/mandos/release : revision 237.7.174

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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 = "1.3.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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version = "1.6.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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

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

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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("DBusException: %s", error)

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self .entry_group_state_changed))

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'StateChanged', self.entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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

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.format(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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dbus.exceptions.DBusException):

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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

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def _timedelta_to_milliseconds(td):

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_enabled: datetime.datetime(); (UTC)

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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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", "fingerprint",

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

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

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

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"last_approval_request", "last_checked_ok",

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.timeout)

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return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.extended_timeout)

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return timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.interval)

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return timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return _timedelta_to_milliseconds(self.approval_delay)

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

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

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

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attribute."""

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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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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self.name = name

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if config is None:

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config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

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

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if "secret" in config:

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

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elif "secfile" in config:

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

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(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

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

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self.created = datetime.datetime.utcnow()

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self.enabled = 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

548

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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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

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

557

self.approved = None

380

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self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

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560

.Condition(multiprocessing_manager

387

561

.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")

566

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

568

lambda obj:

569

isinstance(obj,

570

property)):

571

if not name.startswith("_"):

572

self.client_structure.append(name)

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# Send notice to process children that client state has changed

389

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def send_changedstate(self):

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

576

with self.changedstate:

577

self.changedstate.notify_all()

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def enable(self):

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

396

581

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

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# Already enabled

398

583

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

600

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

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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):

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614

# 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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self.checker_initiator_tag = (gobject.timeout_add

403

619

(self.interval_milliseconds(),

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self.start_checker))

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

406

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

622

if self.disable_initiator_tag is not None:

623

gobject.source_remove(self.disable_initiator_tag)

407

624

self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

410

self.enabled = True

411

self.last_enabled = datetime.datetime.utcnow()

412

627

# Also start a new checker *right now*.

413

628

self.start_checker()

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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

441

630

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

442

631

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

443

632

self.checker_callback_tag = None

444

633

self.checker = None

445

634

if os.WIFEXITED(condition):

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

635

self.last_checker_status = os.WEXITSTATUS(condition)

636

if self.last_checker_status == 0:

448

637

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

449

638

vars(self))

450

639

self.checked_ok()

452

641

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

453

642

vars(self))

454

643

else:

644

self.last_checker_status = -1

455

645

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

456

646

vars(self))

457

647

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

"""

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."""

464

656

if timeout is None:

465

657

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

467

gobject.source_remove(self.disable_initiator_tag)

468

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

469

self.disable_initiator_tag = (gobject.timeout_add

470

(_timedelta_to_milliseconds

471

(timeout), self.disable))

658

if self.disable_initiator_tag is not None:

659

gobject.source_remove(self.disable_initiator_tag)

660

self.disable_initiator_tag = None

661

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

662

self.disable_initiator_tag = (gobject.timeout_add

663

(timedelta_to_milliseconds

664

(timeout), self.disable))

665

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

472

666

473

667

def need_approval(self):

474

668

self.last_approval_request = datetime.datetime.utcnow()

479

673

If a checker already exists, leave it running and do

480

674

nothing."""

481

675

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

482

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

483

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

484

# client would inevitably timeout, since no checker would get

485

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

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

486

680

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

487

681

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

488

682

# should be.

502

696

self.current_checker_command)

503

697

# Start a new checker if needed

504

698

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)

505

704

try:

506

# In case checker_command has exactly one % operator

507

command = self.checker_command % self.host

508

except TypeError:

509

# Escape attributes for the shell

510

escaped_attrs = dict(

511

(attr,

512

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

513

errors=

514

'replace')))

515

for attr in

516

self.runtime_expansions)

517

518

try:

519

command = self.checker_command % escaped_attrs

520

except TypeError as error:

521

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

522

' %s', self.checker_command, error)

523

return True # Try again later

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

524

710

self.current_checker_command = command

525

711

try:

526

712

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

529

715

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

530

716

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

531

717

# 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 })

532

726

self.checker = subprocess.Popen(command,

533

727

close_fds=True,

534

shell=True, cwd="/")

535

self.checker_callback_tag = (gobject.child_watch_add

536

(self.checker.pid,

537

self.checker_callback,

538

data=command))

539

# The checker may have completed before the gobject

540

# watch was added. Check for this.

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:

541

741

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

542

if pid:

543

gobject.source_remove(self.checker_callback_tag)

544

self.checker_callback(pid, status, command)

545

742

except OSError as error:

546

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

547

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

752

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

549

753

return True

550

754

557

761

return

558

762

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

559

763

try:

560

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

764

self.checker.terminate()

561

765

#time.sleep(0.5)

562

766

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

563

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

767

# self.checker.kill()

564

768

except OSError as error:

565

769

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

566

770

raise

583

787

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

584

788

if byte_arrays and signature != "ay":

585

789

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

586

" signature %r" % signature)

790

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

587

791

def decorator(func):

588

792

func._dbus_is_property = True

589

793

func._dbus_interface = dbus_interface

597

801

return decorator

598

802

599

803

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

600

841

class DBusPropertyException(dbus.exceptions.DBusException):

601

842

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

602

843

"""

625

866

"""

626

867

627

868

@staticmethod

628

def _is_dbus_property(obj):

629

return getattr(obj, "_dbus_is_property", False)

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

877

631

def _get_all_dbus_properties(self):

878

def _get_all_dbus_things(self, thing):

632

879

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

633

880

"""

634

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

881

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

882

name),

883

athing.__get__(self))

635

884

for cls in self.__class__.__mro__

636

for name, prop in

637

inspect.getmembers(cls, self._is_dbus_property))

885

for name, athing in

886

inspect.getmembers(cls,

887

self._is_dbus_thing(thing)))

638

888

639

889

def _get_dbus_property(self, interface_name, property_name):

640

890

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

642

892

"""

643

893

for cls in self.__class__.__mro__:

644

894

for name, value in (inspect.getmembers

645

(cls, self._is_dbus_property)):

895

(cls,

896

self._is_dbus_thing("property"))):

646

897

if (value._dbus_name == property_name

647

898

and value._dbus_interface == interface_name):

648

899

return value.__get__(self)

677

928

# signatures other than "ay".

678

929

if prop._dbus_signature != "ay":

679

930

raise ValueError

680

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

681

for byte in value))

931

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

932

for byte in value))

682

933

prop(value)

683

934

684

935

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

689

940

690

941

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

691

942

"""

692

all = {}

693

for name, prop in self._get_all_dbus_properties():

943

properties = {}

944

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

694

945

if (interface_name

695

946

and interface_name != prop._dbus_interface):

696

947

# Interface non-empty but did not match

700

951

continue

701

952

value = prop()

702

953

if not hasattr(value, "variant_level"):

703

all[name] = value

954

properties[name] = value

704

955

continue

705

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

706

value.variant_level+1)

707

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

956

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

957

value.variant_level+1)

958

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

708

959

709

960

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

710

961

out_signature="s",

711

962

path_keyword='object_path',

712

963

connection_keyword='connection')

713

964

def Introspect(self, object_path, connection):

714

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

965

"""Overloading of standard D-Bus method.

966

967

Inserts property tags and interface annotation tags.

715

968

"""

716

969

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

717

970

connection)

724

977

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

725

978

return e

726

979

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

980

# Add property tags

727

981

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

728

982

for name, prop

729

in self._get_all_dbus_properties()

983

in self._get_all_dbus_things("property")

730

984

if prop._dbus_interface

731

985

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

732

986

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)

733

1018

# Add the names to the return values for the

734

1019

# "org.freedesktop.DBus.Properties" methods

735

1020

if (if_tag.getAttribute("name")

750

1035

except (AttributeError, xml.dom.DOMException,

751

1036

xml.parsers.expat.ExpatError) as error:

752

1037

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

753

error)

1038

exc_info=error)

754

1039

return xmlstring

755

1040

756

1041

757

def datetime_to_dbus (dt, variant_level=0):

1042

def datetime_to_dbus(dt, variant_level=0):

758

1043

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

759

1044

if dt is None:

760

1045

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

761

1046

return dbus.String(dt.isoformat(),

762

1047

variant_level=variant_level)

763

1048

764

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

765

.__metaclass__):

766

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

767

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

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).

768

1072

"""

769

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

770

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

771

# methods, signals, or properties in them

772

for base in (b for b in bases

773

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

774

# Go though all attributes of the base class

775

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

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):

776

1080

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

777

1081

# with the wrong interface name

778

1082

if (not hasattr(attribute, "_dbus_interface")

779

1083

or not attribute._dbus_interface

780

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

1084

.startswith(orig_interface_name)):

781

1085

continue

782

1086

# Create an alternate D-Bus interface name based on

783

1087

# the current name

784

1088

alt_interface = (attribute._dbus_interface

785

.replace("se.recompile.Mandos",

786

"se.bsnet.fukt.Mandos"))

1089

.replace(orig_interface_name,

1090

alt_interface_name))

1091

interface_names.add(alt_interface)

787

1092

# Is this a D-Bus signal?

788

1093

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

789

# Extract the original non-method function by

790

# black magic

1094

# Extract the original non-method undecorated

1095

# function by black magic

791

1096

nonmethod_func = (dict(

792

1097

zip(attribute.func_code.co_freevars,

793

1098

attribute.__closure__))["func"]

804

1109

nonmethod_func.func_name,

805

1110

nonmethod_func.func_defaults,

806

1111

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

807

1118

# Define a creator of a function to call both the

808

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

809

# signals gets sent when the function is called

1119

# original and alternate functions, so both the

1120

# original and alternate signals gets sent when

1121

# the function is called

810

1122

def fixscope(func1, func2):

811

1123

"""This function is a scope container to pass

812

1124

func1 and func2 to the "call_both" function

819

1131

return call_both

820

1132

# Create the "call_both" function and add it to

821

1133

# the class

822

attr[attrname] = fixscope(attribute,

823

new_function)

1134

attr[attrname] = fixscope(attribute, new_function)

824

1135

# Is this a D-Bus method?

825

1136

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

826

1137

# Create a new, but exactly alike, function

837

1148

attribute.func_name,

838

1149

attribute.func_defaults,

839

1150

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

840

1157

# Is this a D-Bus property?

841

1158

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

842

1159

# Create a new, but exactly alike, function

856

1173

attribute.func_name,

857

1174

attribute.func_defaults,

858

1175

attribute.func_closure)))

859

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

860

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

1221

class ClientDBus(Client, DBusObjectWithProperties):

862

1222

"""A Client class using D-Bus

863

1223

872

1232

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

873

1233

874

1234

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

875

self._approvals_pending = 0

876

1235

self.bus = bus

877

1236

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

878

1237

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

884

1243

("/clients/" + client_object_name))

885

1244

DBusObjectWithProperties.__init__(self, self.bus,

886

1245

self.dbus_object_path)

887

1246

888

1247

def notifychangeproperty(transform_func,

889

1248

dbus_name, type_func=lambda x: x,

890

1249

variant_level=1):

891

1250

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

892

1251

its changes to DBus.

893

894

transform_fun: Function that takes a value and transforms it

895

to a D-Bus type.

1252

1253

transform_fun: Function that takes a value and a variant_level

1254

and transforms it to a D-Bus type.

896

1255

dbus_name: D-Bus name of the variable

897

1256

type_func: Function that transform the value before sending it

898

1257

to the D-Bus. Default: no transform

899

1258

variant_level: D-Bus variant level. Default: 1

900

1259

"""

901

real_value = [None,]

1260

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

902

1261

def setter(self, value):

903

old_value = real_value[0]

904

real_value[0] = value

905

1262

if hasattr(self, "dbus_object_path"):

906

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

907

dbus_value = transform_func(type_func

908

(real_value[0]),

909

variant_level)

1263

if (not hasattr(self, attrname) or

1264

type_func(getattr(self, attrname, None))

1265

!= type_func(value)):

1266

dbus_value = transform_func(type_func(value),

1267

variant_level

1268

=variant_level)

910

1269

self.PropertyChanged(dbus.String(dbus_name),

911

1270

dbus_value)

1271

setattr(self, attrname, value)

912

1272

913

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

914

1273

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

915

1274

916

1275

expires = notifychangeproperty(datetime_to_dbus, "Expires")

917

1276

approvals_pending = notifychangeproperty(dbus.Boolean,

925

1284

checker is not None)

926

1285

last_checked_ok = notifychangeproperty(datetime_to_dbus,

927

1286

"LastCheckedOK")

1287

last_checker_status = notifychangeproperty(dbus.Int16,

1288

"LastCheckerStatus")

928

1289

last_approval_request = notifychangeproperty(

929

1290

datetime_to_dbus, "LastApprovalRequest")

930

1291

approved_by_default = notifychangeproperty(dbus.Boolean,

931

1292

"ApprovedByDefault")

932

approval_delay = notifychangeproperty(dbus.UInt16,

1293

approval_delay = notifychangeproperty(dbus.UInt64,

933

1294

"ApprovalDelay",

934

1295

type_func =

935

_timedelta_to_milliseconds)

1296

timedelta_to_milliseconds)

936

1297

approval_duration = notifychangeproperty(

937

dbus.UInt16, "ApprovalDuration",

938

type_func = _timedelta_to_milliseconds)

1298

dbus.UInt64, "ApprovalDuration",

1299

type_func = timedelta_to_milliseconds)

939

1300

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

940

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

1301

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

941

1302

type_func =

942

_timedelta_to_milliseconds)

1303

timedelta_to_milliseconds)

943

1304

extended_timeout = notifychangeproperty(

944

dbus.UInt16, "ExtendedTimeout",

945

type_func = _timedelta_to_milliseconds)

946

interval = notifychangeproperty(dbus.UInt16,

1305

dbus.UInt64, "ExtendedTimeout",

1306

type_func = timedelta_to_milliseconds)

1307

interval = notifychangeproperty(dbus.UInt64,

947

1308

"Interval",

948

1309

type_func =

949

_timedelta_to_milliseconds)

1310

timedelta_to_milliseconds)

950

1311

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

951

1312

952

1313

del notifychangeproperty

994

1355

return r

995

1356

996

1357

def _reset_approved(self):

997

self._approved = None

1358

self.approved = None

998

1359

return False

999

1360

1000

1361

def approve(self, value=True):

1001

self.send_changedstate()

1002

self._approved = value

1003

gobject.timeout_add(_timedelta_to_milliseconds

1362

self.approved = value

1363

gobject.timeout_add(timedelta_to_milliseconds

1004

1364

(self.approval_duration),

1005

1365

self._reset_approved)

1006

1366

self.send_changedstate()

1007

1367

1008

1368

## D-Bus methods, signals & properties

1009

1369

_interface = "se.recompile.Mandos.Client"

1010

1370

1371

## Interfaces

1372

1373

@dbus_interface_annotations(_interface)

1374

def _foo(self):

1375

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

1376

"false"}

1377

1011

1378

## Signals

1012

1379

1013

1380

# CheckerCompleted - signal

1112

1479

access="readwrite")

1113

1480

def ApprovalDuration_dbus_property(self, value=None):

1114

1481

if value is None: # get

1115

return dbus.UInt64(_timedelta_to_milliseconds(

1482

return dbus.UInt64(timedelta_to_milliseconds(

1116

1483

self.approval_duration))

1117

1484

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

1118

1485

1132

1499

def Host_dbus_property(self, value=None):

1133

1500

if value is None: # get

1134

1501

return dbus.String(self.host)

1135

self.host = value

1502

self.host = unicode(value)

1136

1503

1137

1504

# Created - property

1138

1505

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

1139

1506

def Created_dbus_property(self):

1140

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

1507

return datetime_to_dbus(self.created)

1141

1508

1142

1509

# LastEnabled - property

1143

1510

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

1164

1531

return

1165

1532

return datetime_to_dbus(self.last_checked_ok)

1166

1533

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

1167

1540

# Expires - property

1168

1541

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

1169

1542

def Expires_dbus_property(self):

1180

1553

def Timeout_dbus_property(self, value=None):

1181

1554

if value is None: # get

1182

1555

return dbus.UInt64(self.timeout_milliseconds())

1556

old_timeout = self.timeout

1183

1557

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

1184

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

1185

return

1186

# Reschedule timeout

1187

gobject.source_remove(self.disable_initiator_tag)

1188

self.disable_initiator_tag = None

1189

self.expires = None

1190

time_to_die = (self.

1191

_timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow()))

1196

if time_to_die <= 0:

1197

# The timeout has passed

1198

self.disable()

1199

else:

1200

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

1201

+ datetime.timedelta(milliseconds =

1202

time_to_die))

1203

self.disable_initiator_tag = (gobject.timeout_add

1204

(time_to_die, self.disable))

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))

1205

1574

1206

1575

# ExtendedTimeout - property

1207

1576

@dbus_service_property(_interface, signature="t",

1220

1589

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

1221

1590

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

1222

1591

return

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

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

1228

1598

1229

1599

# Checker - property

1230

1600

@dbus_service_property(_interface, signature="s",

1232

1602

def Checker_dbus_property(self, value=None):

1233

1603

if value is None: # get

1234

1604

return dbus.String(self.checker_command)

1235

self.checker_command = value

1605

self.checker_command = unicode(value)

1236

1606

1237

1607

# CheckerRunning - property

1238

1608

@dbus_service_property(_interface, signature="b",

1267

1637

raise KeyError()

1268

1638

1269

1639

def __getattribute__(self, name):

1270

if(name == '_pipe'):

1640

if name == '_pipe':

1271

1641

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

1272

1642

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

1273

1643

data = self._pipe.recv()

1280

1650

return func

1281

1651

1282

1652

def __setattr__(self, name, value):

1283

if(name == '_pipe'):

1653

if name == '_pipe':

1284

1654

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

1285

1655

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

1286

1656

1287

class ClientDBusTransitional(ClientDBus):

1288

__metaclass__ = AlternateDBusNamesMetaclass

1289

1657

1290

1658

class ClientHandler(socketserver.BaseRequestHandler, object):

1291

1659

"""A class to handle client connections.

1374

1742

client.Rejected("Disabled")

1375

1743

return

1376

1744

1377

if client._approved or not client.approval_delay:

1745

if client.approved or not client.approval_delay:

1378

1746

#We are approved or approval is disabled

1379

1747

break

1380

elif client._approved is None:

1748

elif client.approved is None:

1381

1749

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

1382

1750

client.name)

1383

1751

if self.server.use_dbus:

1394

1762

return

1395

1763

1396

1764

#wait until timeout or approved

1397

#x = float(client

1398

# ._timedelta_to_milliseconds(delay))

1399

1765

time = datetime.datetime.now()

1400

1766

client.changedstate.acquire()

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1767

client.changedstate.wait(

1768

float(timedelta_to_milliseconds(delay)

1769

/ 1000))

1404

1770

client.changedstate.release()

1405

1771

time2 = datetime.datetime.now()

1406

1772

if (time2 - time) >= delay:

1422

1788

try:

1423

1789

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

1424

1790

except gnutls.errors.GNUTLSError as error:

1425

logger.warning("gnutls send failed")

1791

logger.warning("gnutls send failed",

1792

exc_info=error)

1426

1793

return

1427

1794

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

1428

1795

sent, len(client.secret)

1430

1797

sent_size += sent

1431

1798

1432

1799

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

1433

# bump the timeout as if seen

1434

client.checked_ok(client.extended_timeout)

1800

# bump the timeout using extended_timeout

1801

client.bump_timeout(client.extended_timeout)

1435

1802

if self.server.use_dbus:

1436

1803

# Emit D-Bus signal

1437

1804

client.GotSecret()

1442

1809

try:

1443

1810

session.bye()

1444

1811

except gnutls.errors.GNUTLSError as error:

1445

logger.warning("GnuTLS bye failed")

1812

logger.warning("GnuTLS bye failed",

1813

exc_info=error)

1446

1814

1447

1815

@staticmethod

1448

1816

def peer_certificate(session):

1504

1872

# Convert the buffer to a Python bytestring

1505

1873

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

1506

1874

# Convert the bytestring to hexadecimal notation

1507

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

1875

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

1508

1876

return hex_fpr

1509

1877

1510

1878

1513

1881

def sub_process_main(self, request, address):

1514

1882

try:

1515

1883

self.finish_request(request, address)

1516

except:

1884

except Exception:

1517

1885

self.handle_error(request, address)

1518

1886

self.close_request(request)

1519

1887

1520

1888

def process_request(self, request, address):

1521

1889

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

1522

multiprocessing.Process(target = self.sub_process_main,

1523

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

1890

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

1891

args = (request, address))

1892

proc.start()

1893

return proc

1524

1894

1525

1895

1526

1896

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1532

1902

"""

1533

1903

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1534

1904

1535

super(MultiprocessingMixInWithPipe,

1536

self).process_request(request, client_address)

1905

proc = MultiprocessingMixIn.process_request(self, request,

1906

client_address)

1537

1907

self.child_pipe.close()

1538

self.add_pipe(parent_pipe)

1908

self.add_pipe(parent_pipe, proc)

1539

1909

1540

def add_pipe(self, parent_pipe):

1910

def add_pipe(self, parent_pipe, proc):

1541

1911

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

1542

1912

raise NotImplementedError

1543

1913

1552

1922

use_ipv6: Boolean; to use IPv6 or not

1553

1923

"""

1554

1924

def __init__(self, server_address, RequestHandlerClass,

1555

interface=None, use_ipv6=True):

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

"""

1556

1929

self.interface = interface

1557

1930

if use_ipv6:

1558

1931

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.

1559

1958

socketserver.TCPServer.__init__(self, server_address,

1560

1959

RequestHandlerClass)

1960

1561

1961

def server_bind(self):

1562

1962

"""This overrides the normal server_bind() function

1563

1963

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

1571

1971

try:

1572

1972

self.socket.setsockopt(socket.SOL_SOCKET,

1573

1973

SO_BINDTODEVICE,

1574

str(self.interface

1575

+ '\0'))

1974

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

1576

1975

except socket.error as error:

1577

if error[0] == errno.EPERM:

1578

logger.error("No permission to"

1579

" bind to interface %s",

1580

self.interface)

1581

elif error[0] == errno.ENOPROTOOPT:

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:

1582

1980

logger.error("SO_BINDTODEVICE not available;"

1583

1981

" cannot bind to interface %s",

1584

1982

self.interface)

1983

elif error.errno == errno.ENODEV:

1984

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

1985

" cannot bind", self.interface)

1585

1986

else:

1586

1987

raise

1587

1988

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

1590

1991

if self.address_family == socket.AF_INET6:

1591

1992

any_address = "::" # in6addr_any

1592

1993

else:

1593

any_address = socket.INADDR_ANY

1994

any_address = "0.0.0.0" # INADDR_ANY

1594

1995

self.server_address = (any_address,

1595

1996

self.server_address[1])

1596

1997

elif not self.server_address[1]:

1617

2018

"""

1618

2019

def __init__(self, server_address, RequestHandlerClass,

1619

2020

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

1620

gnutls_priority=None, use_dbus=True):

2021

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

1621

2022

self.enabled = False

1622

2023

self.clients = clients

1623

2024

if self.clients is None:

1624

self.clients = set()

2025

self.clients = {}

1625

2026

self.use_dbus = use_dbus

1626

2027

self.gnutls_priority = gnutls_priority

1627

2028

IPv6_TCPServer.__init__(self, server_address,

1628

2029

RequestHandlerClass,

1629

2030

interface = interface,

1630

use_ipv6 = use_ipv6)

2031

use_ipv6 = use_ipv6,

2032

socketfd = socketfd)

1631

2033

def server_activate(self):

1632

2034

if self.enabled:

1633

2035

return socketserver.TCPServer.server_activate(self)

2036

1634

2037

def enable(self):

1635

2038

self.enabled = True

1636

def add_pipe(self, parent_pipe):

2039

2040

def add_pipe(self, parent_pipe, proc):

1637

2041

# Call "handle_ipc" for both data and EOF events

1638

2042

gobject.io_add_watch(parent_pipe.fileno(),

1639

2043

gobject.IO_IN | gobject.IO_HUP,

1640

2044

functools.partial(self.handle_ipc,

1641

2045

parent_pipe =

1642

parent_pipe))

1643

2046

parent_pipe,

2047

proc = proc))

2048

1644

2049

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

1645

client_object=None):

1646

condition_names = {

1647

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

1648

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

1649

# blocking).

1650

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

1651

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

1652

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

1653

# broken, usually for pipes and

1654

# sockets).

1655

}

1656

conditions_string = ' | '.join(name

1657

for cond, name in

1658

condition_names.iteritems()

1659

if cond & condition)

1660

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

1661

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

2050

proc = None, client_object=None):

2051

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

2052

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

2053

# Wait for other process to exit

2054

proc.join()

1662

2055

return False

1663

2056

1664

2057

# Read a request from the child

1669

2062

fpr = request[1]

1670

2063

address = request[2]

1671

2064

1672

for c in self.clients:

2065

for c in self.clients.itervalues():

1673

2066

if c.fingerprint == fpr:

1674

2067

client = c

1675

2068

break

1688

2081

functools.partial(self.handle_ipc,

1689

2082

parent_pipe =

1690

2083

parent_pipe,

2084

proc = proc,

1691

2085

client_object =

1692

2086

client))

1693

2087

parent_pipe.send(True)

1719

2113

return True

1720

2114

1721

2115

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

1722

2215

def string_to_delta(interval):

1723

2216

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

1724

2217

1735

2228

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

1736

2229

datetime.timedelta(0, 330)

1737

2230

"""

2231

2232

try:

2233

return rfc3339_duration_to_delta(interval)

2234

except ValueError:

2235

pass

2236

1738

2237

timevalue = datetime.timedelta(0)

1739

2238

for s in interval.split():

1740

2239

try:

1751

2250

elif suffix == "w":

1752

2251

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

1753

2252

else:

1754

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

2253

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

2254

.format(suffix))

1755

2255

except (ValueError, IndexError) as e:

1756

2256

raise ValueError(*(e.args))

1757

2257

timevalue += delta

1758

2258

return timevalue

1759

2259

1760

2260

1761

def if_nametoindex(interface):

1762

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

1763

1764

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

1765

global if_nametoindex

1766

try:

1767

if_nametoindex = (ctypes.cdll.LoadLibrary

1768

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

1769

.if_nametoindex)

1770

except (OSError, AttributeError):

1771

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

1772

def if_nametoindex(interface):

1773

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

1774

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

1775

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

1776

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1777

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

1778

interface))

1779

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

1780

ifreq[16:20])[0]

1781

return interface_index

1782

return if_nametoindex(interface)

1783

1784

1785

2261

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

1786

2262

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

1787

2263

1795

2271

sys.exit()

1796

2272

if not noclose:

1797

2273

# Close all standard open file descriptors

1798

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

2274

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

1799

2275

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

1800

2276

raise OSError(errno.ENODEV,

1801

"%s not a character device"

1802

% os.path.devnull)

2277

"{0} not a character device"

2278

.format(os.devnull))

1803

2279

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

1804

2280

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

1805

2281

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

1814

2290

1815

2291

parser = argparse.ArgumentParser()

1816

2292

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

1817

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

2293

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

1818

2294

help="show version number and exit")

1819

2295

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

1820

2296

help="Bind to interface IF")

1826

2302

help="Run self-test")

1827

2303

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

1828

2304

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

1829

" to terminal")

2305

" to terminal", default=None)

1830

2306

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

1831

2307

help="Debug level for stdout output")

1832

2308

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

1839

2315

" files")

1840

2316

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

1841

2317

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

1842

" system bus interface")

2318

" system bus interface", default=None)

1843

2319

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

1844

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

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

1845

2333

options = parser.parse_args()

1846

2334

1847

2335

if options.check:

1855

2343

"port": "",

1856

2344

"debug": "False",

1857

2345

"priority":

1858

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

2346

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

1859

2347

"servicename": "Mandos",

1860

2348

"use_dbus": "True",

1861

2349

"use_ipv6": "True",

1862

2350

"debuglevel": "",

2351

"restore": "True",

2352

"socket": "",

2353

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

2354

"foreground": "False",

1863

2355

}

1864

2356

1865

2357

# Parse config file for server-global settings

1870

2362

# Convert the SafeConfigParser object to a dict

1871

2363

server_settings = server_config.defaults()

1872

2364

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

1873

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

2365

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

1874

2366

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

1875

2367

option)

1876

2368

if server_settings["port"]:

1877

2369

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

1878

2370

"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"])

1879

2380

del server_config

1880

2381

1881

2382

# Override the settings from the config file with command line

1882

2383

# options, if set.

1883

2384

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

1884

2385

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

1885

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

2386

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

2387

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

1886

2388

value = getattr(options, option)

1887

2389

if value is not None:

1888

2390

server_settings[option] = value

1891

2393

for option in server_settings.keys():

1892

2394

if type(server_settings[option]) is str:

1893

2395

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

1894

2403

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

1895

2404

1896

2405

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

1900

2409

debuglevel = server_settings["debuglevel"]

1901

2410

use_dbus = server_settings["use_dbus"]

1902

2411

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)

1903

2424

1904

2425

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

1905

2426

syslogger.setFormatter(logging.Formatter

1906

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

1907

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

1908

% server_settings["servicename"]))

2427

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

2428

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

2429

.format(server_settings

2430

["servicename"])))

1909

2431

1910

2432

# Parse config file with clients

1911

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

1912

"extended_timeout": "15m",

1913

"interval": "2m",

1914

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

1915

"host": "",

1916

"approval_delay": "0s",

1917

"approval_duration": "1s",

1918

}

1919

client_config = configparser.SafeConfigParser(client_defaults)

2433

client_config = configparser.SafeConfigParser(Client

2434

.client_defaults)

1920

2435

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

1921

2436

"clients.conf"))

1922

2437

1931

2446

use_ipv6=use_ipv6,

1932

2447

gnutls_priority=

1933

2448

server_settings["priority"],

1934

use_dbus=use_dbus)

1935

if not debug:

1936

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

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

1937

2455

try:

1938

2456

pidfile = open(pidfilename, "w")

1939

except IOError:

1940

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

2457

except IOError as e:

2458

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

2459

exc_info=e)

1941

2460

1942

try:

1943

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

1944

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

1945

except KeyError:

2461

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

1946

2462

try:

1947

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

1948

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

2463

uid = pwd.getpwnam(name).pw_uid

2464

gid = pwd.getpwnam(name).pw_gid

2465

break

1949

2466

except KeyError:

1950

try:

1951

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

1952

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

1953

except KeyError:

1954

uid = 65534

1955

gid = 65534

2467

continue

2468

else:

2469

uid = 65534

2470

gid = 65534

1956

2471

try:

1957

2472

os.setgid(gid)

1958

2473

os.setuid(uid)

1959

2474

except OSError as error:

1960

if error[0] != errno.EPERM:

2475

if error.errno != errno.EPERM:

1961

2476

raise error

1962

2477

1963

if not debug and not debuglevel:

1964

syslogger.setLevel(logging.WARNING)

1965

console.setLevel(logging.WARNING)

1966

if debuglevel:

1967

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

1968

syslogger.setLevel(level)

1969

console.setLevel(level)

1970

1971

2478

if debug:

1972

2479

# Enable all possible GnuTLS debugging

1973

2480

1983

2490

.gnutls_global_set_log_function(debug_gnutls))

1984

2491

1985

2492

# Redirect stdin so all checkers get /dev/null

1986

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

2493

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

1987

2494

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

1988

2495

if null > 2:

1989

2496

os.close(null)

1990

else:

1991

# No console logging

1992

logger.removeHandler(console)

1993

2497

1994

2498

# Need to fork before connecting to D-Bus

1995

if not debug:

2499

if not foreground:

1996

2500

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

1997

2501

daemon()

1998

2502

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

1999

2507

global main_loop

2000

2508

# From the Avahi example code

2001

DBusGMainLoop(set_as_default=True )

2509

DBusGMainLoop(set_as_default=True)

2002

2510

main_loop = gobject.MainLoop()

2003

2511

bus = dbus.SystemBus()

2004

2512

# End of Avahi example code

2010

2518

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

2011

2519

do_not_queue=True))

2012

2520

except dbus.exceptions.NameExistsException as e:

2013

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

2521

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

2014

2522

use_dbus = False

2015

2523

server_settings["use_dbus"] = False

2016

2524

tcp_server.use_dbus = False

2017

2525

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2018

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

2019

servicetype = "_mandos._tcp",

2020

protocol = protocol, bus = bus)

2526

service = AvahiServiceToSyslog(name =

2527

server_settings["servicename"],

2528

servicetype = "_mandos._tcp",

2529

protocol = protocol, bus = bus)

2021

2530

if server_settings["interface"]:

2022

2531

service.interface = (if_nametoindex

2023

2532

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

2027

2536

2028

2537

client_class = Client

2029

2538

if use_dbus:

2030

client_class = functools.partial(ClientDBusTransitional,

2031

bus = bus)

2032

def client_config_items(config, section):

2033

special_settings = {

2034

"approved_by_default":

2035

lambda: config.getboolean(section,

2036

"approved_by_default"),

2037

}

2038

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

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

2622

try:

2040

yield (name, special_settings[name]())

2041

except KeyError:

2042

yield (name, value)

2043

2044

tcp_server.clients.update(set(

2045

client_class(name = section,

2046

config= dict(client_config_items(

2047

client_config, section)))

2048

for section in client_config.sections()))

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

2648

if not tcp_server.clients:

2050

2649

logger.warning("No clients defined")

2051

2052

if not debug:

2053

try:

2054

with pidfile:

2055

pid = os.getpid()

2056

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

2057

del pidfile

2058

except IOError:

2059

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

2060

pidfilename, pid)

2061

except NameError:

2062

# "pidfile" was never created

2063

pass

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

2064

2661

del pidfilename

2065

2066

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

2067

2662

2068

2663

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

2069

2664

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

2070

2665

2071

2666

if use_dbus:

2072

class MandosDBusService(dbus.service.Object):

2667

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

2668

"se.bsnet.fukt.Mandos"})

2669

class MandosDBusService(DBusObjectWithProperties):

2073

2670

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

2074

2671

def __init__(self):

2075

2672

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

2076

2673

_interface = "se.recompile.Mandos"

2077

2674

2675

@dbus_interface_annotations(_interface)

2676

def _foo(self):

2677

return { "org.freedesktop.DBus.Property"

2678

".EmitsChangedSignal":

2679

"false"}

2680

2078

2681

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

2079

2682

def ClientAdded(self, objpath):

2080

2683

"D-Bus signal"

2094

2697

def GetAllClients(self):

2095

2698

"D-Bus method"

2096

2699

return dbus.Array(c.dbus_object_path

2097

for c in tcp_server.clients)

2700

for c in

2701

tcp_server.clients.itervalues())

2098

2702

2099

2703

@dbus.service.method(_interface,

2100

2704

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

2102

2706

"D-Bus method"

2103

2707

return dbus.Dictionary(

2104

2708

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

2105

for c in tcp_server.clients),

2709

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

2106

2710

signature="oa{sv}")

2107

2711

2108

2712

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

2109

2713

def RemoveClient(self, object_path):

2110

2714

"D-Bus method"

2111

for c in tcp_server.clients:

2715

for c in tcp_server.clients.itervalues():

2112

2716

if c.dbus_object_path == object_path:

2113

tcp_server.clients.remove(c)

2717

del tcp_server.clients[c.name]

2114

2718

c.remove_from_connection()

2115

2719

# Don't signal anything except ClientRemoved

2116

2720

c.disable(quiet=True)

2121

2725

2122

2726

del _interface

2123

2727

2124

class MandosDBusServiceTransitional(MandosDBusService):

2125

__metaclass__ = AlternateDBusNamesMetaclass

2126

mandos_dbus_service = MandosDBusServiceTransitional()

2728

mandos_dbus_service = MandosDBusService()

2127

2729

2128

2730

def cleanup():

2129

2731

"Cleanup function; run on exit"

2130

2732

service.cleanup()

2131

2733

2734

multiprocessing.active_children()

2735

wnull.close()

2736

if not (tcp_server.clients or client_settings):

2737

return

2738

2739

# Store client before exiting. Secrets are encrypted with key

2740

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

2741

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

2742

clients = {}

2743

with PGPEngine() as pgp:

2744

for client in tcp_server.clients.itervalues():

2745

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

2746

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

2747

key)

2748

client_dict = {}

2749

2750

# A list of attributes that can not be pickled

2751

# + secret.

2752

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

2753

"checker", "server_settings"))

2754

for name, typ in (inspect.getmembers

2755

(dbus.service.Object)):

2756

exclude.add(name)

2757

2758

client_dict["encrypted_secret"] = (client

2759

.encrypted_secret)

2760

for attr in client.client_structure:

2761

if attr not in exclude:

2762

client_dict[attr] = getattr(client, attr)

2763

2764

clients[client.name] = client_dict

2765

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

2766

2767

try:

2768

with (tempfile.NamedTemporaryFile

2769

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

2770

dir=os.path.dirname(stored_state_path),

2771

delete=False)) as stored_state:

2772

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

2773

tempname=stored_state.name

2774

os.rename(tempname, stored_state_path)

2775

except (IOError, OSError) as e:

2776

if not debug:

2777

try:

2778

os.remove(tempname)

2779

except NameError:

2780

pass

2781

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

2782

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

2783

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

2784

else:

2785

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

2786

exc_info=e)

2787

raise e

2788

2789

# Delete all clients, and settings from config

2132

2790

while tcp_server.clients:

2133

client = tcp_server.clients.pop()

2791

name, client = tcp_server.clients.popitem()

2134

2792

if use_dbus:

2135

2793

client.remove_from_connection()

2136

client.disable_hook = None

2137

2794

# Don't signal anything except ClientRemoved

2138

2795

client.disable(quiet=True)

2139

2796

if use_dbus:

2141

2798

mandos_dbus_service.ClientRemoved(client

2142

2799

.dbus_object_path,

2143

2800

client.name)

2801

client_settings.clear()

2144

2802

2145

2803

atexit.register(cleanup)

2146

2804

2147

for client in tcp_server.clients:

2805

for client in tcp_server.clients.itervalues():

2148

2806

if use_dbus:

2149

2807

# Emit D-Bus signal

2150

2808

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2151

client.enable()

2809

# Need to initiate checking of clients

2810

if client.enabled:

2811

client.init_checker()

2152

2812

2153

2813

tcp_server.enable()

2154

2814

tcp_server.server_activate()

2157

2817

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

2158

2818

if use_ipv6:

2159

2819

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

2160

" flowinfo %d, scope_id %d"

2161

% tcp_server.socket.getsockname())

2820

" flowinfo %d, scope_id %d",

2821

*tcp_server.socket.getsockname())

2162

2822

else: # IPv4

2163

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

2164

% tcp_server.socket.getsockname())

2823

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

2824

*tcp_server.socket.getsockname())

2165

2825

2166

2826

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

2167

2827

2170

2830

try:

2171

2831

service.activate()

2172

2832

except dbus.exceptions.DBusException as error:

2173

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

2833

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

2174

2834

cleanup()

2175

2835

sys.exit(1)

2176

2836

# End of Avahi example code

2183

2843

logger.debug("Starting main loop")

2184

2844

main_loop.run()

2185

2845

except AvahiError as error:

2186

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

2846

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

2187

2847

cleanup()

2188

2848

sys.exit(1)

2189

2849

except KeyboardInterrupt:

2194

2854

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

2195

2855

cleanup()

2196

2856

2197

2198

2857

if __name__ == '__main__':

2199

2858

main()