/mandos/release : revision 237.7.127

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

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

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% self.name))

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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_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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"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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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.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

495

elif "secfile" in section:

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

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(section["secfile"])),

498

"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))

503

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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516

return settings

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

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519

self.name = name

345

if config is None:

346

config = {}

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

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347

534

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

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535

# Uppercase and remove spaces from fingerprint for later

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536

# comparison purposes with return value from the fingerprint()

350

537

# function

351

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

352

.replace(" ", ""))

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538

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

354

if "secret" in config:

355

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

356

elif "secfile" in config:

357

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

358

(config["secfile"])),

359

"rb") as secfile:

360

self.secret = secfile.read()

361

else:

362

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

363

% self.name)

364

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

365

self.created = datetime.datetime.utcnow()

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self.enabled = False

367

self.last_approval_request = None

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self.last_enabled = None

369

self.last_checked_ok = None

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

371

self.extended_timeout = string_to_delta(config

372

["extended_timeout"])

373

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

374

self.disable_hook = disable_hook

539

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

540

datetime.datetime.utcnow())

541

542

# attributes specific for this server instance

375

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self.checker = None

376

544

self.checker_initiator_tag = None

377

545

self.disable_initiator_tag = None

378

self.expires = None

379

546

self.checker_callback_tag = None

380

self.checker_command = config["checker"]

381

547

self.current_checker_command = None

382

self.last_connect = None

383

self._approved = None

384

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

385

True)

548

self.approved = None

386

549

self.approvals_pending = 0

387

self.approval_delay = string_to_delta(

388

config["approval_delay"])

389

self.approval_duration = string_to_delta(

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config["approval_duration"])

391

550

self.changedstate = (multiprocessing_manager

392

551

.Condition(multiprocessing_manager

393

552

.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)

394

564

565

# Send notice to process children that client state has changed

395

566

def send_changedstate(self):

396

self.changedstate.acquire()

397

self.changedstate.notify_all()

398

self.changedstate.release()

567

with self.changedstate:

568

self.changedstate.notify_all()

399

569

400

570

def enable(self):

401

571

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

403

573

# Already enabled

404

574

return

405

575

self.send_changedstate()

406

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

407

# and every interval from then on.

408

self.checker_initiator_tag = (gobject.timeout_add

409

(self.interval_milliseconds(),

410

self.start_checker))

411

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

412

576

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

413

self.disable_initiator_tag = (gobject.timeout_add

414

(self.timeout_milliseconds(),

415

self.disable))

416

577

self.enabled = True

417

578

self.last_enabled = datetime.datetime.utcnow()

418

# Also start a new checker *right now*.

419

self.start_checker()

579

self.init_checker()

420

580

421

581

def disable(self, quiet=True):

422

582

"""Disable this client."""

434

594

gobject.source_remove(self.checker_initiator_tag)

435

595

self.checker_initiator_tag = None

436

596

self.stop_checker()

437

if self.disable_hook:

438

self.disable_hook(self)

439

597

self.enabled = False

440

598

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

441

599

return False

442

600

443

601

def __del__(self):

444

self.disable_hook = None

445

602

self.disable()

446

603

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

447

617

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

448

618

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

449

619

self.checker_callback_tag = None

450

620

self.checker = None

451

621

if os.WIFEXITED(condition):

452

exitstatus = os.WEXITSTATUS(condition)

453

if exitstatus == 0:

622

self.last_checker_status = os.WEXITSTATUS(condition)

623

if self.last_checker_status == 0:

454

624

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

455

625

vars(self))

456

626

self.checked_ok()

458

628

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

459

629

vars(self))

460

630

else:

631

self.last_checker_status = -1

461

632

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

462

633

vars(self))

463

634

464

def checked_ok(self, timeout=None):

465

"""Bump up the timeout for this client.

466

467

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

468

alive and well.

469

"""

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."""

470

643

if timeout is None:

471

644

timeout = self.timeout

472

self.last_checked_ok = datetime.datetime.utcnow()

473

645

if self.disable_initiator_tag is not None:

474

646

gobject.source_remove(self.disable_initiator_tag)

475

647

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

476

648

self.disable_initiator_tag = (gobject.timeout_add

477

(_timedelta_to_milliseconds

649

(timedelta_to_milliseconds

478

650

(timeout), self.disable))

479

651

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

480

652

487

659

If a checker already exists, leave it running and do

488

660

nothing."""

489

661

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

490

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

491

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

492

# client would inevitably timeout, since no checker would get

493

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

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

494

666

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

495

667

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

496

668

# should be.

526

698

try:

527

699

command = self.checker_command % escaped_attrs

528

700

except TypeError as error:

529

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

530

' %s', self.checker_command, error)

701

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

702

self.checker_command, exc_info=error)

531

703

return True # Try again later

532

704

self.current_checker_command = command

533

705

try:

551

723

gobject.source_remove(self.checker_callback_tag)

552

724

self.checker_callback(pid, status, command)

553

725

except OSError as error:

554

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

555

error)

726

logger.error("Failed to start subprocess",

727

exc_info=error)

556

728

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

557

729

return True

558

730

565

737

return

566

738

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

567

739

try:

568

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

740

self.checker.terminate()

569

741

#time.sleep(0.5)

570

742

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

571

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

743

# self.checker.kill()

572

744

except OSError as error:

573

745

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

574

746

raise

591

763

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

592

764

if byte_arrays and signature != "ay":

593

765

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

594

" signature %r" % signature)

766

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

595

767

def decorator(func):

596

768

func._dbus_is_property = True

597

769

func._dbus_interface = dbus_interface

605

777

return decorator

606

778

607

779

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

608

817

class DBusPropertyException(dbus.exceptions.DBusException):

609

818

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

610

819

"""

633

842

"""

634

843

635

844

@staticmethod

636

def _is_dbus_property(obj):

637

return getattr(obj, "_dbus_is_property", False)

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)

638

853

639

def _get_all_dbus_properties(self):

854

def _get_all_dbus_things(self, thing):

640

855

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

641

856

"""

642

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

857

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

858

name),

859

athing.__get__(self))

643

860

for cls in self.__class__.__mro__

644

for name, prop in

645

inspect.getmembers(cls, self._is_dbus_property))

861

for name, athing in

862

inspect.getmembers(cls,

863

self._is_dbus_thing(thing)))

646

864

647

865

def _get_dbus_property(self, interface_name, property_name):

648

866

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

650

868

"""

651

869

for cls in self.__class__.__mro__:

652

870

for name, value in (inspect.getmembers

653

(cls, self._is_dbus_property)):

871

(cls,

872

self._is_dbus_thing("property"))):

654

873

if (value._dbus_name == property_name

655

874

and value._dbus_interface == interface_name):

656

875

return value.__get__(self)

685

904

# signatures other than "ay".

686

905

if prop._dbus_signature != "ay":

687

906

raise ValueError

688

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

689

for byte in value))

907

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

908

for byte in value))

690

909

prop(value)

691

910

692

911

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

697

916

698

917

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

699

918

"""

700

all = {}

701

for name, prop in self._get_all_dbus_properties():

919

properties = {}

920

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

702

921

if (interface_name

703

922

and interface_name != prop._dbus_interface):

704

923

# Interface non-empty but did not match

708

927

continue

709

928

value = prop()

710

929

if not hasattr(value, "variant_level"):

711

all[name] = value

930

properties[name] = value

712

931

continue

713

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

714

value.variant_level+1)

715

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

932

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

933

value.variant_level+1)

934

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

716

935

717

936

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

718

937

out_signature="s",

719

938

path_keyword='object_path',

720

939

connection_keyword='connection')

721

940

def Introspect(self, object_path, connection):

722

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

941

"""Overloading of standard D-Bus method.

942

943

Inserts property tags and interface annotation tags.

723

944

"""

724

945

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

725

946

connection)

732

953

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

733

954

return e

734

955

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

956

# Add property tags

735

957

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

736

958

for name, prop

737

in self._get_all_dbus_properties()

959

in self._get_all_dbus_things("property")

738

960

if prop._dbus_interface

739

961

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

740

962

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)

741

994

# Add the names to the return values for the

742

995

# "org.freedesktop.DBus.Properties" methods

743

996

if (if_tag.getAttribute("name")

758

1011

except (AttributeError, xml.dom.DOMException,

759

1012

xml.parsers.expat.ExpatError) as error:

760

1013

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

761

error)

1014

exc_info=error)

762

1015

return xmlstring

763

1016

764

1017

769

1022

return dbus.String(dt.isoformat(),

770

1023

variant_level=variant_level)

771

1024

772

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

773

.__metaclass__):

774

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

775

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

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).

776

1048

"""

777

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

778

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

779

# methods, signals, or properties in them

780

for base in (b for b in bases

781

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

782

# Go though all attributes of the base class

783

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

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):

784

1056

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

785

1057

# with the wrong interface name

786

1058

if (not hasattr(attribute, "_dbus_interface")

787

1059

or not attribute._dbus_interface

788

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

1060

.startswith(orig_interface_name)):

789

1061

continue

790

1062

# Create an alternate D-Bus interface name based on

791

1063

# the current name

792

1064

alt_interface = (attribute._dbus_interface

793

.replace("se.recompile.Mandos",

794

"se.bsnet.fukt.Mandos"))

1065

.replace(orig_interface_name,

1066

alt_interface_name))

1067

interface_names.add(alt_interface)

795

1068

# Is this a D-Bus signal?

796

1069

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

797

1070

# Extract the original non-method function by

812

1085

nonmethod_func.func_name,

813

1086

nonmethod_func.func_defaults,

814

1087

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

815

1094

# Define a creator of a function to call both the

816

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

817

# signals gets sent when the function is called

1095

# original and alternate functions, so both the

1096

# original and alternate signals gets sent when

1097

# the function is called

818

1098

def fixscope(func1, func2):

819

1099

"""This function is a scope container to pass

820

1100

func1 and func2 to the "call_both" function

827

1107

return call_both

828

1108

# Create the "call_both" function and add it to

829

1109

# the class

830

attr[attrname] = fixscope(attribute,

831

new_function)

1110

attr[attrname] = fixscope(attribute, new_function)

832

1111

# Is this a D-Bus method?

833

1112

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

834

1113

# Create a new, but exactly alike, function

845

1124

attribute.func_name,

846

1125

attribute.func_defaults,

847

1126

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

848

1133

# Is this a D-Bus property?

849

1134

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

850

1135

# Create a new, but exactly alike, function

864

1149

attribute.func_name,

865

1150

attribute.func_defaults,

866

1151

attribute.func_closure)))

867

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

868

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"})

869

1197

class ClientDBus(Client, DBusObjectWithProperties):

870

1198

"""A Client class using D-Bus

871

1199

880

1208

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

881

1209

882

1210

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

883

self._approvals_pending = 0

884

1211

self.bus = bus

885

1212

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

886

1213

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

892

1219

("/clients/" + client_object_name))

893

1220

DBusObjectWithProperties.__init__(self, self.bus,

894

1221

self.dbus_object_path)

895

1222

896

1223

def notifychangeproperty(transform_func,

897

1224

dbus_name, type_func=lambda x: x,

898

1225

variant_level=1):

899

1226

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

900

1227

its changes to DBus.

901

1228

902

1229

transform_fun: Function that takes a value and a variant_level

903

1230

and transforms it to a D-Bus type.

904

1231

dbus_name: D-Bus name of the variable

921

1248

922

1249

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

923

1250

924

925

1251

expires = notifychangeproperty(datetime_to_dbus, "Expires")

926

1252

approvals_pending = notifychangeproperty(dbus.Boolean,

927

1253

"ApprovalPending",

934

1260

checker is not None)

935

1261

last_checked_ok = notifychangeproperty(datetime_to_dbus,

936

1262

"LastCheckedOK")

1263

last_checker_status = notifychangeproperty(dbus.Int16,

1264

"LastCheckerStatus")

937

1265

last_approval_request = notifychangeproperty(

938

1266

datetime_to_dbus, "LastApprovalRequest")

939

1267

approved_by_default = notifychangeproperty(dbus.Boolean,

940

1268

"ApprovedByDefault")

941

approval_delay = notifychangeproperty(dbus.UInt16,

1269

approval_delay = notifychangeproperty(dbus.UInt64,

942

1270

"ApprovalDelay",

943

1271

type_func =

944

_timedelta_to_milliseconds)

1272

timedelta_to_milliseconds)

945

1273

approval_duration = notifychangeproperty(

946

dbus.UInt16, "ApprovalDuration",

947

type_func = _timedelta_to_milliseconds)

1274

dbus.UInt64, "ApprovalDuration",

1275

type_func = timedelta_to_milliseconds)

948

1276

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

949

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

1277

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

950

1278

type_func =

951

_timedelta_to_milliseconds)

1279

timedelta_to_milliseconds)

952

1280

extended_timeout = notifychangeproperty(

953

dbus.UInt16, "ExtendedTimeout",

954

type_func = _timedelta_to_milliseconds)

955

interval = notifychangeproperty(dbus.UInt16,

1281

dbus.UInt64, "ExtendedTimeout",

1282

type_func = timedelta_to_milliseconds)

1283

interval = notifychangeproperty(dbus.UInt64,

956

1284

"Interval",

957

1285

type_func =

958

_timedelta_to_milliseconds)

1286

timedelta_to_milliseconds)

959

1287

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

960

1288

961

1289

del notifychangeproperty

1003

1331

return r

1004

1332

1005

1333

def _reset_approved(self):

1006

self._approved = None

1334

self.approved = None

1007

1335

return False

1008

1336

1009

1337

def approve(self, value=True):

1010

1338

self.send_changedstate()

1011

self._approved = value

1012

gobject.timeout_add(_timedelta_to_milliseconds

1339

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

1013

1341

(self.approval_duration),

1014

1342

self._reset_approved)

1015

1343

1016

1017

1344

## D-Bus methods, signals & properties

1018

1345

_interface = "se.recompile.Mandos.Client"

1019

1346

1347

## Interfaces

1348

1349

@dbus_interface_annotations(_interface)

1350

def _foo(self):

1351

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

1352

"false"}

1353

1020

1354

## Signals

1021

1355

1022

1356

# CheckerCompleted - signal

1121

1455

access="readwrite")

1122

1456

def ApprovalDuration_dbus_property(self, value=None):

1123

1457

if value is None: # get

1124

return dbus.UInt64(_timedelta_to_milliseconds(

1458

return dbus.UInt64(timedelta_to_milliseconds(

1125

1459

self.approval_duration))

1126

1460

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

1127

1461

1141

1475

def Host_dbus_property(self, value=None):

1142

1476

if value is None: # get

1143

1477

return dbus.String(self.host)

1144

self.host = value

1478

self.host = unicode(value)

1145

1479

1146

1480

# Created - property

1147

1481

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

1148

1482

def Created_dbus_property(self):

1149

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

1483

return datetime_to_dbus(self.created)

1150

1484

1151

1485

# LastEnabled - property

1152

1486

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

1173

1507

return

1174

1508

return datetime_to_dbus(self.last_checked_ok)

1175

1509

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

1176

1516

# Expires - property

1177

1517

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

1178

1518

def Expires_dbus_property(self):

1190

1530

if value is None: # get

1191

1531

return dbus.UInt64(self.timeout_milliseconds())

1192

1532

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

1193

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

1194

return

1195

1533

# Reschedule timeout

1196

gobject.source_remove(self.disable_initiator_tag)

1197

self.disable_initiator_tag = None

1198

self.expires = None

1199

time_to_die = _timedelta_to_milliseconds((self

1200

.last_checked_ok

1201

+ self.timeout)

1202

- datetime.datetime

1203

.utcnow())

1204

if time_to_die <= 0:

1205

# The timeout has passed

1206

self.disable()

1207

else:

1208

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

1209

+ datetime.timedelta(milliseconds =

1210

time_to_die))

1211

self.disable_initiator_tag = (gobject.timeout_add

1212

(time_to_die, self.disable))

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))

1213

1552

1214

1553

# ExtendedTimeout - property

1215

1554

@dbus_service_property(_interface, signature="t",

1228

1567

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

1229

1568

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

1230

1569

return

1231

# Reschedule checker run

1232

gobject.source_remove(self.checker_initiator_tag)

1233

self.checker_initiator_tag = (gobject.timeout_add

1234

(value, self.start_checker))

1235

self.start_checker() # Start one now, too

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

1236

1576

1237

1577

# Checker - property

1238

1578

@dbus_service_property(_interface, signature="s",

1240

1580

def Checker_dbus_property(self, value=None):

1241

1581

if value is None: # get

1242

1582

return dbus.String(self.checker_command)

1243

self.checker_command = value

1583

self.checker_command = unicode(value)

1244

1584

1245

1585

# CheckerRunning - property

1246

1586

@dbus_service_property(_interface, signature="b",

1275

1615

raise KeyError()

1276

1616

1277

1617

def __getattribute__(self, name):

1278

if(name == '_pipe'):

1618

if name == '_pipe':

1279

1619

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

1280

1620

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

1281

1621

data = self._pipe.recv()

1288

1628

return func

1289

1629

1290

1630

def __setattr__(self, name, value):

1291

if(name == '_pipe'):

1631

if name == '_pipe':

1292

1632

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

1293

1633

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

1294

1634

1295

class ClientDBusTransitional(ClientDBus):

1296

__metaclass__ = AlternateDBusNamesMetaclass

1297

1635

1298

1636

class ClientHandler(socketserver.BaseRequestHandler, object):

1299

1637

"""A class to handle client connections.

1382

1720

client.Rejected("Disabled")

1383

1721

return

1384

1722

1385

if client._approved or not client.approval_delay:

1723

if client.approved or not client.approval_delay:

1386

1724

#We are approved or approval is disabled

1387

1725

break

1388

elif client._approved is None:

1726

elif client.approved is None:

1389

1727

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

1390

1728

client.name)

1391

1729

if self.server.use_dbus:

1405

1743

time = datetime.datetime.now()

1406

1744

client.changedstate.acquire()

1407

1745

(client.changedstate.wait

1408

(float(client._timedelta_to_milliseconds(delay)

1746

(float(client.timedelta_to_milliseconds(delay)

1409

1747

/ 1000)))

1410

1748

client.changedstate.release()

1411

1749

time2 = datetime.datetime.now()

1428

1766

try:

1429

1767

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

1430

1768

except gnutls.errors.GNUTLSError as error:

1431

logger.warning("gnutls send failed")

1769

logger.warning("gnutls send failed",

1770

exc_info=error)

1432

1771

return

1433

1772

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

1434

1773

sent, len(client.secret)

1437

1776

1438

1777

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

1439

1778

# bump the timeout using extended_timeout

1440

client.checked_ok(client.extended_timeout)

1779

client.bump_timeout(client.extended_timeout)

1441

1780

if self.server.use_dbus:

1442

1781

# Emit D-Bus signal

1443

1782

client.GotSecret()

1448

1787

try:

1449

1788

session.bye()

1450

1789

except gnutls.errors.GNUTLSError as error:

1451

logger.warning("GnuTLS bye failed")

1790

logger.warning("GnuTLS bye failed",

1791

exc_info=error)

1452

1792

1453

1793

@staticmethod

1454

1794

def peer_certificate(session):

1510

1850

# Convert the buffer to a Python bytestring

1511

1851

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

1512

1852

# Convert the bytestring to hexadecimal notation

1513

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

1853

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

1514

1854

return hex_fpr

1515

1855

1516

1856

1519

1859

def sub_process_main(self, request, address):

1520

1860

try:

1521

1861

self.finish_request(request, address)

1522

except:

1862

except Exception:

1523

1863

self.handle_error(request, address)

1524

1864

self.close_request(request)

1525

1865

1526

1866

def process_request(self, request, address):

1527

1867

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

1528

1868

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

1529

args = (request,

1530

address))

1869

args = (request, address))

1531

1870

proc.start()

1532

1871

return proc

1533

1872

1630

1969

self.enabled = False

1631

1970

self.clients = clients

1632

1971

if self.clients is None:

1633

self.clients = set()

1972

self.clients = {}

1634

1973

self.use_dbus = use_dbus

1635

1974

self.gnutls_priority = gnutls_priority

1636

1975

IPv6_TCPServer.__init__(self, server_address,

1655

1994

1656

1995

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

1657

1996

proc = None, client_object=None):

1658

condition_names = {

1659

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

1660

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

1661

# blocking).

1662

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

1663

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

1664

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

1665

# broken, usually for pipes and

1666

# sockets).

1667

}

1668

conditions_string = ' | '.join(name

1669

for cond, name in

1670

condition_names.iteritems()

1671

if cond & condition)

1672

1997

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

1673

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

1998

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

1674

1999

# Wait for other process to exit

1675

2000

proc.join()

1676

2001

return False

1683

2008

fpr = request[1]

1684

2009

address = request[2]

1685

2010

1686

for c in self.clients:

2011

for c in self.clients.itervalues():

1687

2012

if c.fingerprint == fpr:

1688

2013

client = c

1689

2014

break

1766

2091

elif suffix == "w":

1767

2092

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

1768

2093

else:

1769

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

2094

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

2095

.format(suffix))

1770

2096

except (ValueError, IndexError) as e:

1771

2097

raise ValueError(*(e.args))

1772

2098

timevalue += delta

1773

2099

return timevalue

1774

2100

1775

2101

1776

def if_nametoindex(interface):

1777

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

1778

1779

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

1780

global if_nametoindex

1781

try:

1782

if_nametoindex = (ctypes.cdll.LoadLibrary

1783

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

1784

.if_nametoindex)

1785

except (OSError, AttributeError):

1786

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

1787

def if_nametoindex(interface):

1788

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

1789

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

1790

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

1791

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1792

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

1793

interface))

1794

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

1795

ifreq[16:20])[0]

1796

return interface_index

1797

return if_nametoindex(interface)

1798

1799

1800

2102

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

1801

2103

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

1802

2104

1810

2112

sys.exit()

1811

2113

if not noclose:

1812

2114

# Close all standard open file descriptors

1813

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

2115

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

1814

2116

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

1815

2117

raise OSError(errno.ENODEV,

1816

"%s not a character device"

1817

% os.path.devnull)

2118

"{0} not a character device"

2119

.format(os.devnull))

1818

2120

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

1819

2121

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

1820

2122

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

1829

2131

1830

2132

parser = argparse.ArgumentParser()

1831

2133

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

1832

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

2134

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

1833

2135

help="show version number and exit")

1834

2136

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

1835

2137

help="Bind to interface IF")

1857

2159

" system bus interface")

1858

2160

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

1859

2161

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

1860

2168

options = parser.parse_args()

1861

2169

1862

2170

if options.check:

1875

2183

"use_dbus": "True",

1876

2184

"use_ipv6": "True",

1877

2185

"debuglevel": "",

2186

"restore": "True",

2187

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

1878

2188

}

1879

2189

1880

2190

# Parse config file for server-global settings

1897

2207

# options, if set.

1898

2208

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

1899

2209

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

1900

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

2210

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

2211

"statedir"):

1901

2212

value = getattr(options, option)

1902

2213

if value is not None:

1903

2214

server_settings[option] = value

1915

2226

debuglevel = server_settings["debuglevel"]

1916

2227

use_dbus = server_settings["use_dbus"]

1917

2228

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)

1918

2240

1919

2241

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

1920

2242

syslogger.setFormatter(logging.Formatter

1921

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

1922

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

1923

% server_settings["servicename"]))

2243

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

2244

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

2245

.format(server_settings

2246

["servicename"])))

1924

2247

1925

2248

# Parse config file with clients

1926

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

1927

"extended_timeout": "15m",

1928

"interval": "2m",

1929

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

1930

"host": "",

1931

"approval_delay": "0s",

1932

"approval_duration": "1s",

1933

}

1934

client_config = configparser.SafeConfigParser(client_defaults)

2249

client_config = configparser.SafeConfigParser(Client

2250

.client_defaults)

1935

2251

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

1936

2252

"clients.conf"))

1937

2253

1951

2267

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

1952

2268

try:

1953

2269

pidfile = open(pidfilename, "w")

1954

except IOError:

1955

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

2270

except IOError as e:

2271

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

2272

exc_info=e)

1956

2273

1957

try:

1958

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

1959

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

1960

except KeyError:

2274

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

1961

2275

try:

1962

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

1963

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

2276

uid = pwd.getpwnam(name).pw_uid

2277

gid = pwd.getpwnam(name).pw_gid

2278

break

1964

2279

except KeyError:

1965

try:

1966

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

1967

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

1968

except KeyError:

1969

uid = 65534

1970

gid = 65534

2280

continue

2281

else:

2282

uid = 65534

2283

gid = 65534

1971

2284

try:

1972

2285

os.setgid(gid)

1973

2286

os.setuid(uid)

1975

2288

if error[0] != errno.EPERM:

1976

2289

raise error

1977

2290

1978

if not debug and not debuglevel:

1979

logger.setLevel(logging.WARNING)

1980

if debuglevel:

1981

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

1982

logger.setLevel(level)

1983

1984

2291

if debug:

1985

logger.setLevel(logging.DEBUG)

1986

2292

# Enable all possible GnuTLS debugging

1987

2293

1988

2294

# "Use a log level over 10 to enable all debugging options."

1997

2303

.gnutls_global_set_log_function(debug_gnutls))

1998

2304

1999

2305

# Redirect stdin so all checkers get /dev/null

2000

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

2306

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

2001

2307

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

2002

2308

if null > 2:

2003

2309

os.close(null)

2004

else:

2005

# No console logging

2006

logger.removeHandler(console)

2007

2310

2008

2311

# Need to fork before connecting to D-Bus

2009

2312

if not debug:

2010

2313

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

2011

2314

daemon()

2012

2315

2316

gobject.threads_init()

2317

2013

2318

global main_loop

2014

2319

# From the Avahi example code

2015

DBusGMainLoop(set_as_default=True )

2320

DBusGMainLoop(set_as_default=True)

2016

2321

main_loop = gobject.MainLoop()

2017

2322

bus = dbus.SystemBus()

2018

2323

# End of Avahi example code

2024

2329

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

2025

2330

do_not_queue=True))

2026

2331

except dbus.exceptions.NameExistsException as e:

2027

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

2332

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

2028

2333

use_dbus = False

2029

2334

server_settings["use_dbus"] = False

2030

2335

tcp_server.use_dbus = False

2042

2347

2043

2348

client_class = Client

2044

2349

if use_dbus:

2045

client_class = functools.partial(ClientDBusTransitional,

2046

bus = bus)

2047

def client_config_items(config, section):

2048

special_settings = {

2049

"approved_by_default":

2050

lambda: config.getboolean(section,

2051

"approved_by_default"),

2052

}

2053

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

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))

2054

2421

try:

2055

yield (name, special_settings[name]())

2056

except KeyError:

2057

yield (name, value)

2058

2059

tcp_server.clients.update(set(

2060

client_class(name = section,

2061

config= dict(client_config_items(

2062

client_config, section)))

2063

for section in client_config.sections()))

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

2064

2446

if not tcp_server.clients:

2065

2447

logger.warning("No clients defined")

2066

2448

2067

2449

if not debug:

2068

2450

try:

2069

2451

with pidfile:

2077

2459

# "pidfile" was never created

2078

2460

pass

2079

2461

del pidfilename

2080

2081

2462

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

2082

2463

2083

2464

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

2084

2465

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

2085

2466

2086

2467

if use_dbus:

2087

class MandosDBusService(dbus.service.Object):

2468

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

2469

"se.bsnet.fukt.Mandos"})

2470

class MandosDBusService(DBusObjectWithProperties):

2088

2471

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

2089

2472

def __init__(self):

2090

2473

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

2091

2474

_interface = "se.recompile.Mandos"

2092

2475

2476

@dbus_interface_annotations(_interface)

2477

def _foo(self):

2478

return { "org.freedesktop.DBus.Property"

2479

".EmitsChangedSignal":

2480

"false"}

2481

2093

2482

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

2094

2483

def ClientAdded(self, objpath):

2095

2484

"D-Bus signal"

2109

2498

def GetAllClients(self):

2110

2499

"D-Bus method"

2111

2500

return dbus.Array(c.dbus_object_path

2112

for c in tcp_server.clients)

2501

for c in

2502

tcp_server.clients.itervalues())

2113

2503

2114

2504

@dbus.service.method(_interface,

2115

2505

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

2117

2507

"D-Bus method"

2118

2508

return dbus.Dictionary(

2119

2509

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

2120

for c in tcp_server.clients),

2510

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

2121

2511

signature="oa{sv}")

2122

2512

2123

2513

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

2124

2514

def RemoveClient(self, object_path):

2125

2515

"D-Bus method"

2126

for c in tcp_server.clients:

2516

for c in tcp_server.clients.itervalues():

2127

2517

if c.dbus_object_path == object_path:

2128

tcp_server.clients.remove(c)

2518

del tcp_server.clients[c.name]

2129

2519

c.remove_from_connection()

2130

2520

# Don't signal anything except ClientRemoved

2131

2521

c.disable(quiet=True)

2136

2526

2137

2527

del _interface

2138

2528

2139

class MandosDBusServiceTransitional(MandosDBusService):

2140

__metaclass__ = AlternateDBusNamesMetaclass

2141

mandos_dbus_service = MandosDBusServiceTransitional()

2529

mandos_dbus_service = MandosDBusService()

2142

2530

2143

2531

def cleanup():

2144

2532

"Cleanup function; run on exit"

2145

2533

service.cleanup()

2146

2534

2147

2535

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

2148

2590

while tcp_server.clients:

2149

client = tcp_server.clients.pop()

2591

name, client = tcp_server.clients.popitem()

2150

2592

if use_dbus:

2151

2593

client.remove_from_connection()

2152

client.disable_hook = None

2153

2594

# Don't signal anything except ClientRemoved

2154

2595

client.disable(quiet=True)

2155

2596

if use_dbus:

2157

2598

mandos_dbus_service.ClientRemoved(client

2158

2599

.dbus_object_path,

2159

2600

client.name)

2601

client_settings.clear()

2160

2602

2161

2603

atexit.register(cleanup)

2162

2604

2163

for client in tcp_server.clients:

2605

for client in tcp_server.clients.itervalues():

2164

2606

if use_dbus:

2165

2607

# Emit D-Bus signal

2166

2608

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2167

client.enable()

2609

# Need to initiate checking of clients

2610

if client.enabled:

2611

client.init_checker()

2168

2612

2169

2613

tcp_server.enable()

2170

2614

tcp_server.server_activate()

2173

2617

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

2174

2618

if use_ipv6:

2175

2619

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

2176

" flowinfo %d, scope_id %d"

2177

% tcp_server.socket.getsockname())

2620

" flowinfo %d, scope_id %d",

2621

*tcp_server.socket.getsockname())

2178

2622

else: # IPv4

2179

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

2180

% tcp_server.socket.getsockname())

2623

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

2624

*tcp_server.socket.getsockname())

2181

2625

2182

2626

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

2183

2627

2186

2630

try:

2187

2631

service.activate()

2188

2632

except dbus.exceptions.DBusException as error:

2189

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

2633

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

2190

2634

cleanup()

2191

2635

sys.exit(1)

2192

2636

# End of Avahi example code

2199

2643

logger.debug("Starting main loop")

2200

2644

main_loop.run()

2201

2645

except AvahiError as error:

2202

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

2646

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

2203

2647

cleanup()

2204

2648

sys.exit(1)

2205

2649

except KeyboardInterrupt:

2210

2654

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

2211

2655

cleanup()

2212

2656

2213

2214

2657

if __name__ == '__main__':

2215

2658

main()