diff options
Diffstat (limited to 'src/leap/services/eip/vpnlaunchers.py')
| -rw-r--r-- | src/leap/services/eip/vpnlaunchers.py | 774 |
1 files changed, 774 insertions, 0 deletions
diff --git a/src/leap/services/eip/vpnlaunchers.py b/src/leap/services/eip/vpnlaunchers.py new file mode 100644 index 00000000..570a7893 --- /dev/null +++ b/src/leap/services/eip/vpnlaunchers.py @@ -0,0 +1,774 @@ +# -*- coding: utf-8 -*- +# vpnlaunchers.py +# Copyright (C) 2013 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/>. + +""" +Platform dependant VPN launchers +""" +import commands +import logging +import getpass +import os +import platform +import subprocess +import stat +try: + import grp +except ImportError: + pass # ignore, probably windows + +from abc import ABCMeta, abstractmethod +from functools import partial + +from leap.common.check import leap_assert, leap_assert_type +from leap.common.files import which +from leap.config.providerconfig import ProviderConfig +from leap.services.eip.eipconfig import EIPConfig, VPNGatewaySelector +from leap.util import first + +logger = logging.getLogger(__name__) + + +class VPNLauncherException(Exception): + pass + + +class OpenVPNNotFoundException(VPNLauncherException): + pass + + +class EIPNoPolkitAuthAgentAvailable(VPNLauncherException): + pass + + +class EIPNoPkexecAvailable(VPNLauncherException): + pass + + +class VPNLauncher: + """ + Abstract launcher class + """ + __metaclass__ = ABCMeta + + UPDOWN_FILES = None + OTHER_FILES = None + + @abstractmethod + def get_vpn_command(self, eipconfig=None, providerconfig=None, + socket_host=None, socket_port=None): + """ + Returns the platform dependant vpn launching command + + :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 + + :return: A VPN command ready to be launched + :rtype: list + """ + return [] + + @abstractmethod + def get_vpn_env(self, providerconfig): + """ + 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 + + :param providerconfig: provider specific configuration + :type providerconfig: ProviderConfig + + :rtype: dict + """ + return {} + + @classmethod + def missing_updown_scripts(kls): + """ + Returns what updown scripts are missing. + :rtype: list + """ + leap_assert(kls.UPDOWN_FILES is not None, + "Need to define UPDOWN_FILES for this particular " + "auncher before calling this method") + file_exist = partial(_has_updown_scripts, warn=False) + zipped = zip(kls.UPDOWN_FILES, map(file_exist, kls.UPDOWN_FILES)) + missing = filter(lambda (path, exists): exists is False, zipped) + return [path for path, exists in missing] + + @classmethod + def missing_other_files(kls): + """ + Returns what other important files are missing during startup. + Same as missing_updown_scripts but does not check for exec bit. + :rtype: list + """ + leap_assert(kls.UPDOWN_FILES is not None, + "Need to define OTHER_FILES for this particular " + "auncher before calling this method") + file_exist = partial(_has_other_files, warn=False) + zipped = zip(kls.OTHER_FILES, map(file_exist, kls.OTHER_FILES)) + missing = filter(lambda (path, exists): exists is False, zipped) + return [path for path, exists in missing] + + +def get_platform_launcher(): + launcher = globals()[platform.system() + "VPNLauncher"] + leap_assert(launcher, "Unimplemented platform launcher: %s" % + (platform.system(),)) + return launcher() + + +def _is_pkexec_in_system(): + """ + Checks the existence of the pkexec binary in system. + """ + pkexec_path = which('pkexec') + if len(pkexec_path) == 0: + return False + return True + + +def _has_updown_scripts(path, warn=True): + """ + Checks the existence of the up/down scripts and its + exec bit if applicable. + + :param path: the path to be checked + :type path: str + + :param warn: whether we should log the absence + :type warn: bool + + :rtype: bool + """ + is_file = os.path.isfile(path) + if warn and not is_file: + logger.error("Could not find up/down script %s. " + "Might produce DNS leaks." % (path,)) + + # XXX check if applies in win + is_exe = False + try: + is_exe = (stat.S_IXUSR & os.stat(path)[stat.ST_MODE] != 0) + except OSError as e: + logger.warn("%s" % (e,)) + if warn and not is_exe: + logger.error("Up/down script %s is not executable. " + "Might produce DNS leaks." % (path,)) + return is_file and is_exe + + +def _has_other_files(path, warn=True): + """ + Checks the existence of other important files. + + :param path: the path to be checked + :type path: str + + :param warn: whether we should log the absence + :type warn: bool + + :rtype: bool + """ + is_file = os.path.isfile(path) + if warn and not is_file: + logger.warning("Could not find file during checks: %s. " % ( + path,)) + return is_file + + +def _is_auth_agent_running(): + """ + Checks if a polkit daemon is running. + + :return: True if it's running, False if it's not. + :rtype: boolean + """ + ps = 'ps aux | grep polkit-%s-authentication-agent-1' + opts = (ps % case for case in ['[g]nome', '[k]de']) + is_running = map(lambda l: commands.getoutput(l), opts) + return any(is_running) + + +def _try_to_launch_agent(): + """ + Tries to launch a polkit daemon. + """ + opts = [ + "/usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1", + # XXX add kde thing here + ] + for cmd in opts: + try: + subprocess.Popen([cmd], shell=True) + except: + pass + + +class LinuxVPNLauncher(VPNLauncher): + """ + VPN launcher for the Linux platform + """ + + PKEXEC_BIN = 'pkexec' + OPENVPN_BIN = 'openvpn' + SYSTEM_CONFIG = "/etc/leap" + UP_DOWN_FILE = "resolv-update" + UP_DOWN_PATH = "%s/%s" % (SYSTEM_CONFIG, UP_DOWN_FILE) + + # We assume this is there by our openvpn dependency, and + # we will put it there on the bundle too. + # TODO adapt to the bundle path. + OPENVPN_DOWN_ROOT_BASE = "/usr/lib/openvpn/" + OPENVPN_DOWN_ROOT_FILE = "openvpn-plugin-down-root.so" + OPENVPN_DOWN_ROOT_PATH = "%s/%s" % ( + OPENVPN_DOWN_ROOT_BASE, + OPENVPN_DOWN_ROOT_FILE) + + POLKIT_BASE = "/usr/share/polkit-1/actions" + POLKIT_FILE = "net.openvpn.gui.leap.policy" + POLKIT_PATH = "%s/%s" % (POLKIT_BASE, POLKIT_FILE) + + UPDOWN_FILES = (UP_DOWN_PATH,) + OTHER_FILES = (POLKIT_PATH,) + + @classmethod + def cmd_for_missing_scripts(kls, frompath): + """ + Returns a command that can copy the missing scripts. + :rtype: str + """ + to = kls.SYSTEM_CONFIG + cmd = "#!/bin/sh\nset -e\nmkdir -p %s\ncp %s/%s %s\ncp %s/%s %s" % ( + to, + frompath, kls.UP_DOWN_FILE, to, + frompath, kls.POLKIT_FILE, kls.POLKIT_PATH) + return cmd + + @classmethod + def maybe_pkexec(kls): + """ + Checks whether pkexec is available in the system, and + returns the path if found. + + Might raise EIPNoPkexecAvailable or EIPNoPolkitAuthAgentAvailable + + :returns: a list of the paths where pkexec is to be found + :rtype: list + """ + if _is_pkexec_in_system(): + if not _is_auth_agent_running(): + _try_to_launch_agent() + if _is_auth_agent_running(): + pkexec_possibilities = which(kls.PKEXEC_BIN) + leap_assert(len(pkexec_possibilities) > 0, + "We couldn't find pkexec") + return pkexec_possibilities + else: + logger.warning("No polkit auth agent found. pkexec " + + "will use its own auth agent.") + raise EIPNoPolkitAuthAgentAvailable() + else: + logger.warning("System has no pkexec") + raise EIPNoPkexecAvailable() + + @classmethod + def maybe_down_plugin(kls): + """ + Returns the path of the openvpn down-root-plugin, searching first + in the relative path for the standalone bundle, and then in the system + path where the debian package puts it. + + :returns: the path where the plugin was found, or None + :rtype: str or None + """ + cwd = os.getcwd() + rel_path_in_bundle = os.path.join( + 'apps', 'eip', 'files', kls.OPENVPN_DOWN_ROOT_FILE) + abs_path_in_bundle = os.path.join(cwd, rel_path_in_bundle) + if os.path.isfile(abs_path_in_bundle): + return abs_path_in_bundle + abs_path_in_system = kls.OPENVPN_DOWN_ROOT_FILE + if os.path.isfile(abs_path_in_system): + return abs_path_in_system + + logger.warning("We could not find the down-root-plugin, so no updown " + "scripts will be run. DNS leaks are likely!") + return None + + def get_vpn_command(self, eipconfig=None, providerconfig=None, + socket_host=None, socket_port="unix"): + """ + Returns the platform dependant vpn launching command. It will + look for openvpn in the regular paths and algo in + path_prefix/apps/eip/ (in case standalone is set) + + Might raise VPNException. + + :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 + + :return: A VPN command ready to be launched + :rtype: list + """ + leap_assert(eipconfig, "We need an eip config") + leap_assert_type(eipconfig, EIPConfig) + leap_assert(providerconfig, "We need a provider config") + leap_assert_type(providerconfig, ProviderConfig) + leap_assert(socket_host, "We need a socket host!") + leap_assert(socket_port, "We need a socket port!") + + kwargs = {} + if ProviderConfig.standalone: + kwargs['path_extension'] = os.path.join( + providerconfig.get_path_prefix(), + "..", "apps", "eip") + + openvpn_possibilities = which(self.OPENVPN_BIN, **kwargs) + + if len(openvpn_possibilities) == 0: + raise OpenVPNNotFoundException() + + openvpn = first(openvpn_possibilities) + args = [] + + pkexec = self.maybe_pkexec() + if pkexec: + args.append(openvpn) + openvpn = first(pkexec) + + # TODO: handle verbosity + + gateway_selector = VPNGatewaySelector(eipconfig) + gateways = gateway_selector.get_gateways() + + logger.debug("Using gateways ips: {}".format(', '.join(gateways))) + + for gw in gateways: + args += ['--remote', gw, '1194', 'udp'] + + args += [ + '--client', + '--dev', 'tun', + '--persist-tun', + '--persist-key', + '--tls-client', + '--remote-cert-tls', + 'server' + ] + + openvpn_configuration = eipconfig.get_openvpn_configuration() + + for key, value in openvpn_configuration.items(): + args += ['--%s' % (key,), value] + + args += [ + '--user', getpass.getuser(), + '--group', grp.getgrgid(os.getgroups()[-1]).gr_name + ] + + if socket_port == "unix": # that's always the case for linux + args += [ + '--management-client-user', getpass.getuser() + ] + + args += [ + '--management-signal', + '--management', socket_host, socket_port, + '--script-security', '2' + ] + + plugin_path = self.maybe_down_plugin() + # If we do not have the down plugin neither in the bundle + # nor in the system, we do not do updown scripts. The alternative + # is leaving the user without the ability to restore dns and routes + # to its original state. + + if plugin_path and _has_updown_scripts(self.UP_DOWN_PATH): + args += [ + '--up', self.UP_DOWN_PATH, + '--down', self.UP_DOWN_PATH, + '--plugin', plugin_path, + '\'script_type=down %s\'' % self.UP_DOWN_PATH + ] + + args += [ + '--cert', eipconfig.get_client_cert_path(providerconfig), + '--key', eipconfig.get_client_cert_path(providerconfig), + '--ca', providerconfig.get_ca_cert_path() + ] + + logger.debug("Running VPN with command:") + logger.debug("%s %s" % (openvpn, " ".join(args))) + + return [openvpn] + args + + def get_vpn_env(self, providerconfig): + """ + 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 + + :param providerconfig: provider specific configuration + :type providerconfig: ProviderConfig + + :rtype: dict + """ + leap_assert(providerconfig, "We need a provider config") + leap_assert_type(providerconfig, ProviderConfig) + + return {"LD_LIBRARY_PATH": os.path.join( + providerconfig.get_path_prefix(), + "..", "lib")} + + +class DarwinVPNLauncher(VPNLauncher): + """ + VPN launcher for the Darwin Platform + """ + + COCOASUDO = "cocoasudo" + # XXX need magic translate for this string + SUDO_MSG = ("LEAP