/mandos/release : revision 302

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# "AvahiService" class, and some lines in "main".

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#

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# Everything else is

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#

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# This program is free software: you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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# along with this program. If not, see

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# <http://www.gnu.org/licenses/>.

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#

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# Contact the authors at <mandos@fukt.bsnet.se>.

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# Contact the authors at <mandos@recompile.se>.

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#

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import functools

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.3.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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version = "1.6.0"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = str("/dev/log")))

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syslogger.setFormatter(logging.Formatter

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('Mandos [%(process)d]: %(levelname)s:'

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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(ctypes.util.find_library("c"))

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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"Get an interface index the hard way, i.e. using fcntl()"

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SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

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with contextlib.closing(socket.socket()) as s:

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(str("16s16x"),

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interface))

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interface_index = struct.unpack(str("I"),

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ifreq[16:20])[0]

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return interface_index

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def initlogger(debug, level=logging.WARNING):

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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('Mandos [%(process)d]: %(levelname)s:'

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(asctime)s %(name)s'

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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"""Exception if encryption/decryption fails"""

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pass

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class PGPEngine(object):

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"""A simple class for OpenPGP symmetric encryption & decryption"""

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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self.tempdir = tempfile.mkdtemp(prefix="mandos-")

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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self.gnupg.options.extra_args.extend(['--force-mdc',

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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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def __exit__(self, exc_type, exc_value, traceback):

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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for root, dirs, files in os.walk(self.tempdir,

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topdown = False):

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for filename in files:

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os.remove(os.path.join(root, filename))

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for dirname in dirs:

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os.rmdir(os.path.join(root, dirname))

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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# Passphrase can not be empty and can not contain newlines or

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# NUL bytes. So we prefix it and hex encode it.

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return b"mandos" + binascii.hexlify(password)

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def encrypt(self, data, password):

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull, "w") as devnull:

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try:

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proc = self.gnupg.run(['--symmetric'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull, "w") as devnull:

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try:

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proc = self.gnupg.run(['--decrypt'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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class AvahiError(Exception):

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def __init__(self, value, *args, **kwargs):

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self, interface = avahi.IF_UNSPEC, name = None,

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servicetype = None, port = None, TXT = None,

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domain = "", host = "", max_renames = 32768,

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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"""Derived from the Avahi example code"""

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if self.rename_count >= self.max_renames:

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = unicode(self.server.GetAlternativeServiceName(self.name))

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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logger.info("Changing Zeroconf service name to %r ...",

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self.name)

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syslogger.setFormatter(logging.Formatter

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('Mandos (%s) [%%(process)d]:'

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' %%(levelname)s: %%(message)s'

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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logger.critical("DBusException: %s", error)

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logger.critical("D-Bus Exception", exc_info=error)

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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"""Derived from the Avahi example code"""

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match.remove()

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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"""Derived from the Avahi example code"""

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self.remove()

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew(),

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follow_name_owner_changes=True),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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if self.group is None:

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew()),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self .entry_group_state_changed))

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'StateChanged', self.entry_group_state_changed))

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logger.debug("Adding Zeroconf service '%s' of type '%s' ...",

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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"""Derived from the Avahi example code"""

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logger.debug("Avahi entry group state change: %i", state)

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elif state == avahi.ENTRY_GROUP_FAILURE:

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logger.critical("Avahi: Error in group state changed %s",

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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raise AvahiGroupError("State changed: {0!s}"

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.format(error))

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def cleanup(self):

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"""Derived from the Avahi example code"""

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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pass

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self.group = None

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self.remove()

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def server_state_changed(self, state, error=None):

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"""Derived from the Avahi example code"""

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logger.debug("Avahi server state change: %i", state)

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avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

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if state in bad_states:

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if bad_states[state]:

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logger.error(bad_states[state])

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self.remove()

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if bad_states[state] is not None:

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if error is None:

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logger.error(bad_states[state])

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else:

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logger.error(bad_states[state] + ": %r", error)

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self.cleanup()

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elif state == avahi.SERVER_RUNNING:

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self.add()

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else:

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logger.debug("Unknown state: %r", state)

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if error is None:

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logger.debug("Unknown state: %r", state)

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else:

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logger.debug("Unknown state: %r: %r", state, error)

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def activate(self):

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"""Derived from the Avahi example code"""

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if self.server is None:

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self.server_state_changed(self.server.GetState())

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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"""Add the new name to the syslog messages"""

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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('Mandos ({0}) [%(process)d]:'

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' %(levelname)s: %(message)s'

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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return ((td.days * 24 * 60 * 60 * 1000)

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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"""A representation of a client host served by this server.

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Attributes:

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_approved: bool(); 'None' if not yet approved/disapproved

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approved: bool(); 'None' if not yet approved/disapproved

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approval_delay: datetime.timedelta(); Time to wait for approval

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approval_duration: datetime.timedelta(); Duration of one approval

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checker: subprocess.Popen(); a running checker process used

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instance %(name)s can be used in the command.

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checker_initiator_tag: a gobject event source tag, or None

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created: datetime.datetime(); (UTC) object creation

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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disable_hook: If set, called by disable() as disable_hook(self)

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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fingerprint: string (40 or 32 hexadecimal digits); used to

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interval: datetime.timedelta(); How often to start a new checker

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last_approval_request: datetime.datetime(); (UTC) or None

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last_checked_ok: datetime.datetime(); (UTC) or None

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last_enabled: datetime.datetime(); (UTC)

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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last_enabled: datetime.datetime(); (UTC) or None

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name: string; from the config file, used in log messages and

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D-Bus identifiers

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secret: bytestring; sent verbatim (over TLS) to client

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timeout: datetime.timedelta(); How long from last_checked_ok

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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expires: datetime.datetime(); time (UTC) when a client will be

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disabled, or None

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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"created", "enabled", "fingerprint",

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"host", "interval", "last_checked_ok",

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"created", "enabled", "expires",

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"fingerprint", "host", "interval",

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"last_approval_request", "last_checked_ok",

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"last_enabled", "name", "timeout")

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@staticmethod

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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return ((td.days * 24 * 60 * 60 * 1000)

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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client_defaults = { "timeout": "5m",

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"extended_timeout": "15m",

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"interval": "2m",

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"checker": "fping -q -- %%(host)s",

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"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return self._timedelta_to_milliseconds(self.timeout)

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return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return self._timedelta_to_milliseconds(self.interval)

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return timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return self._timedelta_to_milliseconds(self.approval_delay)

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def __init__(self, name = None, disable_hook=None, config=None):

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"""Note: the 'checker' key in 'config' sets the

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'checker_command' attribute and *not* the 'checker'

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attribute."""

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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"""Construct a new dict of client settings of this form:

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{ client_name: {setting_name: value, ...}, ...}

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with exceptions for any special settings as defined above.

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NOTE: Must be a pure function. Must return the same result

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value given the same arguments.

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"""

483

settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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client["host"] = section["host"]

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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client["enabled"] = config.getboolean(client_name,

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"enabled")

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client["fingerprint"] = (section["fingerprint"].upper()

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.replace(" ", ""))

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if "secret" in section:

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client["secret"] = section["secret"].decode("base64")

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elif "secfile" in section:

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with open(os.path.expanduser(os.path.expandvars

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(section["secfile"])),

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"rb") as secfile:

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client["secret"] = secfile.read()

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else:

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raise TypeError("No secret or secfile for section {0}"

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.format(section))

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client["timeout"] = string_to_delta(section["timeout"])

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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client["interval"] = string_to_delta(section["interval"])

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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client["checker_command"] = section["checker"]

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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def __init__(self, settings, name = None):

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self.name = name

323

if config is None:

324

config = {}

524

# adding all client settings

525

for setting, value in settings.iteritems():

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setattr(self, setting, value)

527

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if self.enabled:

529

if not hasattr(self, "last_enabled"):

530

self.last_enabled = datetime.datetime.utcnow()

531

if not hasattr(self, "expires"):

532

self.expires = (datetime.datetime.utcnow()

533

+ self.timeout)

534

else:

535

self.last_enabled = None

536

self.expires = None

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logger.debug("Creating client %r", self.name)

326

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# Uppercase and remove spaces from fingerprint for later

327

540

# comparison purposes with return value from the fingerprint()

328

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# function

329

self.fingerprint = (config["fingerprint"].upper()

330

.replace(" ", ""))

331

542

logger.debug(" Fingerprint: %s", self.fingerprint)

332

if "secret" in config:

333

self.secret = config["secret"].decode("base64")

334

elif "secfile" in config:

335

with open(os.path.expanduser(os.path.expandvars

336

(config["secfile"])),

337

"rb") as secfile:

338

self.secret = secfile.read()

339

else:

340

raise TypeError("No secret or secfile for client %s"

341

% self.name)

342

self.host = config.get("host", "")

343

self.created = datetime.datetime.utcnow()

344

self.enabled = False

345

self.last_approval_request = None

346

self.last_enabled = None

347

self.last_checked_ok = None

348

self.timeout = string_to_delta(config["timeout"])

349

self.interval = string_to_delta(config["interval"])

350

self.disable_hook = disable_hook

543

self.created = settings.get("created",

544

datetime.datetime.utcnow())

545

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# attributes specific for this server instance

351

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self.checker = None

352

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self.checker_initiator_tag = None

353

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self.disable_initiator_tag = None

354

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self.checker_callback_tag = None

355

self.checker_command = config["checker"]

356

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self.current_checker_command = None

357

self.last_connect = None

358

self._approved = None

359

self.approved_by_default = config.get("approved_by_default",

360

True)

552

self.approved = None

361

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self.approvals_pending = 0

362

self.approval_delay = string_to_delta(

363

config["approval_delay"])

364

self.approval_duration = string_to_delta(

365

config["approval_duration"])

366

self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())

554

self.changedstate = (multiprocessing_manager

555

.Condition(multiprocessing_manager

556

.Lock()))

557

self.client_structure = [attr for attr in

558

self.__dict__.iterkeys()

559

if not attr.startswith("_")]

560

self.client_structure.append("client_structure")

561

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for name, t in inspect.getmembers(type(self),

563

lambda obj:

564

isinstance(obj,

565

property)):

566

if not name.startswith("_"):

567

self.client_structure.append(name)

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# Send notice to process children that client state has changed

368

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def send_changedstate(self):

369

self.changedstate.acquire()

370

self.changedstate.notify_all()

371

self.changedstate.release()

372

571

with self.changedstate:

572

self.changedstate.notify_all()

573

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def enable(self):

374

575

"""Start this client's checker and timeout hooks"""

375

576

if getattr(self, "enabled", False):

376

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# Already enabled

377

578

return

378

self.send_changedstate()

579

self.expires = datetime.datetime.utcnow() + self.timeout

580

self.enabled = True

379

581

self.last_enabled = datetime.datetime.utcnow()

582

self.init_checker()

583

self.send_changedstate()

584

585

def disable(self, quiet=True):

586

"""Disable this client."""

587

if not getattr(self, "enabled", False):

588

return False

589

if not quiet:

590

logger.info("Disabling client %s", self.name)

591

if getattr(self, "disable_initiator_tag", None) is not None:

592

gobject.source_remove(self.disable_initiator_tag)

593

self.disable_initiator_tag = None

594

self.expires = None

595

if getattr(self, "checker_initiator_tag", None) is not None:

596

gobject.source_remove(self.checker_initiator_tag)

597

self.checker_initiator_tag = None

598

self.stop_checker()

599

self.enabled = False

600

if not quiet:

601

self.send_changedstate()

602

# Do not run this again if called by a gobject.timeout_add

603

return False

604

605

def __del__(self):

606

self.disable()

607

608

def init_checker(self):

380

609

# Schedule a new checker to be started an 'interval' from now,

381

610

# and every interval from then on.

611

if self.checker_initiator_tag is not None:

612

gobject.source_remove(self.checker_initiator_tag)

382

613

self.checker_initiator_tag = (gobject.timeout_add

383

614

(self.interval_milliseconds(),

384

615

self.start_checker))

385

616

# Schedule a disable() when 'timeout' has passed

617

if self.disable_initiator_tag is not None:

618

gobject.source_remove(self.disable_initiator_tag)

386

619

self.disable_initiator_tag = (gobject.timeout_add

387

620

(self.timeout_milliseconds(),

388

621

self.disable))

389

self.enabled = True

390

622

# Also start a new checker *right now*.

391

623

self.start_checker()

392

624

393

def disable(self, quiet=True):

394

"""Disable this client."""

395

if not getattr(self, "enabled", False):

396

return False

397

if not quiet:

398

self.send_changedstate()

399

if not quiet:

400

logger.info("Disabling client %s", self.name)

401

if getattr(self, "disable_initiator_tag", False):

402

gobject.source_remove(self.disable_initiator_tag)

403

self.disable_initiator_tag = None

404

if getattr(self, "checker_initiator_tag", False):

405

gobject.source_remove(self.checker_initiator_tag)

406

self.checker_initiator_tag = None

407

self.stop_checker()

408

if self.disable_hook:

409

self.disable_hook(self)

410

self.enabled = False

411

# Do not run this again if called by a gobject.timeout_add

412

return False

413

414

def __del__(self):

415

self.disable_hook = None

416

self.disable()

417

418

625

def checker_callback(self, pid, condition, command):

419

626

"""The checker has completed, so take appropriate actions."""

420

627

self.checker_callback_tag = None

421

628

self.checker = None

422

629

if os.WIFEXITED(condition):

423

exitstatus = os.WEXITSTATUS(condition)

424

if exitstatus == 0:

630

self.last_checker_status = os.WEXITSTATUS(condition)

631

if self.last_checker_status == 0:

425

632

logger.info("Checker for %(name)s succeeded",

426

633

vars(self))

427

634

self.checked_ok()

429

636

logger.info("Checker for %(name)s failed",

430

637

vars(self))

431

638

else:

639

self.last_checker_status = -1

432

640

logger.warning("Checker for %(name)s crashed?",

433

641

vars(self))

434

642

435

643

def checked_ok(self):

436

"""Bump up the timeout for this client.

437

438

This should only be called when the client has been seen,

439

alive and well.

440

"""

644

"""Assert that the client has been seen, alive and well."""

441

645

self.last_checked_ok = datetime.datetime.utcnow()

442

gobject.source_remove(self.disable_initiator_tag)

443

self.disable_initiator_tag = (gobject.timeout_add

444

(self.timeout_milliseconds(),

445

self.disable))

646

self.last_checker_status = 0

647

self.bump_timeout()

648

649

def bump_timeout(self, timeout=None):

650

"""Bump up the timeout for this client."""

651

if timeout is None:

652

timeout = self.timeout

653

if self.disable_initiator_tag is not None:

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

656

if getattr(self, "enabled", False):

657

self.disable_initiator_tag = (gobject.timeout_add

658

(timedelta_to_milliseconds

659

(timeout), self.disable))

660

self.expires = datetime.datetime.utcnow() + timeout

446

661

447

662

def need_approval(self):

448

663

self.last_approval_request = datetime.datetime.utcnow()

453

668

If a checker already exists, leave it running and do

454

669

nothing."""

455

670

# The reason for not killing a running checker is that if we

456

# did that, then if a checker (for some reason) started

457

# running slowly and taking more than 'interval' time, the

458

# client would inevitably timeout, since no checker would get

459

# a chance to run to completion. If we instead leave running

671

# did that, and if a checker (for some reason) started running

672

# slowly and taking more than 'interval' time, then the client

673

# would inevitably timeout, since no checker would get a

674

# chance to run to completion. If we instead leave running

460

675

# checkers alone, the checker would have to take more time

461

676

# than 'timeout' for the client to be disabled, which is as it

462

677

# should be.

476

691

self.current_checker_command)

477

692

# Start a new checker if needed

478

693

if self.checker is None:

694

# Escape attributes for the shell

695

escaped_attrs = dict(

696

(attr, re.escape(unicode(getattr(self, attr))))

697

for attr in

698

self.runtime_expansions)

479

699

try:

480

# In case checker_command has exactly one % operator

481

command = self.checker_command % self.host

482

except TypeError:

483

# Escape attributes for the shell

484

escaped_attrs = dict(

485

(attr,

486

re.escape(unicode(str(getattr(self, attr, "")),

487

errors=

488

'replace')))

489

for attr in

490

self.runtime_expansions)

491

492

try:

493

command = self.checker_command % escaped_attrs

494

except TypeError as error:

495

logger.error('Could not format string "%s":'

496

' %s', self.checker_command, error)

497

return True # Try again later

700

command = self.checker_command % escaped_attrs

701

except TypeError as error:

702

logger.error('Could not format string "%s"',

703

self.checker_command, exc_info=error)

704

return True # Try again later

498

705

self.current_checker_command = command

499

706

try:

500

707

logger.info("Starting checker %r for %s",

506

713

self.checker = subprocess.Popen(command,

507

714

close_fds=True,

508

715

shell=True, cwd="/")

509

self.checker_callback_tag = (gobject.child_watch_add

510

(self.checker.pid,

511

self.checker_callback,

512

data=command))

513

# The checker may have completed before the gobject

514

# watch was added. Check for this.

515

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

516

if pid:

517

gobject.source_remove(self.checker_callback_tag)

518

self.checker_callback(pid, status, command)

519

716

except OSError as error:

520

logger.error("Failed to start subprocess: %s",

521

error)

717

logger.error("Failed to start subprocess",

718

exc_info=error)

719

self.checker_callback_tag = (gobject.child_watch_add

720

(self.checker.pid,

721

self.checker_callback,

722

data=command))

723

# The checker may have completed before the gobject

724

# watch was added. Check for this.

725

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

726

if pid:

727

gobject.source_remove(self.checker_callback_tag)

728

self.checker_callback(pid, status, command)

522

729

# Re-run this periodically if run by gobject.timeout_add

523

730

return True

524

731

531

738

return

532

739

logger.debug("Stopping checker for %(name)s", vars(self))

533

740

try:

534

os.kill(self.checker.pid, signal.SIGTERM)

741

self.checker.terminate()

535

742

#time.sleep(0.5)

536

743

#if self.checker.poll() is None:

537

# os.kill(self.checker.pid, signal.SIGKILL)

744

# self.checker.kill()

538

745

except OSError as error:

539

746

if error.errno != errno.ESRCH: # No such process

540

747

raise

541

748

self.checker = None

542

749

750

543

751

def dbus_service_property(dbus_interface, signature="v",

544

752

access="readwrite", byte_arrays=False):

545

753

"""Decorators for marking methods of a DBusObjectWithProperties to

556

764

# "Set" method, so we fail early here:

557

765

if byte_arrays and signature != "ay":

558

766

raise ValueError("Byte arrays not supported for non-'ay'"

559

" signature %r" % signature)

767

" signature {0!r}".format(signature))

560

768

def decorator(func):

561

769

func._dbus_is_property = True

562

770

func._dbus_interface = dbus_interface

570

778

return decorator

571

779

572

780

781

def dbus_interface_annotations(dbus_interface):

782

"""Decorator for marking functions returning interface annotations

783

784

Usage:

785

786

@dbus_interface_annotations("org.example.Interface")

787

def _foo(self): # Function name does not matter

788

return {"org.freedesktop.DBus.Deprecated": "true",

789

"org.freedesktop.DBus.Property.EmitsChangedSignal":

790

"false"}

791

"""

792

def decorator(func):

793

func._dbus_is_interface = True

794

func._dbus_interface = dbus_interface

795

func._dbus_name = dbus_interface

796

return func

797

return decorator

798

799

800

def dbus_annotations(annotations):

801

"""Decorator to annotate D-Bus methods, signals or properties

802

Usage:

803

804

@dbus_service_property("org.example.Interface", signature="b",

805

access="r")

806

@dbus_annotations({{"org.freedesktop.DBus.Deprecated": "true",

807

"org.freedesktop.DBus.Property."

808

"EmitsChangedSignal": "false"})

809

def Property_dbus_property(self):

810

return dbus.Boolean(False)

811

"""

812

def decorator(func):

813

func._dbus_annotations = annotations

814

return func

815

return decorator

816

817

573

818

class DBusPropertyException(dbus.exceptions.DBusException):

574

819

"""A base class for D-Bus property-related exceptions

575

820

"""

591

836

592

837

class DBusObjectWithProperties(dbus.service.Object):

593

838

"""A D-Bus object with properties.

594

839

595

840

Classes inheriting from this can use the dbus_service_property

596

841

decorator to expose methods as D-Bus properties. It exposes the

597

842

standard Get(), Set(), and GetAll() methods on the D-Bus.

598

843

"""

599

844

600

845

@staticmethod

601

def _is_dbus_property(obj):

602

return getattr(obj, "_dbus_is_property", False)

846

def _is_dbus_thing(thing):

847

"""Returns a function testing if an attribute is a D-Bus thing

848

849

If called like _is_dbus_thing("method") it returns a function

850

suitable for use as predicate to inspect.getmembers().

851

"""

852

return lambda obj: getattr(obj, "_dbus_is_{0}".format(thing),

853

False)

603

854

604

def _get_all_dbus_properties(self):

855

def _get_all_dbus_things(self, thing):

605

856

"""Returns a generator of (name, attribute) pairs

606

857

"""

607

return ((prop._dbus_name, prop)

608

for name, prop in

609

inspect.getmembers(self, self._is_dbus_property))

858

return ((getattr(athing.__get__(self), "_dbus_name",

859

name),

860

athing.__get__(self))

861

for cls in self.__class__.__mro__

862

for name, athing in

863

inspect.getmembers(cls,

864

self._is_dbus_thing(thing)))

610

865

611

866

def _get_dbus_property(self, interface_name, property_name):

612

867

"""Returns a bound method if one exists which is a D-Bus

613

868

property with the specified name and interface.

