/mandos/trunk : revision 713

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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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version = "1.5.2"

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version = "1.6.6"

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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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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'--no-use-agent'])

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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 PGPError(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 PGPError(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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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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"""Derived from the Avahi example code"""

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if self.rename_count >= self.max_renames:

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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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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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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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raise AvahiGroupError("State changed: {0!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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"""Add the new name to the syslog messages"""

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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('Mandos ({0}) [%(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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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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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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client_defaults = { "timeout": "5m",

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"extended_timeout": "15m",

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"interval": "2m",

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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": "0s",

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"approval_duration": "1s",

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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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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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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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"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 %s"

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% section)

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raise TypeError("No secret or secfile for section {0}"

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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["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"] = 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):

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

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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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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:

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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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607

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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611

self.checker_initiator_tag = None

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self.stop_checker()

591

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self.enabled = False

614

if not quiet:

615

self.send_changedstate()

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

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return False

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def init_checker(self):

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623

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

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# and every interval from then on.

625

if self.checker_initiator_tag is not None:

626

gobject.source_remove(self.checker_initiator_tag)

601

627

self.checker_initiator_tag = (gobject.timeout_add

602

628

(self.interval_milliseconds(),

603

629

self.start_checker))

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

631

if self.disable_initiator_tag is not None:

632

gobject.source_remove(self.disable_initiator_tag)

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633

self.disable_initiator_tag = (gobject.timeout_add

606

634

(self.timeout_milliseconds(),

607

635

self.disable))

626

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

627

655

vars(self))

628

656

629

def checked_ok(self, timeout=None):

630

"""Bump up the timeout for this client.

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632

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

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alive and well.

634

"""

657

def checked_ok(self):

658

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

659

self.last_checked_ok = datetime.datetime.utcnow()

660

self.last_checker_status = 0

661

self.bump_timeout()

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663

def bump_timeout(self, timeout=None):

664

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

635

665

if timeout is None:

636

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timeout = self.timeout

637

self.last_checked_ok = datetime.datetime.utcnow()

638

667

if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

669

self.disable_initiator_tag = None

640

670

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

641

671

self.disable_initiator_tag = (gobject.timeout_add

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672

(timedelta_to_milliseconds

652

682

If a checker already exists, leave it running and do

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683

nothing."""

654

684

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

655

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

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

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# client would inevitably timeout, since no checker would get

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

685

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

686

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

687

# would inevitably timeout, since no checker would get a

688

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

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689

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

660

690

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

661

691

# should be.

663

693

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

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694

try:

665

695

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

666

except (AttributeError, OSError) as error:

667

if (isinstance(error, OSError)

668

and error.errno != errno.ECHILD):

669

raise error

696

except AttributeError:

697

pass

698

except OSError as error:

699

if error.errno != errno.ECHILD:

700

raise

670

701

else:

671

702

if pid:

672

703

logger.warning("Checker was a zombie")

675

706

self.current_checker_command)

676

707

# Start a new checker if needed

677

708

if self.checker is None:

709

# Escape attributes for the shell

710

escaped_attrs = dict(

711

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

712

for attr in

713

self.runtime_expansions)

678

714

try:

679

# In case checker_command has exactly one % operator

680

command = self.checker_command % self.host

681

except TypeError:

682

# Escape attributes for the shell

683

escaped_attrs = dict(

684

(attr,

685

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

686

errors=

687

'replace')))

688

for attr in

689

self.runtime_expansions)

690

691

try:

692

command = self.checker_command % escaped_attrs

693

except TypeError as error:

694

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

695

' %s', self.checker_command, error)

696

return True # Try again later

715

command = self.checker_command % escaped_attrs

716

except TypeError as error:

717

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

718

self.checker_command, exc_info=error)

719

return True # Try again later

697

720

self.current_checker_command = command

698

721

try:

699

722

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

702

725

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

703

726

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

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# always replaced by /dev/null.)

728

# The exception is when not debugging but nevertheless

729

# running in the foreground; use the previously

730

# created wnull.

731

popen_args = {}

732

if (not self.server_settings["debug"]

733

and self.server_settings["foreground"]):

734

popen_args.update({"stdout": wnull,

735

"stderr": wnull })

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736

self.checker = subprocess.Popen(command,

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close_fds=True,

707

shell=True, cwd="/")

708

self.checker_callback_tag = (gobject.child_watch_add

709

(self.checker.pid,

710

self.checker_callback,

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data=command))

712

# The checker may have completed before the gobject

713

# watch was added. Check for this.

738

shell=True, cwd="/",

739

**popen_args)

740

except OSError as error:

741

logger.error("Failed to start subprocess",

742

exc_info=error)

743

return True

744

self.checker_callback_tag = (gobject.child_watch_add

745

(self.checker.pid,

746

self.checker_callback,

747

data=command))

748

# The checker may have completed before the gobject

749

# watch was added. Check for this.

750

try:

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751

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

715

if pid:

716

gobject.source_remove(self.checker_callback_tag)

717

self.checker_callback(pid, status, command)

718

752

except OSError as error:

719

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

720

error)

753

if error.errno == errno.ECHILD:

754

# This should never happen

755

logger.error("Child process vanished",

756

exc_info=error)

757

return True

758

raise

759

if pid:

760

gobject.source_remove(self.checker_callback_tag)

761

self.checker_callback(pid, status, command)

721

762

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

722

763

return True

723

764

730

771

return

731

772

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

732

773

try:

733

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

774

self.checker.terminate()

734

775

#time.sleep(0.5)

735

776

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

736

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

777

# self.checker.kill()

737

778

except OSError as error:

738

779

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

739

780

raise

756

797

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

757

798

if byte_arrays and signature != "ay":

758

799

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

759

" signature %r" % signature)

800

" signature {0!r}".format(signature))

760

801

def decorator(func):

761

802

func._dbus_is_property = True

762

803

func._dbus_interface = dbus_interface

770

811

return decorator

771

812

772

813

814

def dbus_interface_annotations(dbus_interface):

815

"""Decorator for marking functions returning interface annotations

816

817

Usage:

818

819

@dbus_interface_annotations("org.example.Interface")

820

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

821

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

822

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

823

"false"}

824

"""

825

def decorator(func):

826

func._dbus_is_interface = True

827

func._dbus_interface = dbus_interface

828

func._dbus_name = dbus_interface

829

return func

830

return decorator

831

832

833

def dbus_annotations(annotations):

834

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

835

Usage:

836

837

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

838

access="r")

839

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

840

"org.freedesktop.DBus.Property."

841

"EmitsChangedSignal": "false"})

842

def Property_dbus_property(self):

843

return dbus.Boolean(False)

844

"""

845

def decorator(func):

846

func._dbus_annotations = annotations

847

return func

848

return decorator

849

850

773

851

class DBusPropertyException(dbus.exceptions.DBusException):

774

852

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

775

853

"""

798

876

"""

799

877

800

878

@staticmethod

801

def _is_dbus_property(obj):

802

return getattr(obj, "_dbus_is_property", False)

879

def _is_dbus_thing(thing):

880

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

881

882

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

883

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

884

"""

885

return lambda obj: getattr(obj, "_dbus_is_{0}".format(thing),

886

False)

803

887

804

def _get_all_dbus_properties(self):

888

def _get_all_dbus_things(self, thing):

805

889

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

806

890

"""

807

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

891

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

892

name),

893

athing.__get__(self))

808

894

for cls in self.__class__.__mro__

809

for name, prop in

810

inspect.getmembers(cls, self._is_dbus_property))

895

for name, athing in

896

inspect.getmembers(cls,

897

self._is_dbus_thing(thing)))

811

898

812

899

def _get_dbus_property(self, interface_name, property_name):

813

900

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

815

902

"""

816

903

for cls in self.__class__.__mro__:

817

904

for name, value in (inspect.getmembers

818

(cls, self._is_dbus_property)):

905

(cls,

906

self._is_dbus_thing("property"))):

819

907

if (value._dbus_name == property_name

820

908

and value._dbus_interface == interface_name):

821

909

return value.__get__(self)

849

937

# The byte_arrays option is not supported yet on

850

938

# signatures other than "ay".

851

939

if prop._dbus_signature != "ay":

852

raise ValueError

940

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

941

"'ay' signature {0!r}"

942

.format(prop._dbus_signature))

853

943

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

854

944

for byte in value))

855

945

prop(value)

863

953

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

864

954

"""

865

955

properties = {}

866

for name, prop in self._get_all_dbus_properties():

956

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

867

957

if (interface_name

868

958

and interface_name != prop._dbus_interface):

869

959

# Interface non-empty but did not match

884

974

path_keyword='object_path',

885

975

connection_keyword='connection')

886

976

def Introspect(self, object_path, connection):

887

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

977

"""Overloading of standard D-Bus method.

978

979

Inserts property tags and interface annotation tags.

888

980

"""

889

981

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

890

982

connection)

897

989

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

898

990

return e

899

991

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

992

# Add property tags

900

993

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

901

994

for name, prop

902

in self._get_all_dbus_properties()

995

in self._get_all_dbus_things("property")

903

996

if prop._dbus_interface

904

997

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

905

998

if_tag.appendChild(tag)

999

# Add annotation tags

1000

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

1001

for tag in if_tag.getElementsByTagName(typ):

1002

annots = dict()

1003

for name, prop in (self.

1004

_get_all_dbus_things(typ)):

1005

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

1006

and prop._dbus_interface

1007

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

1008

annots.update(getattr

1009

(prop,

1010

"_dbus_annotations",

1011

{}))

1012

for name, value in annots.iteritems():

1013

ann_tag = document.createElement(

1014

"annotation")

1015

ann_tag.setAttribute("name", name)

1016

ann_tag.setAttribute("value", value)

1017

tag.appendChild(ann_tag)

1018

# Add interface annotation tags

1019

for annotation, value in dict(

1020

itertools.chain.from_iterable(

1021

annotations().iteritems()

1022

for name, annotations in

1023

self._get_all_dbus_things("interface")

1024

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

1025

)).iteritems():

1026

ann_tag = document.createElement("annotation")

1027

ann_tag.setAttribute("name", annotation)

1028

ann_tag.setAttribute("value", value)

1029

if_tag.appendChild(ann_tag)

906

1030

# Add the names to the return values for the

907

1031

# "org.freedesktop.DBus.Properties" methods

908

1032

if (if_tag.getAttribute("name")

923

1047

except (AttributeError, xml.dom.DOMException,

924

1048

xml.parsers.expat.ExpatError) as error:

925

1049

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

926

error)

1050

exc_info=error)

927

1051

return xmlstring

928

1052

929

1053

930

def datetime_to_dbus (dt, variant_level=0):

1054

def datetime_to_dbus(dt, variant_level=0):

931

1055

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

932

1056

if dt is None:

933

1057

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

935

1059

variant_level=variant_level)

936

1060

937

1061

938

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

939

.__metaclass__):

940

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

941

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

1062

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1063

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

1064

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

1065

interface names according to the "alt_interface_names" mapping.

1066

Usage:

1067

1068

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

1069

"net.example.AlternateInterface"})

1070

class SampleDBusObject(dbus.service.Object):

1071

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

1072

def SampleDBusMethod():

1073

pass

1074

1075

The above "SampleDBusMethod" on "SampleDBusObject" will be

1076

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

1077

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

1078

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

1079

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

1080

1081

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

1082

(from DBusObjectWithProperties) and interfaces (from the

1083

dbus_interface_annotations decorator).

942

1084

"""

943

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

944

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

945

# methods, signals, or properties in them

946

for base in (b for b in bases

947

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

948

# Go though all attributes of the base class

949

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

1085

def wrapper(cls):

1086

for orig_interface_name, alt_interface_name in (

1087

alt_interface_names.iteritems()):

1088

attr = {}

1089

interface_names = set()

1090

# Go though all attributes of the class

1091

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

950

1092

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

951

1093

# with the wrong interface name

952

1094

if (not hasattr(attribute, "_dbus_interface")

953

1095

or not attribute._dbus_interface

954

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

1096

.startswith(orig_interface_name)):

955

1097

continue

956

1098

# Create an alternate D-Bus interface name based on

957

1099

# the current name

958

1100

alt_interface = (attribute._dbus_interface

959

.replace("se.recompile.Mandos",

960

"se.bsnet.fukt.Mandos"))

1101

.replace(orig_interface_name,

1102

alt_interface_name))

1103

interface_names.add(alt_interface)

961

1104

# Is this a D-Bus signal?

962

1105

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

963

# Extract the original non-method function by

964

# black magic

1106

# Extract the original non-method undecorated

1107

# function by black magic

965

1108

nonmethod_func = (dict(

966

1109

zip(attribute.func_code.co_freevars,

967

1110

attribute.__closure__))["func"]

978

1121

nonmethod_func.func_name,

979

1122

nonmethod_func.func_defaults,

980

1123

nonmethod_func.func_closure)))

1124

# Copy annotations, if any

1125

try:

1126

new_function._dbus_annotations = (

1127

dict(attribute._dbus_annotations))

1128

except AttributeError:

1129

pass

981

1130

# Define a creator of a function to call both the

982

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

983

# signals gets sent when the function is called

1131

# original and alternate functions, so both the

1132

# original and alternate signals gets sent when

1133

# the function is called

984

1134

def fixscope(func1, func2):

985

1135

"""This function is a scope container to pass

986

1136

func1 and func2 to the "call_both" function

993

1143

return call_both

994

1144

# Create the "call_both" function and add it to

995

1145

# the class

996

attr[attrname] = fixscope(attribute,

997

new_function)

1146

attr[attrname] = fixscope(attribute, new_function)

998

1147

# Is this a D-Bus method?

999

1148

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

1000

1149

# Create a new, but exactly alike, function

1011

1160

attribute.func_name,

1012

1161

attribute.func_defaults,

1013

1162

attribute.func_closure)))

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1014

1169

# Is this a D-Bus property?

1015

1170

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

1016

1171

# Create a new, but exactly alike, function

1030

1185

attribute.func_name,

1031

1186

attribute.func_defaults,

1032

1187

attribute.func_closure)))

1033

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

1034

1035

1188

# Copy annotations, if any

1189

try:

1190

attr[attrname]._dbus_annotations = (

1191

dict(attribute._dbus_annotations))

1192

except AttributeError:

1193

pass

1194

# Is this a D-Bus interface?

1195

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

1196

# Create a new, but exactly alike, function

1197

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

1198

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

1199

# to the class.

1200

attr[attrname] = (dbus_interface_annotations

1201

(alt_interface)

1202

(types.FunctionType

1203

(attribute.func_code,

1204

attribute.func_globals,

1205

attribute.func_name,

1206

attribute.func_defaults,

1207

attribute.func_closure)))

1208

if deprecate:

1209

# Deprecate all alternate interfaces

1210

iname="_AlternateDBusNames_interface_annotation{0}"

1211

for interface_name in interface_names:

1212

@dbus_interface_annotations(interface_name)

1213

def func(self):

1214

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

1215

"true" }

1216

# Find an unused name

1217

for aname in (iname.format(i)

1218

for i in itertools.count()):

1219

if aname not in attr:

1220

attr[aname] = func

1221

break

1222

if interface_names:

1223

# Replace the class with a new subclass of it with

1224

# methods, signals, etc. as created above.

1225

cls = type(b"{0}Alternate".format(cls.__name__),

1226

(cls,), attr)

1227

return cls

1228

return wrapper

1229

1230

1231

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

1232

"se.bsnet.fukt.Mandos"})

1036

1233

class ClientDBus(Client, DBusObjectWithProperties):

1037

1234

"""A Client class using D-Bus

1038

1235

1058

1255

("/clients/" + client_object_name))

1059

1256

DBusObjectWithProperties.__init__(self, self.bus,

1060

1257

self.dbus_object_path)

1061

1258

1062

1259

def notifychangeproperty(transform_func,

1063

1260

dbus_name, type_func=lambda x: x,

1064

1261

variant_level=1):

1087

1284

1088

1285

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

1089

1286

1090

1091

1287

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1092

1288

approvals_pending = notifychangeproperty(dbus.Boolean,

1093

1289

"ApprovalPending",

1100

1296

checker is not None)

1101

1297

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1102

1298

"LastCheckedOK")

1299

last_checker_status = notifychangeproperty(dbus.Int16,

1300

"LastCheckerStatus")

1103

1301

last_approval_request = notifychangeproperty(

1104

1302

datetime_to_dbus, "LastApprovalRequest")

1105

1303

approved_by_default = notifychangeproperty(dbus.Boolean,

1155

1353

*args, **kwargs)

1156

1354

1157

1355

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

1158

old_checker = self.checker

1159

if self.checker is not None:

1160

old_checker_pid = self.checker.pid

1161

else:

1162

old_checker_pid = None

1356

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

1163

1357

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

1164

1358

# Only if new checker process was started

1165

1359

if (self.checker is not None

1173

1367

return False

1174

1368

1175

1369

def approve(self, value=True):

1176

self.send_changedstate()

1177

1370

self.approved = value

1178

1371

gobject.timeout_add(timedelta_to_milliseconds

1179

1372

(self.approval_duration),

1180

1373

self._reset_approved)

1181

1374

self.send_changedstate()

1182

1375

1183

1376

## D-Bus methods, signals & properties

1184

1377

_interface = "se.recompile.Mandos.Client"

1185

1378

1379

## Interfaces

1380

1381

@dbus_interface_annotations(_interface)

1382

def _foo(self):

1383

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

1384

"false"}

1385

1186

1386

## Signals

1187

1387

1188

1388

# CheckerCompleted - signal

1339

1539

return

1340

1540

return datetime_to_dbus(self.last_checked_ok)

1341

1541

1542

# LastCheckerStatus - property

1543

@dbus_service_property(_interface, signature="n",

1544

access="read")

1545

def LastCheckerStatus_dbus_property(self):

1546

return dbus.Int16(self.last_checker_status)

1547

1342

1548

# Expires - property

1343

1549

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

1344

1550

def Expires_dbus_property(self):

1355

1561

def Timeout_dbus_property(self, value=None):

1356

1562

if value is None: # get

1357

1563

return dbus.UInt64(self.timeout_milliseconds())

1564

old_timeout = self.timeout

1358

1565

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

1359

# Reschedule timeout

1566

# Reschedule disabling

1360

1567

if self.enabled:

1361

1568

now = datetime.datetime.utcnow()

1362

time_to_die = timedelta_to_milliseconds(

1363

(self.last_checked_ok + self.timeout) - now)

1364

if time_to_die <= 0:

1569

self.expires += self.timeout - old_timeout

1570

if self.expires <= now:

1365

1571

# The timeout has passed

1366

1572

self.disable()

1367

1573

else:

1368

self.expires = (now +

1369

datetime.timedelta(milliseconds =

1370

time_to_die))

1371

1574

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

1372

1575

is None):

1373

1576

return

1374

1577

gobject.source_remove(self.disable_initiator_tag)

1375

self.disable_initiator_tag = (gobject.timeout_add

1376

(time_to_die,

1377

self.disable))

1578

self.disable_initiator_tag = (

1579

gobject.timeout_add(

1580

timedelta_to_milliseconds(self.expires - now),

1581

self.disable))

1378

1582

1379

1583

# ExtendedTimeout - property

1380

1584

@dbus_service_property(_interface, signature="t",

1459

1663

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

1460

1664

1461

1665

1462

class ClientDBusTransitional(ClientDBus):

1463

__metaclass__ = AlternateDBusNamesMetaclass

1464

1465

1466

1666

class ClientHandler(socketserver.BaseRequestHandler, object):

1467

1667

"""A class to handle client connections.

1468

1668

1504

1704

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

1505

1705

try:

1506

1706

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

1507

raise RuntimeError

1707

raise RuntimeError(line)

1508

1708

except (ValueError, IndexError, RuntimeError) as error:

1509

1709

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

1510

1710

return

1572

1772

#wait until timeout or approved

1573

1773

time = datetime.datetime.now()

1574

1774

client.changedstate.acquire()

1575

(client.changedstate.wait

1576

(float(client.timedelta_to_milliseconds(delay)

1577

/ 1000)))

1775

client.changedstate.wait(

1776

float(timedelta_to_milliseconds(delay)

1777

/ 1000))

1578

1778

client.changedstate.release()

1579

1779

time2 = datetime.datetime.now()

1580

1780

if (time2 - time) >= delay:

1596

1796

try:

1597

1797

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

1598

1798

except gnutls.errors.GNUTLSError as error:

1599

logger.warning("gnutls send failed")

1799

logger.warning("gnutls send failed",

1800

exc_info=error)

1600

1801

return

1601

1802

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

1602

1803

sent, len(client.secret)

1605

1806

1606

1807

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

1607

1808

# bump the timeout using extended_timeout

1608

client.checked_ok(client.extended_timeout)

1809

client.bump_timeout(client.extended_timeout)

1609

1810

if self.server.use_dbus:

1610

1811

# Emit D-Bus signal

1611

1812

client.GotSecret()

1616

1817

try:

1617

1818

session.bye()

1618

1819

except gnutls.errors.GNUTLSError as error:

1619

logger.warning("GnuTLS bye failed")

1820

logger.warning("GnuTLS bye failed",

1821

exc_info=error)

1620

1822

1621

1823

@staticmethod

1622

1824

def peer_certificate(session):

1694

1896

def process_request(self, request, address):

1695

1897

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

1696

1898

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

1697

args = (request,

1698

address))

1899

args = (request, address))

1699

1900

proc.start()

1700

1901

return proc

1701

1902

1716

1917

1717

1918

def add_pipe(self, parent_pipe, proc):

1718

1919

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

1719

raise NotImplementedError

1920

raise NotImplementedError()

1720

1921

1721

1922

1722

1923

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1729

1930

use_ipv6: Boolean; to use IPv6 or not

1730

1931

"""

1731

1932

def __init__(self, server_address, RequestHandlerClass,

1732

interface=None, use_ipv6=True):

1933

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

1934

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

1935

creating a new one with socket.socket().

1936

"""

1733

1937

self.interface = interface

1734

1938

if use_ipv6:

1735

1939

self.address_family = socket.AF_INET6

1940

if socketfd is not None:

1941

# Save the file descriptor

1942

self.socketfd = socketfd

1943

# Save the original socket.socket() function

1944

self.socket_socket = socket.socket

1945

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

1946

#

1947

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

1948

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

1949

# patching socket.socket.)

1950

#

1951

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

1952

@functools.wraps(socket.socket)

1953

def socket_wrapper(*args, **kwargs):

1954

# Restore original function so subsequent calls are

1955

# not affected.

1956

socket.socket = self.socket_socket

1957

del self.socket_socket

1958

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

1959

# saved file descriptor.

1960

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

1961

# Replace socket.socket() function with wrapper

1962

socket.socket = socket_wrapper

1963

# The socketserver.TCPServer.__init__ will call

1964

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

1965

# socket_wrapper(), if socketfd was set.

1736

1966

socketserver.TCPServer.__init__(self, server_address,

1737

1967

RequestHandlerClass)

1968

1738

1969

def server_bind(self):

1739

1970

"""This overrides the normal server_bind() function

1740

1971

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

1748

1979

try:

1749

1980

self.socket.setsockopt(socket.SOL_SOCKET,

1750

1981

SO_BINDTODEVICE,

1751

str(self.interface

1752

+ '\0'))

1982

str(self.interface + '\0'))

1753

1983

except socket.error as error:

1754

if error[0] == errno.EPERM:

1755

logger.error("No permission to"

1756

" bind to interface %s",

1757

self.interface)

1758

elif error[0] == errno.ENOPROTOOPT:

1984

if error.errno == errno.EPERM:

1985

logger.error("No permission to bind to"

1986

" interface %s", self.interface)

1987

elif error.errno == errno.ENOPROTOOPT:

1759

1988

logger.error("SO_BINDTODEVICE not available;"

1760

1989

" cannot bind to interface %s",

1761

1990

self.interface)

1991

elif error.errno == errno.ENODEV:

1992

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

1993

" cannot bind", self.interface)

1762

1994

else:

1763

1995

raise

1764

1996

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

1767

1999

if self.address_family == socket.AF_INET6:

1768

2000

any_address = "::" # in6addr_any

1769

2001

else:

1770

any_address = socket.INADDR_ANY

2002

any_address = "0.0.0.0" # INADDR_ANY

1771

2003

self.server_address = (any_address,

1772

2004

self.server_address[1])

1773

2005

elif not self.server_address[1]:

1794

2026

"""

1795

2027

def __init__(self, server_address, RequestHandlerClass,

1796

2028

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

1797

gnutls_priority=None, use_dbus=True):

2029

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

1798

2030

self.enabled = False

1799

2031

self.clients = clients

1800

2032

if self.clients is None:

1804

2036

IPv6_TCPServer.__init__(self, server_address,

1805

2037

RequestHandlerClass,

1806

2038

interface = interface,

1807

use_ipv6 = use_ipv6)

2039

use_ipv6 = use_ipv6,

2040

socketfd = socketfd)

1808

2041

def server_activate(self):

1809

2042

if self.enabled:

1810

2043

return socketserver.TCPServer.server_activate(self)

1823

2056

1824

2057

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

1825

2058

proc = None, client_object=None):

1826

condition_names = {

1827

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

1828

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

1829

# blocking).

1830

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

1831

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

1832

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

1833

# broken, usually for pipes and

1834

# sockets).

1835

}

1836

conditions_string = ' | '.join(name

1837

for cond, name in

1838

condition_names.iteritems()

1839

if cond & condition)

1840

2059

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

1841

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

2060

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

1842

2061

# Wait for other process to exit

1843

2062

proc.join()

1844

2063

return False

1902

2121

return True

1903

2122

1904

2123

2124

def rfc3339_duration_to_delta(duration):

2125

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

2126

2127

>>> rfc3339_duration_to_delta("P7D")

2128

datetime.timedelta(7)

2129

>>> rfc3339_duration_to_delta("PT60S")

2130

datetime.timedelta(0, 60)

2131

>>> rfc3339_duration_to_delta("PT60M")

2132

datetime.timedelta(0, 3600)

2133

>>> rfc3339_duration_to_delta("PT24H")

2134

datetime.timedelta(1)

2135

>>> rfc3339_duration_to_delta("P1W")

2136

datetime.timedelta(7)

2137

>>> rfc3339_duration_to_delta("PT5M30S")

2138

datetime.timedelta(0, 330)

2139

>>> rfc3339_duration_to_delta("P1DT3M20S")

2140

datetime.timedelta(1, 200)

2141

"""

2142

2143

# Parsing an RFC 3339 duration with regular expressions is not

2144

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

2145

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

2146

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

2147

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

2148

# avoid excessive use of external libraries.

2149

2150

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

2151

Token = collections.namedtuple("Token",

2152

("regexp", # To match token; if

2153

# "value" is not None,

2154

# must have a "group"

2155

# containing digits

2156

"value", # datetime.timedelta or

2157

# None

2158

"followers")) # Tokens valid after

2159

# this token

2160

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

2161

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

2162

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

2163

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

2164

datetime.timedelta(seconds=1),

2165

frozenset((token_end,)))

2166

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

2167

datetime.timedelta(minutes=1),

2168

frozenset((token_second, token_end)))

2169

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

2170

datetime.timedelta(hours=1),

2171

frozenset((token_minute, token_end)))

2172

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

2173

None,

2174

frozenset((token_hour, token_minute,

2175

token_second)))

2176

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

2177

datetime.timedelta(days=1),

2178

frozenset((token_time, token_end)))

2179

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

2180

datetime.timedelta(weeks=4),

2181

frozenset((token_day, token_end)))

2182

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

2183

datetime.timedelta(weeks=52),

2184

frozenset((token_month, token_end)))

2185

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

2186

datetime.timedelta(weeks=1),

2187

frozenset((token_end,)))

2188

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

2189

frozenset((token_year, token_month,

2190

token_day, token_time,

2191

token_week))),

2192

# Define starting values

2193

value = datetime.timedelta() # Value so far

2194

found_token = None

2195

followers = frozenset(token_duration,) # Following valid tokens

2196

s = duration # String left to parse

2197

# Loop until end token is found

2198

while found_token is not token_end:

2199

# Search for any currently valid tokens

2200

for token in followers:

2201

match = token.regexp.match(s)

2202

if match is not None:

2203

# Token found

2204

if token.value is not None:

2205

# Value found, parse digits

2206

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

2207

# Add to value so far

2208

value += factor * token.value

2209

# Strip token from string

2210

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

2211

# Go to found token

2212

found_token = token

2213

# Set valid next tokens

2214

followers = found_token.followers

2215

break

2216

else:

2217

# No currently valid tokens were found

2218

raise ValueError("Invalid RFC 3339 duration")

2219

# End token found

2220

return value

2221

2222

1905

2223

def string_to_delta(interval):

1906

2224

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

1907

2225

1918

2236

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

1919

2237

datetime.timedelta(0, 330)

1920

2238

"""

2239

2240

try:

2241

return rfc3339_duration_to_delta(interval)

2242

except ValueError:

2243

pass

2244

1921

2245

timevalue = datetime.timedelta(0)

1922

2246

for s in interval.split():

1923

2247

try:

1934

2258

elif suffix == "w":

1935

2259

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

1936

2260

else:

1937

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

1938

except (ValueError, IndexError) as e:

2261

raise ValueError("Unknown suffix {0!r}"

2262

.format(suffix))

2263

except IndexError as e:

1939

2264

raise ValueError(*(e.args))

1940

2265

timevalue += delta

1941

2266

return timevalue

1954

2279

sys.exit()

1955

2280

if not noclose:

1956

2281

# Close all standard open file descriptors

1957

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

2282

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

1958

2283

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

1959

2284

raise OSError(errno.ENODEV,

1960

"%s not a character device"

1961

% os.path.devnull)

2285

"{0} not a character device"

2286

.format(os.devnull))

1962

2287

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

1963

2288

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

1964

2289

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

1973

2298

1974

2299

parser = argparse.ArgumentParser()

1975

2300

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

1976

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

2301

version = "%(prog)s {0}".format(version),

1977

2302

help="show version number and exit")

1978

2303

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

1979

2304

help="Bind to interface IF")

1985

2310

help="Run self-test")

1986

2311

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

1987

2312

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

1988

" to terminal")

2313

" to terminal", default=None)

1989

2314

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

1990

2315

help="Debug level for stdout output")

1991

2316

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

1998

2323

" files")

1999

2324

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

2000

2325

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

2001

" system bus interface")

2326

" system bus interface", default=None)

2002

2327

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

2003

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

2328

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

2329

default=None)

2004

2330

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

2005

2331

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

2006

" state")

2332

" state", default=None)

2333

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

2334

help="Specify a file descriptor to a network"

2335

" socket to use instead of creating one")

2007

2336

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

2008

2337

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

2338

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

2339

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

2340

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

2341

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

2342

default=None)

2009

2343

2010

2344

options = parser.parse_args()

2011

2345

2012

2346

if options.check:

2013

2347

import doctest

2014

doctest.testmod()

2015

sys.exit()

2348

fail_count, test_count = doctest.testmod()

2349

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

2016

2350

2017

2351

# Default values for config file for server-global settings

2018

2352

server_defaults = { "interface": "",

2020

2354

"port": "",

2021

2355

"debug": "False",

2022

2356

"priority":

2023

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

2357

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

2024

2358

"servicename": "Mandos",

2025

2359

"use_dbus": "True",

2026

2360

"use_ipv6": "True",

2027

2361

"debuglevel": "",

2028

2362

"restore": "True",

2029

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

2363

"socket": "",

2364

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

2365

"foreground": "False",

2366

"zeroconf": "True",

2030

2367

}

2031

2368

2032

2369

# Parse config file for server-global settings

2037

2374

# Convert the SafeConfigParser object to a dict

2038

2375

server_settings = server_config.defaults()

2039

2376

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

2040

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

2377

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

2041

2378

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

2042

2379

option)

2043

2380

if server_settings["port"]:

2044

2381

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

2045

2382

"port")

2383

if server_settings["socket"]:

2384

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

2385

"socket")

2386

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

2387

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

2388

# happen with a supplied network socket.

2389

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

2390

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

2391

["socket"])

2046

2392

del server_config

2047

2393

2048

2394

# Override the settings from the config file with command line

2050

2396

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

2051

2397

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

2052

2398

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

2053

"statedir"):

2399

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

2054

2400

value = getattr(options, option)

2055

2401

if value is not None:

2056

2402

server_settings[option] = value

2059

2405

for option in server_settings.keys():

2060

2406

if type(server_settings[option]) is str:

2061

2407

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

2408

# Force all boolean options to be boolean

2409

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

2410

"foreground", "zeroconf"):

2411

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

2412

# Debug implies foreground

2413

if server_settings["debug"]:

2414

server_settings["foreground"] = True

2062

2415

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

2063

2416

2064

2417

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

2065

2418

2419

if (not server_settings["zeroconf"] and

2420

not (server_settings["port"]

2421

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

2422

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

2423

" Zeroconf")

2424

2066

2425

# For convenience

2067

2426

debug = server_settings["debug"]

2068

2427

debuglevel = server_settings["debuglevel"]

2070

2429

use_ipv6 = server_settings["use_ipv6"]

2071

2430

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

2072

2431

stored_state_file)

2432

foreground = server_settings["foreground"]

2433

zeroconf = server_settings["zeroconf"]

2073

2434

2074

2435

if debug:

2075

2436

initlogger(debug, logging.DEBUG)

2082

2443

2083

2444

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

2084

2445

syslogger.setFormatter(logging.Formatter

2085

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

2086

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

2087

% server_settings["servicename"]))

2446

('Mandos ({0}) [%(process)d]:'

2447

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

2448

.format(server_settings

2449

["servicename"])))

2088

2450

2089

2451

# Parse config file with clients

2090

2452

client_config = configparser.SafeConfigParser(Client

2095

2457

global mandos_dbus_service

2096

2458

mandos_dbus_service = None

2097

2459

2460

socketfd = None

2461

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

2462

socketfd = server_settings["socket"]

2098

2463

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

2099

2464

server_settings["port"]),

2100

2465

ClientHandler,

2103

2468

use_ipv6=use_ipv6,

2104

2469

gnutls_priority=

2105

2470

server_settings["priority"],

2106

use_dbus=use_dbus)

2107

if not debug:

2108

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

2471

use_dbus=use_dbus,

2472

socketfd=socketfd)

2473

if not foreground:

2474

pidfilename = "/run/mandos.pid"

2475

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

2476

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

2477

pidfile = None

2109

2478

try:

2110

2479

pidfile = open(pidfilename, "w")

2111

except IOError:

2112

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

2480

except IOError as e:

2481

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

2482

exc_info=e)

2113

2483

2114

try:

2115

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

2116

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

2117

except KeyError:

2484

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

2118

2485

try:

2119

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

2120

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

2486

uid = pwd.getpwnam(name).pw_uid

2487

gid = pwd.getpwnam(name).pw_gid

2488

break

2121

2489

except KeyError:

2122

try:

2123

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

2124

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

2125

except KeyError:

2126

uid = 65534

2127

gid = 65534

2490

continue

2491

else:

2492

uid = 65534

2493

gid = 65534

2128

2494

try:

2129

2495

os.setgid(gid)

2130

2496

os.setuid(uid)

2131

2497

except OSError as error:

2132

if error[0] != errno.EPERM:

2133

raise error

2498

if error.errno != errno.EPERM:

2499

raise

2134

2500

2135

2501

if debug:

2136

2502

# Enable all possible GnuTLS debugging

2147

2513

.gnutls_global_set_log_function(debug_gnutls))

2148

2514

2149

2515

# Redirect stdin so all checkers get /dev/null

2150

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

2516

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

2151

2517

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

2152

2518

if null > 2:

2153

2519

os.close(null)

2154

2520

2155

2521

# Need to fork before connecting to D-Bus

2156

if not debug:

2522

if not foreground:

2157

2523

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

2158

2524

daemon()

2159

2525

2526

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

2527

# need to inform gobject that threads will be used.

2160

2528

gobject.threads_init()

2161

2529

2162

2530

global main_loop

2163

2531

# From the Avahi example code

2164

DBusGMainLoop(set_as_default=True )

2532

DBusGMainLoop(set_as_default=True)

2165

2533

main_loop = gobject.MainLoop()

2166

2534

bus = dbus.SystemBus()

2167

2535

# End of Avahi example code

2173

2541

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

2174

2542

do_not_queue=True))

2175

2543

except dbus.exceptions.NameExistsException as e:

2176

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

2544

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

2177

2545

use_dbus = False

2178

2546

server_settings["use_dbus"] = False

2179

2547

tcp_server.use_dbus = False

2180

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2181

service = AvahiServiceToSyslog(name =

2182

server_settings["servicename"],

2183

servicetype = "_mandos._tcp",

2184

protocol = protocol, bus = bus)

2185

if server_settings["interface"]:

2186

service.interface = (if_nametoindex

2187

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

2548

if zeroconf:

2549

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2550

service = AvahiServiceToSyslog(name =

2551

server_settings["servicename"],

2552

servicetype = "_mandos._tcp",

2553

protocol = protocol, bus = bus)

2554

if server_settings["interface"]:

2555

service.interface = (if_nametoindex

2556

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

2188

2557

2189

2558

global multiprocessing_manager

2190

2559

multiprocessing_manager = multiprocessing.Manager()

2191

2560

2192

2561

client_class = Client

2193

2562

if use_dbus:

2194

client_class = functools.partial(ClientDBusTransitional,

2195

bus = bus)

2563

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

2196

2564

2197

2565

client_settings = Client.config_parser(client_config)

2198

2566

old_client_settings = {}

2199

2567

clients_data = {}

2200

2568

2569

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

2570

global wnull

2571

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

2572

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

2573

# mode

2574

if debug or not foreground:

2575

wnull.close()

2576

2201

2577

# Get client data and settings from last running state.

2202

2578

if server_settings["restore"]:

2203

2579

try:

2206

2582

(stored_state))

2207

2583

os.remove(stored_state_path)

2208

2584

except IOError as e:

2209

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

2210

.format(e))

2211

if e.errno != errno.ENOENT:

2585

if e.errno == errno.ENOENT:

2586

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

2587

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

2588

else:

2589

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

2590

exc_info=e)

2212

2591

raise

2213

2592

except EOFError as e:

2214

2593

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

2215

"EOFError: {0}".format(e))

2594

"EOFError:", exc_info=e)

2216

2595

2217

2596

with PGPEngine() as pgp:

2218

2597

for client_name, client in clients_data.iteritems():

2598

# Skip removed clients

2599

if client_name not in client_settings:

2600

continue

2601

2219

2602

# Decide which value to use after restoring saved state.

2220

2603

# We have three different values: Old config file,

2221

2604

# new config file, and saved state.

2271

2654

.format(client_name))

2272

2655

client["secret"] = (

2273

2656

client_settings[client_name]["secret"])

2274

2275

2657

2276

2658

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

2277

2659

for client_name in (set(old_client_settings)

2280

2662

for client_name in (set(client_settings)

2281

2663

- set(old_client_settings)):

2282

2664

clients_data[client_name] = client_settings[client_name]

2283

2665

2284

2666

# Create all client objects

2285

2667

for client_name, client in clients_data.iteritems():

2286

2668

tcp_server.clients[client_name] = client_class(

2287

name = client_name, settings = client)

2669

name = client_name, settings = client,

2670

server_settings = server_settings)

2288

2671

2289

2672

if not tcp_server.clients:

2290

2673

logger.warning("No clients defined")

2291

2292

if not debug:

2293

try:

2294

with pidfile:

2295

pid = os.getpid()

2296

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

2297

del pidfile

2298

except IOError:

2299

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

2300

pidfilename, pid)

2301

except NameError:

2302

# "pidfile" was never created

2303

pass

2674

2675

if not foreground:

2676

if pidfile is not None:

2677

try:

2678

with pidfile:

2679

pid = os.getpid()

2680

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

2681

except IOError:

2682

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

2683

pidfilename, pid)

2684

del pidfile

2304

2685

del pidfilename

2305

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

2306

2686

2307

2687

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

2308

2688

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

2309

2689

2310

2690

if use_dbus:

2311

class MandosDBusService(dbus.service.Object):

2691

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

2692

"se.bsnet.fukt.Mandos"})

2693

class MandosDBusService(DBusObjectWithProperties):

2312

2694

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

2313

2695

def __init__(self):

2314

2696

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

2315

2697

_interface = "se.recompile.Mandos"

2316

2698

2699

@dbus_interface_annotations(_interface)

2700

def _foo(self):

2701

return { "org.freedesktop.DBus.Property"

2702

".EmitsChangedSignal":

2703

"false"}

2704

2317

2705

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

2318

2706

def ClientAdded(self, objpath):

2319

2707

"D-Bus signal"

2361

2749

2362

2750

del _interface

2363

2751

2364

class MandosDBusServiceTransitional(MandosDBusService):

2365

__metaclass__ = AlternateDBusNamesMetaclass

2366

mandos_dbus_service = MandosDBusServiceTransitional()

2752

mandos_dbus_service = MandosDBusService()

2367

2753

2368

2754

def cleanup():

2369

2755

"Cleanup function; run on exit"

2370

service.cleanup()

2756

if zeroconf:

2757

service.cleanup()

2371

2758

2372

2759

multiprocessing.active_children()

2760

wnull.close()

2373

2761

if not (tcp_server.clients or client_settings):

2374

2762

return

2375

2763

2387

2775

# A list of attributes that can not be pickled

2388

2776

# + secret.

2389

2777

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

2390

"checker"))

2778

"checker", "server_settings"))

2391

2779

for name, typ in (inspect.getmembers

2392

2780

(dbus.service.Object)):

2393

2781

exclude.add(name)

2402

2790

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

2403

2791

2404

2792

try:

2405

tempfd, tempname = tempfile.mkstemp(suffix=".pickle",

2406

prefix="clients-",

2407

dir=os.path.dirname

2408

(stored_state_path))

2409

with os.fdopen(tempfd, "wb") as stored_state:

2793

with (tempfile.NamedTemporaryFile

2794

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

2795

dir=os.path.dirname(stored_state_path),

2796

delete=False)) as stored_state:

2410

2797

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

2798

tempname=stored_state.name

2411

2799

os.rename(tempname, stored_state_path)

2412

2800

except (IOError, OSError) as e:

2413

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

2414

.format(e))

2415

2801

if not debug:

2416

2802

try:

2417

2803

os.remove(tempname)

2418

2804

except NameError:

2419

2805

pass

2420

if e.errno not in set((errno.ENOENT, errno.EACCES,

2421

errno.EEXIST)):

2422

raise e

2806

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

2807

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

2808

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

2809

else:

2810

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

2811

exc_info=e)

2812

raise

2423

2813

2424

2814

# Delete all clients, and settings from config

2425

2815

while tcp_server.clients:

2449

2839

tcp_server.server_activate()

2450

2840

2451

2841

# Find out what port we got

2452

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

2842

if zeroconf:

2843

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

2453

2844

if use_ipv6:

2454

2845

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

2455

" flowinfo %d, scope_id %d"

2456

% tcp_server.socket.getsockname())

2846

" flowinfo %d, scope_id %d",

2847

*tcp_server.socket.getsockname())

2457

2848

else: # IPv4

2458

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

2459

% tcp_server.socket.getsockname())

2849

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

2850

*tcp_server.socket.getsockname())

2460

2851

2461

2852

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

2462

2853

2463

2854

try:

2464

# From the Avahi example code

2465

try:

2466

service.activate()

2467

except dbus.exceptions.DBusException as error:

2468

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

2469

cleanup()

2470

sys.exit(1)

2471

# End of Avahi example code

2855

if zeroconf:

2856

# From the Avahi example code

2857

try:

2858

service.activate()

2859

except dbus.exceptions.DBusException as error:

2860

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

2861

cleanup()

2862

sys.exit(1)

2863

# End of Avahi example code

2472

2864

2473

2865

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

2474

2866

lambda *args, **kwargs:

2478

2870

logger.debug("Starting main loop")

2479

2871

main_loop.run()

2480

2872

except AvahiError as error:

2481

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

2873

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

2482

2874

cleanup()

2483

2875

sys.exit(1)

2484

2876

except KeyboardInterrupt: