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# -*- coding: utf-8 -*-
# linux
# Copyright (C) 2013-2017 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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/>.
"""
Linux VPN launcher implementation.
"""
import commands
import os
import sys
from twisted.logger import Logger
from leap.bitmask.vpn.utils import first
from leap.bitmask.vpn.utils import get_path_prefix, force_eval
from leap.bitmask.vpn.privilege import LinuxPolicyChecker
from leap.bitmask.vpn.privilege import NoPkexecAvailable
from leap.bitmask.vpn.privilege import NoPolkitAuthAgentAvailable
from leap.bitmask.vpn.launcher import VPNLauncher
from leap.bitmask.vpn.launcher import VPNLauncherException
logger = Logger()
COM = commands
flags_STANDALONE = False
class EIPNoPolkitAuthAgentAvailable(VPNLauncherException):
pass
class EIPNoPkexecAvailable(VPNLauncherException):
pass
SYSTEM_CONFIG = "/etc/leap"
leapfile = lambda f: "%s/%s" % (SYSTEM_CONFIG, f)
class LinuxVPNLauncher(VPNLauncher):
# The following classes depend on force_eval to be called against
# the classes, to get the evaluation of the standalone flag on runtine.
# If we keep extending this kind of classes, we should abstract the
# handling of the STANDALONE flag in a base class
class BITMASK_ROOT(object):
def __call__(self):
return ("/usr/local/sbin/bitmask-root" if flags_STANDALONE else
"/usr/sbin/bitmask-root")
class OPENVPN_BIN_PATH(object):
def __call__(self):
return ("/usr/local/sbin/leap-openvpn" if flags_STANDALONE else
"/usr/sbin/openvpn")
class POLKIT_PATH(object):
def __call__(self):
# LinuxPolicyChecker will give us the right path if standalone.
return LinuxPolicyChecker.get_polkit_path()
OTHER_FILES = (POLKIT_PATH, BITMASK_ROOT, OPENVPN_BIN_PATH)
@classmethod
def get_vpn_command(kls, eipconfig, providerconfig, socket_host,
remotes, socket_port="unix", openvpn_verb=1):
"""
Returns the Linux implementation for the vpn launching command.
Might raise:
EIPNoPkexecAvailable,
EIPNoPolkitAuthAgentAvailable,
OpenVPNNotFoundException,
VPNLauncherException.
:param eipconfig: eip configuration object
:type eipconfig: EIPConfig
:param providerconfig: provider specific configuration
:type providerconfig: ProviderConfig
:param socket_host: either socket path (unix) or socket IP
:type socket_host: str
:param socket_port: either string "unix" if it's a unix socket,
or port otherwise
:type socket_port: str
:param openvpn_verb: the openvpn verbosity wanted
:type openvpn_verb: int
:return: A VPN command ready to be launched.
:rtype: list
"""
# we use `super` in order to send the class to use
command = super(LinuxVPNLauncher, kls).get_vpn_command(
eipconfig, providerconfig, socket_host, socket_port, remotes,
openvpn_verb)
command.insert(0, force_eval(kls.BITMASK_ROOT))
command.insert(1, "openvpn")
command.insert(2, "start")
policyChecker = LinuxPolicyChecker()
try:
pkexec = policyChecker.maybe_pkexec()
except NoPolkitAuthAgentAvailable:
raise EIPNoPolkitAuthAgentAvailable()
except NoPkexecAvailable:
raise EIPNoPkexecAvailable()
if pkexec:
command.insert(0, first(pkexec))
return command
@classmethod
def cmd_for_missing_scripts(kls, frompath):
"""
Returns a sh script that can copy the missing files.
:param frompath: The path where the helper files live
:type frompath: str
:rtype: str
"""
bin_paths = force_eval(
(LinuxVPNLauncher.POLKIT_PATH,
LinuxVPNLauncher.OPENVPN_BIN_PATH,
LinuxVPNLauncher.BITMASK_ROOT))
polkit_path, openvpn_bin_path, bitmask_root = bin_paths
# no system config for now
# sys_config = kls.SYSTEM_CONFIG
(polkit_file, openvpn_bin_file,
bitmask_root_file) = map(
lambda p: os.path.split(p)[-1],
bin_paths)
cmd = '#!/bin/sh\n'
cmd += 'mkdir -p /usr/local/sbin\n'
cmd += 'cp "%s" "%s"\n' % (os.path.join(frompath, polkit_file),
polkit_path)
cmd += 'chmod 644 "%s"\n' % (polkit_path, )
cmd += 'cp "%s" "%s"\n' % (os.path.join(frompath, bitmask_root_file),
bitmask_root)
cmd += 'chmod 744 "%s"\n' % (bitmask_root, )
if flags_STANDALONE:
cmd += 'cp "%s" "%s"\n' % (
os.path.join(frompath, openvpn_bin_file),
openvpn_bin_path)
cmd += 'chmod 744 "%s"\n' % (openvpn_bin_path, )
return cmd
@classmethod
def get_vpn_env(kls):
"""
Returns a dictionary with the custom env for the platform.
This is mainly used for setting LD_LIBRARY_PATH to the correct
path when distributing a standalone client
:rtype: dict
"""
ld_library_path = os.path.join(get_path_prefix(), "..", "lib")
ld_library_path.encode(sys.getfilesystemencoding())
return {
"LD_LIBRARY_PATH": ld_library_path
}
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