/mandos/trunk : revision 505.1.2

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import dbus

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import dbus.service

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.6.0"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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version = "1.3.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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self.name = unicode(self.server.GetAlternativeServiceName(self.name))

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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return _timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return _timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return _timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

331

return _timedelta_to_milliseconds(self.approval_delay)

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

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

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

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attribute."""

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self.name = name

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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if config is None:

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config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

347

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", "")

358

self.created = datetime.datetime.utcnow()

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self.enabled = False

360

self.last_approval_request = None

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self.last_enabled = None

362

self.last_checked_ok = None

363

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

364

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

365

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

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self.disable_hook = disable_hook

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self.checker = None

549

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self.checker_initiator_tag = None

550

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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

372

self.checker_command = config["checker"]

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self.current_checker_command = None

553

self.approved = None

374

self.last_connect = None

375

self._approved = None

376

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

377

True)

554

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self.approvals_pending = 0

555

self.changedstate = (multiprocessing_manager

556

.Condition(multiprocessing_manager

557

.Lock()))

558

self.client_structure = [attr for attr in

559

self.__dict__.iterkeys()

560

if not attr.startswith("_")]

561

self.client_structure.append("client_structure")

562

563

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

564

lambda obj:

565

isinstance(obj,

566

property)):

567

if not name.startswith("_"):

568

self.client_structure.append(name)

379

self.approval_delay = string_to_delta(

380

config["approval_delay"])

381

self.approval_duration = string_to_delta(

382

config["approval_duration"])

383

self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())

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570

# Send notice to process children that client state has changed

571

385

def send_changedstate(self):

572

with self.changedstate:

573

self.changedstate.notify_all()

574

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self.changedstate.acquire()

387

self.changedstate.notify_all()

388

self.changedstate.release()

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def enable(self):

576

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

577

392

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

578

393

# Already enabled

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return

395

self.send_changedstate()

396

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

397

# and every interval from then on.

398

self.checker_initiator_tag = (gobject.timeout_add

399

(self.interval_milliseconds(),

400

self.start_checker))

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

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

403

self.disable_initiator_tag = (gobject.timeout_add

404

(self.timeout_milliseconds(),

405

self.disable))

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self.enabled = True

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407

self.last_enabled = datetime.datetime.utcnow()

583

self.init_checker()

584

self.send_changedstate()

408

# Also start a new checker *right now*.

409

self.start_checker()

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def disable(self, quiet=True):

587

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"""Disable this client."""

588

413

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

589

414

return False

590

415

if not quiet:

416

self.send_changedstate()

417

if not quiet:

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

592

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

419

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

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420

gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

595

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self.expires = None

596

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

423

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

597

424

gobject.source_remove(self.checker_initiator_tag)

598

425

self.checker_initiator_tag = None

599

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self.stop_checker()

427

if self.disable_hook:

428

self.disable_hook(self)

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self.enabled = False

601

if not quiet:

602

self.send_changedstate()

603

430

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

604

431

return False

605

432

606

433

def __del__(self):

434

self.disable_hook = None

607

435

self.disable()

608

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def init_checker(self):

610

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

611

# and every interval from then on.

612

if self.checker_initiator_tag is not None:

613

gobject.source_remove(self.checker_initiator_tag)

614

self.checker_initiator_tag = (gobject.timeout_add

615

(self.interval_milliseconds(),

616

self.start_checker))

617

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

618

if self.disable_initiator_tag is not None:

619

gobject.source_remove(self.disable_initiator_tag)

620

self.disable_initiator_tag = (gobject.timeout_add

621

(self.timeout_milliseconds(),

622

self.disable))

623

# Also start a new checker *right now*.

624

self.start_checker()

625

626

437

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

627

438

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

628

439

self.checker_callback_tag = None

629

440

self.checker = None

630

441

if os.WIFEXITED(condition):

631

self.last_checker_status = os.WEXITSTATUS(condition)

632

if self.last_checker_status == 0:

442

exitstatus = os.WEXITSTATUS(condition)

443

if exitstatus == 0:

633

444

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

634

445

vars(self))

635

446

self.checked_ok()

637

448

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

638

449

vars(self))

639

450

else:

640

self.last_checker_status = -1

641

451

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

642

452

vars(self))

643

453

644

def checked_ok(self):

645

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

646

self.last_checked_ok = datetime.datetime.utcnow()

647

self.last_checker_status = 0

648

self.bump_timeout()

649

650

def bump_timeout(self, timeout=None):

651

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

454

def checked_ok(self, timeout=None):

455

"""Bump up the timeout for this client.

456

457

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

458

alive and well.

459

"""

652

460

if timeout is None:

653

461

timeout = self.timeout

654

if self.disable_initiator_tag is not None:

655

gobject.source_remove(self.disable_initiator_tag)

656

self.disable_initiator_tag = None

657

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

658

self.disable_initiator_tag = (gobject.timeout_add

659

(timedelta_to_milliseconds

660

(timeout), self.disable))

661

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

462

self.last_checked_ok = datetime.datetime.utcnow()

463

gobject.source_remove(self.disable_initiator_tag)

464

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

465

self.disable_initiator_tag = (gobject.timeout_add

466

(_timedelta_to_milliseconds(timeout),

467

self.disable))

662

468

663

469

def need_approval(self):

664

470

self.last_approval_request = datetime.datetime.utcnow()

669

475

If a checker already exists, leave it running and do

670

476

nothing."""

671

477

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

672

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

673

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

674

# would inevitably timeout, since no checker would get a

675

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

478

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

479

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

480

# client would inevitably timeout, since no checker would get

481

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

676

482

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

677

483

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

678

484

# should be.

692

498

self.current_checker_command)

693

499

# Start a new checker if needed

694

500

if self.checker is None:

695

# Escape attributes for the shell

696

escaped_attrs = dict(

697

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

698

for attr in

699

self.runtime_expansions)

700

501

try:

701

command = self.checker_command % escaped_attrs

702

except TypeError as error:

703

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

704

self.checker_command, exc_info=error)

705

return True # Try again later

502

# In case checker_command has exactly one % operator

503

command = self.checker_command % self.host

504

except TypeError:

505

# Escape attributes for the shell

506

escaped_attrs = dict(

507

(attr,

508

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

509

errors=

510

'replace')))

511

for attr in

512

self.runtime_expansions)

513

514

try:

515

command = self.checker_command % escaped_attrs

516

except TypeError as error:

517

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

518

' %s', self.checker_command, error)

519

return True # Try again later

706

520

self.current_checker_command = command

707

521

try:

708

522

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

714

528

self.checker = subprocess.Popen(command,

715

529

close_fds=True,

716

530

shell=True, cwd="/")

717

except OSError as error:

718

logger.error("Failed to start subprocess",

719

exc_info=error)

720

return True

721

self.checker_callback_tag = (gobject.child_watch_add

722

(self.checker.pid,

723

self.checker_callback,

724

data=command))

725

# The checker may have completed before the gobject

726

# watch was added. Check for this.

727

try:

531

self.checker_callback_tag = (gobject.child_watch_add

532

(self.checker.pid,

533

self.checker_callback,

534

data=command))

535

# The checker may have completed before the gobject

536

# watch was added. Check for this.

728

537

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

538

if pid:

539

gobject.source_remove(self.checker_callback_tag)

540

self.checker_callback(pid, status, command)

729

541

except OSError as error:

730

if error.errno == errno.ECHILD:

731

# This should never happen

732

logger.error("Child process vanished",

733

exc_info=error)

734

return True

735

raise

736

if pid:

737

gobject.source_remove(self.checker_callback_tag)

738

self.checker_callback(pid, status, command)

542

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

543

error)

739

544

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

740

545

return True

741

546

748

553

return

749

554

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

750

555

try:

751

self.checker.terminate()

556

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

752

557

#time.sleep(0.5)

753

558

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

754

# self.checker.kill()

559

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

755

560

except OSError as error:

756

561

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

757

562

raise

774

579

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

775

580

if byte_arrays and signature != "ay":

776

581

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

777

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

582

" signature %r" % signature)

778

583

def decorator(func):

779

584

func._dbus_is_property = True

780

585

func._dbus_interface = dbus_interface

788

593

return decorator

789

594

790

595

791

def dbus_interface_annotations(dbus_interface):

792

"""Decorator for marking functions returning interface annotations

793

794

Usage:

795

796

@dbus_interface_annotations("org.example.Interface")

797

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

798

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

799

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

800

"false"}

801

"""

802

def decorator(func):

803

func._dbus_is_interface = True

804

func._dbus_interface = dbus_interface

805

func._dbus_name = dbus_interface

806

return func

807

return decorator

808

809

810

def dbus_annotations(annotations):

811

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

812

Usage:

813

814

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

815

access="r")

816

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

817

"org.freedesktop.DBus.Property."

818

"EmitsChangedSignal": "false"})

819

def Property_dbus_property(self):

820

return dbus.Boolean(False)

821

"""

822

def decorator(func):

823

func._dbus_annotations = annotations

824

return func

825

return decorator

826

827

828

596

class DBusPropertyException(dbus.exceptions.DBusException):

829

597

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

830

598

"""

853

621

"""

854

622

855

623

@staticmethod

856

def _is_dbus_thing(thing):

857

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

858

859

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

860

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

861

"""

862

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

863

False)

624

def _is_dbus_property(obj):

625

return getattr(obj, "_dbus_is_property", False)

864

626

865

def _get_all_dbus_things(self, thing):

627

def _get_all_dbus_properties(self):

866

628

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

867

629

"""

868

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

869

name),

870

athing.__get__(self))

630

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

871

631

for cls in self.__class__.__mro__

872

for name, athing in

873

inspect.getmembers(cls,

874

self._is_dbus_thing(thing)))

632

for name, prop in inspect.getmembers(cls, self._is_dbus_property))

875

633

876

634

def _get_dbus_property(self, interface_name, property_name):

877

635

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

878

636

property with the specified name and interface.

879

637

"""

880

638

for cls in self.__class__.__mro__:

881

for name, value in (inspect.getmembers

882

(cls,

883

self._is_dbus_thing("property"))):

884

if (value._dbus_name == property_name

885

and value._dbus_interface == interface_name):

639

for name, value in inspect.getmembers(cls, self._is_dbus_property):

640

if value._dbus_name == property_name and value._dbus_interface == interface_name:

886

641

return value.__get__(self)

887

642

888

643

# No such property

915

670

# signatures other than "ay".

916

671

if prop._dbus_signature != "ay":

917

672

raise ValueError

918

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

919

for byte in value))

673

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

674

for byte in value))

920

675

prop(value)

921

676

922

677

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

927

682

928

683

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

929

684

"""

930

properties = {}

931

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

685

all = {}

686

for name, prop in self._get_all_dbus_properties():

932

687

if (interface_name

933

688

and interface_name != prop._dbus_interface):

934

689

# Interface non-empty but did not match

938

693

continue

939

694

value = prop()

940

695

if not hasattr(value, "variant_level"):

941

properties[name] = value

696

all[name] = value

942

697

continue

943

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

944

value.variant_level+1)

945

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

698

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

699

value.variant_level+1)

700

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

946

701

947

702

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

948

703

out_signature="s",

949

704

path_keyword='object_path',

950

705

connection_keyword='connection')

951

706

def Introspect(self, object_path, connection):

952

"""Overloading of standard D-Bus method.

953

954

Inserts property tags and interface annotation tags.

707

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

955

708

"""

956

709

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

957

710

connection)

964

717

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

965

718

return e

966

719

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

967

# Add property tags

968

720

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

969

721

for name, prop

970

in self._get_all_dbus_things("property")

722

in self._get_all_dbus_properties()

971

723

if prop._dbus_interface

972

724

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

973

725

if_tag.appendChild(tag)

974

# Add annotation tags

975

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

976

for tag in if_tag.getElementsByTagName(typ):

977

annots = dict()

978

for name, prop in (self.

979

_get_all_dbus_things(typ)):

980

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

981

and prop._dbus_interface

982

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

983

annots.update(getattr

984

(prop,

985

"_dbus_annotations",

986

{}))

987

for name, value in annots.iteritems():

988

ann_tag = document.createElement(

989

"annotation")

990

ann_tag.setAttribute("name", name)

991

ann_tag.setAttribute("value", value)

992

tag.appendChild(ann_tag)

993

# Add interface annotation tags

994

for annotation, value in dict(

995

itertools.chain.from_iterable(

996

annotations().iteritems()

997

for name, annotations in

998

self._get_all_dbus_things("interface")

999

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

1000

)).iteritems():

1001

ann_tag = document.createElement("annotation")

1002

ann_tag.setAttribute("name", annotation)

1003

ann_tag.setAttribute("value", value)

1004

if_tag.appendChild(ann_tag)

1005

726

# Add the names to the return values for the

1006

727

# "org.freedesktop.DBus.Properties" methods

1007

728

if (if_tag.getAttribute("name")

1022

743

except (AttributeError, xml.dom.DOMException,

1023

744

xml.parsers.expat.ExpatError) as error:

1024

745

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

1025

exc_info=error)

746

error)

1026

747

return xmlstring

1027

748

1028

749

1029

def datetime_to_dbus(dt, variant_level=0):

750

def datetime_to_dbus (dt, variant_level=0):

1030

751

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

1031

752

if dt is None:

1032

753

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

1033

754

return dbus.String(dt.isoformat(),

1034

755

variant_level=variant_level)

1035

756

1036

1037

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1038

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

1039

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

1040

interface names according to the "alt_interface_names" mapping.

1041

Usage:

1042

1043

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

1044

"net.example.AlternateInterface"})

1045

class SampleDBusObject(dbus.service.Object):

1046

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

1047

def SampleDBusMethod():

1048

pass

1049

1050

The above "SampleDBusMethod" on "SampleDBusObject" will be

1051

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

1052

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

1053

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

1054

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

1055

1056

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

1057

(from DBusObjectWithProperties) and interfaces (from the

1058

dbus_interface_annotations decorator).

757

class AlternateDBusNamesMetaclass(DBusObjectWithProperties.__metaclass__):

758

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

759

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

1059

760

"""

1060

def wrapper(cls):

1061

for orig_interface_name, alt_interface_name in (

1062

alt_interface_names.iteritems()):

1063

attr = {}

1064

interface_names = set()

1065

# Go though all attributes of the class

1066

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

761

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

762

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

763

# methods, signals, or properties in them

764

for base in (b for b in bases

765

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

766

# Go though all attributes of the base class

767

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

1067

768

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

1068

769

# with the wrong interface name

1069

770

if (not hasattr(attribute, "_dbus_interface")

1070

771

or not attribute._dbus_interface

1071

.startswith(orig_interface_name)):

772

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

1072

773

continue

1073

774

# Create an alternate D-Bus interface name based on

1074

775

# the current name

1075

776

alt_interface = (attribute._dbus_interface

1076

.replace(orig_interface_name,

1077

alt_interface_name))

1078

interface_names.add(alt_interface)

777

.replace("se.recompile.Mandos",

778

"se.bsnet.fukt.Mandos"))

1079

779

# Is this a D-Bus signal?

1080

780

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

1081

# Extract the original non-method undecorated

1082

# function by black magic

781

# Extract the original non-method function by

782

# black magic

1083

783

nonmethod_func = (dict(

1084

784

zip(attribute.func_code.co_freevars,

1085

785

attribute.__closure__))["func"]

1096

796

nonmethod_func.func_name,

1097

797

nonmethod_func.func_defaults,

1098

798

nonmethod_func.func_closure)))

1099

# Copy annotations, if any

1100

try:

1101

new_function._dbus_annotations = (

1102

dict(attribute._dbus_annotations))

1103

except AttributeError:

1104

pass

1105

799

# Define a creator of a function to call both the

1106

# original and alternate functions, so both the

1107

# original and alternate signals gets sent when

1108

# the function is called

800

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

801

# signals gets sent when the function is called

1109

802

def fixscope(func1, func2):

1110

803

"""This function is a scope container to pass

1111

804

func1 and func2 to the "call_both" function

1118

811

return call_both

1119

812

# Create the "call_both" function and add it to

1120

813

# the class

1121

attr[attrname] = fixscope(attribute, new_function)

814

attr[attrname] = fixscope(attribute,

815

new_function)

1122

816

# Is this a D-Bus method?

1123

817

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

1124

818

# Create a new, but exactly alike, function

1135

829

attribute.func_name,

1136

830

attribute.func_defaults,

1137

831

attribute.func_closure)))

1138

# Copy annotations, if any

1139

try:

1140

attr[attrname]._dbus_annotations = (

1141

dict(attribute._dbus_annotations))

1142

except AttributeError:

1143

pass

1144

832

# Is this a D-Bus property?

1145

833

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

1146

834

# Create a new, but exactly alike, function

1160

848

attribute.func_name,

1161

849

attribute.func_defaults,

1162

850

attribute.func_closure)))

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1169

# Is this a D-Bus interface?

1170

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

1171

# Create a new, but exactly alike, function

1172

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

1173

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

1174

# to the class.

1175

attr[attrname] = (dbus_interface_annotations

1176

(alt_interface)

1177

(types.FunctionType

1178

(attribute.func_code,

1179

attribute.func_globals,

1180

attribute.func_name,

1181

attribute.func_defaults,

1182

attribute.func_closure)))

1183

if deprecate:

1184

# Deprecate all alternate interfaces

1185

iname="_AlternateDBusNames_interface_annotation{0}"

1186

for interface_name in interface_names:

1187

@dbus_interface_annotations(interface_name)

1188

def func(self):

1189

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

1190

"true" }

1191

# Find an unused name

1192

for aname in (iname.format(i)

1193

for i in itertools.count()):

1194

if aname not in attr:

1195

attr[aname] = func

1196

break

1197

if interface_names:

1198

# Replace the class with a new subclass of it with

1199

# methods, signals, etc. as created above.

1200

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

1201

(cls,), attr)

1202

return cls

1203

return wrapper

1204

1205

1206

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

1207

"se.bsnet.fukt.Mandos"})

851

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

852

1208

853

class ClientDBus(Client, DBusObjectWithProperties):

1209

854

"""A Client class using D-Bus

1210

855

1219

864

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

1220

865

1221

866

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

867

self._approvals_pending = 0

1222

868

self.bus = bus

1223

869

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

1224

870

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

1230

876

("/clients/" + client_object_name))

1231

877

DBusObjectWithProperties.__init__(self, self.bus,

1232

878

self.dbus_object_path)

1233

879

1234

880

def notifychangeproperty(transform_func,

1235

881

dbus_name, type_func=lambda x: x,

1236

882

variant_level=1):

1237

883

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

1238

884

its changes to DBus.

1239

1240

transform_fun: Function that takes a value and a variant_level

1241

and transforms it to a D-Bus type.

885

886

transform_fun: Function that takes a value and transforms it

887

to a D-Bus type.

1242

888

dbus_name: D-Bus name of the variable

1243

889

type_func: Function that transform the value before sending it

1244

890

to the D-Bus. Default: no transform

1245

891

variant_level: D-Bus variant level. Default: 1

1246

892

"""

1247

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

893

real_value = [None,]

1248

894

def setter(self, value):

895

old_value = real_value[0]

896

real_value[0] = value

1249

897

if hasattr(self, "dbus_object_path"):

1250

if (not hasattr(self, attrname) or

1251

type_func(getattr(self, attrname, None))

1252

!= type_func(value)):

1253

dbus_value = transform_func(type_func(value),

1254

variant_level

1255

=variant_level)

898

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

899

dbus_value = transform_func(type_func(real_value[0]),

900

variant_level)

1256

901

self.PropertyChanged(dbus.String(dbus_name),

1257

902

dbus_value)

1258

setattr(self, attrname, value)

1259

903

1260

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

904

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

905

1261

906

1262

907

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1263

908

approvals_pending = notifychangeproperty(dbus.Boolean,

1267

912

last_enabled = notifychangeproperty(datetime_to_dbus,

1268

913

"LastEnabled")

1269

914

checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",

1270

type_func = lambda checker:

1271

checker is not None)

915

type_func = lambda checker: checker is not None)

1272

916

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1273

917

"LastCheckedOK")

1274

last_checker_status = notifychangeproperty(dbus.Int16,

1275

"LastCheckerStatus")

1276

last_approval_request = notifychangeproperty(

1277

datetime_to_dbus, "LastApprovalRequest")

918

last_approval_request = notifychangeproperty(datetime_to_dbus,

919

"LastApprovalRequest")

1278

920

approved_by_default = notifychangeproperty(dbus.Boolean,

1279

921

"ApprovedByDefault")

1280

approval_delay = notifychangeproperty(dbus.UInt64,

1281

"ApprovalDelay",

1282

type_func =

1283

timedelta_to_milliseconds)

1284

approval_duration = notifychangeproperty(

1285

dbus.UInt64, "ApprovalDuration",

1286

type_func = timedelta_to_milliseconds)

922

approval_delay = notifychangeproperty(dbus.UInt16, "ApprovalDelay",

923

type_func = _timedelta_to_milliseconds)

924

approval_duration = notifychangeproperty(dbus.UInt16, "ApprovalDuration",

925

type_func = _timedelta_to_milliseconds)

1287

926

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

1288

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

1289

type_func =

1290

timedelta_to_milliseconds)

1291

extended_timeout = notifychangeproperty(

1292

dbus.UInt64, "ExtendedTimeout",

1293

type_func = timedelta_to_milliseconds)

1294

interval = notifychangeproperty(dbus.UInt64,

1295

"Interval",

1296

type_func =

1297

timedelta_to_milliseconds)

927

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

928

type_func = _timedelta_to_milliseconds)

929

extended_timeout = notifychangeproperty(dbus.UInt16, "ExtendedTimeout",

930

type_func = _timedelta_to_milliseconds)

931

interval = notifychangeproperty(dbus.UInt16, "Interval",

932

type_func = _timedelta_to_milliseconds)

1298

933

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

1299

934

1300

935

del notifychangeproperty

1342

977

return r

1343

978

1344

979

def _reset_approved(self):

1345

self.approved = None

980

self._approved = None

1346

981

return False

1347

982

1348

983

def approve(self, value=True):

1349

self.approved = value

1350

gobject.timeout_add(timedelta_to_milliseconds

984

self.send_changedstate()

985

self._approved = value

986

gobject.timeout_add(_timedelta_to_milliseconds

1351

987

(self.approval_duration),

1352

988

self._reset_approved)

1353

self.send_changedstate()

989

1354

990

1355

991

## D-Bus methods, signals & properties

1356

992

_interface = "se.recompile.Mandos.Client"

1357

993

1358

## Interfaces

1359

1360

@dbus_interface_annotations(_interface)

1361

def _foo(self):

1362

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

1363

"false"}

1364

1365

994

## Signals

1366

995

1367

996

# CheckerCompleted - signal

1466

1095

access="readwrite")

1467

1096

def ApprovalDuration_dbus_property(self, value=None):

1468

1097

if value is None: # get

1469

return dbus.UInt64(timedelta_to_milliseconds(

1098

return dbus.UInt64(_timedelta_to_milliseconds(

1470

1099

self.approval_duration))

1471

1100

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

1472

1101

1486

1115

def Host_dbus_property(self, value=None):

1487

1116

if value is None: # get

1488

1117

return dbus.String(self.host)

1489

self.host = unicode(value)

1118

self.host = value

1490

1119

1491

1120

# Created - property

1492

1121

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

1493

1122

def Created_dbus_property(self):

1494

return datetime_to_dbus(self.created)

1123

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

1495

1124

1496

1125

# LastEnabled - property

1497

1126

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

1518

1147

return

1519

1148

return datetime_to_dbus(self.last_checked_ok)

1520

1149

1521

# LastCheckerStatus - property

1522

@dbus_service_property(_interface, signature="n",

1523

access="read")

1524

def LastCheckerStatus_dbus_property(self):

1525

return dbus.Int16(self.last_checker_status)

1526

1527

1150

# Expires - property

1528

1151

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

1529

1152

def Expires_dbus_property(self):

1540

1163

def Timeout_dbus_property(self, value=None):

1541

1164

if value is None: # get

1542

1165

return dbus.UInt64(self.timeout_milliseconds())

1543

old_timeout = self.timeout

1544

1166

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

1545

# Reschedule disabling

1546

if self.enabled:

1547

now = datetime.datetime.utcnow()

1548

self.expires += self.timeout - old_timeout

1549

if self.expires <= now:

1550

# The timeout has passed

1551

self.disable()

1552

else:

1553

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

1554

is None):

1555

return

1556

gobject.source_remove(self.disable_initiator_tag)

1557

self.disable_initiator_tag = (

1558

gobject.timeout_add(

1559

timedelta_to_milliseconds(self.expires - now),

1560

self.disable))

1167

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

1168

return

1169

# Reschedule timeout

1170

gobject.source_remove(self.disable_initiator_tag)

1171

self.disable_initiator_tag = None

1172

self.expires = None

1173

time_to_die = (self.

1174

_timedelta_to_milliseconds((self

1175

.last_checked_ok

1176

+ self.timeout)

1177

- datetime.datetime

1178

.utcnow()))

1179

if time_to_die <= 0:

1180

# The timeout has passed

1181

self.disable()

1182

else:

1183

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

1184

+ datetime.timedelta(milliseconds = time_to_die))

1185

self.disable_initiator_tag = (gobject.timeout_add

1186

(time_to_die, self.disable))

1561

1187

1562

1188

# ExtendedTimeout - property

1563

1189

@dbus_service_property(_interface, signature="t",

1576

1202

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

1577

1203

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

1578

1204

return

1579

if self.enabled:

1580

# Reschedule checker run

1581

gobject.source_remove(self.checker_initiator_tag)

1582

self.checker_initiator_tag = (gobject.timeout_add

1583

(value, self.start_checker))

1584

self.start_checker() # Start one now, too

1205

# Reschedule checker run

1206

gobject.source_remove(self.checker_initiator_tag)

1207

self.checker_initiator_tag = (gobject.timeout_add

1208

(value, self.start_checker))

1209

self.start_checker() # Start one now, too

1585

1210

1586

1211

# Checker - property

1587

1212

@dbus_service_property(_interface, signature="s",

1589

1214

def Checker_dbus_property(self, value=None):

1590

1215

if value is None: # get

1591

1216

return dbus.String(self.checker_command)

1592

self.checker_command = unicode(value)

1217

self.checker_command = value

1593

1218

1594

1219

# CheckerRunning - property

1595

1220

@dbus_service_property(_interface, signature="b",

1624

1249

raise KeyError()

1625

1250

1626

1251

def __getattribute__(self, name):

1627

if name == '_pipe':

1252

if(name == '_pipe'):

1628

1253

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

1629

1254

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

1630

1255

data = self._pipe.recv()

1637

1262

return func

1638

1263

1639

1264

def __setattr__(self, name, value):

1640

if name == '_pipe':

1265

if(name == '_pipe'):

1641

1266

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

1642

1267

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

1643

1268

1269

class ClientDBusTransitional(ClientDBus):

1270

__metaclass__ = AlternateDBusNamesMetaclass

1644

1271

1645

1272

class ClientHandler(socketserver.BaseRequestHandler, object):

1646

1273

"""A class to handle client connections.

1726

1353

client.name)

1727

1354

if self.server.use_dbus:

1728

1355

# Emit D-Bus signal

1729

client.Rejected("Disabled")

1356

client.Rejected("Disabled")

1730

1357

return

1731

1358

1732

if client.approved or not client.approval_delay:

1359

if client._approved or not client.approval_delay:

1733

1360

#We are approved or approval is disabled

1734

1361

break

1735

elif client.approved is None:

1362

elif client._approved is None:

1736

1363

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

1737

1364

client.name)

1738

1365

if self.server.use_dbus:

1749

1376

return

1750

1377

1751

1378

#wait until timeout or approved

1379

#x = float(client._timedelta_to_milliseconds(delay))

1752

1380

time = datetime.datetime.now()

1753

1381

client.changedstate.acquire()

1754

client.changedstate.wait(

1755

float(timedelta_to_milliseconds(delay)

1756

/ 1000))

1382

client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))

1757

1383

client.changedstate.release()

1758

1384

time2 = datetime.datetime.now()

1759

1385

if (time2 - time) >= delay:

1775

1401

try:

1776

1402

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

1777

1403

except gnutls.errors.GNUTLSError as error:

1778

logger.warning("gnutls send failed",

1779

exc_info=error)

1404

logger.warning("gnutls send failed")

1780

1405

return

1781

1406

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

1782

1407

sent, len(client.secret)

1784

1409

sent_size += sent

1785

1410

1786

1411

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

1787

# bump the timeout using extended_timeout

1788

client.bump_timeout(client.extended_timeout)

1412

# bump the timeout as if seen

1413

client.checked_ok(client.extended_timeout)

1789

1414

if self.server.use_dbus:

1790

1415

# Emit D-Bus signal

1791

1416

client.GotSecret()

1796

1421

try:

1797

1422

session.bye()

1798

1423

except gnutls.errors.GNUTLSError as error:

1799

logger.warning("GnuTLS bye failed",

1800

exc_info=error)

1424

logger.warning("GnuTLS bye failed")

1801

1425

1802

1426

@staticmethod

1803

1427

def peer_certificate(session):

1859

1483

# Convert the buffer to a Python bytestring

1860

1484

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

1861

1485

# Convert the bytestring to hexadecimal notation

1862

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

1486

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

1863

1487

return hex_fpr

1864

1488

1865

1489

1868

1492

def sub_process_main(self, request, address):

1869

1493

try:

1870

1494

self.finish_request(request, address)

1871

except Exception:

1495

except:

1872

1496

self.handle_error(request, address)

1873

1497

self.close_request(request)

1874

1498

1875

1499

def process_request(self, request, address):

1876

1500

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

1877

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

1878

args = (request, address))

1879

proc.start()

1880

return proc

1501

multiprocessing.Process(target = self.sub_process_main,

1502

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

1881

1503

1882

1504

1883

1505

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1889

1511

"""

1890

1512

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1891

1513

1892

proc = MultiprocessingMixIn.process_request(self, request,

1893

client_address)

1514

super(MultiprocessingMixInWithPipe,

1515

self).process_request(request, client_address)

1894

1516

self.child_pipe.close()

1895

self.add_pipe(parent_pipe, proc)

1517

self.add_pipe(parent_pipe)

1896

1518

1897

def add_pipe(self, parent_pipe, proc):

1519

def add_pipe(self, parent_pipe):

1898

1520

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

1899

1521

raise NotImplementedError

1900

1522

1909

1531

use_ipv6: Boolean; to use IPv6 or not

1910

1532

"""

1911

1533

def __init__(self, server_address, RequestHandlerClass,

1912

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

1913

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

1914

creating a new one with socket.socket().

1915

"""

1534

interface=None, use_ipv6=True):

1916

1535

self.interface = interface

1917

1536

if use_ipv6:

1918

1537

self.address_family = socket.AF_INET6

1919

if socketfd is not None:

1920

# Save the file descriptor

1921

self.socketfd = socketfd

1922

# Save the original socket.socket() function

1923

self.socket_socket = socket.socket

1924

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

1925

#

1926

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

1927

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

1928

# patching socket.socket.)

1929

#

1930

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

1931

@functools.wraps(socket.socket)

1932

def socket_wrapper(*args, **kwargs):

1933

# Restore original function so subsequent calls are

1934

# not affected.

1935

socket.socket = self.socket_socket

1936

del self.socket_socket

1937

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

1938

# saved file descriptor.

1939

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

1940

# Replace socket.socket() function with wrapper

1941

socket.socket = socket_wrapper

1942

# The socketserver.TCPServer.__init__ will call

1943

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

1944

# socket_wrapper(), if socketfd was set.

1945

1538

socketserver.TCPServer.__init__(self, server_address,

1946

1539

RequestHandlerClass)

1947

1948

1540

def server_bind(self):

1949

1541

"""This overrides the normal server_bind() function

1950

1542

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

1958

1550

try:

1959

1551

self.socket.setsockopt(socket.SOL_SOCKET,

1960

1552

SO_BINDTODEVICE,

1961

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

1553

str(self.interface

1554

+ '\0'))

1962

1555

except socket.error as error:

1963

if error.errno == errno.EPERM:

1964

logger.error("No permission to bind to"

1965

" interface %s", self.interface)

1966

elif error.errno == errno.ENOPROTOOPT:

1556

if error[0] == errno.EPERM:

1557

logger.error("No permission to"

1558

" bind to interface %s",

1559

self.interface)

1560

elif error[0] == errno.ENOPROTOOPT:

1967

1561

logger.error("SO_BINDTODEVICE not available;"

1968

1562

" cannot bind to interface %s",

1969

1563

self.interface)

1970

elif error.errno == errno.ENODEV:

1971

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

1972

" cannot bind", self.interface)

1973

1564

else:

1974

1565

raise

1975

1566

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

2005

1596

"""

2006

1597

def __init__(self, server_address, RequestHandlerClass,

2007

1598

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

2008

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

1599

gnutls_priority=None, use_dbus=True):

2009

1600

self.enabled = False

2010

1601

self.clients = clients

2011

1602

if self.clients is None:

2012

self.clients = {}

1603

self.clients = set()

2013

1604

self.use_dbus = use_dbus

2014

1605

self.gnutls_priority = gnutls_priority

2015

1606

IPv6_TCPServer.__init__(self, server_address,

2016

1607

RequestHandlerClass,

2017

1608

interface = interface,

2018

use_ipv6 = use_ipv6,

2019

socketfd = socketfd)

1609

use_ipv6 = use_ipv6)

2020

1610

def server_activate(self):

2021

1611

if self.enabled:

2022

1612

return socketserver.TCPServer.server_activate(self)

2023

2024

1613

def enable(self):

2025

1614

self.enabled = True

2026

2027

def add_pipe(self, parent_pipe, proc):

1615

def add_pipe(self, parent_pipe):

2028

1616

# Call "handle_ipc" for both data and EOF events

2029

1617

gobject.io_add_watch(parent_pipe.fileno(),

2030

1618

gobject.IO_IN | gobject.IO_HUP,

2031

1619

functools.partial(self.handle_ipc,

2032

parent_pipe =

2033

parent_pipe,

2034

proc = proc))

2035

1620

parent_pipe = parent_pipe))

1621

2036

1622

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

2037

proc = None, client_object=None):

2038

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

2039

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

2040

# Wait for other process to exit

2041

proc.join()

1623

client_object=None):

1624

condition_names = {

1625

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

1626

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

1627

# blocking).

1628

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

1629

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

1630

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

1631

# broken, usually for pipes and

1632

# sockets).

1633

}

1634

conditions_string = ' | '.join(name

1635

for cond, name in

1636

condition_names.iteritems()

1637

if cond & condition)

1638

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

1639

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

2042

1640

return False

2043

1641

2044

1642

# Read a request from the child

2049

1647

fpr = request[1]

2050

1648

address = request[2]

2051

1649

2052

for c in self.clients.itervalues():

1650

for c in self.clients:

2053

1651

if c.fingerprint == fpr:

2054

1652

client = c

2055

1653

break

2058

1656

"dress: %s", fpr, address)

2059

1657

if self.use_dbus:

2060

1658

# Emit D-Bus signal

2061

mandos_dbus_service.ClientNotFound(fpr,

2062

address[0])

1659

mandos_dbus_service.ClientNotFound(fpr, address[0])

2063

1660

parent_pipe.send(False)

2064

1661

return False

2065

1662

2066

1663

gobject.io_add_watch(parent_pipe.fileno(),

2067

1664

gobject.IO_IN | gobject.IO_HUP,

2068

1665

functools.partial(self.handle_ipc,

2069

parent_pipe =

2070

parent_pipe,

2071

proc = proc,

2072

client_object =

2073

client))

1666

parent_pipe = parent_pipe,

1667

client_object = client))

2074

1668

parent_pipe.send(True)

2075

# remove the old hook in favor of the new above hook on

2076

# same fileno

1669

# remove the old hook in favor of the new above hook on same fileno

2077

1670

return False

2078

1671

if command == 'funcall':

2079

1672

funcname = request[1]

2080

1673

args = request[2]

2081

1674

kwargs = request[3]

2082

1675

2083

parent_pipe.send(('data', getattr(client_object,

2084

funcname)(*args,

2085

**kwargs)))

1676

parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))

2086

1677

2087

1678

if command == 'getattr':

2088

1679

attrname = request[1]

2089

1680

if callable(client_object.__getattribute__(attrname)):

2090

1681

parent_pipe.send(('function',))

2091

1682

else:

2092

parent_pipe.send(('data', client_object

2093

.__getattribute__(attrname)))

1683

parent_pipe.send(('data', client_object.__getattribute__(attrname)))

2094

1684

2095

1685

if command == 'setattr':

2096

1686

attrname = request[1]

2100

1690

return True

2101

1691

2102

1692

2103

def rfc3339_duration_to_delta(duration):

2104

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

2105

2106

>>> rfc3339_duration_to_delta("P7D")

2107

datetime.timedelta(7)

2108

>>> rfc3339_duration_to_delta("PT60S")

2109

datetime.timedelta(0, 60)

2110

>>> rfc3339_duration_to_delta("PT60M")

2111

datetime.timedelta(0, 3600)

2112

>>> rfc3339_duration_to_delta("PT24H")

2113

datetime.timedelta(1)

2114

>>> rfc3339_duration_to_delta("P1W")

2115

datetime.timedelta(7)

2116

>>> rfc3339_duration_to_delta("PT5M30S")

2117

datetime.timedelta(0, 330)

2118

>>> rfc3339_duration_to_delta("P1DT3M20S")

2119

datetime.timedelta(1, 200)

2120

"""

2121

2122

# Parsing an RFC 3339 duration with regular expressions is not

2123

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

2124

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

2125

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

2126

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

2127

# avoid excessive use of external libraries.

2128

2129

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

2130

Token = collections.namedtuple("Token",

2131

("regexp", # To match token; if

2132

# "value" is not None,

2133

# must have a "group"

2134

# containing digits

2135

"value", # datetime.timedelta or

2136

# None

2137

"followers")) # Tokens valid after

2138

# this token

2139

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

2140

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

2141

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

2142

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

2143

datetime.timedelta(seconds=1),

2144

frozenset((token_end,)))

2145

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

2146

datetime.timedelta(minutes=1),

2147

frozenset((token_second, token_end)))

2148

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

2149

datetime.timedelta(hours=1),

2150

frozenset((token_minute, token_end)))

2151

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

2152

None,

2153

frozenset((token_hour, token_minute,

2154

token_second)))

2155

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

2156

datetime.timedelta(days=1),

2157

frozenset((token_time, token_end)))

2158

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

2159

datetime.timedelta(weeks=4),

2160

frozenset((token_day, token_end)))

2161

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

2162

datetime.timedelta(weeks=52),

2163

frozenset((token_month, token_end)))

2164

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

2165

datetime.timedelta(weeks=1),

2166

frozenset((token_end,)))

2167

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

2168

frozenset((token_year, token_month,

2169

token_day, token_time,

2170

token_week))),

2171

# Define starting values

2172

value = datetime.timedelta() # Value so far

2173

found_token = None

2174

followers = frozenset(token_duration,) # Following valid tokens

2175

s = duration # String left to parse

2176

# Loop until end token is found

2177

while found_token is not token_end:

2178

# Search for any currently valid tokens

2179

for token in followers:

2180

match = token.regexp.match(s)

2181

if match is not None:

2182

# Token found

2183

if token.value is not None:

2184

# Value found, parse digits

2185

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

2186

# Add to value so far

2187

value += factor * token.value

2188

# Strip token from string

2189

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

2190

# Go to found token

2191

found_token = token

2192

# Set valid next tokens

2193

followers = found_token.followers

2194

break

2195

else:

2196

# No currently valid tokens were found

2197

raise ValueError("Invalid RFC 3339 duration")

2198

# End token found

2199

return value

2200

2201

2202

1693

def string_to_delta(interval):

2203

1694

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

2204

1695

2215

1706

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

2216

1707

datetime.timedelta(0, 330)

2217

1708

"""

2218

2219

try:

2220

return rfc3339_duration_to_delta(interval)

2221

except ValueError:

2222

pass

2223

2224

1709

timevalue = datetime.timedelta(0)

2225

1710

for s in interval.split():

2226

1711

try:

2237

1722

elif suffix == "w":

2238

1723

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

2239

1724

else:

2240

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

2241

.format(suffix))

1725

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

2242

1726

except (ValueError, IndexError) as e:

2243

1727

raise ValueError(*(e.args))

2244

1728

timevalue += delta

2245

1729

return timevalue

2246

1730

2247

1731

1732

def if_nametoindex(interface):

1733

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

1734

1735

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

1736

global if_nametoindex

1737

try:

1738

if_nametoindex = (ctypes.cdll.LoadLibrary

1739

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

1740

.if_nametoindex)

1741

except (OSError, AttributeError):

1742

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

1743

def if_nametoindex(interface):

1744

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

1745

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

1746

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

1747

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1748

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

1749

interface))

1750

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

1751

ifreq[16:20])[0]

1752

return interface_index

1753

return if_nametoindex(interface)

1754

1755

2248

1756

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

2249

1757

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

2250

1758

2258

1766

sys.exit()

2259

1767

if not noclose:

2260

1768

# Close all standard open file descriptors

2261

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

1769

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

2262

1770

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

2263

1771

raise OSError(errno.ENODEV,

2264

"{0} not a character device"

2265

.format(os.devnull))

1772

"%s not a character device"

1773

% os.path.devnull)

2266

1774

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

2267

1775

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

2268

1776

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

2277

1785

2278

1786

parser = argparse.ArgumentParser()

2279

1787

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

2280

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

1788

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

2281

1789

help="show version number and exit")

2282

1790

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

2283

1791

help="Bind to interface IF")

2305

1813

" system bus interface")

2306

1814

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

2307

1815

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

2308

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

2309

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

2310

" state")

2311

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

2312

help="Specify a file descriptor to a network"

2313

" socket to use instead of creating one")

2314

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

2315

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

2316

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

2317

help="Run in foreground")

2318

2319

1816

options = parser.parse_args()

2320

1817

2321

1818

if options.check:

2334

1831

"use_dbus": "True",

2335

1832

"use_ipv6": "True",

2336

1833

"debuglevel": "",

2337

"restore": "True",

2338

"socket": "",

2339

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

2340

"foreground": "False",

2341

1834

}

2342

1835

2343

1836

# Parse config file for server-global settings

2348

1841

# Convert the SafeConfigParser object to a dict

2349

1842

server_settings = server_config.defaults()

2350

1843

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

2351

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

1844

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

2352

1845

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

2353

1846

option)

2354

1847

if server_settings["port"]:

2355

1848

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

2356

1849

"port")

2357

if server_settings["socket"]:

2358

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

2359

"socket")

2360

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

2361

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

2362

# happen with a supplied network socket.

2363

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

2364

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

2365

["socket"])

2366

1850

del server_config

2367

1851

2368

1852

# Override the settings from the config file with command line

2369

1853

# options, if set.

2370

1854

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

2371

1855

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

2372

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

2373

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

1856

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

2374

1857

value = getattr(options, option)

2375

1858

if value is not None:

2376

1859

server_settings[option] = value

2379

1862

for option in server_settings.keys():

2380

1863

if type(server_settings[option]) is str:

2381

1864

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

2382

# Debug implies foreground

2383

if server_settings["debug"]:

2384

server_settings["foreground"] = True

2385

1865

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

2386

1866

2387

1867

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

2391

1871

debuglevel = server_settings["debuglevel"]

2392

1872

use_dbus = server_settings["use_dbus"]

2393

1873

use_ipv6 = server_settings["use_ipv6"]

2394

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

2395

stored_state_file)

2396

foreground = server_settings["foreground"]

2397

2398

if debug:

2399

initlogger(debug, logging.DEBUG)

2400

else:

2401

if not debuglevel:

2402

initlogger(debug)

2403

else:

2404

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

2405

initlogger(debug, level)

2406

1874

2407

1875

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

2408

1876

syslogger.setFormatter(logging.Formatter

2409

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

2410

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

2411

.format(server_settings

2412

["servicename"])))

1877

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

1878

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

1879

% server_settings["servicename"]))

2413

1880

2414

1881

# Parse config file with clients

2415

client_config = configparser.SafeConfigParser(Client

2416

.client_defaults)

1882

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

1883

"extended_timeout": "15m",

1884

"interval": "2m",

1885

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

1886

"host": "",

1887

"approval_delay": "0s",

1888

"approval_duration": "1s",

1889

}

1890

client_config = configparser.SafeConfigParser(client_defaults)

2417

1891

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

2418

1892

"clients.conf"))

2419

1893

2428

1902

use_ipv6=use_ipv6,

2429

1903

gnutls_priority=

2430

1904

server_settings["priority"],

2431

use_dbus=use_dbus,

2432

socketfd=(server_settings["socket"]

2433

or None))

2434

if not foreground:

1905

use_dbus=use_dbus)

1906

if not debug:

2435

1907

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

2436

pidfile = None

2437

1908

try:

2438

1909

pidfile = open(pidfilename, "w")

2439

except IOError as e:

2440

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

2441

exc_info=e)

1910

except IOError:

1911

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

2442

1912

2443

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

1913

try:

1914

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

1915

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

1916

except KeyError:

2444

1917

try:

2445

uid = pwd.getpwnam(name).pw_uid

2446

gid = pwd.getpwnam(name).pw_gid

2447

break

1918

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

1919

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

2448

1920

except KeyError:

2449

continue

2450

else:

2451

uid = 65534

2452

gid = 65534

1921

try:

1922

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

1923

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

1924

except KeyError:

1925

uid = 65534

1926

gid = 65534

2453

1927

try:

2454

1928

os.setgid(gid)

2455

1929

os.setuid(uid)

2456

1930

except OSError as error:

2457

if error.errno != errno.EPERM:

1931

if error[0] != errno.EPERM:

2458

1932

raise error

2459

1933

1934

if not debug and not debuglevel:

1935

syslogger.setLevel(logging.WARNING)

1936

console.setLevel(logging.WARNING)

1937

if debuglevel:

1938

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

1939

syslogger.setLevel(level)

1940

console.setLevel(level)

1941

2460

1942

if debug:

2461

1943

# Enable all possible GnuTLS debugging

2462

1944

2472

1954

.gnutls_global_set_log_function(debug_gnutls))

2473

1955

2474

1956

# Redirect stdin so all checkers get /dev/null

2475

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

1957

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

2476

1958

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

2477

1959

if null > 2:

2478

1960

os.close(null)

1961

else:

1962

# No console logging

1963

logger.removeHandler(console)

2479

1964

2480

1965

# Need to fork before connecting to D-Bus

2481

if not foreground:

1966

if not debug:

2482

1967

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

2483

1968

daemon()

2484

1969

2485

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

2486

# need to inform gobject that threads will be used.

2487

gobject.threads_init()

2488

2489

1970

global main_loop

2490

1971

# From the Avahi example code

2491

DBusGMainLoop(set_as_default=True)

1972

DBusGMainLoop(set_as_default=True )

2492

1973

main_loop = gobject.MainLoop()

2493

1974

bus = dbus.SystemBus()

2494

1975

# End of Avahi example code

2496

1977

try:

2497

1978

bus_name = dbus.service.BusName("se.recompile.Mandos",

2498

1979

bus, do_not_queue=True)

2499

old_bus_name = (dbus.service.BusName

2500

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

2501

do_not_queue=True))

1980

old_bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",

1981

bus, do_not_queue=True)

2502

1982

except dbus.exceptions.NameExistsException as e:

2503

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

1983

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

2504

1984

use_dbus = False

2505

1985

server_settings["use_dbus"] = False

2506

1986

tcp_server.use_dbus = False

2507

1987

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2508

service = AvahiServiceToSyslog(name =

2509

server_settings["servicename"],

2510

servicetype = "_mandos._tcp",

2511

protocol = protocol, bus = bus)

1988

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

1989

servicetype = "_mandos._tcp",

1990

protocol = protocol, bus = bus)

2512

1991

if server_settings["interface"]:

2513

1992

service.interface = (if_nametoindex

2514

1993

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

2518

1997

2519

1998

client_class = Client

2520

1999

if use_dbus:

2521

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

2522

2523

client_settings = Client.config_parser(client_config)

2524

old_client_settings = {}

2525

clients_data = {}

2526

2527

# Get client data and settings from last running state.

2528

if server_settings["restore"]:

2529

try:

2530

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

2531

clients_data, old_client_settings = (pickle.load

2532

(stored_state))

2533

os.remove(stored_state_path)

2534

except IOError as e:

2535

if e.errno == errno.ENOENT:

2536

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

2537

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

2538

else:

2539

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

2540

exc_info=e)

2541

raise

2542

except EOFError as e:

2543

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

2544

"EOFError:", exc_info=e)

2545

2546

with PGPEngine() as pgp:

2547

for client_name, client in clients_data.iteritems():

2548

# Decide which value to use after restoring saved state.

2549

# We have three different values: Old config file,

2550

# new config file, and saved state.

2551

# New config value takes precedence if it differs from old

2552

# config value, otherwise use saved state.

2553

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

2554

try:

2555

# For each value in new config, check if it

2556

# differs from the old config value (Except for

2557

# the "secret" attribute)

2558

if (name != "secret" and

2559

value != old_client_settings[client_name]

2560

[name]):

2561

client[name] = value

2562

except KeyError:

2563

pass

2564

2565

# Clients who has passed its expire date can still be

2566

# enabled if its last checker was successful. Clients

2567

# whose checker succeeded before we stored its state is

2568

# assumed to have successfully run all checkers during

2569

# downtime.

2570

if client["enabled"]:

2571

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

2572

if not client["last_checked_ok"]:

2573

logger.warning(

2574

"disabling client {0} - Client never "

2575

"performed a successful checker"

2576

.format(client_name))

2577

client["enabled"] = False

2578

elif client["last_checker_status"] != 0:

2579

logger.warning(

2580

"disabling client {0} - Client "

2581

"last checker failed with error code {1}"

2582

.format(client_name,

2583

client["last_checker_status"]))

2584

client["enabled"] = False

2585

else:

2586

client["expires"] = (datetime.datetime

2587

.utcnow()

2588

+ client["timeout"])

2589

logger.debug("Last checker succeeded,"

2590

" keeping {0} enabled"

2591

.format(client_name))

2000

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

2001

def client_config_items(config, section):

2002

special_settings = {

2003

"approved_by_default":

2004

lambda: config.getboolean(section,

2005

"approved_by_default"),

2006

}

2007

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

2592

2008

try:

2593

client["secret"] = (

2594

pgp.decrypt(client["encrypted_secret"],

2595

client_settings[client_name]

2596

["secret"]))

2597

except PGPError:

2598

# If decryption fails, we use secret from new settings

2599

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

2600

.format(client_name))

2601

client["secret"] = (

2602

client_settings[client_name]["secret"])

2603

2604

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

2605

for client_name in (set(old_client_settings)

2606

- set(client_settings)):

2607

del clients_data[client_name]

2608

for client_name in (set(client_settings)

2609

- set(old_client_settings)):

2610

clients_data[client_name] = client_settings[client_name]

2611

2612

# Create all client objects

2613

for client_name, client in clients_data.iteritems():

2614

tcp_server.clients[client_name] = client_class(

2615

name = client_name, settings = client)

2616

2009

yield (name, special_settings[name]())

2010

except KeyError:

2011

yield (name, value)

2012

2013

tcp_server.clients.update(set(

2014

client_class(name = section,

2015

config= dict(client_config_items(

2016

client_config, section)))

2017

for section in client_config.sections()))

2617

2018

if not tcp_server.clients:

2618

2019

logger.warning("No clients defined")

2619

2620

if not foreground:

2621

if pidfile is not None:

2622

try:

2623

with pidfile:

2624

pid = os.getpid()

2625

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

2626

except IOError:

2627

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

2628

pidfilename, pid)

2629

del pidfile

2020

2021

if not debug:

2022

try:

2023

with pidfile:

2024

pid = os.getpid()

2025

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

2026

del pidfile

2027

except IOError:

2028

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

2029

pidfilename, pid)

2030

except NameError:

2031

# "pidfile" was never created

2032

pass

2630

2033

del pidfilename

2034

2035

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

2631

2036

2632

2037

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

2633

2038

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

2634

2039

2635

2040

if use_dbus:

2636

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

2637

"se.bsnet.fukt.Mandos"})

2638

class MandosDBusService(DBusObjectWithProperties):

2041

class MandosDBusService(dbus.service.Object):

2639

2042

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

2640

2043

def __init__(self):

2641

2044

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

2642

2045

_interface = "se.recompile.Mandos"

2643

2046

2644

@dbus_interface_annotations(_interface)

2645

def _foo(self):

2646

return { "org.freedesktop.DBus.Property"

2647

".EmitsChangedSignal":

2648

"false"}

2649

2650

2047

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

2651

2048

def ClientAdded(self, objpath):

2652

2049

"D-Bus signal"

2666

2063

def GetAllClients(self):

2667

2064

"D-Bus method"

2668

2065

return dbus.Array(c.dbus_object_path

2669

for c in

2670

tcp_server.clients.itervalues())

2066

for c in tcp_server.clients)

2671

2067

2672

2068

@dbus.service.method(_interface,

2673

2069

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

2675

2071

"D-Bus method"

2676

2072

return dbus.Dictionary(

2677

2073

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

2678

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

2074

for c in tcp_server.clients),

2679

2075

signature="oa{sv}")

2680

2076

2681

2077

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

2682

2078

def RemoveClient(self, object_path):

2683

2079

"D-Bus method"

2684

for c in tcp_server.clients.itervalues():

2080

for c in tcp_server.clients:

2685

2081

if c.dbus_object_path == object_path:

2686

del tcp_server.clients[c.name]

2082

tcp_server.clients.remove(c)

2687

2083

c.remove_from_connection()

2688

2084

# Don't signal anything except ClientRemoved

2689

2085

c.disable(quiet=True)

2694

2090

2695

2091

del _interface

2696

2092

2697

mandos_dbus_service = MandosDBusService()

2093

class MandosDBusServiceTransitional(MandosDBusService):

2094

__metaclass__ = AlternateDBusNamesMetaclass

2095

mandos_dbus_service = MandosDBusServiceTransitional()

2698

2096

2699

2097

def cleanup():

2700

2098

"Cleanup function; run on exit"

2701

2099

service.cleanup()

2702

2100

2703

multiprocessing.active_children()

2704

if not (tcp_server.clients or client_settings):

2705

return

2706

2707

# Store client before exiting. Secrets are encrypted with key

2708

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

2709

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

2710

clients = {}

2711

with PGPEngine() as pgp:

2712

for client in tcp_server.clients.itervalues():

2713

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

2714

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

2715

key)

2716

client_dict = {}

2717

2718

# A list of attributes that can not be pickled

2719

# + secret.

2720

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

2721

"checker"))

2722

for name, typ in (inspect.getmembers

2723

(dbus.service.Object)):

2724

exclude.add(name)

2725

2726

client_dict["encrypted_secret"] = (client

2727

.encrypted_secret)

2728

for attr in client.client_structure:

2729

if attr not in exclude:

2730

client_dict[attr] = getattr(client, attr)

2731

2732

clients[client.name] = client_dict

2733

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

2734

2735

try:

2736

with (tempfile.NamedTemporaryFile

2737

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

2738

dir=os.path.dirname(stored_state_path),

2739

delete=False)) as stored_state:

2740

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

2741

tempname=stored_state.name

2742

os.rename(tempname, stored_state_path)

2743

except (IOError, OSError) as e:

2744

if not debug:

2745

try:

2746

os.remove(tempname)

2747

except NameError:

2748

pass

2749

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

2750

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

2751

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

2752

else:

2753

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

2754

exc_info=e)

2755

raise e

2756

2757

# Delete all clients, and settings from config

2758

2101

while tcp_server.clients:

2759

name, client = tcp_server.clients.popitem()

2102

client = tcp_server.clients.pop()

2760

2103

if use_dbus:

2761

2104

client.remove_from_connection()

2105

client.disable_hook = None

2762

2106

# Don't signal anything except ClientRemoved

2763

2107

client.disable(quiet=True)

2764

2108

if use_dbus:

2765

2109

# Emit D-Bus signal

2766

mandos_dbus_service.ClientRemoved(client

2767

.dbus_object_path,

2110

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2768

2111

client.name)

2769

client_settings.clear()

2770

2112

2771

2113

atexit.register(cleanup)

2772

2114

2773

for client in tcp_server.clients.itervalues():

2115

for client in tcp_server.clients:

2774

2116

if use_dbus:

2775

2117

# Emit D-Bus signal

2776

2118

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2777

# Need to initiate checking of clients

2778

if client.enabled:

2779

client.init_checker()

2119

client.enable()

2780

2120

2781

2121

tcp_server.enable()

2782

2122

tcp_server.server_activate()

2785

2125

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

2786

2126

if use_ipv6:

2787

2127

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

2788

" flowinfo %d, scope_id %d",

2789

*tcp_server.socket.getsockname())

2128

" flowinfo %d, scope_id %d"

2129

% tcp_server.socket.getsockname())

2790

2130

else: # IPv4

2791

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

2792

*tcp_server.socket.getsockname())

2131

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

2132

% tcp_server.socket.getsockname())

2793

2133

2794

2134

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

2795

2135

2798

2138

try:

2799

2139

service.activate()

2800

2140

except dbus.exceptions.DBusException as error:

2801

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

2141

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

2802

2142

cleanup()

2803

2143

sys.exit(1)

2804

2144

# End of Avahi example code

2811

2151

logger.debug("Starting main loop")

2812

2152

main_loop.run()

2813

2153

except AvahiError as error:

2814

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

2154

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

2815

2155

cleanup()

2816

2156

sys.exit(1)

2817

2157

except KeyboardInterrupt:

2822

2162

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

2823

2163

cleanup()

2824

2164

2165

2825

2166

if __name__ == '__main__':

2826

2167

main()