614

869

"""

615

for name in (property_name,

616

property_name + "_dbus_property"):

617

prop = getattr(self, name, None)

618

if (prop is None

619

or not self._is_dbus_property(prop)

620

or prop._dbus_name != property_name

621

or (interface_name and prop._dbus_interface

622

and interface_name != prop._dbus_interface)):

623

continue

624

return prop

870

for cls in self.__class__.__mro__:

871

for name, value in (inspect.getmembers

872

(cls,

873

self._is_dbus_thing("property"))):

874

if (value._dbus_name == property_name

875

and value._dbus_interface == interface_name):

876

return value.__get__(self)

877

625

878

# No such property

626

879

raise DBusPropertyNotFound(self.dbus_object_path + ":"

627

880

+ interface_name + "."

652

905

# signatures other than "ay".

653

906

if prop._dbus_signature != "ay":

654

907

raise ValueError

655

value = dbus.ByteArray(''.join(unichr(byte)

656

for byte in value))

908

value = dbus.ByteArray(b''.join(chr(byte)

909

for byte in value))

657

910

prop(value)

658

911

659

912

@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",

661

914

def GetAll(self, interface_name):

662

915

"""Standard D-Bus property GetAll() method, see D-Bus

663

916

standard.

664

917

665

918

Note: Will not include properties with access="write".

666

919

"""

667

all = {}

668

for name, prop in self._get_all_dbus_properties():

920

properties = {}

921

for name, prop in self._get_all_dbus_things("property"):

669

922

if (interface_name

670

923

and interface_name != prop._dbus_interface):

671

924

# Interface non-empty but did not match

675

928

continue

676

929

value = prop()

677

930

if not hasattr(value, "variant_level"):

678

all[name] = value

931

properties[name] = value

679

932

continue

680

all[name] = type(value)(value, variant_level=

681

value.variant_level+1)

682

return dbus.Dictionary(all, signature="sv")

933

properties[name] = type(value)(value, variant_level=

934

value.variant_level+1)

935

return dbus.Dictionary(properties, signature="sv")

683

936

684

937

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

685

938

out_signature="s",

686

939

path_keyword='object_path',

687

940

connection_keyword='connection')

688

941

def Introspect(self, object_path, connection):

689

"""Standard D-Bus method, overloaded to insert property tags.

942

"""Overloading of standard D-Bus method.

943

944

Inserts property tags and interface annotation tags.

690

945

"""

691

946

xmlstring = dbus.service.Object.Introspect(self, object_path,

692

947

connection)

699

954

e.setAttribute("access", prop._dbus_access)

700

955

return e

701

956

for if_tag in document.getElementsByTagName("interface"):

957

# Add property tags

702

958

for tag in (make_tag(document, name, prop)

703

959

for name, prop

704

in self._get_all_dbus_properties()

960

in self._get_all_dbus_things("property")

705

961

if prop._dbus_interface

706

962

== if_tag.getAttribute("name")):

707

963

if_tag.appendChild(tag)

964

# Add annotation tags

965

for typ in ("method", "signal", "property"):

966

for tag in if_tag.getElementsByTagName(typ):

967

annots = dict()

968

for name, prop in (self.

969

_get_all_dbus_things(typ)):

970

if (name == tag.getAttribute("name")

971

and prop._dbus_interface

972

== if_tag.getAttribute("name")):

973

annots.update(getattr

974

(prop,

975

"_dbus_annotations",

976

{}))

977

for name, value in annots.iteritems():

978

ann_tag = document.createElement(

979

"annotation")

980

ann_tag.setAttribute("name", name)

981

ann_tag.setAttribute("value", value)

982

tag.appendChild(ann_tag)

983

# Add interface annotation tags

984

for annotation, value in dict(

985

itertools.chain.from_iterable(

986

annotations().iteritems()

987

for name, annotations in

988

self._get_all_dbus_things("interface")

989

if name == if_tag.getAttribute("name")

990

)).iteritems():

991

ann_tag = document.createElement("annotation")

992

ann_tag.setAttribute("name", annotation)

993

ann_tag.setAttribute("value", value)

994

if_tag.appendChild(ann_tag)

708

995

# Add the names to the return values for the

709

996

# "org.freedesktop.DBus.Properties" methods

710

997

if (if_tag.getAttribute("name")

725

1012

except (AttributeError, xml.dom.DOMException,

726

1013

xml.parsers.expat.ExpatError) as error:

727

1014

logger.error("Failed to override Introspection method",

728

error)

1015

exc_info=error)

729

1016

return xmlstring

730

1017

731

1018

1019

def datetime_to_dbus(dt, variant_level=0):

1020

"""Convert a UTC datetime.datetime() to a D-Bus type."""

1021

if dt is None:

1022

return dbus.String("", variant_level = variant_level)

1023

return dbus.String(dt.isoformat(),

1024

variant_level=variant_level)

1025

1026

1027

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1028

"""A class decorator; applied to a subclass of

1029

dbus.service.Object, it will add alternate D-Bus attributes with

1030

interface names according to the "alt_interface_names" mapping.

1031

Usage:

1032

1033

@alternate_dbus_interfaces({"org.example.Interface":

1034

"net.example.AlternateInterface"})

1035

class SampleDBusObject(dbus.service.Object):

1036

@dbus.service.method("org.example.Interface")

1037

def SampleDBusMethod():

1038

pass

1039

1040

The above "SampleDBusMethod" on "SampleDBusObject" will be

1041

reachable via two interfaces: "org.example.Interface" and

1042

"net.example.AlternateInterface", the latter of which will have

1043

its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to

1044

"true", unless "deprecate" is passed with a False value.

1045

1046

This works for methods and signals, and also for D-Bus properties

1047

(from DBusObjectWithProperties) and interfaces (from the

1048

dbus_interface_annotations decorator).

1049

"""

1050

def wrapper(cls):

1051

for orig_interface_name, alt_interface_name in (

1052

alt_interface_names.iteritems()):

1053

attr = {}

1054

interface_names = set()

1055

# Go though all attributes of the class

1056

for attrname, attribute in inspect.getmembers(cls):

1057

# Ignore non-D-Bus attributes, and D-Bus attributes

1058

# with the wrong interface name

1059

if (not hasattr(attribute, "_dbus_interface")

1060

or not attribute._dbus_interface

1061

.startswith(orig_interface_name)):

1062

continue

1063

# Create an alternate D-Bus interface name based on

1064

# the current name

1065

alt_interface = (attribute._dbus_interface

1066

.replace(orig_interface_name,

1067

alt_interface_name))

1068

interface_names.add(alt_interface)

1069

# Is this a D-Bus signal?

1070

if getattr(attribute, "_dbus_is_signal", False):

1071

# Extract the original non-method function by

1072

# black magic

1073

nonmethod_func = (dict(

1074

zip(attribute.func_code.co_freevars,

1075

attribute.__closure__))["func"]

1076

.cell_contents)

1077

# Create a new, but exactly alike, function

1078

# object, and decorate it to be a new D-Bus signal

1079

# with the alternate D-Bus interface name

1080

new_function = (dbus.service.signal

1081

(alt_interface,

1082

attribute._dbus_signature)

1083

(types.FunctionType(

1084

nonmethod_func.func_code,

1085

nonmethod_func.func_globals,

1086

nonmethod_func.func_name,

1087

nonmethod_func.func_defaults,

1088

nonmethod_func.func_closure)))

1089

# Copy annotations, if any

1090

try:

1091

new_function._dbus_annotations = (

1092

dict(attribute._dbus_annotations))

1093

except AttributeError:

1094

pass

1095

# Define a creator of a function to call both the

1096

# original and alternate functions, so both the

1097

# original and alternate signals gets sent when

1098

# the function is called

1099

def fixscope(func1, func2):

1100

"""This function is a scope container to pass

1101

func1 and func2 to the "call_both" function

1102

outside of its arguments"""

1103

def call_both(*args, **kwargs):

1104

"""This function will emit two D-Bus

1105

signals by calling func1 and func2"""

1106

func1(*args, **kwargs)

1107

func2(*args, **kwargs)

1108

return call_both

1109

# Create the "call_both" function and add it to

1110

# the class

1111

attr[attrname] = fixscope(attribute, new_function)

1112

# Is this a D-Bus method?

1113

elif getattr(attribute, "_dbus_is_method", False):

1114

# Create a new, but exactly alike, function

1115

# object. Decorate it to be a new D-Bus method

1116

# with the alternate D-Bus interface name. Add it

1117

# to the class.

1118

attr[attrname] = (dbus.service.method

1119

(alt_interface,

1120

attribute._dbus_in_signature,

1121

attribute._dbus_out_signature)

1122

(types.FunctionType

1123

(attribute.func_code,

1124

attribute.func_globals,

1125

attribute.func_name,

1126

attribute.func_defaults,

1127

attribute.func_closure)))

1128

# Copy annotations, if any

1129

try:

1130

attr[attrname]._dbus_annotations = (

1131

dict(attribute._dbus_annotations))

1132

except AttributeError:

1133

pass

1134

# Is this a D-Bus property?

1135

elif getattr(attribute, "_dbus_is_property", False):

1136

# Create a new, but exactly alike, function

1137

# object, and decorate it to be a new D-Bus

1138

# property with the alternate D-Bus interface

1139

# name. Add it to the class.

1140

attr[attrname] = (dbus_service_property

1141

(alt_interface,

1142

attribute._dbus_signature,

1143

attribute._dbus_access,

1144

attribute

1145

._dbus_get_args_options

1146

["byte_arrays"])

1147

(types.FunctionType

1148

(attribute.func_code,

1149

attribute.func_globals,

1150

attribute.func_name,

1151

attribute.func_defaults,

1152

attribute.func_closure)))

1153

# Copy annotations, if any

1154

try:

1155

attr[attrname]._dbus_annotations = (

1156

dict(attribute._dbus_annotations))

1157

except AttributeError:

1158

pass

1159

# Is this a D-Bus interface?

1160

elif getattr(attribute, "_dbus_is_interface", False):

1161

# Create a new, but exactly alike, function

1162

# object. Decorate it to be a new D-Bus interface

1163

# with the alternate D-Bus interface name. Add it

1164

# to the class.

1165

attr[attrname] = (dbus_interface_annotations

1166

(alt_interface)

1167

(types.FunctionType

1168

(attribute.func_code,

1169

attribute.func_globals,

1170

attribute.func_name,

1171

attribute.func_defaults,

1172

attribute.func_closure)))

1173

if deprecate:

1174

# Deprecate all alternate interfaces

1175

iname="_AlternateDBusNames_interface_annotation{0}"

