/mandos/trunk : revision 738.1.1

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#!/usr/bin/python

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#!/usr/bin/python2.7

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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 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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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.4.1"

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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 = (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 = None

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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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(level=logging.WARNING):

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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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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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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 CryptoError(Exception):

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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 Crypto(object):

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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.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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self.gnupg.options.extra_args.extend(['--force-mdc',

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'--quiet'])

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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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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 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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return b"mandos" + binascii.hexlify(password)

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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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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--symmetric'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise CryptoError(e)

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self.gnupg.passphrase = None

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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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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--decrypt'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin'] ) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise CryptoError(e)

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self.gnupg.passphrase = None

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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class AvahiError(Exception):

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

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self.value = value

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

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**kwargs)

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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def rename(self, remove=True):

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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 = unicode(self.server

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.GetAlternativeServiceName(self.name))

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

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self.name)

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self.remove()

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if remove:

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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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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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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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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self.rename()

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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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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def cleanup(self):

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

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if self.group is not None:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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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)

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

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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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('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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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, or None.

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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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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 password has been sent

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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

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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, 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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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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self.name = name

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if config is None:

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config = {}

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.items():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

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

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if "secret" in config:

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

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elif "secfile" in config:

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

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(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

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

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self.created = datetime.datetime.utcnow()

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self.enabled = config.get("enabled", True)

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self.last_approval_request = None

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if self.enabled:

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self.last_enabled = datetime.datetime.utcnow()

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else:

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self.last_enabled = None

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self.last_checked_ok = None

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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if self.enabled:

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

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else:

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self.expires = None

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

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self.current_checker_command = None

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self._approved = None

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

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True)

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self.approved = None

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self.approvals_pending = 0

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self.approval_delay = string_to_delta(

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config["approval_delay"])

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self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

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.Condition(multiprocessing_manager

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.Lock()))

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

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# Already enabled

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return

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self.send_changedstate()

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

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

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if not quiet:

542

self.send_changedstate()

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if not quiet:

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

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

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

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

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

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

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

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if not quiet:

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self.send_changedstate()

554

600

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

555

601

return False

556

602

560

606

def init_checker(self):

561

607

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

562

608

# and every interval from then on.

609

if self.checker_initiator_tag is not None:

610

gobject.source_remove(self.checker_initiator_tag)

563

611

self.checker_initiator_tag = (gobject.timeout_add

564

(self.interval_milliseconds(),

612

(int(self.interval

613

.total_seconds() * 1000),

565

614

self.start_checker))

566

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)

567

618

self.disable_initiator_tag = (gobject.timeout_add

568

(self.timeout_milliseconds(),

569

self.disable))

619

(int(self.timeout

620

.total_seconds() * 1000),

621

self.disable))

570

622

# Also start a new checker *right now*.

571

623

self.start_checker()

572

624

575

627

self.checker_callback_tag = None

576

628

self.checker = None

577

629

if os.WIFEXITED(condition):

578

self.last_checker_status = os.WEXITSTATUS(condition)

630

self.last_checker_status = os.WEXITSTATUS(condition)

579

631

if self.last_checker_status == 0:

580

632

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

581

633

vars(self))

588

640

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

589

641

vars(self))

590

642

591

def checked_ok(self, timeout=None):

592

"""Bump up the timeout for this client.

593

594

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

595

alive and well.

596

"""

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."""

597

651

if timeout is None:

598

652

timeout = self.timeout

599

self.last_checked_ok = datetime.datetime.utcnow()

600

653

if self.disable_initiator_tag is not None:

601

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

602

656

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

603

657

self.disable_initiator_tag = (gobject.timeout_add

604

(_timedelta_to_milliseconds

605

(timeout), self.disable))

658

(int(timeout.total_seconds()

659

* 1000), self.disable))

606

660

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

607

661

608

662

def need_approval(self):

614

668

If a checker already exists, leave it running and do

615

669

nothing."""

616

670

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

617

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

618

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

619

# client would inevitably timeout, since no checker would get

620

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

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

621

675

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

622

676

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

623

677

# should be.

625

679

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

626

680

try:

627

681

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

628

except (AttributeError, OSError) as error:

629

if (isinstance(error, OSError)

630

and error.errno != errno.ECHILD):

631

raise error

682

except AttributeError:

683

pass

684

except OSError as error:

685

if error.errno != errno.ECHILD:

686

raise

632

687

else:

633

688

if pid:

634

689

logger.warning("Checker was a zombie")

637

692

self.current_checker_command)

638

693

# Start a new checker if needed

639

694

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 }

640

699

try:

641

# In case checker_command has exactly one % operator

642

command = self.checker_command % self.host

643

except TypeError:

644

# Escape attributes for the shell

645

escaped_attrs = dict(

646

(attr,

647

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

648

errors=

649

'replace')))

650

for attr in

651

self.runtime_expansions)

652

653

try:

654

command = self.checker_command % escaped_attrs

655

except TypeError as error:

656

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

657

' %s', self.checker_command, error)

658

return True # Try again later

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

659

705

self.current_checker_command = command

660

706

try:

661

707

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

664

710

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

665

711

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

666

712

# 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 })

667

721

self.checker = subprocess.Popen(command,

668

722

close_fds=True,

669

shell=True, cwd="/")

670

self.checker_callback_tag = (gobject.child_watch_add

671

(self.checker.pid,

672

self.checker_callback,

673

data=command))

674

# The checker may have completed before the gobject

675

# watch was added. Check for this.

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:

676

736

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

677

if pid:

678

gobject.source_remove(self.checker_callback_tag)

679

self.checker_callback(pid, status, command)

680

737

except OSError as error:

681

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

682

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)

683

747

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

684

748

return True

685

749

692

756

return

693

757

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

694

758

try:

695

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

759

self.checker.terminate()

696

760

#time.sleep(0.5)

697

761

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

698

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

762

# self.checker.kill()

699

763

except OSError as error:

700

764

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

701

765

raise

718

782

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

719

783

if byte_arrays and signature != "ay":

720

784

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

721

" signature %r" % signature)

785

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

722

786

def decorator(func):

723

787

func._dbus_is_property = True

724

788

func._dbus_interface = dbus_interface

732

796

return decorator

733

797

734

798

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

735

836

class DBusPropertyException(dbus.exceptions.DBusException):

736

837

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

737

838

"""

738

def __unicode__(self):

739

return unicode(str(self))

740

839

pass

741

840

742

841

class DBusPropertyAccessException(DBusPropertyException):

743

842

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

760

859

"""

761

860

762

861

@staticmethod

763

def _is_dbus_property(obj):

764

return getattr(obj, "_dbus_is_property", False)

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)

765

870

766

def _get_all_dbus_properties(self):

871

def _get_all_dbus_things(self, thing):

767

872

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

768

873

"""

769

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

874

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

875

name),

876

athing.__get__(self))

770

877

for cls in self.__class__.__mro__

771

for name, prop in

772

inspect.getmembers(cls, self._is_dbus_property))

878

for name, athing in

879

inspect.getmembers(cls,

880

self._is_dbus_thing(thing)))

773

881

774

882

def _get_dbus_property(self, interface_name, property_name):

775

883

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

777

885

"""

778

886

for cls in self.__class__.__mro__:

779

887

for name, value in (inspect.getmembers

780

(cls, self._is_dbus_property)):

888

(cls,

889

self._is_dbus_thing("property"))):

781

890

if (value._dbus_name == property_name

782

891

and value._dbus_interface == interface_name):

783

892

return value.__get__(self)

811

920

# The byte_arrays option is not supported yet on

812

921

# signatures other than "ay".

813

922

if prop._dbus_signature != "ay":

814

raise ValueError

815

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

816

for byte in value))

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))

817

928

prop(value)

818

929

819

930

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

825

936

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

826

937

"""

827

938

properties = {}

828

for name, prop in self._get_all_dbus_properties():

939

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

829

940

if (interface_name

830

941

and interface_name != prop._dbus_interface):

831

942

# Interface non-empty but did not match

841

952

value.variant_level+1)

842

953

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

843

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

962

844

963

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

845

964

out_signature="s",

846

965

path_keyword='object_path',

847

966

connection_keyword='connection')

848

967

def Introspect(self, object_path, connection):

849

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

968

"""Overloading of standard D-Bus method.

969

970

Inserts property tags and interface annotation tags.

850

971

"""

851

972

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

852

973

connection)

859

980

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

860

981

return e

861

982

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

983

# Add property tags

862

984

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

863

985

for name, prop

864

in self._get_all_dbus_properties()

986

in self._get_all_dbus_things("property")

865

987

if prop._dbus_interface

866

988

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

867

989

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)

868

1021

# Add the names to the return values for the

869

1022

# "org.freedesktop.DBus.Properties" methods

870

1023

if (if_tag.getAttribute("name")

885

1038

except (AttributeError, xml.dom.DOMException,

886

1039

xml.parsers.expat.ExpatError) as error:

887

1040

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

888

error)

1041

exc_info=error)

889

1042

return xmlstring

890

1043

891

1044

892

def datetime_to_dbus (dt, variant_level=0):

1045

def datetime_to_dbus(dt, variant_level=0):

893

1046

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

894

1047

if dt is None:

895

1048

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

897

1050

variant_level=variant_level)

898

1051

899

1052

900

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

901

.__metaclass__):

902

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

903

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

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).

904

1075

"""

905

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

906

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

907

# methods, signals, or properties in them

908

for base in (b for b in bases

909

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

910

# Go though all attributes of the base class

911

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

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):

912

1083

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

913

1084

# with the wrong interface name

914

1085

if (not hasattr(attribute, "_dbus_interface")

915

1086

or not attribute._dbus_interface

916

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

1087

.startswith(orig_interface_name)):

917

1088

continue

918

1089

# Create an alternate D-Bus interface name based on

919

1090

# the current name

920

1091

alt_interface = (attribute._dbus_interface

921

.replace("se.recompile.Mandos",

922

"se.bsnet.fukt.Mandos"))

1092

.replace(orig_interface_name,

1093

alt_interface_name))

1094

interface_names.add(alt_interface)

923

1095

# Is this a D-Bus signal?

924

1096

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

925

# Extract the original non-method function by

926

# black magic

1097

# Extract the original non-method undecorated

1098

# function by black magic

927

1099

nonmethod_func = (dict(

928

1100

zip(attribute.func_code.co_freevars,

929

1101

attribute.__closure__))["func"]

940

1112

nonmethod_func.func_name,

941

1113

nonmethod_func.func_defaults,

942

1114

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

943

1121

# Define a creator of a function to call both the

944

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

945

# signals gets sent when the function is called

1122

# original and alternate functions, so both the

1123

# original and alternate signals gets sent when

1124

# the function is called

946

1125

def fixscope(func1, func2):

947

1126

"""This function is a scope container to pass

948

1127

func1 and func2 to the "call_both" function

955

1134

return call_both

956

1135

# Create the "call_both" function and add it to

957

1136

# the class

958

attr[attrname] = fixscope(attribute,

959

new_function)

1137

attr[attrname] = fixscope(attribute, new_function)

960

1138

# Is this a D-Bus method?

961

1139

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

962

1140

# Create a new, but exactly alike, function

973

1151

attribute.func_name,

974

1152

attribute.func_defaults,

975

1153

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

976

1160

# Is this a D-Bus property?

977

1161

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

978

1162

# Create a new, but exactly alike, function

992

1176

attribute.func_name,

993

1177

attribute.func_defaults,

994

1178

attribute.func_closure)))

995

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

996

997

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"})

998

1224

class ClientDBus(Client, DBusObjectWithProperties):

999

1225

"""A Client class using D-Bus

1000

1226

1006

1232

runtime_expansions = (Client.runtime_expansions

1007

1233

+ ("dbus_object_path",))

1008

1234

1235

_interface = "se.recompile.Mandos.Client"

1236

1009

1237

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

1010

1238

1011

1239

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

1012

1240

self.bus = bus

1013

1241

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

1014

1015

self._approvals_pending = 0

1016

1242

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

1017

1243

# the D-Bus

1018

client_object_name = unicode(self.name).translate(

1244

client_object_name = str(self.name).translate(

1019

1245

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

1020

1246

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

1021

1247

self.dbus_object_path = (dbus.ObjectPath

1022

1248

("/clients/" + client_object_name))

1023

1249

DBusObjectWithProperties.__init__(self, self.bus,

1024

1250

self.dbus_object_path)

1025

1251

1026

1252

def notifychangeproperty(transform_func,

1027

1253

dbus_name, type_func=lambda x: x,

1028

variant_level=1):

1254

variant_level=1, invalidate_only=False,

1255

_interface=_interface):

1029

1256

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

1030

1257

its changes to DBus.

1031

1258

1036

1263

to the D-Bus. Default: no transform

1037

1264

variant_level: D-Bus variant level. Default: 1

1038

1265

"""

1039

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

1266

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

1040

1267

def setter(self, value):

1041

1268

if hasattr(self, "dbus_object_path"):

1042

1269

if (not hasattr(self, attrname) or

1043

1270

type_func(getattr(self, attrname, None))

1044

1271

!= type_func(value)):

1045

dbus_value = transform_func(type_func(value),

1046

variant_level

1047

=variant_level)

1048

self.PropertyChanged(dbus.String(dbus_name),

1049

dbus_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())

1050

1287

setattr(self, attrname, value)

1051

1288

1052

1289

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

1053

1290

1054

1055

1291

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1056

1292

approvals_pending = notifychangeproperty(dbus.Boolean,

1057

1293

"ApprovalPending",

1064

1300

checker is not None)

1065

1301

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1066

1302

"LastCheckedOK")

1303

last_checker_status = notifychangeproperty(dbus.Int16,

1304

"LastCheckerStatus")

1067

1305

last_approval_request = notifychangeproperty(

1068

1306

datetime_to_dbus, "LastApprovalRequest")

1069

1307

approved_by_default = notifychangeproperty(dbus.Boolean,

1070

1308

"ApprovedByDefault")

1071

approval_delay = notifychangeproperty(dbus.UInt16,

1309

approval_delay = notifychangeproperty(dbus.UInt64,

1072

1310

"ApprovalDelay",

1073

1311

type_func =

1074

_timedelta_to_milliseconds)

1312

lambda td: td.total_seconds()

1313

* 1000)

1075

1314

approval_duration = notifychangeproperty(

1076

dbus.UInt16, "ApprovalDuration",

1077

type_func = _timedelta_to_milliseconds)

1315

dbus.UInt64, "ApprovalDuration",

1316

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

1078

1317

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

1079

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

1080

type_func =

1081

_timedelta_to_milliseconds)

1318

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

1319

type_func = lambda td:

1320

td.total_seconds() * 1000)

1082

1321

extended_timeout = notifychangeproperty(

1083

dbus.UInt16, "ExtendedTimeout",

1084

type_func = _timedelta_to_milliseconds)

1085

interval = notifychangeproperty(dbus.UInt16,

1322

dbus.UInt64, "ExtendedTimeout",

1323

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

1324

interval = notifychangeproperty(dbus.UInt64,

1086

1325

"Interval",

1087

1326

type_func =

1088

_timedelta_to_milliseconds)

1327

lambda td: td.total_seconds()

1328

* 1000)

1089

1329

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

1330

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

1331

invalidate_only=True)

1090

1332

1091

1333

del notifychangeproperty

1092

1334

1119

1361

*args, **kwargs)

1120

1362

1121

1363

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

1122

old_checker = self.checker

1123

if self.checker is not None:

1124

old_checker_pid = self.checker.pid

1125

else:

1126

old_checker_pid = None

1364

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

1127

1365

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

1128

1366

# Only if new checker process was started

1129

1367

if (self.checker is not None

1133

1371

return r

1134

1372

1135

1373

def _reset_approved(self):

1136

self._approved = None

1374

self.approved = None

1137

1375

return False

1138

1376

1139

1377

def approve(self, value=True):

1378

self.approved = value

1379

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

1380

* 1000), self._reset_approved)

1140

1381

self.send_changedstate()

1141

self._approved = value

1142

gobject.timeout_add(_timedelta_to_milliseconds

1143

(self.approval_duration),

1144

self._reset_approved)

1145

1146

1382

1147

1383

## D-Bus methods, signals & properties

1148

_interface = "se.recompile.Mandos.Client"

1384

1385

## Interfaces

1149

1386

1150

1387

## Signals

1151

1388

1162

1399

pass

1163

1400

1164

1401

# PropertyChanged - signal

1402

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

1165

1403

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

1166

1404

def PropertyChanged(self, property, value):

1167

1405

"D-Bus signal"

1188

1426

"D-Bus signal"

1189

1427

return self.need_approval()

1190

1428

1191

# NeRwequest - signal

1192

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

1193

def NewRequest(self, ip):

1194

"""D-Bus signal

1195

Is sent after a client request a password.

1196

"""

1197

pass

1198

1199

1429

## Methods

1200

1430

1201

1431

# Approve - method

1251

1481

access="readwrite")

1252

1482

def ApprovalDelay_dbus_property(self, value=None):

1253

1483

if value is None: # get

1254

return dbus.UInt64(self.approval_delay_milliseconds())

1484

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

1485

* 1000)

1255

1486

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

1256

1487

1257

1488

# ApprovalDuration - property

1259

1490

access="readwrite")

1260

1491

def ApprovalDuration_dbus_property(self, value=None):

1261

1492

if value is None: # get

1262

return dbus.UInt64(_timedelta_to_milliseconds(

1263

self.approval_duration))

1493

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

1494

* 1000)

1264

1495

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

1265

1496

1266

1497

# Name - property

1279

1510

def Host_dbus_property(self, value=None):

1280

1511

if value is None: # get

1281

1512

return dbus.String(self.host)

1282

self.host = value

1513

self.host = str(value)

1283

1514

1284

1515

# Created - property

1285

1516

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

1311

1542

return

1312

1543

return datetime_to_dbus(self.last_checked_ok)

1313

1544

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

1314

1551

# Expires - property

1315

1552

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

1316

1553

def Expires_dbus_property(self):

1326

1563

access="readwrite")

1327

1564

def Timeout_dbus_property(self, value=None):

1328

1565

if value is None: # get

1329

return dbus.UInt64(self.timeout_milliseconds())

1566

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

1567

old_timeout = self.timeout

1330

1568

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

1331

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

1332

return

1333

# Reschedule timeout

1334

gobject.source_remove(self.disable_initiator_tag)

1335

self.disable_initiator_tag = None

1336

self.expires = None

1337

time_to_die = _timedelta_to_milliseconds((self

1338

.last_checked_ok

1339

+ self.timeout)

1340

- datetime.datetime

1341

.utcnow())

1342

if time_to_die <= 0:

1343

# The timeout has passed

1344

self.disable()

1345

else:

1346

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

1347

+ datetime.timedelta(milliseconds =

1348

time_to_die))

1349

self.disable_initiator_tag = (gobject.timeout_add

1350

(time_to_die, self.disable))

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))

1351

1585

1352

1586

# ExtendedTimeout - property

1353

1587

@dbus_service_property(_interface, signature="t",

1354

1588

access="readwrite")

1355

1589

def ExtendedTimeout_dbus_property(self, value=None):

1356

1590

if value is None: # get

1357

return dbus.UInt64(self.extended_timeout_milliseconds())

1591

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

1592

* 1000)

1358

1593

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

1359

1594

1360

1595

# Interval - property

1362

1597

access="readwrite")

1363

1598

def Interval_dbus_property(self, value=None):

1364

1599

if value is None: # get

1365

return dbus.UInt64(self.interval_milliseconds())

1600

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

1366

1601

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

1367

1602

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

1368

1603

return

1379

1614

def Checker_dbus_property(self, value=None):

1380

1615

if value is None: # get

1381

1616

return dbus.String(self.checker_command)

1382

self.checker_command = value

1617

self.checker_command = str(value)

1383

1618

1384

1619

# CheckerRunning - property

1385

1620

@dbus_service_property(_interface, signature="b",

1401

1636

@dbus_service_property(_interface, signature="ay",

1402

1637

access="write", byte_arrays=True)

1403

1638

def Secret_dbus_property(self, value):

1404

self.secret = str(value)

1639

self.secret = bytes(value)

1405

1640

1406

1641

del _interface

1407

1642

1414

1649

raise KeyError()

1415

1650

1416

1651

def __getattribute__(self, name):

1417

if(name == '_pipe'):

1652

if name == '_pipe':

1418

1653

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

1419

1654

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

1420

1655

data = self._pipe.recv()

1427

1662

return func

1428

1663

1429

1664

def __setattr__(self, name, value):

1430

if(name == '_pipe'):

1665

if name == '_pipe':

1431

1666

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

1432

1667

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

1433

1668

1434

1669

1435

class ClientDBusTransitional(ClientDBus):

1436

__metaclass__ = AlternateDBusNamesMetaclass

1437

1438

1439

1670

class ClientHandler(socketserver.BaseRequestHandler, object):

1440

1671

"""A class to handle client connections.

1441

1672

1445

1676

def handle(self):

1446

1677

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

1447

1678

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

1448

unicode(self.client_address))

1679

str(self.client_address))

1449

1680

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

1450

1681

self.server.child_pipe.fileno())

1451

1682

1477

1708

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

1478

1709

try:

1479

1710

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

1480

raise RuntimeError

1711

raise RuntimeError(line)

1481

1712

except (ValueError, IndexError, RuntimeError) as error:

1482

1713

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

1483

1714

return

1502

1733

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

1503

1734

return

1504

1735

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

1505

if self.server.use_dbus:

1506

# Emit D-Bus signal

1507

client.NewRequest(str(self.client_address))

1508

1736

1509

1737

try:

1510

1738

client = ProxyClient(child_pipe, fpr,

1526

1754

client.Rejected("Disabled")

1527

1755

return

1528

1756

1529

if client._approved or not client.approval_delay:

1757

if client.approved or not client.approval_delay:

1530

1758

#We are approved or approval is disabled

1531

1759

break

1532

elif client._approved is None:

1760

elif client.approved is None:

1533

1761

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

1534

1762

client.name)

1535

1763

if self.server.use_dbus:

1536

1764

# Emit D-Bus signal

1537

1765

client.NeedApproval(

1538

client.approval_delay_milliseconds(),

1539

client.approved_by_default)

1766

client.approval_delay.total_seconds()

1767

* 1000, client.approved_by_default)

1540

1768

else:

1541

1769

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

1542

1770

client.name)

1548

1776

#wait until timeout or approved

1549

1777

time = datetime.datetime.now()

1550

1778

client.changedstate.acquire()

1551

(client.changedstate.wait

1552

(float(client._timedelta_to_milliseconds(delay)

1553

/ 1000)))

1779

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

1554

1780

client.changedstate.release()

1555

1781

time2 = datetime.datetime.now()

1556

1782

if (time2 - time) >= delay:

1572

1798

try:

1573

1799

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

1574

1800

except gnutls.errors.GNUTLSError as error:

1575

logger.warning("gnutls send failed")

1801

logger.warning("gnutls send failed",

1802

exc_info=error)

1576

1803

return

1577

1804

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

1578

1805

sent, len(client.secret)

1581

1808

1582

1809

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

1583

1810

# bump the timeout using extended_timeout

1584

client.checked_ok(client.extended_timeout)

1811

client.bump_timeout(client.extended_timeout)

1585

1812

if self.server.use_dbus:

1586

1813

# Emit D-Bus signal

1587

1814

client.GotSecret()

1592

1819

try:

1593

1820

session.bye()

1594

1821

except gnutls.errors.GNUTLSError as error:

1595

logger.warning("GnuTLS bye failed")

1822

logger.warning("GnuTLS bye failed",

1823

exc_info=error)

1596

1824

1597

1825

@staticmethod

1598

1826

def peer_certificate(session):

1663

1891

def sub_process_main(self, request, address):

1664

1892

try:

1665

1893

self.finish_request(request, address)

1666

except:

1894

except Exception:

1667

1895

self.handle_error(request, address)

1668

1896

self.close_request(request)

1669

1897

1670

1898

def process_request(self, request, address):

1671

1899

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

1672

1900

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

1673

args = (request,

1674

address))

1901

args = (request, address))

1675

1902

proc.start()

1676

1903

return proc

1677

1904

1692

1919

1693

1920

def add_pipe(self, parent_pipe, proc):

1694

1921

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

1695

raise NotImplementedError

1922

raise NotImplementedError()

1696

1923

1697

1924

1698

1925

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1705

1932

use_ipv6: Boolean; to use IPv6 or not

1706

1933

"""

1707

1934

def __init__(self, server_address, RequestHandlerClass,

1708

interface=None, use_ipv6=True):

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

"""

1709

1939

self.interface = interface

1710

1940

if use_ipv6:

1711

1941

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.

1712

1968

socketserver.TCPServer.__init__(self, server_address,

1713

1969

RequestHandlerClass)

1970

1714

1971

def server_bind(self):

1715

1972

"""This overrides the normal server_bind() function

1716

1973

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

1724

1981

try:

1725

1982

self.socket.setsockopt(socket.SOL_SOCKET,

1726

1983

SO_BINDTODEVICE,

1727

str(self.interface

1728

+ '\0'))

1984

(self.interface + "\0")

1985

.encode("utf-8"))

1729

1986

except socket.error as error:

1730

if error[0] == errno.EPERM:

1731

logger.error("No permission to"

1732

" bind to interface %s",

1733

self.interface)

1734

elif error[0] == errno.ENOPROTOOPT:

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:

1735

1991

logger.error("SO_BINDTODEVICE not available;"

1736

1992

" cannot bind to interface %s",

1737

1993

self.interface)

1994

elif error.errno == errno.ENODEV:

1995

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

1996

" cannot bind", self.interface)

1738

1997

else:

1739

1998

raise

1740

1999

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

1743

2002

if self.address_family == socket.AF_INET6:

1744

2003

any_address = "::" # in6addr_any

1745

2004

else:

1746

any_address = socket.INADDR_ANY

2005

any_address = "0.0.0.0" # INADDR_ANY

1747

2006

self.server_address = (any_address,

1748

2007

self.server_address[1])

1749

2008

elif not self.server_address[1]:

1770

2029

"""

1771

2030

def __init__(self, server_address, RequestHandlerClass,

1772

2031

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

1773

gnutls_priority=None, use_dbus=True):

2032

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

1774

2033

self.enabled = False

1775

2034

self.clients = clients

1776

2035

if self.clients is None:

1780

2039

IPv6_TCPServer.__init__(self, server_address,

1781

2040

RequestHandlerClass,

1782

2041

interface = interface,

1783

use_ipv6 = use_ipv6)

2042

use_ipv6 = use_ipv6,

2043

socketfd = socketfd)

1784

2044

def server_activate(self):

1785

2045

if self.enabled:

1786

2046

return socketserver.TCPServer.server_activate(self)

1799

2059

1800

2060

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

1801

2061

proc = None, client_object=None):

1802

condition_names = {

1803

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

1804

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

1805

# blocking).

1806

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

1807

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

1808

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

1809

# broken, usually for pipes and

1810

# sockets).

1811

}

1812

conditions_string = ' | '.join(name

1813

for cond, name in

1814

condition_names.iteritems()

1815

if cond & condition)

1816

2062

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

1817

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

2063

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

1818

2064

# Wait for other process to exit

1819

2065

proc.join()

1820

2066

return False

1878

2124

return True

1879

2125

1880

2126

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

1881

2226

def string_to_delta(interval):

1882

2227

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

1883

2228

1894

2239

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

1895

2240

datetime.timedelta(0, 330)

1896

2241

"""

2242

2243

try:

2244

return rfc3339_duration_to_delta(interval)

2245

except ValueError:

2246

pass

2247

1897

2248

timevalue = datetime.timedelta(0)

1898

2249

for s in interval.split():

1899

2250

try:

1900

suffix = unicode(s[-1])

2251

suffix = s[-1]

1901

2252

value = int(s[:-1])

1902

2253

if suffix == "d":

1903

2254

delta = datetime.timedelta(value)

1910

2261

elif suffix == "w":

1911

2262

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

1912

2263

else:

1913

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

1914

except (ValueError, IndexError) as e:

2264

raise ValueError("Unknown suffix {!r}"

2265

.format(suffix))

2266

except IndexError as e:

1915

2267

raise ValueError(*(e.args))

1916

2268

timevalue += delta

1917

2269

return timevalue

1930

2282

sys.exit()

1931

2283

if not noclose:

1932

2284

# Close all standard open file descriptors

1933

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

2285

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

1934

2286

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

1935

raise OSError(errno.ENODEV,

1936

"%s not a character device"

1937

% os.path.devnull)

2287

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

2288

.format(os.devnull))

1938

2289

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

1939

2290

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

1940

2291

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

1949

2300

1950

2301

parser = argparse.ArgumentParser()

1951

2302

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

1952

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

2303

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

1953

2304

help="show version number and exit")

1954

2305

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

1955

2306

help="Bind to interface IF")

1961

2312

help="Run self-test")

1962

2313

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

1963

2314

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

1964

" to terminal")

2315

" to terminal", default=None)

1965

2316

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

1966

2317

help="Debug level for stdout output")

1967

2318

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

1974

2325

" files")

1975

2326

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

1976

2327

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

1977

" system bus interface")

2328

" system bus interface", default=None)

1978

2329

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

1979

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

2330

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

2331

default=None)

1980

2332

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

1981

2333

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

1982

" state")

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")

1983

2338

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

1984

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)

1985

2345

1986

2346

options = parser.parse_args()

1987

2347

1988

2348

if options.check:

1989

2349

import doctest

1990

doctest.testmod()

1991

sys.exit()

2350

fail_count, test_count = doctest.testmod()

2351

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

1992

2352

1993

2353

# Default values for config file for server-global settings

1994

2354

server_defaults = { "interface": "",

1996

2356

"port": "",

1997

2357

"debug": "False",

1998

2358

"priority":

1999

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

2359

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

2000

2360

"servicename": "Mandos",

2001

2361

"use_dbus": "True",

2002

2362

"use_ipv6": "True",

2003

2363

"debuglevel": "",

2004

2364

"restore": "True",

2005

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

2365

"socket": "",

2366

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

2367

"foreground": "False",

2368

"zeroconf": "True",

2006

2369

}

2007

2370

2008

2371

# Parse config file for server-global settings

2013

2376

# Convert the SafeConfigParser object to a dict

2014

2377

server_settings = server_config.defaults()

2015

2378

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

2016

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

2379

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

2017

2380

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

2018

2381

option)

2019

2382

if server_settings["port"]:

2020

2383

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

2021

2384

"port")

2385

if server_settings["socket"]:

2386

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

2387

"socket")

2388

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

2389

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

2390

# happen with a supplied network socket.

2391

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

2392

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

2393

["socket"])

2022

2394

del server_config

2023

2395

2024

2396

# Override the settings from the config file with command line

2026

2398

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

2027

2399

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

2028

2400

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

2029

"statedir"):

2401

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

2030

2402

value = getattr(options, option)

2031

2403

if value is not None:

2032

2404

server_settings[option] = value

2033

2405

del options

2034

2406

# Force all strings to be unicode

2035

2407

for option in server_settings.keys():

2036

if type(server_settings[option]) is str:

2037

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

2408

if isinstance(server_settings[option], bytes):

2409

server_settings[option] = (server_settings[option]

2410

.decode("utf-8"))

2411

# Force all boolean options to be boolean

2412

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

2413

"foreground", "zeroconf"):

2414

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

2415

# Debug implies foreground

2416

if server_settings["debug"]:

2417

server_settings["foreground"] = True

2038

2418

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

2039

2419

2040

2420

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

2041

2421

2422

if (not server_settings["zeroconf"] and

2423

not (server_settings["port"]

2424

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

2425

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

2426

" Zeroconf")

2427

2042

2428

# For convenience

2043

2429

debug = server_settings["debug"]

2044

2430

debuglevel = server_settings["debuglevel"]

2046

2432

use_ipv6 = server_settings["use_ipv6"]

2047

2433

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

2048

2434

stored_state_file)

2435

foreground = server_settings["foreground"]

2436

zeroconf = server_settings["zeroconf"]

2049

2437

2050

2438

if debug:

2051

initlogger(logging.DEBUG)

2439

initlogger(debug, logging.DEBUG)

2052

2440

else:

2053

2441

if not debuglevel:

2054

initlogger()

2442

initlogger(debug)

2055

2443

else:

2056

2444

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

2057

initlogger(level)

2445

initlogger(debug, level)

2058

2446

2059

2447

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

2060

2448

syslogger.setFormatter(logging.Formatter

2061

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

2062

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

2063

% server_settings["servicename"]))

2449

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

2450

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

2451

.format(server_settings

2452

["servicename"])))

2064

2453

2065

2454

# Parse config file with clients

2066

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

2067

"extended_timeout": "15m",

2068

"interval": "2m",

2069

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

2070

"host": "",

2071

"approval_delay": "0s",

2072

"approval_duration": "1s",

2073

}

2074

client_config = configparser.SafeConfigParser(client_defaults)

2455

client_config = configparser.SafeConfigParser(Client

2456

.client_defaults)

2075

2457

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

2076

2458

"clients.conf"))

2077

2459

2078

2460

global mandos_dbus_service

2079

2461

mandos_dbus_service = None

2080

2462

2463

socketfd = None

2464

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

2465

socketfd = server_settings["socket"]

2081

2466

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

2082

2467

server_settings["port"]),

2083

2468

ClientHandler,

2086

2471

use_ipv6=use_ipv6,

2087

2472

gnutls_priority=

2088

2473

server_settings["priority"],

2089

use_dbus=use_dbus)

2090

if not debug:

2091

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

2474

use_dbus=use_dbus,

2475

socketfd=socketfd)

2476

if not foreground:

2477

pidfilename = "/run/mandos.pid"

2478

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

2479

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

2480

pidfile = None

2092

2481

try:

2093

2482

pidfile = open(pidfilename, "w")

2094

except IOError:

2095

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

2483

except IOError as e:

2484

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

2485

exc_info=e)

2096

2486

2097

try:

2098

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

2099

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

2100

except KeyError:

2487

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

2101

2488

try:

2102

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

2103

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

2489

uid = pwd.getpwnam(name).pw_uid

2490

gid = pwd.getpwnam(name).pw_gid

2491

break

2104

2492

except KeyError:

2105

try:

2106

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

2107

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

2108

except KeyError:

2109

uid = 65534

2110

gid = 65534

2493

continue

2494

else:

2495

uid = 65534

2496

gid = 65534

2111

2497

try:

2112

2498

os.setgid(gid)

2113

2499

os.setuid(uid)

2114

2500

except OSError as error:

2115

if error[0] != errno.EPERM:

2116

raise error

2501

if error.errno != errno.EPERM:

2502

raise

2117

2503

2118

2504

if debug:

2119

2505

# Enable all possible GnuTLS debugging

2130

2516

.gnutls_global_set_log_function(debug_gnutls))

2131

2517

2132

2518

# Redirect stdin so all checkers get /dev/null

2133

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

2519

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

2134

2520

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

2135

2521

if null > 2:

2136

2522

os.close(null)

2137

else:

2138

# No console logging

2139

logger.removeHandler(console)

2140

2523

2141

2524

# Need to fork before connecting to D-Bus

2142

if not debug:

2525

if not foreground:

2143

2526

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

2144

2527

daemon()

2145

2528

2529

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

2530

# need to inform gobject that threads will be used.

2531

gobject.threads_init()

2532

2146

2533

global main_loop

2147

2534

# From the Avahi example code

2148

DBusGMainLoop(set_as_default=True )

2535

DBusGMainLoop(set_as_default=True)

2149

2536

main_loop = gobject.MainLoop()

2150

2537

bus = dbus.SystemBus()

2151

2538

# End of Avahi example code

2157

2544

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

2158

2545

do_not_queue=True))

2159

2546

except dbus.exceptions.NameExistsException as e:

2160

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

2547

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

2161

2548

use_dbus = False

2162

2549

server_settings["use_dbus"] = False

2163

2550

tcp_server.use_dbus = False

2164

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2165

service = AvahiServiceToSyslog(name =

2166

server_settings["servicename"],

2167

servicetype = "_mandos._tcp",

2168

protocol = protocol, bus = bus)

2169

if server_settings["interface"]:

2170

service.interface = (if_nametoindex

2171

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

2551

if zeroconf:

2552

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2553

service = AvahiServiceToSyslog(name =

2554

server_settings["servicename"],

2555

servicetype = "_mandos._tcp",

2556

protocol = protocol, bus = bus)

2557

if server_settings["interface"]:

2558

service.interface = (if_nametoindex

2559

(server_settings["interface"]

2560

.encode("utf-8")))

2172

2561

2173

2562

global multiprocessing_manager

2174

2563

multiprocessing_manager = multiprocessing.Manager()

2175

2564

2176

2565

client_class = Client

2177

2566

if use_dbus:

2178

client_class = functools.partial(ClientDBusTransitional,

2179

bus = bus)

2180

2181

special_settings = {

2182

# Some settings need to be accessd by special methods;

2183

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

2184

"approved_by_default":

2185

lambda section:

2186

client_config.getboolean(section, "approved_by_default"),

2187

"enabled":

2188

lambda section:

2189

client_config.getboolean(section, "enabled"),

2190

}

2191

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

2192

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

2193

# with exceptions for any special settings as defined above

2194

client_settings = dict((clientname,

2195

dict((setting,

2196

(value

2197

if setting not in special_settings

2198

else special_settings[setting]

2199

(clientname)))

2200

for setting, value in

2201

client_config.items(clientname)))

2202

for clientname in client_config.sections())

2203

2567

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

2568

2569

client_settings = Client.config_parser(client_config)

2204

2570

old_client_settings = {}

2205

clients_data = []

2571

clients_data = {}

2572

2573

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

2574

global wnull

2575

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

2576

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

2577

# mode

2578

if debug or not foreground:

2579

wnull.close()

2206

2580

2207

2581

# Get client data and settings from last running state.

2208

2582

if server_settings["restore"]:

2212

2586

(stored_state))

2213

2587

os.remove(stored_state_path)

2214

2588

except IOError as e:

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2589

if e.errno == errno.ENOENT:

2590

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

2591

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

2592

else:

2593

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

2594

exc_info=e)

2218

2595

raise

2596

except EOFError as e:

2597

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

2598

"EOFError:", exc_info=e)

2219

2599

2220

with Crypto() as crypt:

2221

for client in clients_data:

2222

client_name = client["name"]

2600

with PGPEngine() as pgp:

2601

for client_name, client in clients_data.items():

2602

# Skip removed clients

2603

if client_name not in client_settings:

2604

continue

2223

2605

2224

2606

# Decide which value to use after restoring saved state.

2225

2607

# We have three different values: Old config file,

2234

2616

if (name != "secret" and

2235

2617

value != old_client_settings[client_name]

2236

2618

[name]):

2237

setattr(client, name, value)

2619

client[name] = value

2238

2620

except KeyError:

2239

2621

pass

2240

2622

2241

2623

# Clients who has passed its expire date can still be

2242

# enabled if its last checker was sucessful. Clients

2243

# whose checker failed before we stored its state is

2244

# assumed to have failed all checkers during downtime.

2245

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

2246

if ((datetime.datetime.utcnow()

2247

- client["last_checked_ok"])

2248

> client["interval"]):

2249

if client["last_checker_status"] != 0:

2624

# enabled if its last checker was successful. Clients

2625

# whose checker succeeded before we stored its state is

2626

# assumed to have successfully run all checkers during

2627

# downtime.

2628

if client["enabled"]:

2629

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

2630

if not client["last_checked_ok"]:

2631

logger.warning(

2632

"disabling client {} - Client never "

2633

"performed a successful checker"

2634

.format(client_name))

2635

client["enabled"] = False

2636

elif client["last_checker_status"] != 0:

2637

logger.warning(

2638

"disabling client {} - Client last"

2639

" checker failed with error code {}"

2640

.format(client_name,

2641

client["last_checker_status"]))

2250

2642

client["enabled"] = False

2251

2643

else:

2252

2644

client["expires"] = (datetime.datetime

2253

2645

.utcnow()

2254

2646

+ client["timeout"])

2255

2256

client["changedstate"] = (multiprocessing_manager

2257

.Condition

2258

(multiprocessing_manager

2259

.Lock()))

2260

if use_dbus:

2261

new_client = (ClientDBusTransitional.__new__

2262

(ClientDBusTransitional))

2263

tcp_server.clients[client_name] = new_client

2264

new_client.bus = bus

2265

for name, value in client.iteritems():

2266

setattr(new_client, name, value)

2267

client_object_name = unicode(client_name).translate(

2268

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

2269

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

2270

new_client.dbus_object_path = (dbus.ObjectPath

2271

("/clients/"

2272

+ client_object_name))

2273

DBusObjectWithProperties.__init__(new_client,

2274

new_client.bus,

2275

new_client

2276

.dbus_object_path)

2277

else:

2278

tcp_server.clients[client_name] = (Client.__new__

2279

(Client))

2280

for name, value in client.iteritems():

2281

setattr(tcp_server.clients[client_name],

2282

name, value)

2283

2647

logger.debug("Last checker succeeded,"

2648

" keeping {} enabled"

2649

.format(client_name))

2284

2650

try:

2285

tcp_server.clients[client_name].secret = (

2286

crypt.decrypt(tcp_server.clients[client_name]

2287

.encrypted_secret,

2288

client_settings[client_name]

2289

["secret"]))

2290

except CryptoError:

2651

client["secret"] = (

2652

pgp.decrypt(client["encrypted_secret"],

2653

client_settings[client_name]

2654

["secret"]))

2655

except PGPError:

2291

2656

# If decryption fails, we use secret from new settings

2292

tcp_server.clients[client_name].secret = (

2657

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

2658

.format(client_name))

2659

client["secret"] = (

2293

2660

client_settings[client_name]["secret"])

2294

2661

2295

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

2296

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

2297

del tcp_server.clients[clientname]

2298

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

2299

tcp_server.clients[clientname] = (client_class(name

2300

= clientname,

2301

config =

2302

client_settings

2303

[clientname]))

2662

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

2663

for client_name in (set(old_client_settings)

2664

- set(client_settings)):

2665

del clients_data[client_name]

2666

for client_name in (set(client_settings)

2667

- set(old_client_settings)):

2668

clients_data[client_name] = client_settings[client_name]

2669

2670

# Create all client objects

2671

for client_name, client in clients_data.items():

2672

tcp_server.clients[client_name] = client_class(

2673

name = client_name, settings = client,

2674

server_settings = server_settings)

2304

2675

2305

2676

if not tcp_server.clients:

2306

2677

logger.warning("No clients defined")

2307

2308

if not debug:

2309

try:

2310

with pidfile:

2311

pid = os.getpid()

2312

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

2313

del pidfile

2314

except IOError:

2315

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

2316

pidfilename, pid)

2317

except NameError:

2318

# "pidfile" was never created

2319

pass

2678

2679

if not foreground:

2680

if pidfile is not None:

2681

try:

2682

with pidfile:

2683

pid = os.getpid()

2684

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

2685

except IOError:

2686

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

2687

pidfilename, pid)

2688

del pidfile

2320

2689

del pidfilename

2321

2322

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

2323

2690

2324

2691

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

2325

2692

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

2326

2693

2327

2694

if use_dbus:

2328

class MandosDBusService(dbus.service.Object):

2695

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

2696

"se.bsnet.fukt.Mandos"})

2697

class MandosDBusService(DBusObjectWithProperties):

2329

2698

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

2330

2699

def __init__(self):

2331

2700

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

2332

2701

_interface = "se.recompile.Mandos"

2333

2702

2703

@dbus_interface_annotations(_interface)

2704

def _foo(self):

2705

return { "org.freedesktop.DBus.Property"

2706

".EmitsChangedSignal":

2707

"false"}

2708

2334

2709

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

2335

2710

def ClientAdded(self, objpath):

2336

2711

"D-Bus signal"

2358

2733

def GetAllClientsWithProperties(self):

2359

2734

"D-Bus method"

2360

2735

return dbus.Dictionary(

2361

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

2362

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

2736

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

2737

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

2363

2738

signature="oa{sv}")

2364

2739

2365

2740

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

2378

2753

2379

2754

del _interface

2380

2755

2381

class MandosDBusServiceTransitional(MandosDBusService):

2382

__metaclass__ = AlternateDBusNamesMetaclass

2383

mandos_dbus_service = MandosDBusServiceTransitional()

2756

mandos_dbus_service = MandosDBusService()

2384

2757

2385

2758

def cleanup():

2386

2759

"Cleanup function; run on exit"

2387

service.cleanup()

2760

if zeroconf:

2761

service.cleanup()

2388

2762

2389

2763

multiprocessing.active_children()

2764

wnull.close()

2390

2765

if not (tcp_server.clients or client_settings):

2391

2766

return

2392

2767

2393

2768

# Store client before exiting. Secrets are encrypted with key

2394

2769

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

2395

2770

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

2396

clients = []

2397

with Crypto() as crypt:

2771

clients = {}

2772

with PGPEngine() as pgp:

2398

2773

for client in tcp_server.clients.itervalues():

2399

2774

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

2400

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

2401

key)

2775

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

2776

key)

2402

2777

client_dict = {}

2403

2778

2404

# A list of attributes that will not be stored when

2405

# shutting down.

2406

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

2779

# A list of attributes that can not be pickled

2780

# + secret.

2781

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

2782

"checker", "server_settings" }

2407

2783

for name, typ in (inspect.getmembers

2408

2784

(dbus.service.Object)):

2409

2785

exclude.add(name)

2414

2790

if attr not in exclude:

2415

2791

client_dict[attr] = getattr(client, attr)

2416

2792

2417

clients.append(client_dict)

2793

clients[client.name] = client_dict

2418

2794

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

2419

2795

2420

2796

try:

2421

with os.fdopen(os.open(stored_state_path,

2422

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

2423

0600), "wb") as stored_state:

2797

with (tempfile.NamedTemporaryFile

2798

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

2799

dir=os.path.dirname(stored_state_path),

2800

delete=False)) as stored_state:

2424

2801

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

2802

tempname=stored_state.name

2803

os.rename(tempname, stored_state_path)

2425

2804

except (IOError, OSError) as e:

2426

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

2427

.format(e))

2428

if e.errno not in (errno.ENOENT, errno.EACCES):

2805

if not debug:

2806

try:

2807

os.remove(tempname)

2808

except NameError:

2809

pass

2810

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

2811

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

2812

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

2813

else:

2814

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

2815

exc_info=e)

2429

2816

raise

2430

2817

2431

2818

# Delete all clients, and settings from config

2456

2843

tcp_server.server_activate()

2457

2844

2458

2845

# Find out what port we got

2459

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

2846

if zeroconf:

2847

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

2460

2848

if use_ipv6:

2461

2849

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

2462

" flowinfo %d, scope_id %d"

2463

% tcp_server.socket.getsockname())

2850

" flowinfo %d, scope_id %d",

2851

*tcp_server.socket.getsockname())

2464

2852

else: # IPv4

2465

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

2466

% tcp_server.socket.getsockname())

2853

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

2854

*tcp_server.socket.getsockname())

2467

2855

2468

2856

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

2469

2857

2470

2858

try:

2471

# From the Avahi example code

2472

try:

2473

service.activate()

2474

except dbus.exceptions.DBusException as error:

2475

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

2476

cleanup()

2477

sys.exit(1)

2478

# End of Avahi example code

2859

if zeroconf:

2860

# From the Avahi example code

2861

try:

2862

service.activate()

2863

except dbus.exceptions.DBusException as error:

2864

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

2865

cleanup()

2866

sys.exit(1)

2867

# End of Avahi example code

2479

2868

2480

2869

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

2481

2870

lambda *args, **kwargs:

2485

2874

logger.debug("Starting main loop")

2486

2875

main_loop.run()

2487

2876

except AvahiError as error:

2488

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

2877

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

2489

2878

cleanup()

2490

2879

sys.exit(1)

2491

2880

except KeyboardInterrupt:

2496

2885

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

2497

2886

cleanup()

2498

2887

2499

2500

2888

if __name__ == '__main__':

2501

2889

main()