/mandos/trunk : revision 505.3.10

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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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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(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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"""

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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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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.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

504

else:

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

517

client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

332

return _timedelta_to_milliseconds(self.approval_delay)

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

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

336

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

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attribute."""

523

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self.name = name

524

# adding all client settings

525

for setting, value in settings.iteritems():

526

setattr(self, setting, value)

527

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if self.enabled:

529

if not hasattr(self, "last_enabled"):

530

self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

532

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

533

+ self.timeout)

534

else:

535

self.last_enabled = None

536

self.expires = None

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if config is None:

340

config = {}

538

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

539

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# Uppercase and remove spaces from fingerprint for later

540

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# comparison purposes with return value from the fingerprint()

541

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# function

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

346

.replace(" ", ""))

542

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

543

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

544

datetime.datetime.utcnow())

545

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# 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"

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% 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

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self.last_checked_ok = None

364

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

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self.extended_timeout = string_to_delta(config

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["extended_timeout"])

367

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

368

self.disable_hook = disable_hook

547

369

self.checker = None

548

370

self.checker_initiator_tag = None

549

371

self.disable_initiator_tag = None

372

self.expires = None

550

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self.checker_callback_tag = None

374

self.checker_command = config["checker"]

551

375

self.current_checker_command = None

552

self.approved = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

553

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"])

554

385

self.changedstate = (multiprocessing_manager

555

386

.Condition(multiprocessing_manager

556

387

.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)

568

388

569

# Send notice to process children that client state has changed

570

389

def send_changedstate(self):

571

with self.changedstate:

572

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

573

393

574

394

def enable(self):

575

395

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

576

396

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

577

397

# Already enabled

578

398

return

579

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

580

self.enabled = True

581

self.last_enabled = datetime.datetime.utcnow()

582

self.init_checker()

583

399

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

400

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

610

401

# and every interval from then on.

611

if self.checker_initiator_tag is not None:

612

gobject.source_remove(self.checker_initiator_tag)

613

402

self.checker_initiator_tag = (gobject.timeout_add

614

403

(self.interval_milliseconds(),

615

404

self.start_checker))

616

405

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

617

if self.disable_initiator_tag is not None:

618

gobject.source_remove(self.disable_initiator_tag)

406

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

619

407

self.disable_initiator_tag = (gobject.timeout_add

620

408

(self.timeout_milliseconds(),

621

409

self.disable))

410

self.enabled = True

411

self.last_enabled = datetime.datetime.utcnow()

622

412

# Also start a new checker *right now*.

623

413

self.start_checker()

624

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

625

441

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

626

442

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

627

443

self.checker_callback_tag = None

628

444

self.checker = None

629

445

if os.WIFEXITED(condition):

630

self.last_checker_status = os.WEXITSTATUS(condition)

631

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

632

448

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

633

449

vars(self))

634

450

self.checked_ok()

636

452

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

637

453

vars(self))

638

454

else:

639

self.last_checker_status = -1

640

455

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

641

456

vars(self))

642

457

643

def checked_ok(self):

644

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

645

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."""

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

"""

651

464

if timeout is None:

652

465

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

653

467

if self.disable_initiator_tag is not None:

654

468

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

656

469

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

657

470

self.disable_initiator_tag = (gobject.timeout_add

658

(timedelta_to_milliseconds

471

(_timedelta_to_milliseconds

659

472

(timeout), self.disable))

660

473

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

661

474

668

481

If a checker already exists, leave it running and do

669

482

nothing."""

670

483

# 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

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

675

488

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

676

489

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

677

490

# should be.

691

504

self.current_checker_command)

692

505

# Start a new checker if needed

693

506

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

507

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

508

# In case checker_command has exactly one % operator

509

command = self.checker_command % self.host

510

except TypeError:

511

# Escape attributes for the shell

512

escaped_attrs = dict(

513

(attr,

514

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

515

errors=

516

'replace')))

517

for attr in

518

self.runtime_expansions)

519

520

try:

521

command = self.checker_command % escaped_attrs

522

except TypeError as error:

523

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

524

' %s', self.checker_command, error)

