Merge remote-tracking branch 'kali/linux-firewall-root-py-2' into develop

5 files changed, 903 insertions, 10 deletions

diff --git a/pkg/linux/README b/pkg/linux/README
deleted file mode 100644
index 7410789b..00000000
--- a/pkg/linux/README
+++ /dev/null
@@ -1,4 +0,0 @@
-= Files =
-In GNU/Linux, we expect these files to be in place:
-
-resolv-update -> /etc/leap/resolv-update
diff --git a/pkg/linux/README.rst b/pkg/linux/README.rst
new file mode 100644
index 00000000..220565ff
--- /dev/null
+++ b/pkg/linux/README.rst
@@ -0,0 +1,10 @@
+Files 
+=====
+
+In GNU/Linux, we expect these files to be in place::
+
+ update-resolv-conf -> /etc/leap/update-resolv-conf
+ resolv-update -> /etc/leap/resolv-update
+
+ bitmask-root -> /usr/sbin/bitmask-root
+ polkit/se.leap.bitmask.policy -> /usr/share/polkit-1/actions/se.leap.bitmask.policy
diff --git a/pkg/linux/bitmask-root b/pkg/linux/bitmask-root
new file mode 100755
index 00000000..136fd6a4
--- /dev/null
+++ b/pkg/linux/bitmask-root
@@ -0,0 +1,829 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2014 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/>.
+#
+"""
+This is a privileged helper script for safely running certain commands as root.
+It should only be called by the Bitmask application.
+
+USAGE:
+  bitmask-root firewall stop
+  bitmask-root firewall start GATEWAY1 GATEWAY2 ...
+  bitmask-root openvpn stop
+  bitmask-root openvpn start CONFIG1 CONFIG1 ...
+
+All actions return exit code 0 for success, non-zero otherwise.
+
+The `openvpn start` action is special: it calls exec on openvpn and replaces
+the current process.
+"""
+# TODO should be tested with python3, which can be the default on some distro.
+from __future__ import print_function
+import atexit
+import os
+import re
+import signal
+import socket
+import subprocess
+import sys
+import time
+import traceback
+
+
+cmdcheck = subprocess.check_output
+
+##
+## CONSTANTS
+##
+
+SCRIPT = "bitmask-root"
+NAMESERVER = "10.42.0.1"
+BITMASK_CHAIN = "bitmask"
+
+IP = "/bin/ip"
+IPTABLES = "/sbin/iptables"
+IP6TABLES = "/sbin/ip6tables"
+
+RESOLVCONF_SYSTEM_BIN = "/sbin/resolvconf"
+RESOLVCONF_LEAP_BIN = "/usr/local/sbin/leap-resolvconf"
+
+OPENVPN_USER = "nobody"
+OPENVPN_GROUP = "nogroup"
+LEAPOPENVPN = "LEAPOPENVPN"
+OPENVPN_SYSTEM_BIN = "/usr/sbin/openvpn"  # Debian location
+OPENVPN_LEAP_BIN = "/usr/sbin/leap-openvpn"  # installed by bundle
+
+
+"""
+The path to the script to update resolv.conf
+"""
+# XXX We have to check if we have a valid resolvconf, and use
+# the old resolv-update if not.
