/mandos/trunk : revision 463.1.10

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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@recompile.se>.

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# Contact the authors at <mandos@fukt.bsnet.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 optparse

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import datetime

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import errno

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import gnutls.crypto

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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 = "1.5.5"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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version = "1.2.3"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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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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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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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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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.group = None # our entry group

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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

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.GetAlternativeServiceName(self.name))

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self.name = unicode(self.server.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("D-Bus Exception", exc_info=error)

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except dbus.exceptions.DBusException, error:

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logger.critical("DBusException: %s", 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.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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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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self.group.connect_to_signal('StateChanged',

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self

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.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: {0!s}"

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(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.Free()

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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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def server_state_changed(self, state):

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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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bad_states = { avahi.SERVER_INVALID:

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"Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

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"Zeroconf server name collision",

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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] 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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if state == avahi.SERVER_COLLISION:

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logger.error("Zeroconf server name collision")

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self.remove()

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elif state == avahi.SERVER_RUNNING:

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self.add()

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else:

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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 = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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avahi.DBUS_PATH_SERVER,

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follow_name_owner_changes=True),

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avahi.DBUS_PATH_SERVER),

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avahi.DBUS_INTERFACE_SERVER)

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self.server.connect_to_signal("StateChanged",

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self.server_state_changed)

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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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404

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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_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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last_enabled: datetime.datetime(); (UTC)

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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", "expires",

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

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"last_approval_request", "last_checked_ok",

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

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

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

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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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@staticmethod

282

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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def timeout_milliseconds(self):

461

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"Return the 'timeout' attribute in milliseconds"

462

return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

465

"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return self._timedelta_to_milliseconds(self.timeout)

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468

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def interval_milliseconds(self):

469

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"Return the 'interval' attribute in milliseconds"

470

return timedelta_to_milliseconds(self.interval)

471

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return self._timedelta_to_milliseconds(self.interval)

295

472

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def approval_delay_milliseconds(self):

473

return timedelta_to_milliseconds(self.approval_delay)

474

475

@staticmethod

476

def config_parser(config):

477

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

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

479

with exceptions for any special settings as defined above.

480

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

481

value given the same arguments.

482

"""

483

settings = {}

484

for client_name in config.sections():

485

section = dict(config.items(client_name))

486

client = settings[client_name] = {}

487

488

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

489

# Reformat values from string types to Python types

490

client["approved_by_default"] = config.getboolean(

491

client_name, "approved_by_default")

492

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

493

"enabled")

494

495

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

496

.replace(" ", ""))

497

if "secret" in section:

498

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

499

elif "secfile" in section:

500

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

501

(section["secfile"])),

502

"rb") as secfile:

503

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

504

else:

505

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

506

.format(section))

507

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

508

client["extended_timeout"] = string_to_delta(

509

section["extended_timeout"])

510

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

511

client["approval_delay"] = string_to_delta(

512

section["approval_delay"])

513

client["approval_duration"] = string_to_delta(

514

section["approval_duration"])

515

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

516

client["last_approval_request"] = None

517

client["last_checked_ok"] = None

518

client["last_checker_status"] = -2

519

520

return settings

521

522

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

297

return self._timedelta_to_milliseconds(self.approval_delay)

298

299

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

300

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

301

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

302

attribute."""

523

303

self.name = name

524

# adding all client settings

525

for setting, value in settings.iteritems():

526

setattr(self, setting, value)

527

528

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

537

304

if config is None:

305

config = {}

538

306

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

539

307

# Uppercase and remove spaces from fingerprint for later

540

308

# comparison purposes with return value from the fingerprint()

541

309

# function

310

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

311

.replace(" ", ""))

542

312

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

543

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

544

datetime.datetime.utcnow())

545

546

# attributes specific for this server instance

313

if "secret" in config:

314

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

315

elif "secfile" in config:

316

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

317

(config["secfile"])),

318

"rb") as secfile:

319

self.secret = secfile.read()

320

else:

321

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

322

% self.name)

323

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

324

self.created = datetime.datetime.utcnow()

325

self.enabled = False

326

self.last_approval_request = None

327

self.last_enabled = None

328

self.last_checked_ok = None

329

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

330

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

331

self.disable_hook = disable_hook

547

332

self.checker = None

548

333

self.checker_initiator_tag = None

549

334

self.disable_initiator_tag = None

550

335

self.checker_callback_tag = None

336

self.checker_command = config["checker"]

551

337

self.current_checker_command = None

552

self.approved = None

338

self.last_connect = None

339

self._approved = None

340

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

341

True)

553

342

self.approvals_pending = 0

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

562

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)

343

self.approval_delay = string_to_delta(

344

config["approval_delay"])

345

self.approval_duration = string_to_delta(

346

config["approval_duration"])

347

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

568

348

569

# Send notice to process children that client state has changed

570

349

def send_changedstate(self):

571

with self.changedstate:

572

self.changedstate.notify_all()

573

350

self.changedstate.acquire()

351

self.changedstate.notify_all()

352

self.changedstate.release()

353

574

354

def enable(self):

575

355

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

576

356

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

577

357

# Already enabled

578

358

return

579

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

580

self.enabled = True

359

self.send_changedstate()

581

360

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):

609

361

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

610

362

# and every interval from then on.

611

if self.checker_initiator_tag is not None:

612

gobject.source_remove(self.checker_initiator_tag)

613

363

self.checker_initiator_tag = (gobject.timeout_add

614

364

(self.interval_milliseconds(),

615

365

self.start_checker))

616

366

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

617

if self.disable_initiator_tag is not None:

618

gobject.source_remove(self.disable_initiator_tag)

619

367

self.disable_initiator_tag = (gobject.timeout_add

620

368

(self.timeout_milliseconds(),

621

369

self.disable))

370

self.enabled = True

622

371

# Also start a new checker *right now*.

623

372

self.start_checker()

624

373

374

def disable(self, quiet=True):

375

"""Disable this client."""

376

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

377

return False

378

if not quiet:

379

self.send_changedstate()

380

if not quiet:

381

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

382

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

383

gobject.source_remove(self.disable_initiator_tag)

384

self.disable_initiator_tag = None

385

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

386

gobject.source_remove(self.checker_initiator_tag)

387

self.checker_initiator_tag = None

388

self.stop_checker()

389

if self.disable_hook:

390

self.disable_hook(self)

391

self.enabled = False

392

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

393

return False

394

395

def __del__(self):

396

self.disable_hook = None

397

self.disable()

398

625

399

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

626

400

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

627

401

self.checker_callback_tag = None

628

402

self.checker = None

629

403

if os.WIFEXITED(condition):

630

self.last_checker_status = os.WEXITSTATUS(condition)

631

if self.last_checker_status == 0:

404

exitstatus = os.WEXITSTATUS(condition)

405

if exitstatus == 0:

632

406

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

633

407

vars(self))

634

408

self.checked_ok()

636

410

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

637

411

vars(self))

638

412

else:

639

self.last_checker_status = -1

640

413

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

641

414

vars(self))

642

415

643

416

def checked_ok(self):

644

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

417

"""Bump up the timeout for this client.

