/mandos/release : revision 237.7.159

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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 = "1.4.1"

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version = "1.6.0"

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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(level=logging.WARNING):

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

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(asctime)s %(name)s'

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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if debug:

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(asctime)s %(name)s'

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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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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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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def __exit__ (self, exc_type, exc_value, traceback):

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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) as devnull:

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with open(os.devnull, "w") as devnull:

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try:

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proc = self.gnupg.run(['--symmetric'],

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create_fhs=['stdin', 'stdout'],

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def decrypt(self, data, password):

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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with open(os.devnull, "w") as devnull:

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try:

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proc = self.gnupg.run(['--decrypt'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin'] ) as f:

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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("DBusException: %s", error)

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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

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.format(error))

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def cleanup(self):

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

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if self.group is not None:

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

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

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% self.name))

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

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

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.format(self.name)))

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return ret

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def _timedelta_to_milliseconds(td):

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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return ((td.days * 24 * 60 * 60 * 1000)

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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"""A representation of a client host served by this server.

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Attributes:

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_approved: bool(); 'None' if not yet approved/disapproved

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approved: bool(); 'None' if not yet approved/disapproved

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approval_delay: datetime.timedelta(); Time to wait for approval

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approval_duration: datetime.timedelta(); Duration of one approval

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checker: subprocess.Popen(); a running checker process used

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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, or None.

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checker, -2 means no checker completed yet.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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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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"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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return _timedelta_to_milliseconds(self.timeout)

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return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.extended_timeout)

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return timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.interval)

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return timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return _timedelta_to_milliseconds(self.approval_delay)

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

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"""Note: the 'checker' key in 'config' sets the

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'checker_command' attribute and *not* the 'checker'

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attribute."""

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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NOTE: Must be a pure function. Must return the same result

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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client["host"] = section["host"]

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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client["enabled"] = config.getboolean(client_name,

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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client["secret"] = section["secret"].decode("base64")

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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client["secret"] = secfile.read()

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else:

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raise TypeError("No secret or secfile for section {0}"

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.format(section))

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client["timeout"] = string_to_delta(section["timeout"])

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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client["interval"] = string_to_delta(section["interval"])

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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client["checker_command"] = section["checker"]

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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self.name = name

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if config is None:

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config = {}

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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

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.replace(" ", ""))

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

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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.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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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.approved = None

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self.approvals_pending = 0

503

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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579

return

532

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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582

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

542

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if not quiet:

543

self.send_changedstate()

544

if not quiet:

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

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

592

if getattr(self, "disable_initiator_tag", None) 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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self.expires = None

550

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

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

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597

gobject.source_remove(self.checker_initiator_tag)

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598

self.checker_initiator_tag = None

553

599

self.stop_checker()

554

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self.enabled = False

601

if not quiet:

602

self.send_changedstate()

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603

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

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604

return False

557

605

561

609

def init_checker(self):

562

610

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

563

611

# and every interval from then on.

612

if self.checker_initiator_tag is not None:

613

gobject.source_remove(self.checker_initiator_tag)

564

614

self.checker_initiator_tag = (gobject.timeout_add

565

615

(self.interval_milliseconds(),

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self.start_checker))

567

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

618

if self.disable_initiator_tag is not None:

619

gobject.source_remove(self.disable_initiator_tag)

568

620

self.disable_initiator_tag = (gobject.timeout_add

569

621

(self.timeout_milliseconds(),

570

622

self.disable))

576

628

self.checker_callback_tag = None

577

629

self.checker = None

578

630

if os.WIFEXITED(condition):

579

self.last_checker_status = os.WEXITSTATUS(condition)

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self.last_checker_status = os.WEXITSTATUS(condition)

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632

if self.last_checker_status == 0:

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633

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

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634

vars(self))

589

641

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

590

642

vars(self))

591

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def checked_ok(self, timeout=None):

593

"""Bump up the timeout for this client.

594

595

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

596

alive and well.

597

"""

644

def checked_ok(self):

645

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

646

self.last_checked_ok = datetime.datetime.utcnow()

647

self.last_checker_status = 0

648

self.bump_timeout()

649

650

def bump_timeout(self, timeout=None):

651

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

598

652

if timeout is None:

599

653

timeout = self.timeout

600

self.last_checked_ok = datetime.datetime.utcnow()

601

654

if self.disable_initiator_tag is not None:

602

655

gobject.source_remove(self.disable_initiator_tag)

656

self.disable_initiator_tag = None

603

657

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

604

658

self.disable_initiator_tag = (gobject.timeout_add

605

(_timedelta_to_milliseconds

659

(timedelta_to_milliseconds

606

660

(timeout), self.disable))

607

661

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

608

662

615

669

If a checker already exists, leave it running and do

616

670

nothing."""

617

671

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

618

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

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

620

# client would inevitably timeout, since no checker would get

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

672

# 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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# 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

640

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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)

641

700

try:

642

# In case checker_command has exactly one % operator

643

command = self.checker_command % self.host

644

except TypeError:

645

# Escape attributes for the shell

646

escaped_attrs = dict(

647

(attr,

648

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

649

errors=

650

'replace')))

651

for attr in

652

self.runtime_expansions)

653

654

try:

655

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

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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706

self.current_checker_command = command

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707

try:

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708

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

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714

self.checker = subprocess.Popen(command,

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715

close_fds=True,

670

716

shell=True, cwd="/")

671

self.checker_callback_tag = (gobject.child_watch_add

672

(self.checker.pid,

673

self.checker_callback,

674

data=command))

675

# The checker may have completed before the gobject

676

# watch was added. Check for this.

717

except OSError as error:

718

logger.error("Failed to start subprocess",

719

exc_info=error)

720

return True

721

self.checker_callback_tag = (gobject.child_watch_add

722

(self.checker.pid,

723

self.checker_callback,

724

data=command))

725

# The checker may have completed before the gobject

726

# watch was added. Check for this.

727

try:

677

728

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)

681

729

except OSError as error:

682

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

683

error)

730

if error.errno == errno.ECHILD:

731

# This should never happen

732

logger.error("Child process vanished",

733

exc_info=error)

734

return True

735

raise

736

if pid:

737

gobject.source_remove(self.checker_callback_tag)

738

self.checker_callback(pid, status, command)

684

739

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

685

740

return True

686

741

693

748

return

694

749

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

695

750

try:

696

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

751

self.checker.terminate()

697

752

#time.sleep(0.5)

698

753

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

699

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

754

# self.checker.kill()

700

755

except OSError as error:

701

756

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

702

757

raise

719

774

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

720

775

if byte_arrays and signature != "ay":

721

776

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

722

" signature %r" % signature)

777

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

723

778

def decorator(func):

724

779

func._dbus_is_property = True

725

780

func._dbus_interface = dbus_interface

733

788

return decorator

734

789

735

790

791

def dbus_interface_annotations(dbus_interface):

792

"""Decorator for marking functions returning interface annotations

793

794

Usage:

795

796

@dbus_interface_annotations("org.example.Interface")

797

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

798

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

799

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

800

"false"}

801

"""

802

def decorator(func):

803

func._dbus_is_interface = True

804

func._dbus_interface = dbus_interface

805

func._dbus_name = dbus_interface

806

return func

807

return decorator

808

809

810

def dbus_annotations(annotations):

811

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

812

Usage:

813

814

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

815

access="r")

816

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

817

"org.freedesktop.DBus.Property."

818

"EmitsChangedSignal": "false"})

819

def Property_dbus_property(self):

820

return dbus.Boolean(False)

821

"""

822

def decorator(func):

823

func._dbus_annotations = annotations

824

return func

825

return decorator

826

827

736

828

class DBusPropertyException(dbus.exceptions.DBusException):

737

829

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

738

830

"""

761

853

"""

762

854

763

855

@staticmethod

764

def _is_dbus_property(obj):

765

return getattr(obj, "_dbus_is_property", False)

856

def _is_dbus_thing(thing):

857

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

858

859

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

860

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

861

"""

862

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

863

False)

766

864

767

def _get_all_dbus_properties(self):

865

def _get_all_dbus_things(self, thing):

768

866

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

769

867

"""

770

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

868

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

869

name),

870

athing.__get__(self))

771

871

for cls in self.__class__.__mro__

772

for name, prop in

773

inspect.getmembers(cls, self._is_dbus_property))

872

for name, athing in

873

inspect.getmembers(cls,

874

self._is_dbus_thing(thing)))

774

875

775

876

def _get_dbus_property(self, interface_name, property_name):

776

877

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

778

879

"""

779

880

for cls in self.__class__.__mro__:

780

881

for name, value in (inspect.getmembers

781

(cls, self._is_dbus_property)):

882

(cls,

883

self._is_dbus_thing("property"))):

782

884

if (value._dbus_name == property_name

783

885

and value._dbus_interface == interface_name):

784

886

return value.__get__(self)

813

915

# signatures other than "ay".

814

916

if prop._dbus_signature != "ay":

815

917

raise ValueError

816

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

817

for byte in value))

918

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

919

for byte in value))

818

920

prop(value)

819

921

820

922

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

826

928

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

827

929

"""

828

930

properties = {}

829

for name, prop in self._get_all_dbus_properties():

931

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

830

932

if (interface_name

831

933

and interface_name != prop._dbus_interface):

832

934

# Interface non-empty but did not match

847

949

path_keyword='object_path',

848

950

connection_keyword='connection')

849

951

def Introspect(self, object_path, connection):

850

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

952

"""Overloading of standard D-Bus method.

953

954

Inserts property tags and interface annotation tags.

851

955

"""

852

956

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

853

957

connection)

860

964

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

861

965

return e

862

966

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

967

# Add property tags

863

968

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

864

969

for name, prop

865

in self._get_all_dbus_properties()

970

in self._get_all_dbus_things("property")

866

971

if prop._dbus_interface

867

972

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

868

973

if_tag.appendChild(tag)

974

# Add annotation tags

975

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

976

for tag in if_tag.getElementsByTagName(typ):

977

annots = dict()

978

for name, prop in (self.

979

_get_all_dbus_things(typ)):

980

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

981

and prop._dbus_interface

982

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

983

annots.update(getattr

984

(prop,

985

"_dbus_annotations",

986

{}))

987

for name, value in annots.iteritems():

988

ann_tag = document.createElement(

989

"annotation")

990

ann_tag.setAttribute("name", name)

991

ann_tag.setAttribute("value", value)

992

tag.appendChild(ann_tag)

993

# Add interface annotation tags

994

for annotation, value in dict(

995

itertools.chain.from_iterable(

996

annotations().iteritems()

997

for name, annotations in

998

self._get_all_dbus_things("interface")

999

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

1000

)).iteritems():

1001

ann_tag = document.createElement("annotation")

1002

ann_tag.setAttribute("name", annotation)

1003

ann_tag.setAttribute("value", value)

1004

if_tag.appendChild(ann_tag)

869

1005

# Add the names to the return values for the

870

1006

# "org.freedesktop.DBus.Properties" methods

871

1007

if (if_tag.getAttribute("name")

886

1022

except (AttributeError, xml.dom.DOMException,

887

1023

xml.parsers.expat.ExpatError) as error:

888

1024

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

889

error)

1025

exc_info=error)

890

1026

return xmlstring

891

1027

892

1028

893

def datetime_to_dbus (dt, variant_level=0):

1029

def datetime_to_dbus(dt, variant_level=0):

894

1030

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

895

1031

if dt is None:

896

1032

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

898

1034

variant_level=variant_level)

899

1035

900

1036

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.

1037

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1038

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

1039

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

1040

interface names according to the "alt_interface_names" mapping.

1041

Usage:

1042

1043

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

1044

"net.example.AlternateInterface"})

1045

class SampleDBusObject(dbus.service.Object):

1046

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

1047

def SampleDBusMethod():

1048

pass

1049

1050

The above "SampleDBusMethod" on "SampleDBusObject" will be

1051

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

1052

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

1053

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

1054

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

1055

1056

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

1057

(from DBusObjectWithProperties) and interfaces (from the

1058

dbus_interface_annotations decorator).

905

1059

"""

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):

1060

def wrapper(cls):

1061

for orig_interface_name, alt_interface_name in (

1062

alt_interface_names.iteritems()):

1063

attr = {}

1064

interface_names = set()

1065

# Go though all attributes of the class

1066

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

913

1067

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

914

1068

# with the wrong interface name

915

1069

if (not hasattr(attribute, "_dbus_interface")

916

1070

or not attribute._dbus_interface

917

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

1071

.startswith(orig_interface_name)):

918

1072

continue

919

1073

# Create an alternate D-Bus interface name based on

920

1074

# the current name

921

1075

alt_interface = (attribute._dbus_interface

922

.replace("se.recompile.Mandos",

923

"se.bsnet.fukt.Mandos"))

1076

.replace(orig_interface_name,

1077

alt_interface_name))

1078

interface_names.add(alt_interface)

924

1079

# Is this a D-Bus signal?

925

1080

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

926

1081

# Extract the original non-method function by

941

1096

nonmethod_func.func_name,

942

1097

nonmethod_func.func_defaults,

943

1098

nonmethod_func.func_closure)))

1099

# Copy annotations, if any

1100

try:

1101

new_function._dbus_annotations = (

1102

dict(attribute._dbus_annotations))

1103

except AttributeError:

1104

pass

944

1105

# Define a creator of a function to call both the

945

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

946

# signals gets sent when the function is called

1106

# original and alternate functions, so both the

1107

# original and alternate signals gets sent when

1108

# the function is called

947

1109

def fixscope(func1, func2):

948

1110

"""This function is a scope container to pass

949

1111

func1 and func2 to the "call_both" function

956

1118

return call_both

957

1119

# Create the "call_both" function and add it to

958

1120

# the class

959

attr[attrname] = fixscope(attribute,

960

new_function)

1121

attr[attrname] = fixscope(attribute, new_function)

961

1122

# Is this a D-Bus method?

962

1123

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

963

1124

# Create a new, but exactly alike, function

974

1135

attribute.func_name,

975

1136

attribute.func_defaults,

976

1137

attribute.func_closure)))

1138

# Copy annotations, if any

1139

try:

1140

attr[attrname]._dbus_annotations = (

1141

dict(attribute._dbus_annotations))

1142

except AttributeError:

1143

pass

977

1144

# Is this a D-Bus property?

978

1145

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

979

1146

# Create a new, but exactly alike, function

993

1160

attribute.func_name,

994

1161

attribute.func_defaults,

995

1162

attribute.func_closure)))

996

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

997

998

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1169

# Is this a D-Bus interface?

1170

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

1171

# Create a new, but exactly alike, function

1172

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

1173

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

1174

# to the class.

1175

attr[attrname] = (dbus_interface_annotations

1176

(alt_interface)

1177

(types.FunctionType

1178

(attribute.func_code,

1179

attribute.func_globals,

1180

attribute.func_name,

1181

attribute.func_defaults,

1182

attribute.func_closure)))

1183

if deprecate:

1184

# Deprecate all alternate interfaces

1185

iname="_AlternateDBusNames_interface_annotation{0}"

1186

for interface_name in interface_names:

1187

@dbus_interface_annotations(interface_name)

1188

def func(self):

1189

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

1190

"true" }

1191

# Find an unused name

1192

for aname in (iname.format(i)

1193

for i in itertools.count()):

1194

if aname not in attr:

1195

attr[aname] = func

1196

break

1197

if interface_names:

1198

# Replace the class with a new subclass of it with

1199

# methods, signals, etc. as created above.

1200

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

1201

(cls,), attr)

1202

return cls

1203

return wrapper

1204

1205

1206

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

1207

"se.bsnet.fukt.Mandos"})

999

1208

class ClientDBus(Client, DBusObjectWithProperties):

1000

1209

"""A Client class using D-Bus

1001

1210

1012

1221

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

1013

1222

self.bus = bus

1014

1223

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

1015

1016

self._approvals_pending = 0

1017

1224

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

1018

1225

# the D-Bus

1019

1226

client_object_name = unicode(self.name).translate(

1023

1230

("/clients/" + client_object_name))

1024

1231

DBusObjectWithProperties.__init__(self, self.bus,

1025

1232

self.dbus_object_path)

1026

1233

1027

1234

def notifychangeproperty(transform_func,

1028

1235

dbus_name, type_func=lambda x: x,

1029

1236

variant_level=1):

1052

1259

1053

1260

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

1054

1261

1055

1056

1262

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1057

1263

approvals_pending = notifychangeproperty(dbus.Boolean,

1058

1264

"ApprovalPending",

1065

1271

checker is not None)

1066

1272

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1067

1273

"LastCheckedOK")

1274

last_checker_status = notifychangeproperty(dbus.Int16,

1275

"LastCheckerStatus")

1068

1276

last_approval_request = notifychangeproperty(

1069

1277

datetime_to_dbus, "LastApprovalRequest")

1070

1278

approved_by_default = notifychangeproperty(dbus.Boolean,

1071

1279

"ApprovedByDefault")

1072

approval_delay = notifychangeproperty(dbus.UInt16,

1280

approval_delay = notifychangeproperty(dbus.UInt64,

1073

1281

"ApprovalDelay",

1074

1282

type_func =

1075

_timedelta_to_milliseconds)

1283

timedelta_to_milliseconds)

1076

1284

approval_duration = notifychangeproperty(

1077

dbus.UInt16, "ApprovalDuration",

1078

type_func = _timedelta_to_milliseconds)

1285

dbus.UInt64, "ApprovalDuration",

1286

type_func = timedelta_to_milliseconds)

1079

1287

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

1080

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

1288

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

1081

1289

type_func =

1082

_timedelta_to_milliseconds)

1290

timedelta_to_milliseconds)

1083

1291

extended_timeout = notifychangeproperty(

1084

dbus.UInt16, "ExtendedTimeout",

1085

type_func = _timedelta_to_milliseconds)

1086

interval = notifychangeproperty(dbus.UInt16,

1292

dbus.UInt64, "ExtendedTimeout",

1293

type_func = timedelta_to_milliseconds)

1294

interval = notifychangeproperty(dbus.UInt64,

1087

1295

"Interval",

1088

1296

type_func =

1089

_timedelta_to_milliseconds)

1297

timedelta_to_milliseconds)

1090

1298

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

1091

1299

1092

1300

del notifychangeproperty

1134

1342

return r

1135

1343

1136

1344

def _reset_approved(self):

1137

self._approved = None

1345

self.approved = None

1138

1346

return False

1139

1347

1140

1348

def approve(self, value=True):

1141

self.send_changedstate()

1142

self._approved = value

1143

gobject.timeout_add(_timedelta_to_milliseconds

1349

self.approved = value

1350

gobject.timeout_add(timedelta_to_milliseconds

1144

1351

(self.approval_duration),

1145

1352

self._reset_approved)

1146

1353

self.send_changedstate()

1147

1354

1148

1355

## D-Bus methods, signals & properties

1149

1356

_interface = "se.recompile.Mandos.Client"

1150

1357

1358

## Interfaces

1359

1360

@dbus_interface_annotations(_interface)

1361

def _foo(self):

1362

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

1363

"false"}

1364

1151

1365

## Signals

1152

1366

1153

1367

# CheckerCompleted - signal

1189

1403

"D-Bus signal"

1190

1404

return self.need_approval()

1191

1405

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

1200

1406

## Methods

1201

1407

1202

1408

# Approve - method

1260

1466

access="readwrite")

1261

1467

def ApprovalDuration_dbus_property(self, value=None):

1262

1468

if value is None: # get

1263

return dbus.UInt64(_timedelta_to_milliseconds(

1469

return dbus.UInt64(timedelta_to_milliseconds(

1264

1470

self.approval_duration))

1265

1471

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

1266

1472

1280

1486

def Host_dbus_property(self, value=None):

1281

1487

if value is None: # get

1282

1488

return dbus.String(self.host)

1283

self.host = value

1489

self.host = unicode(value)

1284

1490

1285

1491

# Created - property

1286

1492

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

1312

1518

return

1313

1519

return datetime_to_dbus(self.last_checked_ok)

1314

1520

1521

# LastCheckerStatus - property

1522

@dbus_service_property(_interface, signature="n",

1523

access="read")

1524

def LastCheckerStatus_dbus_property(self):

1525

return dbus.Int16(self.last_checker_status)

1526

1315

1527

# Expires - property

1316

1528

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

1317

1529

def Expires_dbus_property(self):

1328

1540

def Timeout_dbus_property(self, value=None):

1329

1541

if value is None: # get

1330

1542

return dbus.UInt64(self.timeout_milliseconds())

1543

old_timeout = self.timeout

1331

1544

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

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))

1545

# Reschedule disabling

1546

if self.enabled:

1547

now = datetime.datetime.utcnow()

1548

self.expires += self.timeout - old_timeout

1549

if self.expires <= now:

1550

# The timeout has passed

1551

self.disable()

1552

else:

1553

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

1554

is None):

1555

return

1556

gobject.source_remove(self.disable_initiator_tag)

1557

self.disable_initiator_tag = (

1558

gobject.timeout_add(

1559

timedelta_to_milliseconds(self.expires - now),

1560

self.disable))

1352

1561

1353

1562

# ExtendedTimeout - property

1354

1563

@dbus_service_property(_interface, signature="t",

1380

1589

def Checker_dbus_property(self, value=None):

1381

1590

if value is None: # get

1382

1591

return dbus.String(self.checker_command)

1383

self.checker_command = value

1592

self.checker_command = unicode(value)

1384

1593

1385

1594

# CheckerRunning - property

1386

1595

@dbus_service_property(_interface, signature="b",

1415

1624

raise KeyError()

1416

1625

1417

1626

def __getattribute__(self, name):

1418

if(name == '_pipe'):

1627

if name == '_pipe':

1419

1628

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

1420

1629

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

1421

1630

data = self._pipe.recv()

1428

1637

return func

1429

1638

1430

1639

def __setattr__(self, name, value):

1431

if(name == '_pipe'):

1640

if name == '_pipe':

1432

1641

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

1433

1642

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

1434

1643

1435

1644

1436

class ClientDBusTransitional(ClientDBus):

1437

__metaclass__ = AlternateDBusNamesMetaclass

1438

1439

1440

1645

class ClientHandler(socketserver.BaseRequestHandler, object):

1441

1646

"""A class to handle client connections.

1442

1647

1503

1708

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

1504

1709

return

1505

1710

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

1506

if self.server.use_dbus:

1507

# Emit D-Bus signal

1508

client.NewRequest(str(self.client_address))

1509

1711

1510

1712

try:

1511

1713

client = ProxyClient(child_pipe, fpr,

1527

1729

client.Rejected("Disabled")

1528

1730

return

1529

1731

1530

if client._approved or not client.approval_delay:

1732

if client.approved or not client.approval_delay:

1531

1733

#We are approved or approval is disabled

1532

1734

break

1533

elif client._approved is None:

1735

elif client.approved is None:

1534

1736

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

1535

1737

client.name)

1536

1738

if self.server.use_dbus:

1549

1751

#wait until timeout or approved

1550

1752

time = datetime.datetime.now()

1551

1753

client.changedstate.acquire()

1552

(client.changedstate.wait

1553

(float(client._timedelta_to_milliseconds(delay)

1554

/ 1000)))

1754

client.changedstate.wait(

1755

float(timedelta_to_milliseconds(delay)

1756

/ 1000))

1555

1757

client.changedstate.release()

1556

1758

time2 = datetime.datetime.now()

1557

1759

if (time2 - time) >= delay:

1573

1775

try:

1574

1776

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

1575

1777

except gnutls.errors.GNUTLSError as error:

1576

logger.warning("gnutls send failed")

1778

logger.warning("gnutls send failed",

1779

exc_info=error)

1577

1780

return

1578

1781

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

1579

1782

sent, len(client.secret)

1582

1785

1583

1786

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

1584

1787

# bump the timeout using extended_timeout

1585

client.checked_ok(client.extended_timeout)

1788

client.bump_timeout(client.extended_timeout)

1586

1789

if self.server.use_dbus:

1587

1790

# Emit D-Bus signal

1588

1791

client.GotSecret()

1593

1796

try:

1594

1797

session.bye()

1595

1798

except gnutls.errors.GNUTLSError as error:

1596

logger.warning("GnuTLS bye failed")

1799

logger.warning("GnuTLS bye failed",

1800

exc_info=error)

1597

1801

1598

1802

@staticmethod

1599

1803

def peer_certificate(session):

1664

1868

def sub_process_main(self, request, address):

1665

1869

try:

1666

1870

self.finish_request(request, address)

1667

except:

1871

except Exception:

1668

1872

self.handle_error(request, address)

1669

1873

self.close_request(request)

1670

1874

1671

1875

def process_request(self, request, address):

1672

1876

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

1673

1877

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

1674

args = (request,

1675

address))

1878

args = (request, address))

1676

1879

proc.start()

1677

1880

return proc

1678

1881

1706

1909

use_ipv6: Boolean; to use IPv6 or not

1707

1910

"""

1708

1911

def __init__(self, server_address, RequestHandlerClass,

1709

interface=None, use_ipv6=True):

1912

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

1913

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

1914

creating a new one with socket.socket().

1915

"""

1710

1916

self.interface = interface

1711

1917

if use_ipv6:

1712

1918

self.address_family = socket.AF_INET6

1919

if socketfd is not None:

1920

# Save the file descriptor

1921

self.socketfd = socketfd

1922

# Save the original socket.socket() function

1923

self.socket_socket = socket.socket

1924

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

1925

#

1926

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

1927

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

1928

# patching socket.socket.)

1929

#

1930

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

1931

@functools.wraps(socket.socket)

1932

def socket_wrapper(*args, **kwargs):

1933

# Restore original function so subsequent calls are

1934

# not affected.

1935

socket.socket = self.socket_socket

1936

del self.socket_socket

1937

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

1938

# saved file descriptor.

1939

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

1940

# Replace socket.socket() function with wrapper

1941

socket.socket = socket_wrapper

1942

# The socketserver.TCPServer.__init__ will call

1943

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

1944

# socket_wrapper(), if socketfd was set.

1713

1945

socketserver.TCPServer.__init__(self, server_address,

1714

1946

RequestHandlerClass)

1947

1715

1948

def server_bind(self):

1716

1949

"""This overrides the normal server_bind() function

1717

1950

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

1725

1958

try:

1726

1959

self.socket.setsockopt(socket.SOL_SOCKET,

1727

1960

SO_BINDTODEVICE,

1728

str(self.interface

1729

+ '\0'))

1961

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

1730

1962

except socket.error as error:

1731

if error[0] == errno.EPERM:

1732

logger.error("No permission to"

1733

" bind to interface %s",

1734

self.interface)

1735

elif error[0] == errno.ENOPROTOOPT:

1963

if error.errno == errno.EPERM:

1964

logger.error("No permission to bind to"

1965

" interface %s", self.interface)

1966

elif error.errno == errno.ENOPROTOOPT:

1736

1967

logger.error("SO_BINDTODEVICE not available;"

1737

1968

" cannot bind to interface %s",

1738

1969

self.interface)

1970

elif error.errno == errno.ENODEV:

1971

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

1972

" cannot bind", self.interface)

1739

1973

else:

1740

1974

raise

1741

1975

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

1771

2005

"""

1772

2006

def __init__(self, server_address, RequestHandlerClass,

1773

2007

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

1774

gnutls_priority=None, use_dbus=True):

2008

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

1775

2009

self.enabled = False

1776

2010

self.clients = clients

1777

2011

if self.clients is None:

1781

2015

IPv6_TCPServer.__init__(self, server_address,

1782

2016

RequestHandlerClass,

1783

2017

interface = interface,

1784

use_ipv6 = use_ipv6)

2018

use_ipv6 = use_ipv6,

2019

socketfd = socketfd)

1785

2020

def server_activate(self):

1786

2021

if self.enabled:

1787

2022

return socketserver.TCPServer.server_activate(self)

1800

2035

1801

2036

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

1802

2037

proc = None, client_object=None):

1803

condition_names = {

1804

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

1805

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

1806

# blocking).

1807

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

1808

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

1809

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

1810

# broken, usually for pipes and

1811

# sockets).

1812

}

1813

conditions_string = ' | '.join(name

1814

for cond, name in

1815

condition_names.iteritems()

1816

if cond & condition)

1817

2038

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

1818

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

2039

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

1819

2040

# Wait for other process to exit

1820

2041

proc.join()

1821

2042

return False

1879

2100

return True

1880

2101

1881

2102

2103

def rfc3339_duration_to_delta(duration):

2104

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

2105

2106

>>> rfc3339_duration_to_delta("P7D")

2107

datetime.timedelta(7)

2108

>>> rfc3339_duration_to_delta("PT60S")

2109

datetime.timedelta(0, 60)

2110

>>> rfc3339_duration_to_delta("PT60M")

2111

datetime.timedelta(0, 3600)

2112

>>> rfc3339_duration_to_delta("PT24H")

2113

datetime.timedelta(1)

2114

>>> rfc3339_duration_to_delta("P1W")

2115

datetime.timedelta(7)

2116

>>> rfc3339_duration_to_delta("PT5M30S")

2117

datetime.timedelta(0, 330)

2118

>>> rfc3339_duration_to_delta("P1DT3M20S")

2119

datetime.timedelta(1, 200)

2120

"""

2121

2122

# Parsing an RFC 3339 duration with regular expressions is not

2123

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

2124

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

2125

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

2126

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

2127

# avoid excessive use of external libraries.

2128

2129

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

2130

Token = collections.namedtuple("Token",

2131

("regexp", # To match token; if

2132

# "value" is not None,

2133

# must have a "group"

2134

# containing digits

2135

"value", # datetime.timedelta or

2136

# None

2137

"followers")) # Tokens valid after

2138

# this token

2139

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

2140

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

2141

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

2142

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

2143

datetime.timedelta(seconds=1),

2144

frozenset((token_end,)))

2145

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

2146

datetime.timedelta(minutes=1),

2147

frozenset((token_second, token_end)))

2148

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

2149

datetime.timedelta(hours=1),

2150

frozenset((token_minute, token_end)))

2151

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

2152

None,

2153

frozenset((token_hour, token_minute,

2154

token_second)))

2155

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

2156

datetime.timedelta(days=1),

2157

frozenset((token_time, token_end)))

2158

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

2159

datetime.timedelta(weeks=4),

2160

frozenset((token_day, token_end)))

2161

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

2162

datetime.timedelta(weeks=52),

2163

frozenset((token_month, token_end)))

2164

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

2165

datetime.timedelta(weeks=1),

2166

frozenset((token_end,)))

2167

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

2168

frozenset((token_year, token_month,

2169

token_day, token_time,

2170

token_week))),

2171

# Define starting values

2172

value = datetime.timedelta() # Value so far

2173

found_token = None

2174

followers = frozenset(token_duration,) # Following valid tokens

2175

s = duration # String left to parse

2176

# Loop until end token is found

2177

while found_token is not token_end:

2178

# Search for any currently valid tokens

2179

for token in followers:

2180

match = token.regexp.match(s)

2181

if match is not None:

2182

# Token found

2183

if token.value is not None:

2184

# Value found, parse digits

2185

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

2186

# Add to value so far

2187

value += factor * token.value

2188

# Strip token from string

2189

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

2190

# Go to found token

2191

found_token = token

2192

# Set valid next tokens

2193

followers = found_token.followers

2194

break

2195

else:

2196

# No currently valid tokens were found

2197

raise ValueError("Invalid RFC 3339 duration")

2198

# End token found

2199

return value

2200

2201

1882

2202

def string_to_delta(interval):

1883

2203

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

1884

2204

1895

2215

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

1896

2216

datetime.timedelta(0, 330)

1897

2217

"""

2218

2219

try:

2220

return rfc3339_duration_to_delta(interval)

2221

except ValueError:

2222

pass

2223

1898

2224

timevalue = datetime.timedelta(0)

1899

2225

for s in interval.split():

1900

2226

try:

1911

2237

elif suffix == "w":

1912

2238

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

1913

2239

else:

1914

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

2240

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

2241

.format(suffix))

1915

2242

except (ValueError, IndexError) as e:

1916

2243

raise ValueError(*(e.args))

1917

2244

timevalue += delta

1931

2258

sys.exit()

1932

2259

if not noclose:

1933

2260

# Close all standard open file descriptors

1934

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

2261

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

1935

2262

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

1936

2263

raise OSError(errno.ENODEV,

1937

"%s not a character device"

1938

% os.path.devnull)

2264

"{0} not a character device"

2265

.format(os.devnull))

1939

2266

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

1940

2267

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

1941

2268

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

1950

2277

1951

2278

parser = argparse.ArgumentParser()

1952

2279

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

1953

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

2280

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

1954

2281

help="show version number and exit")

1955

2282

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

1956

2283

help="Bind to interface IF")

1981

2308

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

1982

2309

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

1983

2310

" state")

2311

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

2312

help="Specify a file descriptor to a network"

2313

" socket to use instead of creating one")

1984

2314

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

1985

2315

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

2316

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

2317

help="Run in foreground")

1986

2318

1987

2319

options = parser.parse_args()

1988

2320

2003

2335

"use_ipv6": "True",

2004

2336

"debuglevel": "",

2005

2337

"restore": "True",

2006

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

2338

"socket": "",

2339

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

2340

"foreground": "False",

2007

2341

}

2008

2342

2009

2343

# Parse config file for server-global settings

2014

2348

# Convert the SafeConfigParser object to a dict

2015

2349

server_settings = server_config.defaults()

2016

2350

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

2017

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

2351

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

2018

2352

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

2019

2353

option)

2020

2354

if server_settings["port"]:

2021

2355

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

2022

2356

"port")

2357

if server_settings["socket"]:

2358

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

2359

"socket")

2360

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

2361

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

2362

# happen with a supplied network socket.

2363

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

2364

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

2365

["socket"])

2023

2366

del server_config

2024

2367

2025

2368

# Override the settings from the config file with command line

2027

2370

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

2028

2371

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

2029

2372

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

2030

"statedir"):

2373

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

2031

2374

value = getattr(options, option)

2032

2375

if value is not None:

2033

2376

server_settings[option] = value

2036

2379

for option in server_settings.keys():

2037

2380

if type(server_settings[option]) is str:

2038

2381

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

2382

# Debug implies foreground

2383

if server_settings["debug"]:

2384

server_settings["foreground"] = True

2039

2385

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

2040

2386

2041

2387

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

2047

2393

use_ipv6 = server_settings["use_ipv6"]

2048

2394

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

2049

2395

stored_state_file)

2396

foreground = server_settings["foreground"]

2050

2397

2051

2398

if debug:

2052

initlogger(logging.DEBUG)

2399

initlogger(debug, logging.DEBUG)

2053

2400

else:

2054

2401

if not debuglevel:

2055

initlogger()

2402

initlogger(debug)

2056

2403

else:

2057

2404

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

2058

initlogger(level)

2405

initlogger(debug, level)

2059

2406

2060

2407

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

2061

2408

syslogger.setFormatter(logging.Formatter

2062

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

2063

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

2064

% server_settings["servicename"]))

2409

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

2410

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

2411

.format(server_settings

2412

["servicename"])))

2065

2413

2066

2414

# Parse config file with clients

2067

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

2068

"extended_timeout": "15m",

2069

"interval": "2m",

2070

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

2071

"host": "",

2072

"approval_delay": "0s",

2073

"approval_duration": "1s",

2074

}

2075

client_config = configparser.SafeConfigParser(client_defaults)

2415

client_config = configparser.SafeConfigParser(Client

2416

.client_defaults)

2076

2417

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

2077

2418

"clients.conf"))

2078

2419

2087

2428

use_ipv6=use_ipv6,

2088

2429

gnutls_priority=

2089

2430

server_settings["priority"],

2090

use_dbus=use_dbus)

2091

if not debug:

2431

use_dbus=use_dbus,

2432

socketfd=(server_settings["socket"]

2433

or None))

2434

if not foreground:

2092

2435

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

2436

pidfile = None

2093

2437

try:

2094

2438

pidfile = open(pidfilename, "w")

2095

except IOError:

2096

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

2439

except IOError as e:

2440

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

2441

exc_info=e)

2097

2442

2098

try:

2099

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

2100

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

2101

except KeyError:

2443

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

2102

2444

try:

2103

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

2104

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

2445

uid = pwd.getpwnam(name).pw_uid

2446

gid = pwd.getpwnam(name).pw_gid

2447

break

2105

2448

except KeyError:

2106

try:

2107

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

2108

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

2109

except KeyError:

2110

uid = 65534

2111

gid = 65534

2449

continue

2450

else:

2451

uid = 65534

2452

gid = 65534

2112

2453

try:

2113

2454

os.setgid(gid)

2114

2455

os.setuid(uid)

2115

2456

except OSError as error:

2116

if error[0] != errno.EPERM:

2457

if error.errno != errno.EPERM:

2117

2458

raise error

2118

2459

2119

2460

if debug:

2131

2472

.gnutls_global_set_log_function(debug_gnutls))

2132

2473

2133

2474

# Redirect stdin so all checkers get /dev/null

2134

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

2475

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

2135

2476

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

2136

2477

if null > 2:

2137

2478

os.close(null)

2138

else:

2139

# No console logging

2140

logger.removeHandler(console)

2141

2479

2142

2480

# Need to fork before connecting to D-Bus

2143

if not debug:

2481

if not foreground:

2144

2482

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

2145

2483

daemon()

2146

2484

2485

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

2486

# need to inform gobject that threads will be used.

2487

gobject.threads_init()

2488

2147

2489

global main_loop

2148

2490

# From the Avahi example code

2149

DBusGMainLoop(set_as_default=True )

2491

DBusGMainLoop(set_as_default=True)

2150

2492

main_loop = gobject.MainLoop()

2151

2493

bus = dbus.SystemBus()

2152

2494

# End of Avahi example code

2158

2500

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

2159

2501

do_not_queue=True))

2160

2502

except dbus.exceptions.NameExistsException as e:

2161

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

2503

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

2162

2504

use_dbus = False

2163

2505

server_settings["use_dbus"] = False

2164

2506

tcp_server.use_dbus = False

2176

2518

2177

2519

client_class = Client

2178

2520

if use_dbus:

2179

client_class = functools.partial(ClientDBusTransitional,

2180

bus = bus)

2181

2182

special_settings = {

2183

# Some settings need to be accessd by special methods;

2184

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

2185

"approved_by_default":

2186

lambda section:

2187

client_config.getboolean(section, "approved_by_default"),

2188

"enabled":

2189

lambda section:

2190

client_config.getboolean(section, "enabled"),

2191

}

2192

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

2193

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

2194

# with exceptions for any special settings as defined above

2195

client_settings = dict((clientname,

2196

dict((setting,

2197

(value

2198

if setting not in special_settings

2199

else special_settings[setting]

2200

(clientname)))

2201

for setting, value in

2202

client_config.items(clientname)))

2203

for clientname in client_config.sections())

2204

2521

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

2522

2523

client_settings = Client.config_parser(client_config)

2205

2524

old_client_settings = {}

2206

clients_data = []

2525

clients_data = {}

2207

2526

2208

2527

# Get client data and settings from last running state.

2209

2528

if server_settings["restore"]:

2213

2532

(stored_state))

2214

2533

os.remove(stored_state_path)

2215

2534

except IOError as e:

2216

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

2217

.format(e))

2218

if e.errno != errno.ENOENT:

2535

if e.errno == errno.ENOENT:

2536

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

2537

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

2538

else:

2539

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

2540

exc_info=e)

2219

2541

raise

2542

except EOFError as e:

2543

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

2544

"EOFError:", exc_info=e)

2220

2545

2221

2546

with PGPEngine() as pgp:

2222

for client in clients_data:

2223

client_name = client["name"]

2224

2547

for client_name, client in clients_data.iteritems():

2225

2548

# Decide which value to use after restoring saved state.

2226

2549

# We have three different values: Old config file,

2227

2550

# new config file, and saved state.

2235

2558

if (name != "secret" and

2236

2559

value != old_client_settings[client_name]

2237

2560

[name]):

2238

setattr(client, name, value)

2561

client[name] = value

2239

2562

except KeyError:

2240

2563

pass

2241

2564

2242

2565

# Clients who has passed its expire date can still be

2243

# enabled if its last checker was sucessful. Clients

2244

# whose checker failed before we stored its state is

2245

# assumed to have failed all checkers during downtime.

2246

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

2247

if ((datetime.datetime.utcnow()

2248

- client["last_checked_ok"])

2249

> client["interval"]):

2250

if client["last_checker_status"] != 0:

2566

# enabled if its last checker was successful. Clients

2567

# whose checker succeeded before we stored its state is

2568

# assumed to have successfully run all checkers during

2569

# downtime.

2570

if client["enabled"]:

2571

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

2572

if not client["last_checked_ok"]:

2573

logger.warning(

2574

"disabling client {0} - Client never "

2575

"performed a successful checker"

2576

.format(client_name))

2577

client["enabled"] = False

2578

elif client["last_checker_status"] != 0:

2579

logger.warning(

2580

"disabling client {0} - Client "

2581

"last checker failed with error code {1}"

2582

.format(client_name,

2583

client["last_checker_status"]))

2251

2584

client["enabled"] = False

2252

2585

else:

2253

2586

client["expires"] = (datetime.datetime

2254

2587

.utcnow()

2255

2588

+ client["timeout"])

2256

2257

client["changedstate"] = (multiprocessing_manager

2258

.Condition

2259

(multiprocessing_manager

2260

.Lock()))

2261

if use_dbus:

2262

new_client = (ClientDBusTransitional.__new__

2263

(ClientDBusTransitional))

2264

tcp_server.clients[client_name] = new_client

2265

new_client.bus = bus

2266

for name, value in client.iteritems():

2267

setattr(new_client, name, value)

2268

client_object_name = unicode(client_name).translate(

2269

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

2270

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

2271

new_client.dbus_object_path = (dbus.ObjectPath

2272

("/clients/"

2273

+ client_object_name))

2274

DBusObjectWithProperties.__init__(new_client,

2275

new_client.bus,

2276

new_client

2277

.dbus_object_path)

2278

else:

2279

tcp_server.clients[client_name] = (Client.__new__

2280

(Client))

2281

for name, value in client.iteritems():

2282

setattr(tcp_server.clients[client_name],

2283

name, value)

2284

2589

logger.debug("Last checker succeeded,"

2590

" keeping {0} enabled"

2591

.format(client_name))

2285

2592

try:

2286

tcp_server.clients[client_name].secret = (

2287

pgp.decrypt(tcp_server.clients[client_name]

2288

.encrypted_secret,

2593

client["secret"] = (

2594

pgp.decrypt(client["encrypted_secret"],

2289

2595

client_settings[client_name]

2290

2596

["secret"]))

2291

2597

except PGPError:

2292

2598

# If decryption fails, we use secret from new settings

2293

tcp_server.clients[client_name].secret = (

2599

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

2600

.format(client_name))

2601

client["secret"] = (

2294

2602

client_settings[client_name]["secret"])

2295

2603

2296

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

2297

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

2298

del tcp_server.clients[clientname]

2299

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

2300

tcp_server.clients[clientname] = (client_class(name

2301

= clientname,

2302

config =

2303

client_settings

2304

[clientname]))

2604

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

2605

for client_name in (set(old_client_settings)

2606

- set(client_settings)):

2607

del clients_data[client_name]

2608

for client_name in (set(client_settings)

2609

- set(old_client_settings)):

2610

clients_data[client_name] = client_settings[client_name]

2611

2612

# Create all client objects

2613

for client_name, client in clients_data.iteritems():

2614

tcp_server.clients[client_name] = client_class(

2615

name = client_name, settings = client)

2305

2616

2306

2617

if not tcp_server.clients:

2307

2618

logger.warning("No clients defined")

2308

2309

if not debug:

2310

try:

2311

with pidfile:

2312

pid = os.getpid()

2313

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

2314

del pidfile

2315

except IOError:

2316

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

2317

pidfilename, pid)

2318

except NameError:

2319

# "pidfile" was never created

2320

pass

2619

2620

if not foreground:

2621

if pidfile is not None:

2622

try:

2623

with pidfile:

2624

pid = os.getpid()

2625

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

2626

except IOError:

2627

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

2628

pidfilename, pid)

2629

del pidfile

2321

2630

del pidfilename

2322

2323

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

2324

2631

2325

2632

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

2326

2633

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

2327

2634

2328

2635

if use_dbus:

2329

class MandosDBusService(dbus.service.Object):

2636

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

2637

"se.bsnet.fukt.Mandos"})

2638

class MandosDBusService(DBusObjectWithProperties):

2330

2639

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

2331

2640

def __init__(self):

2332

2641

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

2333

2642

_interface = "se.recompile.Mandos"

2334

2643

2644

@dbus_interface_annotations(_interface)

2645

def _foo(self):

2646

return { "org.freedesktop.DBus.Property"

2647

".EmitsChangedSignal":

2648

"false"}

2649

2335

2650

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

2336

2651

def ClientAdded(self, objpath):

2337

2652

"D-Bus signal"

2379

2694

2380

2695

del _interface

2381

2696

2382

class MandosDBusServiceTransitional(MandosDBusService):

2383

__metaclass__ = AlternateDBusNamesMetaclass

2384

mandos_dbus_service = MandosDBusServiceTransitional()

2697

mandos_dbus_service = MandosDBusService()

2385

2698

2386

2699

def cleanup():

2387

2700

"Cleanup function; run on exit"

2394

2707

# Store client before exiting. Secrets are encrypted with key

2395

2708

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

2396

2709

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

2397

clients = []

2710

clients = {}

2398

2711

with PGPEngine() as pgp:

2399

2712

for client in tcp_server.clients.itervalues():

2400

2713

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

2402

2715

key)

2403

2716

client_dict = {}

2404

2717

2405

# A list of attributes that will not be stored when

2406

# shutting down.

2407

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

2718

# A list of attributes that can not be pickled

2719

# + secret.

2720

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

2721

"checker"))

2408

2722

for name, typ in (inspect.getmembers

2409

2723

(dbus.service.Object)):

2410

2724

exclude.add(name)

2415

2729

if attr not in exclude:

2416

2730

client_dict[attr] = getattr(client, attr)

2417

2731

2418

clients.append(client_dict)

2732

clients[client.name] = client_dict

2419

2733

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

2420

2734

2421

2735

try:

2422

with os.fdopen(os.open(stored_state_path,

2423

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

2424

0600), "wb") as stored_state:

2736

with (tempfile.NamedTemporaryFile

2737

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

2738

dir=os.path.dirname(stored_state_path),

2739

delete=False)) as stored_state:

2425

2740

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

2741

tempname=stored_state.name

2742

os.rename(tempname, stored_state_path)

2426

2743

except (IOError, OSError) as e:

2427

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

2428

.format(e))

2429

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

2430

raise

2744

if not debug:

2745

try:

2746

os.remove(tempname)

2747

except NameError:

2748

pass

2749

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

2750

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

2751

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

2752

else:

2753

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

2754

exc_info=e)

2755

raise e

2431

2756

2432

2757

# Delete all clients, and settings from config

2433

2758

while tcp_server.clients:

2460

2785

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

2461

2786

if use_ipv6:

2462

2787

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

2463

" flowinfo %d, scope_id %d"

2464

% tcp_server.socket.getsockname())

2788

" flowinfo %d, scope_id %d",

2789

*tcp_server.socket.getsockname())

2465

2790

else: # IPv4

2466

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

2467

% tcp_server.socket.getsockname())

2791

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

2792

*tcp_server.socket.getsockname())

2468

2793

2469

2794

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

2470

2795

2473

2798

try:

2474

2799

service.activate()

2475

2800

except dbus.exceptions.DBusException as error:

2476

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

2801

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

2477

2802

cleanup()

2478

2803

sys.exit(1)

2479

2804

# End of Avahi example code

2486

2811

logger.debug("Starting main loop")

2487

2812

main_loop.run()

2488

2813

except AvahiError as error:

2489

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

2814

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

2490

2815

cleanup()

2491

2816

sys.exit(1)

2492

2817

except KeyboardInterrupt:

2497

2822

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

2498

2823

cleanup()

2499

2824

2500

2501

2825

if __name__ == '__main__':

2502

2826

main()