/mandos/trunk : revision 502.1.1

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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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version = "1.6.8"

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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"))

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(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 =

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logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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version = "1.3.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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self.value = value

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

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**kwargs)

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

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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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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" 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 = unicode(self.server

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.GetAlternativeServiceName(self.name))

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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"""Add the new name to the syslog messages"""

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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return ret

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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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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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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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 timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return _timedelta_to_milliseconds(self.approval_delay)

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def __init__(self, name = None, 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

346

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

350

(config["secfile"])),

351

"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", "")

357

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.extended_timeout = string_to_delta(config["extended_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

537

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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self.expires = 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

375

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

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True)

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self.approvals_pending = 0

543

self.changedstate = (multiprocessing_manager

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.Condition(multiprocessing_manager

545

.Lock()))

546

self.client_structure = [attr for attr in

547

self.__dict__.iterkeys()

548

if not attr.startswith("_")]

549

self.client_structure.append("client_structure")

550

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

552

lambda obj:

553

isinstance(obj,

554

property)):

555

if not name.startswith("_"):

556

self.client_structure.append(name)

378

self.approval_delay = string_to_delta(

379

config["approval_delay"])

380

self.approval_duration = string_to_delta(

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config["approval_duration"])

382

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

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# Send notice to process children that client state has changed

559

384

def send_changedstate(self):

560

with self.changedstate:

561

self.changedstate.notify_all()

562

385

self.changedstate.acquire()

386

self.changedstate.notify_all()

387

self.changedstate.release()

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def enable(self):

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390

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

565

391

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

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# Already enabled

567

393

return

394

self.send_changedstate()

395

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

396

# and every interval from then on.

397

self.checker_initiator_tag = (gobject.timeout_add

398

(self.interval_milliseconds(),

399

self.start_checker))

400

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

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

402

self.disable_initiator_tag = (gobject.timeout_add

403

(self.timeout_milliseconds(),

404

self.disable))

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self.enabled = True

570

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self.last_enabled = datetime.datetime.utcnow()

571

self.init_checker()

572

self.send_changedstate()

407

# Also start a new checker *right now*.

408

self.start_checker()

573

409

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def disable(self, quiet=True):

575

411

"""Disable this client."""

576

412

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

577

413

return False

578

414

if not quiet:

415

self.send_changedstate()

416

if not quiet:

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417

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

580

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

418

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

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419

gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

584

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

422

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

585

423

gobject.source_remove(self.checker_initiator_tag)

586

424

self.checker_initiator_tag = None

587

425

self.stop_checker()

426

if self.disable_hook:

427

self.disable_hook(self)

588

428

self.enabled = False

589

if not quiet:

590

self.send_changedstate()

591

429

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

592

430

return False

593

431

594

432

def __del__(self):

433

self.disable_hook = None

595

434

self.disable()

596

435

597

def init_checker(self):

598

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

599

# and every interval from then on.

600

if self.checker_initiator_tag is not None:

601

gobject.source_remove(self.checker_initiator_tag)

602

self.checker_initiator_tag = (gobject.timeout_add

603

(int(self.interval

604

.total_seconds() * 1000),

605

self.start_checker))

606

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

607

if self.disable_initiator_tag is not None:

608

gobject.source_remove(self.disable_initiator_tag)

609

self.disable_initiator_tag = (gobject.timeout_add

610

(int(self.timeout

611

.total_seconds() * 1000),

612

self.disable))

613

# Also start a new checker *right now*.

614

self.start_checker()

615

616

436

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

617

437

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

618

438

self.checker_callback_tag = None

619

439

self.checker = None

620

440

if os.WIFEXITED(condition):

621

self.last_checker_status = os.WEXITSTATUS(condition)

622

if self.last_checker_status == 0:

441

exitstatus = os.WEXITSTATUS(condition)

442

if exitstatus == 0:

623

443

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

624

444

vars(self))

625

445

self.checked_ok()

627

447

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

628

448

vars(self))

629

449

else:

630

self.last_checker_status = -1

631

450

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

632

451

vars(self))

633

452

634

def checked_ok(self):

635

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

636

self.last_checked_ok = datetime.datetime.utcnow()

637

self.last_checker_status = 0

638

self.bump_timeout()

639

640

def bump_timeout(self, timeout=None):

641

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

453

def checked_ok(self, timeout=None):

454

"""Bump up the timeout for this client.

455

456

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

457

alive and well.

458

"""

642

459

if timeout is None:

643

460

timeout = self.timeout

644

if self.disable_initiator_tag is not None:

645

gobject.source_remove(self.disable_initiator_tag)

646

self.disable_initiator_tag = None

647

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

648

self.disable_initiator_tag = (gobject.timeout_add

649

(int(timeout.total_seconds()

650

* 1000), self.disable))

651

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

461

self.last_checked_ok = datetime.datetime.utcnow()

462

gobject.source_remove(self.disable_initiator_tag)

463

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

464

self.disable_initiator_tag = (gobject.timeout_add

465

(_timedelta_to_milliseconds(timeout),

466

self.disable))

652

467

653

468

def need_approval(self):

654

469

self.last_approval_request = datetime.datetime.utcnow()

659

474

If a checker already exists, leave it running and do

660

475

nothing."""

661

476

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

662

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

663

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

664

# would inevitably timeout, since no checker would get a

665

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

477

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

478

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

479

# client would inevitably timeout, since no checker would get

480

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

666

481

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

667

482

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

668

483

# should be.

670

485

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

671

486

try:

672

487

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

673

except AttributeError:

674

pass

675

except OSError as error:

676

if error.errno != errno.ECHILD:

677

raise

488

except (AttributeError, OSError) as error:

489

if (isinstance(error, OSError)

490

and error.errno != errno.ECHILD):

491

raise error

678

492

else:

679

493

if pid:

680

494

logger.warning("Checker was a zombie")

683

497

self.current_checker_command)

684

498

# Start a new checker if needed

685

499

if self.checker is None:

686

# Escape attributes for the shell

687

escaped_attrs = { attr:

688

re.escape(unicode(getattr(self,

689

attr)))

690

for attr in self.runtime_expansions }

691

500

try:

692

command = self.checker_command % escaped_attrs

693

except TypeError as error:

694

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

695

self.checker_command, exc_info=error)

696

return True # Try again later

501

# In case checker_command has exactly one % operator

502

command = self.checker_command % self.host

503

except TypeError:

504

# Escape attributes for the shell

505

escaped_attrs = dict(

506

(attr,

507

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

508

errors=

509

'replace')))

510

for attr in

511

self.runtime_expansions)

512

513

try:

514

command = self.checker_command % escaped_attrs

515

except TypeError as error:

516

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

517

' %s', self.checker_command, error)

518

return True # Try again later

697

519

self.current_checker_command = command

698

520

try:

699

521

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

702

524

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

703

525

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

704

526

# always replaced by /dev/null.)

705

# The exception is when not debugging but nevertheless

706

# running in the foreground; use the previously

707

# created wnull.

708

popen_args = {}

709

if (not self.server_settings["debug"]

710

and self.server_settings["foreground"]):

711

popen_args.update({"stdout": wnull,

712

"stderr": wnull })

713

527

self.checker = subprocess.Popen(command,

714

528

close_fds=True,

715

shell=True, cwd="/",

716

**popen_args)

717

except OSError as error:

718

logger.error("Failed to start subprocess",

719

exc_info=error)

720

return True

721

self.checker_callback_tag = (gobject.child_watch_add

722

(self.checker.pid,

723

self.checker_callback,

724

data=command))

725

# The checker may have completed before the gobject

726

# watch was added. Check for this.

727

try:

529

shell=True, cwd="/")

530

self.checker_callback_tag = (gobject.child_watch_add

531

(self.checker.pid,

532

self.checker_callback,

533

data=command))

534

# The checker may have completed before the gobject

535

# watch was added. Check for this.

728

536

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

537

if pid:

538

gobject.source_remove(self.checker_callback_tag)

539

self.checker_callback(pid, status, command)

729

540

except OSError as error:

730

if error.errno == errno.ECHILD:

731

# This should never happen

732

logger.error("Child process vanished",

733

exc_info=error)

734

return True

735

raise

736

if pid:

737

gobject.source_remove(self.checker_callback_tag)

738

self.checker_callback(pid, status, command)

541

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

542

error)

739

543

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

740

544

return True

741

545

748

552

return

749

553

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

750

554

try:

751

self.checker.terminate()

555

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

752

556

#time.sleep(0.5)

753

557

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

754

# self.checker.kill()

558

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

755

559

except OSError as error:

756

560

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

757

561

raise

774

578

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

775

579

if byte_arrays and signature != "ay":

776

580

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

777

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

581

" signature %r" % signature)

778

582

def decorator(func):

779

583

func._dbus_is_property = True

780

584

func._dbus_interface = dbus_interface

788

592

return decorator

789

593

790

594

791

def dbus_interface_annotations(dbus_interface):

792

"""Decorator for marking functions returning interface annotations

793

794

Usage:

795

796

@dbus_interface_annotations("org.example.Interface")

797

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

798

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

799

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

800

"false"}

801

"""

802

def decorator(func):

803

func._dbus_is_interface = True

804

func._dbus_interface = dbus_interface

805

func._dbus_name = dbus_interface

806

return func

807

return decorator

808

809

810

def dbus_annotations(annotations):

811

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

812

Usage:

813

814

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

815

access="r")

816

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

817

"org.freedesktop.DBus.Property."

818

"EmitsChangedSignal": "false"})

819

def Property_dbus_property(self):

820

return dbus.Boolean(False)

821

"""

822

def decorator(func):

823

func._dbus_annotations = annotations

824

return func

825

return decorator

826

827

828

595

class DBusPropertyException(dbus.exceptions.DBusException):

829

596

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

830

597

"""

831

pass

598

def __unicode__(self):

599

return unicode(str(self))

600

832

601

833

602

class DBusPropertyAccessException(DBusPropertyException):

834

603

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

851

620

"""

852

621

853

622

@staticmethod

854

def _is_dbus_thing(thing):

855

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

856

857

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

858

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

859

"""

860

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

861

False)

623

def _is_dbus_property(obj):

624

return getattr(obj, "_dbus_is_property", False)

862

625

863

def _get_all_dbus_things(self, thing):

626

def _get_all_dbus_properties(self):

864

627

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

865

628

"""

866

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

867

name),

868

athing.__get__(self))

869

for cls in self.__class__.__mro__

870

for name, athing in

871

inspect.getmembers(cls,

872

self._is_dbus_thing(thing)))

629

return ((prop._dbus_name, prop)

630

for name, prop in

631

inspect.getmembers(self, self._is_dbus_property))

873

632

874

633

def _get_dbus_property(self, interface_name, property_name):

875

634

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

876

635

property with the specified name and interface.

877

636

"""

878

for cls in self.__class__.__mro__:

879

for name, value in (inspect.getmembers

880

(cls,

881

self._is_dbus_thing("property"))):

882

if (value._dbus_name == property_name

883

and value._dbus_interface == interface_name):

884

return value.__get__(self)

885

637

for name in (property_name,

638

property_name + "_dbus_property"):

639

prop = getattr(self, name, None)

640

if (prop is None

641

or not self._is_dbus_property(prop)

642

or prop._dbus_name != property_name

643

or (interface_name and prop._dbus_interface

644

and interface_name != prop._dbus_interface)):

645

continue

646

return prop

886

647

# No such property

887

648

raise DBusPropertyNotFound(self.dbus_object_path + ":"

888

649

+ interface_name + "."

912

673

# The byte_arrays option is not supported yet on

913

674

# signatures other than "ay".

914

675

if prop._dbus_signature != "ay":

915

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

916

"'ay' signature {!r}"

917

.format(prop._dbus_signature))

918

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

919

for byte in value))

676

raise ValueError

677

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

678

for byte in value))

920

679

prop(value)

921

680

922

681

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

927

686

928

687

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

929

688

"""

930

properties = {}

931

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

689

all = {}

690

for name, prop in self._get_all_dbus_properties():

932

691

if (interface_name

933

692

and interface_name != prop._dbus_interface):

934

693

# Interface non-empty but did not match

938

697

continue

939

698

value = prop()

940

699

if not hasattr(value, "variant_level"):

941

properties[name] = value

700

all[name] = value

942

701

continue

943

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

944

value.variant_level+1)

945

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

702

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

703

value.variant_level+1)

704

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

946

705

947

706

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

948

707

out_signature="s",

949

708

path_keyword='object_path',

950

709

connection_keyword='connection')

951

710

def Introspect(self, object_path, connection):

952

"""Overloading of standard D-Bus method.

953

954

Inserts property tags and interface annotation tags.

711

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

955

712

"""

956

713

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

957

714

connection)

964

721

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

965

722

return e

966

723

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

967

# Add property tags

968

724

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

969

725

for name, prop

970

in self._get_all_dbus_things("property")

726

in self._get_all_dbus_properties()

971

727

if prop._dbus_interface

972

728

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

973

729

if_tag.appendChild(tag)

974

# Add annotation tags

975

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

976

for tag in if_tag.getElementsByTagName(typ):

977

annots = dict()

978

for name, prop in (self.

979

_get_all_dbus_things(typ)):

980

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

981

and prop._dbus_interface

982

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

983

annots.update(getattr

984

(prop,

985

"_dbus_annotations",

986

{}))

987

for name, value in annots.items():

988

ann_tag = document.createElement(

989

"annotation")

990

ann_tag.setAttribute("name", name)

991

ann_tag.setAttribute("value", value)

992

tag.appendChild(ann_tag)

993

# Add interface annotation tags

994

for annotation, value in dict(

995

itertools.chain.from_iterable(

996

annotations().items()

997

for name, annotations in

998

self._get_all_dbus_things("interface")

999

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

1000

)).items():

1001

ann_tag = document.createElement("annotation")

1002

ann_tag.setAttribute("name", annotation)

1003

ann_tag.setAttribute("value", value)

1004

if_tag.appendChild(ann_tag)

1005

730

# Add the names to the return values for the

1006

731

# "org.freedesktop.DBus.Properties" methods

1007

732

if (if_tag.getAttribute("name")

1022

747

except (AttributeError, xml.dom.DOMException,

1023

748

xml.parsers.expat.ExpatError) as error:

1024

749

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

1025

exc_info=error)

750

error)

1026

751

return xmlstring

1027

752

1028

753

1029

def datetime_to_dbus(dt, variant_level=0):

754

def datetime_to_dbus (dt, variant_level=0):

1030

755

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

1031

756

if dt is None:

1032

757

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

1034

759

variant_level=variant_level)

1035

760

1036

761

1037

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1038

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

1039

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

1040

interface names according to the "alt_interface_names" mapping.

1041

Usage:

1042

1043

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

1044

"net.example.AlternateInterface"})

1045

class SampleDBusObject(dbus.service.Object):

1046

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

1047

def SampleDBusMethod():

1048

pass

1049

1050

The above "SampleDBusMethod" on "SampleDBusObject" will be

1051

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

1052

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

1053

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

1054

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

1055

1056

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

1057

(from DBusObjectWithProperties) and interfaces (from the

1058

dbus_interface_annotations decorator).

1059

"""

1060

def wrapper(cls):

1061

for orig_interface_name, alt_interface_name in (

1062

alt_interface_names.items()):

1063

attr = {}

1064

interface_names = set()

1065

# Go though all attributes of the class

1066

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

1067

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

1068

# with the wrong interface name

1069

if (not hasattr(attribute, "_dbus_interface")

1070

or not attribute._dbus_interface

1071

.startswith(orig_interface_name)):

1072

continue

1073

# Create an alternate D-Bus interface name based on

1074

# the current name

1075

alt_interface = (attribute._dbus_interface

1076

.replace(orig_interface_name,

1077

alt_interface_name))

1078

interface_names.add(alt_interface)

1079

# Is this a D-Bus signal?

1080

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

1081

# Extract the original non-method undecorated

1082

# function by black magic

1083

nonmethod_func = (dict(

1084

zip(attribute.func_code.co_freevars,

1085

attribute.__closure__))["func"]

1086

.cell_contents)

1087

# Create a new, but exactly alike, function

1088

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

1089

# with the alternate D-Bus interface name

1090

new_function = (dbus.service.signal

1091

(alt_interface,

1092

attribute._dbus_signature)

1093

(types.FunctionType(

1094

nonmethod_func.func_code,

1095

nonmethod_func.func_globals,

1096

nonmethod_func.func_name,

1097

nonmethod_func.func_defaults,

1098

nonmethod_func.func_closure)))

1099

# Copy annotations, if any

1100

try:

1101

new_function._dbus_annotations = (

1102

dict(attribute._dbus_annotations))

1103

except AttributeError:

1104

pass

1105

# Define a creator of a function to call both the

1106

# original and alternate functions, so both the

1107

# original and alternate signals gets sent when

1108

# the function is called

1109

def fixscope(func1, func2):

1110

"""This function is a scope container to pass

1111

func1 and func2 to the "call_both" function

1112

outside of its arguments"""

1113

def call_both(*args, **kwargs):

1114

"""This function will emit two D-Bus

1115

signals by calling func1 and func2"""

1116

func1(*args, **kwargs)

1117

func2(*args, **kwargs)

1118

return call_both

1119

# Create the "call_both" function and add it to

1120

# the class

1121

attr[attrname] = fixscope(attribute, new_function)

1122

# Is this a D-Bus method?

1123

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

1124

# Create a new, but exactly alike, function

1125

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

1126

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

1127

# to the class.

1128

attr[attrname] = (dbus.service.method

1129

(alt_interface,

1130

attribute._dbus_in_signature,

1131

attribute._dbus_out_signature)

1132

(types.FunctionType

1133

(attribute.func_code,

1134

attribute.func_globals,

1135

attribute.func_name,

1136

attribute.func_defaults,

1137

attribute.func_closure)))

1138

# Copy annotations, if any

1139

try:

1140

attr[attrname]._dbus_annotations = (

1141

dict(attribute._dbus_annotations))

1142

except AttributeError:

1143

pass

1144

# Is this a D-Bus property?

1145

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

1146

# Create a new, but exactly alike, function

1147

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

1148

# property with the alternate D-Bus interface

1149

# name. Add it to the class.

1150

attr[attrname] = (dbus_service_property

1151

(alt_interface,

1152

attribute._dbus_signature,

1153

attribute._dbus_access,

1154

attribute

1155

._dbus_get_args_options

1156

["byte_arrays"])

1157

(types.FunctionType

1158

(attribute.func_code,

1159

attribute.func_globals,

1160

attribute.func_name,

1161

attribute.func_defaults,

1162

attribute.func_closure)))

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1169

# Is this a D-Bus interface?

1170

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

1171

# Create a new, but exactly alike, function

1172

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

1173

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

1174

# to the class.

1175

attr[attrname] = (dbus_interface_annotations

1176

(alt_interface)

1177

(types.FunctionType

1178

(attribute.func_code,

1179

attribute.func_globals,

1180

attribute.func_name,

1181

attribute.func_defaults,

1182

attribute.func_closure)))

1183

if deprecate:

1184

# Deprecate all alternate interfaces

1185

iname="_AlternateDBusNames_interface_annotation{}"

1186

for interface_name in interface_names:

1187

@dbus_interface_annotations(interface_name)

1188

def func(self):

1189

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

1190

"true" }

1191

# Find an unused name

1192

for aname in (iname.format(i)

1193

for i in itertools.count()):

1194

if aname not in attr:

1195

attr[aname] = func

1196

break

1197

if interface_names:

1198

# Replace the class with a new subclass of it with

1199

# methods, signals, etc. as created above.

1200

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

1201

(cls,), attr)

1202

return cls

1203

return wrapper

1204

1205

1206

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

1207

"se.bsnet.fukt.Mandos"})

1208

762

class ClientDBus(Client, DBusObjectWithProperties):

1209

763

"""A Client class using D-Bus

1210

764

1219

773

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

1220

774

1221

775

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

776

self._approvals_pending = 0

1222

777

self.bus = bus

1223

778

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

1224

779

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

1230

785

("/clients/" + client_object_name))

1231

786

DBusObjectWithProperties.__init__(self, self.bus,

1232

787

self.dbus_object_path)

1233

788

1234

789

def notifychangeproperty(transform_func,

1235

790

dbus_name, type_func=lambda x: x,

1236

791

variant_level=1):

1237

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

1238

its changes to DBus.

1239

1240

transform_fun: Function that takes a value and a variant_level

1241

and transforms it to a D-Bus type.

1242

dbus_name: D-Bus name of the variable

792

""" Modify a variable so that its a property that announce its

793

changes to DBus.

794

transform_fun: Function that takes a value and transform it to

795

DBus type.

796

dbus_name: DBus name of the variable

1243

797

type_func: Function that transform the value before sending it

1244

to the D-Bus. Default: no transform

1245

variant_level: D-Bus variant level. Default: 1

798

to DBus

799

variant_level: DBus variant level. default: 1

1246

800

"""

1247

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

801

real_value = [None,]

1248

802

def setter(self, value):

803

old_value = real_value[0]

804

real_value[0] = value

1249

805

if hasattr(self, "dbus_object_path"):

1250

if (not hasattr(self, attrname) or

1251

type_func(getattr(self, attrname, None))

1252

!= type_func(value)):

1253

dbus_value = transform_func(type_func(value),

1254

variant_level

1255

=variant_level)

806

if type_func(old_value) != type_func(real_value[0]):

807

dbus_value = transform_func(type_func(real_value[0]),

808

variant_level)

1256

809

self.PropertyChanged(dbus.String(dbus_name),

1257

810

dbus_value)

1258

setattr(self, attrname, value)

1259

811

1260

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

812

return property(lambda self: real_value[0], setter)

813

1261

814

1262

815

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1263

816

approvals_pending = notifychangeproperty(dbus.Boolean,

1267

820

last_enabled = notifychangeproperty(datetime_to_dbus,

1268

821

"LastEnabled")

1269

822

checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",

1270

type_func = lambda checker:

1271

checker is not None)

823

type_func = lambda checker: checker is not None)

1272

824

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1273

825

"LastCheckedOK")

1274

last_checker_status = notifychangeproperty(dbus.Int16,

1275

"LastCheckerStatus")

1276

last_approval_request = notifychangeproperty(

1277

datetime_to_dbus, "LastApprovalRequest")

826

last_approval_request = notifychangeproperty(datetime_to_dbus,

827

"LastApprovalRequest")

1278

828

approved_by_default = notifychangeproperty(dbus.Boolean,

1279

829

"ApprovedByDefault")

1280

approval_delay = notifychangeproperty(dbus.UInt64,

1281

"ApprovalDelay",

1282

type_func =

1283

lambda td: td.total_seconds()

1284

* 1000)

1285

approval_duration = notifychangeproperty(

1286

dbus.UInt64, "ApprovalDuration",

1287

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

830

approval_delay = notifychangeproperty(dbus.UInt16, "ApprovalDelay",

831

type_func = _timedelta_to_milliseconds)

832

approval_duration = notifychangeproperty(dbus.UInt16, "ApprovalDuration",

833

type_func = _timedelta_to_milliseconds)

1288

834

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

1289

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

1290

type_func = lambda td:

1291

td.total_seconds() * 1000)

1292

extended_timeout = notifychangeproperty(

1293

dbus.UInt64, "ExtendedTimeout",

1294

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

1295

interval = notifychangeproperty(dbus.UInt64,

1296

"Interval",

1297

type_func =

1298

lambda td: td.total_seconds()

1299

* 1000)

835

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

836

type_func = _timedelta_to_milliseconds)

837

extended_timeout = notifychangeproperty(dbus.UInt16, "ExtendedTimeout",

838

type_func = _timedelta_to_milliseconds)

839

interval = notifychangeproperty(dbus.UInt16, "Interval",

840

type_func = _timedelta_to_milliseconds)

1300

841

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

1301

842

1302

843

del notifychangeproperty

1330

871

*args, **kwargs)

1331

872

1332

873

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

1333

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

874

old_checker = self.checker

875

if self.checker is not None:

876

old_checker_pid = self.checker.pid

877

else:

878

old_checker_pid = None

1334

879

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

1335

880

# Only if new checker process was started

1336

881

if (self.checker is not None

1340

885

return r

1341

886

1342

887

def _reset_approved(self):

1343

self.approved = None

888

self._approved = None

1344

889

return False

1345

890

1346

891

def approve(self, value=True):

1347

self.approved = value

1348

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

1349

* 1000), self._reset_approved)

1350

892

self.send_changedstate()

893

self._approved = value

894

gobject.timeout_add(_timedelta_to_milliseconds

895

(self.approval_duration),

896

self._reset_approved)

897

1351

898

1352

899

## D-Bus methods, signals & properties

1353

_interface = "se.recompile.Mandos.Client"

1354

1355

## Interfaces

1356

1357

@dbus_interface_annotations(_interface)

1358

def _foo(self):

1359

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

1360

"false"}

900

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

1361

901

1362

902

## Signals

1363

903

1455

995

access="readwrite")

1456

996

def ApprovalDelay_dbus_property(self, value=None):

1457

997

if value is None: # get

1458

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

1459

* 1000)

998

return dbus.UInt64(self.approval_delay_milliseconds())

1460

999

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

1461

1000

1462

1001

# ApprovalDuration - property

1464

1003

access="readwrite")

1465

1004

def ApprovalDuration_dbus_property(self, value=None):

1466

1005

if value is None: # get

1467

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

1468

* 1000)

1006

return dbus.UInt64(_timedelta_to_milliseconds(

1007

self.approval_duration))

1469

1008

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

1470

1009

1471

1010

# Name - property

1484

1023

def Host_dbus_property(self, value=None):

1485

1024

if value is None: # get

1486

1025

return dbus.String(self.host)

1487

self.host = unicode(value)

1026

self.host = value

1488

1027

1489

1028

# Created - property

1490

1029

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

1491

1030

def Created_dbus_property(self):

1492

return datetime_to_dbus(self.created)

1031

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

1493

1032

1494

1033

# LastEnabled - property

1495

1034

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

1516

1055

return

1517

1056

return datetime_to_dbus(self.last_checked_ok)

1518

1057

1519

# LastCheckerStatus - property

1520

@dbus_service_property(_interface, signature="n",

1521

access="read")

1522

def LastCheckerStatus_dbus_property(self):

1523

return dbus.Int16(self.last_checker_status)

1524

1525

1058

# Expires - property

1526

1059

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

1527

1060

def Expires_dbus_property(self):

1537

1070

access="readwrite")

1538

1071

def Timeout_dbus_property(self, value=None):

1539

1072

if value is None: # get

1540

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

1541

old_timeout = self.timeout

1073

return dbus.UInt64(self.timeout_milliseconds())

1542

1074

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

1543

# Reschedule disabling

1544

if self.enabled:

1545

now = datetime.datetime.utcnow()

1546

self.expires += self.timeout - old_timeout

1547

if self.expires <= now:

1548

# The timeout has passed

1549

self.disable()

1550

else:

1551

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

1552

is None):

1553

return

1554

gobject.source_remove(self.disable_initiator_tag)

1555

self.disable_initiator_tag = (

1556

gobject.timeout_add(

1557

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

1558

* 1000), self.disable))

1075

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

1076

return

1077

# Reschedule timeout

1078

gobject.source_remove(self.disable_initiator_tag)

1079

self.disable_initiator_tag = None

1080

self.expires = None

1081

time_to_die = (self.

1082

_timedelta_to_milliseconds((self

1083

.last_checked_ok

1084

+ self.timeout)

1085

- datetime.datetime

1086

.utcnow()))

1087

if time_to_die <= 0:

1088

# The timeout has passed

1089

self.disable()

1090

else:

1091

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

1092

+ datetime.timedelta(milliseconds = time_to_die))

1093

self.disable_initiator_tag = (gobject.timeout_add

1094

(time_to_die, self.disable))

1559

1095

1560

1096

# ExtendedTimeout - property

1561

1097

@dbus_service_property(_interface, signature="t",

1562

1098

access="readwrite")

1563

1099

def ExtendedTimeout_dbus_property(self, value=None):

1564

1100

if value is None: # get

1565

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

1566

* 1000)

1101

return dbus.UInt64(self.extended_timeout_milliseconds())

1567

1102

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

1568

1103

1569

1104

# Interval - property

1571

1106

access="readwrite")

1572

1107

def Interval_dbus_property(self, value=None):

1573

1108

if value is None: # get

1574

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

1109

return dbus.UInt64(self.interval_milliseconds())

1575

1110

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

1576

1111

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

1577

1112

return

1578

if self.enabled:

1579

# Reschedule checker run

1580

gobject.source_remove(self.checker_initiator_tag)

1581

self.checker_initiator_tag = (gobject.timeout_add

1582

(value, self.start_checker))

1583

self.start_checker() # Start one now, too

1113

# Reschedule checker run

1114

gobject.source_remove(self.checker_initiator_tag)

1115

self.checker_initiator_tag = (gobject.timeout_add

1116

(value, self.start_checker))

1117

self.start_checker() # Start one now, too

1584

1118

1585

1119

# Checker - property

1586

1120

@dbus_service_property(_interface, signature="s",

1588

1122

def Checker_dbus_property(self, value=None):

1589

1123

if value is None: # get

1590

1124

return dbus.String(self.checker_command)

1591

self.checker_command = unicode(value)

1125

self.checker_command = value

1592

1126

1593

1127

# CheckerRunning - property

1594

1128

@dbus_service_property(_interface, signature="b",

1610

1144

@dbus_service_property(_interface, signature="ay",

1611

1145

access="write", byte_arrays=True)

1612

1146

def Secret_dbus_property(self, value):

1613

self.secret = bytes(value)

1147

self.secret = str(value)

1614

1148

1615

1149

del _interface

1616

1150

1623

1157

raise KeyError()

1624

1158

1625

1159

def __getattribute__(self, name):

1626

if name == '_pipe':

1160

if(name == '_pipe'):

1627

1161

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

1628

1162

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

1629

1163

data = self._pipe.recv()

1636

1170

return func

1637

1171

1638

1172

def __setattr__(self, name, value):

1639

if name == '_pipe':

1173

if(name == '_pipe'):

1640

1174

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

1641

1175

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

1642

1176

1682

1216

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

1683

1217

try:

1684

1218

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

1685

raise RuntimeError(line)

1219

raise RuntimeError

1686

1220

except (ValueError, IndexError, RuntimeError) as error:

1687

1221

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

1688

1222

return

1725

1259

client.name)

1726

1260

if self.server.use_dbus:

1727

1261

# Emit D-Bus signal

1728

client.Rejected("Disabled")

1262

client.Rejected("Disabled")

1729

1263

return

1730

1264

1731

if client.approved or not client.approval_delay:

1265

if client._approved or not client.approval_delay:

1732

1266

#We are approved or approval is disabled

1733

1267

break

1734

elif client.approved is None:

1268

elif client._approved is None:

1735

1269

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

1736

1270

client.name)

1737

1271

if self.server.use_dbus:

1738

1272

# Emit D-Bus signal

1739

1273

client.NeedApproval(

1740

client.approval_delay.total_seconds()

1741

* 1000, client.approved_by_default)

1274

client.approval_delay_milliseconds(),

1275

client.approved_by_default)

1742

1276

else:

1743

1277

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

1744

1278

client.name)

1748

1282

return

1749

1283

1750

1284

#wait until timeout or approved

1285

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

1751

1286

time = datetime.datetime.now()

1752

1287

client.changedstate.acquire()

1753

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

1288

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

1754

1289

client.changedstate.release()

1755

1290

time2 = datetime.datetime.now()

1756

1291

if (time2 - time) >= delay:

1772

1307

try:

1773

1308

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

1774

1309

except gnutls.errors.GNUTLSError as error:

1775

logger.warning("gnutls send failed",

1776

exc_info=error)

1310

logger.warning("gnutls send failed")

1777

1311

return

1778

1312

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

1779

1313

sent, len(client.secret)

1781

1315

sent_size += sent

1782

1316

1783

1317

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

1784

# bump the timeout using extended_timeout

1785

client.bump_timeout(client.extended_timeout)

1318

# bump the timeout as if seen

1319

client.checked_ok(client.extended_timeout)

1786

1320

if self.server.use_dbus:

1787

1321

# Emit D-Bus signal

1788

1322

client.GotSecret()

1793

1327

try:

1794

1328

session.bye()

1795

1329

except gnutls.errors.GNUTLSError as error:

1796

logger.warning("GnuTLS bye failed",

1797

exc_info=error)

1330

logger.warning("GnuTLS bye failed")

1798

1331

1799

1332

@staticmethod

1800

1333

def peer_certificate(session):

1856

1389

# Convert the buffer to a Python bytestring

1857

1390

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

1858

1391

# Convert the bytestring to hexadecimal notation

1859

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

1392

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

1860

1393

return hex_fpr

1861

1394

1862

1395

1865

1398

def sub_process_main(self, request, address):

1866

1399

try:

1867

1400

self.finish_request(request, address)

1868

except Exception:

1401

except:

1869

1402

self.handle_error(request, address)

1870

1403

self.close_request(request)

1871

1404

1872

1405

def process_request(self, request, address):

1873

1406

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

1874

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

1875

args = (request, address))

1876

proc.start()

1877

return proc

1407

multiprocessing.Process(target = self.sub_process_main,

1408

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

1878

1409

1879

1410

1880

1411

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1886

1417

"""

1887

1418

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1888

1419

1889

proc = MultiprocessingMixIn.process_request(self, request,

1890

client_address)

1420

super(MultiprocessingMixInWithPipe,

1421

self).process_request(request, client_address)

1891

1422

self.child_pipe.close()

1892

self.add_pipe(parent_pipe, proc)

1423

self.add_pipe(parent_pipe)

1893

1424

1894

def add_pipe(self, parent_pipe, proc):

1425

def add_pipe(self, parent_pipe):

1895

1426

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

1896

raise NotImplementedError()

1427

raise NotImplementedError

1897

1428

1898

1429

1899

1430

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1906

1437

use_ipv6: Boolean; to use IPv6 or not

1907

1438

"""

1908

1439

def __init__(self, server_address, RequestHandlerClass,

1909

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

1910

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

1911

creating a new one with socket.socket().

1912

"""

1440

interface=None, use_ipv6=True):

1913

1441

self.interface = interface

1914

1442

if use_ipv6:

1915

1443

self.address_family = socket.AF_INET6

1916

if socketfd is not None:

1917

# Save the file descriptor

1918

self.socketfd = socketfd

1919

# Save the original socket.socket() function

1920

self.socket_socket = socket.socket

1921

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

1922

#

1923

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

1924

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

1925

# patching socket.socket.)

1926

#

1927

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

1928

@functools.wraps(socket.socket)

1929

def socket_wrapper(*args, **kwargs):

1930

# Restore original function so subsequent calls are

1931

# not affected.

1932

socket.socket = self.socket_socket

1933

del self.socket_socket

1934

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

1935

# saved file descriptor.

1936

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

1937

# Replace socket.socket() function with wrapper

1938

socket.socket = socket_wrapper

1939

# The socketserver.TCPServer.__init__ will call

1940

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

1941

# socket_wrapper(), if socketfd was set.

1942

1444

socketserver.TCPServer.__init__(self, server_address,

1943

1445

RequestHandlerClass)

1944

1945

1446

def server_bind(self):

1946

1447

"""This overrides the normal server_bind() function

1947

1448

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

1955

1456

try:

1956

1457

self.socket.setsockopt(socket.SOL_SOCKET,

1957

1458

SO_BINDTODEVICE,

1958

(self.interface + "\0")

1959

.encode("utf-8"))

1459

str(self.interface

1460

+ '\0'))

1960

1461

except socket.error as error:

1961

if error.errno == errno.EPERM:

1962

logger.error("No permission to bind to"

1963

" interface %s", self.interface)

1964

elif error.errno == errno.ENOPROTOOPT:

1462

if error[0] == errno.EPERM:

1463

logger.error("No permission to"

1464

" bind to interface %s",

1465

self.interface)

1466

elif error[0] == errno.ENOPROTOOPT:

1965

1467

logger.error("SO_BINDTODEVICE not available;"

1966

1468

" cannot bind to interface %s",

1967

1469

self.interface)

1968

elif error.errno == errno.ENODEV:

1969

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

1970

" cannot bind", self.interface)

1971

1470

else:

1972

1471

raise

1973

1472

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

1976

1475

if self.address_family == socket.AF_INET6:

1977

1476

any_address = "::" # in6addr_any

1978

1477

else:

1979

any_address = "0.0.0.0" # INADDR_ANY

1478

any_address = socket.INADDR_ANY

1980

1479

self.server_address = (any_address,

1981

1480

self.server_address[1])

1982

1481

elif not self.server_address[1]:

2003

1502

"""

2004

1503

def __init__(self, server_address, RequestHandlerClass,

2005

1504

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

2006

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

1505

gnutls_priority=None, use_dbus=True):

2007

1506

self.enabled = False

2008

1507

self.clients = clients

2009

1508

if self.clients is None:

2010

self.clients = {}

1509

self.clients = set()

2011

1510

self.use_dbus = use_dbus

2012

1511

self.gnutls_priority = gnutls_priority

2013

1512

IPv6_TCPServer.__init__(self, server_address,

2014

1513

RequestHandlerClass,

2015

1514

interface = interface,

2016

use_ipv6 = use_ipv6,

2017

socketfd = socketfd)

1515

use_ipv6 = use_ipv6)

2018

1516

def server_activate(self):

2019

1517

if self.enabled:

2020

1518

return socketserver.TCPServer.server_activate(self)

2021

2022

1519

def enable(self):

2023

1520

self.enabled = True

2024

2025

def add_pipe(self, parent_pipe, proc):

1521

def add_pipe(self, parent_pipe):

2026

1522

# Call "handle_ipc" for both data and EOF events

2027

1523

gobject.io_add_watch(parent_pipe.fileno(),

2028

1524

gobject.IO_IN | gobject.IO_HUP,

2029

1525

functools.partial(self.handle_ipc,

2030

parent_pipe =

2031

parent_pipe,

2032

proc = proc))

2033

1526

parent_pipe = parent_pipe))

1527

2034

1528

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

2035

proc = None, client_object=None):

2036

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

2037

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

2038

# Wait for other process to exit

2039

proc.join()

1529

client_object=None):

1530

condition_names = {

1531

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

1532

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

1533

# blocking).

1534

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

1535

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

1536

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

1537

# broken, usually for pipes and

1538

# sockets).

1539

}

1540

conditions_string = ' | '.join(name

1541

for cond, name in

1542

condition_names.iteritems()

1543

if cond & condition)

1544

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

1545

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

2040

1546

return False

2041

1547

2042

1548

# Read a request from the child

2047

1553

fpr = request[1]

2048

1554

address = request[2]

2049

1555

2050

for c in self.clients.itervalues():

1556

for c in self.clients:

2051

1557

if c.fingerprint == fpr:

2052

1558

client = c

2053

1559

break

2056

1562

"dress: %s", fpr, address)

2057

1563

if self.use_dbus:

2058

1564

# Emit D-Bus signal

2059

mandos_dbus_service.ClientNotFound(fpr,

2060

address[0])

1565

mandos_dbus_service.ClientNotFound(fpr, address[0])

2061

1566

parent_pipe.send(False)

2062

1567

return False

2063

1568

2064

1569

gobject.io_add_watch(parent_pipe.fileno(),

2065

1570

gobject.IO_IN | gobject.IO_HUP,

2066

1571

functools.partial(self.handle_ipc,

2067

parent_pipe =

2068

parent_pipe,

2069

proc = proc,

2070

client_object =

2071

client))

1572

parent_pipe = parent_pipe,

1573

client_object = client))

2072

1574

parent_pipe.send(True)

2073

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

2074

# same fileno

1575

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

2075

1576

return False

2076

1577

if command == 'funcall':

2077

1578

funcname = request[1]

2078

1579

args = request[2]

2079

1580

kwargs = request[3]

2080

1581

2081

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

2082

funcname)(*args,

2083

**kwargs)))

1582

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

2084

1583

2085

1584

if command == 'getattr':

2086

1585

attrname = request[1]

2087

1586

if callable(client_object.__getattribute__(attrname)):

2088

1587

parent_pipe.send(('function',))

2089

1588

else:

2090

parent_pipe.send(('data', client_object

2091

.__getattribute__(attrname)))

1589

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

2092

1590

2093

1591

if command == 'setattr':

2094

1592

attrname = request[1]

2098

1596

return True

2099

1597

2100

1598

2101

def rfc3339_duration_to_delta(duration):

2102

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

2103

2104

>>> rfc3339_duration_to_delta("P7D")

2105

datetime.timedelta(7)

2106

>>> rfc3339_duration_to_delta("PT60S")

2107

datetime.timedelta(0, 60)

2108

>>> rfc3339_duration_to_delta("PT60M")

2109

datetime.timedelta(0, 3600)

2110

>>> rfc3339_duration_to_delta("PT24H")

2111

datetime.timedelta(1)

2112

>>> rfc3339_duration_to_delta("P1W")

2113

datetime.timedelta(7)

2114

>>> rfc3339_duration_to_delta("PT5M30S")

2115

datetime.timedelta(0, 330)

2116

>>> rfc3339_duration_to_delta("P1DT3M20S")

2117

datetime.timedelta(1, 200)

2118

"""

2119

2120

# Parsing an RFC 3339 duration with regular expressions is not

2121

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

2122

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

2123

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

2124

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

2125

# avoid excessive use of external libraries.

2126

2127

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

2128

Token = collections.namedtuple("Token",

2129

("regexp", # To match token; if

2130

# "value" is not None,

2131

# must have a "group"

2132

# containing digits

2133

"value", # datetime.timedelta or

2134

# None

2135

"followers")) # Tokens valid after

2136

# this token

2137

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

2138

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

2139

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

2140

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

2141

datetime.timedelta(seconds=1),

2142

frozenset((token_end,)))

2143

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

2144

datetime.timedelta(minutes=1),

2145

frozenset((token_second, token_end)))

2146

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

2147

datetime.timedelta(hours=1),

2148

frozenset((token_minute, token_end)))

2149

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

2150

None,

2151

frozenset((token_hour, token_minute,

2152

token_second)))

2153

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

2154

datetime.timedelta(days=1),

2155

frozenset((token_time, token_end)))

2156

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

2157

datetime.timedelta(weeks=4),

2158

frozenset((token_day, token_end)))

2159

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

2160

datetime.timedelta(weeks=52),

2161

frozenset((token_month, token_end)))

2162

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

2163

datetime.timedelta(weeks=1),

2164

frozenset((token_end,)))

2165

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

2166

frozenset((token_year, token_month,

2167

token_day, token_time,

2168

token_week)))

2169

# Define starting values

2170

value = datetime.timedelta() # Value so far

2171

found_token = None

2172

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

2173

s = duration # String left to parse

2174

# Loop until end token is found

2175

while found_token is not token_end:

2176

# Search for any currently valid tokens

2177

for token in followers:

2178

match = token.regexp.match(s)

2179

if match is not None:

2180

# Token found

2181

if token.value is not None:

2182

# Value found, parse digits

2183

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

2184

# Add to value so far

2185

value += factor * token.value

2186

# Strip token from string

2187

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

2188

# Go to found token

2189

found_token = token

2190

# Set valid next tokens

2191

followers = found_token.followers

2192

break

2193

else:

2194

# No currently valid tokens were found

2195

raise ValueError("Invalid RFC 3339 duration")

2196

# End token found

2197

return value

2198

2199

2200

1599

def string_to_delta(interval):

2201

1600

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

2202

1601

2213

1612

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

2214

1613

datetime.timedelta(0, 330)

2215

1614

"""

2216

2217

try:

2218

return rfc3339_duration_to_delta(interval)

2219

except ValueError:

2220

pass

2221

2222

1615

timevalue = datetime.timedelta(0)

2223

1616

for s in interval.split():

2224

1617

try:

2225

suffix = s[-1]

1618

suffix = unicode(s[-1])

2226

1619

value = int(s[:-1])

2227

1620

if suffix == "d":

2228

1621

delta = datetime.timedelta(value)

2235

1628

elif suffix == "w":

2236

1629

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

2237

1630

else:

2238

raise ValueError("Unknown suffix {!r}"

2239

.format(suffix))

2240

except IndexError as e:

1631

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

1632

except (ValueError, IndexError) as e:

2241

1633

raise ValueError(*(e.args))

2242

1634

timevalue += delta

2243

1635

return timevalue

2244

1636

2245

1637

1638

def if_nametoindex(interface):

1639

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

1640

1641

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

1642

global if_nametoindex

1643

try:

1644

if_nametoindex = (ctypes.cdll.LoadLibrary

1645

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

1646

.if_nametoindex)

1647

except (OSError, AttributeError):

1648

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

1649

def if_nametoindex(interface):

1650

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

1651

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

1652

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

1653

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1654

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

1655

interface))

1656

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

1657

ifreq[16:20])[0]

1658

return interface_index

1659

return if_nametoindex(interface)

1660

1661

2246

1662

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

2247

1663

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

2248

1664

2256

1672

sys.exit()

2257

1673

if not noclose:

2258

1674

# Close all standard open file descriptors

2259

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

1675

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

2260

1676

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

2261

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

2262

.format(os.devnull))

1677

raise OSError(errno.ENODEV,

1678

"%s not a character device"

1679

% os.path.devnull)

2263

1680

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

2264

1681

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

2265

1682

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

2274

1691

2275

1692

parser = argparse.ArgumentParser()

2276

1693

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

2277

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

1694

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

2278

1695

help="show version number and exit")

2279

1696

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

2280

1697

help="Bind to interface IF")

2286

1703

help="Run self-test")

2287

1704

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

2288

1705

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

2289

" to terminal", default=None)

1706

" to terminal")

2290

1707

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

2291

1708

help="Debug level for stdout output")

2292

1709

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

2299

1716

" files")

2300

1717

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

2301

1718

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

2302

" system bus interface", default=None)

1719

" system bus interface")

2303

1720

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

2304

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

2305

default=None)

2306

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

2307

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

2308

" state", default=None)

2309

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

2310

help="Specify a file descriptor to a network"

2311

" socket to use instead of creating one")

2312

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

2313

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

2314

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

2315

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

2316

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

2317

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

2318

default=None)

2319

1721

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

2320

1722

options = parser.parse_args()

2321

1723

2322

1724

if options.check:

2323

1725

import doctest

2324

fail_count, test_count = doctest.testmod()

2325

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

1726

doctest.testmod()

1727

sys.exit()

2326

1728

2327

1729

# Default values for config file for server-global settings

2328

1730

server_defaults = { "interface": "",

2330

1732

"port": "",

2331

1733

"debug": "False",

2332

1734

"priority":

2333

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

1735

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

2334

1736

"servicename": "Mandos",

2335

1737

"use_dbus": "True",

2336

1738

"use_ipv6": "True",

2337

1739

"debuglevel": "",

2338

"restore": "True",

2339

"socket": "",

2340

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

2341

"foreground": "False",

2342

"zeroconf": "True",

2343

1740

}

2344

1741

2345

1742

# Parse config file for server-global settings

2350

1747

# Convert the SafeConfigParser object to a dict

2351

1748

server_settings = server_config.defaults()

2352

1749

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

2353

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

1750

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

2354

1751

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

2355

1752

option)

2356

1753

if server_settings["port"]:

2357

1754

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

2358

1755

"port")

2359

if server_settings["socket"]:

2360

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

2361

"socket")

2362

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

2363

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

2364

# happen with a supplied network socket.

2365

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

2366

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

2367

["socket"])

2368

1756

del server_config

2369

1757

2370

1758

# Override the settings from the config file with command line

2371

1759

# options, if set.

2372

1760

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

2373

1761

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

2374

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

2375

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

1762

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

2376

1763

value = getattr(options, option)

2377

1764

if value is not None:

2378

1765

server_settings[option] = value

2379

1766

del options

2380

1767

# Force all strings to be unicode

2381

1768

for option in server_settings.keys():

2382

if isinstance(server_settings[option], bytes):

2383

server_settings[option] = (server_settings[option]

2384

.decode("utf-8"))

2385

# Force all boolean options to be boolean

2386

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

2387

"foreground", "zeroconf"):

2388

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

2389

# Debug implies foreground

2390

if server_settings["debug"]:

2391

server_settings["foreground"] = True

1769

if type(server_settings[option]) is str:

1770

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

2392

1771

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

2393

1772

2394

1773

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

2395

1774

2396

if (not server_settings["zeroconf"] and

2397

not (server_settings["port"]

2398

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

2399

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

2400

" Zeroconf")

2401

2402

1775

# For convenience

2403

1776

debug = server_settings["debug"]

2404

1777

debuglevel = server_settings["debuglevel"]

2405

1778

use_dbus = server_settings["use_dbus"]

2406

1779

use_ipv6 = server_settings["use_ipv6"]

2407

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

2408

stored_state_file)

2409

foreground = server_settings["foreground"]

2410

zeroconf = server_settings["zeroconf"]

2411

2412

if debug:

2413

initlogger(debug, logging.DEBUG)

2414

else:

2415

if not debuglevel:

2416

initlogger(debug)

2417

else:

2418

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

2419

initlogger(debug, level)

2420

1780

2421

1781

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

2422

1782

syslogger.setFormatter(logging.Formatter

2423

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

2424

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

2425

.format(server_settings

2426

["servicename"])))

1783

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

1784

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

1785

% server_settings["servicename"]))

2427

1786

2428

1787

# Parse config file with clients

2429

client_config = configparser.SafeConfigParser(Client

2430

.client_defaults)

1788

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

1789

"extended_timeout": "15m",

1790

"interval": "2m",

1791

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

1792

"host": "",

1793

"approval_delay": "0s",

1794

"approval_duration": "1s",

1795

}

1796

client_config = configparser.SafeConfigParser(client_defaults)

2431

1797

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

2432

1798

"clients.conf"))

2433

1799

2434

1800

global mandos_dbus_service

2435

1801

mandos_dbus_service = None

2436

1802

2437

socketfd = None

2438

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

2439

socketfd = server_settings["socket"]

2440

1803

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

2441

1804

server_settings["port"]),

2442

1805

ClientHandler,

2445

1808

use_ipv6=use_ipv6,

2446

1809

gnutls_priority=

2447

1810

server_settings["priority"],

2448

use_dbus=use_dbus,

2449

socketfd=socketfd)

2450

if not foreground:

2451

pidfilename = "/run/mandos.pid"

2452

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

2453

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

2454

pidfile = None

1811

use_dbus=use_dbus)

1812

if not debug:

1813

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

2455

1814

try:

2456

1815

pidfile = open(pidfilename, "w")

2457

except IOError as e:

2458

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

2459

exc_info=e)

1816

except IOError:

1817

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

2460

1818

2461

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

1819

try:

1820

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

1821

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

1822

except KeyError:

2462

1823

try:

2463

uid = pwd.getpwnam(name).pw_uid

2464

gid = pwd.getpwnam(name).pw_gid

2465

break

1824

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

1825

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

2466

1826

except KeyError:

2467

continue

2468

else:

2469

uid = 65534

2470

gid = 65534

1827

try:

1828

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

1829

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

1830

except KeyError:

1831

uid = 65534

1832

gid = 65534

2471

1833

try:

2472

1834

os.setgid(gid)

2473

1835

os.setuid(uid)

2474

1836

except OSError as error:

2475

if error.errno != errno.EPERM:

2476

raise

1837

if error[0] != errno.EPERM:

1838

raise error

1839

1840

if not debug and not debuglevel:

1841

syslogger.setLevel(logging.WARNING)

1842

console.setLevel(logging.WARNING)

1843

if debuglevel:

1844

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

1845

syslogger.setLevel(level)

1846

console.setLevel(level)

2477

1847

2478

1848

if debug:

2479

1849

# Enable all possible GnuTLS debugging

2490

1860

.gnutls_global_set_log_function(debug_gnutls))

2491

1861

2492

1862

# Redirect stdin so all checkers get /dev/null

2493

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

1863

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

2494

1864

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

2495

1865

if null > 2:

2496

1866

os.close(null)

1867

else:

1868

# No console logging

1869

logger.removeHandler(console)

2497

1870

2498

1871

# Need to fork before connecting to D-Bus

2499

if not foreground:

1872

if not debug:

2500

1873

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

2501

1874

daemon()

2502

1875

2503

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

2504

# need to inform gobject that threads will be used.

2505

gobject.threads_init()

2506

2507

1876

global main_loop

2508

1877

# From the Avahi example code

2509

DBusGMainLoop(set_as_default=True)

1878

DBusGMainLoop(set_as_default=True )

2510

1879

main_loop = gobject.MainLoop()

2511

1880

bus = dbus.SystemBus()

2512

1881

# End of Avahi example code

2513

1882

if use_dbus:

2514

1883

try:

2515

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

1884

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

2516

1885

bus, do_not_queue=True)

2517

old_bus_name = (dbus.service.BusName

2518

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

2519

do_not_queue=True))

2520

1886

except dbus.exceptions.NameExistsException as e:

2521

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

1887

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

2522

1888

use_dbus = False

2523

1889

server_settings["use_dbus"] = False

2524

1890

tcp_server.use_dbus = False

2525

if zeroconf:

2526

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2527

service = AvahiServiceToSyslog(name =

2528

server_settings["servicename"],

2529

servicetype = "_mandos._tcp",

2530

protocol = protocol, bus = bus)

2531

if server_settings["interface"]:

2532

service.interface = (if_nametoindex

2533

(server_settings["interface"]

2534

.encode("utf-8")))

1891

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1892

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

1893

servicetype = "_mandos._tcp",

1894

protocol = protocol, bus = bus)

1895

if server_settings["interface"]:

1896

service.interface = (if_nametoindex

1897

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

2535

1898

2536

1899

global multiprocessing_manager

2537

1900

multiprocessing_manager = multiprocessing.Manager()

2539

1902

client_class = Client

2540

1903

if use_dbus:

2541

1904

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

2542

2543

client_settings = Client.config_parser(client_config)

2544

old_client_settings = {}

2545

clients_data = {}

2546

2547

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

2548

global wnull

2549

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

2550

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

2551

# mode

2552

if debug or not foreground:

2553

wnull.close()

2554

2555

# Get client data and settings from last running state.

2556

if server_settings["restore"]:

2557

try:

2558

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

2559

clients_data, old_client_settings = (pickle.load

2560

(stored_state))

2561

os.remove(stored_state_path)

2562

except IOError as e:

2563

if e.errno == errno.ENOENT:

2564

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

2565

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

2566

else:

2567

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

2568

exc_info=e)

2569

raise

2570

except EOFError as e:

2571

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

2572

"EOFError:", exc_info=e)

2573

2574

with PGPEngine() as pgp:

2575

for client_name, client in clients_data.items():

2576

# Skip removed clients

2577

if client_name not in client_settings:

2578

continue

2579

2580

# Decide which value to use after restoring saved state.

2581

# We have three different values: Old config file,

2582

# new config file, and saved state.

2583

# New config value takes precedence if it differs from old

2584

# config value, otherwise use saved state.

2585

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

2586

try:

2587

# For each value in new config, check if it

2588

# differs from the old config value (Except for

2589

# the "secret" attribute)

2590

if (name != "secret" and

2591

value != old_client_settings[client_name]

2592

[name]):

2593

client[name] = value

2594

except KeyError:

2595

pass

2596

2597

# Clients who has passed its expire date can still be

2598

# enabled if its last checker was successful. Clients

2599

# whose checker succeeded before we stored its state is

2600

# assumed to have successfully run all checkers during

2601

# downtime.

2602

if client["enabled"]:

2603

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

2604

if not client["last_checked_ok"]:

2605

logger.warning(

2606

"disabling client {} - Client never "

2607

"performed a successful checker"

2608

.format(client_name))

2609

client["enabled"] = False

2610

elif client["last_checker_status"] != 0:

2611

logger.warning(

2612

"disabling client {} - Client last"

2613

" checker failed with error code {}"

2614

.format(client_name,

2615

client["last_checker_status"]))

2616

client["enabled"] = False

2617

else:

2618

client["expires"] = (datetime.datetime

2619

.utcnow()

2620

+ client["timeout"])

2621

logger.debug("Last checker succeeded,"

2622

" keeping {} enabled"

2623

.format(client_name))

1905

def client_config_items(config, section):

1906

special_settings = {

1907

"approved_by_default":

1908

lambda: config.getboolean(section,

1909

"approved_by_default"),

1910

}

1911

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

2624

1912

try:

2625

client["secret"] = (

2626

pgp.decrypt(client["encrypted_secret"],

2627

client_settings[client_name]

2628

["secret"]))

2629

except PGPError:

2630

# If decryption fails, we use secret from new settings

2631

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

2632

.format(client_name))

2633

client["secret"] = (

2634

client_settings[client_name]["secret"])

2635

2636

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

2637

for client_name in (set(old_client_settings)

2638

- set(client_settings)):

2639

del clients_data[client_name]

2640

for client_name in (set(client_settings)

2641

- set(old_client_settings)):

2642

clients_data[client_name] = client_settings[client_name]

2643

2644

# Create all client objects

2645

for client_name, client in clients_data.items():

2646

tcp_server.clients[client_name] = client_class(

2647

name = client_name, settings = client,

2648

server_settings = server_settings)

2649

1913

yield (name, special_settings[name]())

1914

except KeyError:

1915

yield (name, value)

1916

1917

tcp_server.clients.update(set(

1918

client_class(name = section,

1919

config= dict(client_config_items(

1920

client_config, section)))

1921

for section in client_config.sections()))

2650

1922

if not tcp_server.clients:

2651

1923

logger.warning("No clients defined")

2652

2653

if not foreground:

2654

if pidfile is not None:

2655

try:

2656

with pidfile:

2657

pid = os.getpid()

2658

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

2659

except IOError:

2660

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

2661

pidfilename, pid)

2662

del pidfile

1924

1925

if not debug:

1926

try:

1927

with pidfile:

1928

pid = os.getpid()

1929

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

1930

del pidfile

1931

except IOError:

1932

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

1933

pidfilename, pid)

1934

except NameError:

1935

# "pidfile" was never created

1936

pass

2663

1937

del pidfilename

1938

1939

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

2664

1940

2665

1941

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

2666

1942

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

2667

1943

2668

1944

if use_dbus:

2669

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

2670

"se.bsnet.fukt.Mandos"})

2671

class MandosDBusService(DBusObjectWithProperties):

1945

class MandosDBusService(dbus.service.Object):

2672

1946

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

2673

1947

def __init__(self):

2674

1948

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

2675

_interface = "se.recompile.Mandos"

2676

2677

@dbus_interface_annotations(_interface)

2678

def _foo(self):

2679

return { "org.freedesktop.DBus.Property"

2680

".EmitsChangedSignal":

2681

"false"}

1949

_interface = "se.bsnet.fukt.Mandos"

2682

1950

2683

1951

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

2684

1952

def ClientAdded(self, objpath):

2699

1967

def GetAllClients(self):

2700

1968

"D-Bus method"

2701

1969

return dbus.Array(c.dbus_object_path

2702

for c in

2703

tcp_server.clients.itervalues())

1970

for c in tcp_server.clients)

2704

1971

2705

1972

@dbus.service.method(_interface,

2706

1973

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

2708

1975

"D-Bus method"

2709

1976

return dbus.Dictionary(

2710

1977

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

2711

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

1978

for c in tcp_server.clients),

2712

1979

signature="oa{sv}")

2713

1980

2714

1981

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

2715

1982

def RemoveClient(self, object_path):

2716

1983

"D-Bus method"

2717

for c in tcp_server.clients.itervalues():

1984

for c in tcp_server.clients:

2718

1985

if c.dbus_object_path == object_path:

2719

del tcp_server.clients[c.name]

1986

tcp_server.clients.remove(c)

2720

1987

c.remove_from_connection()

2721

1988

# Don't signal anything except ClientRemoved

2722

1989

c.disable(quiet=True)

2731

1998

2732

1999

def cleanup():

2733

2000

"Cleanup function; run on exit"

2734

if zeroconf:

2735

service.cleanup()

2736

2737

multiprocessing.active_children()

2738

wnull.close()

2739

if not (tcp_server.clients or client_settings):

2740

return

2741

2742

# Store client before exiting. Secrets are encrypted with key

2743

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

2744

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

2745

clients = {}

2746

with PGPEngine() as pgp:

2747

for client in tcp_server.clients.itervalues():

2748

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

2749

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

2750

key)

2751

client_dict = {}

2752

2753

# A list of attributes that can not be pickled

2754

# + secret.

2755

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

2756

"checker", "server_settings" }

2757

for name, typ in (inspect.getmembers

2758

(dbus.service.Object)):

2759

exclude.add(name)

2760

2761

client_dict["encrypted_secret"] = (client

2762

.encrypted_secret)

2763

for attr in client.client_structure:

2764

if attr not in exclude:

2765

client_dict[attr] = getattr(client, attr)

2766

2767

clients[client.name] = client_dict

2768

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

2769

2770

try:

2771

with (tempfile.NamedTemporaryFile

2772

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

2773

dir=os.path.dirname(stored_state_path),

2774

delete=False)) as stored_state:

2775

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

2776

tempname=stored_state.name

2777

os.rename(tempname, stored_state_path)

2778

except (IOError, OSError) as e:

2779

if not debug:

2780

try:

2781

os.remove(tempname)

2782

except NameError:

2783

pass

2784

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

2785

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

2786

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

2787

else:

2788

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

2789

exc_info=e)

2790

raise

2791

2792

# Delete all clients, and settings from config

2001

service.cleanup()

2002

2793

2003

while tcp_server.clients:

2794

name, client = tcp_server.clients.popitem()

2004

client = tcp_server.clients.pop()

2795

2005

if use_dbus:

2796

2006

client.remove_from_connection()

2007

client.disable_hook = None

2797

2008

# Don't signal anything except ClientRemoved

2798

2009

client.disable(quiet=True)

2799

2010

if use_dbus:

2800

2011

# Emit D-Bus signal

2801

mandos_dbus_service.ClientRemoved(client

2802

.dbus_object_path,

2012

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2803

2013

client.name)

2804

client_settings.clear()

2805

2014

2806

2015

atexit.register(cleanup)

2807

2016

2808

for client in tcp_server.clients.itervalues():

2017

for client in tcp_server.clients:

2809

2018

if use_dbus:

2810

2019

# Emit D-Bus signal

2811

2020

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2812

# Need to initiate checking of clients

2813

if client.enabled:

2814

client.init_checker()

2021

client.enable()

2815

2022

2816

2023

tcp_server.enable()

2817

2024

tcp_server.server_activate()

2818

2025

2819

2026

# Find out what port we got

2820

if zeroconf:

2821

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

2027

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

2822

2028

if use_ipv6:

2823

2029

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

2824

" flowinfo %d, scope_id %d",

2825

*tcp_server.socket.getsockname())

2030

" flowinfo %d, scope_id %d"

2031

% tcp_server.socket.getsockname())

2826

2032

else: # IPv4

2827

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

2828

*tcp_server.socket.getsockname())

2033

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

2034

% tcp_server.socket.getsockname())

2829

2035

2830

2036

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

2831

2037

2832

2038

try:

2833

if zeroconf:

2834

# From the Avahi example code

2835

try:

2836

service.activate()

2837

except dbus.exceptions.DBusException as error:

2838

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

2839

cleanup()

2840

sys.exit(1)

2841

# End of Avahi example code

2039

# From the Avahi example code

2040

try:

2041

service.activate()

2042

except dbus.exceptions.DBusException as error:

2043

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

2044

cleanup()

2045

sys.exit(1)

2046

# End of Avahi example code

2842

2047

2843

2048

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

2844

2049

lambda *args, **kwargs:

2848

2053

logger.debug("Starting main loop")

2849

2054

main_loop.run()

2850

2055

except AvahiError as error:

2851

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

2056

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

2852

2057

cleanup()

2853

2058

sys.exit(1)

2854

2059

except KeyboardInterrupt:

2859

2064

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

2860

2065

cleanup()

2861

2066

2067

2862

2068

if __name__ == '__main__':

2863

2069

main()