#!/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 import jinja2 from time import sleep from sys import exit from subprocess import Popen, PIPE, check_output from socket import socket, AF_INET, SOCK_STREAM from copy import deepcopy from stat import S_IRUSR, S_IWUSR, S_IRGRP from psutil import pid_exists 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' # config path creation if not os.path.exists(sstp_cnf_dir): os.makedirs(sstp_cnf_dir) sstp_config = """### generated by vpn_sstp.py ### [modules] log_syslog sstp shaper {% if auth_mode == 'local' %} chap-secrets {% elif auth_mode == 'radius' %} radius {% endif -%} ippool {% for proto in auth_proto %} {{proto}} {% endfor %} [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 ssl-ca-file={{ ssl_ca }} ssl-pemfile={{ ssl_cert }} ssl-keyfile={{ ssl_key }} {% if client_ip_pool %} [ip-pool] gw-ip-address={{ client_gateway }} {% for subnet in client_ip_pool %} {{ subnet }} {% endfor %} {% endif %} {% if dnsv4 %} [dns] {% for dns in dnsv4 -%} dns{{ loop.index }}={{ dns }} {% endfor -%} {% endif %} {% if auth_mode == 'local' %} [chap-secrets] chap-secrets=/etc/accel-ppp/sstp/chap-secrets {% elif auth_mode == 'radius' %} [radius] verbose=1 {% for r in radius_server %} server={{ r.server }},{{ r.key }},auth-port={{ r.port }},req-limit=0,fail-time={{ r.fail_time }} {% endfor -%} acct-timeout={{ radius_acct_tmo }} timeout={{ radius_timeout }} max-try={{ radius_max_try }} {% if radius_nas_id %} nas-identifier={{ radius_nas_id }} {% endif -%} {% if radius_nas_ip %} nas-ip-address={{ radius_nas_ip }} {% endif -%} {% if radius_source_address %} bind={{ radius_source_address }} {% endif -%} {% if radius_dynamic_author %} dae-server={{ radius_dynamic_author.server }}:{{ radius_dynamic_author.port }},{{ radius_dynamic_author.key }} {% endif -%} {% endif %} [ppp] verbose=1 check-ip=1 {% if mtu %} mtu={{ mtu }} {% endif -%} {% if ppp_mppe %} mppe={{ ppp_mppe }} {% endif -%} {% if ppp_echo_interval %} lcp-echo-interval={{ ppp_echo_interval }} {% endif -%} {% if ppp_echo_failure %} lcp-echo-failure={{ ppp_echo_failure }} {% endif -%} {% if ppp_echo_timeout %} lcp-echo-timeout={{ ppp_echo_timeout }} {% endif %} {% if radius_shaper_attr %} [shaper] verbose=1 attr={{ radius_shaper_attr }} {% if radius_shaper_vendor %} vendor={{ radius_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 local_users %} {% if user.state == 'enabled' %} {% if user.upload and user.download %} {{ "%-12s" | format(user.name) }} * {{ "%-16s" | format(user.password) }} {{ "%-16s" | format(user.ip) }} {{ user.download }} / {{ user.upload }} {% else %} {{ "%-12s" | format(user.name) }} * {{ "%-16s" | format(user.password) }} {{ "%-16s" | format(user.ip) }} {% endif %} {% endif %} {% endfor %} """ def subprocess_cmd(command): p = Popen(command, stdout=PIPE, shell=True) p.communicate() def chk_con(): cnt = 0 s = socket(AF_INET, SOCK_STREAM) while True: try: s.connect(("127.0.0.1", 2005)) s.close() break except ConnectionRefusedError: sleep(0.5) cnt += 1 if cnt == 100: raise("failed to start sstp server") break def accel_cmd(cmd): if not cmd: return None try: ret = check_output(['/usr/bin/accel-cmd', '-p', '2005', cmd]) return ret.decode().strip() except: return 1 default_config_data = { 'local_users' : [], 'auth_mode' : 'local', 'auth_proto' : [], 'radius_server' : [], 'radius_acct_tmo' : '3', 'radius_max_try' : '3', 'radius_timeout' : '3', 'radius_nas_id' : '', 'radius_nas_ip' : '', 'radius_source_address' : '', 'radius_shaper_attr' : '', 'radius_shaper_vendor': '', 'radius_dynamic_author' : '', 'ssl_ca' : '', 'ssl_cert' : '', 'ssl_key' : '', 'client_ip_pool' : [], 'dnsv4' : [], 'mtu' : '', 'ppp_mppe' : '', 'ppp_echo_failure' : '', 'ppp_echo_interval' : '', 'ppp_echo_timeout' : '', 'thread_cnt' : '' } def get_config(): sstp = deepcopy(default_config_data) base_path = ['vpn', 'sstp'] conf = Config() if not conf.exists(base_path): return None conf.set_level(base_path) cpu = int(os.cpu_count()/2) if cpu < 1: cpu = 1 sstp['thread_cnt'] = cpu if conf.exists(['authentication', 'mode']): sstp['auth_mode'] = conf.return_value(['authentication', 'mode']) # # local auth if conf.exists(['authentication', 'local-users']): for username in conf.list_nodes(['authentication', 'local-users', 'username']): user = { 'name' : username, 'password' : '', 'state' : 'enabled', 'ip' : '*', 'upload' : None, 'download' : None } conf.set_level(base_path + ['authentication', 'local-users', 'username', username]) if conf.exists(['password']): user['password'] = conf.return_value(['password']) if conf.exists(['disable']): user['state'] = 'disable' if conf.exists(['static-ip']): user['ip'] = conf.return_value(['static-ip']) if conf.exists(['rate-limit', 'download']): user['download'] = conf.return_value(['rate-limit', 'download']) if conf.exists(['rate-limit', 'upload']): user['upload'] = conf.return_value(['rate-limit', 'upload']) sstp['local_users'].append(user) # # RADIUS auth and settings conf.set_level(base_path + ['authentication', 'radius']) if conf.exists(['server']): for server in conf.list_nodes(['server']): radius = { 'server' : server, 'key' : '', 'fail_time' : 0, 'port' : '1812' } conf.set_level(base_path + ['authentication', 'radius', 'server', server]) if conf.exists(['fail-time']): radius['fail-time'] = conf.return_value(['fail-time']) if conf.exists(['port']): radius['port'] = conf.return_value(['port']) if conf.exists(['key']): radius['key'] = conf.return_value(['key']) if not conf.exists(['disable']): sstp['radius_server'].append(radius) # # advanced radius-setting conf.set_level(base_path + ['authentication', 'radius']) if conf.exists(['acct-timeout']): sstp['radius_acct_tmo'] = conf.return_value(['acct-timeout']) if conf.exists(['max-try']): sstp['radius_max_try'] = conf.return_value(['max-try']) if conf.exists(['timeout']): sstp['radius_timeout'] = conf.return_value(['timeout']) if conf.exists(['nas-identifier']): sstp['radius_nas_id'] = conf.return_value(['nas-identifier']) if conf.exists(['nas-ip-address']): sstp['radius_nas_ip'] = conf.return_value(['nas-ip-address']) if conf.exists(['source-address']): sstp['radius_source_address'] = conf.return_value(['source-address']) # Dynamic Authorization Extensions (DOA)/Change Of Authentication (COA) if conf.exists(['dynamic-author']): dae = { 'port' : '', 'server' : '', 'key' : '' } if conf.exists(['dynamic-author', 'server']): dae['server'] = conf.return_value(['dynamic-author', 'server']) if conf.exists(['dynamic-author', 'port']): dae['port'] = conf.return_value(['dynamic-author', 'port']) if conf.exists(['dynamic-author', 'key']): dae['key'] = conf.return_value(['dynamic-author', 'key']) sstp['radius_dynamic_author'] = dae if conf.exists(['rate-limit', 'enable']): sstp['radius_shaper_attr'] = 'Filter-Id' c_attr = ['rate-limit', 'enable', 'attribute'] if conf.exists(c_attr): sstp['radius_shaper_attr'] = conf.return_value(c_attr) c_vendor = ['rate-limit', 'enable', 'vendor'] if conf.exists(c_vendor): sstp['radius_shaper_vendor'] = conf.return_value(c_vendor) # # authentication protocols conf.set_level(base_path + ['authentication']) if conf.exists(['protocols']): auth_mods = { 'pap': 'auth_pap', 'chap': 'auth_chap_md5', 'mschap': 'auth_mschap_v1', 'mschap-v2': 'auth_mschap_v2' } for proto in conf.return_values(['protocols']): sstp['auth_proto'].append(auth_mods[proto]) else: sstp['auth_proto'] = ['auth_mschap_v2'] # # read in SSL certs conf.set_level(base_path + ['ssl']) if conf.exists(['ca-cert-file']): sstp['ssl_ca'] = conf.return_value(['ca-cert-file']) if conf.exists(['cert-file']): sstp['ssl_cert'] = conf.return_value(['cert-file']) if conf.exists(['key-file']): sstp['ssl_key'] = conf.return_value(['key-file']) # # read in client ip pool settings conf.set_level(base_path + ['network-settings', 'client-ip-settings']) if conf.exists(['subnet']): sstp['client_ip_pool'] = conf.return_values(['subnet']) if conf.exists(['gateway-address']): sstp['client_gateway'] = conf.return_value(['gateway-address']) # # read in network settings conf.set_level(base_path + ['network-settings']) if conf.exists(['name-server']): sstp['dnsv4'] = conf.return_values(['name-server']) if conf.exists(['mtu']): sstp['mtu'] = conf.return_value(['mtu']) # # read in PPP stuff conf.set_level(base_path + ['ppp-settings']) if conf.exists('mppe'): sstp['ppp_mppe'] = conf.return_value('ppp-settings mppe') if conf.exists(['lcp-echo-failure']): sstp['ppp_echo_failure'] = conf.return_value(['lcp-echo-failure']) if conf.exists(['lcp-echo-interval']): sstp['ppp_echo_interval'] = conf.return_value(['lcp-echo-interval']) if conf.exists(['lcp-echo-timeout']): sstp['ppp_echo_timeout'] = conf.return_value(['lcp-echo-timeout']) return sstp def verify(sstp): if sstp is None: return None # vertify auth settings if sstp['auth_mode'] == 'local': if not sstp['local_users']: raise ConfigError('sstp-server authentication local-users required') for user in sstp['local_users']: if not user['password']: raise ConfigError(f"Password required for user {user['name']}") # if up/download is set, check that both have a value if user['upload'] and not user['download']: raise ConfigError(f"Download speed value required for user {user['name']}") if user['download'] and not user['upload']: raise ConfigError(f"Upload speed value required for user {user['name']}") if not sstp['client_ip_pool']: raise ConfigError("Client IP subnet required") if not sstp['client_gateway']: raise ConfigError("Client gateway IP address required") if len(sstp['dnsv4']) > 2: raise ConfigError("Only 2 DNS name-servers can be configured") if not sstp['ssl_ca'] or not sstp['ssl_cert'] or not sstp['ssl_key']: raise ConfigError('One or more SSL certificates missing') if not os.path.exists(sstp['ssl_ca']): raise ConfigError(f"CA cert file {sstp['ssl_ca']} does not exist") if not os.path.exists(sstp['ssl_cert']): raise ConfigError(f"SSL cert file {sstp['ssl_cert']} does not exist") if not os.path.exists(sstp['ssl_key']): raise ConfigError(f"SSL key file {sstp['ssl_key']} does not exist") if sstp['auth_mode'] == 'radius': if len(sstp['radius_server']) == 0: raise ConfigError("RADIUS authentication requires at least one server") for radius in sstp['radius_server']: if not radius['key']: raise ConfigError(f"Missing RADIUS secret for server {{ radius['key'] }}") def generate(sstp): if sstp is None: return None # accel-cmd reload doesn't work so any change results in a restart of the daemon tmpl = jinja2.Template(sstp_config, trim_blocks=True) config_text = tmpl.render(sstp) with open(sstp_conf, 'w') as f: f.write(config_text) if sstp['local_users']: tmpl = jinja2.Template(chap_secrets_conf, trim_blocks=True) config_text = tmpl.render(sstp) with open(chap_secrets, 'w') as f: f.write(config_text) os.chmod(chap_secrets, S_IRUSR | S_IWUSR | S_IRGRP) else: if os.path.exists(chap_secrets): os.unlink(chap_secrets) return sstp def apply(sstp): pid = 0 if os.path.isfile(pidfile): pid = 0 with open(pidfile, 'r') as f: pid = int(f.read()) if sstp is None: if pid_exists(pid): cmd = 'start-stop-daemon' cmd += ' --stop ' cmd += ' --quiet' cmd += ' --oknodo' cmd += ' --pidfile ' + pidfile subprocess_cmd(cmd) if os.path.exists(pidfile): os.remove(pidfile) return None if not pid_exists(pid): if os.path.exists(pidfile): os.remove(pidfile) cmd = 'start-stop-daemon' cmd += ' --start ' cmd += ' --quiet' cmd += ' --oknodo' cmd += ' --pidfile ' + pidfile cmd += ' --exec /usr/sbin/accel-pppd' # now pass arguments to accel-pppd binary cmd += ' --' cmd += ' -c ' + sstp_conf cmd += ' -p ' + pidfile cmd += ' -d' subprocess_cmd(cmd) chk_con() else: accel_cmd('restart') if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)