/mandos/trunk : revision 525

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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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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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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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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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"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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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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"""

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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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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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""" 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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with exceptions for any special settings as defined above"""

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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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# 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["enabled"] = config.getboolean(client_name, "enabled")

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

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.replace(" ", ""))

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

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% 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["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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client["last_checker_status"] = None

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if client["enabled"]:

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

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

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+ client["timeout"])

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else:

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client["last_enabled"] = None

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client["expires"] = None

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return settings

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def __init__(self, settings, name = 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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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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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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self.created = settings.get("created", datetime.datetime.utcnow())

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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

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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

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

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if not quiet:

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self.send_changedstate()

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if not quiet:

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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:

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

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

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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)

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self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

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if not quiet:

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self.send_changedstate()

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

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return False

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def init_checker(self):

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

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# and every interval from then on.

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if self.checker_initiator_tag is not None:

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = (gobject.timeout_add

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(self.interval_milliseconds(),

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self.start_checker))

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

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

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

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vars(self))

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def checked_ok(self):

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

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self.last_checked_ok = datetime.datetime.utcnow()

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self.last_checker_status = 0

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self.bump_timeout()

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def bump_timeout(self, timeout=None):

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

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def checked_ok(self, timeout=None):

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"""Bump up the timeout for this client.

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

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alive and well.

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"""

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if timeout is None:

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timeout = self.timeout

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self.last_checked_ok = datetime.datetime.utcnow()

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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

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self.disable_initiator_tag = (gobject.timeout_add

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(timedelta_to_milliseconds

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If a checker already exists, leave it running and do

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nothing."""

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

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

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

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# 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.

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self.current_checker_command)

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# Start a new checker if needed

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if self.checker is None:

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# Escape attributes for the shell

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escaped_attrs = dict(

696

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

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for attr in

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self.runtime_expansions)

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try:

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command = self.checker_command % escaped_attrs

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except TypeError as error:

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

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self.checker_command, exc_info=error)

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return True # Try again later

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# In case checker_command has exactly one % operator

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command = self.checker_command % self.host

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except TypeError:

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# Escape attributes for the shell

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escaped_attrs = dict(

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(attr,

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

676

errors=

677

'replace')))

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for attr in

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self.runtime_expansions)

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try:

682

command = self.checker_command % escaped_attrs

683

except TypeError as error:

684

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

685

' %s', self.checker_command, error)

686

return True # Try again later

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self.current_checker_command = command

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try:

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

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self.checker = subprocess.Popen(command,

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close_fds=True,

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shell=True, cwd="/")

698

self.checker_callback_tag = (gobject.child_watch_add

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(self.checker.pid,

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self.checker_callback,

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data=command))

702

# The checker may have completed before the gobject

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# watch was added. Check for this.

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

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if pid:

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gobject.source_remove(self.checker_callback_tag)

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self.checker_callback(pid, status, command)

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except OSError as error:

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logger.error("Failed to start subprocess",

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exc_info=error)

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self.checker_callback_tag = (gobject.child_watch_add

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(self.checker.pid,

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self.checker_callback,

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data=command))

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# The checker may have completed before the gobject

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# 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)

709

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

710

error)

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

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return True

731

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return

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

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try:

741

self.checker.terminate()

723

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

742

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#time.sleep(0.5)

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

744

# self.checker.kill()

726

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

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except OSError as error:

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728

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

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raise

764

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

765

747

if byte_arrays and signature != "ay":

766

748

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

767

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

749

" signature %r" % signature)

768

750

def decorator(func):

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func._dbus_is_property = True

770

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func._dbus_interface = dbus_interface

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return decorator

779

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def dbus_interface_annotations(dbus_interface):

782

"""Decorator for marking functions returning interface annotations

783

784

Usage:

785

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@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":

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"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

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799

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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

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763

class DBusPropertyException(dbus.exceptions.DBusException):

819

764

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

820

765

"""

843

788

"""

844

789

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790

@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)

791

def _is_dbus_property(obj):

792

return getattr(obj, "_dbus_is_property", False)

854

793

855

def _get_all_dbus_things(self, thing):

794

def _get_all_dbus_properties(self):

856

795

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

857

796

"""

858

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

859

name),

860

athing.__get__(self))

