/mandos/release : revision 237.7.133

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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 = "1.4.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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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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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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def encrypt(self, data, password):

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

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

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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

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

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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class AvahiError(Exception):

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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.GetAlternativeServiceName(self.name))

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.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: %s"

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% unicode(error))

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

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.format(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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dbus.exceptions.DBusException):

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pass

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self.group = None

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self.remove()

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

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

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

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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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def _timedelta_to_milliseconds(td):

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_enabled: datetime.datetime(); (UTC)

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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

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attribute."""

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

482

"""

483

settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

492

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

493

"enabled")

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495

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

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.replace(" ", ""))

497

if "secret" in section:

498

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

499

elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

507

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

508

client["extended_timeout"] = string_to_delta(

509

section["extended_timeout"])

510

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

511

client["approval_delay"] = string_to_delta(

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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"]

516

client["last_approval_request"] = None

517

client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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520

return settings

521

522

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

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523

self.name = name

339

if config is None:

340

config = {}

524

# adding all client settings

525

for setting, value in settings.iteritems():

526

setattr(self, setting, value)

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if self.enabled:

529

if not hasattr(self, "last_enabled"):

530

self.last_enabled = datetime.datetime.utcnow()

531

if not hasattr(self, "expires"):

532

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

533

+ self.timeout)

534

else:

535

self.last_enabled = None

536

self.expires = None

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

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539

# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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541

# function

345

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

346

.replace(" ", ""))

347

542

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

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

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(config["secfile"])),

353

"rb") as secfile:

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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

363

self.last_checked_ok = None

364

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

365

self.extended_timeout = string_to_delta(config

366

["extended_timeout"])

367

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

368

self.disable_hook = disable_hook

543

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

544

datetime.datetime.utcnow())

545

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# attributes specific for this server instance

369

547

self.checker = None

370

548

self.checker_initiator_tag = None

371

549

self.disable_initiator_tag = None

372

self.expires = None

373

550

self.checker_callback_tag = None

374

self.checker_command = config["checker"]

375

551

self.current_checker_command = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

552

self.approved = None

380

553

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"])

385

554

self.changedstate = (multiprocessing_manager

386

555

.Condition(multiprocessing_manager

387

556

.Lock()))

557

self.client_structure = [attr for attr in

558

self.__dict__.iterkeys()

559

if not attr.startswith("_")]

560

self.client_structure.append("client_structure")

561

562

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

563

lambda obj:

564

isinstance(obj,

565

property)):

566

if not name.startswith("_"):

567

self.client_structure.append(name)

388

568

569

# Send notice to process children that client state has changed

389

570

def send_changedstate(self):

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

571

with self.changedstate:

572

self.changedstate.notify_all()

393

573

394

574

def enable(self):

395

575

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

396

576

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

397

577

# Already enabled

398

578

return

579

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

580

self.enabled = True

581

self.last_enabled = datetime.datetime.utcnow()

582

self.init_checker()

399

583

self.send_changedstate()

584

585

def disable(self, quiet=True):

586

"""Disable this client."""

587

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

588

return False

589

if not quiet:

590

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

591

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

592

gobject.source_remove(self.disable_initiator_tag)

593

self.disable_initiator_tag = None

594

self.expires = None

595

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

596

gobject.source_remove(self.checker_initiator_tag)

597

self.checker_initiator_tag = None

598

self.stop_checker()

599

self.enabled = False

600

if not quiet:

601

self.send_changedstate()

602

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

603

return False

604

605

def __del__(self):

606

self.disable()

607

608

def init_checker(self):

400

609

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

401

610

# and every interval from then on.

611

if self.checker_initiator_tag is not None:

612

gobject.source_remove(self.checker_initiator_tag)

402

613

self.checker_initiator_tag = (gobject.timeout_add

403

614

(self.interval_milliseconds(),

404

615

self.start_checker))

405

616

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

406

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

617

if self.disable_initiator_tag is not None:

618

gobject.source_remove(self.disable_initiator_tag)

407

619

self.disable_initiator_tag = (gobject.timeout_add

408

620

(self.timeout_milliseconds(),

409

621

self.disable))

410

self.enabled = True

411

self.last_enabled = datetime.datetime.utcnow()

412

622

# Also start a new checker *right now*.

413

623

self.start_checker()

414

624

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

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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

441

625

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

442

626

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

443

627

self.checker_callback_tag = None

444

628

self.checker = None

445

629

if os.WIFEXITED(condition):

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

630

self.last_checker_status = os.WEXITSTATUS(condition)

631

if self.last_checker_status == 0:

448

632

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

449

633

vars(self))

450

634

self.checked_ok()

452

636

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

453

637

vars(self))

454

638

else:

639

self.last_checker_status = -1

455

640

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

456

641

vars(self))

457

642

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

"""

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."""