1176

for interface_name in interface_names:

1177

@dbus_interface_annotations(interface_name)

1178

def func(self):

1179

return { "org.freedesktop.DBus.Deprecated":

1180

"true" }

1181

# Find an unused name

1182

for aname in (iname.format(i)

1183

for i in itertools.count()):

1184

if aname not in attr:

1185

attr[aname] = func

1186

break

1187

if interface_names:

1188

# Replace the class with a new subclass of it with

1189

# methods, signals, etc. as created above.

1190

cls = type(b"{0}Alternate".format(cls.__name__),

1191

(cls,), attr)

1192

return cls

1193

return wrapper

1194

1195

1196

@alternate_dbus_interfaces({"se.recompile.Mandos":

1197

"se.bsnet.fukt.Mandos"})

732

1198

class ClientDBus(Client, DBusObjectWithProperties):

733

1199

"""A Client class using D-Bus

734

1200

743

1209

# dbus.service.Object doesn't use super(), so we can't either.

744

1210

745

1211

def __init__(self, bus = None, *args, **kwargs):

746

self._approvals_pending = 0

747

1212

self.bus = bus

748

1213

Client.__init__(self, *args, **kwargs)

749

1214

# Only now, when this client is initialized, can it show up on

755

1220

("/clients/" + client_object_name))

756

1221

DBusObjectWithProperties.__init__(self, self.bus,

757

1222

self.dbus_object_path)

758

759

def _get_approvals_pending(self):

760

return self._approvals_pending

761

def _set_approvals_pending(self, value):

762

old_value = self._approvals_pending

763

self._approvals_pending = value

764

bval = bool(value)

765

if (hasattr(self, "dbus_object_path")

766

and bval is not bool(old_value)):

767

dbus_bool = dbus.Boolean(bval, variant_level=1)

768

self.PropertyChanged(dbus.String("ApprovalPending"),

769

dbus_bool)

770

771

approvals_pending = property(_get_approvals_pending,

772

_set_approvals_pending)

773

del _get_approvals_pending, _set_approvals_pending

774

775

@staticmethod

776

def _datetime_to_dbus(dt, variant_level=0):

777

"""Convert a UTC datetime.datetime() to a D-Bus type."""

778

return dbus.String(dt.isoformat(),

779

variant_level=variant_level)

780

781

def enable(self):

782

oldstate = getattr(self, "enabled", False)

783

r = Client.enable(self)

784

if oldstate != self.enabled:

785

# Emit D-Bus signals

786

self.PropertyChanged(dbus.String("Enabled"),

787

dbus.Boolean(True, variant_level=1))

788

self.PropertyChanged(

789

dbus.String("LastEnabled"),

790

self._datetime_to_dbus(self.last_enabled,

791

variant_level=1))

792

return r

793

794

def disable(self, quiet = False):

795

oldstate = getattr(self, "enabled", False)

796

r = Client.disable(self, quiet=quiet)

797

if not quiet and oldstate != self.enabled:

798

# Emit D-Bus signal

799

self.PropertyChanged(dbus.String("Enabled"),

800

dbus.Boolean(False, variant_level=1))

801

return r

1223

1224

def notifychangeproperty(transform_func,

1225

dbus_name, type_func=lambda x: x,

1226

variant_level=1):

1227

""" Modify a variable so that it's a property which announces

1228

its changes to DBus.

1229

1230

transform_fun: Function that takes a value and a variant_level

1231

and transforms it to a D-Bus type.

1232

dbus_name: D-Bus name of the variable

1233

type_func: Function that transform the value before sending it

1234

to the D-Bus. Default: no transform

1235

variant_level: D-Bus variant level. Default: 1

1236

"""

1237

attrname = "_{0}".format(dbus_name)

1238

def setter(self, value):

1239

if hasattr(self, "dbus_object_path"):

1240

if (not hasattr(self, attrname) or

1241

type_func(getattr(self, attrname, None))

1242

!= type_func(value)):

1243

dbus_value = transform_func(type_func(value),

1244

variant_level

1245

=variant_level)

1246

self.PropertyChanged(dbus.String(dbus_name),

1247

dbus_value)

1248

setattr(self, attrname, value)

1249

1250

return property(lambda self: getattr(self, attrname), setter)

1251

1252

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1253

approvals_pending = notifychangeproperty(dbus.Boolean,

1254

"ApprovalPending",

1255

type_func = bool)

1256

enabled = notifychangeproperty(dbus.Boolean, "Enabled")

1257

last_enabled = notifychangeproperty(datetime_to_dbus,

1258

"LastEnabled")

1259

checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",

1260

type_func = lambda checker:

1261

checker is not None)

1262

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1263

"LastCheckedOK")

1264

last_checker_status = notifychangeproperty(dbus.Int16,

1265

"LastCheckerStatus")

1266

last_approval_request = notifychangeproperty(

1267

datetime_to_dbus, "LastApprovalRequest")

1268

approved_by_default = notifychangeproperty(dbus.Boolean,

1269

"ApprovedByDefault")

1270

approval_delay = notifychangeproperty(dbus.UInt64,

1271

"ApprovalDelay",

1272

type_func =

1273

timedelta_to_milliseconds)

1274

approval_duration = notifychangeproperty(

1275

dbus.UInt64, "ApprovalDuration",

1276

type_func = timedelta_to_milliseconds)

1277

host = notifychangeproperty(dbus.String, "Host")

1278

timeout = notifychangeproperty(dbus.UInt64, "Timeout",

1279

type_func =

1280

timedelta_to_milliseconds)

1281

extended_timeout = notifychangeproperty(

1282

dbus.UInt64, "ExtendedTimeout",

1283

type_func = timedelta_to_milliseconds)

1284

interval = notifychangeproperty(dbus.UInt64,

1285

"Interval",

1286

type_func =

1287

timedelta_to_milliseconds)

1288

checker_command = notifychangeproperty(dbus.String, "Checker")

1289

1290

del notifychangeproperty

802

1291

803

1292

def __del__(self, *args, **kwargs):

804

1293

try:

813

1302

*args, **kwargs):

814

1303

self.checker_callback_tag = None

815

1304

self.checker = None

816

# Emit D-Bus signal

817

self.PropertyChanged(dbus.String("CheckerRunning"),

818

dbus.Boolean(False, variant_level=1))

819

1305

if os.WIFEXITED(condition):

820

1306

exitstatus = os.WEXITSTATUS(condition)

821

1307

# Emit D-Bus signal

831

1317

return Client.checker_callback(self, pid, condition, command,

832

1318

*args, **kwargs)

833

1319

834

def checked_ok(self, *args, **kwargs):

835

Client.checked_ok(self, *args, **kwargs)

836

# Emit D-Bus signal

837

self.PropertyChanged(

838

dbus.String("LastCheckedOK"),

839

(self._datetime_to_dbus(self.last_checked_ok,

840

variant_level=1)))

841

842

def need_approval(self, *args, **kwargs):

843

r = Client.need_approval(self, *args, **kwargs)

844

# Emit D-Bus signal

845

self.PropertyChanged(

846

dbus.String("LastApprovalRequest"),

847

(self._datetime_to_dbus(self.last_approval_request,

848

variant_level=1)))

849

return r

850

851

1320

def start_checker(self, *args, **kwargs):

852

1321

old_checker = self.checker

853

1322

if self.checker is not None:

860

1329

and old_checker_pid != self.checker.pid):

861

1330

# Emit D-Bus signal

862

1331

self.CheckerStarted(self.current_checker_command)

863

self.PropertyChanged(

864

dbus.String("CheckerRunning"),

865

dbus.Boolean(True, variant_level=1))

866

1332

return r

867

1333

868

def stop_checker(self, *args, **kwargs):

869

old_checker = getattr(self, "checker", None)

870

r = Client.stop_checker(self, *args, **kwargs)

871

if (old_checker is not None

872

and getattr(self, "checker", None) is None):

873

self.PropertyChanged(dbus.String("CheckerRunning"),

874

dbus.Boolean(False, variant_level=1))

875

return r

876

877

1334

def _reset_approved(self):

878

self._approved = None

1335

self.approved = None

879

1336

return False

880

1337

881

1338

def approve(self, value=True):

882

self.send_changedstate()

883

self._approved = value

884

gobject.timeout_add(self._timedelta_to_milliseconds

1339

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

885

1341

(self.approval_duration),

886

1342

self._reset_approved)

887

1343

self.send_changedstate()

888

1344

889

1345

## D-Bus methods, signals & properties

890

_interface = "se.bsnet.fukt.Mandos.Client"

1346

_interface = "se.recompile.Mandos.Client"

1347

1348

## Interfaces

1349

1350

@dbus_interface_annotations(_interface)

1351

def _foo(self):

1352

return { "org.freedesktop.DBus.Property.EmitsChangedSignal":

1353

"false"}

891

1354

892

1355

## Signals

893

1356

979

1442

if value is None: # get

980

1443

return dbus.Boolean(self.approved_by_default)

981

1444

self.approved_by_default = bool(value)

982

# Emit D-Bus signal

983

self.PropertyChanged(dbus.String("ApprovedByDefault"),

984

dbus.Boolean(value, variant_level=1))

985

1445

986

1446

# ApprovalDelay - property

987

1447

@dbus_service_property(_interface, signature="t",

990

1450

if value is None: # get

991

1451

return dbus.UInt64(self.approval_delay_milliseconds())

992

1452

self.approval_delay = datetime.timedelta(0, 0, 0, value)

993

# Emit D-Bus signal

994

self.PropertyChanged(dbus.String("ApprovalDelay"),

995

dbus.UInt64(value, variant_level=1))

996

1453

997

1454

# ApprovalDuration - property

998

1455

@dbus_service_property(_interface, signature="t",

999

1456

access="readwrite")

1000

1457

def ApprovalDuration_dbus_property(self, value=None):

1001

1458

if value is None: # get

1002

return dbus.UInt64(self._timedelta_to_milliseconds(

1459

return dbus.UInt64(timedelta_to_milliseconds(

1003

1460

self.approval_duration))

1004

1461

self.approval_duration = datetime.timedelta(0, 0, 0, value)

1005

# Emit D-Bus signal

1006

self.PropertyChanged(dbus.String("ApprovalDuration"),

1007

dbus.UInt64(value, variant_level=1))

1008

1462

1009

1463

# Name - property

1010

1464

@dbus_service_property(_interface, signature="s", access="read")

1022

1476

def Host_dbus_property(self, value=None):

1023

1477

if value is None: # get

1024

1478

return dbus.String(self.host)

1025

self.host = value

1026

# Emit D-Bus signal

1027

self.PropertyChanged(dbus.String("Host"),

1028

dbus.String(value, variant_level=1))

1479

self.host = unicode(value)

1029

1480

1030

1481

# Created - property

1031

1482

@dbus_service_property(_interface, signature="s", access="read")

1032

1483

def Created_dbus_property(self):

1033

return dbus.String(self._datetime_to_dbus(self.created))

1484

return datetime_to_dbus(self.created)

1034

1485

1035

1486

# LastEnabled - property

1036

1487

@dbus_service_property(_interface, signature="s", access="read")

1037

1488

def LastEnabled_dbus_property(self):

1038

if self.last_enabled is None:

1039

return dbus.String("")

1040

return dbus.String(self._datetime_to_dbus(self.last_enabled))

1489

return datetime_to_dbus(self.last_enabled)

1041

1490

1042

1491

# Enabled - property

1043

1492

@dbus_service_property(_interface, signature="b",

1057

1506

if value is not None:

1058

1507

self.checked_ok()

1059

1508

return

1060

if self.last_checked_ok is None:

1061

return dbus.String("")

1062

return dbus.String(self._datetime_to_dbus(self

1063

.last_checked_ok))

1509

return datetime_to_dbus(self.last_checked_ok)

1510

1511

# LastCheckerStatus - property

1512

@dbus_service_property(_interface, signature="n",

1513

access="read")

1514

def LastCheckerStatus_dbus_property(self):

1515

return dbus.Int16(self.last_checker_status)

1516

1517

# Expires - property

1518

@dbus_service_property(_interface, signature="s", access="read")

1519

def Expires_dbus_property(self):

1520

return datetime_to_dbus(self.expires)

1064

1521

1065

1522

# LastApprovalRequest - property

1066

1523

@dbus_service_property(_interface, signature="s", access="read")

1067

1524

def LastApprovalRequest_dbus_property(self):

1068

if self.last_approval_request is None:

1069

return dbus.String("")

1070

return dbus.String(self.

1071

_datetime_to_dbus(self

1072

.last_approval_request))

1525

return datetime_to_dbus(self.last_approval_request)

1073

1526

1074

1527

# Timeout - property

1075

1528

@dbus_service_property(_interface, signature="t",

1077

1530

def Timeout_dbus_property(self, value=None):

1078

1531

if value is None: # get

1079

1532

return dbus.UInt64(self.timeout_milliseconds())

1533

old_timeout = self.timeout

1080

1534

self.timeout = datetime.timedelta(0, 0, 0, value)

1081

# Emit D-Bus signal

1082

self.PropertyChanged(dbus.String("Timeout"),

1083

dbus.UInt64(value, variant_level=1))

1084

if getattr(self, "disable_initiator_tag", None) is None:

1085

return

1086

# Reschedule timeout

1087

gobject.source_remove(self.disable_initiator_tag)

1088

self.disable_initiator_tag = None

1089

time_to_die = (self.

1090

_timedelta_to_milliseconds((self

1091

.last_checked_ok

1092

+ self.timeout)

1093

- datetime.datetime

1094

.utcnow()))

1095

if time_to_die <= 0:

1096

# The timeout has passed

1097

self.disable()

1098

else:

1099

self.disable_initiator_tag = (gobject.timeout_add

1100

(time_to_die, self.disable))

1535

# Reschedule disabling

1536

if self.enabled:

1537

now = datetime.datetime.utcnow()

1538

self.expires += self.timeout - old_timeout

1539

if self.expires <= now:

1540

# The timeout has passed

1541

self.disable()

1542

else:

1543

if (getattr(self, "disable_initiator_tag", None)

1544

is None):

1545

return

1546

gobject.source_remove(self.disable_initiator_tag)

1547

self.disable_initiator_tag = (

1548

gobject.timeout_add(

1549

timedelta_to_milliseconds(self.expires - now),

1550

self.disable))

1551

1552

# ExtendedTimeout - property

1553

@dbus_service_property(_interface, signature="t",

1554

access="readwrite")

1555

def ExtendedTimeout_dbus_property(self, value=None):

1556

if value is None: # get

1557

return dbus.UInt64(self.extended_timeout_milliseconds())

1558

self.extended_timeout = datetime.timedelta(0, 0, 0, value)

1101

1559

1102

1560

# Interval - property

1103

1561

@dbus_service_property(_interface, signature="t",

1106

1564

if value is None: # get

1107

1565

return dbus.UInt64(self.interval_milliseconds())

1108

1566

self.interval = datetime.timedelta(0, 0, 0, value)

1109

# Emit D-Bus signal

1110

self.PropertyChanged(dbus.String("Interval"),

1111

dbus.UInt64(value, variant_level=1))

1112

1567

if getattr(self, "checker_initiator_tag", None) is None:

1113

1568

return

1114

# Reschedule checker run

1115

gobject.source_remove(self.checker_initiator_tag)

1116

self.checker_initiator_tag = (gobject.timeout_add

1117

(value, self.start_checker))

1118

self.start_checker() # Start one now, too

1119

1569

if self.enabled:

1570

# Reschedule checker run

1571

gobject.source_remove(self.checker_initiator_tag)

1572

self.checker_initiator_tag = (gobject.timeout_add

1573

(value, self.start_checker))

1574

self.start_checker() # Start one now, too

1575

1120

1576

# Checker - property

1121

1577

@dbus_service_property(_interface, signature="s",

1122

1578

access="readwrite")

1123

1579

def Checker_dbus_property(self, value=None):

1124

1580

if value is None: # get

1125

1581

return dbus.String(self.checker_command)

1126

self.checker_command = value

1127

# Emit D-Bus signal

1128

self.PropertyChanged(dbus.String("Checker"),

1129

dbus.String(self.checker_command,

1130

variant_level=1))

1582

self.checker_command = unicode(value)

1131

1583

1132

1584

# CheckerRunning - property

1133

1585

@dbus_service_property(_interface, signature="b",

1160

1612

self._pipe.send(('init', fpr, address))

1161

1613

if not self._pipe.recv():

1162

1614

raise KeyError()

1163

1615

1164

1616

def __getattribute__(self, name):

1165

if(name == '_pipe'):

1617

if name == '_pipe':

1166

1618

return super(ProxyClient, self).__getattribute__(name)

1167

1619

self._pipe.send(('getattr', name))

1168

1620

data = self._pipe.recv()

1173

1625

self._pipe.send(('funcall', name, args, kwargs))

1174

1626

return self._pipe.recv()[1]

1175

1627

return func

1176

1628

1177

1629

def __setattr__(self, name, value):

1178

if(name == '_pipe'):

1630

if name == '_pipe':

1179

1631

return super(ProxyClient, self).__setattr__(name, value)

1180

1632

self._pipe.send(('setattr', name, value))

1181

1633

1192

1644

unicode(self.client_address))

1193

1645

logger.debug("Pipe FD: %d",

1194

1646

self.server.child_pipe.fileno())

1195

1647

1196

1648

session = (gnutls.connection

1197

1649

.ClientSession(self.request,

1198

1650

gnutls.connection

1199

1651

.X509Credentials()))

1200

1652

1201

1653

# Note: gnutls.connection.X509Credentials is really a

1202

1654

# generic GnuTLS certificate credentials object so long as

1203

1655

# no X.509 keys are added to it. Therefore, we can use it

1204

1656

# here despite using OpenPGP certificates.

1205

1657

1206

1658

#priority = ':'.join(("NONE", "+VERS-TLS1.1",

1207

1659

# "+AES-256-CBC", "+SHA1",

1208

1660

# "+COMP-NULL", "+CTYPE-OPENPGP",

1214

1666

(gnutls.library.functions

1215

1667

.gnutls_priority_set_direct(session._c_object,

1216

1668

priority, None))

1217

1669

1218

1670

# Start communication using the Mandos protocol

1219

1671

# Get protocol number

1220

1672

line = self.request.makefile().readline()

1225

1677

except (ValueError, IndexError, RuntimeError) as error:

1226

1678

logger.error("Unknown protocol version: %s", error)

1227

1679

return

1228

1680

1229

1681

# Start GnuTLS connection

1230

1682

try:

1231

1683

session.handshake()

1235

1687

# established. Just abandon the request.

1236

1688

return

1237

1689

logger.debug("Handshake succeeded")

1238

1690

1239

1691

approval_required = False

1240

1692

try:

1241

1693

try:

1246

1698

logger.warning("Bad certificate: %s", error)

1247

1699

return

1248

1700

logger.debug("Fingerprint: %s", fpr)

1249

1701

1250

1702

try:

1251

1703

client = ProxyClient(child_pipe, fpr,

1252

1704

self.client_address)

1260

1712

1261

1713

while True:

1262

1714

if not client.enabled:

1263

logger.warning("Client %s is disabled",

1715

logger.info("Client %s is disabled",

1264

1716

client.name)

1265

1717

if self.server.use_dbus:

1266

1718

# Emit D-Bus signal

1267

client.Rejected("Disabled")

1719

client.Rejected("Disabled")

1268

1720

return

1269

1721

1270

if client._approved or not client.approval_delay:

1722

if client.approved or not client.approval_delay:

1271

1723

#We are approved or approval is disabled

1272

1724

break

1273

elif client._approved is None:

1725

elif client.approved is None:

1274

1726

logger.info("Client %s needs approval",

1275

1727

client.name)

1276

1728

if self.server.use_dbus:

1287

1739

return

1288

1740

1289

1741

#wait until timeout or approved

1290

#x = float(client._timedelta_to_milliseconds(delay))

1291

1742

time = datetime.datetime.now()

1292

1743

client.changedstate.acquire()

1293

client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1294

1747

client.changedstate.release()

1295

1748

time2 = datetime.datetime.now()

1296

1749

if (time2 - time) >= delay:

1312

1765

try:

1313

1766

sent = session.send(client.secret[sent_size:])

1314

1767

except gnutls.errors.GNUTLSError as error:

1315

logger.warning("gnutls send failed")

1768

logger.warning("gnutls send failed",

1769

exc_info=error)

1316

1770

return

1317

1771

logger.debug("Sent: %d, remaining: %d",

1318

1772

sent, len(client.secret)

1319

1773

- (sent_size + sent))

1320

1774

sent_size += sent

1321

1775

1322

1776

logger.info("Sending secret to %s", client.name)

1323

# bump the timeout as if seen

1324

client.checked_ok()

1777

# bump the timeout using extended_timeout

1778

client.bump_timeout(client.extended_timeout)

1325

1779

if self.server.use_dbus:

1326

1780

# Emit D-Bus signal

1327

1781

client.GotSecret()

1332

1786

try:

1333

1787

session.bye()

1334

1788

except gnutls.errors.GNUTLSError as error:

1335

logger.warning("GnuTLS bye failed")

1789

logger.warning("GnuTLS bye failed",

1790

exc_info=error)

1336

1791

1337

1792

@staticmethod

1338

1793

def peer_certificate(session):

1394

1849

# Convert the buffer to a Python bytestring

1395

1850

fpr = ctypes.string_at(buf, buf_len.value)

1396

1851

# Convert the bytestring to hexadecimal notation

1397

hex_fpr = ''.join("%02X" % ord(char) for char in fpr)

1852

hex_fpr = binascii.hexlify(fpr).upper()

1398

1853

return hex_fpr

1399

1854

1400

1855

1403

1858

def sub_process_main(self, request, address):

1404

1859

try:

1405

1860

self.finish_request(request, address)

1406

except:

1861

except Exception:

1407

1862

self.handle_error(request, address)

1408

1863

self.close_request(request)

1409

1864

1410

1865

def process_request(self, request, address):

1411

1866

"""Start a new process to process the request."""

1412

multiprocessing.Process(target = self.sub_process_main,

1413

args = (request, address)).start()

1867

proc = multiprocessing.Process(target = self.sub_process_main,

1868

args = (request, address))

1869

proc.start()

1870

return proc

1871

1414

1872

1415

1873

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1416

1874

""" adds a pipe to the MixIn """

1420

1878

This function creates a new pipe in self.pipe

1421

1879

"""

1422

1880

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1423

1424

super(MultiprocessingMixInWithPipe,

1425

self).process_request(request, client_address)

1881

1882

proc = MultiprocessingMixIn.process_request(self, request,

1883

client_address)

1426

1884

self.child_pipe.close()

1427

self.add_pipe(parent_pipe)

1428

1429

def add_pipe(self, parent_pipe):

1885

self.add_pipe(parent_pipe, proc)

1886

1887

def add_pipe(self, parent_pipe, proc):

1430

1888

"""Dummy function; override as necessary"""

1431

1889

raise NotImplementedError

1432

1890

1891

1433

1892

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1434

1893

socketserver.TCPServer, object):

1435

1894

"""IPv6-capable TCP server. Accepts 'None' as address and/or port

1440

1899

use_ipv6: Boolean; to use IPv6 or not

1441

1900

"""

1442

1901

def __init__(self, server_address, RequestHandlerClass,

1443

interface=None, use_ipv6=True):

1902

interface=None, use_ipv6=True, socketfd=None):

1903

"""If socketfd is set, use that file descriptor instead of

1904

creating a new one with socket.socket().

1905

"""

1444

1906

self.interface = interface

1445

1907

if use_ipv6:

1446

1908

self.address_family = socket.AF_INET6

1909

if socketfd is not None:

1910

# Save the file descriptor

1911

self.socketfd = socketfd

1912

# Save the original socket.socket() function

1913

self.socket_socket = socket.socket

1914

# To implement --socket, we monkey patch socket.socket.

1915

#

1916

# (When socketserver.TCPServer is a new-style class, we

1917

# could make self.socket into a property instead of monkey

1918

# patching socket.socket.)

1919

#

1920

# Create a one-time-only replacement for socket.socket()

1921

@functools.wraps(socket.socket)

1922

def socket_wrapper(*args, **kwargs):

1923

# Restore original function so subsequent calls are

1924

# not affected.

1925

socket.socket = self.socket_socket

1926

del self.socket_socket

1927

# This time only, return a new socket object from the

1928

# saved file descriptor.

1929

return socket.fromfd(self.socketfd, *args, **kwargs)

1930

# Replace socket.socket() function with wrapper

1931

socket.socket = socket_wrapper

1932

# The socketserver.TCPServer.__init__ will call

1933

# socket.socket(), which might be our replacement,

1934

# socket_wrapper(), if socketfd was set.

1447

1935

socketserver.TCPServer.__init__(self, server_address,

1448

1936

RequestHandlerClass)

1937

1449

1938

def server_bind(self):

1450

1939

"""This overrides the normal server_bind() function

1451

1940

to bind to an interface if one was specified, and also NOT to

1459

1948

try:

1460

1949

self.socket.setsockopt(socket.SOL_SOCKET,

1461

1950

SO_BINDTODEVICE,

1462

str(self.interface

1463

+ '\0'))

1951

str(self.interface + '\0'))

1464

1952

except socket.error as error:

1465

if error[0] == errno.EPERM:

1466

logger.error("No permission to"

1467

" bind to interface %s",

1468

self.interface)

1469

elif error[0] == errno.ENOPROTOOPT:

1953

if error.errno == errno.EPERM:

1954

logger.error("No permission to bind to"

1955

" interface %s", self.interface)

1956

elif error.errno == errno.ENOPROTOOPT:

1470

1957

logger.error("SO_BINDTODEVICE not available;"

1471

1958

" cannot bind to interface %s",

1472

1959

self.interface)

1960

elif error.errno == errno.ENODEV:

1961

logger.error("Interface %s does not exist,"

1962

" cannot bind", self.interface)

1473

1963

else:

1474

1964

raise

1475

1965

# Only bind(2) the socket if we really need to.

1505

1995

"""

1506

1996

def __init__(self, server_address, RequestHandlerClass,

1507

1997

interface=None, use_ipv6=True, clients=None,

1508

gnutls_priority=None, use_dbus=True):

1998

gnutls_priority=None, use_dbus=True, socketfd=None):

1509

1999

self.enabled = False

1510

2000

self.clients = clients

1511

2001

if self.clients is None:

1512

self.clients = set()

2002

self.clients = {}

1513

2003

self.use_dbus = use_dbus

1514

2004

self.gnutls_priority = gnutls_priority

1515

2005

IPv6_TCPServer.__init__(self, server_address,

1516

2006

RequestHandlerClass,

1517

2007

interface = interface,

1518

use_ipv6 = use_ipv6)

2008

use_ipv6 = use_ipv6,

2009

socketfd = socketfd)

1519

2010

def server_activate(self):

1520

2011

if self.enabled:

1521

2012

return socketserver.TCPServer.server_activate(self)

2013

1522

2014

def enable(self):

1523

2015

self.enabled = True

1524

def add_pipe(self, parent_pipe):

2016

2017

def add_pipe(self, parent_pipe, proc):

1525

2018

# Call "handle_ipc" for both data and EOF events

1526

2019

gobject.io_add_watch(parent_pipe.fileno(),

1527

2020

gobject.IO_IN | gobject.IO_HUP,

1528

2021

functools.partial(self.handle_ipc,

1529

parent_pipe = parent_pipe))

1530

2022

parent_pipe =

2023

parent_pipe,

2024

proc = proc))

2025

1531

2026

def handle_ipc(self, source, condition, parent_pipe=None,

1532

client_object=None):

1533

condition_names = {

1534

gobject.IO_IN: "IN", # There is data to read.

1535

gobject.IO_OUT: "OUT", # Data can be written (without

1536

# blocking).

1537

gobject.IO_PRI: "PRI", # There is urgent data to read.

1538

gobject.IO_ERR: "ERR", # Error condition.

1539

gobject.IO_HUP: "HUP" # Hung up (the connection has been

1540

# broken, usually for pipes and

1541

# sockets).

1542

}

1543

conditions_string = ' | '.join(name

1544

for cond, name in

1545

condition_names.iteritems()

1546

if cond & condition)

1547

# error or the other end of multiprocessing.Pipe has closed

1548

if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):

2027

proc = None, client_object=None):

2028

# error, or the other end of multiprocessing.Pipe has closed

2029

if condition & (gobject.IO_ERR | gobject.IO_HUP):

2030

# Wait for other process to exit

2031

proc.join()

1549

2032

return False

1550

2033

1551

2034

# Read a request from the child

1556

2039

fpr = request[1]

1557

2040

address = request[2]

1558

2041

1559

for c in self.clients:

2042

for c in self.clients.itervalues():

1560

2043

if c.fingerprint == fpr:

1561

2044

client = c

1562

2045

break

1563

2046

else:

1564

logger.warning("Client not found for fingerprint: %s, ad"

1565

"dress: %s", fpr, address)

2047

logger.info("Client not found for fingerprint: %s, ad"

2048

"dress: %s", fpr, address)

1566

2049

if self.use_dbus:

1567

2050

# Emit D-Bus signal

1568

mandos_dbus_service.ClientNotFound(fpr, address[0])

2051

mandos_dbus_service.ClientNotFound(fpr,

2052

address[0])

1569

2053

parent_pipe.send(False)

1570

2054

return False

1571

2055

1572

2056

gobject.io_add_watch(parent_pipe.fileno(),

1573

2057

gobject.IO_IN | gobject.IO_HUP,

1574

2058

functools.partial(self.handle_ipc,

1575

parent_pipe = parent_pipe,

1576

client_object = client))

2059

parent_pipe =

2060

parent_pipe,

2061

proc = proc,

2062

client_object =

2063

client))

1577

2064

parent_pipe.send(True)

1578

# remove the old hook in favor of the new above hook on same fileno

2065

# remove the old hook in favor of the new above hook on

2066

# same fileno

1579

2067

return False

1580

2068

if command == 'funcall':

1581

2069

funcname = request[1]

1582

2070

args = request[2]

1583

2071

kwargs = request[3]

1584

2072

1585

parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))

1586

2073

parent_pipe.send(('data', getattr(client_object,

2074

funcname)(*args,

2075

**kwargs)))

2076

1587

2077

if command == 'getattr':

1588

2078

attrname = request[1]

1589

2079

if callable(client_object.__getattribute__(attrname)):

1590

2080

parent_pipe.send(('function',))

1591

2081

else:

1592

parent_pipe.send(('data', client_object.__getattribute__(attrname)))

2082

parent_pipe.send(('data', client_object

2083

.__getattribute__(attrname)))

1593

2084

1594

2085

if command == 'setattr':

1595

2086

attrname = request[1]

1596

2087

value = request[2]

1597

2088

setattr(client_object, attrname, value)

1598

2089

1599

2090

return True

1600

2091

1601

2092

1631

2122

elif suffix == "w":

1632

2123

delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)

1633

2124

else:

1634

raise ValueError("Unknown suffix %r" % suffix)

2125

raise ValueError("Unknown suffix {0!r}"

2126

.format(suffix))

1635

2127

except (ValueError, IndexError) as e:

1636

2128

raise ValueError(*(e.args))

1637

2129

timevalue += delta

1638

2130

return timevalue

1639

2131

1640

2132

1641

def if_nametoindex(interface):

1642

"""Call the C function if_nametoindex(), or equivalent

1643

1644

Note: This function cannot accept a unicode string."""

1645

global if_nametoindex

1646

try:

1647

if_nametoindex = (ctypes.cdll.LoadLibrary

1648

(ctypes.util.find_library("c"))

1649

.if_nametoindex)

1650

except (OSError, AttributeError):

1651

logger.warning("Doing if_nametoindex the hard way")

1652

def if_nametoindex(interface):

1653

"Get an interface index the hard way, i.e. using fcntl()"

1654

SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

1655

with contextlib.closing(socket.socket()) as s:

1656

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1657

struct.pack(str("16s16x"),

1658

interface))

1659

interface_index = struct.unpack(str("I"),

1660

ifreq[16:20])[0]

1661

return interface_index

1662

return if_nametoindex(interface)

1663

1664

1665

2133

def daemon(nochdir = False, noclose = False):

1666

2134

"""See daemon(3). Standard BSD Unix function.

1667

2135

1675

2143

sys.exit()

1676

2144

if not noclose:

1677

2145

# Close all standard open file descriptors

1678

null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)

2146

null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)

1679

2147

if not stat.S_ISCHR(os.fstat(null).st_mode):

1680

2148

raise OSError(errno.ENODEV,

1681

"%s not a character device"

1682

% os.path.devnull)

2149

"{0} not a character device"

2150

.format(os.devnull))

1683

2151

os.dup2(null, sys.stdin.fileno())

1684

2152

os.dup2(null, sys.stdout.fileno())

1685

2153

os.dup2(null, sys.stderr.fileno())

1694

2162

1695

2163

parser = argparse.ArgumentParser()

1696

2164

parser.add_argument("-v", "--version", action="version",

1697

version = "%%(prog)s %s" % version,

2165

version = "%(prog)s {0}".format(version),

1698

2166

help="show version number and exit")

1699

2167

parser.add_argument("-i", "--interface", metavar="IF",

1700

2168

help="Bind to interface IF")

1722

2190

" system bus interface")

1723

2191

parser.add_argument("--no-ipv6", action="store_false",

1724

2192

dest="use_ipv6", help="Do not use IPv6")

2193

parser.add_argument("--no-restore", action="store_false",

2194

dest="restore", help="Do not restore stored"

2195

" state")

2196

parser.add_argument("--socket", type=int,

2197

help="Specify a file descriptor to a network"

2198

" socket to use instead of creating one")

2199

parser.add_argument("--statedir", metavar="DIR",

2200

help="Directory to save/restore state in")

2201

parser.add_argument("--foreground", action="store_true",

2202

help="Run in foreground")

2203

1725

2204

options = parser.parse_args()

1726

2205

1727

2206

if options.check:

1740

2219

"use_dbus": "True",

1741

2220

"use_ipv6": "True",

1742

2221

"debuglevel": "",

2222

"restore": "True",

2223

"socket": "",

2224

"statedir": "/var/lib/mandos",

2225

"foreground": "False",

1743

2226

}

1744

2227

1745

2228

# Parse config file for server-global settings

1750

2233

# Convert the SafeConfigParser object to a dict

1751

2234

server_settings = server_config.defaults()

1752

2235

# Use the appropriate methods on the non-string config options

1753

for option in ("debug", "use_dbus", "use_ipv6"):

2236

for option in ("debug", "use_dbus", "use_ipv6", "foreground"):

1754

2237

server_settings[option] = server_config.getboolean("DEFAULT",

1755

2238

option)

1756

2239

if server_settings["port"]:

1757

2240

server_settings["port"] = server_config.getint("DEFAULT",

1758

2241

"port")

2242

if server_settings["socket"]:

2243

server_settings["socket"] = server_config.getint("DEFAULT",

2244

"socket")

2245

# Later, stdin will, and stdout and stderr might, be dup'ed

2246

# over with an opened os.devnull. But we don't want this to

2247

# happen with a supplied network socket.

2248

if 0 <= server_settings["socket"] <= 2:

2249

server_settings["socket"] = os.dup(server_settings

2250

["socket"])

1759

2251

del server_config

1760

2252

1761

2253

# Override the settings from the config file with command line

1762

2254

# options, if set.

1763

2255

for option in ("interface", "address", "port", "debug",

1764

2256

"priority", "servicename", "configdir",

1765

"use_dbus", "use_ipv6", "debuglevel"):

2257

"use_dbus", "use_ipv6", "debuglevel", "restore",

2258

"statedir", "socket", "foreground"):

1766

2259

value = getattr(options, option)

1767

2260

if value is not None:

1768

2261

server_settings[option] = value

1771

2264

for option in server_settings.keys():

1772

2265

if type(server_settings[option]) is str:

1773

2266

server_settings[option] = unicode(server_settings[option])

2267

# Debug implies foreground

2268

if server_settings["debug"]:

2269

server_settings["foreground"] = True

1774

2270

# Now we have our good server settings in "server_settings"

1775

2271

1776

2272

##################################################################

1780

2276

debuglevel = server_settings["debuglevel"]

1781

2277

use_dbus = server_settings["use_dbus"]

1782

2278

use_ipv6 = server_settings["use_ipv6"]

1783

2279

stored_state_path = os.path.join(server_settings["statedir"],

2280

stored_state_file)

2281

foreground = server_settings["foreground"]

2282

2283

if debug:

2284

initlogger(debug, logging.DEBUG)

2285

else:

2286

if not debuglevel:

2287

initlogger(debug)

2288

else:

2289

level = getattr(logging, debuglevel.upper())

2290

initlogger(debug, level)

2291

1784

2292

if server_settings["servicename"] != "Mandos":

1785

2293

syslogger.setFormatter(logging.Formatter

1786

('Mandos (%s) [%%(process)d]:'

1787

' %%(levelname)s: %%(message)s'

1788

% server_settings["servicename"]))

2294

('Mandos ({0}) [%(process)d]:'

2295

' %(levelname)s: %(message)s'

2296

.format(server_settings

2297

["servicename"])))

1789

2298

1790

2299

# Parse config file with clients

1791

client_defaults = { "timeout": "1h",

1792

"interval": "5m",

1793

"checker": "fping -q -- %%(host)s",

1794

"host": "",

1795

"approval_delay": "0s",

1796

"approval_duration": "1s",

1797

}

1798

client_config = configparser.SafeConfigParser(client_defaults)

2300

client_config = configparser.SafeConfigParser(Client

2301

.client_defaults)

1799

2302

client_config.read(os.path.join(server_settings["configdir"],

1800

2303

"clients.conf"))

1801

2304

1810

2313

use_ipv6=use_ipv6,

1811

2314

gnutls_priority=

1812

2315

server_settings["priority"],

1813

use_dbus=use_dbus)

1814

if not debug:

2316

use_dbus=use_dbus,

2317

socketfd=(server_settings["socket"]

2318

or None))

2319

if not foreground:

1815

2320

pidfilename = "/var/run/mandos.pid"

2321

pidfile = None

1816

2322

try:

1817

2323

pidfile = open(pidfilename, "w")

1818

except IOError:

1819

logger.error("Could not open file %r", pidfilename)

2324

except IOError as e:

2325

logger.error("Could not open file %r", pidfilename,

2326

exc_info=e)

1820

2327

1821

try:

1822

uid = pwd.getpwnam("_mandos").pw_uid

1823

gid = pwd.getpwnam("_mandos").pw_gid

1824

except KeyError:

2328

for name in ("_mandos", "mandos", "nobody"):

1825

2329

try:

1826

uid = pwd.getpwnam("mandos").pw_uid

1827

gid = pwd.getpwnam("mandos").pw_gid

2330

uid = pwd.getpwnam(name).pw_uid

2331

gid = pwd.getpwnam(name).pw_gid

2332

break

1828

2333

except KeyError:

1829

try:

1830

uid = pwd.getpwnam("nobody").pw_uid

1831

gid = pwd.getpwnam("nobody").pw_gid

1832

except KeyError:

1833

uid = 65534

1834

gid = 65534

2334

continue

2335

else:

2336

uid = 65534

2337

gid = 65534

1835

2338

try:

1836

2339

os.setgid(gid)

1837

2340

os.setuid(uid)

1838

2341

except OSError as error:

1839

if error[0] != errno.EPERM:

2342

if error.errno != errno.EPERM:

1840

2343

raise error

1841

2344

1842

if not debug and not debuglevel:

1843

syslogger.setLevel(logging.WARNING)

1844

console.setLevel(logging.WARNING)

1845

if debuglevel:

1846

level = getattr(logging, debuglevel.upper())

1847

syslogger.setLevel(level)

1848

console.setLevel(level)

1849

1850

2345

if debug:

1851

2346

# Enable all possible GnuTLS debugging

1852

2347

1862

2357

.gnutls_global_set_log_function(debug_gnutls))

1863

2358

1864

2359

# Redirect stdin so all checkers get /dev/null

1865

null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)

2360

null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)

1866

2361

os.dup2(null, sys.stdin.fileno())

1867

2362

if null > 2:

1868

2363

os.close(null)

1869

else:

1870

# No console logging

1871

logger.removeHandler(console)

1872

2364

1873

2365

# Need to fork before connecting to D-Bus

1874

if not debug:

2366

if not foreground:

1875

2367

# Close all input and output, do double fork, etc.

1876

2368

daemon()

1877

2369

2370

# multiprocessing will use threads, so before we use gobject we

2371

# need to inform gobject that threads will be used.

2372

gobject.threads_init()

2373

1878

2374

global main_loop

1879

2375

# From the Avahi example code

1880

DBusGMainLoop(set_as_default=True )

2376

DBusGMainLoop(set_as_default=True)

1881

2377

main_loop = gobject.MainLoop()

1882

2378

bus = dbus.SystemBus()

1883

2379

# End of Avahi example code

1884

2380

if use_dbus:

1885

2381

try:

1886

bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",

2382

bus_name = dbus.service.BusName("se.recompile.Mandos",

1887

2383

bus, do_not_queue=True)

2384

old_bus_name = (dbus.service.BusName

2385

("se.bsnet.fukt.Mandos", bus,

2386

do_not_queue=True))

1888

2387

except dbus.exceptions.NameExistsException as e:

1889

logger.error(unicode(e) + ", disabling D-Bus")

2388

logger.error("Disabling D-Bus:", exc_info=e)

1890

2389

use_dbus = False

1891

2390

server_settings["use_dbus"] = False

1892

2391

tcp_server.use_dbus = False

1893

2392

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1894

service = AvahiService(name = server_settings["servicename"],

1895

servicetype = "_mandos._tcp",

1896

protocol = protocol, bus = bus)

2393

service = AvahiServiceToSyslog(name =

2394

server_settings["servicename"],

2395

servicetype = "_mandos._tcp",

2396

protocol = protocol, bus = bus)

1897

2397

if server_settings["interface"]:

1898

2398

service.interface = (if_nametoindex

1899

2399

(str(server_settings["interface"])))

1904

2404

client_class = Client

1905

2405

if use_dbus:

1906

2406

client_class = functools.partial(ClientDBus, bus = bus)

1907

def client_config_items(config, section):

1908

special_settings = {

1909

"approved_by_default":

1910

lambda: config.getboolean(section,

1911

"approved_by_default"),

1912

}

1913

for name, value in config.items(section):

2407

2408

client_settings = Client.config_parser(client_config)

2409

old_client_settings = {}

2410

clients_data = {}

2411

2412

# Get client data and settings from last running state.

2413

if server_settings["restore"]:

2414

try:

2415

with open(stored_state_path, "rb") as stored_state:

2416

clients_data, old_client_settings = (pickle.load

2417

(stored_state))