797

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

861

798

for cls in self.__class__.__mro__

862

for name, athing in

863

inspect.getmembers(cls,

864

self._is_dbus_thing(thing)))

799

for name, prop in

800

inspect.getmembers(cls, self._is_dbus_property))

865

801

866

802

def _get_dbus_property(self, interface_name, property_name):

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803

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

869

805

"""

870

806

for cls in self.__class__.__mro__:

871

807

for name, value in (inspect.getmembers

872

(cls,

873

self._is_dbus_thing("property"))):

808

(cls, self._is_dbus_property)):

874

809

if (value._dbus_name == property_name

875

810

and value._dbus_interface == interface_name):

876

811

return value.__get__(self)

905

840

# signatures other than "ay".

906

841

if prop._dbus_signature != "ay":

907

842

raise ValueError

908

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

909

for byte in value))

843

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

844

for byte in value))

910

845

prop(value)

911

846

912

847

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

918

853

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

919

854

"""

920

855

properties = {}

921

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

856

for name, prop in self._get_all_dbus_properties():

922

857

if (interface_name

923

858

and interface_name != prop._dbus_interface):

924

859

# Interface non-empty but did not match

939

874

path_keyword='object_path',

940

875

connection_keyword='connection')

941

876

def Introspect(self, object_path, connection):

942

"""Overloading of standard D-Bus method.

943

944

Inserts property tags and interface annotation tags.

877

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

945

878

"""

946

879

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

947

880

connection)

954

887

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

955

888

return e

956

889

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

957

# Add property tags

958

890

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

959

891

for name, prop

960

in self._get_all_dbus_things("property")

892

in self._get_all_dbus_properties()

961

893

if prop._dbus_interface

962

894

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

963

895

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

896

# Add the names to the return values for the

996

897

# "org.freedesktop.DBus.Properties" methods

997

898

if (if_tag.getAttribute("name")

1012

913

except (AttributeError, xml.dom.DOMException,

1013

914

xml.parsers.expat.ExpatError) as error:

1014

915

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

1015

exc_info=error)

916

error)

1016

917

return xmlstring

1017

918

1018

919

1024

925

variant_level=variant_level)

1025

926

1026

927

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_names({"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).

928

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

929

.__metaclass__):

930

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

931

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

1049

932

"""

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):

933

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

934

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

935

# methods, signals, or properties in them

936

for base in (b for b in bases

937

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

938

# Go though all attributes of the base class

939

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

1057

940

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

1058

941

# with the wrong interface name

1059

942

if (not hasattr(attribute, "_dbus_interface")

1060

943

or not attribute._dbus_interface

1061

.startswith(orig_interface_name)):

944

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

1062

945

continue

1063

946

# Create an alternate D-Bus interface name based on

1064

947

# the current name

1065

948

alt_interface = (attribute._dbus_interface

1066

.replace(orig_interface_name,

1067

alt_interface_name))

1068

interface_names.add(alt_interface)

949

.replace("se.recompile.Mandos",

950

"se.bsnet.fukt.Mandos"))

1069

951

# Is this a D-Bus signal?

1070

952

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

1071

953

# Extract the original non-method function by

1086

968

nonmethod_func.func_name,

1087

969

nonmethod_func.func_defaults,

1088

970

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

971

# 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

972

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

973

# signals gets sent when the function is called

1099

974

def fixscope(func1, func2):

1100

975

"""This function is a scope container to pass

1101

976

func1 and func2 to the "call_both" function

1108

983

return call_both

1109

984

# Create the "call_both" function and add it to

1110

985

# the class

1111

attr[attrname] = fixscope(attribute, new_function)

986

attr[attrname] = fixscope(attribute,

987

new_function)

1112

988

# Is this a D-Bus method?

1113

989

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

1114

990

# Create a new, but exactly alike, function

1125

1001

attribute.func_name,

1126

1002

attribute.func_defaults,

1127

1003

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

1004

# Is this a D-Bus property?

1135

1005

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

1136

1006

# Create a new, but exactly alike, function

1150

1020

attribute.func_name,

1151

1021

attribute.func_defaults,

1152

1022

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"})

1023

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

1024

1025

1198

1026

class ClientDBus(Client, DBusObjectWithProperties):

1199

1027

"""A Client class using D-Bus

1200

1028

1211

1039

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

1212

1040

self.bus = bus

1213

1041

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

1042

self._approvals_pending = 0

1043

1044

self._approvals_pending = 0

1214

1045

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

1215

1046

# the D-Bus

1216

1047

client_object_name = unicode(self.name).translate(

1220

1051

("/clients/" + client_object_name))

1221

1052

DBusObjectWithProperties.__init__(self, self.bus,

1222

1053

self.dbus_object_path)

1223

1054

1224

1055

def notifychangeproperty(transform_func,

1225

1056

dbus_name, type_func=lambda x: x,

1226

1057

variant_level=1):

1249

1080

1250

1081

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

1251

1082

1083

1252

1084

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1253

1085

approvals_pending = notifychangeproperty(dbus.Boolean,

1254

1086

"ApprovalPending",

1261

1093

checker is not None)

1262

1094

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1263

1095

"LastCheckedOK")

1264

last_checker_status = notifychangeproperty(dbus.Int16,

1265

"LastCheckerStatus")

1266

1096

last_approval_request = notifychangeproperty(

1267

1097

datetime_to_dbus, "LastApprovalRequest")

1268

1098

approved_by_default = notifychangeproperty(dbus.Boolean,

1336

1166

return False

1337

1167

1338

1168

def approve(self, value=True):

1169

self.send_changedstate()

1339

1170

self.approved = value

1340

1171

gobject.timeout_add(timedelta_to_milliseconds

1341

1172

(self.approval_duration),

1342

1173

self._reset_approved)

1343

self.send_changedstate()

1174

1344

1175

1345

1176

## D-Bus methods, signals & properties

1346

1177

_interface = "se.recompile.Mandos.Client"

1347

1178

1348

## Interfaces

1349

1350

@dbus_interface_annotations(_interface)

1351

def _foo(self):

1352

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

1353

"false"}

1354

1355

1179

## Signals

1356

1180

1357

1181

# CheckerCompleted - signal

1393

1217

"D-Bus signal"

1394

1218

return self.need_approval()

1395

1219

1220

# NeRwequest - signal

1221

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

1222

def NewRequest(self, ip):

1223

"""D-Bus signal

1224

Is sent after a client request a password.

1225

"""

1226

pass

1227

1396

1228

## Methods

1397

1229

1398

1230

# Approve - method

1508

1340

return

1509

1341

return datetime_to_dbus(self.last_checked_ok)

1510

1342

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

1343

# Expires - property

1518

1344

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

1519

1345

def Expires_dbus_property(self):

1530

1356

def Timeout_dbus_property(self, value=None):

1531

1357

if value is None: # get

1532

1358

return dbus.UInt64(self.timeout_milliseconds())

1533

old_timeout = self.timeout

1534

1359

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))

1360

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

1361

return

1362

# Reschedule timeout

1363

gobject.source_remove(self.disable_initiator_tag)

1364

self.disable_initiator_tag = None

1365

self.expires = None

1366

time_to_die = timedelta_to_milliseconds((self

1367

.last_checked_ok

1368

+ self.timeout)

1369

- datetime.datetime

1370

.utcnow())

1371

if time_to_die <= 0:

1372

# The timeout has passed

1373

self.disable()

1374

else:

1375

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

1376

+ datetime.timedelta(milliseconds =

1377

time_to_die))

1378

self.disable_initiator_tag = (gobject.timeout_add

1379

(time_to_die, self.disable))

1551

1380

1552

1381

# ExtendedTimeout - property

1553

1382

@dbus_service_property(_interface, signature="t",

1632

1461

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

1633

1462

1634

1463

1464

class ClientDBusTransitional(ClientDBus):

1465

__metaclass__ = AlternateDBusNamesMetaclass

1466

1467

1635

1468

class ClientHandler(socketserver.BaseRequestHandler, object):

1636

1469

"""A class to handle client connections.

1637

1470

1705

1538

except KeyError:

1706

1539

return

1707

1540

1541

if self.server.use_dbus:

1542

# Emit D-Bus signal

1543

client.NewRequest(str(self.client_address))

1544

1708

1545

if client.approval_delay:

1709

1546

delay = client.approval_delay

1710

1547

client.approvals_pending += 1

1741

1578

#wait until timeout or approved

1742

1579

time = datetime.datetime.now()

1743

1580

client.changedstate.acquire()

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1581

(client.changedstate.wait

1582

(float(client.timedelta_to_milliseconds(delay)

1583

/ 1000)))

1747

1584

client.changedstate.release()

1748

1585

time2 = datetime.datetime.now()

1749

1586

if (time2 - time) >= delay:

1765

1602

try:

1766

1603

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

1767

1604

except gnutls.errors.GNUTLSError as error:

1768

logger.warning("gnutls send failed",

1769

exc_info=error)

1605

logger.warning("gnutls send failed")

1770

1606

return

1771

1607

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

1772

1608

sent, len(client.secret)

1775

1611

1776

1612

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

1777

1613

# bump the timeout using extended_timeout

1778

client.bump_timeout(client.extended_timeout)

1614

client.checked_ok(client.extended_timeout)

1779

1615

if self.server.use_dbus:

1780

1616

# Emit D-Bus signal

1781

1617

client.GotSecret()

1786

1622

try:

1787

1623

session.bye()

1788

1624

except gnutls.errors.GNUTLSError as error:

1789

logger.warning("GnuTLS bye failed",

1790

exc_info=error)

1625

logger.warning("GnuTLS bye failed")

1791

1626

1792

1627

@staticmethod

1793

1628

def peer_certificate(session):

1865

1700

def process_request(self, request, address):

1866

1701

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

1867

1702

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

1868

args = (request, address))

1703

args = (request,

1704

address))

1869

1705

proc.start()

1870

1706

return proc

1871

1707

1921

1757

str(self.interface

1922

1758

+ '\0'))

1923

1759

except socket.error as error:

1924

if error.errno == errno.EPERM:

1760

if error[0] == errno.EPERM:

1925

1761

logger.error("No permission to"

1926

1762

" bind to interface %s",

1927

1763

self.interface)

1928

elif error.errno == errno.ENOPROTOOPT:

1764

elif error[0] == errno.ENOPROTOOPT:

1929

1765

logger.error("SO_BINDTODEVICE not available;"

1930

1766

" cannot bind to interface %s",

1931

1767

self.interface)

1932

elif error.errno == errno.ENODEV:

1933

logger.error("Interface %s does not"

1934

" exist, cannot bind",

1935

self.interface)

1936

1768

else:

1937

1769

raise

1938

1770

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

1997

1829

1998

1830

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

1999

1831

proc = None, client_object=None):

1832

condition_names = {

1833

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

1834

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

1835

# blocking).

1836

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

1837

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

1838

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

1839

# broken, usually for pipes and

1840

# sockets).

1841

}

1842

conditions_string = ' | '.join(name

1843

for cond, name in

1844

condition_names.iteritems()

1845

if cond & condition)

2000

1846

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

2001

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

1847

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

2002

1848

# Wait for other process to exit

2003

1849

proc.join()

2004

1850

return False

2094

1940

elif suffix == "w":

2095

1941

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

2096

1942

else:

2097

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

2098

.format(suffix))

1943

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

2099

1944

except (ValueError, IndexError) as e:

2100

1945

raise ValueError(*(e.args))

2101

1946

timevalue += delta

2115

1960

sys.exit()

2116

1961

if not noclose:

2117

1962

# Close all standard open file descriptors

2118

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

1963

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

2119

1964

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

2120

1965

raise OSError(errno.ENODEV,

2121

"{0} not a character device"

2122

.format(os.devnull))

1966

"%s not a character device"

1967

% os.path.devnull)

2123

1968

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

2124

1969

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

2125

1970

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

2134

1979

2135

1980

parser = argparse.ArgumentParser()

2136

1981

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

2137

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

1982

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

2138

1983

help="show version number and exit")

2139

1984

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

2140

1985

help="Bind to interface IF")

2233

2078

stored_state_file)

2234

2079

2235

2080

if debug:

2236

initlogger(debug, logging.DEBUG)

2081

initlogger(logging.DEBUG)

2237

2082

else:

2238

2083

if not debuglevel:

2239

initlogger(debug)

2084

initlogger()

2240

2085

else:

2241

2086

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

2242

initlogger(debug, level)

2087

initlogger(level)

