/mandos/release : revision 237.14.1

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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 = "1.5.5"

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stored_state_file = "clients.pickle"

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version = "1.4.1"

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

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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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 __exit__(self, exc_type, exc_value, traceback):

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

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checker, or None.

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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"created", "enabled", "expires",

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"fingerprint", "host", "interval",

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"last_approval_request", "last_checked_ok",

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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:

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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 = True

477

self.last_approval_request = None

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self.last_enabled = datetime.datetime.utcnow()

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

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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

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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

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.Lock()))

576

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

577

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# Already enabled

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return

525

self.send_changedstate()

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

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self.enabled = True

581

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

583

self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

587

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

588

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return False

589

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if not quiet:

536

self.send_changedstate()

537

if not quiet:

590

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

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

539

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

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gobject.source_remove(self.disable_initiator_tag)

593

541

self.disable_initiator_tag = None

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542

self.expires = None

595

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

543

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

596

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gobject.source_remove(self.checker_initiator_tag)

597

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self.checker_initiator_tag = None

598

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self.stop_checker()

599

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self.enabled = False

600

if not quiet:

601

self.send_changedstate()

602

548

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

603

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return False

604

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608

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def init_checker(self):

609

555

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

610

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# and every interval from then on.

611

if self.checker_initiator_tag is not None:

612

gobject.source_remove(self.checker_initiator_tag)

613

557

self.checker_initiator_tag = (gobject.timeout_add

614

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(self.interval_milliseconds(),

615

559

self.start_checker))

616

560

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

617

if self.disable_initiator_tag is not None:

618

gobject.source_remove(self.disable_initiator_tag)

619

561

self.disable_initiator_tag = (gobject.timeout_add

620

562

(self.timeout_milliseconds(),

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563

self.disable))

627

569

self.checker_callback_tag = None

628

570

self.checker = None

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571

if os.WIFEXITED(condition):

630

self.last_checker_status = os.WEXITSTATUS(condition)

572

self.last_checker_status = os.WEXITSTATUS(condition)

631

573

if self.last_checker_status == 0:

632

574

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

633

575

vars(self))

640

582

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

641

583

vars(self))

642

584

643

def checked_ok(self):

644

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

645

self.last_checked_ok = datetime.datetime.utcnow()

646

self.last_checker_status = 0

647

self.bump_timeout()

648

649

def bump_timeout(self, timeout=None):

650

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

585

def checked_ok(self, timeout=None):

586

"""Bump up the timeout for this client.

587

588

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

589

alive and well.

590

"""

651

591

if timeout is None:

652

592

timeout = self.timeout

593

self.last_checked_ok = datetime.datetime.utcnow()

653

594

if self.disable_initiator_tag is not None:

654

595

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

656

596

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

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self.disable_initiator_tag = (gobject.timeout_add

658

(timedelta_to_milliseconds

598

(_timedelta_to_milliseconds

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(timeout), self.disable))

660

600

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

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601

668

608

If a checker already exists, leave it running and do

669

609

nothing."""

670

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

671

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

672

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

673

# would inevitably timeout, since no checker would get a

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

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

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

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# should be.

691

631

self.current_checker_command)

692

632

# Start a new checker if needed

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633

if self.checker is None:

694

# Escape attributes for the shell

695

escaped_attrs = dict(

696

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

697

for attr in

698

self.runtime_expansions)

699

634

try:

700

command = self.checker_command % escaped_attrs

701

except TypeError as error:

702

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

703

self.checker_command, exc_info=error)

704

return True # Try again later

635

# In case checker_command has exactly one % operator

636

command = self.checker_command % self.host

637

except TypeError:

638

# Escape attributes for the shell

639

escaped_attrs = dict(

640

(attr,

641

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

642

errors=

643

'replace')))

644

for attr in

645

self.runtime_expansions)

646

647

try:

648

command = self.checker_command % escaped_attrs

649

except TypeError as error:

650

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

651

' %s', self.checker_command, error)

652

return True # Try again later

705

653

self.current_checker_command = command

706

654

try:

707

655

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

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661

self.checker = subprocess.Popen(command,

714

662

close_fds=True,

715

663

shell=True, cwd="/")

664

self.checker_callback_tag = (gobject.child_watch_add

665

(self.checker.pid,

666

self.checker_callback,

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data=command))

668

# The checker may have completed before the gobject

669

# watch was added. Check for this.

670

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

671

if pid:

672

gobject.source_remove(self.checker_callback_tag)

673

self.checker_callback(pid, status, command)

716

674

except OSError as error:

717

logger.error("Failed to start subprocess",

718

exc_info=error)

719

self.checker_callback_tag = (gobject.child_watch_add

720

(self.checker.pid,

721

self.checker_callback,

722

data=command))

723

# The checker may have completed before the gobject

724

# watch was added. Check for this.

725

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

726

if pid:

727

gobject.source_remove(self.checker_callback_tag)

728

self.checker_callback(pid, status, command)

675

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

676

error)

729

677

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

730

678

return True

731

679

738

686

return

739

687

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

740

688

try:

741

self.checker.terminate()

689

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

742

690

#time.sleep(0.5)

743

691

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

744

# self.checker.kill()

692

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

745

693

except OSError as error:

746

694

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

747

695

raise

764

712

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

765

713

if byte_arrays and signature != "ay":

766

714

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

767

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

715

" signature %r" % signature)

768

716

def decorator(func):

769

717

func._dbus_is_property = True

770

718

func._dbus_interface = dbus_interface

778

726

return decorator

779

727

780

728

781

def dbus_interface_annotations(dbus_interface):

782

"""Decorator for marking functions returning interface annotations

783

784

Usage:

785

786

@dbus_interface_annotations("org.example.Interface")

787

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

788

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

789

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

790

"false"}

791

"""

792

def decorator(func):

793

func._dbus_is_interface = True

794

func._dbus_interface = dbus_interface

795

func._dbus_name = dbus_interface

796

return func

797

return decorator

798

799

800

def dbus_annotations(annotations):

801

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

802

Usage:

803

804

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

805

access="r")

806

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

807

"org.freedesktop.DBus.Property."

