/mandos/release : revision 237.16.24

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# "AvahiService" class, and some lines in "main".

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#

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# Everything else is

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#

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# This program is free software: you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.5.3"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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version = "1.4.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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def encrypt(self, data, password):

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

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

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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

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

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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.GetAlternativeServiceName(self.name))

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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self.server_state_changed(self.server.GetState())

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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

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

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

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

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"extended_timeout": "15m",

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"interval": "2m",

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

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"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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return _timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return _timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return _timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

475

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.

478

"""

479

settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

490

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

492

.replace(" ", ""))

493

if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

500

else:

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

502

.format(section))

503

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

504

client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

506

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

507

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"])

511

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

512

client["last_approval_request"] = None

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client["last_checked_ok"] = None

514

client["last_checker_status"] = -2

515

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return settings

517

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

332

return _timedelta_to_milliseconds(self.approval_delay)

333

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

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

336

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

337

attribute."""

519

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self.name = name

520

# adding all client settings

521

for setting, value in settings.iteritems():

522

setattr(self, setting, value)

523

524

if self.enabled:

525

if not hasattr(self, "last_enabled"):

526

self.last_enabled = datetime.datetime.utcnow()

527

if not hasattr(self, "expires"):

528

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

529

+ self.timeout)

530

else:

531

self.last_enabled = None

532

self.expires = None

533

339

if config is None:

340

config = {}

534

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

535

342

# Uppercase and remove spaces from fingerprint for later

536

343

# comparison purposes with return value from the fingerprint()

537

344

# function

345

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

346

.replace(" ", ""))

538

347

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

539

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

540

datetime.datetime.utcnow())

541

542

# attributes specific for this server instance

348

if "secret" in config:

349

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

350

elif "secfile" in config:

351

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

352

(config["secfile"])),

353

"rb") as secfile:

354

self.secret = secfile.read()

355

else:

356

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

357

% self.name)

358

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

359

self.created = datetime.datetime.utcnow()

360

self.enabled = False

361

self.last_approval_request = None

362

self.last_enabled = None

363

self.last_checked_ok = None

364

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

365

self.extended_timeout = string_to_delta(config

366

["extended_timeout"])

367

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

368

self.disable_hook = disable_hook

543

369

self.checker = None

544

370

self.checker_initiator_tag = None

545

371

self.disable_initiator_tag = None

372

self.expires = None

546

373

self.checker_callback_tag = None

374

self.checker_command = config["checker"]

547

375

self.current_checker_command = None

548

self.approved = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

549

380

self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

384

config["approval_duration"])

550

385

self.changedstate = (multiprocessing_manager

551

386

.Condition(multiprocessing_manager

552

387

.Lock()))

553

self.client_structure = [attr for attr in

554

self.__dict__.iterkeys()

555

if not attr.startswith("_")]

556

self.client_structure.append("client_structure")

557

558

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

559

lambda obj:

560

isinstance(obj,

561

property)):

562

if not name.startswith("_"):

563

self.client_structure.append(name)

564

388

565

# Send notice to process children that client state has changed

566

389

def send_changedstate(self):

567

with self.changedstate:

568

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

569

393

570

394

def enable(self):

571

395

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

573

397

# Already enabled

574

398

return

575

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

576

406

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

407

self.disable_initiator_tag = (gobject.timeout_add

408

(self.timeout_milliseconds(),

409

self.disable))

577

410

self.enabled = True

578

411

self.last_enabled = datetime.datetime.utcnow()

579

self.init_checker()

412

# Also start a new checker *right now*.

413

self.start_checker()

580

414

581

415

def disable(self, quiet=True):

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416

"""Disable this client."""

594

428

gobject.source_remove(self.checker_initiator_tag)

595

429

self.checker_initiator_tag = None

596

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

597

433

self.enabled = False

598

434

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

599

435

return False

600

436

601

437

def __del__(self):

438

self.disable_hook = None

602

439

self.disable()

603

440

604

def init_checker(self):

605

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

606

# and every interval from then on.

607

self.checker_initiator_tag = (gobject.timeout_add

608

(self.interval_milliseconds(),

609

self.start_checker))

610

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

611

self.disable_initiator_tag = (gobject.timeout_add

612

(self.timeout_milliseconds(),

613

self.disable))

614

# Also start a new checker *right now*.

615

self.start_checker()

616

617

441

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

618

442

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

619

443

self.checker_callback_tag = None

620

444

self.checker = None

621

445

if os.WIFEXITED(condition):

622

self.last_checker_status = os.WEXITSTATUS(condition)

623

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

624

448

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

625

449

vars(self))

626

450

self.checked_ok()

628

452

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

629

453

vars(self))

630

454

else:

631

self.last_checker_status = -1

632

455

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

633

456

vars(self))

634

457

635

def checked_ok(self):

636

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

637

self.last_checked_ok = datetime.datetime.utcnow()

638

self.last_checker_status = 0

639

self.bump_timeout()

640

641

def bump_timeout(self, timeout=None):

642

"""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

"""

643

464

if timeout is None:

644

465

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

645

467

if self.disable_initiator_tag is not None:

646

468

gobject.source_remove(self.disable_initiator_tag)

647

469

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

648

470

self.disable_initiator_tag = (gobject.timeout_add

649

(timedelta_to_milliseconds

471

(_timedelta_to_milliseconds

650

472

(timeout), self.disable))

651

473

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

652

474

659

481

If a checker already exists, leave it running and do

660

482

nothing."""

661

483

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

662

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

663

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

664

# would inevitably timeout, since no checker would get a

665

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

484

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

485

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

486

# client would inevitably timeout, since no checker would get

487

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

666

488

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

667

489

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

668

490

# should be.

698

520

try:

699

521

command = self.checker_command % escaped_attrs

700

522

except TypeError as error:

701

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

702

self.checker_command, exc_info=error)

523

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

524

' %s', self.checker_command, error)

703

525

return True # Try again later

704

526

self.current_checker_command = command

705

527

try:

723

545

gobject.source_remove(self.checker_callback_tag)

724

546

self.checker_callback(pid, status, command)

725

547

except OSError as error:

726

logger.error("Failed to start subprocess",

727

exc_info=error)

548

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

549

error)

728

550

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

729

551

return True

730

552

737

559

return

738

560

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

739

561

try:

740

self.checker.terminate()

562

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

741

563

#time.sleep(0.5)

742

564

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

743

# self.checker.kill()

565

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

744

566

except OSError as error:

745

567

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

746

568

raise

763

585

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

764

586

if byte_arrays and signature != "ay":

765

587

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

766

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

588

" signature %r" % signature)

767

589

def decorator(func):

768

590

func._dbus_is_property = True

769

591

func._dbus_interface = dbus_interface

777

599

return decorator

778

600

779

601

780

def dbus_interface_annotations(dbus_interface):

781

"""Decorator for marking functions returning interface annotations

782

783

Usage:

784

785

@dbus_interface_annotations("org.example.Interface")

786

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

787

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

788

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

789

"false"}

790

"""

791

def decorator(func):

792

func._dbus_is_interface = True

793

func._dbus_interface = dbus_interface

794

func._dbus_name = dbus_interface

795

return func

796

return decorator

797

798

799

def dbus_annotations(annotations):

800

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

801

Usage:

802

803

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

804

access="r")

805

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

806

"org.freedesktop.DBus.Property."

807

"EmitsChangedSignal": "false"})

808

def Property_dbus_property(self):

809

return dbus.Boolean(False)

810

"""

811

def decorator(func):

812

func._dbus_annotations = annotations

813

return func

814

return decorator

815

816

817

602

class DBusPropertyException(dbus.exceptions.DBusException):

818

603

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

819

604

"""

842

627

"""

843

628

844

629

@staticmethod

845

def _is_dbus_thing(thing):

846

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

847

848

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

849

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

850

"""

851

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

852

False)

630

def _is_dbus_property(obj):

631

return getattr(obj, "_dbus_is_property", False)

853

632

854

def _get_all_dbus_things(self, thing):

633

def _get_all_dbus_properties(self):

855

634

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

856

635

"""

857

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

858

name),

859

athing.__get__(self))

636

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

860

637

for cls in self.__class__.__mro__

861

for name, athing in

862

inspect.getmembers(cls,

863

self._is_dbus_thing(thing)))

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

864

640

865

641

def _get_dbus_property(self, interface_name, property_name):

866

642

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

868

644

"""

869

645

for cls in self.__class__.__mro__:

870

646

for name, value in (inspect.getmembers

871

(cls,

872

self._is_dbus_thing("property"))):

647

(cls, self._is_dbus_property)):

873

648

if (value._dbus_name == property_name

874

649

and value._dbus_interface == interface_name):

875

650

return value.__get__(self)

904

679

# signatures other than "ay".

905

680

if prop._dbus_signature != "ay":

906

681

raise ValueError

907

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

908

for byte in value))

682

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

683

for byte in value))

909

684

prop(value)

910

685

911

686

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

916

691

917

692

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

918

693

"""

919

properties = {}

920

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

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

921

696

if (interface_name

922

697

and interface_name != prop._dbus_interface):

923

698

# Interface non-empty but did not match

927

702

continue

928

703

value = prop()

929

704

if not hasattr(value, "variant_level"):

930

properties[name] = value

705

all[name] = value

931

706

continue

932

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

933

value.variant_level+1)

934

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

707

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

708

value.variant_level+1)

709

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

935

710

936

711

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

937

712

out_signature="s",

938

713

path_keyword='object_path',

939

714

connection_keyword='connection')

940

715

def Introspect(self, object_path, connection):

941

"""Overloading of standard D-Bus method.

942

943

Inserts property tags and interface annotation tags.

716

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

944

717

"""

945

718

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

946

719

connection)

953

726

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

954

727

return e

955

728

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

956

# Add property tags

957

729

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

958

730

for name, prop

959

in self._get_all_dbus_things("property")

731

in self._get_all_dbus_properties()

960

732

if prop._dbus_interface

961

733

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

962

734

if_tag.appendChild(tag)

963

# Add annotation tags

964

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

965

for tag in if_tag.getElementsByTagName(typ):

966

annots = dict()

967

for name, prop in (self.

968

_get_all_dbus_things(typ)):

969

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

970

and prop._dbus_interface

971

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

972

annots.update(getattr

973

(prop,

974

"_dbus_annotations",

975

{}))

976

for name, value in annots.iteritems():

977

ann_tag = document.createElement(

978

"annotation")

979

ann_tag.setAttribute("name", name)

980

ann_tag.setAttribute("value", value)

981

tag.appendChild(ann_tag)

982

# Add interface annotation tags

983

for annotation, value in dict(

984

itertools.chain.from_iterable(

985

annotations().iteritems()

986

for name, annotations in

987

self._get_all_dbus_things("interface")

988

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

989

)).iteritems():

990

ann_tag = document.createElement("annotation")

991

ann_tag.setAttribute("name", annotation)

992

ann_tag.setAttribute("value", value)

993

if_tag.appendChild(ann_tag)

994

735

# Add the names to the return values for the

995

736

# "org.freedesktop.DBus.Properties" methods

996

737

if (if_tag.getAttribute("name")

1011

752

except (AttributeError, xml.dom.DOMException,

1012

753

xml.parsers.expat.ExpatError) as error:

1013

754

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

1014

exc_info=error)

755

error)

1015

756

return xmlstring

1016

757

1017

758

1022

763

return dbus.String(dt.isoformat(),

1023

764

variant_level=variant_level)

1024

765

1025

1026

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1027

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

1028

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

1029

interface names according to the "alt_interface_names" mapping.

1030

Usage:

1031

1032

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

1033

"net.example.AlternateInterface"})

1034

class SampleDBusObject(dbus.service.Object):

1035

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

1036

def SampleDBusMethod():

1037

pass

1038

1039

The above "SampleDBusMethod" on "SampleDBusObject" will be

1040

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

1041

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

1042

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

1043

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

1044

1045

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

1046

(from DBusObjectWithProperties) and interfaces (from the

1047

dbus_interface_annotations decorator).

766

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

767

.__metaclass__):

768

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

769

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

1048

770

"""

1049

def wrapper(cls):

1050

for orig_interface_name, alt_interface_name in (

1051

alt_interface_names.iteritems()):

1052

attr = {}

1053

interface_names = set()

1054

# Go though all attributes of the class

1055

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

771

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

772

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

773

# methods, signals, or properties in them

774

for base in (b for b in bases

775

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

776

# Go though all attributes of the base class

777

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

1056

778

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

1057

779

# with the wrong interface name

1058

780

if (not hasattr(attribute, "_dbus_interface")

1059

781

or not attribute._dbus_interface

1060

.startswith(orig_interface_name)):

782

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

1061

783

continue

1062

784

# Create an alternate D-Bus interface name based on

1063

785

# the current name

1064

786

alt_interface = (attribute._dbus_interface

1065

.replace(orig_interface_name,

1066

alt_interface_name))

1067

interface_names.add(alt_interface)

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1068

789

# Is this a D-Bus signal?

1069

790

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

1070

791

# Extract the original non-method function by

1085

806

nonmethod_func.func_name,

1086

807

nonmethod_func.func_defaults,

1087

808

nonmethod_func.func_closure)))

1088

# Copy annotations, if any

1089

try:

1090

new_function._dbus_annotations = (

1091

dict(attribute._dbus_annotations))

1092

except AttributeError:

1093

pass

1094

809

# Define a creator of a function to call both the

1095

# original and alternate functions, so both the

1096

# original and alternate signals gets sent when

1097

# the function is called

810

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

811

# signals gets sent when the function is called

1098

812

def fixscope(func1, func2):

1099

813

"""This function is a scope container to pass

1100

814

func1 and func2 to the "call_both" function

1107

821

return call_both

1108

822

# Create the "call_both" function and add it to

1109

823

# the class

1110

attr[attrname] = fixscope(attribute, new_function)

824

attr[attrname] = fixscope(attribute,

825

new_function)

1111

826

# Is this a D-Bus method?

1112

827

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

1113

828

# Create a new, but exactly alike, function

1124

839

attribute.func_name,

1125

840

attribute.func_defaults,

1126

841

attribute.func_closure)))

1127

# Copy annotations, if any

1128

try:

1129

attr[attrname]._dbus_annotations = (

1130

dict(attribute._dbus_annotations))

1131

except AttributeError:

1132

pass

1133

842

# Is this a D-Bus property?

1134

843

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

1135

844

# Create a new, but exactly alike, function

1149

858

attribute.func_name,

1150

859

attribute.func_defaults,

1151

860

attribute.func_closure)))

1152

# Copy annotations, if any

1153

try:

1154

attr[attrname]._dbus_annotations = (

1155

dict(attribute._dbus_annotations))

1156

except AttributeError:

1157

pass

1158

# Is this a D-Bus interface?

1159

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

1160

# Create a new, but exactly alike, function

1161

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

1162

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

1163

# to the class.

1164

attr[attrname] = (dbus_interface_annotations

1165

(alt_interface)

1166

(types.FunctionType

1167

(attribute.func_code,

1168

attribute.func_globals,

1169

attribute.func_name,

1170

attribute.func_defaults,

1171

attribute.func_closure)))

1172

if deprecate:

1173

# Deprecate all alternate interfaces

1174

iname="_AlternateDBusNames_interface_annotation{0}"

1175

for interface_name in interface_names:

1176

@dbus_interface_annotations(interface_name)

1177

def func(self):

1178

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

1179

"true" }

1180

# Find an unused name

1181

for aname in (iname.format(i)

1182

for i in itertools.count()):

1183

if aname not in attr:

1184

attr[aname] = func

1185

break

1186

if interface_names:

1187

# Replace the class with a new subclass of it with

1188

# methods, signals, etc. as created above.

1189

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

1190

(cls,), attr)

1191

return cls

1192

return wrapper

1193

1194

1195

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

1196

"se.bsnet.fukt.Mandos"})

861

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

862

1197

863

class ClientDBus(Client, DBusObjectWithProperties):

1198

864

"""A Client class using D-Bus

1199

865

1208

874

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

1209

875

1210

876

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

877

self._approvals_pending = 0

1211

878

self.bus = bus

1212

879

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

1213

880

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

1219

886

("/clients/" + client_object_name))

1220

887

DBusObjectWithProperties.__init__(self, self.bus,

1221

888

self.dbus_object_path)

1222

889

1223

890

def notifychangeproperty(transform_func,

1224

891

dbus_name, type_func=lambda x: x,

1225

892

variant_level=1):

1226

893

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

1227

894

its changes to DBus.

1228

895

1229

896

transform_fun: Function that takes a value and a variant_level

1230

897

and transforms it to a D-Bus type.

1231

898

dbus_name: D-Bus name of the variable

1248

915

1249

916

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

1250

917

918

1251

919

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1252

920

approvals_pending = notifychangeproperty(dbus.Boolean,

1253

921

"ApprovalPending",

1260

928

checker is not None)

1261

929

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1262

930

"LastCheckedOK")

1263

last_checker_status = notifychangeproperty(dbus.Int16,

1264

"LastCheckerStatus")

1265

931

last_approval_request = notifychangeproperty(

1266

932

datetime_to_dbus, "LastApprovalRequest")

1267

933

approved_by_default = notifychangeproperty(dbus.Boolean,

1268

934

"ApprovedByDefault")

1269

approval_delay = notifychangeproperty(dbus.UInt64,

935

approval_delay = notifychangeproperty(dbus.UInt16,

1270

936

"ApprovalDelay",

1271

937

type_func =

1272

timedelta_to_milliseconds)

938

_timedelta_to_milliseconds)

1273

939

approval_duration = notifychangeproperty(

1274

dbus.UInt64, "ApprovalDuration",

1275

type_func = timedelta_to_milliseconds)

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1276

942

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

1277

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

943

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

1278

944

type_func =

1279

timedelta_to_milliseconds)

945

_timedelta_to_milliseconds)

1280

946

extended_timeout = notifychangeproperty(

1281

dbus.UInt64, "ExtendedTimeout",

1282

type_func = timedelta_to_milliseconds)

1283

interval = notifychangeproperty(dbus.UInt64,

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1284

950

"Interval",

1285

951

type_func =

1286

timedelta_to_milliseconds)

952

_timedelta_to_milliseconds)

1287

953

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

1288

954

1289

955

del notifychangeproperty

1331

997

return r

1332

998

1333

999

def _reset_approved(self):

1334

self.approved = None

1000

self._approved = None

1335

1001

return False

1336

1002

1337

1003

def approve(self, value=True):

1338

1004

self.send_changedstate()

1339

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1341

1007

(self.approval_duration),

1342

1008

self._reset_approved)

1343

1009

1010

1344

1011

## D-Bus methods, signals & properties

1345

1012

_interface = "se.recompile.Mandos.Client"

1346

1013

1347

## Interfaces

1348

1349

@dbus_interface_annotations(_interface)

1350

def _foo(self):

1351

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

1352

"false"}

1353

1354

1014

## Signals

1355

1015

1356

1016

# CheckerCompleted - signal

1455

1115

access="readwrite")

1456

1116

def ApprovalDuration_dbus_property(self, value=None):

1457

1117

if value is None: # get

1458

return dbus.UInt64(timedelta_to_milliseconds(

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1459

1119

self.approval_duration))

1460

1120

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

1461

1121

1475

1135

def Host_dbus_property(self, value=None):

1476

1136

if value is None: # get

1477

1137

return dbus.String(self.host)

1478

self.host = unicode(value)

1138

self.host = value

1479

1139

1480

1140

# Created - property

1481

1141

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

1482

1142

def Created_dbus_property(self):

1483

return datetime_to_dbus(self.created)

1143

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

1484

1144

1485

1145

# LastEnabled - property

1486

1146

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

1507

1167

return

1508

1168

return datetime_to_dbus(self.last_checked_ok)

1509

1169

1510

# LastCheckerStatus - property

1511

@dbus_service_property(_interface, signature="n",

1512

access="read")

1513

def LastCheckerStatus_dbus_property(self):

1514

return dbus.Int16(self.last_checker_status)

1515

1516

1170

# Expires - property

1517

1171

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

1518

1172

def Expires_dbus_property(self):

1530

1184

if value is None: # get

1531

1185

return dbus.UInt64(self.timeout_milliseconds())

1532

1186

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

1187

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

1188

return

1533

1189

# Reschedule timeout

1534

if self.enabled:

1535

now = datetime.datetime.utcnow()

1536

time_to_die = timedelta_to_milliseconds(

1537

(self.last_checked_ok + self.timeout) - now)

1538

if time_to_die <= 0:

1539

# The timeout has passed

1540

self.disable()

1541

else:

1542

self.expires = (now +

1543

datetime.timedelta(milliseconds =

1544

time_to_die))

1545

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

1546

is None):

1547

return

1548

gobject.source_remove(self.disable_initiator_tag)

1549

self.disable_initiator_tag = (gobject.timeout_add

1550

(time_to_die,

1551

self.disable))

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))

1552

1207

1553

1208

# ExtendedTimeout - property

1554

1209

@dbus_service_property(_interface, signature="t",

1567

1222

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

1568

1223

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

1569

1224

return

1570

if self.enabled:

1571

# Reschedule checker run

1572

gobject.source_remove(self.checker_initiator_tag)

1573

self.checker_initiator_tag = (gobject.timeout_add

1574

(value, self.start_checker))

1575

self.start_checker() # Start one now, too

1225

# Reschedule checker run

1226

gobject.source_remove(self.checker_initiator_tag)

1227

self.checker_initiator_tag = (gobject.timeout_add

1228

(value, self.start_checker))

1229

self.start_checker() # Start one now, too

1576

1230

1577

1231

# Checker - property

1578

1232

@dbus_service_property(_interface, signature="s",

1580

1234

def Checker_dbus_property(self, value=None):

1581

1235

if value is None: # get

1582

1236

return dbus.String(self.checker_command)

1583

self.checker_command = unicode(value)

1237

self.checker_command = value

1584

1238

1585

1239

# CheckerRunning - property

1586

1240

@dbus_service_property(_interface, signature="b",

1615

1269

raise KeyError()

1616

1270

1617

1271

def __getattribute__(self, name):

1618

if name == '_pipe':

1272

if(name == '_pipe'):

1619

1273

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

1620

1274

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

1621

1275

data = self._pipe.recv()

1628

1282

return func

1629

1283

1630

1284

def __setattr__(self, name, value):

1631

if name == '_pipe':

1285

if(name == '_pipe'):

1632

1286

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

1633

1287

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

1634

1288

1289

class ClientDBusTransitional(ClientDBus):

1290

__metaclass__ = AlternateDBusNamesMetaclass

1635

1291

1636

1292

class ClientHandler(socketserver.BaseRequestHandler, object):

1637

1293

"""A class to handle client connections.

1720

1376

client.Rejected("Disabled")

1721

1377

return

1722

1378

1723

if client.approved or not client.approval_delay:

1379

if client._approved or not client.approval_delay:

1724

1380

#We are approved or approval is disabled

1725

1381

break

1726

elif client.approved is None:

1382

elif client._approved is None:

1727

1383

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

1728

1384

client.name)

1729

1385

if self.server.use_dbus:

1743

1399

time = datetime.datetime.now()

1744

1400

client.changedstate.acquire()

1745

1401

(client.changedstate.wait

1746

(float(client.timedelta_to_milliseconds(delay)

1402

(float(client._timedelta_to_milliseconds(delay)

1747

1403

/ 1000)))

1748

1404

client.changedstate.release()

1749

1405

time2 = datetime.datetime.now()

1766

1422

try:

1767

1423

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

1768

1424

except gnutls.errors.GNUTLSError as error:

1769

logger.warning("gnutls send failed",

1770

exc_info=error)

1425

logger.warning("gnutls send failed")

1771

1426

return

1772

1427

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

1773

1428

sent, len(client.secret)

1776

1431

1777

1432

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

1778

1433

# bump the timeout using extended_timeout

1779

client.bump_timeout(client.extended_timeout)

1434

client.checked_ok(client.extended_timeout)

1780

1435

if self.server.use_dbus:

1781

1436

# Emit D-Bus signal

1782

1437

client.GotSecret()

1787

1442

try:

1788

1443

session.bye()

1789

1444

except gnutls.errors.GNUTLSError as error:

1790

logger.warning("GnuTLS bye failed",

1791

exc_info=error)

1445

logger.warning("GnuTLS bye failed")

1792

1446

1793

1447

@staticmethod

1794

1448

def peer_certificate(session):

1850

1504

# Convert the buffer to a Python bytestring

1851

1505

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

1852

1506

# Convert the bytestring to hexadecimal notation

1853

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

1507

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

1854

1508

return hex_fpr

1855

1509

1856

1510

1859

1513

def sub_process_main(self, request, address):

1860

1514

try:

1861

1515

self.finish_request(request, address)

1862

except Exception:

1516

except:

1863

1517

self.handle_error(request, address)

1864

1518

self.close_request(request)

1865

1519

1866

1520

def process_request(self, request, address):

1867

1521

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

1868

1522

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

1869

args = (request, address))

1523

args = (request,

1524

address))

1870

1525

proc.start()

1871

1526

return proc

1872

1527

1969

1624

self.enabled = False

1970

1625

self.clients = clients

1971

1626

if self.clients is None:

1972

self.clients = {}

1627

self.clients = set()

1973

1628

self.use_dbus = use_dbus

1974

1629

self.gnutls_priority = gnutls_priority

1975

1630

IPv6_TCPServer.__init__(self, server_address,

1994

1649

1995

1650

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

1996

1651

proc = None, client_object=None):

1652

condition_names = {

1653

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

1654

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

1655

# blocking).

1656

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

1657

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

1658

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

1659

# broken, usually for pipes and

1660

# sockets).

1661

}

1662

conditions_string = ' | '.join(name

1663

for cond, name in

1664

condition_names.iteritems()

1665

if cond & condition)

1997

1666

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

1998

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

1667

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

1999

1668

# Wait for other process to exit

2000

1669

proc.join()

2001

1670

return False

2008

1677

fpr = request[1]

2009

1678

address = request[2]

2010

1679

2011

for c in self.clients.itervalues():

1680

for c in self.clients:

2012

1681

if c.fingerprint == fpr:

2013

1682

client = c

2014

1683

break

2091

1760

elif suffix == "w":

2092

1761

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

2093

1762

else:

2094

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

2095

.format(suffix))

1763

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

2096

1764

except (ValueError, IndexError) as e:

2097

1765

raise ValueError(*(e.args))

2098

1766

timevalue += delta

2099

1767

return timevalue

2100

1768

2101

1769

1770

def if_nametoindex(interface):

1771

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

1772

1773

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

1774

global if_nametoindex

1775

try:

1776

if_nametoindex = (ctypes.cdll.LoadLibrary

1777

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

1778

.if_nametoindex)

1779

except (OSError, AttributeError):

1780

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

1781

def if_nametoindex(interface):

1782

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

1783

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

1784

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

1785

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1786

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

1787

interface))

1788

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

1789

ifreq[16:20])[0]

1790

return interface_index

1791

return if_nametoindex(interface)

1792

1793

2102

1794

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

2103

1795

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

2104

1796

2112

1804

sys.exit()

2113

1805

if not noclose:

2114

1806

# Close all standard open file descriptors

2115

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

1807

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

2116

1808

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

2117

1809

raise OSError(errno.ENODEV,

2118

"{0} not a character device"

2119

.format(os.devnull))

1810

"%s not a character device"

1811

% os.path.devnull)

2120

1812

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

2121

1813

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

2122

1814

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

2131

1823

2132

1824

parser = argparse.ArgumentParser()

2133

1825

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

2134

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

1826

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

2135

1827

help="show version number and exit")

2136

1828

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

2137

1829

help="Bind to interface IF")

2159

1851

" system bus interface")

2160

1852

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

2161

1853

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

2162

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

2163

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

2164

" state")

2165

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

2166

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

2167

2168

1854

options = parser.parse_args()

2169

1855

2170

1856

if options.check:

2183

1869

"use_dbus": "True",

2184

1870

"use_ipv6": "True",

2185

1871

"debuglevel": "",

2186

"restore": "True",

2187

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

2188

1872

}

2189

1873

2190

1874

# Parse config file for server-global settings

2207

1891

# options, if set.

2208

1892

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

2209

1893

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

2210

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

2211

"statedir"):

1894

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

2212

1895

value = getattr(options, option)

2213

1896

if value is not None:

2214

1897

server_settings[option] = value

2226

1909

debuglevel = server_settings["debuglevel"]

2227

1910

use_dbus = server_settings["use_dbus"]

2228

1911

use_ipv6 = server_settings["use_ipv6"]

2229

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

2230

stored_state_file)

2231

2232

if debug:

2233

initlogger(debug, logging.DEBUG)

2234

else:

2235

if not debuglevel:

2236

initlogger(debug)

2237

else:

2238

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

2239

initlogger(debug, level)

2240

1912

2241

1913

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

2242

1914

syslogger.setFormatter(logging.Formatter

2243

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

2244

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

2245

.format(server_settings

2246

["servicename"])))

1915

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

1916

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

1917

% server_settings["servicename"]))

2247

1918

2248

1919

# Parse config file with clients

2249

client_config = configparser.SafeConfigParser(Client

2250

.client_defaults)

1920

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

1921

"extended_timeout": "15m",

1922

"interval": "2m",

1923

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

1924

"host": "",

1925

"approval_delay": "0s",

1926

"approval_duration": "1s",

1927

}

1928

client_config = configparser.SafeConfigParser(client_defaults)

2251

1929

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

2252

1930

"clients.conf"))

2253

1931

2267

1945

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

2268

1946

try:

2269

1947

pidfile = open(pidfilename, "w")

2270

except IOError as e:

2271

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

2272

exc_info=e)

1948

except IOError:

1949

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

2273

1950

2274

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

1951

try:

1952

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

1953

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

1954

except KeyError:

2275

1955

try:

2276

uid = pwd.getpwnam(name).pw_uid

2277

gid = pwd.getpwnam(name).pw_gid

2278

break

1956

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

1957

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

2279

1958

except KeyError:

2280

continue

2281

else:

2282

uid = 65534

2283

gid = 65534

1959

try:

1960

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

1961

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

1962

except KeyError:

1963

uid = 65534

1964

gid = 65534

2284

1965

try:

2285

1966

os.setgid(gid)

2286

1967

os.setuid(uid)

2288

1969

if error[0] != errno.EPERM:

2289

1970

raise error

2290

1971

1972

if not debug and not debuglevel:

1973

syslogger.setLevel(logging.WARNING)

1974

console.setLevel(logging.WARNING)

1975

if debuglevel:

1976

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

1977

syslogger.setLevel(level)

1978

console.setLevel(level)

1979

2291

1980

if debug:

2292

1981

# Enable all possible GnuTLS debugging

2293

1982

2303

1992

.gnutls_global_set_log_function(debug_gnutls))

2304

1993

2305

1994

# Redirect stdin so all checkers get /dev/null

2306

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

1995

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

2307

1996

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

2308

1997

if null > 2:

2309

1998

os.close(null)

1999

else:

2000

# No console logging

2001

logger.removeHandler(console)

2310

2002

2311

2003

# Need to fork before connecting to D-Bus

2312

2004

if not debug:

2313

2005

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

2314

2006

daemon()

2315

2007

2316

gobject.threads_init()

2317

2318

2008

global main_loop

2319

2009

# From the Avahi example code

2320

DBusGMainLoop(set_as_default=True)

2010

DBusGMainLoop(set_as_default=True )

2321

2011

main_loop = gobject.MainLoop()

2322

2012

bus = dbus.SystemBus()

2323

2013

# End of Avahi example code

2329

2019

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

2330

2020

do_not_queue=True))

2331

2021

except dbus.exceptions.NameExistsException as e:

2332

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

2022

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

2333

2023

use_dbus = False

2334

2024

server_settings["use_dbus"] = False

2335

2025

tcp_server.use_dbus = False

2336

2026

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2337

service = AvahiServiceToSyslog(name =

2338

server_settings["servicename"],

2339

servicetype = "_mandos._tcp",

2340

protocol = protocol, bus = bus)

2027

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

2028

servicetype = "_mandos._tcp",

2029

protocol = protocol, bus = bus)

2341

2030

if server_settings["interface"]:

2342

2031

service.interface = (if_nametoindex

2343

2032

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

2347

2036

2348

2037

client_class = Client

2349

2038

if use_dbus:

2350

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

2351

2352

client_settings = Client.config_parser(client_config)

2353

old_client_settings = {}

2354

clients_data = {}

2355

2356

# Get client data and settings from last running state.

2357

if server_settings["restore"]:

2358

try:

2359

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

2360

clients_data, old_client_settings = (pickle.load

2361

(stored_state))

2362

os.remove(stored_state_path)

2363

except IOError as e:

2364

if e.errno == errno.ENOENT:

2365

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

2366

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

2367

else:

2368

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

2369

exc_info=e)

2370

raise

2371

except EOFError as e:

2372

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

2373

"EOFError:", exc_info=e)

2374

2375

with PGPEngine() as pgp:

2376

for client_name, client in clients_data.iteritems():

2377

# Decide which value to use after restoring saved state.

2378

# We have three different values: Old config file,

2379

# new config file, and saved state.

2380

# New config value takes precedence if it differs from old

2381

# config value, otherwise use saved state.

2382

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

2383

try:

2384

# For each value in new config, check if it

2385

# differs from the old config value (Except for

2386

# the "secret" attribute)

2387

if (name != "secret" and

2388

value != old_client_settings[client_name]

2389

[name]):

2390

client[name] = value

2391

except KeyError:

2392

pass

2393

2394

# Clients who has passed its expire date can still be

2395

# enabled if its last checker was successful. Clients

2396

# whose checker succeeded before we stored its state is

2397

# assumed to have successfully run all checkers during

2398

# downtime.

2399

if client["enabled"]:

2400

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

2401

if not client["last_checked_ok"]:

2402

logger.warning(

2403

"disabling client {0} - Client never "

2404

"performed a successful checker"

2405

.format(client_name))

2406

client["enabled"] = False

2407

elif client["last_checker_status"] != 0:

2408

logger.warning(

2409

"disabling client {0} - Client "

2410

"last checker failed with error code {1}"

2411

.format(client_name,

2412

client["last_checker_status"]))

2413

client["enabled"] = False

2414

else:

2415

client["expires"] = (datetime.datetime

2416

.utcnow()

2417

+ client["timeout"])

2418

logger.debug("Last checker succeeded,"

2419

" keeping {0} enabled"

2420

.format(client_name))

2039

client_class = functools.partial(ClientDBusTransitional,

2040

bus = bus)

2041

def client_config_items(config, section):

2042

special_settings = {

2043

"approved_by_default":

2044

lambda: config.getboolean(section,

2045

"approved_by_default"),

2046

}

2047

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

2421

2048

try:

2422

client["secret"] = (

2423

pgp.decrypt(client["encrypted_secret"],

2424

client_settings[client_name]

2425

["secret"]))

2426

except PGPError:

2427

# If decryption fails, we use secret from new settings

2428

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

2429

.format(client_name))

2430

client["secret"] = (

2431

client_settings[client_name]["secret"])

2432

2433

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

2434

for client_name in (set(old_client_settings)

2435

- set(client_settings)):

2436

del clients_data[client_name]

2437

for client_name in (set(client_settings)

2438

- set(old_client_settings)):

2439

clients_data[client_name] = client_settings[client_name]

2440

2441

# Create all client objects

2442

for client_name, client in clients_data.iteritems():

2443

tcp_server.clients[client_name] = client_class(

2444

name = client_name, settings = client)

2445

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()))

2446

2058

if not tcp_server.clients:

2447

2059

logger.warning("No clients defined")

2448

2060

2449

2061

if not debug:

2450

2062

try:

2451

2063

with pidfile:

2459

2071

# "pidfile" was never created

2460

2072

pass

2461

2073

del pidfilename

2074

2462

2075

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

2463

2076

2464

2077

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

2465

2078

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

2466

2079

2467

2080

if use_dbus:

2468

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

2469

"se.bsnet.fukt.Mandos"})

2470

class MandosDBusService(DBusObjectWithProperties):

2081

class MandosDBusService(dbus.service.Object):

2471

2082

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

2472

2083

def __init__(self):

2473

2084

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

2474

2085

_interface = "se.recompile.Mandos"

2475

2086

2476

@dbus_interface_annotations(_interface)

2477

def _foo(self):

2478

return { "org.freedesktop.DBus.Property"

2479

".EmitsChangedSignal":

2480

"false"}

2481

2482

2087

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

2483

2088

def ClientAdded(self, objpath):

2484

2089

"D-Bus signal"

2498

2103

def GetAllClients(self):

2499

2104

"D-Bus method"

2500

2105

return dbus.Array(c.dbus_object_path

2501

for c in

2502

tcp_server.clients.itervalues())

2106

for c in tcp_server.clients)

2503

2107

2504

2108

@dbus.service.method(_interface,

2505

2109

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

2507

2111

"D-Bus method"

2508

2112

return dbus.Dictionary(

2509

2113

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

2510

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

2114

for c in tcp_server.clients),

2511

2115

signature="oa{sv}")

2512

2116

2513

2117

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

2514

2118

def RemoveClient(self, object_path):

2515

2119

"D-Bus method"

2516

for c in tcp_server.clients.itervalues():

2120

for c in tcp_server.clients:

2517

2121

if c.dbus_object_path == object_path:

2518

del tcp_server.clients[c.name]

2122

tcp_server.clients.remove(c)

2519

2123

c.remove_from_connection()

2520

2124

# Don't signal anything except ClientRemoved

2521

2125

c.disable(quiet=True)

2526

2130

2527

2131

del _interface

2528

2132

2529

mandos_dbus_service = MandosDBusService()

2133

class MandosDBusServiceTransitional(MandosDBusService):

2134

__metaclass__ = AlternateDBusNamesMetaclass

2135

mandos_dbus_service = MandosDBusServiceTransitional()

2530

2136

2531

2137

def cleanup():

2532

2138

"Cleanup function; run on exit"

2533

2139

service.cleanup()

2534

2140

2535

2141

multiprocessing.active_children()

2536

if not (tcp_server.clients or client_settings):

2537

return

2538

2539

# Store client before exiting. Secrets are encrypted with key

2540

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

2541

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

2542

clients = {}

2543

with PGPEngine() as pgp:

2544

for client in tcp_server.clients.itervalues():

2545

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

2546

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

2547

key)

2548

client_dict = {}

2549

2550

# A list of attributes that can not be pickled

2551

# + secret.

2552

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

2553

"checker"))

2554

for name, typ in (inspect.getmembers

2555

(dbus.service.Object)):

2556

exclude.add(name)

2557

2558

client_dict["encrypted_secret"] = (client

2559

.encrypted_secret)

2560

for attr in client.client_structure:

2561

if attr not in exclude:

2562

client_dict[attr] = getattr(client, attr)

2563

2564

clients[client.name] = client_dict

2565

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

2566

2567

try:

2568

with (tempfile.NamedTemporaryFile

2569

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

2570

dir=os.path.dirname(stored_state_path),

2571

delete=False)) as stored_state:

2572

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

2573

tempname=stored_state.name

2574

os.rename(tempname, stored_state_path)

2575

except (IOError, OSError) as e:

2576

if not debug:

2577

try:

2578

os.remove(tempname)

2579

except NameError:

2580

pass

2581

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

2582

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

2583

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

2584

else:

2585

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

2586

exc_info=e)

2587

raise e

2588

2589

# Delete all clients, and settings from config

2590

2142

while tcp_server.clients:

2591

name, client = tcp_server.clients.popitem()

2143

client = tcp_server.clients.pop()

2592

2144

if use_dbus:

2593

2145

client.remove_from_connection()

2146

client.disable_hook = None

2594

2147

# Don't signal anything except ClientRemoved

2595

2148

client.disable(quiet=True)

2596

2149

if use_dbus:

2598

2151

mandos_dbus_service.ClientRemoved(client

2599

2152

.dbus_object_path,

2600

2153

client.name)

2601

client_settings.clear()

2602

2154

2603

2155

atexit.register(cleanup)

2604

2156

2605

for client in tcp_server.clients.itervalues():

2157

for client in tcp_server.clients:

2606

2158

if use_dbus:

2607

2159

# Emit D-Bus signal

2608

2160

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2609

# Need to initiate checking of clients

2610

if client.enabled:

2611

client.init_checker()

2161

client.enable()

2612

2162

2613

2163

tcp_server.enable()

2614

2164

tcp_server.server_activate()

2617

2167

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

2618

2168

if use_ipv6:

2619

2169

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

2620

" flowinfo %d, scope_id %d",

2621

*tcp_server.socket.getsockname())

2170

" flowinfo %d, scope_id %d"

2171

% tcp_server.socket.getsockname())

2622

2172

else: # IPv4

2623

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

2624

*tcp_server.socket.getsockname())

2173

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

2174

% tcp_server.socket.getsockname())

2625

2175

2626

2176

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

2627

2177

2630

2180

try:

2631

2181

service.activate()

2632

2182

except dbus.exceptions.DBusException as error:

2633

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

2183

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

2634

2184

cleanup()

2635

2185

sys.exit(1)

2636

2186

# End of Avahi example code

2643

2193

logger.debug("Starting main loop")

2644

2194

main_loop.run()

2645

2195

except AvahiError as error:

2646

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

2196

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

2647

2197

cleanup()

2648

2198

sys.exit(1)

2649

2199

except KeyboardInterrupt:

2654

2204

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

2655

2205

cleanup()

2656

2206

2207

2657

2208

if __name__ == '__main__':

2658

2209

main()