/mandos/release : revision 237.11.16

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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 = "1.5.4"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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version = "1.4.0"

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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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"""

483

settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

486

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")

492

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")

499

elif "secfile" in section:

500

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

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(section["secfile"])),

502

"rb") as secfile:

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

504

else:

505

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

506

.format(section))

507

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

510

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"])

515

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

521

522

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):

335

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

336

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

337

attribute."""

523

338

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:

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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)

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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

342

# 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:

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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

547

369

self.checker = None

548

370

self.checker_initiator_tag = None

549

371

self.disable_initiator_tag = None

372

self.expires = None

550

373

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

399

self.send_changedstate()

400

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

401

# and every interval from then on.

402

self.checker_initiator_tag = (gobject.timeout_add

403

(self.interval_milliseconds(),

404

self.start_checker))

405

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

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406

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

407

self.disable_initiator_tag = (gobject.timeout_add

408

(self.timeout_milliseconds(),

409

self.disable))

580

410

self.enabled = True

581

411

self.last_enabled = datetime.datetime.utcnow()

582

self.init_checker()

583

self.send_changedstate()

412

# Also start a new checker *right now*.

413

self.start_checker()

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414

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415

def disable(self, quiet=True):

586

416

"""Disable this client."""

587

417

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

588

418

return False

589

419

if not quiet:

420

self.send_changedstate()

421

if not quiet:

590

422

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

591

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

423

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

592

424

gobject.source_remove(self.disable_initiator_tag)

593

425

self.disable_initiator_tag = None

594

426

self.expires = None

595

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

427

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

596

428

gobject.source_remove(self.checker_initiator_tag)

597

429

self.checker_initiator_tag = None

598

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

599

433

self.enabled = False

600

if not quiet:

601

self.send_changedstate()

602

434

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

603

435

return False

604

436

605

437

def __del__(self):

438

self.disable_hook = None

606

439

self.disable()

607

440

608

def init_checker(self):

609

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

610

# and every interval from then on.

611

if self.checker_initiator_tag is not None:

612

gobject.source_remove(self.checker_initiator_tag)

613

self.checker_initiator_tag = (gobject.timeout_add

614

(self.interval_milliseconds(),

615

self.start_checker))

616

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

617

if self.disable_initiator_tag is not None:

618

gobject.source_remove(self.disable_initiator_tag)

619

self.disable_initiator_tag = (gobject.timeout_add

620

(self.timeout_milliseconds(),

621

self.disable))

622

# Also start a new checker *right now*.

623

self.start_checker()

624

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

653

if self.disable_initiator_tag is not None:

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

656

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

657

self.disable_initiator_tag = (gobject.timeout_add

658

(timedelta_to_milliseconds

659

(timeout), self.disable))

660

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

466

self.last_checked_ok = datetime.datetime.utcnow()

467

gobject.source_remove(self.disable_initiator_tag)

468

self.disable_initiator_tag = (gobject.timeout_add

469

(_timedelta_to_milliseconds

470

(timeout), self.disable))

471

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

661

472

662

473

def need_approval(self):

663

474

self.last_approval_request = datetime.datetime.utcnow()

668

479

If a checker already exists, leave it running and do

669

480

nothing."""

670

481

# 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

482

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

483

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

484

# client would inevitably timeout, since no checker would get

485

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

675

486

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

676

487

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

677

488

# should be.

691

502

self.current_checker_command)

692

503

# Start a new checker if needed

693

504

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

505

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

506

# In case checker_command has exactly one % operator

507

command = self.checker_command % self.host

508

except TypeError:

509

# Escape attributes for the shell

510

escaped_attrs = dict(

511

(attr,

512

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

513

errors=

514

'replace')))

515

for attr in

516

self.runtime_expansions)

517

518

try:

519

command = self.checker_command % escaped_attrs

520

except TypeError as error:

521

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

522

' %s', self.checker_command, error)

523

return True # Try again later

705

524

self.current_checker_command = command

706

525

try:

707

526

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

713

532

self.checker = subprocess.Popen(command,

714

533

close_fds=True,

715

534

shell=True, cwd="/")

535

self.checker_callback_tag = (gobject.child_watch_add

536

(self.checker.pid,

537

self.checker_callback,

538

data=command))

539

# The checker may have completed before the gobject

540

# watch was added. Check for this.

541

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

542

if pid:

543

gobject.source_remove(self.checker_callback_tag)

544

self.checker_callback(pid, status, command)

716

545

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)

546

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

547

error)

729

548

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

730

549

return True

731

550

738

557

return

739

558

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

740

559

try:

741

self.checker.terminate()

560

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

742

561

#time.sleep(0.5)

743

562

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

744

# self.checker.kill()

563

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

745

564

except OSError as error:

746

565

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

747

566

raise

764

583

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

765

584

if byte_arrays and signature != "ay":

766

585

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

767

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

586

" signature %r" % signature)

768

587

def decorator(func):

769

588

func._dbus_is_property = True

770

589

func._dbus_interface = dbus_interface

778

597

return decorator

779

598

780

599

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

600

class DBusPropertyException(dbus.exceptions.DBusException):

819

601

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

820

602

"""

843

625

"""

844

626

845

627

@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)

628

def _is_dbus_property(obj):

629

return getattr(obj, "_dbus_is_property", False)

854

630

855

def _get_all_dbus_things(self, thing):

631

def _get_all_dbus_properties(self):

856

632

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

857

633

"""

858

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

859

name),

860

athing.__get__(self))

634

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

861

635

for cls in self.__class__.__mro__

862

for name, athing in

863

inspect.getmembers(cls,

864

self._is_dbus_thing(thing)))

636

for name, prop in

637

inspect.getmembers(cls, self._is_dbus_property))

865

638

866

639

def _get_dbus_property(self, interface_name, property_name):

867

640

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

869

642

"""

870

643

for cls in self.__class__.__mro__:

871

644

for name, value in (inspect.getmembers

872

(cls,

873

self._is_dbus_thing("property"))):

645

(cls, self._is_dbus_property)):

874

646

if (value._dbus_name == property_name

875

647

and value._dbus_interface == interface_name):

876

648

return value.__get__(self)

905

677

# signatures other than "ay".

906

678

if prop._dbus_signature != "ay":

907

679

raise ValueError

908

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

909

for byte in value))

680

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

681

for byte in value))

910

682

prop(value)

911

683

912

684

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

917

689

918

690

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

919

691

"""

920

properties = {}

921

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

692

all = {}

693

for name, prop in self._get_all_dbus_properties():

922

694

if (interface_name

923

695

and interface_name != prop._dbus_interface):

924

696

# Interface non-empty but did not match

928

700

continue

929

701

value = prop()

930

702

if not hasattr(value, "variant_level"):

931

properties[name] = value

703

all[name] = value

932

704

continue

933

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

934

value.variant_level+1)

935

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

705

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

706

value.variant_level+1)

707

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

936

708

937

709

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

938

710

out_signature="s",

939

711

path_keyword='object_path',

940

712

connection_keyword='connection')

941

713

def Introspect(self, object_path, connection):

942

"""Overloading of standard D-Bus method.

943

944

Inserts property tags and interface annotation tags.

714

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

945

715

"""

946

716

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

947

717

connection)

954

724

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

955

725

return e

956

726

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

957

# Add property tags

958

727

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

959

728

for name, prop

960

in self._get_all_dbus_things("property")

729

in self._get_all_dbus_properties()

961

730

if prop._dbus_interface

962

731

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

963

732

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

733

# Add the names to the return values for the

996

734

# "org.freedesktop.DBus.Properties" methods

997

735

if (if_tag.getAttribute("name")

1012

750

except (AttributeError, xml.dom.DOMException,

1013

751

xml.parsers.expat.ExpatError) as error:

1014

752

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

1015

exc_info=error)

753

error)

1016

754

return xmlstring

1017

755

1018

756

1019

def datetime_to_dbus(dt, variant_level=0):

757

def datetime_to_dbus (dt, variant_level=0):

1020

758

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

1021

759

if dt is None:

1022

760

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

1023

761

return dbus.String(dt.isoformat(),

1024

762

variant_level=variant_level)

1025

763

1026

1027

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1028

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

1029

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

1030

interface names according to the "alt_interface_names" mapping.

1031

Usage:

1032

1033

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

1034

"net.example.AlternateInterface"})

1035

class SampleDBusObject(dbus.service.Object):

1036

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

1037

def SampleDBusMethod():

1038

pass

1039

1040

The above "SampleDBusMethod" on "SampleDBusObject" will be

1041

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

1042

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

1043

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

1044

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

1045

1046

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

1047

(from DBusObjectWithProperties) and interfaces (from the

1048

dbus_interface_annotations decorator).

764

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

765

.__metaclass__):

766

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

767

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

1049

768

"""

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):

769

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

770

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

771

# methods, signals, or properties in them

772

for base in (b for b in bases

773

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

774

# Go though all attributes of the base class

775

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

1057

776

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

1058

777

# with the wrong interface name

1059

778

if (not hasattr(attribute, "_dbus_interface")

1060

779

or not attribute._dbus_interface

1061

.startswith(orig_interface_name)):

780

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

1062

781

continue

1063

782

# Create an alternate D-Bus interface name based on

1064

783

# the current name

1065

784

alt_interface = (attribute._dbus_interface

1066

.replace(orig_interface_name,

1067

alt_interface_name))

1068

interface_names.add(alt_interface)

785

.replace("se.recompile.Mandos",

786

"se.bsnet.fukt.Mandos"))

1069

787

# Is this a D-Bus signal?

1070

788

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

1071

789

# Extract the original non-method function by

1086

804

nonmethod_func.func_name,

1087

805

nonmethod_func.func_defaults,

1088

806

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

807

# 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

808

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

809

# signals gets sent when the function is called

1099

810

def fixscope(func1, func2):

1100

811

"""This function is a scope container to pass

1101

812

func1 and func2 to the "call_both" function

1108

819

return call_both

1109

820

# Create the "call_both" function and add it to

1110

821

# the class

1111

attr[attrname] = fixscope(attribute, new_function)

822

attr[attrname] = fixscope(attribute,

823

new_function)

1112

824

# Is this a D-Bus method?

1113

825

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

1114

826

# Create a new, but exactly alike, function

1125

837

attribute.func_name,

1126

838

attribute.func_defaults,

1127

839

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

840

# Is this a D-Bus property?

1135

841

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

1136

842

# Create a new, but exactly alike, function

1150

856

attribute.func_name,

1151

857

attribute.func_defaults,

1152

858

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"})

859

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

860

1198

861

class ClientDBus(Client, DBusObjectWithProperties):

1199

862

"""A Client class using D-Bus

1200

863

1209

872

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

1210

873

1211

874

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

875

self._approvals_pending = 0

1212

876

self.bus = bus

1213

877

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

1214

878

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

1220

884

("/clients/" + client_object_name))

1221

885

DBusObjectWithProperties.__init__(self, self.bus,

1222

886

self.dbus_object_path)

1223

887

1224

888

def notifychangeproperty(transform_func,

1225

889

dbus_name, type_func=lambda x: x,

1226

890

variant_level=1):

1227

891

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

1228

892

its changes to DBus.

1229

893

1230

894

transform_fun: Function that takes a value and a variant_level

1231

895

and transforms it to a D-Bus type.

1232

896

dbus_name: D-Bus name of the variable

1249

913

1250

914

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

1251

915

916

1252

917

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1253

918

approvals_pending = notifychangeproperty(dbus.Boolean,

1254

919

"ApprovalPending",

1261

926

checker is not None)

1262

927

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1263

928

"LastCheckedOK")

1264

last_checker_status = notifychangeproperty(dbus.Int16,

1265

"LastCheckerStatus")

1266

929

last_approval_request = notifychangeproperty(

1267

930

datetime_to_dbus, "LastApprovalRequest")

1268

931

approved_by_default = notifychangeproperty(dbus.Boolean,

1269

932

"ApprovedByDefault")

1270

approval_delay = notifychangeproperty(dbus.UInt64,

933

approval_delay = notifychangeproperty(dbus.UInt16,

1271

934

"ApprovalDelay",

1272

935

type_func =

1273

timedelta_to_milliseconds)

936

_timedelta_to_milliseconds)

1274

937

approval_duration = notifychangeproperty(

1275

dbus.UInt64, "ApprovalDuration",

1276

type_func = timedelta_to_milliseconds)

938

dbus.UInt16, "ApprovalDuration",

939

type_func = _timedelta_to_milliseconds)

1277

940

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

1278

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

941

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

1279

942

type_func =

1280

timedelta_to_milliseconds)

943

_timedelta_to_milliseconds)

1281

944

extended_timeout = notifychangeproperty(

1282

dbus.UInt64, "ExtendedTimeout",

1283

type_func = timedelta_to_milliseconds)

1284

interval = notifychangeproperty(dbus.UInt64,

945

dbus.UInt16, "ExtendedTimeout",

946

type_func = _timedelta_to_milliseconds)

947

interval = notifychangeproperty(dbus.UInt16,

1285

948

"Interval",

1286

949

type_func =

1287

timedelta_to_milliseconds)

950

_timedelta_to_milliseconds)

1288

951

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

1289

952

1290

953

del notifychangeproperty

1332

995

return r

1333

996

1334

997

def _reset_approved(self):

1335

self.approved = None

998

self._approved = None

1336

999

return False

1337

1000

1338

1001

def approve(self, value=True):

1339

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

1002

self.send_changedstate()

1003

self._approved = value

1004

gobject.timeout_add(_timedelta_to_milliseconds

1341

1005

(self.approval_duration),

1342

1006

self._reset_approved)

1343

self.send_changedstate()

1007

1344

1008

1345

1009

## D-Bus methods, signals & properties

1346

1010

_interface = "se.recompile.Mandos.Client"

1347

1011

1348

## Interfaces

1349

1350

@dbus_interface_annotations(_interface)

1351

def _foo(self):

1352

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

1353

"false"}

1354

1355

1012

## Signals

1356

1013

1357

1014

# CheckerCompleted - signal

1456

1113

access="readwrite")

1457

1114

def ApprovalDuration_dbus_property(self, value=None):

1458

1115

if value is None: # get

1459

return dbus.UInt64(timedelta_to_milliseconds(

1116

return dbus.UInt64(_timedelta_to_milliseconds(

1460

1117

self.approval_duration))

1461

1118

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

1462

1119

1476

1133

def Host_dbus_property(self, value=None):

1477

1134

if value is None: # get

1478

1135

return dbus.String(self.host)

1479

self.host = unicode(value)

1136

self.host = value

1480

1137

1481

1138

# Created - property

1482

1139

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

1483

1140

def Created_dbus_property(self):

1484

return datetime_to_dbus(self.created)

1141

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

1485

1142

1486

1143

# LastEnabled - property

1487

1144

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

1508

1165

return

1509

1166

return datetime_to_dbus(self.last_checked_ok)

1510

1167

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

1168

# Expires - property

1518

1169

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

1519

1170

def Expires_dbus_property(self):

1530

1181

def Timeout_dbus_property(self, value=None):

1531

1182

if value is None: # get

1532

1183

return dbus.UInt64(self.timeout_milliseconds())

1533

old_timeout = self.timeout

1534

1184

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))

1185

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

1186

return

1187

# Reschedule timeout

1188

gobject.source_remove(self.disable_initiator_tag)

1189

self.disable_initiator_tag = None

1190

self.expires = None

1191

time_to_die = _timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow())

1196

if time_to_die <= 0:

1197

# The timeout has passed

1198

self.disable()

1199

else:

1200

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

1201

+ datetime.timedelta(milliseconds =

1202

time_to_die))

1203

self.disable_initiator_tag = (gobject.timeout_add

1204

(time_to_die, self.disable))

1551

1205

1552

1206

# ExtendedTimeout - property

1553

1207

@dbus_service_property(_interface, signature="t",

1566

1220

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

1567

1221

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

1568

1222

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

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

1575

1228

1576

1229

# Checker - property

1577

1230

@dbus_service_property(_interface, signature="s",

1579

1232

def Checker_dbus_property(self, value=None):

1580

1233

if value is None: # get

1581

1234

return dbus.String(self.checker_command)

1582

self.checker_command = unicode(value)

1235

self.checker_command = value

1583

1236

1584

1237

# CheckerRunning - property

1585

1238

@dbus_service_property(_interface, signature="b",

1614

1267

raise KeyError()

1615

1268

1616

1269

def __getattribute__(self, name):

1617

if name == '_pipe':

1270

if(name == '_pipe'):

1618

1271

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

1619

1272

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

1620

1273

data = self._pipe.recv()

1627

1280

return func

1628

1281

1629

1282

def __setattr__(self, name, value):

1630

if name == '_pipe':

1283

if(name == '_pipe'):

1631

1284

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

1632

1285

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

1633

1286

1287

class ClientDBusTransitional(ClientDBus):

1288

__metaclass__ = AlternateDBusNamesMetaclass

1634

1289

1635

1290

class ClientHandler(socketserver.BaseRequestHandler, object):

1636

1291

"""A class to handle client connections.

1719

1374

client.Rejected("Disabled")

1720

1375

return

1721

1376

1722

if client.approved or not client.approval_delay:

1377

if client._approved or not client.approval_delay:

1723

1378

#We are approved or approval is disabled

1724

1379

break

1725

elif client.approved is None:

1380

elif client._approved is None:

1726

1381

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

1727

1382

client.name)

1728

1383

if self.server.use_dbus:

1741

1396

#wait until timeout or approved

1742

1397

time = datetime.datetime.now()

1743

1398

client.changedstate.acquire()

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1399

(client.changedstate.wait

1400

(float(client._timedelta_to_milliseconds(delay)

1401

/ 1000)))

1747

1402

client.changedstate.release()

1748

1403

time2 = datetime.datetime.now()

1749

1404

if (time2 - time) >= delay:

1765

1420

try:

1766

1421

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

1767

1422

except gnutls.errors.GNUTLSError as error:

1768

logger.warning("gnutls send failed",

1769

exc_info=error)

1423

logger.warning("gnutls send failed")

1770

1424

return

1771

1425

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

1772

1426

sent, len(client.secret)

1775

1429

1776

1430

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

1777

1431

# bump the timeout using extended_timeout

1778

client.bump_timeout(client.extended_timeout)

1432

client.checked_ok(client.extended_timeout)

1779

1433

if self.server.use_dbus:

1780

1434

# Emit D-Bus signal

1781

1435

client.GotSecret()

1786

1440

try:

1787

1441

session.bye()

1788

1442

except gnutls.errors.GNUTLSError as error:

1789

logger.warning("GnuTLS bye failed",

1790

exc_info=error)

1443

logger.warning("GnuTLS bye failed")

1791

1444

1792

1445

@staticmethod

1793

1446

def peer_certificate(session):

1849

1502

# Convert the buffer to a Python bytestring

1850

1503

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

1851

1504

# Convert the bytestring to hexadecimal notation

1852

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

1505

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

1853

1506

return hex_fpr

1854

1507

1855

1508

1858

1511

def sub_process_main(self, request, address):

1859

1512

try:

1860

1513

self.finish_request(request, address)

1861

except Exception:

1514

except:

1862

1515

self.handle_error(request, address)

1863

1516

self.close_request(request)

1864

1517

1865

1518

def process_request(self, request, address):

1866

1519

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

1867

1520

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

1868

args = (request, address))

1521

args = (request,

1522

address))

1869

1523

proc.start()

1870

1524

return proc

1871

1525

1921

1575

str(self.interface

1922

1576

+ '\0'))

1923

1577

except socket.error as error:

1924

if error.errno == errno.EPERM:

1578

if error[0] == errno.EPERM:

1925

1579

logger.error("No permission to"

1926

1580

" bind to interface %s",

1927

1581

self.interface)

1928

elif error.errno == errno.ENOPROTOOPT:

1582

elif error[0] == errno.ENOPROTOOPT:

1929

1583

logger.error("SO_BINDTODEVICE not available;"

1930

1584

" cannot bind to interface %s",

1931

1585

self.interface)

1932

elif error.errno == errno.ENODEV:

1933

logger.error("Interface %s does not"

1934

" exist, cannot bind",

1935

self.interface)

1936

1586

else:

1937

1587

raise

1938

1588

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

1972

1622

self.enabled = False

1973

1623

self.clients = clients

1974

1624

if self.clients is None:

1975

self.clients = {}

1625

self.clients = set()

1976

1626

self.use_dbus = use_dbus

1977

1627

self.gnutls_priority = gnutls_priority

1978

1628

IPv6_TCPServer.__init__(self, server_address,

1997

1647

1998

1648

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

1999

1649

proc = None, client_object=None):

1650

condition_names = {

1651

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

1652

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

1653

# blocking).

1654

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

1655

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

1656

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

1657

# broken, usually for pipes and

1658

# sockets).

1659

}

1660

conditions_string = ' | '.join(name

1661

for cond, name in

1662

condition_names.iteritems()

1663

if cond & condition)

2000

1664

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

2001

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

1665

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

2002

1666

# Wait for other process to exit

2003

1667

proc.join()

2004

1668

return False

2011

1675

fpr = request[1]

2012

1676

address = request[2]

2013

1677

2014

for c in self.clients.itervalues():

1678

for c in self.clients:

2015

1679

if c.fingerprint == fpr:

2016

1680

client = c

2017

1681

break

2094

1758

elif suffix == "w":

2095

1759

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

2096

1760

else:

2097

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

2098

.format(suffix))

1761

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

2099

1762

except (ValueError, IndexError) as e:

2100

1763

raise ValueError(*(e.args))

2101

1764

timevalue += delta

2102

1765

return timevalue

2103

1766

2104

1767

1768

def if_nametoindex(interface):

1769

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

1770

1771

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

1772

global if_nametoindex

1773

try:

1774

if_nametoindex = (ctypes.cdll.LoadLibrary

1775

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

1776

.if_nametoindex)

1777

except (OSError, AttributeError):

1778

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

1779

def if_nametoindex(interface):

1780

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

1781

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

1782

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

1783

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1784

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

1785

interface))

1786

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

1787

ifreq[16:20])[0]

1788

return interface_index

1789

return if_nametoindex(interface)

1790

1791

2105

1792

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

2106

1793

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

2107

1794

2115

1802

sys.exit()

2116

1803

if not noclose:

2117

1804

# Close all standard open file descriptors

2118

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

1805

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

2119

1806

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

2120

1807

raise OSError(errno.ENODEV,

2121

"{0} not a character device"

2122

.format(os.devnull))

1808

"%s not a character device"

1809

% os.path.devnull)

2123

1810

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

2124

1811

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

2125

1812

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

2134

1821

2135

1822

parser = argparse.ArgumentParser()

2136

1823

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

2137

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

1824

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

2138

1825

help="show version number and exit")

2139

1826

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

2140

1827

help="Bind to interface IF")

2162

1849

" system bus interface")

2163

1850

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

2164

1851

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

1852

options = parser.parse_args()

2172

1853

2173

1854

if options.check:

2186

1867

"use_dbus": "True",

2187

1868

"use_ipv6": "True",

2188

1869

"debuglevel": "",

2189

"restore": "True",

2190

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

2191

1870

}

2192

1871

2193

1872

# Parse config file for server-global settings

2210

1889

# options, if set.

2211

1890

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

2212

1891

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

2213

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

2214

"statedir"):

1892

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

2215

1893

value = getattr(options, option)

2216

1894

if value is not None:

2217

1895

server_settings[option] = value

2229

1907

debuglevel = server_settings["debuglevel"]

2230

1908

use_dbus = server_settings["use_dbus"]

2231

1909

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

1910

2244

1911

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

2245

1912

syslogger.setFormatter(logging.Formatter

2246

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

2247

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

2248

.format(server_settings

2249

["servicename"])))

1913

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

1914

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

1915

% server_settings["servicename"]))

2250

1916

2251

1917

# Parse config file with clients

2252

client_config = configparser.SafeConfigParser(Client

2253

.client_defaults)

1918

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

1919

"extended_timeout": "15m",

1920

"interval": "2m",

1921

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

1922

"host": "",

1923

"approval_delay": "0s",

1924

"approval_duration": "1s",

1925

}

1926

client_config = configparser.SafeConfigParser(client_defaults)

2254

1927

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

2255

1928

"clients.conf"))

2256

1929

2270

1943

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

2271

1944

try:

2272

1945

pidfile = open(pidfilename, "w")

2273

except IOError as e:

2274

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

2275

exc_info=e)

1946

except IOError:

1947

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

2276

1948

2277

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

1949

try:

1950

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

1951

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

1952

except KeyError:

2278

1953

try:

2279

uid = pwd.getpwnam(name).pw_uid

2280

gid = pwd.getpwnam(name).pw_gid

2281

break

1954

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

1955

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

2282

1956

except KeyError:

2283

continue

2284

else:

2285

uid = 65534

2286

gid = 65534

1957

try:

1958

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

1959

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

1960

except KeyError:

1961

uid = 65534

1962

gid = 65534

2287

1963

try:

2288

1964

os.setgid(gid)

2289

1965

os.setuid(uid)

2290

1966

except OSError as error:

2291

if error.errno != errno.EPERM:

1967

if error[0] != errno.EPERM:

2292

1968

raise error

2293

1969

1970

if not debug and not debuglevel:

1971

syslogger.setLevel(logging.WARNING)

1972

console.setLevel(logging.WARNING)

1973

if debuglevel:

1974

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

1975

syslogger.setLevel(level)

1976

console.setLevel(level)

1977

2294

1978

if debug:

2295

1979

# Enable all possible GnuTLS debugging

2296

1980

2306

1990

.gnutls_global_set_log_function(debug_gnutls))

2307

1991

2308

1992

# Redirect stdin so all checkers get /dev/null

2309

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

1993

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

2310

1994

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

2311

1995

if null > 2:

2312

1996

os.close(null)

1997

else:

1998

# No console logging

1999

logger.removeHandler(console)

2313

2000

2314

2001

# Need to fork before connecting to D-Bus

2315

2002

if not debug:

2316

2003

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

2317

2004

daemon()

2318

2005

2319

gobject.threads_init()

2320

2321

2006

global main_loop

2322

2007

# From the Avahi example code

2323

DBusGMainLoop(set_as_default=True)

2008

DBusGMainLoop(set_as_default=True )

2324

2009

main_loop = gobject.MainLoop()

2325

2010

bus = dbus.SystemBus()

2326

2011

# End of Avahi example code

2332

2017

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

2333

2018

do_not_queue=True))

2334

2019

except dbus.exceptions.NameExistsException as e:

2335

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

2020

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

2336

2021

use_dbus = False

2337

2022

server_settings["use_dbus"] = False

2338

2023

tcp_server.use_dbus = False

2339

2024

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)

2025

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

2026

servicetype = "_mandos._tcp",

2027

protocol = protocol, bus = bus)

2344

2028

if server_settings["interface"]:

2345

2029

service.interface = (if_nametoindex

2346

2030

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

2350

2034

2351

2035

client_class = Client

2352

2036

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))

2037

client_class = functools.partial(ClientDBusTransitional,

2038

bus = bus)

2039

def client_config_items(config, section):

2040

special_settings = {

2041

"approved_by_default":

2042

lambda: config.getboolean(section,

2043

"approved_by_default"),

2044

}

2045

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

2424

2046

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

2047

yield (name, special_settings[name]())

2048

except KeyError:

2049

yield (name, value)

2050

2051

tcp_server.clients.update(set(

2052

client_class(name = section,

2053

config= dict(client_config_items(

2054

client_config, section)))

2055

for section in client_config.sections()))

2449

2056

if not tcp_server.clients:

2450

2057

logger.warning("No clients defined")

2451

2058

2452

2059

if not debug:

2453

2060

try:

2454

2061

with pidfile:

2462

2069

# "pidfile" was never created

2463

2070

pass

2464

2071

del pidfilename

2072

2073

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

2465

2074

2466

2075

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

2467

2076

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

2468

2077

2469

2078

if use_dbus:

2470

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

2471

"se.bsnet.fukt.Mandos"})

2472

class MandosDBusService(DBusObjectWithProperties):

2079

class MandosDBusService(dbus.service.Object):

2473

2080

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

2474

2081

def __init__(self):

2475

2082

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

2476

2083

_interface = "se.recompile.Mandos"

2477

2084

2478

@dbus_interface_annotations(_interface)

2479

def _foo(self):

2480

return { "org.freedesktop.DBus.Property"

2481

".EmitsChangedSignal":

2482

"false"}

2483

2484

2085

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

2485

2086

def ClientAdded(self, objpath):

2486

2087

"D-Bus signal"

2500

2101

def GetAllClients(self):

2501

2102

"D-Bus method"

2502

2103

return dbus.Array(c.dbus_object_path

2503

for c in

2504

tcp_server.clients.itervalues())

2104

for c in tcp_server.clients)

2505

2105

2506

2106

@dbus.service.method(_interface,

2507

2107

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

2509

2109

"D-Bus method"

2510

2110

return dbus.Dictionary(

2511

2111

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

2512

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

2112

for c in tcp_server.clients),

2513

2113

signature="oa{sv}")

2514

2114

2515

2115

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

2516

2116

def RemoveClient(self, object_path):

2517

2117

"D-Bus method"

2518

for c in tcp_server.clients.itervalues():

2118

for c in tcp_server.clients:

2519

2119

if c.dbus_object_path == object_path:

2520

del tcp_server.clients[c.name]

2120

tcp_server.clients.remove(c)

2521

2121

c.remove_from_connection()

2522

2122

# Don't signal anything except ClientRemoved

2523

2123

c.disable(quiet=True)

2528

2128

2529

2129

del _interface

2530

2130

2531

mandos_dbus_service = MandosDBusService()

2131

class MandosDBusServiceTransitional(MandosDBusService):

2132

__metaclass__ = AlternateDBusNamesMetaclass

2133

mandos_dbus_service = MandosDBusServiceTransitional()

2532

2134

2533

2135

def cleanup():

2534

2136

"Cleanup function; run on exit"

2535

2137

service.cleanup()

2536

2138

2537

2139

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

2140

while tcp_server.clients:

2593

name, client = tcp_server.clients.popitem()

2141

client = tcp_server.clients.pop()

2594

2142

if use_dbus:

2595

2143

client.remove_from_connection()

2144

client.disable_hook = None

2596

2145

# Don't signal anything except ClientRemoved

2597

2146

client.disable(quiet=True)

2598

2147

if use_dbus:

2600

2149

mandos_dbus_service.ClientRemoved(client

2601

2150

.dbus_object_path,

2602

2151

client.name)

2603

client_settings.clear()

2604

2152

2605

2153

atexit.register(cleanup)

2606

2154

2607

for client in tcp_server.clients.itervalues():

2155

for client in tcp_server.clients:

2608

2156

if use_dbus:

2609

2157

# Emit D-Bus signal

2610

2158

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2611

# Need to initiate checking of clients

2612

if client.enabled:

2613

client.init_checker()

2159

client.enable()

2614

2160

2615

2161

tcp_server.enable()

2616

2162

tcp_server.server_activate()

2619

2165

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

2620

2166

if use_ipv6:

2621

2167

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

2622

" flowinfo %d, scope_id %d",

2623

*tcp_server.socket.getsockname())

2168

" flowinfo %d, scope_id %d"

2169

% tcp_server.socket.getsockname())

2624

2170

else: # IPv4

2625

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

2626

*tcp_server.socket.getsockname())

2171

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

2172

% tcp_server.socket.getsockname())

2627

2173

2628

2174

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

2629

2175

2632

2178

try:

2633

2179

service.activate()

2634

2180

except dbus.exceptions.DBusException as error:

2635

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

2181

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

2636

2182

cleanup()

2637

2183

sys.exit(1)

2638

2184

# End of Avahi example code

2645

2191

logger.debug("Starting main loop")

2646

2192

main_loop.run()

2647

2193

except AvahiError as error:

2648

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

2194

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

2649

2195

cleanup()

2650

2196

sys.exit(1)

2651

2197

except KeyboardInterrupt:

2656

2202

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

2657

2203

cleanup()

2658

2204

2205

2659

2206

if __name__ == '__main__':

2660

2207

main()