808

"EmitsChangedSignal": "false"})

809

def Property_dbus_property(self):

810

return dbus.Boolean(False)

811

"""

812

def decorator(func):

813

func._dbus_annotations = annotations

814

return func

815

return decorator

816

817

818

729

class DBusPropertyException(dbus.exceptions.DBusException):

819

730

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

820

731

"""

843

754

"""

844

755

845

756

@staticmethod

846

def _is_dbus_thing(thing):

847

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

848

849

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

850

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

851

"""

852

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

853

False)

757

def _is_dbus_property(obj):

758

return getattr(obj, "_dbus_is_property", False)

854

759

855

def _get_all_dbus_things(self, thing):

760

def _get_all_dbus_properties(self):

856

761

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

857

762

"""

858

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

859

name),

860

athing.__get__(self))

763

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

861

764

for cls in self.__class__.__mro__

862

for name, athing in

863

inspect.getmembers(cls,

864

self._is_dbus_thing(thing)))

765

for name, prop in

766

inspect.getmembers(cls, self._is_dbus_property))

865

767

866

768

def _get_dbus_property(self, interface_name, property_name):

867

769

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

869

771

"""

870

772

for cls in self.__class__.__mro__:

871

773

for name, value in (inspect.getmembers

872

(cls,

873

self._is_dbus_thing("property"))):

774

(cls, self._is_dbus_property)):

874

775

if (value._dbus_name == property_name

875

776

and value._dbus_interface == interface_name):

876

777

return value.__get__(self)

905

806

# signatures other than "ay".

906

807

if prop._dbus_signature != "ay":

907

808

raise ValueError

908

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

909

for byte in value))

809

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

810

for byte in value))

910

811

prop(value)

911

812

912

813

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

918

819

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

919

820

"""

920

821

properties = {}

921

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

822

for name, prop in self._get_all_dbus_properties():

922

823

if (interface_name

923

824

and interface_name != prop._dbus_interface):

924

825

# Interface non-empty but did not match

939

840

path_keyword='object_path',

940

841

connection_keyword='connection')

941

842

def Introspect(self, object_path, connection):

942

"""Overloading of standard D-Bus method.

943

944

Inserts property tags and interface annotation tags.

843

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

945

844

"""

946

845

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

947

846

connection)

954

853

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

955

854

return e

956

855

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

957

# Add property tags

958

856

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

959

857

for name, prop

960

in self._get_all_dbus_things("property")

858

in self._get_all_dbus_properties()

961

859

if prop._dbus_interface

962

860

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

963

861

if_tag.appendChild(tag)

964

# Add annotation tags

965

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

966

for tag in if_tag.getElementsByTagName(typ):

967

annots = dict()

968

for name, prop in (self.

969

_get_all_dbus_things(typ)):

970

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

971

and prop._dbus_interface

972

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

973

annots.update(getattr

974

(prop,

975

"_dbus_annotations",

976

{}))

977

for name, value in annots.iteritems():

978

ann_tag = document.createElement(

979

"annotation")

980

ann_tag.setAttribute("name", name)

981

ann_tag.setAttribute("value", value)

982

tag.appendChild(ann_tag)

983

# Add interface annotation tags

984

for annotation, value in dict(

985

itertools.chain.from_iterable(

986

annotations().iteritems()

987

for name, annotations in

988

self._get_all_dbus_things("interface")

989

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

990

)).iteritems():

991

ann_tag = document.createElement("annotation")

992

ann_tag.setAttribute("name", annotation)

993

ann_tag.setAttribute("value", value)

994

if_tag.appendChild(ann_tag)

995

862

# Add the names to the return values for the

996

863

# "org.freedesktop.DBus.Properties" methods

997

864

if (if_tag.getAttribute("name")

1012

879

except (AttributeError, xml.dom.DOMException,

1013

880

xml.parsers.expat.ExpatError) as error:

1014

881

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

1015

exc_info=error)

882

error)

1016

883

return xmlstring

1017

884

1018

885

1019

def datetime_to_dbus(dt, variant_level=0):

886

def datetime_to_dbus (dt, variant_level=0):

1020

887

"""Convert a UTC datetime.datetime() to a D-Bus type."""

1021

888

if dt is None:

1022

889

return dbus.String("", variant_level = variant_level)

1024

891

variant_level=variant_level)

1025

892

1026

893

1027

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1028

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

1029

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

1030

interface names according to the "alt_interface_names" mapping.

1031

Usage:

1032

1033

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

1034

"net.example.AlternateInterface"})

1035

class SampleDBusObject(dbus.service.Object):

1036

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

1037

def SampleDBusMethod():

1038

pass

1039

1040

The above "SampleDBusMethod" on "SampleDBusObject" will be

1041

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

1042

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

1043

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

1044

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

1045

1046

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

1047

(from DBusObjectWithProperties) and interfaces (from the

1048

dbus_interface_annotations decorator).

894

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

895

.__metaclass__):

896

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

897

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

1049

898

"""

1050

def wrapper(cls):

1051

for orig_interface_name, alt_interface_name in (

1052

alt_interface_names.iteritems()):

1053

attr = {}

1054

interface_names = set()

1055

# Go though all attributes of the class

1056

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

899

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

900

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

901

# methods, signals, or properties in them

902

for base in (b for b in bases

903

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

904

# Go though all attributes of the base class

905

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

1057

906

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

1058

907

# with the wrong interface name

1059

908

if (not hasattr(attribute, "_dbus_interface")

1060

909

or not attribute._dbus_interface

1061

.startswith(orig_interface_name)):

910

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

1062

911

continue

1063

912

# Create an alternate D-Bus interface name based on

1064

913

# the current name

1065

914

alt_interface = (attribute._dbus_interface

1066

.replace(orig_interface_name,

1067

alt_interface_name))

1068

interface_names.add(alt_interface)

915

.replace("se.recompile.Mandos",

916

"se.bsnet.fukt.Mandos"))

1069

917

# Is this a D-Bus signal?

1070

918

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

1071

919

# Extract the original non-method function by

1086

934

nonmethod_func.func_name,

1087

935

nonmethod_func.func_defaults,

1088

936

nonmethod_func.func_closure)))

1089

# Copy annotations, if any

1090

try:

1091

new_function._dbus_annotations = (

1092

dict(attribute._dbus_annotations))

1093

except AttributeError:

1094

pass

1095

937

# Define a creator of a function to call both the

1096

# original and alternate functions, so both the

1097

# original and alternate signals gets sent when

1098

# the function is called

938

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

939

# signals gets sent when the function is called

1099

940

def fixscope(func1, func2):

1100

941

"""This function is a scope container to pass

1101

942

func1 and func2 to the "call_both" function

1108

949

return call_both

1109

950

# Create the "call_both" function and add it to

1110

951

# the class

1111

attr[attrname] = fixscope(attribute, new_function)

952

attr[attrname] = fixscope(attribute,

953

new_function)

1112

954

# Is this a D-Bus method?

1113

955

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

1114

956

# Create a new, but exactly alike, function

1125

967

attribute.func_name,

1126

968

attribute.func_defaults,

1127

969

attribute.func_closure)))

1128

# Copy annotations, if any

1129

try:

1130

attr[attrname]._dbus_annotations = (

1131

dict(attribute._dbus_annotations))

1132

except AttributeError:

1133

pass

1134

970

# Is this a D-Bus property?

1135

971

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

1136

972

# Create a new, but exactly alike, function

1150

986

attribute.func_name,

1151

987

attribute.func_defaults,

1152

988

attribute.func_closure)))

1153

# Copy annotations, if any

1154

try:

1155

attr[attrname]._dbus_annotations = (

1156

dict(attribute._dbus_annotations))

1157

except AttributeError:

1158

pass

1159

# Is this a D-Bus interface?

1160

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

1161

# Create a new, but exactly alike, function

1162

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

1163

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

1164

# to the class.

1165

attr[attrname] = (dbus_interface_annotations

1166

(alt_interface)

1167

(types.FunctionType

1168

(attribute.func_code,

1169

attribute.func_globals,

1170

attribute.func_name,

1171

attribute.func_defaults,

1172

attribute.func_closure)))

1173

if deprecate:

1174

# Deprecate all alternate interfaces

1175

iname="_AlternateDBusNames_interface_annotation{0}"

1176

for interface_name in interface_names:

1177

@dbus_interface_annotations(interface_name)

1178

def func(self):

1179

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

1180

"true" }

1181

# Find an unused name

1182

for aname in (iname.format(i)

1183

for i in itertools.count()):

1184

if aname not in attr:

1185

attr[aname] = func

1186

break

1187

if interface_names:

1188

# Replace the class with a new subclass of it with

1189

# methods, signals, etc. as created above.

1190

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

1191

(cls,), attr)

1192

return cls

1193

return wrapper

1194

1195

1196

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

1197

"se.bsnet.fukt.Mandos"})

989

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

990

991

1198

992

class ClientDBus(Client, DBusObjectWithProperties):

1199

993

"""A Client class using D-Bus

1200

994

1211

1005

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

1212

1006

self.bus = bus

1213

1007

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

1008

1009

self._approvals_pending = 0

1214

1010

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

1215

1011

# the D-Bus

1216

1012

client_object_name = unicode(self.name).translate(

1220

1016

("/clients/" + client_object_name))

1221

1017

DBusObjectWithProperties.__init__(self, self.bus,

1222

1018

self.dbus_object_path)

1223

1019

1224

1020

def notifychangeproperty(transform_func,

1225

1021

dbus_name, type_func=lambda x: x,

1226

1022

variant_level=1):

1249

1045

1250

1046

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

1251

1047

1048

1252

1049

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1253

1050

approvals_pending = notifychangeproperty(dbus.Boolean,

1254

1051

"ApprovalPending",

1261

1058

checker is not None)

1262

1059

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1263

1060

"LastCheckedOK")

1264

last_checker_status = notifychangeproperty(dbus.Int16,

1265

"LastCheckerStatus")

1266

1061

last_approval_request = notifychangeproperty(

1267

1062

datetime_to_dbus, "LastApprovalRequest")

1268

1063

approved_by_default = notifychangeproperty(dbus.Boolean,

1269

1064

"ApprovedByDefault")

1270

approval_delay = notifychangeproperty(dbus.UInt64,

1065

approval_delay = notifychangeproperty(dbus.UInt16,

1271

1066

"ApprovalDelay",

1272

1067

type_func =

1273

timedelta_to_milliseconds)

1068

_timedelta_to_milliseconds)

1274

1069

approval_duration = notifychangeproperty(

1275

dbus.UInt64, "ApprovalDuration",

1276

type_func = timedelta_to_milliseconds)

1070

dbus.UInt16, "ApprovalDuration",

1071

type_func = _timedelta_to_milliseconds)

1277

1072

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

1278

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

1073

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

1279

1074

type_func =

1280

timedelta_to_milliseconds)

1075

_timedelta_to_milliseconds)

1281

1076

extended_timeout = notifychangeproperty(

1282

dbus.UInt64, "ExtendedTimeout",

1283

type_func = timedelta_to_milliseconds)

1284

interval = notifychangeproperty(dbus.UInt64,

1077

dbus.UInt16, "ExtendedTimeout",

1078

type_func = _timedelta_to_milliseconds)

1079

interval = notifychangeproperty(dbus.UInt16,

1285

1080

"Interval",

1286

1081

type_func =

1287

timedelta_to_milliseconds)

1082

_timedelta_to_milliseconds)

1288

1083

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

1289

1084

1290

1085

del notifychangeproperty

1332

1127

return r

1333

1128

1334

1129

def _reset_approved(self):

1335

self.approved = None

1130

self._approved = None

1336

1131

return False

1337

1132

1338

1133

def approve(self, value=True):

1339

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

1134

self.send_changedstate()

1135

self._approved = value

1136

gobject.timeout_add(_timedelta_to_milliseconds

1341

1137

(self.approval_duration),

1342

1138

self._reset_approved)

1343

self.send_changedstate()

1139

1344

1140

1345

1141

## D-Bus methods, signals & properties

1346

1142

_interface = "se.recompile.Mandos.Client"

1347

1143

1348

## Interfaces

1349

1350

@dbus_interface_annotations(_interface)

1351

def _foo(self):

1352

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

1353

"false"}

1354

1355

1144

## Signals

1356

1145

1357

1146

# CheckerCompleted - signal

1393

1182

"D-Bus signal"

1394

1183

return self.need_approval()

1395

1184

1185

# NeRwequest - signal

1186

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

1187

def NewRequest(self, ip):

1188

"""D-Bus signal

1189

Is sent after a client request a password.

1190

"""

1191

pass

1192

1396

1193

## Methods

1397

1194

1398

1195

# Approve - method

1456

1253

access="readwrite")

1457

1254

def ApprovalDuration_dbus_property(self, value=None):

1458

1255

if value is None: # get

1459

return dbus.UInt64(timedelta_to_milliseconds(

1256

return dbus.UInt64(_timedelta_to_milliseconds(

1460

1257

self.approval_duration))

1461

1258

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

1462

1259

1476

1273

def Host_dbus_property(self, value=None):

1477

1274

if value is None: # get

1478

1275

return dbus.String(self.host)

1479

self.host = unicode(value)

1276

self.host = value

1480

1277

1481

1278

# Created - property

1482

1279

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

1483

1280

def Created_dbus_property(self):

1484

return datetime_to_dbus(self.created)

1281

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

1485

1282

1486

1283

# LastEnabled - property

1487

1284

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

1508

1305

return

1509

1306

return datetime_to_dbus(self.last_checked_ok)

1510

1307

1511

# LastCheckerStatus - property

1512

@dbus_service_property(_interface, signature="n",

1513

access="read")

1514

def LastCheckerStatus_dbus_property(self):

1515

return dbus.Int16(self.last_checker_status)

1516

1517

1308

# Expires - property

1518

1309

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

1519

1310

def Expires_dbus_property(self):

1530

1321

def Timeout_dbus_property(self, value=None):

1531

1322

if value is None: # get

1532

1323

return dbus.UInt64(self.timeout_milliseconds())

1533

old_timeout = self.timeout

1534

1324

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

1535

# Reschedule disabling

1536

if self.enabled:

1537

now = datetime.datetime.utcnow()

1538

self.expires += self.timeout - old_timeout

1539

if self.expires <= now:

1540

# The timeout has passed

1541

self.disable()

1542

else:

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 = (

1548

gobject.timeout_add(

1549

timedelta_to_milliseconds(self.expires - now),

1550

self.disable))

1325

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

1326

return

1327

# Reschedule timeout

1328

gobject.source_remove(self.disable_initiator_tag)

1329

self.disable_initiator_tag = None

1330

self.expires = None

1331

time_to_die = _timedelta_to_milliseconds((self

1332

.last_checked_ok

1333

+ self.timeout)

1334

- datetime.datetime

1335

.utcnow())

1336

if time_to_die <= 0:

1337

# The timeout has passed

1338

self.disable()

1339

else:

1340

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

1341

+ datetime.timedelta(milliseconds =

1342

time_to_die))

1343

self.disable_initiator_tag = (gobject.timeout_add

1344

(time_to_die, self.disable))

1551

1345

1552

1346

# ExtendedTimeout - property

1553

1347

@dbus_service_property(_interface, signature="t",

1566

1360

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

1567

1361

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

1568

1362

return

1569

if self.enabled:

1570

# Reschedule checker run

1571

gobject.source_remove(self.checker_initiator_tag)

1572

self.checker_initiator_tag = (gobject.timeout_add

1573

(value, self.start_checker))

1574

self.start_checker() # Start one now, too

1363

# Reschedule checker run

1364

gobject.source_remove(self.checker_initiator_tag)

1365

self.checker_initiator_tag = (gobject.timeout_add

1366

(value, self.start_checker))

1367

self.start_checker() # Start one now, too

1575

1368

1576

1369

# Checker - property

1577

1370

@dbus_service_property(_interface, signature="s",

1579

1372

def Checker_dbus_property(self, value=None):

1580

1373

if value is None: # get

1581

1374

return dbus.String(self.checker_command)

1582

self.checker_command = unicode(value)

1375

self.checker_command = value

1583

1376

1584

1377

# CheckerRunning - property

1585

1378

@dbus_service_property(_interface, signature="b",

1614

1407

raise KeyError()

1615

1408

1616

1409

def __getattribute__(self, name):

1617

if name == '_pipe':

1410

if(name == '_pipe'):

1618

1411

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

1619

1412

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

1620

1413

data = self._pipe.recv()

1627

1420

return func

1628

1421

1629

1422

def __setattr__(self, name, value):

1630

if name == '_pipe':

1423

if(name == '_pipe'):

1631

1424

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

1632

1425

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

1633

1426

1634

1427

1428

class ClientDBusTransitional(ClientDBus):

1429

__metaclass__ = AlternateDBusNamesMetaclass

1430

1431

1635

1432

class ClientHandler(socketserver.BaseRequestHandler, object):

1636

1433

"""A class to handle client connections.

1637

1434

1698

1495

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

1699

1496

return

1700

1497

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

1498

if self.server.use_dbus:

1499

# Emit D-Bus signal

1500

client.NewRequest(str(self.client_address))

1701

1501

1702

1502

try:

1703

1503

client = ProxyClient(child_pipe, fpr,

1719

1519

client.Rejected("Disabled")

1720

1520

return

1721

1521

1722

if client.approved or not client.approval_delay:

1522

if client._approved or not client.approval_delay:

1723

1523

#We are approved or approval is disabled

1724

1524

break

1725

elif client.approved is None:

1525

elif client._approved is None:

1726

1526

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

1727

1527

client.name)

1728

1528

if self.server.use_dbus:

1741

1541

#wait until timeout or approved

1742

1542

time = datetime.datetime.now()

1743

1543

client.changedstate.acquire()

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1544

(client.changedstate.wait

1545

(float(client._timedelta_to_milliseconds(delay)

1546

/ 1000)))

1747

1547

client.changedstate.release()

1748

1548

time2 = datetime.datetime.now()

1749

1549

if (time2 - time) >= delay:

1765

1565

try:

1766

1566

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

1767

1567

except gnutls.errors.GNUTLSError as error:

1768

logger.warning("gnutls send failed",

1769

exc_info=error)

1568

logger.warning("gnutls send failed")

1770

1569

return

1771

1570

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

1772

1571

sent, len(client.secret)

1775

1574

1776

1575

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

1777

1576

# bump the timeout using extended_timeout

1778

client.bump_timeout(client.extended_timeout)

1577

client.checked_ok(client.extended_timeout)

1779

1578

if self.server.use_dbus:

1780

1579

# Emit D-Bus signal

1781

1580

client.GotSecret()

1786

1585

try:

1787

1586

session.bye()

1788

1587

except gnutls.errors.GNUTLSError as error:

1789

logger.warning("GnuTLS bye failed",

1790

exc_info=error)

1588

logger.warning("GnuTLS bye failed")

1791

1589

1792

1590

@staticmethod

1793

1591

def peer_certificate(session):

1858

1656

def sub_process_main(self, request, address):

1859

1657

try:

1860

1658

self.finish_request(request, address)

1861

except Exception:

1659

except:

1862

1660

self.handle_error(request, address)

1863

1661

self.close_request(request)

1864

1662

1865

1663

def process_request(self, request, address):

1866

1664

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

1867

1665

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

1868

args = (request, address))

1666

args = (request,

1667

address))

1869

1668

proc.start()

1870

1669

return proc

1871

1670

1899

1698

use_ipv6: Boolean; to use IPv6 or not

1900

1699

"""

1901

1700

def __init__(self, server_address, RequestHandlerClass,

1902

interface=None, use_ipv6=True, socketfd=None):

1903

"""If socketfd is set, use that file descriptor instead of

1904

creating a new one with socket.socket().

1905

"""

1701

interface=None, use_ipv6=True):

1906

1702

self.interface = interface

1907

1703

if use_ipv6:

1908

1704

self.address_family = socket.AF_INET6

1909

if socketfd is not None:

1910

# Save the file descriptor

1911

self.socketfd = socketfd

1912

# Save the original socket.socket() function

1913

self.socket_socket = socket.socket

1914

# To implement --socket, we monkey patch socket.socket.

1915

#

1916

# (When socketserver.TCPServer is a new-style class, we

1917

# could make self.socket into a property instead of monkey

1918

# patching socket.socket.)

1919

#

1920

# Create a one-time-only replacement for socket.socket()

1921

@functools.wraps(socket.socket)

1922

def socket_wrapper(*args, **kwargs):

1923

# Restore original function so subsequent calls are

1924

# not affected.

1925

socket.socket = self.socket_socket

1926

del self.socket_socket

1927

# This time only, return a new socket object from the

1928

# saved file descriptor.

1929

return socket.fromfd(self.socketfd, *args, **kwargs)

1930

# Replace socket.socket() function with wrapper

1931

socket.socket = socket_wrapper

1932

# The socketserver.TCPServer.__init__ will call

1933

# socket.socket(), which might be our replacement,

1934

# socket_wrapper(), if socketfd was set.

1935

1705

socketserver.TCPServer.__init__(self, server_address,

1936

1706

RequestHandlerClass)

1937

1938

1707

def server_bind(self):

1939

1708

"""This overrides the normal server_bind() function

1940

1709

to bind to an interface if one was specified, and also NOT to

1951

1720

str(self.interface

1952

1721

+ '\0'))

1953

1722

except socket.error as error:

1954

if error.errno == errno.EPERM:

1723

if error[0] == errno.EPERM:

1955

1724

logger.error("No permission to"

1956

1725

" bind to interface %s",

1957

1726

self.interface)

1958

elif error.errno == errno.ENOPROTOOPT:

1727

elif error[0] == errno.ENOPROTOOPT:

1959

1728

logger.error("SO_BINDTODEVICE not available;"

1960

1729

" cannot bind to interface %s",

1961

1730

self.interface)

1962

elif error.errno == errno.ENODEV:

1963

logger.error("Interface %s does not"

1964

" exist, cannot bind",

1965

self.interface)

1966

1731

else:

1967

1732

raise

1968

1733

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

1998

1763

"""

1999

1764

def __init__(self, server_address, RequestHandlerClass,

2000

1765

interface=None, use_ipv6=True, clients=None,

2001

gnutls_priority=None, use_dbus=True, socketfd=None):

1766

gnutls_priority=None, use_dbus=True):

2002

1767

self.enabled = False

2003

1768

self.clients = clients

2004

1769

if self.clients is None:

2008

1773

IPv6_TCPServer.__init__(self, server_address,

2009

1774

RequestHandlerClass,

2010

1775

interface = interface,

2011

use_ipv6 = use_ipv6,

2012

socketfd = socketfd)

1776

use_ipv6 = use_ipv6)

2013

1777

def server_activate(self):

2014

1778

if self.enabled:

2015

1779

return socketserver.TCPServer.server_activate(self)

2028

1792

2029

1793

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

2030

1794

proc = None, client_object=None):

1795

condition_names = {

1796

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

1797

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

1798

# blocking).

1799

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

1800

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

1801

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

1802

# broken, usually for pipes and

1803

# sockets).

1804

}

1805

conditions_string = ' | '.join(name

1806

for cond, name in

1807

condition_names.iteritems()

1808

if cond & condition)

2031

1809

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

2032

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

1810

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

2033

1811

# Wait for other process to exit

2034

1812

proc.join()

2035

1813

return False

2125

1903

elif suffix == "w":

2126

1904

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

2127

1905

else:

2128

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

2129

.format(suffix))

1906

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

2130

1907

except (ValueError, IndexError) as e:

2131

1908

raise ValueError(*(e.args))

2132

1909

timevalue += delta

2146

1923

sys.exit()

2147

1924

if not noclose:

2148

1925

# Close all standard open file descriptors

2149

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

1926

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

2150

1927

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

2151

1928

raise OSError(errno.ENODEV,

2152

"{0} not a character device"

2153

.format(os.devnull))

1929

"%s not a character device"

1930

% os.path.devnull)

2154

1931

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

2155

1932

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

2156

1933

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

2165

1942

2166

1943

parser = argparse.ArgumentParser()

2167

1944

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

2168

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

1945

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

2169

1946

help="show version number and exit")

2170

1947

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

2171

1948

help="Bind to interface IF")

2195

1972

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

2196

1973

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

2197

1974

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

2198

" state")

2199

parser.add_argument("--socket", type=int,

2200

help="Specify a file descriptor to a network"

2201

" socket to use instead of creating one")

2202

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

2203

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

1975

" state", default=True)

2204

1976

2205

1977

options = parser.parse_args()

2206

1978

2220

1992

"use_dbus": "True",

2221

1993

"use_ipv6": "True",

2222

1994

"debuglevel": "",

2223

"restore": "True",

2224

"socket": "",

2225

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

2226

1995

}

2227

1996

2228

1997

# Parse config file for server-global settings

2239

2008

if server_settings["port"]:

2240

2009

server_settings["port"] = server_config.getint("DEFAULT",

2241

2010

"port")

2242

if server_settings["socket"]:

2243

server_settings["socket"] = server_config.getint("DEFAULT",

2244

"socket")

2245

# Later, stdin will, and stdout and stderr might, be dup'ed

2246

# over with an opened os.devnull. But we don't want this to

2247

# happen with a supplied network socket.

2248

if 0 <= server_settings["socket"] <= 2:

2249

server_settings["socket"] = os.dup(server_settings

2250

["socket"])

2251

2011

del server_config

2252

2012

2253

2013

# Override the settings from the config file with command line

2254

2014

# options, if set.

2255

2015

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

2256

2016

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

2257

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

2258

"statedir", "socket"):

2017

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

2259

2018

value = getattr(options, option)

2260

2019

if value is not None:

2261

2020

server_settings[option] = value

2273

2032

debuglevel = server_settings["debuglevel"]

2274

2033

use_dbus = server_settings["use_dbus"]

2275

2034

use_ipv6 = server_settings["use_ipv6"]

2276

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

2277

stored_state_file)

2278

2035

2279

2036

if debug:

2280

initlogger(debug, logging.DEBUG)

2037

initlogger(logging.DEBUG)

2281

2038

else:

2282

2039

if not debuglevel:

2283

initlogger(debug)

2040

initlogger()

2284

2041

else:

2285

2042

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

2286

initlogger(debug, level)

2043

initlogger(level)

2287

2044

2288

2045

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

2289

2046

syslogger.setFormatter(logging.Formatter

2290

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

2291

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

2292

.format(server_settings

2293

["servicename"])))

2047

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

2048

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

2049

% server_settings["servicename"]))

2294

2050

2295

2051

# Parse config file with clients

2296

client_config = configparser.SafeConfigParser(Client

2297

.client_defaults)

2052

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

2053

"extended_timeout": "15m",

2054

"interval": "2m",

2055

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

2056

"host": "",

2057

"approval_delay": "0s",

2058

"approval_duration": "1s",

2059

}

2060

client_config = configparser.SafeConfigParser(client_defaults)

2298

2061

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

2299

2062

"clients.conf"))

2300

2063

2309

2072

use_ipv6=use_ipv6,

2310

2073

gnutls_priority=

2311

2074

server_settings["priority"],

2312

use_dbus=use_dbus,

2313

socketfd=(server_settings["socket"]

2314

or None))

2075

use_dbus=use_dbus)

2315

2076

if not debug:

2316

2077

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

2317

2078

try:

2318

2079

pidfile = open(pidfilename, "w")

2319

except IOError as e:

2320

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

2321

exc_info=e)

2080

except IOError:

2081

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

2322

2082

2323

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

2083

try:

2084

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

2085

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

2086

except KeyError:

2324

2087

try:

2325

uid = pwd.getpwnam(name).pw_uid

2326

gid = pwd.getpwnam(name).pw_gid

2327

break

2088

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

2089

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

2328

2090

except KeyError:

2329

continue

2330

else:

2331

uid = 65534

2332

gid = 65534

2091

try:

2092

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

2093

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

2094

except KeyError:

2095

uid = 65534

2096

gid = 65534

2333

2097

try:

2334

2098

os.setgid(gid)

2335

2099

os.setuid(uid)

2336

2100

except OSError as error:

2337

if error.errno != errno.EPERM:

2101

if error[0] != errno.EPERM:

2338

2102

raise error

2339

2103

2340

2104

if debug:

2352

2116

.gnutls_global_set_log_function(debug_gnutls))

2353

2117

2354

2118

# Redirect stdin so all checkers get /dev/null

2355

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

2119

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

2356

2120

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

2357

2121

if null > 2:

2358

2122

os.close(null)

2123

else:

2124

# No console logging

2125

logger.removeHandler(console)

2359

2126

2360

2127

# Need to fork before connecting to D-Bus

2361

2128

if not debug:

2362

2129

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

2363

2130

daemon()

2364

2131

2365

# multiprocessing will use threads, so before we use gobject we

2366

# need to inform gobject that threads will be used.

2367

gobject.threads_init()

2368

2369

2132

global main_loop

2370

2133

# From the Avahi example code

2371

DBusGMainLoop(set_as_default=True)

2134

DBusGMainLoop(set_as_default=True )

2372

2135

main_loop = gobject.MainLoop()

2373

2136

bus = dbus.SystemBus()

2374

2137

# End of Avahi example code

2380

2143

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

2381

2144

do_not_queue=True))

2382

2145

except dbus.exceptions.NameExistsException as e:

2383

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

2146

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

2384

2147

use_dbus = False

2385

2148

server_settings["use_dbus"] = False

2386

2149

tcp_server.use_dbus = False

2398

2161

2399

2162

client_class = Client

2400

2163

if use_dbus:

2401

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

2402

2403

client_settings = Client.config_parser(client_config)

2164

client_class = functools.partial(ClientDBusTransitional,

2165

bus = bus)

2166

2167

special_settings = {

2168

# Some settings need to be accessd by special methods;

2169

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

2170

"approved_by_default":

2171

lambda section:

2172

client_config.getboolean(section, "approved_by_default"),

2173

}

2174

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

2175

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

2176

# with exceptions for any special settings as defined above

2177

client_settings = dict((clientname,

2178

dict((setting,

2179

(value

2180

if setting not in special_settings

2181

else special_settings[setting]

2182

(clientname)))

2183

for setting, value in

2184

client_config.items(clientname)))

2185

for clientname in client_config.sections())

2186

2404

2187

old_client_settings = {}

2405

clients_data = {}

2188

clients_data = []

2406

2189

2407

2190

# Get client data and settings from last running state.

2408

2191

if server_settings["restore"]:

2412

2195

(stored_state))

2413

2196

os.remove(stored_state_path)

2414

2197

except IOError as e:

2415

if e.errno == errno.ENOENT:

2416

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

2417

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

2418

else:

2419

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

2420

exc_info=e)

2198

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

2199

.format(e))

2200

if e.errno != errno.ENOENT:

2421

2201

raise

2422

except EOFError as e:

2423

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

2424

"EOFError:", exc_info=e)

2425

2202

2426

with PGPEngine() as pgp:

2427

for client_name, client in clients_data.iteritems():

2203

with Crypto() as crypt:

2204

for client in clients_data:

2205

client_name = client["name"]

2206

2428

2207

# Decide which value to use after restoring saved state.

2429

2208

# We have three different values: Old config file,

2430

2209

# new config file, and saved state.

2438

2217

if (name != "secret" and

2439

2218

value != old_client_settings[client_name]

2440

2219

[name]):

2441

client[name] = value

2220

setattr(client, name, value)

2442

2221

except KeyError:

2443

2222

pass

2444

2223

2445

2224

# Clients who has passed its expire date can still be

2446

# enabled if its last checker was successful. Clients

2447

# whose checker succeeded before we stored its state is

2448

# assumed to have successfully run all checkers during

2449

# downtime.

2450

if client["enabled"]:

2451

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

2452

if not client["last_checked_ok"]:

2453

logger.warning(

2454

"disabling client {0} - Client never "

2455

"performed a successful checker"

2456

.format(client_name))

2457

client["enabled"] = False

2458

elif client["last_checker_status"] != 0:

2459

logger.warning(

2460

"disabling client {0} - Client "

2461

"last checker failed with error code {1}"

2462

.format(client_name,

2463

client["last_checker_status"]))

2225

# enabled if its last checker was sucessful. Clients

2226

# whose checker failed before we stored its state is

2227

# assumed to have failed all checkers during downtime.

2228

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

2229

if ((datetime.datetime.utcnow()

2230

- client["last_checked_ok"])

2231

> client["interval"]):

2232

if client["last_checker_status"] != 0:

2464

2233

client["enabled"] = False

2465

2234

else:

2466

2235

client["expires"] = (datetime.datetime

2467

2236

.utcnow()

2468

2237

+ client["timeout"])

2469

logger.debug("Last checker succeeded,"

2470

" keeping {0} enabled"

2471

.format(client_name))

2238

2239

client["changedstate"] = (multiprocessing_manager

2240

.Condition

2241

(multiprocessing_manager

2242

.Lock()))

2243

if use_dbus:

2244

new_client = (ClientDBusTransitional.__new__

2245

(ClientDBusTransitional))

2246

tcp_server.clients[client_name] = new_client

2247

new_client.bus = bus

2248

for name, value in client.iteritems():

2249

setattr(new_client, name, value)

2250

client_object_name = unicode(client_name).translate(

2251

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

2252

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

2253

new_client.dbus_object_path = (dbus.ObjectPath

2254

("/clients/"

2255

+ client_object_name))

2256

DBusObjectWithProperties.__init__(new_client,

2257

new_client.bus,

2258

new_client

2259

.dbus_object_path)

2260

else:

2261

tcp_server.clients[client_name] = (Client.__new__

2262

(Client))

2263

for name, value in client.iteritems():

