diff options
Diffstat (limited to 'src/conf_mode/accel_l2tp.py')
| -rwxr-xr-x | src/conf_mode/accel_l2tp.py | 466 |
1 files changed, 466 insertions, 0 deletions
diff --git a/src/conf_mode/accel_l2tp.py b/src/conf_mode/accel_l2tp.py new file mode 100755 index 000000000..39732b97d --- /dev/null +++ b/src/conf_mode/accel_l2tp.py @@ -0,0 +1,466 @@ +#!/usr/bin/env python3 +# +# Copyright (C) 2019 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_l2tp.pid' +l2tp_cnf_dir = r'/etc/accel-ppp/l2tp' +chap_secrets = l2tp_cnf_dir + '/chap-secrets' +l2tp_conf = l2tp_cnf_dir + '/l2tp.config' +# accel-pppd -d -c /etc/accel-ppp/l2tp/l2tp.config -p /var/run/accel_l2tp.pid + +### config path creation +if not os.path.exists(l2tp_cnf_dir): + os.makedirs(l2tp_cnf_dir) + sl.syslog(sl.LOG_NOTICE, l2tp_cnf_dir + " created") + +l2tp_config = ''' +### generated by accel_l2tp.py ### +[modules] +log_syslog +l2tp +chap-secrets +{% for proto in authentication['auth_proto']: %} +{{proto}} +{% endfor%} +{% if authentication['mode'] == 'radius' %} +radius +{% endif -%} +ippool +shaper + +[core] +thread-count={{thread_cnt}} + +[log] +syslog=accel-l2tp,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 -%} + +[l2tp] +verbose=1 +ppp-max-mtu={{mtu}} +mppe={{authentication['mppe']}} +{% if outside_addr %} +bind={{outside_addr}} +{% endif %} + +[client-ip-range] +0.0.0.0/0 + +{% if (client_ip_pool) or (client_ip_subnets) %} +[ip-pool] +{% if client_ip_pool %} +{{client_ip_pool}} +{% endif -%} +{% if client_ip_subnets %} +{% for sn in client_ip_subnets %} +{{sn}} +{% endfor -%} +{% endif %} +{% endif %} +{% if outside_nexthop %} +gw-ip-address={{outside_nexthop}} +{% endif %} + +{% if authentication['mode'] == 'local' %} +[chap-secrets] +chap-secrets=/etc/accel-ppp/l2tp/chap-secrets +{% endif %} + +[ppp] +verbose=1 +check-ip=1 +single-session=replace +{% if idle_timeout%} +lcp-echo-timeout={{idle_timeout}} +{% endif %} +lcp-echo-interval=30 + +{% 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 %} +{% if authentication['radiusopt']['timeout'] %} +timeout={{authentication['radiusopt']['timeout']}} +{% endif %} +{% if authentication['radiusopt']['acct-timeout'] %} +acct-timeout={{authentication['radiusopt']['acct-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 -%} +gw-ip-address={{outside_nexthop}} +verbose=1 +{% 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=127.0.0.1:2004 + +''' + +### l2tp 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", 2004)) + break + except ConnectionRefusedError: + time.sleep(0.5) + cnt +=1 + if cnt == 100: + raise("failed to start l2tp 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','2004',cmd]).decode().strip() + return ret + except: + return 1 + +### +# inline helper functions end +### + +def get_config(): + c = Config() + if not c.exists('vpn l2tp remote-access '): + return None + + c.set_level('vpn l2tp remote-access') + config_data = { + 'authentication' : { + 'mode' : 'local', + 'local-users' : { + }, + 'radiussrv' : {}, + 'radiusopt' : {}, + 'auth_proto' : [], + 'mppe' : 'prefer' + }, + 'outside_addr' : '', + 'outside_nexthop' : '', + 'dns' : [], + 'wins' : [], + 'client_ip_pool' : None, + 'client_ip_subnets' : [], + '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' : '*', + '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') + + ### 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 + } + } + ) + + #### 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'): + # Set default dae-server port if not defined + if c.exists('authentication radius-settings dae-server port'): + dae_server_port = c.return_value('authentication radius-settings dae-server port') + else: + dae_server_port = "3799" + config_data['authentication']['radiusopt'].update( + { + 'dae-srv' : { + 'ip-addr' : c.return_value('authentication radius-settings dae-server ip-address'), + 'port' : dae_server_port, + 'secret' : str(c.return_value('authentication radius-settings dae-server secret')) + } + } + ) + #### filter-id is the internal accel default if attribute is empty + #### set here as default for visibility which may change in the future + 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('client-ip-pool'): + if c.exists('client-ip-pool start') and c.exists('client-ip-pool stop'): + config_data['client_ip_pool'] = c.return_value('client-ip-pool start') + '-' + re.search('[0-9]+$', c.return_value('client-ip-pool stop')).group(0) + + if c.exists('client-ip-pool subnet'): + config_data['client_ip_subnets'] = c.return_values('client-ip-pool subnet') + + if c.exists('mtu'): + config_data['mtu'] = c.return_value('mtu') + + ### gateway address + if c.exists('outside-nexthop'): + config_data['outside_nexthop'] = c.return_value('outside-nexthop') + + if c.exists('authentication require'): + auth_mods = {'pap' : 'pap','chap' : 'auth_chap_md5', 'mschap' : 'auth_mschap_v1', 'mschap-v2' : 'auth_mschap_v2'} + for proto in c.return_values('authentication require'): + config_data['authentication']['auth_proto'].append(auth_mods[proto]) + else: + config_data['authentication']['auth_proto'] = ['auth_mschap_v2'] + + if c.exists('authentication mppe'): + config_data['authentication']['mppe'] = c.return_value('authentication mppe') + + if c.exists('idle'): + config_data['idle_timeout'] = c.return_value('idle') + + return config_data + +def verify(c): + if c == None: + return None + + if c['authentication']['mode'] == 'local': + if not c['authentication']['local-users']: + raise ConfigError('l2tp-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') + + ### check for the existence of a client ip pool + if not c['client_ip_pool'] and not c['client_ip_subnets']: + raise ConfigError("set vpn l2tp remote-access client-ip-pool requires subnet or start/stop IP pool") + + if not c['outside_nexthop']: + #raise ConfigError('set vpn l2tp remote-access outside-nexthop required') + print ("WARMING: set vpn l2tp remote-access outside-nexthop required") + +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(l2tp_config, trim_blocks=True) + config_text = tmpl.render(c) + open(l2tp_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',l2tp_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) |