/mandos/trunk : revision 556

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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 = "1.6.5"

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version = "1.5.2"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = None

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

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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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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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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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: {0!s}"

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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

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

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.format(self.name)))

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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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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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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"extended_timeout": "15m",

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"interval": "2m",

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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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"approval_delay": "0s",

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"approval_duration": "1s",

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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 {0}"

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.format(section))

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

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% 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["last_checker_status"] = -2

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return settings

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

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def __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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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()

581

if not quiet:

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

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

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

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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", None) is not None:

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

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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()

613

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self.enabled = False

614

if not quiet:

615

self.send_changedstate()

616

592

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

617

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return False

618

594

622

598

def init_checker(self):

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599

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

624

600

# and every interval from then on.

625

if self.checker_initiator_tag is not None:

626

gobject.source_remove(self.checker_initiator_tag)

627

601

self.checker_initiator_tag = (gobject.timeout_add

628

602

(self.interval_milliseconds(),

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603

self.start_checker))

630

604

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

631

if self.disable_initiator_tag is not None:

632

gobject.source_remove(self.disable_initiator_tag)

633

605

self.disable_initiator_tag = (gobject.timeout_add

634

606

(self.timeout_milliseconds(),

635

607

self.disable))

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638

timeout = self.timeout

667

639

if self.disable_initiator_tag is not None:

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640

gobject.source_remove(self.disable_initiator_tag)

669

self.disable_initiator_tag = None

670

641

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

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642

self.disable_initiator_tag = (gobject.timeout_add

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643

(timedelta_to_milliseconds

682

653

If a checker already exists, leave it running and do

683

654

nothing."""

684

655

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

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

656

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

657

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

658

# client would inevitably timeout, since no checker would get

659

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

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660

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

690

661

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

691

662

# should be.

693

664

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

694

665

try:

695

666

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

696

except AttributeError:

697

pass

698

except OSError as error:

699

if error.errno != errno.ECHILD:

700

raise

667

except (AttributeError, OSError) as error:

668

if (isinstance(error, OSError)

669

and error.errno != errno.ECHILD):

670

raise error

701

671

else:

702

672

if pid:

703

673

logger.warning("Checker was a zombie")

706

676

self.current_checker_command)

707

677

# Start a new checker if needed

708

678

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)

714

679

try:

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

680

# In case checker_command has exactly one % operator

681

command = self.checker_command % self.host

682

except TypeError:

683

# Escape attributes for the shell

684

escaped_attrs = dict(

685

(attr,

686

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

687

errors=

688

'replace')))

689

for attr in

690

self.runtime_expansions)

691

692

try:

693

command = self.checker_command % escaped_attrs

694

except TypeError as error:

695

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

696

' %s', self.checker_command, error)

697

return True # Try again later

720

698

self.current_checker_command = command

721

699

try:

722

700

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

725

703

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

726

704

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

727

705

# 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 })

736

706

self.checker = subprocess.Popen(command,

737

707

close_fds=True,

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:

708

shell=True, cwd="/")

709

self.checker_callback_tag = (gobject.child_watch_add

710

(self.checker.pid,

711

self.checker_callback,

712

data=command))

713

# The checker may have completed before the gobject

714

# watch was added. Check for this.

751

715

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

716

if pid:

717

gobject.source_remove(self.checker_callback_tag)

718

self.checker_callback(pid, status, command)

752

719

except OSError as 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)

720

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

721

error)

762

722

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

763

723

return True

764

724

771

731

return

772

732

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

773

733

try:

774

self.checker.terminate()

734

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

775

735

#time.sleep(0.5)

776

736

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

777

# self.checker.kill()

737

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

778

738

except OSError as error:

779

739

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

780

740

raise

797

757

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

798

758

if byte_arrays and signature != "ay":

799

759

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

800

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

760

" signature %r" % signature)

801

761

def decorator(func):

