# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import logging
from autotest_lib.client.bin import utils
from autotest_lib.client.cros import network_chroot
from autotest_lib.client.common_lib.cros import site_eap_certs
class VPNServer(object):
"""Context enclosing the use of a VPN server instance."""
def __enter__(self):
self.start_server()
return self
def __exit__(self, exception, value, traceback):
logging.info('Log contents: %s', self.get_log_contents())
self.stop_server()
class L2TPIPSecVPNServer(VPNServer):
"""Implementation of an L2TP/IPSec VPN. Uses ipsec starter and xl2tpd."""
PRELOAD_MODULES = ('af_key', 'ah4', 'esp4', 'ipcomp', 'xfrm_user',
'xfrm4_tunnel')
ROOT_DIRECTORIES = ('etc/ipsec.d', 'etc/ipsec.d/cacerts',
'etc/ipsec.d/certs', 'etc/ipsec.d/crls',
'etc/ipsec.d/private', 'etc/ppp', 'etc/xl2tpd')
CHAP_USER = 'chapuser'
CHAP_SECRET = 'chapsecret'
IPSEC_COMMAND = '/usr/sbin/ipsec'
IPSEC_LOGFILE = 'var/log/charon.log'
IPSEC_PRESHARED_KEY = 'preshared-key'
IPSEC_CA_CERTIFICATE = 'etc/ipsec.d/cacerts/ca.cert'
IPSEC_SERVER_CERTIFICATE = 'etc/ipsec.d/certs/server.cert'
PPPD_PID_FILE = 'var/run/ppp0.pid'
XAUTH_USER = 'xauth_user'
XAUTH_PASSWORD = 'xauth_password'
XAUTH_SECONDARY_AUTHENTICATION_STANZA = 'rightauth2=xauth'
XL2TPD_COMMAND = '/usr/sbin/xl2tpd'
XL2TPD_CONFIG_FILE = 'etc/xl2tpd/xl2tpd.conf'
XL2TPD_PID_FILE = 'var/run/xl2tpd.pid'
SERVER_IP_ADDRESS = '192.168.1.99'
IPSEC_COMMON_CONFIGS = {
'etc/strongswan.conf' :
'charon {\n'
' filelog {\n'
' %(charon-logfile)s {\n'
' time_format = %%b %%e %%T\n'
' default = 3\n'
' }\n'
' }\n'
' install_routes = no\n'
' ignore_routing_tables = 0\n'
' routing_table = 0\n'
'}\n',
'etc/passwd' :
'root:x:0:0:root:/root:/bin/bash\n'
'ipsec:*:212:212::/dev/null:/bin/false\n',
'etc/group' :
'ipsec:x:212:\n',
XL2TPD_CONFIG_FILE :
'[global]\n'
'\n'
'[lns default]\n'
' ip range = 192.168.1.128-192.168.1.254\n'
' local ip = 192.168.1.99\n'
' require chap = yes\n'
' refuse pap = yes\n'
' require authentication = yes\n'
' name = LinuxVPNserver\n'
' ppp debug = yes\n'
' pppoptfile = /etc/ppp/options.xl2tpd\n'
' length bit = yes\n',
'etc/xl2tpd/l2tp-secrets' :
'* them l2tp-secret',
'etc/ppp/chap-secrets' :
'%(chap-user)s * %(chap-secret)s *',
'etc/ppp/options.xl2tpd' :
'ipcp-accept-local\n'
'ipcp-accept-remote\n'
'noccp\n'
'auth\n'
'crtscts\n'
'idle 1800\n'
'mtu 1410\n'
'mru 1410\n'
'nodefaultroute\n'
'debug\n'
'lock\n'
'proxyarp\n'
}
IPSEC_TYPED_CONFIGS = {
'psk': {
'etc/ipsec.conf' :
'config setup\n'
' charondebug="%(charon-debug-flags)s"\n'
'conn L2TP\n'
' keyexchange=ikev1\n'
' ike=aes128-sha1-modp2048!\n'
' esp=3des-sha1!\n'
' type=transport\n'
' authby=psk\n'
' %(xauth-stanza)s\n'
' rekey=no\n'
' left=%(local-ip)s\n'
' leftprotoport=17/1701\n'
' right=%%any\n'
' rightprotoport=17/%%any\n'
' auto=add\n',
'etc/ipsec.secrets' :
