/mandos/trunk : revision 505.3.22

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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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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 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 = "1.5.3"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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version = "1.4.1"

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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.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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.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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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 = 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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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: {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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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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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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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_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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extended_timeout: extra long timeout when password 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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"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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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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return _timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return _timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return _timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

476

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

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value given the same arguments.

478

"""

479

settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

493

if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

500

else:

501

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

502

.format(section))

503

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

504

client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

512

client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

517

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

332

return _timedelta_to_milliseconds(self.approval_delay)

333

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

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

336

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

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attribute."""

519

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self.name = name

520

# adding all client settings

521

for setting, value in settings.iteritems():

522

setattr(self, setting, value)

523

524

if self.enabled:

525

if not hasattr(self, "last_enabled"):

526

self.last_enabled = datetime.datetime.utcnow()

527

if not hasattr(self, "expires"):

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

529

+ self.timeout)

530

else:

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self.last_enabled = None

532

self.expires = None

533

339

if config is None:

340

config = {}

534

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

535

342

# Uppercase and remove spaces from fingerprint for later

536

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# comparison purposes with return value from the fingerprint()

537

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# function

345

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

346

.replace(" ", ""))

538

347

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

539

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

540

datetime.datetime.utcnow())

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542

# attributes specific for this server instance

348

if "secret" in config:

349

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

350

elif "secfile" in config:

351

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

352

(config["secfile"])),

353

"rb") as secfile:

354

self.secret = secfile.read()

355

else:

356

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

357

% self.name)

358

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

359

self.created = datetime.datetime.utcnow()

360

self.enabled = False

361

self.last_approval_request = None

362

self.last_enabled = None

363

self.last_checked_ok = None

364

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

365

self.extended_timeout = string_to_delta(config

366

["extended_timeout"])

367

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

368

self.disable_hook = disable_hook

543

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self.checker = None

544

370

self.checker_initiator_tag = None

545

371

self.disable_initiator_tag = None

372

self.expires = None

546

373

self.checker_callback_tag = None

374

self.checker_command = config["checker"]

547

375

self.current_checker_command = None

548

self.approved = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

549

380

self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

384

config["approval_duration"])

550

385

self.changedstate = (multiprocessing_manager

551

386

.Condition(multiprocessing_manager

552

387

.Lock()))

553

self.client_structure = [attr for attr in

554

self.__dict__.iterkeys()

555

if not attr.startswith("_")]

556

self.client_structure.append("client_structure")

557

558

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

559

lambda obj:

560

isinstance(obj,

561

property)):

562

if not name.startswith("_"):

563

self.client_structure.append(name)

564

388

565

# Send notice to process children that client state has changed

566

389

def send_changedstate(self):

567

with self.changedstate:

568

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

569

393

570

394

def enable(self):

571

395

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

572

396

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

573

397

# Already enabled

574

398

return

575

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

576

self.enabled = True

577

self.last_enabled = datetime.datetime.utcnow()

578

self.init_checker()

579

399

self.send_changedstate()

580

581

def disable(self, quiet=True):

582

"""Disable this client."""

583

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

584

return False

585

if not quiet:

586

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

587

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

588

gobject.source_remove(self.disable_initiator_tag)

589

self.disable_initiator_tag = None

590

self.expires = None

591

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

592

gobject.source_remove(self.checker_initiator_tag)

593

self.checker_initiator_tag = None

594

self.stop_checker()

595

self.enabled = False

596

if not quiet:

597

self.send_changedstate()

598

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

599

return False

600

601

def __del__(self):

602

self.disable()

603

604

def init_checker(self):

605

400

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

606

401

# and every interval from then on.

607

if self.checker_initiator_tag is not None:

608

gobject.source_remove(self.checker_initiator_tag)

609

402

self.checker_initiator_tag = (gobject.timeout_add

610

403

(self.interval_milliseconds(),

611

404

self.start_checker))

612

405

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

613

if self.disable_initiator_tag is not None:

614

gobject.source_remove(self.disable_initiator_tag)

406

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

615

407

self.disable_initiator_tag = (gobject.timeout_add

616

408

(self.timeout_milliseconds(),

617

409

self.disable))

410

self.enabled = True

411

self.last_enabled = datetime.datetime.utcnow()

618

412

# Also start a new checker *right now*.

619

413

self.start_checker()

620

414

415

def disable(self, quiet=True):

416

"""Disable this client."""

417

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

418

return False

419

if not quiet:

420

self.send_changedstate()

421

if not quiet:

422

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

423

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

424

gobject.source_remove(self.disable_initiator_tag)

425

self.disable_initiator_tag = None

426

self.expires = None

427

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

428

gobject.source_remove(self.checker_initiator_tag)

429

self.checker_initiator_tag = None

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

433

self.enabled = False

434

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

435

return False

436

437

def __del__(self):

438

self.disable_hook = None

439

self.disable()

440

621

441

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

622

442

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

623

443

self.checker_callback_tag = None

624

444

self.checker = None

625

445

if os.WIFEXITED(condition):

626

self.last_checker_status = os.WEXITSTATUS(condition)

627

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

628

448

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

629

449

vars(self))

630

450

self.checked_ok()

632

452

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

633

453

vars(self))

634

454

else:

635

self.last_checker_status = -1

636

455

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

637

456

vars(self))

638

457

639

def checked_ok(self):

640

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

641

self.last_checked_ok = datetime.datetime.utcnow()

642

self.last_checker_status = 0

643

self.bump_timeout()

644

645

def bump_timeout(self, timeout=None):

646

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

458

def checked_ok(self, timeout=None):

459

"""Bump up the timeout for this client.

460

461

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

462

alive and well.

463

"""

647

464

if timeout is None:

648

465

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

649

467

if self.disable_initiator_tag is not None:

650

468

gobject.source_remove(self.disable_initiator_tag)

651

self.disable_initiator_tag = None

652

469

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

653

470

self.disable_initiator_tag = (gobject.timeout_add

654

(timedelta_to_milliseconds

471

(_timedelta_to_milliseconds

655

472

(timeout), self.disable))

656

473

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

657

474

664

481

If a checker already exists, leave it running and do

665

482

nothing."""

666

483

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

667

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

668

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

669

# would inevitably timeout, since no checker would get a

670

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

484

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

485

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

486

# client would inevitably timeout, since no checker would get

487

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

671

488

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

672

489

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

673

490

# should be.

703

520

try:

704

521

command = self.checker_command % escaped_attrs

705

522

except TypeError as error:

706

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

707

self.checker_command, exc_info=error)

523

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

524

' %s', self.checker_command, error)

708

525

return True # Try again later

709

526

self.current_checker_command = command

710

527

try:

728

545

gobject.source_remove(self.checker_callback_tag)

729

546

self.checker_callback(pid, status, command)

730

547

except OSError as error:

731

logger.error("Failed to start subprocess",

732

exc_info=error)

548

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

549

error)

733

550

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

734

551

return True

735

552

742

559

return

743

560

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

744

561

try:

745

self.checker.terminate()

562

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

746

563

#time.sleep(0.5)

747

564

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

748

# self.checker.kill()

565

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

749

566

except OSError as error:

750

567

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

751

568

raise

768

585

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

769

586

if byte_arrays and signature != "ay":

770

587

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

771

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

588

" signature %r" % signature)

772

589

def decorator(func):

773

590

func._dbus_is_property = True

774

591

func._dbus_interface = dbus_interface

782

599

return decorator

783

600

784

601

785

def dbus_interface_annotations(dbus_interface):

786

"""Decorator for marking functions returning interface annotations

787

788

Usage:

789

790

@dbus_interface_annotations("org.example.Interface")

791

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

792

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

793

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

794

"false"}

795

"""

796

def decorator(func):

797

func._dbus_is_interface = True

798

func._dbus_interface = dbus_interface

799

func._dbus_name = dbus_interface

800

return func

801

return decorator

802

803

804

def dbus_annotations(annotations):

805

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

806

Usage:

807

808

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

809

access="r")

810

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

811

"org.freedesktop.DBus.Property."

812

"EmitsChangedSignal": "false"})

813

def Property_dbus_property(self):

814

return dbus.Boolean(False)

815

"""

816

def decorator(func):

817

func._dbus_annotations = annotations

818

return func

819

return decorator

820

821

822

602

class DBusPropertyException(dbus.exceptions.DBusException):

823

603

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

824

604

"""

847

627

"""

848

628

849

629

@staticmethod

850

def _is_dbus_thing(thing):

851

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

852

853

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

854

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

855

"""

856

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

857

False)

630

def _is_dbus_property(obj):

631

return getattr(obj, "_dbus_is_property", False)

858

632

859

def _get_all_dbus_things(self, thing):

633

def _get_all_dbus_properties(self):

860

634

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

861

635

"""

862

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

863

name),

864

athing.__get__(self))

636

return ((prop.__get__(self)._dbus_name, prop.__get__(self))

865

637

for cls in self.__class__.__mro__

866

for name, athing in

867

inspect.getmembers(cls,

868

self._is_dbus_thing(thing)))

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

869

640

870

641

def _get_dbus_property(self, interface_name, property_name):

871

642

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

873

644

"""

874

645

for cls in self.__class__.__mro__:

875

646

for name, value in (inspect.getmembers

876

(cls,

877

self._is_dbus_thing("property"))):

647

(cls, self._is_dbus_property)):

878

648

if (value._dbus_name == property_name

879

649

and value._dbus_interface == interface_name):

880

650

return value.__get__(self)

909

679

# signatures other than "ay".

910

680

if prop._dbus_signature != "ay":

911

681

raise ValueError

912

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

913

for byte in value))

682

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

683

for byte in value))

914

684

prop(value)

915

685

916

686

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

921

691

922

692

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

923

693

"""

924

properties = {}

925

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

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

926

696

if (interface_name

927

697

and interface_name != prop._dbus_interface):

928

698

# Interface non-empty but did not match

932

702

continue

933

703

value = prop()

934

704

if not hasattr(value, "variant_level"):

935

properties[name] = value

705

all[name] = value

936

706

continue

937

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

938

value.variant_level+1)

939

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

707

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

708

value.variant_level+1)

709

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

940

710

941

711

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

942

712

out_signature="s",

943

713

path_keyword='object_path',

944

714

connection_keyword='connection')

945

715

def Introspect(self, object_path, connection):

946

"""Overloading of standard D-Bus method.

947

948

Inserts property tags and interface annotation tags.

716

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

949

717

"""

950

718

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

951

719

connection)

958

726

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

959

727

return e

960

728

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

961

# Add property tags

962

729

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

963

730

for name, prop

964

in self._get_all_dbus_things("property")

731

in self._get_all_dbus_properties()

965

732

if prop._dbus_interface

966

733

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

967

734

if_tag.appendChild(tag)

968

# Add annotation tags

969

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

970

for tag in if_tag.getElementsByTagName(typ):

971

annots = dict()

972

for name, prop in (self.

973

_get_all_dbus_things(typ)):

974

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

975

and prop._dbus_interface

976

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

977

annots.update(getattr

978

(prop,

979

"_dbus_annotations",

980

{}))

981

for name, value in annots.iteritems():

982

ann_tag = document.createElement(

983

"annotation")

984

ann_tag.setAttribute("name", name)

985

ann_tag.setAttribute("value", value)

986

tag.appendChild(ann_tag)

987

# Add interface annotation tags

988

for annotation, value in dict(

989

itertools.chain.from_iterable(

990

annotations().iteritems()

991

for name, annotations in

992

self._get_all_dbus_things("interface")

993

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

994

)).iteritems():

995

ann_tag = document.createElement("annotation")

996

ann_tag.setAttribute("name", annotation)

997

ann_tag.setAttribute("value", value)

998

if_tag.appendChild(ann_tag)

999

735

# Add the names to the return values for the

1000

736

# "org.freedesktop.DBus.Properties" methods

1001

737

if (if_tag.getAttribute("name")

1016

752

except (AttributeError, xml.dom.DOMException,

1017

753

xml.parsers.expat.ExpatError) as error:

1018

754

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

1019

exc_info=error)

755

error)

1020

756

return xmlstring

1021

757

1022

758

1027

763

return dbus.String(dt.isoformat(),

1028

764

variant_level=variant_level)

1029

765

1030

1031

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1032

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

1033

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

1034

interface names according to the "alt_interface_names" mapping.

1035

Usage:

1036

1037

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

1038

"net.example.AlternateInterface"})

1039

class SampleDBusObject(dbus.service.Object):

1040

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

1041

def SampleDBusMethod():

1042

pass

1043

1044

The above "SampleDBusMethod" on "SampleDBusObject" will be

1045

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

1046

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

1047

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

1048

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

1049

1050

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

1051

(from DBusObjectWithProperties) and interfaces (from the

1052

dbus_interface_annotations decorator).

766

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

767

.__metaclass__):

768

"""Applied to an empty subclass of a D-Bus object, this metaclass

769

will add additional D-Bus attributes matching a certain pattern.

1053

770

"""

1054

def wrapper(cls):

1055

for orig_interface_name, alt_interface_name in (

1056

alt_interface_names.iteritems()):

1057

attr = {}

1058

interface_names = set()

1059

# Go though all attributes of the class

1060

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

771

def __new__(mcs, name, bases, attr):

772

# Go through all the base classes which could have D-Bus

773

# methods, signals, or properties in them

774

for base in (b for b in bases

775

if issubclass(b, dbus.service.Object)):

776

# Go though all attributes of the base class

777

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

1061

778

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

1062

779

# with the wrong interface name

1063

780

if (not hasattr(attribute, "_dbus_interface")

1064

781

or not attribute._dbus_interface

1065

.startswith(orig_interface_name)):

782

.startswith("se.recompile.Mandos")):

1066

783

continue

1067

784

# Create an alternate D-Bus interface name based on

1068

785

# the current name

1069

786

alt_interface = (attribute._dbus_interface

1070

.replace(orig_interface_name,

1071

alt_interface_name))

1072

interface_names.add(alt_interface)

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1073

789

# Is this a D-Bus signal?

1074

790

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

1075

791

# Extract the original non-method function by

1090

806

nonmethod_func.func_name,

1091

807

nonmethod_func.func_defaults,

1092

808

nonmethod_func.func_closure)))

1093

# Copy annotations, if any

1094

try:

1095

new_function._dbus_annotations = (

1096

dict(attribute._dbus_annotations))

1097

except AttributeError:

1098

pass

1099

809

# Define a creator of a function to call both the

1100

# original and alternate functions, so both the

1101

# original and alternate signals gets sent when

1102

# the function is called

810

# old and new functions, so both the old and new

811

# signals gets sent when the function is called

1103

812

def fixscope(func1, func2):

1104

813

"""This function is a scope container to pass

1105

814

func1 and func2 to the "call_both" function

1112

821

return call_both

1113

822

# Create the "call_both" function and add it to

1114

823

# the class

1115

attr[attrname] = fixscope(attribute, new_function)

824

attr[attrname] = fixscope(attribute,

825

new_function)

1116

826

# Is this a D-Bus method?

1117

827

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

1118

828

# Create a new, but exactly alike, function

1129

839

attribute.func_name,

1130

840

attribute.func_defaults,

1131

841

attribute.func_closure)))

1132

# Copy annotations, if any

1133

try:

1134

attr[attrname]._dbus_annotations = (

1135

dict(attribute._dbus_annotations))

1136

except AttributeError:

1137

pass

1138

842

# Is this a D-Bus property?

1139

843

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

1140

844

# Create a new, but exactly alike, function

1154

858

attribute.func_name,

1155

859

attribute.func_defaults,

1156

860

attribute.func_closure)))

1157

# Copy annotations, if any

1158

try:

1159

attr[attrname]._dbus_annotations = (

1160

dict(attribute._dbus_annotations))

1161

except AttributeError:

1162

pass

1163

# Is this a D-Bus interface?

1164

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

1165

# Create a new, but exactly alike, function

1166

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

1167

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

1168

# to the class.

1169

attr[attrname] = (dbus_interface_annotations

1170

(alt_interface)

1171

(types.FunctionType

1172

(attribute.func_code,

1173

attribute.func_globals,

1174

attribute.func_name,

1175

attribute.func_defaults,

1176

attribute.func_closure)))

1177

if deprecate:

1178

# Deprecate all alternate interfaces

1179

iname="_AlternateDBusNames_interface_annotation{0}"

1180

for interface_name in interface_names:

1181

@dbus_interface_annotations(interface_name)

1182

def func(self):

1183

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

1184

"true" }

1185

# Find an unused name

1186

for aname in (iname.format(i)

