/mandos/trunk : revision 493

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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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# along with this program. If not, see

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# <http://www.gnu.org/licenses/>.

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#

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# Contact the authors at <mandos@recompile.se>.

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# Contact the authors at <mandos@fukt.bsnet.se>.

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#

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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 functools

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import dbus

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import dbus.service

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except ImportError:

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SO_BINDTODEVICE = None

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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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logger = logging.getLogger()

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syslogger = None

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try:

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if_nametoindex = ctypes.cdll.LoadLibrary(

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

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(b"16s16x", interface))

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

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return interface_index

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

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler(

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facility = 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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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(

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dir=self.tempdir) 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(

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dir = self.tempdir) 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 = 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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version = "1.3.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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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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class AvahiGroupError(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,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

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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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protocol = avahi.PROTO_UNSPEC, bus = None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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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(

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self.server.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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

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

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self.name)

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if remove:

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self.remove()

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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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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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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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}".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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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

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

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bad_states = {

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avahi.SERVER_INVALID: "Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION: "Zeroconf server name collision",

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avahi.SERVER_FAILURE: "Zeroconf server failure",

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}

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bad_states = { avahi.SERVER_INVALID:

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"Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

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"Zeroconf server name collision",

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avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

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if state in bad_states:

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if bad_states[state] is not None:

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if error is None:

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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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follow_name_owner_changes=True),

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avahi.DBUS_INTERFACE_SERVER)

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self.server.connect_to_signal("StateChanged",

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self.server_state_changed)

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self.server_state_changed)

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

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404

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class AvahiServiceToSyslog(AvahiService):

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

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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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syslogger.setFormatter(logging.Formatter(

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

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.format(self.name)))

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return ret

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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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 = {

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"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.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the

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# fingerprint() function

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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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)

312

+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return self._timedelta_to_milliseconds(self.timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return self._timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return self._timedelta_to_milliseconds(self.approval_delay)

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

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

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

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attribute."""

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self.name = name

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if server_settings is None:

529

server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.items():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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if config is None:

332

config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

340

if "secret" in config:

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

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elif "secfile" in config:

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

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(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

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

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self.created = datetime.datetime.utcnow()

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self.enabled = False

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self.last_approval_request = None

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self.last_enabled = None

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self.last_checked_ok = None

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

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

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self.disable_hook = disable_hook

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

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self.current_checker_command = None

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self.approved = None

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self.last_connect = None

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self._approved = None

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

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True)

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self.approvals_pending = 0

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self.changedstate = multiprocessing_manager.Condition(

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multiprocessing_manager.Lock())

560

self.client_structure = [attr

561

for attr in self.__dict__.iterkeys()

562

if not attr.startswith("_")]

563

self.client_structure.append("client_structure")

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for name, t in inspect.getmembers(

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type(self), lambda obj: isinstance(obj, property)):

567

if not name.startswith("_"):

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self.client_structure.append(name)

370

self.approval_delay = string_to_delta(

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config["approval_delay"])

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self.approval_duration = string_to_delta(

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config["approval_duration"])

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

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# Send notice to process children that client state has changed

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def send_changedstate(self):

572

with self.changedstate:

573

self.changedstate.notify_all()

574

377

self.changedstate.acquire()

378

self.changedstate.notify_all()

379

self.changedstate.release()

380

575

381

def enable(self):

576

382

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

577

383

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

578

384

# Already enabled

579

385

return

580

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

581

self.enabled = True

386

self.send_changedstate()

582

387

self.last_enabled = datetime.datetime.utcnow()

583

self.init_checker()

584

self.send_changedstate()

388

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

389

# and every interval from then on.

390

self.checker_initiator_tag = (gobject.timeout_add

391

(self.interval_milliseconds(),

392

self.start_checker))

393

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

394

self.disable_initiator_tag = (gobject.timeout_add

395

(self.timeout_milliseconds(),

396

self.disable))

397

self.enabled = True

398

# Also start a new checker *right now*.

399

self.start_checker()

585

400

586

401

def disable(self, quiet=True):

587

402

"""Disable this client."""

588

403

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

589

404

return False

590

405

if not quiet:

406

self.send_changedstate()

407

if not quiet:

591

408

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

592

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

409

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

593

410

gobject.source_remove(self.disable_initiator_tag)

594

411

self.disable_initiator_tag = None

595

self.expires = None

596

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

412

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

597

413

gobject.source_remove(self.checker_initiator_tag)

598

414

self.checker_initiator_tag = None

599

415

self.stop_checker()

416

if self.disable_hook:

417

self.disable_hook(self)

600

418

self.enabled = False

601

if not quiet:

602

self.send_changedstate()

603

419

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

604

420

return False

605

421

606

422

def __del__(self):

423

self.disable_hook = None

607

424

self.disable()

608

425

609

def init_checker(self):

610

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

611

# and every interval from then on.

612

if self.checker_initiator_tag is not None:

613

gobject.source_remove(self.checker_initiator_tag)

614

self.checker_initiator_tag = gobject.timeout_add(

615

int(self.interval.total_seconds() * 1000),

616

self.start_checker)

617

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

618

if self.disable_initiator_tag is not None:

619

gobject.source_remove(self.disable_initiator_tag)

620

self.disable_initiator_tag = gobject.timeout_add(

621

int(self.timeout.total_seconds() * 1000), self.disable)

622

# Also start a new checker *right now*.

623

self.start_checker()

624

625

426

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

626

427

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

627

428

self.checker_callback_tag = None

628

429

self.checker = None

629

430

if os.WIFEXITED(condition):

630

self.last_checker_status = os.WEXITSTATUS(condition)

631

if self.last_checker_status == 0:

431

exitstatus = os.WEXITSTATUS(condition)

432

if exitstatus == 0:

632

433

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

633

434

vars(self))

634

435

self.checked_ok()

635

436

else:

636

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

437

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

438

vars(self))

637

439

else:

638

self.last_checker_status = -1

639

440

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

640

441

vars(self))

641

442

642

443

def checked_ok(self):

643

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

444

"""Bump up the timeout for this client.

445

446

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

447

alive and well.

448

"""

644

449

self.last_checked_ok = datetime.datetime.utcnow()

645

self.last_checker_status = 0

646

self.bump_timeout()

647

648

def bump_timeout(self, timeout=None):

649

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

650

if timeout is None:

651

timeout = self.timeout

652

if self.disable_initiator_tag is not None:

653

gobject.source_remove(self.disable_initiator_tag)

654

self.disable_initiator_tag = None

655

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

656

self.disable_initiator_tag = gobject.timeout_add(

657

int(timeout.total_seconds() * 1000), self.disable)

658

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

450

gobject.source_remove(self.disable_initiator_tag)

451

self.disable_initiator_tag = (gobject.timeout_add

452

(self.timeout_milliseconds(),

453

self.disable))

659

454

660

455

def need_approval(self):

661

456

self.last_approval_request = datetime.datetime.utcnow()

666

461

If a checker already exists, leave it running and do

667

462

nothing."""

668

463

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

669

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

670

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

671

# would inevitably timeout, since no checker would get a

672

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

464

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

465

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

466

# client would inevitably timeout, since no checker would get

467

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

673

468

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

674

469

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

675

470

# should be.

677

472

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

678

473

try:

679

474

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

680

except AttributeError:

681

pass

682

except OSError as error:

683

if error.errno != errno.ECHILD:

684

raise

475

except (AttributeError, OSError) as error:

476

if (isinstance(error, OSError)

477

and error.errno != errno.ECHILD):

478

raise error

685

479

else:

686

480

if pid:

687

481

logger.warning("Checker was a zombie")

690

484

self.current_checker_command)

691

485

# Start a new checker if needed

692

486

if self.checker is None:

693

# Escape attributes for the shell

694

escaped_attrs = {

695

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

696

for attr in self.runtime_expansions }

697

487

try:

698

command = self.checker_command % escaped_attrs

699

except TypeError as error:

700

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

701

self.checker_command,

702

exc_info=error)

703

return True # Try again later

488

# In case checker_command has exactly one % operator

489

command = self.checker_command % self.host

490

except TypeError:

491

# Escape attributes for the shell

492

escaped_attrs = dict(

493

(attr,

494

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

495

errors=

496

'replace')))

497

for attr in

498

self.runtime_expansions)

499

500

try:

501

command = self.checker_command % escaped_attrs

502

except TypeError as error:

503

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

504

' %s', self.checker_command, error)

505

return True # Try again later

704

506

self.current_checker_command = command

705

507

try:

706

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

707

self.name)

508

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

509

command, self.name)

708

510

# We don't need to redirect stdout and stderr, since

709

511

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

710

512

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

711

513

# always replaced by /dev/null.)

712

# The exception is when not debugging but nevertheless

713

# running in the foreground; use the previously

714

# created wnull.

715

popen_args = {}

716

if (not self.server_settings["debug"]

717

and self.server_settings["foreground"]):

718

popen_args.update({"stdout": wnull,

719

"stderr": wnull })

720

514

self.checker = subprocess.Popen(command,

721

515

close_fds=True,

722

shell=True,

723

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, self.checker_callback, data=command)

731

# The checker may have completed before the gobject

732

# watch was added. Check for this.

733

try:

516

shell=True, cwd="/")

517

self.checker_callback_tag = (gobject.child_watch_add

518

(self.checker.pid,

519

self.checker_callback,

520

data=command))

521

# The checker may have completed before the gobject

522

# watch was added. Check for this.

734

523

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

524

if pid:

525

gobject.source_remove(self.checker_callback_tag)

526

self.checker_callback(pid, status, command)

735

527

except OSError as error:

736

if error.errno == errno.ECHILD:

737

# This should never happen

738

logger.error("Child process vanished",

739

exc_info=error)

740

return True

741

raise

742

if pid:

743

gobject.source_remove(self.checker_callback_tag)

744

self.checker_callback(pid, status, command)

528

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

529

error)

745

530

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

746

531

return True

747

532

754

539

return

755

540

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

756

541

try:

757

self.checker.terminate()

542

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

758

543

#time.sleep(0.5)

759

544

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

760

# self.checker.kill()

545

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

761

546

except OSError as error:

762

547

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

763

548

raise

764

549

self.checker = None

765

550

766

767

def dbus_service_property(dbus_interface,

768

signature="v",

769

access="readwrite",

770

byte_arrays=False):

551

def dbus_service_property(dbus_interface, signature="v",

552

access="readwrite", byte_arrays=False):

771

553

"""Decorators for marking methods of a DBusObjectWithProperties to

772

554

become properties on the D-Bus.

773

555

782

564

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

783

565

if byte_arrays and signature != "ay":

784

566

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

785

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

786

567

" signature %r" % signature)

787

568

def decorator(func):

788

569

func._dbus_is_property = True

789

570

func._dbus_interface = dbus_interface

794

575

func._dbus_name = func._dbus_name[:-14]

795

576

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

796

577

return func

797

798

return decorator

799

800

801

def dbus_interface_annotations(dbus_interface):

802

"""Decorator for marking functions returning interface annotations

803

804

Usage:

805

806

@dbus_interface_annotations("org.example.Interface")

807

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

808

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

809

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

810

"false"}

811

"""

812

813

def decorator(func):

814

func._dbus_is_interface = True

815

func._dbus_interface = dbus_interface

816

func._dbus_name = dbus_interface

817

return func

818

819

return decorator

820

821

822

def dbus_annotations(annotations):

823

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

824

Usage:

825

826

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

827

"org.freedesktop.DBus.Property."

828

"EmitsChangedSignal": "false"})

829

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

830

access="r")

831

def Property_dbus_property(self):

832

return dbus.Boolean(False)

833

"""

834

835

def decorator(func):

836

func._dbus_annotations = annotations

837

return func

838

839

578

return decorator

840

579

841

580

842

581

class DBusPropertyException(dbus.exceptions.DBusException):

843

582

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

844

583

"""

845

pass

584

def __unicode__(self):

585

return unicode(str(self))

846

586

847

587

848

588

class DBusPropertyAccessException(DBusPropertyException):

859

599

860

600

class DBusObjectWithProperties(dbus.service.Object):

861

601

"""A D-Bus object with properties.

862

602

863

603

Classes inheriting from this can use the dbus_service_property

864

604

decorator to expose methods as D-Bus properties. It exposes the

865

605

standard Get(), Set(), and GetAll() methods on the D-Bus.

866

606

"""

867

607

868

608

@staticmethod

869

def _is_dbus_thing(thing):

870

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

871

872

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

873

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

874

"""

875

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

876

False)

609

def _is_dbus_property(obj):

610

return getattr(obj, "_dbus_is_property", False)

877

611

878

def _get_all_dbus_things(self, thing):

612

def _get_all_dbus_properties(self):

879

613

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

880

614

"""

881

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

882

athing.__get__(self))

883

for cls in self.__class__.__mro__

884

for name, athing in

885

inspect.getmembers(cls, self._is_dbus_thing(thing)))

615

return ((prop._dbus_name, prop)

616

for name, prop in

617

inspect.getmembers(self, self._is_dbus_property))

886

618

887

619

def _get_dbus_property(self, interface_name, property_name):

888

620

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

889

621

property with the specified name and interface.

890

622

"""

891

for cls in self.__class__.__mro__:

892

for name, value in inspect.getmembers(

893

cls, self._is_dbus_thing("property")):

894

if (value._dbus_name == property_name

895

and value._dbus_interface == interface_name):

896

return value.__get__(self)

897

623

for name in (property_name,

624

property_name + "_dbus_property"):

625

prop = getattr(self, name, None)

626

if (prop is None

627

or not self._is_dbus_property(prop)

628

or prop._dbus_name != property_name

629

or (interface_name and prop._dbus_interface

630

and interface_name != prop._dbus_interface)):

631

continue

632

return prop

898

633

# No such property

899

raise DBusPropertyNotFound("{}:{}.{}".format(

900

self.dbus_object_path, interface_name, property_name))

634

raise DBusPropertyNotFound(self.dbus_object_path + ":"

635

+ interface_name + "."

636

+ property_name)

901

637

902

@dbus.service.method(dbus.PROPERTIES_IFACE,

903

in_signature="ss",

638

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

904

639

out_signature="v")

905

640

def Get(self, interface_name, property_name):

906

641

"""Standard D-Bus property Get() method, see D-Bus standard.

924

659

# The byte_arrays option is not supported yet on

925

660

# signatures other than "ay".

926

661

if prop._dbus_signature != "ay":

927

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

928

"'ay' signature {!r}"

929

.format(prop._dbus_signature))

930

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

931

for byte in value))

662

raise ValueError

663

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

664

for byte in value))

932

665

prop(value)

933

666

934

@dbus.service.method(dbus.PROPERTIES_IFACE,

935

in_signature="s",

667

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

936

668

out_signature="a{sv}")

937

669

def GetAll(self, interface_name):

938

670

"""Standard D-Bus property GetAll() method, see D-Bus

939

671

standard.

940

672

941

673

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

942

674

"""

943

properties = {}

944

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

675

all = {}

676

for name, prop in self._get_all_dbus_properties():

945

677

if (interface_name

946

678

and interface_name != prop._dbus_interface):

947

679

# Interface non-empty but did not match

951

683

continue

952

684

value = prop()

953

685

if not hasattr(value, "variant_level"):

954

properties[name] = value

686

all[name] = value

955

687

continue

956

properties[name] = type(value)(

957

value, variant_level = value.variant_level + 1)

958

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

959

960

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

961

def PropertiesChanged(self, interface_name, changed_properties,

962

invalidated_properties):

963

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

964

standard.

965

"""

966

pass

688

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

689

value.variant_level+1)

690

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

967

691

968

692

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

969

693

out_signature="s",

970

694

path_keyword='object_path',

971

695

connection_keyword='connection')

972

696

def Introspect(self, object_path, connection):

973

"""Overloading of standard D-Bus method.

974

975

Inserts property tags and interface annotation tags.

697

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

976

698

"""

977

699

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

978

700

connection)

979

701

try:

980

702

document = xml.dom.minidom.parseString(xmlstring)

981

982

703

def make_tag(document, name, prop):

983

704

e = document.createElement("property")

984

705

e.setAttribute("name", name)

985

706

e.setAttribute("type", prop._dbus_signature)

986

707

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

987

708

return e

988

989

709

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

990

# Add property tags

991

710

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

992

711

for name, prop

993

in self._get_all_dbus_things("property")

712

in self._get_all_dbus_properties()

994

713

if prop._dbus_interface

995

714

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

996

715

if_tag.appendChild(tag)

997

# Add annotation tags

998

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

999

for tag in if_tag.getElementsByTagName(typ):

1000

annots = dict()

1001

for name, prop in (self.

1002

_get_all_dbus_things(typ)):

1003

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

1004

and prop._dbus_interface

1005

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

1006

annots.update(getattr(

1007

prop, "_dbus_annotations", {}))

1008

for name, value in annots.items():

1009

ann_tag = document.createElement(

1010

"annotation")

1011

ann_tag.setAttribute("name", name)

1012

ann_tag.setAttribute("value", value)

1013

tag.appendChild(ann_tag)

1014

# Add interface annotation tags

1015

for annotation, value in dict(

1016

itertools.chain.from_iterable(

1017

annotations().items()

1018

for name, annotations

1019

in self._get_all_dbus_things("interface")

1020

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

1021

)).items():

1022

ann_tag = document.createElement("annotation")

1023

ann_tag.setAttribute("name", annotation)

1024

ann_tag.setAttribute("value", value)

1025

if_tag.appendChild(ann_tag)

1026

716

# Add the names to the return values for the

1027

717

# "org.freedesktop.DBus.Properties" methods

1028

718

if (if_tag.getAttribute("name")

1043

733

except (AttributeError, xml.dom.DOMException,

1044

734

xml.parsers.expat.ExpatError) as error:

1045

735

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

1046

exc_info=error)

736

error)

1047

737

return xmlstring

1048

738

1049

739

1050

def datetime_to_dbus(dt, variant_level=0):

1051

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

1052

if dt is None:

1053

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

1054

return dbus.String(dt.isoformat(), variant_level=variant_level)

1055

1056

1057

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1058

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

1059

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

1060

interface names according to the "alt_interface_names" mapping.

1061

Usage:

1062

1063

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

1064

"net.example.AlternateInterface"})

1065

class SampleDBusObject(dbus.service.Object):

1066

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

1067

def SampleDBusMethod():

1068

pass

1069

1070

The above "SampleDBusMethod" on "SampleDBusObject" will be

1071

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

1072

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

1073

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

1074

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

1075

1076

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

1077

(from DBusObjectWithProperties) and interfaces (from the

1078

dbus_interface_annotations decorator).

1079

"""

1080

1081

def wrapper(cls):

1082

for orig_interface_name, alt_interface_name in (

1083

alt_interface_names.items()):

1084

attr = {}

1085

interface_names = set()

1086

# Go though all attributes of the class

1087

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

1088

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

1089

# with the wrong interface name

1090

if (not hasattr(attribute, "_dbus_interface")

1091

or not attribute._dbus_interface.startswith(

1092

orig_interface_name)):

1093

continue

1094

# Create an alternate D-Bus interface name based on

1095

# the current name

1096

alt_interface = attribute._dbus_interface.replace(

1097

orig_interface_name, alt_interface_name)

1098

interface_names.add(alt_interface)

1099

# Is this a D-Bus signal?

1100

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

1101

# Extract the original non-method undecorated

1102

# function by black magic

1103

nonmethod_func = (dict(

1104

zip(attribute.func_code.co_freevars,

1105

attribute.__closure__))

1106

["func"].cell_contents)

1107

# Create a new, but exactly alike, function

1108

# object, and decorate it to be a new D-Bus signal

1109

# with the alternate D-Bus interface name

1110

new_function = (dbus.service.signal(

1111

alt_interface, attribute._dbus_signature)

1112

(types.FunctionType(

1113

nonmethod_func.func_code,

1114

nonmethod_func.func_globals,

1115

nonmethod_func.func_name,

1116

nonmethod_func.func_defaults,

1117

nonmethod_func.func_closure)))

1118

# Copy annotations, if any

1119

try:

1120

new_function._dbus_annotations = dict(

1121

attribute._dbus_annotations)

1122

except AttributeError:

1123

pass

1124

# Define a creator of a function to call both the

1125

# original and alternate functions, so both the

1126

# original and alternate signals gets sent when

1127

# the function is called

1128

def fixscope(func1, func2):

1129

"""This function is a scope container to pass

1130

func1 and func2 to the "call_both" function

1131

outside of its arguments"""

1132

1133

def call_both(*args, **kwargs):

1134

"""This function will emit two D-Bus

1135

signals by calling func1 and func2"""

1136

func1(*args, **kwargs)

1137

func2(*args, **kwargs)

1138

1139

return call_both

1140

# Create the "call_both" function and add it to

1141

# the class

1142

attr[attrname] = fixscope(attribute, new_function)

1143

# Is this a D-Bus method?

1144

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

1145

# Create a new, but exactly alike, function

1146

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

1147

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

1148

# to the class.

1149

attr[attrname] = (

1150

dbus.service.method(

1151

alt_interface,

1152

attribute._dbus_in_signature,

1153

attribute._dbus_out_signature)

1154

(types.FunctionType(attribute.func_code,

1155

attribute.func_globals,

1156

attribute.func_name,

1157

attribute.func_defaults,

1158

attribute.func_closure)))

1159

# Copy annotations, if any

1160

try:

1161

attr[attrname]._dbus_annotations = dict(

1162

attribute._dbus_annotations)

1163

except AttributeError:

1164

pass

1165

# Is this a D-Bus property?

1166

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

1167

# Create a new, but exactly alike, function

1168

# object, and decorate it to be a new D-Bus

1169

# property with the alternate D-Bus interface

1170

# name. Add it to the class.

1171

attr[attrname] = (dbus_service_property(

1172

alt_interface, attribute._dbus_signature,

1173

attribute._dbus_access,

1174

attribute._dbus_get_args_options

1175

["byte_arrays"])

1176

(types.FunctionType(

1177

attribute.func_code,

1178

attribute.func_globals,

1179

attribute.func_name,

1180

attribute.func_defaults,

1181

attribute.func_closure)))

1182

# Copy annotations, if any

1183

try:

1184

attr[attrname]._dbus_annotations = dict(

1185

attribute._dbus_annotations)

1186

except AttributeError:

1187

pass

1188

# Is this a D-Bus interface?

1189

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

1190

# Create a new, but exactly alike, function

1191

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

1192

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

1193

# to the class.

1194

attr[attrname] = (

1195

dbus_interface_annotations(alt_interface)

1196

(types.FunctionType(attribute.func_code,

1197

attribute.func_globals,

1198

attribute.func_name,

1199

attribute.func_defaults,

1200

attribute.func_closure)))

1201

if deprecate:

1202

# Deprecate all alternate interfaces

1203

iname="_AlternateDBusNames_interface_annotation{}"

1204

for interface_name in interface_names:

1205

1206

@dbus_interface_annotations(interface_name)

1207

def func(self):

1208

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

1209

"true" }

1210

# Find an unused name

1211

for aname in (iname.format(i)

1212

for i in itertools.count()):

1213

if aname not in attr:

1214

attr[aname] = func

1215

break

1216

if interface_names:

1217

# Replace the class with a new subclass of it with

1218

# methods, signals, etc. as created above.

1219

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

1220

(cls, ), attr)

1221

return cls

1222

1223

return wrapper

1224

1225

1226

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

1227

"se.bsnet.fukt.Mandos"})

1228

740

class ClientDBus(Client, DBusObjectWithProperties):

1229

741

"""A Client class using D-Bus

1230

742

1234

746

"""

1235

747

1236

748

runtime_expansions = (Client.runtime_expansions

1237

+ ("dbus_object_path", ))

1238

1239

_interface = "se.recompile.Mandos.Client"

749

+ ("dbus_object_path",))

1240

750

1241

751

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

1242

752

1243

753

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

754

self._approvals_pending = 0

1244

755

self.bus = bus

1245

756

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

1246

757

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

1247

758

# the D-Bus

1248

client_object_name = str(self.name).translate(

759

client_object_name = unicode(self.name).translate(

1249

760

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

1250

761

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

1251

self.dbus_object_path = dbus.ObjectPath(

1252

"/clients/" + client_object_name)

762

self.dbus_object_path = (dbus.ObjectPath

763

("/clients/" + client_object_name))

1253

764

DBusObjectWithProperties.__init__(self, self.bus,

1254

765

self.dbus_object_path)

1255

1256

def notifychangeproperty(transform_func, dbus_name,

1257

type_func=lambda x: x,

1258

variant_level=1,

1259

invalidate_only=False,

1260

_interface=_interface):

1261

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

1262

its changes to DBus.

1263

1264

transform_fun: Function that takes a value and a variant_level

1265

and transforms it to a D-Bus type.

1266

dbus_name: D-Bus name of the variable

1267

type_func: Function that transform the value before sending it

1268

to the D-Bus. Default: no transform

1269

variant_level: D-Bus variant level. Default: 1

1270

"""

1271

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

1272

1273

def setter(self, value):

1274

if hasattr(self, "dbus_object_path"):

1275

if (not hasattr(self, attrname) or

1276

type_func(getattr(self, attrname, None))

1277

!= type_func(value)):

1278

if invalidate_only:

1279

self.PropertiesChanged(

1280

_interface, dbus.Dictionary(),

1281

dbus.Array((dbus_name, )))

1282

else:

1283

dbus_value = transform_func(

1284

type_func(value),

1285

variant_level = variant_level)

1286

self.PropertyChanged(dbus.String(dbus_name),

1287

dbus_value)

1288

self.PropertiesChanged(

1289

_interface,

1290

dbus.Dictionary({ dbus.String(dbus_name):

1291

dbus_value }),

1292

dbus.Array())

1293

setattr(self, attrname, value)

1294

1295

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

1296

1297

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1298

approvals_pending = notifychangeproperty(dbus.Boolean,

1299

"ApprovalPending",

1300

type_func = bool)

1301

enabled = notifychangeproperty(dbus.Boolean, "Enabled")

1302

last_enabled = notifychangeproperty(datetime_to_dbus,

1303

"LastEnabled")

1304

checker = notifychangeproperty(

1305

dbus.Boolean, "CheckerRunning",

1306

type_func = lambda checker: checker is not None)

1307

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1308

"LastCheckedOK")

1309

last_checker_status = notifychangeproperty(dbus.Int16,

1310

"LastCheckerStatus")

1311

last_approval_request = notifychangeproperty(

1312

datetime_to_dbus, "LastApprovalRequest")

1313

approved_by_default = notifychangeproperty(dbus.Boolean,

1314

"ApprovedByDefault")

1315

approval_delay = notifychangeproperty(

1316

dbus.UInt64, "ApprovalDelay",

1317

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

1318

approval_duration = notifychangeproperty(

1319

dbus.UInt64, "ApprovalDuration",

1320

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

1321

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

1322

timeout = notifychangeproperty(

1323

dbus.UInt64, "Timeout",

1324

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

1325

extended_timeout = notifychangeproperty(

1326

dbus.UInt64, "ExtendedTimeout",

1327

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

1328

interval = notifychangeproperty(

1329

dbus.UInt64, "Interval",

1330

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

1331

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

1332

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

1333

invalidate_only=True)

1334

1335

del notifychangeproperty

766

767

def _get_approvals_pending(self):

768

return self._approvals_pending

769

def _set_approvals_pending(self, value):

770

old_value = self._approvals_pending

771

self._approvals_pending = value

772

bval = bool(value)

773

if (hasattr(self, "dbus_object_path")

774

and bval is not bool(old_value)):

775

dbus_bool = dbus.Boolean(bval, variant_level=1)

776

self.PropertyChanged(dbus.String("ApprovalPending"),

777

dbus_bool)

778

779

approvals_pending = property(_get_approvals_pending,

780

_set_approvals_pending)

781

del _get_approvals_pending, _set_approvals_pending

782

783

@staticmethod

784

def _datetime_to_dbus(dt, variant_level=0):

785

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

786

return dbus.String(dt.isoformat(),

787

variant_level=variant_level)

788

789

def enable(self):

790

oldstate = getattr(self, "enabled", False)

791

r = Client.enable(self)

792

if oldstate != self.enabled:

793

# Emit D-Bus signals

794

self.PropertyChanged(dbus.String("Enabled"),

795

dbus.Boolean(True, variant_level=1))

796

self.PropertyChanged(

797

dbus.String("LastEnabled"),

798

self._datetime_to_dbus(self.last_enabled,

799

variant_level=1))

800

return r

801

802

def disable(self, quiet = False):

803

oldstate = getattr(self, "enabled", False)

804

r = Client.disable(self, quiet=quiet)

805

if not quiet and oldstate != self.enabled:

806

# Emit D-Bus signal

807

self.PropertyChanged(dbus.String("Enabled"),

808

dbus.Boolean(False, variant_level=1))

809

return r

1336

810

1337

811

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

1338

812

try:

1347

821

*args, **kwargs):

1348

822

self.checker_callback_tag = None

1349

823

self.checker = None

824

# Emit D-Bus signal

825

self.PropertyChanged(dbus.String("CheckerRunning"),

826

dbus.Boolean(False, variant_level=1))

1350

827

if os.WIFEXITED(condition):

1351

828

exitstatus = os.WEXITSTATUS(condition)

1352

829

# Emit D-Bus signal

1362

839

return Client.checker_callback(self, pid, condition, command,

1363

840

*args, **kwargs)

1364

841

842

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

843

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

844

# Emit D-Bus signal

845

self.PropertyChanged(

846

dbus.String("LastCheckedOK"),

847

(self._datetime_to_dbus(self.last_checked_ok,

848

variant_level=1)))

849

850

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

851

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

852

# Emit D-Bus signal

853

self.PropertyChanged(

854

dbus.String("LastApprovalRequest"),

855

(self._datetime_to_dbus(self.last_approval_request,

856

variant_level=1)))

857

return r

858

1365

859

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

1366

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

860

old_checker = self.checker

861

if self.checker is not None:

862

old_checker_pid = self.checker.pid

863

else:

864

old_checker_pid = None

1367

865

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

1368

866

# Only if new checker process was started

1369

867

if (self.checker is not None

1370

868

and old_checker_pid != self.checker.pid):

1371

869

# Emit D-Bus signal

1372

870

self.CheckerStarted(self.current_checker_command)

871

self.PropertyChanged(

872

dbus.String("CheckerRunning"),

873

dbus.Boolean(True, variant_level=1))

1373

874

return r

1374

875

876

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

877

old_checker = getattr(self, "checker", None)

878

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

879

if (old_checker is not None

880

and getattr(self, "checker", None) is None):

881

self.PropertyChanged(dbus.String("CheckerRunning"),

882

dbus.Boolean(False, variant_level=1))

883

return r

884

1375

885

def _reset_approved(self):

1376

self.approved = None

886

self._approved = None

1377

887

return False

1378

888

1379

889

def approve(self, value=True):

1380

self.approved = value

1381

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

1382

* 1000), self._reset_approved)

1383

890

self.send_changedstate()

891

self._approved = value

892

gobject.timeout_add(self._timedelta_to_milliseconds

893

(self.approval_duration),

894

self._reset_approved)

895

1384

896

1385

897

## D-Bus methods, signals & properties

1386

1387

## Interfaces

898

_interface = "se.bsnet.fukt.Mandos.Client"

1388

899

1389

900

## Signals

1390

901

1401

912

pass

1402

913

1403

914

# PropertyChanged - signal

1404

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

1405

915

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

1406

916

def PropertyChanged(self, property, value):

1407

917

"D-Bus signal"

1471

981

return dbus.Boolean(bool(self.approvals_pending))

1472

982

1473

983

# ApprovedByDefault - property

1474

@dbus_service_property(_interface,

1475

signature="b",

984

@dbus_service_property(_interface, signature="b",

1476

985

access="readwrite")

1477

986

def ApprovedByDefault_dbus_property(self, value=None):

1478

987

if value is None: # get

1479

988

return dbus.Boolean(self.approved_by_default)

1480

989

self.approved_by_default = bool(value)

990

# Emit D-Bus signal

991

self.PropertyChanged(dbus.String("ApprovedByDefault"),

992

dbus.Boolean(value, variant_level=1))

1481

993

1482

994

# ApprovalDelay - property

1483

@dbus_service_property(_interface,

1484

signature="t",

995

@dbus_service_property(_interface, signature="t",

1485

996

access="readwrite")

1486

997

def ApprovalDelay_dbus_property(self, value=None):

1487

998

if value is None: # get

1488

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

1489

* 1000)

999

return dbus.UInt64(self.approval_delay_milliseconds())

1490

1000

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

1001

# Emit D-Bus signal

1002

self.PropertyChanged(dbus.String("ApprovalDelay"),

1003

dbus.UInt64(value, variant_level=1))

1491

1004

1492

1005

# ApprovalDuration - property

1493

@dbus_service_property(_interface,

1494

signature="t",

1006

@dbus_service_property(_interface, signature="t",

1495

1007

access="readwrite")

1496

1008

def ApprovalDuration_dbus_property(self, value=None):

1497

1009

if value is None: # get

1498

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

1499

* 1000)

1010

return dbus.UInt64(self._timedelta_to_milliseconds(

1011

self.approval_duration))

1500

1012

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

1013

# Emit D-Bus signal

1014

self.PropertyChanged(dbus.String("ApprovalDuration"),

1015

dbus.UInt64(value, variant_level=1))

1501

1016

1502

1017

# Name - property

1503

1018

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

1510

1025

return dbus.String(self.fingerprint)

1511

1026

1512

1027

# Host - property

1513

@dbus_service_property(_interface,

1514

signature="s",

1028

@dbus_service_property(_interface, signature="s",

1515

1029

access="readwrite")

1516

1030

def Host_dbus_property(self, value=None):

1517

1031

if value is None: # get

1518

1032

return dbus.String(self.host)

1519

self.host = str(value)

1033

self.host = value

1034

# Emit D-Bus signal

1035

self.PropertyChanged(dbus.String("Host"),

1036

dbus.String(value, variant_level=1))

1520

1037

1521

1038

# Created - property

1522

1039

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

1523

1040

def Created_dbus_property(self):

1524

return datetime_to_dbus(self.created)

1041

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

1525

1042

1526

1043

# LastEnabled - property

1527

1044

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

1528

1045

def LastEnabled_dbus_property(self):

1529

return datetime_to_dbus(self.last_enabled)

1046

if self.last_enabled is None:

1047

return dbus.String("")

1048

return dbus.String(self._datetime_to_dbus(self.last_enabled))

1530

1049

1531

1050

# Enabled - property

1532

@dbus_service_property(_interface,

1533

signature="b",

1051

@dbus_service_property(_interface, signature="b",

1534

1052

access="readwrite")

1535

1053

def Enabled_dbus_property(self, value=None):

1536

1054

if value is None: # get

1541

1059

self.disable()

1542

1060

1543

1061

# LastCheckedOK - property

1544

@dbus_service_property(_interface,

1545

signature="s",

1062

@dbus_service_property(_interface, signature="s",

1546

1063

access="readwrite")

1547

1064

def LastCheckedOK_dbus_property(self, value=None):

1548

1065

if value is not None:

1549

1066

self.checked_ok()

1550

1067

return

1551

return datetime_to_dbus(self.last_checked_ok)

1552

1553

# LastCheckerStatus - property

1554

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

1555

def LastCheckerStatus_dbus_property(self):

1556

return dbus.Int16(self.last_checker_status)

1557

1558

# Expires - property

1559

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

1560

def Expires_dbus_property(self):

1561

return datetime_to_dbus(self.expires)

1068

if self.last_checked_ok is None:

1069

return dbus.String("")

1070

return dbus.String(self._datetime_to_dbus(self

1071

.last_checked_ok))

1562

1072

1563

1073

# LastApprovalRequest - property

1564

1074

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

1565

1075

def LastApprovalRequest_dbus_property(self):

1566

return datetime_to_dbus(self.last_approval_request)

1076

if self.last_approval_request is None:

1077

return dbus.String("")

1078

return dbus.String(self.

1079

_datetime_to_dbus(self

1080

.last_approval_request))

1567

1081

1568

1082

# Timeout - property

1569

@dbus_service_property(_interface,

1570

signature="t",

1083

@dbus_service_property(_interface, signature="t",

1571

1084

access="readwrite")

1572

1085

def Timeout_dbus_property(self, value=None):

1573

1086

if value is None: # get

1574

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

1575

old_timeout = self.timeout

1087

return dbus.UInt64(self.timeout_milliseconds())

1576

1088

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

1577

# Reschedule disabling

1578

if self.enabled:

1579

now = datetime.datetime.utcnow()

1580

self.expires += self.timeout - old_timeout

1581

if self.expires <= now:

1582

# The timeout has passed

1583

self.disable()

1584

else:

1585

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

1586

is None):

1587

return

1588

gobject.source_remove(self.disable_initiator_tag)

1589

self.disable_initiator_tag = gobject.timeout_add(

1590

int((self.expires - now).total_seconds() * 1000),

1591

self.disable)

1592

1593

# ExtendedTimeout - property

1594

@dbus_service_property(_interface,

1595

signature="t",

1596

access="readwrite")

1597

def ExtendedTimeout_dbus_property(self, value=None):

1598

if value is None: # get

1599

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

1600

* 1000)

1601

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

1089

# Emit D-Bus signal

1090

self.PropertyChanged(dbus.String("Timeout"),

1091

dbus.UInt64(value, variant_level=1))

1092

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

1093

return

1094

# Reschedule timeout

1095

gobject.source_remove(self.disable_initiator_tag)

1096

self.disable_initiator_tag = None

1097

time_to_die = (self.

1098

_timedelta_to_milliseconds((self

1099

.last_checked_ok

1100

+ self.timeout)

1101

- datetime.datetime

1102

.utcnow()))

1103

if time_to_die <= 0:

1104

# The timeout has passed

1105

self.disable()

1106

else:

1107

self.disable_initiator_tag = (gobject.timeout_add

1108

(time_to_die, self.disable))

1602

1109

1603

1110

# Interval - property

1604

@dbus_service_property(_interface,

1605

signature="t",

1111

@dbus_service_property(_interface, signature="t",

1606

1112

access="readwrite")

1607

1113

def Interval_dbus_property(self, value=None):

1608

1114

if value is None: # get

1609

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

1115

return dbus.UInt64(self.interval_milliseconds())

1610

1116

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

1117

# Emit D-Bus signal

1118

self.PropertyChanged(dbus.String("Interval"),

1119

dbus.UInt64(value, variant_level=1))

1611

1120

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

1612

1121

return

1613

if self.enabled:

1614

# Reschedule checker run

1615

gobject.source_remove(self.checker_initiator_tag)

1616

self.checker_initiator_tag = gobject.timeout_add(

1617

value, self.start_checker)

1618

self.start_checker() # Start one now, too

1619

1122

# Reschedule checker run

1123

gobject.source_remove(self.checker_initiator_tag)

1124

self.checker_initiator_tag = (gobject.timeout_add

1125

(value, self.start_checker))

1126

self.start_checker() # Start one now, too

1127

1620

1128

# Checker - property

1621

@dbus_service_property(_interface,

1622

signature="s",

1129

@dbus_service_property(_interface, signature="s",

1623

1130

access="readwrite")

1624

1131

def Checker_dbus_property(self, value=None):

1625

1132

if value is None: # get

1626

1133

return dbus.String(self.checker_command)

1627

self.checker_command = str(value)

1134

self.checker_command = value

1135

# Emit D-Bus signal

1136

self.PropertyChanged(dbus.String("Checker"),

1137

dbus.String(self.checker_command,

1138

variant_level=1))

1628

1139

1629

1140

# CheckerRunning - property

1630

@dbus_service_property(_interface,

1631

signature="b",

1141

@dbus_service_property(_interface, signature="b",

1632

1142

access="readwrite")

1633

1143

def CheckerRunning_dbus_property(self, value=None):

1634

1144

if value is None: # get

1644

1154

return self.dbus_object_path # is already a dbus.ObjectPath

1645

1155

1646

1156

# Secret = property

1647

@dbus_service_property(_interface,

1648

signature="ay",

1649

access="write",

1650

byte_arrays=True)

1157

@dbus_service_property(_interface, signature="ay",

1158

access="write", byte_arrays=True)

1651

1159

def Secret_dbus_property(self, value):

1652

self.secret = bytes(value)

1160

self.secret = str(value)

1653

1161

1654

1162

del _interface

1655

1163

1660

1168

self._pipe.send(('init', fpr, address))

1661

1169

if not self._pipe.recv():

1662

1170

raise KeyError()

1663

1171

1664

1172

def __getattribute__(self, name):

1665

if name == '_pipe':

1173

if(name == '_pipe'):

1666

1174

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

1667

1175

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

1668

1176

data = self._pipe.recv()

1669

1177

if data[0] == 'data':

1670

1178

return data[1]

1671

1179

if data[0] == 'function':

1672

1673

1180

def func(*args, **kwargs):

1674

1181

self._pipe.send(('funcall', name, args, kwargs))

1675

1182

return self._pipe.recv()[1]

1676

1677

1183

return func

1678

1184

1679

1185

def __setattr__(self, name, value):

1680

if name == '_pipe':

1186

if(name == '_pipe'):

1681

1187

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

1682

1188

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

1683

1189

1691

1197

def handle(self):

1692

1198

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

1693

1199

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

1694

str(self.client_address))

1200

unicode(self.client_address))

1695

1201

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

1696

1202

self.server.child_pipe.fileno())

1697

1698

session = gnutls.connection.ClientSession(

1699

self.request, gnutls.connection .X509Credentials())

1700

1203

1204

session = (gnutls.connection

1205

.ClientSession(self.request,

1206

gnutls.connection

1207

.X509Credentials()))

1208

1701

1209

# Note: gnutls.connection.X509Credentials is really a

1702

1210

# generic GnuTLS certificate credentials object so long as

1703

1211

# no X.509 keys are added to it. Therefore, we can use it

1704

1212

# here despite using OpenPGP certificates.

1705

1213

1706

1214

#priority = ':'.join(("NONE", "+VERS-TLS1.1",

1707

1215

# "+AES-256-CBC", "+SHA1",

1708

1216

# "+COMP-NULL", "+CTYPE-OPENPGP",

1711

1219

priority = self.server.gnutls_priority

1712

1220

if priority is None:

1713

1221

priority = "NORMAL"

1714

gnutls.library.functions.gnutls_priority_set_direct(

1715

session._c_object, priority, None)

1716

1222

(gnutls.library.functions

1223

.gnutls_priority_set_direct(session._c_object,

1224

priority, None))

1225

1717

1226

# Start communication using the Mandos protocol

1718

1227

# Get protocol number

1719

1228

line = self.request.makefile().readline()

1720

1229

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

1721

1230

try:

1722

1231

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

1723

raise RuntimeError(line)

1232

raise RuntimeError

1724

1233

except (ValueError, IndexError, RuntimeError) as error:

1725

1234

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

1726

1235

return

1727

1236

1728

1237

# Start GnuTLS connection

1729

1238

try:

1730

1239

session.handshake()

1734

1243

# established. Just abandon the request.

1735

1244

return

1736

1245

logger.debug("Handshake succeeded")

1737

1246

1738

1247

approval_required = False

1739

1248

try:

1740

1249

try:

1741

fpr = self.fingerprint(

1742

self.peer_certificate(session))

1250

fpr = self.fingerprint(self.peer_certificate

1251

(session))

1743

1252

except (TypeError,

1744

1253

gnutls.errors.GNUTLSError) as error:

1745

1254

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

1746

1255

return

1747

1256

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

1748

1257

1749

1258

try:

1750

1259

client = ProxyClient(child_pipe, fpr,

1751

1260

self.client_address)

1760

1269

while True:

1761

1270

if not client.enabled:

1762

1271

logger.info("Client %s is disabled",

1763

client.name)

1272

client.name)

1764

1273

if self.server.use_dbus:

1765

1274

# Emit D-Bus signal

1766

client.Rejected("Disabled")

1275

client.Rejected("Disabled")

1767

1276

return

1768

1277

1769

if client.approved or not client.approval_delay:

1278

if client._approved or not client.approval_delay:

1770

1279

#We are approved or approval is disabled

1771

1280

break

1772

elif client.approved is None:

1281

elif client._approved is None:

1773

1282

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

1774

1283

client.name)

1775

1284

if self.server.use_dbus:

1776

1285

# Emit D-Bus signal

1777

1286

client.NeedApproval(

1778

client.approval_delay.total_seconds()

1779

* 1000, client.approved_by_default)

1287

client.approval_delay_milliseconds(),

1288

client.approved_by_default)

1780

1289

else:

1781

1290

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

1782

1291

client.name)

1786

1295

return

1787

1296

1788

1297

#wait until timeout or approved

1298

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

1789

1299

time = datetime.datetime.now()

1790

1300

client.changedstate.acquire()

1791

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

1301

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

1792

1302

client.changedstate.release()

1793

1303

time2 = datetime.datetime.now()

1794

1304

if (time2 - time) >= delay:

1810

1320

try:

1811

1321

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

1812

1322

except gnutls.errors.GNUTLSError as error:

1813

logger.warning("gnutls send failed",

1814

exc_info=error)

1323

logger.warning("gnutls send failed")

1815

1324

return

1816

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

1817

len(client.secret) - (sent_size

1818

+ sent))

1325

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

1326

sent, len(client.secret)

1327

- (sent_size + sent))

1819

1328

sent_size += sent

1820

1329

1821

1330

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

1822

# bump the timeout using extended_timeout

1823

client.bump_timeout(client.extended_timeout)

1331

# bump the timeout as if seen

1332

client.checked_ok()

1824

1333

if self.server.use_dbus:

1825

1334

# Emit D-Bus signal

1826

1335

client.GotSecret()

1831

1340

try:

1832

1341

session.bye()

1833

1342

except gnutls.errors.GNUTLSError as error:

1834

logger.warning("GnuTLS bye failed",

1835

exc_info=error)

1343

logger.warning("GnuTLS bye failed")

1836

1344

1837

1345

@staticmethod

1838

1346

def peer_certificate(session):

1839

1347

"Return the peer's OpenPGP certificate as a bytestring"

1840

1348

# If not an OpenPGP certificate...

1841

if (gnutls.library.functions.gnutls_certificate_type_get(

1842

session._c_object)

1349

if (gnutls.library.functions

1350

.gnutls_certificate_type_get(session._c_object)

1843

1351

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1844

1352

# ...do the normal thing

1845

1353

return session.peer_certificate

1859

1367

def fingerprint(openpgp):

1860

1368

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1861

1369

# New GnuTLS "datum" with the OpenPGP public key

1862

datum = gnutls.library.types.gnutls_datum_t(

1863

ctypes.cast(ctypes.c_char_p(openpgp),

1864

ctypes.POINTER(ctypes.c_ubyte)),

1865

ctypes.c_uint(len(openpgp)))

1370

datum = (gnutls.library.types

1371

.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),

1372

ctypes.POINTER

1373

(ctypes.c_ubyte)),

1374

ctypes.c_uint(len(openpgp))))

1866

1375

# New empty GnuTLS certificate

1867

1376

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1868

gnutls.library.functions.gnutls_openpgp_crt_init(

1869

ctypes.byref(crt))

1377

(gnutls.library.functions

1378

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

1870

1379

# Import the OpenPGP public key into the certificate

1871

gnutls.library.functions.gnutls_openpgp_crt_import(

1872

crt, ctypes.byref(datum),

1873

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

1380

(gnutls.library.functions

1381

.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),

1382

gnutls.library.constants

1383

.GNUTLS_OPENPGP_FMT_RAW))

1874

1384

# Verify the self signature in the key

1875

1385

crtverify = ctypes.c_uint()

1876

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1877

crt, 0, ctypes.byref(crtverify))

1386

(gnutls.library.functions

1387

.gnutls_openpgp_crt_verify_self(crt, 0,

1388

ctypes.byref(crtverify)))

1878

1389

if crtverify.value != 0:

1879

1390

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1880

raise gnutls.errors.CertificateSecurityError(

1881

"Verify failed")

1391

raise (gnutls.errors.CertificateSecurityError

1392

("Verify failed"))

1882

1393

# New buffer for the fingerprint

1883

1394

buf = ctypes.create_string_buffer(20)

1884

1395

buf_len = ctypes.c_size_t()

1885

1396

# Get the fingerprint from the certificate into the buffer

1886

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1887

crt, ctypes.byref(buf), ctypes.byref(buf_len))

1397

(gnutls.library.functions

1398

.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),

1399

ctypes.byref(buf_len)))

1888

1400

# Deinit the certificate

1889

1401

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1890

1402

# Convert the buffer to a Python bytestring

1891

1403

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

1892

1404

# Convert the bytestring to hexadecimal notation

1893

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

1405

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

1894

1406

return hex_fpr

1895

1407

1896

1408

1897

1409

class MultiprocessingMixIn(object):

1898

1410

"""Like socketserver.ThreadingMixIn, but with multiprocessing"""

1899

1900

1411

def sub_process_main(self, request, address):

1901

1412

try:

1902

1413

self.finish_request(request, address)

1903

except Exception:

1414

except:

1904

1415

self.handle_error(request, address)

1905

1416

self.close_request(request)

1906

1417

1907

1418

def process_request(self, request, address):

1908

1419

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

1909

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

1910

args = (request, address))

1911

proc.start()

1912

return proc

1913

1420

multiprocessing.Process(target = self.sub_process_main,

1421

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

1914

1422

1915

1423

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1916

1424

""" adds a pipe to the MixIn """

1917

1918

1425

def process_request(self, request, client_address):

1919

1426

"""Overrides and wraps the original process_request().

1920

1427

1921

1428

This function creates a new pipe in self.pipe

1922

1429

"""

1923

1430

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1924

1925

proc = MultiprocessingMixIn.process_request(self, request,

1926

client_address)

1431

1432

super(MultiprocessingMixInWithPipe,

1433

self).process_request(request, client_address)

1927

1434

self.child_pipe.close()

1928

self.add_pipe(parent_pipe, proc)

1929

1930

def add_pipe(self, parent_pipe, proc):

1435

self.add_pipe(parent_pipe)

1436

1437

def add_pipe(self, parent_pipe):

1931

1438

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

1932

raise NotImplementedError()

1933

1439

raise NotImplementedError

1934

1440

1935

1441

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1936

1442

socketserver.TCPServer, object):

1941

1447

interface: None or a network interface name (string)

1942

1448

use_ipv6: Boolean; to use IPv6 or not

1943

1449

"""

1944

1945

1450

def __init__(self, server_address, RequestHandlerClass,

1946

interface=None,

1947

use_ipv6=True,

1948

socketfd=None):

1949

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

1950

creating a new one with socket.socket().

1951

"""

1451

interface=None, use_ipv6=True):

1952

1452

self.interface = interface

1953

1453

if use_ipv6:

1954

1454

self.address_family = socket.AF_INET6

1955

if socketfd is not None:

1956

# Save the file descriptor

1957

self.socketfd = socketfd

1958

# Save the original socket.socket() function

1959

self.socket_socket = socket.socket

1960

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

1961

#

1962

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

1963

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

1964

# patching socket.socket.)

1965

#

1966

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

1967

@functools.wraps(socket.socket)

1968

def socket_wrapper(*args, **kwargs):

1969

# Restore original function so subsequent calls are

1970

# not affected.

1971

socket.socket = self.socket_socket

1972

del self.socket_socket

1973

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

1974

# saved file descriptor.

1975

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

1976

# Replace socket.socket() function with wrapper

1977

socket.socket = socket_wrapper

1978

# The socketserver.TCPServer.__init__ will call

1979

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

1980

# socket_wrapper(), if socketfd was set.

1981

1455

socketserver.TCPServer.__init__(self, server_address,

1982

1456

RequestHandlerClass)

1983

1984

1457

def server_bind(self):

1985

1458

"""This overrides the normal server_bind() function

1986

1459

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

1992

1465

self.interface)

1993

1466

else:

1994

1467

try:

1995

self.socket.setsockopt(

1996

socket.SOL_SOCKET, SO_BINDTODEVICE,

1997

(self.interface + "\0").encode("utf-8"))

1468

self.socket.setsockopt(socket.SOL_SOCKET,

1469

SO_BINDTODEVICE,

1470

str(self.interface

1471

+ '\0'))

1998

1472

except socket.error as error:

1999

if error.errno == errno.EPERM:

2000

logger.error("No permission to bind to"

2001

" interface %s", self.interface)

2002

elif error.errno == errno.ENOPROTOOPT:

1473

if error[0] == errno.EPERM:

1474

logger.error("No permission to"

1475

" bind to interface %s",

1476

self.interface)

1477

elif error[0] == errno.ENOPROTOOPT:

2003

1478

logger.error("SO_BINDTODEVICE not available;"

2004

1479

" cannot bind to interface %s",

2005

1480

self.interface)

2006

elif error.errno == errno.ENODEV:

2007

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

2008

" cannot bind", self.interface)

2009

1481

else:

2010

1482

raise

2011

1483

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

2014

1486

if self.address_family == socket.AF_INET6:

2015

1487

any_address = "::" # in6addr_any

2016

1488

else:

2017

any_address = "0.0.0.0" # INADDR_ANY

1489

any_address = socket.INADDR_ANY

2018

1490

self.server_address = (any_address,

2019

1491

self.server_address[1])

2020

1492

elif not self.server_address[1]:

2021

self.server_address = (self.server_address[0], 0)

1493

self.server_address = (self.server_address[0],

1494

0)

2022

1495

# if self.interface:

2023

1496

# self.server_address = (self.server_address[0],

2024

1497

# 0, # port

2038

1511

2039

1512

Assumes a gobject.MainLoop event loop.

2040

1513

"""

2041

2042

1514

def __init__(self, server_address, RequestHandlerClass,

2043

interface=None,

2044

use_ipv6=True,

2045

clients=None,

2046

gnutls_priority=None,

2047

use_dbus=True,

2048

socketfd=None):

1515

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

1516

gnutls_priority=None, use_dbus=True):

2049

1517

self.enabled = False

2050

1518

self.clients = clients

2051

1519

if self.clients is None:

2052

self.clients = {}

1520

self.clients = set()

2053

1521

self.use_dbus = use_dbus

2054

1522

self.gnutls_priority = gnutls_priority

2055

1523

IPv6_TCPServer.__init__(self, server_address,

2056

1524

RequestHandlerClass,

2057

1525

interface = interface,

2058

use_ipv6 = use_ipv6,

2059

socketfd = socketfd)

2060

1526

use_ipv6 = use_ipv6)

2061

1527

def server_activate(self):

2062

1528

if self.enabled:

2063

1529

return socketserver.TCPServer.server_activate(self)

2064

2065

1530

def enable(self):

2066

1531

self.enabled = True

2067

2068

def add_pipe(self, parent_pipe, proc):

1532

def add_pipe(self, parent_pipe):

2069

1533

# Call "handle_ipc" for both data and EOF events

2070

gobject.io_add_watch(

2071

parent_pipe.fileno(),

2072

gobject.IO_IN | gobject.IO_HUP,

2073

functools.partial(self.handle_ipc,

2074

parent_pipe = parent_pipe,

2075

proc = proc))

2076

2077

def handle_ipc(self, source, condition,

2078

parent_pipe=None,

2079

proc = None,

1534

gobject.io_add_watch(parent_pipe.fileno(),

1535

gobject.IO_IN | gobject.IO_HUP,

1536

functools.partial(self.handle_ipc,

1537

parent_pipe = parent_pipe))

1538

1539

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

2080

1540

client_object=None):

2081

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

2082

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

2083

# Wait for other process to exit

2084

proc.join()

1541

condition_names = {

1542

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

1543

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

1544

# blocking).

1545

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

1546

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

1547

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

1548

# broken, usually for pipes and

1549

# sockets).

1550

}

1551

conditions_string = ' | '.join(name

1552

for cond, name in

1553

condition_names.iteritems()

1554

if cond & condition)

1555

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

1556

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

2085

1557

return False

2086

1558

2087

1559

# Read a request from the child

2092

1564

fpr = request[1]

2093

1565

address = request[2]

2094

1566

2095

for c in self.clients.itervalues():

1567

for c in self.clients:

2096

1568

if c.fingerprint == fpr:

2097

1569

client = c

2098

1570

break

2101

1573

"dress: %s", fpr, address)

2102

1574

if self.use_dbus:

2103

1575

# Emit D-Bus signal

2104

mandos_dbus_service.ClientNotFound(fpr,

2105

address[0])

1576

mandos_dbus_service.ClientNotFound(fpr, address[0])

2106

1577

parent_pipe.send(False)

2107

1578

return False

2108

1579

2109

gobject.io_add_watch(

2110

parent_pipe.fileno(),

2111

gobject.IO_IN | gobject.IO_HUP,

2112

functools.partial(self.handle_ipc,

2113

parent_pipe = parent_pipe,

2114

proc = proc,

2115

client_object = client))

1580

gobject.io_add_watch(parent_pipe.fileno(),

1581

gobject.IO_IN | gobject.IO_HUP,

1582

functools.partial(self.handle_ipc,

1583

parent_pipe = parent_pipe,

1584

client_object = client))

2116

1585

parent_pipe.send(True)

2117

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

2118

# same fileno

1586

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

2119

1587

return False

2120

1588

if command == 'funcall':

2121

1589

funcname = request[1]

2122

1590

args = request[2]

2123

1591

kwargs = request[3]

2124

1592

2125

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

2126

funcname)(*args,

2127

**kwargs)))

2128

1593

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

1594

2129

1595

if command == 'getattr':

2130

1596

attrname = request[1]

2131

1597

if callable(client_object.__getattribute__(attrname)):

2132

parent_pipe.send(('function', ))

1598

parent_pipe.send(('function',))

2133

1599

else:

2134

parent_pipe.send((

2135

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

1600

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

2136

1601

2137

1602

if command == 'setattr':

2138

1603

attrname = request[1]

2139

1604

value = request[2]

2140

1605

setattr(client_object, attrname, value)

2141

1606

2142

1607

return True

2143

1608

2144

1609

2145

def rfc3339_duration_to_delta(duration):

2146

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

2147

2148

>>> rfc3339_duration_to_delta("P7D")

2149

datetime.timedelta(7)

2150

>>> rfc3339_duration_to_delta("PT60S")

2151

datetime.timedelta(0, 60)

2152

>>> rfc3339_duration_to_delta("PT60M")

2153

datetime.timedelta(0, 3600)

2154

>>> rfc3339_duration_to_delta("PT24H")

2155

datetime.timedelta(1)

2156

>>> rfc3339_duration_to_delta("P1W")

2157

datetime.timedelta(7)

2158

>>> rfc3339_duration_to_delta("PT5M30S")

2159

datetime.timedelta(0, 330)

2160

>>> rfc3339_duration_to_delta("P1DT3M20S")

2161

datetime.timedelta(1, 200)

2162

"""

2163

2164

# Parsing an RFC 3339 duration with regular expressions is not

2165

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

2166

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

2167

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

2168

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

2169

# avoid excessive use of external libraries.

2170

2171

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

2172

Token = collections.namedtuple("Token",

2173

("regexp", # To match token; if

2174

# "value" is not None,

2175

# must have a "group"

2176

# containing digits

2177

"value", # datetime.timedelta or

2178

# None

2179

"followers")) # Tokens valid after

2180

# this token

2181

Token = collections.namedtuple("Token", (

2182

"regexp", # To match token; if "value" is not None, must have

2183

# a "group" containing digits

2184

"value", # datetime.timedelta or None

2185

"followers")) # Tokens valid after this token

2186

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

2187

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

2188

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

2189

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

2190

datetime.timedelta(seconds=1),

2191

frozenset((token_end, )))

2192

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

2193

datetime.timedelta(minutes=1),

2194

frozenset((token_second, token_end)))

2195

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

2196

datetime.timedelta(hours=1),

2197

frozenset((token_minute, token_end)))

2198

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

2199

None,

2200

frozenset((token_hour, token_minute,

2201

token_second)))

2202

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

2203

datetime.timedelta(days=1),

2204

frozenset((token_time, token_end)))

2205

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

2206

datetime.timedelta(weeks=4),

2207

frozenset((token_day, token_end)))

2208

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

2209

datetime.timedelta(weeks=52),

2210

frozenset((token_month, token_end)))

2211

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

2212

datetime.timedelta(weeks=1),

2213

frozenset((token_end, )))

2214

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

2215

frozenset((token_year, token_month,

2216

token_day, token_time,

2217

token_week)))

2218

# Define starting values

2219

value = datetime.timedelta() # Value so far

2220

found_token = None

2221

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

2222

s = duration # String left to parse

2223

# Loop until end token is found

2224

while found_token is not token_end:

2225

# Search for any currently valid tokens

2226

for token in followers:

2227

match = token.regexp.match(s)

2228

if match is not None:

2229

# Token found

2230

if token.value is not None:

2231

# Value found, parse digits

2232

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

2233

# Add to value so far

2234

value += factor * token.value

2235

# Strip token from string

2236

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

2237

# Go to found token

2238

found_token = token

2239

# Set valid next tokens

2240

followers = found_token.followers

2241

break

2242

else:

2243

# No currently valid tokens were found

2244

raise ValueError("Invalid RFC 3339 duration")

2245

# End token found

2246

return value

2247

2248

2249

1610

def string_to_delta(interval):

2250

1611

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

2251

1612

2262

1623

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

2263

1624

datetime.timedelta(0, 330)

2264

1625

"""

2265

2266

try:

2267

return rfc3339_duration_to_delta(interval)

2268

except ValueError:

2269

pass

2270

2271

1626

timevalue = datetime.timedelta(0)

2272

1627

for s in interval.split():

2273

1628

try:

2274

suffix = s[-1]

1629

suffix = unicode(s[-1])

2275

1630

value = int(s[:-1])

2276

1631

if suffix == "d":

2277

1632

delta = datetime.timedelta(value)

2284

1639

elif suffix == "w":

2285

1640

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

2286

1641

else:

2287

raise ValueError("Unknown suffix {!r}".format(suffix))

2288

except IndexError as e:

1642

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

1643

except (ValueError, IndexError) as e:

2289

1644

raise ValueError(*(e.args))

2290

1645

timevalue += delta

2291

1646

return timevalue

2292

1647

2293

1648

1649

def if_nametoindex(interface):

1650

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

1651

1652

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

1653

global if_nametoindex

1654

try:

1655

if_nametoindex = (ctypes.cdll.LoadLibrary

1656

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

1657

.if_nametoindex)

1658

except (OSError, AttributeError):

1659

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

1660

def if_nametoindex(interface):

1661

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

1662

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

1663

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

1664

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1665

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

1666

interface))

1667

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

1668

ifreq[16:20])[0]

1669

return interface_index

1670

return if_nametoindex(interface)

1671

1672

2294

1673

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

2295

1674

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

2296

1675

2304

1683

sys.exit()

2305

1684

if not noclose:

2306

1685

# Close all standard open file descriptors

2307

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

1686

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

2308

1687

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

2309

1688

raise OSError(errno.ENODEV,

2310

"{} not a character device"

2311

.format(os.devnull))

1689

"%s not a character device"

1690

% os.path.devnull)

2312

1691

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

2313

1692

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

2314

1693

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

2323

1702

2324

1703

parser = argparse.ArgumentParser()

2325

1704

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

2326

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

1705

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

2327

1706

help="show version number and exit")

2328

1707

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

2329

1708

help="Bind to interface IF")

2335

1714

help="Run self-test")

2336

1715

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

2337

1716

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

2338

" to terminal", default=None)

1717

" to terminal")

2339

1718

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

2340

1719

help="Debug level for stdout output")

2341

1720

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

2348

1727

" files")

2349

1728

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

2350

1729

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

2351

" system bus interface", default=None)

1730

" system bus interface")

2352

1731

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

2353

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

2354

default=None)

2355

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

2356

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

2357

" state", default=None)

2358

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

2359

help="Specify a file descriptor to a network"

2360

" socket to use instead of creating one")

2361

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

2362

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

2363

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

2364

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

2365

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

2366

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

2367

default=None)

2368

1732

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

2369

1733

options = parser.parse_args()

2370

1734

2371

1735

if options.check:

2372

1736

import doctest

2373

fail_count, test_count = doctest.testmod()

2374

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

1737

doctest.testmod()

1738

sys.exit()

2375

1739

2376

1740

# Default values for config file for server-global settings

2377

1741

server_defaults = { "interface": "",

2379

1743

"port": "",

2380

1744

"debug": "False",

2381

1745

"priority":

2382

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

2383

":+SIGN-RSA-SHA224:+SIGN-RSA-RMD160",

1746

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

2384

1747

"servicename": "Mandos",

2385

1748

"use_dbus": "True",

2386

1749

"use_ipv6": "True",

2387

1750

"debuglevel": "",

2388

"restore": "True",

2389

"socket": "",

2390

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

2391

"foreground": "False",

2392

"zeroconf": "True",

2393

}

1751

}

2394

1752

2395

1753

# Parse config file for server-global settings

2396

1754

server_config = configparser.SafeConfigParser(server_defaults)

2397

1755

del server_defaults

2398

server_config.read(os.path.join(options.configdir, "mandos.conf"))

1756

server_config.read(os.path.join(options.configdir,

1757

"mandos.conf"))

2399

1758

# Convert the SafeConfigParser object to a dict

2400

1759

server_settings = server_config.defaults()

2401

1760

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

2402

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

1761

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

2403

1762

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

2404

1763

option)

2405

1764

if server_settings["port"]:

2406

1765

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

2407

1766

"port")

2408

if server_settings["socket"]:

2409

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

2410

"socket")

2411

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

2412

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

2413

# happen with a supplied network socket.

2414

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

2415

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

2416

["socket"])

2417

1767

del server_config

2418

1768

2419

1769

# Override the settings from the config file with command line

2420

1770

# options, if set.

2421

1771

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

2422

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

2423

"use_ipv6", "debuglevel", "restore", "statedir",

2424

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

1772

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

1773

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

2425

1774

value = getattr(options, option)

2426

1775

if value is not None:

2427

1776

server_settings[option] = value

2428

1777

del options

2429

1778

# Force all strings to be unicode

2430

1779

for option in server_settings.keys():

2431

if isinstance(server_settings[option], bytes):

2432

server_settings[option] = (server_settings[option]

2433

.decode("utf-8"))

2434

# Force all boolean options to be boolean

2435

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

2436

"foreground", "zeroconf"):

2437

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

2438

# Debug implies foreground

2439

if server_settings["debug"]:

2440

server_settings["foreground"] = True

1780

if type(server_settings[option]) is str:

1781

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

2441

1782

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

2442

1783

2443

1784

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

2444

1785

2445

if (not server_settings["zeroconf"]

2446

and not (server_settings["port"]

2447

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

2448

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

2449

2450

1786

# For convenience

2451

1787

debug = server_settings["debug"]

2452

1788

debuglevel = server_settings["debuglevel"]

2453

1789

use_dbus = server_settings["use_dbus"]

2454

1790

use_ipv6 = server_settings["use_ipv6"]

2455

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

2456

stored_state_file)

2457

foreground = server_settings["foreground"]

2458

zeroconf = server_settings["zeroconf"]

2459

2460

if debug:

2461

initlogger(debug, logging.DEBUG)

2462

else:

2463

if not debuglevel:

2464

initlogger(debug)

2465

else:

2466

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

2467

initlogger(debug, level)

2468

1791

2469

1792

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

2470

syslogger.setFormatter(

2471

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

2472

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

2473

server_settings["servicename"])))

1793

syslogger.setFormatter(logging.Formatter

1794

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

1795

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

1796

% server_settings["servicename"]))

2474

1797

2475

1798

# Parse config file with clients

2476

client_config = configparser.SafeConfigParser(Client

2477

.client_defaults)

1799

client_defaults = { "timeout": "1h",

1800

"interval": "5m",

1801

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

1802

"host": "",

1803

"approval_delay": "0s",

1804

"approval_duration": "1s",

1805

}

1806

client_config = configparser.SafeConfigParser(client_defaults)

2478

1807

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

2479

1808

"clients.conf"))

2480

1809

2481

1810

global mandos_dbus_service

2482

1811

mandos_dbus_service = None

2483

1812

2484

socketfd = None

2485

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

2486

socketfd = server_settings["socket"]

2487

tcp_server = MandosServer(

2488

(server_settings["address"], server_settings["port"]),

2489

ClientHandler,

2490

interface=(server_settings["interface"] or None),

2491

use_ipv6=use_ipv6,

2492

gnutls_priority=server_settings["priority"],

2493

use_dbus=use_dbus,

2494

socketfd=socketfd)

2495

if not foreground:

2496

pidfilename = "/run/mandos.pid"

2497

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

2498

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

2499

pidfile = None

1813

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

1814

server_settings["port"]),

1815

ClientHandler,

1816

interface=(server_settings["interface"]

1817

or None),

1818

use_ipv6=use_ipv6,

1819

gnutls_priority=

1820

server_settings["priority"],

1821

use_dbus=use_dbus)

1822

if not debug:

1823

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

2500

1824

try:

2501

1825

pidfile = open(pidfilename, "w")

2502

except IOError as e:

2503

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

2504

exc_info=e)

1826

except IOError:

1827

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

2505

1828

2506

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

1829

try:

1830

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

1831

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

1832

except KeyError:

2507

1833

try:

2508

uid = pwd.getpwnam(name).pw_uid

2509

gid = pwd.getpwnam(name).pw_gid

2510

break

1834

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

1835

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

2511

1836

except KeyError:

2512

continue

2513

else:

2514

uid = 65534

2515

gid = 65534

1837

try:

1838

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

1839

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

1840

except KeyError:

1841

uid = 65534

1842

gid = 65534

2516

1843

try:

2517

1844

os.setgid(gid)

2518

1845

os.setuid(uid)

2519

1846

except OSError as error:

2520

if error.errno != errno.EPERM:

2521

raise

1847

if error[0] != errno.EPERM:

1848

raise error

2522

1849

1850

if not debug and not debuglevel:

1851

syslogger.setLevel(logging.WARNING)

1852

console.setLevel(logging.WARNING)

1853

if debuglevel:

1854

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

1855

syslogger.setLevel(level)

1856

console.setLevel(level)

1857

2523

1858

if debug:

2524

1859

# Enable all possible GnuTLS debugging

2525

1860

2531

1866

def debug_gnutls(level, string):

2532

1867

logger.debug("GnuTLS: %s", string[:-1])

2533

1868

2534

gnutls.library.functions.gnutls_global_set_log_function(

2535

debug_gnutls)

1869

(gnutls.library.functions

1870

.gnutls_global_set_log_function(debug_gnutls))

2536

1871

2537

1872

# Redirect stdin so all checkers get /dev/null

2538

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

1873

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

2539

1874

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

2540

1875

if null > 2:

2541

1876

os.close(null)

1877

else:

1878

# No console logging

1879

logger.removeHandler(console)

2542

1880

2543

1881

# Need to fork before connecting to D-Bus

2544

if not foreground:

1882

if not debug:

2545

1883

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

2546

1884

daemon()

2547

1885

2548

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

2549

# need to inform gobject that threads will be used.

2550

gobject.threads_init()

2551

2552

1886

global main_loop

2553

1887

# From the Avahi example code

2554

DBusGMainLoop(set_as_default=True)

1888

DBusGMainLoop(set_as_default=True )

2555

1889

main_loop = gobject.MainLoop()

2556

1890

bus = dbus.SystemBus()

2557

1891

# End of Avahi example code

2558

1892

if use_dbus:

2559

1893

try:

2560

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

2561

bus,

2562

do_not_queue=True)

2563

old_bus_name = dbus.service.BusName(

2564

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

2565

do_not_queue=True)

1894

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

1895

bus, do_not_queue=True)

2566

1896

except dbus.exceptions.NameExistsException as e:

2567

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

1897

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

2568

1898

use_dbus = False

2569

1899

server_settings["use_dbus"] = False

2570

1900

tcp_server.use_dbus = False

2571

if zeroconf:

2572

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2573

service = AvahiServiceToSyslog(

2574

name = server_settings["servicename"],

2575

servicetype = "_mandos._tcp",

2576

protocol = protocol,

2577

bus = bus)

2578

if server_settings["interface"]:

2579

service.interface = if_nametoindex(

2580

server_settings["interface"].encode("utf-8"))

1901

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1902

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

1903

servicetype = "_mandos._tcp",

1904

protocol = protocol, bus = bus)

1905

if server_settings["interface"]:

1906

service.interface = (if_nametoindex

1907

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

2581

1908

2582

1909

global multiprocessing_manager

2583

1910

multiprocessing_manager = multiprocessing.Manager()

2585

1912

client_class = Client

2586

1913

if use_dbus:

2587

1914

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

2588

2589

client_settings = Client.config_parser(client_config)

2590

old_client_settings = {}

2591

clients_data = {}

2592

2593

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

2594

global wnull

2595

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

2596

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

2597

# mode

2598

if debug or not foreground:

2599

wnull.close()

2600

2601

# Get client data and settings from last running state.

2602

if server_settings["restore"]:

2603

try:

2604

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

2605

clients_data, old_client_settings = pickle.load(

2606

stored_state)

2607

os.remove(stored_state_path)

2608

except IOError as e:

2609

if e.errno == errno.ENOENT:

2610

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

2611

" {}".format(os.strerror(e.errno)))

2612

else:

2613

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

2614

exc_info=e)

2615

raise

2616

except EOFError as e:

2617

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

2618

"EOFError:",

2619

exc_info=e)

2620

2621

with PGPEngine() as pgp:

2622

for client_name, client in clients_data.items():

2623

# Skip removed clients

2624

if client_name not in client_settings:

2625

continue

2626

2627

# Decide which value to use after restoring saved state.

2628

# We have three different values: Old config file,

2629

# new config file, and saved state.

2630

# New config value takes precedence if it differs from old

2631

# config value, otherwise use saved state.

2632

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

2633

try:

2634

# For each value in new config, check if it

2635

# differs from the old config value (Except for

2636

# the "secret" attribute)

2637

if (name != "secret"

2638

and (value !=

2639

old_client_settings[client_name][name])):

2640

client[name] = value

2641

except KeyError:

2642

pass

2643

2644

# Clients who has passed its expire date can still be

2645

# enabled if its last checker was successful. Clients

2646

# whose checker succeeded before we stored its state is

2647

# assumed to have successfully run all checkers during

2648

# downtime.

2649

if client["enabled"]:

2650

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

2651

if not client["last_checked_ok"]:

2652

logger.warning(

2653

"disabling client {} - Client never "

2654

"performed a successful checker".format(

2655

client_name))

2656

client["enabled"] = False

2657

elif client["last_checker_status"] != 0:

2658

logger.warning(

2659

"disabling client {} - Client last"

2660

" checker failed with error code"

2661

" {}".format(

2662

client_name,

2663

client["last_checker_status"]))

2664

client["enabled"] = False

2665

else:

2666

client["expires"] = (

2667

datetime.datetime.utcnow()

2668

+ client["timeout"])

2669

logger.debug("Last checker succeeded,"

2670

" keeping {} enabled".format(

2671

client_name))

1915

def client_config_items(config, section):

1916

special_settings = {

1917

"approved_by_default":

1918

lambda: config.getboolean(section,

1919

"approved_by_default"),

1920

}

1921

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

2672

1922

try:

2673

client["secret"] = pgp.decrypt(

2674

client["encrypted_secret"],

2675

client_settings[client_name]["secret"])

2676

except PGPError:

2677

# If decryption fails, we use secret from new settings

2678

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

2679

client_name))

2680

client["secret"] = (client_settings[client_name]

2681

["secret"])

2682

2683

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

2684

for client_name in (set(old_client_settings)

2685

- set(client_settings)):

2686

del clients_data[client_name]

2687

for client_name in (set(client_settings)

2688

- set(old_client_settings)):

2689

clients_data[client_name] = client_settings[client_name]

2690

2691

# Create all client objects

2692

for client_name, client in clients_data.items():

2693

tcp_server.clients[client_name] = client_class(

2694

name = client_name,

2695

settings = client,

2696

server_settings = server_settings)

2697

1923

yield (name, special_settings[name]())

1924

except KeyError:

1925

yield (name, value)

1926

1927

tcp_server.clients.update(set(

1928

client_class(name = section,

1929

config= dict(client_config_items(

1930

client_config, section)))

1931

for section in client_config.sections()))

2698

1932

if not tcp_server.clients:

2699

1933

logger.warning("No clients defined")

2700

2701

if not foreground:

2702

if pidfile is not None:

2703

try:

2704

with pidfile:

2705

pid = os.getpid()

2706

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

2707

except IOError:

2708

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

2709

pidfilename, pid)

2710

del pidfile

1934

1935

if not debug:

1936

try:

1937

with pidfile:

1938

pid = os.getpid()

1939

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

1940

del pidfile

1941

except IOError:

1942

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

1943

pidfilename, pid)

1944

except NameError:

1945

# "pidfile" was never created

1946

pass

2711

1947

del pidfilename

2712

1948

1949

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

1950

2713

1951

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

2714

1952

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

2715

1953

2716

1954

if use_dbus:

2717

2718

@alternate_dbus_interfaces(

2719

{ "se.recompile.Mandos": "se.bsnet.fukt.Mandos" })

2720

class MandosDBusService(DBusObjectWithProperties):

1955

class MandosDBusService(dbus.service.Object):

2721

1956

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

2722

2723

1957

def __init__(self):

2724

1958

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

2725

2726

_interface = "se.recompile.Mandos"

2727

2728

@dbus_interface_annotations(_interface)

2729

def _foo(self):

2730

return {

2731

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

2732

"false" }

1959

_interface = "se.bsnet.fukt.Mandos"

2733

1960

2734

1961

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

2735

1962

def ClientAdded(self, objpath):

2749

1976

@dbus.service.method(_interface, out_signature="ao")

2750

1977

def GetAllClients(self):

2751

1978

"D-Bus method"

2752

return dbus.Array(c.dbus_object_path for c in

2753

tcp_server.clients.itervalues())

1979

return dbus.Array(c.dbus_object_path

1980

for c in tcp_server.clients)

2754

1981

2755

1982

@dbus.service.method(_interface,

2756

1983

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

2757

1984

def GetAllClientsWithProperties(self):

2758

1985

"D-Bus method"

2759

1986

return dbus.Dictionary(

2760

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

2761

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

1987

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

1988

for c in tcp_server.clients),

2762

1989

signature="oa{sv}")

2763

1990

2764

1991

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

2765

1992

def RemoveClient(self, object_path):

2766

1993

"D-Bus method"

2767

for c in tcp_server.clients.itervalues():

1994

for c in tcp_server.clients:

2768

1995

if c.dbus_object_path == object_path:

2769

del tcp_server.clients[c.name]

1996

tcp_server.clients.remove(c)

2770

1997

c.remove_from_connection()

2771

1998

# Don't signal anything except ClientRemoved

2772

1999

c.disable(quiet=True)

2781

2008

2782

2009

def cleanup():

2783

2010

"Cleanup function; run on exit"

2784

if zeroconf:

2785

service.cleanup()

2786

2787

multiprocessing.active_children()

2788

wnull.close()

2789

if not (tcp_server.clients or client_settings):

2790

return

2791

2792

# Store client before exiting. Secrets are encrypted with key

2793

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

2794

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

2795

clients = {}

2796

with PGPEngine() as pgp:

2797

for client in tcp_server.clients.itervalues():

2798

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

2799

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

2800

key)

2801

client_dict = {}

2802

2803

# A list of attributes that can not be pickled

2804

# + secret.

2805

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

2806

"checker", "server_settings" }

2807

for name, typ in inspect.getmembers(dbus.service

2808

.Object):

2809

exclude.add(name)

2810

2811

client_dict["encrypted_secret"] = (client

2812

.encrypted_secret)

2813

for attr in client.client_structure:

2814

if attr not in exclude:

2815

client_dict[attr] = getattr(client, attr)

2816

2817

clients[client.name] = client_dict

2818

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

2819

2820

try:

2821

with tempfile.NamedTemporaryFile(

2822

mode='wb',

2823

suffix=".pickle",

2824

prefix='clients-',

2825

dir=os.path.dirname(stored_state_path),

2826

delete=False) as stored_state:

2827

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

2828

tempname = stored_state.name

2829

os.rename(tempname, stored_state_path)

2830

except (IOError, OSError) as e:

2831

if not debug:

2832

try:

2833

os.remove(tempname)

2834

except NameError:

2835

pass

2836

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

2837

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

2838

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

2839

else:

2840

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

2841

exc_info=e)

2842

raise

2843

2844

# Delete all clients, and settings from config

2011

service.cleanup()

2012

2845

2013

while tcp_server.clients:

2846

name, client = tcp_server.clients.popitem()

2014

client = tcp_server.clients.pop()

2847

2015

if use_dbus:

2848

2016

client.remove_from_connection()

2017

client.disable_hook = None

2849

2018

# Don't signal anything except ClientRemoved

2850

2019

client.disable(quiet=True)

2851

2020

if use_dbus:

2852

2021

# Emit D-Bus signal

2853

mandos_dbus_service.ClientRemoved(

2854

client.dbus_object_path, client.name)

2855

client_settings.clear()

2022

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2023

client.name)

2856

2024

2857

2025

atexit.register(cleanup)

2858

2026

2859

for client in tcp_server.clients.itervalues():

2027

for client in tcp_server.clients:

2860

2028

if use_dbus:

2861

2029

# Emit D-Bus signal

2862

2030

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2863

# Need to initiate checking of clients

2864

if client.enabled:

2865

client.init_checker()

2031

client.enable()

2866

2032

2867

2033

tcp_server.enable()

2868

2034

tcp_server.server_activate()

2869

2035

2870

2036

# Find out what port we got

2871

if zeroconf:

2872

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

2037

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

2873

2038

if use_ipv6:

2874

2039

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

2875

" flowinfo %d, scope_id %d",

2876

*tcp_server.socket.getsockname())

2040

" flowinfo %d, scope_id %d"

2041

% tcp_server.socket.getsockname())

2877

2042

else: # IPv4

2878

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

2879

*tcp_server.socket.getsockname())

2043

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

2044

% tcp_server.socket.getsockname())

2880

2045

2881

2046

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

2882

2047

2883

2048

try:

2884

if zeroconf:

2885

# From the Avahi example code

2886

try:

2887

service.activate()

2888

except dbus.exceptions.DBusException as error:

2889

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

2890

cleanup()

2891

sys.exit(1)

2892

# End of Avahi example code

2049

# From the Avahi example code

2050

try:

2051

service.activate()

2052

except dbus.exceptions.DBusException as error:

2053

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

2054

cleanup()

2055

sys.exit(1)

2056

# End of Avahi example code

2893

2057

2894

2058

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

2895

2059

lambda *args, **kwargs:

2899

2063

logger.debug("Starting main loop")

2900

2064

main_loop.run()

2901

2065

except AvahiError as error:

2902

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

2066

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

2903

2067

cleanup()

2904

2068

sys.exit(1)

2905

2069

except KeyboardInterrupt:

2910

2074

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

2911

2075

cleanup()

2912

2076

2913

2914

2077

if __name__ == '__main__':

2915

2078

main()