/mandos/trunk : revision 518.2.3

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import dbus

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import dbus.service

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.6.0"

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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return interface_index

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

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def initlogger(level=logging.WARNING):

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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"""Exception if encryption/decryption fails"""

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class CryptoError(Exception):

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pass

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class PGPEngine(object):

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class Crypto(object):

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"""A simple class for OpenPGP symmetric encryption & decryption"""

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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self.gnupg.options.extra_args.extend(['--force-mdc',

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'--quiet',

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'--no-use-agent'])

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'--quiet'])

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def __enter__(self):

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return self

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

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

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self._cleanup()

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return False

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def encrypt(self, data, password):

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

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

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with open(os.devnull) as devnull:

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try:

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

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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raise CryptoError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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raise CryptoError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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class AvahiError(Exception):

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def __init__(self, value, *args, **kwargs):

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self.value = value

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self, interface = avahi.IF_UNSPEC, name = None,

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servicetype = None, port = None, TXT = None,

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domain = "", host = "", max_renames = 32768,

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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pass

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self.group = None

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self.remove()

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def server_state_changed(self, state, error=None):

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

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

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logger.debug("Unknown state: %r", state)

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else:

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logger.debug("Unknown state: %r: %r", state, error)

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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self.server_state_changed(self.server.GetState())

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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"""Add the new name to the syslog messages"""

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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

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

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% self.name))

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return ret

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def timedelta_to_milliseconds(td):

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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checker, or None.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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return _timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return _timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return _timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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return _timedelta_to_milliseconds(self.approval_delay)

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

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

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

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attribute."""

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self.name = name

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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if config is None:

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config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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if "secret" in config:

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

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elif "secfile" in config:

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

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(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

471

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)

477

self.last_approval_request = None

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if self.enabled:

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self.last_enabled = datetime.datetime.utcnow()

480

else:

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self.last_enabled = None

482

self.last_checked_ok = None

483

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

486

["extended_timeout"])

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

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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if self.enabled:

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

493

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

553

self.approved = None

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self._approved = None

499

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

500

True)

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self.approvals_pending = 0

502

self.approval_delay = string_to_delta(

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config["approval_delay"])

504

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

557

508

.Lock()))

577

528

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

578

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# Already enabled

579

530

return

531

self.send_changedstate()

580

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

581

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self.enabled = True

582

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self.last_enabled = datetime.datetime.utcnow()

583

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self.init_checker()

584

self.send_changedstate()

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536

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def disable(self, quiet=True):

587

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"""Disable this client."""

588

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

589

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return False

590

541

if not quiet:

542

self.send_changedstate()

543

if not quiet:

591

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

592

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

545

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

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gobject.source_remove(self.disable_initiator_tag)

594

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self.disable_initiator_tag = None

595

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self.expires = None

596

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

549

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

597

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gobject.source_remove(self.checker_initiator_tag)

598

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self.checker_initiator_tag = None

599

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self.stop_checker()

600

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self.enabled = False

601

if not quiet:

602

self.send_changedstate()

603

554

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

604

555

return False

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609

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def init_checker(self):

610

561

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

611

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# and every interval from then on.

612

if self.checker_initiator_tag is not None:

613

gobject.source_remove(self.checker_initiator_tag)

614

563

self.checker_initiator_tag = (gobject.timeout_add

615

564

(self.interval_milliseconds(),

616

565

self.start_checker))

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566

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

618

if self.disable_initiator_tag is not None:

619

gobject.source_remove(self.disable_initiator_tag)

620

567

self.disable_initiator_tag = (gobject.timeout_add

621

568

(self.timeout_milliseconds(),

622

569

self.disable))

628

575

self.checker_callback_tag = None

629

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self.checker = None

630

577

if os.WIFEXITED(condition):

631

self.last_checker_status = os.WEXITSTATUS(condition)

578

self.last_checker_status = os.WEXITSTATUS(condition)

632

579

if self.last_checker_status == 0:

633

580

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

634

581

vars(self))

641

588

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

642

589

vars(self))

643

590

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."""

591

def checked_ok(self, timeout=None):

592

"""Bump up the timeout for this client.

593

594

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

595

alive and well.

596

"""

652

597

if timeout is None:

653

598

timeout = self.timeout

599

self.last_checked_ok = datetime.datetime.utcnow()

654

600

if self.disable_initiator_tag is not None:

655

601

gobject.source_remove(self.disable_initiator_tag)

656

self.disable_initiator_tag = None

657

602

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

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603

self.disable_initiator_tag = (gobject.timeout_add

659

(timedelta_to_milliseconds

604

(_timedelta_to_milliseconds

660

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(timeout), self.disable))

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

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607

669

614

If a checker already exists, leave it running and do

670

615

nothing."""

671

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

672

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

673

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

674

# would inevitably timeout, since no checker would get a

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

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

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

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# client would inevitably timeout, since no checker would get

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

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

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622

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

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623

# should be.

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self.current_checker_command)

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# Start a new checker if needed

694

639

if self.checker is None:

695

# Escape attributes for the shell

696

escaped_attrs = dict(

697

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

698

for attr in

699

self.runtime_expansions)

700

640

try:

701

command = self.checker_command % escaped_attrs

702

except TypeError as error:

703

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

704

self.checker_command, exc_info=error)

705

return True # Try again later

641

# In case checker_command has exactly one % operator

642

command = self.checker_command % self.host

643

except TypeError:

644

# Escape attributes for the shell

645

escaped_attrs = dict(

646

(attr,

647

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

648

errors=

649

'replace')))

650

for attr in

651

self.runtime_expansions)

652

653

try:

654

command = self.checker_command % escaped_attrs

655

except TypeError as error:

656

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

657

' %s', self.checker_command, error)

658

return True # Try again later

706

659

self.current_checker_command = command

707

660

try:

708

661

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

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667

self.checker = subprocess.Popen(command,

715

668

close_fds=True,

716

669

shell=True, cwd="/")

670

self.checker_callback_tag = (gobject.child_watch_add

671

(self.checker.pid,

672

self.checker_callback,

673

data=command))

674

# The checker may have completed before the gobject

675

# watch was added. Check for this.

676

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

677

if pid:

678

gobject.source_remove(self.checker_callback_tag)

679

self.checker_callback(pid, status, command)

717

680

except OSError as error:

718

logger.error("Failed to start subprocess",

719

exc_info=error)

720

self.checker_callback_tag = (gobject.child_watch_add

721

(self.checker.pid,

722

self.checker_callback,

723

data=command))

724

# The checker may have completed before the gobject

725

# watch was added. Check for this.

726

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

727

if pid:

728

gobject.source_remove(self.checker_callback_tag)

729

self.checker_callback(pid, status, command)

681

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

682

error)

730

683

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

731

684

return True

732

685

739

692

return

740

693

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

741

694

try:

742

self.checker.terminate()

695

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

743

696

#time.sleep(0.5)

744

697

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

745

# self.checker.kill()

698

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

746

699

except OSError as error:

747

700

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

748

701

raise

765

718

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

766

719

if byte_arrays and signature != "ay":

767

720

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

768

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

721

" signature %r" % signature)

769

722

def decorator(func):

770

723

func._dbus_is_property = True

771

724

func._dbus_interface = dbus_interface

779

732

return decorator

780

733

781

734

782

def dbus_interface_annotations(dbus_interface):

783

"""Decorator for marking functions returning interface annotations

784

785

Usage:

786

787

@dbus_interface_annotations("org.example.Interface")

788

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

789

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

790

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

791

"false"}

792

"""

793

def decorator(func):

794

func._dbus_is_interface = True

795

func._dbus_interface = dbus_interface

796

func._dbus_name = dbus_interface

797

return func

798

return decorator

799

800

801

def dbus_annotations(annotations):

802

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

803

Usage:

804

805

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

806

access="r")

807

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

808

"org.freedesktop.DBus.Property."

809

"EmitsChangedSignal": "false"})

810

def Property_dbus_property(self):

811

return dbus.Boolean(False)

812

"""

813

def decorator(func):

814

func._dbus_annotations = annotations

815

return func

816

return decorator

817

818

819

735

class DBusPropertyException(dbus.exceptions.DBusException):

820

736

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

821

737

"""

844

760

"""

845

761

846

762

@staticmethod

847

def _is_dbus_thing(thing):

848

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

849

850

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

851

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

852

"""

853

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

854

False)

763

def _is_dbus_property(obj):

764

return getattr(obj, "_dbus_is_property", False)

855

765

856

def _get_all_dbus_things(self, thing):

766

def _get_all_dbus_properties(self):

857

767

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

858

768

"""

859

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

860

name),

861

athing.__get__(self))

769

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

862

770

for cls in self.__class__.__mro__

863

for name, athing in

864

inspect.getmembers(cls,

865

self._is_dbus_thing(thing)))

771

for name, prop in

772

inspect.getmembers(cls, self._is_dbus_property))

866

773

867

774

def _get_dbus_property(self, interface_name, property_name):

868

775

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

870

777

"""

871

778

for cls in self.__class__.__mro__:

872

779

for name, value in (inspect.getmembers

873

(cls,

874

self._is_dbus_thing("property"))):

780

(cls, self._is_dbus_property)):

875

781

if (value._dbus_name == property_name

876

782

and value._dbus_interface == interface_name):

877

783

return value.__get__(self)

906

812

# signatures other than "ay".

907

813

if prop._dbus_signature != "ay":

908

814

raise ValueError

909

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

910

for byte in value))

815

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

816

for byte in value))

911

817

prop(value)

912

818

913

819

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

919

825

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

920

826

"""

921

827

properties = {}

922

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

828

for name, prop in self._get_all_dbus_properties():

923

829

if (interface_name

924

830

and interface_name != prop._dbus_interface):

925

831

# Interface non-empty but did not match

940

846

path_keyword='object_path',

941

847

connection_keyword='connection')

942

848

def Introspect(self, object_path, connection):

943

"""Overloading of standard D-Bus method.

944

945

Inserts property tags and interface annotation tags.

849

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

946

850

"""

947

851

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

948

852

connection)

955

859

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

956

860

return e

957

861

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

958

# Add property tags

959

862

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

960

863

for name, prop

961

in self._get_all_dbus_things("property")

864

in self._get_all_dbus_properties()

962

865

if prop._dbus_interface

963

866

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

964

867

if_tag.appendChild(tag)

965

# Add annotation tags

966

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

967

for tag in if_tag.getElementsByTagName(typ):

968

annots = dict()

969

for name, prop in (self.

970

_get_all_dbus_things(typ)):

971

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

972

and prop._dbus_interface

973

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

974

annots.update(getattr

975

(prop,

976

"_dbus_annotations",

977

{}))

978

for name, value in annots.iteritems():

979

ann_tag = document.createElement(

980

"annotation")

981

ann_tag.setAttribute("name", name)

982

ann_tag.setAttribute("value", value)

983

tag.appendChild(ann_tag)

984

# Add interface annotation tags

985

for annotation, value in dict(

986

itertools.chain.from_iterable(

987

annotations().iteritems()

988

for name, annotations in

989

self._get_all_dbus_things("interface")

990

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

991

)).iteritems():

992

ann_tag = document.createElement("annotation")

993

ann_tag.setAttribute("name", annotation)

994

ann_tag.setAttribute("value", value)

995

if_tag.appendChild(ann_tag)

996

868

# Add the names to the return values for the

997

869

# "org.freedesktop.DBus.Properties" methods

998

870

if (if_tag.getAttribute("name")

1013

885

except (AttributeError, xml.dom.DOMException,

1014

886

xml.parsers.expat.ExpatError) as error:

1015

887

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

1016

exc_info=error)

888

error)

1017

889

return xmlstring

1018

890

1019

891

1020

def datetime_to_dbus(dt, variant_level=0):

892

def datetime_to_dbus (dt, variant_level=0):

1021

893

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

1022

894

if dt is None:

1023

895

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

1025

897

variant_level=variant_level)

1026

898

1027

899

1028

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1029

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

1030

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

1031

interface names according to the "alt_interface_names" mapping.

1032

Usage:

1033

1034

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

1035

"net.example.AlternateInterface"})

1036

class SampleDBusObject(dbus.service.Object):

1037

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

1038

def SampleDBusMethod():

1039

pass

1040

1041

The above "SampleDBusMethod" on "SampleDBusObject" will be

1042

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

1043

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

1044

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

1045

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

1046

1047

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

1048

(from DBusObjectWithProperties) and interfaces (from the

1049

dbus_interface_annotations decorator).

900

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

901

.__metaclass__):

902

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

903

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

1050

904

"""

1051

def wrapper(cls):

1052

for orig_interface_name, alt_interface_name in (

1053

alt_interface_names.iteritems()):

1054

attr = {}

1055

interface_names = set()

1056

# Go though all attributes of the class

1057

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

905

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

906

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

907

# methods, signals, or properties in them

908

for base in (b for b in bases

909

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

910

# Go though all attributes of the base class

911

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

1058

912

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

1059

913

# with the wrong interface name

1060

914

if (not hasattr(attribute, "_dbus_interface")

1061

915

or not attribute._dbus_interface

1062

.startswith(orig_interface_name)):

916

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

1063

917

continue

1064

918

# Create an alternate D-Bus interface name based on

1065

919

# the current name

1066

920

alt_interface = (attribute._dbus_interface

1067

.replace(orig_interface_name,

1068

alt_interface_name))

1069

interface_names.add(alt_interface)

921

.replace("se.recompile.Mandos",

922

"se.bsnet.fukt.Mandos"))

1070

923

# Is this a D-Bus signal?

1071

924

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

1072

925

# Extract the original non-method function by

1087

940

nonmethod_func.func_name,

1088

941

nonmethod_func.func_defaults,

1089

942

nonmethod_func.func_closure)))

1090

# Copy annotations, if any

1091

try:

1092

new_function._dbus_annotations = (

1093

dict(attribute._dbus_annotations))

1094

except AttributeError:

1095

pass

1096

943

# Define a creator of a function to call both the

1097

# original and alternate functions, so both the

1098

# original and alternate signals gets sent when

1099

# the function is called

944

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

945

# signals gets sent when the function is called

1100

946

def fixscope(func1, func2):

1101

947

"""This function is a scope container to pass

1102

948

func1 and func2 to the "call_both" function

1109

955

return call_both

1110

956

# Create the "call_both" function and add it to

1111

957

# the class

1112

attr[attrname] = fixscope(attribute, new_function)

958

attr[attrname] = fixscope(attribute,

959

new_function)

1113

960

# Is this a D-Bus method?

1114

961

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

1115

962

# Create a new, but exactly alike, function

1126

973

attribute.func_name,

1127

974

attribute.func_defaults,

1128

975

attribute.func_closure)))

1129

# Copy annotations, if any

1130

try:

1131

attr[attrname]._dbus_annotations = (

1132

dict(attribute._dbus_annotations))

1133

except AttributeError:

1134

pass

1135

976

# Is this a D-Bus property?

1136

977

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

1137

978

# Create a new, but exactly alike, function

1151

992

attribute.func_name,

1152

993

attribute.func_defaults,

1153

994

attribute.func_closure)))

1154

# Copy annotations, if any

1155

try:

1156

attr[attrname]._dbus_annotations = (

1157

dict(attribute._dbus_annotations))

1158

except AttributeError:

1159

pass

1160

# Is this a D-Bus interface?

1161

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

1162

# Create a new, but exactly alike, function

1163

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

1164

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

1165

# to the class.

1166

attr[attrname] = (dbus_interface_annotations

1167

(alt_interface)

1168

(types.FunctionType

1169

(attribute.func_code,

1170

attribute.func_globals,

1171

attribute.func_name,

1172

attribute.func_defaults,

1173

attribute.func_closure)))

1174

if deprecate:

1175

# Deprecate all alternate interfaces

1176

iname="_AlternateDBusNames_interface_annotation{0}"

1177

for interface_name in interface_names:

1178

@dbus_interface_annotations(interface_name)

1179

def func(self):

1180

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

1181

"true" }

1182

# Find an unused name

1183

for aname in (iname.format(i)

1184

for i in itertools.count()):

1185

if aname not in attr:

1186

attr[aname] = func

1187

break

1188

if interface_names:

1189

# Replace the class with a new subclass of it with

1190

# methods, signals, etc. as created above.

1191

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

1192

(cls,), attr)

1193

return cls

1194

return wrapper

1195

1196

1197

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

1198

"se.bsnet.fukt.Mandos"})

995

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

996

997

1199

998

class ClientDBus(Client, DBusObjectWithProperties):

1200

999

"""A Client class using D-Bus

1201

1000

1212

1011

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

1213

1012

self.bus = bus

1214

1013

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

1014

1015

self._approvals_pending = 0

1215

1016

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

1216

1017

# the D-Bus

1217

1018

client_object_name = unicode(self.name).translate(

1221

1022

("/clients/" + client_object_name))

1222

1023

DBusObjectWithProperties.__init__(self, self.bus,

1223

1024

self.dbus_object_path)

1224

1025

1225

1026

def notifychangeproperty(transform_func,

1226

1027

dbus_name, type_func=lambda x: x,

1227

1028

variant_level=1):

1250

1051

1251

1052

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

1252

1053

1054

1253

1055

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1254

1056

approvals_pending = notifychangeproperty(dbus.Boolean,

1255

1057

"ApprovalPending",

1262

1064

checker is not None)

1263

1065

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1264

1066

"LastCheckedOK")

1265

last_checker_status = notifychangeproperty(dbus.Int16,

1266

"LastCheckerStatus")

1267

1067

last_approval_request = notifychangeproperty(

1268

1068

datetime_to_dbus, "LastApprovalRequest")

1269

1069

approved_by_default = notifychangeproperty(dbus.Boolean,

1270

1070

"ApprovedByDefault")

1271

approval_delay = notifychangeproperty(dbus.UInt64,

1071

approval_delay = notifychangeproperty(dbus.UInt16,

1272

1072

"ApprovalDelay",

1273

1073

type_func =

1274

timedelta_to_milliseconds)

1074

_timedelta_to_milliseconds)

1275

1075

approval_duration = notifychangeproperty(

1276

dbus.UInt64, "ApprovalDuration",

1277

type_func = timedelta_to_milliseconds)

1076

dbus.UInt16, "ApprovalDuration",

1077

type_func = _timedelta_to_milliseconds)

1278

1078

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

1279

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

1079

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

1280

1080

type_func =

1281

timedelta_to_milliseconds)

1081

_timedelta_to_milliseconds)

1282

1082

extended_timeout = notifychangeproperty(

1283

dbus.UInt64, "ExtendedTimeout",

1284

type_func = timedelta_to_milliseconds)

1285

interval = notifychangeproperty(dbus.UInt64,

1083

dbus.UInt16, "ExtendedTimeout",

1084

type_func = _timedelta_to_milliseconds)

1085

interval = notifychangeproperty(dbus.UInt16,

1286

1086

"Interval",

1287

1087

type_func =

1288

timedelta_to_milliseconds)

1088

_timedelta_to_milliseconds)

1289

1089

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

1290

1090

1291

1091

del notifychangeproperty

1333

1133

return r

1334

1134

1335

1135

def _reset_approved(self):

1336

self.approved = None

1136

self._approved = None

1337

1137

return False

1338

1138

1339

1139

def approve(self, value=True):

1340

self.approved = value

1341

gobject.timeout_add(timedelta_to_milliseconds

1140

self.send_changedstate()

1141

self._approved = value

1142

gobject.timeout_add(_timedelta_to_milliseconds

1342

1143

(self.approval_duration),

1343

1144

self._reset_approved)

1344

self.send_changedstate()

1145

1345

1146

1346

1147

## D-Bus methods, signals & properties

1347

1148

_interface = "se.recompile.Mandos.Client"

1348

1149

1349

## Interfaces

1350

1351

@dbus_interface_annotations(_interface)

1352

def _foo(self):

1353

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

1354

"false"}

1355

1356

1150

## Signals

1357

1151

1358

1152

# CheckerCompleted - signal

1394

1188

"D-Bus signal"

1395

1189

return self.need_approval()

1396

1190

1191

# NeRwequest - signal

1192

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

1193

def NewRequest(self, ip):

1194

"""D-Bus signal

1195

Is sent after a client request a password.

1196

"""

1197

pass

1198

1397

1199

## Methods

1398

1200

1399

1201

# Approve - method

1457

1259

access="readwrite")

1458

1260

def ApprovalDuration_dbus_property(self, value=None):

1459

1261

if value is None: # get

1460

return dbus.UInt64(timedelta_to_milliseconds(

1262

return dbus.UInt64(_timedelta_to_milliseconds(

1461

1263

self.approval_duration))

1462

1264

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

1463

1265

1477

1279

def Host_dbus_property(self, value=None):

1478

1280

if value is None: # get

1479

1281

return dbus.String(self.host)

1480

self.host = unicode(value)

1282

self.host = value

1481

1283

1482

1284

# Created - property

1483

1285

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

1509

1311

return

1510

1312

return datetime_to_dbus(self.last_checked_ok)

1511

1313

1512

# LastCheckerStatus - property

1513

@dbus_service_property(_interface, signature="n",

1514

access="read")

1515

def LastCheckerStatus_dbus_property(self):

1516

return dbus.Int16(self.last_checker_status)

1517

1518

1314

# Expires - property

1519

1315

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

1520

1316

def Expires_dbus_property(self):

1531

1327

def Timeout_dbus_property(self, value=None):

1532

1328

if value is None: # get

1533

1329

return dbus.UInt64(self.timeout_milliseconds())

1534

old_timeout = self.timeout

1535

1330

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

1536

# Reschedule disabling

1537

if self.enabled:

1538

now = datetime.datetime.utcnow()

1539

self.expires += self.timeout - old_timeout

1540

if self.expires <= now:

1541

# The timeout has passed

1542

self.disable()

1543

else:

1544

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

1545

is None):

1546

return

1547

gobject.source_remove(self.disable_initiator_tag)

1548

self.disable_initiator_tag = (

1549

gobject.timeout_add(

1550

timedelta_to_milliseconds(self.expires - now),

1551

self.disable))

1331

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

1332

return

1333

# Reschedule timeout

1334

gobject.source_remove(self.disable_initiator_tag)

1335

self.disable_initiator_tag = None

1336

self.expires = None

1337

time_to_die = _timedelta_to_milliseconds((self

1338

.last_checked_ok

1339

+ self.timeout)

1340

- datetime.datetime

1341

.utcnow())

1342

if time_to_die <= 0:

1343

# The timeout has passed

1344

self.disable()

1345

else:

1346

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

1347

+ datetime.timedelta(milliseconds =

1348

time_to_die))

1349

self.disable_initiator_tag = (gobject.timeout_add

1350

(time_to_die, self.disable))

1552

1351

1553

1352

# ExtendedTimeout - property

1554

1353

@dbus_service_property(_interface, signature="t",

1580

1379

def Checker_dbus_property(self, value=None):

1581

1380

if value is None: # get

1582

1381

return dbus.String(self.checker_command)

1583

self.checker_command = unicode(value)

1382

self.checker_command = value

1584

1383

1585

1384

# CheckerRunning - property

1586

1385

@dbus_service_property(_interface, signature="b",

1615

1414

raise KeyError()

1616

1415

1617

1416

def __getattribute__(self, name):

1618

if name == '_pipe':

1417

if(name == '_pipe'):

1619

1418

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

1620

1419

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

1621

1420

data = self._pipe.recv()

1628

1427

return func

1629

1428

1630

1429

def __setattr__(self, name, value):

1631

if name == '_pipe':

1430

if(name == '_pipe'):

1632

1431

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

1633

1432

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

1634

1433

1635

1434

1435

class ClientDBusTransitional(ClientDBus):

1436

__metaclass__ = AlternateDBusNamesMetaclass

1437

1438

1636

1439

class ClientHandler(socketserver.BaseRequestHandler, object):

1637

1440

"""A class to handle client connections.

1638

1441

1699

1502

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

1700

1503

return

1701

1504

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

1505

if self.server.use_dbus:

1506

# Emit D-Bus signal

1507

client.NewRequest(str(self.client_address))

1702

1508

1703

1509

try:

1704

1510

client = ProxyClient(child_pipe, fpr,

1720

1526

client.Rejected("Disabled")

1721

1527

return

1722

1528

1723

if client.approved or not client.approval_delay:

1529

if client._approved or not client.approval_delay:

1724

1530

#We are approved or approval is disabled

1725

1531

break

1726

elif client.approved is None:

1532

elif client._approved is None:

1727

1533

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

1728

1534

client.name)

1729

1535

if self.server.use_dbus:

1742

1548

#wait until timeout or approved

1743

1549

time = datetime.datetime.now()

1744

1550

client.changedstate.acquire()

1745

client.changedstate.wait(

1746

float(timedelta_to_milliseconds(delay)

1747

/ 1000))

1551

(client.changedstate.wait

1552

(float(client._timedelta_to_milliseconds(delay)

1553

/ 1000)))

1748

1554

client.changedstate.release()

1749

1555

time2 = datetime.datetime.now()

1750

1556

if (time2 - time) >= delay:

1766

1572

try:

1767

1573

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

1768

1574

except gnutls.errors.GNUTLSError as error:

1769

logger.warning("gnutls send failed",

1770

exc_info=error)

1575

logger.warning("gnutls send failed")

1771

1576

return

1772

1577

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

1773

1578

sent, len(client.secret)

1776

1581

1777

1582

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

1778

1583

# bump the timeout using extended_timeout

1779

client.bump_timeout(client.extended_timeout)

1584

client.checked_ok(client.extended_timeout)

1780

1585

if self.server.use_dbus:

1781

1586

# Emit D-Bus signal

1782

1587

client.GotSecret()

1787

1592

try:

1788

1593

session.bye()

1789

1594

except gnutls.errors.GNUTLSError as error:

1790

logger.warning("GnuTLS bye failed",

1791

exc_info=error)

1595

logger.warning("GnuTLS bye failed")

1792

1596

1793

1597

@staticmethod

1794

1598

def peer_certificate(session):

1859

1663

def sub_process_main(self, request, address):

1860

1664

try:

1861

1665

self.finish_request(request, address)

1862

except Exception:

1666

except:

1863

1667

self.handle_error(request, address)

1864

1668

self.close_request(request)

1865

1669

1866

1670

def process_request(self, request, address):

1867

1671

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

1868

1672

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

1869

args = (request, address))

1673

args = (request,

1674

address))

1870

1675

proc.start()

1871

1676

return proc

1872

1677

1900

1705

use_ipv6: Boolean; to use IPv6 or not

1901

1706

"""

1902

1707

def __init__(self, server_address, RequestHandlerClass,

1903

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

1904

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

1905

creating a new one with socket.socket().

1906

"""

1708

interface=None, use_ipv6=True):

1907

1709

self.interface = interface

1908

1710

if use_ipv6:

1909

1711

self.address_family = socket.AF_INET6

1910

if socketfd is not None:

1911

# Save the file descriptor

1912

self.socketfd = socketfd

1913

# Save the original socket.socket() function

1914

self.socket_socket = socket.socket

1915

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

1916

#

1917

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

1918

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

1919

# patching socket.socket.)

1920

#

1921

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

1922

@functools.wraps(socket.socket)

1923

def socket_wrapper(*args, **kwargs):

1924

# Restore original function so subsequent calls are

1925

# not affected.

1926

socket.socket = self.socket_socket

1927

del self.socket_socket

1928

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

1929

# saved file descriptor.

1930

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

1931

# Replace socket.socket() function with wrapper

1932

socket.socket = socket_wrapper

1933

# The socketserver.TCPServer.__init__ will call

1934

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

1935

# socket_wrapper(), if socketfd was set.

1936

1712

socketserver.TCPServer.__init__(self, server_address,

1937

1713

RequestHandlerClass)

1938

1939

1714

def server_bind(self):

1940

1715

"""This overrides the normal server_bind() function

1941

1716

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

1949

1724

try:

1950

1725

self.socket.setsockopt(socket.SOL_SOCKET,

1951

1726

SO_BINDTODEVICE,

1952

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

1727

str(self.interface

1728

+ '\0'))

1953

1729

except socket.error as error:

1954

if error.errno == errno.EPERM:

1955

logger.error("No permission to bind to"

1956

" interface %s", self.interface)

1957

elif error.errno == errno.ENOPROTOOPT:

1730

if error[0] == errno.EPERM:

1731

logger.error("No permission to"

1732

" bind to interface %s",

1733

self.interface)

1734

elif error[0] == errno.ENOPROTOOPT:

1958

1735

logger.error("SO_BINDTODEVICE not available;"

1959

1736

" cannot bind to interface %s",

1960

1737

self.interface)

1961

elif error.errno == errno.ENODEV:

1962

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

1963

" cannot bind", self.interface)

1964

1738

else:

1965

1739

raise

1966

1740

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

1996

1770

"""

1997

1771

def __init__(self, server_address, RequestHandlerClass,

1998

1772

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

1999

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

1773

gnutls_priority=None, use_dbus=True):

2000

1774

self.enabled = False

2001

1775

self.clients = clients

2002

1776

if self.clients is None:

2006

1780

IPv6_TCPServer.__init__(self, server_address,

2007

1781

RequestHandlerClass,

2008

1782

interface = interface,

2009

use_ipv6 = use_ipv6,

2010

socketfd = socketfd)

1783

use_ipv6 = use_ipv6)

2011

1784

def server_activate(self):

2012

1785

if self.enabled:

2013

1786

return socketserver.TCPServer.server_activate(self)

2026

1799

2027

1800

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

2028

1801

proc = None, client_object=None):

1802

condition_names = {

1803

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

1804

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

1805

# blocking).

1806

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

1807

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

1808

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

1809

# broken, usually for pipes and

1810

# sockets).

1811

}

1812

conditions_string = ' | '.join(name

1813

for cond, name in

1814

condition_names.iteritems()

1815

if cond & condition)

2029

1816

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

2030

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

1817

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

2031

1818

# Wait for other process to exit

2032

1819

proc.join()

2033

1820

return False

2091

1878

return True

2092

1879

2093

1880

2094

def rfc3339_duration_to_delta(duration):

2095

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

2096

2097

>>> rfc3339_duration_to_delta("P7D")

2098

datetime.timedelta(7)

2099

>>> rfc3339_duration_to_delta("PT60S")

2100

datetime.timedelta(0, 60)

2101

>>> rfc3339_duration_to_delta("PT60M")

2102

datetime.timedelta(0, 3600)

2103

>>> rfc3339_duration_to_delta("PT24H")

2104

datetime.timedelta(1)

2105

>>> rfc3339_duration_to_delta("P1W")

2106

datetime.timedelta(7)

2107

>>> rfc3339_duration_to_delta("PT5M30S")

2108

datetime.timedelta(0, 330)

2109

>>> rfc3339_duration_to_delta("P1DT3M20S")

2110

datetime.timedelta(1, 200)

2111

"""

2112

2113

# Parsing an RFC 3339 duration with regular expressions is not

2114

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

2115

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

2116

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

2117

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

2118

# avoid excessive use of external libraries.

2119

2120

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

2121

Token = collections.namedtuple("Token",

2122

("regexp", # To match token; if

2123

# "value" is not None,

2124

# must have a "group"

2125

# containing digits

2126

"value", # datetime.timedelta or

2127

# None

2128

"followers")) # Tokens valid after

2129

# this token

2130

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

2131

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

2132

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

2133

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

2134

datetime.timedelta(seconds=1),

2135

frozenset((token_end,)))

2136

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

2137

datetime.timedelta(minutes=1),

2138

frozenset((token_second, token_end)))

2139

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

2140

datetime.timedelta(hours=1),

2141

frozenset((token_minute, token_end)))

2142

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

2143

None,

2144

frozenset((token_hour, token_minute,

2145

token_second)))

2146

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

2147

datetime.timedelta(days=1),

2148

frozenset((token_time, token_end)))

2149

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

2150

datetime.timedelta(weeks=4),

2151

frozenset((token_day, token_end)))

2152

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

2153

datetime.timedelta(weeks=52),

2154

frozenset((token_month, token_end)))

2155

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

2156

datetime.timedelta(weeks=1),

2157

frozenset((token_end,)))

2158

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

2159

frozenset((token_year, token_month,

2160

token_day, token_time,

2161

token_week))),

2162

# Define starting values

2163

value = datetime.timedelta() # Value so far

2164

found_token = None

2165

followers = frozenset(token_duration,) # Following valid tokens

2166

s = duration # String left to parse

2167

# Loop until end token is found

2168

while found_token is not token_end:

2169

# Search for any currently valid tokens

2170

for token in followers:

2171

match = token.regexp.match(s)

2172

if match is not None:

2173

# Token found

2174

if token.value is not None:

2175

# Value found, parse digits

2176

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

2177

# Add to value so far

2178

value += factor * token.value

2179

# Strip token from string

2180

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

2181

# Go to found token

2182

found_token = token

2183

# Set valid next tokens

2184

followers = found_token.followers

2185

break

2186

else:

2187

# No currently valid tokens were found

2188

raise ValueError("Invalid RFC 3339 duration")

2189

# End token found

2190

return value

2191

2192

2193

1881

def string_to_delta(interval):

2194

1882

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

2195

1883

2206

1894

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

2207

1895

datetime.timedelta(0, 330)

2208

1896

"""

2209

2210

try:

2211

return rfc3339_duration_to_delta(interval)

2212

except ValueError:

2213

pass

2214

2215

1897

timevalue = datetime.timedelta(0)

2216

1898

for s in interval.split():

2217

1899

try:

2228

1910

elif suffix == "w":

2229

1911

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

2230

1912

else:

2231

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

2232

.format(suffix))

1913

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

2233

1914

except (ValueError, IndexError) as e:

2234

1915

raise ValueError(*(e.args))

2235

1916

timevalue += delta

2249

1930

sys.exit()

2250

1931

if not noclose:

2251

1932

# Close all standard open file descriptors

2252

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

1933

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

2253

1934

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

2254

1935

raise OSError(errno.ENODEV,

2255

"{0} not a character device"

2256

.format(os.devnull))

1936

"%s not a character device"

1937

% os.path.devnull)

2257

1938

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

2258

1939

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

2259

1940

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

2268

1949

2269

1950

parser = argparse.ArgumentParser()

2270

1951

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

2271

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

1952

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

2272

1953

help="show version number and exit")

2273

1954

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

2274

1955

help="Bind to interface IF")

2299

1980

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

2300

1981

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

2301

1982

" state")

2302

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

2303

help="Specify a file descriptor to a network"

2304

" socket to use instead of creating one")

2305

1983

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

2306

1984

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

2307

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

2308

help="Run in foreground")

2309

1985

2310

1986

options = parser.parse_args()

2311

1987

2326

2002

"use_ipv6": "True",

2327

2003

"debuglevel": "",

2328

2004

"restore": "True",

2329

"socket": "",

2330

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

2331

"foreground": "False",

2005

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

2332

2006

}

2333

2007

2334

2008

# Parse config file for server-global settings

2339

2013

# Convert the SafeConfigParser object to a dict

2340

2014

server_settings = server_config.defaults()

2341

2015

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

2342

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

2016

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

2343

2017

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

2344

2018

option)

2345

2019

if server_settings["port"]:

2346

2020

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

2347

2021

"port")

2348

if server_settings["socket"]:

2349

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

2350

"socket")

2351

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

2352

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

2353

# happen with a supplied network socket.

2354

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

2355

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

2356

["socket"])

2357

2022

del server_config

2358

2023

2359

2024

# Override the settings from the config file with command line

2361

2026

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

2362

2027

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

2363

2028

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

2364

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

2029

"statedir"):

2365

2030

value = getattr(options, option)

2366

2031

if value is not None:

2367

2032

server_settings[option] = value

2370

2035

for option in server_settings.keys():

2371

2036

if type(server_settings[option]) is str:

2372

2037

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

2373

# Debug implies foreground

2374

if server_settings["debug"]:

2375

server_settings["foreground"] = True

2376

2038

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

2377

2039

2378

2040

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

2384

2046

use_ipv6 = server_settings["use_ipv6"]

2385

2047

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

2386

2048

stored_state_file)

2387

foreground = server_settings["foreground"]

2388

2049

2389

2050

if debug:

2390

initlogger(debug, logging.DEBUG)

2051

initlogger(logging.DEBUG)

2391

2052

else:

2392

2053

if not debuglevel:

2393

initlogger(debug)

2054

initlogger()

2394

2055

else:

2395

2056

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

2396

initlogger(debug, level)

2057

initlogger(level)

2397

2058

2398

2059

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

2399

2060

syslogger.setFormatter(logging.Formatter

2400

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

2401

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

2402

.format(server_settings

2403

["servicename"])))

2061

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

2062

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

2063

% server_settings["servicename"]))

2404

2064

2405

2065

# Parse config file with clients

2406

client_config = configparser.SafeConfigParser(Client

2407

.client_defaults)

2066

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

2067

"extended_timeout": "15m",

2068

"interval": "2m",

2069

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

2070

"host": "",

2071

"approval_delay": "0s",

2072

"approval_duration": "1s",

2073

}

2074

client_config = configparser.SafeConfigParser(client_defaults)

2408

2075

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

2409

2076

"clients.conf"))

2410

2077

2419

2086

use_ipv6=use_ipv6,

2420

2087

gnutls_priority=

2421

2088

server_settings["priority"],

2422

use_dbus=use_dbus,

2423

socketfd=(server_settings["socket"]

2424

or None))

2425

if not foreground:

2089

use_dbus=use_dbus)

2090

if not debug:

2426

2091

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

2427

pidfile = None

2428

2092

try:

2429

2093

pidfile = open(pidfilename, "w")

2430

except IOError as e:

2431

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

2432

exc_info=e)

2094

except IOError:

2095

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

2433

2096

2434

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

2097

try:

2098

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

2099

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

2100

except KeyError:

2435

2101

try:

2436

uid = pwd.getpwnam(name).pw_uid

2437

gid = pwd.getpwnam(name).pw_gid

2438

break

2102

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

2103

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

2439

2104

except KeyError:

2440

continue

2441

else:

2442

uid = 65534

2443

gid = 65534

2105

try:

2106

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

2107

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

2108

except KeyError:

2109

uid = 65534

2110

gid = 65534

2444

2111

try:

2445

2112

os.setgid(gid)

2446

2113

os.setuid(uid)

2447

2114

except OSError as error:

2448

if error.errno != errno.EPERM:

2115

if error[0] != errno.EPERM:

2449

2116

raise error

2450

2117

2451

2118

if debug:

2463

2130

.gnutls_global_set_log_function(debug_gnutls))

2464

2131

2465

2132

# Redirect stdin so all checkers get /dev/null

2466

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

2133

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

2467

2134

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

2468

2135

if null > 2:

2469

2136

os.close(null)

2137

else:

2138

# No console logging

2139

logger.removeHandler(console)

2470

2140

2471

2141

# Need to fork before connecting to D-Bus

2472

if not foreground:

2142

if not debug:

2473

2143

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

2474

2144

daemon()

2475

2145

2476

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

2477

# need to inform gobject that threads will be used.

2478

gobject.threads_init()

2479

2480

2146

global main_loop

2481

2147

# From the Avahi example code

2482

DBusGMainLoop(set_as_default=True)

2148

DBusGMainLoop(set_as_default=True )

2483

2149

main_loop = gobject.MainLoop()

2484

2150

bus = dbus.SystemBus()

2485

2151

# End of Avahi example code

2491

2157

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

2492

2158

do_not_queue=True))

2493

2159

except dbus.exceptions.NameExistsException as e:

2494

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

2160

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

2495

2161

use_dbus = False

2496

2162

server_settings["use_dbus"] = False

2497

2163

tcp_server.use_dbus = False

2509

2175

2510

2176

client_class = Client

2511

2177

if use_dbus:

2512

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

2513

2514

client_settings = Client.config_parser(client_config)

2178

client_class = functools.partial(ClientDBusTransitional,

2179

bus = bus)

2180

2181

special_settings = {

2182

# Some settings need to be accessd by special methods;

2183

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

2184

"approved_by_default":

2185

lambda section:

2186

client_config.getboolean(section, "approved_by_default"),

2187

"enabled":

2188

lambda section:

2189

client_config.getboolean(section, "enabled"),

2190

}

2191

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

2192

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

2193

# with exceptions for any special settings as defined above

2194

client_settings = dict((clientname,

2195

dict((setting,

2196

(value

2197

if setting not in special_settings

2198

else special_settings[setting]

2199

(clientname)))

2200

for setting, value in

2201

client_config.items(clientname)))

2202

for clientname in client_config.sections())

2203

2515

2204

old_client_settings = {}

2516

clients_data = {}

2205

clients_data = []

2517

2206

2518

2207

# Get client data and settings from last running state.

2519

2208

if server_settings["restore"]:

2523

2212

(stored_state))

2524

2213

os.remove(stored_state_path)

2525

2214

except IOError as e:

2526

if e.errno == errno.ENOENT:

2527

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

2528

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

2529

else:

2530

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

2531

exc_info=e)

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2532

2218

raise

2533

except EOFError as e:

2534

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

2535

"EOFError:", exc_info=e)

2536

2219

2537

with PGPEngine() as pgp:

2538

for client_name, client in clients_data.iteritems():

2220

with Crypto() as crypt:

2221

for client in clients_data:

2222

client_name = client["name"]

2223

2539

2224

# Decide which value to use after restoring saved state.

2540

2225

# We have three different values: Old config file,

2541

2226

# new config file, and saved state.

2549

2234

if (name != "secret" and

2550

2235

value != old_client_settings[client_name]

2551

2236

[name]):

2552

client[name] = value

2237

setattr(client, name, value)

2553

2238

except KeyError:

2554

2239

pass

2555

2240

2556

2241

# Clients who has passed its expire date can still be

2557

# enabled if its last checker was successful. Clients

2558

# whose checker succeeded before we stored its state is

2559

# assumed to have successfully run all checkers during

2560

# downtime.

2561

if client["enabled"]:

2562

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

2563

if not client["last_checked_ok"]:

2564

logger.warning(

2565

"disabling client {0} - Client never "

2566

"performed a successful checker"

2567

.format(client_name))

2568

client["enabled"] = False

2569

elif client["last_checker_status"] != 0:

2570

logger.warning(

2571

"disabling client {0} - Client "

2572

"last checker failed with error code {1}"

2573

.format(client_name,

2574

client["last_checker_status"]))

2242

# enabled if its last checker was sucessful. Clients

2243

# whose checker failed before we stored its state is

2244

# assumed to have failed all checkers during downtime.

2245

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

2246

if ((datetime.datetime.utcnow()

2247

- client["last_checked_ok"])

2248

> client["interval"]):

2249

if client["last_checker_status"] != 0:

2575

2250

client["enabled"] = False

2576

2251

else:

2577

2252

client["expires"] = (datetime.datetime

2578

2253

.utcnow()

2579

2254

+ client["timeout"])

2580

logger.debug("Last checker succeeded,"

2581

" keeping {0} enabled"

2582

.format(client_name))

2255

2256

client["changedstate"] = (multiprocessing_manager

2257

.Condition

2258

(multiprocessing_manager

2259

.Lock()))

2260

if use_dbus:

2261

new_client = (ClientDBusTransitional.__new__

2262

(ClientDBusTransitional))

2263

tcp_server.clients[client_name] = new_client

2264

new_client.bus = bus

2265

for name, value in client.iteritems():

2266

setattr(new_client, name, value)

2267

client_object_name = unicode(client_name).translate(

2268

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

2269

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

2270

new_client.dbus_object_path = (dbus.ObjectPath

2271

("/clients/"

2272

+ client_object_name))

2273

DBusObjectWithProperties.__init__(new_client,

2274

new_client.bus,

2275

new_client

2276

.dbus_object_path)

2277

else:

2278

tcp_server.clients[client_name] = (Client.__new__

2279

(Client))

2280

for name, value in client.iteritems():

2281

setattr(tcp_server.clients[client_name],

2282

name, value)

2283

2583

2284

try:

2584

client["secret"] = (

2585

pgp.decrypt(client["encrypted_secret"],

2586

client_settings[client_name]

2587

["secret"]))

2588

except PGPError:

2285

tcp_server.clients[client_name].secret = (

2286

crypt.decrypt(tcp_server.clients[client_name]

2287

.encrypted_secret,

2288

client_settings[client_name]

2289

["secret"]))

2290

except CryptoError:

2589

2291

# If decryption fails, we use secret from new settings

2590

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

2591

.format(client_name))

2592

client["secret"] = (

2292

tcp_server.clients[client_name].secret = (

2593

2293

client_settings[client_name]["secret"])

2594

2294

2595

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

2596

for client_name in (set(old_client_settings)

2597

- set(client_settings)):

2598

del clients_data[client_name]

2599

for client_name in (set(client_settings)

2600

- set(old_client_settings)):

2601

clients_data[client_name] = client_settings[client_name]

2602

2603

# Create all client objects

2604

for client_name, client in clients_data.iteritems():

2605

tcp_server.clients[client_name] = client_class(

2606

name = client_name, settings = client)

2295

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

2296

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

2297

del tcp_server.clients[clientname]

2298

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

2299

tcp_server.clients[clientname] = (client_class(name

2300

= clientname,

2301

config =

2302

client_settings

2303

[clientname]))

2607

2304

2608

2305

if not tcp_server.clients:

2609

2306

logger.warning("No clients defined")

2610

2611

if not foreground:

2612

if pidfile is not None:

2613

try:

2614

with pidfile:

2615

pid = os.getpid()

2616

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

2617

except IOError:

2618

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

2619

pidfilename, pid)

2620

del pidfile

2307

2308

if not debug:

2309

try:

2310

with pidfile:

2311

pid = os.getpid()

2312

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

2313

del pidfile

2314

except IOError:

2315

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

2316

pidfilename, pid)

2317

except NameError:

2318

# "pidfile" was never created

2319

pass

2621

2320

del pidfilename

2321

2322

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

2622

2323

2623

2324

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

2624

2325

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

2625

2326

2626

2327

if use_dbus:

2627

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

2628

"se.bsnet.fukt.Mandos"})

2629

class MandosDBusService(DBusObjectWithProperties):

2328

class MandosDBusService(dbus.service.Object):

2630

2329

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

2631

2330

def __init__(self):

2632

2331

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

2633

2332

_interface = "se.recompile.Mandos"

2634

2333

2635

@dbus_interface_annotations(_interface)

2636

def _foo(self):

2637

return { "org.freedesktop.DBus.Property"

2638

".EmitsChangedSignal":

2639

"false"}

2640

2641

2334

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

2642

2335

def ClientAdded(self, objpath):

2643

2336

"D-Bus signal"

2685

2378

2686

2379

del _interface

2687

2380

2688

mandos_dbus_service = MandosDBusService()

2381

class MandosDBusServiceTransitional(MandosDBusService):

2382

__metaclass__ = AlternateDBusNamesMetaclass

2383

mandos_dbus_service = MandosDBusServiceTransitional()

2689

2384

2690

2385

def cleanup():

2691

2386

"Cleanup function; run on exit"

2698

2393

# Store client before exiting. Secrets are encrypted with key

2699

2394

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

2700

2395

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

2701

clients = {}

2702

with PGPEngine() as pgp:

2396

clients = []

2397

with Crypto() as crypt:

2703

2398

for client in tcp_server.clients.itervalues():

2704

2399

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

2705

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

2706

key)

2400

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

2401

key)

2707

2402

client_dict = {}

2708

2403

2709

# A list of attributes that can not be pickled

2710

# + secret.

2711

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

2712

"checker"))

2404

# A list of attributes that will not be stored when

2405

# shutting down.

2406

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

2713

2407

for name, typ in (inspect.getmembers

2714

2408

(dbus.service.Object)):

2715

2409

exclude.add(name)

2720

2414

if attr not in exclude:

2721

2415

client_dict[attr] = getattr(client, attr)

2722

2416

2723

clients[client.name] = client_dict

2417

clients.append(client_dict)

2724

2418

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

2725

2419

2726

2420

try:

2727

with (tempfile.NamedTemporaryFile

2728

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

2729

dir=os.path.dirname(stored_state_path),

2730

delete=False)) as stored_state:

2421

with os.fdopen(os.open(stored_state_path,

2422

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

2423

0600), "wb") as stored_state:

2731

2424

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

2732

tempname=stored_state.name

2733

os.rename(tempname, stored_state_path)

2734

2425

except (IOError, OSError) as e:

2735

if not debug:

2736

try:

2737

os.remove(tempname)

2738

except NameError:

2739

pass

2740

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

2741

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

2742

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

2743

else:

2744

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

2745

exc_info=e)

2746

raise e

2426

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

2427

.format(e))

2428

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

2429

raise

2747

2430

2748

2431

# Delete all clients, and settings from config

2749

2432

while tcp_server.clients:

2776

2459

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

2777

2460

if use_ipv6:

2778

2461

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

2779

" flowinfo %d, scope_id %d",

2780

*tcp_server.socket.getsockname())

2462

" flowinfo %d, scope_id %d"

2463

% tcp_server.socket.getsockname())

2781

2464

else: # IPv4

2782

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

2783

*tcp_server.socket.getsockname())

2465

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

2466

% tcp_server.socket.getsockname())

2784

2467

2785

2468

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

2786

2469

2789

2472

try:

2790

2473

service.activate()

2791

2474

except dbus.exceptions.DBusException as error:

2792

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

2475

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

2793

2476

cleanup()

2794

2477

sys.exit(1)

2795

2478

# End of Avahi example code

2802

2485

logger.debug("Starting main loop")

2803

2486

main_loop.run()

2804

2487

except AvahiError as error:

2805

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

2488

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

2806

2489

cleanup()

2807

2490

sys.exit(1)

2808

2491

except KeyboardInterrupt:

2813

2496

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

2814

2497

cleanup()

2815

2498

2499

2816

2500

if __name__ == '__main__':

2817

2501

main()