1187

for i in itertools.count()):

1188

if aname not in attr:

1189

attr[aname] = func

1190

break

1191

if interface_names:

1192

# Replace the class with a new subclass of it with

1193

# methods, signals, etc. as created above.

1194

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

1195

(cls,), attr)

1196

return cls

1197

return wrapper

1198

1199

1200

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

1201

"se.bsnet.fukt.Mandos"})

861

return type.__new__(mcs, name, bases, attr)

862

1202

863

class ClientDBus(Client, DBusObjectWithProperties):

1203

864

"""A Client class using D-Bus

1204

865

1213

874

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

1214

875

1215

876

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

877

self._approvals_pending = 0

1216

878

self.bus = bus

1217

879

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

1218

880

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

1224

886

("/clients/" + client_object_name))

1225

887

DBusObjectWithProperties.__init__(self, self.bus,

1226

888

self.dbus_object_path)

1227

889

1228

890

def notifychangeproperty(transform_func,

1229

891

dbus_name, type_func=lambda x: x,

1230

892

variant_level=1):

1231

893

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

1232

894

its changes to DBus.

1233

895

1234

896

transform_fun: Function that takes a value and a variant_level

1235

897

and transforms it to a D-Bus type.

1236

898

dbus_name: D-Bus name of the variable

1253

915

1254

916

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

1255

917

918

1256

919

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1257

920

approvals_pending = notifychangeproperty(dbus.Boolean,

1258

921

"ApprovalPending",

1265

928

checker is not None)

1266

929

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1267

930

"LastCheckedOK")

1268

last_checker_status = notifychangeproperty(dbus.Int16,

1269

"LastCheckerStatus")

1270

931

last_approval_request = notifychangeproperty(

1271

932

datetime_to_dbus, "LastApprovalRequest")

1272

933

approved_by_default = notifychangeproperty(dbus.Boolean,

1273

934

"ApprovedByDefault")

1274

approval_delay = notifychangeproperty(dbus.UInt64,

935

approval_delay = notifychangeproperty(dbus.UInt16,

1275

936

"ApprovalDelay",

1276

937

type_func =

1277

timedelta_to_milliseconds)

938

_timedelta_to_milliseconds)

1278

939

approval_duration = notifychangeproperty(

1279

dbus.UInt64, "ApprovalDuration",

1280

type_func = timedelta_to_milliseconds)

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1281

942

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

1282

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

943

timeout = notifychangeproperty(dbus.UInt16, "Timeout",

1283

944

type_func =

1284

timedelta_to_milliseconds)

945

_timedelta_to_milliseconds)

1285

946

extended_timeout = notifychangeproperty(

1286

dbus.UInt64, "ExtendedTimeout",

1287

type_func = timedelta_to_milliseconds)

1288

interval = notifychangeproperty(dbus.UInt64,

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1289

950

"Interval",

1290

951

type_func =

1291

timedelta_to_milliseconds)

952

_timedelta_to_milliseconds)

1292

953

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

1293

954

1294

955

del notifychangeproperty

1336

997

return r

1337

998

1338

999

def _reset_approved(self):

1339

self.approved = None

1000

self._approved = None

1340

1001

return False

1341

1002

1342

1003

def approve(self, value=True):

1343

self.approved = value

1344

gobject.timeout_add(timedelta_to_milliseconds

1004

self.send_changedstate()

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1345

1007

(self.approval_duration),

1346

1008

self._reset_approved)

1347

self.send_changedstate()

1009

1348

1010

1349

1011

## D-Bus methods, signals & properties

1350

1012

_interface = "se.recompile.Mandos.Client"

1351

1013

1352

## Interfaces

1353

1354

@dbus_interface_annotations(_interface)

1355

def _foo(self):

1356

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

1357

"false"}

1358

1359

1014

## Signals

1360

1015

1361

1016

# CheckerCompleted - signal

1460

1115

access="readwrite")

1461

1116

def ApprovalDuration_dbus_property(self, value=None):

1462

1117

if value is None: # get

1463

return dbus.UInt64(timedelta_to_milliseconds(

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1464

1119

self.approval_duration))

1465

1120

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

1466

1121

1480

1135

def Host_dbus_property(self, value=None):

1481

1136

if value is None: # get

1482

1137

return dbus.String(self.host)

1483

self.host = unicode(value)

1138

self.host = value

1484

1139

1485

1140

# Created - property

1486

1141

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

1487

1142

def Created_dbus_property(self):

1488

return datetime_to_dbus(self.created)

1143

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

1489

1144

1490

1145

# LastEnabled - property

1491

1146

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

1512

1167

return

1513

1168

return datetime_to_dbus(self.last_checked_ok)

1514

1169

1515

# LastCheckerStatus - property

1516

@dbus_service_property(_interface, signature="n",

1517

access="read")

1518

def LastCheckerStatus_dbus_property(self):

1519

return dbus.Int16(self.last_checker_status)

1520

1521

1170

# Expires - property

1522

1171

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

1523

1172

def Expires_dbus_property(self):

1534

1183

def Timeout_dbus_property(self, value=None):

1535

1184

if value is None: # get

1536

1185

return dbus.UInt64(self.timeout_milliseconds())

1537

old_timeout = self.timeout

1538

1186

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

1539

# Reschedule disabling

1540

if self.enabled:

1541

now = datetime.datetime.utcnow()

1542

self.expires += self.timeout - old_timeout

1543

if self.expires <= now:

1544

# The timeout has passed

1545

self.disable()

1546

else:

1547

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

1548

is None):

1549

return

1550

gobject.source_remove(self.disable_initiator_tag)