525

return True # Try again later

705

526

self.current_checker_command = command

706

527

try:

707

528

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

713

534

self.checker = subprocess.Popen(command,

714

535

close_fds=True,

715

536

shell=True, cwd="/")

537

self.checker_callback_tag = (gobject.child_watch_add

538

(self.checker.pid,

539

self.checker_callback,

540

data=command))

541

# The checker may have completed before the gobject

542

# watch was added. Check for this.

543

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

544

if pid:

545

gobject.source_remove(self.checker_callback_tag)

546

self.checker_callback(pid, status, command)

716

547

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)

548

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

549

error)

729

550

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

730

551

return True

731

552

738

559

return

739

560

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

740

561

try:

741

self.checker.terminate()

562

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

742

563

#time.sleep(0.5)

743

564

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

744

# self.checker.kill()

565

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

745

566

except OSError as error:

746

567

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

747

568

raise

764

585

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

765

586

if byte_arrays and signature != "ay":

766

587

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

767

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

588

" signature %r" % signature)

768

589

def decorator(func):

769

590

func._dbus_is_property = True

770

591

func._dbus_interface = dbus_interface

778

599

return decorator

779

600

780

601

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

602

class DBusPropertyException(dbus.exceptions.DBusException):

819

603

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

820

604

"""

843

627

"""

844

628

845

629

@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)

630

def _is_dbus_property(obj):

631

return getattr(obj, "_dbus_is_property", False)

854

632

855

def _get_all_dbus_things(self, thing):

633

def _get_all_dbus_properties(self):

856

634

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

857

635

"""

858

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

859

name),

860

athing.__get__(self))

636

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

861

637

for cls in self.__class__.__mro__

862

for name, athing in

863

inspect.getmembers(cls,

864

self._is_dbus_thing(thing)))

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

865

640

866

641

def _get_dbus_property(self, interface_name, property_name):

867

642

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

869

644

"""

870

645

for cls in self.__class__.__mro__:

871

646

for name, value in (inspect.getmembers

872

(cls,

873

self._is_dbus_thing("property"))):

647

(cls, self._is_dbus_property)):

874

648

if (value._dbus_name == property_name

875

649

and value._dbus_interface == interface_name):

876

650

return value.__get__(self)

905

679

# signatures other than "ay".

906

680

if prop._dbus_signature != "ay":

907

681

raise ValueError

908

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

909

for byte in value))

682

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

683

for byte in value))

910

684

prop(value)

911

685

912

686

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

917

691

918

692

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

919

693

"""

920

properties = {}

921

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

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

922

696

if (interface_name

923

697

and interface_name != prop._dbus_interface):

924

698

# Interface non-empty but did not match

928

702

continue

929

703

value = prop()

930

704

if not hasattr(value, "variant_level"):

931

properties[name] = value

705

all[name] = value

932

706

continue

933

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

934

value.variant_level+1)

935

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")

936

710

937

711

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

938

712

out_signature="s",

939

713

path_keyword='object_path',

940

714

connection_keyword='connection')

941

715

def Introspect(self, object_path, connection):

942

"""Overloading of standard D-Bus method.

943

944

Inserts property tags and interface annotation tags.

716

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

945

717

"""

946

718

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

947

719

connection)

954

726

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

955

727

return e

956

728

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

957

# Add property tags

958

729

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

959

730

for name, prop

960

in self._get_all_dbus_things("property")

731

in self._get_all_dbus_properties()

961

732

if prop._dbus_interface

962

733

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

963

734

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

735

# Add the names to the return values for the

996

736

# "org.freedesktop.DBus.Properties" methods

997

737

if (if_tag.getAttribute("name")

1012

752

except (AttributeError, xml.dom.DOMException,

1013

753

xml.parsers.expat.ExpatError) as error:

1014

754

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

1015

exc_info=error)

755

error)

1016

756

return xmlstring

1017

757

1018

758

1023

763

return dbus.String(dt.isoformat(),

1024

764

variant_level=variant_level)

1025

765

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_names({"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).

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.

1049

770

"""

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):

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):

1057

778

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

1058

779

# with the wrong interface name

1059

780

if (not hasattr(attribute, "_dbus_interface")

1060

781

or not attribute._dbus_interface

1061

.startswith(orig_interface_name)):

782

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

1062

783

continue

1063

784

# Create an alternate D-Bus interface name based on

1064

785

# the current name

1065

786

alt_interface = (attribute._dbus_interface

1066

.replace(orig_interface_name,

1067

alt_interface_name))

1068

interface_names.add(alt_interface)

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1069

789

# Is this a D-Bus signal?

1070

790

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

1071

791

# Extract the original non-method function by

1086

806

nonmethod_func.func_name,

1087

807

nonmethod_func.func_defaults,

1088

808

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

809

# 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

810

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

811

# signals gets sent when the function is called

1099

812

def fixscope(func1, func2):

1100

813

"""This function is a scope container to pass

1101

814

func1 and func2 to the "call_both" function

1108

821

return call_both

1109

822

# Create the "call_both" function and add it to

1110

823

# the class

1111

attr[attrname] = fixscope(attribute, new_function)

824

attr[attrname] = fixscope(attribute,

825

new_function)

1112

826

# Is this a D-Bus method?

1113

827

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

1114

828

# Create a new, but exactly alike, function

1125

839

attribute.func_name,

1126

840

attribute.func_defaults,

1127

841

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

842

# Is this a D-Bus property?

1135

843

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

1136

844

# Create a new, but exactly alike, function

1150

858

attribute.func_name,

1151

859

attribute.func_defaults,

1152

860

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"})

861

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

862

1198

863

class ClientDBus(Client, DBusObjectWithProperties):

1199

864

"""A Client class using D-Bus

1200

865

1209

874

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

1210

875

1211

876

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

877

self._approvals_pending = 0

1212

878

self.bus = bus

1213

879

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

1214

880

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

1220

886

("/clients/" + client_object_name))

1221

887

DBusObjectWithProperties.__init__(self, self.bus,

1222

888

self.dbus_object_path)

1223

889

1224

890

def notifychangeproperty(transform_func,

1225

891

dbus_name, type_func=lambda x: x,

1226

892

variant_level=1):

1227

893

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

1228

894

its changes to DBus.

1229

895

1230

896

transform_fun: Function that takes a value and a variant_level

1231

897

and transforms it to a D-Bus type.

1232

898

dbus_name: D-Bus name of the variable

1249

915

1250

916

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

1251

917

918

1252

919

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1253

920

approvals_pending = notifychangeproperty(dbus.Boolean,

1254

921

"ApprovalPending",

1261

928

checker is not None)

1262

929

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1263

930

"LastCheckedOK")

1264

last_checker_status = notifychangeproperty(dbus.Int16,

1265

"LastCheckerStatus")

1266

931

last_approval_request = notifychangeproperty(

1267

932

datetime_to_dbus, "LastApprovalRequest")

1268

933

approved_by_default = notifychangeproperty(dbus.Boolean,

1269

934

"ApprovedByDefault")

1270

approval_delay = notifychangeproperty(dbus.UInt64,

935

approval_delay = notifychangeproperty(dbus.UInt16,

1271

936

"ApprovalDelay",

1272

937

type_func =

1273

timedelta_to_milliseconds)

938

_timedelta_to_milliseconds)

1274

939

approval_duration = notifychangeproperty(

1275

dbus.UInt64, "ApprovalDuration",

1276

type_func = timedelta_to_milliseconds)

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1277

942

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

1278

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

943

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

1279

944

type_func =

1280

timedelta_to_milliseconds)

945

_timedelta_to_milliseconds)

1281

946

extended_timeout = notifychangeproperty(

1282

dbus.UInt64, "ExtendedTimeout",

1283

type_func = timedelta_to_milliseconds)

1284

interval = notifychangeproperty(dbus.UInt64,

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1285

950

"Interval",

1286

951

type_func =

1287

timedelta_to_milliseconds)

952

_timedelta_to_milliseconds)

1288

953

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

1289

954

1290

955

del notifychangeproperty

1332

997

return r

1333

998

1334

999

def _reset_approved(self):

1335

self.approved = None

1000

self._approved = None

1336

1001

return False

1337

1002

1338

1003

def approve(self, value=True):

1339

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

1004

self.send_changedstate()

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1341

1007

(self.approval_duration),

1342

1008

self._reset_approved)

1343

self.send_changedstate()

1009

1344

1010

1345

1011

## D-Bus methods, signals & properties

1346

1012

_interface = "se.recompile.Mandos.Client"

1347

1013

1348

## Interfaces

1349

1350

@dbus_interface_annotations(_interface)

1351

def _foo(self):

1352

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

1353

"false"}

1354

1355

1014

## Signals

1356

1015

1357

1016

# CheckerCompleted - signal

1456

1115

access="readwrite")

1457

1116

def ApprovalDuration_dbus_property(self, value=None):

1458

1117

if value is None: # get

1459

return dbus.UInt64(timedelta_to_milliseconds(

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1460

1119

self.approval_duration))

1461

1120

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

1462

1121

1476

1135

def Host_dbus_property(self, value=None):

1477

1136

if value is None: # get

1478

1137

return dbus.String(self.host)

1479

self.host = unicode(value)

1138

self.host = value

1480

1139

1481

1140

# Created - property

1482

1141

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

1483

1142

def Created_dbus_property(self):

1484

return datetime_to_dbus(self.created)

1143

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

1485

1144

1486

1145

# LastEnabled - property

1487

1146

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

1508

1167

return

1509

1168

return datetime_to_dbus(self.last_checked_ok)

1510

1169

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

1170

# Expires - property

1518

1171

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

1519

1172

def Expires_dbus_property(self):

1530

1183

def Timeout_dbus_property(self, value=None):

1531

1184

if value is None: # get

1532

1185

return dbus.UInt64(self.timeout_milliseconds())

1533

old_timeout = self.timeout

1534

1186

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))

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))

1551

1207

1552

1208

# ExtendedTimeout - property

1553

1209

@dbus_service_property(_interface, signature="t",

1566

1222

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

1567

1223

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

1568

1224

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

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

1575

1230

1576

1231

# Checker - property

1577

1232

@dbus_service_property(_interface, signature="s",

1579

1234

def Checker_dbus_property(self, value=None):

1580

1235

if value is None: # get

1581

1236

return dbus.String(self.checker_command)

1582

self.checker_command = unicode(value)

1237

self.checker_command = value

1583

1238

1584

1239

# CheckerRunning - property

1585

1240

@dbus_service_property(_interface, signature="b",

1614

1269

raise KeyError()

1615

1270

1616

1271

def __getattribute__(self, name):

1617

if name == '_pipe':

1272

if(name == '_pipe'):

1618

1273

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

1619

1274

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

1620

1275

data = self._pipe.recv()

1627

1282

return func

1628

1283

1629

1284

def __setattr__(self, name, value):

1630

if name == '_pipe':

1285

if(name == '_pipe'):

1631

1286

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

1632

1287

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

1633

1288

1289

class ClientDBusTransitional(ClientDBus):

1290

__metaclass__ = AlternateDBusNamesMetaclass

1634

1291

1635

1292

class ClientHandler(socketserver.BaseRequestHandler, object):

1636

1293

"""A class to handle client connections.

1719

1376

client.Rejected("Disabled")

1720

1377

return

1721

1378

1722

if client.approved or not client.approval_delay:

1379

if client._approved or not client.approval_delay:

1723

1380

#We are approved or approval is disabled

1724

1381

break

1725

elif client.approved is None:

1382

elif client._approved is None:

1726

1383

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

1727

1384

client.name)

1728

1385

if self.server.use_dbus:

1741

1398

#wait until timeout or approved

1742

1399

time = datetime.datetime.now()

1743

1400

client.changedstate.acquire()

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1747

1404

client.changedstate.release()

1748

1405

time2 = datetime.datetime.now()

1749

1406

if (time2 - time) >= delay:

1765

1422

try:

1766

1423

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

1767

1424

except gnutls.errors.GNUTLSError as error:

1768

logger.warning("gnutls send failed",

1769

exc_info=error)

1425

logger.warning("gnutls send failed")

1770

1426

return

1771

1427

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

1772

1428

sent, len(client.secret)

1775

1431

1776

1432

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

1777

1433

# bump the timeout using extended_timeout

1778

client.bump_timeout(client.extended_timeout)

1434

client.checked_ok(client.extended_timeout)

1779

1435

if self.server.use_dbus:

1780

1436

# Emit D-Bus signal

1781

1437

client.GotSecret()

1786

1442

try:

1787

1443

session.bye()

1788

1444

except gnutls.errors.GNUTLSError as error:

1789

logger.warning("GnuTLS bye failed",

1790

exc_info=error)

1445

logger.warning("GnuTLS bye failed")

1791

1446

1792

1447

@staticmethod

1793

1448

def peer_certificate(session):

1849

1504

# Convert the buffer to a Python bytestring

1850

1505

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

1851

1506

# Convert the bytestring to hexadecimal notation

1852

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

1507

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

1853

1508

return hex_fpr

1854

1509

1855

1510

1858

1513

def sub_process_main(self, request, address):

1859

1514

try:

1860

1515

self.finish_request(request, address)

1861

except Exception:

1516

except:

1862

1517

self.handle_error(request, address)

1863

1518

self.close_request(request)

1864

1519

1865

1520

def process_request(self, request, address):

1866

1521

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

1867

1522

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

1868

args = (request, address))

1523

args = (request,

1524

address))

1869

1525

proc.start()

1870

1526

return proc

1871

1527

1921

1577

str(self.interface

1922

1578

+ '\0'))

1923

1579

except socket.error as error:

1924

if error.errno == errno.EPERM:

1580

if error[0] == errno.EPERM:

1925

1581

logger.error("No permission to"

1926

1582

" bind to interface %s",

1927

1583

self.interface)

1928

elif error.errno == errno.ENOPROTOOPT:

1584

elif error[0] == errno.ENOPROTOOPT:

1929

1585

logger.error("SO_BINDTODEVICE not available;"

1930

1586

" cannot bind to interface %s",

1931

1587

self.interface)

1932

elif error.errno == errno.ENODEV:

1933

logger.error("Interface %s does not"

1934

" exist, cannot bind",

1935

self.interface)

1936

1588

else:

1937

1589

raise

1938

1590

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

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)

2290

1968

except OSError as error:

2291

if error.errno != errno.EPERM:

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

2075

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

2465

2076

2466

2077

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

2467

2078

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

2468

2079

2469

2080

if use_dbus:

2470

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

2471

"se.bsnet.fukt.Mandos"})

2472

class MandosDBusService(DBusObjectWithProperties):

2081

class MandosDBusService(dbus.service.Object):

2473

2082

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

2474

2083

def __init__(self):

2475

2084

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

2476

2085

_interface = "se.recompile.Mandos"

2477

2086

2478

@dbus_interface_annotations(_interface)

2479

def _foo(self):

2480

return { "org.freedesktop.DBus.Property"

2481

".EmitsChangedSignal":

2482

"false"}

2483

2484

2087

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

2485

2088

def ClientAdded(self, objpath):

2486

2089

"D-Bus signal"

2500

2103

def GetAllClients(self):

2501

2104

"D-Bus method"

2502

2105

return dbus.Array(c.dbus_object_path

2503

for c in

2504

tcp_server.clients.itervalues())

2106

for c in tcp_server.clients)

2505

2107

2506

2108

@dbus.service.method(_interface,

2507

2109

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

2509

2111

"D-Bus method"

2510

2112

return dbus.Dictionary(

2511

2113

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

2512

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

2114

for c in tcp_server.clients),

2513

2115

signature="oa{sv}")

2514

2116

2515

2117

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

2516

2118

def RemoveClient(self, object_path):

2517

2119

"D-Bus method"

2518

for c in tcp_server.clients.itervalues():

2120

for c in tcp_server.clients:

2519

2121

if c.dbus_object_path == object_path:

2520

del tcp_server.clients[c.name]

2122

tcp_server.clients.remove(c)

2521

2123

c.remove_from_connection()

2522

2124

# Don't signal anything except ClientRemoved

2523

2125

c.disable(quiet=True)

2528

2130

2529

2131

del _interface

2530

2132

2531

mandos_dbus_service = MandosDBusService()

2133

class MandosDBusServiceTransitional(MandosDBusService):

2134

__metaclass__ = AlternateDBusNamesMetaclass

2135

mandos_dbus_service = MandosDBusServiceTransitional()

2532

2136

2533

2137

def cleanup():

2534

2138

"Cleanup function; run on exit"

2535

2139

service.cleanup()

2536

2140

2537

2141

multiprocessing.active_children()

2538

if not (tcp_server.clients or client_settings):

2539

return

2540

2541

# Store client before exiting. Secrets are encrypted with key

2542

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

2543

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

2544

clients = {}

2545

with PGPEngine() as pgp:

2546

for client in tcp_server.clients.itervalues():

2547

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

2548

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

2549

key)

2550

client_dict = {}

2551

2552

# A list of attributes that can not be pickled

2553

# + secret.

2554

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

2555

"checker"))

2556

for name, typ in (inspect.getmembers

2557

(dbus.service.Object)):

2558

exclude.add(name)

2559

2560

client_dict["encrypted_secret"] = (client

2561

.encrypted_secret)

2562

for attr in client.client_structure:

2563

if attr not in exclude:

2564

client_dict[attr] = getattr(client, attr)

2565

2566

clients[client.name] = client_dict

2567

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

2568

2569

try:

2570

with (tempfile.NamedTemporaryFile

2571

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

2572

dir=os.path.dirname(stored_state_path),

2573

delete=False)) as stored_state:

2574

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

2575

tempname=stored_state.name

2576

os.rename(tempname, stored_state_path)

2577

except (IOError, OSError) as e:

2578

if not debug:

2579

try:

2580

os.remove(tempname)

2581

except NameError:

2582

pass

2583

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

2584

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

2585

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

2586

else:

2587

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

2588

exc_info=e)

2589

raise e

2590

2591

# Delete all clients, and settings from config

2592

2142

while tcp_server.clients:

2593

name, client = tcp_server.clients.popitem()

2143

client = tcp_server.clients.pop()

2594

2144

if use_dbus:

2595

2145

client.remove_from_connection()

2146

client.disable_hook = None

2596

2147

# Don't signal anything except ClientRemoved

2597

2148

client.disable(quiet=True)

2598

2149

if use_dbus:

2600

2151

mandos_dbus_service.ClientRemoved(client

2601

2152

.dbus_object_path,

2602

2153

client.name)

2603

client_settings.clear()

2604

2154

2605

2155

atexit.register(cleanup)

2606

2156

2607

for client in tcp_server.clients.itervalues():

2157

for client in tcp_server.clients:

2608

2158

if use_dbus:

2609

2159

# Emit D-Bus signal

2610

2160

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2611

# Need to initiate checking of clients

2612

if client.enabled:

2613

client.init_checker()

2161

client.enable()

2614

2162

2615

2163

tcp_server.enable()

2616

2164

tcp_server.server_activate()

2619

2167

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

2620

2168

if use_ipv6:

2621

2169

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

2622

" flowinfo %d, scope_id %d",

2623

*tcp_server.socket.getsockname())

2170

" flowinfo %d, scope_id %d"

2171

% tcp_server.socket.getsockname())

2624

2172

else: # IPv4

2625

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

2626

*tcp_server.socket.getsockname())

2173

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

2174

% tcp_server.socket.getsockname())

2627

2175

2628

2176

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

2629

2177

2632

2180

try:

2633

2181

service.activate()

2634

2182

except dbus.exceptions.DBusException as error:

2635

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

2183

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

2636

2184

cleanup()

2637

2185

sys.exit(1)

2638

2186

# End of Avahi example code

2645

2193

logger.debug("Starting main loop")

2646

2194

main_loop.run()

2647

2195

except AvahiError as error:

2648

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

2196

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

2649

2197

cleanup()

2650

2198

sys.exit(1)

2651

2199

except KeyboardInterrupt:

2656

2204

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

2657

2205

cleanup()

2658

2206

2207

2659

2208

if __name__ == '__main__':

2660

2209

main()