/mandos/trunk : revision 518.1.7

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#!/usr/bin/python2.7

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#!/usr/bin/python

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# -*- mode: python; coding: utf-8 -*-

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#

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# Mandos server - give out binary blobs to connecting clients.

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import hashlib

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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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if sys.version_info.major == 2:

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str = unicode

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version = "1.6.9"

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stored_state_file = "clients.pickle"

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version = "1.4.1"

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

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logger = logging.getLogger()

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syslogger = None

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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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(b"16s16x", interface))

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interface_index = struct.unpack("I", ifreq[16:20])[0]

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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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def initlogger(level=logging.WARNING):

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler

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(facility =

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logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/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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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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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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class AvahiError(Exception):

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

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self.value = value

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return super(AvahiError, self).__init__(value, *args,

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**kwargs)

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super(AvahiError, self).__init__(value, *args, **kwargs)

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self, remove=True):

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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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logger.critical("No suitable Zeroconf service name found"

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = str(self.server

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.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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

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self.name)

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if remove:

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self.remove()

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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if (error.get_dbus_name()

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== "org.freedesktop.Avahi.CollisionError"):

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logger.info("Local Zeroconf service name collision.")

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return self.rename(remove=False)

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else:

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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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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self.rename()

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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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str(error))

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

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.format(error))

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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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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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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, *args, **kwargs):

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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, *args, **kwargs)

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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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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return ret

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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checker, or None.

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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@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.

475

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

476

value given the same arguments.

477

"""

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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(" ", ""))

492

if "secret" in section:

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

494

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 {}"

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.format(section))

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

503

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"])

510

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

511

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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515

return settings

516

517

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

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

357

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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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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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):

371

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

372

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

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attribute."""

518

374

self.name = name

519

if server_settings is None:

520

server_settings = {}

521

self.server_settings = server_settings

522

# adding all client settings

523

for setting, value in settings.items():

524

setattr(self, setting, value)

525

526

if self.enabled:

527

if not hasattr(self, "last_enabled"):

528

self.last_enabled = datetime.datetime.utcnow()

529

if not hasattr(self, "expires"):

530

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

531

+ self.timeout)

532

else:

533

self.last_enabled = None

534

self.expires = None

535

375

if config is None:

376

config = {}

536

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

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# Uppercase and remove spaces from fingerprint for later

538

379

# comparison purposes with return value from the fingerprint()

539

380

# function

381

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

382

.replace(" ", ""))

540

383

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

541

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

542

datetime.datetime.utcnow())

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# attributes specific for this server instance

384

if "secret" in config:

385

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

386

elif "secfile" in config:

387

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

388

(config["secfile"])),

389

"rb") as secfile:

390

self.secret = secfile.read()

391

else:

392

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

393

% self.name)

394

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

395

self.created = datetime.datetime.utcnow()

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self.enabled = True

397

self.last_approval_request = None

398

self.last_enabled = datetime.datetime.utcnow()

399

self.last_checked_ok = None

400

self.last_checker_status = None

401

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

402

self.extended_timeout = string_to_delta(config

403

["extended_timeout"])

404

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

545

405

self.checker = None

546

406

self.checker_initiator_tag = None

547

407

self.disable_initiator_tag = None

408

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

548

409

self.checker_callback_tag = None

410

self.checker_command = config["checker"]

549

411

self.current_checker_command = None

550

self.approved = None

412

self._approved = None

413

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

414

True)

551

415

self.approvals_pending = 0

416

self.approval_delay = string_to_delta(

417

config["approval_delay"])

418

self.approval_duration = string_to_delta(

419

config["approval_duration"])

552

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self.changedstate = (multiprocessing_manager

553

421

.Condition(multiprocessing_manager

554

422

.Lock()))

574

442

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

575

443

# Already enabled

576

444

return

445

self.send_changedstate()

577

446

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

578

447

self.enabled = True

579

448

self.last_enabled = datetime.datetime.utcnow()

580

449

self.init_checker()

581

self.send_changedstate()

582

450

583

451

def disable(self, quiet=True):

584

452

"""Disable this client."""

585

453

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

586

454

return False

587

455

if not quiet:

456

self.send_changedstate()

457

if not quiet:

588

458

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

589

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

459

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

590

460

gobject.source_remove(self.disable_initiator_tag)

591

461

self.disable_initiator_tag = None

592

462

self.expires = None

593

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

463

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

594

464

gobject.source_remove(self.checker_initiator_tag)

595

465

self.checker_initiator_tag = None

596

466

self.stop_checker()

597

467

self.enabled = False

598

if not quiet:

599

self.send_changedstate()

600

468

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

601

469

return False

602

470

606

474

def init_checker(self):

607

475

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

608

476

# and every interval from then on.

609

if self.checker_initiator_tag is not None:

610

gobject.source_remove(self.checker_initiator_tag)

611

477

self.checker_initiator_tag = (gobject.timeout_add

612

(int(self.interval

613

.total_seconds() * 1000),

478

(self.interval_milliseconds(),

614

479

self.start_checker))

615

480

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

616

if self.disable_initiator_tag is not None:

617

gobject.source_remove(self.disable_initiator_tag)

618

481

self.disable_initiator_tag = (gobject.timeout_add

619

(int(self.timeout

620

.total_seconds() * 1000),

621

self.disable))

482

(self.timeout_milliseconds(),

483

self.disable))

622

484

# Also start a new checker *right now*.

623

485

self.start_checker()

624

486

627

489

self.checker_callback_tag = None

628

490

self.checker = None

629

491

if os.WIFEXITED(condition):

630

self.last_checker_status = os.WEXITSTATUS(condition)

492

self.last_checker_status = os.WEXITSTATUS(condition)

631

493

if self.last_checker_status == 0:

632

494

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

633

495

vars(self))

640

502

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

641

503

vars(self))

642

504

643

def checked_ok(self):

644

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

645

self.last_checked_ok = datetime.datetime.utcnow()

646

self.last_checker_status = 0

647

self.bump_timeout()

648

649

def bump_timeout(self, timeout=None):

650

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

505

def checked_ok(self, timeout=None):

506

"""Bump up the timeout for this client.

507

508

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

509

alive and well.

510

"""

651

511

if timeout is None:

652

512

timeout = self.timeout

513

self.last_checked_ok = datetime.datetime.utcnow()

653

514

if self.disable_initiator_tag is not None:

654

515

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

656

516

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

657

517

self.disable_initiator_tag = (gobject.timeout_add

658

(int(timeout.total_seconds()

659

* 1000), self.disable))

518

(_timedelta_to_milliseconds

519

(timeout), self.disable))

660

520

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

661

521

662

522

def need_approval(self):

668

528

If a checker already exists, leave it running and do

669

529

nothing."""

670

530

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

671

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

672

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

673

# would inevitably timeout, since no checker would get a

674

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

531

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

532

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

533

# client would inevitably timeout, since no checker would get

534

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

675

535

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

676

536

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

677

537

# should be.

679

539

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

680

540

try:

681

541

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

682

except AttributeError:

683

pass

684

except OSError as error:

685

if error.errno != errno.ECHILD:

686

raise

542

except (AttributeError, OSError) as error:

543

if (isinstance(error, OSError)

544

and error.errno != errno.ECHILD):

545

raise error

687

546

else:

688

547

if pid:

689

548

logger.warning("Checker was a zombie")

692

551

self.current_checker_command)

693

552

# Start a new checker if needed

694

553

if self.checker is None:

695

# Escape attributes for the shell

696

escaped_attrs = { attr:

697

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

698

for attr in self.runtime_expansions }

699

554

try:

700

command = self.checker_command % escaped_attrs

701

except TypeError as error:

702

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

703

self.checker_command, exc_info=error)

704

return True # Try again later

555

# In case checker_command has exactly one % operator

556

command = self.checker_command % self.host

557

except TypeError:

558

# Escape attributes for the shell

559

escaped_attrs = dict(

560

(attr,

561

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

562

errors=

563

'replace')))

564

for attr in

565

self.runtime_expansions)

566

567

try:

568

command = self.checker_command % escaped_attrs

569

except TypeError as error:

570

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

571

' %s', self.checker_command, error)

572

return True # Try again later

705

573

self.current_checker_command = command

706

574

try:

707

575

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

710

578

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

711

579

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

712

580

# always replaced by /dev/null.)

713

# The exception is when not debugging but nevertheless

714

# running in the foreground; use the previously

715

# created wnull.

716

popen_args = {}

717

if (not self.server_settings["debug"]

718

and self.server_settings["foreground"]):

719

popen_args.update({"stdout": wnull,

720

"stderr": wnull })

721

581

self.checker = subprocess.Popen(command,

722

582

close_fds=True,

723

shell=True, cwd="/",

724

**popen_args)

725

except OSError as error:

726

logger.error("Failed to start subprocess",

727

exc_info=error)

728

return True

729

self.checker_callback_tag = (gobject.child_watch_add

730

(self.checker.pid,

731

self.checker_callback,

732

data=command))

733

# The checker may have completed before the gobject

734

# watch was added. Check for this.

735

try:

583

shell=True, cwd="/")

584

self.checker_callback_tag = (gobject.child_watch_add

585

(self.checker.pid,

586

self.checker_callback,

587

data=command))

588

# The checker may have completed before the gobject

589

# watch was added. Check for this.

736

590

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

591

if pid:

592

gobject.source_remove(self.checker_callback_tag)

593

self.checker_callback(pid, status, command)

737

594

except OSError as error:

738

if error.errno == errno.ECHILD:

739

# This should never happen

740

logger.error("Child process vanished",

741

exc_info=error)

742

return True

743

raise

744

if pid:

745

gobject.source_remove(self.checker_callback_tag)

746

self.checker_callback(pid, status, command)

595

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

596

error)

747

597

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

748

598

return True

749

599

756

606

return

757

607

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

758

608

try:

759

self.checker.terminate()

609

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

760

610

#time.sleep(0.5)

761

611

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

762

# self.checker.kill()

612

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

763

613

except OSError as error:

764

614

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

765

615

raise

766

616

self.checker = None

617

618

# Encrypts a client secret and stores it in a varible

619

# encrypted_secret

620

def encrypt_secret(self, key):

621

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

622

# inputed key

623

hasheng = hashlib.sha256()

624

hasheng.update(key)

625

encryptionkey = hasheng.digest()

626

627

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

628

# sucessful

629

hasheng = hashlib.sha256()

630

hasheng.update(self.secret)

631

validationhash = hasheng.digest()

632

633

# Encrypt secret

634

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

635

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

636

Crypto.Cipher.AES.MODE_CFB,

637

iv)

638

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

639

self.encrypted_secret = (ciphertext, iv)

640

641

# Decrypt a encrypted client secret

642

def decrypt_secret(self, key):

643

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

644

hasheng = hashlib.sha256()

645

hasheng.update(key)

646

encryptionkey = hasheng.digest()

647

648

# Decrypt encrypted secret

649

ciphertext, iv = self.encrypted_secret

650

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

651

Crypto.Cipher.AES.MODE_CFB,

652

iv)

653

plain = ciphereng.decrypt(ciphertext)

654

655

# Validate decrypted secret to know if it was succesful

656

hasheng = hashlib.sha256()

657

validationhash = plain[:hasheng.digest_size]

658

secret = plain[hasheng.digest_size:]

659

hasheng.update(secret)

660

661

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

662

# we use the decrypted secret

663

if hasheng.digest() == validationhash:

664

self.secret = secret

665

else:

666

self.secret = key

667

del self.encrypted_secret

767

668

768

669

769

670

def dbus_service_property(dbus_interface, signature="v",

782

683

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

783

684

if byte_arrays and signature != "ay":

784

685

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

785

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

686

" signature %r" % signature)

786

687

def decorator(func):

787

688

func._dbus_is_property = True

788

689

func._dbus_interface = dbus_interface

796

697

return decorator

797

698

798

699

799

def dbus_interface_annotations(dbus_interface):

800

"""Decorator for marking functions returning interface annotations

801

802

Usage:

803

804

@dbus_interface_annotations("org.example.Interface")

805

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

806

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

807

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

808

"false"}

809

"""

810

def decorator(func):

811

func._dbus_is_interface = True

812

func._dbus_interface = dbus_interface

813

func._dbus_name = dbus_interface

814

return func

815

return decorator

816

817

818

def dbus_annotations(annotations):

819

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

820

Usage:

821

822

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

823

"org.freedesktop.DBus.Property."

824

"EmitsChangedSignal": "false"})

825

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

826

access="r")

827

def Property_dbus_property(self):

828

return dbus.Boolean(False)

829

"""

830

def decorator(func):

831

func._dbus_annotations = annotations

832

return func

833

return decorator

834

835

836

700

class DBusPropertyException(dbus.exceptions.DBusException):

837

701

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

838

702

"""

839

pass

703

def __unicode__(self):

704

return unicode(str(self))

705

840

706

841

707

class DBusPropertyAccessException(DBusPropertyException):

842

708

"""A property's access permissions disallows an operation.

859

725

"""

860

726

861

727

@staticmethod

862

def _is_dbus_thing(thing):

863

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

864

865

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

866

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

867

"""

868

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

869

False)

728

def _is_dbus_property(obj):

729

return getattr(obj, "_dbus_is_property", False)

870

730

871

def _get_all_dbus_things(self, thing):

731

def _get_all_dbus_properties(self):

872

732

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

873

733

"""

874

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

875

name),

876

athing.__get__(self))

734

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

877

735

for cls in self.__class__.__mro__

878

for name, athing in

879

inspect.getmembers(cls,

880

self._is_dbus_thing(thing)))

736

for name, prop in

737

inspect.getmembers(cls, self._is_dbus_property))

881

738

882

739

def _get_dbus_property(self, interface_name, property_name):

883

740

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

885

742

"""

886

743

for cls in self.__class__.__mro__:

887

744

for name, value in (inspect.getmembers

888

(cls,

889

self._is_dbus_thing("property"))):

745

(cls, self._is_dbus_property)):

890

746

if (value._dbus_name == property_name

891

747

and value._dbus_interface == interface_name):

892

748

return value.__get__(self)

920

776

# The byte_arrays option is not supported yet on

921

777

# signatures other than "ay".

922

778

if prop._dbus_signature != "ay":

923

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

924

"'ay' signature {!r}"

925

.format(prop._dbus_signature))

926

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

927

for byte in value))

779

raise ValueError

780

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

781

for byte in value))

928

782

prop(value)

929

783

930

784

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

936

790

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

937

791

"""

938

792

properties = {}

939

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

793

for name, prop in self._get_all_dbus_properties():

940

794

if (interface_name

941

795

and interface_name != prop._dbus_interface):

942

796

# Interface non-empty but did not match

952

806

value.variant_level+1)

953

807

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

954

808

955

@dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")

956

def PropertiesChanged(self, interface_name, changed_properties,

957

invalidated_properties):

958

"""Standard D-Bus PropertiesChanged() signal, see D-Bus

959

standard.

960

"""

961

pass

962

963

809

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

964

810

out_signature="s",

965

811

path_keyword='object_path',

966

812

connection_keyword='connection')

967

813

def Introspect(self, object_path, connection):

968

"""Overloading of standard D-Bus method.

969

970

Inserts property tags and interface annotation tags.

814

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

971

815

"""

972

816

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

973

817

connection)

980

824

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

981

825

return e

982

826

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

983

# Add property tags

984

827

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

985

828

for name, prop

986

in self._get_all_dbus_things("property")

829

in self._get_all_dbus_properties()

987

830

if prop._dbus_interface

988

831

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

989

832

if_tag.appendChild(tag)

990

# Add annotation tags

991

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

992

for tag in if_tag.getElementsByTagName(typ):

993

annots = dict()

994

for name, prop in (self.

995

_get_all_dbus_things(typ)):

996

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

997

and prop._dbus_interface

998

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

999

annots.update(getattr

1000

(prop,

1001

"_dbus_annotations",

1002

{}))

1003

for name, value in annots.items():

1004

ann_tag = document.createElement(

1005

"annotation")

1006

ann_tag.setAttribute("name", name)

1007

ann_tag.setAttribute("value", value)

1008

tag.appendChild(ann_tag)

1009

# Add interface annotation tags

1010

for annotation, value in dict(

1011

itertools.chain.from_iterable(

1012

annotations().items()

1013

for name, annotations in

1014

self._get_all_dbus_things("interface")

1015

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

1016

)).items():

1017

ann_tag = document.createElement("annotation")

1018

ann_tag.setAttribute("name", annotation)

1019

ann_tag.setAttribute("value", value)

1020

if_tag.appendChild(ann_tag)

1021

833

# Add the names to the return values for the

1022

834

# "org.freedesktop.DBus.Properties" methods

1023

835

if (if_tag.getAttribute("name")

1038

850

except (AttributeError, xml.dom.DOMException,

1039

851

xml.parsers.expat.ExpatError) as error:

1040

852

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

1041

exc_info=error)

853

error)

1042

854

return xmlstring

1043

855

1044

856

1045

def datetime_to_dbus(dt, variant_level=0):

857

def datetime_to_dbus (dt, variant_level=0):

1046

858

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

1047

859

if dt is None:

1048

860

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

1050

862

variant_level=variant_level)

1051

863

1052

864

1053

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1054

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

1055

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

1056

interface names according to the "alt_interface_names" mapping.

1057

Usage:

1058

1059

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

1060

"net.example.AlternateInterface"})

1061

class SampleDBusObject(dbus.service.Object):

1062

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

1063

def SampleDBusMethod():

1064

pass

1065

1066

The above "SampleDBusMethod" on "SampleDBusObject" will be

1067

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

1068

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

1069

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

1070

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

1071

1072

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

1073

(from DBusObjectWithProperties) and interfaces (from the

1074

dbus_interface_annotations decorator).

865

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

866

.__metaclass__):

867

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

868

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

1075

869

"""

1076

def wrapper(cls):

1077

for orig_interface_name, alt_interface_name in (

1078

alt_interface_names.items()):

1079

attr = {}

1080

interface_names = set()

1081

# Go though all attributes of the class

1082

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

870

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

871

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

872

# methods, signals, or properties in them

873

for base in (b for b in bases

874

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

875

# Go though all attributes of the base class

876

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

1083

877

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

1084

878

# with the wrong interface name

1085

879

if (not hasattr(attribute, "_dbus_interface")

1086

880

or not attribute._dbus_interface

1087

.startswith(orig_interface_name)):

881

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

1088

882

continue

1089

883

# Create an alternate D-Bus interface name based on

1090

884

# the current name

1091

885

alt_interface = (attribute._dbus_interface

1092

.replace(orig_interface_name,

1093

alt_interface_name))

1094

interface_names.add(alt_interface)

886

.replace("se.recompile.Mandos",

887

"se.bsnet.fukt.Mandos"))

1095

888

# Is this a D-Bus signal?

1096

889

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

1097

# Extract the original non-method undecorated

1098

# function by black magic

890

# Extract the original non-method function by

891

# black magic

1099

892

nonmethod_func = (dict(

1100

893

zip(attribute.func_code.co_freevars,

1101

894

attribute.__closure__))["func"]

1112

905

nonmethod_func.func_name,

1113

906

nonmethod_func.func_defaults,

1114

907

nonmethod_func.func_closure)))

1115

# Copy annotations, if any

1116

try:

1117

new_function._dbus_annotations = (

1118

dict(attribute._dbus_annotations))

1119

except AttributeError:

1120

pass

1121

908

# Define a creator of a function to call both the

1122

# original and alternate functions, so both the

1123

# original and alternate signals gets sent when

1124

# the function is called

909

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

910

# signals gets sent when the function is called

1125

911

def fixscope(func1, func2):

1126

912

"""This function is a scope container to pass

1127

913

func1 and func2 to the "call_both" function

1134

920

return call_both

1135

921

# Create the "call_both" function and add it to

1136

922

# the class

1137

attr[attrname] = fixscope(attribute, new_function)

923

attr[attrname] = fixscope(attribute,

924

new_function)

1138

925

# Is this a D-Bus method?

1139

926

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

1140

927

# Create a new, but exactly alike, function

1151

938

attribute.func_name,

1152

939

attribute.func_defaults,

1153

940

attribute.func_closure)))

1154

# Copy annotations, if any

1155

try:

1156

attr[attrname]._dbus_annotations = (

1157

dict(attribute._dbus_annotations))

1158

except AttributeError:

1159

pass

1160

941

# Is this a D-Bus property?

1161

942

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

1162

943

# Create a new, but exactly alike, function

1176

957

attribute.func_name,

1177

958

attribute.func_defaults,

1178

959

attribute.func_closure)))

1179

# Copy annotations, if any

1180

try:

1181

attr[attrname]._dbus_annotations = (

1182

dict(attribute._dbus_annotations))

1183

except AttributeError:

1184

pass

1185

# Is this a D-Bus interface?

1186

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

1187

# Create a new, but exactly alike, function

1188

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

1189

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

1190

# to the class.

1191

attr[attrname] = (dbus_interface_annotations

1192

(alt_interface)

1193

(types.FunctionType

1194

(attribute.func_code,

1195

attribute.func_globals,

1196

attribute.func_name,

1197

attribute.func_defaults,

1198

attribute.func_closure)))

1199

if deprecate:

1200

# Deprecate all alternate interfaces

1201

iname="_AlternateDBusNames_interface_annotation{}"

1202

for interface_name in interface_names:

1203

@dbus_interface_annotations(interface_name)

1204

def func(self):

1205

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

1206

"true" }

1207

# Find an unused name

1208

for aname in (iname.format(i)

1209

for i in itertools.count()):

1210

if aname not in attr:

1211

attr[aname] = func

1212

break

1213

if interface_names:

1214

# Replace the class with a new subclass of it with

1215

# methods, signals, etc. as created above.

1216

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

1217

(cls,), attr)

1218

return cls

1219

return wrapper

1220

1221

1222

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

1223

"se.bsnet.fukt.Mandos"})

960

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

961

962

1224

963

class ClientDBus(Client, DBusObjectWithProperties):

1225

964

"""A Client class using D-Bus

1226

965

1232

971

runtime_expansions = (Client.runtime_expansions

1233

972

+ ("dbus_object_path",))

1234

973

1235

_interface = "se.recompile.Mandos.Client"

1236

1237

974

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

1238

975

1239

976

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

1240

977

self.bus = bus

1241

978

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

979

980

self._approvals_pending = 0

1242

981

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

1243

982

# the D-Bus

1244

client_object_name = str(self.name).translate(

983

client_object_name = unicode(self.name).translate(

1245

984

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

1246

985

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

1247

986

self.dbus_object_path = (dbus.ObjectPath

1248

987

("/clients/" + client_object_name))

1249

988

DBusObjectWithProperties.__init__(self, self.bus,

1250

989

self.dbus_object_path)

1251

990

1252

991

def notifychangeproperty(transform_func,

1253

992

dbus_name, type_func=lambda x: x,

1254

variant_level=1, invalidate_only=False,

1255

_interface=_interface):

993

variant_level=1):

1256

994

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

1257

995

its changes to DBus.

1258

996

1263

1001

to the D-Bus. Default: no transform

1264

1002

variant_level: D-Bus variant level. Default: 1

1265

1003

"""

1266

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

1004

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

1267

1005

def setter(self, value):

1268

1006

if hasattr(self, "dbus_object_path"):

1269

1007

if (not hasattr(self, attrname) or

1270

1008

type_func(getattr(self, attrname, None))

1271

1009

!= type_func(value)):

1272

if invalidate_only:

1273

self.PropertiesChanged(_interface,

1274

dbus.Dictionary(),

1275

dbus.Array

1276

((dbus_name,)))

1277

else:

1278

dbus_value = transform_func(type_func(value),

1279

variant_level

1280

=variant_level)

1281

self.PropertyChanged(dbus.String(dbus_name),

1282

dbus_value)

1283

self.PropertiesChanged(_interface,

1284

dbus.Dictionary({

1285

dbus.String(dbus_name):

1286

dbus_value }), dbus.Array())

1010

dbus_value = transform_func(type_func(value),

1011

variant_level

1012

=variant_level)

1013

self.PropertyChanged(dbus.String(dbus_name),

1014

dbus_value)

1287

1015

setattr(self, attrname, value)

1288

1016

1289

1017

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

1290

1018

1019

1291

1020

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1292

1021

approvals_pending = notifychangeproperty(dbus.Boolean,

1293

1022

"ApprovalPending",

1300

1029

checker is not None)

1301

1030

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1302

1031

"LastCheckedOK")

1303

last_checker_status = notifychangeproperty(dbus.Int16,

1304

"LastCheckerStatus")

1305

1032

last_approval_request = notifychangeproperty(

1306

1033

datetime_to_dbus, "LastApprovalRequest")

1307

1034

approved_by_default = notifychangeproperty(dbus.Boolean,

1308

1035

"ApprovedByDefault")

1309

approval_delay = notifychangeproperty(dbus.UInt64,

1036

approval_delay = notifychangeproperty(dbus.UInt16,

1310

1037

"ApprovalDelay",

1311

1038

type_func =

1312

lambda td: td.total_seconds()

1313

* 1000)

1039

_timedelta_to_milliseconds)

1314

1040

approval_duration = notifychangeproperty(

1315

dbus.UInt64, "ApprovalDuration",

1316

type_func = lambda td: td.total_seconds() * 1000)

1041

dbus.UInt16, "ApprovalDuration",

1042

type_func = _timedelta_to_milliseconds)

1317

1043

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

1318

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

1319

type_func = lambda td:

1320

td.total_seconds() * 1000)

1044

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

1045

type_func =

1046

_timedelta_to_milliseconds)

1321

1047

extended_timeout = notifychangeproperty(

1322

dbus.UInt64, "ExtendedTimeout",

1323

type_func = lambda td: td.total_seconds() * 1000)

1324

interval = notifychangeproperty(dbus.UInt64,

1048

dbus.UInt16, "ExtendedTimeout",

1049

type_func = _timedelta_to_milliseconds)

1050

interval = notifychangeproperty(dbus.UInt16,

1325

1051

"Interval",

1326

1052

type_func =

1327

lambda td: td.total_seconds()

1328

* 1000)

1053

_timedelta_to_milliseconds)

1329

1054

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

1330

secret = notifychangeproperty(dbus.ByteArray, "Secret",

1331

invalidate_only=True)

1332

1055

1333

1056

del notifychangeproperty

1334

1057

1361

1084

*args, **kwargs)

1362

1085

1363

1086

def start_checker(self, *args, **kwargs):

1364

old_checker_pid = getattr(self.checker, "pid", None)

1087

old_checker = self.checker

1088

if self.checker is not None:

1089

old_checker_pid = self.checker.pid

1090

else:

1091

old_checker_pid = None

1365

1092

r = Client.start_checker(self, *args, **kwargs)

1366

1093

# Only if new checker process was started

1367

1094

if (self.checker is not None

1371

1098

return r

1372

1099

1373

1100

def _reset_approved(self):

1374

self.approved = None

1101

self._approved = None

1375

1102

return False

1376

1103

1377

1104

def approve(self, value=True):

1378

self.approved = value

1379

gobject.timeout_add(int(self.approval_duration.total_seconds()

1380

* 1000), self._reset_approved)

1381

1105

self.send_changedstate()

1106

self._approved = value

1107

gobject.timeout_add(_timedelta_to_milliseconds

1108

(self.approval_duration),

1109

self._reset_approved)

1110

1382

1111

1383

1112

## D-Bus methods, signals & properties

1384

1385

## Interfaces

1113

_interface = "se.recompile.Mandos.Client"

1386

1114

1387

1115

## Signals

1388

1116

1399

1127

pass

1400

1128

1401

1129

# PropertyChanged - signal

1402

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

1403

1130

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

1404

1131

def PropertyChanged(self, property, value):

1405

1132

"D-Bus signal"

1426

1153

"D-Bus signal"

1427

1154

return self.need_approval()

1428

1155

1156

# NeRwequest - signal

1157

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

1158

def NewRequest(self, ip):

1159

"""D-Bus signal

1160

Is sent after a client request a password.

1161

"""

1162

pass

1163

1429

1164

## Methods

1430

1165

1431

1166

# Approve - method

1481

1216

access="readwrite")

1482

1217

def ApprovalDelay_dbus_property(self, value=None):

1483

1218

if value is None: # get

1484

return dbus.UInt64(self.approval_delay.total_seconds()

1485

* 1000)

1219

return dbus.UInt64(self.approval_delay_milliseconds())

1486

1220

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

1487

1221

1488

1222

# ApprovalDuration - property

1490

1224

access="readwrite")

1491

1225

def ApprovalDuration_dbus_property(self, value=None):

1492

1226

if value is None: # get

1493

return dbus.UInt64(self.approval_duration.total_seconds()

1494

* 1000)

1227

return dbus.UInt64(_timedelta_to_milliseconds(

1228

self.approval_duration))

1495

1229

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

1496

1230

1497

1231

# Name - property

1510

1244

def Host_dbus_property(self, value=None):

1511

1245

if value is None: # get

1512

1246

return dbus.String(self.host)

1513

self.host = str(value)

1247

self.host = value

1514

1248

1515

1249

# Created - property

1516

1250

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

1517

1251

def Created_dbus_property(self):

1518

return datetime_to_dbus(self.created)

1252

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

1519

1253

1520

1254

# LastEnabled - property

1521

1255

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

1542

1276

return

1543

1277

return datetime_to_dbus(self.last_checked_ok)

1544

1278

1545

# LastCheckerStatus - property

1546

@dbus_service_property(_interface, signature="n",

1547

access="read")

1548

def LastCheckerStatus_dbus_property(self):

1549

return dbus.Int16(self.last_checker_status)

1550

1551

1279

# Expires - property

1552

1280

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

1553

1281

def Expires_dbus_property(self):

1563

1291

access="readwrite")

1564

1292

def Timeout_dbus_property(self, value=None):

1565

1293

if value is None: # get

1566

return dbus.UInt64(self.timeout.total_seconds() * 1000)

1567

old_timeout = self.timeout

1294

return dbus.UInt64(self.timeout_milliseconds())

1568

1295

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

1569

# Reschedule disabling

1570

if self.enabled:

1571

now = datetime.datetime.utcnow()

1572

self.expires += self.timeout - old_timeout

1573

if self.expires <= now:

1574

# The timeout has passed

1575

self.disable()

1576

else:

1577

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

1578

is None):

1579

return

1580

gobject.source_remove(self.disable_initiator_tag)

1581

self.disable_initiator_tag = (

1582

gobject.timeout_add(

1583

int((self.expires - now).total_seconds()

1584

* 1000), self.disable))

1296

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

1297

return

1298

# Reschedule timeout

1299

gobject.source_remove(self.disable_initiator_tag)

1300

self.disable_initiator_tag = None

1301

self.expires = None

1302

time_to_die = _timedelta_to_milliseconds((self

1303

.last_checked_ok

1304

+ self.timeout)

1305

- datetime.datetime

1306

.utcnow())

1307

if time_to_die <= 0:

1308

# The timeout has passed

1309

self.disable()

1310

else:

1311

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

1312

+ datetime.timedelta(milliseconds =

1313

time_to_die))

1314

self.disable_initiator_tag = (gobject.timeout_add

1315

(time_to_die, self.disable))

1585

1316

1586

1317

# ExtendedTimeout - property

1587

1318

@dbus_service_property(_interface, signature="t",

1588

1319

access="readwrite")

1589

1320

def ExtendedTimeout_dbus_property(self, value=None):

1590

1321

if value is None: # get

1591

return dbus.UInt64(self.extended_timeout.total_seconds()

1592

* 1000)

1322

return dbus.UInt64(self.extended_timeout_milliseconds())

1593

1323

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

1594

1324

1595

1325

# Interval - property

1597

1327

access="readwrite")

1598

1328

def Interval_dbus_property(self, value=None):

1599

1329

if value is None: # get

1600

return dbus.UInt64(self.interval.total_seconds() * 1000)

1330

return dbus.UInt64(self.interval_milliseconds())

1601

1331

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

1602

1332

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

1603

1333

return

1604

if self.enabled:

1605

# Reschedule checker run

1606

gobject.source_remove(self.checker_initiator_tag)

1607

self.checker_initiator_tag = (gobject.timeout_add

1608

(value, self.start_checker))

1609

self.start_checker() # Start one now, too

1334

# Reschedule checker run

1335

gobject.source_remove(self.checker_initiator_tag)

1336

self.checker_initiator_tag = (gobject.timeout_add

1337

(value, self.start_checker))

1338

self.start_checker() # Start one now, too

1610

1339

1611

1340

# Checker - property

1612

1341

@dbus_service_property(_interface, signature="s",

1614

1343

def Checker_dbus_property(self, value=None):

1615

1344

if value is None: # get

1616

1345

return dbus.String(self.checker_command)

1617

self.checker_command = str(value)

1346

self.checker_command = value

1618

1347

1619

1348

# CheckerRunning - property

1620

1349

@dbus_service_property(_interface, signature="b",

1636

1365

@dbus_service_property(_interface, signature="ay",

1637

1366

access="write", byte_arrays=True)

1638

1367

def Secret_dbus_property(self, value):

1639

self.secret = bytes(value)

1368

self.secret = str(value)

1640

1369

1641

1370

del _interface

1642

1371

1649

1378

raise KeyError()

1650

1379

1651

1380

def __getattribute__(self, name):

1652

if name == '_pipe':

1381

if(name == '_pipe'):

1653

1382

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

1654

1383

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

1655

1384

data = self._pipe.recv()

1662

1391

return func

1663

1392

1664

1393

def __setattr__(self, name, value):

1665

if name == '_pipe':

1394

if(name == '_pipe'):

1666

1395

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

1667

1396

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

1668

1397

1669

1398

1399

class ClientDBusTransitional(ClientDBus):

1400

__metaclass__ = AlternateDBusNamesMetaclass

1401

1402

1670

1403

class ClientHandler(socketserver.BaseRequestHandler, object):

1671

1404

"""A class to handle client connections.

1672

1405

1676

1409

def handle(self):

1677

1410

with contextlib.closing(self.server.child_pipe) as child_pipe:

1678

1411

logger.info("TCP connection from: %s",

1679

str(self.client_address))

1412

unicode(self.client_address))

1680

1413

logger.debug("Pipe FD: %d",

1681

1414

self.server.child_pipe.fileno())

1682

1415

1708

1441

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

1709

1442

try:

1710

1443

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

1711

raise RuntimeError(line)

1444

raise RuntimeError

1712

1445

except (ValueError, IndexError, RuntimeError) as error:

1713

1446

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

1714

1447

return

1733

1466

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

1734

1467

return

1735

1468

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

1469

if self.server.use_dbus:

1470

# Emit D-Bus signal

1471

client.NewRequest(str(self.client_address))

1736

1472

1737

1473

try:

1738

1474

client = ProxyClient(child_pipe, fpr,

1754

1490

client.Rejected("Disabled")

1755

1491

return

1756

1492

1757

if client.approved or not client.approval_delay:

1493

if client._approved or not client.approval_delay:

1758

1494

#We are approved or approval is disabled

1759

1495

break

1760

elif client.approved is None:

1496

elif client._approved is None:

1761

1497

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

1762

1498

client.name)

1763

1499

if self.server.use_dbus:

1764

1500

# Emit D-Bus signal

1765

1501

client.NeedApproval(

1766

client.approval_delay.total_seconds()

1767

* 1000, client.approved_by_default)

1502

client.approval_delay_milliseconds(),

1503

client.approved_by_default)

1768

1504

else:

1769

1505

logger.warning("Client %s was not approved",

1770

1506

client.name)

1776

1512

#wait until timeout or approved

1777

1513

time = datetime.datetime.now()

1778

1514

client.changedstate.acquire()

1779

client.changedstate.wait(delay.total_seconds())

1515

(client.changedstate.wait

1516

(float(client._timedelta_to_milliseconds(delay)

1517

/ 1000)))

1780

1518

client.changedstate.release()

1781

1519

time2 = datetime.datetime.now()

1782

1520

if (time2 - time) >= delay:

1798

1536

try:

1799

1537

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

1800

1538

except gnutls.errors.GNUTLSError as error:

1801

logger.warning("gnutls send failed",

1802

exc_info=error)

1539

logger.warning("gnutls send failed")

1803

1540

return

1804

1541

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

1805

1542

sent, len(client.secret)

1808

1545

1809

1546

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

1810

1547

# bump the timeout using extended_timeout

1811

client.bump_timeout(client.extended_timeout)

1548

client.checked_ok(client.extended_timeout)

1812

1549

if self.server.use_dbus:

1813

1550

# Emit D-Bus signal

1814

1551

client.GotSecret()

1819

1556

try:

1820

1557

session.bye()

1821

1558

except gnutls.errors.GNUTLSError as error:

1822

logger.warning("GnuTLS bye failed",

1823

exc_info=error)

1559

logger.warning("GnuTLS bye failed")

1824

1560

1825

1561

@staticmethod

1826

1562

def peer_certificate(session):

1882

1618

# Convert the buffer to a Python bytestring

1883

1619

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

1884

1620

# Convert the bytestring to hexadecimal notation

1885

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

1621

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

1886

1622

return hex_fpr

1887

1623

1888

1624

1891

1627

def sub_process_main(self, request, address):

1892

1628

try:

1893

1629

self.finish_request(request, address)

1894

except Exception:

1630

except:

1895

1631

self.handle_error(request, address)

1896

1632

self.close_request(request)

1897

1633

1898

1634

def process_request(self, request, address):

1899

1635

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

1900

1636

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

1901

args = (request, address))

1637

args = (request,

1638

address))

1902

1639

proc.start()

1903

1640

return proc

1904

1641

1919

1656

1920

1657

def add_pipe(self, parent_pipe, proc):

1921

1658

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

1922

raise NotImplementedError()

1659

raise NotImplementedError

1923

1660

1924

1661

1925

1662

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1932

1669

use_ipv6: Boolean; to use IPv6 or not

1933

1670

"""

1934

1671

def __init__(self, server_address, RequestHandlerClass,

1935

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

1936

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

1937

creating a new one with socket.socket().

1938

"""

1672

interface=None, use_ipv6=True):

1939

1673

self.interface = interface

1940

1674

if use_ipv6:

1941

1675

self.address_family = socket.AF_INET6

1942

if socketfd is not None:

1943

# Save the file descriptor

1944

self.socketfd = socketfd

1945

# Save the original socket.socket() function

1946

self.socket_socket = socket.socket

1947

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

1948

#

1949

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

1950

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

1951

# patching socket.socket.)

1952

#

1953

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

1954

@functools.wraps(socket.socket)

1955

def socket_wrapper(*args, **kwargs):

1956

# Restore original function so subsequent calls are

1957

# not affected.

1958

socket.socket = self.socket_socket

1959

del self.socket_socket

1960

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

1961

# saved file descriptor.

1962

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

1963

# Replace socket.socket() function with wrapper

1964

socket.socket = socket_wrapper

1965

# The socketserver.TCPServer.__init__ will call

1966

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

1967

# socket_wrapper(), if socketfd was set.

1968

1676

socketserver.TCPServer.__init__(self, server_address,

1969

1677

RequestHandlerClass)

1970

1971

1678

def server_bind(self):

1972

1679

"""This overrides the normal server_bind() function

1973

1680

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

1981

1688

try:

1982

1689

self.socket.setsockopt(socket.SOL_SOCKET,

1983

1690

SO_BINDTODEVICE,

1984

(self.interface + "\0")

1985

.encode("utf-8"))

1691

str(self.interface

1692

+ '\0'))

1986

1693

except socket.error as error:

1987

if error.errno == errno.EPERM:

1988

logger.error("No permission to bind to"

1989

" interface %s", self.interface)

1990

elif error.errno == errno.ENOPROTOOPT:

1694

if error[0] == errno.EPERM:

1695

logger.error("No permission to"

1696

" bind to interface %s",

1697

self.interface)

1698

elif error[0] == errno.ENOPROTOOPT:

1991

1699

logger.error("SO_BINDTODEVICE not available;"

1992

1700

" cannot bind to interface %s",

1993

1701

self.interface)

1994

elif error.errno == errno.ENODEV:

1995

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

1996

" cannot bind", self.interface)

1997

1702

else:

1998

1703

raise

1999

1704

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

2002

1707

if self.address_family == socket.AF_INET6:

2003

1708

any_address = "::" # in6addr_any

2004

1709

else:

2005

any_address = "0.0.0.0" # INADDR_ANY

1710

any_address = socket.INADDR_ANY

2006

1711

self.server_address = (any_address,

2007

1712

self.server_address[1])

2008

1713

elif not self.server_address[1]:

2029

1734

"""

2030

1735

def __init__(self, server_address, RequestHandlerClass,

2031

1736

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

2032

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

1737

gnutls_priority=None, use_dbus=True):

2033

1738

self.enabled = False

2034

1739

self.clients = clients

2035

1740

if self.clients is None:

2039

1744

IPv6_TCPServer.__init__(self, server_address,

2040

1745

RequestHandlerClass,

2041

1746

interface = interface,

2042

use_ipv6 = use_ipv6,

2043

socketfd = socketfd)

1747

use_ipv6 = use_ipv6)

2044

1748

def server_activate(self):

2045

1749

if self.enabled:

2046

1750

return socketserver.TCPServer.server_activate(self)

2059

1763

2060

1764

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

2061

1765

proc = None, client_object=None):

1766

condition_names = {

1767

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

1768

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

1769

# blocking).

1770

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

1771

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

1772

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

1773

# broken, usually for pipes and

1774

# sockets).

1775

}

1776

conditions_string = ' | '.join(name

1777

for cond, name in

1778

condition_names.iteritems()

1779

if cond & condition)

2062

1780

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

2063

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

1781

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

2064

1782

# Wait for other process to exit

2065

1783

proc.join()

2066

1784

return False

2124

1842

return True

2125

1843

2126

1844

2127

def rfc3339_duration_to_delta(duration):

2128

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

2129

2130

>>> rfc3339_duration_to_delta("P7D")

2131

datetime.timedelta(7)

2132

>>> rfc3339_duration_to_delta("PT60S")

2133

datetime.timedelta(0, 60)

2134

>>> rfc3339_duration_to_delta("PT60M")

2135

datetime.timedelta(0, 3600)

2136

>>> rfc3339_duration_to_delta("PT24H")

2137

datetime.timedelta(1)

2138

>>> rfc3339_duration_to_delta("P1W")

2139

datetime.timedelta(7)

2140

>>> rfc3339_duration_to_delta("PT5M30S")

2141

datetime.timedelta(0, 330)

2142

>>> rfc3339_duration_to_delta("P1DT3M20S")

2143

datetime.timedelta(1, 200)

2144

"""

2145

2146

# Parsing an RFC 3339 duration with regular expressions is not

2147

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

2148

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

2149

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

2150

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

2151

# avoid excessive use of external libraries.

2152

2153

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

2154

Token = collections.namedtuple("Token",

2155

("regexp", # To match token; if

2156

# "value" is not None,

2157

# must have a "group"

2158

# containing digits

2159

"value", # datetime.timedelta or

2160

# None

2161

"followers")) # Tokens valid after

2162

# this token

2163

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

2164

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

2165

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

2166

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

2167

datetime.timedelta(seconds=1),

2168

frozenset((token_end,)))

2169

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

2170

datetime.timedelta(minutes=1),

2171

frozenset((token_second, token_end)))

2172

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

2173

datetime.timedelta(hours=1),

2174

frozenset((token_minute, token_end)))

2175

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

2176

None,

2177

frozenset((token_hour, token_minute,

2178

token_second)))

2179

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

2180

datetime.timedelta(days=1),

2181

frozenset((token_time, token_end)))

2182

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

2183

datetime.timedelta(weeks=4),

2184

frozenset((token_day, token_end)))

2185

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

2186

datetime.timedelta(weeks=52),

2187

frozenset((token_month, token_end)))

2188

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

2189

datetime.timedelta(weeks=1),

2190

frozenset((token_end,)))

2191

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

2192

frozenset((token_year, token_month,

2193

token_day, token_time,

2194

token_week)))

2195

# Define starting values

2196

value = datetime.timedelta() # Value so far

2197

found_token = None

2198

followers = frozenset((token_duration,)) # Following valid tokens

2199

s = duration # String left to parse

2200

# Loop until end token is found

2201

while found_token is not token_end:

2202

# Search for any currently valid tokens

2203

for token in followers:

2204

match = token.regexp.match(s)

2205

if match is not None:

2206

# Token found

2207

if token.value is not None:

2208

# Value found, parse digits

2209

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

2210

# Add to value so far

2211

value += factor * token.value

2212

# Strip token from string

2213

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

2214

# Go to found token

2215

found_token = token

2216

# Set valid next tokens

2217

followers = found_token.followers

2218

break

2219

else:

2220

# No currently valid tokens were found

2221

raise ValueError("Invalid RFC 3339 duration")

2222

# End token found

2223

return value

2224

2225

2226

1845

def string_to_delta(interval):

2227

1846

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

2228

1847

2239

1858

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

2240

1859

datetime.timedelta(0, 330)

2241

1860

"""

2242

2243

try:

2244

return rfc3339_duration_to_delta(interval)

2245

except ValueError:

2246

pass

2247

2248

1861

timevalue = datetime.timedelta(0)

2249

1862

for s in interval.split():

2250

1863

try:

2251

suffix = s[-1]

1864

suffix = unicode(s[-1])

2252

1865

value = int(s[:-1])

2253

1866

if suffix == "d":

2254

1867

delta = datetime.timedelta(value)

2261

1874

elif suffix == "w":

2262

1875

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

2263

1876

else:

2264

raise ValueError("Unknown suffix {!r}"

2265

.format(suffix))

2266

except IndexError as e:

1877

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

1878

except (ValueError, IndexError) as e:

2267

1879

raise ValueError(*(e.args))

2268

1880

timevalue += delta

2269

1881

return timevalue

2282

1894

sys.exit()

2283

1895

if not noclose:

2284

1896

# Close all standard open file descriptors

2285

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

1897

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

2286

1898

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

2287

raise OSError(errno.ENODEV, "{} not a character device"

2288

.format(os.devnull))

1899

raise OSError(errno.ENODEV,

1900

"%s not a character device"

1901

% os.path.devnull)

2289

1902

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

2290

1903

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

2291

1904

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

2300

1913

2301

1914

parser = argparse.ArgumentParser()

2302

1915

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

2303

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

1916

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

2304

1917

help="show version number and exit")

2305

1918

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

2306

1919

help="Bind to interface IF")

2312

1925

help="Run self-test")

2313

1926

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

2314

1927

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

2315

" to terminal", default=None)

1928

" to terminal")

2316

1929

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

2317

1930

help="Debug level for stdout output")

2318

1931

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

2325

1938

" files")

2326

1939

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

2327

1940

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

2328

" system bus interface", default=None)

1941

" system bus interface")

2329

1942

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

2330

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

2331

default=None)

1943

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

2332

1944

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

2333

1945

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

2334

" state", default=None)

2335

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

2336

help="Specify a file descriptor to a network"

2337

" socket to use instead of creating one")

2338

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

2339

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

2340

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

2341

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

2342

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

2343

dest="zeroconf", help="Do not use Zeroconf",

2344

default=None)

1946

" state", default=True)

2345

1947

2346

1948

options = parser.parse_args()

2347

1949

2348

1950

if options.check:

2349

1951

import doctest

2350

fail_count, test_count = doctest.testmod()

2351

sys.exit(os.EX_OK if fail_count == 0 else 1)

1952

doctest.testmod()

1953

sys.exit()

2352

1954

2353

1955

# Default values for config file for server-global settings

2354

1956

server_defaults = { "interface": "",

2356

1958

"port": "",

2357

1959

"debug": "False",

2358

1960

"priority":

2359

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

1961

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

2360

1962

"servicename": "Mandos",

2361

1963

"use_dbus": "True",

2362

1964

"use_ipv6": "True",

2363

1965

"debuglevel": "",

2364

"restore": "True",

2365

"socket": "",

2366

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

2367

"foreground": "False",

2368

"zeroconf": "True",

2369

1966

}

2370

1967

2371

1968

# Parse config file for server-global settings

2376

1973

# Convert the SafeConfigParser object to a dict

2377

1974

server_settings = server_config.defaults()

2378

1975

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

2379

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

1976

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

2380

1977

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

2381

1978

option)

2382

1979

if server_settings["port"]:

2383

1980

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

2384

1981

"port")

2385

if server_settings["socket"]:

2386

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

2387

"socket")

2388

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

2389

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

2390

# happen with a supplied network socket.

2391

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

2392

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

2393

["socket"])

2394

1982

del server_config

2395

1983

2396

1984

# Override the settings from the config file with command line

2397

1985

# options, if set.

2398

1986

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

2399

1987

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

2400

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

2401

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

1988

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

2402

1989

value = getattr(options, option)

2403

1990

if value is not None:

2404

1991

server_settings[option] = value

2405

1992

del options

2406

1993

# Force all strings to be unicode

2407

1994

for option in server_settings.keys():

2408

if isinstance(server_settings[option], bytes):

2409

server_settings[option] = (server_settings[option]

2410

.decode("utf-8"))

2411

# Force all boolean options to be boolean

2412

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

2413

"foreground", "zeroconf"):

2414

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

2415

# Debug implies foreground

2416

if server_settings["debug"]:

2417

server_settings["foreground"] = True

1995

if type(server_settings[option]) is str:

1996

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

2418

1997

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

2419

1998

2420

1999

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

2421

2000

2422

if (not server_settings["zeroconf"] and

2423

not (server_settings["port"]

2424

or server_settings["socket"] != "")):

2425

parser.error("Needs port or socket to work without"

2426

" Zeroconf")

2427

2428

2001

# For convenience

2429

2002

debug = server_settings["debug"]

2430

2003

debuglevel = server_settings["debuglevel"]

2431

2004

use_dbus = server_settings["use_dbus"]

2432

2005

use_ipv6 = server_settings["use_ipv6"]

2433

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

2434

stored_state_file)

2435

foreground = server_settings["foreground"]

2436

zeroconf = server_settings["zeroconf"]

2437

2006

2438

2007

if debug:

2439

initlogger(debug, logging.DEBUG)

2008

initlogger(logging.DEBUG)

2440

2009

else:

2441

2010

if not debuglevel:

2442

initlogger(debug)

2011

initlogger()

2443

2012

else:

2444

2013

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

2445

initlogger(debug, level)

2014

initlogger(level)

2446

2015

2447

2016

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

2448

2017

syslogger.setFormatter(logging.Formatter

2449

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

2450

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

2451

.format(server_settings

2452

["servicename"])))

2018

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

2019

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

2020

% server_settings["servicename"]))

2453

2021

2454

2022

# Parse config file with clients

2455

client_config = configparser.SafeConfigParser(Client

2456

.client_defaults)

2023

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

2024

"extended_timeout": "15m",

2025

"interval": "2m",

2026

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

2027

"host": "",

2028

"approval_delay": "0s",

2029

"approval_duration": "1s",

2030

}

2031

client_config = configparser.SafeConfigParser(client_defaults)

2457

2032

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

2458

2033

"clients.conf"))

2459

2034

2460

2035

global mandos_dbus_service

2461

2036

mandos_dbus_service = None

2462

2037

2463

socketfd = None

2464

if server_settings["socket"] != "":

2465

socketfd = server_settings["socket"]

2466

2038

tcp_server = MandosServer((server_settings["address"],

2467

2039

server_settings["port"]),

2468

2040

ClientHandler,

2471

2043

use_ipv6=use_ipv6,

2472

2044

gnutls_priority=

2473

2045

server_settings["priority"],

2474

use_dbus=use_dbus,

2475

socketfd=socketfd)

2476

if not foreground:

2477

pidfilename = "/run/mandos.pid"

2478

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

2479

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

2480

pidfile = None

2046

use_dbus=use_dbus)

2047

if not debug:

2048

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

2481

2049

try:

2482

2050

pidfile = open(pidfilename, "w")

2483

except IOError as e:

2484

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

2485

exc_info=e)

2051

except IOError:

2052

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

2486

2053

2487

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

2054

try:

2055

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

2056

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

2057

except KeyError:

2488

2058

try:

2489

uid = pwd.getpwnam(name).pw_uid

2490

gid = pwd.getpwnam(name).pw_gid

2491

break

2059

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

2060

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

2492

2061

except KeyError:

2493

continue

2494

else:

2495

uid = 65534

2496

gid = 65534

2062

try:

2063

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

2064

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

2065

except KeyError:

2066

uid = 65534

2067

gid = 65534

2497

2068

try:

2498

2069

os.setgid(gid)

2499

2070

os.setuid(uid)

2500

2071

except OSError as error:

2501

if error.errno != errno.EPERM:

2502

raise

2072

if error[0] != errno.EPERM:

2073

raise error

2503

2074

2504

2075

if debug:

2505

2076

# Enable all possible GnuTLS debugging

2516

2087

.gnutls_global_set_log_function(debug_gnutls))

2517

2088

2518

2089

# Redirect stdin so all checkers get /dev/null

2519

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

2090

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

2520

2091

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

2521

2092

if null > 2:

2522

2093

os.close(null)

2094

else:

2095

# No console logging

2096

logger.removeHandler(console)

2523

2097

2524

2098

# Need to fork before connecting to D-Bus

2525

if not foreground:

2099

if not debug:

2526

2100

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

2527

2101

daemon()

2528

2102

2529

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

2530

# need to inform gobject that threads will be used.

2531

gobject.threads_init()

2532

2533

2103

global main_loop

2534

2104

# From the Avahi example code

2535

DBusGMainLoop(set_as_default=True)

2105

DBusGMainLoop(set_as_default=True )

2536

2106

main_loop = gobject.MainLoop()

2537

2107

bus = dbus.SystemBus()

2538

2108

# End of Avahi example code

2544

2114

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

2545

2115

do_not_queue=True))

2546

2116

except dbus.exceptions.NameExistsException as e:

2547

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

2117

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

2548

2118

use_dbus = False

2549

2119

server_settings["use_dbus"] = False

2550

2120

tcp_server.use_dbus = False

2551

if zeroconf:

2552

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2553

service = AvahiServiceToSyslog(name =

2554

server_settings["servicename"],

2555

servicetype = "_mandos._tcp",

2556

protocol = protocol, bus = bus)

2557

if server_settings["interface"]:

2558

service.interface = (if_nametoindex

2559

(server_settings["interface"]

2560

.encode("utf-8")))

2121

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2122

service = AvahiServiceToSyslog(name =

2123

server_settings["servicename"],

2124

servicetype = "_mandos._tcp",

2125

protocol = protocol, bus = bus)

2126

if server_settings["interface"]:

2127

service.interface = (if_nametoindex

2128

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

2561

2129

2562

2130

global multiprocessing_manager

2563

2131

multiprocessing_manager = multiprocessing.Manager()

2564

2132

2565

2133

client_class = Client

2566

2134

if use_dbus:

2567

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

2568

2569

client_settings = Client.config_parser(client_config)

2135

client_class = functools.partial(ClientDBusTransitional,

2136

bus = bus)

2137

2138

special_settings = {

2139

# Some settings need to be accessd by special methods;

2140

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

2141

"approved_by_default":

2142

lambda section:

2143

client_config.getboolean(section, "approved_by_default"),

2144

}

2145

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

2146

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

2147

# with exceptions for any special settings as defined above

2148

client_settings = dict((clientname,

2149

dict((setting,

2150

(value

2151

if setting not in special_settings

2152

else special_settings[setting]

2153

(clientname)))

2154

for setting, value in

2155

client_config.items(clientname)))

2156

for clientname in client_config.sections())

2157

2570

2158

old_client_settings = {}

2571

clients_data = {}

2572

2573

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

2574

global wnull

2575

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

2576

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

2577

# mode

2578

if debug or not foreground:

2579

wnull.close()

2159

clients_data = []

2580

2160

2581

2161

# Get client data and settings from last running state.

2582

2162

if server_settings["restore"]:

2586

2166

(stored_state))

2587

2167

os.remove(stored_state_path)

2588

2168

except IOError as e:

2589

if e.errno == errno.ENOENT:

2590

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

2591

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

2592

else:

2593

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

2594

exc_info=e)

2169

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

2170

.format(e))

2171

if e.errno != errno.ENOENT:

2595

2172

raise

2596

except EOFError as e:

2597

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

2598

"EOFError:", exc_info=e)

2599

2173

2600

with PGPEngine() as pgp:

2601

for client_name, client in clients_data.items():

2602

# Skip removed clients

2603

if client_name not in client_settings:

2604

continue

2605

2606

# Decide which value to use after restoring saved state.

2607

# We have three different values: Old config file,

2608

# new config file, and saved state.

2609

# New config value takes precedence if it differs from old

2610

# config value, otherwise use saved state.

2611

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

2612

try:

2613

# For each value in new config, check if it

2614

# differs from the old config value (Except for

2615

# the "secret" attribute)

2616

if (name != "secret" and

2617

value != old_client_settings[client_name]

2618

[name]):

2619

client[name] = value

2620

except KeyError:

2621

pass

2622

2623

# Clients who has passed its expire date can still be

2624

# enabled if its last checker was successful. Clients

2625

# whose checker succeeded before we stored its state is

2626

# assumed to have successfully run all checkers during

2627

# downtime.

2628

if client["enabled"]:

2629

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

2630

if not client["last_checked_ok"]:

2631

logger.warning(

2632

"disabling client {} - Client never "

2633

"performed a successful checker"

2634

.format(client_name))

2635

client["enabled"] = False

2636

elif client["last_checker_status"] != 0:

2637

logger.warning(

2638

"disabling client {} - Client last"

2639

" checker failed with error code {}"

2640

.format(client_name,

2641

client["last_checker_status"]))

2642

client["enabled"] = False

2643

else:

2644

client["expires"] = (datetime.datetime

2645

.utcnow()

2646

+ client["timeout"])

2647

logger.debug("Last checker succeeded,"

2648

" keeping {} enabled"

2649

.format(client_name))

2174

for client in clients_data:

2175

client_name = client["name"]

2176

2177

# Decide which value to use after restoring saved state.

2178

# We have three different values: Old config file,

2179

# new config file, and saved state.

2180

# New config value takes precedence if it differs from old

2181

# config value, otherwise use saved state.

2182

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

2650

2183

try:

2651

client["secret"] = (

2652

pgp.decrypt(client["encrypted_secret"],

2653

client_settings[client_name]

2654

["secret"]))

2655

except PGPError:

2656

# If decryption fails, we use secret from new settings

2657

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

2658

.format(client_name))

2659

client["secret"] = (

2660

client_settings[client_name]["secret"])

2661

2662

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

2663

for client_name in (set(old_client_settings)

2664

- set(client_settings)):

2665

del clients_data[client_name]

2666

for client_name in (set(client_settings)

2667

- set(old_client_settings)):

2668

clients_data[client_name] = client_settings[client_name]

2669

2670

# Create all client objects

2671

for client_name, client in clients_data.items():

2672

tcp_server.clients[client_name] = client_class(

2673

name = client_name, settings = client,

2674

server_settings = server_settings)

2184

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

2185

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

2186

# attribute)

2187

if (name != "secret" and

2188

value != old_client_settings[client_name][name]):

2189

setattr(client, name, value)

2190

except KeyError:

2191

pass

2192

2193

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

2194

# if its last checker was sucessful. Clients who checkers

2195

# failed before we stored it state is asumed to had failed

2196

# checker during downtime.

2197

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

2198

if ((datetime.datetime.utcnow()

2199

- client["last_checked_ok"]) > client["interval"]):

2200

if client["last_checker_status"] != 0:

2201

client["enabled"] = False

2202

else:

2203

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

2204

+ client["timeout"])

2205

2206

client["changedstate"] = (multiprocessing_manager

2207

.Condition(multiprocessing_manager

2208

.Lock()))

2209

if use_dbus:

2210

new_client = (ClientDBusTransitional.__new__

2211

(ClientDBusTransitional))

2212

tcp_server.clients[client_name] = new_client

2213

new_client.bus = bus

2214

for name, value in client.iteritems():

2215

setattr(new_client, name, value)

2216

client_object_name = unicode(client_name).translate(

2217

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

2218

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

2219

new_client.dbus_object_path = (dbus.ObjectPath

2220

("/clients/"

2221

+ client_object_name))

2222

DBusObjectWithProperties.__init__(new_client,

2223

new_client.bus,

2224

new_client

2225

.dbus_object_path)

2226

else:

2227

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

2228

for name, value in client.iteritems():

2229

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

2230

2231

tcp_server.clients[client_name].decrypt_secret(

2232

client_settings[client_name]["secret"])

2233

2234

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

2235

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

2236

del tcp_server.clients[clientname]

2237

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

2238

tcp_server.clients[clientname] = (client_class(name

2239

= clientname,

2240

config =

2241

client_settings

2242

[clientname]))

2675

2243

2676

2244

if not tcp_server.clients:

2677

2245

logger.warning("No clients defined")

2678

2679

if not foreground:

2680

if pidfile is not None:

2681

try:

2682

with pidfile:

2683

pid = os.getpid()

2684

pidfile.write("{}\n".format(pid).encode("utf-8"))

2685

except IOError:

2686

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

2687

pidfilename, pid)

2688

del pidfile

2246

2247

if not debug:

2248

try:

2249

with pidfile:

2250

pid = os.getpid()

2251

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

2252

del pidfile

2253

except IOError:

2254

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

2255

pidfilename, pid)

2256

except NameError:

2257

# "pidfile" was never created

2258

pass

2689

2259

del pidfilename

2260

2261

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

2690

2262

2691

2263

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

2692

2264

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

2693

2265

2694

2266

if use_dbus:

2695

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

2696

"se.bsnet.fukt.Mandos"})

2697

class MandosDBusService(DBusObjectWithProperties):

2267

class MandosDBusService(dbus.service.Object):

2698

2268

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

2699

2269

def __init__(self):

2700

2270

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

2701

2271

_interface = "se.recompile.Mandos"

2702

2272

2703

@dbus_interface_annotations(_interface)

2704

def _foo(self):

2705

return { "org.freedesktop.DBus.Property"

2706

".EmitsChangedSignal":

2707

"false"}

2708

2709

2273

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

2710

2274

def ClientAdded(self, objpath):

2711

2275

"D-Bus signal"

2733

2297

def GetAllClientsWithProperties(self):

2734

2298

"D-Bus method"

2735

2299

return dbus.Dictionary(

2736

{ c.dbus_object_path: c.GetAll("")

2737

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

2300

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

2301

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

2738

2302

signature="oa{sv}")

2739

2303

2740

2304

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

2753

2317

2754

2318

del _interface

2755

2319

2756

mandos_dbus_service = MandosDBusService()

2320

class MandosDBusServiceTransitional(MandosDBusService):

2321

__metaclass__ = AlternateDBusNamesMetaclass

2322

mandos_dbus_service = MandosDBusServiceTransitional()

2757

2323

2758

2324

def cleanup():

2759

2325

"Cleanup function; run on exit"

2760

if zeroconf:

2761

service.cleanup()

2326

service.cleanup()

2762

2327

2763

2328

multiprocessing.active_children()

2764

wnull.close()

2765

2329

if not (tcp_server.clients or client_settings):

2766

2330

return

2767

2331

2768

2332

# Store client before exiting. Secrets are encrypted with key

2769

2333

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

2770

2334

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

2771

clients = {}

2772

with PGPEngine() as pgp:

2773

for client in tcp_server.clients.itervalues():

2774

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

2775

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

2776

key)

2777

client_dict = {}

2778

2779

# A list of attributes that can not be pickled

2780

# + secret.

2781

exclude = { "bus", "changedstate", "secret",

2782

"checker", "server_settings" }

2783

for name, typ in (inspect.getmembers

2784

(dbus.service.Object)):

2785

exclude.add(name)

2786

2787

client_dict["encrypted_secret"] = (client

2788

.encrypted_secret)

2789

for attr in client.client_structure:

2790

if attr not in exclude:

2791

client_dict[attr] = getattr(client, attr)

2792

2793

clients[client.name] = client_dict

2794

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

2795

2335

clients = []

2336

for client in tcp_server.clients.itervalues():

2337

client.encrypt_secret(client_settings[client.name]

2338

["secret"])

2339

2340

client_dict = {}

2341

2342

# A list of attributes that will not be stored when

2343

# shutting down.

2344

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

2345

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

2346

exclude.add(name)

2347

2348

client_dict["encrypted_secret"] = client.encrypted_secret

2349

for attr in client.client_structure:

2350

if attr not in exclude:

2351

client_dict[attr] = getattr(client, attr)

2352

2353

clients.append(client_dict)

2354

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

2355

2796

2356

try:

2797

with (tempfile.NamedTemporaryFile

2798

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

2799

dir=os.path.dirname(stored_state_path),

2800

delete=False)) as stored_state:

2357

with os.fdopen(os.open(stored_state_path,

2358

os.O_CREAT|os.O_WRONLY|os.O_TRUNC,

2359

0600), "wb") as stored_state:

2801

2360

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

2802

tempname=stored_state.name

2803

os.rename(tempname, stored_state_path)

2804

except (IOError, OSError) as e:

2805

if not debug:

2806

try:

2807

os.remove(tempname)

2808

except NameError:

2809

pass

2810

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

2811

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

2812

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

2813

else:

2814

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

2815

exc_info=e)

2361

except IOError as e:

2362

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

2363

.format(e))

2364

if e.errno != errno.ENOENT:

2816

2365

raise

2817

2366

2818

2367

# Delete all clients, and settings from config

2838

2387

# Need to initiate checking of clients

2839

2388

if client.enabled:

2840

2389

client.init_checker()

2390

2841

2391

2842

2392

tcp_server.enable()

2843

2393

tcp_server.server_activate()

2844

2394

2845

2395

# Find out what port we got

2846

if zeroconf:

2847

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

2396

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

2848

2397

if use_ipv6:

2849

2398

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

2850

" flowinfo %d, scope_id %d",

2851

*tcp_server.socket.getsockname())

2399

" flowinfo %d, scope_id %d"

2400

% tcp_server.socket.getsockname())

2852

2401

else: # IPv4

2853

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

2854

*tcp_server.socket.getsockname())

2402

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

2403

% tcp_server.socket.getsockname())

2855

2404

2856

2405

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

2857

2406

2858

2407

try:

2859

if zeroconf:

2860

# From the Avahi example code

2861

try:

2862

service.activate()

2863

except dbus.exceptions.DBusException as error:

2864

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

2865

cleanup()

2866

sys.exit(1)

2867

# End of Avahi example code

2408

# From the Avahi example code

2409

try:

2410

service.activate()

2411

except dbus.exceptions.DBusException as error:

2412

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

2413

cleanup()

2414

sys.exit(1)

2415

# End of Avahi example code

2868

2416

2869

2417

gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,

2870

2418

lambda *args, **kwargs:

2874

2422

logger.debug("Starting main loop")

2875

2423

main_loop.run()

2876

2424

except AvahiError as error:

2877

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

2425

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

2878

2426

cleanup()

2879

2427

sys.exit(1)

2880

2428

except KeyboardInterrupt:

2885

2433

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

2886

2434

cleanup()

2887

2435

2436

2888

2437

if __name__ == '__main__':

2889

2438

main()