/mandos/release : revision 237.7.159

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import cPickle as pickle

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import multiprocessing

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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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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.3.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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version = "1.6.0"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = str("/dev/log")))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(name)s [%(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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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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(ctypes.util.find_library("c"))

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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"Get an interface index the hard way, i.e. using fcntl()"

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SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

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with contextlib.closing(socket.socket()) as s:

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(str("16s16x"),

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interface))

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interface_index = struct.unpack(str("I"),

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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

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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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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(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.tempdir = tempfile.mkdtemp(prefix="mandos-")

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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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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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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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for root, dirs, files in os.walk(self.tempdir,

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topdown = False):

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for filename in files:

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os.remove(os.path.join(root, filename))

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for dirname in dirs:

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os.rmdir(os.path.join(root, dirname))

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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# Passphrase can not be empty and can not contain newlines or

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# NUL bytes. So we prefix it and hex encode it.

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return b"mandos" + binascii.hexlify(password)

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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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try:

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

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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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f.write(data)

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

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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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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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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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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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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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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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.GetAlternativeServiceName(self.name))

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logger.info("Changing Zeroconf service name to %r ...",

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self .entry_group_state_changed))

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'StateChanged', self.entry_group_state_changed))

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logger.debug("Adding Zeroconf service '%s' of type '%s' ...",

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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

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.format(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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dbus.exceptions.DBusException):

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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(self.server.GetState())

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def _timedelta_to_milliseconds(td):

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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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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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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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instance %(name)s can be used in the command.

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checker_initiator_tag: a gobject event source tag, or None

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created: datetime.datetime(); (UTC) object creation

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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disable_hook: If set, called by disable() as disable_hook(self)

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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fingerprint: string (40 or 32 hexadecimal digits); used to

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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_enabled: datetime.datetime(); (UTC)

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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

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

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"last_approval_request", "last_checked_ok",

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.timeout)

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return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.extended_timeout)

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return timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.interval)

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return timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return _timedelta_to_milliseconds(self.approval_delay)

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

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

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

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attribute."""

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

483

"""

484

settings = {}

485

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")

493

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

494

"enabled")

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

497

.replace(" ", ""))

498

if "secret" in section:

499

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

500

elif "secfile" in section:

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

502

(section["secfile"])),

503

"rb") as secfile:

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

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else:

506

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

507

.format(section))

508

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

509

client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

511

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"]

517

client["last_approval_request"] = None

518

client["last_checked_ok"] = None

519

client["last_checker_status"] = -2

520

521

return settings

522

523

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

338

524

self.name = name

339

if config is None:

340

config = {}

525

# adding all client settings

526

for setting, value in settings.iteritems():

527

setattr(self, setting, value)

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529

if self.enabled:

530

if not hasattr(self, "last_enabled"):

531

self.last_enabled = datetime.datetime.utcnow()

532

if not hasattr(self, "expires"):

533

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

534

+ self.timeout)

535

else:

536

self.last_enabled = None

537

self.expires = None

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539

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

342

540

# Uppercase and remove spaces from fingerprint for later

343

541

# comparison purposes with return value from the fingerprint()

344

542

# function

345

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

346

.replace(" ", ""))

347

543

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

348

if "secret" in config:

349

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

350

elif "secfile" in config:

351

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

352

(config["secfile"])),

353

"rb") as secfile:

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self.secret = secfile.read()

355

else:

356

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

357

% self.name)

358

self.host = config.get("host", "")

359

self.created = datetime.datetime.utcnow()

360

self.enabled = False

361

self.last_approval_request = None

362

self.last_enabled = None

363

self.last_checked_ok = None

364

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

365

self.extended_timeout = string_to_delta(config

366

["extended_timeout"])

367

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

368

self.disable_hook = disable_hook

544

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

545

datetime.datetime.utcnow())

546

547

# attributes specific for this server instance

369

548

self.checker = None

370

549

self.checker_initiator_tag = None

371

550

self.disable_initiator_tag = None

372

self.expires = None

373

551

self.checker_callback_tag = None

374

self.checker_command = config["checker"]

375

552

self.current_checker_command = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

553

self.approved = None

380

554

self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

384

config["approval_duration"])

385

555

self.changedstate = (multiprocessing_manager

386

556

.Condition(multiprocessing_manager

387

557

.Lock()))

558

self.client_structure = [attr for attr in

559

self.__dict__.iterkeys()

560

if not attr.startswith("_")]

561

self.client_structure.append("client_structure")

562

563

for name, t in inspect.getmembers(type(self),

564

lambda obj:

565

isinstance(obj,

566

property)):

567

if not name.startswith("_"):

568

self.client_structure.append(name)

388

569

570

# Send notice to process children that client state has changed

389

571

def send_changedstate(self):

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

572

with self.changedstate:

573

self.changedstate.notify_all()

393

574

394

575

def enable(self):

395

576

"""Start this client's checker and timeout hooks"""

396

577

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

397

578

# Already enabled

398

579

return

580

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

581

self.enabled = True

582

self.last_enabled = datetime.datetime.utcnow()

583

self.init_checker()

399

584

self.send_changedstate()

585

586

def disable(self, quiet=True):

587

"""Disable this client."""

588

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

589

return False

590

if not quiet:

591

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

592

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

593

gobject.source_remove(self.disable_initiator_tag)

594

self.disable_initiator_tag = None

595

self.expires = None

596

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

597

gobject.source_remove(self.checker_initiator_tag)

598

self.checker_initiator_tag = None

599

self.stop_checker()

600

self.enabled = False

601

if not quiet:

602

self.send_changedstate()

603

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

604

return False

605

606

def __del__(self):

607

self.disable()

608

609

def init_checker(self):

400

610

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

401

611

# and every interval from then on.

612

if self.checker_initiator_tag is not None:

613

gobject.source_remove(self.checker_initiator_tag)

402

614

self.checker_initiator_tag = (gobject.timeout_add

403

615

(self.interval_milliseconds(),

404

616

self.start_checker))

405

617

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

406

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

618

if self.disable_initiator_tag is not None:

619

gobject.source_remove(self.disable_initiator_tag)

407

620

self.disable_initiator_tag = (gobject.timeout_add

408

621

(self.timeout_milliseconds(),

409

622

self.disable))

410

self.enabled = True

411

self.last_enabled = datetime.datetime.utcnow()

412

623

# Also start a new checker *right now*.

413

624

self.start_checker()

414

625

415

def disable(self, quiet=True):

416

"""Disable this client."""

417

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

418

return False

419

if not quiet:

420

self.send_changedstate()

421

if not quiet:

422

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

423

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

424

gobject.source_remove(self.disable_initiator_tag)

425

self.disable_initiator_tag = None

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self.expires = None

427

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

428

gobject.source_remove(self.checker_initiator_tag)

429

self.checker_initiator_tag = None

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

433

self.enabled = False

434

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

435

return False

436

437

def __del__(self):

438

self.disable_hook = None

439

self.disable()

440

441

626

def checker_callback(self, pid, condition, command):

442

627

"""The checker has completed, so take appropriate actions."""

443

628

self.checker_callback_tag = None

444

629

self.checker = None

445

630

if os.WIFEXITED(condition):

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

631

self.last_checker_status = os.WEXITSTATUS(condition)

632

if self.last_checker_status == 0:

448

633

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

449

634

vars(self))

450

635

self.checked_ok()

452

637

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

453

638

vars(self))

454

639

else:

640

self.last_checker_status = -1

455

641

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

456

642

vars(self))

457

643

458

def checked_ok(self, timeout=None):

459

"""Bump up the timeout for this client.

460

461

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

462

alive and well.

463

"""

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."""

464

652

if timeout is None:

465

653

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

467

gobject.source_remove(self.disable_initiator_tag)

468

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

469

self.disable_initiator_tag = (gobject.timeout_add

470

(_timedelta_to_milliseconds

471

(timeout), self.disable))

654

if self.disable_initiator_tag is not None:

655

gobject.source_remove(self.disable_initiator_tag)

656

self.disable_initiator_tag = None

657

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

658

self.disable_initiator_tag = (gobject.timeout_add

659

(timedelta_to_milliseconds

660

(timeout), self.disable))

661

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

472

662

473

663

def need_approval(self):

474

664

self.last_approval_request = datetime.datetime.utcnow()

479

669

If a checker already exists, leave it running and do

480

670

nothing."""

481

671

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

482

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

483

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

484

# client would inevitably timeout, since no checker would get

485

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

672

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

673

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

674

# would inevitably timeout, since no checker would get a

675

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

486

676

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

487

677

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

488

678

# should be.

502

692

self.current_checker_command)

503

693

# Start a new checker if needed

504

694

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)

505

700

try:

506

# In case checker_command has exactly one % operator

507

command = self.checker_command % self.host

508

except TypeError:

509

# Escape attributes for the shell

510

escaped_attrs = dict(

511

(attr,

512

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

513

errors=

514

'replace')))

515

for attr in

516

self.runtime_expansions)

517

518

try:

519

command = self.checker_command % escaped_attrs

520

except TypeError as error:

521

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

522

' %s', self.checker_command, error)

523

return True # Try again later

701

command = self.checker_command % escaped_attrs

702

except TypeError as error:

703

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

704

self.checker_command, exc_info=error)

705

return True # Try again later

524

706

self.current_checker_command = command

525

707

try:

526

708

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

532

714

self.checker = subprocess.Popen(command,

533

715

close_fds=True,

534

716

shell=True, cwd="/")

535

self.checker_callback_tag = (gobject.child_watch_add

536

(self.checker.pid,

537

self.checker_callback,

538

data=command))

539

# The checker may have completed before the gobject

540

# watch was added. Check for this.

717

except OSError as error:

718

logger.error("Failed to start subprocess",

719

exc_info=error)

720

return True

721

self.checker_callback_tag = (gobject.child_watch_add

722

(self.checker.pid,

723

self.checker_callback,

724

data=command))

725

# The checker may have completed before the gobject

726

# watch was added. Check for this.

727

try:

541

728

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

542

if pid:

543

gobject.source_remove(self.checker_callback_tag)

544

self.checker_callback(pid, status, command)

545

729

except OSError as error:

546

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

547

error)

730

if error.errno == errno.ECHILD:

731

# This should never happen

732

logger.error("Child process vanished",

733

exc_info=error)

734

return True

735

raise

736

if pid:

737

gobject.source_remove(self.checker_callback_tag)

738

self.checker_callback(pid, status, command)

548

739

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

549

740

return True

550

741

557

748

return

558

749

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

559

750

try:

560

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

751

self.checker.terminate()

561

752

#time.sleep(0.5)

562

753

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

563

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

754

# self.checker.kill()

564

755

except OSError as error:

565

756

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

566

757

raise

583

774

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

584

775

if byte_arrays and signature != "ay":

585

776

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

586

" signature %r" % signature)

777

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

587

778

def decorator(func):

588

779

func._dbus_is_property = True

589

780

func._dbus_interface = dbus_interface

597

788

return decorator

598

789

599

790

791

def dbus_interface_annotations(dbus_interface):

792

"""Decorator for marking functions returning interface annotations

793

794

Usage:

795

796

@dbus_interface_annotations("org.example.Interface")

797

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

798

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

799

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

800

"false"}

801

"""

802

def decorator(func):

803

func._dbus_is_interface = True

804

func._dbus_interface = dbus_interface

805

func._dbus_name = dbus_interface

806

return func

807

return decorator

808

809

810

def dbus_annotations(annotations):

811

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

812

Usage:

813

814

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

815

access="r")

816

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

817

"org.freedesktop.DBus.Property."

818

"EmitsChangedSignal": "false"})

819

def Property_dbus_property(self):

820

return dbus.Boolean(False)

821

"""

822

def decorator(func):

823

func._dbus_annotations = annotations

824

return func

825

return decorator

826

827

600

828

class DBusPropertyException(dbus.exceptions.DBusException):

601

829

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

602

830

"""

625

853

"""

626

854

627

855

@staticmethod

628

def _is_dbus_property(obj):

629

return getattr(obj, "_dbus_is_property", False)

856

def _is_dbus_thing(thing):

857

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

858

859

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

860

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

861

"""

862

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

863

False)

630

864

631

def _get_all_dbus_properties(self):

865

def _get_all_dbus_things(self, thing):

632

866

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

633

867

"""

634

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

868

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

869

name),

870

athing.__get__(self))

635

871

for cls in self.__class__.__mro__

636

for name, prop in

637

inspect.getmembers(cls, self._is_dbus_property))

872

for name, athing in

873

inspect.getmembers(cls,

874

self._is_dbus_thing(thing)))

638

875

639

876

def _get_dbus_property(self, interface_name, property_name):

640

877

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

642

879

"""

643

880

for cls in self.__class__.__mro__:

644

881

for name, value in (inspect.getmembers

645

(cls, self._is_dbus_property)):

882

(cls,

883

self._is_dbus_thing("property"))):

646

884

if (value._dbus_name == property_name

647

885

and value._dbus_interface == interface_name):

648

886

return value.__get__(self)

677

915

# signatures other than "ay".

678

916

if prop._dbus_signature != "ay":

679

917

raise ValueError

680

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

681

for byte in value))

918

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

919

for byte in value))

682

920

prop(value)

683

921

684

922

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

689

927

690

928

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

691

929

"""

692

all = {}

693

for name, prop in self._get_all_dbus_properties():

930

properties = {}

931

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

694

932

if (interface_name

695

933

and interface_name != prop._dbus_interface):

696

934

# Interface non-empty but did not match

700

938

continue

701

939

value = prop()

702

940

if not hasattr(value, "variant_level"):

703

all[name] = value

941

properties[name] = value

704

942

continue

705

all[name] = type(value)(value, variant_level=

706

value.variant_level+1)

707

return dbus.Dictionary(all, signature="sv")

943

properties[name] = type(value)(value, variant_level=

944

value.variant_level+1)

945

return dbus.Dictionary(properties, signature="sv")

708

946

709

947

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

710

948

out_signature="s",

711

949

path_keyword='object_path',

712

950

connection_keyword='connection')

713

951

def Introspect(self, object_path, connection):

714

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

952

"""Overloading of standard D-Bus method.

953

954

Inserts property tags and interface annotation tags.

715

955

"""

716

956

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

717

957

connection)

724

964

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

725

965

return e

726

966

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

967

# Add property tags

727

968

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

728

969

for name, prop

729

in self._get_all_dbus_properties()

970

in self._get_all_dbus_things("property")

730

971

if prop._dbus_interface

731

972

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

732

973

if_tag.appendChild(tag)

974

# Add annotation tags

975

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

976

for tag in if_tag.getElementsByTagName(typ):

977

annots = dict()

978

for name, prop in (self.

979

_get_all_dbus_things(typ)):

980

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

981

and prop._dbus_interface

982

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

983

annots.update(getattr

984

(prop,

985

"_dbus_annotations",

986

{}))

987

for name, value in annots.iteritems():

988

ann_tag = document.createElement(

989

"annotation")

990

ann_tag.setAttribute("name", name)

991

ann_tag.setAttribute("value", value)

992

tag.appendChild(ann_tag)

993

# Add interface annotation tags

994

for annotation, value in dict(

995

itertools.chain.from_iterable(

996

annotations().iteritems()

997

for name, annotations in

998

self._get_all_dbus_things("interface")

999

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

1000

)).iteritems():

1001

ann_tag = document.createElement("annotation")

1002

ann_tag.setAttribute("name", annotation)

1003

ann_tag.setAttribute("value", value)

1004

if_tag.appendChild(ann_tag)

733

1005

# Add the names to the return values for the

734

1006

# "org.freedesktop.DBus.Properties" methods

735

1007

if (if_tag.getAttribute("name")

750

1022

except (AttributeError, xml.dom.DOMException,

751

1023

xml.parsers.expat.ExpatError) as error:

752

1024

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

753

error)

1025

exc_info=error)

754

1026

return xmlstring

755

1027

756

1028

757

def datetime_to_dbus (dt, variant_level=0):

1029

def datetime_to_dbus(dt, variant_level=0):

758

1030

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

759

1031

if dt is None:

760

1032

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

761

1033

return dbus.String(dt.isoformat(),

762

1034

variant_level=variant_level)

763

1035

764

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

765

.__metaclass__):

766

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

767

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

1036

1037

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1038

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

1039

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

1040

interface names according to the "alt_interface_names" mapping.

1041

Usage:

1042

1043

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

1044

"net.example.AlternateInterface"})

1045

class SampleDBusObject(dbus.service.Object):

1046

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

1047

def SampleDBusMethod():

1048

pass

1049

1050

The above "SampleDBusMethod" on "SampleDBusObject" will be

1051

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

1052

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

1053

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

1054

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

1055

1056

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

1057

(from DBusObjectWithProperties) and interfaces (from the

1058

dbus_interface_annotations decorator).

768

1059

"""

769

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

770

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

771

# methods, signals, or properties in them

772

for base in (b for b in bases

773

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

774

# Go though all attributes of the base class

775

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

1060

def wrapper(cls):

1061

for orig_interface_name, alt_interface_name in (

1062

alt_interface_names.iteritems()):

1063

attr = {}

1064

interface_names = set()

1065

# Go though all attributes of the class

1066

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

776

1067

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

777

1068

# with the wrong interface name

778

1069

if (not hasattr(attribute, "_dbus_interface")

779

1070

or not attribute._dbus_interface

780

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

1071

.startswith(orig_interface_name)):

781

1072

continue

782

1073

# Create an alternate D-Bus interface name based on

783

1074

# the current name

784

1075

alt_interface = (attribute._dbus_interface

785

.replace("se.recompile.Mandos",

786

"se.bsnet.fukt.Mandos"))

1076

.replace(orig_interface_name,

1077

alt_interface_name))

1078

interface_names.add(alt_interface)

787

1079

# Is this a D-Bus signal?

788

1080

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

789

1081

# Extract the original non-method function by

804

1096

nonmethod_func.func_name,

805

1097

nonmethod_func.func_defaults,

806

1098

nonmethod_func.func_closure)))

1099

# Copy annotations, if any

1100

try:

1101

new_function._dbus_annotations = (

1102

dict(attribute._dbus_annotations))

1103

except AttributeError:

1104

pass

807

1105

# Define a creator of a function to call both the

808

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

809

# signals gets sent when the function is called

1106

# original and alternate functions, so both the

1107

# original and alternate signals gets sent when

1108

# the function is called

810

1109

def fixscope(func1, func2):

811

1110

"""This function is a scope container to pass

812

1111

func1 and func2 to the "call_both" function

819

1118

return call_both

820

1119

# Create the "call_both" function and add it to

821

1120

# the class

822

attr[attrname] = fixscope(attribute,

823

new_function)

1121

attr[attrname] = fixscope(attribute, new_function)

824

1122

# Is this a D-Bus method?

825

1123

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

826

1124

# Create a new, but exactly alike, function

837

1135

attribute.func_name,

838

1136

attribute.func_defaults,

839

1137

attribute.func_closure)))

1138

# Copy annotations, if any

1139

try:

1140

attr[attrname]._dbus_annotations = (

1141

dict(attribute._dbus_annotations))

1142

except AttributeError:

1143

pass

840

1144

# Is this a D-Bus property?

841

1145

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

842

1146

# Create a new, but exactly alike, function

856

1160

attribute.func_name,

857

1161

attribute.func_defaults,

858

1162

attribute.func_closure)))

859

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

860

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1169

# Is this a D-Bus interface?

1170

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

1171

# Create a new, but exactly alike, function

1172

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

1173

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

1174

# to the class.

1175

attr[attrname] = (dbus_interface_annotations

1176

(alt_interface)

1177

(types.FunctionType

1178

(attribute.func_code,

1179

attribute.func_globals,

1180

attribute.func_name,

1181

attribute.func_defaults,

1182

attribute.func_closure)))

1183

if deprecate:

1184

# Deprecate all alternate interfaces

1185

iname="_AlternateDBusNames_interface_annotation{0}"

1186

for interface_name in interface_names:

1187

@dbus_interface_annotations(interface_name)

1188

def func(self):

1189

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

1190

"true" }

1191

# Find an unused name

1192

for aname in (iname.format(i)

1193

for i in itertools.count()):

1194

if aname not in attr:

1195

attr[aname] = func

1196

break

1197

if interface_names:

1198

# Replace the class with a new subclass of it with

1199

# methods, signals, etc. as created above.

1200

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

1201

(cls,), attr)

1202

return cls

1203

return wrapper

1204

1205

1206

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

1207

"se.bsnet.fukt.Mandos"})

861

1208

class ClientDBus(Client, DBusObjectWithProperties):

862

1209

"""A Client class using D-Bus

863

1210

872

1219

# dbus.service.Object doesn't use super(), so we can't either.

873

1220

874

1221

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

875

self._approvals_pending = 0

876

1222

self.bus = bus

877

1223

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

878

1224

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

884

1230

("/clients/" + client_object_name))

885

1231

DBusObjectWithProperties.__init__(self, self.bus,

886

1232

self.dbus_object_path)

887

1233

888

1234

def notifychangeproperty(transform_func,

889

1235

dbus_name, type_func=lambda x: x,

890

1236

variant_level=1):

891

1237

""" Modify a variable so that it's a property which announces

892

1238

its changes to DBus.

893

894

transform_fun: Function that takes a value and transforms it

895

to a D-Bus type.

1239

1240

transform_fun: Function that takes a value and a variant_level

1241

and transforms it to a D-Bus type.

896

1242

dbus_name: D-Bus name of the variable

897

1243

type_func: Function that transform the value before sending it

898

1244

to the D-Bus. Default: no transform

905

1251

type_func(getattr(self, attrname, None))

906

1252

!= type_func(value)):

907

1253

dbus_value = transform_func(type_func(value),

908

variant_level)

1254

variant_level

1255

=variant_level)

909

1256

self.PropertyChanged(dbus.String(dbus_name),

910

1257

dbus_value)

911

1258

setattr(self, attrname, value)

912

1259

913

1260

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

914

1261

915

916

1262

expires = notifychangeproperty(datetime_to_dbus, "Expires")

917

1263

approvals_pending = notifychangeproperty(dbus.Boolean,

918

1264

"ApprovalPending",

925

1271

checker is not None)

926

1272

last_checked_ok = notifychangeproperty(datetime_to_dbus,

927

1273

"LastCheckedOK")

1274

last_checker_status = notifychangeproperty(dbus.Int16,

1275

"LastCheckerStatus")

928

1276

last_approval_request = notifychangeproperty(

929

1277

datetime_to_dbus, "LastApprovalRequest")

930

1278

approved_by_default = notifychangeproperty(dbus.Boolean,

931

1279

"ApprovedByDefault")

932

approval_delay = notifychangeproperty(dbus.UInt16,

1280

approval_delay = notifychangeproperty(dbus.UInt64,

933

1281

"ApprovalDelay",

934

1282

type_func =

935

_timedelta_to_milliseconds)

1283

timedelta_to_milliseconds)

936

1284

approval_duration = notifychangeproperty(

937

dbus.UInt16, "ApprovalDuration",

938

type_func = _timedelta_to_milliseconds)

1285

dbus.UInt64, "ApprovalDuration",

1286

type_func = timedelta_to_milliseconds)

939

1287

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

940

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

1288

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

941

1289

type_func =

942

_timedelta_to_milliseconds)

1290

timedelta_to_milliseconds)

943

1291

extended_timeout = notifychangeproperty(

944

dbus.UInt16, "ExtendedTimeout",

945

type_func = _timedelta_to_milliseconds)

946

interval = notifychangeproperty(dbus.UInt16,

1292

dbus.UInt64, "ExtendedTimeout",

1293

type_func = timedelta_to_milliseconds)

1294

interval = notifychangeproperty(dbus.UInt64,

947

1295

"Interval",

948

1296

type_func =

949

_timedelta_to_milliseconds)

1297

timedelta_to_milliseconds)

950

1298

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

951

1299

952

1300

del notifychangeproperty

994

1342

return r

995

1343

996

1344

def _reset_approved(self):

997

self._approved = None

1345

self.approved = None

998

1346

return False

999

1347

1000

1348

def approve(self, value=True):

1001

self.send_changedstate()

1002

self._approved = value

1003

gobject.timeout_add(_timedelta_to_milliseconds

1349

self.approved = value

1350

gobject.timeout_add(timedelta_to_milliseconds

1004

1351

(self.approval_duration),

1005

1352

self._reset_approved)

1006

1353

self.send_changedstate()

1007

1354

1008

1355

## D-Bus methods, signals & properties

1009

1356

_interface = "se.recompile.Mandos.Client"

1010

1357

1358

## Interfaces

1359

1360

@dbus_interface_annotations(_interface)

1361

def _foo(self):

1362

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

1363

"false"}

1364

1011

1365

## Signals

1012

1366

1013

1367

# CheckerCompleted - signal

1112

1466

access="readwrite")

1113

1467

def ApprovalDuration_dbus_property(self, value=None):

1114

1468

if value is None: # get

1115

return dbus.UInt64(_timedelta_to_milliseconds(

1469

return dbus.UInt64(timedelta_to_milliseconds(

1116

1470

self.approval_duration))

1117

1471

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

1118

1472

1132

1486

def Host_dbus_property(self, value=None):

1133

1487

if value is None: # get

1134

1488

return dbus.String(self.host)

1135

self.host = value

1489

self.host = unicode(value)

1136

1490

1137

1491

# Created - property

1138

1492

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

1139

1493

def Created_dbus_property(self):

1140

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

1494

return datetime_to_dbus(self.created)

1141

1495

1142

1496

# LastEnabled - property

1143

1497

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

1164

1518

return

1165

1519

return datetime_to_dbus(self.last_checked_ok)

1166

1520

1521

# LastCheckerStatus - property

1522

@dbus_service_property(_interface, signature="n",

1523

access="read")

1524

def LastCheckerStatus_dbus_property(self):

1525

return dbus.Int16(self.last_checker_status)

1526

1167

1527

# Expires - property

1168

1528

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

1169

1529

def Expires_dbus_property(self):

1180

1540

def Timeout_dbus_property(self, value=None):

1181

1541

if value is None: # get

1182

1542

return dbus.UInt64(self.timeout_milliseconds())

1543

old_timeout = self.timeout

1183

1544

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

1184

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

1185

return

1186

# Reschedule timeout

1187

gobject.source_remove(self.disable_initiator_tag)

1188

self.disable_initiator_tag = None

1189

self.expires = None

1190

time_to_die = (self.

1191

_timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow()))

1196

if time_to_die <= 0:

1197

# The timeout has passed

1198

self.disable()

1199

else:

1200

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

1201

+ datetime.timedelta(milliseconds =

1202

time_to_die))

1203

self.disable_initiator_tag = (gobject.timeout_add

1204

(time_to_die, self.disable))

1545

# Reschedule disabling

1546

if self.enabled:

1547

now = datetime.datetime.utcnow()

1548

self.expires += self.timeout - old_timeout

1549

if self.expires <= now:

1550

# The timeout has passed

1551

self.disable()

1552

else:

1553

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

1554

is None):

1555

return

1556

gobject.source_remove(self.disable_initiator_tag)

1557

self.disable_initiator_tag = (

1558

gobject.timeout_add(

1559

timedelta_to_milliseconds(self.expires - now),

1560

self.disable))

1205

1561

1206

1562

# ExtendedTimeout - property

1207

1563

@dbus_service_property(_interface, signature="t",

1220

1576

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

1221

1577

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

1222

1578

return

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

1579

if self.enabled:

1580

# Reschedule checker run

1581

gobject.source_remove(self.checker_initiator_tag)

1582

self.checker_initiator_tag = (gobject.timeout_add

1583

(value, self.start_checker))

1584

self.start_checker() # Start one now, too

1228

1585

1229

1586

# Checker - property

1230

1587

@dbus_service_property(_interface, signature="s",

1232

1589

def Checker_dbus_property(self, value=None):

1233

1590

if value is None: # get

1234

1591

return dbus.String(self.checker_command)

1235

self.checker_command = value

1592

self.checker_command = unicode(value)

1236

1593

1237

1594

# CheckerRunning - property

1238

1595

@dbus_service_property(_interface, signature="b",

1267

1624

raise KeyError()

1268

1625

1269

1626

def __getattribute__(self, name):

1270

if(name == '_pipe'):

1627

if name == '_pipe':

1271

1628

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

1272

1629

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

1273

1630

data = self._pipe.recv()

1280

1637

return func

1281

1638

1282

1639

def __setattr__(self, name, value):

1283

if(name == '_pipe'):

1640

if name == '_pipe':

1284

1641

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

1285

1642

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

1286

1643

1287

class ClientDBusTransitional(ClientDBus):

1288

__metaclass__ = AlternateDBusNamesMetaclass

1289

1644

1290

1645

class ClientHandler(socketserver.BaseRequestHandler, object):

1291

1646

"""A class to handle client connections.

1374

1729

client.Rejected("Disabled")

1375

1730

return

1376

1731

1377

if client._approved or not client.approval_delay:

1732

if client.approved or not client.approval_delay:

1378

1733

#We are approved or approval is disabled

1379

1734

break

1380

elif client._approved is None:

1735

elif client.approved is None:

1381

1736

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

1382

1737

client.name)

1383

1738

if self.server.use_dbus:

1394

1749

return

1395

1750

1396

1751

#wait until timeout or approved

1397

#x = float(client

1398

# ._timedelta_to_milliseconds(delay))

1399

1752

time = datetime.datetime.now()

1400

1753

client.changedstate.acquire()

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1754

client.changedstate.wait(

1755

float(timedelta_to_milliseconds(delay)

1756

/ 1000))

1404

1757

client.changedstate.release()

1405

1758

time2 = datetime.datetime.now()

1406

1759

if (time2 - time) >= delay:

1422

1775

try:

1423

1776

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

1424

1777

except gnutls.errors.GNUTLSError as error:

1425

logger.warning("gnutls send failed")

1778

logger.warning("gnutls send failed",

1779

exc_info=error)

1426

1780

return

1427

1781

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

1428

1782

sent, len(client.secret)

1430

1784

sent_size += sent

1431

1785

1432

1786

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

1433

# bump the timeout as if seen

1434

client.checked_ok(client.extended_timeout)

1787

# bump the timeout using extended_timeout

1788

client.bump_timeout(client.extended_timeout)

1435

1789

if self.server.use_dbus:

1436

1790

# Emit D-Bus signal

1437

1791

client.GotSecret()

1442

1796

try:

1443

1797

session.bye()

1444

1798

except gnutls.errors.GNUTLSError as error:

1445

logger.warning("GnuTLS bye failed")

1799

logger.warning("GnuTLS bye failed",

1800

exc_info=error)

1446

1801

1447

1802

@staticmethod

1448

1803

def peer_certificate(session):

1504

1859

# Convert the buffer to a Python bytestring

1505

1860

fpr = ctypes.string_at(buf, buf_len.value)

1506

1861

# Convert the bytestring to hexadecimal notation

1507

hex_fpr = ''.join("%02X" % ord(char) for char in fpr)

1862

hex_fpr = binascii.hexlify(fpr).upper()

1508

1863

return hex_fpr

1509

1864

1510

1865

1513

1868

def sub_process_main(self, request, address):

1514

1869

try:

1515

1870

self.finish_request(request, address)

1516

except:

1871

except Exception:

1517

1872

self.handle_error(request, address)

1518

1873

self.close_request(request)

1519

1874

1520

1875

def process_request(self, request, address):

1521

1876

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

1522

multiprocessing.Process(target = self.sub_process_main,

1523

args = (request, address)).start()

1877

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

1878

args = (request, address))

1879

proc.start()

1880

return proc

1524

1881

1525

1882

1526

1883

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1532

1889

"""

1533

1890

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1534

1891

1535

super(MultiprocessingMixInWithPipe,

1536

self).process_request(request, client_address)

1892

proc = MultiprocessingMixIn.process_request(self, request,

1893

client_address)

1537

1894

self.child_pipe.close()

1538

self.add_pipe(parent_pipe)

1895

self.add_pipe(parent_pipe, proc)

1539

1896

1540

def add_pipe(self, parent_pipe):

1897

def add_pipe(self, parent_pipe, proc):

1541

1898

"""Dummy function; override as necessary"""

1542

1899

raise NotImplementedError

1543

1900

1552

1909

use_ipv6: Boolean; to use IPv6 or not

1553

1910

"""

1554

1911

def __init__(self, server_address, RequestHandlerClass,

1555

interface=None, use_ipv6=True):

1912

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

1913

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

1914

creating a new one with socket.socket().

1915

"""

1556

1916

self.interface = interface

1557

1917

if use_ipv6:

1558

1918

self.address_family = socket.AF_INET6

1919

if socketfd is not None:

1920

# Save the file descriptor

1921

self.socketfd = socketfd

1922

# Save the original socket.socket() function

1923

self.socket_socket = socket.socket

1924

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

1925

#

1926

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

1927

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

1928

# patching socket.socket.)

1929

#

1930

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

1931

@functools.wraps(socket.socket)

1932

def socket_wrapper(*args, **kwargs):

1933

# Restore original function so subsequent calls are

1934

# not affected.

1935

socket.socket = self.socket_socket

1936

del self.socket_socket

1937

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

1938

# saved file descriptor.

1939

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

1940

# Replace socket.socket() function with wrapper

1941

socket.socket = socket_wrapper

1942

# The socketserver.TCPServer.__init__ will call

1943

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

1944

# socket_wrapper(), if socketfd was set.

1559

1945

socketserver.TCPServer.__init__(self, server_address,

1560

1946

RequestHandlerClass)

1947

1561

1948

def server_bind(self):

1562

1949

"""This overrides the normal server_bind() function

1563

1950

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

1571

1958

try:

1572

1959

self.socket.setsockopt(socket.SOL_SOCKET,

1573

1960

SO_BINDTODEVICE,

1574

str(self.interface

1575

+ '\0'))

1961

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

1576

1962

except socket.error as error:

1577

if error[0] == errno.EPERM:

1578

logger.error("No permission to"

1579

" bind to interface %s",

1580

self.interface)

1581

elif error[0] == errno.ENOPROTOOPT:

1963

if error.errno == errno.EPERM:

1964

logger.error("No permission to bind to"

1965

" interface %s", self.interface)

1966

elif error.errno == errno.ENOPROTOOPT:

1582

1967

logger.error("SO_BINDTODEVICE not available;"

1583

1968

" cannot bind to interface %s",

1584

1969

self.interface)

1970

elif error.errno == errno.ENODEV:

1971

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

1972

" cannot bind", self.interface)

1585

1973

else:

1586

1974

raise

1587

1975

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

1617

2005

"""

1618

2006

def __init__(self, server_address, RequestHandlerClass,

1619

2007

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

1620

gnutls_priority=None, use_dbus=True):

2008

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

1621

2009

self.enabled = False

1622

2010

self.clients = clients

1623

2011

if self.clients is None:

1624

self.clients = set()

2012

self.clients = {}

1625

2013

self.use_dbus = use_dbus

1626

2014

self.gnutls_priority = gnutls_priority

1627

2015

IPv6_TCPServer.__init__(self, server_address,

1628

2016

RequestHandlerClass,

1629

2017

interface = interface,

1630

use_ipv6 = use_ipv6)

2018

use_ipv6 = use_ipv6,

2019

socketfd = socketfd)

1631

2020

def server_activate(self):

1632

2021

if self.enabled:

1633

2022

return socketserver.TCPServer.server_activate(self)

2023

1634

2024

def enable(self):

1635

2025

self.enabled = True

1636

def add_pipe(self, parent_pipe):

2026

2027

def add_pipe(self, parent_pipe, proc):

1637

2028

# Call "handle_ipc" for both data and EOF events

1638

2029

gobject.io_add_watch(parent_pipe.fileno(),

1639

2030

gobject.IO_IN | gobject.IO_HUP,

1640

2031

functools.partial(self.handle_ipc,

1641

2032

parent_pipe =

1642

parent_pipe))

1643

2033

parent_pipe,

2034

proc = proc))

2035

1644

2036

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

1645

client_object=None):

1646

condition_names = {

1647

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

1648

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

1649

# blocking).

1650

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

1651

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

1652

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

1653

# broken, usually for pipes and

1654

# sockets).

1655

}

1656

conditions_string = ' | '.join(name

1657

for cond, name in

1658

condition_names.iteritems()

1659

if cond & condition)

1660

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

1661

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

2037

proc = None, client_object=None):

2038

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

2039

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

2040

# Wait for other process to exit

2041

proc.join()

1662

2042

return False

1663

2043

1664

2044

# Read a request from the child

1669

2049

fpr = request[1]

1670

2050

address = request[2]

1671

2051

1672

for c in self.clients:

2052

for c in self.clients.itervalues():

1673

2053

if c.fingerprint == fpr:

1674

2054

client = c

1675

2055

break

1688

2068

functools.partial(self.handle_ipc,

1689

2069

parent_pipe =

1690

2070

parent_pipe,

2071

proc = proc,

1691

2072

client_object =

1692

2073

client))

1693

2074

parent_pipe.send(True)

1719

2100

return True

1720

2101

1721

2102

2103

def rfc3339_duration_to_delta(duration):

2104

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

2105

2106

>>> rfc3339_duration_to_delta("P7D")

2107

datetime.timedelta(7)

2108

>>> rfc3339_duration_to_delta("PT60S")

2109

datetime.timedelta(0, 60)

2110

>>> rfc3339_duration_to_delta("PT60M")

2111

datetime.timedelta(0, 3600)

2112

>>> rfc3339_duration_to_delta("PT24H")

2113

datetime.timedelta(1)

2114

>>> rfc3339_duration_to_delta("P1W")

2115

datetime.timedelta(7)

2116

>>> rfc3339_duration_to_delta("PT5M30S")

2117

datetime.timedelta(0, 330)

2118

>>> rfc3339_duration_to_delta("P1DT3M20S")

2119

datetime.timedelta(1, 200)

2120

"""

2121

2122

# Parsing an RFC 3339 duration with regular expressions is not

2123

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

2124

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

2125

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

2126

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

2127

# avoid excessive use of external libraries.

2128

2129

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

2130

Token = collections.namedtuple("Token",

2131

("regexp", # To match token; if

2132

# "value" is not None,

2133

# must have a "group"

2134

# containing digits

2135

"value", # datetime.timedelta or

2136

# None

2137

"followers")) # Tokens valid after

2138

# this token

2139

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

2140

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

2141

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

2142

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

2143

datetime.timedelta(seconds=1),

2144

frozenset((token_end,)))

2145

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

2146

datetime.timedelta(minutes=1),

2147

frozenset((token_second, token_end)))

2148

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

2149

datetime.timedelta(hours=1),

2150

frozenset((token_minute, token_end)))

2151

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

2152

None,

2153

frozenset((token_hour, token_minute,

2154

token_second)))

2155

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

2156

datetime.timedelta(days=1),

2157

frozenset((token_time, token_end)))

2158

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

2159

datetime.timedelta(weeks=4),

2160

frozenset((token_day, token_end)))

2161

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

2162

datetime.timedelta(weeks=52),

2163

frozenset((token_month, token_end)))

2164

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

2165

datetime.timedelta(weeks=1),

2166

frozenset((token_end,)))

2167

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

2168

frozenset((token_year, token_month,

2169

token_day, token_time,

2170

token_week))),

2171

# Define starting values

2172

value = datetime.timedelta() # Value so far

2173

found_token = None

2174

followers = frozenset(token_duration,) # Following valid tokens

2175

s = duration # String left to parse

2176

# Loop until end token is found

2177

while found_token is not token_end:

2178

# Search for any currently valid tokens

2179

for token in followers:

2180

match = token.regexp.match(s)

2181

if match is not None:

2182

# Token found

2183

if token.value is not None:

2184

# Value found, parse digits

2185

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

2186

# Add to value so far

2187

value += factor * token.value

2188

# Strip token from string

2189

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

2190

# Go to found token

2191

found_token = token

2192

# Set valid next tokens

2193

followers = found_token.followers

2194

break

2195

else:

2196

# No currently valid tokens were found

2197

raise ValueError("Invalid RFC 3339 duration")

2198

# End token found

2199

return value

2200

2201

1722

2202

def string_to_delta(interval):

1723

2203

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

1724

2204

1735

2215

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

1736

2216

datetime.timedelta(0, 330)

1737

2217

"""

2218

2219

try:

2220

return rfc3339_duration_to_delta(interval)

2221

except ValueError:

2222

pass

2223

1738

2224

timevalue = datetime.timedelta(0)

1739

2225

for s in interval.split():

1740

2226

try:

1751

2237

elif suffix == "w":

1752

2238

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

1753

2239

else:

1754

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

2240

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

2241

.format(suffix))

1755

2242

except (ValueError, IndexError) as e:

1756

2243

raise ValueError(*(e.args))

1757

2244

timevalue += delta

1758

2245

return timevalue

1759

2246

1760

2247

1761

def if_nametoindex(interface):

1762

"""Call the C function if_nametoindex(), or equivalent

1763

1764

Note: This function cannot accept a unicode string."""

1765

global if_nametoindex

1766

try:

1767

if_nametoindex = (ctypes.cdll.LoadLibrary

1768

(ctypes.util.find_library("c"))

1769

.if_nametoindex)

1770

except (OSError, AttributeError):

1771

logger.warning("Doing if_nametoindex the hard way")

1772

def if_nametoindex(interface):

1773

"Get an interface index the hard way, i.e. using fcntl()"

1774

SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

1775

with contextlib.closing(socket.socket()) as s:

1776

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1777

struct.pack(str("16s16x"),

1778

interface))

1779

interface_index = struct.unpack(str("I"),

1780

ifreq[16:20])[0]

1781

return interface_index

1782

return if_nametoindex(interface)

1783

1784

1785

2248

def daemon(nochdir = False, noclose = False):

1786

2249

"""See daemon(3). Standard BSD Unix function.

1787

2250

1795

2258

sys.exit()

1796

2259

if not noclose:

1797

2260

# Close all standard open file descriptors

1798

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

2261

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

1799

2262

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

1800

2263

raise OSError(errno.ENODEV,

1801

"%s not a character device"

1802

% os.path.devnull)

2264

"{0} not a character device"

2265

.format(os.devnull))

1803

2266

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

1804

2267

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

1805

2268

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

1814

2277

1815

2278

parser = argparse.ArgumentParser()

1816

2279

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

1817

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

2280

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

1818

2281

help="show version number and exit")

1819

2282

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

1820

2283

help="Bind to interface IF")

1842

2305

" system bus interface")

1843

2306

parser.add_argument("--no-ipv6", action="store_false",

1844

2307

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

2308

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

2309

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

2310

" state")

2311

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

2312

help="Specify a file descriptor to a network"

2313

" socket to use instead of creating one")

2314

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

2315

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

2316

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

2317

help="Run in foreground")

2318

1845

2319

options = parser.parse_args()

1846

2320

1847

2321

if options.check:

1860

2334

"use_dbus": "True",

1861

2335

"use_ipv6": "True",

1862

2336

"debuglevel": "",

2337

"restore": "True",

2338

"socket": "",

2339

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

2340

"foreground": "False",

1863

2341

}

1864

2342

1865

2343

# Parse config file for server-global settings

1870

2348

# Convert the SafeConfigParser object to a dict

1871

2349

server_settings = server_config.defaults()

1872

2350

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

1873

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

2351

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

1874

2352

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

1875

2353

option)

1876

2354

if server_settings["port"]:

1877

2355

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

1878

2356

"port")

2357

if server_settings["socket"]:

2358

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

2359

"socket")

2360

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

2361

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

2362

# happen with a supplied network socket.

2363

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

2364

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

2365

["socket"])

1879

2366

del server_config

1880

2367

1881

2368

# Override the settings from the config file with command line

1882

2369

# options, if set.

1883

2370

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

1884

2371

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

1885

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

2372

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

2373

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

1886

2374

value = getattr(options, option)

1887

2375

if value is not None:

1888

2376

server_settings[option] = value

1891

2379

for option in server_settings.keys():

1892

2380

if type(server_settings[option]) is str:

1893

2381

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

2382

# Debug implies foreground

2383

if server_settings["debug"]:

2384

server_settings["foreground"] = True

1894

2385

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

1895

2386

1896

2387

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

1900

2391

debuglevel = server_settings["debuglevel"]

1901

2392

use_dbus = server_settings["use_dbus"]

1902

2393

use_ipv6 = server_settings["use_ipv6"]

2394

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

2395

stored_state_file)

2396

foreground = server_settings["foreground"]

2397

2398

if debug:

2399

initlogger(debug, logging.DEBUG)

2400

else:

2401

if not debuglevel:

2402

initlogger(debug)

2403

else:

2404

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

2405

initlogger(debug, level)

1903

2406

1904

2407

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

1905

2408

syslogger.setFormatter(logging.Formatter

1906

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

1907

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

1908

% server_settings["servicename"]))

2409

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

2410

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

2411

.format(server_settings

2412

["servicename"])))

1909

2413

1910

2414

# Parse config file with clients

1911

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

1912

"extended_timeout": "15m",

1913

"interval": "2m",

1914

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

1915

"host": "",

1916

"approval_delay": "0s",

1917

"approval_duration": "1s",

1918

}

1919

client_config = configparser.SafeConfigParser(client_defaults)

2415

client_config = configparser.SafeConfigParser(Client

2416

.client_defaults)

1920

2417

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

1921

2418

"clients.conf"))

1922

2419

1931

2428

use_ipv6=use_ipv6,

1932

2429

gnutls_priority=

1933

2430

server_settings["priority"],

1934

use_dbus=use_dbus)

1935

if not debug:

2431

use_dbus=use_dbus,

2432

socketfd=(server_settings["socket"]

2433

or None))

2434

if not foreground:

1936

2435

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

2436

pidfile = None

1937

2437

try:

1938

2438

pidfile = open(pidfilename, "w")

1939

except IOError:

1940

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

2439

except IOError as e:

2440

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

2441

exc_info=e)

1941

2442

1942

try:

1943

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

1944

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

1945

except KeyError:

2443

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

1946

2444

try:

1947

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

1948

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

2445

uid = pwd.getpwnam(name).pw_uid

2446

gid = pwd.getpwnam(name).pw_gid

2447

break

1949

2448

except KeyError:

1950

try:

1951

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

1952

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

1953

except KeyError:

1954

uid = 65534

1955

gid = 65534

2449

continue

2450

else:

2451

uid = 65534

2452

gid = 65534

1956

2453

try:

1957

2454

os.setgid(gid)

1958

2455

os.setuid(uid)

1959

2456

except OSError as error:

1960

if error[0] != errno.EPERM:

2457

if error.errno != errno.EPERM:

1961

2458

raise error

1962

2459

1963

if not debug and not debuglevel:

1964

syslogger.setLevel(logging.WARNING)

1965

console.setLevel(logging.WARNING)

1966

if debuglevel:

1967

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

1968

syslogger.setLevel(level)

1969

console.setLevel(level)

1970

1971

2460

if debug:

1972

2461

# Enable all possible GnuTLS debugging

1973

2462

1983

2472

.gnutls_global_set_log_function(debug_gnutls))

1984

2473

1985

2474

# Redirect stdin so all checkers get /dev/null

1986

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

2475

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

1987

2476

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

1988

2477

if null > 2:

1989

2478

os.close(null)

1990

else:

1991

# No console logging

1992

logger.removeHandler(console)

1993

2479

1994

2480

# Need to fork before connecting to D-Bus

1995

if not debug:

2481

if not foreground:

1996

2482

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

1997

2483

daemon()

1998

2484

2485

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

2486

# need to inform gobject that threads will be used.

2487

gobject.threads_init()

2488

1999

2489

global main_loop

2000

2490

# From the Avahi example code

2001

DBusGMainLoop(set_as_default=True )

2491

DBusGMainLoop(set_as_default=True)

2002

2492

main_loop = gobject.MainLoop()

2003

2493

bus = dbus.SystemBus()

2004

2494

# End of Avahi example code

2010

2500

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

2011

2501

do_not_queue=True))

2012

2502

except dbus.exceptions.NameExistsException as e:

2013

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

2503

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

2014

2504

use_dbus = False

2015

2505

server_settings["use_dbus"] = False

2016

2506

tcp_server.use_dbus = False

2017

2507

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2018

service = AvahiService(name = server_settings["servicename"],

2019

servicetype = "_mandos._tcp",

2020

protocol = protocol, bus = bus)

2508

service = AvahiServiceToSyslog(name =

2509

server_settings["servicename"],

2510

servicetype = "_mandos._tcp",

2511

protocol = protocol, bus = bus)

2021

2512

if server_settings["interface"]:

2022

2513

service.interface = (if_nametoindex

2023

2514

(str(server_settings["interface"])))

2027

2518

2028

2519

client_class = Client

2029

2520

if use_dbus:

2030

client_class = functools.partial(ClientDBusTransitional,

2031

bus = bus)

2032

def client_config_items(config, section):

2033

special_settings = {

2034

"approved_by_default":

2035

lambda: config.getboolean(section,

2036

"approved_by_default"),

2037

}

2038

for name, value in config.items(section):

2521

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

2522

2523

client_settings = Client.config_parser(client_config)

2524

old_client_settings = {}

2525

clients_data = {}

2526

2527

# Get client data and settings from last running state.

2528

if server_settings["restore"]:

2529

try:

2530

with open(stored_state_path, "rb") as stored_state:

2531

clients_data, old_client_settings = (pickle.load

2532

(stored_state))

2533

os.remove(stored_state_path)

2534

except IOError as e:

2535

if e.errno == errno.ENOENT:

2536

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

2537

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

2538

else:

2539

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

2540

exc_info=e)

2541

raise

2542

except EOFError as e:

2543

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

2544

"EOFError:", exc_info=e)

2545

2546

with PGPEngine() as pgp:

2547

for client_name, client in clients_data.iteritems():

2548

# Decide which value to use after restoring saved state.

2549

# We have three different values: Old config file,

2550

# new config file, and saved state.

2551

# New config value takes precedence if it differs from old

2552

# config value, otherwise use saved state.

2553

for name, value in client_settings[client_name].items():

2554

try:

2555

# For each value in new config, check if it

2556

# differs from the old config value (Except for

2557

# the "secret" attribute)

2558

if (name != "secret" and

2559

value != old_client_settings[client_name]

2560

[name]):

2561

client[name] = value

2562

except KeyError:

2563

pass

2564

2565

# Clients who has passed its expire date can still be

2566

# enabled if its last checker was successful. Clients

2567

# whose checker succeeded before we stored its state is

2568

# assumed to have successfully run all checkers during

2569

# downtime.

2570

if client["enabled"]:

2571

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

2572

if not client["last_checked_ok"]:

2573

logger.warning(

2574

"disabling client {0} - Client never "

2575

"performed a successful checker"

2576

.format(client_name))

2577

client["enabled"] = False

2578

elif client["last_checker_status"] != 0:

2579

logger.warning(

2580

"disabling client {0} - Client "

2581

"last checker failed with error code {1}"

2582

.format(client_name,

2583

client["last_checker_status"]))

2584

client["enabled"] = False

2585

else:

2586

client["expires"] = (datetime.datetime

2587

.utcnow()

2588

+ client["timeout"])

2589

logger.debug("Last checker succeeded,"

2590

" keeping {0} enabled"

2591

.format(client_name))

2039

2592

try:

2040

yield (name, special_settings[name]())

2041

except KeyError:

2042

yield (name, value)

2043

2044

tcp_server.clients.update(set(

2045

client_class(name = section,

2046

config= dict(client_config_items(

2047

client_config, section)))

2048

for section in client_config.sections()))

2593

client["secret"] = (

2594

pgp.decrypt(client["encrypted_secret"],

2595

client_settings[client_name]

2596

["secret"]))

2597

except PGPError:

2598

# If decryption fails, we use secret from new settings

2599

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

2600

.format(client_name))

2601

client["secret"] = (

2602

client_settings[client_name]["secret"])

2603

2604

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

2605

for client_name in (set(old_client_settings)

2606

- set(client_settings)):

2607

del clients_data[client_name]

2608

for client_name in (set(client_settings)

2609

- set(old_client_settings)):

2610

clients_data[client_name] = client_settings[client_name]

2611

2612

# Create all client objects

2613

for client_name, client in clients_data.iteritems():

2614

tcp_server.clients[client_name] = client_class(

2615

name = client_name, settings = client)

2616

2049

2617

if not tcp_server.clients:

2050

2618

logger.warning("No clients defined")

2051

2052

if not debug:

2053

try:

2054

with pidfile:

2055

pid = os.getpid()

2056

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

2057

del pidfile

2058

except IOError:

2059

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

2060

pidfilename, pid)

2061

except NameError:

2062

# "pidfile" was never created

2063

pass

2619

2620

if not foreground:

2621

if pidfile is not None:

2622

try:

2623

with pidfile:

2624

pid = os.getpid()

2625

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

2626

except IOError:

2627

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

2628

pidfilename, pid)

2629

del pidfile

2064

2630

del pidfilename

2065

2066

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

2067

2631

2068

2632

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

2069

2633

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

2070

2634

2071

2635

if use_dbus:

2072

class MandosDBusService(dbus.service.Object):

2636

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

2637

"se.bsnet.fukt.Mandos"})

2638

class MandosDBusService(DBusObjectWithProperties):

2073

2639

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

2074

2640

def __init__(self):

2075

2641

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

2076

2642

_interface = "se.recompile.Mandos"

2077

2643

2644

@dbus_interface_annotations(_interface)

2645

def _foo(self):

2646

return { "org.freedesktop.DBus.Property"

2647

".EmitsChangedSignal":

2648

"false"}

2649

2078

2650

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

2079

2651

def ClientAdded(self, objpath):

2080

2652

"D-Bus signal"

2094

2666

def GetAllClients(self):

2095

2667

"D-Bus method"

2096

2668

return dbus.Array(c.dbus_object_path

2097

for c in tcp_server.clients)

2669

for c in

2670

tcp_server.clients.itervalues())

2098

2671

2099

2672

@dbus.service.method(_interface,

2100

2673

out_signature="a{oa{sv}}")

2102

2675

"D-Bus method"

2103

2676

return dbus.Dictionary(

2104

2677

((c.dbus_object_path, c.GetAll(""))

2105

for c in tcp_server.clients),

2678

for c in tcp_server.clients.itervalues()),

2106

2679

signature="oa{sv}")

2107

2680

2108

2681

@dbus.service.method(_interface, in_signature="o")

2109

2682

def RemoveClient(self, object_path):

2110

2683

"D-Bus method"

2111

for c in tcp_server.clients:

2684

for c in tcp_server.clients.itervalues():

2112

2685

if c.dbus_object_path == object_path:

2113

tcp_server.clients.remove(c)

2686

del tcp_server.clients[c.name]

2114

2687

c.remove_from_connection()

2115

2688

# Don't signal anything except ClientRemoved

2116

2689

c.disable(quiet=True)

2121

2694

2122

2695

del _interface

2123

2696

2124

class MandosDBusServiceTransitional(MandosDBusService):

2125

__metaclass__ = AlternateDBusNamesMetaclass

2126

mandos_dbus_service = MandosDBusServiceTransitional()

2697

mandos_dbus_service = MandosDBusService()

2127

2698

2128

2699

def cleanup():

2129

2700

"Cleanup function; run on exit"

2130

2701

service.cleanup()

2131

2702

2703

multiprocessing.active_children()

2704

if not (tcp_server.clients or client_settings):

2705

return

2706

2707

# Store client before exiting. Secrets are encrypted with key

2708

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

2709

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

2710

clients = {}

2711

with PGPEngine() as pgp:

2712

for client in tcp_server.clients.itervalues():

2713

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

2714

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

2715

key)

2716

client_dict = {}

2717

2718

# A list of attributes that can not be pickled

2719

# + secret.

2720

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

2721

"checker"))

2722

for name, typ in (inspect.getmembers

2723

(dbus.service.Object)):

2724

exclude.add(name)

2725

2726

client_dict["encrypted_secret"] = (client

2727

.encrypted_secret)

2728

for attr in client.client_structure:

2729

if attr not in exclude:

2730

client_dict[attr] = getattr(client, attr)

2731

2732

clients[client.name] = client_dict

2733

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

2734

2735

try:

2736

with (tempfile.NamedTemporaryFile

2737

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

2738

dir=os.path.dirname(stored_state_path),

2739

delete=False)) as stored_state:

2740

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

2741

tempname=stored_state.name

2742

os.rename(tempname, stored_state_path)

2743

except (IOError, OSError) as e:

2744

if not debug:

2745

try:

2746

os.remove(tempname)

2747

except NameError:

2748

pass

2749

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

2750

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

2751

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

2752

else:

2753

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

2754

exc_info=e)

2755

raise e

2756

2757

# Delete all clients, and settings from config

2132

2758

while tcp_server.clients:

2133

client = tcp_server.clients.pop()

2759

name, client = tcp_server.clients.popitem()

2134

2760

if use_dbus:

2135

2761

client.remove_from_connection()

2136

client.disable_hook = None

2137

2762

# Don't signal anything except ClientRemoved

2138

2763

client.disable(quiet=True)

2139

2764

if use_dbus:

2141

2766

mandos_dbus_service.ClientRemoved(client

2142

2767

.dbus_object_path,

2143

2768

client.name)

2769

client_settings.clear()

2144

2770

2145

2771

atexit.register(cleanup)

2146

2772

2147

for client in tcp_server.clients:

2773

for client in tcp_server.clients.itervalues():

2148

2774

if use_dbus:

2149

2775

# Emit D-Bus signal

2150

2776

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2151

client.enable()

2777

# Need to initiate checking of clients

2778

if client.enabled:

2779

client.init_checker()

2152

2780

2153

2781

tcp_server.enable()

2154

2782

tcp_server.server_activate()

2157

2785

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

2158

2786

if use_ipv6:

2159

2787

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

2160

" flowinfo %d, scope_id %d"

2161

% tcp_server.socket.getsockname())

2788

" flowinfo %d, scope_id %d",

2789

*tcp_server.socket.getsockname())

2162

2790

else: # IPv4

2163

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

2164

% tcp_server.socket.getsockname())

2791

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

2792

*tcp_server.socket.getsockname())

2165

2793

2166

2794

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

2167

2795

2170

2798

try:

2171

2799

service.activate()

2172

2800

except dbus.exceptions.DBusException as error:

2173

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

2801

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

2174

2802

cleanup()

2175

2803

sys.exit(1)

2176

2804

# End of Avahi example code

2183

2811

logger.debug("Starting main loop")

2184

2812

main_loop.run()

2185

2813

except AvahiError as error:

2186

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

2814

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

2187

2815

cleanup()

2188

2816

sys.exit(1)

2189

2817

except KeyboardInterrupt:

2194

2822

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

2195

2823

cleanup()

2196

2824

2197

2198

2825

if __name__ == '__main__':

2199

2826

main()