/mandos/trunk : revision 518.2.3

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import 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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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.5.3"

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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return interface_index

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

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def initlogger(level=logging.WARNING):

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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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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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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class CryptoError(Exception):

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pass

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class PGPEngine(object):

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class Crypto(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.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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'--quiet'])

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def __enter__(self):

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return self

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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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with open(os.devnull) 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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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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raise CryptoError(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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with open(os.devnull) 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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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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raise CryptoError(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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self.value = value

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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("D-Bus Exception", exc_info=error)

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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

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

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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checker, or None.

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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 secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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

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

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

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

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"extended_timeout": "15m",

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"interval": "2m",

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

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"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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return _timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return _timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return _timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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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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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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self.name = name

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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)

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else:

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self.last_enabled = None

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self.expires = None

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if config is None:

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config = {}

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

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# 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

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

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.replace(" ", ""))

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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if "secret" in config:

465

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

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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", "")

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self.created = datetime.datetime.utcnow()

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self.enabled = config.get("enabled", True)

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self.last_approval_request = None

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if self.enabled:

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self.last_enabled = datetime.datetime.utcnow()

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else:

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self.last_enabled = None

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self.last_checked_ok = None

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self.last_checker_status = None

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

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self.extended_timeout = string_to_delta(config

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["extended_timeout"])

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

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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if self.enabled:

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

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else:

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self.expires = None

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

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self.current_checker_command = None

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self.approved = None

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self._approved = None

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

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True)

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self.approvals_pending = 0

502

self.approval_delay = string_to_delta(

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config["approval_delay"])

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self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

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.Condition(multiprocessing_manager

555

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.Lock()))

575

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

576

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# Already enabled

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return

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self.send_changedstate()

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

579

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self.enabled = True

580

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

582

self.send_changedstate()

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584

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def disable(self, quiet=True):

585

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"""Disable this client."""

586

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

587

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return False

588

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if not quiet:

542

self.send_changedstate()

543

if not quiet:

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

590

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

545

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

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gobject.source_remove(self.disable_initiator_tag)

592

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self.disable_initiator_tag = None

593

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self.expires = None

594

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

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

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gobject.source_remove(self.checker_initiator_tag)

596

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self.checker_initiator_tag = None

597

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self.stop_checker()

598

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self.enabled = False

599

if not quiet:

600

self.send_changedstate()

601

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

602

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return False

603

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607

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def init_checker(self):

608

561

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

609

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# and every interval from then on.

610

if self.checker_initiator_tag is not None:

611

gobject.source_remove(self.checker_initiator_tag)

612

563

self.checker_initiator_tag = (gobject.timeout_add

613

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(self.interval_milliseconds(),

614

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self.start_checker))

615

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

616

if self.disable_initiator_tag is not None:

617

gobject.source_remove(self.disable_initiator_tag)

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567

self.disable_initiator_tag = (gobject.timeout_add

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568

(self.timeout_milliseconds(),

620

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self.disable))

626

575

self.checker_callback_tag = None

627

576

self.checker = None

628

577

if os.WIFEXITED(condition):

629

self.last_checker_status = os.WEXITSTATUS(condition)

578

self.last_checker_status = os.WEXITSTATUS(condition)

630

579

if self.last_checker_status == 0:

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580

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

632

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vars(self))

639

588

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

640

589

vars(self))

641

590

642

def checked_ok(self):

643

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

644

self.last_checked_ok = datetime.datetime.utcnow()

645

self.last_checker_status = 0

646

self.bump_timeout()

647

648

def bump_timeout(self, timeout=None):

649

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

591

def checked_ok(self, timeout=None):

592

"""Bump up the timeout for this client.

593

594

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

595

alive and well.

596

"""

650

597

if timeout is None:

651

598

timeout = self.timeout

599

self.last_checked_ok = datetime.datetime.utcnow()

652

600

if self.disable_initiator_tag is not None:

653

601

gobject.source_remove(self.disable_initiator_tag)

654

self.disable_initiator_tag = None

655

602

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

656

603

self.disable_initiator_tag = (gobject.timeout_add

657

(timedelta_to_milliseconds

604

(_timedelta_to_milliseconds

658

605

(timeout), self.disable))

659

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

660

607

667

614

If a checker already exists, leave it running and do

668

615

nothing."""

669

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

670

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

671

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

672

# would inevitably timeout, since no checker would get a

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

617

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

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

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# client would inevitably timeout, since no checker would get

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

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621

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

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622

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

676

623

# should be.

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self.current_checker_command)

691

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# Start a new checker if needed

692

639

if self.checker is None:

693

# Escape attributes for the shell

694

escaped_attrs = dict(

695

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

696

for attr in

697

self.runtime_expansions)

698

640

try:

699

command = self.checker_command % escaped_attrs

700

except TypeError as error:

701

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

702

self.checker_command, exc_info=error)

703

return True # Try again later

641

# In case checker_command has exactly one % operator

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command = self.checker_command % self.host

643

except TypeError:

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# Escape attributes for the shell

645

escaped_attrs = dict(

646

(attr,

647

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

648

errors=

649

'replace')))

650

for attr in

651

self.runtime_expansions)

652

653

try:

654

command = self.checker_command % escaped_attrs

655

except TypeError as error:

656

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

657

' %s', self.checker_command, error)

658

return True # Try again later

704

659

self.current_checker_command = command

705

660

try:

706

661

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

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667

self.checker = subprocess.Popen(command,

713

668

close_fds=True,

714

669

shell=True, cwd="/")

670

self.checker_callback_tag = (gobject.child_watch_add

671

(self.checker.pid,

672

self.checker_callback,

673

data=command))

674

# The checker may have completed before the gobject

675

# watch was added. Check for this.

676

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

677

if pid:

678

gobject.source_remove(self.checker_callback_tag)

679

self.checker_callback(pid, status, command)

715

680

except OSError as error:

716

logger.error("Failed to start subprocess",

717

exc_info=error)

718

self.checker_callback_tag = (gobject.child_watch_add

719

(self.checker.pid,

720

self.checker_callback,

721

data=command))

722

# The checker may have completed before the gobject

723

# watch was added. Check for this.

724

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

725

if pid:

726

gobject.source_remove(self.checker_callback_tag)

727

self.checker_callback(pid, status, command)

681

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

682

error)

728

683

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

729

684

return True

730

685

737

692

return

738

693

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

739

694

try:

740

self.checker.terminate()

695

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

741

696

#time.sleep(0.5)

742

697

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

743

# self.checker.kill()

698

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

744

699

except OSError as error:

745

700

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

746

701

raise

763

718

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

764

719

if byte_arrays and signature != "ay":

765

720

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

766

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

721

" signature %r" % signature)

767

722

def decorator(func):

768

723

func._dbus_is_property = True

769

724

func._dbus_interface = dbus_interface

777

732

return decorator

778

733

779

734

780

def dbus_interface_annotations(dbus_interface):

781

"""Decorator for marking functions returning interface annotations

782

783

Usage:

784

785

@dbus_interface_annotations("org.example.Interface")

786

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

787

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

788

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

789

"false"}

790

"""

791

def decorator(func):

792

func._dbus_is_interface = True

793

func._dbus_interface = dbus_interface

794

func._dbus_name = dbus_interface

795

return func

796

return decorator

797

798

799

def dbus_annotations(annotations):

800

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

801

Usage:

802

803

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

804

access="r")

805

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

806

"org.freedesktop.DBus.Property."

807

"EmitsChangedSignal": "false"})

808

def Property_dbus_property(self):

809

return dbus.Boolean(False)

810

"""

811

def decorator(func):

812

func._dbus_annotations = annotations

813

return func

814

return decorator

815

816

817

735

class DBusPropertyException(dbus.exceptions.DBusException):

818

736

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

819

737

"""

842

760

"""

843

761

844

762

@staticmethod

845

def _is_dbus_thing(thing):

846

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

847

848

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

849

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

850

"""

851

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

852

False)

763

def _is_dbus_property(obj):

764

return getattr(obj, "_dbus_is_property", False)

853

765

854

def _get_all_dbus_things(self, thing):

766

def _get_all_dbus_properties(self):

855

767

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

856

768

"""

857

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

858

name),

859

athing.__get__(self))

769

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

860

770

for cls in self.__class__.__mro__

861

for name, athing in

862

inspect.getmembers(cls,

863

self._is_dbus_thing(thing)))

771

for name, prop in

772

inspect.getmembers(cls, self._is_dbus_property))

864

773

865

774

def _get_dbus_property(self, interface_name, property_name):

866

775

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

868

777

"""

869

778

for cls in self.__class__.__mro__:

870

779

for name, value in (inspect.getmembers

871

(cls,

872

self._is_dbus_thing("property"))):

780

(cls, self._is_dbus_property)):

873

781

if (value._dbus_name == property_name

874

782

and value._dbus_interface == interface_name):

875

783

return value.__get__(self)

904

812

# signatures other than "ay".

905

813

if prop._dbus_signature != "ay":

906

814

raise ValueError

907

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

908

for byte in value))

815

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

816

for byte in value))

909

817

prop(value)

910

818

911

819

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

917

825

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

918

826

"""

919

827

properties = {}

920

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

828

for name, prop in self._get_all_dbus_properties():

921

829

if (interface_name

922

830

and interface_name != prop._dbus_interface):

923

831

# Interface non-empty but did not match

938

846

path_keyword='object_path',

939

847

connection_keyword='connection')

940

848

def Introspect(self, object_path, connection):

941

"""Overloading of standard D-Bus method.

942

943

Inserts property tags and interface annotation tags.

849

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

944

850

"""

945

851

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

946

852

connection)

953

859

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

954

860

return e

955

861

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

956

# Add property tags

957

862

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

958

863

for name, prop

959

in self._get_all_dbus_things("property")

864

in self._get_all_dbus_properties()

960

865

if prop._dbus_interface

961

866

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

962

867

if_tag.appendChild(tag)

963

# Add annotation tags

964

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

965

for tag in if_tag.getElementsByTagName(typ):

966

annots = dict()

967

for name, prop in (self.

968

_get_all_dbus_things(typ)):

969

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

970

and prop._dbus_interface

971

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

972

annots.update(getattr

973

(prop,

974

"_dbus_annotations",

975

{}))

976

for name, value in annots.iteritems():

977

ann_tag = document.createElement(

978

"annotation")

979

ann_tag.setAttribute("name", name)

980

ann_tag.setAttribute("value", value)

981

tag.appendChild(ann_tag)

982

# Add interface annotation tags

983

for annotation, value in dict(

984

itertools.chain.from_iterable(

985

annotations().iteritems()

986

for name, annotations in

987

self._get_all_dbus_things("interface")

988

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

989

)).iteritems():

990

ann_tag = document.createElement("annotation")

991

ann_tag.setAttribute("name", annotation)

992

ann_tag.setAttribute("value", value)

993

if_tag.appendChild(ann_tag)

994

868

# Add the names to the return values for the

995

869

# "org.freedesktop.DBus.Properties" methods

996

870

if (if_tag.getAttribute("name")

1011

885

except (AttributeError, xml.dom.DOMException,

1012

886

xml.parsers.expat.ExpatError) as error:

1013

887

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

1014

exc_info=error)

888

error)

1015

889

return xmlstring

1016

890

1017

891

1023

897

variant_level=variant_level)

1024

898

1025

899

1026

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1027

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

1028

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

1029

interface names according to the "alt_interface_names" mapping.

1030

Usage:

1031

1032

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

1033

"net.example.AlternateInterface"})

1034

class SampleDBusObject(dbus.service.Object):

1035

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

1036

def SampleDBusMethod():

1037

pass

1038

1039

The above "SampleDBusMethod" on "SampleDBusObject" will be

1040

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

1041

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

1042

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

1043

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

1044

1045

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

1046

(from DBusObjectWithProperties) and interfaces (from the

1047

dbus_interface_annotations decorator).

900

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

901

.__metaclass__):

902

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

903

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

1048

904

"""

1049

def wrapper(cls):

1050

for orig_interface_name, alt_interface_name in (

1051

alt_interface_names.iteritems()):

1052

attr = {}

1053

interface_names = set()

1054

# Go though all attributes of the class

1055

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

905

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

906

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

907

# methods, signals, or properties in them

908

for base in (b for b in bases

909

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

910

# Go though all attributes of the base class

911

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

1056

912

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

1057

913

# with the wrong interface name

1058

914

if (not hasattr(attribute, "_dbus_interface")

1059

915

or not attribute._dbus_interface

1060

.startswith(orig_interface_name)):

916

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

1061

917

continue

1062

918

# Create an alternate D-Bus interface name based on

1063

919

# the current name

1064

920

alt_interface = (attribute._dbus_interface

1065

.replace(orig_interface_name,

1066

alt_interface_name))

1067

interface_names.add(alt_interface)

921

.replace("se.recompile.Mandos",

922

"se.bsnet.fukt.Mandos"))

1068

923

# Is this a D-Bus signal?

1069

924

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

1070

925

# Extract the original non-method function by

1085

940

nonmethod_func.func_name,

1086

941

nonmethod_func.func_defaults,

1087

942

nonmethod_func.func_closure)))

1088

# Copy annotations, if any

1089

try:

1090

new_function._dbus_annotations = (

1091

dict(attribute._dbus_annotations))

1092

except AttributeError:

1093

pass

1094

943

# Define a creator of a function to call both the

1095

# original and alternate functions, so both the

1096

# original and alternate signals gets sent when

1097

# the function is called

944

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

945

# signals gets sent when the function is called

1098

946

def fixscope(func1, func2):

1099

947

"""This function is a scope container to pass

1100

948

func1 and func2 to the "call_both" function

1107

955

return call_both

1108

956

# Create the "call_both" function and add it to

1109

957

# the class

1110

attr[attrname] = fixscope(attribute, new_function)

958

attr[attrname] = fixscope(attribute,

959

new_function)

1111

960

# Is this a D-Bus method?

1112

961

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

1113

962

# Create a new, but exactly alike, function

1124

973

attribute.func_name,

1125

974

attribute.func_defaults,

1126

975

attribute.func_closure)))

1127

# Copy annotations, if any

1128

try:

1129

attr[attrname]._dbus_annotations = (

1130

dict(attribute._dbus_annotations))

1131

except AttributeError:

1132

pass

1133

976

# Is this a D-Bus property?

1134

977

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

1135

978

# Create a new, but exactly alike, function

1149

992

attribute.func_name,

1150

993

attribute.func_defaults,

1151

994

attribute.func_closure)))

1152

# Copy annotations, if any

1153

try:

1154

attr[attrname]._dbus_annotations = (

1155

dict(attribute._dbus_annotations))

1156

except AttributeError:

1157

pass

1158

# Is this a D-Bus interface?

1159

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

1160

# Create a new, but exactly alike, function

1161

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

1162

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

1163

# to the class.

1164

attr[attrname] = (dbus_interface_annotations

1165

(alt_interface)

1166

(types.FunctionType

1167

(attribute.func_code,

1168

attribute.func_globals,

1169

attribute.func_name,

1170

attribute.func_defaults,

1171

attribute.func_closure)))

1172

if deprecate:

1173

# Deprecate all alternate interfaces

1174

iname="_AlternateDBusNames_interface_annotation{0}"

1175

for interface_name in interface_names:

1176

@dbus_interface_annotations(interface_name)

1177

def func(self):

1178

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

1179

"true" }

1180

# Find an unused name

1181

for aname in (iname.format(i)

1182

for i in itertools.count()):

1183

if aname not in attr:

1184

attr[aname] = func

1185

break

1186

if interface_names:

1187

# Replace the class with a new subclass of it with

1188

# methods, signals, etc. as created above.

1189

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

1190

(cls,), attr)

1191

return cls

1192

return wrapper

1193

1194

1195

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

1196

"se.bsnet.fukt.Mandos"})

995

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

996

997

1197

998

class ClientDBus(Client, DBusObjectWithProperties):

1198

999

"""A Client class using D-Bus

1199

1000

1210

1011

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

1211

1012

self.bus = bus

1212

1013

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

1014

1015

self._approvals_pending = 0

1213

1016

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

1214

1017

# the D-Bus

1215

1018

client_object_name = unicode(self.name).translate(

1219

1022

("/clients/" + client_object_name))

1220

1023

DBusObjectWithProperties.__init__(self, self.bus,

1221

1024

self.dbus_object_path)

1222

1025

1223

1026

def notifychangeproperty(transform_func,

1224

1027

dbus_name, type_func=lambda x: x,

1225

1028

variant_level=1):

1248

1051

1249

1052

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

1250

1053

1054

1251

1055

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1252

1056

approvals_pending = notifychangeproperty(dbus.Boolean,

1253

1057

"ApprovalPending",

1260

1064

checker is not None)

1261

1065

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1262

1066

"LastCheckedOK")

1263

last_checker_status = notifychangeproperty(dbus.Int16,

1264

"LastCheckerStatus")

1265

1067

last_approval_request = notifychangeproperty(

1266

1068

datetime_to_dbus, "LastApprovalRequest")

1267

1069

approved_by_default = notifychangeproperty(dbus.Boolean,

1268

1070

"ApprovedByDefault")

1269

approval_delay = notifychangeproperty(dbus.UInt64,

1071

approval_delay = notifychangeproperty(dbus.UInt16,

1270

1072

"ApprovalDelay",

1271

1073

type_func =

1272

timedelta_to_milliseconds)

1074

_timedelta_to_milliseconds)

1273

1075

approval_duration = notifychangeproperty(

1274

dbus.UInt64, "ApprovalDuration",

1275

type_func = timedelta_to_milliseconds)

1076

dbus.UInt16, "ApprovalDuration",

1077

type_func = _timedelta_to_milliseconds)

1276

1078

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

1277

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

1079

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

1278

1080

type_func =

1279

timedelta_to_milliseconds)

1081

_timedelta_to_milliseconds)

1280

1082

extended_timeout = notifychangeproperty(

1281

dbus.UInt64, "ExtendedTimeout",

1282

type_func = timedelta_to_milliseconds)

1283

interval = notifychangeproperty(dbus.UInt64,

1083

dbus.UInt16, "ExtendedTimeout",

1084

type_func = _timedelta_to_milliseconds)

1085

interval = notifychangeproperty(dbus.UInt16,

1284

1086

"Interval",

1285

1087

type_func =

1286

timedelta_to_milliseconds)

1088

_timedelta_to_milliseconds)

1287

1089

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

1288

1090

1289

1091

del notifychangeproperty

1331

1133

return r

1332

1134

1333

1135

def _reset_approved(self):

1334

self.approved = None

1136

self._approved = None

1335

1137

return False

1336

1138

1337

1139

def approve(self, value=True):

1338

self.approved = value

1339

gobject.timeout_add(timedelta_to_milliseconds

1140

self.send_changedstate()

1141

self._approved = value

1142

gobject.timeout_add(_timedelta_to_milliseconds

1340

1143

(self.approval_duration),

1341

1144

self._reset_approved)

1342

self.send_changedstate()

1145

1343

1146

1344

1147

## D-Bus methods, signals & properties

1345

1148

_interface = "se.recompile.Mandos.Client"

1346

1149

1347

## Interfaces

1348

1349

@dbus_interface_annotations(_interface)

1350

def _foo(self):

1351

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

1352

"false"}

1353

1354

1150

## Signals

1355

1151

1356

1152

# CheckerCompleted - signal

1392

1188

"D-Bus signal"

1393

1189

return self.need_approval()

1394

1190

1191

# NeRwequest - signal

1192

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

1193

def NewRequest(self, ip):

1194

"""D-Bus signal

1195

Is sent after a client request a password.

1196

"""

1197

pass

1198

1395

1199

## Methods

1396

1200

1397

1201

# Approve - method

1455

1259

access="readwrite")

1456

1260

def ApprovalDuration_dbus_property(self, value=None):

1457

1261

if value is None: # get

1458

return dbus.UInt64(timedelta_to_milliseconds(

1262

return dbus.UInt64(_timedelta_to_milliseconds(

1459

1263

self.approval_duration))

1460

1264

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

1461

1265

1475

1279

def Host_dbus_property(self, value=None):

1476

1280

if value is None: # get

1477

1281

return dbus.String(self.host)

1478

self.host = unicode(value)

1282

self.host = value

1479

1283

1480

1284

# Created - property

1481

1285

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

1507

1311

return

1508

1312

return datetime_to_dbus(self.last_checked_ok)

1509

1313

1510

# LastCheckerStatus - property

1511

@dbus_service_property(_interface, signature="n",

1512

access="read")

1513

def LastCheckerStatus_dbus_property(self):

1514

return dbus.Int16(self.last_checker_status)

1515

1516

1314

# Expires - property

1517

1315

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

1518

1316

def Expires_dbus_property(self):

1529

1327

def Timeout_dbus_property(self, value=None):

1530

1328

if value is None: # get

1531

1329

return dbus.UInt64(self.timeout_milliseconds())

1532

old_timeout = self.timeout

1533

1330

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

1534

# Reschedule disabling

1535

if self.enabled:

1536

now = datetime.datetime.utcnow()

1537

self.expires += self.timeout - old_timeout

1538

if self.expires <= now:

1539

# The timeout has passed

1540

self.disable()

1541

else:

1542

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

1543

is None):

1544

return

1545

gobject.source_remove(self.disable_initiator_tag)

1546

self.disable_initiator_tag = (

1547

gobject.timeout_add(

1548

timedelta_to_milliseconds(self.expires - now),

1549

self.disable))

1331

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

1332

return

1333

# Reschedule timeout

1334

gobject.source_remove(self.disable_initiator_tag)

1335

self.disable_initiator_tag = None

1336

self.expires = None

1337

time_to_die = _timedelta_to_milliseconds((self

1338

.last_checked_ok

1339

+ self.timeout)

1340

- datetime.datetime

1341

.utcnow())

1342

if time_to_die <= 0:

1343

# The timeout has passed

1344

self.disable()

1345

else:

1346

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

1347

+ datetime.timedelta(milliseconds =

1348

time_to_die))

1349

self.disable_initiator_tag = (gobject.timeout_add

1350

(time_to_die, self.disable))

1550

1351

1551

1352

# ExtendedTimeout - property

1552

1353

@dbus_service_property(_interface, signature="t",

1578

1379

def Checker_dbus_property(self, value=None):

1579

1380

if value is None: # get

1580

1381

return dbus.String(self.checker_command)

1581

self.checker_command = unicode(value)

1382

self.checker_command = value

1582

1383

1583

1384

# CheckerRunning - property

1584

1385

@dbus_service_property(_interface, signature="b",

1613

1414

raise KeyError()

1614

1415

1615

1416

def __getattribute__(self, name):

1616

if name == '_pipe':

1417

if(name == '_pipe'):

1617

1418

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

1618

1419

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

1619

1420

data = self._pipe.recv()

1626

1427

return func

1627

1428

1628

1429

def __setattr__(self, name, value):

1629

if name == '_pipe':

1430

if(name == '_pipe'):

1630

1431

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

1631

1432

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

1632

1433

1633

1434

1435

class ClientDBusTransitional(ClientDBus):

1436

__metaclass__ = AlternateDBusNamesMetaclass

1437

1438

1634

1439

class ClientHandler(socketserver.BaseRequestHandler, object):

1635

1440

"""A class to handle client connections.

1636

1441

1697

1502

logger.warning("Bad certificate: %s", error)

1698

1503

return

1699

1504

logger.debug("Fingerprint: %s", fpr)

1505

if self.server.use_dbus:

1506

# Emit D-Bus signal

1507

client.NewRequest(str(self.client_address))

1700

1508

1701

1509

try:

1702

1510

client = ProxyClient(child_pipe, fpr,

1718

1526

client.Rejected("Disabled")

1719

1527

return

1720

1528

1721

if client.approved or not client.approval_delay:

1529

if client._approved or not client.approval_delay:

1722

1530

#We are approved or approval is disabled

1723

1531

break

1724

elif client.approved is None:

1532

elif client._approved is None:

1725

1533

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

1726

1534

client.name)

1727

1535

if self.server.use_dbus:

1740

1548

#wait until timeout or approved

1741

1549

time = datetime.datetime.now()

1742

1550

client.changedstate.acquire()

1743

client.changedstate.wait(

1744

float(timedelta_to_milliseconds(delay)

1745

/ 1000))

1551

(client.changedstate.wait

1552

(float(client._timedelta_to_milliseconds(delay)

1553

/ 1000)))

1746

1554

client.changedstate.release()

1747

1555

time2 = datetime.datetime.now()

1748

1556

if (time2 - time) >= delay:

1764

1572

try:

1765

1573

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

1766

1574

except gnutls.errors.GNUTLSError as error:

1767

logger.warning("gnutls send failed",

1768

exc_info=error)

1575

logger.warning("gnutls send failed")

1769

1576

return

1770

1577

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

1771

1578

sent, len(client.secret)

1774

1581

1775

1582

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

1776

1583

# bump the timeout using extended_timeout

1777

client.bump_timeout(client.extended_timeout)

1584

client.checked_ok(client.extended_timeout)

1778

1585

if self.server.use_dbus:

1779

1586

# Emit D-Bus signal

1780

1587

client.GotSecret()

1785

1592

try:

1786

1593

session.bye()

1787

1594

except gnutls.errors.GNUTLSError as error:

1788

logger.warning("GnuTLS bye failed",

1789

exc_info=error)

1595

logger.warning("GnuTLS bye failed")

1790

1596

1791

1597

@staticmethod

1792

1598

def peer_certificate(session):

1857

1663

def sub_process_main(self, request, address):

1858

1664

try:

1859

1665

self.finish_request(request, address)

1860

except Exception:

1666

except:

1861

1667

self.handle_error(request, address)

1862

1668

self.close_request(request)

1863

1669

1864

1670

def process_request(self, request, address):

1865

1671

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

1866

1672

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

1867

args = (request, address))

1673

args = (request,

1674

address))

1868

1675

proc.start()

1869

1676

return proc

1870

1677

1920

1727

str(self.interface

1921

1728

+ '\0'))

1922

1729

except socket.error as error:

1923

if error.errno == errno.EPERM:

1730

if error[0] == errno.EPERM:

1924

1731

logger.error("No permission to"

1925

1732

" bind to interface %s",

1926

1733

self.interface)

1927

elif error.errno == errno.ENOPROTOOPT:

1734

elif error[0] == errno.ENOPROTOOPT:

1928

1735

logger.error("SO_BINDTODEVICE not available;"

1929

1736

" cannot bind to interface %s",

1930

1737

self.interface)

1931

elif error.errno == errno.ENODEV:

1932

logger.error("Interface %s does not"

1933

" exist, cannot bind",

1934

self.interface)

1935

1738

else:

1936

1739

raise

1937

1740

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

1996

1799

1997

1800

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

1998

1801

proc = None, client_object=None):

1802

condition_names = {

1803

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

1804

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

1805

# blocking).

1806

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

1807

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

1808

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

1809

# broken, usually for pipes and

1810

# sockets).

1811

}

1812

conditions_string = ' | '.join(name

1813

for cond, name in

1814

condition_names.iteritems()

1815

if cond & condition)

1999

1816

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

2000

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

1817

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

2001

1818

# Wait for other process to exit

2002

1819

proc.join()

2003

1820

return False

2093

1910

elif suffix == "w":

2094

1911

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

2095

1912

else:

2096

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

2097

.format(suffix))

1913

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

2098

1914

except (ValueError, IndexError) as e:

2099

1915

raise ValueError(*(e.args))

2100

1916

timevalue += delta

2114

1930

sys.exit()

2115

1931

if not noclose:

2116

1932

# Close all standard open file descriptors

2117

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

1933

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

2118

1934

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

2119

1935

raise OSError(errno.ENODEV,

2120

"{0} not a character device"

2121

.format(os.devnull))

1936

"%s not a character device"

1937

% os.path.devnull)

2122

1938

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

2123

1939

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

2124

1940

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

2133

1949

2134

1950

parser = argparse.ArgumentParser()

2135

1951

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

2136

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

1952

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

2137

1953

help="show version number and exit")

2138

1954

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

2139

1955

help="Bind to interface IF")

2232

2048

stored_state_file)

2233

2049

2234

2050

if debug:

2235

initlogger(debug, logging.DEBUG)

2051

initlogger(logging.DEBUG)

2236

2052

else:

2237

2053

if not debuglevel:

2238

initlogger(debug)

2054

initlogger()

2239

2055

else:

2240

2056

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

2241

initlogger(debug, level)

2057

initlogger(level)

2242

2058

2243

2059

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

2244

2060

syslogger.setFormatter(logging.Formatter

2245

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

2246

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

2247

.format(server_settings

2248

["servicename"])))

2061

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

2062

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

2063

% server_settings["servicename"]))

2249

2064

2250

2065

# Parse config file with clients

2251

client_config = configparser.SafeConfigParser(Client

2252

.client_defaults)

2066

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

2067

"extended_timeout": "15m",

2068

"interval": "2m",

2069

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

2070

"host": "",

2071

"approval_delay": "0s",

2072

"approval_duration": "1s",

2073

}

2074

client_config = configparser.SafeConfigParser(client_defaults)

2253

2075

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

2254

2076

"clients.conf"))

2255

2077

2269

2091

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

2270

2092

try:

2271

2093

pidfile = open(pidfilename, "w")

2272

except IOError as e:

2273

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

2274

exc_info=e)

2094

except IOError:

2095

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

2275

2096

2276

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

2097

try:

2098

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

2099

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

2100

except KeyError:

2277

2101

try:

2278

uid = pwd.getpwnam(name).pw_uid

2279

gid = pwd.getpwnam(name).pw_gid

2280

break

2102

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

2103

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

2281

2104

except KeyError:

2282

continue

2283

else:

2284

uid = 65534

2285

gid = 65534

2105

try:

2106

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

2107

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

2108

except KeyError:

2109

uid = 65534

2110

gid = 65534

2286

2111

try:

2287

2112

os.setgid(gid)

2288

2113

os.setuid(uid)

2289

2114

except OSError as error:

2290

if error.errno != errno.EPERM:

2115

if error[0] != errno.EPERM:

2291

2116

raise error

2292

2117

2293

2118

if debug:

2305

2130

.gnutls_global_set_log_function(debug_gnutls))

2306

2131

2307

2132

# Redirect stdin so all checkers get /dev/null

2308

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

2133

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

2309

2134

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

2310

2135

if null > 2:

2311

2136

os.close(null)

2137

else:

2138

# No console logging

2139

logger.removeHandler(console)

2312

2140

2313

2141

# Need to fork before connecting to D-Bus

2314

2142

if not debug:

2315

2143

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

2316

2144

daemon()

2317

2145

2318

gobject.threads_init()

2319

2320

2146

global main_loop

2321

2147

# From the Avahi example code

2322

DBusGMainLoop(set_as_default=True)

2148

DBusGMainLoop(set_as_default=True )

2323

2149

main_loop = gobject.MainLoop()

2324

2150

bus = dbus.SystemBus()

2325

2151

# End of Avahi example code

2331

2157

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

2332

2158

do_not_queue=True))

2333

2159

except dbus.exceptions.NameExistsException as e:

2334

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

2160

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

2335

2161

use_dbus = False

2336

2162

server_settings["use_dbus"] = False

2337

2163

tcp_server.use_dbus = False

2349

2175

2350

2176

client_class = Client

2351

2177

if use_dbus:

2352

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

2353

2354

client_settings = Client.config_parser(client_config)

2178

client_class = functools.partial(ClientDBusTransitional,

2179

bus = bus)

2180

2181

special_settings = {

2182

# Some settings need to be accessd by special methods;

2183

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

2184

"approved_by_default":

2185

lambda section:

2186

client_config.getboolean(section, "approved_by_default"),

2187

"enabled":

2188

lambda section:

2189

client_config.getboolean(section, "enabled"),

2190

}

2191

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

2192

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

2193

# with exceptions for any special settings as defined above

2194

client_settings = dict((clientname,

2195

dict((setting,

2196

(value

2197

if setting not in special_settings

2198

else special_settings[setting]

2199

(clientname)))

2200

for setting, value in

2201

client_config.items(clientname)))

2202

for clientname in client_config.sections())

2203

2355

2204

old_client_settings = {}

2356

clients_data = {}

2205

clients_data = []

2357

2206

2358

2207

# Get client data and settings from last running state.

2359

2208

if server_settings["restore"]:

2363

2212

(stored_state))

2364

2213

os.remove(stored_state_path)

2365

2214

except IOError as e:

2366

if e.errno == errno.ENOENT:

2367

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

2368

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

2369

else:

2370

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

2371

exc_info=e)

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2372

2218

raise

2373

except EOFError as e:

2374

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

2375

"EOFError:", exc_info=e)

2376

2219

2377

with PGPEngine() as pgp:

2378

for client_name, client in clients_data.iteritems():

2220

with Crypto() as crypt:

2221

for client in clients_data:

2222

client_name = client["name"]

2223

2379

2224

# Decide which value to use after restoring saved state.

2380

2225

# We have three different values: Old config file,

2381

2226

# new config file, and saved state.

2389

2234

if (name != "secret" and

2390

2235

value != old_client_settings[client_name]

2391

2236

[name]):

2392

client[name] = value

2237

setattr(client, name, value)

2393

2238

except KeyError:

2394

2239

pass

2395

2240

2396

2241

# Clients who has passed its expire date can still be

2397

# enabled if its last checker was successful. Clients

2398

# whose checker succeeded before we stored its state is

2399

# assumed to have successfully run all checkers during

2400

# downtime.

2401

if client["enabled"]:

2402

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

2403

if not client["last_checked_ok"]:

2404

logger.warning(

2405

"disabling client {0} - Client never "

2406

"performed a successful checker"

2407

.format(client_name))

2408

client["enabled"] = False

2409

elif client["last_checker_status"] != 0:

2410

logger.warning(

2411

"disabling client {0} - Client "

2412

"last checker failed with error code {1}"

2413

.format(client_name,

2414

client["last_checker_status"]))

2242

# enabled if its last checker was sucessful. Clients

2243

# whose checker failed before we stored its state is

2244

# assumed to have failed all checkers during downtime.

2245

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

2246

if ((datetime.datetime.utcnow()

2247

- client["last_checked_ok"])

2248

> client["interval"]):

2249

if client["last_checker_status"] != 0:

2415

2250

client["enabled"] = False

2416

2251

else:

2417

2252

client["expires"] = (datetime.datetime

2418

2253

.utcnow()

2419

2254

+ client["timeout"])

2420

logger.debug("Last checker succeeded,"

2421

" keeping {0} enabled"

2422

.format(client_name))

2255

2256

client["changedstate"] = (multiprocessing_manager

2257

.Condition

2258

(multiprocessing_manager

2259

.Lock()))

2260

if use_dbus:

2261

new_client = (ClientDBusTransitional.__new__

2262

(ClientDBusTransitional))

2263

tcp_server.clients[client_name] = new_client

2264

new_client.bus = bus

2265

for name, value in client.iteritems():

2266

setattr(new_client, name, value)

2267

client_object_name = unicode(client_name).translate(

2268

{ord("."): ord("_"),

2269

ord("-"): ord("_")})

2270

new_client.dbus_object_path = (dbus.ObjectPath

2271

("/clients/"

2272

+ client_object_name))

2273

DBusObjectWithProperties.__init__(new_client,

2274

new_client.bus,

2275

new_client

2276

.dbus_object_path)

2277

else:

2278

tcp_server.clients[client_name] = (Client.__new__

2279

(Client))

2280

for name, value in client.iteritems():

2281

setattr(tcp_server.clients[client_name],

2282

name, value)

2283

2423

2284

try:

2424

client["secret"] = (

2425

pgp.decrypt(client["encrypted_secret"],

2426

client_settings[client_name]

2427

["secret"]))

2428

except PGPError:

2285

tcp_server.clients[client_name].secret = (

2286

crypt.decrypt(tcp_server.clients[client_name]

2287

.encrypted_secret,

2288

client_settings[client_name]

2289

["secret"]))

2290

except CryptoError:

2429

2291

# If decryption fails, we use secret from new settings

2430

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

2431

.format(client_name))

2432

client["secret"] = (

2292

tcp_server.clients[client_name].secret = (

2433

2293

client_settings[client_name]["secret"])

2434

2294

2435

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

2436

for client_name in (set(old_client_settings)

2437

- set(client_settings)):

2438

del clients_data[client_name]

2439

for client_name in (set(client_settings)

2440

- set(old_client_settings)):

2441

clients_data[client_name] = client_settings[client_name]

2442

2443

# Create all client objects

2444

for client_name, client in clients_data.iteritems():

2445

tcp_server.clients[client_name] = client_class(

2446

name = client_name, settings = client)

2295

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

2296

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

2297

del tcp_server.clients[clientname]

2298

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

2299

tcp_server.clients[clientname] = (client_class(name

2300

= clientname,

2301

config =

2302

client_settings

2303

[clientname]))

2447

2304

2448

2305

if not tcp_server.clients:

2449

2306

logger.warning("No clients defined")

2450

2307

2451

2308

if not debug:

2452

2309

try:

2453

2310

with pidfile:

2461

2318

# "pidfile" was never created

2462

2319

pass

2463

2320

del pidfilename

2321

2464

2322

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

2465

2323

2466

2324

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

2467

2325

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

2468

2326

2469

2327

if use_dbus:

2470

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

2471

"se.bsnet.fukt.Mandos"})

2472

class MandosDBusService(DBusObjectWithProperties):

2328

class MandosDBusService(dbus.service.Object):

2473

2329

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

2474

2330

def __init__(self):

2475

2331

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

2476

2332

_interface = "se.recompile.Mandos"

2477

2333

2478

@dbus_interface_annotations(_interface)

2479

def _foo(self):

2480

return { "org.freedesktop.DBus.Property"

2481

".EmitsChangedSignal":

2482

"false"}

2483

2484

2334

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

2485

2335

def ClientAdded(self, objpath):

2486

2336

"D-Bus signal"

2528

2378

2529

2379

del _interface

2530

2380

2531

mandos_dbus_service = MandosDBusService()

2381

class MandosDBusServiceTransitional(MandosDBusService):

2382

__metaclass__ = AlternateDBusNamesMetaclass

2383

mandos_dbus_service = MandosDBusServiceTransitional()

2532

2384

2533

2385

def cleanup():

2534

2386

"Cleanup function; run on exit"

2541

2393

# Store client before exiting. Secrets are encrypted with key

2542

2394

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

2543

2395

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

2544

clients = {}

2545

with PGPEngine() as pgp:

2396

clients = []

2397

with Crypto() as crypt:

2546

2398

for client in tcp_server.clients.itervalues():

2547

2399

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

2548

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

2549

key)

2400

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

2401

key)

2550

2402

client_dict = {}

2551

2403

2552

# A list of attributes that can not be pickled

2553

# + secret.

2554

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

2555

"checker"))

2404

# A list of attributes that will not be stored when

2405

# shutting down.

2406

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

2556

2407

for name, typ in (inspect.getmembers

2557

2408

(dbus.service.Object)):

2558

2409

exclude.add(name)

2563

2414

if attr not in exclude:

2564

2415

client_dict[attr] = getattr(client, attr)

2565

2416

2566

clients[client.name] = client_dict

2417

clients.append(client_dict)

2567

2418

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

2568

2419

2569

2420

try:

2570

with (tempfile.NamedTemporaryFile

2571

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

2572

dir=os.path.dirname(stored_state_path),

2573

delete=False)) as stored_state:

2421

with os.fdopen(os.open(stored_state_path,

2422

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

2423

0600), "wb") as stored_state:

2574

2424

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

2575

tempname=stored_state.name

2576

os.rename(tempname, stored_state_path)

2577

2425

except (IOError, OSError) as e:

2578

if not debug:

2579

try:

2580

os.remove(tempname)

2581

except NameError:

2582

pass

2583

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

2584

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

2585

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

2586

else:

2587

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

2588

exc_info=e)

2589

raise e

2426

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

2427

.format(e))

2428

if e.errno not in (errno.ENOENT, errno.EACCES):

2429

raise

2590

2430

2591

2431

# Delete all clients, and settings from config

2592

2432

while tcp_server.clients:

2619

2459

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

2620

2460

if use_ipv6:

2621

2461

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

2622

" flowinfo %d, scope_id %d",

2623

*tcp_server.socket.getsockname())

2462

" flowinfo %d, scope_id %d"

2463

% tcp_server.socket.getsockname())

2624

2464

else: # IPv4

2625

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

2626

*tcp_server.socket.getsockname())

2465

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

2466

% tcp_server.socket.getsockname())

2627

2467

2628

2468

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

2629

2469

2632

2472

try:

2633

2473

service.activate()

2634

2474

except dbus.exceptions.DBusException as error:

2635

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

2475

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

2636

2476

cleanup()

2637

2477

sys.exit(1)

2638

2478

# End of Avahi example code

2645

2485

logger.debug("Starting main loop")

2646

2486

main_loop.run()

2647

2487

except AvahiError as error:

2648

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

2488

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

2649

2489

cleanup()

2650

2490

sys.exit(1)

2651

2491

except KeyboardInterrupt:

2656

2496

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

2657

2497

cleanup()

2658

2498

2499

2659

2500

if __name__ == '__main__':

2660

2501

main()