418

419

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

420

alive and well.

421

"""

645

422

self.last_checked_ok = datetime.datetime.utcnow()

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

423

gobject.source_remove(self.disable_initiator_tag)

424

self.disable_initiator_tag = (gobject.timeout_add

425

(self.timeout_milliseconds(),

426

self.disable))

661

427

662

428

def need_approval(self):

663

429

self.last_approval_request = datetime.datetime.utcnow()

668

434

If a checker already exists, leave it running and do

669

435

nothing."""

670

436

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

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

437

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

438

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

439

# client would inevitably timeout, since no checker would get

440

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

675

441

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

676

442

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

677

443

# should be.

679

445

# If a checker exists, make sure it is not a zombie

680

446

try:

681

447

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

682

except (AttributeError, OSError) as error:

448

except (AttributeError, OSError), error:

683

449

if (isinstance(error, OSError)

684

450

and error.errno != errno.ECHILD):

685

451

raise error

691

457

self.current_checker_command)

692

458

# Start a new checker if needed

693

459

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)

699

460

try:

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

461

# In case checker_command has exactly one % operator

462

command = self.checker_command % self.host

463

except TypeError:

464

# Escape attributes for the shell

465

escaped_attrs = dict(

466

(attr,

467

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

468

errors=

469

'replace')))

470

for attr in

471

self.runtime_expansions)

472

473

try:

474

command = self.checker_command % escaped_attrs

475

except TypeError, error:

476

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

477

' %s', self.checker_command, error)

478

return True # Try again later

705

479

self.current_checker_command = command

706

480

try:

707

481

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

713

487

self.checker = subprocess.Popen(command,

714

488

close_fds=True,

715

489

shell=True, cwd="/")

716

except OSError as 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)

490

self.checker_callback_tag = (gobject.child_watch_add

491

(self.checker.pid,

492

self.checker_callback,

493

data=command))

494

# The checker may have completed before the gobject

495

# watch was added. Check for this.

496

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

497

if pid:

498

gobject.source_remove(self.checker_callback_tag)

499

self.checker_callback(pid, status, command)

500

except OSError, error:

501

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

502

error)

729

503

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

730

504

return True

731

505

738

512

return

739

513

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

740

514

try:

741

self.checker.terminate()

515

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

742

516

#time.sleep(0.5)

743

517

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

744

# self.checker.kill()

745

except OSError as error:

518

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

519

except OSError, error:

746

520

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

747

521

raise

748

522

self.checker = None

749

523

750

751

524

def dbus_service_property(dbus_interface, signature="v",

752

525

access="readwrite", byte_arrays=False):

753

526

"""Decorators for marking methods of a DBusObjectWithProperties to

764

537

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

765

538

if byte_arrays and signature != "ay":

766

539

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

767

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

540

" signature %r" % signature)

768

541

def decorator(func):

769

542

func._dbus_is_property = True

770

543

func._dbus_interface = dbus_interface

778

551

return decorator

779

552

780

553

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

818

554

class DBusPropertyException(dbus.exceptions.DBusException):

819

555

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

820

556

"""

836

572

837

573

class DBusObjectWithProperties(dbus.service.Object):

838

574

"""A D-Bus object with properties.

839

575

840

576

Classes inheriting from this can use the dbus_service_property

841

577

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

842

578

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

843

579

"""

844

580

845

581

@staticmethod

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)

582

def _is_dbus_property(obj):

583

return getattr(obj, "_dbus_is_property", False)

854

584

855

def _get_all_dbus_things(self, thing):

585

def _get_all_dbus_properties(self):

856

586

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

857

587

"""

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)))

588

return ((prop._dbus_name, prop)

589

for name, prop in

590

inspect.getmembers(self, self._is_dbus_property))

865

591

866

592

def _get_dbus_property(self, interface_name, property_name):

867

593

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

868

594

property with the specified name and interface.

869

595

"""

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

596

for name in (property_name,

597

property_name + "_dbus_property"):

598

prop = getattr(self, name, None)

599

if (prop is None

600

or not self._is_dbus_property(prop)

601

or prop._dbus_name != property_name

602

or (interface_name and prop._dbus_interface

603

and interface_name != prop._dbus_interface)):

604

continue

605

return prop

878

606

# No such property

879

607

raise DBusPropertyNotFound(self.dbus_object_path + ":"

880

608

+ interface_name + "."

905

633

# signatures other than "ay".

906

634

if prop._dbus_signature != "ay":

907

635

raise ValueError

908

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

909

for byte in value))

636

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

637

for byte in value))

910

638

prop(value)

911

639

912

640

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

914

642

def GetAll(self, interface_name):

915

643

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

916

644

standard.

917

645

918

646

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

919

647

"""

920

properties = {}

921

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

648

all = {}

649

for name, prop in self._get_all_dbus_properties():

922

650

if (interface_name

923

651

and interface_name != prop._dbus_interface):

924

652

# Interface non-empty but did not match

928

656

continue

929

657

value = prop()

930

658

if not hasattr(value, "variant_level"):

931

properties[name] = value

659

all[name] = value

932

660

continue

933

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

934

value.variant_level+1)

935

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

661

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

662

value.variant_level+1)

663

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

936

664

937

665

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

938

666

out_signature="s",

939

667

path_keyword='object_path',

940

668

connection_keyword='connection')

941

669

def Introspect(self, object_path, connection):

942

"""Overloading of standard D-Bus method.

943

944

Inserts property tags and interface annotation tags.

670

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

945

671

"""

946

672

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

947

673

connection)

954

680

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

955

681

return e

956

682

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

957

# Add property tags

958

683

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

959

684

for name, prop

960

in self._get_all_dbus_things("property")

685

in self._get_all_dbus_properties()

961

686

if prop._dbus_interface

962

687

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

963

688

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)

995

689

# Add the names to the return values for the

996

690

# "org.freedesktop.DBus.Properties" methods

997

691

if (if_tag.getAttribute("name")

1010

704

xmlstring = document.toxml("utf-8")

1011

705

document.unlink()

1012

706

except (AttributeError, xml.dom.DOMException,

1013

xml.parsers.expat.ExpatError) as error:

707

xml.parsers.expat.ExpatError), error:

1014

708

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

1015

exc_info=error)

709

error)

1016

710

return xmlstring

1017

711

1018

712

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"})

1198

713

class ClientDBus(Client, DBusObjectWithProperties):

1199

714

"""A Client class using D-Bus

1200

715

1209

724

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

1210

725

1211

726

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

727

self._approvals_pending = 0

1212

728

self.bus = bus

1213

729

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

1214

730

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

1220

736

("/clients/" + client_object_name))

1221

737

DBusObjectWithProperties.__init__(self, self.bus,

1222

738

self.dbus_object_path)

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

739

740

def _get_approvals_pending(self):

741

return self._approvals_pending

742

def _set_approvals_pending(self, value):

743

old_value = self._approvals_pending

744

self._approvals_pending = value

745

bval = bool(value)

746

if (hasattr(self, "dbus_object_path")

747

and bval is not bool(old_value)):

748

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

749

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

750

dbus_bool)

751

752

approvals_pending = property(_get_approvals_pending,

753

_set_approvals_pending)

754

del _get_approvals_pending, _set_approvals_pending

755

756

@staticmethod

757

def _datetime_to_dbus(dt, variant_level=0):

758

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

759

return dbus.String(dt.isoformat(),

760

variant_level=variant_level)

761

762

def enable(self):

763

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

764

r = Client.enable(self)

765

if oldstate != self.enabled:

766

# Emit D-Bus signals

767

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

768

dbus.Boolean(True, variant_level=1))

769

self.PropertyChanged(

770

dbus.String("LastEnabled"),

771

self._datetime_to_dbus(self.last_enabled,

772

variant_level=1))

773

return r

774

775

def disable(self, quiet = False):

776

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

777

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

778

if not quiet and oldstate != self.enabled:

779

# Emit D-Bus signal

780

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

781

dbus.Boolean(False, variant_level=1))

782

return r

1291

783

1292

784

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

1293

785

try:

1302

794

*args, **kwargs):

1303

795

self.checker_callback_tag = None

1304

796

self.checker = None

797

# Emit D-Bus signal

798

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

799

dbus.Boolean(False, variant_level=1))

1305

800

if os.WIFEXITED(condition):

1306

801

exitstatus = os.WEXITSTATUS(condition)

1307

802

# Emit D-Bus signal

1317

812

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

1318

813

*args, **kwargs)

1319

814

815

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

816

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

817

# Emit D-Bus signal

818

self.PropertyChanged(

819

dbus.String("LastCheckedOK"),

820

(self._datetime_to_dbus(self.last_checked_ok,

821

variant_level=1)))

822

return r

823

824

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

825

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

826

# Emit D-Bus signal

827

self.PropertyChanged(

828

dbus.String("LastApprovalRequest"),

829

(self._datetime_to_dbus(self.last_approval_request,

830

variant_level=1)))

831

return r

832

1320

833

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

1321

834

old_checker = self.checker

1322

835

if self.checker is not None:

1329

842

and old_checker_pid != self.checker.pid):

1330

843

# Emit D-Bus signal

1331

844

self.CheckerStarted(self.current_checker_command)

845

self.PropertyChanged(

846

dbus.String("CheckerRunning"),

847

dbus.Boolean(True, variant_level=1))

1332

848

return r

1333

849

850

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

851

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

852

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

853

if (old_checker is not None

854

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

855

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

856

dbus.Boolean(False, variant_level=1))

857

return r

858

1334

859

def _reset_approved(self):

1335

self.approved = None

860

self._approved = None

1336

861

return False

1337

862

1338

863

def approve(self, value=True):

1339

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

864

self.send_changedstate()

865

self._approved = value

866

gobject.timeout_add(self._timedelta_to_milliseconds

1341

867

(self.approval_duration),

1342

868

self._reset_approved)

1343

self.send_changedstate()

869

1344

870

1345

871

## D-Bus methods, signals & properties

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"}

872

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

1354

873

1355

874

## Signals

1356

875

1403

922

# CheckedOK - method

1404

923

@dbus.service.method(_interface)

1405

924

def CheckedOK(self):

1406

self.checked_ok()

925

return self.checked_ok()

1407

926

1408

927

# Enable - method

1409

928

@dbus.service.method(_interface)

1442

961

if value is None: # get

1443

962

return dbus.Boolean(self.approved_by_default)

1444

963

self.approved_by_default = bool(value)

964

# Emit D-Bus signal

965

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

966

dbus.Boolean(value, variant_level=1))

1445

967

1446

968

# ApprovalDelay - property

1447

969

@dbus_service_property(_interface, signature="t",

1450

972

if value is None: # get

1451

973

return dbus.UInt64(self.approval_delay_milliseconds())

1452

974

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

975

# Emit D-Bus signal

976

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

977

dbus.UInt64(value, variant_level=1))

1453

978

1454

979

# ApprovalDuration - property

1455

980

@dbus_service_property(_interface, signature="t",

1456

981

access="readwrite")

1457

982

def ApprovalDuration_dbus_property(self, value=None):

1458

983

if value is None: # get

1459

return dbus.UInt64(timedelta_to_milliseconds(

984

return dbus.UInt64(self._timedelta_to_milliseconds(

1460

985

self.approval_duration))

1461

986

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

987

# Emit D-Bus signal

988

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

989

dbus.UInt64(value, variant_level=1))

1462

990

1463

991

# Name - property

1464

992

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

1476

1004

def Host_dbus_property(self, value=None):

1477

1005

if value is None: # get

1478

1006

return dbus.String(self.host)

1479

self.host = unicode(value)

1007

self.host = value

1008

# Emit D-Bus signal

1009

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

1010

dbus.String(value, variant_level=1))

1480

1011

1481

1012

# Created - property

1482

1013

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

1483

1014

def Created_dbus_property(self):

1484

return datetime_to_dbus(self.created)

1015

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

1485

1016

1486

1017

# LastEnabled - property

1487

1018

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

1488

1019

def LastEnabled_dbus_property(self):

1489

return datetime_to_dbus(self.last_enabled)

1020

if self.last_enabled is None:

1021

return dbus.String("")

1022

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

1490

1023

1491

1024

# Enabled - property

1492

1025

@dbus_service_property(_interface, signature="b",

1506

1039

if value is not None:

1507

1040

self.checked_ok()

1508

1041

return

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)

1042

if self.last_checked_ok is None:

1043

return dbus.String("")

1044

return dbus.String(self._datetime_to_dbus(self

1045

.last_checked_ok))

1521

1046

1522

1047

# LastApprovalRequest - property

1523

1048

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

1524

1049

def LastApprovalRequest_dbus_property(self):

1525

return datetime_to_dbus(self.last_approval_request)

1050

if self.last_approval_request is None:

1051

return dbus.String("")

1052

return dbus.String(self.

1053

_datetime_to_dbus(self

1054

.last_approval_request))

1526

1055

1527

1056

# Timeout - property

1528

1057

@dbus_service_property(_interface, signature="t",

1530

1059

def Timeout_dbus_property(self, value=None):

1531

1060

if value is None: # get

1532

1061

return dbus.UInt64(self.timeout_milliseconds())

1533

old_timeout = self.timeout

1534

1062

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

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)

1063

# Emit D-Bus signal

1064

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

1065

dbus.UInt64(value, variant_level=1))

1066

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

1067

return

1068

# Reschedule timeout

1069

gobject.source_remove(self.disable_initiator_tag)

1070

self.disable_initiator_tag = None

1071

time_to_die = (self.

1072

_timedelta_to_milliseconds((self

1073

.last_checked_ok

1074

+ self.timeout)

1075

- datetime.datetime

1076

.utcnow()))

1077

if time_to_die <= 0:

1078

# The timeout has passed

1079

self.disable()

1080

else:

1081

self.disable_initiator_tag = (gobject.timeout_add

1082

(time_to_die, self.disable))

1559

1083

1560

1084

# Interval - property

1561

1085

@dbus_service_property(_interface, signature="t",

1564

1088

if value is None: # get

1565

1089

return dbus.UInt64(self.interval_milliseconds())

1566

1090

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

1091

# Emit D-Bus signal

1092

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

1093

dbus.UInt64(value, variant_level=1))

1567

1094

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

1568

1095

return

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

1096

# Reschedule checker run

1097

gobject.source_remove(self.checker_initiator_tag)

1098

self.checker_initiator_tag = (gobject.timeout_add

1099

(value, self.start_checker))

1100

self.start_checker() # Start one now, too

1101

1576

1102

# Checker - property

1577

1103

@dbus_service_property(_interface, signature="s",

1578

1104

access="readwrite")

1579

1105

def Checker_dbus_property(self, value=None):

1580

1106

if value is None: # get

1581

1107

return dbus.String(self.checker_command)

1582

self.checker_command = unicode(value)

1108

self.checker_command = value

1109

# Emit D-Bus signal

1110

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

1111

dbus.String(self.checker_command,

1112

variant_level=1))

1583

1113

1584

1114

# CheckerRunning - property

1585

1115

@dbus_service_property(_interface, signature="b",

1612

1142

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

1613

1143

if not self._pipe.recv():

1614

1144

raise KeyError()

1615

1145

1616

1146

def __getattribute__(self, name):

1617

if name == '_pipe':

1147

if(name == '_pipe'):

1618

1148

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

1619

1149

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

1620

1150

data = self._pipe.recv()

1625

1155

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

1626

1156

return self._pipe.recv()[1]

1627

1157

return func

1628

1158

1629

1159

def __setattr__(self, name, value):

1630

if name == '_pipe':

1160

if(name == '_pipe'):

1631

1161

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

1632

1162

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

1633

1163

1644

1174

unicode(self.client_address))

1645

1175

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

1646

1176

self.server.child_pipe.fileno())

1647

1177

1648

1178

session = (gnutls.connection

1649

1179

.ClientSession(self.request,

1650

1180

gnutls.connection

1651

1181

.X509Credentials()))

1652

1182

1653

1183

# Note: gnutls.connection.X509Credentials is really a

1654

1184

# generic GnuTLS certificate credentials object so long as

1655

1185

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

1656

1186

# here despite using OpenPGP certificates.

1657

1187

1658

1188

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

1659

1189

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

1660

1190

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

1666

1196

(gnutls.library.functions

1667

1197

.gnutls_priority_set_direct(session._c_object,

1668

1198

priority, None))

1669

1199

1670

1200

# Start communication using the Mandos protocol

1671

1201

# Get protocol number

1672

1202

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

1674

1204

try:

1675

1205

if int(line.strip().split()[0]) > 1:

1676

1206

raise RuntimeError

1677

except (ValueError, IndexError, RuntimeError) as error:

1207

except (ValueError, IndexError, RuntimeError), error:

1678

1208

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

1679

1209

return

1680

1210

1681

1211

# Start GnuTLS connection

1682

1212

try:

1683

1213

session.handshake()

1684

except gnutls.errors.GNUTLSError as error:

1214

except gnutls.errors.GNUTLSError, error:

1685

1215

logger.warning("Handshake failed: %s", error)

1686

1216

# Do not run session.bye() here: the session is not

1687

1217

# established. Just abandon the request.

1688

1218

return

1689

1219

logger.debug("Handshake succeeded")

1690

1220

1691

1221

approval_required = False

1692

1222

try:

1693

1223

try:

1694

1224

fpr = self.fingerprint(self.peer_certificate

1695

1225

(session))

1696

except (TypeError,

1697

gnutls.errors.GNUTLSError) as error:

1226

except (TypeError, gnutls.errors.GNUTLSError), error:

1698

1227

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

1699

1228

return

1700

1229

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

1701

1230

1702

1231

try:

1703

1232

client = ProxyClient(child_pipe, fpr,

1704

1233

self.client_address)

1712

1241

1713

1242

while True:

1714

1243

if not client.enabled:

1715

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

1244

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

1716

1245

client.name)

1717

1246

if self.server.use_dbus:

1718

1247

# Emit D-Bus signal

1719

client.Rejected("Disabled")

1248

client.Rejected("Disabled")

1720

1249

return

1721

1250

1722

if client.approved or not client.approval_delay:

1251

if client._approved or not client.approval_delay:

1723

1252

#We are approved or approval is disabled

1724

1253

break

1725

elif client.approved is None:

1254

elif client._approved is None:

1726

1255

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

1727

1256

client.name)

1728

1257

if self.server.use_dbus:

1739

1268

return

1740

1269

1741

1270

#wait until timeout or approved

1271

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

1742

1272

time = datetime.datetime.now()

1743

1273

client.changedstate.acquire()

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1274

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

1747

1275

client.changedstate.release()

1748

1276

time2 = datetime.datetime.now()

1749

1277

if (time2 - time) >= delay:

1764

1292

while sent_size < len(client.secret):

1765

1293

try:

1766

1294

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

1767

except gnutls.errors.GNUTLSError as error:

1768

logger.warning("gnutls send failed",

1769

exc_info=error)

1295

except (gnutls.errors.GNUTLSError), error:

1296

logger.warning("gnutls send failed")

1770

1297

return

1771

1298

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

1772

1299

sent, len(client.secret)

1773

1300

- (sent_size + sent))

1774

1301

sent_size += sent

1775

1302

1776

1303

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

1777

# bump the timeout using extended_timeout

1778

client.bump_timeout(client.extended_timeout)

1304

# bump the timeout as if seen

1305

client.checked_ok()

1779

1306

if self.server.use_dbus:

1780

1307

# Emit D-Bus signal

1781

1308

client.GotSecret()

1785

1312

client.approvals_pending -= 1

1786

1313

try:

1787

1314

session.bye()

1788

except gnutls.errors.GNUTLSError as error:

1789

logger.warning("GnuTLS bye failed",

1790

exc_info=error)

1315

except (gnutls.errors.GNUTLSError), error:

1316

logger.warning("GnuTLS bye failed")

1791

1317

1792

1318

@staticmethod

1793

1319

def peer_certificate(session):

1849

1375

# Convert the buffer to a Python bytestring

1850

1376

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

1851

1377

# Convert the bytestring to hexadecimal notation

1852

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

1378

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

1853

1379

return hex_fpr

1854

1380

1855

1381

1858

1384

def sub_process_main(self, request, address):

1859

1385

try:

1860

1386

self.finish_request(request, address)

1861

except Exception:

1387

except:

1862

1388

self.handle_error(request, address)

1863

1389

self.close_request(request)

1864

1390

1865

1391

def process_request(self, request, address):

1866

1392

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

1867

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

1868

args = (request, address))

1869

proc.start()

1870

return proc

1871

1393

multiprocessing.Process(target = self.sub_process_main,

1394

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

1872

1395

1873

1396

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1874

1397

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

1878

1401

This function creates a new pipe in self.pipe

1879

1402

"""

1880

1403

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1881

1882

proc = MultiprocessingMixIn.process_request(self, request,

1883

client_address)

1404

1405

super(MultiprocessingMixInWithPipe,

1406

self).process_request(request, client_address)

1884

1407

self.child_pipe.close()

1885

self.add_pipe(parent_pipe, proc)

1886

1887

def add_pipe(self, parent_pipe, proc):

1408

self.add_pipe(parent_pipe)

1409

1410

def add_pipe(self, parent_pipe):

1888

1411

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

1889

raise NotImplementedError

1890

1412

pass

1891

1413

1892

1414

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1893

1415

socketserver.TCPServer, object):

1899

1421

use_ipv6: Boolean; to use IPv6 or not

1900

1422

"""

1901

1423

def __init__(self, server_address, RequestHandlerClass,

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

"""

1424

interface=None, use_ipv6=True):

1906

1425

self.interface = interface

1907

1426

if use_ipv6:

1908

1427

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.

1935

1428

socketserver.TCPServer.__init__(self, server_address,

1936

1429

RequestHandlerClass)

1937

1938

1430

def server_bind(self):

1939

1431

"""This overrides the normal server_bind() function

1940

1432

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

1950

1442

SO_BINDTODEVICE,

1951

1443

str(self.interface

1952

1444

+ '\0'))

1953

except socket.error as error:

1954

if error.errno == errno.EPERM:

1445

except socket.error, error:

1446

if error[0] == errno.EPERM:

1955

1447

logger.error("No permission to"

1956

1448

" bind to interface %s",

1957

1449

self.interface)

1958

elif error.errno == errno.ENOPROTOOPT:

1450

elif error[0] == errno.ENOPROTOOPT:

1959

1451

logger.error("SO_BINDTODEVICE not available;"

1960

1452

" cannot bind to interface %s",

1961

1453

self.interface)

1962

elif error.errno == errno.ENODEV:

1963

logger.error("Interface %s does not"

1964

" exist, cannot bind",

1965

self.interface)

1966

1454

else:

1967

1455

raise

1968

1456

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

1998

1486

"""

1999

1487

def __init__(self, server_address, RequestHandlerClass,

2000

1488

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

2001

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

1489

gnutls_priority=None, use_dbus=True):

2002

1490

self.enabled = False

2003

1491

self.clients = clients

2004

1492

if self.clients is None:

2005

self.clients = {}

1493

self.clients = set()

2006

1494

self.use_dbus = use_dbus

2007

1495

self.gnutls_priority = gnutls_priority

2008

1496

IPv6_TCPServer.__init__(self, server_address,

2009

1497

RequestHandlerClass,

2010

1498

interface = interface,

2011

use_ipv6 = use_ipv6,

2012

socketfd = socketfd)

1499

use_ipv6 = use_ipv6)

2013

1500

def server_activate(self):

2014

1501

if self.enabled:

2015

1502

return socketserver.TCPServer.server_activate(self)

2016

2017

1503

def enable(self):

2018

1504

self.enabled = True

2019

2020

def add_pipe(self, parent_pipe, proc):

1505

def add_pipe(self, parent_pipe):

2021

1506

# Call "handle_ipc" for both data and EOF events

2022

1507

gobject.io_add_watch(parent_pipe.fileno(),

2023

1508

gobject.IO_IN | gobject.IO_HUP,

2024

1509

functools.partial(self.handle_ipc,

2025

parent_pipe =

2026

parent_pipe,

2027

proc = proc))

2028

1510

parent_pipe = parent_pipe))

1511

2029

1512

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

2030

proc = None, client_object=None):

2031

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

2032

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

2033

# Wait for other process to exit

2034

proc.join()

1513

client_object=None):

1514

condition_names = {

1515

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

1516

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

1517

# blocking).

1518

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

1519

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

1520

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

1521

# broken, usually for pipes and

1522

# sockets).

1523

}

1524

conditions_string = ' | '.join(name

1525

for cond, name in

1526

condition_names.iteritems()

1527

if cond & condition)

1528

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

1529

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

2035

1530

return False

2036

1531

2037

1532

# Read a request from the child

2042

1537

fpr = request[1]

2043

1538

address = request[2]

2044

1539

2045

for c in self.clients.itervalues():

1540

for c in self.clients:

2046

1541

if c.fingerprint == fpr:

2047

1542

client = c

2048

1543

break

2049

1544

else:

2050

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

2051

"dress: %s", fpr, address)

1545

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

1546

"dress: %s", fpr, address)

2052

1547

if self.use_dbus:

2053

1548

# Emit D-Bus signal

2054

mandos_dbus_service.ClientNotFound(fpr,

2055

address[0])

1549

mandos_dbus_service.ClientNotFound(fpr, address[0])

2056

1550

parent_pipe.send(False)

2057

1551

return False

2058

1552

2059

1553

gobject.io_add_watch(parent_pipe.fileno(),

2060

1554

gobject.IO_IN | gobject.IO_HUP,

2061

1555

functools.partial(self.handle_ipc,

2062

parent_pipe =

2063

parent_pipe,

2064

proc = proc,

2065

client_object =

2066

client))

1556

parent_pipe = parent_pipe,

1557

client_object = client))

2067

1558

parent_pipe.send(True)

2068

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

2069

# same fileno

1559

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

2070

1560

return False

2071

1561

if command == 'funcall':

2072

1562

funcname = request[1]

2073

1563

args = request[2]

2074

1564

kwargs = request[3]

2075

1565

2076

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

2077

funcname)(*args,

2078

**kwargs)))

2079

1566

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

1567

2080

1568

if command == 'getattr':

2081

1569

attrname = request[1]

2082

1570

if callable(client_object.__getattribute__(attrname)):

2083

1571

parent_pipe.send(('function',))

2084

1572

else:

2085

parent_pipe.send(('data', client_object

2086

.__getattribute__(attrname)))

1573

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

2087

1574

2088

1575

if command == 'setattr':

2089

1576

attrname = request[1]

2090

1577

value = request[2]

2091

1578

setattr(client_object, attrname, value)

2092

1579

2093

1580

return True

2094

1581

2095

1582

2125

1612

elif suffix == "w":

2126

1613

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

2127

1614

else:

2128

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

2129

.format(suffix))

2130

except (ValueError, IndexError) as e:

2131

raise ValueError(*(e.args))

1615

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

1616

except (ValueError, IndexError), e:

1617

raise ValueError(e.message)

2132

1618

timevalue += delta

2133

1619

return timevalue

2134

1620

2135

1621

1622

def if_nametoindex(interface):

1623

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

1624

1625

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

1626

global if_nametoindex

1627

try:

1628

if_nametoindex = (ctypes.cdll.LoadLibrary

1629

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

1630

.if_nametoindex)

1631

except (OSError, AttributeError):

1632

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

1633

def if_nametoindex(interface):

1634

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

1635

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

1636

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

1637

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1638

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

1639

interface))

1640

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

1641

ifreq[16:20])[0]

1642

return interface_index

1643

return if_nametoindex(interface)

1644

1645

2136

1646

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

2137

1647

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

2138

1648

2146

1656

sys.exit()

2147

1657

if not noclose:

2148

1658

# Close all standard open file descriptors

2149

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

1659

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

2150

1660

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

2151

1661

raise OSError(errno.ENODEV,

2152

"{0} not a character device"

2153

.format(os.devnull))

1662

"%s not a character device"

1663

% os.path.devnull)

2154

1664

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

2155

1665

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

2156

1666

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

2163

1673

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

2164

1674

# Parsing of options, both command line and config file

2165

1675

2166

parser = argparse.ArgumentParser()

2167

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

2168

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

2169

help="show version number and exit")

2170

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

2171

help="Bind to interface IF")

2172

parser.add_argument("-a", "--address",

2173

help="Address to listen for requests on")

2174

parser.add_argument("-p", "--port", type=int,

2175

help="Port number to receive requests on")

2176

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

2177

help="Run self-test")

2178

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

2179

help="Debug mode; run in foreground and log"

2180

" to terminal")

2181

parser.add_argument("--debuglevel", metavar="LEVEL",

2182

help="Debug level for stdout output")

2183

parser.add_argument("--priority", help="GnuTLS"

2184

" priority string (see GnuTLS documentation)")

2185

parser.add_argument("--servicename",

2186

metavar="NAME", help="Zeroconf service name")

2187

parser.add_argument("--configdir",

2188

default="/etc/mandos", metavar="DIR",

2189

help="Directory to search for configuration"

2190

" files")

2191

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

2192

dest="use_dbus", help="Do not provide D-Bus"

2193

" system bus interface")

2194

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

2195

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

2196

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

2197

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

2198

" state")

2199

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

2200

help="Specify a file descriptor to a network"

2201

" socket to use instead of creating one")

2202

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

2203

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

2204

2205

options = parser.parse_args()

1676

parser = optparse.OptionParser(version = "%%prog %s" % version)

1677

parser.add_option("-i", "--interface", type="string",

1678

metavar="IF", help="Bind to interface IF")

1679

parser.add_option("-a", "--address", type="string",

1680

help="Address to listen for requests on")

1681

parser.add_option("-p", "--port", type="int",

1682

help="Port number to receive requests on")

1683

parser.add_option("--check", action="store_true",

1684

help="Run self-test")

1685

parser.add_option("--debug", action="store_true",

1686

help="Debug mode; run in foreground and log to"

1687

" terminal")

1688

parser.add_option("--debuglevel", type="string", metavar="LEVEL",

1689

help="Debug level for stdout output")

1690

parser.add_option("--priority", type="string", help="GnuTLS"

1691

" priority string (see GnuTLS documentation)")

1692

parser.add_option("--servicename", type="string",

1693

metavar="NAME", help="Zeroconf service name")

1694

parser.add_option("--configdir", type="string",

1695

default="/etc/mandos", metavar="DIR",

1696

help="Directory to search for configuration"

1697

" files")

1698

parser.add_option("--no-dbus", action="store_false",

1699

dest="use_dbus", help="Do not provide D-Bus"

1700

" system bus interface")

1701

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

1702

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

1703

options = parser.parse_args()[0]

2206

1704

2207

1705

if options.check:

2208

1706

import doctest

2220

1718

"use_dbus": "True",

2221

1719

"use_ipv6": "True",

2222

1720

"debuglevel": "",

2223

"restore": "True",

2224

"socket": "",

2225

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

2226

1721

}

2227

1722

2228

1723

# Parse config file for server-global settings

2239

1734

if server_settings["port"]:

2240

1735

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

2241

1736

"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"])

2251

1737

del server_config

2252

1738

2253

1739

# Override the settings from the config file with command line

2254

1740

# options, if set.

2255

1741

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

2256

1742

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

2257

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

2258

"statedir", "socket"):

1743

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

2259

1744

value = getattr(options, option)

2260

1745

if value is not None:

2261

1746

server_settings[option] = value

2273

1758

debuglevel = server_settings["debuglevel"]

2274

1759

use_dbus = server_settings["use_dbus"]

2275

1760

use_ipv6 = server_settings["use_ipv6"]

2276

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

2277

stored_state_file)

2278

2279

if debug:

2280

initlogger(debug, logging.DEBUG)

2281

else:

2282

if not debuglevel:

2283

initlogger(debug)

2284

else:

2285

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

2286

initlogger(debug, level)

2287

1761

2288

1762

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

2289

1763

syslogger.setFormatter(logging.Formatter

2290

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

2291

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

2292

.format(server_settings

2293

["servicename"])))

1764

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

1765

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

1766

% server_settings["servicename"]))

2294

1767

2295

1768

# Parse config file with clients

2296

client_config = configparser.SafeConfigParser(Client

2297

.client_defaults)

1769

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

1770

"interval": "5m",

1771

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

1772

"host": "",

1773

"approval_delay": "0s",

1774

"approval_duration": "1s",

1775

}

1776

client_config = configparser.SafeConfigParser(client_defaults)

2298

1777

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

2299

1778

"clients.conf"))

2300

1779

2309

1788

use_ipv6=use_ipv6,

2310

1789

gnutls_priority=

2311

1790

server_settings["priority"],

2312

use_dbus=use_dbus,

2313

socketfd=(server_settings["socket"]

2314

or None))

1791

use_dbus=use_dbus)

2315

1792

if not debug:

2316

1793

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

2317

1794

try:

2318

1795

pidfile = open(pidfilename, "w")

2319

except IOError as e:

2320

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

2321

exc_info=e)

1796

except IOError:

1797

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

2322

1798

2323

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

1799

try:

1800

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

1801

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

1802

except KeyError:

2324

1803

try:

2325

uid = pwd.getpwnam(name).pw_uid

2326

gid = pwd.getpwnam(name).pw_gid

2327

break

1804

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

1805

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

2328

1806

except KeyError:

2329

continue

2330

else:

2331

uid = 65534

2332

gid = 65534

1807

try:

1808

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

1809

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

1810

except KeyError:

1811

uid = 65534

1812

gid = 65534

2333

1813

try:

2334

1814

os.setgid(gid)

2335

1815

os.setuid(uid)

2336

except OSError as error:

2337

if error.errno != errno.EPERM:

1816

except OSError, error:

1817

if error[0] != errno.EPERM:

2338

1818

raise error

2339

1819

1820

if not debug and not debuglevel:

1821

syslogger.setLevel(logging.WARNING)

1822

console.setLevel(logging.WARNING)

1823

if debuglevel:

1824

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

1825

syslogger.setLevel(level)

1826

console.setLevel(level)

1827

2340

1828

if debug:

2341

1829

# Enable all possible GnuTLS debugging

2342

1830

2352

1840

.gnutls_global_set_log_function(debug_gnutls))

2353

1841

2354

1842

# Redirect stdin so all checkers get /dev/null

2355

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

1843

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

2356

1844

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

2357

1845

if null > 2:

2358

1846

os.close(null)

1847

else:

1848

# No console logging

1849

logger.removeHandler(console)

2359

1850

2360

1851

# Need to fork before connecting to D-Bus

2361

1852

if not debug:

2362

1853

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

2363

1854

daemon()

2364

1855

2365

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

2366

# need to inform gobject that threads will be used.

2367

gobject.threads_init()

2368

2369

1856

global main_loop

2370

1857

# From the Avahi example code

2371

DBusGMainLoop(set_as_default=True)

1858

DBusGMainLoop(set_as_default=True )

2372

1859

main_loop = gobject.MainLoop()

2373

1860

bus = dbus.SystemBus()

2374

1861

# End of Avahi example code

2375

1862

if use_dbus:

2376

1863

try:

2377

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

1864

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

2378

1865

bus, do_not_queue=True)

2379

old_bus_name = (dbus.service.BusName

2380

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

2381

do_not_queue=True))

2382

except dbus.exceptions.NameExistsException as e:

2383

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

1866

except dbus.exceptions.NameExistsException, e:

1867

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

2384

1868

use_dbus = False

2385

1869

server_settings["use_dbus"] = False

2386

1870

tcp_server.use_dbus = False

2387

1871

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2388

service = AvahiServiceToSyslog(name =

2389

server_settings["servicename"],

2390

servicetype = "_mandos._tcp",

2391

protocol = protocol, bus = bus)

1872

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

1873

servicetype = "_mandos._tcp",

1874

protocol = protocol, bus = bus)

2392

1875

if server_settings["interface"]:

2393

1876

service.interface = (if_nametoindex

2394

1877

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

2399

1882

client_class = Client

2400

1883

if use_dbus:

2401

1884

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

2402

2403

client_settings = Client.config_parser(client_config)

2404

old_client_settings = {}

2405

clients_data = {}

2406

2407

# Get client data and settings from last running state.

2408

if server_settings["restore"]:

2409

try:

2410

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

2411

clients_data, old_client_settings = (pickle.load

2412

(stored_state))

2413

os.remove(stored_state_path)

2414

except IOError as e:

2415

if e.errno == errno.ENOENT:

2416

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

2417

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

2418

else:

2419

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

2420

exc_info=e)

2421

raise

2422

except EOFError as e:

2423

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

2424

"EOFError:", exc_info=e)

2425

2426

with PGPEngine() as pgp:

2427

for client_name, client in clients_data.iteritems():

2428

# Decide which value to use after restoring saved state.

2429

# We have three different values: Old config file,

2430

# new config file, and saved state.

2431

# New config value takes precedence if it differs from old

2432

# config value, otherwise use saved state.

2433

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

2434

try:

2435

# For each value in new config, check if it

2436

# differs from the old config value (Except for

2437

# the "secret" attribute)

2438

if (name != "secret" and

2439

value != old_client_settings[client_name]

2440

[name]):

2441

client[name] = value

2442

except KeyError:

2443

pass

2444

2445

# Clients who has passed its expire date can still be

2446

# enabled if its last checker was successful. Clients

2447

# whose checker succeeded before we stored its state is

2448

# assumed to have successfully run all checkers during

2449

# downtime.

2450

if client["enabled"]:

2451

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

2452

if not client["last_checked_ok"]:

2453

logger.warning(

2454

"disabling client {0} - Client never "

2455

"performed a successful checker"

2456

.format(client_name))

2457

client["enabled"] = False

2458

elif client["last_checker_status"] != 0:

2459

logger.warning(

2460

"disabling client {0} - Client "

2461

"last checker failed with error code {1}"

2462

.format(client_name,

2463

client["last_checker_status"]))

2464

client["enabled"] = False

2465

else:

2466

client["expires"] = (datetime.datetime

2467

.utcnow()

2468

+ client["timeout"])

2469

logger.debug("Last checker succeeded,"

2470

" keeping {0} enabled"

2471

.format(client_name))

1885

def client_config_items(config, section):

1886

special_settings = {

1887

"approved_by_default":

1888

lambda: config.getboolean(section,

1889

"approved_by_default"),

1890

}

1891

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

2472

1892

try:

2473

client["secret"] = (

2474

pgp.decrypt(client["encrypted_secret"],

2475

client_settings[client_name]

2476

["secret"]))

2477

except PGPError:

2478

# If decryption fails, we use secret from new settings

2479

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

2480

.format(client_name))

2481

client["secret"] = (

2482

client_settings[client_name]["secret"])

2483

2484

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

2485

for client_name in (set(old_client_settings)

2486

- set(client_settings)):

2487

del clients_data[client_name]

2488

for client_name in (set(client_settings)

2489

- set(old_client_settings)):

2490

clients_data[client_name] = client_settings[client_name]

2491

2492

# Create all client objects

2493

for client_name, client in clients_data.iteritems():

2494

tcp_server.clients[client_name] = client_class(

2495

name = client_name, settings = client)

2496

1893

yield (name, special_settings[name]())

1894

except KeyError:

1895

yield (name, value)

1896

1897

tcp_server.clients.update(set(

1898

client_class(name = section,

1899

config= dict(client_config_items(

1900

client_config, section)))

1901

for section in client_config.sections()))

2497

1902

if not tcp_server.clients:

2498

1903

logger.warning("No clients defined")

2499

1904

2500

1905

if not debug:

2501

1906

try:

2502

1907

with pidfile:

2510

1915

# "pidfile" was never created

2511

1916

pass

2512

1917

del pidfilename

2513

1918

1919

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

1920

2514

1921

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

2515

1922

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

2516

1923

2517

1924

if use_dbus:

2518

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

2519

"se.bsnet.fukt.Mandos"})

2520

class MandosDBusService(DBusObjectWithProperties):

1925

class MandosDBusService(dbus.service.Object):

2521

1926

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

2522

1927

def __init__(self):

2523

1928

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

2524

_interface = "se.recompile.Mandos"

2525

2526

@dbus_interface_annotations(_interface)

2527

def _foo(self):

2528

return { "org.freedesktop.DBus.Property"

2529

".EmitsChangedSignal":

2530

"false"}

1929

_interface = "se.bsnet.fukt.Mandos"

2531

1930

2532

1931

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

2533

1932

def ClientAdded(self, objpath):

2548

1947

def GetAllClients(self):

2549

1948

"D-Bus method"

2550

1949

return dbus.Array(c.dbus_object_path

2551

for c in

2552

tcp_server.clients.itervalues())

1950

for c in tcp_server.clients)

2553

1951

2554

1952

@dbus.service.method(_interface,

2555

1953

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

2557

1955

"D-Bus method"

2558

1956

return dbus.Dictionary(

2559

1957

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

2560

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

1958

for c in tcp_server.clients),

2561

1959

signature="oa{sv}")

2562

1960

2563

1961

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

2564

1962

def RemoveClient(self, object_path):

2565

1963

"D-Bus method"

2566

for c in tcp_server.clients.itervalues():

1964

for c in tcp_server.clients:

2567

1965

if c.dbus_object_path == object_path:

2568

del tcp_server.clients[c.name]

1966

tcp_server.clients.remove(c)

2569

1967

c.remove_from_connection()

2570

1968

# Don't signal anything except ClientRemoved

2571

1969

c.disable(quiet=True)

2582

1980

"Cleanup function; run on exit"

2583

1981

service.cleanup()

2584

1982

2585

multiprocessing.active_children()

2586

if not (tcp_server.clients or client_settings):

2587

return

2588

2589

# Store client before exiting. Secrets are encrypted with key

2590

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

2591

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

2592

clients = {}

2593

with PGPEngine() as pgp:

2594

for client in tcp_server.clients.itervalues():

2595

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

2596

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

2597

key)

2598

client_dict = {}

2599

2600

# A list of attributes that can not be pickled

2601

# + secret.

2602

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

2603

"checker"))

2604

for name, typ in (inspect.getmembers

2605

(dbus.service.Object)):

2606

exclude.add(name)

2607

2608

client_dict["encrypted_secret"] = (client

2609

.encrypted_secret)

2610

for attr in client.client_structure:

2611

if attr not in exclude:

2612

client_dict[attr] = getattr(client, attr)

2613

2614

clients[client.name] = client_dict

2615

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

2616

2617

try:

2618

with (tempfile.NamedTemporaryFile

2619

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

2620

dir=os.path.dirname(stored_state_path),

2621

delete=False)) as stored_state:

2622

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

2623

tempname=stored_state.name

2624

os.rename(tempname, stored_state_path)

2625

except (IOError, OSError) as e:

2626

if not debug:

2627

try:

2628

os.remove(tempname)

2629

except NameError:

2630

pass

2631

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

2632

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

2633

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

2634

else:

2635

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

2636

exc_info=e)

2637

raise e

2638

2639

# Delete all clients, and settings from config

2640

1983

while tcp_server.clients:

2641

name, client = tcp_server.clients.popitem()

1984

client = tcp_server.clients.pop()

2642

1985

if use_dbus:

2643

1986

client.remove_from_connection()

1987

client.disable_hook = None

2644

1988

# Don't signal anything except ClientRemoved

2645

1989

client.disable(quiet=True)

2646

1990

if use_dbus:

2647

1991

# Emit D-Bus signal

2648

mandos_dbus_service.ClientRemoved(client

2649

.dbus_object_path,

1992

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2650

1993

client.name)

2651

client_settings.clear()

2652

1994

2653

1995

atexit.register(cleanup)

2654

1996

2655

for client in tcp_server.clients.itervalues():

1997

for client in tcp_server.clients:

2656

1998

if use_dbus:

2657

1999

# Emit D-Bus signal

2658

2000

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2659

# Need to initiate checking of clients

2660

if client.enabled:

2661

client.init_checker()

2001

client.enable()

2662

2002

2663

2003

tcp_server.enable()

2664

2004

tcp_server.server_activate()

2667

2007

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

2668

2008

if use_ipv6:

2669

2009

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

2670

" flowinfo %d, scope_id %d",

2671

*tcp_server.socket.getsockname())

2010

" flowinfo %d, scope_id %d"

2011

% tcp_server.socket.getsockname())

2672

2012

else: # IPv4

2673

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

2674

*tcp_server.socket.getsockname())

2013

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

2014

% tcp_server.socket.getsockname())

2675

2015

2676

2016

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

2677

2017

2679

2019

# From the Avahi example code

2680

2020

try:

2681

2021

service.activate()

2682

except dbus.exceptions.DBusException as error:

2683

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

2022

except dbus.exceptions.DBusException, error:

2023

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

2684

2024

cleanup()

2685

2025

sys.exit(1)

2686

2026

# End of Avahi example code

2692

2032

2693

2033

logger.debug("Starting main loop")

2694

2034

main_loop.run()

2695

except AvahiError as error:

2696

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

2035

except AvahiError, error:

2036

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

2697

2037

cleanup()

2698

2038

sys.exit(1)

2699

2039

except KeyboardInterrupt: