/mandos/trunk : revision 505.1.6

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#!/usr/bin/python2.7

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#!/usr/bin/python

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

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#

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

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import dbus

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import dbus.service

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except ImportError:

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.6.9"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = None

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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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, remove=True):

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = str(self.server

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.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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

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self.name)

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if remove:

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self.remove()

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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if (error.get_dbus_name()

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

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

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return self.rename(remove=False)

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else:

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

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self.cleanup()

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os._exit(1)

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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self.rename()

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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str(error))

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

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.format(error))

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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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, *args, **kwargs):

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

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ret = AvahiService.rename(self, *args, **kwargs)

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syslogger.setFormatter(logging.Formatter

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

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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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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the

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# fingerprint() function

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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def 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:

523

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:

340

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()

344

# function

345

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",

542

datetime.datetime.utcnow())

543

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# attributes specific for this server instance

348

if "secret" in config:

349

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

350

elif "secfile" in config:

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

352

(config["secfile"])),

353

"rb") as secfile:

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self.secret = secfile.read()

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else:

356

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

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% self.name)

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

359

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

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["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

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

372

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

550

self.approved = None

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self.last_connect = None

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self._approved = None

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

379

True)

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self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

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386

.Condition(multiprocessing_manager

554

387

.Lock()))

555

self.client_structure = [attr for attr in

556

self.__dict__.iterkeys()

557

if not attr.startswith("_")]

558

self.client_structure.append("client_structure")

559

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

561

lambda obj:

562

isinstance(obj,

563

property)):

564

if not name.startswith("_"):

565

self.client_structure.append(name)

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# Send notice to process children that client state has changed

568

389

def send_changedstate(self):

569

with self.changedstate:

570

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

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def enable(self):

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395

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

574

396

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

575

397

# Already enabled

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return

399

self.send_changedstate()

400

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

401

# and every interval from then on.

402

self.checker_initiator_tag = (gobject.timeout_add

403

(self.interval_milliseconds(),

404

self.start_checker))

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

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

407

self.disable_initiator_tag = (gobject.timeout_add

408

(self.timeout_milliseconds(),

409

self.disable))

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self.enabled = True

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411

self.last_enabled = datetime.datetime.utcnow()

580

self.init_checker()

581

self.send_changedstate()

412

# Also start a new checker *right now*.

413

self.start_checker()

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415

def disable(self, quiet=True):

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416

"""Disable this client."""

585

417

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

586

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return False

587

419

if not quiet:

420

self.send_changedstate()

421

if not quiet:

588

422

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

589

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

423

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

590

424

gobject.source_remove(self.disable_initiator_tag)

591

425

self.disable_initiator_tag = None

592

426

self.expires = None

593

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

427

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

594

428

gobject.source_remove(self.checker_initiator_tag)

595

429

self.checker_initiator_tag = None

596

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

597

433

self.enabled = False

598

if not quiet:

599

self.send_changedstate()

600

434

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

601

435

return False

602

436

603

437

def __del__(self):

438

self.disable_hook = None

604

439

self.disable()

605

440

606

def init_checker(self):

607

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

608

# and every interval from then on.

609

if self.checker_initiator_tag is not None:

610

gobject.source_remove(self.checker_initiator_tag)

611

self.checker_initiator_tag = (gobject.timeout_add

612

(int(self.interval

613

.total_seconds() * 1000),

614

self.start_checker))

615

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

616

if self.disable_initiator_tag is not None:

617

gobject.source_remove(self.disable_initiator_tag)

618

self.disable_initiator_tag = (gobject.timeout_add

619

(int(self.timeout

620

.total_seconds() * 1000),

621

self.disable))

622

# Also start a new checker *right now*.

623

self.start_checker()

624

625

441

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

626

442

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

627

443

self.checker_callback_tag = None

628

444

self.checker = None

629

445

if os.WIFEXITED(condition):

630

self.last_checker_status = os.WEXITSTATUS(condition)

631

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

632

448

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

633

449

vars(self))

634

450

self.checked_ok()

636

452

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

637

453

vars(self))

638

454

else:

639

self.last_checker_status = -1

640

455

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

641

456

vars(self))

642

457

643

def checked_ok(self):

644

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

645

self.last_checked_ok = datetime.datetime.utcnow()

646

self.last_checker_status = 0

647

self.bump_timeout()

648

649

def bump_timeout(self, timeout=None):

650

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

458

def checked_ok(self, timeout=None):

459

"""Bump up the timeout for this client.

460

461

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

462

alive and well.

463

"""

651

464

if timeout is None:

652

465

timeout = self.timeout

653

if self.disable_initiator_tag is not None:

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

656

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

657

self.disable_initiator_tag = (gobject.timeout_add

658

(int(timeout.total_seconds()

659

* 1000), self.disable))

660

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

466

self.last_checked_ok = datetime.datetime.utcnow()

467

gobject.source_remove(self.disable_initiator_tag)

468

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

469

self.disable_initiator_tag = (gobject.timeout_add

470

(_timedelta_to_milliseconds

471

(timeout), self.disable))

661

472

662

473

def need_approval(self):

663

474

self.last_approval_request = datetime.datetime.utcnow()

668

479

If a checker already exists, leave it running and do

669

480

nothing."""

670

481

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

671

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

672

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

673

# would inevitably timeout, since no checker would get a

674

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

482

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

483

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

484

# client would inevitably timeout, since no checker would get

485

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

675

486

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

676

487

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

677

488

# should be.

679

490

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

680

491

try:

681

492

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

682

except AttributeError:

683

pass

684

except OSError as error:

685

if error.errno != errno.ECHILD:

686

raise

493

except (AttributeError, OSError) as error:

494

if (isinstance(error, OSError)

495

and error.errno != errno.ECHILD):

496

raise error

687

497

else:

688

498

if pid:

689

499

logger.warning("Checker was a zombie")

692

502

self.current_checker_command)

693

503

# Start a new checker if needed

694

504

if self.checker is None:

695

# Escape attributes for the shell

696

escaped_attrs = { attr:

697

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

698

for attr in self.runtime_expansions }

699

505

try:

700

command = self.checker_command % escaped_attrs

701

except TypeError as error:

702

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

703

self.checker_command, exc_info=error)

704

return True # Try again later

506

# In case checker_command has exactly one % operator

507

command = self.checker_command % self.host

508

except TypeError:

509

# Escape attributes for the shell

510

escaped_attrs = dict(

511

(attr,

512

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

513

errors=

514

'replace')))

515

for attr in

516

self.runtime_expansions)

517

518

try:

519

command = self.checker_command % escaped_attrs

520

except TypeError as error:

521

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

522

' %s', self.checker_command, error)

523

return True # Try again later

705

524

self.current_checker_command = command

706

525

try:

707

526

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

710

529

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

711

530

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

712

531

# always replaced by /dev/null.)

713

# The exception is when not debugging but nevertheless

714

# running in the foreground; use the previously

715

# created wnull.

716

popen_args = {}

717

if (not self.server_settings["debug"]

718

and self.server_settings["foreground"]):

719

popen_args.update({"stdout": wnull,

720

"stderr": wnull })

721

532

self.checker = subprocess.Popen(command,

722

533

close_fds=True,

723

shell=True, cwd="/",

724

**popen_args)

725

except OSError as error:

726

logger.error("Failed to start subprocess",

727

exc_info=error)

728

return True

729

self.checker_callback_tag = (gobject.child_watch_add

730

(self.checker.pid,

731

self.checker_callback,

732

data=command))

733

# The checker may have completed before the gobject

734

# watch was added. Check for this.

735

try:

534

shell=True, cwd="/")

535

self.checker_callback_tag = (gobject.child_watch_add

536

(self.checker.pid,

537

self.checker_callback,

538

data=command))

539

# The checker may have completed before the gobject

540

# watch was added. Check for this.

736

541

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

542

if pid:

543

gobject.source_remove(self.checker_callback_tag)

544

self.checker_callback(pid, status, command)

737

545

except OSError as error:

738

if error.errno == errno.ECHILD:

739

# This should never happen

740

logger.error("Child process vanished",

741

exc_info=error)

742

return True

743

raise

744

if pid:

745

gobject.source_remove(self.checker_callback_tag)

746

self.checker_callback(pid, status, command)

546

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

547

error)

747

548

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

748

549

return True

749

550

756

557

return

757

558

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

758

559

try:

759

self.checker.terminate()

560

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

760

561

#time.sleep(0.5)

761

562

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

762

# self.checker.kill()

563

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

763

564

except OSError as error:

764

565

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

765

566

raise

782

583

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

783

584

if byte_arrays and signature != "ay":

784

585

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

785

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

586

" signature %r" % signature)

786

587

def decorator(func):

787

588

func._dbus_is_property = True

788

589

func._dbus_interface = dbus_interface

796

597

return decorator

797

598

798

599

799

def dbus_interface_annotations(dbus_interface):

800

"""Decorator for marking functions returning interface annotations

801

802

Usage:

803

804

@dbus_interface_annotations("org.example.Interface")

805

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

806

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

807

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

808

"false"}

809

"""

810

def decorator(func):

811

func._dbus_is_interface = True

812

func._dbus_interface = dbus_interface

813

func._dbus_name = dbus_interface

814

return func

815

return decorator

816

817

818

def dbus_annotations(annotations):

819

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

820

Usage:

821

822

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

823

"org.freedesktop.DBus.Property."

824

"EmitsChangedSignal": "false"})

825

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

826

access="r")

827

def Property_dbus_property(self):

828

return dbus.Boolean(False)

829

"""

830

def decorator(func):

831

func._dbus_annotations = annotations

832

return func

833

return decorator

834

835

836

600

class DBusPropertyException(dbus.exceptions.DBusException):

837

601

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

838

602

"""

839

pass

603

def __unicode__(self):

604

return unicode(str(self))

605

840

606

841

607

class DBusPropertyAccessException(DBusPropertyException):

842

608

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

859

625

"""

860

626

861

627

@staticmethod

862

def _is_dbus_thing(thing):

863

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

864

865

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

866

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

867

"""

868

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

869

False)

628

def _is_dbus_property(obj):

629

return getattr(obj, "_dbus_is_property", False)

870

630

871

def _get_all_dbus_things(self, thing):

631

def _get_all_dbus_properties(self):

872

632

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

873

633

"""

874

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

875

name),

876

athing.__get__(self))

634

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

877

635

for cls in self.__class__.__mro__

878

for name, athing in

879

inspect.getmembers(cls,

880

self._is_dbus_thing(thing)))

636

for name, prop in

637

inspect.getmembers(cls, self._is_dbus_property))

881

638

882

639

def _get_dbus_property(self, interface_name, property_name):

883

640

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

885

642

"""

886

643

for cls in self.__class__.__mro__:

887

644

for name, value in (inspect.getmembers

888

(cls,

889

self._is_dbus_thing("property"))):

645

(cls, self._is_dbus_property)):

890

646

if (value._dbus_name == property_name

891

647

and value._dbus_interface == interface_name):

892

648

return value.__get__(self)

920

676

# The byte_arrays option is not supported yet on

921

677

# signatures other than "ay".

922

678

if prop._dbus_signature != "ay":

923

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

924

"'ay' signature {!r}"

925

.format(prop._dbus_signature))

926

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

927

for byte in value))

679

raise ValueError

680

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

681

for byte in value))

928

682

prop(value)

929

683

930

684

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

935

689

936

690

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

937

691

"""

938

properties = {}

939

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

692

all = {}

693

for name, prop in self._get_all_dbus_properties():

940

694

if (interface_name

941

695

and interface_name != prop._dbus_interface):

942

696

# Interface non-empty but did not match

946

700

continue

947

701

value = prop()

948

702

if not hasattr(value, "variant_level"):

949

properties[name] = value

703

all[name] = value

950

704

continue

951

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

952

value.variant_level+1)

953

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

954

955

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

956

def PropertiesChanged(self, interface_name, changed_properties,

957

invalidated_properties):

958

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

959

standard.

960

"""

961

pass

705

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

706

value.variant_level+1)

707

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

962

708

963

709

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

964

710

out_signature="s",

965

711

path_keyword='object_path',

966

712

connection_keyword='connection')

967

713

def Introspect(self, object_path, connection):

968

"""Overloading of standard D-Bus method.

969

970

Inserts property tags and interface annotation tags.

714

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

971

715

"""

972

716

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

973

717

connection)

980

724

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

981

725

return e

982

726

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

983

# Add property tags

984

727

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

985

728

for name, prop

986

in self._get_all_dbus_things("property")

729

in self._get_all_dbus_properties()

987

730

if prop._dbus_interface

988

731

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

989

732

if_tag.appendChild(tag)

990

# Add annotation tags

991

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

992

for tag in if_tag.getElementsByTagName(typ):

993

annots = dict()

994

for name, prop in (self.

995

_get_all_dbus_things(typ)):

996

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

997

and prop._dbus_interface

998

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

999

annots.update(getattr

1000

(prop,

1001

"_dbus_annotations",

1002

{}))

1003

for name, value in annots.items():

1004

ann_tag = document.createElement(

1005

"annotation")

1006

ann_tag.setAttribute("name", name)

1007

ann_tag.setAttribute("value", value)

1008

tag.appendChild(ann_tag)

1009

# Add interface annotation tags

1010

for annotation, value in dict(

1011

itertools.chain.from_iterable(

1012

annotations().items()

1013

for name, annotations in

1014

self._get_all_dbus_things("interface")

1015

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

1016

)).items():

1017

ann_tag = document.createElement("annotation")

1018

ann_tag.setAttribute("name", annotation)

1019

ann_tag.setAttribute("value", value)

1020

if_tag.appendChild(ann_tag)

1021

733

# Add the names to the return values for the

1022

734

# "org.freedesktop.DBus.Properties" methods

1023

735

if (if_tag.getAttribute("name")

1038

750

except (AttributeError, xml.dom.DOMException,

1039

751

xml.parsers.expat.ExpatError) as error:

1040

752

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

1041

exc_info=error)

753

error)

1042

754

return xmlstring

1043

755

1044

756

1045

def datetime_to_dbus(dt, variant_level=0):

757

def datetime_to_dbus (dt, variant_level=0):

1046

758

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

1047

759

if dt is None:

1048

760

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

1049

761

return dbus.String(dt.isoformat(),

1050

762

variant_level=variant_level)

1051

763

1052

1053

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1054

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

1055

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

1056

interface names according to the "alt_interface_names" mapping.

1057

Usage:

1058

1059

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

1060

"net.example.AlternateInterface"})

1061

class SampleDBusObject(dbus.service.Object):

1062

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

1063

def SampleDBusMethod():

1064

pass

1065

1066

The above "SampleDBusMethod" on "SampleDBusObject" will be

1067

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

1068

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

1069

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

1070

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

1071

1072

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

1073

(from DBusObjectWithProperties) and interfaces (from the

1074

dbus_interface_annotations decorator).

764

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

765

.__metaclass__):

766

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

767

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

1075

768

"""

1076

def wrapper(cls):

1077

for orig_interface_name, alt_interface_name in (

1078

alt_interface_names.items()):

1079

attr = {}

1080

interface_names = set()

1081

# Go though all attributes of the class

1082

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

769

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

770

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

771

# methods, signals, or properties in them

772

for base in (b for b in bases

773

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

774

# Go though all attributes of the base class

775

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

1083

776

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

1084

777

# with the wrong interface name

1085

778

if (not hasattr(attribute, "_dbus_interface")

1086

779

or not attribute._dbus_interface

1087

.startswith(orig_interface_name)):

780

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

1088

781

continue

1089

782

# Create an alternate D-Bus interface name based on

1090

783

# the current name

1091

784

alt_interface = (attribute._dbus_interface

1092

.replace(orig_interface_name,

1093

alt_interface_name))

1094

interface_names.add(alt_interface)

785

.replace("se.recompile.Mandos",

786

"se.bsnet.fukt.Mandos"))

1095

787

# Is this a D-Bus signal?

1096

788

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

1097

# Extract the original non-method undecorated

1098

# function by black magic

789

# Extract the original non-method function by

790

# black magic

1099

791

nonmethod_func = (dict(

1100

792

zip(attribute.func_code.co_freevars,

1101

793

attribute.__closure__))["func"]

1112

804

nonmethod_func.func_name,

1113

805

nonmethod_func.func_defaults,

1114

806

nonmethod_func.func_closure)))

1115

# Copy annotations, if any

1116

try:

1117

new_function._dbus_annotations = (

1118

dict(attribute._dbus_annotations))

1119

except AttributeError:

1120

pass

1121

807

# Define a creator of a function to call both the

1122

# original and alternate functions, so both the

1123

# original and alternate signals gets sent when

1124

# the function is called

808

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

809

# signals gets sent when the function is called

1125

810

def fixscope(func1, func2):

1126

811

"""This function is a scope container to pass

1127

812

func1 and func2 to the "call_both" function

1134

819

return call_both

1135

820

# Create the "call_both" function and add it to

1136

821

# the class

1137

attr[attrname] = fixscope(attribute, new_function)

822

attr[attrname] = fixscope(attribute,

823

new_function)

1138

824

# Is this a D-Bus method?

1139

825

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

1140

826

# Create a new, but exactly alike, function

1151

837

attribute.func_name,

1152

838

attribute.func_defaults,

1153

839

attribute.func_closure)))

1154

# Copy annotations, if any

1155

try:

1156

attr[attrname]._dbus_annotations = (

1157

dict(attribute._dbus_annotations))

1158

except AttributeError:

1159

pass

1160

840

# Is this a D-Bus property?

1161

841

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

1162

842

# Create a new, but exactly alike, function

1176

856

attribute.func_name,

1177

857

attribute.func_defaults,

1178

858

attribute.func_closure)))

1179

# Copy annotations, if any

1180

try:

1181

attr[attrname]._dbus_annotations = (

1182

dict(attribute._dbus_annotations))

1183

except AttributeError:

1184

pass

1185

# Is this a D-Bus interface?

1186

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

1187

# Create a new, but exactly alike, function

1188

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

1189

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

1190

# to the class.

1191

attr[attrname] = (dbus_interface_annotations

1192

(alt_interface)

1193

(types.FunctionType

1194

(attribute.func_code,

1195

attribute.func_globals,

1196

attribute.func_name,

1197

attribute.func_defaults,

1198

attribute.func_closure)))

1199

if deprecate:

1200

# Deprecate all alternate interfaces

1201

iname="_AlternateDBusNames_interface_annotation{}"

1202

for interface_name in interface_names:

1203

@dbus_interface_annotations(interface_name)

1204

def func(self):

1205

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

1206

"true" }

1207

# Find an unused name

1208

for aname in (iname.format(i)

1209

for i in itertools.count()):

1210

if aname not in attr:

1211

attr[aname] = func

1212

break

1213

if interface_names:

1214

# Replace the class with a new subclass of it with

1215

# methods, signals, etc. as created above.

1216

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

1217

(cls,), attr)

1218

return cls

1219

return wrapper

1220

1221

1222

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

1223

"se.bsnet.fukt.Mandos"})

859

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

860

1224

861

class ClientDBus(Client, DBusObjectWithProperties):

1225

862

"""A Client class using D-Bus

1226

863

1232

869

runtime_expansions = (Client.runtime_expansions

1233

870

+ ("dbus_object_path",))

1234

871

1235

_interface = "se.recompile.Mandos.Client"

1236

1237

872

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

1238

873

1239

874

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

875

self._approvals_pending = 0

1240

876

self.bus = bus

1241

877

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

1242

878

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

1243

879

# the D-Bus

1244

client_object_name = str(self.name).translate(

880

client_object_name = unicode(self.name).translate(

1245

881

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

1246

882

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

1247

883

self.dbus_object_path = (dbus.ObjectPath

1248

884

("/clients/" + client_object_name))

1249

885

DBusObjectWithProperties.__init__(self, self.bus,

1250

886

self.dbus_object_path)

1251

887

1252

888

def notifychangeproperty(transform_func,

1253

889

dbus_name, type_func=lambda x: x,

1254

variant_level=1, invalidate_only=False,

1255

_interface=_interface):

890

variant_level=1):

1256

891

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

1257

892

its changes to DBus.

1258

1259

transform_fun: Function that takes a value and a variant_level

1260

and transforms it to a D-Bus type.

893

894

transform_fun: Function that takes a value and transforms it

895

to a D-Bus type.

1261

896

dbus_name: D-Bus name of the variable

1262

897

type_func: Function that transform the value before sending it

1263

898

to the D-Bus. Default: no transform

1264

899

variant_level: D-Bus variant level. Default: 1

1265

900

"""

1266

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

901

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

1267

902

def setter(self, value):

1268

903

if hasattr(self, "dbus_object_path"):

1269

904

if (not hasattr(self, attrname) or

1270

905

type_func(getattr(self, attrname, None))

1271

906

!= type_func(value)):

1272

if invalidate_only:

1273

self.PropertiesChanged(_interface,

1274

dbus.Dictionary(),

1275

dbus.Array

1276

((dbus_name,)))

1277

else:

1278

dbus_value = transform_func(type_func(value),

1279

variant_level

1280

=variant_level)

1281

self.PropertyChanged(dbus.String(dbus_name),

1282

dbus_value)

1283

self.PropertiesChanged(_interface,

1284

dbus.Dictionary({

1285

dbus.String(dbus_name):

1286

dbus_value }), dbus.Array())

907

dbus_value = transform_func(type_func(value),

908

variant_level)

909

self.PropertyChanged(dbus.String(dbus_name),

910

dbus_value)

1287

911

setattr(self, attrname, value)

1288

912

1289

913

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

1290

914

915

1291

916

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1292

917

approvals_pending = notifychangeproperty(dbus.Boolean,

1293

918

"ApprovalPending",

1300

925

checker is not None)

1301

926

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1302

927

"LastCheckedOK")

1303

last_checker_status = notifychangeproperty(dbus.Int16,

1304

"LastCheckerStatus")

1305

928

last_approval_request = notifychangeproperty(

1306

929

datetime_to_dbus, "LastApprovalRequest")

1307

930

approved_by_default = notifychangeproperty(dbus.Boolean,

1308

931

"ApprovedByDefault")

1309

approval_delay = notifychangeproperty(dbus.UInt64,

932

approval_delay = notifychangeproperty(dbus.UInt16,

1310

933

"ApprovalDelay",

1311

934

type_func =

1312

lambda td: td.total_seconds()

1313

* 1000)

935

_timedelta_to_milliseconds)

1314

936

approval_duration = notifychangeproperty(

1315

dbus.UInt64, "ApprovalDuration",

1316

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

937

dbus.UInt16, "ApprovalDuration",

938

type_func = _timedelta_to_milliseconds)

1317

939

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

1318

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

1319

type_func = lambda td:

1320

td.total_seconds() * 1000)

940

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

941

type_func =

942

_timedelta_to_milliseconds)

1321

943

extended_timeout = notifychangeproperty(

1322

dbus.UInt64, "ExtendedTimeout",

1323

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

1324

interval = notifychangeproperty(dbus.UInt64,

944

dbus.UInt16, "ExtendedTimeout",

945

type_func = _timedelta_to_milliseconds)

946

interval = notifychangeproperty(dbus.UInt16,

1325

947

"Interval",

1326

948

type_func =

1327

lambda td: td.total_seconds()

1328

* 1000)

949

_timedelta_to_milliseconds)

1329

950

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

1330

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

1331

invalidate_only=True)

1332

951

1333

952

del notifychangeproperty

1334

953

1361

980

*args, **kwargs)

1362

981

1363

982

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

1364

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

983

old_checker = self.checker

984

if self.checker is not None:

985

old_checker_pid = self.checker.pid

986

else:

987

old_checker_pid = None

1365

988

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

1366

989

# Only if new checker process was started

1367

990

if (self.checker is not None

1371

994

return r

1372

995

1373

996

def _reset_approved(self):

1374

self.approved = None

997

self._approved = None

1375

998

return False

1376

999

1377

1000

def approve(self, value=True):

1378

self.approved = value

1379

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

1380

* 1000), self._reset_approved)

1381

1001

self.send_changedstate()

1002

self._approved = value

1003

gobject.timeout_add(_timedelta_to_milliseconds

1004

(self.approval_duration),

1005

self._reset_approved)

1006

1382

1007

1383

1008

## D-Bus methods, signals & properties

1384

1385

## Interfaces

1009

_interface = "se.recompile.Mandos.Client"

1386

1010

1387

1011

## Signals

1388

1012

1399

1023

pass

1400

1024

1401

1025

# PropertyChanged - signal

1402

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

1403

1026

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

1404

1027

def PropertyChanged(self, property, value):

1405

1028

"D-Bus signal"

1481

1104

access="readwrite")

1482

1105

def ApprovalDelay_dbus_property(self, value=None):

1483

1106

if value is None: # get

1484

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

1485

* 1000)

1107

return dbus.UInt64(self.approval_delay_milliseconds())

1486

1108

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

1487

1109

1488

1110

# ApprovalDuration - property

1490

1112

access="readwrite")

1491

1113

def ApprovalDuration_dbus_property(self, value=None):

1492

1114

if value is None: # get

1493

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

1494

* 1000)

1115

return dbus.UInt64(_timedelta_to_milliseconds(

1116

self.approval_duration))

1495

1117

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

1496

1118

1497

1119

# Name - property

1510

1132

def Host_dbus_property(self, value=None):

1511

1133

if value is None: # get

1512

1134

return dbus.String(self.host)

1513

self.host = str(value)

1135

self.host = value

1514

1136

1515

1137

# Created - property

1516

1138

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

1517

1139

def Created_dbus_property(self):

1518

return datetime_to_dbus(self.created)

1140

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

1519

1141

1520

1142

# LastEnabled - property

1521

1143

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

1542

1164

return

1543

1165

return datetime_to_dbus(self.last_checked_ok)

1544

1166

1545

# LastCheckerStatus - property

1546

@dbus_service_property(_interface, signature="n",

1547

access="read")

1548

def LastCheckerStatus_dbus_property(self):

1549

return dbus.Int16(self.last_checker_status)

1550

1551

1167

# Expires - property

1552

1168

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

1553

1169

def Expires_dbus_property(self):

1563

1179

access="readwrite")

1564

1180

def Timeout_dbus_property(self, value=None):

1565

1181

if value is None: # get

1566

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

1567

old_timeout = self.timeout

1182

return dbus.UInt64(self.timeout_milliseconds())

1568

1183

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

1569

# Reschedule disabling

1570

if self.enabled:

1571

now = datetime.datetime.utcnow()

1572

self.expires += self.timeout - old_timeout

1573

if self.expires <= now:

1574

# The timeout has passed

1575

self.disable()

1576

else:

1577

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

1578

is None):

1579

return

1580

gobject.source_remove(self.disable_initiator_tag)

1581

self.disable_initiator_tag = (

1582

gobject.timeout_add(

1583

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

1584

* 1000), self.disable))

1184

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

1185

return

1186

# Reschedule timeout

1187

gobject.source_remove(self.disable_initiator_tag)

1188

self.disable_initiator_tag = None

1189

self.expires = None

1190

time_to_die = (self.

1191

_timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow()))

1196

if time_to_die <= 0:

1197

# The timeout has passed

1198

self.disable()

1199

else:

1200

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

1201

+ datetime.timedelta(milliseconds =

1202

time_to_die))

1203

self.disable_initiator_tag = (gobject.timeout_add

1204

(time_to_die, self.disable))

1585

1205

1586

1206

# ExtendedTimeout - property

1587

1207

@dbus_service_property(_interface, signature="t",

1588

1208

access="readwrite")

1589

1209

def ExtendedTimeout_dbus_property(self, value=None):

1590

1210

if value is None: # get

1591

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

1592

* 1000)

1211

return dbus.UInt64(self.extended_timeout_milliseconds())

1593

1212

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

1594

1213

1595

1214

# Interval - property

1597

1216

access="readwrite")

1598

1217

def Interval_dbus_property(self, value=None):

1599

1218

if value is None: # get

1600

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

1219

return dbus.UInt64(self.interval_milliseconds())

1601

1220

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

1602

1221

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

1603

1222

return

1604

if self.enabled:

1605

# Reschedule checker run

1606

gobject.source_remove(self.checker_initiator_tag)

1607

self.checker_initiator_tag = (gobject.timeout_add

1608

(value, self.start_checker))

1609

self.start_checker() # Start one now, too

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

1610

1228

1611

1229

# Checker - property

1612

1230

@dbus_service_property(_interface, signature="s",

1614

1232

def Checker_dbus_property(self, value=None):

1615

1233

if value is None: # get

1616

1234

return dbus.String(self.checker_command)

1617

self.checker_command = str(value)

1235

self.checker_command = value

1618

1236

1619

1237

# CheckerRunning - property

1620

1238

@dbus_service_property(_interface, signature="b",

1636

1254

@dbus_service_property(_interface, signature="ay",

1637

1255

access="write", byte_arrays=True)

1638

1256

def Secret_dbus_property(self, value):

1639

self.secret = bytes(value)

1257

self.secret = str(value)

1640

1258

1641

1259

del _interface

1642

1260

1649

1267

raise KeyError()

1650

1268

1651

1269

def __getattribute__(self, name):

1652

if name == '_pipe':

1270

if(name == '_pipe'):

1653

1271

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

1654

1272

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

1655

1273

data = self._pipe.recv()

1662

1280

return func

1663

1281

1664

1282

def __setattr__(self, name, value):

1665

if name == '_pipe':

1283

if(name == '_pipe'):

1666

1284

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

1667

1285

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

1668

1286

1287

class ClientDBusTransitional(ClientDBus):

1288

__metaclass__ = AlternateDBusNamesMetaclass

1669

1289

1670

1290

class ClientHandler(socketserver.BaseRequestHandler, object):

1671

1291

"""A class to handle client connections.

1676

1296

def handle(self):

1677

1297

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

1678

1298

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

1679

str(self.client_address))

1299

unicode(self.client_address))

1680

1300

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

1681

1301

self.server.child_pipe.fileno())

1682

1302

1708

1328

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

1709

1329

try:

1710

1330

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

1711

raise RuntimeError(line)

1331

raise RuntimeError

1712

1332

except (ValueError, IndexError, RuntimeError) as error:

1713

1333

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

1714

1334

return

1754

1374

client.Rejected("Disabled")

1755

1375

return

1756

1376

1757

if client.approved or not client.approval_delay:

1377

if client._approved or not client.approval_delay:

1758

1378

#We are approved or approval is disabled

1759

1379

break

1760

elif client.approved is None:

1380

elif client._approved is None:

1761

1381

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

1762

1382

client.name)

1763

1383

if self.server.use_dbus:

1764

1384

# Emit D-Bus signal

1765

1385

client.NeedApproval(

1766

client.approval_delay.total_seconds()

1767

* 1000, client.approved_by_default)

1386

client.approval_delay_milliseconds(),

1387

client.approved_by_default)

1768

1388

else:

1769

1389

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

1770

1390

client.name)

1774

1394

return

1775

1395

1776

1396

#wait until timeout or approved

1397

#x = float(client

1398

# ._timedelta_to_milliseconds(delay))

1777

1399

time = datetime.datetime.now()

1778

1400

client.changedstate.acquire()

1779

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

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1780

1404

client.changedstate.release()

1781

1405

time2 = datetime.datetime.now()

1782

1406

if (time2 - time) >= delay:

1798

1422

try:

1799

1423

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

1800

1424

except gnutls.errors.GNUTLSError as error:

1801

logger.warning("gnutls send failed",

1802

exc_info=error)

1425

logger.warning("gnutls send failed")

1803

1426

return

1804

1427

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

1805

1428

sent, len(client.secret)

1807

1430

sent_size += sent

1808

1431

1809

1432

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

1810

# bump the timeout using extended_timeout

1811

client.bump_timeout(client.extended_timeout)

1433

# bump the timeout as if seen

1434

client.checked_ok(client.extended_timeout)

1812

1435

if self.server.use_dbus:

1813

1436

# Emit D-Bus signal

1814

1437

client.GotSecret()

1819

1442

try:

1820

1443

session.bye()

1821

1444

except gnutls.errors.GNUTLSError as error:

1822

logger.warning("GnuTLS bye failed",

1823

exc_info=error)

1445

logger.warning("GnuTLS bye failed")

1824

1446

1825

1447

@staticmethod

1826

1448

def peer_certificate(session):

1882

1504

# Convert the buffer to a Python bytestring

1883

1505

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

1884

1506

# Convert the bytestring to hexadecimal notation

1885

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

1507

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

1886

1508

return hex_fpr

1887

1509

1888

1510

1891

1513

def sub_process_main(self, request, address):

1892

1514

try:

1893

1515

self.finish_request(request, address)

1894

except Exception:

1516

except:

1895

1517

self.handle_error(request, address)

1896

1518

self.close_request(request)

1897

1519

1898

1520

def process_request(self, request, address):

1899

1521

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

1900

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

1901

args = (request, address))

1902

proc.start()

1903

return proc

1522

multiprocessing.Process(target = self.sub_process_main,

1523

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

1904

1524

1905

1525

1906

1526

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1912

1532

"""

1913

1533

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1914

1534

1915

proc = MultiprocessingMixIn.process_request(self, request,

1916

client_address)

1535

super(MultiprocessingMixInWithPipe,

1536

self).process_request(request, client_address)

1917

1537

self.child_pipe.close()

1918

self.add_pipe(parent_pipe, proc)

1538

self.add_pipe(parent_pipe)

1919

1539

1920

def add_pipe(self, parent_pipe, proc):

1540

def add_pipe(self, parent_pipe):

1921

1541

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

1922

raise NotImplementedError()

1542

raise NotImplementedError

1923

1543

1924

1544

1925

1545

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1932

1552

use_ipv6: Boolean; to use IPv6 or not

1933

1553

"""

1934

1554

def __init__(self, server_address, RequestHandlerClass,

1935

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

1936

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

1937

creating a new one with socket.socket().

1938

"""

1555

interface=None, use_ipv6=True):

1939

1556

self.interface = interface

1940

1557

if use_ipv6:

1941

1558

self.address_family = socket.AF_INET6

1942

if socketfd is not None:

1943

# Save the file descriptor

1944

self.socketfd = socketfd

1945

# Save the original socket.socket() function

1946

self.socket_socket = socket.socket

1947

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

1948

#

1949

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

1950

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

1951

# patching socket.socket.)

1952

#

1953

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

1954

@functools.wraps(socket.socket)

1955

def socket_wrapper(*args, **kwargs):

1956

# Restore original function so subsequent calls are

1957

# not affected.

1958

socket.socket = self.socket_socket

1959

del self.socket_socket

1960

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

1961

# saved file descriptor.

1962

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

1963

# Replace socket.socket() function with wrapper

1964

socket.socket = socket_wrapper

1965

# The socketserver.TCPServer.__init__ will call

1966

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

1967

# socket_wrapper(), if socketfd was set.

1968

1559

socketserver.TCPServer.__init__(self, server_address,

1969

1560

RequestHandlerClass)

1970

1971

1561

def server_bind(self):

1972

1562

"""This overrides the normal server_bind() function

1973

1563

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

1981

1571

try:

1982

1572

self.socket.setsockopt(socket.SOL_SOCKET,

1983

1573

SO_BINDTODEVICE,

1984

(self.interface + "\0")

1985

.encode("utf-8"))

1574

str(self.interface

1575

+ '\0'))

1986

1576

except socket.error as error:

1987

if error.errno == errno.EPERM:

1988

logger.error("No permission to bind to"

1989

" interface %s", self.interface)

1990

elif error.errno == errno.ENOPROTOOPT:

1577

if error[0] == errno.EPERM:

1578

logger.error("No permission to"

1579

" bind to interface %s",

1580

self.interface)

1581

elif error[0] == errno.ENOPROTOOPT:

1991

1582

logger.error("SO_BINDTODEVICE not available;"

1992

1583

" cannot bind to interface %s",

1993

1584

self.interface)

1994

elif error.errno == errno.ENODEV:

1995

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

1996

" cannot bind", self.interface)

1997

1585

else:

1998

1586

raise

1999

1587

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

2002

1590

if self.address_family == socket.AF_INET6:

2003

1591

any_address = "::" # in6addr_any

2004

1592

else:

2005

any_address = "0.0.0.0" # INADDR_ANY

1593

any_address = socket.INADDR_ANY

2006

1594

self.server_address = (any_address,

2007

1595

self.server_address[1])

2008

1596

elif not self.server_address[1]:

2029

1617

"""

2030

1618

def __init__(self, server_address, RequestHandlerClass,

2031

1619

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

2032

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

1620

gnutls_priority=None, use_dbus=True):

2033

1621

self.enabled = False

2034

1622

self.clients = clients

2035

1623

if self.clients is None:

2036

self.clients = {}

1624

self.clients = set()

2037

1625

self.use_dbus = use_dbus

2038

1626

self.gnutls_priority = gnutls_priority

2039

1627

IPv6_TCPServer.__init__(self, server_address,

2040

1628

RequestHandlerClass,

2041

1629

interface = interface,

2042

use_ipv6 = use_ipv6,

2043

socketfd = socketfd)

1630

use_ipv6 = use_ipv6)

2044

1631

def server_activate(self):

2045

1632

if self.enabled:

2046

1633

return socketserver.TCPServer.server_activate(self)

2047

2048

1634

def enable(self):

2049

1635

self.enabled = True

2050

2051

def add_pipe(self, parent_pipe, proc):

1636

def add_pipe(self, parent_pipe):

2052

1637

# Call "handle_ipc" for both data and EOF events

2053

1638

gobject.io_add_watch(parent_pipe.fileno(),

2054

1639

gobject.IO_IN | gobject.IO_HUP,

2055

1640

functools.partial(self.handle_ipc,

2056

1641

parent_pipe =

2057

parent_pipe,

2058

proc = proc))

2059

1642

parent_pipe))

1643

2060

1644

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

2061

proc = None, client_object=None):

2062

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

2063

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

2064

# Wait for other process to exit

2065

proc.join()

1645

client_object=None):

1646

condition_names = {

1647

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

1648

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

1649

# blocking).

1650

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

1651

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

1652

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

1653

# broken, usually for pipes and

1654

# sockets).

1655

}

1656

conditions_string = ' | '.join(name

1657

for cond, name in

1658

condition_names.iteritems()

1659

if cond & condition)

1660

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

1661

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

2066

1662

return False

2067

1663

2068

1664

# Read a request from the child

2073

1669

fpr = request[1]

2074

1670

address = request[2]

2075

1671

2076

for c in self.clients.itervalues():

1672

for c in self.clients:

2077

1673

if c.fingerprint == fpr:

2078

1674

client = c

2079

1675

break

2092

1688

functools.partial(self.handle_ipc,

2093

1689

parent_pipe =

2094

1690

parent_pipe,

2095

proc = proc,

2096

1691

client_object =

2097

1692

client))

2098

1693

parent_pipe.send(True)

2124

1719

return True

2125

1720

2126

1721

2127

def rfc3339_duration_to_delta(duration):

2128

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

2129

2130

>>> rfc3339_duration_to_delta("P7D")

2131

datetime.timedelta(7)

2132

>>> rfc3339_duration_to_delta("PT60S")

2133

datetime.timedelta(0, 60)

2134

>>> rfc3339_duration_to_delta("PT60M")

2135

datetime.timedelta(0, 3600)

2136

>>> rfc3339_duration_to_delta("PT24H")

2137

datetime.timedelta(1)

2138

>>> rfc3339_duration_to_delta("P1W")

2139

datetime.timedelta(7)

2140

>>> rfc3339_duration_to_delta("PT5M30S")

2141

datetime.timedelta(0, 330)

2142

>>> rfc3339_duration_to_delta("P1DT3M20S")

2143

datetime.timedelta(1, 200)

2144

"""

2145

2146

# Parsing an RFC 3339 duration with regular expressions is not

2147

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

2148

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

2149

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

2150

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

2151

# avoid excessive use of external libraries.

2152

2153

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

2154

Token = collections.namedtuple("Token",

2155

("regexp", # To match token; if

2156

# "value" is not None,

2157

# must have a "group"

2158

# containing digits

2159

"value", # datetime.timedelta or

2160

# None

2161

"followers")) # Tokens valid after

2162

# this token

2163

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

2164

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

2165

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

2166

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

2167

datetime.timedelta(seconds=1),

2168

frozenset((token_end,)))

2169

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

2170

datetime.timedelta(minutes=1),

2171

frozenset((token_second, token_end)))

2172

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

2173

datetime.timedelta(hours=1),

2174

frozenset((token_minute, token_end)))

2175

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

2176

None,

2177

frozenset((token_hour, token_minute,

2178

token_second)))

2179

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

2180

datetime.timedelta(days=1),

2181

frozenset((token_time, token_end)))

2182

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

2183

datetime.timedelta(weeks=4),

2184

frozenset((token_day, token_end)))

2185

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

2186

datetime.timedelta(weeks=52),

2187

frozenset((token_month, token_end)))

2188

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

2189

datetime.timedelta(weeks=1),

2190

frozenset((token_end,)))

2191

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

2192

frozenset((token_year, token_month,

2193

token_day, token_time,

2194

token_week)))

2195

# Define starting values

2196

value = datetime.timedelta() # Value so far

2197

found_token = None

2198

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

2199

s = duration # String left to parse

2200

# Loop until end token is found

2201

while found_token is not token_end:

2202

# Search for any currently valid tokens

2203

for token in followers:

2204

match = token.regexp.match(s)

2205

if match is not None:

2206

# Token found

2207

if token.value is not None:

2208

# Value found, parse digits

2209

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

2210

# Add to value so far

2211

value += factor * token.value

2212

# Strip token from string

2213

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

2214

# Go to found token

2215

found_token = token

2216

# Set valid next tokens

2217

followers = found_token.followers

2218

break

2219

else:

2220

# No currently valid tokens were found

2221

raise ValueError("Invalid RFC 3339 duration")

2222

# End token found

2223

return value

2224

2225

2226

1722

def string_to_delta(interval):

2227

1723

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

2228

1724

2239

1735

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

2240

1736

datetime.timedelta(0, 330)

2241

1737

"""

2242

2243

try:

2244

return rfc3339_duration_to_delta(interval)

2245

except ValueError:

2246

pass

2247

2248

1738

timevalue = datetime.timedelta(0)

2249

1739

for s in interval.split():

2250

1740

try:

2251

suffix = s[-1]

1741

suffix = unicode(s[-1])

2252

1742

value = int(s[:-1])

2253

1743

if suffix == "d":

2254

1744

delta = datetime.timedelta(value)

2261

1751

elif suffix == "w":

2262

1752

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

2263

1753

else:

2264

raise ValueError("Unknown suffix {!r}"

2265

.format(suffix))

2266

except IndexError as e:

1754

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

1755

except (ValueError, IndexError) as e:

2267

1756

raise ValueError(*(e.args))

2268

1757

timevalue += delta

2269

1758

return timevalue

2270

1759

2271

1760

1761

def if_nametoindex(interface):

1762

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

1763

1764

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

1765

global if_nametoindex

1766

try:

1767

if_nametoindex = (ctypes.cdll.LoadLibrary

1768

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

1769

.if_nametoindex)

1770

except (OSError, AttributeError):

1771

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

1772

def if_nametoindex(interface):

1773

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

1774

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

1775

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

1776

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1777

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

1778

interface))

1779

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

1780

ifreq[16:20])[0]

1781

return interface_index

1782

return if_nametoindex(interface)

1783

1784

2272

1785

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

2273

1786

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

2274

1787

2282

1795

sys.exit()

2283

1796

if not noclose:

2284

1797

# Close all standard open file descriptors

2285

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

1798

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

2286

1799

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

2287

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

2288

.format(os.devnull))

1800

raise OSError(errno.ENODEV,

1801

"%s not a character device"

1802

% os.path.devnull)

2289

1803

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

2290

1804

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

2291

1805

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

2300

1814

2301

1815

parser = argparse.ArgumentParser()

2302

1816

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

2303

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

1817

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

2304

1818

help="show version number and exit")

2305

1819

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

2306

1820

help="Bind to interface IF")

2312

1826

help="Run self-test")

2313

1827

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

2314

1828

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

2315

" to terminal", default=None)

1829

" to terminal")

2316

1830

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

2317

1831

help="Debug level for stdout output")

2318

1832

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

2325

1839

" files")

2326

1840

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

2327

1841

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

2328

" system bus interface", default=None)

1842

" system bus interface")

2329

1843

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

2330

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

2331

default=None)

2332

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

2333

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

2334

" state", default=None)

2335

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

2336

help="Specify a file descriptor to a network"

2337

" socket to use instead of creating one")

2338

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

2339

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

2340

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

2341

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

2342

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

2343

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

2344

default=None)

2345

1844

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

2346

1845

options = parser.parse_args()

2347

1846

2348

1847

if options.check:

2349

1848

import doctest

2350

fail_count, test_count = doctest.testmod()

2351

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

1849

doctest.testmod()

1850

sys.exit()

2352

1851

2353

1852

# Default values for config file for server-global settings

2354

1853

server_defaults = { "interface": "",

2356

1855

"port": "",

2357

1856

"debug": "False",

2358

1857

"priority":

2359

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

2360

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

1858

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

2361

1859

"servicename": "Mandos",

2362

1860

"use_dbus": "True",

2363

1861

"use_ipv6": "True",

2364

1862

"debuglevel": "",

2365

"restore": "True",

2366

"socket": "",

2367

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

2368

"foreground": "False",

2369

"zeroconf": "True",

2370

1863

}

2371

1864

2372

1865

# Parse config file for server-global settings

2377

1870

# Convert the SafeConfigParser object to a dict

2378

1871

server_settings = server_config.defaults()

2379

1872

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

2380

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

1873

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

2381

1874

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

2382

1875

option)

2383

1876

if server_settings["port"]:

2384

1877

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

2385

1878

"port")

2386

if server_settings["socket"]:

2387

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

2388

"socket")

2389

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

2390

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

2391

# happen with a supplied network socket.

2392

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

2393

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

2394

["socket"])

2395

1879

del server_config

2396

1880

2397

1881

# Override the settings from the config file with command line

2398

1882

# options, if set.

2399

1883

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

2400

1884

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

2401

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

2402

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

1885

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

2403

1886

value = getattr(options, option)

2404

1887

if value is not None:

2405

1888

server_settings[option] = value

2406

1889

del options

2407

1890

# Force all strings to be unicode

2408

1891

for option in server_settings.keys():

2409

if isinstance(server_settings[option], bytes):

2410

server_settings[option] = (server_settings[option]

2411

.decode("utf-8"))

2412

# Force all boolean options to be boolean

2413

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

2414

"foreground", "zeroconf"):

2415

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

2416

# Debug implies foreground

2417

if server_settings["debug"]:

2418

server_settings["foreground"] = True

1892

if type(server_settings[option]) is str:

1893

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

2419

1894

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

2420

1895

2421

1896

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

2422

1897

2423

if (not server_settings["zeroconf"] and

2424

not (server_settings["port"]

2425

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

2426

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

2427

" Zeroconf")

2428

2429

1898

# For convenience

2430

1899

debug = server_settings["debug"]

2431

1900

debuglevel = server_settings["debuglevel"]

2432

1901

use_dbus = server_settings["use_dbus"]

2433

1902

use_ipv6 = server_settings["use_ipv6"]

2434

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

2435

stored_state_file)

2436

foreground = server_settings["foreground"]

2437

zeroconf = server_settings["zeroconf"]

2438

2439

if debug:

2440

initlogger(debug, logging.DEBUG)

2441

else:

2442

if not debuglevel:

2443

initlogger(debug)

2444

else:

2445

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

2446

initlogger(debug, level)

2447

1903

2448

1904

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

2449

1905

syslogger.setFormatter(logging.Formatter

2450

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

2451

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

2452

.format(server_settings

2453

["servicename"])))

1906

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

1907

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

1908

% server_settings["servicename"]))

2454

1909

2455

1910

# Parse config file with clients

2456

client_config = configparser.SafeConfigParser(Client

2457

.client_defaults)

1911

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

1912

"extended_timeout": "15m",

1913

"interval": "2m",

1914

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

1915

"host": "",

1916

"approval_delay": "0s",

1917

"approval_duration": "1s",

1918

}

1919

client_config = configparser.SafeConfigParser(client_defaults)

2458

1920

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

2459

1921

"clients.conf"))

2460

1922

2461

1923

global mandos_dbus_service

2462

1924

mandos_dbus_service = None

2463

1925

2464

socketfd = None

2465

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

2466

socketfd = server_settings["socket"]

2467

1926

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

2468

1927

server_settings["port"]),

2469

1928

ClientHandler,

2472

1931

use_ipv6=use_ipv6,

2473

1932

gnutls_priority=

2474

1933

server_settings["priority"],

2475

use_dbus=use_dbus,

2476

socketfd=socketfd)

2477

if not foreground:

2478

pidfilename = "/run/mandos.pid"

2479

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

2480

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

2481

pidfile = None

1934

use_dbus=use_dbus)

1935

if not debug:

1936

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

2482

1937

try:

2483

1938

pidfile = open(pidfilename, "w")

2484

except IOError as e:

2485

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

2486

exc_info=e)

1939

except IOError:

1940

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

2487

1941

2488

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

1942

try:

1943

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

1944

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

1945

except KeyError:

2489

1946

try:

2490

uid = pwd.getpwnam(name).pw_uid

2491

gid = pwd.getpwnam(name).pw_gid

2492

break

1947

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

1948

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

2493

1949

except KeyError:

2494

continue

2495

else:

2496

uid = 65534

2497

gid = 65534

1950

try:

1951

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

1952

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

1953

except KeyError:

1954

uid = 65534

1955

gid = 65534

2498

1956

try:

2499

1957

os.setgid(gid)

2500

1958

os.setuid(uid)

2501

1959

except OSError as error:

2502

if error.errno != errno.EPERM:

2503

raise

1960

if error[0] != errno.EPERM:

1961

raise error

1962

1963

if not debug and not debuglevel:

1964

syslogger.setLevel(logging.WARNING)

1965

console.setLevel(logging.WARNING)

1966

if debuglevel:

1967

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

1968

syslogger.setLevel(level)

1969

console.setLevel(level)

2504

1970

2505

1971

if debug:

2506

1972

# Enable all possible GnuTLS debugging

2517

1983

.gnutls_global_set_log_function(debug_gnutls))

2518

1984

2519

1985

# Redirect stdin so all checkers get /dev/null

2520

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

1986

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

2521

1987

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

2522

1988

if null > 2:

2523

1989

os.close(null)

1990

else:

1991

# No console logging

1992

logger.removeHandler(console)

2524

1993

2525

1994

# Need to fork before connecting to D-Bus

2526

if not foreground:

1995

if not debug:

2527

1996

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

2528

1997

daemon()

2529

1998

2530

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

2531

# need to inform gobject that threads will be used.

2532

gobject.threads_init()

2533

2534

1999

global main_loop

2535

2000

# From the Avahi example code

2536

DBusGMainLoop(set_as_default=True)

2001

DBusGMainLoop(set_as_default=True )

2537

2002

main_loop = gobject.MainLoop()

2538

2003

bus = dbus.SystemBus()

2539

2004

# End of Avahi example code

2545

2010

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

2546

2011

do_not_queue=True))

2547

2012

except dbus.exceptions.NameExistsException as e:

2548

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

2013

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

2549

2014

use_dbus = False

2550

2015

server_settings["use_dbus"] = False

2551

2016

tcp_server.use_dbus = False

2552

if zeroconf:

2553

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2554

service = AvahiServiceToSyslog(name =

2555

server_settings["servicename"],

2556

servicetype = "_mandos._tcp",

2557

protocol = protocol, bus = bus)

2558

if server_settings["interface"]:

2559

service.interface = (if_nametoindex

2560

(server_settings["interface"]

2561

.encode("utf-8")))

2017

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2018

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

2019

servicetype = "_mandos._tcp",

2020

protocol = protocol, bus = bus)

2021

if server_settings["interface"]:

2022

service.interface = (if_nametoindex

2023

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

2562

2024

2563

2025

global multiprocessing_manager

2564

2026

multiprocessing_manager = multiprocessing.Manager()

2565

2027

2566

2028

client_class = Client

2567

2029

if use_dbus:

2568

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

2569

2570

client_settings = Client.config_parser(client_config)

2571

old_client_settings = {}

2572

clients_data = {}

2573

2574

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

2575

global wnull

2576

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

2577

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

2578

# mode

2579

if debug or not foreground:

2580

wnull.close()

2581

2582

# Get client data and settings from last running state.

2583

if server_settings["restore"]:

2584

try:

2585

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

2586

clients_data, old_client_settings = (pickle.load

2587

(stored_state))

2588

os.remove(stored_state_path)

2589

except IOError as e:

2590

if e.errno == errno.ENOENT:

2591

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

2592

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

2593

else:

2594

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

2595

exc_info=e)

2596

raise

2597

except EOFError as e:

2598

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

2599

"EOFError:", exc_info=e)

2600

2601

with PGPEngine() as pgp:

2602

for client_name, client in clients_data.items():

2603

# Skip removed clients

2604

if client_name not in client_settings:

2605

continue

2606

2607

# Decide which value to use after restoring saved state.

2608

# We have three different values: Old config file,

2609

# new config file, and saved state.

2610

# New config value takes precedence if it differs from old

2611

# config value, otherwise use saved state.

2612

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

2613

try:

2614

# For each value in new config, check if it

2615

# differs from the old config value (Except for

2616

# the "secret" attribute)

2617

if (name != "secret" and

2618

value != old_client_settings[client_name]

2619

[name]):

2620

client[name] = value

2621

except KeyError:

2622

pass

2623

2624

# Clients who has passed its expire date can still be

2625

# enabled if its last checker was successful. Clients

2626

# whose checker succeeded before we stored its state is

2627

# assumed to have successfully run all checkers during

2628

# downtime.

2629

if client["enabled"]:

2630

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

2631

if not client["last_checked_ok"]:

2632

logger.warning(

2633

"disabling client {} - Client never "

2634

"performed a successful checker"

2635

.format(client_name))

2636

client["enabled"] = False

2637

elif client["last_checker_status"] != 0:

2638

logger.warning(

2639

"disabling client {} - Client last"

2640

" checker failed with error code {}"

2641

.format(client_name,

2642

client["last_checker_status"]))

2643

client["enabled"] = False

2644

else:

2645

client["expires"] = (datetime.datetime

2646

.utcnow()

2647

+ client["timeout"])

2648

logger.debug("Last checker succeeded,"

2649

" keeping {} enabled"

2650

.format(client_name))

2030

client_class = functools.partial(ClientDBusTransitional,

2031

bus = bus)

2032

def client_config_items(config, section):

2033

special_settings = {

2034

"approved_by_default":

2035

lambda: config.getboolean(section,

2036

"approved_by_default"),

2037

}

2038

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

2651

2039

try:

2652

client["secret"] = (

2653

pgp.decrypt(client["encrypted_secret"],

2654

client_settings[client_name]

2655

["secret"]))

2656

except PGPError:

2657

# If decryption fails, we use secret from new settings

2658

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

2659

.format(client_name))

2660

client["secret"] = (

2661

client_settings[client_name]["secret"])

2662

2663

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

2664

for client_name in (set(old_client_settings)

2665

- set(client_settings)):

2666

del clients_data[client_name]

2667

for client_name in (set(client_settings)

2668

- set(old_client_settings)):

2669

clients_data[client_name] = client_settings[client_name]

2670

2671

# Create all client objects

2672

for client_name, client in clients_data.items():

2673

tcp_server.clients[client_name] = client_class(

2674

name = client_name, settings = client,

2675

server_settings = server_settings)

2676

2040

yield (name, special_settings[name]())

2041

except KeyError:

2042

yield (name, value)

2043

2044

tcp_server.clients.update(set(

2045

client_class(name = section,

2046

config= dict(client_config_items(

2047

client_config, section)))

2048

for section in client_config.sections()))

2677

2049

if not tcp_server.clients:

2678

2050

logger.warning("No clients defined")

2679

2680

if not foreground:

2681

if pidfile is not None:

2682

try:

2683

with pidfile:

2684

pid = os.getpid()

2685

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

2686

except IOError:

2687

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

2688

pidfilename, pid)

2689

del pidfile

2051

2052

if not debug:

2053

try:

2054

with pidfile:

2055

pid = os.getpid()

2056

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

2057

del pidfile

2058

except IOError:

2059

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

2060

pidfilename, pid)

2061

except NameError:

2062

# "pidfile" was never created

2063

pass

2690

2064

del pidfilename

2065

2066

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

2691

2067

2692

2068

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

2693

2069

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

2694

2070

2695

2071

if use_dbus:

2696

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

2697

"se.bsnet.fukt.Mandos"})

2698

class MandosDBusService(DBusObjectWithProperties):

2072

class MandosDBusService(dbus.service.Object):

2699

2073

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

2700

2074

def __init__(self):

2701

2075

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

2702

2076

_interface = "se.recompile.Mandos"

2703

2077

2704

@dbus_interface_annotations(_interface)

2705

def _foo(self):

2706

return { "org.freedesktop.DBus.Property"

2707

".EmitsChangedSignal":

2708

"false"}

2709

2710

2078

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

2711

2079

def ClientAdded(self, objpath):

2712

2080

"D-Bus signal"

2726

2094

def GetAllClients(self):

2727

2095

"D-Bus method"

2728

2096

return dbus.Array(c.dbus_object_path

2729

for c in

2730

tcp_server.clients.itervalues())

2097

for c in tcp_server.clients)

2731

2098

2732

2099

@dbus.service.method(_interface,

2733

2100

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

2734

2101

def GetAllClientsWithProperties(self):

2735

2102

"D-Bus method"

2736

2103

return dbus.Dictionary(

2737

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

2738

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

2104

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

2105

for c in tcp_server.clients),

2739

2106

signature="oa{sv}")

2740

2107

2741

2108

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

2742

2109

def RemoveClient(self, object_path):

2743

2110

"D-Bus method"

2744

for c in tcp_server.clients.itervalues():

2111

for c in tcp_server.clients:

2745

2112

if c.dbus_object_path == object_path:

2746

del tcp_server.clients[c.name]

2113

tcp_server.clients.remove(c)

2747

2114

c.remove_from_connection()

2748

2115

# Don't signal anything except ClientRemoved

2749

2116

c.disable(quiet=True)

2754

2121

2755

2122

del _interface

2756

2123

2757

mandos_dbus_service = MandosDBusService()

2124

class MandosDBusServiceTransitional(MandosDBusService):

2125

__metaclass__ = AlternateDBusNamesMetaclass

2126

mandos_dbus_service = MandosDBusServiceTransitional()

2758

2127

2759

2128

def cleanup():

2760

2129

"Cleanup function; run on exit"

2761

if zeroconf:

2762

service.cleanup()

2763

2764

multiprocessing.active_children()

2765

wnull.close()

2766

if not (tcp_server.clients or client_settings):

2767

return

2768

2769

# Store client before exiting. Secrets are encrypted with key

2770

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

2771

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

2772

clients = {}

2773

with PGPEngine() as pgp:

2774

for client in tcp_server.clients.itervalues():

2775

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

2776

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

2777

key)

2778

client_dict = {}

2779

2780

# A list of attributes that can not be pickled

2781

# + secret.

2782

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

2783

"checker", "server_settings" }

2784

for name, typ in (inspect.getmembers

2785

(dbus.service.Object)):

2786

exclude.add(name)

2787

2788

client_dict["encrypted_secret"] = (client

2789

.encrypted_secret)

2790

for attr in client.client_structure:

2791

if attr not in exclude:

2792

client_dict[attr] = getattr(client, attr)

2793

2794

clients[client.name] = client_dict

2795

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

2796

2797

try:

2798

with (tempfile.NamedTemporaryFile

2799

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

2800

dir=os.path.dirname(stored_state_path),

2801

delete=False)) as stored_state:

2802

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

2803

tempname=stored_state.name

2804

os.rename(tempname, stored_state_path)

2805

except (IOError, OSError) as e:

2806

if not debug:

2807

try:

2808

os.remove(tempname)

2809

except NameError:

2810

pass

2811

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

2812

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

2813

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

2814

else:

2815

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

2816

exc_info=e)

2817

raise

2818

2819

# Delete all clients, and settings from config

2130

service.cleanup()

2131

2820

2132

while tcp_server.clients:

2821

name, client = tcp_server.clients.popitem()

2133

client = tcp_server.clients.pop()

2822

2134

if use_dbus:

2823

2135

client.remove_from_connection()

2136

client.disable_hook = None

2824

2137

# Don't signal anything except ClientRemoved

2825

2138

client.disable(quiet=True)

2826

2139

if use_dbus:

2828

2141

mandos_dbus_service.ClientRemoved(client

2829

2142

.dbus_object_path,

2830

2143

client.name)

2831

client_settings.clear()

2832

2144

2833

2145

atexit.register(cleanup)

2834

2146

2835

for client in tcp_server.clients.itervalues():

2147

for client in tcp_server.clients:

2836

2148

if use_dbus:

2837

2149

# Emit D-Bus signal

2838

2150

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2839

# Need to initiate checking of clients

2840

if client.enabled:

2841

client.init_checker()

2151

client.enable()

2842

2152

2843

2153

tcp_server.enable()

2844

2154

tcp_server.server_activate()

2845

2155

2846

2156

# Find out what port we got

2847

if zeroconf:

2848

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

2157

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

2849

2158

if use_ipv6:

2850

2159

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

2851

" flowinfo %d, scope_id %d",

2852

*tcp_server.socket.getsockname())

2160

" flowinfo %d, scope_id %d"

2161

% tcp_server.socket.getsockname())

2853

2162

else: # IPv4

2854

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

2855

*tcp_server.socket.getsockname())

2163

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

2164

% tcp_server.socket.getsockname())

2856

2165

2857

2166

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

2858

2167

2859

2168

try:

2860

if zeroconf:

2861

# From the Avahi example code

2862

try:

2863

service.activate()

2864

except dbus.exceptions.DBusException as error:

2865

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

2866

cleanup()

2867

sys.exit(1)

2868

# End of Avahi example code

2169

# From the Avahi example code

2170

try:

2171

service.activate()

2172

except dbus.exceptions.DBusException as error:

2173

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

2174

cleanup()

2175

sys.exit(1)

2176

# End of Avahi example code

2869

2177

2870

2178

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

2871

2179

lambda *args, **kwargs:

2875

2183

logger.debug("Starting main loop")

2876

2184

main_loop.run()

2877

2185

except AvahiError as error:

2878

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

2186

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

2879

2187

cleanup()

2880

2188

sys.exit(1)

2881

2189

except KeyboardInterrupt:

2886

2194

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

2887

2195

cleanup()

2888

2196

2197

2889

2198

if __name__ == '__main__':

2890

2199

main()