = '0' else: reql = str(c.return_value('authentication radius server ' + rsrv + ' req-limit')) config_data['authentication']['radiussrv'].update( { rsrv : { 'secret' : c.return_value('authentication radius server ' + rsrv + ' key'), 'fail-time' : ftime, 'req-limit' : reql } } ) if c.exists('client-ip-pool'): if c.exists('client-ip-pool start'): config_data['client_ip_pool'] = c.return_value('client-ip-pool start') if c.exists('client-ip-pool stop'): config_data['client_ip_pool'] += '-' + re.search('[0-9]+$', c.return_value('client-ip-pool stop')).group(0) if c.exists('mtu'): config_data['mtu'] = c.return_value('mtu') ### gateway address if c.exists('gateway-address'): config_data['gw_ip'] = c.return_value('gateway-address') else: config_data['gw_ip'] = re.sub('[0-9]+$','1',config_data['client_ip_pool']) if c.exists('authentication require'): if c.return_value('authentication require') == 'pap': config_data['authentication']['auth_proto'] = 'auth_pap' if c.return_value('authentication require') == 'chap': config_data['authentication']['auth_proto'] = 'auth_chap_md5' if c.return_value('authentication require') == 'mschap': config_data['authentication']['auth_proto'] = 'auth_mschap_v1' if c.return_value('authentication require') == 'mschap-v2': config_data['authentication']['auth_proto'] = 'auth_mschap_v2' if c.exists('authentication mppe'): config_data['authentication']['mppe'] = c.return_value('authentication mppe') return config_data def verify(c): if c == None: return None if c['authentication']['mode'] == 'local': if not c['authentication']['local-users']: raise ConfigError('pptp-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 c['authentication']['mode'] == 'radius': if len(c['authentication']['radiussrv']) == 0: raise ConfigError('radius server required') for rsrv in c['authentication']['radiussrv']: if c['authentication']['radiussrv'][rsrv]['secret'] == None: raise ConfigError('radius server ' + rsrv + ' needs a secret configured') 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(pptp_config, trim_blocks=True) config_text = tmpl.render(c) open(pptp_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',pptp_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: ### if gw ip changes, only restart doesn't work 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)