/mandos/trunk : revision 482

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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 = "1.3.0"

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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.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match.remove()

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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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if self.group is None:

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew()),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew(),

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follow_name_owner_changes=True),

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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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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.error(bad_states[state])

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else:

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logger.error(bad_states[state] + ": %r", error)

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self.cleanup()

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if bad_states[state]:

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logger.error(bad_states[state])

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self.remove()

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elif state == avahi.SERVER_RUNNING:

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self.add()

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else:

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

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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)

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+ (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:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.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:

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config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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if "secret" in config:

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

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elif "secfile" in config:

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

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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

359

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

360

True)

557

361

self.approvals_pending = 0

558

self.changedstate = multiprocessing_manager.Condition(

559

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")

564

565

for name, t in inspect.getmembers(

566

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

567

if not name.startswith("_"):

568

self.client_structure.append(name)

362

self.approval_delay = string_to_delta(

363

config["approval_delay"])

364

self.approval_duration = string_to_delta(

365

config["approval_duration"])

366

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

569

367

570

# Send notice to process children that client state has changed

571

368

def send_changedstate(self):

572

with self.changedstate:

573

self.changedstate.notify_all()

574

369

self.changedstate.acquire()

370

self.changedstate.notify_all()

371

self.changedstate.release()

372

575

373

def enable(self):

576

374

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

577

375

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

578

376

# Already enabled

579

377

return

580

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

581

self.enabled = True

378

self.send_changedstate()

582

379

self.last_enabled = datetime.datetime.utcnow()

583

self.init_checker()

584

self.send_changedstate()

380

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

381

# and every interval from then on.

382

self.checker_initiator_tag = (gobject.timeout_add

383

(self.interval_milliseconds(),

384

self.start_checker))

385

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

386

self.disable_initiator_tag = (gobject.timeout_add

387

(self.timeout_milliseconds(),

388

self.disable))

389

self.enabled = True

390

# Also start a new checker *right now*.

391

self.start_checker()

585

392

586

393

def disable(self, quiet=True):

587

394

"""Disable this client."""

588

395

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

589

396

return False

590

397

if not quiet:

398

self.send_changedstate()

399

if not quiet:

591

400

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

592

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

401

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

593

402

gobject.source_remove(self.disable_initiator_tag)

594

403

self.disable_initiator_tag = None

595

self.expires = None

596

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

404

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

597

405

gobject.source_remove(self.checker_initiator_tag)

598

406

self.checker_initiator_tag = None

599

407

self.stop_checker()

408

if self.disable_hook:

409

self.disable_hook(self)

600

410

self.enabled = False

601

if not quiet:

602

self.send_changedstate()

603

411

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

604

412

return False

605

413

606

414

def __del__(self):

415

self.disable_hook = None

607

416

self.disable()

608

417

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

418

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

626

419

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

627

420

self.checker_callback_tag = None

628

421

self.checker = None

629

422

if os.WIFEXITED(condition):

630

self.last_checker_status = os.WEXITSTATUS(condition)

631

if self.last_checker_status == 0:

423

exitstatus = os.WEXITSTATUS(condition)

424

if exitstatus == 0:

632

425

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

633

426

vars(self))

634

427

self.checked_ok()

635

428

else:

636

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

429

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

430

vars(self))

637

431

else:

638

self.last_checker_status = -1

639

432

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

640

433

vars(self))

641

434

642

435

def checked_ok(self):

643

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

436

"""Bump up the timeout for this client.

437

438

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

439

alive and well.

440

"""

644

441

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

442

gobject.source_remove(self.disable_initiator_tag)

443

self.disable_initiator_tag = (gobject.timeout_add

444

(self.timeout_milliseconds(),

445

self.disable))

659

446

660

447

def need_approval(self):

661

448

self.last_approval_request = datetime.datetime.utcnow()

666

453

If a checker already exists, leave it running and do

667

454

nothing."""

668

455

# 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

456

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

457

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

458

# client would inevitably timeout, since no checker would get

459

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

673

460

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

674

461

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

675

462

# should be.

677

464

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

678

465

try:

679

466

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

467

except (AttributeError, OSError) as error:

468

if (isinstance(error, OSError)

469

and error.errno != errno.ECHILD):

470

raise error

685

471

else:

686

472

if pid:

687

473

logger.warning("Checker was a zombie")

690

476

self.current_checker_command)

691

477

# Start a new checker if needed

692

478

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

479

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

480

# In case checker_command has exactly one % operator

481

command = self.checker_command % self.host

482

except TypeError:

483

# Escape attributes for the shell

484

escaped_attrs = dict(

485

(attr,

486

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

487

errors=

488

'replace')))

489

for attr in

490

self.runtime_expansions)

491

492

try:

493

command = self.checker_command % escaped_attrs

494

except TypeError as error:

495

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

496

' %s', self.checker_command, error)

497

return True # Try again later

704

498

self.current_checker_command = command

705

499

try:

706

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

707

self.name)

500

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

501

command, self.name)

708

502

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

709

503

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

710

504

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

711

505

# 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

506

self.checker = subprocess.Popen(command,

721

507

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:

508

shell=True, cwd="/")

509

self.checker_callback_tag = (gobject.child_watch_add

510

(self.checker.pid,

511

self.checker_callback,

512

data=command))

513

# The checker may have completed before the gobject

514

# watch was added. Check for this.

734

515

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

516

if pid:

517

gobject.source_remove(self.checker_callback_tag)

518

self.checker_callback(pid, status, command)

735

519

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)

520

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

521

error)

745

522

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

746

523

return True

747

524

754

531

return

755

532

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

756

533

try:

757

self.checker.terminate()

534

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

758

535

#time.sleep(0.5)

759

536

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

760

# self.checker.kill()

537

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

761

538

except OSError as error:

762

539

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

763

540

raise

764

541

self.checker = None

765

542

766

767

def dbus_service_property(dbus_interface,

768

signature="v",

769

access="readwrite",

770

byte_arrays=False):

543

def dbus_service_property(dbus_interface, signature="v",

544

access="readwrite", byte_arrays=False):

771

545

"""Decorators for marking methods of a DBusObjectWithProperties to

772

546

become properties on the D-Bus.

773

547

782

556

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

783

557

if byte_arrays and signature != "ay":

784

558

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

785

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

786

559

" signature %r" % signature)

787

560

def decorator(func):

788

561

func._dbus_is_property = True

789

562

func._dbus_interface = dbus_interface

794

567

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

795

568

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

796

569

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

570

return decorator

840

571

841

572

842

573

class DBusPropertyException(dbus.exceptions.DBusException):

843

574

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

844

575

"""

845

pass

576

def __unicode__(self):

577

return unicode(str(self))

846

578

847

579

848

580

class DBusPropertyAccessException(DBusPropertyException):

859

591

860

592

class DBusObjectWithProperties(dbus.service.Object):

861

593

"""A D-Bus object with properties.

862

594

863

595

Classes inheriting from this can use the dbus_service_property

864

596

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

865

597

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

866

598

"""

867

599

868

600

@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)

601

def _is_dbus_property(obj):

602

return getattr(obj, "_dbus_is_property", False)

877

603

878

def _get_all_dbus_things(self, thing):

604

def _get_all_dbus_properties(self):

879

605

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

880

606

"""

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)))

607

return ((prop._dbus_name, prop)

608

for name, prop in

609

inspect.getmembers(self, self._is_dbus_property))

886

610

887

611

def _get_dbus_property(self, interface_name, property_name):

888

612

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

889

613

property with the specified name and interface.

890

614

"""

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

615

for name in (property_name,

616

property_name + "_dbus_property"):

617

prop = getattr(self, name, None)

618

if (prop is None

619

or not self._is_dbus_property(prop)

620

or prop._dbus_name != property_name

621

or (interface_name and prop._dbus_interface

622

and interface_name != prop._dbus_interface)):

623

continue

624

return prop

898

625

# No such property

899

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

900

self.dbus_object_path, interface_name, property_name))

626

raise DBusPropertyNotFound(self.dbus_object_path + ":"

627

+ interface_name + "."

628

+ property_name)

901

629

902

@dbus.service.method(dbus.PROPERTIES_IFACE,

903

in_signature="ss",

630

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

904

631

out_signature="v")

905

632

def Get(self, interface_name, property_name):

906

633

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

924

651

# The byte_arrays option is not supported yet on

925

652

# signatures other than "ay".

926

653

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))

654

raise ValueError

655

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

656

for byte in value))

932

657

prop(value)

933

658

934

@dbus.service.method(dbus.PROPERTIES_IFACE,

935

in_signature="s",

659

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

936

660

out_signature="a{sv}")

937

661

def GetAll(self, interface_name):

938

662

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

939

663

standard.

940

664

941

665

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

942

666

"""

943

properties = {}

944

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

667

all = {}

668

for name, prop in self._get_all_dbus_properties():

945

669

if (interface_name

946

670

and interface_name != prop._dbus_interface):

947

671

# Interface non-empty but did not match

951

675

continue

952

676

value = prop()

953

677

if not hasattr(value, "variant_level"):

954

properties[name] = value

678

all[name] = value

955

679

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

680

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

681

value.variant_level+1)

682

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

967

683

968

684

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

969

685

out_signature="s",

970

686

path_keyword='object_path',

971

687

connection_keyword='connection')

972

688

def Introspect(self, object_path, connection):

973

"""Overloading of standard D-Bus method.

974

975

Inserts property tags and interface annotation tags.

689

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

976

690

"""

977

691

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

978

692

connection)

979

693

try:

980

694

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

981

982

695

def make_tag(document, name, prop):

983

696

e = document.createElement("property")

984

697

e.setAttribute("name", name)

985

698

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

986

699

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

987

700

return e

988

989

701

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

990

# Add property tags

991

702

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

992

703

for name, prop

993

in self._get_all_dbus_things("property")

704

in self._get_all_dbus_properties()

994

705

if prop._dbus_interface

995

706

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

996

707

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

708

# Add the names to the return values for the

1027

709

# "org.freedesktop.DBus.Properties" methods

1028

710

if (if_tag.getAttribute("name")

1043

725

except (AttributeError, xml.dom.DOMException,

1044

726

xml.parsers.expat.ExpatError) as error:

1045

727

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

1046

exc_info=error)

728

error)

1047

729

return xmlstring

1048

730

1049

731

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

732

class ClientDBus(Client, DBusObjectWithProperties):

1229

733

"""A Client class using D-Bus

1230

734

1234

738

"""

1235

739

1236

740

runtime_expansions = (Client.runtime_expansions

1237

+ ("dbus_object_path", ))

1238

1239

_interface = "se.recompile.Mandos.Client"

741

+ ("dbus_object_path",))

1240

742

1241

743

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

1242

744

1243

745

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

746

self._approvals_pending = 0

1244

747

self.bus = bus

1245

748

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

1246

749

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

1247

750

# the D-Bus

1248

client_object_name = str(self.name).translate(

751

client_object_name = unicode(self.name).translate(

1249

752

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

1250

753

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

1251

self.dbus_object_path = dbus.ObjectPath(

1252

"/clients/" + client_object_name)

754

self.dbus_object_path = (dbus.ObjectPath

755

("/clients/" + client_object_name))

1253

756

DBusObjectWithProperties.__init__(self, self.bus,

1254

757

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

758

759

def _get_approvals_pending(self):

760

return self._approvals_pending

761

def _set_approvals_pending(self, value):

762

old_value = self._approvals_pending

763

self._approvals_pending = value

764

bval = bool(value)

765

if (hasattr(self, "dbus_object_path")

766

and bval is not bool(old_value)):

767

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

768

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

769

dbus_bool)

770

771

approvals_pending = property(_get_approvals_pending,

772

_set_approvals_pending)

773

del _get_approvals_pending, _set_approvals_pending

774

775

@staticmethod

776

def _datetime_to_dbus(dt, variant_level=0):

777

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

778

return dbus.String(dt.isoformat(),

779

variant_level=variant_level)

780

781

def enable(self):

782

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

783

r = Client.enable(self)

784

if oldstate != self.enabled:

785

# Emit D-Bus signals

786

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

787

dbus.Boolean(True, variant_level=1))

788

self.PropertyChanged(

789

dbus.String("LastEnabled"),

790

self._datetime_to_dbus(self.last_enabled,

791

variant_level=1))

792

return r

793

794

def disable(self, quiet = False):

795

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

796

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

797

if not quiet and oldstate != self.enabled:

798

# Emit D-Bus signal

799

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

800

dbus.Boolean(False, variant_level=1))

801

return r

1336

802

1337

803

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

1338

804

try:

1347

813

*args, **kwargs):

1348

814

self.checker_callback_tag = None

1349

815

self.checker = None

816

# Emit D-Bus signal

817

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

818

dbus.Boolean(False, variant_level=1))

1350

819

if os.WIFEXITED(condition):

1351

820

exitstatus = os.WEXITSTATUS(condition)

1352

821

# Emit D-Bus signal

1362

831

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

1363

832

*args, **kwargs)

1364

833

834

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

835

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

836

# Emit D-Bus signal

837

self.PropertyChanged(

838

dbus.String("LastCheckedOK"),

839

(self._datetime_to_dbus(self.last_checked_ok,

840

variant_level=1)))

841

842

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

843

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

844

# Emit D-Bus signal

845

self.PropertyChanged(

846

dbus.String("LastApprovalRequest"),

847

(self._datetime_to_dbus(self.last_approval_request,

848

variant_level=1)))

849

return r

850

1365

851

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

1366

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

852

old_checker = self.checker

853

if self.checker is not None:

854

old_checker_pid = self.checker.pid

855

else:

856

old_checker_pid = None

1367

857

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

1368

858

# Only if new checker process was started

1369

859

if (self.checker is not None

1370

860

and old_checker_pid != self.checker.pid):

1371

861

# Emit D-Bus signal

1372

862

self.CheckerStarted(self.current_checker_command)

863

self.PropertyChanged(

864

dbus.String("CheckerRunning"),

865

dbus.Boolean(True, variant_level=1))

1373

866

return r

1374

867

868

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

869

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

870

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

871

if (old_checker is not None

872

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

873

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

874

dbus.Boolean(False, variant_level=1))

875

return r

876

1375

877

def _reset_approved(self):

1376

self.approved = None

878

self._approved = None

1377

879

return False

1378

880

1379

881

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

882

self.send_changedstate()

883

self._approved = value

884

gobject.timeout_add(self._timedelta_to_milliseconds

885

(self.approval_duration),

886

self._reset_approved)

887

1384

888

1385

889

## D-Bus methods, signals & properties

1386

1387

## Interfaces

890

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

1388

891

1389

892

## Signals

1390

893

1401

904

pass

1402

905

1403

906

# PropertyChanged - signal

1404

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

1405

907

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

1406

908

def PropertyChanged(self, property, value):

1407

909

"D-Bus signal"

1471

973

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

1472

974

1473

975

# ApprovedByDefault - property

1474

@dbus_service_property(_interface,

1475

signature="b",

976

@dbus_service_property(_interface, signature="b",

1476

977

access="readwrite")

1477

978

def ApprovedByDefault_dbus_property(self, value=None):

1478

979

if value is None: # get

1479

980

return dbus.Boolean(self.approved_by_default)

1480

981

self.approved_by_default = bool(value)

982

# Emit D-Bus signal

983

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

984

dbus.Boolean(value, variant_level=1))

1481

985

1482

986

# ApprovalDelay - property

1483

@dbus_service_property(_interface,

1484

signature="t",

987

@dbus_service_property(_interface, signature="t",

1485

988

access="readwrite")

1486

989

def ApprovalDelay_dbus_property(self, value=None):

1487

990

if value is None: # get

1488

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

1489

* 1000)

991

return dbus.UInt64(self.approval_delay_milliseconds())

1490

992

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

993

# Emit D-Bus signal

994

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

995

dbus.UInt64(value, variant_level=1))

1491

996

1492

997

# ApprovalDuration - property

1493

@dbus_service_property(_interface,

1494

signature="t",

998

@dbus_service_property(_interface, signature="t",

1495

999

access="readwrite")

1496

1000

def ApprovalDuration_dbus_property(self, value=None):

1497

1001

if value is None: # get

1498

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

1499

* 1000)

1002

return dbus.UInt64(self._timedelta_to_milliseconds(

1003

self.approval_duration))

1500

1004

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

1005

# Emit D-Bus signal

1006

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

1007

dbus.UInt64(value, variant_level=1))

1501

1008

1502

1009

# Name - property

1503

1010

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

1510

1017

return dbus.String(self.fingerprint)

1511

1018

1512

1019

# Host - property

1513

@dbus_service_property(_interface,

1514

signature="s",

1020

@dbus_service_property(_interface, signature="s",

1515

1021

access="readwrite")

1516

1022

def Host_dbus_property(self, value=None):

1517

1023

if value is None: # get

1518

1024

return dbus.String(self.host)

1519

self.host = str(value)

1025

self.host = value

1026

# Emit D-Bus signal

1027

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

1028

dbus.String(value, variant_level=1))

1520

1029

1521

1030

# Created - property

1522

1031

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

1523

1032

def Created_dbus_property(self):

1524

return datetime_to_dbus(self.created)

1033

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

1525

1034

1526

1035

# LastEnabled - property

1527

1036

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

1528

1037

def LastEnabled_dbus_property(self):

1529

return datetime_to_dbus(self.last_enabled)

1038

if self.last_enabled is None:

1039

return dbus.String("")

1040

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

1530

1041

1531

1042

# Enabled - property

1532

@dbus_service_property(_interface,

1533

signature="b",

1043

@dbus_service_property(_interface, signature="b",

1534

1044

access="readwrite")

1535

1045

def Enabled_dbus_property(self, value=None):

1536

1046

if value is None: # get

1541

1051

self.disable()

1542

1052

1543

1053

# LastCheckedOK - property

1544

@dbus_service_property(_interface,

1545

signature="s",

1054

@dbus_service_property(_interface, signature="s",

1546

1055

access="readwrite")

1547

1056

def LastCheckedOK_dbus_property(self, value=None):

1548

1057

if value is not None:

1549

1058

self.checked_ok()

1550

1059

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)

1060

if self.last_checked_ok is None:

1061

return dbus.String("")

1062

return dbus.String(self._datetime_to_dbus(self

1063

.last_checked_ok))

1562

1064

1563

1065

# LastApprovalRequest - property

1564

1066

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

1565

1067

def LastApprovalRequest_dbus_property(self):

1566

return datetime_to_dbus(self.last_approval_request)

1068

if self.last_approval_request is None:

1069

return dbus.String("")

1070

return dbus.String(self.

1071

_datetime_to_dbus(self

1072

.last_approval_request))

1567

1073

1568

1074

# Timeout - property

1569

@dbus_service_property(_interface,

1570

signature="t",

1075

@dbus_service_property(_interface, signature="t",

1571

1076

access="readwrite")

1572

1077

def Timeout_dbus_property(self, value=None):

1573

1078

if value is None: # get

1574

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

1575

old_timeout = self.timeout

1079

return dbus.UInt64(self.timeout_milliseconds())

1576

1080

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)

1081

# Emit D-Bus signal

1082

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

1083

dbus.UInt64(value, variant_level=1))

1084

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

1085

return

1086

# Reschedule timeout

1087

gobject.source_remove(self.disable_initiator_tag)

1088

self.disable_initiator_tag = None

1089

time_to_die = (self.

1090

_timedelta_to_milliseconds((self

1091

.last_checked_ok

1092

+ self.timeout)

1093

- datetime.datetime

1094

.utcnow()))

1095

if time_to_die <= 0:

1096

# The timeout has passed

1097

self.disable()

1098

else:

1099

self.disable_initiator_tag = (gobject.timeout_add

1100

(time_to_die, self.disable))

1602

1101

1603

1102

# Interval - property

1604

@dbus_service_property(_interface,

1605

signature="t",

1103

@dbus_service_property(_interface, signature="t",

1606

1104

access="readwrite")

1607

1105

def Interval_dbus_property(self, value=None):

1608

1106

if value is None: # get

1609

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

1107

return dbus.UInt64(self.interval_milliseconds())

1610

1108

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

1109

# Emit D-Bus signal

1110

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

1111

dbus.UInt64(value, variant_level=1))

1611

1112

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

1612

1113

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

1114

# Reschedule checker run

1115

gobject.source_remove(self.checker_initiator_tag)

1116

self.checker_initiator_tag = (gobject.timeout_add

1117

(value, self.start_checker))

1118

self.start_checker() # Start one now, too

1119

1620

1120

# Checker - property

1621

@dbus_service_property(_interface,

1622

signature="s",

1121

@dbus_service_property(_interface, signature="s",

1623

1122

access="readwrite")

1624

1123

def Checker_dbus_property(self, value=None):

1625

1124

if value is None: # get

1626

1125

return dbus.String(self.checker_command)

1627

self.checker_command = str(value)

1126

self.checker_command = value

1127

# Emit D-Bus signal

1128

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

1129

dbus.String(self.checker_command,

1130

variant_level=1))

1628

1131

1629

1132

# CheckerRunning - property

1630

@dbus_service_property(_interface,

1631

signature="b",

1133

@dbus_service_property(_interface, signature="b",

1632

1134

access="readwrite")

1633

1135

def CheckerRunning_dbus_property(self, value=None):

1634

1136

if value is None: # get

1644

1146

return self.dbus_object_path # is already a dbus.ObjectPath

1645

1147

1646

1148

# Secret = property

1647

@dbus_service_property(_interface,

1648

signature="ay",

1649

access="write",

1650

byte_arrays=True)

1149

@dbus_service_property(_interface, signature="ay",

1150

access="write", byte_arrays=True)

1651

1151

def Secret_dbus_property(self, value):

1652

self.secret = bytes(value)

1152

self.secret = str(value)

1653

1153

1654

1154

del _interface

1655

1155

1660

1160

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

1661

1161

if not self._pipe.recv():

1662

1162

raise KeyError()

1663

1163

1664

1164

def __getattribute__(self, name):

1665

if name == '_pipe':

1165

if(name == '_pipe'):

1666

1166

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

1667

1167

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

1668

1168

data = self._pipe.recv()

1669

1169

if data[0] == 'data':

1670

1170

return data[1]

1671

1171

if data[0] == 'function':

1672

1673

1172

def func(*args, **kwargs):

1674

1173

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

1675

1174

return self._pipe.recv()[1]

1676

1677

1175

return func

1678

1176

1679

1177

def __setattr__(self, name, value):

1680

if name == '_pipe':

1178

if(name == '_pipe'):

1681

1179

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

1682

1180

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

1683

1181

1691

1189

def handle(self):

1692

1190

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

1693

1191

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

1694

str(self.client_address))

1192

unicode(self.client_address))

1695

1193

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

1696

1194

self.server.child_pipe.fileno())

1697

1698

session = gnutls.connection.ClientSession(

1699

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

1700

1195

1196

session = (gnutls.connection

1197

.ClientSession(self.request,

1198

gnutls.connection

1199

.X509Credentials()))

1200

1701

1201

# Note: gnutls.connection.X509Credentials is really a

1702

1202

# generic GnuTLS certificate credentials object so long as

1703

1203

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

1704

1204

# here despite using OpenPGP certificates.

1705

1205

1706

1206

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

1707

1207

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

1708

1208

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

1711

1211

priority = self.server.gnutls_priority

1712

1212

if priority is None:

1713

1213

priority = "NORMAL"

1714

gnutls.library.functions.gnutls_priority_set_direct(

1715

session._c_object, priority, None)

1716

1214

(gnutls.library.functions

1215

.gnutls_priority_set_direct(session._c_object,

1216

priority, None))

1217

1717

1218

# Start communication using the Mandos protocol

1718

1219

# Get protocol number

1719

1220

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

1720

1221

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

1721

1222

try:

1722

1223

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

1723

raise RuntimeError(line)

1224

raise RuntimeError

1724

1225

except (ValueError, IndexError, RuntimeError) as error:

1725

1226

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

1726

1227

return

1727

1228

1728

1229

# Start GnuTLS connection

1729

1230

try:

1730

1231

session.handshake()

1734

1235

# established. Just abandon the request.

1735

1236

return

1736

1237

logger.debug("Handshake succeeded")

1737

1238

1738

1239

approval_required = False

1739

1240

try:

1740

1241

try:

1741

fpr = self.fingerprint(

1742

self.peer_certificate(session))

1242

fpr = self.fingerprint(self.peer_certificate

1243

(session))

1743

1244

except (TypeError,

1744

1245

gnutls.errors.GNUTLSError) as error:

1745

1246

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

1746

1247

return

1747

1248

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

1748

1249

1749

1250

try:

1750

1251

client = ProxyClient(child_pipe, fpr,

1751

1252

self.client_address)

1759

1260

1760

1261

while True:

1761

1262

if not client.enabled:

1762

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

1763

client.name)

1263

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

1264

client.name)

1764

1265

if self.server.use_dbus:

1765

1266

# Emit D-Bus signal

1766

client.Rejected("Disabled")

1267

client.Rejected("Disabled")

1767

1268

return

1768

1269

1769

if client.approved or not client.approval_delay:

1270

if client._approved or not client.approval_delay:

1770

1271

#We are approved or approval is disabled

1771

1272

break

1772

elif client.approved is None:

1273

elif client._approved is None:

1773

1274

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

1774

1275

client.name)

1775

1276

if self.server.use_dbus:

1776

1277

# Emit D-Bus signal

1777

1278

client.NeedApproval(

1778

client.approval_delay.total_seconds()

1779

* 1000, client.approved_by_default)

1279

client.approval_delay_milliseconds(),

1280

client.approved_by_default)

1780

1281

else:

1781

1282

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

1782

1283

client.name)

1786

1287

return

1787

1288

1788

1289

#wait until timeout or approved

1290

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

1789

1291

time = datetime.datetime.now()

1790

1292

client.changedstate.acquire()

1791

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

1293

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

1792

1294

client.changedstate.release()

1793

1295

time2 = datetime.datetime.now()

1794

1296

if (time2 - time) >= delay:

1810

1312

try:

1811

1313

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

1812

1314

except gnutls.errors.GNUTLSError as error:

1813

logger.warning("gnutls send failed",

1814

exc_info=error)

1315

logger.warning("gnutls send failed")

1815

1316

return

1816

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

1817

len(client.secret) - (sent_size

1818

+ sent))

1317

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

1318

sent, len(client.secret)

1319

- (sent_size + sent))

1819

1320

sent_size += sent

1820

1321

1821

1322

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

1822

# bump the timeout using extended_timeout

1823

client.bump_timeout(client.extended_timeout)

1323

# bump the timeout as if seen

1324

client.checked_ok()

1824

1325

if self.server.use_dbus:

1825

1326

# Emit D-Bus signal

1826

1327

client.GotSecret()

1831

1332

try:

1832

1333

session.bye()

1833

1334

except gnutls.errors.GNUTLSError as error:

1834

logger.warning("GnuTLS bye failed",

1835

exc_info=error)

1335

logger.warning("GnuTLS bye failed")

1836

1336

1837

1337

@staticmethod

1838

1338

def peer_certificate(session):

1839

1339

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

1840

1340

# If not an OpenPGP certificate...

1841

if (gnutls.library.functions.gnutls_certificate_type_get(

1842

session._c_object)

1341

if (gnutls.library.functions

1342

.gnutls_certificate_type_get(session._c_object)

1843

1343

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1844

1344

# ...do the normal thing

1845

1345

return session.peer_certificate

1859

1359

def fingerprint(openpgp):

1860

1360

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1861

1361

# 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)))

1362

datum = (gnutls.library.types

1363

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

1364

ctypes.POINTER

1365

(ctypes.c_ubyte)),

1366

ctypes.c_uint(len(openpgp))))

1866

1367

# New empty GnuTLS certificate

1867

1368

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1868

gnutls.library.functions.gnutls_openpgp_crt_init(

1869

ctypes.byref(crt))

1369

(gnutls.library.functions

1370

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

1870

1371

# 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)

1372

(gnutls.library.functions

1373

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

1374

gnutls.library.constants

1375

.GNUTLS_OPENPGP_FMT_RAW))

1874

1376

# Verify the self signature in the key

1875

1377

crtverify = ctypes.c_uint()

1876

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1877

crt, 0, ctypes.byref(crtverify))

1378

(gnutls.library.functions

1379

.gnutls_openpgp_crt_verify_self(crt, 0,

1380

ctypes.byref(crtverify)))

1878

1381

if crtverify.value != 0:

1879

1382

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1880

raise gnutls.errors.CertificateSecurityError(

1881

"Verify failed")

1383

raise (gnutls.errors.CertificateSecurityError

1384

("Verify failed"))

1882

1385

# New buffer for the fingerprint

1883

1386

buf = ctypes.create_string_buffer(20)

1884

1387

buf_len = ctypes.c_size_t()

1885

1388

# 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))

1389

(gnutls.library.functions

1390

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

1391

ctypes.byref(buf_len)))

1888

1392

# Deinit the certificate

1889

1393

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1890

1394

# Convert the buffer to a Python bytestring

1891

1395

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

1892

1396

# Convert the bytestring to hexadecimal notation

1893

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

1397

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

1894

1398

return hex_fpr

1895

1399

1896

1400

1897

1401

class MultiprocessingMixIn(object):

1898

1402

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

1899

1900

1403

def sub_process_main(self, request, address):

1901

1404

try:

1902

1405

self.finish_request(request, address)

1903

except Exception:

1406

except:

1904

1407

self.handle_error(request, address)

1905

1408

self.close_request(request)

1906

1409

1907

1410

def process_request(self, request, address):

1908

1411

"""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

1412

multiprocessing.Process(target = self.sub_process_main,

1413

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

1914

1414

1915

1415

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1916

1416

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

1917

1918

1417

def process_request(self, request, client_address):

1919

1418

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

1920

1419

1921

1420

This function creates a new pipe in self.pipe

1922

1421

"""

1923

1422

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1924

1925

proc = MultiprocessingMixIn.process_request(self, request,

1926

client_address)

1423

1424

super(MultiprocessingMixInWithPipe,

1425

self).process_request(request, client_address)

1927

1426

self.child_pipe.close()

1928

self.add_pipe(parent_pipe, proc)

1929

1930

def add_pipe(self, parent_pipe, proc):

1427

self.add_pipe(parent_pipe)

1428

1429

def add_pipe(self, parent_pipe):

1931

1430

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

1932

raise NotImplementedError()

1933

1431

raise NotImplementedError

1934

1432

1935

1433

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1936

1434

socketserver.TCPServer, object):

1941

1439

interface: None or a network interface name (string)

1942

1440

use_ipv6: Boolean; to use IPv6 or not

1943

1441

"""

1944

1945

1442

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

"""

1443

interface=None, use_ipv6=True):

1952

1444

self.interface = interface

1953

1445

if use_ipv6:

1954

1446

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

1447

socketserver.TCPServer.__init__(self, server_address,

1982

1448

RequestHandlerClass)

1983

1984

1449

def server_bind(self):

1985

1450

"""This overrides the normal server_bind() function

1986

1451

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

1992

1457

self.interface)

1993

1458

else:

1994

1459

try:

1995

self.socket.setsockopt(

1996

socket.SOL_SOCKET, SO_BINDTODEVICE,

1997

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

1460

self.socket.setsockopt(socket.SOL_SOCKET,

1461

SO_BINDTODEVICE,

1462

str(self.interface

1463

+ '\0'))

1998

1464

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:

1465

if error[0] == errno.EPERM:

1466

logger.error("No permission to"

1467

" bind to interface %s",

1468

self.interface)

1469

elif error[0] == errno.ENOPROTOOPT:

2003

1470

logger.error("SO_BINDTODEVICE not available;"

2004

1471

" cannot bind to interface %s",

2005

1472

self.interface)

2006

elif error.errno == errno.ENODEV:

2007

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

2008

" cannot bind", self.interface)

2009

1473

else:

2010

1474

raise

2011

1475

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

2014

1478

if self.address_family == socket.AF_INET6:

2015

1479

any_address = "::" # in6addr_any

2016

1480

else:

2017

any_address = "0.0.0.0" # INADDR_ANY

1481

any_address = socket.INADDR_ANY

2018

1482

self.server_address = (any_address,

2019

1483

self.server_address[1])

2020

1484

elif not self.server_address[1]:

2021

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

1485

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

1486

0)

2022

1487

# if self.interface:

2023

1488

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

2024

1489

# 0, # port

2038

1503

2039

1504

Assumes a gobject.MainLoop event loop.

2040

1505

"""

2041

2042

1506

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):

1507

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

1508

gnutls_priority=None, use_dbus=True):

2049

1509

self.enabled = False

2050

1510

self.clients = clients

2051

1511

if self.clients is None:

2052

self.clients = {}

1512

self.clients = set()

2053

1513

self.use_dbus = use_dbus

2054

1514

self.gnutls_priority = gnutls_priority

2055

1515

IPv6_TCPServer.__init__(self, server_address,

2056

1516

RequestHandlerClass,

2057

1517

interface = interface,

2058

use_ipv6 = use_ipv6,

2059

socketfd = socketfd)

2060

1518

use_ipv6 = use_ipv6)

2061

1519

def server_activate(self):

2062

1520

if self.enabled:

2063

1521

return socketserver.TCPServer.server_activate(self)

2064

2065

1522

def enable(self):

2066

1523

self.enabled = True

2067

2068

def add_pipe(self, parent_pipe, proc):

1524

def add_pipe(self, parent_pipe):

2069

1525

# 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,

1526

gobject.io_add_watch(parent_pipe.fileno(),

1527

gobject.IO_IN | gobject.IO_HUP,

1528

functools.partial(self.handle_ipc,

1529

parent_pipe = parent_pipe))

1530

1531

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

2080

1532

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()

1533

condition_names = {

1534

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

1535

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

1536

# blocking).

1537

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

1538

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

1539

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

1540

# broken, usually for pipes and

1541

# sockets).

1542

}

1543

conditions_string = ' | '.join(name

1544

for cond, name in

1545

condition_names.iteritems()

1546

if cond & condition)

1547

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

1548

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

2085

1549

return False

2086

1550

2087

1551

# Read a request from the child

2092

1556

fpr = request[1]

2093

1557

address = request[2]

2094

1558

2095

for c in self.clients.itervalues():

1559

for c in self.clients:

2096

1560

if c.fingerprint == fpr:

2097

1561

client = c

2098

1562

break

2099

1563

else:

2100

logger.info("Client not found for fingerprint: %s, ad"

2101

"dress: %s", fpr, address)

1564

logger.warning("Client not found for fingerprint: %s, ad"

1565

"dress: %s", fpr, address)

2102

1566

if self.use_dbus:

2103

1567

# Emit D-Bus signal

2104

mandos_dbus_service.ClientNotFound(fpr,

2105

address[0])

1568

mandos_dbus_service.ClientNotFound(fpr, address[0])

2106

1569

parent_pipe.send(False)

2107

1570

return False

2108

1571

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))

1572

gobject.io_add_watch(parent_pipe.fileno(),

1573

gobject.IO_IN | gobject.IO_HUP,

1574

functools.partial(self.handle_ipc,

1575

parent_pipe = parent_pipe,

1576

client_object = client))

2116

1577

parent_pipe.send(True)

2117

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

2118

# same fileno

1578

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

2119

1579

return False

2120

1580

if command == 'funcall':

2121

1581

funcname = request[1]

2122

1582

args = request[2]

2123

1583

kwargs = request[3]

2124

1584

2125

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

2126

funcname)(*args,

2127

**kwargs)))

2128

1585

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

1586

2129

1587

if command == 'getattr':

2130

1588

attrname = request[1]

2131

1589

if callable(client_object.__getattribute__(attrname)):

2132

parent_pipe.send(('function', ))

1590

parent_pipe.send(('function',))

2133

1591

else:

2134

parent_pipe.send((

2135

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

1592

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

2136

1593

2137

1594

if command == 'setattr':

2138

1595

attrname = request[1]

2139

1596

value = request[2]

2140

1597

setattr(client_object, attrname, value)

2141

1598

2142

1599

return True

2143

1600

2144

1601

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

1602

def string_to_delta(interval):

2250

1603

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

2251

1604

2262

1615

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

2263

1616

datetime.timedelta(0, 330)

2264

1617

"""

2265

2266

try:

2267

return rfc3339_duration_to_delta(interval)

2268

except ValueError:

2269

pass

2270

2271

1618

timevalue = datetime.timedelta(0)

2272

1619

for s in interval.split():

2273

1620

try:

2274

suffix = s[-1]

1621

suffix = unicode(s[-1])

2275

1622

value = int(s[:-1])

2276

1623

if suffix == "d":

2277

1624

delta = datetime.timedelta(value)

2284

1631

elif suffix == "w":

2285

1632

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

2286

1633

else:

2287

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

2288

except IndexError as e:

1634

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

1635

except (ValueError, IndexError) as e:

2289

1636

raise ValueError(*(e.args))

2290

1637

timevalue += delta

2291

1638

return timevalue

2292

1639

2293

1640

1641

def if_nametoindex(interface):

1642

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

1643

1644

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

1645

global if_nametoindex

1646

try:

1647

if_nametoindex = (ctypes.cdll.LoadLibrary

1648

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

1649

.if_nametoindex)

1650

except (OSError, AttributeError):

1651

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

1652

def if_nametoindex(interface):

1653

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

1654

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

1655

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

1656

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1657

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

1658

interface))

1659

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

1660

ifreq[16:20])[0]

1661

return interface_index

1662

return if_nametoindex(interface)

1663

1664

2294

1665

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

2295

1666

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

2296

1667

2304

1675

sys.exit()

2305

1676

if not noclose:

2306

1677

# Close all standard open file descriptors

2307

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

1678

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

2308

1679

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

2309

1680

raise OSError(errno.ENODEV,

2310

"{} not a character device"

2311

.format(os.devnull))

1681

"%s not a character device"

1682

% os.path.devnull)

2312

1683

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

2313

1684

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

2314

1685

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

2323

1694

2324

1695

parser = argparse.ArgumentParser()

2325

1696

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

2326

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

1697

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

2327

1698

help="show version number and exit")

2328

1699

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

2329

1700

help="Bind to interface IF")

2335

1706

help="Run self-test")

2336

1707

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

2337

1708

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

2338

" to terminal", default=None)

1709

" to terminal")

2339

1710

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

2340

1711

help="Debug level for stdout output")

2341

1712

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

2348

1719

" files")

2349

1720

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

2350

1721

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

2351

" system bus interface", default=None)

1722

" system bus interface")

2352

1723

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

1724

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

2369

1725

options = parser.parse_args()

2370

1726

2371

1727

if options.check:

2372

1728

import doctest

2373

fail_count, test_count = doctest.testmod()

2374

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

1729

doctest.testmod()

1730

sys.exit()

2375

1731

2376

1732

# Default values for config file for server-global settings

2377

1733

server_defaults = { "interface": "",

2379

1735

"port": "",

2380

1736

"debug": "False",

2381

1737

"priority":

2382

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

2383

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

1738

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

2384

1739

"servicename": "Mandos",

2385

1740

"use_dbus": "True",

2386

1741

"use_ipv6": "True",

2387

1742

"debuglevel": "",

2388

"restore": "True",

2389

"socket": "",

2390

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

2391

"foreground": "False",

2392

"zeroconf": "True",

2393

}

1743

}

2394

1744

2395

1745

# Parse config file for server-global settings

2396

1746

server_config = configparser.SafeConfigParser(server_defaults)

2397

1747

del server_defaults

2398

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

1748

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

1749

"mandos.conf"))

2399

1750

# Convert the SafeConfigParser object to a dict

2400

1751

server_settings = server_config.defaults()

2401

1752

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

2402

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

1753

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

2403

1754

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

2404

1755

option)

2405

1756

if server_settings["port"]:

2406

1757

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

2407

1758

"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

1759

del server_config

2418

1760

2419

1761

# Override the settings from the config file with command line

2420

1762

# options, if set.

2421

1763

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

2422

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

2423

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

2424

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

1764

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

1765

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

2425

1766

value = getattr(options, option)

2426

1767

if value is not None:

2427

1768

server_settings[option] = value

2428

1769

del options

2429

1770

# Force all strings to be unicode

2430

1771

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

1772

if type(server_settings[option]) is str:

1773

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

2441

1774

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

2442

1775

2443

1776

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

2444

1777

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

1778

# For convenience

2451

1779

debug = server_settings["debug"]

2452

1780

debuglevel = server_settings["debuglevel"]

2453

1781

use_dbus = server_settings["use_dbus"]

2454

1782

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

1783

2469

1784

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

2470

syslogger.setFormatter(

2471

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

2472

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

2473

server_settings["servicename"])))

1785

syslogger.setFormatter(logging.Formatter

1786

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

1787

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

1788

% server_settings["servicename"]))

2474

1789

2475

1790

# Parse config file with clients

2476

client_config = configparser.SafeConfigParser(Client

2477

.client_defaults)

1791

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

1792

"interval": "5m",

1793

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

1794

"host": "",

1795

"approval_delay": "0s",

1796

"approval_duration": "1s",

1797

}

1798

client_config = configparser.SafeConfigParser(client_defaults)

2478

1799

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

2479

1800

"clients.conf"))

2480

1801

2481

1802

global mandos_dbus_service

2482

1803

mandos_dbus_service = None

2483

1804

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

1805

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

1806

server_settings["port"]),

1807

ClientHandler,

1808

interface=(server_settings["interface"]

1809

or None),

1810

use_ipv6=use_ipv6,

1811

gnutls_priority=

1812

server_settings["priority"],

1813

use_dbus=use_dbus)

1814

if not debug:

1815

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

2500

1816

try:

2501

1817

pidfile = open(pidfilename, "w")

2502

except IOError as e:

2503

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

2504

exc_info=e)

1818

except IOError:

1819

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

2505

1820

2506

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

1821

try:

1822

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

1823

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

1824

except KeyError:

2507

1825

try:

2508

uid = pwd.getpwnam(name).pw_uid

2509

gid = pwd.getpwnam(name).pw_gid

2510

break

1826

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

1827

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

2511

1828

except KeyError:

2512

continue

2513

else:

2514

uid = 65534

2515

gid = 65534

1829

try:

1830

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

1831

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

1832

except KeyError:

1833

uid = 65534

1834

gid = 65534

2516

1835

try:

2517

1836

os.setgid(gid)

2518

1837

os.setuid(uid)

2519

1838

except OSError as error:

2520

if error.errno != errno.EPERM:

2521

raise

1839

if error[0] != errno.EPERM:

1840

raise error

2522

1841

1842

if not debug and not debuglevel:

1843

syslogger.setLevel(logging.WARNING)

1844

console.setLevel(logging.WARNING)

1845

if debuglevel:

1846

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

1847

syslogger.setLevel(level)

1848

console.setLevel(level)

1849

2523

1850

if debug:

2524

1851

# Enable all possible GnuTLS debugging

2525

1852

2531

1858

def debug_gnutls(level, string):

2532

1859

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

2533

1860

2534

gnutls.library.functions.gnutls_global_set_log_function(

2535

debug_gnutls)

1861

(gnutls.library.functions

1862

.gnutls_global_set_log_function(debug_gnutls))

2536

1863

2537

1864

# Redirect stdin so all checkers get /dev/null

2538

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

1865

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

2539

1866

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

2540

1867

if null > 2:

2541

1868

os.close(null)

1869

else:

1870

# No console logging

1871

logger.removeHandler(console)

2542

1872

2543

1873

# Need to fork before connecting to D-Bus

2544

if not foreground:

1874

if not debug:

2545

1875

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

2546

1876

daemon()

2547

1877

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

1878

global main_loop

2553

1879

# From the Avahi example code

2554

DBusGMainLoop(set_as_default=True)

1880

DBusGMainLoop(set_as_default=True )

2555

1881

main_loop = gobject.MainLoop()

2556

1882

bus = dbus.SystemBus()

2557

1883

# End of Avahi example code

2558

1884

if use_dbus:

2559

1885

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)

1886

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

1887

bus, do_not_queue=True)

2566

1888

except dbus.exceptions.NameExistsException as e:

2567

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

1889

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

2568

1890

use_dbus = False

2569

1891

server_settings["use_dbus"] = False

2570

1892

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"))

1893

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1894

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

1895

servicetype = "_mandos._tcp",

1896

protocol = protocol, bus = bus)

1897

if server_settings["interface"]:

1898

service.interface = (if_nametoindex

1899

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

2581

1900

2582

1901

global multiprocessing_manager

2583

1902

multiprocessing_manager = multiprocessing.Manager()

2585

1904

client_class = Client

2586

1905

if use_dbus:

2587

1906

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))

1907

def client_config_items(config, section):

1908

special_settings = {

1909

"approved_by_default":

1910

lambda: config.getboolean(section,

1911

"approved_by_default"),

1912

}

1913

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

2672

1914

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

1915

yield (name, special_settings[name]())

1916

except KeyError:

1917

yield (name, value)

1918

1919

tcp_server.clients.update(set(

1920

client_class(name = section,

1921

config= dict(client_config_items(

1922

client_config, section)))

1923

for section in client_config.sections()))

2698

1924

if not tcp_server.clients:

2699

1925

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

1926

1927

if not debug:

1928

try:

1929

with pidfile:

1930

pid = os.getpid()

1931

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

1932

del pidfile

1933

except IOError:

1934

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

1935

pidfilename, pid)

1936

except NameError:

1937

# "pidfile" was never created

1938

pass

2711

1939

del pidfilename

2712

1940

1941

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

1942

2713

1943

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

2714

1944

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

2715

1945

2716

1946

if use_dbus:

2717

2718

@alternate_dbus_interfaces(

2719

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

2720

class MandosDBusService(DBusObjectWithProperties):

1947

class MandosDBusService(dbus.service.Object):

2721

1948

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

2722

2723

1949

def __init__(self):

2724

1950

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" }

1951

_interface = "se.bsnet.fukt.Mandos"

2733

1952

2734

1953

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

2735

1954

def ClientAdded(self, objpath):

2749

1968

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

2750

1969

def GetAllClients(self):

2751

1970

"D-Bus method"

2752

return dbus.Array(c.dbus_object_path for c in

2753

tcp_server.clients.itervalues())

1971

return dbus.Array(c.dbus_object_path

1972

for c in tcp_server.clients)

2754

1973

2755

1974

@dbus.service.method(_interface,

2756

1975

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

2757

1976

def GetAllClientsWithProperties(self):

2758

1977

"D-Bus method"

2759

1978

return dbus.Dictionary(

2760

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

2761

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

1979

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

1980

for c in tcp_server.clients),

2762

1981

signature="oa{sv}")

2763

1982

2764

1983

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

2765

1984

def RemoveClient(self, object_path):

2766

1985

"D-Bus method"

2767

for c in tcp_server.clients.itervalues():

1986

for c in tcp_server.clients:

2768

1987

if c.dbus_object_path == object_path:

2769

del tcp_server.clients[c.name]

1988

tcp_server.clients.remove(c)

2770

1989

c.remove_from_connection()

2771

1990

# Don't signal anything except ClientRemoved

2772

1991

c.disable(quiet=True)

2781

2000

2782

2001

def cleanup():

2783

2002

"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

2003

service.cleanup()

2004

2845

2005

while tcp_server.clients:

2846

name, client = tcp_server.clients.popitem()

2006

client = tcp_server.clients.pop()

2847

2007

if use_dbus:

2848

2008

client.remove_from_connection()

2009

client.disable_hook = None

2849

2010

# Don't signal anything except ClientRemoved

2850

2011

client.disable(quiet=True)

2851

2012

if use_dbus:

2852

2013

# Emit D-Bus signal

2853

mandos_dbus_service.ClientRemoved(

2854

client.dbus_object_path, client.name)

2855

client_settings.clear()

2014

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2015

client.name)

2856

2016

2857

2017

atexit.register(cleanup)

2858

2018

2859

for client in tcp_server.clients.itervalues():

2019

for client in tcp_server.clients:

2860

2020

if use_dbus:

2861

2021

# Emit D-Bus signal

2862

2022

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2863

# Need to initiate checking of clients

2864

if client.enabled:

2865

client.init_checker()

2023

client.enable()

2866

2024

2867

2025

tcp_server.enable()

2868

2026

tcp_server.server_activate()

2869

2027

2870

2028

# Find out what port we got

2871

if zeroconf:

2872

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

2029

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

2873

2030

if use_ipv6:

2874

2031

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

2875

" flowinfo %d, scope_id %d",

2876

*tcp_server.socket.getsockname())

2032

" flowinfo %d, scope_id %d"

2033

% tcp_server.socket.getsockname())

2877

2034

else: # IPv4

2878

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

2879

*tcp_server.socket.getsockname())

2035

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

2036

% tcp_server.socket.getsockname())

2880

2037

2881

2038

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

2882

2039

2883

2040

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

2041

# From the Avahi example code

2042

try:

2043

service.activate()

2044

except dbus.exceptions.DBusException as error:

2045

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

2046

cleanup()

2047

sys.exit(1)

2048

# End of Avahi example code

2893

2049

2894

2050

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

2895

2051

lambda *args, **kwargs:

2899

2055

logger.debug("Starting main loop")

2900

2056

main_loop.run()

2901

2057

except AvahiError as error:

2902

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

2058

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

2903

2059

cleanup()

2904

2060

sys.exit(1)

2905

2061

except KeyboardInterrupt:

2910

2066

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

2911

2067

cleanup()

2912

2068

2913

2914

2069

if __name__ == '__main__':

2915

2070

main()