+LEAP_UPDATE_RESOLVCONF_FILE = "/etc/leap/update-resolv-conf"
+LEAP_RESOLV_UPDATE = "/etc/leap/resolv-update"
+
+FIXED_FLAGS = [
+    "--setenv", "LEAPOPENVPN", "1",
+    "--nobind",
+    "--client",
+    "--dev", "tun",
+    "--tls-client",
+    "--remote-cert-tls", "server",
+    "--management-signal",
+    "--script-security", "1",
+    "--user", "nobody",
+    "--group", "nogroup",
+    "--remap-usr1", "SIGTERM",
+]
+
+ALLOWED_FLAGS = {
+    "--remote": ["IP", "NUMBER", "PROTO"],
+    "--tls-cipher": ["CIPHER"],
+    "--cipher": ["CIPHER"],
+    "--auth": ["CIPHER"],
+    "--management": ["DIR", "UNIXSOCKET"],
+    "--management-client-user": ["USER"],
+    "--cert": ["FILE"],
+    "--key": ["FILE"],
+    "--ca": ["FILE"]
+}
+
+PARAM_FORMATS = {
+    "NUMBER": lambda s: re.match("^\d+$", s),
+    "PROTO": lambda s: re.match("^(tcp|udp)$", s),
+    "IP": lambda s: is_valid_address(s),
+    "CIPHER": lambda s: re.match("^[A-Z0-9-]+$", s),
+    "USER": lambda s: re.match(
+        "^[a-zA-Z0-9_\.\@][a-zA-Z0-9_\-\.\@]*\$?$", s),  # IEEE Std 1003.1-2001
+    "FILE": lambda s: os.path.isfile(s),
+    "DIR": lambda s: os.path.isdir(os.path.split(s)[0]),
+    "UNIXSOCKET": lambda s: s == "unix"
+}
+
+
+DEBUG = os.getenv("DEBUG")
+TEST = os.getenv("TEST")
+
+if DEBUG:
+    import logging
+    formatter = logging.Formatter(
+        "%(asctime)s - %(name)s - %(levelname)s - %(message)s")
+    ch = logging.StreamHandler()
+    ch.setLevel(logging.DEBUG)
+    ch.setFormatter(formatter)
+    logger = logging.getLogger(__name__)
+    logger.setLevel(logging.DEBUG)
+    logger.addHandler(ch)
+
+##
+## UTILITY
+##
+
+
+def is_valid_address(value):
+    """
+    Validate that the passed ip is a valid IP address.
+
+    :param value: the value to be validated
+    :type value: str
+    :rtype: bool
+    """
+    try:
+        socket.inet_aton(value)
+        return True
+    except Exception:
+        print("%s: ERROR: MALFORMED IP: %s!" % (SCRIPT, value))
+        return False
+
+
+def has_system_resolvconf():
+    """
+    Return True if resolvconf is found in the system.
+
+    :rtype: bool
+    """
+    return os.path.isfile(RESOLVCONF)
+
+
+def has_valid_update_resolvconf():
+    """
+    Return True if a valid update-resolv-conf script is found in the system.
+
+    :rtype: bool
+    """
+    return os.path.isfile(LEAP_UPDATE_RESOLVCONF_FILE)
+
+
+def has_valid_leap_resolv_update():
+    """
+    Return True if a valid resolv-update script is found in the system.
+
+    :rtype: bool
+    """
+    return os.path.isfile(LEAP_RESOLV_UPDATE)
+
+
+def split_list(_list, regex):
+    """
+    Split a list based on a regex:
+    e.g. split_list(["xx", "yy", "x1", "zz"], "^x") => [["xx", "yy"], ["x1",
+    "zz"]]
+
+    :param _list: the list to be split.
+    :type _list: list
+    :param regex: the regex expression to filter with.
+    :type regex: str
+
+    :rtype: list
+    """
+    if not hasattr(regex, "match"):
+        regex = re.compile(regex)
+    result = []
+    i = 0
+    if not _list:
+        return result
+    while True:
+        if regex.match(_list[i]):
+            result.append([])
+            while True:
+                result[-1].append(_list[i])
+                i += 1
+                if i >= len(_list) or regex.match(_list[i]):
+                    break
+        else:
+            i += 1
+        if i >= len(_list):
+            break
+    return result
+
+
+def get_process_list():
+    """
+    Get a process list by reading `/proc` filesystem.
+
+    :return: a list of tuples, each containing pid and command string.
+    :rtype: tuple if lists
+    """
+    res = []
+    pids = [pid for pid in os.listdir('/proc') if pid.isdigit()]
+
+    for pid in pids:
+        try:
+            res.append((pid, open(
+                os.path.join(
+                    '/proc', pid, 'cmdline'), 'rb').read()))
+        except IOError:  # proc has already terminated
+            continue
+    return filter(None, res)
+
+
+class Daemon(object):
+    """
+    A generic daemon class.
+    """
+    def __init__(self, pidfile, stdin='/dev/null',
+                 stdout='/dev/null', stderr='/dev/null'):
+        self.stdin = stdin
+        self.stdout = stdout
+        self.stderr = stderr
+        self.pidfile = pidfile
+
+    def daemonize(self):
+        """
+        Do the UNIX double-fork magic, see Stevens' "Advanced
+        Programming in the UNIX Environment" for details (ISBN 0201563177)
+        http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16
+        """
+        try:
+            pid = os.fork()
+            if pid > 0:
+                # exit first parent
+                sys.exit(0)
+        except OSError, e:
+            sys.stderr.write(
+                "fork #1 failed: %d (%s)\n" % (e.errno, e.strerror))
+            sys.exit(1)
+
+        # decouple from parent environment
+        os.chdir("/")
+        os.setsid()
+        os.umask(0)
+
+        # do second fork
+        try:
+            pid = os.fork()
+            if pid > 0:
+                # exit from second parent
+                sys.exit(0)
+        except OSError, e:
+            sys.stderr.write(
+                "fork #2 failed: %d (%s)\n" % (e.errno, e.strerror))
+            sys.exit(1)
+
+        # redirect standard file descriptors
+        sys.stdout.flush()
+        sys.stderr.flush()
+        si = file(self.stdin, 'r')
+        so = file(self.stdout, 'a+')
+        se = file(self.stderr, 'a+', 0)
+        os.dup2(si.fileno(), sys.stdin.fileno())
+        os.dup2(so.fileno(), sys.stdout.fileno())
+        os.dup2(se.fileno(), sys.stderr.fileno())
+
+        # write pidfile
+        atexit.register(self.delpid)
+        pid = str(os.getpid())
+        file(self.pidfile, 'w+').write("%s\n" % pid)
+
+    def delpid(self):
+        """
+        Delete the pidfile.
+        """
+        os.remove(self.pidfile)
+
+    def start(self, *args):
+        """
+        Start the daemon.
+        """
+        # Check for a pidfile to see if the daemon already runs
+        try:
+            pf = file(self.pidfile, 'r')
+            pid = int(pf.read().strip())
+            pf.close()
+        except IOError:
+            pid = None
+
+        if pid:
+            message = "pidfile %s already exist. Daemon already running?\n"
+            sys.stderr.write(message % self.pidfile)
+            sys.exit(1)
+
+        # Start the daemon
+        self.daemonize()
+        self.run(args)
+
+    def stop(self):
+        """
+        Stop the daemon.
+        """
+        # Get the pid from the pidfile
+        try:
+            pf = file(self.pidfile, 'r')
+            pid = int(pf.read().strip())
+            pf.close()
+        except IOError:
+            pid = None
+
+        if not pid:
+            message = "pidfile %s does not exist. Daemon not running?\n"
+            sys.stderr.write(message % self.pidfile)
+            return  # not an error in a restart
+
+        # Try killing the daemon process
+        try:
+            while 1:
+                os.kill(pid, signal.SIGTERM)
+                time.sleep(0.1)
+        except OSError, err:
+            err = str(err)
+            if err.find("No such process") > 0:
+                if os.path.exists(self.pidfile):
+                    os.remove(self.pidfile)
+            else:
+                print(str(err))
+                sys.exit(1)
+
+    def restart(self):
+        """
+        Restart the daemon.
+        """
+        self.stop()
+        self.start()
+
+    def run(self):
+        """
+        This should  be overridden by derived classes.
+        """
+
+
+def run(command, *args, **options):
+    """
+    Run an external command.
+
+    Options:
+
+      `check`: If True, check the command's output. bail if non-zero. (the
+               default is true unless detach or input is true)
+      `exitcode`: like `check`, but return exitcode instead of bailing.
+      `detach`: If True, run in detached process.
+      `input`: If True, open command for writing stream to, returning the Popen
+               object.
+    """
+    parts = [command]
+    parts.extend(args)
+    if TEST or DEBUG:
+        print("%s run: %s " (SCRIPT, " ".join(parts)))
+
+    _check = options.get("check", True)
+    _detach = options.get("detach", False)
+    _input = options.get("input", False)
+    _exitcode = options.get("exitcode", False)
+
+    if not _check or _detach or _input:
+        if _input:
+            return subprocess.Popen(parts, stdin=subprocess.PIPE)
+        else:
+            # XXX ok with return None ??
+            subprocess.Popen(parts)
+    else:
+        try:
+            devnull = open('/dev/null', 'w')
+            subprocess.check_call(parts, stdout=devnull, stderr=devnull)
+            return 0
+        except subprocess.CalledProcessError as exc:
+            if DEBUG:
+                logger.exception(exc)
+            if _exitcode:
+                return exc.returncode
+            else:
+                bail("ERROR: Could not run %s: %s" % (exc.cmd, exc.output),
+                     exception=exc)
+
+
+def bail(msg=None, exception=None):
+    """
+    Abnormal exit.
+
+    :param msg: optional error message.
+    :type msg: str
+    """
+    if msg is not None:
+        print("%s: %s" % (SCRIPT, msg))
+    if exception is not None:
+        traceback.print_exc()
+    exit(1)
+
+##
+## OPENVPN
+##
+
+
+def get_openvpn_bin():
+    """
+    Return the path for either the system openvpn or the one the
+    bundle has put there.
+    """
+    if os.path.isfile(OPENVPN_SYSTEM_BIN):
+        return OPENVPN_SYSTEM_BIN
+
+    # the bundle option should be removed from the debian package.
+    if os.path.isfile(OPENVPN_LEAP_BIN):
+        return OPENVPN_LEAP_BIN
+
+
+def parse_openvpn_flags(args):
+    """
+    Take argument list from the command line and parse it, only allowing some
+    configuration flags.
+
+    :type args: list
+    """
+    result = []
+    try:
+        for flag in split_list(args, "^--"):
+            flag_name = flag[0]
+            if flag_name in ALLOWED_FLAGS:
+                result.append(flag_name)
+                required_params = ALLOWED_FLAGS[flag_name]
+                if required_params:
+                    flag_params = flag[1:]
+                    if len(flag_params) != len(required_params):
+                        print("%s: ERROR: not enough params for %s" %
+                              (SCRIPT, flag_name))
+                        return None
+                    for param, param_type in zip(flag_params, required_params):
+                        if PARAM_FORMATS[param_type](param):
+                            result.append(param)
+                        else:
+                            print("%s: ERROR: Bad argument %s" %
+                                  (SCRIPT, param))
+                            return None
+            else:
+                print("WARNING: unrecognized openvpn flag %s" % flag_name)
+        return result
+    except Exception as exc:
+        print("%s: ERROR PARSING FLAGS: %s" % (SCRIPT, exc))
+        if DEBUG:
+            logger.exception(exc)
+        return None
+
+
+def openvpn_start(args):
+    """
+    Launch openvpn, sanitizing input, and replacing the current process with
+    the openvpn process.
+
+    :param args: arguments to be passed to openvpn
+    :type args: list
+    """
+    openvpn_flags = parse_openvpn_flags(args)
+    if openvpn_flags:
+        OPENVPN = get_openvpn_bin()
+        flags = [OPENVPN] + FIXED_FLAGS + openvpn_flags
+        if DEBUG:
+            print("%s: running openvpn with flags:" % (SCRIPT,))
+            print(flags)
+        # note: first argument to command is ignored, but customarily set to
+        # the command.
+        os.execv(OPENVPN, flags)
+    else:
+        bail('ERROR: could not parse openvpn options')
+
+
+def openvpn_stop(args):
+    """
+    Stop the openvpn that has likely been launched by bitmask.
+
+    :param args: arguments to openvpn
+    :type args: list
+    """
+    plist = get_process_list()
+    OPENVPN_BIN = get_openvpn_bin()
+    found_leap_openvpn = filter(
+        lambda (p, s): s.startswith(OPENVPN_BIN) and LEAPOPENVPN in s,
+        plist)
+
+    if found_leap_openvpn:
+        pid = found_leap_openvpn[0][0]
+        os.kill(int(pid), signal.SIGTERM)
+
+##
+## DNS
+##
+
+
+def get_resolvconf_bin():
+    """
+    Return the path for either the system resolvconf or the one the
+    bundle has put there.
+    """
+    if os.path.isfile(RESOLVCONF_SYSTEM_BIN):
+        return RESOLVCONF_SYSTEM_BIN
+
+    # the bundle option should be removed from the debian package.
+    if os.path.isfile(RESOLVCONF_LEAP_BIN):
+        return RESOLVCONF_LEAP_BIN
+
+RESOLVCONF = get_resolvconf_bin()
+
+
+class NameserverSetter(Daemon):
+    """
+    A daemon that will add leap nameserver inside the tunnel
+    to the system `resolv.conf`
+    """
+
+    def run(self, *args):
+        """
+        Run when daemonized.
+        """
+        if args:
+            ip_address = args[0]
+            self.set_dns_nameserver(ip_address)
+
+    def set_dns_nameserver(self, ip_address):
+        """
+        Add the tunnel DNS server to `resolv.conf`
+
+        :param ip_address: the ip to add to `resolv.conf`
+        :type ip_address: str
+        """
+        if os.path.isfile(RESOLVCONF):
+            process = run(RESOLVCONF, "-a", "bitmask", input=True)
+            process.communicate("nameserver %s\n" % ip_address)
+        else:
+            bail("ERROR: package openresolv or resolvconf not installed.")
+
+nameserver_setter = NameserverSetter('/tmp/leap-dns-up.pid')
+
+
+class NameserverRestorer(Daemon):
+    """
+    A daemon that will restore the previous nameservers.
+    """
+
+    def run(self):
+        """
+        Run when daemonized.
+        """
+        self.restore_dns_nameserver()
+
+    def restore_dns_nameserver(self):
+        """
+        Remove tunnel DNS server from `resolv.conf`
+        """
+        if os.path.isfile(RESOLVCONF):
+            run(RESOLVCONF, "-d", "bitmask")
+        else:
+            print("%s: ERROR: package openresolv "
+                  "or resolvconf not installed." %
+                  (SCRIPT,))
+
+nameserver_restorer = NameserverRestorer('/tmp/leap-dns-down.pid')
+
+
+##
+## FIREWALL
+##
+
+
+def get_gateways(gateways):
+    """
+    Filter a passed sequence of gateways, returning only the valid ones.
+
+    :param gateways: a sequence of gateways to filter.
+    :type gateways: iterable
+    :rtype: iterable
+    """
+    result = filter(is_valid_address, gateways)
+    if not result:
+        bail("ERROR: No valid gateways specified")
+    else:
+        return result
+
+
+def get_default_device():
+    """
+    Retrieve the current default network device.
+
+    :rtype: str
+    """
+    routes = subprocess.check_output([IP, "route", "show"])
+    match = re.search("^default .*dev ([^\s]*) .*$", routes, flags=re.M)
+    if match.groups():
+        return match.group(1)
+    else:
+        bail("Could not find default device")
+
+
+def get_local_network_ipv4(device):
+    """
+    Get the local ipv4 addres for a given device.
+
+    :param device:
+    :type device: str
+    """
+    addresses = cmdcheck([IP, "-o", "address", "show", "dev", device])
+    match = re.search("^.*inet ([^ ]*) .*$", addresses, flags=re.M)
+    if match.groups():
+        return match.group(1)
+    else:
+        return None
+
+
+def get_local_network_ipv6(device):
+    """
+    Get the local ipv6 addres for a given device.
+
+    :param device:
+    :type device: str
+    """
+    addresses = cmdcheck([IP, "-o", "address", "show", "dev", device])
+    match = re.search("^.*inet6 ([^ ]*) .*$", addresses, flags=re.M)
+    if match.groups():
+        return match.group(1)
+    else:
+        return None
+
+
+def run_iptable_with_check(cmd, *args, **options):
+    """
+    Run an iptables command checking to see if it should:
+      for --insert: run only if rule does not already exist.
+      for --delete: run only if rule does exist.
+    other commands are run normally.
+    """
+    if "--insert" in args:
+        check_args = [arg.replace("--insert", "--check") for arg in args]
+        check_code = run(cmd, *check_args, exitcode=True)
+        if check_code != 0:
+            run(cmd, *args, **options)
+    elif "--delete" in args:
+        check_args = [arg.replace("--delete", "--check") for arg in args]
+        check_code = run(cmd, *check_args, exitcode=True)
+        if check_code == 0:
+            run(cmd, *args, **options)
+    else:
+        run(cmd, *args, **options)
+
+
+def iptables(*args, **options):
+    """
+    Run iptables4 and iptables6.
+    """
+    ip4tables(*args, **options)
+    ip6tables(*args, **options)
+
+
+def ip4tables(*args, **options):
+    """
+    Run iptables4 with checks.
+    """
+    run_iptable_with_check(IPTABLES, *args, **options)
+
+
+def ip6tables(*args, **options):
+    """
+    Run iptables6 with checks.
+    """
+    run_iptable_with_check(IP6TABLES, *args, **options)
+
+
+def ipv4_chain_exists(table):
+    """
+    Check if a given chain exists.
+
+    :param table: the table to check against
+    :type table: str
+    :rtype: bool
+    """
+    code = run(IPTABLES, "--list", table, "--numeric", exitcode=True)
+    return code == 0
+
+
+def ipv6_chain_exists(table):
+    """
+    Check if a given chain exists.
+
+    :param table: the table to check against
+    :type table: str
+    :rtype: bool
+    """
+    code = run(IP6TABLES, "--list", table, "--numeric", exitcode=True)
+    return code == 0
+
+
+def firewall_start(args):
+    """
+    Bring up the firewall.
+
+    :param args: list of gateways, to be sanitized.
+    :type args: list
+    """
+    default_device = get_default_device()
+    local_network_ipv4 = get_local_network_ipv4(default_device)
+    local_network_ipv6 = get_local_network_ipv6(default_device)
+    gateways = get_gateways(args)
+
+    # add custom chain "bitmask"
+    if not ipv4_chain_exists(BITMASK_CHAIN):
+        ip4tables("--new-chain", BITMASK_CHAIN)
+    if not ipv6_chain_exists(BITMASK_CHAIN):
+        ip6tables("--new-chain", BITMASK_CHAIN)
+    iptables("--insert", "OUTPUT", "--jump", BITMASK_CHAIN)
+
+    # reject everything
+    iptables("--insert", BITMASK_CHAIN, "-o", default_device,
+             "--jump", "REJECT")
+
+    # allow traffic to gateways
+    for gateway in gateways:
+        ip4tables("--insert", BITMASK_CHAIN, "--destination", gateway,
+                  "-o", default_device, "--jump", "ACCEPT")
+
+    # allow traffic to IPs on local network
+    if local_network_ipv4:
+        ip4tables("--insert", BITMASK_CHAIN,
+                  "--destination", local_network_ipv4, "-o", default_device,
+                  "--jump", "ACCEPT")
+    if local_network_ipv6:
+        ip6tables("--insert", BITMASK_CHAIN,
+                  "--destination", local_network_ipv6, "-o", default_device,
+                  "--jump", "ACCEPT")
+
+    # block DNS requests to anyone but the service provider or localhost
+    # when we actually route ipv6, we will need dns rules for it too
+    ip4tables("--insert", BITMASK_CHAIN, "--protocol", "udp", "--dport", "53",
+              "--jump", "REJECT")
+
+    for allowed_dns in [NAMESERVER, "127.0.0.1", "127.0.1.1"]:
+        ip4tables("--insert", BITMASK_CHAIN, "--protocol", "udp",
+                  "--dport", "53", "--destination", allowed_dns,
+                  "--jump", "ACCEPT")
+
+
+def firewall_stop():
+    """
+    Stop the firewall.
+    """
+    iptables("--delete", "OUTPUT", "--jump", BITMASK_CHAIN)
+    if ipv4_chain_exists(BITMASK_CHAIN):
+        ip4tables("--flush", BITMASK_CHAIN)
+        ip4tables("--delete-chain", BITMASK_CHAIN)
+    if ipv6_chain_exists(BITMASK_CHAIN):
+        ip6tables("--flush", BITMASK_CHAIN)
+        ip6tables("--delete-chain", BITMASK_CHAIN)
+
+##
+## MAIN
+##
+
+
+def main():
+    if len(sys.argv) >= 3:
+        command = "_".join(sys.argv[1:3])
+        args = sys.argv[3:]
+
+        if command == "openvpn_start":
+            openvpn_start(args)
+
+        elif command == "openvpn_stop":
+            openvpn_stop(args)
+
+        elif command == "firewall_start":
+            try:
+                firewall_start(args)
+                nameserver_setter.start(NAMESERVER)
+            except Exception as ex:
+                nameserver_restorer.start()
+                firewall_stop()
+                bail("ERROR: could not start firewall", ex)
+
+        elif command == "firewall_stop":
+            try:
+                firewall_stop()
+                nameserver_restorer.start()
+            except Exception as ex:
+                bail("ERROR: could not stop firewall", ex)
+
+        elif command == "firewall_isup":
+            if ipv4_chain_exists(BITMASK_CHAIN):
+                print("%s: INFO: bitmask firewall is up" % (SCRIPT,))
+            else:
+                bail("INFO: bitmask firewall is down")
+
+        else:
+            bail("ERROR: No such command")
+    else:
+        bail("ERROR: No such command")
+
+if __name__ == "__main__":
+    if DEBUG:
+        logger.debug(" ".join(sys.argv))
+    main()
+    print("%s: done" % (SCRIPT,))
+    exit(0)
diff --git a/pkg/linux/polkit/net.openvpn.gui.leap.policy b/pkg/linux/polkit/se.leap.bitmask.policy
index 50f991a3..c66f4701 100644
--- a/pkg/linux/polkit/net.openvpn.gui.leap.policy
+++ b/pkg/linux/polkit/se.leap.bitmask.policy
@@ -7,17 +7,17 @@
   <vendor>LEAP Project</vendor>
   <vendor_url>http://leap.se/</vendor_url>
 
-  <action id="net.openvpn,gui.leap.run-openvpn">
-    <description>Runs the openvpn binary</description>
-    <description xml:lang="es">Ejecuta el binario openvpn</description>
-    <message>OpenVPN needs that you authenticate to start</message>
-    <message xml:lang="es">OpenVPN necesita autorizacion para comenzar</message>
+  <action id="se.leap.bitmask.policy">
+    <description>Runs bitmask helper to launch firewall and openvpn</description>
+    <description xml:lang="es">Ejecuta el asistente de bitmask para lanzar el firewall y openvpn</description>
+    <message>Bitmask needs that you authenticate to start</message>
+    <message xml:lang="es">Bitmask necesita autorizacion para comenzar</message>
     <icon_name>package-x-generic</icon_name> 
     <defaults>
       <allow_any>yes</allow_any>
       <allow_inactive>yes</allow_inactive>
       <allow_active>yes</allow_active>
     </defaults>
-    <annotate key="org.freedesktop.policykit.exec.path">/usr/sbin/openvpn</annotate>
+    <annotate key="org.freedesktop.policykit.exec.path">/usr/sbin/bitmask-root</annotate>
   </action>
 </policyconfig>
diff --git a/pkg/linux/update-resolv-conf b/pkg/linux/update-resolv-conf
new file mode 100755
index 00000000..76c69413
--- /dev/null
+++ b/pkg/linux/update-resolv-conf
@@ -0,0 +1,58 @@
+#!/bin/bash
+# 
+# Parses DHCP options from openvpn to update resolv.conf
+# To use set as 'up' and 'down' script in your openvpn *.conf:
+# up /etc/leap/update-resolv-conf
+# down /etc/leap/update-resolv-conf
+#
+# Used snippets of resolvconf script by Thomas Hood and Chris Hanson.
+# Licensed under the GNU GPL.  See /usr/share/common-licenses/GPL. 
+# 
+# Example envs set from openvpn:
+#
+#     foreign_option_1='dhcp-option DNS 193.43.27.132'
+#     foreign_option_2='dhcp-option DNS 193.43.27.133'
+#     foreign_option_3='dhcp-option DOMAIN be.bnc.ch'
+#
+
+[ -x /sbin/resolvconf ] || exit 0
+[ "$script_type" ] || exit 0
+[ "$dev" ] || exit 0
+
+split_into_parts()
+{
+	part1="$1"
+	part2="$2"
+	part3="$3"
+}
+
+case "$script_type" in
+  up)
+	NMSRVRS=""
+	SRCHS=""
+	for optionvarname in ${!foreign_option_*} ; do
+		option="${!optionvarname}"
+		echo "$option"
+		split_into_parts $option
+		if [ "$part1" = "dhcp-option" ] ; then
+			if [ "$part2" = "DNS" ] ; then
+				NMSRVRS="${NMSRVRS:+$NMSRVRS }$part3"
+			elif [ "$part2" = "DOMAIN" ] ; then
+				SRCHS="${SRCHS:+$SRCHS }$part3"
+			fi
+		fi
+	done
+	R=""
+	[ "$SRCHS" ] && R="search $SRCHS
+"
+	for NS in $NMSRVRS ; do
+        	R="${R}nameserver $NS
+"
+	done
+	echo -n "$R" | /sbin/resolvconf -a "${dev}.openvpn"
+	;;
+  down)
+	/sbin/resolvconf -d "${dev}.openvpn"
+	;;
+esac
+