464

651

if timeout is None:

465

652

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

467

653

if self.disable_initiator_tag is not None:

468

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

469

656

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

470

657

self.disable_initiator_tag = (gobject.timeout_add

471

(_timedelta_to_milliseconds

658

(timedelta_to_milliseconds

472

659

(timeout), self.disable))

473

660

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

474

661

481

668

If a checker already exists, leave it running and do

482

669

nothing."""

483

670

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

484

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

485

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

486

# client would inevitably timeout, since no checker would get

487

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

671

# 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

488

675

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

489

676

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

490

677

# should be.

504

691

self.current_checker_command)

505

692

# Start a new checker if needed

506

693

if self.checker is None:

694

# Escape attributes for the shell

695

escaped_attrs = dict(

696

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

697

for attr in

698

self.runtime_expansions)

507

699

try:

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

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

526

705

self.current_checker_command = command

527

706

try:

528

707

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

534

713

self.checker = subprocess.Popen(command,

535

714

close_fds=True,

536

715

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)

547

716

except OSError as error:

548

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

549

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)

550

729

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

551

730

return True

552

731

559

738

return

560

739

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

561

740

try:

562

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

741

self.checker.terminate()

563

742

#time.sleep(0.5)

564

743

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

565

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

744

# self.checker.kill()

566

745

except OSError as error:

567

746

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

568

747

raise

585

764

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

586

765

if byte_arrays and signature != "ay":

587

766

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

588

" signature %r" % signature)

767

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

589

768

def decorator(func):

590

769

func._dbus_is_property = True

591

770

func._dbus_interface = dbus_interface

599

778

return decorator

600

779

601

780

781

def dbus_interface_annotations(dbus_interface):

782

"""Decorator for marking functions returning interface annotations

783

784

Usage:

785

786

@dbus_interface_annotations("org.example.Interface")

787

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

788

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

789

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

790

"false"}

791

"""

792

def decorator(func):

793

func._dbus_is_interface = True

794

func._dbus_interface = dbus_interface

795

func._dbus_name = dbus_interface

796

return func

797

return decorator

798

799

800

def dbus_annotations(annotations):

801

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

802

Usage:

803

804

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

805

access="r")

806

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

807

"org.freedesktop.DBus.Property."

808

"EmitsChangedSignal": "false"})

809

def Property_dbus_property(self):

810

return dbus.Boolean(False)

811

"""

812

def decorator(func):

813

func._dbus_annotations = annotations

814

return func

815

return decorator

816

817

602

818

class DBusPropertyException(dbus.exceptions.DBusException):

603

819

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

604

820

"""

627

843

"""

628

844

629

845

@staticmethod

630

def _is_dbus_property(obj):

631

return getattr(obj, "_dbus_is_property", False)

846

def _is_dbus_thing(thing):

847

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

848

849

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

850

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

851

"""

852

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

853

False)

632

854

633

def _get_all_dbus_properties(self):

855

def _get_all_dbus_things(self, thing):

634

856

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

635

857

"""

636

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

858

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

859

name),

860

athing.__get__(self))

637

861

for cls in self.__class__.__mro__

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

862

for name, athing in

863

inspect.getmembers(cls,

864

self._is_dbus_thing(thing)))

640

865

641

866

def _get_dbus_property(self, interface_name, property_name):

642

867

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

644

869

"""

645

870

for cls in self.__class__.__mro__:

646

871

for name, value in (inspect.getmembers

647

(cls, self._is_dbus_property)):

872

(cls,

873

self._is_dbus_thing("property"))):

648

874

if (value._dbus_name == property_name

649

875

and value._dbus_interface == interface_name):

650

876

return value.__get__(self)

679

905

# signatures other than "ay".

680

906

if prop._dbus_signature != "ay":

681

907

raise ValueError

682

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

683

for byte in value))

908

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

909

for byte in value))

684

910

prop(value)

685

911

686

912

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

691

917

692

918

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

693

919

"""

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

920

properties = {}

921

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

696

922

if (interface_name

697

923

and interface_name != prop._dbus_interface):

698

924

# Interface non-empty but did not match

702

928

continue

703

929

value = prop()

704

930

if not hasattr(value, "variant_level"):

705

all[name] = value

931

properties[name] = value

706

932

continue

707

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

708

value.variant_level+1)

709

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

933

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

934

value.variant_level+1)

935

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

710

936

711

937

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

712

938

out_signature="s",

713

939

path_keyword='object_path',

714

940

connection_keyword='connection')

715

941

def Introspect(self, object_path, connection):

716

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

942

"""Overloading of standard D-Bus method.

943

944

Inserts property tags and interface annotation tags.

717

945

"""

718

946

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

719

947

connection)

726

954

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

727

955

return e

728

956

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

957

# Add property tags

729

958

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

730

959

for name, prop

731

in self._get_all_dbus_properties()

960

in self._get_all_dbus_things("property")

732

961

if prop._dbus_interface

733

962

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

734

963

if_tag.appendChild(tag)

964

# Add annotation tags

965

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

966

for tag in if_tag.getElementsByTagName(typ):

967

annots = dict()

968

for name, prop in (self.

969

_get_all_dbus_things(typ)):

970

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

971

and prop._dbus_interface

972

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

973

annots.update(getattr

974

(prop,

975

"_dbus_annotations",

976

{}))

977

for name, value in annots.iteritems():

978

ann_tag = document.createElement(

979

"annotation")

980

ann_tag.setAttribute("name", name)

981

ann_tag.setAttribute("value", value)

982

tag.appendChild(ann_tag)

983

# Add interface annotation tags

984

for annotation, value in dict(

985

itertools.chain.from_iterable(

986

annotations().iteritems()

987

for name, annotations in

988

self._get_all_dbus_things("interface")

989

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

990

)).iteritems():

991

ann_tag = document.createElement("annotation")

992

ann_tag.setAttribute("name", annotation)

993

ann_tag.setAttribute("value", value)

994

if_tag.appendChild(ann_tag)

735

995

# Add the names to the return values for the

736

996

# "org.freedesktop.DBus.Properties" methods

737

997

if (if_tag.getAttribute("name")

752

1012

except (AttributeError, xml.dom.DOMException,

753

1013

xml.parsers.expat.ExpatError) as error:

754

1014

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

755

error)

1015

exc_info=error)

756

1016

return xmlstring

757

1017

758

1018

763

1023

return dbus.String(dt.isoformat(),

764

1024

variant_level=variant_level)

765

1025

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.

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).

770

1049

"""

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):

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):

778

1057

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

779

1058

# with the wrong interface name

780

1059

if (not hasattr(attribute, "_dbus_interface")

781

1060

or not attribute._dbus_interface

782

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

1061

.startswith(orig_interface_name)):

783

1062

continue

784

1063

# Create an alternate D-Bus interface name based on

785

1064

# the current name

786

1065

alt_interface = (attribute._dbus_interface

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1066

.replace(orig_interface_name,

1067

alt_interface_name))

1068

interface_names.add(alt_interface)

789

1069

# Is this a D-Bus signal?

790

1070

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

791

1071

# Extract the original non-method function by

806

1086

nonmethod_func.func_name,

807

1087

nonmethod_func.func_defaults,

808

1088

nonmethod_func.func_closure)))

1089

# Copy annotations, if any

1090

try:

1091

new_function._dbus_annotations = (

1092

dict(attribute._dbus_annotations))

1093

except AttributeError:

1094

pass

809

1095

# Define a creator of a function to call both the

810

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

811

# signals gets sent when the function is called

1096

# original and alternate functions, so both the

1097

# original and alternate signals gets sent when

1098

# the function is called

812

1099

def fixscope(func1, func2):

