/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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version = "1.6.2"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(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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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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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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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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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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self.name = name

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if config is None:

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config = {}

532

if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

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553

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

366

(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

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

373

self.created = datetime.datetime.utcnow()

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self.enabled = True

375

self.last_approval_request = None

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self.last_enabled = datetime.datetime.utcnow()

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self.last_checked_ok = None

378

self.last_checker_status = None

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

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self.extended_timeout = string_to_delta(config

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["extended_timeout"])

382

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

554

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

555

datetime.datetime.utcnow())

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

386

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

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

389

562

self.current_checker_command = None

390

self._approved = None

391

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

392

True)

563

self.approved = None

393

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self.approvals_pending = 0

394

self.approval_delay = string_to_delta(

395

config["approval_delay"])

396

self.approval_duration = string_to_delta(

397

config["approval_duration"])

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565

self.changedstate = (multiprocessing_manager

399

566

.Condition(multiprocessing_manager

400

567

.Lock()))

401

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("_")]

402

571

self.client_structure.append("client_structure")

403

404

572

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

406

lambda obj: isinstance(obj, property)):

574

lambda obj:

575

isinstance(obj,

576

property)):

407

577

if not name.startswith("_"):

408

578

self.client_structure.append(name)

409

579

417

587

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

418

588

# Already enabled

419

589

return

420

self.send_changedstate()

421

590

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

422

591

self.enabled = True

423

592

self.last_enabled = datetime.datetime.utcnow()

424

593

self.init_checker()

594

self.send_changedstate()

425

595

426

596

def disable(self, quiet=True):

427

597

"""Disable this client."""

428

598

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

429

599

return False

430

600

if not quiet:

431

self.send_changedstate()

432

if not quiet:

433

601

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

434

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

602

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

435

603

gobject.source_remove(self.disable_initiator_tag)

436

604

self.disable_initiator_tag = None

437

605

self.expires = None

438

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

606

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

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607

gobject.source_remove(self.checker_initiator_tag)

440

608

self.checker_initiator_tag = None

441

609

self.stop_checker()

442

610

self.enabled = False

611

if not quiet:

612

self.send_changedstate()

443

613

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

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614

return False

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615

446

616

def __del__(self):

447

617

self.disable()

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619

def init_checker(self):

450

620

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

451

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# and every interval from then on.

622

if self.checker_initiator_tag is not None:

623

gobject.source_remove(self.checker_initiator_tag)

452

624

self.checker_initiator_tag = (gobject.timeout_add

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625

(self.interval_milliseconds(),

454

626

self.start_checker))

455

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

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

456

630

self.disable_initiator_tag = (gobject.timeout_add

457

631

(self.timeout_milliseconds(),

458

632

self.disable))

459

633

# Also start a new checker *right now*.

460

634

self.start_checker()

461

462

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636

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

464

637

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

465

638

self.checker_callback_tag = None

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639

self.checker = None

467

640

if os.WIFEXITED(condition):

468

self.last_checker_status = os.WEXITSTATUS(condition)

641

self.last_checker_status = os.WEXITSTATUS(condition)

469

642

if self.last_checker_status == 0:

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643

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

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644

vars(self))

478

651

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

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652

vars(self))

480

653

481

def checked_ok(self, timeout=None):

482

"""Bump up the timeout for this client.

483

484

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

485

alive and well.

486

"""

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."""

487

662

if timeout is None:

488

663

timeout = self.timeout

489

self.last_checked_ok = datetime.datetime.utcnow()

490

664

if self.disable_initiator_tag is not None:

491

665

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

492

667

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

493

668

self.disable_initiator_tag = (gobject.timeout_add

494

(_timedelta_to_milliseconds

669

(timedelta_to_milliseconds

495

670

(timeout), self.disable))

496

671

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

497

672

504

679

If a checker already exists, leave it running and do

505

680

nothing."""

506

681

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

507

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

508

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

509

# client would inevitably timeout, since no checker would get

510

# 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

511

686

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

512

687

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

513

688

# should be.

515

690

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

516

691

try:

517

692

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

518

except (AttributeError, OSError) as error:

519

if (isinstance(error, OSError)

520

and error.errno != errno.ECHILD):

521

raise error

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

522

698

else:

523

699

if pid:

524

700

logger.warning("Checker was a zombie")

527

703

self.current_checker_command)

528

704

# Start a new checker if needed

529

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)

530

711

try:

531

# In case checker_command has exactly one % operator

532

command = self.checker_command % self.host

533

except TypeError:

534

# Escape attributes for the shell

535

escaped_attrs = dict(

536

(attr,

537

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

538

errors=

539

'replace')))

540

for attr in

541

self.runtime_expansions)

542

543

try:

544

command = self.checker_command % escaped_attrs

545

except TypeError as error:

546

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

547

' %s', self.checker_command, error)

548

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

549

717

self.current_checker_command = command

550

718

try:

551

719

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

554

722

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

555

723

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

556

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 })

557

733

self.checker = subprocess.Popen(command,

558

734

close_fds=True,

559

shell=True, cwd="/")

560

self.checker_callback_tag = (gobject.child_watch_add

561

(self.checker.pid,

562

self.checker_callback,

563

data=command))

564

# The checker may have completed before the gobject

565

# 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:

566

748

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

567

if pid:

568

gobject.source_remove(self.checker_callback_tag)

569

self.checker_callback(pid, status, command)

570

749

except OSError as error:

571

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

572

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)

573

759

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

574

760

return True

575

761

582

768

return

583

769

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

584

770

try:

585

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

771

self.checker.terminate()

586

772

#time.sleep(0.5)

587

773

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

588

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

774

# self.checker.kill()

589

775

except OSError as error:

590

776

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

591

777

raise

592

778

self.checker = None

593

779

594

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

595

def encrypt_secret(self, key):

596

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

597

hasheng = hashlib.sha256()

598

hasheng.update(key)

599

encryptionkey = hasheng.digest()

600

601

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

602

hasheng = hashlib.sha256()

603

hasheng.update(self.secret)

604

validationhash = hasheng.digest()

605

606

# Encrypt secret

607

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

608

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

609

Crypto.Cipher.AES.MODE_CFB, iv)

610

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

611

self.encrypted_secret = (ciphertext, iv)

612

613

# Decrypt a encrypted client secret

614

def decrypt_secret(self, key):

615

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

616

hasheng = hashlib.sha256()

617

hasheng.update(key)

618

encryptionkey = hasheng.digest()

619

620

# Decrypt encrypted secret

621

ciphertext, iv = self.encrypted_secret

622

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

623

Crypto.Cipher.AES.MODE_CFB, iv)

624

plain = ciphereng.decrypt(ciphertext)

625

626

# Validate decrypted secret to know if it was succesful

627

hasheng = hashlib.sha256()

628

validationhash = plain[:hasheng.digest_size]

629

secret = plain[hasheng.digest_size:]

630

hasheng.update(secret)

631

632

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

633

# the decrypted secret

634

if hasheng.digest() == validationhash:

635

self.secret = secret

636

else:

637

self.secret = key

638

del self.encrypted_secret

639

640

780

641

781

def dbus_service_property(dbus_interface, signature="v",

642

782

access="readwrite", byte_arrays=False):

654

794

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

655

795

if byte_arrays and signature != "ay":

656

796

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

657

" signature %r" % signature)

797

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

658

798

def decorator(func):

659

799

func._dbus_is_property = True

660

800

func._dbus_interface = dbus_interface

668

808

return decorator

669

809

670

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

671

848

class DBusPropertyException(dbus.exceptions.DBusException):

672

849

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

673

850

"""

696

873

"""

697

874

698

875

@staticmethod

699

def _is_dbus_property(obj):

700

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)

701

884

702

def _get_all_dbus_properties(self):

885

def _get_all_dbus_things(self, thing):

703

886

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

704

887

"""

705

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

888

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

889

name),

890

athing.__get__(self))

706

891

for cls in self.__class__.__mro__

707

for name, prop in

708

inspect.getmembers(cls, self._is_dbus_property))

892

for name, athing in

893

inspect.getmembers(cls,

894

self._is_dbus_thing(thing)))

709

895

710

896

def _get_dbus_property(self, interface_name, property_name):

711

897

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

713

899

"""

714

900

for cls in self.__class__.__mro__:

715

901

for name, value in (inspect.getmembers

716

(cls, self._is_dbus_property)):

902

(cls,

903

self._is_dbus_thing("property"))):

717

904

if (value._dbus_name == property_name

718

905

and value._dbus_interface == interface_name):

719

906

return value.__get__(self)

748

935

# signatures other than "ay".

749

936

if prop._dbus_signature != "ay":

750

937

raise ValueError

751

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

752

for byte in value))

938

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

939

for byte in value))

753

940

prop(value)

754

941

755

942

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

760

947

761

948

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

762

949

"""

763

all = {}

764

for name, prop in self._get_all_dbus_properties():

950

properties = {}

951

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

765

952

if (interface_name

766

953

and interface_name != prop._dbus_interface):

767

954

# Interface non-empty but did not match

771

958

continue

772

959

value = prop()

773

960

if not hasattr(value, "variant_level"):

774

all[name] = value

961

properties[name] = value

775

962

continue

776

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

777

value.variant_level+1)

778

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")

779

966

780

967

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

781

968

out_signature="s",

782

969

path_keyword='object_path',

783

970

connection_keyword='connection')

784

971

def Introspect(self, object_path, connection):

785

"""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.

786

975

"""

787

976

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

788

977

connection)

795

984

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

796

985

return e

797

986

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

987

# Add property tags

798

988

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

799

989

for name, prop

800

in self._get_all_dbus_properties()

990

in self._get_all_dbus_things("property")

801

991

if prop._dbus_interface

802

992

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

803

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)

804

1025

# Add the names to the return values for the

805

1026

# "org.freedesktop.DBus.Properties" methods

806

1027

if (if_tag.getAttribute("name")

821

1042

except (AttributeError, xml.dom.DOMException,

822

1043

xml.parsers.expat.ExpatError) as error:

823

1044

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

824

error)

1045

exc_info=error)

825

1046

return xmlstring

826

1047

827

1048

828

def datetime_to_dbus (dt, variant_level=0):

1049

def datetime_to_dbus(dt, variant_level=0):

829

1050

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

830

1051

if dt is None:

831

1052

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

832

1053

return dbus.String(dt.isoformat(),

833

1054

variant_level=variant_level)

834

1055

835

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

836

.__metaclass__):

837

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

838

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).

839

1079

"""

840

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

841

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

842

# methods, signals, or properties in them

843

for base in (b for b in bases

844

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

845

# Go though all attributes of the base class

846

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):

847

1087

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

848

1088

# with the wrong interface name

849

1089

if (not hasattr(attribute, "_dbus_interface")

850

1090

or not attribute._dbus_interface

851

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

1091

.startswith(orig_interface_name)):

852

1092

continue

853

1093

# Create an alternate D-Bus interface name based on

854

1094

# the current name

855

1095

alt_interface = (attribute._dbus_interface

856

.replace("se.recompile.Mandos",

857

"se.bsnet.fukt.Mandos"))

1096

.replace(orig_interface_name,

1097

alt_interface_name))

1098

interface_names.add(alt_interface)

858

1099

# Is this a D-Bus signal?

859

1100

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

860

# Extract the original non-method function by

861

# black magic

1101

# Extract the original non-method undecorated

1102

# function by black magic

862

1103

nonmethod_func = (dict(

863

1104

zip(attribute.func_code.co_freevars,

864

1105

attribute.__closure__))["func"]

875

1116

nonmethod_func.func_name,

876

1117

nonmethod_func.func_defaults,

877

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

878

1125

# Define a creator of a function to call both the

879

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

880

# 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

881

1129

def fixscope(func1, func2):

882

1130

"""This function is a scope container to pass

883

1131

func1 and func2 to the "call_both" function

890

1138

return call_both

891

1139

# Create the "call_both" function and add it to

892

1140

# the class

893

attr[attrname] = fixscope(attribute,

894

new_function)

1141

attr[attrname] = fixscope(attribute, new_function)

895

1142

# Is this a D-Bus method?

896

1143

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

897

1144

# Create a new, but exactly alike, function

908

1155

attribute.func_name,

909

1156

attribute.func_defaults,

910

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

911

1164

# Is this a D-Bus property?

912

1165

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

913

1166

# Create a new, but exactly alike, function

927

1180

attribute.func_name,

928

1181

attribute.func_defaults,

929

1182

attribute.func_closure)))

930

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

931

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"})

932

1228

class ClientDBus(Client, DBusObjectWithProperties):

933

1229

"""A Client class using D-Bus

934

1230

945

1241

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

946

1242

self.bus = bus

947

1243

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

948

949

self._approvals_pending = 0

950

1244

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

951

1245

# the D-Bus

952

1246

client_object_name = unicode(self.name).translate(

956

1250

("/clients/" + client_object_name))

957

1251

DBusObjectWithProperties.__init__(self, self.bus,

958

1252

self.dbus_object_path)

959

1253

960

1254

def notifychangeproperty(transform_func,

961

1255

dbus_name, type_func=lambda x: x,

962

1256

variant_level=1):

963

1257

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

964

1258

its changes to DBus.

965

1259

966

1260

transform_fun: Function that takes a value and a variant_level

967

1261

and transforms it to a D-Bus type.

968

1262

dbus_name: D-Bus name of the variable

985

1279

986

1280

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

987

1281

988

989

1282

expires = notifychangeproperty(datetime_to_dbus, "Expires")

990

1283

approvals_pending = notifychangeproperty(dbus.Boolean,

991

1284

"ApprovalPending",

998

1291

checker is not None)

999

1292

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1000

1293

"LastCheckedOK")

1294

last_checker_status = notifychangeproperty(dbus.Int16,

1295

"LastCheckerStatus")

1001

1296

last_approval_request = notifychangeproperty(

1002

1297

datetime_to_dbus, "LastApprovalRequest")

1003

1298

approved_by_default = notifychangeproperty(dbus.Boolean,

1004

1299

"ApprovedByDefault")

1005

approval_delay = notifychangeproperty(dbus.UInt16,

1300

approval_delay = notifychangeproperty(dbus.UInt64,

1006

1301

"ApprovalDelay",

1007

1302

type_func =

1008

_timedelta_to_milliseconds)

1303

timedelta_to_milliseconds)

1009

1304

approval_duration = notifychangeproperty(

1010

dbus.UInt16, "ApprovalDuration",

1011

type_func = _timedelta_to_milliseconds)

1305

dbus.UInt64, "ApprovalDuration",

1306

type_func = timedelta_to_milliseconds)

1012

1307

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

1013

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

1308

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

1014

1309

type_func =

1015

_timedelta_to_milliseconds)

1310

timedelta_to_milliseconds)

1016

1311

extended_timeout = notifychangeproperty(

1017

dbus.UInt16, "ExtendedTimeout",

1018

type_func = _timedelta_to_milliseconds)

1019

interval = notifychangeproperty(dbus.UInt16,

1312

dbus.UInt64, "ExtendedTimeout",

1313

type_func = timedelta_to_milliseconds)

1314

interval = notifychangeproperty(dbus.UInt64,

1020

1315

"Interval",

1021

1316

type_func =

1022

_timedelta_to_milliseconds)

1317

timedelta_to_milliseconds)

1023

1318

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

1024

1319

1025

1320

del notifychangeproperty

1067

1362

return r

1068

1363

1069

1364

def _reset_approved(self):

1070

self._approved = None

1365

self.approved = None

1071

1366

return False

1072

1367

1073

1368

def approve(self, value=True):

1074

self.send_changedstate()

1075

self._approved = value

1076

gobject.timeout_add(_timedelta_to_milliseconds

1369

self.approved = value

1370

gobject.timeout_add(timedelta_to_milliseconds

1077

1371

(self.approval_duration),

1078

1372

self._reset_approved)

1079

1373

self.send_changedstate()

1080

1374

1081

1375

## D-Bus methods, signals & properties

1082

1376

_interface = "se.recompile.Mandos.Client"

1083

1377

1378

## Interfaces

1379

1380

@dbus_interface_annotations(_interface)

1381

def _foo(self):

1382

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

1383

"false"}

1384

1084

1385

## Signals

1085

1386

1086

1387

# CheckerCompleted - signal

1122

1423

"D-Bus signal"

1123

1424

return self.need_approval()

1124

1425

1125

# NeRwequest - signal

1126

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

1127

def NewRequest(self, ip):

1128

"""D-Bus signal

1129

Is sent after a client request a password.

1130

"""

1131

pass

1132

1133

1426

## Methods

1134

1427

1135

1428

# Approve - method

1193

1486

access="readwrite")

1194

1487

def ApprovalDuration_dbus_property(self, value=None):

1195

1488

if value is None: # get

1196

return dbus.UInt64(_timedelta_to_milliseconds(

1489

return dbus.UInt64(timedelta_to_milliseconds(

1197

1490

self.approval_duration))

1198

1491

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

1199

1492

1213

1506

def Host_dbus_property(self, value=None):

1214

1507

if value is None: # get

1215

1508

return dbus.String(self.host)

1216

self.host = value

1509

self.host = unicode(value)

1217

1510

1218

1511

# Created - property

1219

1512

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

1220

1513

def Created_dbus_property(self):

1221

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

1514

return datetime_to_dbus(self.created)

1222

1515

1223

1516

# LastEnabled - property

1224

1517

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

1245

1538

return

1246

1539

return datetime_to_dbus(self.last_checked_ok)

1247

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

1248

1547

# Expires - property

1249

1548

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

1250

1549

def Expires_dbus_property(self):

1261

1560

def Timeout_dbus_property(self, value=None):

1262

1561

if value is None: # get

1263

1562

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1264

1564

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

1265

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

1266

return

1267

# Reschedule timeout

1268

gobject.source_remove(self.disable_initiator_tag)

1269

self.disable_initiator_tag = None

1270

self.expires = None

1271

time_to_die = _timedelta_to_milliseconds((self

1272

.last_checked_ok

1273

+ self.timeout)

1274

- datetime.datetime

1275

.utcnow())

1276

if time_to_die <= 0:

1277

# The timeout has passed

1278

self.disable()

1279

else:

1280

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

1281

+ datetime.timedelta(milliseconds =

1282

time_to_die))

1283

self.disable_initiator_tag = (gobject.timeout_add

1284

(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))

1285

1581

1286

1582

# ExtendedTimeout - property

1287

1583

@dbus_service_property(_interface, signature="t",

1300

1596

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

1301

1597

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

1302

1598

return

1303

# Reschedule checker run

1304

gobject.source_remove(self.checker_initiator_tag)

1305

self.checker_initiator_tag = (gobject.timeout_add

1306

(value, self.start_checker))

1307

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

1308

1605

1309

1606

# Checker - property

1310

1607

@dbus_service_property(_interface, signature="s",

1312

1609

def Checker_dbus_property(self, value=None):

1313

1610

if value is None: # get

1314

1611

return dbus.String(self.checker_command)

1315

self.checker_command = value

1612

self.checker_command = unicode(value)

1316

1613

1317

1614

# CheckerRunning - property

1318

1615

@dbus_service_property(_interface, signature="b",

1347

1644

raise KeyError()

1348

1645

1349

1646

def __getattribute__(self, name):

1350

if(name == '_pipe'):

1647

if name == '_pipe':

1351

1648

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

1352

1649

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

1353

1650

data = self._pipe.recv()

1360

1657

return func

1361

1658

1362

1659

def __setattr__(self, name, value):

1363

if(name == '_pipe'):

1660

if name == '_pipe':

1364

1661

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

1365

1662

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

1366

1663

1367

class ClientDBusTransitional(ClientDBus):

1368

__metaclass__ = AlternateDBusNamesMetaclass

1369

1664

1370

1665

class ClientHandler(socketserver.BaseRequestHandler, object):

1371

1666

"""A class to handle client connections.

1408

1703

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

1409

1704

try:

1410

1705

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

1411

raise RuntimeError

1706

raise RuntimeError(line)

1412

1707

except (ValueError, IndexError, RuntimeError) as error:

1413

1708

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

1414

1709

return

1433

1728

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

1434

1729

return

1435

1730

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

1436

if self.server.use_dbus:

1437

# Emit D-Bus signal

1438

client.NewRequest(str(self.client_address))

1439

1731

1440

1732

try:

1441

1733

client = ProxyClient(child_pipe, fpr,

1457

1749

client.Rejected("Disabled")

1458

1750

return

1459

1751

1460

if client._approved or not client.approval_delay:

1752

if client.approved or not client.approval_delay:

1461

1753

#We are approved or approval is disabled

1462

1754

break

1463

elif client._approved is None:

1755

elif client.approved is None:

1464

1756

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

1465

1757

client.name)

1466

1758

if self.server.use_dbus:

1479

1771

#wait until timeout or approved

1480

1772

time = datetime.datetime.now()

1481

1773

client.changedstate.acquire()

1482

(client.changedstate.wait

1483

(float(client._timedelta_to_milliseconds(delay)

1484

/ 1000)))

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1485

1777

client.changedstate.release()

1486

1778

time2 = datetime.datetime.now()

1487

1779

if (time2 - time) >= delay:

1503

1795

try:

1504

1796

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

1505

1797

except gnutls.errors.GNUTLSError as error:

1506

logger.warning("gnutls send failed")

1798

logger.warning("gnutls send failed",

1799

exc_info=error)

1507

1800

return

1508

1801

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

1509

1802

sent, len(client.secret)

1512

1805

1513

1806

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

1514

1807

# bump the timeout using extended_timeout

1515

client.checked_ok(client.extended_timeout)

1808

client.bump_timeout(client.extended_timeout)

1516

1809

if self.server.use_dbus:

1517

1810

# Emit D-Bus signal

1518

1811

client.GotSecret()

1523

1816

try:

1524

1817

session.bye()

1525

1818

except gnutls.errors.GNUTLSError as error:

1526

logger.warning("GnuTLS bye failed")

1819

logger.warning("GnuTLS bye failed",

1820

exc_info=error)

1527

1821

1528

1822

@staticmethod

1529

1823

def peer_certificate(session):

1585

1879

# Convert the buffer to a Python bytestring

1586

1880

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

1587

1881

# Convert the bytestring to hexadecimal notation

1588

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

1882

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

1589

1883

return hex_fpr

1590

1884

1591

1885

1594

1888

def sub_process_main(self, request, address):

1595

1889

try:

1596

1890

self.finish_request(request, address)

1597

except:

1891

except Exception:

1598

1892

self.handle_error(request, address)

1599

1893

self.close_request(request)

1600

1894

1601

1895

def process_request(self, request, address):

1602

1896

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

1603

1897

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

1604

args = (request,

1605

address))

1898

args = (request, address))

1606

1899

proc.start()

1607

1900

return proc

1608

1901

1623

1916

1624

1917

def add_pipe(self, parent_pipe, proc):

1625

1918

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

1626

raise NotImplementedError

1919

raise NotImplementedError()

1627

1920

1628

1921

1629

1922

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1636

1929

use_ipv6: Boolean; to use IPv6 or not

1637

1930

"""

1638

1931

def __init__(self, server_address, RequestHandlerClass,

1639

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

"""

1640

1936

self.interface = interface

1641

1937

if use_ipv6:

1642

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.

1643

1965

socketserver.TCPServer.__init__(self, server_address,

1644

1966

RequestHandlerClass)

1967

1645

1968

def server_bind(self):

1646

1969

"""This overrides the normal server_bind() function

1647

1970

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

1655

1978

try:

1656

1979

self.socket.setsockopt(socket.SOL_SOCKET,

1657

1980

SO_BINDTODEVICE,

1658

str(self.interface

1659

+ '\0'))

1981

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

1660

1982

except socket.error as error:

1661

if error[0] == errno.EPERM:

1662

logger.error("No permission to"

1663

" bind to interface %s",

1664

self.interface)

1665

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:

1666

1987

logger.error("SO_BINDTODEVICE not available;"

1667

1988

" cannot bind to interface %s",

1668

1989

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

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

1992

" cannot bind", self.interface)

1669

1993

else:

1670

1994

raise

1671

1995

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

1674

1998

if self.address_family == socket.AF_INET6:

1675

1999

any_address = "::" # in6addr_any

1676

2000

else:

1677

any_address = socket.INADDR_ANY

2001

any_address = "0.0.0.0" # INADDR_ANY

1678

2002

self.server_address = (any_address,

1679

2003

self.server_address[1])

1680

2004

elif not self.server_address[1]:

1701

2025

"""

1702

2026

def __init__(self, server_address, RequestHandlerClass,

1703

2027

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

1704

gnutls_priority=None, use_dbus=True):

2028

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

1705

2029

self.enabled = False

1706

2030

self.clients = clients

1707

2031

if self.clients is None:

1711

2035

IPv6_TCPServer.__init__(self, server_address,

1712

2036

RequestHandlerClass,

1713

2037

interface = interface,

1714

use_ipv6 = use_ipv6)

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1715

2040

def server_activate(self):

1716

2041

if self.enabled:

1717

2042

return socketserver.TCPServer.server_activate(self)

1730

2055

1731

2056

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

1732

2057

proc = None, client_object=None):

1733

condition_names = {

1734

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

1735

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

1736

# blocking).

1737

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

1738

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

1739

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

1740

# broken, usually for pipes and

1741

# sockets).

1742

}

1743

conditions_string = ' | '.join(name

1744

for cond, name in

1745

condition_names.iteritems()

1746

if cond & condition)

1747

2058

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

1748

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

2059

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

1749

2060

# Wait for other process to exit

1750

2061

proc.join()

1751

2062

return False

1809

2120

return True

1810

2121

1811

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

1812

2222

def string_to_delta(interval):

1813

2223

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

1814

2224

1825

2235

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

1826

2236

datetime.timedelta(0, 330)

1827

2237

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

1828

2244

timevalue = datetime.timedelta(0)

1829

2245

for s in interval.split():

1830

2246

try:

1841

2257

elif suffix == "w":

1842

2258

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

1843

2259

else:

1844

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

1845

except (ValueError, IndexError) as e:

2260

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

2261

.format(suffix))

2262

except IndexError as e:

1846

2263

raise ValueError(*(e.args))

1847

2264

timevalue += delta

1848

2265

return timevalue

1849

2266

1850

2267

1851

def if_nametoindex(interface):

1852

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

1853

1854

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

1855

global if_nametoindex

1856

try:

1857

if_nametoindex = (ctypes.cdll.LoadLibrary

1858

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

1859

.if_nametoindex)

1860

except (OSError, AttributeError):

1861

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

1862

def if_nametoindex(interface):

1863

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

1864

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

1865

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

1866

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1867

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

1868

interface))

1869

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

1870

ifreq[16:20])[0]

1871

return interface_index

1872

return if_nametoindex(interface)

1873

1874

1875

2268

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

1876

2269

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

1877

2270

1885

2278

sys.exit()

1886

2279

if not noclose:

1887

2280

# Close all standard open file descriptors

1888

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

2281

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

1889

2282

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

1890

2283

raise OSError(errno.ENODEV,

1891

"%s not a character device"

1892

% os.path.devnull)

2284

"{0} not a character device"

2285

.format(os.devnull))

1893

2286

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

1894

2287

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

1895

2288

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

1904

2297

1905

2298

parser = argparse.ArgumentParser()

1906

2299

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

1907

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

2300

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

1908

2301

help="show version number and exit")

1909

2302

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

1910

2303

help="Bind to interface IF")

1916

2309

help="Run self-test")

1917

2310

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

1918

2311

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

1919

" to terminal")

2312

" to terminal", default=None)

1920

2313

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

1921

2314

help="Debug level for stdout output")

1922

2315

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

1929

2322

" files")

1930

2323

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

1931

2324

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

1932

" system bus interface")

2325

" system bus interface", default=None)

1933

2326

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

1934

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

2327

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

2328

default=None)

1935

2329

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

1936

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

1937

default=True)

1938

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

1939

2340

options = parser.parse_args()

1940

2341

1941

2342

if options.check:

1949

2350

"port": "",

1950

2351

"debug": "False",

1951

2352

"priority":

1952

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

2353

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

1953

2354

"servicename": "Mandos",

1954

2355

"use_dbus": "True",

1955

2356

"use_ipv6": "True",

1956

2357

"debuglevel": "",

2358

"restore": "True",

2359

"socket": "",

2360

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

2361

"foreground": "False",

1957

2362

}

1958

2363

1959

2364

# Parse config file for server-global settings

1964

2369

# Convert the SafeConfigParser object to a dict

1965

2370

server_settings = server_config.defaults()

1966

2371

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

1967

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

2372

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

1968

2373

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

1969

2374

option)

1970

2375

if server_settings["port"]:

1971

2376

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

1972

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"])

1973

2387

del server_config

1974

2388

1975

2389

# Override the settings from the config file with command line

1976

2390

# options, if set.

1977

2391

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

1978

2392

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

1979

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

2393

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

2394

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

1980

2395

value = getattr(options, option)

1981

2396

if value is not None:

1982

2397

server_settings[option] = value

1985

2400

for option in server_settings.keys():

1986

2401

if type(server_settings[option]) is str:

1987

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

1988

2410

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

1989

2411

1990

2412

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

1994

2416

debuglevel = server_settings["debuglevel"]

1995

2417

use_dbus = server_settings["use_dbus"]

1996

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"]

2422

2423

if debug:

2424

initlogger(debug, logging.DEBUG)

2425

else:

2426

if not debuglevel:

2427

initlogger(debug)

2428

else:

2429

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

2430

initlogger(debug, level)

1997

2431

1998

2432

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

1999

2433

syslogger.setFormatter(logging.Formatter

2000

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

2001

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

2002

% server_settings["servicename"]))

2434

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

2435

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

2436

.format(server_settings

2437

["servicename"])))

2003

2438

2004

2439

# Parse config file with clients

2005

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

2006

"extended_timeout": "15m",

2007

"interval": "2m",

2008

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

2009

"host": "",

2010

"approval_delay": "0s",

2011

"approval_duration": "1s",

2012

}

2013

client_config = configparser.SafeConfigParser(client_defaults)

2440

client_config = configparser.SafeConfigParser(Client

2441

.client_defaults)

2014

2442

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

2015

2443

"clients.conf"))

2016

2444

2025

2453

use_ipv6=use_ipv6,

2026

2454

gnutls_priority=

2027

2455

server_settings["priority"],

2028

use_dbus=use_dbus)

2029

if not debug:

2030

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

2031

2464

try:

2032

2465

pidfile = open(pidfilename, "w")

2033

except IOError:

2034

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)

2035

2469

2036

try:

2037

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

2038

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

2039

except KeyError:

2470

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

2040

2471

try:

2041

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

2042

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

2472

uid = pwd.getpwnam(name).pw_uid

2473

gid = pwd.getpwnam(name).pw_gid

2474

break

2043

2475

except KeyError:

2044

try:

2045

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

2046

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

2047

except KeyError:

2048

uid = 65534

2049

gid = 65534

2476

continue

2477

else:

2478

uid = 65534

2479

gid = 65534

2050

2480

try:

2051

2481

os.setgid(gid)

2052

2482

os.setuid(uid)

2053

2483

except OSError as error:

2054

if error[0] != errno.EPERM:

2055

raise error

2056

2057

if not debug and not debuglevel:

2058

logger.setLevel(logging.WARNING)

2059

if debuglevel:

2060

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

2061

logger.setLevel(level)

2484

if error.errno != errno.EPERM:

2485

raise

2062

2486

2063

2487

if debug:

2064

logger.setLevel(logging.DEBUG)

2065

2488

# Enable all possible GnuTLS debugging

2066

2489

2067

2490

# "Use a log level over 10 to enable all debugging options."

2076

2499

.gnutls_global_set_log_function(debug_gnutls))

2077

2500

2078

2501

# Redirect stdin so all checkers get /dev/null

2079

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

2502

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

2080

2503

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

2081

2504

if null > 2:

2082

2505

os.close(null)

2083

else:

2084

# No console logging

2085

logger.removeHandler(console)

2086

2506

2087

2507

# Need to fork before connecting to D-Bus

2088

if not debug:

2508

if not foreground:

2089

2509

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

2090

2510

daemon()

2091

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

2092

2516

global main_loop

2093

2517

# From the Avahi example code

2094

DBusGMainLoop(set_as_default=True )

2518

DBusGMainLoop(set_as_default=True)

2095

2519

main_loop = gobject.MainLoop()

2096

2520

bus = dbus.SystemBus()

2097

2521

# End of Avahi example code

2103

2527

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

2104

2528

do_not_queue=True))

2105

2529

except dbus.exceptions.NameExistsException as e:

2106

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

2530

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

2107

2531

use_dbus = False

2108

2532

server_settings["use_dbus"] = False

2109

2533

tcp_server.use_dbus = False

2121

2545

2122

2546

client_class = Client

2123

2547

if use_dbus:

2124

client_class = functools.partial(ClientDBusTransitional,

2125

bus = bus)

2126

2127

special_settings = {

2128

# Some settings need to be accessd by special methods;

2129

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

2130

"approved_by_default":

2131

lambda section:

2132

client_config.getboolean(section, "approved_by_default"),

2133

}

2134

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

2135

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

2136

# with exceptions for any special settings as defined above

2137

client_settings = dict((clientname,

2138

dict((setting,

2139

(value if setting not in special_settings

2140

else special_settings[setting](clientname)))

2141

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

2142

for clientname in client_config.sections())

2143

2548

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

2549

2550

client_settings = Client.config_parser(client_config)

2144

2551

old_client_settings = {}

2145

clients_data = []

2146

2147

# 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.

2148

2563

if server_settings["restore"]:

2149

2564

try:

2150

2565

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

2151

clients_data, old_client_settings = pickle.load(stored_state)

2566

clients_data, old_client_settings = (pickle.load

2567

(stored_state))

2152

2568

os.remove(stored_state_path)

2153

2569

except IOError as e:

2154

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

2155

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)

2156

2576

raise

2157

2158

for client in clients_data:

2159

client_name = client["name"]

2160

2161

# Decide which value to use after restoring saved state.

2162

# We have three different values: Old config file,

2163

# new config file, and saved state.

2164

# New config value takes precedence if it differs from old

2165

# config value, otherwise use saved state.

2166

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))

2167

2631

try:

2168

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

2169

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

2170

# attribute)

2171

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

2172

setattr(client, name, value)

2173

except KeyError:

2174

pass

2175

2176

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

2177

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

2178

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

2179

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

2180

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

2181

> client["interval"]):

2182

if client["last_checker_status"] != 0:

2183

client["enabled"] = False

2184

else:

2185

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

2186

2187

client["changedstate"] = (multiprocessing_manager

2188

.Condition(multiprocessing_manager

2189

.Lock()))

2190

if use_dbus:

2191

new_client = ClientDBusTransitional.__new__(ClientDBusTransitional)

2192

tcp_server.clients[client_name] = new_client

2193

new_client.bus = bus

2194

for name, value in client.iteritems():

2195

setattr(new_client, name, value)

2196

client_object_name = unicode(client_name).translate(

2197

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

2198

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

2199

new_client.dbus_object_path = (dbus.ObjectPath

2200

("/clients/" + client_object_name))

2201

DBusObjectWithProperties.__init__(new_client,

2202

new_client.bus,

2203

new_client.dbus_object_path)

2204

else:

2205

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

2206

for name, value in client.iteritems():

2207

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

2208

2209

tcp_server.clients[client_name].decrypt_secret(

2210

client_settings[client_name]["secret"])

2211

2212

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

2213

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

2214

del tcp_server.clients[clientname]

2215

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

2216

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

2217

config =

2218

client_settings

2219

[clientname]))

2220

2221

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

2222

2657

if not tcp_server.clients:

2223

2658

logger.warning("No clients defined")

2224

2225

if not debug:

2226

try:

2227

with pidfile:

2228

pid = os.getpid()

2229

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

2230

del pidfile

2231

except IOError:

2232

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

2233

pidfilename, pid)

2234

except NameError:

2235

# "pidfile" was never created

2236

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

2237

2670

del pidfilename

2238

2239

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

2240

2671

2241

2672

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

2242

2673

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

2243

2674

2244

2675

if use_dbus:

2245

class MandosDBusService(dbus.service.Object):

2676

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

2677

"se.bsnet.fukt.Mandos"})

2678

class MandosDBusService(DBusObjectWithProperties):

2246

2679

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

2247

2680

def __init__(self):

2248

2681

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

2249

2682

_interface = "se.recompile.Mandos"

2250

2683

2684

@dbus_interface_annotations(_interface)

2685

def _foo(self):

2686

return { "org.freedesktop.DBus.Property"

2687

".EmitsChangedSignal":

2688

"false"}

2689

2251

2690

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

2252

2691

def ClientAdded(self, objpath):

2253

2692

"D-Bus signal"

2295

2734

2296

2735

del _interface

2297

2736

2298

class MandosDBusServiceTransitional(MandosDBusService):

2299

__metaclass__ = AlternateDBusNamesMetaclass

2300

mandos_dbus_service = MandosDBusServiceTransitional()

2737

mandos_dbus_service = MandosDBusService()

2301

2738

2302

2739

def cleanup():

2303

2740

"Cleanup function; run on exit"

2304

2741

service.cleanup()

2305

2742

2306

2743

multiprocessing.active_children()

2744

wnull.close()

2307

2745

if not (tcp_server.clients or client_settings):

2308

2746

return

2309

2310

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

2311

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

2312

# secret will thus be unrecovable.

2313

clients = []

2314

for client in tcp_server.clients.itervalues():

2315

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

2316

2317

client_dict = {}

2318

2319

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

2320

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

2321

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

2322

exclude.add(name)

2323

2324

client_dict["encrypted_secret"] = client.encrypted_secret

2325

for attr in client.client_structure:

2326

if attr not in exclude:

2327

client_dict[attr] = getattr(client, attr)

2328

2329

clients.append(client_dict)

2330

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

2331

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

2332

2776

try:

2333

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:

2334

2781

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

2335

except IOError as e:

2336

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

2337

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)

2338

2796

raise

2339

2797

2340

2798

# Delete all clients, and settings from config

2341

2799

while tcp_server.clients:

2342

2800

name, client = tcp_server.clients.popitem()

2360

2818

# Need to initiate checking of clients

2361

2819

if client.enabled:

2362

2820

client.init_checker()

2363

2364

2821

2365

2822

tcp_server.enable()

2366

2823

tcp_server.server_activate()

2369

2826

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

2370

2827

if use_ipv6:

2371

2828

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

2372

" flowinfo %d, scope_id %d"

2373

% tcp_server.socket.getsockname())

2829

" flowinfo %d, scope_id %d",

2830

*tcp_server.socket.getsockname())

2374

2831

else: # IPv4

2375

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

2376

% tcp_server.socket.getsockname())

2832

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

2833

*tcp_server.socket.getsockname())

2377

2834

2378

2835

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

2379

2836

2382

2839

try:

2383

2840

service.activate()

2384

2841

except dbus.exceptions.DBusException as error:

2385

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

2842

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

2386

2843

cleanup()

2387

2844

sys.exit(1)

2388

2845

# End of Avahi example code

2395

2852

logger.debug("Starting main loop")

2396

2853

main_loop.run()

2397

2854

except AvahiError as error:

2398

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

2855

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

2399

2856

cleanup()

2400

2857

sys.exit(1)

2401

2858

except KeyboardInterrupt:

2406

2863

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

2407

2864

cleanup()

2408

2865

2409

2410

2866

if __name__ == '__main__':

2411

2867

main()