1551

self.disable_initiator_tag = (

1552

gobject.timeout_add(

1553

timedelta_to_milliseconds(self.expires - now),

1554

self.disable))

1187

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

1188

return

1189

# Reschedule timeout

1190

gobject.source_remove(self.disable_initiator_tag)

1191

self.disable_initiator_tag = None

1192

self.expires = None

1193

time_to_die = _timedelta_to_milliseconds((self

1194

.last_checked_ok

1195

+ self.timeout)

1196

- datetime.datetime

1197

.utcnow())

1198

if time_to_die <= 0:

1199

# The timeout has passed

1200

self.disable()

1201

else:

1202

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

1203

+ datetime.timedelta(milliseconds =

1204

time_to_die))

1205

self.disable_initiator_tag = (gobject.timeout_add

1206

(time_to_die, self.disable))

1555

1207

1556

1208

# ExtendedTimeout - property

1557

1209

@dbus_service_property(_interface, signature="t",

1570

1222

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

1571

1223

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

1572

1224

return

1573

if self.enabled:

1574

# Reschedule checker run

1575

gobject.source_remove(self.checker_initiator_tag)

1576

self.checker_initiator_tag = (gobject.timeout_add

1577

(value, self.start_checker))

1578

self.start_checker() # Start one now, too

1225

# Reschedule checker run

1226

gobject.source_remove(self.checker_initiator_tag)

1227

self.checker_initiator_tag = (gobject.timeout_add

1228

(value, self.start_checker))

1229

self.start_checker() # Start one now, too

1579

1230

1580

1231

# Checker - property

1581

1232

@dbus_service_property(_interface, signature="s",

1583

1234

def Checker_dbus_property(self, value=None):

1584

1235

if value is None: # get

1585

1236

return dbus.String(self.checker_command)

1586

self.checker_command = unicode(value)

1237

self.checker_command = value

1587

1238

1588

1239

# CheckerRunning - property

1589

1240

@dbus_service_property(_interface, signature="b",

1618

1269

raise KeyError()

1619

1270

1620

1271

def __getattribute__(self, name):

1621

if name == '_pipe':

1272

if(name == '_pipe'):

1622

1273

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

1623

1274

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

1624

1275

data = self._pipe.recv()

1631

1282

return func

1632

1283

1633

1284

def __setattr__(self, name, value):

1634

if name == '_pipe':

1285

if(name == '_pipe'):

1635

1286

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

1636

1287

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

1637

1288

1289

class ClientDBusTransitional(ClientDBus):

1290

__metaclass__ = AlternateDBusNamesMetaclass

1638

1291

1639

1292

class ClientHandler(socketserver.BaseRequestHandler, object):

1640

1293

"""A class to handle client connections.

1723

1376

client.Rejected("Disabled")

1724

1377

return

1725

1378

1726

if client.approved or not client.approval_delay:

1379

if client._approved or not client.approval_delay:

1727

1380

#We are approved or approval is disabled

1728

1381

break

1729

elif client.approved is None:

1382

elif client._approved is None:

1730

1383

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

1731

1384

client.name)

1732

1385

if self.server.use_dbus:

1745

1398

#wait until timeout or approved

1746

1399

time = datetime.datetime.now()

1747

1400

client.changedstate.acquire()

1748

client.changedstate.wait(

1749

float(timedelta_to_milliseconds(delay)

1750

/ 1000))

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1751

1404

client.changedstate.release()

1752

1405

time2 = datetime.datetime.now()

1753

1406

if (time2 - time) >= delay:

1769

1422

try:

1770

1423

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

1771

1424

except gnutls.errors.GNUTLSError as error:

1772

logger.warning("gnutls send failed",

1773

exc_info=error)

1425

logger.warning("gnutls send failed")

1774

1426

return

1775

1427

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

1776

1428

sent, len(client.secret)

1779

1431

1780

1432

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

1781

1433

# bump the timeout using extended_timeout

1782

client.bump_timeout(client.extended_timeout)

1434

client.checked_ok(client.extended_timeout)

1783

1435

if self.server.use_dbus:

1784

1436

# Emit D-Bus signal

1785

1437

client.GotSecret()

1790

1442

try:

1791

1443

session.bye()

1792

1444

except gnutls.errors.GNUTLSError as error:

1793

logger.warning("GnuTLS bye failed",

1794

exc_info=error)

1445

logger.warning("GnuTLS bye failed")

1795

1446

1796

1447

@staticmethod

1797

1448

def peer_certificate(session):

1853

1504

# Convert the buffer to a Python bytestring

1854

1505

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

1855

1506

# Convert the bytestring to hexadecimal notation

1856

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

1507

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

1857

1508

return hex_fpr

1858

1509

1859

1510

1862

1513

def sub_process_main(self, request, address):

1863

1514

try:

1864

1515

self.finish_request(request, address)

1865

except Exception:

1516

except:

1866

1517

self.handle_error(request, address)

1867

1518

self.close_request(request)

1868

1519

1869

1520

def process_request(self, request, address):

1870

1521

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

1871

1522

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

1872

args = (request, address))

1523

args = (request,

1524

address))

1873

1525

proc.start()

1874

1526

return proc

1875

1527

1972

1624

self.enabled = False

1973

1625

self.clients = clients

1974

1626

if self.clients is None:

1975

self.clients = {}

1627

self.clients = set()

1976

1628

self.use_dbus = use_dbus

1977

1629

self.gnutls_priority = gnutls_priority

1978

1630

IPv6_TCPServer.__init__(self, server_address,

1997

1649

1998

1650

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

1999

1651

proc = None, client_object=None):

1652

condition_names = {

1653

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

1654

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

1655

# blocking).

1656

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

1657

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

1658

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

1659

# broken, usually for pipes and

1660

# sockets).

1661

}

1662

conditions_string = ' | '.join(name

1663

for cond, name in

1664

condition_names.iteritems()

1665

if cond & condition)

2000

1666

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

2001

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

1667

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

2002

1668

# Wait for other process to exit

2003

1669

proc.join()

2004

1670

return False

2011

1677

fpr = request[1]

2012

1678

address = request[2]

2013

1679

2014

for c in self.clients.itervalues():

1680

for c in self.clients:

2015

1681

if c.fingerprint == fpr:

2016

1682

client = c

2017

1683

break

2094

1760

elif suffix == "w":

2095

1761

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

2096

1762

else:

2097

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

2098

.format(suffix))

1763

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

2099

1764

except (ValueError, IndexError) as e:

2100

1765

raise ValueError(*(e.args))

2101

1766

timevalue += delta

2102

1767

return timevalue

2103

1768

2104

1769

1770

def if_nametoindex(interface):

1771

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

1772

1773

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

1774

global if_nametoindex

1775

try:

1776

if_nametoindex = (ctypes.cdll.LoadLibrary

1777

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

1778

.if_nametoindex)

1779

except (OSError, AttributeError):

1780

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

1781

def if_nametoindex(interface):

1782

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

1783

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

1784

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

1785

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1786

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

1787

interface))

1788

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

1789

ifreq[16:20])[0]

1790

return interface_index

1791

return if_nametoindex(interface)

1792

1793

2105

1794

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

2106

1795

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

2107

1796

2115

1804

sys.exit()

2116

1805

if not noclose:

2117

1806

# Close all standard open file descriptors

2118

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

1807

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

2119

1808

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

2120

1809

raise OSError(errno.ENODEV,

2121

"{0} not a character device"

2122

.format(os.devnull))

1810

"%s not a character device"

1811

% os.path.devnull)

2123

1812

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

2124

1813

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

2125

1814

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

2134

1823

2135

1824

parser = argparse.ArgumentParser()

2136

1825

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

2137

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

1826

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

2138

1827

help="show version number and exit")

2139

1828

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

2140

1829

help="Bind to interface IF")

2162

1851

" system bus interface")

2163

1852

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

2164

1853

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

2165

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

2166

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

2167

" state")

2168

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

2169

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

2170

2171

1854

options = parser.parse_args()

2172

1855

2173

1856

if options.check:

2186

1869

"use_dbus": "True",

2187

1870

"use_ipv6": "True",

2188

1871

"debuglevel": "",

2189

"restore": "True",

2190

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

2191

1872

}

2192

1873

2193

1874

# Parse config file for server-global settings

2210

1891

# options, if set.

2211

1892

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

2212

1893

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

2213

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

2214

"statedir"):

1894

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

2215

1895

value = getattr(options, option)

2216

1896

if value is not None:

2217

1897

server_settings[option] = value

2229

1909

debuglevel = server_settings["debuglevel"]

2230

1910

use_dbus = server_settings["use_dbus"]

2231

1911

use_ipv6 = server_settings["use_ipv6"]

2232

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

2233

stored_state_file)

2234

2235

if debug:

2236

initlogger(debug, logging.DEBUG)

2237

else:

2238

if not debuglevel:

2239

initlogger(debug)

2240

else:

2241

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

2242

initlogger(debug, level)

2243

1912

2244

1913

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

2245

1914

syslogger.setFormatter(logging.Formatter

2246

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

2247

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

2248

.format(server_settings

2249

["servicename"])))

1915

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

1916

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

1917

% server_settings["servicename"]))

2250

1918

2251

1919

# Parse config file with clients

2252

client_config = configparser.SafeConfigParser(Client

2253

.client_defaults)

1920

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

1921

"extended_timeout": "15m",

1922

"interval": "2m",

1923

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

1924

"host": "",

1925

"approval_delay": "0s",

1926

"approval_duration": "1s",

1927

}

1928

client_config = configparser.SafeConfigParser(client_defaults)

2254

1929

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

2255

1930

"clients.conf"))

2256

1931

2270

1945

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

2271

1946

try:

2272

1947

pidfile = open(pidfilename, "w")

2273

except IOError as e:

2274

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

2275

exc_info=e)

1948

except IOError:

1949

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

2276

1950

2277

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

1951

try:

1952

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

1953

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

1954

except KeyError:

2278

1955

try:

2279

uid = pwd.getpwnam(name).pw_uid

2280

gid = pwd.getpwnam(name).pw_gid

2281

break

1956

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

1957

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

2282

1958

except KeyError:

2283

continue

2284

else:

2285

uid = 65534

2286

gid = 65534

1959

try:

1960

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

1961

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

1962

except KeyError:

1963

uid = 65534

1964

gid = 65534

2287

1965

try:

2288

1966

os.setgid(gid)

2289

1967

os.setuid(uid)

2291

1969

if error[0] != errno.EPERM:

2292

1970

raise error

2293

1971

1972

if not debug and not debuglevel:

1973

syslogger.setLevel(logging.WARNING)

1974

console.setLevel(logging.WARNING)

1975

if debuglevel:

1976

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

1977

syslogger.setLevel(level)

1978

console.setLevel(level)

1979

2294

1980

if debug:

2295

1981

# Enable all possible GnuTLS debugging

2296

1982

2306

1992

.gnutls_global_set_log_function(debug_gnutls))

2307

1993

2308

1994

# Redirect stdin so all checkers get /dev/null

2309

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

1995

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

2310

1996

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

2311

1997

if null > 2:

2312

1998

os.close(null)

1999

else:

2000

# No console logging

2001

logger.removeHandler(console)

2313

2002

2314

2003

# Need to fork before connecting to D-Bus

2315

2004

if not debug:

2316

2005

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

2317

2006

daemon()

2318

2007

2319

gobject.threads_init()

2320

2321

2008

global main_loop

2322

2009

# From the Avahi example code

2323

DBusGMainLoop(set_as_default=True)

2010

DBusGMainLoop(set_as_default=True )

2324

2011

main_loop = gobject.MainLoop()

2325

2012

bus = dbus.SystemBus()

2326

2013

# End of Avahi example code

2332

2019

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

2333

2020

do_not_queue=True))

2334

2021

except dbus.exceptions.NameExistsException as e:

2335

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

2022

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

2336

2023

use_dbus = False

2337

2024

server_settings["use_dbus"] = False

2338

2025

tcp_server.use_dbus = False

2339

2026

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2340

service = AvahiServiceToSyslog(name =

2341

server_settings["servicename"],

2342

servicetype = "_mandos._tcp",

2343

protocol = protocol, bus = bus)

2027

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

2028

servicetype = "_mandos._tcp",

2029

protocol = protocol, bus = bus)

2344

2030

if server_settings["interface"]:

2345

2031

service.interface = (if_nametoindex

2346

2032

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

2350

2036

2351

2037

client_class = Client

2352

2038

if use_dbus:

2353

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

2354

2355

client_settings = Client.config_parser(client_config)

2356

old_client_settings = {}

2357

clients_data = {}

2358

2359

# Get client data and settings from last running state.

2360

if server_settings["restore"]:

2361

try:

2362

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

2363

clients_data, old_client_settings = (pickle.load

2364

(stored_state))

2365

os.remove(stored_state_path)

2366

except IOError as e:

2367

if e.errno == errno.ENOENT:

2368

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

2369

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

2370

else:

2371

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

2372

exc_info=e)

2373

raise

2374

except EOFError as e:

2375

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

2376

"EOFError:", exc_info=e)

2377

2378

with PGPEngine() as pgp:

2379

for client_name, client in clients_data.iteritems():

2380

# Decide which value to use after restoring saved state.

2381

# We have three different values: Old config file,

2382

# new config file, and saved state.

2383

# New config value takes precedence if it differs from old

2384

# config value, otherwise use saved state.

2385

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

2386

try:

2387

# For each value in new config, check if it

2388

# differs from the old config value (Except for

2389

# the "secret" attribute)

2390

if (name != "secret" and

2391

value != old_client_settings[client_name]

2392

[name]):

2393

client[name] = value

2394

except KeyError:

2395

pass

2396

2397

# Clients who has passed its expire date can still be

2398

# enabled if its last checker was successful. Clients

2399

# whose checker succeeded before we stored its state is

2400

# assumed to have successfully run all checkers during

2401

# downtime.

2402

if client["enabled"]:

2403

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

2404

if not client["last_checked_ok"]:

2405

logger.warning(

2406

"disabling client {0} - Client never "

2407

"performed a successful checker"

2408

.format(client_name))

2409

client["enabled"] = False

2410

elif client["last_checker_status"] != 0:

2411

logger.warning(

2412

"disabling client {0} - Client "

2413

"last checker failed with error code {1}"

2414

.format(client_name,

2415

client["last_checker_status"]))

2416

client["enabled"] = False

2417

else:

2418

client["expires"] = (datetime.datetime

2419

.utcnow()

2420

+ client["timeout"])

2421

logger.debug("Last checker succeeded,"

2422

" keeping {0} enabled"

2423

.format(client_name))

2039

client_class = functools.partial(ClientDBusTransitional,

2040

bus = bus)

2041

def client_config_items(config, section):

2042

special_settings = {

2043

"approved_by_default":

2044

lambda: config.getboolean(section,

2045

"approved_by_default"),

2046

}

2047

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

2424

2048

try:

2425

client["secret"] = (

2426

pgp.decrypt(client["encrypted_secret"],

2427

client_settings[client_name]

2428

["secret"]))

2429

except PGPError:

2430

# If decryption fails, we use secret from new settings

2431

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

2432

.format(client_name))

2433

client["secret"] = (

2434

client_settings[client_name]["secret"])

2435

2436

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

2437

for client_name in (set(old_client_settings)

2438

- set(client_settings)):

2439

del clients_data[client_name]

2440

for client_name in (set(client_settings)

2441

- set(old_client_settings)):

2442

clients_data[client_name] = client_settings[client_name]

2443

2444

# Create all client objects

2445

for client_name, client in clients_data.iteritems():

2446

tcp_server.clients[client_name] = client_class(

2447

name = client_name, settings = client)

2448

2049

yield (name, special_settings[name]())

2050

except KeyError:

2051

yield (name, value)

2052

2053

tcp_server.clients.update(set(

2054

client_class(name = section,

2055

config= dict(client_config_items(

2056

client_config, section)))

2057

for section in client_config.sections()))

2449

2058

if not tcp_server.clients:

2450

2059

logger.warning("No clients defined")

2451

2060

2452

2061

if not debug:

2453

2062

try:

2454

2063

with pidfile:

2462

2071

# "pidfile" was never created

2463

2072

pass

2464

2073

del pidfilename

2074

2465

2075

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

2466

2076

2467

2077

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

2468

2078

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

2469

2079

2470

2080

if use_dbus:

2471

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

2472

"se.bsnet.fukt.Mandos"})

2473

class MandosDBusService(DBusObjectWithProperties):

2081

class MandosDBusService(dbus.service.Object):

2474

2082

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

2475

2083

def __init__(self):

2476

2084

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

2477

2085

_interface = "se.recompile.Mandos"

2478

2086

2479

@dbus_interface_annotations(_interface)

2480

def _foo(self):

2481

return { "org.freedesktop.DBus.Property"

2482

".EmitsChangedSignal":

2483

"false"}

2484

2485

2087

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

2486

2088

def ClientAdded(self, objpath):

2487

2089

"D-Bus signal"

2501

2103

def GetAllClients(self):

2502

2104

"D-Bus method"

2503

2105

return dbus.Array(c.dbus_object_path

2504

for c in

2505

tcp_server.clients.itervalues())

2106

for c in tcp_server.clients)

2506

2107

2507

2108

@dbus.service.method(_interface,

2508

2109

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

2510

2111

"D-Bus method"

2511

2112

return dbus.Dictionary(

2512

2113

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

2513

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

2114

for c in tcp_server.clients),

2514

2115

signature="oa{sv}")

2515

2116

2516

2117

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

2517

2118

def RemoveClient(self, object_path):

2518

2119

"D-Bus method"

2519

for c in tcp_server.clients.itervalues():

2120

for c in tcp_server.clients:

2520

2121

if c.dbus_object_path == object_path:

2521

del tcp_server.clients[c.name]

2122

tcp_server.clients.remove(c)

2522

2123

c.remove_from_connection()

2523

2124

# Don't signal anything except ClientRemoved

2524

2125

c.disable(quiet=True)

2529

2130

2530

2131

del _interface

2531

2132

2532

mandos_dbus_service = MandosDBusService()

2133

class MandosDBusServiceTransitional(MandosDBusService):

2134

__metaclass__ = AlternateDBusNamesMetaclass

2135

mandos_dbus_service = MandosDBusServiceTransitional()

2533

2136

2534

2137

def cleanup():

2535

2138

"Cleanup function; run on exit"

2536

2139

service.cleanup()

2537

2140

2538

2141

multiprocessing.active_children()

2539

if not (tcp_server.clients or client_settings):

2540

return

2541

2542

# Store client before exiting. Secrets are encrypted with key

2543

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

2544

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

2545

clients = {}

2546

with PGPEngine() as pgp:

2547

for client in tcp_server.clients.itervalues():

2548

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

2549

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

2550

key)

2551

client_dict = {}

2552

2553

# A list of attributes that can not be pickled

2554

# + secret.

2555

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

2556

"checker"))

2557

for name, typ in (inspect.getmembers

2558

(dbus.service.Object)):

2559

exclude.add(name)

2560

2561

client_dict["encrypted_secret"] = (client

2562

.encrypted_secret)

2563

for attr in client.client_structure:

2564

if attr not in exclude:

2565

client_dict[attr] = getattr(client, attr)

2566

2567

clients[client.name] = client_dict

2568

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

2569

2570

try:

2571

with (tempfile.NamedTemporaryFile

2572

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

2573

dir=os.path.dirname(stored_state_path),

2574

delete=False)) as stored_state:

2575

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

2576

tempname=stored_state.name

2577

os.rename(tempname, stored_state_path)

2578

except (IOError, OSError) as e:

2579

if not debug:

2580

try:

2581

os.remove(tempname)

2582

except NameError:

2583

pass

2584

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

2585

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

2586

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

2587

else:

2588

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

2589

exc_info=e)

2590

raise e

2591

2592

# Delete all clients, and settings from config

2593

2142

while tcp_server.clients:

2594

name, client = tcp_server.clients.popitem()

2143

client = tcp_server.clients.pop()

2595

2144

if use_dbus:

2596

2145

client.remove_from_connection()

2146

client.disable_hook = None

2597

2147

# Don't signal anything except ClientRemoved

2598

2148

client.disable(quiet=True)

2599

2149

if use_dbus:

2601

2151

mandos_dbus_service.ClientRemoved(client

2602

2152

.dbus_object_path,

2603

2153

client.name)

2604

client_settings.clear()

2605

2154

2606

2155

atexit.register(cleanup)

2607

2156

2608

for client in tcp_server.clients.itervalues():

2157

for client in tcp_server.clients:

2609

2158

if use_dbus:

2610

2159

# Emit D-Bus signal

2611

2160

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2612

# Need to initiate checking of clients

2613

if client.enabled:

2614

client.init_checker()

2161

client.enable()

2615

2162

2616

2163

tcp_server.enable()

2617

2164

tcp_server.server_activate()

2620

2167

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

2621

2168

if use_ipv6:

2622

2169

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

2623

" flowinfo %d, scope_id %d",

2624

*tcp_server.socket.getsockname())

2170

" flowinfo %d, scope_id %d"

2171

% tcp_server.socket.getsockname())

2625

2172

else: # IPv4

2626

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

2627

*tcp_server.socket.getsockname())

2173

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

2174

% tcp_server.socket.getsockname())

2628

2175

2629

2176

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

2630

2177

2633

2180

try:

2634

2181

service.activate()

2635

2182

except dbus.exceptions.DBusException as error:

2636

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

2183

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

2637

2184

cleanup()

2638

2185

sys.exit(1)

2639

2186

# End of Avahi example code

2646

2193

logger.debug("Starting main loop")

2647

2194

main_loop.run()

2648

2195

except AvahiError as error:

2649

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

2196

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

2650

2197

cleanup()

2651

2198

sys.exit(1)

2652

2199

except KeyboardInterrupt:

2657

2204

# Must run before the D-Bus bus name gets deregistered

2658

2205

cleanup()

2659

2206

2207

2660

2208

if __name__ == '__main__':

2661

2209

main()