813

1100

"""This function is a scope container to pass

814

1101

func1 and func2 to the "call_both" function

821

1108

return call_both

822

1109

# Create the "call_both" function and add it to

823

1110

# the class

824

attr[attrname] = fixscope(attribute,

825

new_function)

1111

attr[attrname] = fixscope(attribute, new_function)

826

1112

# Is this a D-Bus method?

827

1113

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

828

1114

# Create a new, but exactly alike, function

839

1125

attribute.func_name,

840

1126

attribute.func_defaults,

841

1127

attribute.func_closure)))

1128

# Copy annotations, if any

1129

try:

1130

attr[attrname]._dbus_annotations = (

1131

dict(attribute._dbus_annotations))

1132

except AttributeError:

1133

pass

842

1134

# Is this a D-Bus property?

843

1135

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

844

1136

# Create a new, but exactly alike, function

858

1150

attribute.func_name,

859

1151

attribute.func_defaults,

860

1152

attribute.func_closure)))

861

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

862

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"})

863

1198

class ClientDBus(Client, DBusObjectWithProperties):

864

1199

"""A Client class using D-Bus

865

1200

874

1209

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

875

1210

876

1211

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

877

self._approvals_pending = 0

878

1212

self.bus = bus

879

1213

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

880

1214

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

886

1220

("/clients/" + client_object_name))

887

1221

DBusObjectWithProperties.__init__(self, self.bus,

888

1222

self.dbus_object_path)

889

1223

890

1224

def notifychangeproperty(transform_func,

891

1225

dbus_name, type_func=lambda x: x,

892

1226

variant_level=1):

893

1227

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

894

1228

its changes to DBus.

895

1229

896

1230

transform_fun: Function that takes a value and a variant_level

897

1231

and transforms it to a D-Bus type.

898

1232

dbus_name: D-Bus name of the variable

915

1249

916

1250

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

917

1251

918

919

1252

expires = notifychangeproperty(datetime_to_dbus, "Expires")

920

1253

approvals_pending = notifychangeproperty(dbus.Boolean,

921

1254

"ApprovalPending",

928

1261

checker is not None)

929

1262

last_checked_ok = notifychangeproperty(datetime_to_dbus,

930

1263

"LastCheckedOK")

1264

last_checker_status = notifychangeproperty(dbus.Int16,

1265

"LastCheckerStatus")

931

1266

last_approval_request = notifychangeproperty(

932

1267

datetime_to_dbus, "LastApprovalRequest")

933

1268

approved_by_default = notifychangeproperty(dbus.Boolean,

934

1269

"ApprovedByDefault")

935

approval_delay = notifychangeproperty(dbus.UInt16,

1270

approval_delay = notifychangeproperty(dbus.UInt64,

936

1271

"ApprovalDelay",

937

1272

type_func =

938

_timedelta_to_milliseconds)

1273

timedelta_to_milliseconds)

939

1274

approval_duration = notifychangeproperty(

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1275

dbus.UInt64, "ApprovalDuration",

1276

type_func = timedelta_to_milliseconds)

942

1277

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

943

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

1278

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

944

1279

type_func =

945

_timedelta_to_milliseconds)

1280

timedelta_to_milliseconds)

946

1281

extended_timeout = notifychangeproperty(

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1282

dbus.UInt64, "ExtendedTimeout",

1283

type_func = timedelta_to_milliseconds)

1284

interval = notifychangeproperty(dbus.UInt64,

950

1285

"Interval",

951

1286

type_func =

952

_timedelta_to_milliseconds)

1287

timedelta_to_milliseconds)

953

1288

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

954

1289

955

1290

del notifychangeproperty

997

1332

return r

998

1333

999

1334

def _reset_approved(self):

1000

self._approved = None

1335

self.approved = None

1001

1336

return False

1002

1337

1003

1338

def approve(self, value=True):

1004

self.send_changedstate()

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1339

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

1007

1341

(self.approval_duration),

1008

1342

self._reset_approved)

1009

1343

self.send_changedstate()

1010

1344

1011

1345

## D-Bus methods, signals & properties

1012

1346

_interface = "se.recompile.Mandos.Client"

1013

1347

1348

## Interfaces

1349

1350

@dbus_interface_annotations(_interface)

1351

def _foo(self):

1352

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

1353

"false"}

1354

1014

1355

## Signals

1015

1356

1016

1357

# CheckerCompleted - signal

1115

1456

access="readwrite")

1116

1457

def ApprovalDuration_dbus_property(self, value=None):

1117

1458

if value is None: # get

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1459

return dbus.UInt64(timedelta_to_milliseconds(

1119

1460

self.approval_duration))

1120

1461

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

1121

1462

1135

1476

def Host_dbus_property(self, value=None):

1136

1477

if value is None: # get

1137

1478

return dbus.String(self.host)

1138

self.host = value

1479

self.host = unicode(value)

1139

1480

1140

1481

# Created - property

1141

1482

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

1142

1483

def Created_dbus_property(self):

1143

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

1484

return datetime_to_dbus(self.created)

1144

1485

1145

1486

# LastEnabled - property

1146

1487

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

1167

1508

return

1168

1509

return datetime_to_dbus(self.last_checked_ok)

1169

1510

1511

# LastCheckerStatus - property

1512

@dbus_service_property(_interface, signature="n",

1513

access="read")

1514

def LastCheckerStatus_dbus_property(self):

1515

return dbus.Int16(self.last_checker_status)

1516

1170

1517

# Expires - property

1171

1518

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

1172

1519

def Expires_dbus_property(self):

1183

1530

def Timeout_dbus_property(self, value=None):

1184

1531

if value is None: # get

1185

1532

return dbus.UInt64(self.timeout_milliseconds())

1533

old_timeout = self.timeout

1186

1534

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

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))

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))

1207

1551

1208

1552

# ExtendedTimeout - property

1209

1553

@dbus_service_property(_interface, signature="t",

1222

1566

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

1223

1567

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

1224

1568

return

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

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

1230

1575

1231

1576

# Checker - property

1232

1577

@dbus_service_property(_interface, signature="s",

1234

1579

def Checker_dbus_property(self, value=None):

1235

1580

if value is None: # get

1236

1581

return dbus.String(self.checker_command)

1237

self.checker_command = value

1582

self.checker_command = unicode(value)

1238

1583

1239

1584

# CheckerRunning - property

1240

1585

@dbus_service_property(_interface, signature="b",

1269

1614

raise KeyError()

1270

1615

1271

1616

def __getattribute__(self, name):

1272

if(name == '_pipe'):

1617

if name == '_pipe':

1273

1618

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

1274

1619

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

1275

1620

data = self._pipe.recv()

1282

1627

return func

1283

1628

1284

1629

def __setattr__(self, name, value):

1285

if(name == '_pipe'):

1630

if name == '_pipe':

1286

1631

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

1287

1632

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

1288

1633

1289

class ClientDBusTransitional(ClientDBus):

1290

__metaclass__ = AlternateDBusNamesMetaclass

1291

1634

1292

1635

class ClientHandler(socketserver.BaseRequestHandler, object):

1293

1636

"""A class to handle client connections.

1376

1719

client.Rejected("Disabled")

1377

1720

return

1378

1721

1379

if client._approved or not client.approval_delay:

1722

if client.approved or not client.approval_delay:

1380

1723

#We are approved or approval is disabled

1381

1724

break

1382

elif client._approved is None:

1725

elif client.approved is None:

1383

1726

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

1384

1727

client.name)

1385

1728

if self.server.use_dbus:

1398

1741

#wait until timeout or approved

1399

1742

time = datetime.datetime.now()

1400

1743

client.changedstate.acquire()

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1404

1747

client.changedstate.release()

1405

1748

time2 = datetime.datetime.now()

1406

1749

if (time2 - time) >= delay:

1422

1765

try:

1423

1766

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

1424

1767

except gnutls.errors.GNUTLSError as error:

1425

logger.warning("gnutls send failed")

1768

logger.warning("gnutls send failed",

1769

exc_info=error)

1426

1770

return

1427

1771

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

1428

1772

sent, len(client.secret)

1431

1775

1432

1776

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

1433

1777

# bump the timeout using extended_timeout

1434

client.checked_ok(client.extended_timeout)

1778

client.bump_timeout(client.extended_timeout)

1435

1779

if self.server.use_dbus:

1436

1780

# Emit D-Bus signal

1437

1781

client.GotSecret()

1442

1786

try:

1443

1787

session.bye()

1444

1788

except gnutls.errors.GNUTLSError as error:

1445

logger.warning("GnuTLS bye failed")

1789

logger.warning("GnuTLS bye failed",

1790

exc_info=error)

1446

1791

1447

1792

@staticmethod

1448

1793

def peer_certificate(session):

1504

1849

# Convert the buffer to a Python bytestring

1505

1850

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

1506

1851

# Convert the bytestring to hexadecimal notation

1507

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

1852

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

1508

1853

return hex_fpr

1509

1854

1510

1855

1513

1858

def sub_process_main(self, request, address):

1514

1859

try:

1515

1860

self.finish_request(request, address)

1516

except:

1861

except Exception:

1517

1862

self.handle_error(request, address)

1518

1863

self.close_request(request)

1519

1864

1520

1865

def process_request(self, request, address):

1521

1866

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

1522

1867

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

1523

args = (request,

1524

address))

1868

args = (request, address))

1525

1869

proc.start()

1526

1870

return proc

1527

1871

1577

1921

str(self.interface

1578

1922

+ '\0'))

1579

1923

except socket.error as error:

1580

if error[0] == errno.EPERM:

1924

if error.errno == errno.EPERM:

1581

1925

logger.error("No permission to"

1582

1926

" bind to interface %s",

1583

1927

self.interface)

1584

elif error[0] == errno.ENOPROTOOPT:

1928

elif error.errno == errno.ENOPROTOOPT:

1585

1929

logger.error("SO_BINDTODEVICE not available;"

1586

1930

" cannot bind to interface %s",

1587

1931

self.interface)

1932

elif error.errno == errno.ENODEV:

1933

logger.error("Interface %s does not"

1934

" exist, cannot bind",

1935

self.interface)

1588

1936

else:

1589

1937

raise

1590

1938

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

1624

1972

self.enabled = False

1625

1973

self.clients = clients

1626

1974

if self.clients is None:

1627

self.clients = set()

1975

self.clients = {}

1628

1976

self.use_dbus = use_dbus

1629

1977

self.gnutls_priority = gnutls_priority

1630

1978

IPv6_TCPServer.__init__(self, server_address,

1649

1997

1650

1998

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

1651

1999

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)

1666

2000

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

1667

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

2001

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

1668

2002

# Wait for other process to exit

1669

2003

proc.join()

1670

2004

return False

1677

2011

fpr = request[1]

1678

2012

address = request[2]

1679

2013

1680

for c in self.clients:

2014

for c in self.clients.itervalues():

1681

2015

if c.fingerprint == fpr:

1682

2016

client = c

1683

2017

break

1760

2094

elif suffix == "w":

1761

2095

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

1762

2096

else:

1763

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

2097

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

2098

.format(suffix))

1764

2099

except (ValueError, IndexError) as e:

1765

2100

raise ValueError(*(e.args))

1766

2101

timevalue += delta

1767

2102

return timevalue

1768

2103

1769

2104

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

1794

2105

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

1795

2106

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

1796

2107

1804

2115

sys.exit()

1805

2116

if not noclose:

1806

2117

# Close all standard open file descriptors

1807

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

2118

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

1808

2119

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

1809

2120

raise OSError(errno.ENODEV,

1810

"%s not a character device"

1811

% os.path.devnull)

2121

"{0} not a character device"

2122

.format(os.devnull))

1812

2123

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

1813

2124

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

1814

2125

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

1823

2134

1824

2135

parser = argparse.ArgumentParser()

1825

2136

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

1826

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

2137

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

1827

2138

help="show version number and exit")

1828

2139

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

1829

2140

help="Bind to interface IF")

1851

2162

" system bus interface")

1852

2163

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

1853

2164

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

1854

2171

options = parser.parse_args()

1855

2172

1856

2173

if options.check:

1869

2186

"use_dbus": "True",

1870

2187

"use_ipv6": "True",

1871

2188

"debuglevel": "",

2189

"restore": "True",

2190

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

1872

2191

}

1873

2192

1874

2193

# Parse config file for server-global settings

1891

2210

# options, if set.

1892

2211

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

1893

2212

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

1894

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

2213

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

2214

"statedir"):

1895

2215

value = getattr(options, option)

1896

2216

if value is not None:

1897

2217

server_settings[option] = value

1909

2229

debuglevel = server_settings["debuglevel"]

1910

2230

use_dbus = server_settings["use_dbus"]

1911

2231

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)

1912

2243

1913

2244

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

1914

2245

syslogger.setFormatter(logging.Formatter

1915

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

1916

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

1917

% server_settings["servicename"]))

2246

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

2247

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

2248

.format(server_settings

2249

["servicename"])))

1918

2250

1919

2251

# Parse config file with clients

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)

2252

client_config = configparser.SafeConfigParser(Client

2253

.client_defaults)

1929

2254

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

1930

2255

"clients.conf"))

1931

2256

1945

2270

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

1946

2271

try:

1947

2272

pidfile = open(pidfilename, "w")

1948

except IOError:

1949

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

2273

except IOError as e:

2274

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

2275

exc_info=e)

1950

2276

1951

try:

1952

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

1953

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

1954

except KeyError:

2277

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

1955

2278

try:

1956

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

1957

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

2279

uid = pwd.getpwnam(name).pw_uid

2280

gid = pwd.getpwnam(name).pw_gid

2281

break

1958

2282

except KeyError:

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

2283

continue

2284

else:

2285

uid = 65534

2286

gid = 65534

1965

2287

try:

1966

2288

os.setgid(gid)

1967

2289

os.setuid(uid)

1968

2290

except OSError as error:

1969

if error[0] != errno.EPERM:

2291

if error.errno != errno.EPERM:

1970

2292

raise error

1971

2293

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

1980

2294

if debug:

1981

2295

# Enable all possible GnuTLS debugging

1982

2296

1992

2306

.gnutls_global_set_log_function(debug_gnutls))

1993

2307

1994

2308

# Redirect stdin so all checkers get /dev/null

1995

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

2309

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

1996

2310

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

1997

2311

if null > 2:

1998

2312

os.close(null)

1999

else:

2000

# No console logging

2001

logger.removeHandler(console)

2002

2313

2003

2314

# Need to fork before connecting to D-Bus

2004

2315

if not debug:

2005

2316

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

2006

2317

daemon()

2007

2318

2319

gobject.threads_init()

2320

2008

2321

global main_loop

2009

2322

# From the Avahi example code

2010

DBusGMainLoop(set_as_default=True )

2323

DBusGMainLoop(set_as_default=True)

2011

2324

main_loop = gobject.MainLoop()

2012

2325

bus = dbus.SystemBus()

2013

2326

# End of Avahi example code

2019

2332

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

2020

2333

do_not_queue=True))

2021

2334

except dbus.exceptions.NameExistsException as e:

2022

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

2335

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

2023

2336

use_dbus = False

2024

2337

server_settings["use_dbus"] = False

2025

2338

tcp_server.use_dbus = False

2026

2339

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2027

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

2028

servicetype = "_mandos._tcp",

2029

protocol = protocol, bus = bus)

2340

service = AvahiServiceToSyslog(name =

2341

server_settings["servicename"],

2342

servicetype = "_mandos._tcp",

2343

protocol = protocol, bus = bus)

2030

2344

if server_settings["interface"]:

2031

2345

service.interface = (if_nametoindex

2032

2346

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

2036

2350

2037

2351

client_class = Client

2038

2352

if use_dbus:

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):

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))

2048

2424

try:

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()))

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

2058

2449

if not tcp_server.clients:

2059

2450

logger.warning("No clients defined")

2060

2451

2061

2452

if not debug:

2062

2453

try:

2063

2454

with pidfile:

2071

2462

# "pidfile" was never created

2072

2463

pass

2073

2464

del pidfilename

2074

2075

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

2076

2465

2077

2466

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

2078

2467

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

2079

2468

2080

2469

if use_dbus:

2081

class MandosDBusService(dbus.service.Object):

2470

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

2471

"se.bsnet.fukt.Mandos"})

2472

class MandosDBusService(DBusObjectWithProperties):

2082

2473

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

2083

2474

def __init__(self):

2084

2475

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

2085

2476

_interface = "se.recompile.Mandos"

2086

2477

2478

@dbus_interface_annotations(_interface)

2479

def _foo(self):

2480

return { "org.freedesktop.DBus.Property"

2481

".EmitsChangedSignal":

2482

"false"}

2483

2087

2484

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

2088

2485

def ClientAdded(self, objpath):

2089

2486

"D-Bus signal"

2103

2500

def GetAllClients(self):

2104

2501

"D-Bus method"

2105

2502

return dbus.Array(c.dbus_object_path

2106

for c in tcp_server.clients)

2503

for c in

2504

tcp_server.clients.itervalues())

2107

2505

2108

2506

@dbus.service.method(_interface,

2109

2507

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

2111

2509

"D-Bus method"

2112

2510

return dbus.Dictionary(

2113

2511

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

2114

for c in tcp_server.clients),

2512

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

2115

2513

signature="oa{sv}")

2116

2514

2117

2515

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

2118

2516

def RemoveClient(self, object_path):

2119

2517

"D-Bus method"

2120

for c in tcp_server.clients:

2518

for c in tcp_server.clients.itervalues():

2121

2519

if c.dbus_object_path == object_path:

2122

tcp_server.clients.remove(c)

2520

del tcp_server.clients[c.name]

2123

2521

c.remove_from_connection()

2124

2522

# Don't signal anything except ClientRemoved

2125

2523

c.disable(quiet=True)

2130

2528

2131

2529

del _interface

2132

2530

2133

class MandosDBusServiceTransitional(MandosDBusService):

2134

__metaclass__ = AlternateDBusNamesMetaclass

2135

mandos_dbus_service = MandosDBusServiceTransitional()

2531

mandos_dbus_service = MandosDBusService()

2136

2532

2137

2533

def cleanup():

2138

2534

"Cleanup function; run on exit"

2139

2535

service.cleanup()

2140

2536

2141

2537

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

2142

2592

while tcp_server.clients:

2143

client = tcp_server.clients.pop()

2593

name, client = tcp_server.clients.popitem()

2144

2594

if use_dbus:

2145

2595

client.remove_from_connection()

2146

client.disable_hook = None

2147

2596

# Don't signal anything except ClientRemoved

2148

2597

client.disable(quiet=True)

2149

2598

if use_dbus:

2151

2600

mandos_dbus_service.ClientRemoved(client

2152

2601

.dbus_object_path,

2153

2602

client.name)

2603

client_settings.clear()

2154

2604

2155

2605

atexit.register(cleanup)

2156

2606

2157

for client in tcp_server.clients:

2607

for client in tcp_server.clients.itervalues():

2158

2608

if use_dbus:

2159

2609

# Emit D-Bus signal

2160

2610

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2161

client.enable()

2611

# Need to initiate checking of clients

2612

if client.enabled:

2613

client.init_checker()

2162

2614

2163

2615

tcp_server.enable()

2164

2616

tcp_server.server_activate()

2167

2619

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

2168

2620

if use_ipv6:

2169

2621

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

2170

" flowinfo %d, scope_id %d"

2171

% tcp_server.socket.getsockname())

2622

" flowinfo %d, scope_id %d",

2623

*tcp_server.socket.getsockname())

2172

2624

else: # IPv4

2173

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

2174

% tcp_server.socket.getsockname())

2625

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

2626

*tcp_server.socket.getsockname())

2175

2627

2176

2628

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

2177

2629

2180

2632

try:

2181

2633

service.activate()

2182

2634

except dbus.exceptions.DBusException as error:

2183

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

2635

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

2184

2636

cleanup()

2185

2637

sys.exit(1)

2186

2638

# End of Avahi example code

2193

2645

logger.debug("Starting main loop")

2194

2646

main_loop.run()

2195

2647

except AvahiError as error:

2196

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

2648

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

2197

2649

cleanup()

2198

2650

sys.exit(1)

2199

2651

except KeyboardInterrupt:

2204

2656

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

2205

2657

cleanup()

2206

2658

2207

2208

2659

if __name__ == '__main__':

2209

2660

main()