/mandos/trunk : revision 505.1.4

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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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except ImportError:

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SO_BINDTODEVICE = None

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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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version = "1.3.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--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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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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proc = subprocess.Popen(['gpg', '--symmetric',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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ciphertext, err = proc.communicate(input = data)

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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proc = subprocess.Popen(['gpg', '--decrypt',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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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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class AvahiError(Exception):

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

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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type: string; Example: '_mandos._tcp'.

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See <https://www.iana.org/assignments/service-names-port-numbers>

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See <http://www.dns-sd.org/ServiceTypes.html>

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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domain: string; Domain to publish on, default to .local if empty.

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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("D-Bus Exception", exc_info=error)

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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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: {0!s}"

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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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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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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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_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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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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return _timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return _timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return _timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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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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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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if config is None:

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config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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if "secret" in config:

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

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elif "secfile" in config:

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

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(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

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

359

self.created = datetime.datetime.utcnow()

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self.enabled = False

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self.last_approval_request = None

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self.last_enabled = None

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self.last_checked_ok = None

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

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self.extended_timeout = string_to_delta(config

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["extended_timeout"])

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

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self.disable_hook = disable_hook

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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self.expires = None

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

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self.current_checker_command = None

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self.approved = None

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self.last_connect = None

377

self._approved = None

378

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

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True)

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self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

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config["approval_delay"])

383

self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

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.Condition(multiprocessing_manager

561

387

.Lock()))

562

self.client_structure = [attr for attr in

563

self.__dict__.iterkeys()

564

if not attr.startswith("_")]

565

self.client_structure.append("client_structure")

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

568

lambda obj:

569

isinstance(obj,

570

property)):

571

if not name.startswith("_"):

572

self.client_structure.append(name)

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# Send notice to process children that client state has changed

575

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def send_changedstate(self):

576

with self.changedstate:

577

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

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def enable(self):

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

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396

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

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# Already enabled

583

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return

399

self.send_changedstate()

400

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

401

# and every interval from then on.

402

self.checker_initiator_tag = (gobject.timeout_add

403

(self.interval_milliseconds(),

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self.start_checker))

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

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

407

self.disable_initiator_tag = (gobject.timeout_add

408

(self.timeout_milliseconds(),

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self.disable))

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

587

self.init_checker()

588

self.send_changedstate()

412

# Also start a new checker *right now*.

413

self.start_checker()

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def disable(self, quiet=True):

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"""Disable this client."""

592

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

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return False

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if not quiet:

420

self.send_changedstate()

421

if not quiet:

595

422

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

596

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

423

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

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

600

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

427

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

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = None

603

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

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self.enabled = False

605

if not quiet:

606

self.send_changedstate()

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

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return False

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610

437

def __del__(self):

438

self.disable_hook = None

611

439

self.disable()

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613

def init_checker(self):

614

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

615

# and every interval from then on.

616

if self.checker_initiator_tag is not None:

617

gobject.source_remove(self.checker_initiator_tag)

618

self.checker_initiator_tag = (gobject.timeout_add

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(self.interval_milliseconds(),

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self.start_checker))

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

622

if self.disable_initiator_tag is not None:

623

gobject.source_remove(self.disable_initiator_tag)

624

self.disable_initiator_tag = (gobject.timeout_add

625

(self.timeout_milliseconds(),

626

self.disable))

627

# Also start a new checker *right now*.

628

self.start_checker()

629

630

441

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

631

442

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

632

443

self.checker_callback_tag = None

633

444

self.checker = None

634

445

if os.WIFEXITED(condition):

635

self.last_checker_status = os.WEXITSTATUS(condition)

636

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

637

448

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

638

449

vars(self))

639

450

self.checked_ok()

641

452

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

642

453

vars(self))

643

454

else:

644

self.last_checker_status = -1

645

455

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

646

456

vars(self))

647

457

648

def checked_ok(self):

649

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

650

self.last_checked_ok = datetime.datetime.utcnow()

651

self.last_checker_status = 0

652

self.bump_timeout()

653

654

def bump_timeout(self, timeout=None):

655

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

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

"""

656

464

if timeout is None:

657

465

timeout = self.timeout

658

if self.disable_initiator_tag is not None:

659

gobject.source_remove(self.disable_initiator_tag)

660

self.disable_initiator_tag = None

661

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

662

self.disable_initiator_tag = (gobject.timeout_add

663

(timedelta_to_milliseconds

664

(timeout), self.disable))

665

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

666

472

667

473

def need_approval(self):

668

474

self.last_approval_request = datetime.datetime.utcnow()

673

479

If a checker already exists, leave it running and do

674

480

nothing."""

675

481

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

676

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

677

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

678

# would inevitably timeout, since no checker would get a

679

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

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

680

486

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

681

487

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

682

488

# should be.

696

502

self.current_checker_command)

697

503

# Start a new checker if needed

698

504

if self.checker is None:

699

# Escape attributes for the shell

700

escaped_attrs = dict(

701

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

702

for attr in

703

self.runtime_expansions)

704

505

try:

705

command = self.checker_command % escaped_attrs

706

except TypeError as error:

707

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

708

self.checker_command, exc_info=error)

709

return True # Try again later

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

710

524

self.current_checker_command = command

711

525

try:

712

526

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

715

529

# in normal mode, that is already done by daemon(),

716

530

# and in debug mode we don't want to. (Stdin is

717

531

# always replaced by /dev/null.)

718

# The exception is when not debugging but nevertheless

719

# running in the foreground; use the previously

720

# created wnull.

721

popen_args = {}

722

if (not self.server_settings["debug"]

723

and self.server_settings["foreground"]):

724

popen_args.update({"stdout": wnull,

725

"stderr": wnull })

726

532

self.checker = subprocess.Popen(command,

727

533

close_fds=True,

728

shell=True, cwd="/",

729

**popen_args)

730

except OSError as error:

731

logger.error("Failed to start subprocess",

732

exc_info=error)

733

return True

734

self.checker_callback_tag = (gobject.child_watch_add

735

(self.checker.pid,

736

self.checker_callback,

737

data=command))

738

# The checker may have completed before the gobject

739

# watch was added. Check for this.

740

try:

534

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.

741

541

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)

742

545

except OSError as error:

743

if error.errno == errno.ECHILD:

744

# This should never happen

745

logger.error("Child process vanished",

746

exc_info=error)

747

return True

748

raise

749

if pid:

750

gobject.source_remove(self.checker_callback_tag)

751

self.checker_callback(pid, status, command)

546

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

547

error)

752

548

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

753

549

return True

754

550

761

557

return

762

558

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

763

559

try:

764

self.checker.terminate()

560

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

765

561

#time.sleep(0.5)

766

562

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

767

# self.checker.kill()

563

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

768

564

except OSError as error:

769

565

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

770

566

raise

787

583

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

788

584

if byte_arrays and signature != "ay":

789

585

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

790

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

586

" signature %r" % signature)

791

587

def decorator(func):

792

588

func._dbus_is_property = True

793

589

func._dbus_interface = dbus_interface

801

597

return decorator

802

598

803

599

804

def dbus_interface_annotations(dbus_interface):

805

"""Decorator for marking functions returning interface annotations

806

807

Usage:

808

809

@dbus_interface_annotations("org.example.Interface")

810

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

811

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

812

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

813

"false"}

814

"""

815

def decorator(func):

816

func._dbus_is_interface = True

817

func._dbus_interface = dbus_interface

818

func._dbus_name = dbus_interface

819

return func

820

return decorator

821

822

823

def dbus_annotations(annotations):

824

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

825

Usage:

826

827

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

828

access="r")

829

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

830

"org.freedesktop.DBus.Property."

831

"EmitsChangedSignal": "false"})

832

def Property_dbus_property(self):

833

return dbus.Boolean(False)

834

"""

835

def decorator(func):

836

func._dbus_annotations = annotations

837

return func

838

return decorator

839

840

841

600

class DBusPropertyException(dbus.exceptions.DBusException):

842

601

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

843

602

"""

866

625

"""

867

626

868

627

@staticmethod

869

def _is_dbus_thing(thing):

870

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

871

872

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

873

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

874

"""

875

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

876

False)

628

def _is_dbus_property(obj):

629

return getattr(obj, "_dbus_is_property", False)

877

630

878

def _get_all_dbus_things(self, thing):

631

def _get_all_dbus_properties(self):

879

632

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

880

633

"""

881

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

882

name),

883

athing.__get__(self))

634

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

884

635

for cls in self.__class__.__mro__

885

for name, athing in

886

inspect.getmembers(cls,

887

self._is_dbus_thing(thing)))

636

for name, prop in

637

inspect.getmembers(cls, self._is_dbus_property))

888

638

889

639

def _get_dbus_property(self, interface_name, property_name):

890

640

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

892

642

"""

893

643

for cls in self.__class__.__mro__:

894

644

for name, value in (inspect.getmembers

895

(cls,

896

self._is_dbus_thing("property"))):

645

(cls, self._is_dbus_property)):

897

646

if (value._dbus_name == property_name

898

647

and value._dbus_interface == interface_name):

899

648

return value.__get__(self)

928

677

# signatures other than "ay".

929

678

if prop._dbus_signature != "ay":

930

679

raise ValueError

931

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

932

for byte in value))

680

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

681

for byte in value))

933

682

prop(value)

934

683

935

684

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

940

689

941

690

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

942

691

"""

943

properties = {}

944

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

692

all = {}

693

for name, prop in self._get_all_dbus_properties():

945

694

if (interface_name

946

695

and interface_name != prop._dbus_interface):

947

696

# Interface non-empty but did not match

951

700

continue

952

701

value = prop()

953

702

if not hasattr(value, "variant_level"):

954

properties[name] = value

703

all[name] = value

955

704

continue

956

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

957

value.variant_level+1)

958

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

705

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

706

value.variant_level+1)

707

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

959

708

960

709

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

961

710

out_signature="s",

962

711

path_keyword='object_path',

963

712

connection_keyword='connection')

964

713

def Introspect(self, object_path, connection):

965

"""Overloading of standard D-Bus method.

966

967

Inserts property tags and interface annotation tags.

714

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

968

715

"""

969

716

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

970

717

connection)

977

724

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

978

725

return e

979

726

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

980

# Add property tags

981

727

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

982

728

for name, prop

983

in self._get_all_dbus_things("property")

729

in self._get_all_dbus_properties()

984

730

if prop._dbus_interface

985

731

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

986

732

if_tag.appendChild(tag)

987

# Add annotation tags

988

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

989

for tag in if_tag.getElementsByTagName(typ):

990

annots = dict()

991

for name, prop in (self.

992

_get_all_dbus_things(typ)):

993

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

994

and prop._dbus_interface

995

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

996

annots.update(getattr

997

(prop,

998

"_dbus_annotations",

999

{}))

1000

for name, value in annots.iteritems():

1001

ann_tag = document.createElement(

1002

"annotation")

1003

ann_tag.setAttribute("name", name)

1004

ann_tag.setAttribute("value", value)

1005

tag.appendChild(ann_tag)

1006

# Add interface annotation tags

1007

for annotation, value in dict(

1008

itertools.chain.from_iterable(

1009

annotations().iteritems()

1010

for name, annotations in

1011

self._get_all_dbus_things("interface")

1012

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

1013

)).iteritems():

1014

ann_tag = document.createElement("annotation")

1015

ann_tag.setAttribute("name", annotation)

1016

ann_tag.setAttribute("value", value)

1017

if_tag.appendChild(ann_tag)

1018

733

# Add the names to the return values for the

1019

734

# "org.freedesktop.DBus.Properties" methods

1020

735

if (if_tag.getAttribute("name")

1035

750

except (AttributeError, xml.dom.DOMException,

1036

751

xml.parsers.expat.ExpatError) as error:

1037

752

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

1038

exc_info=error)

753

error)

1039

754

return xmlstring

1040

755

1041

756

1042

def datetime_to_dbus(dt, variant_level=0):

757

def datetime_to_dbus (dt, variant_level=0):

1043

758

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

1044

759

if dt is None:

1045

760

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

1046

761

return dbus.String(dt.isoformat(),

1047

762

variant_level=variant_level)

1048

763

1049

1050

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1051

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

1052

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

1053

interface names according to the "alt_interface_names" mapping.

1054

Usage:

1055

1056

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

1057

"net.example.AlternateInterface"})

1058

class SampleDBusObject(dbus.service.Object):

1059

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

1060

def SampleDBusMethod():

1061

pass

1062

1063

The above "SampleDBusMethod" on "SampleDBusObject" will be

1064

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

1065

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

1066

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

1067

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

1068

1069

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

1070

(from DBusObjectWithProperties) and interfaces (from the

1071

dbus_interface_annotations decorator).

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.

1072

768

"""

1073

def wrapper(cls):

1074

for orig_interface_name, alt_interface_name in (

1075

alt_interface_names.iteritems()):

1076

attr = {}

1077

interface_names = set()

1078

# Go though all attributes of the class

1079

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

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):

1080

776

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

1081

777

# with the wrong interface name

1082

778

if (not hasattr(attribute, "_dbus_interface")

1083

779

or not attribute._dbus_interface

1084

.startswith(orig_interface_name)):

780

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

1085

781

continue

1086

782

# Create an alternate D-Bus interface name based on

1087

783

# the current name

1088

784

alt_interface = (attribute._dbus_interface

1089

.replace(orig_interface_name,

1090

alt_interface_name))

1091

interface_names.add(alt_interface)

785

.replace("se.recompile.Mandos",

786

"se.bsnet.fukt.Mandos"))

1092

787

# Is this a D-Bus signal?

1093

788

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

1094

# Extract the original non-method undecorated

1095

# function by black magic

789

# Extract the original non-method function by

790

# black magic

1096

791

nonmethod_func = (dict(

1097

792

zip(attribute.func_code.co_freevars,

1098

793

attribute.__closure__))["func"]

1109

804

nonmethod_func.func_name,

1110

805

nonmethod_func.func_defaults,

1111

806

nonmethod_func.func_closure)))

1112

# Copy annotations, if any

1113

try:

1114

new_function._dbus_annotations = (

1115

dict(attribute._dbus_annotations))

1116

except AttributeError:

1117

pass

1118

807

# Define a creator of a function to call both the

1119

# original and alternate functions, so both the

1120

# original and alternate signals gets sent when

1121

# the function is called

808

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

809

# signals gets sent when the function is called

1122

810

def fixscope(func1, func2):

1123

811

"""This function is a scope container to pass

1124

812

func1 and func2 to the "call_both" function

1131

819

return call_both

1132

820

# Create the "call_both" function and add it to

1133

821

# the class

1134

attr[attrname] = fixscope(attribute, new_function)

822

attr[attrname] = fixscope(attribute,

823

new_function)

1135

824

# Is this a D-Bus method?

1136

825

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

1137

826

# Create a new, but exactly alike, function

1148

837

attribute.func_name,

1149

838

attribute.func_defaults,

1150

839

attribute.func_closure)))

1151

# Copy annotations, if any

1152

try:

1153

attr[attrname]._dbus_annotations = (

1154

dict(attribute._dbus_annotations))

1155

except AttributeError:

1156

pass

1157

840

# Is this a D-Bus property?

1158

841

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

1159

842

# Create a new, but exactly alike, function

1173

856

attribute.func_name,

1174

857

attribute.func_defaults,

1175

858

attribute.func_closure)))

1176

# Copy annotations, if any

1177

try:

1178

attr[attrname]._dbus_annotations = (

1179

dict(attribute._dbus_annotations))

1180

except AttributeError:

1181

pass

1182

# Is this a D-Bus interface?

1183

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

1184

# Create a new, but exactly alike, function

1185

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

1186

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

1187

# to the class.

1188

attr[attrname] = (dbus_interface_annotations

1189

(alt_interface)

1190

(types.FunctionType

1191

(attribute.func_code,

1192

attribute.func_globals,

1193

attribute.func_name,

1194

attribute.func_defaults,

1195

attribute.func_closure)))

1196

if deprecate:

1197

# Deprecate all alternate interfaces

1198

iname="_AlternateDBusNames_interface_annotation{0}"

1199

for interface_name in interface_names:

1200

@dbus_interface_annotations(interface_name)

1201

def func(self):

1202

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

1203

"true" }

1204

# Find an unused name

1205

for aname in (iname.format(i)

1206

for i in itertools.count()):

1207

if aname not in attr:

1208

attr[aname] = func

1209

break

1210

if interface_names:

1211

# Replace the class with a new subclass of it with

1212

# methods, signals, etc. as created above.

1213

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

1214

(cls,), attr)

1215

return cls

1216

return wrapper

1217

1218

1219

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

1220

"se.bsnet.fukt.Mandos"})

859

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

860

1221

861

class ClientDBus(Client, DBusObjectWithProperties):

1222

862

"""A Client class using D-Bus

1223

863

1232

872

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

1233

873

1234

874

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

875

self._approvals_pending = 0

1235

876

self.bus = bus

1236

877

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

1237

878

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

1243

884

("/clients/" + client_object_name))

1244

885

DBusObjectWithProperties.__init__(self, self.bus,

1245

886

self.dbus_object_path)

1246

887

1247

888

def notifychangeproperty(transform_func,

1248

889

dbus_name, type_func=lambda x: x,

1249

890

variant_level=1):

1250

891

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

1251

892

its changes to DBus.

1252

1253

transform_fun: Function that takes a value and a variant_level

1254

and transforms it to a D-Bus type.

893

894

transform_fun: Function that takes a value and transforms it

895

to a D-Bus type.

1255

896

dbus_name: D-Bus name of the variable

1256

897

type_func: Function that transform the value before sending it

1257

898

to the D-Bus. Default: no transform

1258

899

variant_level: D-Bus variant level. Default: 1

1259

900

"""

1260

attrname = "_{0}".format(dbus_name)

901

real_value = [None,]

1261

902

def setter(self, value):

903

old_value = real_value[0]

904

real_value[0] = value

1262

905

if hasattr(self, "dbus_object_path"):

1263

if (not hasattr(self, attrname) or

1264

type_func(getattr(self, attrname, None))

1265

!= type_func(value)):

1266

dbus_value = transform_func(type_func(value),

1267

variant_level

1268

=variant_level)

906

if type_func(old_value) != type_func(real_value[0]):

907

dbus_value = transform_func(type_func

908

(real_value[0]),

909

variant_level)

1269

910

self.PropertyChanged(dbus.String(dbus_name),

1270

911

dbus_value)

1271

setattr(self, attrname, value)

1272

912

1273

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

913

return property(lambda self: real_value[0], setter)

914

1274

915

1275

916

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1276

917

approvals_pending = notifychangeproperty(dbus.Boolean,

1284

925

checker is not None)

1285

926

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1286

927

"LastCheckedOK")

1287

last_checker_status = notifychangeproperty(dbus.Int16,

1288

"LastCheckerStatus")

1289

928

last_approval_request = notifychangeproperty(

1290

929

datetime_to_dbus, "LastApprovalRequest")

1291

930

approved_by_default = notifychangeproperty(dbus.Boolean,

1292

931

"ApprovedByDefault")

1293

approval_delay = notifychangeproperty(dbus.UInt64,

932

approval_delay = notifychangeproperty(dbus.UInt16,

1294

933

"ApprovalDelay",

1295

934

type_func =

1296

timedelta_to_milliseconds)

935

_timedelta_to_milliseconds)

1297

936

approval_duration = notifychangeproperty(

1298

dbus.UInt64, "ApprovalDuration",

1299

type_func = timedelta_to_milliseconds)

937

dbus.UInt16, "ApprovalDuration",

938

type_func = _timedelta_to_milliseconds)

1300

939

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

1301

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

940

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

1302

941

type_func =

1303

timedelta_to_milliseconds)

942

_timedelta_to_milliseconds)

1304

943

extended_timeout = notifychangeproperty(

1305

dbus.UInt64, "ExtendedTimeout",

1306

type_func = timedelta_to_milliseconds)

1307

interval = notifychangeproperty(dbus.UInt64,

944

dbus.UInt16, "ExtendedTimeout",

945

type_func = _timedelta_to_milliseconds)

946

interval = notifychangeproperty(dbus.UInt16,

1308

947

"Interval",

1309

948

type_func =

1310

timedelta_to_milliseconds)

949

_timedelta_to_milliseconds)

1311

950

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

1312

951

1313

952

del notifychangeproperty

1355

994

return r

1356

995

1357

996

def _reset_approved(self):

1358

self.approved = None

997

self._approved = None

1359

998

return False

1360

999

1361

1000

def approve(self, value=True):

1362

self.approved = value

1363

gobject.timeout_add(timedelta_to_milliseconds

1001

self.send_changedstate()

1002

self._approved = value

1003

gobject.timeout_add(_timedelta_to_milliseconds

1364

1004

(self.approval_duration),

1365

1005

self._reset_approved)

1366

self.send_changedstate()

1006

1367

1007

1368

1008

## D-Bus methods, signals & properties

1369

1009

_interface = "se.recompile.Mandos.Client"

1370

1010

1371

## Interfaces

1372

1373

@dbus_interface_annotations(_interface)

1374

def _foo(self):

1375

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

1376

"false"}

1377

1378

1011

## Signals

1379

1012

1380

1013

# CheckerCompleted - signal

1479

1112

access="readwrite")

1480

1113

def ApprovalDuration_dbus_property(self, value=None):

1481

1114

if value is None: # get

1482

return dbus.UInt64(timedelta_to_milliseconds(

1115

return dbus.UInt64(_timedelta_to_milliseconds(

1483

1116

self.approval_duration))

1484

1117

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

1485

1118

1499

1132

def Host_dbus_property(self, value=None):

1500

1133

if value is None: # get

1501

1134

return dbus.String(self.host)

1502

self.host = unicode(value)

1135

self.host = value

1503

1136

1504

1137

# Created - property

1505

1138

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

1506

1139

def Created_dbus_property(self):

1507

return datetime_to_dbus(self.created)

1140

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

1508

1141

1509

1142

# LastEnabled - property

1510

1143

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

1531

1164

return

1532

1165

return datetime_to_dbus(self.last_checked_ok)

1533

1166

1534

# LastCheckerStatus - property

1535

@dbus_service_property(_interface, signature="n",

1536

access="read")

1537

def LastCheckerStatus_dbus_property(self):

1538

return dbus.Int16(self.last_checker_status)

1539

1540

1167

# Expires - property

1541

1168

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

1542

1169

def Expires_dbus_property(self):

1553

1180

def Timeout_dbus_property(self, value=None):

1554

1181

if value is None: # get

1555

1182

return dbus.UInt64(self.timeout_milliseconds())

1556

old_timeout = self.timeout

1557

1183

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

1558

# Reschedule disabling

1559

if self.enabled:

1560

now = datetime.datetime.utcnow()

1561

self.expires += self.timeout - old_timeout

1562

if self.expires <= now:

1563

# The timeout has passed

1564

self.disable()

1565

else:

1566

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

1567

is None):

1568

return

1569

gobject.source_remove(self.disable_initiator_tag)

1570

self.disable_initiator_tag = (

1571

gobject.timeout_add(

1572

timedelta_to_milliseconds(self.expires - now),

1573

self.disable))

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))

1574

1205

1575

1206

# ExtendedTimeout - property

1576

1207

@dbus_service_property(_interface, signature="t",

1589

1220

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

1590

1221

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

1591

1222

return

1592

if self.enabled:

1593

# Reschedule checker run

1594

gobject.source_remove(self.checker_initiator_tag)

1595

self.checker_initiator_tag = (gobject.timeout_add

1596

(value, self.start_checker))

1597

self.start_checker() # Start one now, too

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

1598

1228

1599

1229

# Checker - property

1600

1230

@dbus_service_property(_interface, signature="s",

1602

1232

def Checker_dbus_property(self, value=None):

1603

1233

if value is None: # get

1604

1234

return dbus.String(self.checker_command)

1605

self.checker_command = unicode(value)

1235

self.checker_command = value

1606

1236

1607

1237

# CheckerRunning - property

1608

1238

@dbus_service_property(_interface, signature="b",

1637

1267

raise KeyError()

1638

1268

1639

1269

def __getattribute__(self, name):

1640

if name == '_pipe':

1270

if(name == '_pipe'):

1641

1271

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

1642

1272

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

1643

1273

data = self._pipe.recv()

1650

1280

return func

1651

1281

1652

1282

def __setattr__(self, name, value):

1653

if name == '_pipe':

1283

if(name == '_pipe'):

1654

1284

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

1655

1285

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

1656

1286

1287

class ClientDBusTransitional(ClientDBus):

1288

__metaclass__ = AlternateDBusNamesMetaclass

1657

1289

1658

1290

class ClientHandler(socketserver.BaseRequestHandler, object):

1659

1291

"""A class to handle client connections.

1742

1374

client.Rejected("Disabled")

1743

1375

return

1744

1376

1745

if client.approved or not client.approval_delay:

1377

if client._approved or not client.approval_delay:

1746

1378

#We are approved or approval is disabled

1747

1379

break

1748

elif client.approved is None:

1380

elif client._approved is None:

1749

1381

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

1750

1382

client.name)

1751

1383

if self.server.use_dbus:

1762

1394

return

1763

1395

1764

1396

#wait until timeout or approved

1397

#x = float(client

1398

# ._timedelta_to_milliseconds(delay))

1765

1399

time = datetime.datetime.now()

1766

1400

client.changedstate.acquire()

1767

client.changedstate.wait(

1768

float(timedelta_to_milliseconds(delay)

1769

/ 1000))

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1770

1404

client.changedstate.release()

1771

1405

time2 = datetime.datetime.now()

1772

1406

if (time2 - time) >= delay:

1788

1422

try:

1789

1423

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

1790

1424

except gnutls.errors.GNUTLSError as error:

1791

logger.warning("gnutls send failed",

1792

exc_info=error)

1425

logger.warning("gnutls send failed")

1793

1426

return

1794

1427

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

1795

1428

sent, len(client.secret)

1797

1430

sent_size += sent

1798

1431

1799

1432

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

1800

# bump the timeout using extended_timeout

1801

client.bump_timeout(client.extended_timeout)

1433

# bump the timeout as if seen

1434

client.checked_ok(client.extended_timeout)

1802

1435

if self.server.use_dbus:

1803

1436

# Emit D-Bus signal

1804

1437

client.GotSecret()

1809

1442

try:

1810

1443

session.bye()

1811

1444

except gnutls.errors.GNUTLSError as error:

1812

logger.warning("GnuTLS bye failed",

1813

exc_info=error)

1445

logger.warning("GnuTLS bye failed")

1814

1446

1815

1447

@staticmethod

1816

1448

def peer_certificate(session):

1872

1504

# Convert the buffer to a Python bytestring

1873

1505

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

1874

1506

# Convert the bytestring to hexadecimal notation

1875

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

1507

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

1876

1508

return hex_fpr

1877

1509

1878

1510

1881

1513

def sub_process_main(self, request, address):

1882

1514

try:

1883

1515

self.finish_request(request, address)

1884

except Exception:

1516

except:

1885

1517

self.handle_error(request, address)

1886

1518

self.close_request(request)

1887

1519

1888

1520

def process_request(self, request, address):

1889

1521

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

1890

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

1891

args = (request, address))

1892

proc.start()

1893

return proc

1522

multiprocessing.Process(target = self.sub_process_main,

1523

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

1894

1524

1895

1525

1896

1526

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1902

1532

"""

1903

1533

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1904

1534

1905

proc = MultiprocessingMixIn.process_request(self, request,

1906

client_address)

1535

super(MultiprocessingMixInWithPipe,

1536

self).process_request(request, client_address)

1907

1537

self.child_pipe.close()

1908

self.add_pipe(parent_pipe, proc)

1538

self.add_pipe(parent_pipe)

1909

1539

1910

def add_pipe(self, parent_pipe, proc):

1540

def add_pipe(self, parent_pipe):

1911

1541

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

1912

1542

raise NotImplementedError

1913

1543

1922

1552

use_ipv6: Boolean; to use IPv6 or not

1923

1553

"""

1924

1554

def __init__(self, server_address, RequestHandlerClass,

1925

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

1926

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

1927

creating a new one with socket.socket().

1928

"""

1555

interface=None, use_ipv6=True):

1929

1556

self.interface = interface

1930

1557

if use_ipv6:

1931

1558

self.address_family = socket.AF_INET6

1932

if socketfd is not None:

1933

# Save the file descriptor

1934

self.socketfd = socketfd

1935

# Save the original socket.socket() function

1936

self.socket_socket = socket.socket

1937

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

1938

#

1939

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

1940

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

1941

# patching socket.socket.)

1942

#

1943

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

1944

@functools.wraps(socket.socket)

1945

def socket_wrapper(*args, **kwargs):

1946

# Restore original function so subsequent calls are

1947

# not affected.

1948

socket.socket = self.socket_socket

1949

del self.socket_socket

1950

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

1951

# saved file descriptor.

1952

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

1953

# Replace socket.socket() function with wrapper

1954

socket.socket = socket_wrapper

1955

# The socketserver.TCPServer.__init__ will call

1956

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

1957

# socket_wrapper(), if socketfd was set.

1958

1559

socketserver.TCPServer.__init__(self, server_address,

1959

1560

RequestHandlerClass)

1960

1961

1561

def server_bind(self):

1962

1562

"""This overrides the normal server_bind() function

1963

1563

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

1971

1571

try:

1972

1572

self.socket.setsockopt(socket.SOL_SOCKET,

1973

1573

SO_BINDTODEVICE,

1974

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

1574

str(self.interface

1575

+ '\0'))

1975

1576

except socket.error as error:

1976

if error.errno == errno.EPERM:

1977

logger.error("No permission to bind to"

1978

" interface %s", self.interface)

1979

elif error.errno == errno.ENOPROTOOPT:

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:

1980

1582

logger.error("SO_BINDTODEVICE not available;"

1981

1583

" cannot bind to interface %s",

1982

1584

self.interface)

1983

elif error.errno == errno.ENODEV:

1984

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

1985

" cannot bind", self.interface)

1986

1585

else:

1987

1586

raise

1988

1587

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

1991

1590

if self.address_family == socket.AF_INET6:

1992

1591

any_address = "::" # in6addr_any

1993

1592

else:

1994

any_address = "0.0.0.0" # INADDR_ANY

1593

any_address = socket.INADDR_ANY

1995

1594

self.server_address = (any_address,

1996

1595

self.server_address[1])

1997

1596

elif not self.server_address[1]:

2018

1617

"""

2019

1618

def __init__(self, server_address, RequestHandlerClass,

2020

1619

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

2021

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

1620

gnutls_priority=None, use_dbus=True):

2022

1621

self.enabled = False

2023

1622

self.clients = clients

2024

1623

if self.clients is None:

2025

self.clients = {}

1624

self.clients = set()

2026

1625

self.use_dbus = use_dbus

2027

1626

self.gnutls_priority = gnutls_priority

2028

1627

IPv6_TCPServer.__init__(self, server_address,

2029

1628

RequestHandlerClass,

2030

1629

interface = interface,

2031

use_ipv6 = use_ipv6,

2032

socketfd = socketfd)

1630

use_ipv6 = use_ipv6)

2033

1631

def server_activate(self):

2034

1632

if self.enabled:

2035

1633

return socketserver.TCPServer.server_activate(self)

2036

2037

1634

def enable(self):

2038

1635

self.enabled = True

2039

2040

def add_pipe(self, parent_pipe, proc):

1636

def add_pipe(self, parent_pipe):

2041

1637

# Call "handle_ipc" for both data and EOF events

2042

1638

gobject.io_add_watch(parent_pipe.fileno(),

2043

1639

gobject.IO_IN | gobject.IO_HUP,

2044

1640

functools.partial(self.handle_ipc,

2045

1641

parent_pipe =

2046

parent_pipe,

2047

proc = proc))

2048

1642

parent_pipe))

1643

2049

1644

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

2050

proc = None, client_object=None):

2051

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

2052

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

2053

# Wait for other process to exit

2054

proc.join()

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):

2055

1662

return False

2056

1663

2057

1664

# Read a request from the child

2062

1669

fpr = request[1]

2063

1670

address = request[2]

2064

1671

2065

for c in self.clients.itervalues():

1672

for c in self.clients:

2066

1673

if c.fingerprint == fpr:

2067

1674

client = c

2068

1675

break

2081

1688

functools.partial(self.handle_ipc,

2082

1689

parent_pipe =

2083

1690

parent_pipe,

2084

proc = proc,

2085

1691

client_object =

2086

1692

client))

2087

1693

parent_pipe.send(True)

2113

1719

return True

2114

1720

2115

1721

2116

def rfc3339_duration_to_delta(duration):

2117

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

2118

2119

>>> rfc3339_duration_to_delta("P7D")

2120

datetime.timedelta(7)

2121

>>> rfc3339_duration_to_delta("PT60S")

2122

datetime.timedelta(0, 60)

2123

>>> rfc3339_duration_to_delta("PT60M")

2124

datetime.timedelta(0, 3600)

2125

>>> rfc3339_duration_to_delta("PT24H")

2126

datetime.timedelta(1)

2127

>>> rfc3339_duration_to_delta("P1W")

2128

datetime.timedelta(7)

2129

>>> rfc3339_duration_to_delta("PT5M30S")

2130

datetime.timedelta(0, 330)

2131

>>> rfc3339_duration_to_delta("P1DT3M20S")

2132

datetime.timedelta(1, 200)

2133

"""

2134

2135

# Parsing an RFC 3339 duration with regular expressions is not

2136

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

2137

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

2138

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

2139

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

2140

# avoid excessive use of external libraries.

2141

2142

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

2143

Token = collections.namedtuple("Token",

2144

("regexp", # To match token; if

2145

# "value" is not None,

2146

# must have a "group"

2147

# containing digits

2148

"value", # datetime.timedelta or

2149

# None

2150

"followers")) # Tokens valid after

2151

# this token

2152

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

2153

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

2154

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

2155

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

2156

datetime.timedelta(seconds=1),

2157

frozenset((token_end,)))

2158

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

2159

datetime.timedelta(minutes=1),

2160

frozenset((token_second, token_end)))

2161

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

2162

datetime.timedelta(hours=1),

2163

frozenset((token_minute, token_end)))

2164

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

2165

None,

2166

frozenset((token_hour, token_minute,

2167

token_second)))

2168

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

2169

datetime.timedelta(days=1),

2170

frozenset((token_time, token_end)))

2171

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

2172

datetime.timedelta(weeks=4),

2173

frozenset((token_day, token_end)))

2174

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

2175

datetime.timedelta(weeks=52),

2176

frozenset((token_month, token_end)))

2177

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

2178

datetime.timedelta(weeks=1),

2179

frozenset((token_end,)))

2180

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

2181

frozenset((token_year, token_month,

2182

token_day, token_time,

2183

token_week))),

2184

# Define starting values

2185

value = datetime.timedelta() # Value so far

2186

found_token = None

2187

followers = frozenset(token_duration,) # Following valid tokens

2188

s = duration # String left to parse

2189

# Loop until end token is found

2190

while found_token is not token_end:

2191

# Search for any currently valid tokens

2192

for token in followers:

2193

match = token.regexp.match(s)

2194

if match is not None:

2195

# Token found

2196

if token.value is not None:

2197

# Value found, parse digits

2198

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

2199

# Add to value so far

2200

value += factor * token.value

2201

# Strip token from string

2202

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

2203

# Go to found token

2204

found_token = token

2205

# Set valid next tokens

2206

followers = found_token.followers

2207

break

2208

else:

2209

# No currently valid tokens were found

2210

raise ValueError("Invalid RFC 3339 duration")

2211

# End token found

2212

return value

2213

2214

2215

1722

def string_to_delta(interval):

2216

1723

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

2217

1724

2228

1735

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

2229

1736

datetime.timedelta(0, 330)

2230

1737

"""

2231

2232

try:

2233

return rfc3339_duration_to_delta(interval)

2234

except ValueError:

2235

pass

2236

2237

1738

timevalue = datetime.timedelta(0)

2238

1739

for s in interval.split():

2239

1740

try:

2250

1751

elif suffix == "w":

2251

1752

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

2252

1753

else:

2253

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

2254

.format(suffix))

1754

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

2255

1755

except (ValueError, IndexError) as e:

2256

1756

raise ValueError(*(e.args))

2257

1757

timevalue += delta

2258

1758

return timevalue

2259

1759

2260

1760

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

2261

1785

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

2262

1786

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

2263

1787

2271

1795

sys.exit()

2272

1796

if not noclose:

2273

1797

# Close all standard open file descriptors

2274

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

1798

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

2275

1799

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

2276

1800

raise OSError(errno.ENODEV,

2277

"{0} not a character device"

2278

.format(os.devnull))

1801

"%s not a character device"

1802

% os.path.devnull)

2279

1803

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

2280

1804

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

2281

1805

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

2290

1814

2291

1815

parser = argparse.ArgumentParser()

2292

1816

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

2293

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

1817

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

2294

1818

help="show version number and exit")

2295

1819

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

2296

1820

help="Bind to interface IF")

2302

1826

help="Run self-test")

2303

1827

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

2304

1828

help="Debug mode; run in foreground and log"

2305

" to terminal", default=None)

1829

" to terminal")

2306

1830

parser.add_argument("--debuglevel", metavar="LEVEL",

2307

1831

help="Debug level for stdout output")

2308

1832

parser.add_argument("--priority", help="GnuTLS"

2315

1839

" files")

2316

1840

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

2317

1841

dest="use_dbus", help="Do not provide D-Bus"

2318

" system bus interface", default=None)

1842

" system bus interface")

2319

1843

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

2320

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

2321

default=None)

2322

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

2323

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

2324

" state", default=None)

2325

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

2326

help="Specify a file descriptor to a network"

2327

" socket to use instead of creating one")

2328

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

2329

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

2330

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

2331

help="Run in foreground", default=None)

2332

1844

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

2333

1845

options = parser.parse_args()

2334

1846

2335

1847

if options.check:

2343

1855

"port": "",

2344

1856

"debug": "False",

2345

1857

"priority":

2346

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:+SIGN-RSA-SHA224",

1858

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",

2347

1859

"servicename": "Mandos",

2348

1860

"use_dbus": "True",

2349

1861

"use_ipv6": "True",

2350

1862

"debuglevel": "",

2351

"restore": "True",

2352

"socket": "",

2353

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

2354

"foreground": "False",

2355

1863

}

2356

1864

2357

1865

# Parse config file for server-global settings

2362

1870

# Convert the SafeConfigParser object to a dict

2363

1871

server_settings = server_config.defaults()

2364

1872

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

2365

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

1873

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

2366

1874

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

2367

1875

option)

2368

1876

if server_settings["port"]:

2369

1877

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

2370

1878

"port")

2371

if server_settings["socket"]:

2372

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

2373

"socket")

2374

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

2375

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

2376

# happen with a supplied network socket.

2377

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

2378

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

2379

["socket"])

2380

1879

del server_config

2381

1880

2382

1881

# Override the settings from the config file with command line

2383

1882

# options, if set.

2384

1883

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

2385

1884

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

2386

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

2387

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

1885

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

2388

1886

value = getattr(options, option)

2389

1887

if value is not None:

2390

1888

server_settings[option] = value

2393

1891

for option in server_settings.keys():

2394

1892

if type(server_settings[option]) is str:

2395

1893

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

2396

# Force all boolean options to be boolean

2397

for option in ("debug", "use_dbus", "use_ipv6", "restore",

2398

"foreground"):

2399

server_settings[option] = bool(server_settings[option])

2400

# Debug implies foreground

2401

if server_settings["debug"]:

2402

server_settings["foreground"] = True

2403

1894

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

2404

1895

2405

1896

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

2409

1900

debuglevel = server_settings["debuglevel"]

2410

1901

use_dbus = server_settings["use_dbus"]

2411

1902

use_ipv6 = server_settings["use_ipv6"]

2412

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

2413

stored_state_file)

2414

foreground = server_settings["foreground"]

2415

2416

if debug:

2417

initlogger(debug, logging.DEBUG)

2418

else:

2419

if not debuglevel:

2420

initlogger(debug)

2421

else:

2422

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

2423

initlogger(debug, level)

2424

1903

2425

1904

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

2426

1905

syslogger.setFormatter(logging.Formatter

2427

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

2428

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

2429

.format(server_settings

2430

["servicename"])))

1906

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

1907

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

1908

% server_settings["servicename"]))

2431

1909

2432

1910

# Parse config file with clients

2433

client_config = configparser.SafeConfigParser(Client

2434

.client_defaults)

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)

2435

1920

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

2436

1921

"clients.conf"))

2437

1922

2446

1931

use_ipv6=use_ipv6,

2447

1932

gnutls_priority=

2448

1933

server_settings["priority"],

2449

use_dbus=use_dbus,

2450

socketfd=(server_settings["socket"]

2451

or None))

2452

if not foreground:

1934

use_dbus=use_dbus)

1935

if not debug:

2453

1936

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

2454

pidfile = None

2455

1937

try:

2456

1938

pidfile = open(pidfilename, "w")

2457

except IOError as e:

2458

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

2459

exc_info=e)

1939

except IOError:

1940

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

2460

1941

2461

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

1942

try:

1943

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

1944

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

1945

except KeyError:

2462

1946

try:

2463

uid = pwd.getpwnam(name).pw_uid

2464

gid = pwd.getpwnam(name).pw_gid

2465

break

1947

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

1948

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

2466

1949

except KeyError:

2467

continue

2468

else:

2469

uid = 65534

2470

gid = 65534

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

2471

1956

try:

2472

1957

os.setgid(gid)

2473

1958

os.setuid(uid)

2474

1959

except OSError as error:

2475

if error.errno != errno.EPERM:

1960

if error[0] != errno.EPERM:

2476

1961

raise error

2477

1962

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

2478

1971

if debug:

2479

1972

# Enable all possible GnuTLS debugging

2480

1973

2490

1983

.gnutls_global_set_log_function(debug_gnutls))

2491

1984

2492

1985

# Redirect stdin so all checkers get /dev/null

2493

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

1986

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

2494

1987

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

2495

1988

if null > 2:

2496

1989

os.close(null)

1990

else:

1991

# No console logging

1992

logger.removeHandler(console)

2497

1993

2498

1994

# Need to fork before connecting to D-Bus

2499

if not foreground:

1995

if not debug:

2500

1996

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

2501

1997

daemon()

2502

1998

2503

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

2504

# need to inform gobject that threads will be used.

2505

gobject.threads_init()

2506

2507

1999

global main_loop

2508

2000

# From the Avahi example code

2509

DBusGMainLoop(set_as_default=True)

2001

DBusGMainLoop(set_as_default=True )

2510

2002

main_loop = gobject.MainLoop()

2511

2003

bus = dbus.SystemBus()

2512

2004

# End of Avahi example code

2518

2010

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

2519

2011

do_not_queue=True))

2520

2012

except dbus.exceptions.NameExistsException as e:

2521

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

2013

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

2522

2014

use_dbus = False

2523

2015

server_settings["use_dbus"] = False

2524

2016

tcp_server.use_dbus = False

2525

2017

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2526

service = AvahiServiceToSyslog(name =

2527

server_settings["servicename"],

2528

servicetype = "_mandos._tcp",

2529

protocol = protocol, bus = bus)

2018

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

2019

servicetype = "_mandos._tcp",

2020

protocol = protocol, bus = bus)

2530

2021

if server_settings["interface"]:

2531

2022

service.interface = (if_nametoindex

2532

2023

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

2536

2027

2537

2028

client_class = Client

2538

2029

if use_dbus:

2539

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

2540

2541

client_settings = Client.config_parser(client_config)

2542

old_client_settings = {}

2543

clients_data = {}

2544

2545

# This is used to redirect stdout and stderr for checker processes

2546

global wnull

2547

wnull = open(os.devnull, "w") # A writable /dev/null

2548

# Only used if server is running in foreground but not in debug

2549

# mode

2550

if debug or not foreground:

2551

wnull.close()

2552

2553

# Get client data and settings from last running state.

2554

if server_settings["restore"]:

2555

try:

2556

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

2557

clients_data, old_client_settings = (pickle.load

2558

(stored_state))

2559

os.remove(stored_state_path)

2560

except IOError as e:

2561

if e.errno == errno.ENOENT:

2562

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

2563

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

2564

else:

2565

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

2566

exc_info=e)

2567

raise

2568

except EOFError as e:

2569

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

2570

"EOFError:", exc_info=e)

2571

2572

with PGPEngine() as pgp:

2573

for client_name, client in clients_data.iteritems():

2574

# Skip removed clients

2575

if client_name not in client_settings:

2576

continue

2577

2578

# Decide which value to use after restoring saved state.

2579

# We have three different values: Old config file,

2580

# new config file, and saved state.

2581

# New config value takes precedence if it differs from old

2582

# config value, otherwise use saved state.

2583

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

2584

try:

2585

# For each value in new config, check if it

2586

# differs from the old config value (Except for

2587

# the "secret" attribute)

2588

if (name != "secret" and

2589

value != old_client_settings[client_name]

2590

[name]):

2591

client[name] = value

2592

except KeyError:

2593

pass

2594

2595

# Clients who has passed its expire date can still be

2596

# enabled if its last checker was successful. Clients

2597

# whose checker succeeded before we stored its state is

2598

# assumed to have successfully run all checkers during

2599

# downtime.

2600

if client["enabled"]:

2601

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

2602

if not client["last_checked_ok"]:

2603

logger.warning(

2604

"disabling client {0} - Client never "

2605

"performed a successful checker"

2606

.format(client_name))

2607

client["enabled"] = False

2608

elif client["last_checker_status"] != 0:

2609

logger.warning(

2610

"disabling client {0} - Client "

2611

"last checker failed with error code {1}"

2612

.format(client_name,

2613

client["last_checker_status"]))

2614

client["enabled"] = False

2615

else:

2616

client["expires"] = (datetime.datetime

2617

.utcnow()

2618

+ client["timeout"])

2619

logger.debug("Last checker succeeded,"

2620

" keeping {0} enabled"

2621

.format(client_name))

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):

2622

2039

try:

2623

client["secret"] = (

2624

pgp.decrypt(client["encrypted_secret"],

2625

client_settings[client_name]

2626

["secret"]))

2627

except PGPError:

2628

# If decryption fails, we use secret from new settings

2629

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

2630

.format(client_name))

2631

client["secret"] = (

2632

client_settings[client_name]["secret"])

2633

2634

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

2635

for client_name in (set(old_client_settings)

2636

- set(client_settings)):

2637

del clients_data[client_name]

2638

for client_name in (set(client_settings)

2639

- set(old_client_settings)):

2640

clients_data[client_name] = client_settings[client_name]

2641

2642

# Create all client objects

2643

for client_name, client in clients_data.iteritems():

2644

tcp_server.clients[client_name] = client_class(

2645

name = client_name, settings = client,

2646

server_settings = server_settings)

2647

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()))

2648

2049

if not tcp_server.clients:

2649

2050

logger.warning("No clients defined")

2650

2651

if not foreground:

2652

if pidfile is not None:

2653

try:

2654

with pidfile:

2655

pid = os.getpid()

2656

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

2657

except IOError:

2658

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

2659

pidfilename, pid)

2660

del pidfile

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

2661

2064

del pidfilename

2065

2066

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

2662

2067

2663

2068

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

2664

2069

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

2665

2070

2666

2071

if use_dbus:

2667

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

2668

"se.bsnet.fukt.Mandos"})

2669

class MandosDBusService(DBusObjectWithProperties):

2072

class MandosDBusService(dbus.service.Object):

2670

2073

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

2671

2074

def __init__(self):

2672

2075

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

2673

2076

_interface = "se.recompile.Mandos"

2674

2077

2675

@dbus_interface_annotations(_interface)

2676

def _foo(self):

2677

return { "org.freedesktop.DBus.Property"

2678

".EmitsChangedSignal":

2679

"false"}

2680

2681

2078

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

2682

2079

def ClientAdded(self, objpath):

2683

2080

"D-Bus signal"

2697

2094

def GetAllClients(self):

2698

2095

"D-Bus method"

2699

2096

return dbus.Array(c.dbus_object_path

2700

for c in

2701

tcp_server.clients.itervalues())

2097

for c in tcp_server.clients)

2702

2098

2703

2099

@dbus.service.method(_interface,

2704

2100

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

2706

2102

"D-Bus method"

2707

2103

return dbus.Dictionary(

2708

2104

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

2709

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

2105

for c in tcp_server.clients),

2710

2106

signature="oa{sv}")

2711

2107

2712

2108

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

2713

2109

def RemoveClient(self, object_path):

2714

2110

"D-Bus method"

2715

for c in tcp_server.clients.itervalues():

2111

for c in tcp_server.clients:

2716

2112

if c.dbus_object_path == object_path:

2717

del tcp_server.clients[c.name]

2113

tcp_server.clients.remove(c)

2718

2114

c.remove_from_connection()

2719

2115

# Don't signal anything except ClientRemoved

2720

2116

c.disable(quiet=True)

2725

2121

2726

2122

del _interface

2727

2123

2728

mandos_dbus_service = MandosDBusService()

2124

class MandosDBusServiceTransitional(MandosDBusService):

2125

__metaclass__ = AlternateDBusNamesMetaclass

2126

mandos_dbus_service = MandosDBusServiceTransitional()

2729

2127

2730

2128

def cleanup():

2731

2129

"Cleanup function; run on exit"

2732

2130

service.cleanup()

2733

2131

2734

multiprocessing.active_children()

2735

wnull.close()

2736

if not (tcp_server.clients or client_settings):

2737

return

2738

2739

# Store client before exiting. Secrets are encrypted with key

2740

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

2741

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

2742

clients = {}

2743

with PGPEngine() as pgp:

2744

for client in tcp_server.clients.itervalues():

2745

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

2746

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

2747

key)

2748

client_dict = {}

2749

2750

# A list of attributes that can not be pickled

2751

# + secret.

2752

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

2753

"checker", "server_settings"))

2754

for name, typ in (inspect.getmembers

2755

(dbus.service.Object)):

2756

exclude.add(name)

2757

2758

client_dict["encrypted_secret"] = (client

2759

.encrypted_secret)

2760

for attr in client.client_structure:

2761

if attr not in exclude:

2762

client_dict[attr] = getattr(client, attr)

2763

2764

clients[client.name] = client_dict

2765

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

2766

2767

try:

2768

with (tempfile.NamedTemporaryFile

2769

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

2770

dir=os.path.dirname(stored_state_path),

2771

delete=False)) as stored_state:

2772

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

2773

tempname=stored_state.name

2774

os.rename(tempname, stored_state_path)

2775

except (IOError, OSError) as e:

2776

if not debug:

2777

try:

2778

os.remove(tempname)

2779

except NameError:

2780

pass

2781

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

2782

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

2783

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

2784

else:

2785

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

2786

exc_info=e)

2787

raise e

2788

2789

# Delete all clients, and settings from config

2790

2132

while tcp_server.clients:

2791

name, client = tcp_server.clients.popitem()

2133

client = tcp_server.clients.pop()

2792

2134

if use_dbus:

2793

2135

client.remove_from_connection()

2136

client.disable_hook = None

2794

2137

# Don't signal anything except ClientRemoved

2795

2138

client.disable(quiet=True)

2796

2139

if use_dbus:

2798

2141

mandos_dbus_service.ClientRemoved(client

2799

2142

.dbus_object_path,

2800

2143

client.name)

2801

client_settings.clear()

2802

2144

2803

2145

atexit.register(cleanup)

2804

2146

2805

for client in tcp_server.clients.itervalues():

2147

for client in tcp_server.clients:

2806

2148

if use_dbus:

2807

2149

# Emit D-Bus signal

2808

2150

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2809

# Need to initiate checking of clients

2810

if client.enabled:

2811

client.init_checker()

2151

client.enable()

2812

2152

2813

2153

tcp_server.enable()

2814

2154

tcp_server.server_activate()

2817

2157

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

2818

2158

if use_ipv6:

2819

2159

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

2820

" flowinfo %d, scope_id %d",

2821

*tcp_server.socket.getsockname())

2160

" flowinfo %d, scope_id %d"

2161

% tcp_server.socket.getsockname())

2822

2162

else: # IPv4

2823

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

2824

*tcp_server.socket.getsockname())

2163

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

2164

% tcp_server.socket.getsockname())

2825

2165

2826

2166

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

2827

2167

2830

2170

try:

2831

2171

service.activate()

2832

2172

except dbus.exceptions.DBusException as error:

2833

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

2173

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

2834

2174

cleanup()

2835

2175

sys.exit(1)

2836

2176

# End of Avahi example code

2843

2183

logger.debug("Starting main loop")

2844

2184

main_loop.run()

2845

2185

except AvahiError as error:

2846

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

2186

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

2847

2187

cleanup()

2848

2188

sys.exit(1)

2849

2189

except KeyboardInterrupt:

2854

2194

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

2855

2195

cleanup()

2856

2196

2197

2857

2198

if __name__ == '__main__':

2858

2199

main()