2418

os.remove(stored_state_path)

2419

except IOError as e:

2420

if e.errno == errno.ENOENT:

2421

logger.warning("Could not load persistent state: {0}"

2422

.format(os.strerror(e.errno)))

2423

else:

2424

logger.critical("Could not load persistent state:",

2425

exc_info=e)

2426

raise

2427

except EOFError as e:

2428

logger.warning("Could not load persistent state: "

2429

"EOFError:", exc_info=e)

2430

2431

with PGPEngine() as pgp:

2432

for client_name, client in clients_data.iteritems():

2433

# Decide which value to use after restoring saved state.

2434

# We have three different values: Old config file,

2435

# new config file, and saved state.

2436

# New config value takes precedence if it differs from old

2437

# config value, otherwise use saved state.

2438

for name, value in client_settings[client_name].items():

2439

try:

2440

# For each value in new config, check if it

2441

# differs from the old config value (Except for

2442

# the "secret" attribute)

2443

if (name != "secret" and

2444

value != old_client_settings[client_name]

2445

[name]):

2446

client[name] = value

2447

except KeyError:

2448

pass

2449

2450

# Clients who has passed its expire date can still be

2451

# enabled if its last checker was successful. Clients

2452

# whose checker succeeded before we stored its state is

2453

# assumed to have successfully run all checkers during

2454

# downtime.

2455

if client["enabled"]:

2456

if datetime.datetime.utcnow() >= client["expires"]:

2457

if not client["last_checked_ok"]:

2458

logger.warning(

2459

"disabling client {0} - Client never "

2460

"performed a successful checker"

2461

.format(client_name))

2462

client["enabled"] = False

2463

elif client["last_checker_status"] != 0:

2464

logger.warning(

2465

"disabling client {0} - Client "

2466

"last checker failed with error code {1}"

2467

.format(client_name,

2468

client["last_checker_status"]))

2469

client["enabled"] = False

2470

else:

2471

client["expires"] = (datetime.datetime

2472

.utcnow()

2473

+ client["timeout"])

2474

logger.debug("Last checker succeeded,"

2475

" keeping {0} enabled"

2476

.format(client_name))

1914

2477

try:

1915

yield (name, special_settings[name]())

1916

except KeyError:

1917

yield (name, value)

1918

1919

tcp_server.clients.update(set(

1920

client_class(name = section,

1921

config= dict(client_config_items(

1922

client_config, section)))

1923

for section in client_config.sections()))

2478

client["secret"] = (

2479

pgp.decrypt(client["encrypted_secret"],

2480

client_settings[client_name]

2481

["secret"]))

2482

except PGPError:

2483

# If decryption fails, we use secret from new settings

2484

logger.debug("Failed to decrypt {0} old secret"

2485

.format(client_name))

2486

client["secret"] = (

2487

client_settings[client_name]["secret"])

2488

2489

# Add/remove clients based on new changes made to config

2490

for client_name in (set(old_client_settings)

2491

- set(client_settings)):

2492

del clients_data[client_name]

2493

for client_name in (set(client_settings)

2494

- set(old_client_settings)):

2495

clients_data[client_name] = client_settings[client_name]

2496

2497

# Create all client objects

2498

for client_name, client in clients_data.iteritems():

2499

tcp_server.clients[client_name] = client_class(

2500

name = client_name, settings = client)

2501

1924

2502

if not tcp_server.clients:

1925

2503

logger.warning("No clients defined")

1926

1927

if not debug:

1928

try:

1929

with pidfile:

1930

pid = os.getpid()

1931

pidfile.write(str(pid) + "\n".encode("utf-8"))

1932

del pidfile

1933

except IOError:

1934

logger.error("Could not write to file %r with PID %d",

1935

pidfilename, pid)

1936

except NameError:

1937

# "pidfile" was never created

1938

pass

2504

2505

if not foreground:

2506

if pidfile is not None:

2507

try:

2508

with pidfile:

2509

pid = os.getpid()

2510

pidfile.write(str(pid) + "\n".encode("utf-8"))

2511

except IOError:

2512

logger.error("Could not write to file %r with PID %d",

2513

pidfilename, pid)

2514

del pidfile

1939

2515

del pidfilename

1940

1941

signal.signal(signal.SIGINT, signal.SIG_IGN)

1942

2516

1943

2517

signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())

1944

2518

signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())

1945

2519

1946

2520

if use_dbus:

1947

class MandosDBusService(dbus.service.Object):

2521

@alternate_dbus_interfaces({"se.recompile.Mandos":

2522

"se.bsnet.fukt.Mandos"})

2523

class MandosDBusService(DBusObjectWithProperties):

1948

2524

"""A D-Bus proxy object"""

1949

2525

def __init__(self):

1950

2526

dbus.service.Object.__init__(self, bus, "/")

1951

_interface = "se.bsnet.fukt.Mandos"

2527

_interface = "se.recompile.Mandos"

2528

2529

@dbus_interface_annotations(_interface)

2530

def _foo(self):

2531

return { "org.freedesktop.DBus.Property"

2532

".EmitsChangedSignal":

2533

"false"}

1952

2534

1953

2535

@dbus.service.signal(_interface, signature="o")

1954

2536

def ClientAdded(self, objpath):

1969

2551

def GetAllClients(self):

1970

2552

"D-Bus method"

1971

2553

return dbus.Array(c.dbus_object_path

1972

for c in tcp_server.clients)

2554

for c in

2555

tcp_server.clients.itervalues())

1973

2556

1974

2557

@dbus.service.method(_interface,

1975

2558

out_signature="a{oa{sv}}")

1977

2560

"D-Bus method"

1978

2561

return dbus.Dictionary(

1979

2562

((c.dbus_object_path, c.GetAll(""))

1980

for c in tcp_server.clients),

2563

for c in tcp_server.clients.itervalues()),

1981

2564

signature="oa{sv}")

1982

2565

1983

2566

@dbus.service.method(_interface, in_signature="o")

1984

2567

def RemoveClient(self, object_path):

1985

2568

"D-Bus method"

1986

for c in tcp_server.clients:

2569

for c in tcp_server.clients.itervalues():

1987

2570

if c.dbus_object_path == object_path:

1988

tcp_server.clients.remove(c)

2571

del tcp_server.clients[c.name]

1989

2572

c.remove_from_connection()

1990

2573

# Don't signal anything except ClientRemoved

1991

2574

c.disable(quiet=True)

2002

2585

"Cleanup function; run on exit"

2003

2586

service.cleanup()

2004

2587

2588

multiprocessing.active_children()

2589

if not (tcp_server.clients or client_settings):

2590

return

2591

2592

# Store client before exiting. Secrets are encrypted with key

2593

# based on what config file has. If config file is

2594

# removed/edited, old secret will thus be unrecovable.

2595

clients = {}

2596

with PGPEngine() as pgp:

2597

for client in tcp_server.clients.itervalues():

2598

key = client_settings[client.name]["secret"]

2599

client.encrypted_secret = pgp.encrypt(client.secret,

2600

key)

2601

client_dict = {}

2602

2603

# A list of attributes that can not be pickled

2604

# + secret.

2605

exclude = set(("bus", "changedstate", "secret",

2606

"checker"))

2607

for name, typ in (inspect.getmembers

2608

(dbus.service.Object)):

2609

exclude.add(name)

2610

2611

client_dict["encrypted_secret"] = (client

2612

.encrypted_secret)

2613

for attr in client.client_structure:

2614

if attr not in exclude:

2615

client_dict[attr] = getattr(client, attr)

2616

2617

clients[client.name] = client_dict

2618

del client_settings[client.name]["secret"]

2619

2620

try:

2621

with (tempfile.NamedTemporaryFile

2622

(mode='wb', suffix=".pickle", prefix='clients-',

2623

dir=os.path.dirname(stored_state_path),

2624

delete=False)) as stored_state:

2625

pickle.dump((clients, client_settings), stored_state)

2626

tempname=stored_state.name

2627

os.rename(tempname, stored_state_path)

2628

except (IOError, OSError) as e:

2629

if not debug:

2630

try:

2631

os.remove(tempname)

2632

except NameError:

2633

pass

2634

if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):

2635

logger.warning("Could not save persistent state: {0}"

2636

.format(os.strerror(e.errno)))

2637

else:

2638

logger.warning("Could not save persistent state:",

2639

exc_info=e)

2640

raise e

2641

2642

# Delete all clients, and settings from config

2005

2643

while tcp_server.clients:

2006

client = tcp_server.clients.pop()

2644

name, client = tcp_server.clients.popitem()

2007

2645

if use_dbus:

2008

2646

client.remove_from_connection()

2009

client.disable_hook = None

2010

2647

# Don't signal anything except ClientRemoved

2011

2648

client.disable(quiet=True)

2012

2649

if use_dbus:

2013

2650

# Emit D-Bus signal

2014

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2651

mandos_dbus_service.ClientRemoved(client

2652

.dbus_object_path,

2015

2653

client.name)

2654

client_settings.clear()

2016

2655

2017

2656

atexit.register(cleanup)

2018

2657

2019

for client in tcp_server.clients:

2658

for client in tcp_server.clients.itervalues():

2020

2659

if use_dbus:

2021

2660

# Emit D-Bus signal

2022

2661

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2023

client.enable()

2662

# Need to initiate checking of clients

2663

if client.enabled:

2664

client.init_checker()

2024

2665

2025

2666

tcp_server.enable()

2026

2667

tcp_server.server_activate()

2029

2670

service.port = tcp_server.socket.getsockname()[1]

2030

2671

if use_ipv6:

2031

2672

logger.info("Now listening on address %r, port %d,"

2032

" flowinfo %d, scope_id %d"

2033

% tcp_server.socket.getsockname())

2673

" flowinfo %d, scope_id %d",

2674

*tcp_server.socket.getsockname())

2034

2675

else: # IPv4

2035

logger.info("Now listening on address %r, port %d"

2036

% tcp_server.socket.getsockname())

2676

logger.info("Now listening on address %r, port %d",

2677

*tcp_server.socket.getsockname())

2037

2678

2038

2679

#service.interface = tcp_server.socket.getsockname()[3]

2039

2680

2042

2683

try:

2043

2684

service.activate()

2044

2685

except dbus.exceptions.DBusException as error:

2045

logger.critical("DBusException: %s", error)

2686

logger.critical("D-Bus Exception", exc_info=error)

2046

2687

cleanup()

2047

2688

sys.exit(1)

2048

2689

# End of Avahi example code

2055

2696

logger.debug("Starting main loop")

2056

2697

main_loop.run()

2057

2698

except AvahiError as error:

2058

logger.critical("AvahiError: %s", error)

2699

logger.critical("Avahi Error", exc_info=error)

2059

2700

cleanup()

2060

2701

sys.exit(1)

2061

2702

except KeyboardInterrupt: