/mandos/trunk : revision 518.2.7

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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 collections

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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 = "1.6.0"

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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checker, or None.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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"""

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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": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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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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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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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 = config.get("enabled", True)

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self.last_approval_request = None

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if self.enabled:

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self.last_enabled = datetime.datetime.utcnow()

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else:

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self.last_enabled = None

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self.last_checked_ok = None

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self.last_checker_status = None

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

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self.extended_timeout = string_to_delta(config

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["extended_timeout"])

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

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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if self.enabled:

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

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else:

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self.expires = None

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

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self.current_checker_command = None

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self.approved = None

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self.approved_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()))

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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

601

if not quiet:

602

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.

612

if self.checker_initiator_tag is not None:

613

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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self.checker_callback_tag = None

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self.checker = None

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if os.WIFEXITED(condition):

631

self.last_checker_status = os.WEXITSTATUS(condition)

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self.last_checker_status = os.WEXITSTATUS(condition)

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if self.last_checker_status == 0:

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

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vars(self))

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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.

597

"""

652

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if timeout is None:

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timeout = self.timeout

600

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

672

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

673

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

674

# would inevitably timeout, since no checker would get a

675

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

618

# 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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622

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

677

623

# 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:

695

# Escape attributes for the shell

696

escaped_attrs = dict(

697

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

698

for attr in

699

self.runtime_expansions)

700

641

try:

701

command = self.checker_command % escaped_attrs

702

except TypeError as error:

703

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

704

self.checker_command, exc_info=error)

705

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

644

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, "")),

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errors=

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'replace')))

651

for attr in

652

self.runtime_expansions)

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try:

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command = self.checker_command % escaped_attrs

656

except TypeError as error:

657

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

658

' %s', self.checker_command, error)

659

return True # Try again later

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self.current_checker_command = command

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661

try:

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662

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

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668

self.checker = subprocess.Popen(command,

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669

close_fds=True,

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670

shell=True, cwd="/")

671

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.

677

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

678

if pid:

679

gobject.source_remove(self.checker_callback_tag)

680

self.checker_callback(pid, status, command)

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except OSError as error:

718

logger.error("Failed to start subprocess",

719

exc_info=error)

720

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

725

# watch was added. Check for this.

726

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

727

if pid:

728

gobject.source_remove(self.checker_callback_tag)

729

self.checker_callback(pid, status, command)

682

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

683

error)

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

731

685

return True

732

686

739

693

return

740

694

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

741

695

try:

742

self.checker.terminate()

696

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

743

697

#time.sleep(0.5)

744

698

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

745

# self.checker.kill()

699

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

746

700

except OSError as error:

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701

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

748

702

raise

765

719

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

766

720

if byte_arrays and signature != "ay":

767

721

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

768

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

722

" signature %r" % signature)

769

723

def decorator(func):

770

724

func._dbus_is_property = True

771

725

func._dbus_interface = dbus_interface

779

733

return decorator

780

734

781

735

782

def dbus_interface_annotations(dbus_interface):

783

"""Decorator for marking functions returning interface annotations

784

785

Usage:

786

787

@dbus_interface_annotations("org.example.Interface")

788

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

789

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

790

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

791

"false"}

792

"""

793

def decorator(func):

794

func._dbus_is_interface = True

795

func._dbus_interface = dbus_interface

796

func._dbus_name = dbus_interface

797

return func

798

return decorator

799

800

801

def dbus_annotations(annotations):

802

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

803

Usage:

804

805

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

806

access="r")

807

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

808

"org.freedesktop.DBus.Property."

809

"EmitsChangedSignal": "false"})

810

def Property_dbus_property(self):

811

return dbus.Boolean(False)

812

"""

813

def decorator(func):

814

func._dbus_annotations = annotations

815

return func

816

return decorator

817

818

819

736

class DBusPropertyException(dbus.exceptions.DBusException):

820

737

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

821

738

"""

844

761

"""

845

762

846

763

@staticmethod

847

def _is_dbus_thing(thing):

848

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

849

850

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

851

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

852

"""

853

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

854

False)

764

def _is_dbus_property(obj):

765

return getattr(obj, "_dbus_is_property", False)

855

766

856

def _get_all_dbus_things(self, thing):

767

def _get_all_dbus_properties(self):

857

768

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

858

769

"""

859

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

860

name),

861

athing.__get__(self))

770

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

862

771

for cls in self.__class__.__mro__

863

for name, athing in

864

inspect.getmembers(cls,

865

self._is_dbus_thing(thing)))

772

for name, prop in

773

inspect.getmembers(cls, self._is_dbus_property))

866

774

867

775

def _get_dbus_property(self, interface_name, property_name):

868

776

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

870

778

"""

871

779

for cls in self.__class__.__mro__:

872

780

for name, value in (inspect.getmembers

873

(cls,

874

self._is_dbus_thing("property"))):

781

(cls, self._is_dbus_property)):

875

782

if (value._dbus_name == property_name

876

783

and value._dbus_interface == interface_name):

877

784

return value.__get__(self)

906

813

# signatures other than "ay".

907

814

if prop._dbus_signature != "ay":

908

815

raise ValueError

909

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

910

for byte in value))

816

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

817

for byte in value))

911

818

prop(value)

912

819

913

820

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

919

826

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

920

827

"""

921

828

properties = {}

922

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

829

for name, prop in self._get_all_dbus_properties():

923

830

if (interface_name

924

831

and interface_name != prop._dbus_interface):

925

832

# Interface non-empty but did not match

940

847

path_keyword='object_path',

941

848

connection_keyword='connection')

942

849

def Introspect(self, object_path, connection):

943

"""Overloading of standard D-Bus method.

944

945

Inserts property tags and interface annotation tags.

850

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

946

851

"""

947

852

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

948

853

connection)

955

860

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

956

861

return e

957

862

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

958

# Add property tags

959

863

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

960

864

for name, prop

961

in self._get_all_dbus_things("property")

865

in self._get_all_dbus_properties()

962

866

if prop._dbus_interface

963

867

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

964

868

if_tag.appendChild(tag)

965

# Add annotation tags

966

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

967

for tag in if_tag.getElementsByTagName(typ):

968

annots = dict()

969

for name, prop in (self.

970

_get_all_dbus_things(typ)):

971

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

972

and prop._dbus_interface

973

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

974

annots.update(getattr

975

(prop,

976

"_dbus_annotations",

977

{}))

978

for name, value in annots.iteritems():

979

ann_tag = document.createElement(

980

"annotation")

981

ann_tag.setAttribute("name", name)

982

ann_tag.setAttribute("value", value)

983

tag.appendChild(ann_tag)

984

# Add interface annotation tags

985

for annotation, value in dict(

986

itertools.chain.from_iterable(

987

annotations().iteritems()

988

for name, annotations in

989

self._get_all_dbus_things("interface")

990

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

991

)).iteritems():

992

ann_tag = document.createElement("annotation")

993

ann_tag.setAttribute("name", annotation)

994

ann_tag.setAttribute("value", value)

995

if_tag.appendChild(ann_tag)

996

869

# Add the names to the return values for the

997

870

# "org.freedesktop.DBus.Properties" methods

998

871

if (if_tag.getAttribute("name")

1013

886

except (AttributeError, xml.dom.DOMException,

1014

887

xml.parsers.expat.ExpatError) as error:

1015

888

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

1016

exc_info=error)

889

error)

1017

890

return xmlstring

1018

891

1019

892

1020

def datetime_to_dbus(dt, variant_level=0):

893

def datetime_to_dbus (dt, variant_level=0):

1021

894

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

1022

895

if dt is None:

1023

896

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

1025

898

variant_level=variant_level)

1026

899

1027

900

1028

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1029

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

1030

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

1031

interface names according to the "alt_interface_names" mapping.

1032

Usage:

1033

1034

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

1035

"net.example.AlternateInterface"})

1036

class SampleDBusObject(dbus.service.Object):

1037

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

1038

def SampleDBusMethod():

1039

pass

1040

1041

The above "SampleDBusMethod" on "SampleDBusObject" will be

1042

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

1043

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

1044

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

1045

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

1046

1047

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

1048

(from DBusObjectWithProperties) and interfaces (from the

1049

dbus_interface_annotations decorator).

901

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

902

.__metaclass__):

903

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

904

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

1050

905

"""

1051

def wrapper(cls):

1052

for orig_interface_name, alt_interface_name in (

1053

alt_interface_names.iteritems()):

1054

attr = {}

1055

interface_names = set()

1056

# Go though all attributes of the class

1057

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

906

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

907

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

908

# methods, signals, or properties in them

909

for base in (b for b in bases

910

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

911

# Go though all attributes of the base class

912

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

1058

913

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

1059

914

# with the wrong interface name

1060

915

if (not hasattr(attribute, "_dbus_interface")

1061

916

or not attribute._dbus_interface

1062

.startswith(orig_interface_name)):

917

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

1063

918

continue

1064

919

# Create an alternate D-Bus interface name based on

1065

920

# the current name

1066

921

alt_interface = (attribute._dbus_interface

1067

.replace(orig_interface_name,

1068

alt_interface_name))

1069

interface_names.add(alt_interface)

922

.replace("se.recompile.Mandos",

923

"se.bsnet.fukt.Mandos"))

1070

924

# Is this a D-Bus signal?

1071

925

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

1072

926

# Extract the original non-method function by

1087

941

nonmethod_func.func_name,

1088

942

nonmethod_func.func_defaults,

1089

943

nonmethod_func.func_closure)))

1090

# Copy annotations, if any

1091

try:

1092

new_function._dbus_annotations = (

1093

dict(attribute._dbus_annotations))

1094

except AttributeError:

1095

pass

1096

944

# Define a creator of a function to call both the

1097

# original and alternate functions, so both the

1098

# original and alternate signals gets sent when

1099

# the function is called

945

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

946

# signals gets sent when the function is called

1100

947

def fixscope(func1, func2):

1101

948

"""This function is a scope container to pass

1102

949

func1 and func2 to the "call_both" function

1109

956

return call_both

1110

957

# Create the "call_both" function and add it to

1111

958

# the class

1112

attr[attrname] = fixscope(attribute, new_function)

959

attr[attrname] = fixscope(attribute,

960

new_function)

1113

961

# Is this a D-Bus method?

1114

962

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

1115

963

# Create a new, but exactly alike, function

1126

974

attribute.func_name,

1127

975

attribute.func_defaults,

1128

976

attribute.func_closure)))

1129

# Copy annotations, if any

1130

try:

1131

attr[attrname]._dbus_annotations = (

1132

dict(attribute._dbus_annotations))

1133

except AttributeError:

1134

pass

1135

977

# Is this a D-Bus property?

1136

978

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

1137

979

# Create a new, but exactly alike, function

1151

993

attribute.func_name,

1152

994

attribute.func_defaults,

1153

995

attribute.func_closure)))

1154

# Copy annotations, if any

1155

try:

1156

attr[attrname]._dbus_annotations = (

1157

dict(attribute._dbus_annotations))

1158

except AttributeError:

1159

pass

1160

# Is this a D-Bus interface?

1161

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

1162

# Create a new, but exactly alike, function

1163

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

1164

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

1165

# to the class.

1166

attr[attrname] = (dbus_interface_annotations

1167

(alt_interface)

1168

(types.FunctionType

1169

(attribute.func_code,

1170

attribute.func_globals,

1171

attribute.func_name,

1172

attribute.func_defaults,

1173

attribute.func_closure)))

1174

if deprecate:

1175

# Deprecate all alternate interfaces

1176

iname="_AlternateDBusNames_interface_annotation{0}"

1177

for interface_name in interface_names:

1178

@dbus_interface_annotations(interface_name)

1179

def func(self):

1180

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

1181

"true" }

1182

# Find an unused name

1183

for aname in (iname.format(i)

1184

for i in itertools.count()):

1185

if aname not in attr:

1186

attr[aname] = func

1187

break

1188

if interface_names:

1189

# Replace the class with a new subclass of it with

1190

# methods, signals, etc. as created above.

1191

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

1192

(cls,), attr)

1193

return cls

1194

return wrapper

1195

1196

1197

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

1198

"se.bsnet.fukt.Mandos"})

996

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

997

998

1199

999

class ClientDBus(Client, DBusObjectWithProperties):

1200

1000

"""A Client class using D-Bus

1201

1001

1212

1012

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

1213

1013

self.bus = bus

1214

1014

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

1015

1016

self._approvals_pending = 0

1215

1017

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

1216

1018

# the D-Bus

1217

1019

client_object_name = unicode(self.name).translate(

1221

1023

("/clients/" + client_object_name))

1222

1024

DBusObjectWithProperties.__init__(self, self.bus,

1223

1025

self.dbus_object_path)

1224

1026

1225

1027

def notifychangeproperty(transform_func,

1226

1028

dbus_name, type_func=lambda x: x,

1227

1029

variant_level=1):

1250

1052

1251

1053

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

1252

1054

1055

1253

1056

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1254

1057

approvals_pending = notifychangeproperty(dbus.Boolean,

1255

1058

"ApprovalPending",

1262

1065

checker is not None)

1263

1066

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1264

1067

"LastCheckedOK")

1265

last_checker_status = notifychangeproperty(dbus.Int16,

1266

"LastCheckerStatus")

1267

1068

last_approval_request = notifychangeproperty(

1268

1069

datetime_to_dbus, "LastApprovalRequest")

1269

1070

approved_by_default = notifychangeproperty(dbus.Boolean,

1270

1071

"ApprovedByDefault")

1271

approval_delay = notifychangeproperty(dbus.UInt64,

1072

approval_delay = notifychangeproperty(dbus.UInt16,

1272

1073

"ApprovalDelay",

1273

1074

type_func =

1274

1075

timedelta_to_milliseconds)

1275

1076

approval_duration = notifychangeproperty(

1276

dbus.UInt64, "ApprovalDuration",

1077

dbus.UInt16, "ApprovalDuration",

1277

1078

type_func = timedelta_to_milliseconds)

1278

1079

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

1279

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

1080

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

1280

1081

type_func =

1281

1082

timedelta_to_milliseconds)

1282

1083

extended_timeout = notifychangeproperty(

1283

dbus.UInt64, "ExtendedTimeout",

1084

dbus.UInt16, "ExtendedTimeout",

1284

1085

type_func = timedelta_to_milliseconds)

1285

interval = notifychangeproperty(dbus.UInt64,

1086

interval = notifychangeproperty(dbus.UInt16,

1286

1087

"Interval",

1287

1088

type_func =

1288

1089

timedelta_to_milliseconds)

1337

1138

return False

1338

1139

1339

1140

def approve(self, value=True):

1141

self.send_changedstate()

1340

1142

self.approved = value

1341

1143

gobject.timeout_add(timedelta_to_milliseconds

1342

1144

(self.approval_duration),

1343

1145

self._reset_approved)

1344

self.send_changedstate()

1146

1345

1147

1346

1148

## D-Bus methods, signals & properties

1347

1149

_interface = "se.recompile.Mandos.Client"

1348

1150

1349

## Interfaces

1350

1351

@dbus_interface_annotations(_interface)

1352

def _foo(self):

1353

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

1354

"false"}

1355

1356

1151

## Signals

1357

1152

1358

1153

# CheckerCompleted - signal

1394

1189

"D-Bus signal"

1395

1190

return self.need_approval()

1396

1191

1192

# NeRwequest - signal

1193

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

1194

def NewRequest(self, ip):

1195

"""D-Bus signal

1196

Is sent after a client request a password.

1197

"""

1198

pass

1199

1397

1200

## Methods

1398

1201

1399

1202

# Approve - method

1477

1280

def Host_dbus_property(self, value=None):

1478

1281

if value is None: # get

1479

1282

return dbus.String(self.host)

1480

self.host = unicode(value)

1283

self.host = value

1481

1284

1482

1285

# Created - property

1483

1286

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

1509

1312

return

1510

1313

return datetime_to_dbus(self.last_checked_ok)

1511

1314

1512

# LastCheckerStatus - property

1513

@dbus_service_property(_interface, signature="n",

1514

access="read")

1515

def LastCheckerStatus_dbus_property(self):

1516

return dbus.Int16(self.last_checker_status)

1517

1518

1315

# Expires - property

1519

1316

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

1520

1317

def Expires_dbus_property(self):

1531

1328

def Timeout_dbus_property(self, value=None):

1532

1329

if value is None: # get

1533

1330

return dbus.UInt64(self.timeout_milliseconds())

1534

old_timeout = self.timeout

1535

1331

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

1536

# Reschedule disabling

1537

if self.enabled:

1538

now = datetime.datetime.utcnow()

1539

self.expires += self.timeout - old_timeout

1540

if self.expires <= now:

1541

# The timeout has passed

1542

self.disable()

1543

else:

1544

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

1545

is None):

1546

return

1547

gobject.source_remove(self.disable_initiator_tag)

1548

self.disable_initiator_tag = (

1549

gobject.timeout_add(

1550

timedelta_to_milliseconds(self.expires - now),

1551

self.disable))

1332

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

1333

return

1334

# Reschedule timeout

1335

gobject.source_remove(self.disable_initiator_tag)

1336

self.disable_initiator_tag = None

1337

self.expires = None

1338

time_to_die = timedelta_to_milliseconds((self

1339

.last_checked_ok

1340

+ self.timeout)

1341

- datetime.datetime

1342

.utcnow())

1343

if time_to_die <= 0:

1344

# The timeout has passed

1345

self.disable()

1346

else:

1347

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

1348

+ datetime.timedelta(milliseconds =

1349

time_to_die))

1350

self.disable_initiator_tag = (gobject.timeout_add

1351

(time_to_die, self.disable))

1552

1352

1553

1353

# ExtendedTimeout - property

1554

1354

@dbus_service_property(_interface, signature="t",

1580

1380

def Checker_dbus_property(self, value=None):

1581

1381

if value is None: # get

1582

1382

return dbus.String(self.checker_command)

1583

self.checker_command = unicode(value)

1383

self.checker_command = value

1584

1384

1585

1385

# CheckerRunning - property

1586

1386

@dbus_service_property(_interface, signature="b",

1633

1433

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

1634

1434

1635

1435

1436

class ClientDBusTransitional(ClientDBus):

1437

__metaclass__ = AlternateDBusNamesMetaclass

1438

1439

1636

1440

class ClientHandler(socketserver.BaseRequestHandler, object):

1637

1441

"""A class to handle client connections.

1638

1442

1706

1510

except KeyError:

1707

1511

return

1708

1512

1513

if self.server.use_dbus:

1514

# Emit D-Bus signal

1515

client.NewRequest(str(self.client_address))

1516

1709

1517

if client.approval_delay:

1710

1518

delay = client.approval_delay

1711

1519

client.approvals_pending += 1

1742

1550

#wait until timeout or approved

1743

1551

time = datetime.datetime.now()

1744

1552

client.changedstate.acquire()

1745

client.changedstate.wait(

1746

float(timedelta_to_milliseconds(delay)

1747

/ 1000))

1553

(client.changedstate.wait

1554

(float(client.timedelta_to_milliseconds(delay)

1555

/ 1000)))

1748

1556

client.changedstate.release()

1749

1557

time2 = datetime.datetime.now()

1750

1558

if (time2 - time) >= delay:

1766

1574

try:

1767

1575

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

1768

1576

except gnutls.errors.GNUTLSError as error:

1769

logger.warning("gnutls send failed",

1770

exc_info=error)

1577

logger.warning("gnutls send failed")

1771

1578

return

1772

1579

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

1773

1580

sent, len(client.secret)

1776

1583

1777

1584

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

1778

1585

# bump the timeout using extended_timeout

1779

client.bump_timeout(client.extended_timeout)

1586

client.checked_ok(client.extended_timeout)

1780

1587

if self.server.use_dbus:

1781

1588

# Emit D-Bus signal

1782

1589

client.GotSecret()

1787

1594

try:

1788

1595

session.bye()

1789

1596

except gnutls.errors.GNUTLSError as error:

1790

logger.warning("GnuTLS bye failed",

1791

exc_info=error)

1597

logger.warning("GnuTLS bye failed")

1792

1598

1793

1599

@staticmethod

1794

1600

def peer_certificate(session):

1859

1665

def sub_process_main(self, request, address):

1860

1666

try:

1861

1667

self.finish_request(request, address)

1862

except Exception:

1668

except:

1863

1669

self.handle_error(request, address)

1864

1670

self.close_request(request)

1865

1671

1866

1672

def process_request(self, request, address):

1867

1673

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

1868

1674

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

1869

args = (request, address))

1675

args = (request,

1676

address))

1870

1677

proc.start()

1871

1678

return proc

1872

1679

1900

1707

use_ipv6: Boolean; to use IPv6 or not

1901

1708

"""

1902

1709

def __init__(self, server_address, RequestHandlerClass,

1903

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

1904

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

1905

creating a new one with socket.socket().

1906

"""

1710

interface=None, use_ipv6=True):

1907

1711

self.interface = interface

1908

1712

if use_ipv6:

1909

1713

self.address_family = socket.AF_INET6

1910

if socketfd is not None:

1911

# Save the file descriptor

1912

self.socketfd = socketfd

1913

# Save the original socket.socket() function

1914

self.socket_socket = socket.socket

1915

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

1916

#

1917

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

1918

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

1919

# patching socket.socket.)

1920

#

1921

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

1922

@functools.wraps(socket.socket)

1923

def socket_wrapper(*args, **kwargs):

1924

# Restore original function so subsequent calls are

1925

# not affected.

1926

socket.socket = self.socket_socket

1927

del self.socket_socket

1928

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

1929

# saved file descriptor.

1930

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

1931

# Replace socket.socket() function with wrapper

1932

socket.socket = socket_wrapper

1933

# The socketserver.TCPServer.__init__ will call

1934

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

1935

# socket_wrapper(), if socketfd was set.

1936

1714

socketserver.TCPServer.__init__(self, server_address,

1937

1715

RequestHandlerClass)

1938

1939

1716

def server_bind(self):

1940

1717

"""This overrides the normal server_bind() function

1941

1718

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

1949

1726

try:

1950

1727

self.socket.setsockopt(socket.SOL_SOCKET,

1951

1728

SO_BINDTODEVICE,

1952

str(self.interface + '\0'))

1729

str(self.interface

1730

+ '\0'))

1953

1731

except socket.error as error:

1954

if error.errno == errno.EPERM:

1955

logger.error("No permission to bind to"

1956

" interface %s", self.interface)

1957

elif error.errno == errno.ENOPROTOOPT:

1732

if error[0] == errno.EPERM:

1733

logger.error("No permission to"

1734

" bind to interface %s",

1735

self.interface)

1736

elif error[0] == errno.ENOPROTOOPT:

1958

1737

logger.error("SO_BINDTODEVICE not available;"

1959

1738

" cannot bind to interface %s",

1960

1739

self.interface)

1961

elif error.errno == errno.ENODEV:

1962

logger.error("Interface %s does not exist,"

1963

" cannot bind", self.interface)

1964

1740

else:

1965

1741

raise

1966

1742

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

1996

1772

"""

1997

1773

def __init__(self, server_address, RequestHandlerClass,

1998

1774

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

1999

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

1775

gnutls_priority=None, use_dbus=True):

2000

1776

self.enabled = False

2001

1777

self.clients = clients

2002

1778

if self.clients is None:

2006

1782

IPv6_TCPServer.__init__(self, server_address,

2007

1783

RequestHandlerClass,

2008

1784

interface = interface,

2009

use_ipv6 = use_ipv6,

2010

socketfd = socketfd)

1785

use_ipv6 = use_ipv6)

2011

1786

def server_activate(self):

2012

1787

if self.enabled:

2013

1788

return socketserver.TCPServer.server_activate(self)

2026

1801

2027

1802

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

2028

1803

proc = None, client_object=None):

1804

condition_names = {

1805

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

1806

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

1807

# blocking).

1808

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

1809

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

1810

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

1811

# broken, usually for pipes and

1812

# sockets).

1813

}

1814

conditions_string = ' | '.join(name

1815

for cond, name in

1816

condition_names.iteritems()

1817

if cond & condition)

2029

1818

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

2030

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

1819

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

2031

1820

# Wait for other process to exit

2032

1821

proc.join()

2033

1822

return False

2091

1880

return True

2092

1881

2093

1882

2094

def rfc3339_duration_to_delta(duration):

2095

"""Parse an RFC 3339 "duration" and return a datetime.timedelta

2096

2097

>>> rfc3339_duration_to_delta("P7D")

2098

datetime.timedelta(7)

2099

>>> rfc3339_duration_to_delta("PT60S")

2100

datetime.timedelta(0, 60)

2101

>>> rfc3339_duration_to_delta("PT60M")

2102

datetime.timedelta(0, 3600)

2103

>>> rfc3339_duration_to_delta("PT24H")

2104

datetime.timedelta(1)

2105

>>> rfc3339_duration_to_delta("P1W")

2106

datetime.timedelta(7)

2107

>>> rfc3339_duration_to_delta("PT5M30S")

2108

datetime.timedelta(0, 330)

2109

>>> rfc3339_duration_to_delta("P1DT3M20S")

2110

datetime.timedelta(1, 200)

2111

"""

2112

2113

# Parsing an RFC 3339 duration with regular expressions is not

2114

# possible - there would have to be multiple places for the same

2115

# values, like seconds. The current code, while more esoteric, is

2116

# cleaner without depending on a parsing library. If Python had a

2117

# built-in library for parsing we would use it, but we'd like to

2118

# avoid excessive use of external libraries.

2119

2120

# New type for defining tokens, syntax, and semantics all-in-one

2121

Token = collections.namedtuple("Token",

2122

("regexp", # To match token; if

2123

# "value" is not None,

2124

# must have a "group"

2125

# containing digits

2126

"value", # datetime.timedelta or

2127

# None

2128

"followers")) # Tokens valid after

2129

# this token

2130

# RFC 3339 "duration" tokens, syntax, and semantics; taken from

2131

# the "duration" ABNF definition in RFC 3339, Appendix A.

2132

token_end = Token(re.compile(r"$"), None, frozenset())

2133

token_second = Token(re.compile(r"(\d+)S"),

2134

datetime.timedelta(seconds=1),

2135

frozenset((token_end,)))

2136

token_minute = Token(re.compile(r"(\d+)M"),

2137

datetime.timedelta(minutes=1),

2138

frozenset((token_second, token_end)))

2139

token_hour = Token(re.compile(r"(\d+)H"),

2140

datetime.timedelta(hours=1),

2141

frozenset((token_minute, token_end)))

2142

token_time = Token(re.compile(r"T"),

2143

None,

2144

frozenset((token_hour, token_minute,

2145

token_second)))

2146

token_day = Token(re.compile(r"(\d+)D"),

2147

datetime.timedelta(days=1),

2148

frozenset((token_time, token_end)))

2149

token_month = Token(re.compile(r"(\d+)M"),

2150

datetime.timedelta(weeks=4),

2151

frozenset((token_day, token_end)))

2152

token_year = Token(re.compile(r"(\d+)Y"),

2153

datetime.timedelta(weeks=52),

2154

frozenset((token_month, token_end)))

2155

token_week = Token(re.compile(r"(\d+)W"),

2156

datetime.timedelta(weeks=1),

2157

frozenset((token_end,)))

2158

token_duration = Token(re.compile(r"P"), None,

2159

frozenset((token_year, token_month,

2160

token_day, token_time,

2161

token_week))),

2162

# Define starting values

2163

value = datetime.timedelta() # Value so far

2164

found_token = None

2165

followers = frozenset(token_duration,) # Following valid tokens

2166

s = duration # String left to parse

2167

# Loop until end token is found

2168

while found_token is not token_end:

2169

# Search for any currently valid tokens

2170

for token in followers:

2171

match = token.regexp.match(s)

2172

if match is not None:

2173

# Token found

2174

if token.value is not None:

2175

# Value found, parse digits

2176

factor = int(match.group(1), 10)

2177

# Add to value so far

2178

value += factor * token.value

2179

# Strip token from string

2180

s = token.regexp.sub("", s, 1)

2181

# Go to found token

2182

found_token = token

2183

# Set valid next tokens

2184

followers = found_token.followers

2185

break

2186

else:

2187

# No currently valid tokens were found

2188

raise ValueError("Invalid RFC 3339 duration")

2189

# End token found

2190

return value

2191

2192

2193

1883

def string_to_delta(interval):

2194

1884

"""Parse a string and return a datetime.timedelta

2195

1885

2206

1896

>>> string_to_delta('5m 30s')

2207

1897

datetime.timedelta(0, 330)

2208

1898

"""

2209

2210

try:

2211

return rfc3339_duration_to_delta(interval)

2212

except ValueError:

2213

pass

2214

2215

1899

timevalue = datetime.timedelta(0)

2216

1900

for s in interval.split():

2217

1901

try:

2228

1912

elif suffix == "w":

2229

1913

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

2230

1914

else:

2231

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

2232

.format(suffix))

1915

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

2233

1916

except (ValueError, IndexError) as e:

2234

1917

raise ValueError(*(e.args))

2235

1918

timevalue += delta

2249

1932

sys.exit()

2250

1933

if not noclose:

2251

1934

# Close all standard open file descriptors

2252

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

1935

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

2253

1936

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

2254

1937

raise OSError(errno.ENODEV,

2255

"{0} not a character device"

2256

.format(os.devnull))

1938

"%s not a character device"

1939

% os.path.devnull)

2257

1940

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

2258

1941

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

2259

1942

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

2268

1951

2269

1952

parser = argparse.ArgumentParser()

2270

1953

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

2271

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

1954

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

2272

1955

help="show version number and exit")

2273

1956

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

2274

1957

help="Bind to interface IF")

2299

1982

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

2300

1983

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

2301

1984

" state")

2302

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

2303

help="Specify a file descriptor to a network"

2304

" socket to use instead of creating one")

2305

1985

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

2306

1986

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

2307

parser.add_argument("--foreground", action="store_true",

2308

help="Run in foreground")

2309

1987

2310

1988

options = parser.parse_args()

2311

1989

2326

2004

"use_ipv6": "True",

2327

2005

"debuglevel": "",

2328

2006

"restore": "True",

2329

"socket": "",

2330

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

2331

"foreground": "False",

2007

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

2332

2008

}

2333

2009

2334

2010

# Parse config file for server-global settings

2339

2015

# Convert the SafeConfigParser object to a dict

2340

2016

server_settings = server_config.defaults()

2341

2017

# Use the appropriate methods on the non-string config options

2342

for option in ("debug", "use_dbus", "use_ipv6", "foreground"):

2018

for option in ("debug", "use_dbus", "use_ipv6"):

2343

2019

server_settings[option] = server_config.getboolean("DEFAULT",

2344

2020

option)

2345

2021

if server_settings["port"]:

2346

2022

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

2347

2023

"port")

2348

if server_settings["socket"]:

2349

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

2350

"socket")

2351

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

2352

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

2353

# happen with a supplied network socket.

2354

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

2355

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

2356

["socket"])

2357

2024

del server_config

2358

2025

2359

2026

# Override the settings from the config file with command line

2361

2028

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

2362

2029

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

2363

2030

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

2364

"statedir", "socket", "foreground"):

2031

"statedir"):

2365

2032

value = getattr(options, option)

2366

2033

if value is not None:

2367

2034

server_settings[option] = value

2370

2037

for option in server_settings.keys():

2371

2038

if type(server_settings[option]) is str:

2372

2039

server_settings[option] = unicode(server_settings[option])

2373

# Debug implies foreground

2374

if server_settings["debug"]:

2375

server_settings["foreground"] = True

2376

2040

# Now we have our good server settings in "server_settings"

2377

2041

2378

2042

##################################################################

2384

2048

use_ipv6 = server_settings["use_ipv6"]

2385

2049

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

2386

2050

stored_state_file)

2387

foreground = server_settings["foreground"]

2388

2051

2389

2052

if debug:

2390

initlogger(debug, logging.DEBUG)

2053

initlogger(logging.DEBUG)

2391

2054

else:

2392

2055

if not debuglevel:

2393

initlogger(debug)

2056

initlogger()

2394

2057

else:

2395

2058

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

2396

initlogger(debug, level)

2059

initlogger(level)

2397

2060

2398

2061

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

2399

2062

syslogger.setFormatter(logging.Formatter

2400

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

2401

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

2402

.format(server_settings

2403

["servicename"])))

2063

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

2064

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

2065

% server_settings["servicename"]))

2404

2066

2405

2067

# Parse config file with clients

2406

client_config = configparser.SafeConfigParser(Client

2407

.client_defaults)

2068

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

2069

"extended_timeout": "15m",

2070

"interval": "2m",

2071

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

2072

"host": "",

2073

"approval_delay": "0s",

2074

"approval_duration": "1s",

2075

}

2076

client_config = configparser.SafeConfigParser(client_defaults)

2408

2077

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

2409

2078

"clients.conf"))

2410

2079

2419

2088

use_ipv6=use_ipv6,

2420

2089

gnutls_priority=

2421

2090

server_settings["priority"],

2422

use_dbus=use_dbus,

2423

socketfd=(server_settings["socket"]

2424

or None))

2425

if not foreground:

2091

use_dbus=use_dbus)

2092

if not debug:

2426

2093

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

2427

pidfile = None

2428

2094

try:

2429

2095

pidfile = open(pidfilename, "w")

2430

except IOError as e:

2431

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

2432

exc_info=e)

2096

except IOError:

2097

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

2433

2098

2434

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

2099

try:

2100

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

2101

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

2102

except KeyError:

2435

2103

try:

2436

uid = pwd.getpwnam(name).pw_uid

2437

gid = pwd.getpwnam(name).pw_gid

2438

break

2104

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

2105

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

2439

2106

except KeyError:

2440

continue

2441

else:

2442

uid = 65534

2443

gid = 65534

2107

try:

2108

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

2109

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

2110

except KeyError:

2111

uid = 65534

2112

gid = 65534

2444

2113

try:

2445

2114

os.setgid(gid)

2446

2115

os.setuid(uid)

2447

2116

except OSError as error:

2448

if error.errno != errno.EPERM:

2117

if error[0] != errno.EPERM:

2449

2118

raise error

2450

2119

2451

2120

if debug:

2463

2132

.gnutls_global_set_log_function(debug_gnutls))

2464

2133

2465

2134

# Redirect stdin so all checkers get /dev/null

2466

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

2135

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

2467

2136

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

2468

2137

if null > 2:

2469

2138

os.close(null)

2139

else:

2140

# No console logging

2141

logger.removeHandler(console)

2470

2142

2471

2143

# Need to fork before connecting to D-Bus

2472

if not foreground:

2144

if not debug:

2473

2145

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

2474

2146

daemon()

2475

2147

2476

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

2477

# need to inform gobject that threads will be used.

2478

gobject.threads_init()

2479

2480

2148

global main_loop

2481

2149

# From the Avahi example code

2482

DBusGMainLoop(set_as_default=True)

2150

DBusGMainLoop(set_as_default=True )

2483

2151

main_loop = gobject.MainLoop()

2484

2152

bus = dbus.SystemBus()

2485

2153

# End of Avahi example code

2491

2159

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

2492

2160

do_not_queue=True))

2493

2161

except dbus.exceptions.NameExistsException as e:

2494

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

2162

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

2495

2163

use_dbus = False

2496

2164

server_settings["use_dbus"] = False

2497

2165

tcp_server.use_dbus = False

2509

2177

2510

2178

client_class = Client

2511

2179

if use_dbus:

2512

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

2513

2514

client_settings = Client.config_parser(client_config)

2180

client_class = functools.partial(ClientDBusTransitional,

2181

bus = bus)

2182

2183

special_settings = {

2184

# Some settings need to be accessd by special methods;

2185

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

2186

"approved_by_default":

2187

lambda section:

2188

client_config.getboolean(section, "approved_by_default"),

2189

"enabled":

2190

lambda section:

2191

client_config.getboolean(section, "enabled"),

2192

}

2193

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

2194

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

2195

# with exceptions for any special settings as defined above

2196

client_settings = dict((clientname,

2197

dict((setting,

2198

(value

2199

if setting not in special_settings

2200

else special_settings[setting]

2201

(clientname)))

2202

for setting, value in

2203

client_config.items(clientname)))

2204

for clientname in client_config.sections())

2205

2515

2206

old_client_settings = {}

2516

clients_data = {}

2207

clients_data = []

2517

2208

2518

2209

# Get client data and settings from last running state.

2519

2210

if server_settings["restore"]:

2523

2214

(stored_state))

2524

2215

os.remove(stored_state_path)

2525

2216

except IOError as e:

2526

if e.errno == errno.ENOENT:

2527

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

2528

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

2529

else:

2530

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

2531

exc_info=e)

2217

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

2218

.format(e))

2219

if e.errno != errno.ENOENT:

2532

2220

raise

2533

except EOFError as e:

2534

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

2535

"EOFError:", exc_info=e)

2536

2221

2537

2222

with PGPEngine() as pgp:

2538

for client_name, client in clients_data.iteritems():

2223

for client in clients_data:

2224

client_name = client["name"]

2225

2539

2226

# Decide which value to use after restoring saved state.

2540

2227

# We have three different values: Old config file,

2541

2228

# new config file, and saved state.

2549

2236

if (name != "secret" and

2550

2237

value != old_client_settings[client_name]

2551

2238

[name]):

2552

client[name] = value

2239

setattr(client, name, value)

2553

2240

except KeyError:

2554

2241

pass

2555

2242

2556

2243

# Clients who has passed its expire date can still be

2557

# enabled if its last checker was successful. Clients

2558

# whose checker succeeded before we stored its state is

2559

# assumed to have successfully run all checkers during

2560

# downtime.

2561

if client["enabled"]:

2562

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

2563

if not client["last_checked_ok"]:

2564

logger.warning(

2565

"disabling client {0} - Client never "

2566

"performed a successful checker"

2567

.format(client_name))

2568

client["enabled"] = False

2569

elif client["last_checker_status"] != 0:

2570

logger.warning(

2571

"disabling client {0} - Client "

2572

"last checker failed with error code {1}"

2573

.format(client_name,

2574

client["last_checker_status"]))

2244

# enabled if its last checker was sucessful. Clients

2245

# whose checker failed before we stored its state is

2246

# assumed to have failed all checkers during downtime.

2247

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

2248

if ((datetime.datetime.utcnow()

2249

- client["last_checked_ok"])

2250

> client["interval"]):

2251

if client["last_checker_status"] != 0:

2575

2252

client["enabled"] = False

2576

2253

else:

2577

2254

client["expires"] = (datetime.datetime

2578

2255

.utcnow()

2579

2256

+ client["timeout"])

2580

logger.debug("Last checker succeeded,"

2581

" keeping {0} enabled"

2582

.format(client_name))

2257

2258

client["changedstate"] = (multiprocessing_manager

2259

.Condition

2260

(multiprocessing_manager

2261

.Lock()))

2262

if use_dbus:

2263

new_client = (ClientDBusTransitional.__new__

2264

(ClientDBusTransitional))

2265

tcp_server.clients[client_name] = new_client

2266

new_client.bus = bus

2267

for name, value in client.iteritems():

2268

setattr(new_client, name, value)

2269

client_object_name = unicode(client_name).translate(

2270

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

2271

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

2272

new_client.dbus_object_path = (dbus.ObjectPath

2273

("/clients/"

2274

+ client_object_name))

2275

DBusObjectWithProperties.__init__(new_client,

2276

new_client.bus,

2277

new_client

2278

.dbus_object_path)

2279

else:

2280

tcp_server.clients[client_name] = (Client.__new__

2281

(Client))

2282

for name, value in client.iteritems():

2283

setattr(tcp_server.clients[client_name],

2284

name, value)

2285

2583

2286

try:

2584

client["secret"] = (

2585

pgp.decrypt(client["encrypted_secret"],

2287

tcp_server.clients[client_name].secret = (

2288

pgp.decrypt(tcp_server.clients[client_name]

2289

.encrypted_secret,

2586

2290

client_settings[client_name]

2587

2291

["secret"]))

2588

2292

except PGPError:

2589

2293

# If decryption fails, we use secret from new settings

2590

2294

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

2591

2295

.format(client_name))

2592

client["secret"] = (

2296

tcp_server.clients[client_name].secret = (

2593

2297

client_settings[client_name]["secret"])

2594

2298

2595

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

2596

for client_name in (set(old_client_settings)

2597

- set(client_settings)):

2598

del clients_data[client_name]

2599

for client_name in (set(client_settings)

2600

- set(old_client_settings)):

2601

clients_data[client_name] = client_settings[client_name]

2602

2603

# Create all client objects

2604

for client_name, client in clients_data.iteritems():

2605

tcp_server.clients[client_name] = client_class(

2606

name = client_name, settings = client)

2299

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

2300

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

2301

del tcp_server.clients[clientname]

2302

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

2303

tcp_server.clients[clientname] = (client_class(name

2304

= clientname,

2305

config =

2306

client_settings

2307

[clientname]))

2607

2308

2608

2309

if not tcp_server.clients:

2609

2310

logger.warning("No clients defined")

2610

2611

if not foreground:

2612

if pidfile is not None:

2613

try:

2614

with pidfile:

2615

pid = os.getpid()

2616

pidfile.write(str(pid) + "\n".encode("utf-8"))

2617

except IOError:

2618

logger.error("Could not write to file %r with PID %d",

2619

pidfilename, pid)

2620

del pidfile

2311

2312

if not debug:

2313

try:

2314

with pidfile:

2315

pid = os.getpid()

2316

pidfile.write(str(pid) + "\n".encode("utf-8"))

2317

del pidfile

2318

except IOError:

2319

logger.error("Could not write to file %r with PID %d",

2320

pidfilename, pid)

2321

except NameError:

2322

# "pidfile" was never created

2323

pass

2621

2324

del pidfilename

2325

2326

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

2622

2327

2623

2328

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

2624

2329

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

2625

2330

2626

2331

if use_dbus:

2627

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

2628

"se.bsnet.fukt.Mandos"})

2629

class MandosDBusService(DBusObjectWithProperties):

2332

class MandosDBusService(dbus.service.Object):

2630

2333

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

2631

2334

def __init__(self):

2632

2335

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

2633

2336

_interface = "se.recompile.Mandos"

2634

2337

2635

@dbus_interface_annotations(_interface)

2636

def _foo(self):

2637

return { "org.freedesktop.DBus.Property"

2638

".EmitsChangedSignal":

2639

"false"}

2640

2641

2338

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

2642

2339

def ClientAdded(self, objpath):

2643

2340

"D-Bus signal"

2685

2382

2686

2383

del _interface

2687

2384

2688

mandos_dbus_service = MandosDBusService()

2385

class MandosDBusServiceTransitional(MandosDBusService):

2386

__metaclass__ = AlternateDBusNamesMetaclass

2387

mandos_dbus_service = MandosDBusServiceTransitional()

2689

2388

2690

2389

def cleanup():

2691

2390

"Cleanup function; run on exit"

2698

2397

# Store client before exiting. Secrets are encrypted with key

2699

2398

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

2700

2399

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

2701

clients = {}

2400

clients = []

2702

2401

with PGPEngine() as pgp:

2703

2402

for client in tcp_server.clients.itervalues():

2704

2403

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

2706

2405

key)

2707

2406

client_dict = {}

2708

2407

2709

# A list of attributes that can not be pickled

2710

# + secret.

2711

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

2712

"checker"))

2408

# A list of attributes that will not be stored when

2409

# shutting down.

2410

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

2713

2411

for name, typ in (inspect.getmembers

2714

2412

(dbus.service.Object)):

2715

2413

exclude.add(name)

2720

2418

if attr not in exclude:

2721

2419

client_dict[attr] = getattr(client, attr)

2722

2420

2723

clients[client.name] = client_dict

2421

clients.append(client_dict)

2724

2422

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

2725

2423

2726

2424

try:

2727

with (tempfile.NamedTemporaryFile

2728

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

2729

dir=os.path.dirname(stored_state_path),

2730

delete=False)) as stored_state:

2425

with os.fdopen(os.open(stored_state_path,

2426

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

2427

0600), "wb") as stored_state:

2731

2428

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

2732

tempname=stored_state.name

2733

os.rename(tempname, stored_state_path)

2734

2429

except (IOError, OSError) as e:

2735

if not debug:

2736

try:

2737

os.remove(tempname)

2738

except NameError:

2739

pass

2740

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

2741

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

2742

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

2743

else:

2744

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

2745

exc_info=e)

2746

raise e

2430

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

2431

.format(e))

2432

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

2433

raise

2747

2434

2748

2435

# Delete all clients, and settings from config

2749

2436

while tcp_server.clients:

2776

2463

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

2777

2464

if use_ipv6:

2778

2465

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

2779

" flowinfo %d, scope_id %d",

2780

*tcp_server.socket.getsockname())

2466

" flowinfo %d, scope_id %d"

2467

% tcp_server.socket.getsockname())

2781

2468

else: # IPv4

2782

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

2783

*tcp_server.socket.getsockname())

2469

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

2470

% tcp_server.socket.getsockname())

2784

2471

2785

2472

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

2786

2473

2789

2476

try:

2790

2477

service.activate()

2791

2478

except dbus.exceptions.DBusException as error:

2792

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

2479

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

2793

2480

cleanup()

2794

2481

sys.exit(1)

2795

2482

# End of Avahi example code

2802

2489

logger.debug("Starting main loop")

2803

2490

main_loop.run()

2804

2491

except AvahiError as error:

2805

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

2492

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

2806

2493

cleanup()

2807

2494

sys.exit(1)

2808

2495

except KeyboardInterrupt:

2813

2500

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

2814

2501

cleanup()

2815

2502

2503

2816

2504

if __name__ == '__main__':

2817

2505

main()