802

762

func._dbus_is_property = True

803

763

func._dbus_interface = dbus_interface

811

771

return decorator

812

772

813

773

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

851

774

class DBusPropertyException(dbus.exceptions.DBusException):

852

775

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

853

776

"""

876

799

"""

877

800

878

801

@staticmethod

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)

802

def _is_dbus_property(obj):

803

return getattr(obj, "_dbus_is_property", False)

887

804

888

def _get_all_dbus_things(self, thing):

805

def _get_all_dbus_properties(self):

889

806

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

890

807

"""

891

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

892

name),

893

athing.__get__(self))

808

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

894

809

for cls in self.__class__.__mro__

895

for name, athing in

896

inspect.getmembers(cls,

897

self._is_dbus_thing(thing)))

810

for name, prop in

811

inspect.getmembers(cls, self._is_dbus_property))

898

812

899

813

def _get_dbus_property(self, interface_name, property_name):

900

814

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

902

816

"""

903

817

for cls in self.__class__.__mro__:

904

818

for name, value in (inspect.getmembers

905

(cls,

906

self._is_dbus_thing("property"))):

819

(cls, self._is_dbus_property)):

907

820

if (value._dbus_name == property_name

908

821

and value._dbus_interface == interface_name):

909

822

return value.__get__(self)

937

850

# The byte_arrays option is not supported yet on

938

851

# signatures other than "ay".

939

852

if prop._dbus_signature != "ay":

940

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

941

"'ay' signature {0!r}"

942

.format(prop._dbus_signature))

853

raise ValueError

943

854

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

944

855

for byte in value))

945

856

prop(value)

953

864

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

954

865

"""

955

866

properties = {}

956

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

867

for name, prop in self._get_all_dbus_properties():

957

868

if (interface_name

958

869

and interface_name != prop._dbus_interface):

959

870

# Interface non-empty but did not match

974

885

path_keyword='object_path',

975

886

connection_keyword='connection')

976

887

def Introspect(self, object_path, connection):

977

"""Overloading of standard D-Bus method.

978

979

Inserts property tags and interface annotation tags.

888

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

980

889

"""

981

890

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

982

891

connection)

989

898

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

990

899

return e

991

900

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

992

# Add property tags

993

901

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

994

902

for name, prop

995

in self._get_all_dbus_things("property")

903

in self._get_all_dbus_properties()

996

904

if prop._dbus_interface

997

905

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

998

906

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)

1030

907

# Add the names to the return values for the

1031

908

# "org.freedesktop.DBus.Properties" methods

1032

909

if (if_tag.getAttribute("name")

1047

924

except (AttributeError, xml.dom.DOMException,

1048

925

xml.parsers.expat.ExpatError) as error:

1049

926

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

1050

exc_info=error)

927

error)

1051

928

return xmlstring

1052

929

1053

930

1054

def datetime_to_dbus(dt, variant_level=0):

931

def datetime_to_dbus (dt, variant_level=0):

1055

932

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

1056

933

if dt is None:

1057

934

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

1059

936

variant_level=variant_level)

1060

937

1061

938

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).

939

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

940

.__metaclass__):

941

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

942

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

1084

943

"""

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):

944

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

945

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

946

# methods, signals, or properties in them

947

for base in (b for b in bases

948

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

949

# Go though all attributes of the base class

950

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

1092

951

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

1093

952

# with the wrong interface name

1094

953

if (not hasattr(attribute, "_dbus_interface")

1095

954

or not attribute._dbus_interface

1096

.startswith(orig_interface_name)):

955

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

1097

956

continue

1098

957

# Create an alternate D-Bus interface name based on

1099

958

# the current name

1100

959

alt_interface = (attribute._dbus_interface

1101

.replace(orig_interface_name,

1102

alt_interface_name))

1103

interface_names.add(alt_interface)

960

.replace("se.recompile.Mandos",

961

"se.bsnet.fukt.Mandos"))

1104

962

# Is this a D-Bus signal?

1105

963

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

1106

# Extract the original non-method undecorated

1107

# function by black magic

964

# Extract the original non-method function by

965

# black magic

1108

966

nonmethod_func = (dict(

1109

967

zip(attribute.func_code.co_freevars,

1110

968

attribute.__closure__))["func"]

1121

979

nonmethod_func.func_name,

1122

980

nonmethod_func.func_defaults,

1123

981

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

1130

982

# Define a creator of a function to call both the

1131

# original and alternate functions, so both the

1132

# original and alternate signals gets sent when

1133

# the function is called

983

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

984

# signals gets sent when the function is called

1134

985

def fixscope(func1, func2):

1135

986

"""This function is a scope container to pass

1136

987

func1 and func2 to the "call_both" function

1143

994

return call_both

1144

995

# Create the "call_both" function and add it to

1145

996

# the class

1146

attr[attrname] = fixscope(attribute, new_function)

997

attr[attrname] = fixscope(attribute,

998

new_function)

1147

999

# Is this a D-Bus method?

1148

1000

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

1149

1001

# Create a new, but exactly alike, function

1160

1012

attribute.func_name,

1161

1013

attribute.func_defaults,

1162

1014

attribute.func_closure)))

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1169

1015

# Is this a D-Bus property?

1170

1016

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

1171

1017

# Create a new, but exactly alike, function

1185

1031

attribute.func_name,

1186

1032

attribute.func_defaults,

1187

1033

attribute.func_closure)))

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"})

1034

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

1035

1036

1233

1037

class ClientDBus(Client, DBusObjectWithProperties):

1234

1038

"""A Client class using D-Bus

1235

1039

1255

1059

("/clients/" + client_object_name))

1256

1060

DBusObjectWithProperties.__init__(self, self.bus,

1257

1061

self.dbus_object_path)

1258

1062

1259

1063

def notifychangeproperty(transform_func,

1260

1064

dbus_name, type_func=lambda x: x,

1261

1065

variant_level=1):

1284

1088

1285

1089

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

1286

1090

1091

1287

1092

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1288

1093

approvals_pending = notifychangeproperty(dbus.Boolean,

1289

1094

"ApprovalPending",

1353

1158

*args, **kwargs)

1354

1159

1355

1160

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

1356

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

1161

old_checker = self.checker

1162

if self.checker is not None:

1163

old_checker_pid = self.checker.pid

1164

else:

1165

old_checker_pid = None

1357

1166

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

1358

1167

# Only if new checker process was started

1359

1168

if (self.checker is not None

1367

1176

return False

1368

1177

1369

1178

def approve(self, value=True):

1179

self.send_changedstate()

1370

1180

self.approved = value

1371

1181

gobject.timeout_add(timedelta_to_milliseconds

1372

1182

(self.approval_duration),

1373

1183

self._reset_approved)

1374

self.send_changedstate()

1184

1375

1185

1376

1186

## D-Bus methods, signals & properties

1377

1187

_interface = "se.recompile.Mandos.Client"

1378

1188

1379

## Interfaces

1380

1381

@dbus_interface_annotations(_interface)

1382

def _foo(self):

1383

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

1384

"false"}

1385

1386

1189

## Signals

1387

1190

1388

1191

# CheckerCompleted - signal

1561

1364

def Timeout_dbus_property(self, value=None):

1562

1365

if value is None: # get

1563

1366

return dbus.UInt64(self.timeout_milliseconds())

1564

old_timeout = self.timeout

1565

1367

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

1566

# Reschedule disabling

1368

# Reschedule timeout

1567

1369

if self.enabled:

1568

1370

now = datetime.datetime.utcnow()

1569

self.expires += self.timeout - old_timeout

1570

if self.expires <= now:

1371

time_to_die = timedelta_to_milliseconds(

1372

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

1373

if time_to_die <= 0:

1571

1374

# The timeout has passed

1572

1375

self.disable()

1573

1376

else:

1377

self.expires = (now +

1378

datetime.timedelta(milliseconds =

1379

time_to_die))

1574

1380

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

1575

1381

is None):

1576

1382

return

1577

1383

gobject.source_remove(self.disable_initiator_tag)

1578

self.disable_initiator_tag = (

1579

gobject.timeout_add(

1580

timedelta_to_milliseconds(self.expires - now),

1581

self.disable))

1384

self.disable_initiator_tag = (gobject.timeout_add

1385

(time_to_die,

1386

self.disable))

1582

1387

1583

1388

# ExtendedTimeout - property

1584

1389

@dbus_service_property(_interface, signature="t",

1663

1468

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

1664

1469

1665

1470

1471

class ClientDBusTransitional(ClientDBus):

1472

__metaclass__ = AlternateDBusNamesMetaclass

1473

1474

1666

1475

class ClientHandler(socketserver.BaseRequestHandler, object):

1667

1476

"""A class to handle client connections.

1668

1477

1704

1513

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

1705

1514

try:

1706

1515

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

1707

raise RuntimeError(line)

1516

raise RuntimeError

1708

1517

except (ValueError, IndexError, RuntimeError) as error:

1709

1518

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

1710

1519

return

1772

1581

#wait until timeout or approved

1773

1582

time = datetime.datetime.now()

1774

1583

client.changedstate.acquire()

1775

client.changedstate.wait(

1776

float(timedelta_to_milliseconds(delay)

1777

/ 1000))

1584

(client.changedstate.wait

1585

(float(client.timedelta_to_milliseconds(delay)

1586

/ 1000)))

1778

1587

client.changedstate.release()

1779

1588

time2 = datetime.datetime.now()

1780

1589

if (time2 - time) >= delay:

1796

1605

try:

1797

1606

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

1798

1607

except gnutls.errors.GNUTLSError as error:

1799

logger.warning("gnutls send failed",

1800

exc_info=error)

1608

logger.warning("gnutls send failed")

1801

1609

return

1802

1610

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

1803

1611

sent, len(client.secret)

1817

1625

try:

1818

1626

session.bye()

1819

1627

except gnutls.errors.GNUTLSError as error:

1820

logger.warning("GnuTLS bye failed",

1821

exc_info=error)

1628

logger.warning("GnuTLS bye failed")

1822

1629

1823

1630

@staticmethod

1824

1631

def peer_certificate(session):

1896

1703

def process_request(self, request, address):

1897

1704

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

1898

1705

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

1899

args = (request, address))

1706

args = (request,

1707

address))

1900

1708

proc.start()

1901

1709

return proc

1902

1710

1917

1725

1918

1726

def add_pipe(self, parent_pipe, proc):

1919

1727

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

1920

raise NotImplementedError()

1728

raise NotImplementedError

1921

1729

1922

1730

1923

1731

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1930

1738

use_ipv6: Boolean; to use IPv6 or not

1931

1739

"""

1932

1740

def __init__(self, server_address, RequestHandlerClass,

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

"""

1741

interface=None, use_ipv6=True):

1937

1742

self.interface = interface

1938

1743

if use_ipv6:

1939

1744

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.

1966

1745

socketserver.TCPServer.__init__(self, server_address,

1967

1746

RequestHandlerClass)

1968

1969

1747

def server_bind(self):

1970

1748

"""This overrides the normal server_bind() function

1971

1749

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

1979

1757

try:

1980

1758

self.socket.setsockopt(socket.SOL_SOCKET,

1981

1759

SO_BINDTODEVICE,

1982

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

1760

str(self.interface

1761

+ '\0'))

1983

1762

except socket.error as error:

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:

1763

if error[0] == errno.EPERM:

1764

logger.error("No permission to"

1765

" bind to interface %s",

1766

self.interface)

1767

elif error[0] == errno.ENOPROTOOPT:

1988

1768

logger.error("SO_BINDTODEVICE not available;"

1989

1769

" cannot bind to interface %s",

1990

1770

self.interface)

1991

elif error.errno == errno.ENODEV:

1992

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

1993

" cannot bind", self.interface)

1994

1771

else:

1995

1772

raise

1996

1773

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

1999

1776

if self.address_family == socket.AF_INET6:

2000

1777

any_address = "::" # in6addr_any

2001

1778

else:

2002

any_address = "0.0.0.0" # INADDR_ANY

1779

any_address = socket.INADDR_ANY

2003

1780

self.server_address = (any_address,

2004

1781

self.server_address[1])

2005

1782

elif not self.server_address[1]:

2026

1803

"""

2027

1804

def __init__(self, server_address, RequestHandlerClass,

2028

1805

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

2029

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

1806

gnutls_priority=None, use_dbus=True):

2030

1807

self.enabled = False

2031

1808

self.clients = clients

2032

1809

if self.clients is None:

2036

1813

IPv6_TCPServer.__init__(self, server_address,

2037

1814

RequestHandlerClass,

2038

1815

interface = interface,

2039

use_ipv6 = use_ipv6,

2040

socketfd = socketfd)

1816

use_ipv6 = use_ipv6)

2041

1817

def server_activate(self):

2042

1818

if self.enabled:

2043

1819

return socketserver.TCPServer.server_activate(self)

2056

1832

2057

1833

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

2058

1834

proc = None, client_object=None):

1835

condition_names = {

1836

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

1837

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

1838

# blocking).

1839

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

1840

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

1841

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

1842

# broken, usually for pipes and

1843

# sockets).

1844

}

1845

conditions_string = ' | '.join(name

1846

for cond, name in

1847

condition_names.iteritems()

1848

if cond & condition)

2059

1849

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

2060

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

1850

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

2061

1851

# Wait for other process to exit

2062

1852

proc.join()

2063

1853

return False

2121

1911

return True

2122

1912

2123

1913

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

2223

1914

def string_to_delta(interval):

2224

1915

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

2225

1916

2236

1927

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

2237

1928

datetime.timedelta(0, 330)

2238

1929

"""

2239

2240

try:

2241

return rfc3339_duration_to_delta(interval)

2242

except ValueError:

2243

pass

2244

2245

1930

timevalue = datetime.timedelta(0)

2246

1931

for s in interval.split():

2247

1932

try:

2258

1943

elif suffix == "w":

2259

1944

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

2260

1945

else:

2261

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

2262

.format(suffix))

2263

except IndexError as e:

1946

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

1947

except (ValueError, IndexError) as e:

2264

1948

raise ValueError(*(e.args))

2265

1949

timevalue += delta

2266

1950

return timevalue

2279

1963

sys.exit()

2280

1964

if not noclose:

2281

1965

# Close all standard open file descriptors

2282

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

1966

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

2283

1967

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

2284

1968

raise OSError(errno.ENODEV,

2285

"{0} not a character device"

2286

.format(os.devnull))

1969

"%s not a character device"

1970

% os.path.devnull)

2287

1971

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

2288

1972

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

2289

1973

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

2298

1982

2299

1983

parser = argparse.ArgumentParser()

2300

1984

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

2301

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

1985

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

2302

1986

help="show version number and exit")

2303

1987

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

2304

1988

help="Bind to interface IF")

2310

1994

help="Run self-test")

2311

1995

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

2312

1996

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

2313

" to terminal", default=None)

1997

" to terminal")

2314

1998

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

2315

1999

help="Debug level for stdout output")

2316

2000

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

2323

2007

" files")

2324

2008

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

2325

2009

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

2326

" system bus interface", default=None)

2010

" system bus interface")

2327

2011

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

2328

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

2329

default=None)

2012

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

2330

2013

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

2331

2014

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

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")

2015

" state")

2336

2016

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

2337

2017

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

2338

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

2339

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

2340

2018

2341

2019

options = parser.parse_args()

2342

2020

2343

2021

if options.check:

2344

2022

import doctest

2345

fail_count, test_count = doctest.testmod()

2346

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

2023

doctest.testmod()

2024

sys.exit()

2347

2025

2348

2026

# Default values for config file for server-global settings

2349

2027

server_defaults = { "interface": "",

2351

2029

"port": "",

2352

2030

"debug": "False",

2353

2031

"priority":

2354

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

2032

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

2355

2033

"servicename": "Mandos",

2356

2034

"use_dbus": "True",

2357

2035

"use_ipv6": "True",

2358

2036

"debuglevel": "",

2359

2037

"restore": "True",

2360

"socket": "",

2361

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

2362

"foreground": "False",

2038

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

2363

2039

}

2364

2040

2365

2041

# Parse config file for server-global settings

2370

2046

# Convert the SafeConfigParser object to a dict

2371

2047

server_settings = server_config.defaults()

2372

2048

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

2373

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

2049

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

2374

2050

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

2375

2051

option)

2376

2052

if server_settings["port"]:

2377

2053

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

2378

2054

"port")

2379

if server_settings["socket"]:

2380

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

2381

"socket")

2382

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

2383

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

2384

# happen with a supplied network socket.

2385

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

2386

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

2387

["socket"])

2388

2055

del server_config

2389

2056

2390

2057

# Override the settings from the config file with command line

2392

2059

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

2393

2060

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

2394

2061

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

2395

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

2062

"statedir"):

2396

2063

value = getattr(options, option)

2397

2064

if value is not None:

2398

2065

server_settings[option] = value

2401

2068

for option in server_settings.keys():

2402

2069

if type(server_settings[option]) is str:

2403

2070

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

2404

# Force all boolean options to be boolean

2405

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

2406

"foreground"):

2407

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

2408

# Debug implies foreground

2409

if server_settings["debug"]:

2410

server_settings["foreground"] = True

2411

2071

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

2412

2072

2413

2073

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

2419

2079

use_ipv6 = server_settings["use_ipv6"]

2420

2080

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

2421

2081

stored_state_file)

2422

foreground = server_settings["foreground"]

2423

2082

2424

2083

if debug:

2425

2084

initlogger(debug, logging.DEBUG)

2432

2091

2433

2092

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

2434

2093

syslogger.setFormatter(logging.Formatter

2435

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

2436

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

2437

.format(server_settings

2438

["servicename"])))

2094

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

2095

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

2096

% server_settings["servicename"]))

2439

2097

2440

2098

# Parse config file with clients

2441

2099

client_config = configparser.SafeConfigParser(Client

2454

2112

use_ipv6=use_ipv6,

2455

2113

gnutls_priority=

2456

2114

server_settings["priority"],

2457

use_dbus=use_dbus,

2458

socketfd=(server_settings["socket"]

2459

or None))

2460

if not foreground:

2461

pidfilename = "/run/mandos.pid"

2462

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

2463

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

2464

pidfile = None

2115

use_dbus=use_dbus)

2116

if not debug:

2117

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

2465

2118

try:

2466

2119

pidfile = open(pidfilename, "w")

2467

except IOError as e:

2468

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

2469

exc_info=e)

2120

except IOError:

2121

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

2470

2122

2471

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

2123

try:

2124

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

2125

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

2126

except KeyError:

2472

2127

try:

2473

uid = pwd.getpwnam(name).pw_uid

2474

gid = pwd.getpwnam(name).pw_gid

2475

break

2128

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

2129

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

2476

2130

except KeyError:

2477

continue

2478

else:

2479

uid = 65534

2480

gid = 65534

2131

try:

2132

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

2133

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

2134

except KeyError:

2135

uid = 65534

2136

gid = 65534

2481

2137

try:

2482

2138

os.setgid(gid)

2483

2139

os.setuid(uid)

2484

2140

except OSError as error:

2485

if error.errno != errno.EPERM:

2486

raise

2141

if error[0] != errno.EPERM:

2142

raise error

2487

2143

2488

2144

if debug:

2489

2145

# Enable all possible GnuTLS debugging

2500

2156

.gnutls_global_set_log_function(debug_gnutls))

2501

2157

2502

2158

# Redirect stdin so all checkers get /dev/null

2503

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

2159

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

2504

2160

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

2505

2161

if null > 2:

2506

2162

os.close(null)

2507

2163

2508

2164

# Need to fork before connecting to D-Bus

2509

if not foreground:

2165

if not debug:

2510

2166

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

2511

2167

daemon()

2512

2168

2513

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

2514

# need to inform gobject that threads will be used.

2515

2169

gobject.threads_init()

2516

2170

2517

2171

global main_loop

2518

2172

# From the Avahi example code

2519

DBusGMainLoop(set_as_default=True)

2173

DBusGMainLoop(set_as_default=True )

2520

2174

main_loop = gobject.MainLoop()

2521

2175

bus = dbus.SystemBus()

2522

2176

# End of Avahi example code

2528

2182

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

2529

2183

do_not_queue=True))

2530

2184

except dbus.exceptions.NameExistsException as e:

2531

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

2185

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

2532

2186

use_dbus = False

2533

2187

server_settings["use_dbus"] = False

2534

2188

tcp_server.use_dbus = False

2546

2200

2547

2201

client_class = Client

2548

2202

if use_dbus:

2549

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

2203

client_class = functools.partial(ClientDBusTransitional,

2204

bus = bus)

2550

2205

2551

2206

client_settings = Client.config_parser(client_config)

2552

2207

old_client_settings = {}

2553

2208

clients_data = {}

2554

2209

2555

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

2556

global wnull

2557

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

2558

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

2559

# mode

2560

if debug or not foreground:

2561

wnull.close()

2562

2563

2210

# Get client data and settings from last running state.

2564

2211

if server_settings["restore"]:

2565

2212

try:

2568

2215

(stored_state))

2569

2216

os.remove(stored_state_path)

2570

2217

except IOError as e:

2571

if e.errno == errno.ENOENT:

2572

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

2573

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

2574

else:

2575

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

2576

exc_info=e)

2218

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

2219

.format(e))

2220

if e.errno != errno.ENOENT:

2577

2221

raise

2578

2222

except EOFError as e:

2579

2223

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

2580

"EOFError:", exc_info=e)

2224

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

2581

2225

2582

2226

with PGPEngine() as pgp:

2583

2227

for client_name, client in clients_data.iteritems():

2584

# Skip removed clients

2585

if client_name not in client_settings:

2586

continue

2587

2588

2228

# Decide which value to use after restoring saved state.

2589

2229

# We have three different values: Old config file,

2590

2230

# new config file, and saved state.

2640

2280

.format(client_name))

2641

2281

client["secret"] = (

2642

2282

client_settings[client_name]["secret"])

2283

2643

2284

2644

2285

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

2645

2286

for client_name in (set(old_client_settings)

2648

2289

for client_name in (set(client_settings)

2649

2290

- set(old_client_settings)):

2650

2291

clients_data[client_name] = client_settings[client_name]

2651

2292

2652

2293

# Create all client objects

2653

2294

for client_name, client in clients_data.iteritems():

2654

2295

tcp_server.clients[client_name] = client_class(

2655

name = client_name, settings = client,

2656

server_settings = server_settings)

2296

name = client_name, settings = client)

2657

2297

2658

2298

if not tcp_server.clients:

2659

2299

logger.warning("No clients defined")

2660

2661

if not foreground:

2662

if pidfile is not None:

2663

try:

2664

with pidfile:

2665

pid = os.getpid()

2666

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

2667

except IOError:

2668

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

2669

pidfilename, pid)

2670

del pidfile

2300

2301

if not debug:

2302

try:

2303

with pidfile:

2304

pid = os.getpid()

2305

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

2306

del pidfile

2307

except IOError:

2308

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

2309

pidfilename, pid)

2310

except NameError:

2311

# "pidfile" was never created

2312

pass

2671

2313

del pidfilename

2314

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

2672

2315

2673

2316

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

2674

2317

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

2675

2318

2676

2319

if use_dbus:

2677

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

2678

"se.bsnet.fukt.Mandos"})

2679

class MandosDBusService(DBusObjectWithProperties):

2320

class MandosDBusService(dbus.service.Object):

2680

2321

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

2681

2322

def __init__(self):

2682

2323

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

2683

2324

_interface = "se.recompile.Mandos"

2684

2325

2685

@dbus_interface_annotations(_interface)

2686

def _foo(self):

2687

return { "org.freedesktop.DBus.Property"

2688

".EmitsChangedSignal":

2689

"false"}

2690

2691

2326

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

2692

2327

def ClientAdded(self, objpath):

2693

2328

"D-Bus signal"

2735

2370

2736

2371

del _interface

2737

2372

2738

mandos_dbus_service = MandosDBusService()

2373

class MandosDBusServiceTransitional(MandosDBusService):

2374

__metaclass__ = AlternateDBusNamesMetaclass

2375

mandos_dbus_service = MandosDBusServiceTransitional()

2739

2376

2740

2377

def cleanup():

2741

2378

"Cleanup function; run on exit"

2742

2379

service.cleanup()

2743

2380

2744

2381

multiprocessing.active_children()

2745

wnull.close()

2746

2382

if not (tcp_server.clients or client_settings):

2747

2383

return

2748

2384

2760

2396

# A list of attributes that can not be pickled

2761

2397

# + secret.

2762

2398

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

2763

"checker", "server_settings"))

2399

"checker"))

2764

2400

for name, typ in (inspect.getmembers

2765

2401

(dbus.service.Object)):

2766

2402

exclude.add(name)

2775

2411

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

2776

2412

2777

2413

try:

2778

with (tempfile.NamedTemporaryFile

2779

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

2780

dir=os.path.dirname(stored_state_path),

2781

delete=False)) as stored_state:

2414

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

2415

prefix="clients-",

2416

dir=os.path.dirname

2417

(stored_state_path))

2418

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

2782

2419

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

2783

tempname=stored_state.name

2784

2420

os.rename(tempname, stored_state_path)

2785

2421

except (IOError, OSError) as e:

2422

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

2423

.format(e))

2786

2424

if not debug:

2787

2425

try:

2788

2426

os.remove(tempname)

2789

2427

except NameError:

2790

2428

pass

2791

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

2792

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

2793

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

2794

else:

2795

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

2796

exc_info=e)

2797

raise

2429

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

2430

errno.EEXIST)):

2431

raise e

2798

2432

2799

2433

# Delete all clients, and settings from config

2800

2434

while tcp_server.clients:

2827

2461

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

2828

2462

if use_ipv6:

2829

2463

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

2830

" flowinfo %d, scope_id %d",

2831

*tcp_server.socket.getsockname())

2464

" flowinfo %d, scope_id %d"

2465

% tcp_server.socket.getsockname())

2832

2466

else: # IPv4

2833

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

2834

*tcp_server.socket.getsockname())

2467

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

2468

% tcp_server.socket.getsockname())

2835

2469

2836

2470

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

2837

2471

2840

2474

try:

2841

2475

service.activate()

2842

2476

except dbus.exceptions.DBusException as error:

2843

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

2477

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

2844

2478

cleanup()

2845

2479

sys.exit(1)

2846

2480

# End of Avahi example code

2853

2487

logger.debug("Starting main loop")

2854

2488

main_loop.run()

2855

2489

except AvahiError as error:

2856

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

2490

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

2857

2491

cleanup()

2858

2492

sys.exit(1)

2859

2493

except KeyboardInterrupt: