/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 hashlib

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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 Crypto.Cipher.AES

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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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stored_state_path = "/var/lib/mandos/clients.pickle"

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflect crashed

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checker, or None.

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last_enabled: datetime.datetime(); (UTC)

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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, 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:

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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"]

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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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return settings

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

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self.name = name

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if config is None:

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config = {}

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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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

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self.expires = None

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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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535

# function

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

360

.replace(" ", ""))

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536

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

362

if "secret" in config:

363

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

364

elif "secfile" in config:

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

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(config["secfile"])),

367

"rb") as secfile:

368

self.secret = secfile.read()

369

else:

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

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% self.name)

372

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

373

self.created = datetime.datetime.utcnow()

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self.enabled = True

375

self.last_approval_request = None

376

self.last_enabled = datetime.datetime.utcnow()

377

self.last_checked_ok = None

378

self.last_checker_status = None

379

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

380

self.extended_timeout = string_to_delta(config

381

["extended_timeout"])

382

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

537

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

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datetime.datetime.utcnow())

539

540

# attributes specific for this server instance

383

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self.checker = None

384

542

self.checker_initiator_tag = None

385

543

self.disable_initiator_tag = None

386

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

387

544

self.checker_callback_tag = None

388

self.checker_command = config["checker"]

389

545

self.current_checker_command = None

390

self._approved = None

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

392

True)

546

self.approved = None

393

547

self.approvals_pending = 0

394

self.approval_delay = string_to_delta(

395

config["approval_delay"])

396

self.approval_duration = string_to_delta(

397

config["approval_duration"])

398

548

self.changedstate = (multiprocessing_manager

399

549

.Condition(multiprocessing_manager

400

550

.Lock()))

401

self.client_structure = [attr for attr

402

in self.__dict__.iterkeys()

551

self.client_structure = [attr for attr in

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self.__dict__.iterkeys()

403

553

if not attr.startswith("_")]

404

554

self.client_structure.append("client_structure")

405

406

555

407

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

408

557

lambda obj:

409

558

isinstance(obj,

449

598

450

599

def __del__(self):

451

600

self.disable()

452

601

453

602

def init_checker(self):

454

603

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

455

604

# and every interval from then on.

462

611

self.disable))

463

612

# Also start a new checker *right now*.

464

613

self.start_checker()

465

466

614

467

615

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

468

616

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

469

617

self.checker_callback_tag = None

470

618

self.checker = None

471

619

if os.WIFEXITED(condition):

472

self.last_checker_status = os.WEXITSTATUS(condition)

620

self.last_checker_status = os.WEXITSTATUS(condition)

473

621

if self.last_checker_status == 0:

474

622

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

475

623

vars(self))

482

630

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

483

631

vars(self))

484

632

485

def checked_ok(self, timeout=None):

486

"""Bump up the timeout for this client.

487

488

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

489

alive and well.

490

"""

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."""

491

641

if timeout is None:

492

642

timeout = self.timeout

493

self.last_checked_ok = datetime.datetime.utcnow()

494

643

if self.disable_initiator_tag is not None:

495

644

gobject.source_remove(self.disable_initiator_tag)

496

645

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

497

646

self.disable_initiator_tag = (gobject.timeout_add

498

(_timedelta_to_milliseconds

647

(timedelta_to_milliseconds

499

648

(timeout), self.disable))

500

649

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

501

650

547

696

try:

548

697

command = self.checker_command % escaped_attrs

549

698

except TypeError as error:

550

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

551

' %s', self.checker_command, error)

699

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

700

self.checker_command, exc_info=error)

552

701

return True # Try again later

553

702

self.current_checker_command = command

554

703

try:

572

721

gobject.source_remove(self.checker_callback_tag)

573

722

self.checker_callback(pid, status, command)

574

723

except OSError as error:

575

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

576

error)

724

logger.error("Failed to start subprocess",

725

exc_info=error)

577

726

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

578

727

return True

579

728

586

735

return

587

736

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

588

737

try:

589

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

738

self.checker.terminate()

590

739

#time.sleep(0.5)

591

740

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

592

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

741

# self.checker.kill()

593

742

except OSError as error:

594

743

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

595

744

raise

596

745

self.checker = None

597

746

598

# Encrypts a client secret and stores it in a varible

599

# encrypted_secret

600

def encrypt_secret(self, key):

601

# Encryption-key need to be of a specific size, so we hash

602

# supplied key

603

hasheng = hashlib.sha256()

604

hasheng.update(key)

605

encryptionkey = hasheng.digest()

606

607

# Create validation hash so we know at decryption if it was

608

# sucessful

609

hasheng = hashlib.sha256()

610

hasheng.update(self.secret)

611

validationhash = hasheng.digest()

612

613

# Encrypt secret

614

iv = os.urandom(Crypto.Cipher.AES.block_size)

615

ciphereng = Crypto.Cipher.AES.new(encryptionkey,

616

Crypto.Cipher.AES.MODE_CFB, iv)

617

ciphertext = ciphereng.encrypt(validationhash+self.secret)

618

self.encrypted_secret = (ciphertext, iv)

619

620

# Decrypt a encrypted client secret

621

def decrypt_secret(self, key):

622

# Decryption-key need to be of a specific size, so we hash

623

# supplied key

624

hasheng = hashlib.sha256()

625

hasheng.update(key)

626

encryptionkey = hasheng.digest()

627

628

# Decrypt encrypted secret

629

ciphertext, iv = self.encrypted_secret

630

ciphereng = Crypto.Cipher.AES.new(encryptionkey,

631

Crypto.Cipher.AES.MODE_CFB, iv)

632

plain = ciphereng.decrypt(ciphertext)

633

634

# Validate decrypted secret to know if it was succesful

635

hasheng = hashlib.sha256()

636

validationhash = plain[:hasheng.digest_size]

637

secret = plain[hasheng.digest_size:]

638

hasheng.update(secret)

639

640

# If validation fails, we use key as new secret. Otherwise, we

641

# use the decrypted secret

642

if hasheng.digest() == validationhash:

643

self.secret = secret

644

else:

645

self.secret = key

646

del self.encrypted_secret

647

648

747

649

748

def dbus_service_property(dbus_interface, signature="v",

650

749

access="readwrite", byte_arrays=False):

662

761

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

663

762

if byte_arrays and signature != "ay":

664

763

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

665

" signature %r" % signature)

764

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

666

765

def decorator(func):

667

766

func._dbus_is_property = True

668

767

func._dbus_interface = dbus_interface

676

775

return decorator

677

776

678

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

679

815

class DBusPropertyException(dbus.exceptions.DBusException):

680

816

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

681

817

"""

704

840

"""

705

841

706

842

@staticmethod

707

def _is_dbus_property(obj):

708

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)

709

851

710

def _get_all_dbus_properties(self):

852

def _get_all_dbus_things(self, thing):

711

853

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

712

854

"""

713

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

855

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

856

name),

857

athing.__get__(self))

714

858

for cls in self.__class__.__mro__

715

for name, prop in

716

inspect.getmembers(cls, self._is_dbus_property))

859

for name, athing in

860

inspect.getmembers(cls,

861

self._is_dbus_thing(thing)))

717

862

718

863

def _get_dbus_property(self, interface_name, property_name):

719

864

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

721

866

"""

722

867

for cls in self.__class__.__mro__:

723

868

for name, value in (inspect.getmembers

724

(cls, self._is_dbus_property)):

869

(cls,

870

self._is_dbus_thing("property"))):

725

871

if (value._dbus_name == property_name

726

872

and value._dbus_interface == interface_name):

727

873

return value.__get__(self)

756

902

# signatures other than "ay".

757

903

if prop._dbus_signature != "ay":

758

904

raise ValueError

759

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

760

for byte in value))

905

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

906

for byte in value))

761

907

prop(value)

762

908

763

909

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

768

914

769

915

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

770

916

"""

771

all = {}

772

for name, prop in self._get_all_dbus_properties():

917

properties = {}

918

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

773

919

if (interface_name

774

920

and interface_name != prop._dbus_interface):

775

921

# Interface non-empty but did not match

779

925

continue

780

926

value = prop()

781

927

if not hasattr(value, "variant_level"):

782

all[name] = value

928

properties[name] = value

783

929

continue

784

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

785

value.variant_level+1)

786

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")

787

933

788

934

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

789

935

out_signature="s",

790

936

path_keyword='object_path',

791

937

connection_keyword='connection')

792

938

def Introspect(self, object_path, connection):

793

"""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.

794

942

"""

795

943

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

796

944

connection)

803

951

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

804

952

return e

805

953

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

954

# Add property tags

806

955

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

807

956

for name, prop

808

in self._get_all_dbus_properties()

957

in self._get_all_dbus_things("property")

809

958

if prop._dbus_interface

810

959

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

811

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)

812

992

# Add the names to the return values for the

813

993

# "org.freedesktop.DBus.Properties" methods

814

994

if (if_tag.getAttribute("name")

829

1009

except (AttributeError, xml.dom.DOMException,

830

1010

xml.parsers.expat.ExpatError) as error:

831

1011

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

832

error)

1012

exc_info=error)

833

1013

return xmlstring

834

1014

835

1015

840

1020

return dbus.String(dt.isoformat(),

841

1021

variant_level=variant_level)

842

1022

843

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

844

.__metaclass__):

845

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

846

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).

847

1046

"""

848

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

849

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

850

# methods, signals, or properties in them

851

for base in (b for b in bases

852

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

853

# Go though all attributes of the base class

854

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):

855

1054

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

856

1055

# with the wrong interface name

857

1056

if (not hasattr(attribute, "_dbus_interface")

858

1057

or not attribute._dbus_interface

859

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

1058

.startswith(orig_interface_name)):

860

1059

continue

861

1060

# Create an alternate D-Bus interface name based on

862

1061

# the current name

863

1062

alt_interface = (attribute._dbus_interface

864

.replace("se.recompile.Mandos",

865

"se.bsnet.fukt.Mandos"))

1063

.replace(orig_interface_name,

1064

alt_interface_name))

1065

interface_names.add(alt_interface)

866

1066

# Is this a D-Bus signal?

867

1067

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

868

1068

# Extract the original non-method function by

883

1083

nonmethod_func.func_name,

884

1084

nonmethod_func.func_defaults,

885

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

886

1092

# Define a creator of a function to call both the

887

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

888

# 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

889

1096

def fixscope(func1, func2):

890

1097

"""This function is a scope container to pass

891

1098

func1 and func2 to the "call_both" function

898

1105

return call_both

899

1106

# Create the "call_both" function and add it to

900

1107

# the class

901

attr[attrname] = fixscope(attribute,

902

new_function)

1108

attr[attrname] = fixscope(attribute, new_function)

903

1109

# Is this a D-Bus method?

904

1110

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

905

1111

# Create a new, but exactly alike, function

916

1122

attribute.func_name,

917

1123

attribute.func_defaults,

918

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

919

1131

# Is this a D-Bus property?

920

1132

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

921

1133

# Create a new, but exactly alike, function

935

1147

attribute.func_name,

936

1148

attribute.func_defaults,

937

1149

attribute.func_closure)))

938

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

939

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"})

940

1195

class ClientDBus(Client, DBusObjectWithProperties):

941

1196

"""A Client class using D-Bus

942

1197

952

1207

953

1208

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

954

1209

self.bus = bus

955

self._approvals_pending = 0

956

1210

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

957

self.add_to_dbus()

958

959

def add_to_dbus(self):

960

1211

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

961

1212

# the D-Bus

962

1213

client_object_name = unicode(self.name).translate(

966

1217

("/clients/" + client_object_name))

967

1218

DBusObjectWithProperties.__init__(self, self.bus,

968

1219

self.dbus_object_path)

969

1220

970

1221

def notifychangeproperty(transform_func,

971

1222

dbus_name, type_func=lambda x: x,

972

1223

variant_level=1):

973

1224

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

974

1225

its changes to DBus.

975

1226

976

1227

transform_fun: Function that takes a value and a variant_level

977

1228

and transforms it to a D-Bus type.

978

1229

dbus_name: D-Bus name of the variable

995

1246

996

1247

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

997

1248

998

999

1249

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1000

1250

approvals_pending = notifychangeproperty(dbus.Boolean,

1001

1251

"ApprovalPending",

1008

1258

checker is not None)

1009

1259

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1010

1260

"LastCheckedOK")

1261

last_checker_status = notifychangeproperty(dbus.Int16,

1262

"LastCheckerStatus")

1011

1263

last_approval_request = notifychangeproperty(

1012

1264

datetime_to_dbus, "LastApprovalRequest")

1013

1265

approved_by_default = notifychangeproperty(dbus.Boolean,

1014

1266

"ApprovedByDefault")

1015

approval_delay = notifychangeproperty(dbus.UInt16,

1267

approval_delay = notifychangeproperty(dbus.UInt64,

1016

1268

"ApprovalDelay",

1017

1269

type_func =

1018

_timedelta_to_milliseconds)

1270

timedelta_to_milliseconds)

1019

1271

approval_duration = notifychangeproperty(

1020

dbus.UInt16, "ApprovalDuration",

1021

type_func = _timedelta_to_milliseconds)

1272

dbus.UInt64, "ApprovalDuration",

1273

type_func = timedelta_to_milliseconds)

1022

1274

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

1023

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

1275

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

1024

1276

type_func =

1025

_timedelta_to_milliseconds)

1277

timedelta_to_milliseconds)

1026

1278

extended_timeout = notifychangeproperty(

1027

dbus.UInt16, "ExtendedTimeout",

1028

type_func = _timedelta_to_milliseconds)

1029

interval = notifychangeproperty(dbus.UInt16,

1279

dbus.UInt64, "ExtendedTimeout",

1280

type_func = timedelta_to_milliseconds)

1281

interval = notifychangeproperty(dbus.UInt64,

1030

1282

"Interval",

1031

1283

type_func =

1032

_timedelta_to_milliseconds)

1284

timedelta_to_milliseconds)

1033

1285

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

1034

1286

1035

1287

del notifychangeproperty

1077

1329

return r

1078

1330

1079

1331

def _reset_approved(self):

1080

self._approved = None

1332

self.approved = None

1081

1333

return False

1082

1334

1083

1335

def approve(self, value=True):

1084

1336

self.send_changedstate()

1085

self._approved = value

1086

gobject.timeout_add(_timedelta_to_milliseconds

1337

self.approved = value

1338

gobject.timeout_add(timedelta_to_milliseconds

1087

1339

(self.approval_duration),

1088

1340

self._reset_approved)

1089

1341

1090

1091

1342

## D-Bus methods, signals & properties

1092

1343

_interface = "se.recompile.Mandos.Client"

1093

1344

1345

## Interfaces

1346

1347

@dbus_interface_annotations(_interface)

1348

def _foo(self):

1349

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

1350

"false"}

1351

1094

1352

## Signals

1095

1353

1096

1354

# CheckerCompleted - signal

1195

1453

access="readwrite")

1196

1454

def ApprovalDuration_dbus_property(self, value=None):

1197

1455

if value is None: # get

1198

return dbus.UInt64(_timedelta_to_milliseconds(

1456

return dbus.UInt64(timedelta_to_milliseconds(

1199

1457

self.approval_duration))

1200

1458

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

1201

1459

1215

1473

def Host_dbus_property(self, value=None):

1216

1474

if value is None: # get

1217

1475

return dbus.String(self.host)

1218

self.host = value

1476

self.host = unicode(value)

1219

1477

1220

1478

# Created - property

1221

1479

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

1222

1480

def Created_dbus_property(self):

1223

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

1481

return datetime_to_dbus(self.created)

1224

1482

1225

1483

# LastEnabled - property

1226

1484

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

1247

1505

return

1248

1506

return datetime_to_dbus(self.last_checked_ok)

1249

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

1250

1514

# Expires - property

1251

1515

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

1252

1516

def Expires_dbus_property(self):

1264

1528

if value is None: # get

1265

1529

return dbus.UInt64(self.timeout_milliseconds())

1266

1530

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

1267

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

1268

return

1269

1531

# Reschedule timeout

1270

gobject.source_remove(self.disable_initiator_tag)

1271

self.disable_initiator_tag = None

1272

self.expires = None

1273

time_to_die = _timedelta_to_milliseconds((self

1274

.last_checked_ok

1275

+ self.timeout)

1276

- datetime.datetime

1277

.utcnow())

1278

if time_to_die <= 0:

1279

# The timeout has passed

1280

self.disable()

1281

else:

1282

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

1283

+ datetime.timedelta(milliseconds =

1284

time_to_die))

1285

self.disable_initiator_tag = (gobject.timeout_add

1286

(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))

1287

1550

1288

1551

# ExtendedTimeout - property

1289

1552

@dbus_service_property(_interface, signature="t",

1302

1565

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

1303

1566

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

1304

1567

return

1305

# Reschedule checker run

1306

gobject.source_remove(self.checker_initiator_tag)

1307

self.checker_initiator_tag = (gobject.timeout_add

1308

(value, self.start_checker))

1309

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

1310

1574

1311

1575

# Checker - property

1312

1576

@dbus_service_property(_interface, signature="s",

1314

1578

def Checker_dbus_property(self, value=None):

1315

1579

if value is None: # get

1316

1580

return dbus.String(self.checker_command)

1317

self.checker_command = value

1581

self.checker_command = unicode(value)

1318

1582

1319

1583

# CheckerRunning - property

1320

1584

@dbus_service_property(_interface, signature="b",

1349

1613

raise KeyError()

1350

1614

1351

1615

def __getattribute__(self, name):

1352

if(name == '_pipe'):

1616

if name == '_pipe':

1353

1617

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

1354

1618

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

1355

1619

data = self._pipe.recv()

1362

1626

return func

1363

1627

1364

1628

def __setattr__(self, name, value):

1365

if(name == '_pipe'):

1629

if name == '_pipe':

1366

1630

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

1367

1631

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

1368

1632

1369

class ClientDBusTransitional(ClientDBus):

1370

__metaclass__ = AlternateDBusNamesMetaclass

1371

1633

1372

1634

class ClientHandler(socketserver.BaseRequestHandler, object):

1373

1635

"""A class to handle client connections.

1456

1718

client.Rejected("Disabled")

1457

1719

return

1458

1720

1459

if client._approved or not client.approval_delay:

1721

if client.approved or not client.approval_delay:

1460

1722

#We are approved or approval is disabled

1461

1723

break

1462

elif client._approved is None:

1724

elif client.approved is None:

1463

1725

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

1464

1726

client.name)

1465

1727

if self.server.use_dbus:

1479

1741

time = datetime.datetime.now()

1480

1742

client.changedstate.acquire()

1481

1743

(client.changedstate.wait

1482

(float(client._timedelta_to_milliseconds(delay)

1744

(float(client.timedelta_to_milliseconds(delay)

1483

1745

/ 1000)))

1484

1746

client.changedstate.release()

1485

1747

time2 = datetime.datetime.now()

1502

1764

try:

1503

1765

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

1504

1766

except gnutls.errors.GNUTLSError as error:

1505

logger.warning("gnutls send failed")

1767

logger.warning("gnutls send failed",

1768

exc_info=error)

1506

1769

return

1507

1770

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

1508

1771

sent, len(client.secret)

1511

1774

1512

1775

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

1513

1776

# bump the timeout using extended_timeout

1514

client.checked_ok(client.extended_timeout)

1777

client.bump_timeout(client.extended_timeout)

1515

1778

if self.server.use_dbus:

1516

1779

# Emit D-Bus signal

1517

1780

client.GotSecret()

1522

1785

try:

1523

1786

session.bye()

1524

1787

except gnutls.errors.GNUTLSError as error:

1525

logger.warning("GnuTLS bye failed")

1788

logger.warning("GnuTLS bye failed",

1789

exc_info=error)

1526

1790

1527

1791

@staticmethod

1528

1792

def peer_certificate(session):

1584

1848

# Convert the buffer to a Python bytestring

1585

1849

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

1586

1850

# Convert the bytestring to hexadecimal notation

1587

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

1851

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

1588

1852

return hex_fpr

1589

1853

1590

1854

1593

1857

def sub_process_main(self, request, address):

1594

1858

try:

1595

1859

self.finish_request(request, address)

1596

except:

1860

except Exception:

1597

1861

self.handle_error(request, address)

1598

1862

self.close_request(request)

1599

1863

1840

2104

elif suffix == "w":

1841

2105

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

1842

2106

else:

1843

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

2107

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

2108

.format(suffix))

1844

2109

except (ValueError, IndexError) as e:

1845

2110

raise ValueError(*(e.args))

1846

2111

timevalue += delta

1847

2112

return timevalue

1848

2113

1849

2114

1850

def if_nametoindex(interface):

1851

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

1852

1853

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

1854

global if_nametoindex

1855

try:

1856

if_nametoindex = (ctypes.cdll.LoadLibrary

1857

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

1858

.if_nametoindex)

1859

except (OSError, AttributeError):

1860

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

1861

def if_nametoindex(interface):

1862

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

1863

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

1864

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

1865

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1866

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

1867

interface))

1868

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

1869

ifreq[16:20])[0]

1870

return interface_index

1871

return if_nametoindex(interface)

1872

1873

1874

2115

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

1875

2116

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

1876

2117

1884

2125

sys.exit()

1885

2126

if not noclose:

1886

2127

# Close all standard open file descriptors

1887

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

2128

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

1888

2129

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

1889

2130

raise OSError(errno.ENODEV,

1890

"%s not a character device"

1891

% os.path.devnull)

2131

"{0} not a character device"

2132

.format(os.devnull))

1892

2133

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

1893

2134

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

1894

2135

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

1903

2144

1904

2145

parser = argparse.ArgumentParser()

1905

2146

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

1906

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

2147

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

1907

2148

help="show version number and exit")

1908

2149

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

1909

2150

help="Bind to interface IF")

1932

2173

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

1933

2174

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

1934

2175

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

1935

dest="restore",

1936

help="Do not restore stored state",

1937

default=True)

1938

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

1939

2181

options = parser.parse_args()

1940

2182

1941

2183

if options.check:

1954

2196

"use_dbus": "True",

1955

2197

"use_ipv6": "True",

1956

2198

"debuglevel": "",

2199

"restore": "True",

2200

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

1957

2201

}

1958

2202

1959

2203

# Parse config file for server-global settings

1976

2220

# options, if set.

1977

2221

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

1978

2222

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

1979

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

2223

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

2224

"statedir"):

1980

2225

value = getattr(options, option)

1981

2226

if value is not None:

1982

2227

server_settings[option] = value

1994

2239

debuglevel = server_settings["debuglevel"]

1995

2240

use_dbus = server_settings["use_dbus"]

1996

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)

1997

2253

1998

2254

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

1999

2255

syslogger.setFormatter(logging.Formatter

2000

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

2001

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

2002

% server_settings["servicename"]))

2256

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

2257

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

2258

.format(server_settings

2259

["servicename"])))

2003

2260

2004

2261

# Parse config file with clients

2005

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

2006

"extended_timeout": "15m",

2007

"interval": "2m",

2008

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

2009

"host": "",

2010

"approval_delay": "0s",

2011

"approval_duration": "1s",

2012

}

2013

client_config = configparser.SafeConfigParser(client_defaults)

2262

client_config = configparser.SafeConfigParser(Client

2263

.client_defaults)

2014

2264

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

2015

2265

"clients.conf"))

2016

2266

2030

2280

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

2031

2281

try:

2032

2282

pidfile = open(pidfilename, "w")

2033

except IOError:

2034

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)

2035

2286

2036

try:

2037

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

2038

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

2039

except KeyError:

2287

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

2040

2288

try:

2041

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

2042

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

2289

uid = pwd.getpwnam(name).pw_uid

2290

gid = pwd.getpwnam(name).pw_gid

2291

break

2043

2292

except KeyError:

2044

try:

2045

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

2046

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

2047

except KeyError:

2048

uid = 65534

2049

gid = 65534

2293

continue

2294

else:

2295

uid = 65534

2296

gid = 65534

2050

2297

try:

2051

2298

os.setgid(gid)

2052

2299

os.setuid(uid)

2054

2301

if error[0] != errno.EPERM:

2055

2302

raise error

2056

2303

2057

if not debug and not debuglevel:

2058

logger.setLevel(logging.WARNING)

2059

if debuglevel:

2060

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

2061

logger.setLevel(level)

2062

2063

2304

if debug:

2064

logger.setLevel(logging.DEBUG)

2065

2305

# Enable all possible GnuTLS debugging

2066

2306

2067

2307

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

2076

2316

.gnutls_global_set_log_function(debug_gnutls))

2077

2317

2078

2318

# Redirect stdin so all checkers get /dev/null

2079

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

2319

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

2080

2320

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

2081

2321

if null > 2:

2082

2322

os.close(null)

2083

else:

2084

# No console logging

2085

logger.removeHandler(console)

2086

2323

2087

2324

# Need to fork before connecting to D-Bus

2088

2325

if not debug:

2089

2326

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

2090

2327

daemon()

2091

2328

2329

gobject.threads_init()

2330

2092

2331

global main_loop

2093

2332

# From the Avahi example code

2094

DBusGMainLoop(set_as_default=True )

2333

DBusGMainLoop(set_as_default=True)

2095

2334

main_loop = gobject.MainLoop()

2096

2335

bus = dbus.SystemBus()

2097

2336

# End of Avahi example code

2103

2342

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

2104

2343

do_not_queue=True))

2105

2344

except dbus.exceptions.NameExistsException as e:

2106

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

2345

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

2107

2346

use_dbus = False

2108

2347

server_settings["use_dbus"] = False

2109

2348

tcp_server.use_dbus = False

2121

2360

2122

2361

client_class = Client

2123

2362

if use_dbus:

2124

client_class = functools.partial(ClientDBusTransitional,

2125

bus = bus)

2126

2127

special_settings = {

2128

# Some settings need to be accessd by special methods;

2129

# booleans need .getboolean(), etc. Here is a list of them:

2130

"approved_by_default":

2131

lambda section:

2132

client_config.getboolean(section, "approved_by_default"),

2133

}

2134

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

2135

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

2136

# with exceptions for any special settings as defined above

2137

client_settings = dict((clientname,

2138

dict((setting,

2139

(value if

2140

setting not in special_settings

2141

else special_settings[setting]

2142

(clientname)))

2143

for setting, value

2144

in client_config.items(clientname)))

2145

for clientname in client_config.sections())

2146

2363

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

2364

2365

client_settings = Client.config_parser(client_config)

2147

2366

old_client_settings = {}

2148

clients_data = []

2149

2150

# Get client data and settings from last running state.

2367

clients_data = {}

2368

2369

# Get client data and settings from last running state.

2151

2370

if server_settings["restore"]:

2152

2371

try:

2153

2372

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

2154

clients_data, old_client_settings = (

2155

pickle.load(stored_state))

2373

clients_data, old_client_settings = (pickle.load

2374

(stored_state))

2156

2375

os.remove(stored_state_path)

2157

2376

except IOError as e:

2158

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

2159

.format(e))

2160

if e.errno != errno.ENOENT:

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)

2161

2383

raise

2162

2163

for client in clients_data:

2164

client_name = client["name"]

2165

2166

# Decide which value to use after restoring saved state.

2167

# We have three different values: Old config file,

2168

# new config file, and saved state.

2169

# New config value takes precedence if it differs from old

2170

# config value, otherwise use saved state.

2171

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

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))

2172

2434

try:

2173

# For each value in new config, check if it differs

2174

# from the old config value (Except for the "secret"

2175

# attribute)

2176

if (name != "secret" and

2177

value != old_client_settings[client_name][name]):

2178

setattr(client, name, value)

2179

except KeyError:

2180

pass

2181

2182

# Clients who has passed its expire date, can still be enabled

2183

# if its last checker was sucessful. Clients who checkers

2184

# failed before we stored it state is asumed to had failed

2185

# checker during downtime.

2186

if client["enabled"] and client["last_checked_ok"]:

2187

if ((datetime.datetime.utcnow()

2188

- client["last_checked_ok"]) > client["interval"]):

2189

if client["last_checker_status"] != 0:

2190

client["enabled"] = False

2191

else:

2192

client["expires"] = (datetime.datetime.utcnow()

2193

+ client["timeout"])

2194

2195

client["changedstate"] = (multiprocessing_manager

2196

.Condition(multiprocessing_manager

2197

.Lock()))

2198

if use_dbus:

2199

new_client = ClientDBusTransitional.__new__(

2200

ClientDBusTransitional)

2201

tcp_server.clients[client_name] = new_client

2202

new_client.bus = bus

2203

for name, value in client.iteritems():

2204

setattr(new_client, name, value)

2205

new_client._approvals_pending = 0

2206

new_client.add_to_dbus()

2207

else:

2208

tcp_server.clients[client_name] = Client.__new__(Client)

2209

for name, value in client.iteritems():

2210

setattr(tcp_server.clients[client_name], name, value)

2211

2212

tcp_server.clients[client_name].decrypt_secret(

2213

client_settings[client_name]["secret"])

2214

2215

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

2216

for clientname in set(old_client_settings) - set(client_settings):

2217

del tcp_server.clients[clientname]

2218

for clientname in set(client_settings) - set(old_client_settings):

2219

tcp_server.clients[clientname] = client_class(name

2220

= clientname,

2221

config =

2222

client_settings

2223

[clientname])

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)

2224

2458

2225

2459

if not tcp_server.clients:

2226

2460

logger.warning("No clients defined")

2227

2461

2228

2462

if not debug:

2229

2463

try:

2230

2464

with pidfile:

2238

2472

# "pidfile" was never created

2239

2473

pass

2240

2474

del pidfilename

2241

2242

2475

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

2243

2476

2244

2477

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

2245

2478

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

2246

2479

2247

2480

if use_dbus:

2248

class MandosDBusService(dbus.service.Object):

2481

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

2482

"se.bsnet.fukt.Mandos"})

2483

class MandosDBusService(DBusObjectWithProperties):

2249

2484

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

2250

2485

def __init__(self):

2251

2486

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

2252

2487

_interface = "se.recompile.Mandos"

2253

2488

2489

@dbus_interface_annotations(_interface)

2490

def _foo(self):

2491

return { "org.freedesktop.DBus.Property"

2492

".EmitsChangedSignal":

2493

"false"}

2494

2254

2495

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

2255

2496

def ClientAdded(self, objpath):

2256

2497

"D-Bus signal"

2298

2539

2299

2540

del _interface

2300

2541

2301

class MandosDBusServiceTransitional(MandosDBusService):

2302

__metaclass__ = AlternateDBusNamesMetaclass

2303

mandos_dbus_service = MandosDBusServiceTransitional()

2542

mandos_dbus_service = MandosDBusService()

2304

2543

2305

2544

def cleanup():

2306

2545

"Cleanup function; run on exit"

2309

2548

multiprocessing.active_children()

2310

2549

if not (tcp_server.clients or client_settings):

2311

2550

return

2312

2551

2313

2552

# Store client before exiting. Secrets are encrypted with key

2314

2553

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

2315

2554

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

2316

clients = []

2317

for client in tcp_server.clients.itervalues():

2318

client.encrypt_secret(

2319

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

2320

2321

client_dict = {}

2322

2323

# A list of attributes that will not be stored when

2324

# shutting down.

2325

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

2326

for name, typ in inspect.getmembers(dbus.service.Object):

2327

exclude.add(name)

2328

2329

client_dict["encrypted_secret"] = client.encrypted_secret

2330

for attr in client.client_structure:

2331

if attr not in exclude:

2332

client_dict[attr] = getattr(client, attr)

2333

2334

clients.append(client_dict)

2335

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

2336

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

2337

2580

try:

2338

with os.fdopen(os.open(stored_state_path,

2339

os.O_CREAT|os.O_WRONLY|os.O_TRUNC,

2340

stat.S_IRUSR | stat.S_IWUSR),

2341

"wb") as stored_state:

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:

2342

2586

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

2343

except IOError as e:

2344

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

2345

.format(e))

2346

if e.errno != errno.ENOENT:

2347

raise

2348

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

2349

2602

# Delete all clients, and settings from config

2350

2603

while tcp_server.clients:

2351

2604

name, client = tcp_server.clients.popitem()

2369

2622

# Need to initiate checking of clients

2370

2623

if client.enabled:

2371

2624

client.init_checker()

2372

2373

2625

2374

2626

tcp_server.enable()

2375

2627

tcp_server.server_activate()

2378

2630

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

2379

2631

if use_ipv6:

2380

2632

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

2381

" flowinfo %d, scope_id %d"

2382

% tcp_server.socket.getsockname())

2633

" flowinfo %d, scope_id %d",

2634

*tcp_server.socket.getsockname())

2383

2635

else: # IPv4

2384

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

2385

% tcp_server.socket.getsockname())

2636

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

2637

*tcp_server.socket.getsockname())

2386

2638

2387

2639

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

2388

2640

2391

2643

try:

2392

2644

service.activate()

2393

2645

except dbus.exceptions.DBusException as error:

2394

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

2646

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

2395

2647

cleanup()

2396

2648

sys.exit(1)

2397

2649

# End of Avahi example code

2404

2656

logger.debug("Starting main loop")

2405

2657

main_loop.run()

2406

2658

except AvahiError as error:

2407

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

2659

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

2408

2660

cleanup()

2409

2661

sys.exit(1)

2410

2662

except KeyboardInterrupt:

2415

2667

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

2416

2668

cleanup()

2417

2669

2418

2419

2670

if __name__ == '__main__':

2420

2671

main()