needs administrative privileges to run " + "Encrypted Internet.") + + INSTALL_PATH = "/Applications/LEAP\ Client.app" + OPENVPN_BIN = 'openvpn.leap' + OPENVPN_PATH = "%s/Contents/Resources/openvpn" % (INSTALL_PATH,) + + UP_SCRIPT = "%s/client.up.sh" % (OPENVPN_PATH,) + DOWN_SCRIPT = "%s/client.down.sh" % (OPENVPN_PATH,) + OPENVPN_DOWN_PLUGIN = '%s/openvpn-down-root.so' % (OPENVPN_PATH,) + + UPDOWN_FILES = (UP_SCRIPT, DOWN_SCRIPT, OPENVPN_DOWN_PLUGIN) + + @classmethod + def cmd_for_missing_scripts(kls, frompath): + """ + Returns a command that can copy the missing scripts. + :rtype: str + """ + to = kls.OPENVPN_PATH + cmd = "#!/bin/sh\nmkdir -p %s\ncp \"%s/\"* %s" % (to, frompath, to) + return cmd + + def get_cocoasudo_cmd(self): + """ + Returns a string with the cocoasudo command needed to run openvpn + as admin with a nice password prompt. The actual command needs to be + appended. + + :rtype: (str, list) + """ + iconpath = os.path.abspath(os.path.join( + os.getcwd(), + "../../../Resources/leap-client.tiff")) + has_icon = os.path.isfile(iconpath) + args = ["--icon=%s" % iconpath] if has_icon else [] + args.append("--prompt=%s" % (self.SUDO_MSG,)) + + return self.COCOASUDO, args + + def get_vpn_command(self, eipconfig=None, providerconfig=None, + socket_host=None, socket_port="unix"): + """ + Returns the platform dependant vpn launching command + + Might raise VPNException. + + :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 + + :return: A VPN command ready to be launched + :rtype: list + """ + leap_assert(eipconfig, "We need an eip config") + leap_assert_type(eipconfig, EIPConfig) + leap_assert(providerconfig, "We need a provider config") + leap_assert_type(providerconfig, ProviderConfig) + leap_assert(socket_host, "We need a socket host!") + leap_assert(socket_port, "We need a socket port!") + + kwargs = {} + if ProviderConfig.standalone: + kwargs['path_extension'] = os.path.join( + providerconfig.get_path_prefix(), + "..", "apps", "eip") + + openvpn_possibilities = which( + self.OPENVPN_BIN, + **kwargs) + if len(openvpn_possibilities) == 0: + raise OpenVPNNotFoundException() + + openvpn = first(openvpn_possibilities) + args = [openvpn] + + # TODO: handle verbosity + + gateway_selector = VPNGatewaySelector(eipconfig) + gateways = gateway_selector.get_gateways() + + logger.debug("Using gateways ips: {gw}".format( + gw=', '.join(gateways))) + + for gw in gateways: + args += ['--remote', gw, '1194', 'udp'] + + args += [ + '--client', + '--dev', 'tun', + '--persist-tun', + '--persist-key', + '--tls-client', + '--remote-cert-tls', + 'server' + ] + + openvpn_configuration = eipconfig.get_openvpn_configuration() + for key, value in openvpn_configuration.items(): + args += ['--%s' % (key,), value] + + user = getpass.getuser() + args += [ + '--user', user, + '--group', grp.getgrgid(os.getgroups()[-1]).gr_name + ] + + if socket_port == "unix": + args += [ + '--management-client-user', user + ] + + args += [ + '--management-signal', + '--management', socket_host, socket_port, + '--script-security', '2' + ] + + if _has_updown_scripts(self.UP_SCRIPT): + args += [ + '--up', self.UP_SCRIPT, + ] + + if _has_updown_scripts(self.DOWN_SCRIPT): + args += [ + '--down', self.DOWN_SCRIPT] + + # should have the down script too + if _has_updown_scripts(self.OPENVPN_DOWN_PLUGIN): + args += [ + '--plugin', self.OPENVPN_DOWN_PLUGIN, + '\'%s\'' % self.DOWN_SCRIPT + ] + + # we set user to be passed to the up/down scripts + args += [ + '--setenv', "LEAPUSER", "%s" % (user,)] + + args += [ + '--cert', eipconfig.get_client_cert_path(providerconfig), + '--key', eipconfig.get_client_cert_path(providerconfig), + '--ca', providerconfig.get_ca_cert_path() + ] + + command, cargs = self.get_cocoasudo_cmd() + cmd_args = cargs + args + + logger.debug("Running VPN with command:") + logger.debug("%s %s" % (command, " ".join(cmd_args))) + + return [command] + cmd_args + + def get_vpn_env(self, providerconfig): + """ + 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 + + :param providerconfig: provider specific configuration + :type providerconfig: ProviderConfig + + :rtype: dict + """ + return {"DYLD_LIBRARY_PATH": os.path.join( + providerconfig.get_path_prefix(), + "..", "lib")} + + +class WindowsVPNLauncher(VPNLauncher): + """ + VPN launcher for the Windows platform + """ + + OPENVPN_BIN = 'openvpn_leap.exe' + + # XXX UPDOWN_FILES ... we do not have updown files defined yet! + + def get_vpn_command(self, eipconfig=None, providerconfig=None, + socket_host=None, socket_port="9876"): + """ + Returns the platform dependant vpn launching command. It will + look for openvpn in the regular paths and algo in + path_prefix/apps/eip/ (in case standalone is set) + + Might raise VPNException. + + :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 + + :return: A VPN command ready to be launched + :rtype: list + """ + leap_assert(eipconfig, "We need an eip config") + leap_assert_type(eipconfig, EIPConfig) + leap_assert(providerconfig, "We need a provider config") + leap_assert_type(providerconfig, ProviderConfig) + leap_assert(socket_host, "We need a socket host!") + leap_assert(socket_port, "We need a socket port!") + leap_assert(socket_port != "unix", + "We cannot use unix sockets in windows!") + + openvpn_possibilities = which( + self.OPENVPN_BIN, + path_extension=os.path.join(providerconfig.get_path_prefix(), + "..", "apps", "eip")) + + if len(openvpn_possibilities) == 0: + raise OpenVPNNotFoundException() + + openvpn = first(openvpn_possibilities) + args = [] + + # TODO: handle verbosity + + gateway_selector = VPNGatewaySelector(eipconfig) + gateways = gateway_selector.get_gateways() + + logger.debug("Using gateways ips: {}".format(', '.join(gateways))) + + for gw in gateways: + args += ['--remote', gw, '1194', 'udp'] + + args += [ + '--client', + '--dev', 'tun', + '--persist-tun', + '--persist-key', + '--tls-client', + '--remote-cert-tls', + 'server' + ] + + openvpn_configuration = eipconfig.get_openvpn_configuration() + for key, value in openvpn_configuration.items(): + args += ['--%s' % (key,), value] + + args += [ + '--user', getpass.getuser(), + #'--group', grp.getgrgid(os.getgroups()[-1]).gr_name + ] + args += [ + '--management-signal', + '--management', socket_host, socket_port, + '--script-security', '2' + ] + args += [ + '--cert', eipconfig.get_client_cert_path(providerconfig), + '--key', eipconfig.get_client_cert_path(providerconfig), + '--ca', providerconfig.get_ca_cert_path() + ] + + logger.debug("Running VPN with command:") + logger.debug("%s %s" % (openvpn, " ".join(args))) + + return [openvpn] + args + + def get_vpn_env(self, providerconfig): + """ + 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 + + :param providerconfig: provider specific configuration + :type providerconfig: ProviderConfig + + :rtype: dict + """ + return {} + + +if __name__ == "__main__": + logger = logging.getLogger(name='leap') + logger.setLevel(logging.DEBUG) + console = logging.StreamHandler() + console.setLevel(logging.DEBUG) + formatter = logging.Formatter( + '%(asctime)s ' + '- %(name)s - %(levelname)s - %(message)s') + console.setFormatter(formatter) + logger.addHandler(console) + + try: + abs_launcher = VPNLauncher() + except Exception as e: + assert isinstance(e, TypeError), "Something went wrong" + print "Abstract Prefixer class is working as expected" + + vpnlauncher = get_platform_launcher() + + eipconfig = EIPConfig() + if eipconfig.load("leap/providers/bitmask.net/eip-service.json"): + provider = ProviderConfig() + if provider.load("leap/providers/bitmask.net/provider.json"): + vpnlauncher.get_vpn_command(eipconfig=eipconfig, + providerconfig=provider, + socket_host="/blah") |