/mandos/trunk : revision 505.2.11

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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 = "1.6.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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version = "1.4.1"

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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", "")

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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

376

self.last_connect = None

377

self._approved = None

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

379

True)

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self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

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config["approval_delay"])

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self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

560

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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,

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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

389

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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397

# Already enabled

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return

584

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

585

self.enabled = True

586

self.last_enabled = datetime.datetime.utcnow()

587

self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

591

"""Disable this client."""

592

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

593

return False

594

if not quiet:

595

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

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

597

gobject.source_remove(self.disable_initiator_tag)

598

self.disable_initiator_tag = None

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self.expires = None

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

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gobject.source_remove(self.checker_initiator_tag)

602

self.checker_initiator_tag = None

603

self.stop_checker()

604

self.enabled = False

605

if not quiet:

606

self.send_changedstate()

607

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

608

return False

609

610

def __del__(self):

611

self.disable()

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613

def init_checker(self):

614

400

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

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# and every interval from then on.

616

if self.checker_initiator_tag is not None:

617

gobject.source_remove(self.checker_initiator_tag)

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402

self.checker_initiator_tag = (gobject.timeout_add

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(self.interval_milliseconds(),

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404

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)

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

624

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self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

626

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self.disable))

410

self.enabled = True

411

self.last_enabled = datetime.datetime.utcnow()

627

412

# Also start a new checker *right now*.

628

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self.start_checker()

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415

def disable(self, quiet=True):

416

"""Disable this client."""

417

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

418

return False

419

if not quiet:

420

self.send_changedstate()

421

if not quiet:

422

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

423

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

424

gobject.source_remove(self.disable_initiator_tag)

425

self.disable_initiator_tag = None

426

self.expires = None

427

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

428

gobject.source_remove(self.checker_initiator_tag)

429

self.checker_initiator_tag = None

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

433

self.enabled = False

434

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

435

return False

436

437

def __del__(self):

438

self.disable_hook = None

439

self.disable()

440

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

466

self.last_checked_ok = datetime.datetime.utcnow()

658

467

if self.disable_initiator_tag is not None:

659

468

gobject.source_remove(self.disable_initiator_tag)

660

self.disable_initiator_tag = None

661

469

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

662

470

self.disable_initiator_tag = (gobject.timeout_add

663

(timedelta_to_milliseconds

471

(_timedelta_to_milliseconds

664

472

(timeout), self.disable))

665

473

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

666

474

673

481

If a checker already exists, leave it running and do

674

482

nothing."""

675

483

# 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

484

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

485

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

486

# client would inevitably timeout, since no checker would get

487

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

680

488

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

681

489

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

682

490

# should be.

696

504

self.current_checker_command)

697

505

# Start a new checker if needed

698

506

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

507

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

508

# In case checker_command has exactly one % operator

509

command = self.checker_command % self.host

510

except TypeError:

511

# Escape attributes for the shell

512

escaped_attrs = dict(

513

(attr,

514

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

515

errors=

516

'replace')))

517

for attr in

518

self.runtime_expansions)

519

520

try:

521

command = self.checker_command % escaped_attrs

522

except TypeError as error:

523

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

524

' %s', self.checker_command, error)

525

return True # Try again later

710

526

self.current_checker_command = command

711

527

try:

712

528

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

715

531

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

716

532

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

717

533

# 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

534

self.checker = subprocess.Popen(command,

727

535

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:

536

shell=True, cwd="/")

537

self.checker_callback_tag = (gobject.child_watch_add

538

(self.checker.pid,

539

self.checker_callback,

540

data=command))

541

# The checker may have completed before the gobject

542

# watch was added. Check for this.

741

543

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

544

if pid:

545

gobject.source_remove(self.checker_callback_tag)

546

self.checker_callback(pid, status, command)

742

547

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)

548

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

549

error)

752

550

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

753

551

return True

754

552

761

559

return

762

560

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

763

561

try:

764

self.checker.terminate()

562

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

765

563

#time.sleep(0.5)

766

564

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

767

# self.checker.kill()

565

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

768

566

except OSError as error:

769

567

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

770

568

raise

787

585

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

788

586

if byte_arrays and signature != "ay":

789

587

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

790

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

588

" signature %r" % signature)

791

589

def decorator(func):

792

590

func._dbus_is_property = True

793

591

func._dbus_interface = dbus_interface

801

599

return decorator

802

600

803

601

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

602

class DBusPropertyException(dbus.exceptions.DBusException):

842

603

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

843

604

"""

866

627

"""

867

628

868

629

@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)

630

def _is_dbus_property(obj):

631

return getattr(obj, "_dbus_is_property", False)

877

632

878

def _get_all_dbus_things(self, thing):

633

def _get_all_dbus_properties(self):

879

634

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

880

635

"""

881

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

882

name),

883

athing.__get__(self))

636

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

884

637

for cls in self.__class__.__mro__

885

for name, athing in

886

inspect.getmembers(cls,

887

self._is_dbus_thing(thing)))

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

888

640

889

641

def _get_dbus_property(self, interface_name, property_name):

890

642

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

892

644

"""

893

645

for cls in self.__class__.__mro__:

894

646

for name, value in (inspect.getmembers

895

(cls,

896

self._is_dbus_thing("property"))):

647

(cls, self._is_dbus_property)):

897

648

if (value._dbus_name == property_name

898

649

and value._dbus_interface == interface_name):

899

650

return value.__get__(self)

928

679

# signatures other than "ay".

929

680

if prop._dbus_signature != "ay":

930

681

raise ValueError

931

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

932

for byte in value))

682

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

683

for byte in value))

933

684

prop(value)

934

685

935

686

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

940

691

941

692

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

942

693

"""

943

properties = {}

944

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

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

945

696

if (interface_name

946

697

and interface_name != prop._dbus_interface):

947

698

# Interface non-empty but did not match

951

702

continue

952

703

value = prop()

953

704

if not hasattr(value, "variant_level"):

954

properties[name] = value

705

all[name] = value

955

706

continue

956

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

957

value.variant_level+1)

958

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

707

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

708

value.variant_level+1)

709

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

959

710

960

711

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

961

712

out_signature="s",

962

713

path_keyword='object_path',

963

714

connection_keyword='connection')

964

715

def Introspect(self, object_path, connection):

965

"""Overloading of standard D-Bus method.

966

967

Inserts property tags and interface annotation tags.

716

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

968

717

"""

969

718

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

970

719

connection)

977

726

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

978

727

return e

979

728

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

980

# Add property tags

981

729

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

982

730

for name, prop

983

in self._get_all_dbus_things("property")

731

in self._get_all_dbus_properties()

984

732

if prop._dbus_interface

985

733

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

986

734

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

735

# Add the names to the return values for the

1019

736

# "org.freedesktop.DBus.Properties" methods

1020

737

if (if_tag.getAttribute("name")

1035

752

except (AttributeError, xml.dom.DOMException,

1036

753

xml.parsers.expat.ExpatError) as error:

1037

754

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

1038

exc_info=error)

755

error)

1039

756

return xmlstring

1040

757

1041

758

1042

def datetime_to_dbus(dt, variant_level=0):

759

def datetime_to_dbus (dt, variant_level=0):

1043

760

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

1044

761

if dt is None:

1045

762

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

1046

763

return dbus.String(dt.isoformat(),

1047

764

variant_level=variant_level)

1048

765

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).

766

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

767

.__metaclass__):

768

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

769

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

1072

770

"""

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):

771

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

772

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

773

# methods, signals, or properties in them

774

for base in (b for b in bases

775

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

776

# Go though all attributes of the base class

777

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

1080

778

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

1081

779

# with the wrong interface name

1082

780

if (not hasattr(attribute, "_dbus_interface")

1083

781

or not attribute._dbus_interface

1084

.startswith(orig_interface_name)):

782

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

1085

783

continue

1086

784

# Create an alternate D-Bus interface name based on

1087

785

# the current name

1088

786

alt_interface = (attribute._dbus_interface

1089

.replace(orig_interface_name,

1090

alt_interface_name))

1091

interface_names.add(alt_interface)

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1092

789

# Is this a D-Bus signal?

1093

790

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

1094

# Extract the original non-method undecorated

1095

# function by black magic

791

# Extract the original non-method function by

792

# black magic

1096

793

nonmethod_func = (dict(

1097

794

zip(attribute.func_code.co_freevars,

1098

795

attribute.__closure__))["func"]

1109

806

nonmethod_func.func_name,

1110

807

nonmethod_func.func_defaults,

1111

808

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

809

# 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

810

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

811

# signals gets sent when the function is called

1122

812

def fixscope(func1, func2):

1123

813

"""This function is a scope container to pass

1124

814

func1 and func2 to the "call_both" function

1131

821

return call_both

1132

822

# Create the "call_both" function and add it to

1133

823

# the class

1134

attr[attrname] = fixscope(attribute, new_function)

824

attr[attrname] = fixscope(attribute,

825

new_function)

1135

826

# Is this a D-Bus method?

1136

827

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

1137

828

# Create a new, but exactly alike, function

1148

839

attribute.func_name,

1149

840

attribute.func_defaults,

1150

841

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

842

# Is this a D-Bus property?

1158

843

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

1159

844

# Create a new, but exactly alike, function

1173

858

attribute.func_name,

1174

859

attribute.func_defaults,

1175

860

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"})

861

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

862

1221

863

class ClientDBus(Client, DBusObjectWithProperties):

1222

864

"""A Client class using D-Bus

1223

865

1232

874

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

1233

875

1234

876

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

877

self._approvals_pending = 0

1235

878

self.bus = bus

1236

879

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

1237

880

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

1243

886

("/clients/" + client_object_name))

1244

887

DBusObjectWithProperties.__init__(self, self.bus,

1245

888

self.dbus_object_path)

1246

889

1247

890

def notifychangeproperty(transform_func,

1248

891

dbus_name, type_func=lambda x: x,

1249

892

variant_level=1):

1250

893

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

1251

894

its changes to DBus.

1252

895

1253

896

transform_fun: Function that takes a value and a variant_level

1254

897

and transforms it to a D-Bus type.

1255

898

dbus_name: D-Bus name of the variable

1272

915

1273

916

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

1274

917

918

1275

919

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1276

920

approvals_pending = notifychangeproperty(dbus.Boolean,

1277

921

"ApprovalPending",

1284

928

checker is not None)

1285

929

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1286

930

"LastCheckedOK")

1287

last_checker_status = notifychangeproperty(dbus.Int16,

1288

"LastCheckerStatus")

1289

931

last_approval_request = notifychangeproperty(

1290

932

datetime_to_dbus, "LastApprovalRequest")

1291

933

approved_by_default = notifychangeproperty(dbus.Boolean,

1292

934

"ApprovedByDefault")

1293

approval_delay = notifychangeproperty(dbus.UInt64,

935

approval_delay = notifychangeproperty(dbus.UInt16,

1294

936

"ApprovalDelay",

1295

937

type_func =

1296

timedelta_to_milliseconds)

938

_timedelta_to_milliseconds)

1297

939

approval_duration = notifychangeproperty(

1298

dbus.UInt64, "ApprovalDuration",

1299

type_func = timedelta_to_milliseconds)

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1300

942

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

1301

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

943

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

1302

944

type_func =

1303

timedelta_to_milliseconds)

945

_timedelta_to_milliseconds)

1304

946

extended_timeout = notifychangeproperty(

1305

dbus.UInt64, "ExtendedTimeout",

1306

type_func = timedelta_to_milliseconds)

1307

interval = notifychangeproperty(dbus.UInt64,

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1308

950

"Interval",

1309

951

type_func =

1310

timedelta_to_milliseconds)

952

_timedelta_to_milliseconds)

1311

953

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

1312

954

1313

955

del notifychangeproperty

1355

997

return r

1356

998

1357

999

def _reset_approved(self):

1358

self.approved = None

1000

self._approved = None

1359

1001

return False

1360

1002

1361

1003

def approve(self, value=True):

1362

self.approved = value

1363

gobject.timeout_add(timedelta_to_milliseconds

1004

self.send_changedstate()

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1364

1007

(self.approval_duration),

1365

1008

self._reset_approved)

1366

self.send_changedstate()

1009

1367

1010

1368

1011

## D-Bus methods, signals & properties

1369

1012

_interface = "se.recompile.Mandos.Client"

1370

1013

1371

## Interfaces

1372

1373

@dbus_interface_annotations(_interface)

1374

def _foo(self):

1375

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

1376

"false"}

1377

1378

1014

## Signals

1379

1015

1380

1016

# CheckerCompleted - signal

1479

1115

access="readwrite")

1480

1116

def ApprovalDuration_dbus_property(self, value=None):

1481

1117

if value is None: # get

1482

return dbus.UInt64(timedelta_to_milliseconds(

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1483

1119

self.approval_duration))

1484

1120

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

1485

1121

1499

1135

def Host_dbus_property(self, value=None):

1500

1136

if value is None: # get

1501

1137

return dbus.String(self.host)

1502

self.host = unicode(value)

1138

self.host = value

1503

1139

1504

1140

# Created - property

1505

1141

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

1506

1142

def Created_dbus_property(self):

1507

return datetime_to_dbus(self.created)

1143

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

1508

1144

1509

1145

# LastEnabled - property

1510

1146

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

1531

1167

return

1532

1168

return datetime_to_dbus(self.last_checked_ok)

1533

1169

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

1170

# Expires - property

1541

1171

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

1542

1172

def Expires_dbus_property(self):

1553

1183

def Timeout_dbus_property(self, value=None):

1554

1184

if value is None: # get

1555

1185

return dbus.UInt64(self.timeout_milliseconds())

1556

old_timeout = self.timeout

1557

1186

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))

1187

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

1188

return

1189

# Reschedule timeout

1190

gobject.source_remove(self.disable_initiator_tag)

1191

self.disable_initiator_tag = None

1192

self.expires = None

1193

time_to_die = _timedelta_to_milliseconds((self

1194

.last_checked_ok

1195

+ self.timeout)

1196

- datetime.datetime

1197

.utcnow())

1198

if time_to_die <= 0:

1199

# The timeout has passed

1200

self.disable()

1201

else:

1202

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

1203

+ datetime.timedelta(milliseconds =

1204

time_to_die))

1205

self.disable_initiator_tag = (gobject.timeout_add

1206

(time_to_die, self.disable))

1574

1207

1575

1208

# ExtendedTimeout - property

1576

1209

@dbus_service_property(_interface, signature="t",

1589

1222

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

1590

1223

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

1591

1224

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

1225

# Reschedule checker run

1226

gobject.source_remove(self.checker_initiator_tag)

1227

self.checker_initiator_tag = (gobject.timeout_add

1228

(value, self.start_checker))

1229

self.start_checker() # Start one now, too

1598

1230

1599

1231

# Checker - property

1600

1232

@dbus_service_property(_interface, signature="s",

1602

1234

def Checker_dbus_property(self, value=None):

1603

1235

if value is None: # get

1604

1236

return dbus.String(self.checker_command)

1605

self.checker_command = unicode(value)

1237

self.checker_command = value

1606

1238

1607

1239

# CheckerRunning - property

1608

1240

@dbus_service_property(_interface, signature="b",

1637

1269

raise KeyError()

1638

1270

1639

1271

def __getattribute__(self, name):

1640

if name == '_pipe':

1272

if(name == '_pipe'):

1641

1273

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

1642

1274

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

1643

1275

data = self._pipe.recv()

1650

1282

return func

1651

1283

1652

1284

def __setattr__(self, name, value):

1653

if name == '_pipe':

1285

if(name == '_pipe'):

1654

1286

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

1655

1287

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

1656

1288

1289

class ClientDBusTransitional(ClientDBus):

1290

__metaclass__ = AlternateDBusNamesMetaclass

1657

1291

1658

1292

class ClientHandler(socketserver.BaseRequestHandler, object):

1659

1293

"""A class to handle client connections.

1742

1376

client.Rejected("Disabled")

1743

1377

return

1744

1378

1745

if client.approved or not client.approval_delay:

1379

if client._approved or not client.approval_delay:

1746

1380

#We are approved or approval is disabled

1747

1381

break

1748

elif client.approved is None:

1382

elif client._approved is None:

1749

1383

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

1750

1384

client.name)

1751

1385

if self.server.use_dbus:

1764

1398

#wait until timeout or approved

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)

1798

1431

1799

1432

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

1800

1433

# bump the timeout using extended_timeout

1801

client.bump_timeout(client.extended_timeout)

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

1522

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

1891

args = (request, address))

1523

args = (request,

1524

address))

1892

1525

proc.start()

1893

1526

return proc

1894

1527

1922

1555

use_ipv6: Boolean; to use IPv6 or not

1923

1556

"""

1924

1557

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

"""

1558

interface=None, use_ipv6=True):

1929

1559

self.interface = interface

1930

1560

if use_ipv6:

1931

1561

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

1562

socketserver.TCPServer.__init__(self, server_address,

1959

1563

RequestHandlerClass)

1960

1961

1564

def server_bind(self):

1962

1565

"""This overrides the normal server_bind() function

1963

1566

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

1971

1574

try:

1972

1575

self.socket.setsockopt(socket.SOL_SOCKET,

1973

1576

SO_BINDTODEVICE,

1974

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

1577

str(self.interface

1578

+ '\0'))

1975

1579

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:

1580

if error[0] == errno.EPERM:

1581

logger.error("No permission to"

1582

" bind to interface %s",

1583

self.interface)

1584

elif error[0] == errno.ENOPROTOOPT:

1980

1585

logger.error("SO_BINDTODEVICE not available;"

1981

1586

" cannot bind to interface %s",

1982

1587

self.interface)

1983

elif error.errno == errno.ENODEV:

1984

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

1985

" cannot bind", self.interface)

1986

1588

else:

1987

1589

raise

1988

1590

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

1991

1593

if self.address_family == socket.AF_INET6:

1992

1594

any_address = "::" # in6addr_any

1993

1595

else:

1994

any_address = "0.0.0.0" # INADDR_ANY

1596

any_address = socket.INADDR_ANY

1995

1597

self.server_address = (any_address,

1996

1598

self.server_address[1])

1997

1599

elif not self.server_address[1]:

2018

1620

"""

2019

1621

def __init__(self, server_address, RequestHandlerClass,

2020

1622

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

2021

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

1623

gnutls_priority=None, use_dbus=True):

2022

1624

self.enabled = False

2023

1625

self.clients = clients

2024

1626

if self.clients is None:

2025

self.clients = {}

1627

self.clients = set()

2026

1628

self.use_dbus = use_dbus

2027

1629

self.gnutls_priority = gnutls_priority

2028

1630

IPv6_TCPServer.__init__(self, server_address,

2029

1631

RequestHandlerClass,

2030

1632

interface = interface,

2031

use_ipv6 = use_ipv6,

2032

socketfd = socketfd)

1633

use_ipv6 = use_ipv6)

2033

1634

def server_activate(self):

2034

1635

if self.enabled:

2035

1636

return socketserver.TCPServer.server_activate(self)

2048

1649

2049

1650

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

2050

1651

proc = None, client_object=None):

1652

condition_names = {

1653

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

1654

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

1655

# blocking).

1656

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

1657

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

1658

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

1659

# broken, usually for pipes and

1660

# sockets).

1661

}

1662

conditions_string = ' | '.join(name

1663

for cond, name in

1664

condition_names.iteritems()

1665

if cond & condition)

2051

1666

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

2052

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

1667

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

2053

1668

# Wait for other process to exit

2054

1669

proc.join()

2055

1670

return False

2062

1677

fpr = request[1]

2063

1678

address = request[2]

2064

1679

2065

for c in self.clients.itervalues():

1680

for c in self.clients:

2066

1681

if c.fingerprint == fpr:

2067

1682

client = c

2068

1683

break

2113

1728

return True

2114

1729

2115

1730

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

1731

def string_to_delta(interval):

2216

1732

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

2217

1733

2228

1744

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

2229

1745

datetime.timedelta(0, 330)

2230

1746

"""

2231

2232

try:

2233

return rfc3339_duration_to_delta(interval)

2234

except ValueError:

2235

pass

2236

2237

1747

timevalue = datetime.timedelta(0)

2238

1748

for s in interval.split():

2239

1749

try:

2250

1760

elif suffix == "w":

2251

1761

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

2252

1762

else:

2253

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

2254

.format(suffix))

1763

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

2255

1764

except (ValueError, IndexError) as e:

2256

1765

raise ValueError(*(e.args))

2257

1766

timevalue += delta

2258

1767

return timevalue

2259

1768

2260

1769

1770

def if_nametoindex(interface):

1771

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

1772

1773

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

1774

global if_nametoindex

1775

try:

1776

if_nametoindex = (ctypes.cdll.LoadLibrary

1777

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

1778

.if_nametoindex)

1779

except (OSError, AttributeError):

1780

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

1781

def if_nametoindex(interface):

1782

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

1783

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

1784

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

1785

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1786

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

1787

interface))

1788

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

1789

ifreq[16:20])[0]

1790

return interface_index

1791

return if_nametoindex(interface)

1792

1793

2261

1794

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

2262

1795

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

2263

1796

2271

1804

sys.exit()

2272

1805

if not noclose:

2273

1806

# Close all standard open file descriptors

2274

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

1807

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

2275

1808

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

2276

1809

raise OSError(errno.ENODEV,

2277

"{0} not a character device"

2278

.format(os.devnull))

1810

"%s not a character device"

1811

% os.path.devnull)

2279

1812

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

2280

1813

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

2281

1814

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

2290

1823

2291

1824

parser = argparse.ArgumentParser()

2292

1825

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

2293

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

1826

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

2294

1827

help="show version number and exit")

2295

1828

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

2296

1829

help="Bind to interface IF")

2302

1835

help="Run self-test")

2303

1836

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

2304

1837

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

2305

" to terminal", default=None)

1838

" to terminal")

2306

1839

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

2307

1840

help="Debug level for stdout output")

2308

1841

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

2315

1848

" files")

2316

1849

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

2317

1850

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

2318

" system bus interface", default=None)

1851

" system bus interface")

2319

1852

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

1853

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

2333

1854

options = parser.parse_args()

2334

1855

2335

1856

if options.check:

2348

1869

"use_dbus": "True",

2349

1870

"use_ipv6": "True",

2350

1871

"debuglevel": "",

2351

"restore": "True",

2352

"socket": "",

2353

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

2354

"foreground": "False",

2355

1872

}

2356

1873

2357

1874

# Parse config file for server-global settings

2362

1879

# Convert the SafeConfigParser object to a dict

2363

1880

server_settings = server_config.defaults()

2364

1881

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

2365

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

1882

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

2366

1883

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

2367

1884

option)

2368

1885

if server_settings["port"]:

2369

1886

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

2370

1887

"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

1888

del server_config

2381

1889

2382

1890

# Override the settings from the config file with command line

2383

1891

# options, if set.

2384

1892

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

2385

1893

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

2386

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

2387

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

1894

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

2388

1895

value = getattr(options, option)

2389

1896

if value is not None:

2390

1897

server_settings[option] = value

2393

1900

for option in server_settings.keys():

2394

1901

if type(server_settings[option]) is str:

2395

1902

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

1903

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

2404

1904

2405

1905

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

2409

1909

debuglevel = server_settings["debuglevel"]

2410

1910

use_dbus = server_settings["use_dbus"]

2411

1911

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

1912

2425

1913

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

2426

1914

syslogger.setFormatter(logging.Formatter

2427

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

2428

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

2429

.format(server_settings

2430

["servicename"])))

1915

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

1916

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

1917

% server_settings["servicename"]))

2431

1918

2432

1919

# Parse config file with clients

2433

client_config = configparser.SafeConfigParser(Client

2434

.client_defaults)

1920

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

1921

"extended_timeout": "15m",

1922

"interval": "2m",

1923

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

1924

"host": "",

1925

"approval_delay": "0s",

1926

"approval_duration": "1s",

1927

}

1928

client_config = configparser.SafeConfigParser(client_defaults)

2435

1929

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

2436

1930

"clients.conf"))

2437

1931

2446

1940

use_ipv6=use_ipv6,

2447

1941

gnutls_priority=

2448

1942

server_settings["priority"],

2449

use_dbus=use_dbus,

2450

socketfd=(server_settings["socket"]

2451

or None))

2452

if not foreground:

2453

pidfilename = "/run/mandos.pid"

2454

pidfile = None

1943

use_dbus=use_dbus)

1944

if not debug:

1945

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

2455

1946

try:

2456

1947

pidfile = open(pidfilename, "w")

2457

except IOError as e:

2458

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

2459

exc_info=e)

1948

except IOError:

1949

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

2460

1950

2461

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

1951

try:

1952

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

1953

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

1954

except KeyError:

2462

1955

try:

2463

uid = pwd.getpwnam(name).pw_uid

2464

gid = pwd.getpwnam(name).pw_gid

2465

break

1956

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

1957

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

2466

1958

except KeyError:

2467

continue

2468

else:

2469

uid = 65534

2470

gid = 65534

1959

try:

1960

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

1961

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

1962

except KeyError:

1963

uid = 65534

1964

gid = 65534

2471

1965

try:

2472

1966

os.setgid(gid)

2473

1967

os.setuid(uid)

2474

1968

except OSError as error:

2475

if error.errno != errno.EPERM:

1969

if error[0] != errno.EPERM:

2476

1970

raise error

2477

1971

1972

if not debug and not debuglevel:

1973

syslogger.setLevel(logging.WARNING)

1974

console.setLevel(logging.WARNING)

1975

if debuglevel:

1976

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

1977

syslogger.setLevel(level)

1978

console.setLevel(level)

1979

2478

1980

if debug:

2479

1981

# Enable all possible GnuTLS debugging

2480

1982

2490

1992

.gnutls_global_set_log_function(debug_gnutls))

2491

1993

2492

1994

# Redirect stdin so all checkers get /dev/null

2493

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

1995

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

2494

1996

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

2495

1997

if null > 2:

2496

1998

os.close(null)

1999

else:

2000

# No console logging

2001

logger.removeHandler(console)

2497

2002

2498

2003

# Need to fork before connecting to D-Bus

2499

if not foreground:

2004

if not debug:

2500

2005

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

2501

2006

daemon()

2502

2007

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

2008

global main_loop

2508

2009

# From the Avahi example code

2509

DBusGMainLoop(set_as_default=True)

2010

DBusGMainLoop(set_as_default=True )

2510

2011

main_loop = gobject.MainLoop()

2511

2012

bus = dbus.SystemBus()

2512

2013

# End of Avahi example code

2518

2019

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

2519

2020

do_not_queue=True))

2520

2021

except dbus.exceptions.NameExistsException as e:

2521

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

2022

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

2522

2023

use_dbus = False

2523

2024

server_settings["use_dbus"] = False

2524

2025

tcp_server.use_dbus = False

2525

2026

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)

2027

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

2028

servicetype = "_mandos._tcp",

2029

protocol = protocol, bus = bus)

2530

2030

if server_settings["interface"]:

2531

2031

service.interface = (if_nametoindex

2532

2032

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

2536

2036

2537

2037

client_class = Client

2538

2038

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))

2039

client_class = functools.partial(ClientDBusTransitional,

2040

bus = bus)

2041

def client_config_items(config, section):

2042

special_settings = {

2043

"approved_by_default":

2044

lambda: config.getboolean(section,

2045

"approved_by_default"),

2046

}

2047

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

2622

2048

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

2049

yield (name, special_settings[name]())

2050

except KeyError:

2051

yield (name, value)

2052

2053

tcp_server.clients.update(set(

2054

client_class(name = section,

2055

config= dict(client_config_items(

2056

client_config, section)))

2057

for section in client_config.sections()))

2648

2058

if not tcp_server.clients:

2649

2059

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

2060

2061

if not debug:

2062

try:

2063

with pidfile:

2064

pid = os.getpid()

2065

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

2066

del pidfile

2067

except IOError:

2068

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

2069

pidfilename, pid)

2070

except NameError:

2071

# "pidfile" was never created

2072

pass

2661

2073

del pidfilename

2074

2075

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

2662

2076

2663

2077

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

2664

2078

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

2665

2079

2666

2080

if use_dbus:

2667

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

2668

"se.bsnet.fukt.Mandos"})

2669

class MandosDBusService(DBusObjectWithProperties):

2081

class MandosDBusService(dbus.service.Object):

2670

2082

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

2671

2083

def __init__(self):

2672

2084

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

2673

2085

_interface = "se.recompile.Mandos"

2674

2086

2675

@dbus_interface_annotations(_interface)

2676

def _foo(self):

2677

return { "org.freedesktop.DBus.Property"

2678

".EmitsChangedSignal":

2679

"false"}

2680

2681

2087

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

2682

2088

def ClientAdded(self, objpath):

2683

2089

"D-Bus signal"

2697

2103

def GetAllClients(self):

2698

2104

"D-Bus method"

2699

2105

return dbus.Array(c.dbus_object_path

2700

for c in

2701

tcp_server.clients.itervalues())

2106

for c in tcp_server.clients)

2702

2107

2703

2108

@dbus.service.method(_interface,

2704

2109

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

2706

2111

"D-Bus method"

2707

2112

return dbus.Dictionary(

2708

2113

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

2709

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

2114

for c in tcp_server.clients),

2710

2115

signature="oa{sv}")

2711

2116

2712

2117

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

2713

2118

def RemoveClient(self, object_path):

2714

2119

"D-Bus method"

2715

for c in tcp_server.clients.itervalues():

2120

for c in tcp_server.clients:

2716

2121

if c.dbus_object_path == object_path:

2717

del tcp_server.clients[c.name]

2122

tcp_server.clients.remove(c)

2718

2123

c.remove_from_connection()

2719

2124

# Don't signal anything except ClientRemoved

2720

2125

c.disable(quiet=True)

2725

2130

2726

2131

del _interface

2727

2132

2728

mandos_dbus_service = MandosDBusService()

2133

class MandosDBusServiceTransitional(MandosDBusService):

2134

__metaclass__ = AlternateDBusNamesMetaclass

2135

mandos_dbus_service = MandosDBusServiceTransitional()

2729

2136

2730

2137

def cleanup():

2731

2138

"Cleanup function; run on exit"

2732

2139

service.cleanup()

2733

2140

2734

2141

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

2142

while tcp_server.clients:

2791

name, client = tcp_server.clients.popitem()

2143

client = tcp_server.clients.pop()

2792

2144

if use_dbus:

2793

2145

client.remove_from_connection()

2146

client.disable_hook = None

2794

2147

# Don't signal anything except ClientRemoved

2795

2148

client.disable(quiet=True)

2796

2149

if use_dbus:

2798

2151

mandos_dbus_service.ClientRemoved(client

2799

2152

.dbus_object_path,

2800

2153

client.name)

2801

client_settings.clear()

2802

2154

2803

2155

atexit.register(cleanup)

2804

2156

2805

for client in tcp_server.clients.itervalues():

2157

for client in tcp_server.clients:

2806

2158

if use_dbus:

2807

2159

# Emit D-Bus signal

2808

2160

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2809

# Need to initiate checking of clients

2810

if client.enabled:

2811

client.init_checker()

2161

client.enable()

2812

2162

2813

2163

tcp_server.enable()

2814

2164

tcp_server.server_activate()

2817

2167

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

2818

2168

if use_ipv6:

2819

2169

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

2820

" flowinfo %d, scope_id %d",

2821

*tcp_server.socket.getsockname())

2170

" flowinfo %d, scope_id %d"

2171

% tcp_server.socket.getsockname())

2822

2172

else: # IPv4

2823

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

2824

*tcp_server.socket.getsockname())

2173

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

2174

% tcp_server.socket.getsockname())

2825

2175

2826

2176

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

2827

2177

2830

2180

try:

2831

2181

service.activate()

2832

2182

except dbus.exceptions.DBusException as error:

2833

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

2183

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

2834

2184

cleanup()

2835

2185

sys.exit(1)

2836

2186

# End of Avahi example code

2843

2193

logger.debug("Starting main loop")

2844

2194

main_loop.run()

2845

2195

except AvahiError as error:

2846

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

2196

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

2847

2197

cleanup()

2848

2198

sys.exit(1)

2849

2199

except KeyboardInterrupt:

2854

2204

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

2855

2205

cleanup()

2856

2206

2207

2857

2208

if __name__ == '__main__':

2858

2209

main()