2264

setattr(tcp_server.clients[client_name],

2265

name, value)

2266

2472

2267

try:

2473

client["secret"] = (

2474

pgp.decrypt(client["encrypted_secret"],

2475

client_settings[client_name]

2476

["secret"]))

2477

except PGPError:

2268

tcp_server.clients[client_name].secret = (

2269

crypt.decrypt(tcp_server.clients[client_name]

2270

.encrypted_secret,

2271

client_settings[client_name]

2272

["secret"]))

2273

except CryptoError:

2478

2274

# If decryption fails, we use secret from new settings

2479

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

2480

.format(client_name))

2481

client["secret"] = (

2275

tcp_server.clients[client_name].secret = (

2482

2276

client_settings[client_name]["secret"])

2483

2277

2484

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

2485

for client_name in (set(old_client_settings)

2486

- set(client_settings)):

2487

del clients_data[client_name]

2488

for client_name in (set(client_settings)

2489

- set(old_client_settings)):

2490

clients_data[client_name] = client_settings[client_name]

2491

2492

# Create all client objects

2493

for client_name, client in clients_data.iteritems():

2494

tcp_server.clients[client_name] = client_class(

2495

name = client_name, settings = client)

2278

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

2279

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

2280

del tcp_server.clients[clientname]

2281

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

2282

tcp_server.clients[clientname] = (client_class(name

2283

= clientname,

2284

config =

2285

client_settings

2286

[clientname]))

2496

2287

2497

2288

if not tcp_server.clients:

2498

2289

logger.warning("No clients defined")

2499

2290

2500

2291

if not debug:

2501

2292

try:

2502

2293

with pidfile:

2510

2301

# "pidfile" was never created

2511

2302

pass

2512

2303

del pidfilename

2304

2305

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

2513

2306

2514

2307

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

2515

2308

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

2516

2309

2517

2310

if use_dbus:

2518

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

2519

"se.bsnet.fukt.Mandos"})

2520

class MandosDBusService(DBusObjectWithProperties):

2311

class MandosDBusService(dbus.service.Object):

2521

2312

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

2522

2313

def __init__(self):

2523

2314

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

2524

2315

_interface = "se.recompile.Mandos"

2525

2316

2526

@dbus_interface_annotations(_interface)

2527

def _foo(self):

2528

return { "org.freedesktop.DBus.Property"

2529

".EmitsChangedSignal":

2530

"false"}

2531

2532

2317

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

2533

2318

def ClientAdded(self, objpath):

2534

2319

"D-Bus signal"

2576

2361

2577

2362

del _interface

2578

2363

2579

mandos_dbus_service = MandosDBusService()

2364

class MandosDBusServiceTransitional(MandosDBusService):

2365

__metaclass__ = AlternateDBusNamesMetaclass

2366

mandos_dbus_service = MandosDBusServiceTransitional()

2580

2367

2581

2368

def cleanup():

2582

2369

"Cleanup function; run on exit"

2589

2376

# Store client before exiting. Secrets are encrypted with key

2590

2377

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

2591

2378

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

2592

clients = {}

2593

with PGPEngine() as pgp:

2379

clients = []

2380

with Crypto() as crypt:

2594

2381

for client in tcp_server.clients.itervalues():

2595

2382

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

2596

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

2597

key)

2383

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

2384

key)

2598

2385

client_dict = {}

2599

2386

2600

# A list of attributes that can not be pickled

2601

# + secret.

2602

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

2603

"checker"))

2387

# A list of attributes that will not be stored when

2388

# shutting down.

2389

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

2604

2390

for name, typ in (inspect.getmembers

2605

2391

(dbus.service.Object)):

2606

2392

exclude.add(name)

2611

2397

if attr not in exclude:

2612

2398

client_dict[attr] = getattr(client, attr)

2613

2399

2614

clients[client.name] = client_dict

2400

clients.append(client_dict)

2615

2401

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

2616

2402

2617

2403

try:

2618

with (tempfile.NamedTemporaryFile

2619

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

2620

dir=os.path.dirname(stored_state_path),

2621

delete=False)) as stored_state:

2404

with os.fdopen(os.open(stored_state_path,

2405

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

2406

0600), "wb") as stored_state:

2622

2407

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

2623

tempname=stored_state.name

2624

os.rename(tempname, stored_state_path)

2625

2408

except (IOError, OSError) as e:

2626

if not debug:

2627

try:

2628

os.remove(tempname)

2629

except NameError:

2630

pass

2631

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

2632

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

2633

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

2634

else:

2635

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

2636

exc_info=e)

2637

raise e

2409

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

2410

.format(e))

2411

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

2412

raise

2638

2413

2639

2414

# Delete all clients, and settings from config

2640

2415

while tcp_server.clients:

2667

2442

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

2668

2443

if use_ipv6:

2669

2444

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

2670

" flowinfo %d, scope_id %d",

2671

*tcp_server.socket.getsockname())

2445

" flowinfo %d, scope_id %d"

2446

% tcp_server.socket.getsockname())

2672

2447

else: # IPv4

2673

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

2674

*tcp_server.socket.getsockname())

2448

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

2449

% tcp_server.socket.getsockname())

2675

2450

2676

2451

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

2677

2452

2680

2455

try:

2681

2456

service.activate()

2682

2457

except dbus.exceptions.DBusException as error:

2683

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

2458

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

2684

2459

cleanup()

2685

2460

sys.exit(1)

2686

2461

# End of Avahi example code

2693

2468

logger.debug("Starting main loop")

2694

2469

main_loop.run()

2695

2470

except AvahiError as error:

2696

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

2471

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

2697

2472

cleanup()

2698

2473

sys.exit(1)

2699

2474

except KeyboardInterrupt:

2704

2479

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

2705

2480

cleanup()

2706

2481

2482

2707

2483

if __name__ == '__main__':

2708

2484

main()