diff options
Diffstat (limited to 'src/conf_mode/vpn_sstp.py')
| -rwxr-xr-x | src/conf_mode/vpn_sstp.py | 545 |
1 files changed, 545 insertions, 0 deletions
diff --git a/src/conf_mode/vpn_sstp.py b/src/conf_mode/vpn_sstp.py new file mode 100755 index 000000000..a2e7c9327 --- /dev/null +++ b/src/conf_mode/vpn_sstp.py @@ -0,0 +1,545 @@ +#!/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' +ssl_cert_dir = r'/config/user-data/sstp' + +# config path creation +if not os.path.exists(sstp_cnf_dir): + os.makedirs(sstp_cnf_dir) + +if not os.path.exists(ssl_cert_dir): + os.makedirs(ssl_cert_dir) + +sstp_config = """### generated by vpn_sstp.py ### +[modules] +log_syslog +sstp +ippool +shaper +{% if auth_mode == 'local' %} +chap-secrets +{% elif auth_mode == 'radius' %} +radius +{% endif -%} + +{% 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=/config/user-data/sstp/{{ ssl_ca }} +ssl-pemfile=/config/user-data/sstp/{{ ssl_cert }} +ssl-keyfile=/config/user-data/sstp/{{ 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') + + ssl_path = ssl_cert_dir + '/' + if not os.path.exists(ssl_path + sstp['ssl_ca']): + ca = ssl_path + sstp['ssl_ca'] + raise ConfigError(f'CA cert file {ca} does not exist') + + if not os.path.exists(ssl_path + sstp['ssl_cert']): + cert = ssl_path + sstp['ssl_cert'] + raise ConfigError(f'SSL cert file {cert} does not exist') + + if not os.path.exists(ssl_path + sstp['ssl_key']): + key = ssl_path + sstp['ssl_key'] + raise ConfigError(f'SSL key file {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 --stop --quiet' + 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 --start --quiet' + 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) |