'%(local-ip)s %%any : PSK "%(preshared-key)s"\n'
'%(xauth-user)s : XAUTH "%(xauth-password)s"\n',
},
'cert': {
'etc/ipsec.conf' :
'config setup\n'
' charondebug="%(charon-debug-flags)s"\n'
'conn L2TP\n'
' keyexchange=ikev1\n'
' ike=aes128-sha1-modp2048!\n'
' esp=3des-sha1!\n'
' type=transport\n'
' left=%(local-ip)s\n'
' leftcert=server.cert\n'
' leftid="C=US, ST=California, L=Mountain View, '
'CN=chromelab-wifi-testbed-server.mtv.google.com"\n'
' leftprotoport=17/1701\n'
' right=%%any\n'
' rightca="C=US, ST=California, L=Mountain View, '
'CN=chromelab-wifi-testbed-root.mtv.google.com"\n'
' rightprotoport=17/%%any\n'
' auto=add\n',
'etc/ipsec.secrets' : ': RSA server.key ""\n',
IPSEC_SERVER_CERTIFICATE : site_eap_certs.server_cert_1,
IPSEC_CA_CERTIFICATE : site_eap_certs.ca_cert_1,
'etc/ipsec.d/private/server.key' :
site_eap_certs.server_private_key_1,
},
}
"""Implementation of an L2TP/IPSec server instance."""
def __init__(self, auth_type, interface_name, address, network_prefix,
perform_xauth_authentication=False):
self._auth_type = auth_type
self._chroot = network_chroot.NetworkChroot(interface_name,
address, network_prefix)
self._perform_xauth_authentication = perform_xauth_authentication
def start_server(self):
"""Start VPN server instance"""
if self._auth_type not in self.IPSEC_TYPED_CONFIGS:
raise RuntimeError('L2TP/IPSec type %s is not define' %
self._auth_type)
chroot = self._chroot
chroot.add_root_directories(self.ROOT_DIRECTORIES)
chroot.add_config_templates(self.IPSEC_COMMON_CONFIGS)
chroot.add_config_templates(self.IPSEC_TYPED_CONFIGS[self._auth_type])
chroot.add_config_values({
'chap-user': self.CHAP_USER,
'chap-secret': self.CHAP_SECRET,
'charon-debug-flags': 'dmn 2, mgr 2, ike 2, net 2',
'charon-logfile': self.IPSEC_LOGFILE,
'preshared-key': self.IPSEC_PRESHARED_KEY,
'xauth-user': self.XAUTH_USER,
'xauth-password': self.XAUTH_PASSWORD,
'xauth-stanza': self.XAUTH_SECONDARY_AUTHENTICATION_STANZA
if self._perform_xauth_authentication else '',
})
chroot.add_startup_command('%s start' % self.IPSEC_COMMAND)
chroot.add_startup_command('%s -c /%s -C /tmp/l2tpd.control' %
(self.XL2TPD_COMMAND,
self.XL2TPD_CONFIG_FILE))
self.preload_modules()
chroot.startup()
def stop_server(self):
"""Start VPN server instance"""
chroot = self._chroot
chroot.run([self.IPSEC_COMMAND, 'stop'], ignore_status=True)
chroot.kill_pid_file(self.XL2TPD_PID_FILE, missing_ok=True)
chroot.kill_pid_file(self.PPPD_PID_FILE, missing_ok=True)
chroot.shutdown()
def get_log_contents(self):
"""Return all logs related to the chroot."""
return self._chroot.get_log_contents()
def preload_modules(self):
"""Pre-load ipsec modules since they can't be loaded from chroot."""
for module in self.PRELOAD_MODULES:
utils.system('modprobe %s' % module)
class OpenVPNServer(VPNServer):
"""Implementation of an OpenVPN service."""
PRELOAD_MODULES = ('tun',)
ROOT_DIRECTORIES = ('etc/openvpn', 'etc/ssl')
CA_CERTIFICATE_FILE = 'etc/openvpn/ca.crt'
SERVER_CERTIFICATE_FILE = 'etc/openvpn/server.crt'
SERVER_KEY_FILE = 'etc/openvpn/server.key'
DIFFIE_HELLMAN_FILE = 'etc/openvpn/diffie-hellman.pem'
OPENVPN_COMMAND = '/usr/sbin/openvpn'
OPENVPN_CONFIG_FILE = 'etc/openvpn/openvpn.conf'
OPENVPN_PID_FILE = 'var/run/openvpn.pid'
OPENVPN_STATUS_FILE = 'tmp/openvpn.status'
AUTHENTICATION_SCRIPT = 'etc/openvpn_authentication_script.sh'
EXPECTED_AUTHENTICATION_FILE = 'etc/openvpn_expected_authentication.txt'
PASSWORD = 'password'
USERNAME = 'username'
SERVER_IP_ADDRESS = '10.11.12.1'
CONFIGURATION = {
'etc/ssl/blacklist' : '',
CA_CERTIFICATE_FILE : site_eap_certs.ca_cert_1,
SERVER_CERTIFICATE_FILE : site_eap_certs.server_cert_1,
SERVER_KEY_FILE : site_eap_certs.server_private_key_1,
DIFFIE_HELLMAN_FILE : site_eap_certs.dh1024_pem_key_1,
AUTHENTICATION_SCRIPT :
'#!/bin/bash\n'
'diff -q $1 %(expected-authentication-file)s\n',
EXPECTED_AUTHENTICATION_FILE : '%(username)s\n%(password)s\n',
OPENVPN_CONFIG_FILE :
'ca /%(ca-cert)s\n'
'cert /%(server-cert)s\n'
'dev tun\n'
'dh /%(diffie-hellman-params-file)s\n'
'keepalive 10 120\n'
'local %(local-ip)s\n'
'log /var/log/openvpn.log\n'
'ifconfig-pool-persist /tmp/ipp.txt\n'
'key /%(server-key)s\n'
'persist-key\n'
'persist-tun\n'
'port 1194\n'
'proto udp\n'
'server 10.11.12.0 255.255.255.0\n'
'status /%(status-file)s\n'
'verb 5\n'
'writepid /%(pid-file)s\n'
'%(optional-user-verification)s\n'
}
def __init__(self, interface_name, address, network_prefix,
perform_username_authentication=False):
self._chroot = network_chroot.NetworkChroot(interface_name,
address, network_prefix)
self._perform_username_authentication = perform_username_authentication
def start_server(self):
"""Start VPN server instance"""
chroot = self._chroot
chroot.add_root_directories(self.ROOT_DIRECTORIES)
# Create a configuration template from the key-value pairs.
chroot.add_config_templates(self.CONFIGURATION)
config_values = {
'ca-cert': self.CA_CERTIFICATE_FILE,
'diffie-hellman-params-file': self.DIFFIE_HELLMAN_FILE,
'expected-authentication-file': self.EXPECTED_AUTHENTICATION_FILE,
'optional-user-verification': '',
'password': self.PASSWORD,
'pid-file': self.OPENVPN_PID_FILE,
'server-cert': self.SERVER_CERTIFICATE_FILE,
'server-key': self.SERVER_KEY_FILE,
'status-file': self.OPENVPN_STATUS_FILE,
'username': self.USERNAME,
}
if self._perform_username_authentication:
config_values['optional-user-verification'] = (
'auth-user-pass-verify /%s via-file\nscript-security 2' %
self.AUTHENTICATION_SCRIPT)
chroot.add_config_values(config_values)
chroot.add_startup_command('chmod 755 %s' % self.AUTHENTICATION_SCRIPT)
chroot.add_startup_command('%s --config /%s &' %
(self.OPENVPN_COMMAND,
self.OPENVPN_CONFIG_FILE))
self.preload_modules()
chroot.startup()
def preload_modules(self):
"""Pre-load modules since they can't be loaded from chroot."""
for module in self.PRELOAD_MODULES:
utils.system('modprobe %s' % module)
def get_log_contents(self):
"""Return all logs related to the chroot."""
return self._chroot.get_log_contents()
def stop_server(self):
"""Start VPN server instance"""
chroot = self._chroot
chroot.kill_pid_file(self.OPENVPN_PID_FILE, missing_ok=True)
chroot.shutdown()