/mandos/release : revision 237.7.195

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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 hashlib

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import binascii

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import tempfile

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import itertools

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import collections

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import Crypto.Cipher.AES

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.4.1"

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stored_state_path = "/var/lib/mandos/clients.pickle"

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version = "1.6.2"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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def initlogger(level=logging.WARNING):

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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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' %(message)s'))

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logger.addHandler(syslogger)

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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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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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encoded = b"mandos" + binascii.hexlify(password)

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if len(encoded) > 2048:

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# GnuPG can't handle long passwords, so encode differently

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encoded = (b"mandos" + password.replace(b"\\", b"\\\\")

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.replace(b"\n", b"\\n")

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.replace(b"\0", b"\\x00"))

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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class AvahiError(Exception):

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

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self.value = value

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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

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.format(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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dbus.exceptions.DBusException):

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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

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

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% self.name))

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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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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 status

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of last checker. -1 reflect crashed checker,

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or None.

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last_enabled: datetime.datetime(); (UTC)

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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

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

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"last_approval_request", "last_checked_ok",

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.timeout)

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return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.extended_timeout)

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return timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.interval)

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return timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return _timedelta_to_milliseconds(self.approval_delay)

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

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

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

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attribute."""

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

491

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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530

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

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self.name = name

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if config is None:

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config = {}

532

if server_settings is None:

533

server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

536

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"):

541

self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

365

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

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if "secret" in config:

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

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elif "secfile" in config:

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

370

(config["secfile"])),

371

"rb") as secfile:

372

self.secret = secfile.read()

373

else:

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

375

% self.name)

376

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

377

self.created = datetime.datetime.utcnow()

378

self.enabled = True

379

self.last_approval_request = None

380

self.last_enabled = datetime.datetime.utcnow()

381

self.last_checked_ok = None

382

self.last_checker_status = None

383

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

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self.extended_timeout = string_to_delta(config

385

["extended_timeout"])

386

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

554

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

555

datetime.datetime.utcnow())

556

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# attributes specific for this server instance

387

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self.checker = None

388

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

390

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

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self.checker_callback_tag = None

392

self.checker_command = config["checker"]

393

562

self.current_checker_command = None

394

self._approved = None

395

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

396

True)

563

self.approved = None

397

564

self.approvals_pending = 0

398

self.approval_delay = string_to_delta(

399

config["approval_delay"])

400

self.approval_duration = string_to_delta(

401

config["approval_duration"])

402

565

self.changedstate = (multiprocessing_manager

403

566

.Condition(multiprocessing_manager

404

567

.Lock()))

405

self.client_structure = [attr for attr in self.__dict__.iterkeys() if not attr.startswith("_")]

568

self.client_structure = [attr for attr in

569

self.__dict__.iterkeys()

570

if not attr.startswith("_")]

406

571

self.client_structure.append("client_structure")

407

408

572

409

573

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

410

lambda obj: isinstance(obj, property)):

574

lambda obj:

575

isinstance(obj,

576

property)):

411

577

if not name.startswith("_"):

412

578

self.client_structure.append(name)

413

579

421

587

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

422

588

# Already enabled

423

589

return

424

self.send_changedstate()

425

590

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

426

591

self.enabled = True

427

592

self.last_enabled = datetime.datetime.utcnow()

428

593

self.init_checker()

594

self.send_changedstate()

429

595

430

596

def disable(self, quiet=True):

431

597

"""Disable this client."""

432

598

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

433

599

return False

434

600

if not quiet:

435

self.send_changedstate()

436

if not quiet:

437

601

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

438

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

602

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

439

603

gobject.source_remove(self.disable_initiator_tag)

440

604

self.disable_initiator_tag = None

441

605

self.expires = None

442

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

606

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

443

607

gobject.source_remove(self.checker_initiator_tag)

444

608

self.checker_initiator_tag = None

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609

self.stop_checker()

446

610

self.enabled = False

611

if not quiet:

612

self.send_changedstate()

447

613

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

448

614

return False

449

615

450

616

def __del__(self):

451

617

self.disable()

452

618

453

619

def init_checker(self):

454

620

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

455

621

# and every interval from then on.

622

if self.checker_initiator_tag is not None:

623

gobject.source_remove(self.checker_initiator_tag)

456

624

self.checker_initiator_tag = (gobject.timeout_add

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625

(self.interval_milliseconds(),

458

626

self.start_checker))

459

627

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

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

460

630

self.disable_initiator_tag = (gobject.timeout_add

461

631

(self.timeout_milliseconds(),

462

632

self.disable))

463

633

# Also start a new checker *right now*.

464

634

self.start_checker()

465

466

635

467

636

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

468

637

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

469

638

self.checker_callback_tag = None

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639

self.checker = None

471

640

if os.WIFEXITED(condition):

472

self.last_checker_status = os.WEXITSTATUS(condition)

641

self.last_checker_status = os.WEXITSTATUS(condition)

473

642

if self.last_checker_status == 0:

474

643

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

475

644

vars(self))

482

651

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

483

652

vars(self))

484

653

485

def checked_ok(self, timeout=None):

486

"""Bump up the timeout for this client.

487

488

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

489

alive and well.

490

"""

654

def checked_ok(self):

655

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

656

self.last_checked_ok = datetime.datetime.utcnow()

657

self.last_checker_status = 0

658

self.bump_timeout()

659

660

def bump_timeout(self, timeout=None):

661

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

491

662

if timeout is None:

492

663

timeout = self.timeout

493

self.last_checked_ok = datetime.datetime.utcnow()

494

664

if self.disable_initiator_tag is not None:

495

665

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

496

667

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

497

668

self.disable_initiator_tag = (gobject.timeout_add

498

(_timedelta_to_milliseconds

669

(timedelta_to_milliseconds

499

670

(timeout), self.disable))

500

671

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

501

672

508

679

If a checker already exists, leave it running and do

509

680

nothing."""

510

681

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

511

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

512

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

513

# client would inevitably timeout, since no checker would get

514

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

682

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

683

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

684

# would inevitably timeout, since no checker would get a

685

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

515

686

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

516

687

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

517

688

# should be.

519

690

# If a checker exists, make sure it is not a zombie

520

691

try:

521

692

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

522

except (AttributeError, OSError) as error:

523

if (isinstance(error, OSError)

524

and error.errno != errno.ECHILD):

525

raise error

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

526

698

else:

527

699

if pid:

528

700

logger.warning("Checker was a zombie")

531

703

self.current_checker_command)

532

704

# Start a new checker if needed

533

705

if self.checker is None:

706

# Escape attributes for the shell

707

escaped_attrs = dict(

708

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

709

for attr in

710

self.runtime_expansions)

534

711

try:

535

# In case checker_command has exactly one % operator

536

command = self.checker_command % self.host

537

except TypeError:

538

# Escape attributes for the shell

539

escaped_attrs = dict(

540

(attr,

541

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

542

errors=

543

'replace')))

544

for attr in

545

self.runtime_expansions)

546

547

try:

548

command = self.checker_command % escaped_attrs

549

except TypeError as error:

550

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

551

' %s', self.checker_command, error)

552

return True # Try again later

712

command = self.checker_command % escaped_attrs

713

except TypeError as error:

714

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

715

self.checker_command, exc_info=error)

716

return True # Try again later

553

717

self.current_checker_command = command

554

718

try:

555

719

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

558

722

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

559

723

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

560

724

# always replaced by /dev/null.)

725

# The exception is when not debugging but nevertheless

726

# running in the foreground; use the previously

727

# created wnull.

728

popen_args = {}

729

if (not self.server_settings["debug"]

730

and self.server_settings["foreground"]):

731

popen_args.update({"stdout": wnull,

732

"stderr": wnull })

561

733

self.checker = subprocess.Popen(command,

562

734

close_fds=True,

563

shell=True, cwd="/")

564

self.checker_callback_tag = (gobject.child_watch_add

565

(self.checker.pid,

566

self.checker_callback,

567

data=command))

568

# The checker may have completed before the gobject

569

# watch was added. Check for this.

735

shell=True, cwd="/",

736

**popen_args)

737

except OSError as error:

738

logger.error("Failed to start subprocess",

739

exc_info=error)

740

return True

741

self.checker_callback_tag = (gobject.child_watch_add

742

(self.checker.pid,

743

self.checker_callback,

744

data=command))

745

# The checker may have completed before the gobject

746

# watch was added. Check for this.

747

try:

570

748

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

571

if pid:

572

gobject.source_remove(self.checker_callback_tag)

573

self.checker_callback(pid, status, command)

574

749

except OSError as error:

575

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

576

error)

750

if error.errno == errno.ECHILD:

751

# This should never happen

752

logger.error("Child process vanished",

753

exc_info=error)

754

return True

755

raise

756

if pid:

757

gobject.source_remove(self.checker_callback_tag)

758

self.checker_callback(pid, status, command)

577

759

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

578

760

return True

579

761

586

768

return

587

769

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

588

770

try:

589

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

771

self.checker.terminate()

590

772

#time.sleep(0.5)

591

773

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

592

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

774

# self.checker.kill()

593

775

except OSError as error:

594

776

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

595

777

raise

596

778

self.checker = None

597

779

598

# Encrypts a client secret and stores it in a varible encrypted_secret

599

def encrypt_secret(self, key):

600

# Encryption-key need to be of a specific size, so we hash inputed key

601

hasheng = hashlib.sha256()

602

hasheng.update(key)

603

encryptionkey = hasheng.digest()

604

605

# Create validation hash so we know at decryption if it was sucessful

606

hasheng = hashlib.sha256()

607

hasheng.update(self.secret)

608

validationhash = hasheng.digest()

609

610

# Encrypt secret

611

iv = os.urandom(Crypto.Cipher.AES.block_size)

612

ciphereng = Crypto.Cipher.AES.new(encryptionkey,

613

Crypto.Cipher.AES.MODE_CFB, iv)

614

ciphertext = ciphereng.encrypt(validationhash+self.secret)

615

self.encrypted_secret = (ciphertext, iv)

616

617

# Decrypt a encrypted client secret

618

def decrypt_secret(self, key):

619

# Decryption-key need to be of a specific size, so we hash inputed key

620

hasheng = hashlib.sha256()

621

hasheng.update(key)

622

encryptionkey = hasheng.digest()

623

624

# Decrypt encrypted secret

625

ciphertext, iv = self.encrypted_secret

626

ciphereng = Crypto.Cipher.AES.new(encryptionkey,

627

Crypto.Cipher.AES.MODE_CFB, iv)

628

plain = ciphereng.decrypt(ciphertext)

629

630

# Validate decrypted secret to know if it was succesful

631

hasheng = hashlib.sha256()

632

validationhash = plain[:hasheng.digest_size]

633

secret = plain[hasheng.digest_size:]

634

hasheng.update(secret)

635

636

# if validation fails, we use key as new secret. Otherwhise, we use

637

# the decrypted secret

638

if hasheng.digest() == validationhash:

639

self.secret = secret

640

else:

641

self.secret = key

642

del self.encrypted_secret

643

644

780

645

781

def dbus_service_property(dbus_interface, signature="v",

646

782

access="readwrite", byte_arrays=False):

658

794

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

659

795

if byte_arrays and signature != "ay":

660

796

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

661

" signature %r" % signature)

797

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

662

798

def decorator(func):

663

799

func._dbus_is_property = True

664

800

func._dbus_interface = dbus_interface

672

808

return decorator

673

809

674

810

811

def dbus_interface_annotations(dbus_interface):

812

"""Decorator for marking functions returning interface annotations

813

814

Usage:

815

816

@dbus_interface_annotations("org.example.Interface")

817

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

818

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

819

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

820

"false"}

821

"""

822

def decorator(func):

823

func._dbus_is_interface = True

824

func._dbus_interface = dbus_interface

825

func._dbus_name = dbus_interface

826

return func

827

return decorator

828

829

830

def dbus_annotations(annotations):

831

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

832

Usage:

833

834

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

835

access="r")

836

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

837

"org.freedesktop.DBus.Property."

838

"EmitsChangedSignal": "false"})

839

def Property_dbus_property(self):

840

return dbus.Boolean(False)

841

"""

842

def decorator(func):

843

func._dbus_annotations = annotations

844

return func

845

return decorator

846

847

675

848

class DBusPropertyException(dbus.exceptions.DBusException):

676

849

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

677

850

"""

700

873

"""

701

874

702

875

@staticmethod

703

def _is_dbus_property(obj):

704

return getattr(obj, "_dbus_is_property", False)

876

def _is_dbus_thing(thing):

877

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

878

879

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

880

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

881

"""

882

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

883

False)

705

884

706

def _get_all_dbus_properties(self):

885

def _get_all_dbus_things(self, thing):

707

886

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

708

887

"""

709

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

888

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

889

name),

890

athing.__get__(self))

710

891

for cls in self.__class__.__mro__

711

for name, prop in

712

inspect.getmembers(cls, self._is_dbus_property))

892

for name, athing in

893

inspect.getmembers(cls,

894

self._is_dbus_thing(thing)))

713

895

714

896

def _get_dbus_property(self, interface_name, property_name):

715

897

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

717

899

"""

718

900

for cls in self.__class__.__mro__:

719

901

for name, value in (inspect.getmembers

720

(cls, self._is_dbus_property)):

902

(cls,

903

self._is_dbus_thing("property"))):

721

904

if (value._dbus_name == property_name

722

905

and value._dbus_interface == interface_name):

723

906

return value.__get__(self)

752

935

# signatures other than "ay".

753

936

if prop._dbus_signature != "ay":

754

937

raise ValueError

755

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

756

for byte in value))

938

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

939

for byte in value))

757

940

prop(value)

758

941

759

942

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

764

947

765

948

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

766

949

"""

767

all = {}

768

for name, prop in self._get_all_dbus_properties():

950

properties = {}

951

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

769

952

if (interface_name

770

953

and interface_name != prop._dbus_interface):

771

954

# Interface non-empty but did not match

775

958

continue

776

959

value = prop()

777

960

if not hasattr(value, "variant_level"):

778

all[name] = value

961

properties[name] = value

779

962

continue

780

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

781

value.variant_level+1)

782

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

963

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

964

value.variant_level+1)

965

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

783

966

784

967

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

785

968

out_signature="s",

786

969

path_keyword='object_path',

787

970

connection_keyword='connection')

788

971

def Introspect(self, object_path, connection):

789

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

972

"""Overloading of standard D-Bus method.

973

974

Inserts property tags and interface annotation tags.

790

975

"""

791

976

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

792

977

connection)

799

984

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

800

985

return e

801

986

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

987

# Add property tags

802

988

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

803

989

for name, prop

804

in self._get_all_dbus_properties()

990

in self._get_all_dbus_things("property")

805

991

if prop._dbus_interface

806

992

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

807

993

if_tag.appendChild(tag)

994

# Add annotation tags

995

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

996

for tag in if_tag.getElementsByTagName(typ):

997

annots = dict()

998

for name, prop in (self.

999

_get_all_dbus_things(typ)):

1000

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

1001

and prop._dbus_interface

1002

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

1003

annots.update(getattr

1004

(prop,

1005

"_dbus_annotations",

1006

{}))

1007

for name, value in annots.iteritems():

1008

ann_tag = document.createElement(

1009

"annotation")

1010

ann_tag.setAttribute("name", name)

1011

ann_tag.setAttribute("value", value)

1012

tag.appendChild(ann_tag)

1013

# Add interface annotation tags

1014

for annotation, value in dict(

1015

itertools.chain.from_iterable(

1016

annotations().iteritems()

1017

for name, annotations in

1018

self._get_all_dbus_things("interface")

1019

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

1020

)).iteritems():

1021

ann_tag = document.createElement("annotation")

1022

ann_tag.setAttribute("name", annotation)

1023

ann_tag.setAttribute("value", value)

1024

if_tag.appendChild(ann_tag)

808

1025

# Add the names to the return values for the

809

1026

# "org.freedesktop.DBus.Properties" methods

810

1027

if (if_tag.getAttribute("name")

825

1042

except (AttributeError, xml.dom.DOMException,

826

1043

xml.parsers.expat.ExpatError) as error:

827

1044

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

828

error)

1045

exc_info=error)

829

1046

return xmlstring

830

1047

831

1048

832

def datetime_to_dbus (dt, variant_level=0):

1049

def datetime_to_dbus(dt, variant_level=0):

833

1050

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

834

1051

if dt is None:

835

1052

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

836

1053

return dbus.String(dt.isoformat(),

837

1054

variant_level=variant_level)

838

1055

839

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

840

.__metaclass__):

841

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

842

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

1056

1057

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1058

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

1059

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

1060

interface names according to the "alt_interface_names" mapping.

1061

Usage:

1062

1063

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

1064

"net.example.AlternateInterface"})

1065

class SampleDBusObject(dbus.service.Object):

1066

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

1067

def SampleDBusMethod():

1068

pass

1069

1070

The above "SampleDBusMethod" on "SampleDBusObject" will be

1071

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

1072

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

1073

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

1074

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

1075

1076

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

1077

(from DBusObjectWithProperties) and interfaces (from the

1078

dbus_interface_annotations decorator).

843

1079

"""

844

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

845

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

846

# methods, signals, or properties in them

847

for base in (b for b in bases

848

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

849

# Go though all attributes of the base class

850

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

1080

def wrapper(cls):

1081

for orig_interface_name, alt_interface_name in (

1082

alt_interface_names.iteritems()):

1083

attr = {}

1084

interface_names = set()

1085

# Go though all attributes of the class

1086

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

851

1087

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

852

1088

# with the wrong interface name

853

1089

if (not hasattr(attribute, "_dbus_interface")

854

1090

or not attribute._dbus_interface

855

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

1091

.startswith(orig_interface_name)):

856

1092

continue

857

1093

# Create an alternate D-Bus interface name based on

858

1094

# the current name

859

1095

alt_interface = (attribute._dbus_interface

860

.replace("se.recompile.Mandos",

861

"se.bsnet.fukt.Mandos"))

1096

.replace(orig_interface_name,

1097

alt_interface_name))

1098

interface_names.add(alt_interface)

862

1099

# Is this a D-Bus signal?

863

1100

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

864

# Extract the original non-method function by

865

# black magic

1101

# Extract the original non-method undecorated

1102

# function by black magic

866

1103

nonmethod_func = (dict(

867

1104

zip(attribute.func_code.co_freevars,

868

1105

attribute.__closure__))["func"]

879

1116

nonmethod_func.func_name,

880

1117

nonmethod_func.func_defaults,

881

1118

nonmethod_func.func_closure)))

1119

# Copy annotations, if any

1120

try:

1121

new_function._dbus_annotations = (

1122

dict(attribute._dbus_annotations))

1123

except AttributeError:

1124

pass

882

1125

# Define a creator of a function to call both the

883

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

884

# signals gets sent when the function is called

1126

# original and alternate functions, so both the

1127

# original and alternate signals gets sent when

1128

# the function is called

885

1129

def fixscope(func1, func2):

886

1130

"""This function is a scope container to pass

887

1131

func1 and func2 to the "call_both" function

894

1138

return call_both

895

1139

# Create the "call_both" function and add it to

896

1140

# the class

897

attr[attrname] = fixscope(attribute,

898

new_function)

1141

attr[attrname] = fixscope(attribute, new_function)

899

1142

# Is this a D-Bus method?

900

1143

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

901

1144

# Create a new, but exactly alike, function

912

1155

attribute.func_name,

913

1156

attribute.func_defaults,

914

1157

attribute.func_closure)))

1158

# Copy annotations, if any

1159

try:

1160

attr[attrname]._dbus_annotations = (

1161

dict(attribute._dbus_annotations))

1162

except AttributeError:

1163

pass

915

1164

# Is this a D-Bus property?

916

1165

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

917

1166

# Create a new, but exactly alike, function

931

1180

attribute.func_name,

932

1181

attribute.func_defaults,

933

1182

attribute.func_closure)))

934

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

935

1183

# Copy annotations, if any

1184

try:

1185

attr[attrname]._dbus_annotations = (

1186

dict(attribute._dbus_annotations))

1187

except AttributeError:

1188

pass

1189

# Is this a D-Bus interface?

1190

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

1191

# Create a new, but exactly alike, function

1192

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

1193

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

1194

# to the class.

1195

attr[attrname] = (dbus_interface_annotations

1196

(alt_interface)

1197

(types.FunctionType

1198

(attribute.func_code,

1199

attribute.func_globals,

1200

attribute.func_name,

1201

attribute.func_defaults,

1202

attribute.func_closure)))

1203

if deprecate:

1204

# Deprecate all alternate interfaces

1205

iname="_AlternateDBusNames_interface_annotation{0}"

1206

for interface_name in interface_names:

1207

@dbus_interface_annotations(interface_name)

1208

def func(self):

1209

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

1210

"true" }

1211

# Find an unused name

1212

for aname in (iname.format(i)

1213

for i in itertools.count()):

1214

if aname not in attr:

1215

attr[aname] = func

1216

break

1217

if interface_names:

1218

# Replace the class with a new subclass of it with

1219

# methods, signals, etc. as created above.

1220

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

1221

(cls,), attr)

1222

return cls

1223

return wrapper

1224

1225

1226

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

1227

"se.bsnet.fukt.Mandos"})

936

1228

class ClientDBus(Client, DBusObjectWithProperties):

937

1229

"""A Client class using D-Bus

938

1230

949

1241

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

950

1242

self.bus = bus

951

1243

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

952

953

self._approvals_pending = 0

954

1244

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

955

1245

# the D-Bus

956

1246

client_object_name = unicode(self.name).translate(

960

1250

("/clients/" + client_object_name))

961

1251

DBusObjectWithProperties.__init__(self, self.bus,

962

1252

self.dbus_object_path)

963

1253

964

1254

def notifychangeproperty(transform_func,

965

1255

dbus_name, type_func=lambda x: x,

966

1256

variant_level=1):

967

1257

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

968

1258

its changes to DBus.

969

1259

970

1260

transform_fun: Function that takes a value and a variant_level

971

1261

and transforms it to a D-Bus type.

972

1262

dbus_name: D-Bus name of the variable

989

1279

990

1280

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

991

1281

992

993

1282

expires = notifychangeproperty(datetime_to_dbus, "Expires")

994

1283

approvals_pending = notifychangeproperty(dbus.Boolean,

995

1284

"ApprovalPending",

1002

1291

checker is not None)

1003

1292

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1004

1293

"LastCheckedOK")

1294

last_checker_status = notifychangeproperty(dbus.Int16,

1295

"LastCheckerStatus")

1005

1296

last_approval_request = notifychangeproperty(

1006

1297

datetime_to_dbus, "LastApprovalRequest")

1007

1298

approved_by_default = notifychangeproperty(dbus.Boolean,

1008

1299

"ApprovedByDefault")

1009

approval_delay = notifychangeproperty(dbus.UInt16,

1300

approval_delay = notifychangeproperty(dbus.UInt64,

1010

1301

"ApprovalDelay",

1011

1302

type_func =

1012

_timedelta_to_milliseconds)

1303

timedelta_to_milliseconds)

1013

1304

approval_duration = notifychangeproperty(

1014

dbus.UInt16, "ApprovalDuration",

1015

type_func = _timedelta_to_milliseconds)

1305

dbus.UInt64, "ApprovalDuration",

1306

type_func = timedelta_to_milliseconds)

1016

1307

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

1017

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

1308

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

1018

1309

type_func =

1019

_timedelta_to_milliseconds)

1310

timedelta_to_milliseconds)

1020

1311

extended_timeout = notifychangeproperty(

1021

dbus.UInt16, "ExtendedTimeout",

1022

type_func = _timedelta_to_milliseconds)

1023

interval = notifychangeproperty(dbus.UInt16,

1312

dbus.UInt64, "ExtendedTimeout",

1313

type_func = timedelta_to_milliseconds)

1314

interval = notifychangeproperty(dbus.UInt64,

1024

1315

"Interval",

1025

1316

type_func =

1026

_timedelta_to_milliseconds)

1317

timedelta_to_milliseconds)

1027

1318

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

1028

1319

1029

1320

del notifychangeproperty

1071

1362

return r

1072

1363

1073

1364

def _reset_approved(self):

1074

self._approved = None

1365

self.approved = None

1075

1366

return False

1076

1367

1077

1368

def approve(self, value=True):

1078

self.send_changedstate()

1079

self._approved = value

1080

gobject.timeout_add(_timedelta_to_milliseconds

1369

self.approved = value

1370

gobject.timeout_add(timedelta_to_milliseconds

1081

1371

(self.approval_duration),

1082

1372

self._reset_approved)

1083

1373

self.send_changedstate()

1084

1374

1085

1375

## D-Bus methods, signals & properties

1086

1376

_interface = "se.recompile.Mandos.Client"

1087

1377

1378

## Interfaces

1379

1380

@dbus_interface_annotations(_interface)

1381

def _foo(self):

1382

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

1383

"false"}

1384

1088

1385

## Signals

1089

1386

1090

1387

# CheckerCompleted - signal

1126

1423

"D-Bus signal"

1127

1424

return self.need_approval()

1128

1425

1129

# NeRwequest - signal

1130

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

1131

def NewRequest(self, ip):

1132

"""D-Bus signal

1133

Is sent after a client request a password.

1134

"""

1135

pass

1136

1137

1426

## Methods

1138

1427

1139

1428

# Approve - method

1197

1486

access="readwrite")

1198

1487

def ApprovalDuration_dbus_property(self, value=None):

1199

1488

if value is None: # get

1200

return dbus.UInt64(_timedelta_to_milliseconds(

1489

return dbus.UInt64(timedelta_to_milliseconds(

1201

1490

self.approval_duration))

1202

1491

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

1203

1492

1217

1506

def Host_dbus_property(self, value=None):

1218

1507

if value is None: # get

1219

1508

return dbus.String(self.host)

1220

self.host = value

1509

self.host = unicode(value)

1221

1510

1222

1511

# Created - property

1223

1512

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

1224

1513

def Created_dbus_property(self):

1225

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

1514

return datetime_to_dbus(self.created)

1226

1515

1227

1516

# LastEnabled - property

1228

1517

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

1249

1538

return

1250

1539

return datetime_to_dbus(self.last_checked_ok)

1251

1540

1541

# LastCheckerStatus - property

1542

@dbus_service_property(_interface, signature="n",

1543

access="read")

1544

def LastCheckerStatus_dbus_property(self):

1545

return dbus.Int16(self.last_checker_status)

1546

1252

1547

# Expires - property

1253

1548

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

1254

1549

def Expires_dbus_property(self):

1265

1560

def Timeout_dbus_property(self, value=None):

1266

1561

if value is None: # get

1267

1562

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1268

1564

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

1269

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

1270

return

1271

# Reschedule timeout

1272

gobject.source_remove(self.disable_initiator_tag)

1273

self.disable_initiator_tag = None

1274

self.expires = None

1275

time_to_die = _timedelta_to_milliseconds((self

1276

.last_checked_ok

1277

+ self.timeout)

1278

- datetime.datetime

1279

.utcnow())

1280

if time_to_die <= 0:

1281

# The timeout has passed

1282

self.disable()

1283

else:

1284

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

1285

+ datetime.timedelta(milliseconds =

1286

time_to_die))

1287

self.disable_initiator_tag = (gobject.timeout_add

1288

(time_to_die, self.disable))

1565

# Reschedule disabling

1566

if self.enabled:

1567

now = datetime.datetime.utcnow()

1568

self.expires += self.timeout - old_timeout

1569

if self.expires <= now:

1570

# The timeout has passed

1571

self.disable()

1572

else:

1573

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

1574

is None):

1575

return

1576

gobject.source_remove(self.disable_initiator_tag)

1577

self.disable_initiator_tag = (

1578

gobject.timeout_add(

1579

timedelta_to_milliseconds(self.expires - now),

1580

self.disable))

1289

1581

1290

1582

# ExtendedTimeout - property

1291

1583

@dbus_service_property(_interface, signature="t",

1304

1596

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

1305

1597

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

1306

1598

return

1307

# Reschedule checker run

1308

gobject.source_remove(self.checker_initiator_tag)

1309

self.checker_initiator_tag = (gobject.timeout_add

1310

(value, self.start_checker))

1311

self.start_checker() # Start one now, too

1599

if self.enabled:

1600

# Reschedule checker run

1601

gobject.source_remove(self.checker_initiator_tag)

1602

self.checker_initiator_tag = (gobject.timeout_add

1603

(value, self.start_checker))

1604

self.start_checker() # Start one now, too

1312

1605

1313

1606

# Checker - property

1314

1607

@dbus_service_property(_interface, signature="s",

1316

1609

def Checker_dbus_property(self, value=None):

1317

1610

if value is None: # get

1318

1611

return dbus.String(self.checker_command)

1319

self.checker_command = value

1612

self.checker_command = unicode(value)

1320

1613

1321

1614

# CheckerRunning - property

1322

1615

@dbus_service_property(_interface, signature="b",

1351

1644

raise KeyError()

1352

1645

1353

1646

def __getattribute__(self, name):

1354

if(name == '_pipe'):

1647

if name == '_pipe':

1355

1648

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

1356

1649

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

1357

1650

data = self._pipe.recv()

1364

1657

return func

1365

1658

1366

1659

def __setattr__(self, name, value):

1367

if(name == '_pipe'):

1660

if name == '_pipe':

1368

1661

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

1369

1662

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

1370

1663

1371

class ClientDBusTransitional(ClientDBus):

1372

__metaclass__ = AlternateDBusNamesMetaclass

1373

1664

1374

1665

class ClientHandler(socketserver.BaseRequestHandler, object):

1375

1666

"""A class to handle client connections.

1412

1703

logger.debug("Protocol version: %r", line)

1413

1704

try:

1414

1705

if int(line.strip().split()[0]) > 1:

1415

raise RuntimeError

1706

raise RuntimeError(line)

1416

1707

except (ValueError, IndexError, RuntimeError) as error:

1417

1708

logger.error("Unknown protocol version: %s", error)

1418

1709

return

1437

1728

logger.warning("Bad certificate: %s", error)

1438

1729

return

1439

1730

logger.debug("Fingerprint: %s", fpr)

1440

if self.server.use_dbus:

1441

# Emit D-Bus signal

1442

client.NewRequest(str(self.client_address))

1443

1731

1444

1732

try:

1445

1733

client = ProxyClient(child_pipe, fpr,

1461

1749

client.Rejected("Disabled")

1462

1750

return

1463

1751

1464

if client._approved or not client.approval_delay:

1752

if client.approved or not client.approval_delay:

1465

1753

#We are approved or approval is disabled

1466

1754

break

1467

elif client._approved is None:

1755

elif client.approved is None:

1468

1756

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

1469

1757

client.name)

1470

1758

if self.server.use_dbus:

1483

1771

#wait until timeout or approved

1484

1772

time = datetime.datetime.now()

1485

1773

client.changedstate.acquire()

1486

(client.changedstate.wait

1487

(float(client._timedelta_to_milliseconds(delay)

1488

/ 1000)))

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1489

1777

client.changedstate.release()

1490

1778

time2 = datetime.datetime.now()

1491

1779

if (time2 - time) >= delay:

1507

1795

try:

1508

1796

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

1509

1797

except gnutls.errors.GNUTLSError as error:

1510

logger.warning("gnutls send failed")

1798

logger.warning("gnutls send failed",

1799

exc_info=error)

1511

1800

return

1512

1801

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

1513

1802

sent, len(client.secret)

1516

1805

1517

1806

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

1518

1807

# bump the timeout using extended_timeout

1519

client.checked_ok(client.extended_timeout)

1808

client.bump_timeout(client.extended_timeout)

1520

1809

if self.server.use_dbus:

1521

1810

# Emit D-Bus signal

1522

1811

client.GotSecret()

1527

1816

try:

1528

1817

session.bye()

1529

1818

except gnutls.errors.GNUTLSError as error:

1530

logger.warning("GnuTLS bye failed")

1819

logger.warning("GnuTLS bye failed",

1820

exc_info=error)

1531

1821

1532

1822

@staticmethod

1533

1823

def peer_certificate(session):

1589

1879

# Convert the buffer to a Python bytestring

1590

1880

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

1591

1881

# Convert the bytestring to hexadecimal notation

1592

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

1882

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

1593

1883

return hex_fpr

1594

1884

1595

1885

1598

1888

def sub_process_main(self, request, address):

1599

1889

try:

1600

1890

self.finish_request(request, address)

1601

except:

1891

except Exception:

1602

1892

self.handle_error(request, address)

1603

1893

self.close_request(request)

1604

1894

1605

1895

def process_request(self, request, address):

1606

1896

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

1607

1897

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

1608

args = (request,

1609

address))

1898

args = (request, address))

1610

1899

proc.start()

1611

1900

return proc

1612

1901

1627

1916

1628

1917

def add_pipe(self, parent_pipe, proc):

1629

1918

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

1630

raise NotImplementedError

1919

raise NotImplementedError()

1631

1920

1632

1921

1633

1922

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1640

1929

use_ipv6: Boolean; to use IPv6 or not

1641

1930

"""

1642

1931

def __init__(self, server_address, RequestHandlerClass,

1643

interface=None, use_ipv6=True):

1932

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

1933

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

1934

creating a new one with socket.socket().

1935

"""

1644

1936

self.interface = interface

1645

1937

if use_ipv6:

1646

1938

self.address_family = socket.AF_INET6

1939

if socketfd is not None:

1940

# Save the file descriptor

1941

self.socketfd = socketfd

1942

# Save the original socket.socket() function

1943

self.socket_socket = socket.socket

1944

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

1945

#

1946

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

1947

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

1948

# patching socket.socket.)

1949

#

1950

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

1951

@functools.wraps(socket.socket)

1952

def socket_wrapper(*args, **kwargs):

1953

# Restore original function so subsequent calls are

1954

# not affected.

1955

socket.socket = self.socket_socket

1956

del self.socket_socket

1957

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

1958

# saved file descriptor.

1959

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

1960

# Replace socket.socket() function with wrapper

1961

socket.socket = socket_wrapper

1962

# The socketserver.TCPServer.__init__ will call

1963

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

1964

# socket_wrapper(), if socketfd was set.

1647

1965

socketserver.TCPServer.__init__(self, server_address,

1648

1966

RequestHandlerClass)

1967

1649

1968

def server_bind(self):

1650

1969

"""This overrides the normal server_bind() function

1651

1970

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

1659

1978

try:

1660

1979

self.socket.setsockopt(socket.SOL_SOCKET,

1661

1980

SO_BINDTODEVICE,

1662

str(self.interface

1663

+ '\0'))

1981

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

1664

1982

except socket.error as error:

1665

if error[0] == errno.EPERM:

1666

logger.error("No permission to"

1667

" bind to interface %s",

1668

self.interface)

1669

elif error[0] == errno.ENOPROTOOPT:

1983

if error.errno == errno.EPERM:

1984

logger.error("No permission to bind to"

1985

" interface %s", self.interface)

1986

elif error.errno == errno.ENOPROTOOPT:

1670

1987

logger.error("SO_BINDTODEVICE not available;"

1671

1988

" cannot bind to interface %s",

1672

1989

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

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

1992

" cannot bind", self.interface)

1673

1993

else:

1674

1994

raise

1675

1995

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

1678

1998

if self.address_family == socket.AF_INET6:

1679

1999

any_address = "::" # in6addr_any

1680

2000

else:

1681

any_address = socket.INADDR_ANY

2001

any_address = "0.0.0.0" # INADDR_ANY

1682

2002

self.server_address = (any_address,

1683

2003

self.server_address[1])

1684

2004

elif not self.server_address[1]:

1705

2025

"""

1706

2026

def __init__(self, server_address, RequestHandlerClass,

1707

2027

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

1708

gnutls_priority=None, use_dbus=True):

2028

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

1709

2029

self.enabled = False

1710

2030

self.clients = clients

1711

2031

if self.clients is None:

1715

2035

IPv6_TCPServer.__init__(self, server_address,

1716

2036

RequestHandlerClass,

1717

2037

interface = interface,

1718

use_ipv6 = use_ipv6)

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1719

2040

def server_activate(self):

1720

2041

if self.enabled:

1721

2042

return socketserver.TCPServer.server_activate(self)

1734

2055

1735

2056

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

1736

2057

proc = None, client_object=None):

1737

condition_names = {

1738

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

1739

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

1740

# blocking).

1741

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

1742

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

1743

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

1744

# broken, usually for pipes and

1745

# sockets).

1746

}

1747

conditions_string = ' | '.join(name

1748

for cond, name in

1749

condition_names.iteritems()

1750

if cond & condition)

1751

2058

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

1752

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

2059

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

1753

2060

# Wait for other process to exit

1754

2061

proc.join()

1755

2062

return False

1813

2120

return True

1814

2121

1815

2122

2123

def rfc3339_duration_to_delta(duration):

2124

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

2125

2126

>>> rfc3339_duration_to_delta("P7D")

2127

datetime.timedelta(7)

2128

>>> rfc3339_duration_to_delta("PT60S")

2129

datetime.timedelta(0, 60)

2130

>>> rfc3339_duration_to_delta("PT60M")

2131

datetime.timedelta(0, 3600)

2132

>>> rfc3339_duration_to_delta("PT24H")

2133

datetime.timedelta(1)

2134

>>> rfc3339_duration_to_delta("P1W")

2135

datetime.timedelta(7)

2136

>>> rfc3339_duration_to_delta("PT5M30S")

2137

datetime.timedelta(0, 330)

2138

>>> rfc3339_duration_to_delta("P1DT3M20S")

2139

datetime.timedelta(1, 200)

2140

"""

2141

2142

# Parsing an RFC 3339 duration with regular expressions is not

2143

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

2144

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

2145

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

2146

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

2147

# avoid excessive use of external libraries.

2148

2149

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

2150

Token = collections.namedtuple("Token",

2151

("regexp", # To match token; if

2152

# "value" is not None,

2153

# must have a "group"

2154

# containing digits

2155

"value", # datetime.timedelta or

2156

# None

2157

"followers")) # Tokens valid after

2158

# this token

2159

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

2160

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

2161

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

2162

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

2163

datetime.timedelta(seconds=1),

2164

frozenset((token_end,)))

2165

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

2166

datetime.timedelta(minutes=1),

2167

frozenset((token_second, token_end)))

2168

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

2169

datetime.timedelta(hours=1),

2170

frozenset((token_minute, token_end)))

2171

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

2172

None,

2173

frozenset((token_hour, token_minute,

2174

token_second)))

2175

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

2176

datetime.timedelta(days=1),

2177

frozenset((token_time, token_end)))

2178

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

2179

datetime.timedelta(weeks=4),

2180

frozenset((token_day, token_end)))

2181

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

2182

datetime.timedelta(weeks=52),

2183

frozenset((token_month, token_end)))

2184

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

2185

datetime.timedelta(weeks=1),

2186

frozenset((token_end,)))

2187

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

2188

frozenset((token_year, token_month,

2189

token_day, token_time,

2190

token_week))),

2191

# Define starting values

2192

value = datetime.timedelta() # Value so far

2193

found_token = None

2194

followers = frozenset(token_duration,) # Following valid tokens

2195

s = duration # String left to parse

2196

# Loop until end token is found

2197

while found_token is not token_end:

2198

# Search for any currently valid tokens

2199

for token in followers:

2200

match = token.regexp.match(s)

2201

if match is not None:

2202

# Token found

2203

if token.value is not None:

2204

# Value found, parse digits

2205

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

2206

# Add to value so far

2207

value += factor * token.value

2208

# Strip token from string

2209

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

2210

# Go to found token

2211

found_token = token

2212

# Set valid next tokens

2213

followers = found_token.followers

2214

break

2215

else:

2216

# No currently valid tokens were found

2217

raise ValueError("Invalid RFC 3339 duration")

2218

# End token found

2219

return value

2220

2221

1816

2222

def string_to_delta(interval):

1817

2223

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

1818

2224

1829

2235

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

1830

2236

datetime.timedelta(0, 330)

1831

2237

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

1832

2244

timevalue = datetime.timedelta(0)

1833

2245

for s in interval.split():

1834

2246

try:

1845

2257

elif suffix == "w":

1846

2258

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

1847

2259

else:

1848

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

1849

except (ValueError, IndexError) as e:

2260

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

2261

.format(suffix))

2262

except IndexError as e:

1850

2263

raise ValueError(*(e.args))

1851

2264

timevalue += delta

1852

2265

return timevalue

1853

2266

1854

2267

1855

def if_nametoindex(interface):

1856

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

1857

1858

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

1859

global if_nametoindex

1860

try:

1861

if_nametoindex = (ctypes.cdll.LoadLibrary

1862

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

1863

.if_nametoindex)

1864

except (OSError, AttributeError):

1865

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

1866

def if_nametoindex(interface):

1867

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

1868

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

1869

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

1870

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1871

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

1872

interface))

1873

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

1874

ifreq[16:20])[0]

1875

return interface_index

1876

return if_nametoindex(interface)

1877

1878

1879

2268

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

1880

2269

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

1881

2270

1889

2278

sys.exit()

1890

2279

if not noclose:

1891

2280

# Close all standard open file descriptors

1892

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

2281

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

1893

2282

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

1894

2283

raise OSError(errno.ENODEV,

1895

"%s not a character device"

1896

% os.path.devnull)

2284

"{0} not a character device"

2285

.format(os.devnull))

1897

2286

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

1898

2287

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

1899

2288

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

1908

2297

1909

2298

parser = argparse.ArgumentParser()

1910

2299

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

1911

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

2300

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

1912

2301

help="show version number and exit")

1913

2302

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

1914

2303

help="Bind to interface IF")

1920

2309

help="Run self-test")

1921

2310

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

1922

2311

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

1923

" to terminal")

2312

" to terminal", default=None)

1924

2313

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

1925

2314

help="Debug level for stdout output")

1926

2315

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

1933

2322

" files")

1934

2323

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

1935

2324

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

1936

" system bus interface")

2325

" system bus interface", default=None)

1937

2326

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

1938

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

2327

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

2328

default=None)

1939

2329

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

1940

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

1941

default=True)

1942

2330

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

2331

" state", default=None)

2332

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

2333

help="Specify a file descriptor to a network"

2334

" socket to use instead of creating one")

2335

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

2336

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

2337

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

2338

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

2339

1943

2340

options = parser.parse_args()

1944

2341

1945

2342

if options.check:

1953

2350

"port": "",

1954

2351

"debug": "False",

1955

2352

"priority":

1956

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

2353

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:+SIGN-RSA-SHA224:+SIGN-RSA-RMD160",

1957

2354

"servicename": "Mandos",

1958

2355

"use_dbus": "True",

1959

2356

"use_ipv6": "True",

1960

2357

"debuglevel": "",

2358

"restore": "True",

2359

"socket": "",

2360

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

2361

"foreground": "False",

1961

2362

}

1962

2363

1963

2364

# Parse config file for server-global settings

1968

2369

# Convert the SafeConfigParser object to a dict

1969

2370

server_settings = server_config.defaults()

1970

2371

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

1971

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

2372

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

1972

2373

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

1973

2374

option)

1974

2375

if server_settings["port"]:

1975

2376

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

1976

2377

"port")

2378

if server_settings["socket"]:

2379

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

2380

"socket")

2381

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

2382

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

2383

# happen with a supplied network socket.

2384

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

2385

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

2386

["socket"])

1977

2387

del server_config

1978

2388

1979

2389

# Override the settings from the config file with command line

1980

2390

# options, if set.

1981

2391

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

1982

2392

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

1983

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

2393

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

2394

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

1984

2395

value = getattr(options, option)

1985

2396

if value is not None:

1986

2397

server_settings[option] = value

1989

2400

for option in server_settings.keys():

1990

2401

if type(server_settings[option]) is str:

1991

2402

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

2403

# Force all boolean options to be boolean

2404

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

2405

"foreground"):

2406

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

2407

# Debug implies foreground

2408

if server_settings["debug"]:

2409

server_settings["foreground"] = True

1992

2410

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

1993

2411

1994

2412

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

1998

2416

debuglevel = server_settings["debuglevel"]

1999

2417

use_dbus = server_settings["use_dbus"]

2000

2418

use_ipv6 = server_settings["use_ipv6"]

2419

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

2420

stored_state_file)

2421

foreground = server_settings["foreground"]

2001

2422

2002

2423

if debug:

2003

initlogger(logging.DEBUG)

2424

initlogger(debug, logging.DEBUG)

2004

2425

else:

2005

2426

if not debuglevel:

2006

initlogger()

2427

initlogger(debug)

2007

2428

else:

2008

2429

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

2009

initlogger(level)

2430

initlogger(debug, level)

2010

2431

2011

2432

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

2012

2433

syslogger.setFormatter(logging.Formatter

2013

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

2014

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

2015

% server_settings["servicename"]))

2434

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

2435

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

2436

.format(server_settings

2437

["servicename"])))

2016

2438

2017

2439

# Parse config file with clients

2018

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

2019

"extended_timeout": "15m",

2020

"interval": "2m",

2021

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

2022

"host": "",

2023

"approval_delay": "0s",

2024

"approval_duration": "1s",

2025

}

2026

client_config = configparser.SafeConfigParser(client_defaults)

2440

client_config = configparser.SafeConfigParser(Client

2441

.client_defaults)

2027

2442

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

2028

2443

"clients.conf"))

2029

2444

2038

2453

use_ipv6=use_ipv6,

2039

2454

gnutls_priority=

2040

2455

server_settings["priority"],

2041

use_dbus=use_dbus)

2042

if not debug:

2043

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

2456

use_dbus=use_dbus,

2457

socketfd=(server_settings["socket"]

2458

or None))

2459

if not foreground:

2460

pidfilename = "/run/mandos.pid"

2461

if not os.path.isdir("/run/."):

2462

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

2463

pidfile = None

2044

2464

try:

2045

2465

pidfile = open(pidfilename, "w")

2046

except IOError:

2047

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

2466

except IOError as e:

2467

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

2468

exc_info=e)

2048

2469

2049

try:

2050

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

2051

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

2052

except KeyError:

2470

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

2053

2471

try:

2054

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

2055

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

2472

uid = pwd.getpwnam(name).pw_uid

2473

gid = pwd.getpwnam(name).pw_gid

2474

break

2056

2475

except KeyError:

2057

try:

2058

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

2059

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

2060

except KeyError:

2061

uid = 65534

2062

gid = 65534

2476

continue

2477

else:

2478

uid = 65534

2479

gid = 65534

2063

2480

try:

2064

2481

os.setgid(gid)

2065

2482

os.setuid(uid)

2066

2483

except OSError as error:

2067

if error[0] != errno.EPERM:

2068

raise error

2484

if error.errno != errno.EPERM:

2485

raise

2069

2486

2070

2487

if debug:

2071

2488

# Enable all possible GnuTLS debugging

2082

2499

.gnutls_global_set_log_function(debug_gnutls))

2083

2500

2084

2501

# Redirect stdin so all checkers get /dev/null

2085

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

2502

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

2086

2503

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

2087

2504

if null > 2:

2088

2505

os.close(null)

2089

else:

2090

# No console logging

2091

logger.removeHandler(console)

2092

2506

2093

2507

# Need to fork before connecting to D-Bus

2094

if not debug:

2508

if not foreground:

2095

2509

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

2096

2510

daemon()

2097

2511

2512

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

2513

# need to inform gobject that threads will be used.

2514

gobject.threads_init()

2515

2098

2516

global main_loop

2099

2517

# From the Avahi example code

2100

DBusGMainLoop(set_as_default=True )

2518

DBusGMainLoop(set_as_default=True)

2101

2519

main_loop = gobject.MainLoop()

2102

2520

bus = dbus.SystemBus()

2103

2521

# End of Avahi example code

2109

2527

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

2110

2528

do_not_queue=True))

2111

2529

except dbus.exceptions.NameExistsException as e:

2112

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

2530

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

2113

2531

use_dbus = False

2114

2532

server_settings["use_dbus"] = False

2115

2533

tcp_server.use_dbus = False

2127

2545

2128

2546

client_class = Client

2129

2547

if use_dbus:

2130

client_class = functools.partial(ClientDBusTransitional,

2131

bus = bus)

2132

2133

special_settings = {

2134

# Some settings need to be accessd by special methods;

2135

# booleans need .getboolean(), etc. Here is a list of them:

2136

"approved_by_default":

2137

lambda section:

2138

client_config.getboolean(section, "approved_by_default"),

2139

}

2140

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

2141

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

2142

# with exceptions for any special settings as defined above

2143

client_settings = dict((clientname,

2144

dict((setting,

2145

(value if setting not in special_settings

2146

else special_settings[setting](clientname)))

2147

for setting, value in client_config.items(clientname)))

2148

for clientname in client_config.sections())

2149

2548

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

2549

2550

client_settings = Client.config_parser(client_config)

2150

2551

old_client_settings = {}

2151

clients_data = []

2152

2153

# Get client data and settings from last running state.

2552

clients_data = {}

2553

2554

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

2555

global wnull

2556

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

2557

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

2558

# mode

2559

if debug or not foreground:

2560

wnull.close()

2561

2562

# Get client data and settings from last running state.

2154

2563

if server_settings["restore"]:

2155

2564

try:

2156

2565

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

2157

clients_data, old_client_settings = pickle.load(stored_state)

2566

clients_data, old_client_settings = (pickle.load

2567

(stored_state))

2158

2568

os.remove(stored_state_path)

2159

2569

except IOError as e:

2160

logger.warning("Could not load persistant state: {0}".format(e))

2161

if e.errno != errno.ENOENT:

2570

if e.errno == errno.ENOENT:

2571

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

2572

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

2573

else:

2574

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

2575

exc_info=e)

2162

2576

raise

2163

2164

for client in clients_data:

2165

client_name = client["name"]

2166

2167

# Decide which value to use after restoring saved state.

2168

# We have three different values: Old config file,

2169

# new config file, and saved state.

2170

# New config value takes precedence if it differs from old

2171

# config value, otherwise use saved state.

2172

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

2577

except EOFError as e:

2578

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

2579

"EOFError:", exc_info=e)

2580

2581

with PGPEngine() as pgp:

2582

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2587

# Decide which value to use after restoring saved state.

2588

# We have three different values: Old config file,

2589

# new config file, and saved state.

2590

# New config value takes precedence if it differs from old

2591

# config value, otherwise use saved state.

2592

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

2593

try:

2594

# For each value in new config, check if it

2595

# differs from the old config value (Except for

2596

# the "secret" attribute)

2597

if (name != "secret" and

2598

value != old_client_settings[client_name]

2599

[name]):

2600

client[name] = value

2601

except KeyError:

2602

pass

2603

2604

# Clients who has passed its expire date can still be

2605

# enabled if its last checker was successful. Clients

2606

# whose checker succeeded before we stored its state is

2607

# assumed to have successfully run all checkers during

2608

# downtime.

2609

if client["enabled"]:

2610

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

2611

if not client["last_checked_ok"]:

2612

logger.warning(

2613

"disabling client {0} - Client never "

2614

"performed a successful checker"

2615

.format(client_name))

2616

client["enabled"] = False

2617

elif client["last_checker_status"] != 0:

2618

logger.warning(

2619

"disabling client {0} - Client "

2620

"last checker failed with error code {1}"

2621

.format(client_name,

2622

client["last_checker_status"]))

2623

client["enabled"] = False

2624

else:

2625

client["expires"] = (datetime.datetime

2626

.utcnow()

2627

+ client["timeout"])

2628

logger.debug("Last checker succeeded,"

2629

" keeping {0} enabled"

2630

.format(client_name))

2173

2631

try:

2174

# For each value in new config, check if it differs

2175

# from the old config value (Except for the "secret"

2176

# attribute)

2177

if name != "secret" and value != old_client_settings[client_name][name]:

2178

setattr(client, name, value)

2179

except KeyError:

2180

pass

2181

2182

# Clients who has passed its expire date, can still be enabled if its

2183

# last checker was sucessful. Clients who checkers failed before we

2184

# stored it state is asumed to had failed checker during downtime.

2185

if client["enabled"] and client["last_checked_ok"]:

2186

if ((datetime.datetime.utcnow() - client["last_checked_ok"])

2187

> client["interval"]):

2188

if client["last_checker_status"] != 0:

2189

client["enabled"] = False

2190

else:

2191

client["expires"] = datetime.datetime.utcnow() + client["timeout"]

2192

2193

client["changedstate"] = (multiprocessing_manager

2194

.Condition(multiprocessing_manager

2195

.Lock()))

2196

if use_dbus:

2197

new_client = ClientDBusTransitional.__new__(ClientDBusTransitional)

2198

tcp_server.clients[client_name] = new_client

2199

new_client.bus = bus

2200

for name, value in client.iteritems():

2201

setattr(new_client, name, value)

2202

client_object_name = unicode(client_name).translate(

2203

{ord("."): ord("_"),

2204

ord("-"): ord("_")})

2205

new_client.dbus_object_path = (dbus.ObjectPath

2206

("/clients/" + client_object_name))

2207

DBusObjectWithProperties.__init__(new_client,

2208

new_client.bus,

2209

new_client.dbus_object_path)

2210

else:

2211

tcp_server.clients[client_name] = Client.__new__(Client)

2212

for name, value in client.iteritems():

2213

setattr(tcp_server.clients[client_name], name, value)

2214

2215

tcp_server.clients[client_name].decrypt_secret(

2216

client_settings[client_name]["secret"])

2217

2218

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

2219

for clientname in set(old_client_settings) - set(client_settings):

2220

del tcp_server.clients[clientname]

2221

for clientname in set(client_settings) - set(old_client_settings):

2222

tcp_server.clients[clientname] = (client_class(name = clientname,

2223

config =

2224

client_settings

2225

[clientname]))

2226

2227

2632

client["secret"] = (

2633

pgp.decrypt(client["encrypted_secret"],

2634

client_settings[client_name]

2635

["secret"]))

2636

except PGPError:

2637

# If decryption fails, we use secret from new settings

2638

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

2639

.format(client_name))

2640

client["secret"] = (

2641

client_settings[client_name]["secret"])

2642

2643

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

2644

for client_name in (set(old_client_settings)

2645

- set(client_settings)):

2646

del clients_data[client_name]

2647

for client_name in (set(client_settings)

2648

- set(old_client_settings)):

2649

clients_data[client_name] = client_settings[client_name]

2650

2651

# Create all client objects

2652

for client_name, client in clients_data.iteritems():

2653

tcp_server.clients[client_name] = client_class(

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2656

2228

2657

if not tcp_server.clients:

2229

2658

logger.warning("No clients defined")

2230

2231

if not debug:

2232

try:

2233

with pidfile:

2234

pid = os.getpid()

2235

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

2236

del pidfile

2237

except IOError:

2238

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

2239

pidfilename, pid)

2240

except NameError:

2241

# "pidfile" was never created

2242

pass

2659

2660

if not foreground:

2661

if pidfile is not None:

2662

try:

2663

with pidfile:

2664

pid = os.getpid()

2665

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

2666

except IOError:

2667

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

2668

pidfilename, pid)

2669

del pidfile

2243

2670

del pidfilename

2244

2245

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

2246

2671

2247

2672

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

2248

2673

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

2249

2674

2250

2675

if use_dbus:

2251

class MandosDBusService(dbus.service.Object):

2676

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

2677

"se.bsnet.fukt.Mandos"})

2678

class MandosDBusService(DBusObjectWithProperties):

2252

2679

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

2253

2680

def __init__(self):

2254

2681

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

2255

2682

_interface = "se.recompile.Mandos"

2256

2683

2684

@dbus_interface_annotations(_interface)

2685

def _foo(self):

2686

return { "org.freedesktop.DBus.Property"

2687

".EmitsChangedSignal":

2688

"false"}

2689

2257

2690

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

2258

2691

def ClientAdded(self, objpath):

2259

2692

"D-Bus signal"

2301

2734

2302

2735

del _interface

2303

2736

2304

class MandosDBusServiceTransitional(MandosDBusService):

2305

__metaclass__ = AlternateDBusNamesMetaclass

2306

mandos_dbus_service = MandosDBusServiceTransitional()

2737

mandos_dbus_service = MandosDBusService()

2307

2738

2308

2739

def cleanup():

2309

2740

"Cleanup function; run on exit"

2310

2741

service.cleanup()

2311

2742

2312

2743

multiprocessing.active_children()

2744

wnull.close()

2313

2745

if not (tcp_server.clients or client_settings):

2314

2746

return

2315

2316

# Store client before exiting. Secrets are encrypted with key based

2317

# on what config file has. If config file is removed/edited, old

2318

# secret will thus be unrecovable.

2319

clients = []

2320

for client in tcp_server.clients.itervalues():

2321

client.encrypt_secret(client_settings[client.name]["secret"])

2322

2323

client_dict = {}

2324

2325

# A list of attributes that will not be stored when shuting down.

2326

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

2327

for name, typ in inspect.getmembers(dbus.service.Object):

2328

exclude.add(name)

2329

2330

client_dict["encrypted_secret"] = client.encrypted_secret

2331

for attr in client.client_structure:

2332

if attr not in exclude:

2333

client_dict[attr] = getattr(client, attr)

2334

2335

clients.append(client_dict)

2336

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

2337

2747

2748

# Store client before exiting. Secrets are encrypted with key

2749

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

2750

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

2751

clients = {}

2752

with PGPEngine() as pgp:

2753

for client in tcp_server.clients.itervalues():

2754

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

2755

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

2756

key)

2757

client_dict = {}

2758

2759

# A list of attributes that can not be pickled

2760

# + secret.

2761

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

2762

"checker", "server_settings"))

2763

for name, typ in (inspect.getmembers

2764

(dbus.service.Object)):

2765

exclude.add(name)

2766

2767

client_dict["encrypted_secret"] = (client

2768

.encrypted_secret)

2769

for attr in client.client_structure:

2770

if attr not in exclude:

2771

client_dict[attr] = getattr(client, attr)

2772

2773

clients[client.name] = client_dict

2774

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

2775

2338

2776

try:

2339

with os.fdopen(os.open(stored_state_path, os.O_CREAT|os.O_WRONLY|os.O_TRUNC, 0600), "wb") as stored_state:

2777

with (tempfile.NamedTemporaryFile

2778

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

2779

dir=os.path.dirname(stored_state_path),

2780

delete=False)) as stored_state:

2340

2781

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

2341

except IOError as e:

2342

logger.warning("Could not save persistant state: {0}".format(e))

2343

if e.errno != errno.ENOENT:

2782

tempname=stored_state.name

2783

os.rename(tempname, stored_state_path)

2784

except (IOError, OSError) as e:

2785

if not debug:

2786

try:

2787

os.remove(tempname)

2788

except NameError:

2789

pass

2790

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

2791

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

2792

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

2793

else:

2794

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

2795

exc_info=e)

2344

2796

raise

2345

2797

2346

2798

# Delete all clients, and settings from config

2347

2799

while tcp_server.clients:

2348

2800

name, client = tcp_server.clients.popitem()

2366

2818

# Need to initiate checking of clients

2367

2819

if client.enabled:

2368

2820

client.init_checker()

2369

2370

2821

2371

2822

tcp_server.enable()

2372

2823

tcp_server.server_activate()

2375

2826

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

2376

2827

if use_ipv6:

2377

2828

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

2378

" flowinfo %d, scope_id %d"

2379

% tcp_server.socket.getsockname())

2829

" flowinfo %d, scope_id %d",

2830

*tcp_server.socket.getsockname())

2380

2831

else: # IPv4

2381

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

2382

% tcp_server.socket.getsockname())

2832

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

2833

*tcp_server.socket.getsockname())

2383

2834

2384

2835

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

2385

2836

2388

2839

try:

2389

2840

service.activate()

2390

2841

except dbus.exceptions.DBusException as error:

2391

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

2842

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

2392

2843

cleanup()

2393

2844

sys.exit(1)

2394

2845

# End of Avahi example code

2401

2852

logger.debug("Starting main loop")

2402

2853

main_loop.run()

2403

2854

except AvahiError as error:

2404

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

2855

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

2405

2856

cleanup()

2406

2857

sys.exit(1)

2407

2858

except KeyboardInterrupt:

2412

2863

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

2413

2864

cleanup()

2414

2865

2415

2416

2866

if __name__ == '__main__':

2417

2867

main()