2243

2088

2244

2089

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

2245

2090

syslogger.setFormatter(logging.Formatter

2246

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

2247

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

2248

.format(server_settings

2249

["servicename"])))

2091

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

2092

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

2093

% server_settings["servicename"]))

2250

2094

2251

2095

# Parse config file with clients

2252

client_config = configparser.SafeConfigParser(Client

2253

.client_defaults)

2096

client_config = configparser.SafeConfigParser(Client.client_defaults)

2254

2097

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

2255

2098

"clients.conf"))

2256

2099

2270

2113

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

2271

2114

try:

2272

2115

pidfile = open(pidfilename, "w")

2273

except IOError as e:

2274

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

2275

exc_info=e)

2116

except IOError:

2117

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

2276

2118

2277

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

2119

try:

2120

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

2121

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

2122

except KeyError:

2278

2123

try:

2279

uid = pwd.getpwnam(name).pw_uid

2280

gid = pwd.getpwnam(name).pw_gid

2281

break

2124

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

2125

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

2282

2126

except KeyError:

2283

continue

2284

else:

2285

uid = 65534

2286

gid = 65534

2127

try:

2128

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

2129

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

2130

except KeyError:

2131

uid = 65534

2132

gid = 65534

2287

2133

try:

2288

2134

os.setgid(gid)

2289

2135

os.setuid(uid)

2290

2136

except OSError as error:

2291

if error.errno != errno.EPERM:

2137

if error[0] != errno.EPERM:

2292

2138

raise error

2293

2139

2294

2140

if debug:

2306

2152

.gnutls_global_set_log_function(debug_gnutls))

2307

2153

2308

2154

# Redirect stdin so all checkers get /dev/null

2309

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

2155

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

2310

2156

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

2311

2157

if null > 2:

2312

2158

os.close(null)

2159

else:

2160

# No console logging

2161

logger.removeHandler(console)

2313

2162

2314

2163

# Need to fork before connecting to D-Bus

2315

2164

if not debug:

2316

2165

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

2317

2166

daemon()

2318

2167

2319

gobject.threads_init()

2320

2321

2168

global main_loop

2322

2169

# From the Avahi example code

2323

DBusGMainLoop(set_as_default=True)

2170

DBusGMainLoop(set_as_default=True )

2324

2171

main_loop = gobject.MainLoop()

2325

2172

bus = dbus.SystemBus()

2326

2173

# End of Avahi example code

2332

2179

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

2333

2180

do_not_queue=True))

2334

2181

except dbus.exceptions.NameExistsException as e:

2335

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

2182

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

2336

2183

use_dbus = False

2337

2184

server_settings["use_dbus"] = False

2338

2185

tcp_server.use_dbus = False

2350

2197

2351

2198

client_class = Client

2352

2199

if use_dbus:

2353

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

2200

client_class = functools.partial(ClientDBusTransitional,

2201

bus = bus)

2354

2202

2355

2203

client_settings = Client.config_parser(client_config)

2356

2204

old_client_settings = {}

2364

2212

(stored_state))

2365

2213

os.remove(stored_state_path)

2366

2214

except IOError as e:

2367

if e.errno == errno.ENOENT:

2368

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

2369

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

2370

else:

2371

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

2372

exc_info=e)

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2373

2218

raise

2374

except EOFError as e:

2375

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

2376

"EOFError:", exc_info=e)

2377

2219

2378

2220

with PGPEngine() as pgp:

2379

2221

for client_name, client in clients_data.iteritems():

2396

2238

2397

2239

# Clients who has passed its expire date can still be

2398

2240

# enabled if its last checker was successful. Clients

2399

# whose checker succeeded before we stored its state is

2400

# assumed to have successfully run all checkers during

2401

# downtime.

2241

# whose checker failed before we stored its state is

2242

# assumed to have failed all checkers during downtime.

2402

2243

if client["enabled"]:

2403

2244

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

2404

2245

if not client["last_checked_ok"]:

2405

2246

logger.warning(

2406

2247

"disabling client {0} - Client never "

2407

"performed a successful checker"

2408

.format(client_name))

2248

"performed a successfull checker"

2249

.format(client["name"]))

2409

2250

client["enabled"] = False

2410

2251

elif client["last_checker_status"] != 0:

2411

2252

logger.warning(

2412

2253

"disabling client {0} - Client "

2413

2254

"last checker failed with error code {1}"

2414

.format(client_name,

2255

.format(client["name"],

2415

2256

client["last_checker_status"]))

2416

2257

client["enabled"] = False

2417

2258

else:

2418

2259

client["expires"] = (datetime.datetime

2419

2260

.utcnow()

2420

2261

+ client["timeout"])

2421

logger.debug("Last checker succeeded,"

2422

" keeping {0} enabled"

2423

.format(client_name))

2262

2424

2263

try:

2425

2264

client["secret"] = (

2426

2265

pgp.decrypt(client["encrypted_secret"],

2432

2271

.format(client_name))

2433

2272

client["secret"] = (

2434

2273

client_settings[client_name]["secret"])

2274

2435

2275

2436

2276

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

2437

for client_name in (set(old_client_settings)

2438

- set(client_settings)):

2277

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

2439

2278

del clients_data[client_name]

2440

for client_name in (set(client_settings)

2441

- set(old_client_settings)):

2279

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

2442

2280

clients_data[client_name] = client_settings[client_name]

2443

2444

# Create all client objects

2281

2282

# Create clients all clients

2445

2283

for client_name, client in clients_data.iteritems():

2446

2284

tcp_server.clients[client_name] = client_class(

2447

2285

name = client_name, settings = client)

2448

2286

2449

2287

if not tcp_server.clients:

2450

2288

logger.warning("No clients defined")

2451

2289

2452

2290

if not debug:

2453

2291

try:

2454

2292

with pidfile:

2462

2300

# "pidfile" was never created

2463

2301

pass

2464

2302

del pidfilename

2303

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

2465

2304

2466

2305

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

2467

2306

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

2468

2307

2469

2308

if use_dbus:

2470

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

2471

"se.bsnet.fukt.Mandos"})

2472

class MandosDBusService(DBusObjectWithProperties):

2309

class MandosDBusService(dbus.service.Object):

2473

2310

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

2474

2311

def __init__(self):

2475

2312

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

2476

2313

_interface = "se.recompile.Mandos"

2477

2314

2478

@dbus_interface_annotations(_interface)

2479

def _foo(self):

2480

return { "org.freedesktop.DBus.Property"

2481

".EmitsChangedSignal":

2482

"false"}

2483

2484

2315

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

2485

2316

def ClientAdded(self, objpath):

2486

2317

"D-Bus signal"

2528

2359

2529

2360

del _interface

2530

2361

2531

mandos_dbus_service = MandosDBusService()

2362

class MandosDBusServiceTransitional(MandosDBusService):

2363

__metaclass__ = AlternateDBusNamesMetaclass

2364

mandos_dbus_service = MandosDBusServiceTransitional()

2532

2365

2533

2366

def cleanup():

2534

2367

"Cleanup function; run on exit"

2567

2400

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

2568

2401

2569

2402

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:

2403

with os.fdopen(os.open(stored_state_path,

2404

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

2405

0600), "wb") as stored_state:

2574

2406

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

2575

tempname=stored_state.name

2576

os.rename(tempname, stored_state_path)

2577

2407

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

2408

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

2409

.format(e))

2410

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

2411

raise

2590

2412

2591

2413

# Delete all clients, and settings from config

2592

2414

while tcp_server.clients:

2619

2441

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

2620

2442

if use_ipv6:

2621

2443

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

2622

" flowinfo %d, scope_id %d",

2623

*tcp_server.socket.getsockname())

2444

" flowinfo %d, scope_id %d"

2445

% tcp_server.socket.getsockname())

2624

2446

else: # IPv4

2625

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

2626

*tcp_server.socket.getsockname())

2447

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

2448

% tcp_server.socket.getsockname())

2627

2449

2628

2450

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

2629

2451

2632

2454

try:

2633

2455

service.activate()

2634

2456

except dbus.exceptions.DBusException as error:

2635

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

2457

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

2636

2458

cleanup()

2637

2459

sys.exit(1)

2638

2460

# End of Avahi example code

2645

2467

logger.debug("Starting main loop")

2646

2468

main_loop.run()

2647

2469

except AvahiError as error:

2648

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

2470

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

2649

2471

cleanup()

2650

2472

sys.exit(1)

2651

2473

except KeyboardInterrupt: