/mandos/trunk : revision 575

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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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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 = "1.4.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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version = "1.5.3"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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def encrypt(self, data, password):

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

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

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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

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

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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class AvahiError(Exception):

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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.GetAlternativeServiceName(self.name))

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self .entry_group_state_changed))

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'StateChanged', self.entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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

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.format(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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dbus.exceptions.DBusException):

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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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_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")

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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()

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else:

499

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

510

client["last_approval_request"] = None

511

client["last_checked_ok"] = None

512

client["last_checker_status"] = -2

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return settings

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

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self.name = name

339

if config is None:

340

config = {}

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# adding all client settings

519

for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

523

if not hasattr(self, "last_enabled"):

524

self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

528

else:

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self.last_enabled = None

530

self.expires = None

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532

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

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533

# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

345

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

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.replace(" ", ""))

347

536

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

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if "secret" in config:

349

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

350

elif "secfile" in config:

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

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(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

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

359

self.created = datetime.datetime.utcnow()

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self.enabled = False

361

self.last_approval_request = None

362

self.last_enabled = None

363

self.last_checked_ok = None

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

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self.extended_timeout = string_to_delta(config

366

["extended_timeout"])

367

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

368

self.disable_hook = disable_hook

537

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

538

datetime.datetime.utcnow())

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# attributes specific for this server instance

369

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self.checker = None

370

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

372

self.expires = None

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544

self.checker_callback_tag = None

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self.checker_command = config["checker"]

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self.current_checker_command = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

546

self.approved = None

380

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self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

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config["approval_duration"])

385

548

self.changedstate = (multiprocessing_manager

386

549

.Condition(multiprocessing_manager

387

550

.Lock()))

551

self.client_structure = [attr for attr in

552

self.__dict__.iterkeys()

553

if not attr.startswith("_")]

554

self.client_structure.append("client_structure")

555

556

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

557

lambda obj:

558

isinstance(obj,

559

property)):

560

if not name.startswith("_"):

561

self.client_structure.append(name)

388

562

563

# Send notice to process children that client state has changed

389

564

def send_changedstate(self):

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

565

with self.changedstate:

566

self.changedstate.notify_all()

393

567

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568

def enable(self):

395

569

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

397

571

# Already enabled

398

572

return

399

573

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

406

574

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

407

self.disable_initiator_tag = (gobject.timeout_add

408

(self.timeout_milliseconds(),

409

self.disable))

410

575

self.enabled = True

411

576

self.last_enabled = datetime.datetime.utcnow()

412

# Also start a new checker *right now*.

413

self.start_checker()

577

self.init_checker()

414

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415

579

def disable(self, quiet=True):

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"""Disable this client."""

428

592

gobject.source_remove(self.checker_initiator_tag)

429

593

self.checker_initiator_tag = None

430

594

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

433

595

self.enabled = False

434

596

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

435

597

return False

436

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437

599

def __del__(self):

438

self.disable_hook = None

439

600

self.disable()

440

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602

def init_checker(self):

603

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

604

# and every interval from then on.

605

self.checker_initiator_tag = (gobject.timeout_add

606

(self.interval_milliseconds(),

607

self.start_checker))

608

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

609

self.disable_initiator_tag = (gobject.timeout_add

610

(self.timeout_milliseconds(),

611

self.disable))

612

# Also start a new checker *right now*.

613

self.start_checker()

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615

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

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

443

617

self.checker_callback_tag = None

444

618

self.checker = None

445

619

if os.WIFEXITED(condition):

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

620

self.last_checker_status = os.WEXITSTATUS(condition)

621

if self.last_checker_status == 0:

448

622

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

449

623

vars(self))

450

624

self.checked_ok()

452

626

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

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627

vars(self))

454

628

else:

629

self.last_checker_status = -1

455

630

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

456

631

vars(self))

457

632

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

"""

633

def checked_ok(self):

634

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

635

self.last_checked_ok = datetime.datetime.utcnow()

636

self.last_checker_status = 0

637

self.bump_timeout()

638

639

def bump_timeout(self, timeout=None):

640

"""Bump up the timeout for this client."""

464

641

if timeout is None:

465

642

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

467

gobject.source_remove(self.disable_initiator_tag)

468

self.disable_initiator_tag = (gobject.timeout_add

469

(_timedelta_to_milliseconds

470

(timeout), self.disable))

471

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

643

if self.disable_initiator_tag is not None:

644

gobject.source_remove(self.disable_initiator_tag)

645

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

646

self.disable_initiator_tag = (gobject.timeout_add

647

(timedelta_to_milliseconds

648

(timeout), self.disable))

649

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

472

650

473

651

def need_approval(self):

474

652

self.last_approval_request = datetime.datetime.utcnow()

518

696

try:

519

697

command = self.checker_command % escaped_attrs

520

698

except TypeError as error:

521

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

522

' %s', self.checker_command, error)

699

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

700

self.checker_command, exc_info=error)

523

701

return True # Try again later

524

702

self.current_checker_command = command

525

703

try:

543

721

gobject.source_remove(self.checker_callback_tag)

544

722

self.checker_callback(pid, status, command)

545

723

except OSError as error:

546

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

547

error)

724

logger.error("Failed to start subprocess",

725

exc_info=error)

548

726

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

549

727

return True

550

728

557

735

return

558

736

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

559

737

try:

560

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

738

self.checker.terminate()

561

739

#time.sleep(0.5)

562

740

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

563

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

741

# self.checker.kill()

564

742

except OSError as error:

565

743

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

566

744

raise

583

761

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

584

762

if byte_arrays and signature != "ay":

585

763

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

586

" signature %r" % signature)

764

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

587

765

def decorator(func):

588

766

func._dbus_is_property = True

589

767

func._dbus_interface = dbus_interface

597

775

return decorator

598

776

599

777

778

def dbus_interface_annotations(dbus_interface):

779

"""Decorator for marking functions returning interface annotations

780

781

Usage:

782

783

@dbus_interface_annotations("org.example.Interface")

784

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

785

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

786

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

787

"false"}

788

"""

789

def decorator(func):

790

func._dbus_is_interface = True

791

func._dbus_interface = dbus_interface

792

func._dbus_name = dbus_interface

793

return func

794

return decorator

795

796

797

def dbus_annotations(annotations):

798

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

799

Usage:

800

801

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

802

access="r")

803

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

804

"org.freedesktop.DBus.Property."

805

"EmitsChangedSignal": "false"})

806

def Property_dbus_property(self):

807

return dbus.Boolean(False)

808

"""

809

def decorator(func):

810

func._dbus_annotations = annotations

811

return func

812

return decorator

813

814

600

815

class DBusPropertyException(dbus.exceptions.DBusException):

601

816

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

602

817

"""

625

840

"""

626

841

627

842

@staticmethod

628

def _is_dbus_property(obj):

629

return getattr(obj, "_dbus_is_property", False)

843

def _is_dbus_thing(thing):

844

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

845

846

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

847

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

848

"""

849

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

850

False)

630

851

631

def _get_all_dbus_properties(self):

852

def _get_all_dbus_things(self, thing):

632

853

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

633

854

"""

634

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

855

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

856

name),

857

athing.__get__(self))

635

858

for cls in self.__class__.__mro__

636

for name, prop in

637

inspect.getmembers(cls, self._is_dbus_property))

859

for name, athing in

860

inspect.getmembers(cls,

861

self._is_dbus_thing(thing)))

638

862

639

863

def _get_dbus_property(self, interface_name, property_name):

640

864

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

642

866

"""

643

867

for cls in self.__class__.__mro__:

644

868

for name, value in (inspect.getmembers

645

(cls, self._is_dbus_property)):

869

(cls,

870

self._is_dbus_thing("property"))):

646

871

if (value._dbus_name == property_name

647

872

and value._dbus_interface == interface_name):

648

873

return value.__get__(self)

677

902

# signatures other than "ay".

678

903

if prop._dbus_signature != "ay":

679

904

raise ValueError

680

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

681

for byte in value))

905

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

906

for byte in value))

682

907

prop(value)

683

908

684

909

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

689

914

690

915

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

691

916

"""

692

all = {}

693

for name, prop in self._get_all_dbus_properties():

917

properties = {}

918

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

694

919

if (interface_name

695

920

and interface_name != prop._dbus_interface):

696

921

# Interface non-empty but did not match

700

925

continue

701

926

value = prop()

702

927

if not hasattr(value, "variant_level"):

703

all[name] = value

928

properties[name] = value

704

929

continue

705

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

706

value.variant_level+1)

707

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

930

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

931

value.variant_level+1)

932

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

708

933

709

934

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

710

935

out_signature="s",

711

936

path_keyword='object_path',

712

937

connection_keyword='connection')

713

938

def Introspect(self, object_path, connection):

714

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

939

"""Overloading of standard D-Bus method.

940

941

Inserts property tags and interface annotation tags.

715

942

"""

716

943

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

717

944

connection)

724

951

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

725

952

return e

726

953

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

954

# Add property tags

727

955

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

728

956

for name, prop

729

in self._get_all_dbus_properties()

957

in self._get_all_dbus_things("property")

730

958

if prop._dbus_interface

731

959

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

732

960

if_tag.appendChild(tag)

961

# Add annotation tags

962

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

963

for tag in if_tag.getElementsByTagName(typ):

964

annots = dict()

965

for name, prop in (self.

966

_get_all_dbus_things(typ)):

967

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

968

and prop._dbus_interface

969

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

970

annots.update(getattr

971

(prop,

972

"_dbus_annotations",

973

{}))

974

for name, value in annots.iteritems():

975

ann_tag = document.createElement(

976

"annotation")

977

ann_tag.setAttribute("name", name)

978

ann_tag.setAttribute("value", value)

979

tag.appendChild(ann_tag)

980

# Add interface annotation tags

981

for annotation, value in dict(

982

itertools.chain(

983

*(annotations().iteritems()

984

for name, annotations in

985

self._get_all_dbus_things("interface")

986

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

987

))).iteritems():

988

ann_tag = document.createElement("annotation")

989

ann_tag.setAttribute("name", annotation)

990

ann_tag.setAttribute("value", value)

991

if_tag.appendChild(ann_tag)

733

992

# Add the names to the return values for the

734

993

# "org.freedesktop.DBus.Properties" methods

735

994

if (if_tag.getAttribute("name")

750

1009

except (AttributeError, xml.dom.DOMException,

751

1010

xml.parsers.expat.ExpatError) as error:

752

1011

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

753

error)

1012

exc_info=error)

754

1013

return xmlstring

755

1014

756

1015

761

1020

return dbus.String(dt.isoformat(),

762

1021

variant_level=variant_level)

763

1022

764

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

765

.__metaclass__):

766

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

767

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

1023

1024

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1025

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

1026

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

1027

interface names according to the "alt_interface_names" mapping.

1028

Usage:

1029

1030

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

1031

"net.example.AlternateInterface"})

1032

class SampleDBusObject(dbus.service.Object):

1033

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

1034

def SampleDBusMethod():

1035

pass

1036

1037

The above "SampleDBusMethod" on "SampleDBusObject" will be

1038

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

1039

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

1040

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

1041

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

1042

1043

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

1044

(from DBusObjectWithProperties) and interfaces (from the

1045

dbus_interface_annotations decorator).

768

1046

"""

769

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

770

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

771

# methods, signals, or properties in them

772

for base in (b for b in bases

773

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

774

# Go though all attributes of the base class

775

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

1047

def wrapper(cls):

1048

for orig_interface_name, alt_interface_name in (

1049

alt_interface_names.iteritems()):

1050

attr = {}

1051

interface_names = set()

1052

# Go though all attributes of the class

1053

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

776

1054

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

777

1055

# with the wrong interface name

778

1056

if (not hasattr(attribute, "_dbus_interface")

779

1057

or not attribute._dbus_interface

780

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

1058

.startswith(orig_interface_name)):

781

1059

continue

782

1060

# Create an alternate D-Bus interface name based on

783

1061

# the current name

784

1062

alt_interface = (attribute._dbus_interface

785

.replace("se.recompile.Mandos",

786

"se.bsnet.fukt.Mandos"))

1063

.replace(orig_interface_name,

1064

alt_interface_name))

1065

interface_names.add(alt_interface)

787

1066

# Is this a D-Bus signal?

788

1067

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

789

1068

# Extract the original non-method function by

804

1083

nonmethod_func.func_name,

805

1084

nonmethod_func.func_defaults,

806

1085

nonmethod_func.func_closure)))

1086

# Copy annotations, if any

1087

try:

1088

new_function._dbus_annotations = (

1089

dict(attribute._dbus_annotations))

1090

except AttributeError:

1091

pass

807

1092

# Define a creator of a function to call both the

808

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

809

# signals gets sent when the function is called

1093

# original and alternate functions, so both the

1094

# original and alternate signals gets sent when

1095

# the function is called

810

1096

def fixscope(func1, func2):

811

1097

"""This function is a scope container to pass

812

1098

func1 and func2 to the "call_both" function

819

1105

return call_both

820

1106

# Create the "call_both" function and add it to

821

1107

# the class

822

attr[attrname] = fixscope(attribute,

823

new_function)

1108

attr[attrname] = fixscope(attribute, new_function)

824

1109

# Is this a D-Bus method?

825

1110

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

826

1111

# Create a new, but exactly alike, function

837

1122

attribute.func_name,

838

1123

attribute.func_defaults,

839

1124

attribute.func_closure)))

1125

# Copy annotations, if any

1126

try:

1127

attr[attrname]._dbus_annotations = (

1128

dict(attribute._dbus_annotations))

1129

except AttributeError:

1130

pass

840

1131

# Is this a D-Bus property?

841

1132

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

842

1133

# Create a new, but exactly alike, function

856

1147

attribute.func_name,

857

1148

attribute.func_defaults,

858

1149

attribute.func_closure)))

859

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

860

1150

# Copy annotations, if any

1151

try:

1152

attr[attrname]._dbus_annotations = (

1153

dict(attribute._dbus_annotations))

1154

except AttributeError:

1155

pass

1156

# Is this a D-Bus interface?

1157

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

1158

# Create a new, but exactly alike, function

1159

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

1160

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

1161

# to the class.

1162

attr[attrname] = (dbus_interface_annotations

1163

(alt_interface)

1164

(types.FunctionType

1165

(attribute.func_code,

1166

attribute.func_globals,

1167

attribute.func_name,

1168

attribute.func_defaults,

1169

attribute.func_closure)))

1170

if deprecate:

1171

# Deprecate all alternate interfaces

1172

iname="_AlternateDBusNames_interface_annotation{0}"

1173

for interface_name in interface_names:

1174

@dbus_interface_annotations(interface_name)

1175

def func(self):

1176

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

1177

"true" }

1178

# Find an unused name

1179

for aname in (iname.format(i)

1180

for i in itertools.count()):

1181

if aname not in attr:

1182

attr[aname] = func

1183

break

1184

if interface_names:

1185

# Replace the class with a new subclass of it with

1186

# methods, signals, etc. as created above.

1187

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

1188

(cls,), attr)

1189

return cls

1190

return wrapper

1191

1192

1193

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

1194

"se.bsnet.fukt.Mandos"})

861

1195

class ClientDBus(Client, DBusObjectWithProperties):

862

1196

"""A Client class using D-Bus

863

1197

872

1206

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

873

1207

874

1208

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

875

self._approvals_pending = 0

876

1209

self.bus = bus

877

1210

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

878

1211

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

884

1217

("/clients/" + client_object_name))

885

1218

DBusObjectWithProperties.__init__(self, self.bus,

886

1219

self.dbus_object_path)

887

1220

888

1221

def notifychangeproperty(transform_func,

889

1222

dbus_name, type_func=lambda x: x,

890

1223

variant_level=1):

891

1224

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

892

1225

its changes to DBus.

893

894

transform_fun: Function that takes a value and transforms it

895

to a D-Bus type.

1226

1227

transform_fun: Function that takes a value and a variant_level

1228

and transforms it to a D-Bus type.

896

1229

dbus_name: D-Bus name of the variable

897

1230

type_func: Function that transform the value before sending it

898

1231

to the D-Bus. Default: no transform

905

1238

type_func(getattr(self, attrname, None))

906

1239

!= type_func(value)):

907

1240

dbus_value = transform_func(type_func(value),

908

variant_level)

1241

variant_level

1242

=variant_level)

909

1243

self.PropertyChanged(dbus.String(dbus_name),

910

1244

dbus_value)

911

1245

setattr(self, attrname, value)

912

1246

913

1247

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

914

1248

915

916

1249

expires = notifychangeproperty(datetime_to_dbus, "Expires")

917

1250

approvals_pending = notifychangeproperty(dbus.Boolean,

918

1251

"ApprovalPending",

925

1258

checker is not None)

926

1259

last_checked_ok = notifychangeproperty(datetime_to_dbus,

927

1260

"LastCheckedOK")

1261

last_checker_status = notifychangeproperty(dbus.Int16,

1262

"LastCheckerStatus")

928

1263

last_approval_request = notifychangeproperty(

929

1264

datetime_to_dbus, "LastApprovalRequest")

930

1265

approved_by_default = notifychangeproperty(dbus.Boolean,

931

1266

"ApprovedByDefault")

932

approval_delay = notifychangeproperty(dbus.UInt16,

1267

approval_delay = notifychangeproperty(dbus.UInt64,

933

1268

"ApprovalDelay",

934

1269

type_func =

935

_timedelta_to_milliseconds)

1270

timedelta_to_milliseconds)

936

1271

approval_duration = notifychangeproperty(

937

dbus.UInt16, "ApprovalDuration",

938

type_func = _timedelta_to_milliseconds)

1272

dbus.UInt64, "ApprovalDuration",

1273

type_func = timedelta_to_milliseconds)

939

1274

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

940

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

1275

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

941

1276

type_func =

942

_timedelta_to_milliseconds)

1277

timedelta_to_milliseconds)

943

1278

extended_timeout = notifychangeproperty(

944

dbus.UInt16, "ExtendedTimeout",

945

type_func = _timedelta_to_milliseconds)

946

interval = notifychangeproperty(dbus.UInt16,

1279

dbus.UInt64, "ExtendedTimeout",

1280

type_func = timedelta_to_milliseconds)

1281

interval = notifychangeproperty(dbus.UInt64,

947

1282

"Interval",

948

1283

type_func =

949

_timedelta_to_milliseconds)

1284

timedelta_to_milliseconds)

950

1285

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

951

1286

952

1287

del notifychangeproperty

994

1329

return r

995

1330

996

1331

def _reset_approved(self):

997

self._approved = None

1332

self.approved = None

998

1333

return False

999

1334

1000

1335

def approve(self, value=True):

1001

1336

self.send_changedstate()

1002

self._approved = value

1003

gobject.timeout_add(_timedelta_to_milliseconds

1337

self.approved = value

1338

gobject.timeout_add(timedelta_to_milliseconds

1004

1339

(self.approval_duration),

1005

1340

self._reset_approved)

1006

1341

1007

1008

1342

## D-Bus methods, signals & properties

1009

1343

_interface = "se.recompile.Mandos.Client"

1010

1344

1345

## Interfaces

1346

1347

@dbus_interface_annotations(_interface)

1348

def _foo(self):

1349

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

1350

"false"}

1351

1011

1352

## Signals

1012

1353

1013

1354

# CheckerCompleted - signal

1112

1453

access="readwrite")

1113

1454

def ApprovalDuration_dbus_property(self, value=None):

1114

1455

if value is None: # get

1115

return dbus.UInt64(_timedelta_to_milliseconds(

1456

return dbus.UInt64(timedelta_to_milliseconds(

1116

1457

self.approval_duration))

1117

1458

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

1118

1459

1132

1473

def Host_dbus_property(self, value=None):

1133

1474

if value is None: # get

1134

1475

return dbus.String(self.host)

1135

self.host = value

1476

self.host = unicode(value)

1136

1477

1137

1478

# Created - property

1138

1479

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

1139

1480

def Created_dbus_property(self):

1140

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

1481

return datetime_to_dbus(self.created)

1141

1482

1142

1483

# LastEnabled - property

1143

1484

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

1164

1505

return

1165

1506

return datetime_to_dbus(self.last_checked_ok)

1166

1507

1508

# LastCheckerStatus - property

1509

@dbus_service_property(_interface, signature="n",

1510

access="read")

1511

def LastCheckerStatus_dbus_property(self):

1512

return dbus.Int16(self.last_checker_status)

1513

1167

1514

# Expires - property

1168

1515

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

1169

1516

def Expires_dbus_property(self):

1181

1528

if value is None: # get

1182

1529

return dbus.UInt64(self.timeout_milliseconds())

1183

1530

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

1184

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

1185

return

1186

1531

# Reschedule timeout

1187

gobject.source_remove(self.disable_initiator_tag)

1188

self.disable_initiator_tag = None

1189

self.expires = None

1190

time_to_die = (self.

1191

_timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow()))

1196

if time_to_die <= 0:

1197

# The timeout has passed

1198

self.disable()

1199

else:

1200

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

1201

+ datetime.timedelta(milliseconds =

1202

time_to_die))

1203

self.disable_initiator_tag = (gobject.timeout_add

1204

(time_to_die, self.disable))

1532

if self.enabled:

1533

now = datetime.datetime.utcnow()

1534

time_to_die = timedelta_to_milliseconds(

1535

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

1536

if time_to_die <= 0:

1537

# The timeout has passed

1538

self.disable()

1539

else:

1540

self.expires = (now +

1541

datetime.timedelta(milliseconds =

1542

time_to_die))

1543

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

1544

is None):

1545

return

1546

gobject.source_remove(self.disable_initiator_tag)

1547

self.disable_initiator_tag = (gobject.timeout_add

1548

(time_to_die,

1549

self.disable))

1205

1550

1206

1551

# ExtendedTimeout - property

1207

1552

@dbus_service_property(_interface, signature="t",

1220

1565

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

1221

1566

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

1222

1567

return

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

1568

if self.enabled:

1569

# Reschedule checker run

1570

gobject.source_remove(self.checker_initiator_tag)

1571

self.checker_initiator_tag = (gobject.timeout_add

1572

(value, self.start_checker))

1573

self.start_checker() # Start one now, too

1228

1574

1229

1575

# Checker - property

1230

1576

@dbus_service_property(_interface, signature="s",

1232

1578

def Checker_dbus_property(self, value=None):

1233

1579

if value is None: # get

1234

1580

return dbus.String(self.checker_command)

1235

self.checker_command = value

1581

self.checker_command = unicode(value)

1236

1582

1237

1583

# CheckerRunning - property

1238

1584

@dbus_service_property(_interface, signature="b",

1267

1613

raise KeyError()

1268

1614

1269

1615

def __getattribute__(self, name):

1270

if(name == '_pipe'):

1616

if name == '_pipe':

1271

1617

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

1272

1618

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

1273

1619

data = self._pipe.recv()

1280

1626

return func

1281

1627

1282

1628

def __setattr__(self, name, value):

1283

if(name == '_pipe'):

1629

if name == '_pipe':

1284

1630

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

1285

1631

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

1286

1632

1287

class ClientDBusTransitional(ClientDBus):

1288

__metaclass__ = AlternateDBusNamesMetaclass

1289

1633

1290

1634

class ClientHandler(socketserver.BaseRequestHandler, object):

1291

1635

"""A class to handle client connections.

1374

1718

client.Rejected("Disabled")

1375

1719

return

1376

1720

1377

if client._approved or not client.approval_delay:

1721

if client.approved or not client.approval_delay:

1378

1722

#We are approved or approval is disabled

1379

1723

break

1380

elif client._approved is None:

1724

elif client.approved is None:

1381

1725

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

1382

1726

client.name)

1383

1727

if self.server.use_dbus:

1397

1741

time = datetime.datetime.now()

1398

1742

client.changedstate.acquire()

1399

1743

(client.changedstate.wait

1400

(float(client._timedelta_to_milliseconds(delay)

1744

(float(client.timedelta_to_milliseconds(delay)

1401

1745

/ 1000)))

1402

1746

client.changedstate.release()

1403

1747

time2 = datetime.datetime.now()

1420

1764

try:

1421

1765

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

1422

1766

except gnutls.errors.GNUTLSError as error:

1423

logger.warning("gnutls send failed")

1767

logger.warning("gnutls send failed",

1768

exc_info=error)

1424

1769

return

1425

1770

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

1426

1771

sent, len(client.secret)

1429

1774

1430

1775

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

1431

1776

# bump the timeout using extended_timeout

1432

client.checked_ok(client.extended_timeout)

1777

client.bump_timeout(client.extended_timeout)

1433

1778

if self.server.use_dbus:

1434

1779

# Emit D-Bus signal

1435

1780

client.GotSecret()

1440

1785

try:

1441

1786

session.bye()

1442

1787

except gnutls.errors.GNUTLSError as error:

1443

logger.warning("GnuTLS bye failed")

1788

logger.warning("GnuTLS bye failed",

1789

exc_info=error)

1444

1790

1445

1791

@staticmethod

1446

1792

def peer_certificate(session):

1502

1848

# Convert the buffer to a Python bytestring

1503

1849

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

1504

1850

# Convert the bytestring to hexadecimal notation

1505

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

1851

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

1506

1852

return hex_fpr

1507

1853

1508

1854

1511

1857

def sub_process_main(self, request, address):

1512

1858

try:

1513

1859

self.finish_request(request, address)

1514

except:

1860

except Exception:

1515

1861

self.handle_error(request, address)

1516

1862

self.close_request(request)

1517

1863

1622

1968

self.enabled = False

1623

1969

self.clients = clients

1624

1970

if self.clients is None:

1625

self.clients = set()

1971

self.clients = {}

1626

1972

self.use_dbus = use_dbus

1627

1973

self.gnutls_priority = gnutls_priority

1628

1974

IPv6_TCPServer.__init__(self, server_address,

1675

2021

fpr = request[1]

1676

2022

address = request[2]

1677

2023

1678

for c in self.clients:

2024

for c in self.clients.itervalues():

1679

2025

if c.fingerprint == fpr:

1680

2026

client = c

1681

2027

break

1758

2104

elif suffix == "w":

1759

2105

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

1760

2106

else:

1761

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

2107

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

2108

.format(suffix))

1762

2109

except (ValueError, IndexError) as e:

1763

2110

raise ValueError(*(e.args))

1764

2111

timevalue += delta

1765

2112

return timevalue

1766

2113

1767

2114

1768

def if_nametoindex(interface):

1769

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

1770

1771

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

1772

global if_nametoindex

1773

try:

1774

if_nametoindex = (ctypes.cdll.LoadLibrary

1775

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

1776

.if_nametoindex)

1777

except (OSError, AttributeError):

1778

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

1779

def if_nametoindex(interface):

1780

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

1781

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

1782

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

1783

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1784

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

1785

interface))

1786

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

1787

ifreq[16:20])[0]

1788

return interface_index

1789

return if_nametoindex(interface)

1790

1791

1792

2115

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

1793

2116

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

1794

2117

1802

2125

sys.exit()

1803

2126

if not noclose:

1804

2127

# Close all standard open file descriptors

1805

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

2128

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

1806

2129

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

1807

2130

raise OSError(errno.ENODEV,

1808

"%s not a character device"

1809

% os.path.devnull)

2131

"{0} not a character device"

2132

.format(os.devnull))

1810

2133

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

1811

2134

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

1812

2135

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

1821

2144

1822

2145

parser = argparse.ArgumentParser()

1823

2146

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

1824

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

2147

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

1825

2148

help="show version number and exit")

1826

2149

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

1827

2150

help="Bind to interface IF")

1849

2172

" system bus interface")

1850

2173

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

1851

2174

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

2175

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

2176

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

2177

" state")

2178

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

2179

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

2180

1852

2181

options = parser.parse_args()

1853

2182

1854

2183

if options.check:

1867

2196

"use_dbus": "True",

1868

2197

"use_ipv6": "True",

1869

2198

"debuglevel": "",

2199

"restore": "True",

2200

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

1870

2201

}

1871

2202

1872

2203

# Parse config file for server-global settings

1889

2220

# options, if set.

1890

2221

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

1891

2222

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

1892

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

2223

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

2224

"statedir"):

1893

2225

value = getattr(options, option)

1894

2226

if value is not None:

1895

2227

server_settings[option] = value

1907

2239

debuglevel = server_settings["debuglevel"]

1908

2240

use_dbus = server_settings["use_dbus"]

1909

2241

use_ipv6 = server_settings["use_ipv6"]

2242

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

2243

stored_state_file)

2244

2245

if debug:

2246

initlogger(debug, logging.DEBUG)

2247

else:

2248

if not debuglevel:

2249

initlogger(debug)

2250

else:

2251

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

2252

initlogger(debug, level)

1910

2253

1911

2254

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

1912

2255

syslogger.setFormatter(logging.Formatter

1913

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

1914

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

1915

% server_settings["servicename"]))

2256

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

2257

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

2258

.format(server_settings

2259

["servicename"])))

1916

2260

1917

2261

# Parse config file with clients

1918

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

1919

"extended_timeout": "15m",

1920

"interval": "2m",

1921

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

1922

"host": "",

1923

"approval_delay": "0s",

1924

"approval_duration": "1s",

1925

}

1926

client_config = configparser.SafeConfigParser(client_defaults)

2262

client_config = configparser.SafeConfigParser(Client

2263

.client_defaults)

1927

2264

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

1928

2265

"clients.conf"))

1929

2266

1943

2280

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

1944

2281

try:

1945

2282

pidfile = open(pidfilename, "w")

1946

except IOError:

1947

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

2283

except IOError as e:

2284

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

2285

exc_info=e)

1948

2286

1949

try:

1950

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

1951

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

1952

except KeyError:

2287

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

1953

2288

try:

1954

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

1955

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

2289

uid = pwd.getpwnam(name).pw_uid

2290

gid = pwd.getpwnam(name).pw_gid

2291

break

1956

2292

except KeyError:

1957

try:

1958

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

1959

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

1960

except KeyError:

1961

uid = 65534

1962

gid = 65534

2293

continue

2294

else:

2295

uid = 65534

2296

gid = 65534

1963

2297

try:

1964

2298

os.setgid(gid)

1965

2299

os.setuid(uid)

1967

2301

if error[0] != errno.EPERM:

1968

2302

raise error

1969

2303

1970

if not debug and not debuglevel:

1971

syslogger.setLevel(logging.WARNING)

1972

console.setLevel(logging.WARNING)

1973

if debuglevel:

1974

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

1975

syslogger.setLevel(level)

1976

console.setLevel(level)

1977

1978

2304

if debug:

1979

2305

# Enable all possible GnuTLS debugging

1980

2306

1990

2316

.gnutls_global_set_log_function(debug_gnutls))

1991

2317

1992

2318

# Redirect stdin so all checkers get /dev/null

1993

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

2319

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

1994

2320

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

1995

2321

if null > 2:

1996

2322

os.close(null)

1997

else:

1998

# No console logging

1999

logger.removeHandler(console)

2000

2323

2001

2324

# Need to fork before connecting to D-Bus

2002

2325

if not debug:

2003

2326

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

2004

2327

daemon()

2005

2328

2329

gobject.threads_init()

2330

2006

2331

global main_loop

2007

2332

# From the Avahi example code

2008

DBusGMainLoop(set_as_default=True )

2333

DBusGMainLoop(set_as_default=True)

2009

2334

main_loop = gobject.MainLoop()

2010

2335

bus = dbus.SystemBus()

2011

2336

# End of Avahi example code

2017

2342

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

2018

2343

do_not_queue=True))

2019

2344

except dbus.exceptions.NameExistsException as e:

2020

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

2345

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

2021

2346

use_dbus = False

2022

2347

server_settings["use_dbus"] = False

2023

2348

tcp_server.use_dbus = False

2024

2349

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2025

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

2026

servicetype = "_mandos._tcp",

2027

protocol = protocol, bus = bus)

2350

service = AvahiServiceToSyslog(name =

2351

server_settings["servicename"],

2352

servicetype = "_mandos._tcp",

2353

protocol = protocol, bus = bus)

2028

2354

if server_settings["interface"]:

2029

2355

service.interface = (if_nametoindex

2030

2356

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

2034

2360

2035

2361

client_class = Client

2036

2362

if use_dbus:

2037

client_class = functools.partial(ClientDBusTransitional,

2038

bus = bus)

2039

def client_config_items(config, section):

2040

special_settings = {

2041

"approved_by_default":

2042

lambda: config.getboolean(section,

2043

"approved_by_default"),

2044

}

2045

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

2363

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

2364

2365

client_settings = Client.config_parser(client_config)

2366

old_client_settings = {}

2367

clients_data = {}

2368

2369

# Get client data and settings from last running state.

2370

if server_settings["restore"]:

2371

try:

2372

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

2373

clients_data, old_client_settings = (pickle.load

2374

(stored_state))

2375

os.remove(stored_state_path)

2376

except IOError as e:

2377

if e.errno == errno.ENOENT:

2378

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

2379

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

2380

else:

2381

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

2382

exc_info=e)

2383

raise

2384

except EOFError as e:

2385

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

2386

"EOFError:", exc_info=e)

2387

2388

with PGPEngine() as pgp:

2389

for client_name, client in clients_data.iteritems():

2390

# Decide which value to use after restoring saved state.

2391

# We have three different values: Old config file,

2392

# new config file, and saved state.

2393

# New config value takes precedence if it differs from old

2394

# config value, otherwise use saved state.

2395

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

2396

try:

2397

# For each value in new config, check if it

2398

# differs from the old config value (Except for

2399

# the "secret" attribute)

2400

if (name != "secret" and

2401

value != old_client_settings[client_name]

2402

[name]):

2403

client[name] = value

2404

except KeyError:

2405

pass

2406

2407

# Clients who has passed its expire date can still be

2408

# enabled if its last checker was successful. Clients

2409

# whose checker succeeded before we stored its state is

2410

# assumed to have successfully run all checkers during

2411

# downtime.

2412

if client["enabled"]:

2413

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

2414

if not client["last_checked_ok"]:

2415

logger.warning(

2416

"disabling client {0} - Client never "

2417

"performed a successful checker"

2418

.format(client_name))

2419

client["enabled"] = False

2420

elif client["last_checker_status"] != 0:

2421

logger.warning(

2422

"disabling client {0} - Client "

2423

"last checker failed with error code {1}"

2424

.format(client_name,

2425

client["last_checker_status"]))

2426

client["enabled"] = False

2427

else:

2428

client["expires"] = (datetime.datetime

2429

.utcnow()

2430

+ client["timeout"])

2431

logger.debug("Last checker succeeded,"

2432

" keeping {0} enabled"

2433

.format(client_name))

2046

2434

try:

2047

yield (name, special_settings[name]())

2048

except KeyError:

2049

yield (name, value)

2050

2051

tcp_server.clients.update(set(

2052

client_class(name = section,

2053

config= dict(client_config_items(

2054

client_config, section)))

2055

for section in client_config.sections()))

2435

client["secret"] = (

2436

pgp.decrypt(client["encrypted_secret"],

2437

client_settings[client_name]

2438

["secret"]))

2439

except PGPError:

2440

# If decryption fails, we use secret from new settings

2441

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

2442

.format(client_name))

2443

client["secret"] = (

2444

client_settings[client_name]["secret"])

2445

2446

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

2447

for client_name in (set(old_client_settings)

2448

- set(client_settings)):

2449

del clients_data[client_name]

2450

for client_name in (set(client_settings)

2451

- set(old_client_settings)):

2452

clients_data[client_name] = client_settings[client_name]

2453

2454

# Create all client objects

2455

for client_name, client in clients_data.iteritems():

2456

tcp_server.clients[client_name] = client_class(

2457

name = client_name, settings = client)

2458

2056

2459

if not tcp_server.clients:

2057

2460

logger.warning("No clients defined")

2058

2461

2059

2462

if not debug:

2060

2463

try:

2061

2464

with pidfile:

2069

2472

# "pidfile" was never created

2070

2473

pass

2071

2474

del pidfilename

2072

2073

2475

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

2074

2476

2075

2477

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

2076

2478

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

2077

2479

2078

2480

if use_dbus:

2079

class MandosDBusService(dbus.service.Object):

2481

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

2482

"se.bsnet.fukt.Mandos"})

2483

class MandosDBusService(DBusObjectWithProperties):

2080

2484

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

2081

2485

def __init__(self):

2082

2486

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

2083

2487

_interface = "se.recompile.Mandos"

2084

2488

2489

@dbus_interface_annotations(_interface)

2490

def _foo(self):

2491

return { "org.freedesktop.DBus.Property"

2492

".EmitsChangedSignal":

2493

"false"}

2494

2085

2495

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

2086

2496

def ClientAdded(self, objpath):

2087

2497

"D-Bus signal"

2101

2511

def GetAllClients(self):

2102

2512

"D-Bus method"

2103

2513

return dbus.Array(c.dbus_object_path

2104

for c in tcp_server.clients)

2514

for c in

2515

tcp_server.clients.itervalues())

2105

2516

2106

2517

@dbus.service.method(_interface,

2107

2518

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

2109

2520

"D-Bus method"

2110

2521

return dbus.Dictionary(

2111

2522

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

2112

for c in tcp_server.clients),

2523

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

2113

2524

signature="oa{sv}")

2114

2525

2115

2526

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

2116

2527

def RemoveClient(self, object_path):

2117

2528

"D-Bus method"

2118

for c in tcp_server.clients:

2529

for c in tcp_server.clients.itervalues():

2119

2530

if c.dbus_object_path == object_path:

2120

tcp_server.clients.remove(c)

2531

del tcp_server.clients[c.name]

2121

2532

c.remove_from_connection()

2122

2533

# Don't signal anything except ClientRemoved

2123

2534

c.disable(quiet=True)

2128

2539

2129

2540

del _interface

2130

2541

2131

class MandosDBusServiceTransitional(MandosDBusService):

2132

__metaclass__ = AlternateDBusNamesMetaclass

2133

mandos_dbus_service = MandosDBusServiceTransitional()

2542

mandos_dbus_service = MandosDBusService()

2134

2543

2135

2544

def cleanup():

2136

2545

"Cleanup function; run on exit"

2137

2546

service.cleanup()

2138

2547

2139

2548

multiprocessing.active_children()

2549

if not (tcp_server.clients or client_settings):

2550

return

2551

2552

# Store client before exiting. Secrets are encrypted with key

2553

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

2554

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

2555

clients = {}

2556

with PGPEngine() as pgp:

2557

for client in tcp_server.clients.itervalues():

2558

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

2559

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

2560

key)

2561

client_dict = {}

2562

2563

# A list of attributes that can not be pickled

2564

# + secret.

2565

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

2566

"checker"))

2567

for name, typ in (inspect.getmembers

2568

(dbus.service.Object)):

2569

exclude.add(name)

2570

2571

client_dict["encrypted_secret"] = (client

2572

.encrypted_secret)

2573

for attr in client.client_structure:

2574

if attr not in exclude:

2575

client_dict[attr] = getattr(client, attr)

2576

2577

clients[client.name] = client_dict

2578

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

2579

2580

try:

2581

tempfd, tempname = tempfile.mkstemp(suffix=".pickle",

2582

prefix="clients-",

2583

dir=os.path.dirname

2584

(stored_state_path))

2585

with os.fdopen(tempfd, "wb") as stored_state:

2586

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

2587

os.rename(tempname, stored_state_path)

2588

except (IOError, OSError) as e:

2589

if not debug:

2590

try:

2591

os.remove(tempname)

2592

except NameError:

2593

pass

2594

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

2595

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

2596

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

2597

else:

2598

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

2599

exc_info=e)

2600

raise e

2601

2602

# Delete all clients, and settings from config

2140

2603

while tcp_server.clients:

2141

client = tcp_server.clients.pop()

2604

name, client = tcp_server.clients.popitem()

2142

2605

if use_dbus:

2143

2606

client.remove_from_connection()

2144

client.disable_hook = None

2145

2607

# Don't signal anything except ClientRemoved

2146

2608

client.disable(quiet=True)

2147

2609

if use_dbus:

2149

2611

mandos_dbus_service.ClientRemoved(client

2150

2612

.dbus_object_path,

2151

2613

client.name)

2614

client_settings.clear()

2152

2615

2153

2616

atexit.register(cleanup)

2154

2617

2155

for client in tcp_server.clients:

2618

for client in tcp_server.clients.itervalues():

2156

2619

if use_dbus:

2157

2620

# Emit D-Bus signal

2158

2621

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2159

client.enable()

2622

# Need to initiate checking of clients

2623

if client.enabled:

2624

client.init_checker()

2160

2625

2161

2626

tcp_server.enable()

2162

2627

tcp_server.server_activate()

2165

2630

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

2166

2631

if use_ipv6:

2167

2632

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

2168

" flowinfo %d, scope_id %d"

2169

% tcp_server.socket.getsockname())

2633

" flowinfo %d, scope_id %d",

2634

*tcp_server.socket.getsockname())

2170

2635

else: # IPv4

2171

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

2172

% tcp_server.socket.getsockname())

2636

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

2637

*tcp_server.socket.getsockname())

2173

2638

2174

2639

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

2175

2640

2178

2643

try:

2179

2644

service.activate()

2180

2645

except dbus.exceptions.DBusException as error:

2181

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

2646

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

2182

2647

cleanup()

2183

2648

sys.exit(1)

2184

2649

# End of Avahi example code

2191

2656

logger.debug("Starting main loop")

2192

2657

main_loop.run()

2193

2658

except AvahiError as error:

2194

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

2659

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

2195

2660

cleanup()

2196

2661

sys.exit(1)

2197

2662

except KeyboardInterrupt:

2202

2667

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

2203

2668

cleanup()

2204

2669

2205

2206

2670

if __name__ == '__main__':

2207

2671

main()