/mandos/release : revision 295

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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 = "1.6.4"

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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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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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last_checked_ok: datetime.datetime(); (UTC) or None

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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checker, or None.

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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", "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["checker_command"] = section["checker"]

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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client["last_checker_status"] = None

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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

602

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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:

587

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

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gobject.source_remove(self.checker_initiator_tag)

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589

self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

613

if not quiet:

614

self.send_changedstate()

615

592

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

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600

# and every interval from then on.

624

if self.checker_initiator_tag is not None:

625

gobject.source_remove(self.checker_initiator_tag)

626

601

self.checker_initiator_tag = (gobject.timeout_add

627

602

(self.interval_milliseconds(),

628

603

self.start_checker))

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

630

if self.disable_initiator_tag is not None:

631

gobject.source_remove(self.disable_initiator_tag)

632

605

self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

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

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vars(self))

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628

656

def checked_ok(self):

657

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

658

self.last_checked_ok = datetime.datetime.utcnow()

659

self.last_checker_status = 0

660

self.bump_timeout()

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def bump_timeout(self, timeout=None):

663

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

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,

633

alive and well.

634

"""

664

635

if timeout is None:

665

636

timeout = self.timeout

637

self.last_checked_ok = datetime.datetime.utcnow()

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638

if self.disable_initiator_tag is not None:

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639

gobject.source_remove(self.disable_initiator_tag)

668

self.disable_initiator_tag = None

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640

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

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641

self.disable_initiator_tag = (gobject.timeout_add

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642

(timedelta_to_milliseconds

681

652

If a checker already exists, leave it running and do

682

653

nothing."""

683

654

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

684

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

685

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

686

# would inevitably timeout, since no checker would get a

687

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

655

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

656

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

657

# client would inevitably timeout, since no checker would get

658

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

688

659

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

689

660

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

690

661

# should be.

692

663

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

693

664

try:

694

665

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

695

except AttributeError:

696

pass

697

except OSError as error:

698

if error.errno != errno.ECHILD:

699

raise

666

except (AttributeError, OSError) as error:

667

if (isinstance(error, OSError)

668

and error.errno != errno.ECHILD):

669

raise error

700

670

else:

701

671

if pid:

702

672

logger.warning("Checker was a zombie")

705

675

self.current_checker_command)

706

676

# Start a new checker if needed

707

677

if self.checker is None:

708

# Escape attributes for the shell

709

escaped_attrs = dict(

710

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

711

for attr in

712

self.runtime_expansions)

713

678

try:

714

command = self.checker_command % escaped_attrs

715

except TypeError as error:

716

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

717

self.checker_command, exc_info=error)

718

return True # Try again later

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

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697

self.current_checker_command = command

720

698

try:

721

699

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

724

702

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

725

703

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

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704

# always replaced by /dev/null.)

727

# The exception is when not debugging but nevertheless

728

# running in the foreground; use the previously

729

# created wnull.

730

popen_args = {}

731

if (not self.server_settings["debug"]

732

and self.server_settings["foreground"]):

733

popen_args.update({"stdout": wnull,

734

"stderr": wnull })

735

705

self.checker = subprocess.Popen(command,

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706

close_fds=True,

737

shell=True, cwd="/",

738

**popen_args)

739

except OSError as error:

740

logger.error("Failed to start subprocess",

741

exc_info=error)

742

return True

743

self.checker_callback_tag = (gobject.child_watch_add

744

(self.checker.pid,

745

self.checker_callback,

746

data=command))

747

# The checker may have completed before the gobject

748

# watch was added. Check for this.

749

try:

707

shell=True, cwd="/")

708

self.checker_callback_tag = (gobject.child_watch_add

709

(self.checker.pid,

710

self.checker_callback,

711

data=command))

712

# The checker may have completed before the gobject

713

# watch was added. Check for this.

750

714

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)

751

718

except OSError as error:

752

if error.errno == errno.ECHILD:

753

# This should never happen

754

logger.error("Child process vanished",

755

exc_info=error)

756

return True

757

raise

758

if pid:

759

gobject.source_remove(self.checker_callback_tag)

760

self.checker_callback(pid, status, command)

719

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

720

error)

761

721

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

762

722

return True

763

723

770

730

return

771

731

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

772

732

try:

773

self.checker.terminate()

733

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

774

734

#time.sleep(0.5)

775

735

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

776

# self.checker.kill()

736

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

777

737

except OSError as error:

778

738

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

779

739

raise

796

756

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

797

757

if byte_arrays and signature != "ay":

798

758

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

799

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

759

" signature %r" % signature)

800

760

def decorator(func):

801

761

func._dbus_is_property = True

802

762

func._dbus_interface = dbus_interface

810

770

return decorator

811

771

812

772

813

def dbus_interface_annotations(dbus_interface):

814

"""Decorator for marking functions returning interface annotations

815

816

Usage:

817

818

@dbus_interface_annotations("org.example.Interface")

819

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

820

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

821

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

822

"false"}

823

"""

824

def decorator(func):

825

func._dbus_is_interface = True

826

func._dbus_interface = dbus_interface

827

func._dbus_name = dbus_interface

828

return func

829

return decorator

830

831

832

def dbus_annotations(annotations):

833

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

834

Usage:

835

836

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

837

access="r")

838

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

839

"org.freedesktop.DBus.Property."

840

"EmitsChangedSignal": "false"})

841

def Property_dbus_property(self):

842

return dbus.Boolean(False)

843

"""

844

def decorator(func):

845

func._dbus_annotations = annotations

846

return func

847

return decorator

848

849

850

773

class DBusPropertyException(dbus.exceptions.DBusException):

851

774

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

852

775

"""

875

798

"""

876

799

877

800

@staticmethod

878

def _is_dbus_thing(thing):

879

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

880

881

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

882

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

883

"""

884

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

885

False)

801

def _is_dbus_property(obj):

802

return getattr(obj, "_dbus_is_property", False)

886

803

887

def _get_all_dbus_things(self, thing):

804

def _get_all_dbus_properties(self):

888

805

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

889

806

"""

890

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

891

name),

892

athing.__get__(self))

807

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

893

808

for cls in self.__class__.__mro__

894

for name, athing in

895

inspect.getmembers(cls,

896

self._is_dbus_thing(thing)))

809

for name, prop in

810

inspect.getmembers(cls, self._is_dbus_property))

897

811

898

812

def _get_dbus_property(self, interface_name, property_name):

899

813

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

901

815

"""

902

816

for cls in self.__class__.__mro__:

903

817

for name, value in (inspect.getmembers

904

(cls,

905

self._is_dbus_thing("property"))):

818

(cls, self._is_dbus_property)):

906

819

if (value._dbus_name == property_name

907

820

and value._dbus_interface == interface_name):

908

821

return value.__get__(self)

936

849

# The byte_arrays option is not supported yet on

937

850

# signatures other than "ay".

938

851

if prop._dbus_signature != "ay":

939

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

940

"'ay' signature {0!r}"

941

.format(prop._dbus_signature))

852

raise ValueError

942

853

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

943

854

for byte in value))

944

855

prop(value)

952

863

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

953

864

"""

954

865

properties = {}

955

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

866

for name, prop in self._get_all_dbus_properties():

956

867

if (interface_name

957

868

and interface_name != prop._dbus_interface):

958

869

# Interface non-empty but did not match

973

884

path_keyword='object_path',

974

885

connection_keyword='connection')

975

886

def Introspect(self, object_path, connection):

976

"""Overloading of standard D-Bus method.

977

978

Inserts property tags and interface annotation tags.

887

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

979

888

"""

980

889

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

981

890

connection)

988

897

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

989

898

return e

990

899

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

991

# Add property tags

992

900

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

993

901

for name, prop

994

in self._get_all_dbus_things("property")

902

in self._get_all_dbus_properties()

995

903

if prop._dbus_interface

996

904

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

997

905

if_tag.appendChild(tag)

998

# Add annotation tags

999

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

1000

for tag in if_tag.getElementsByTagName(typ):

1001

annots = dict()

1002

for name, prop in (self.

1003

_get_all_dbus_things(typ)):

1004

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

1005

and prop._dbus_interface

1006

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

1007

annots.update(getattr

1008

(prop,

1009

"_dbus_annotations",

1010

{}))

1011

for name, value in annots.iteritems():

1012

ann_tag = document.createElement(

1013

"annotation")

1014

ann_tag.setAttribute("name", name)

1015

ann_tag.setAttribute("value", value)

1016

tag.appendChild(ann_tag)

1017

# Add interface annotation tags

1018

for annotation, value in dict(

1019

itertools.chain.from_iterable(

1020

annotations().iteritems()

1021

for name, annotations in

1022

self._get_all_dbus_things("interface")

1023

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

1024

)).iteritems():

1025

ann_tag = document.createElement("annotation")

1026

ann_tag.setAttribute("name", annotation)

1027

ann_tag.setAttribute("value", value)

1028

if_tag.appendChild(ann_tag)

1029

906

# Add the names to the return values for the

1030

907

# "org.freedesktop.DBus.Properties" methods

1031

908

if (if_tag.getAttribute("name")

1046

923

except (AttributeError, xml.dom.DOMException,

1047

924

xml.parsers.expat.ExpatError) as error:

1048

925

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

1049

exc_info=error)

926

error)

1050

927

return xmlstring

1051

928

1052

929

1053

def datetime_to_dbus(dt, variant_level=0):

930

def datetime_to_dbus (dt, variant_level=0):

1054

931

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

1055

932

if dt is None:

1056

933

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

1058

935

variant_level=variant_level)

1059

936

1060

937

1061

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1062

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

1063

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

1064

interface names according to the "alt_interface_names" mapping.

1065

Usage:

1066

1067

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

1068

"net.example.AlternateInterface"})

1069

class SampleDBusObject(dbus.service.Object):

1070

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

1071

def SampleDBusMethod():

1072

pass

1073

1074

The above "SampleDBusMethod" on "SampleDBusObject" will be

1075

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

1076

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

1077

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

1078

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

1079

1080

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

1081

(from DBusObjectWithProperties) and interfaces (from the

1082

dbus_interface_annotations decorator).

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.

1083

942

"""

1084

def wrapper(cls):

1085

for orig_interface_name, alt_interface_name in (

1086

alt_interface_names.iteritems()):

1087

attr = {}

1088

interface_names = set()

1089

# Go though all attributes of the class

1090

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

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):

1091

950

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

1092

951

# with the wrong interface name

1093

952

if (not hasattr(attribute, "_dbus_interface")

1094

953

or not attribute._dbus_interface

1095

.startswith(orig_interface_name)):

954

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

1096

955

continue

1097

956

# Create an alternate D-Bus interface name based on

1098

957

# the current name

1099

958

alt_interface = (attribute._dbus_interface

1100

.replace(orig_interface_name,

1101

alt_interface_name))

1102

interface_names.add(alt_interface)

959

.replace("se.recompile.Mandos",

960

"se.bsnet.fukt.Mandos"))

1103

961

# Is this a D-Bus signal?

1104

962

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

1105

# Extract the original non-method undecorated

1106

# function by black magic

963

# Extract the original non-method function by

964

# black magic

1107

965

nonmethod_func = (dict(

1108

966

zip(attribute.func_code.co_freevars,

1109

967

attribute.__closure__))["func"]

1120

978

nonmethod_func.func_name,

1121

979

nonmethod_func.func_defaults,

1122

980

nonmethod_func.func_closure)))

1123

# Copy annotations, if any

1124

try:

1125

new_function._dbus_annotations = (

1126

dict(attribute._dbus_annotations))

1127

except AttributeError:

1128

pass

1129

981

# Define a creator of a function to call both the

1130

# original and alternate functions, so both the

1131

# original and alternate signals gets sent when

1132

# the function is called

982

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

983

# signals gets sent when the function is called

1133

984

def fixscope(func1, func2):

1134

985

"""This function is a scope container to pass

1135

986

func1 and func2 to the "call_both" function

1142

993

return call_both

1143

994

# Create the "call_both" function and add it to

1144

995

# the class

1145

attr[attrname] = fixscope(attribute, new_function)

996

attr[attrname] = fixscope(attribute,

997

new_function)

1146

998

# Is this a D-Bus method?

1147

999

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

1148

1000

# Create a new, but exactly alike, function

1159

1011

attribute.func_name,

1160

1012

attribute.func_defaults,

1161

1013

attribute.func_closure)))

1162

# Copy annotations, if any

1163

try:

1164

attr[attrname]._dbus_annotations = (

1165

dict(attribute._dbus_annotations))

1166

except AttributeError:

1167

pass

1168

1014

# Is this a D-Bus property?

1169

1015

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

1170

1016

# Create a new, but exactly alike, function

1184

1030

attribute.func_name,

1185

1031

attribute.func_defaults,

1186

1032

attribute.func_closure)))

1187

# Copy annotations, if any

1188

try:

1189

attr[attrname]._dbus_annotations = (

1190

dict(attribute._dbus_annotations))

1191

except AttributeError:

1192

pass

1193

# Is this a D-Bus interface?

1194

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

1195

# Create a new, but exactly alike, function

1196

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

1197

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

1198

# to the class.

1199

attr[attrname] = (dbus_interface_annotations

1200

(alt_interface)

1201

(types.FunctionType

1202

(attribute.func_code,

1203

attribute.func_globals,

1204

attribute.func_name,

1205

attribute.func_defaults,

1206

attribute.func_closure)))

1207

if deprecate:

1208

# Deprecate all alternate interfaces

1209

iname="_AlternateDBusNames_interface_annotation{0}"

1210

for interface_name in interface_names:

1211

@dbus_interface_annotations(interface_name)

1212

def func(self):

1213

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

1214

"true" }

1215

# Find an unused name

1216

for aname in (iname.format(i)

1217

for i in itertools.count()):

1218

if aname not in attr:

1219

attr[aname] = func

1220

break

1221

if interface_names:

1222

# Replace the class with a new subclass of it with

1223

# methods, signals, etc. as created above.

1224

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

1225

(cls,), attr)

1226

return cls

1227

return wrapper

1228

1229

1230

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

1231

"se.bsnet.fukt.Mandos"})

1033

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

1034

1035

1232

1036

class ClientDBus(Client, DBusObjectWithProperties):

1233

1037

"""A Client class using D-Bus

1234

1038

1254

1058

("/clients/" + client_object_name))

1255

1059

DBusObjectWithProperties.__init__(self, self.bus,

1256

1060

self.dbus_object_path)

1257

1061

1258

1062

def notifychangeproperty(transform_func,

1259

1063

dbus_name, type_func=lambda x: x,

1260

1064

variant_level=1):

1283

1087

1284

1088

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

1285

1089

1090

1286

1091

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1287

1092

approvals_pending = notifychangeproperty(dbus.Boolean,

1288

1093

"ApprovalPending",

1295

1100

checker is not None)

1296

1101

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1297

1102

"LastCheckedOK")

1298

last_checker_status = notifychangeproperty(dbus.Int16,

1299

"LastCheckerStatus")

1300

1103

last_approval_request = notifychangeproperty(

1301

1104

datetime_to_dbus, "LastApprovalRequest")

1302

1105

approved_by_default = notifychangeproperty(dbus.Boolean,

1352

1155

*args, **kwargs)

1353

1156

1354

1157

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

1355

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

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

1163

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

1357

1164

# Only if new checker process was started

1358

1165

if (self.checker is not None

1366

1173

return False

1367

1174

1368

1175

def approve(self, value=True):

1176

self.send_changedstate()

1369

1177

self.approved = value

1370

1178

gobject.timeout_add(timedelta_to_milliseconds

1371

1179

(self.approval_duration),

1372

1180

self._reset_approved)

1373

self.send_changedstate()

1181

1374

1182

1375

1183

## D-Bus methods, signals & properties

1376

1184

_interface = "se.recompile.Mandos.Client"

1377

1185

1378

## Interfaces

1379

1380

@dbus_interface_annotations(_interface)

1381

def _foo(self):

1382

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

1383

"false"}

1384

1385

1186

## Signals

1386

1187

1387

1188

# CheckerCompleted - signal

1538

1339

return

1539

1340

return datetime_to_dbus(self.last_checked_ok)

1540

1341

1541

# LastCheckerStatus - property

1542

@dbus_service_property(_interface, signature="n",

1543

access="read")

1544

def LastCheckerStatus_dbus_property(self):

1545

return dbus.Int16(self.last_checker_status)

1546

1547

1342

# Expires - property

1548

1343

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

1549

1344

def Expires_dbus_property(self):

1560

1355

def Timeout_dbus_property(self, value=None):

1561

1356

if value is None: # get

1562

1357

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1564

1358

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

1565

# Reschedule disabling

1359

# Reschedule timeout

1566

1360

if self.enabled:

1567

1361

now = datetime.datetime.utcnow()

1568

self.expires += self.timeout - old_timeout

1569

if self.expires <= now:

1362

time_to_die = timedelta_to_milliseconds(

1363

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

1364

if time_to_die <= 0:

1570

1365

# The timeout has passed

1571

1366

self.disable()

1572

1367

else:

1368

self.expires = (now +

1369

datetime.timedelta(milliseconds =

1370

time_to_die))

1573

1371

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

1574

1372

is None):

1575

1373

return

1576

1374

gobject.source_remove(self.disable_initiator_tag)

1577

self.disable_initiator_tag = (

1578

gobject.timeout_add(

1579

timedelta_to_milliseconds(self.expires - now),

1580

self.disable))

1375

self.disable_initiator_tag = (gobject.timeout_add

1376

(time_to_die,

1377

self.disable))

1581

1378

1582

1379

# ExtendedTimeout - property

1583

1380

@dbus_service_property(_interface, signature="t",

1662

1459

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

1663

1460

1664

1461

1462

class ClientDBusTransitional(ClientDBus):

1463

__metaclass__ = AlternateDBusNamesMetaclass

1464

1465

1665

1466

class ClientHandler(socketserver.BaseRequestHandler, object):

1666

1467

"""A class to handle client connections.

1667

1468

1703

1504

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

1704

1505

try:

1705

1506

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

1706

raise RuntimeError(line)

1507

raise RuntimeError

1707

1508

except (ValueError, IndexError, RuntimeError) as error:

1708

1509

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

1709

1510

return

1771

1572

#wait until timeout or approved

1772

1573

time = datetime.datetime.now()

1773

1574

client.changedstate.acquire()

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1575

(client.changedstate.wait

1576

(float(client.timedelta_to_milliseconds(delay)

1577

/ 1000)))

1777

1578

client.changedstate.release()

1778

1579

time2 = datetime.datetime.now()

1779

1580

if (time2 - time) >= delay:

1795

1596

try:

1796

1597

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

1797

1598

except gnutls.errors.GNUTLSError as error:

1798

logger.warning("gnutls send failed",

1799

exc_info=error)

1599

logger.warning("gnutls send failed")

1800

1600

return

1801

1601

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

1802

1602

sent, len(client.secret)

1805

1605

1806

1606

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

1807

1607

# bump the timeout using extended_timeout

1808

client.bump_timeout(client.extended_timeout)

1608

client.checked_ok(client.extended_timeout)

1809

1609

if self.server.use_dbus:

1810

1610

# Emit D-Bus signal

1811

1611

client.GotSecret()

1816

1616

try:

1817

1617

session.bye()

1818

1618

except gnutls.errors.GNUTLSError as error:

1819

logger.warning("GnuTLS bye failed",

1820

exc_info=error)

1619

logger.warning("GnuTLS bye failed")

1821

1620

1822

1621

@staticmethod

1823

1622

def peer_certificate(session):

1895

1694

def process_request(self, request, address):

1896

1695

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

1897

1696

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

1898

args = (request, address))

1697

args = (request,

1698

address))

1899

1699

proc.start()

1900

1700

return proc

1901

1701

1916

1716

1917

1717

def add_pipe(self, parent_pipe, proc):

1918

1718

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

1919

raise NotImplementedError()

1719

raise NotImplementedError

1920

1720

1921

1721

1922

1722

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1929

1729

use_ipv6: Boolean; to use IPv6 or not

1930

1730

"""

1931

1731

def __init__(self, server_address, RequestHandlerClass,

1932

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

1933

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

1934

creating a new one with socket.socket().

1935

"""

1732

interface=None, use_ipv6=True):

1936

1733

self.interface = interface

1937

1734

if use_ipv6:

1938

1735

self.address_family = socket.AF_INET6

1939

if socketfd is not None:

1940

# Save the file descriptor

1941

self.socketfd = socketfd

1942

# Save the original socket.socket() function

1943

self.socket_socket = socket.socket

1944

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

1945

#

1946

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

1947

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

1948

# patching socket.socket.)

1949

#

1950

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

1951

@functools.wraps(socket.socket)

1952

def socket_wrapper(*args, **kwargs):

1953

# Restore original function so subsequent calls are

1954

# not affected.

1955

socket.socket = self.socket_socket

1956

del self.socket_socket

1957

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

1958

# saved file descriptor.

1959

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

1960

# Replace socket.socket() function with wrapper

1961

socket.socket = socket_wrapper

1962

# The socketserver.TCPServer.__init__ will call

1963

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

1964

# socket_wrapper(), if socketfd was set.

1965

1736

socketserver.TCPServer.__init__(self, server_address,

1966

1737

RequestHandlerClass)

1967

1968

1738

def server_bind(self):

1969

1739

"""This overrides the normal server_bind() function

1970

1740

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

1978

1748

try:

1979

1749

self.socket.setsockopt(socket.SOL_SOCKET,

1980

1750

SO_BINDTODEVICE,

1981

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

1751

str(self.interface

1752

+ '\0'))

1982

1753

except socket.error as error:

1983

if error.errno == errno.EPERM:

1984

logger.error("No permission to bind to"

1985

" interface %s", self.interface)

1986

elif error.errno == errno.ENOPROTOOPT:

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:

1987

1759

logger.error("SO_BINDTODEVICE not available;"

1988

1760

" cannot bind to interface %s",

1989

1761

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

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

1992

" cannot bind", self.interface)

1993

1762

else:

1994

1763

raise

1995

1764

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

1998

1767

if self.address_family == socket.AF_INET6:

1999

1768

any_address = "::" # in6addr_any

2000

1769

else:

2001

any_address = "0.0.0.0" # INADDR_ANY

1770

any_address = socket.INADDR_ANY

2002

1771

self.server_address = (any_address,

2003

1772

self.server_address[1])

2004

1773

elif not self.server_address[1]:

2025

1794

"""

2026

1795

def __init__(self, server_address, RequestHandlerClass,

2027

1796

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

2028

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

1797

gnutls_priority=None, use_dbus=True):

2029

1798

self.enabled = False

2030

1799

self.clients = clients

2031

1800

if self.clients is None:

2035

1804

IPv6_TCPServer.__init__(self, server_address,

2036

1805

RequestHandlerClass,

2037

1806

interface = interface,

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1807

use_ipv6 = use_ipv6)

2040

1808

def server_activate(self):

2041

1809

if self.enabled:

2042

1810

return socketserver.TCPServer.server_activate(self)

2055

1823

2056

1824

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

2057

1825

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)

2058

1840

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

2059

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

1841

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

2060

1842

# Wait for other process to exit

2061

1843

proc.join()

2062

1844

return False

2120

1902

return True

2121

1903

2122

1904

2123

def rfc3339_duration_to_delta(duration):

2124

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

2125

2126

>>> rfc3339_duration_to_delta("P7D")

2127

datetime.timedelta(7)

2128

>>> rfc3339_duration_to_delta("PT60S")

2129

datetime.timedelta(0, 60)

2130

>>> rfc3339_duration_to_delta("PT60M")

2131

datetime.timedelta(0, 3600)

2132

>>> rfc3339_duration_to_delta("PT24H")

2133

datetime.timedelta(1)

2134

>>> rfc3339_duration_to_delta("P1W")

2135

datetime.timedelta(7)

2136

>>> rfc3339_duration_to_delta("PT5M30S")

2137

datetime.timedelta(0, 330)

2138

>>> rfc3339_duration_to_delta("P1DT3M20S")

2139

datetime.timedelta(1, 200)

2140

"""

2141

2142

# Parsing an RFC 3339 duration with regular expressions is not

2143

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

2144

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

2145

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

2146

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

2147

# avoid excessive use of external libraries.

2148

2149

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

2150

Token = collections.namedtuple("Token",

2151

("regexp", # To match token; if

2152

# "value" is not None,

2153

# must have a "group"

2154

# containing digits

2155

"value", # datetime.timedelta or

2156

# None

2157

"followers")) # Tokens valid after

2158

# this token

2159

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

2160

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

2161

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

2162

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

2163

datetime.timedelta(seconds=1),

2164

frozenset((token_end,)))

2165

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

2166

datetime.timedelta(minutes=1),

2167

frozenset((token_second, token_end)))

2168

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

2169

datetime.timedelta(hours=1),

2170

frozenset((token_minute, token_end)))

2171

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

2172

None,

2173

frozenset((token_hour, token_minute,

2174

token_second)))

2175

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

2176

datetime.timedelta(days=1),

2177

frozenset((token_time, token_end)))

2178

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

2179

datetime.timedelta(weeks=4),

2180

frozenset((token_day, token_end)))

2181

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

2182

datetime.timedelta(weeks=52),

2183

frozenset((token_month, token_end)))

2184

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

2185

datetime.timedelta(weeks=1),

2186

frozenset((token_end,)))

2187

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

2188

frozenset((token_year, token_month,

2189

token_day, token_time,

2190

token_week))),

2191

# Define starting values

2192

value = datetime.timedelta() # Value so far

2193

found_token = None

2194

followers = frozenset(token_duration,) # Following valid tokens

2195

s = duration # String left to parse

2196

# Loop until end token is found

2197

while found_token is not token_end:

2198

# Search for any currently valid tokens

2199

for token in followers:

2200

match = token.regexp.match(s)

2201

if match is not None:

2202

# Token found

2203

if token.value is not None:

2204

# Value found, parse digits

2205

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

2206

# Add to value so far

2207

value += factor * token.value

2208

# Strip token from string

2209

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

2210

# Go to found token

2211

found_token = token

2212

# Set valid next tokens

2213

followers = found_token.followers

2214

break

2215

else:

2216

# No currently valid tokens were found

2217

raise ValueError("Invalid RFC 3339 duration")

2218

# End token found

2219

return value

2220

2221

2222

1905

def string_to_delta(interval):

2223

1906

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

2224

1907

2235

1918

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

2236

1919

datetime.timedelta(0, 330)

2237

1920

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

2244

1921

timevalue = datetime.timedelta(0)

2245

1922

for s in interval.split():

2246

1923

try:

2257

1934

elif suffix == "w":

2258

1935

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

2259

1936

else:

2260

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

2261

.format(suffix))

2262

except IndexError as e:

1937

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

1938

except (ValueError, IndexError) as e:

2263

1939

raise ValueError(*(e.args))

2264

1940

timevalue += delta

2265

1941

return timevalue

2278

1954

sys.exit()

2279

1955

if not noclose:

2280

1956

# Close all standard open file descriptors

2281

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

1957

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

2282

1958

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

2283

1959

raise OSError(errno.ENODEV,

2284

"{0} not a character device"

2285

.format(os.devnull))

1960

"%s not a character device"

1961

% os.path.devnull)

2286

1962

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

2287

1963

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

2288

1964

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

2297

1973

2298

1974

parser = argparse.ArgumentParser()

2299

1975

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

2300

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

1976

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

2301

1977

help="show version number and exit")

2302

1978

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

2303

1979

help="Bind to interface IF")

2309

1985

help="Run self-test")

2310

1986

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

2311

1987

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

2312

" to terminal", default=None)

1988

" to terminal")

2313

1989

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

2314

1990

help="Debug level for stdout output")

2315

1991

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

2322

1998

" files")

2323

1999

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

2324

2000

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

2325

" system bus interface", default=None)

2001

" system bus interface")

2326

2002

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

2327

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

2328

default=None)

2003

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

2329

2004

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

2330

2005

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

2331

" state", default=None)

2332

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

2333

help="Specify a file descriptor to a network"

2334

" socket to use instead of creating one")

2006

" state")

2335

2007

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

2336

2008

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

2337

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

2338

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

2339

2009

2340

2010

options = parser.parse_args()

2341

2011

2342

2012

if options.check:

2343

2013

import doctest

2344

fail_count, test_count = doctest.testmod()

2345

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

2014

doctest.testmod()

2015

sys.exit()

2346

2016

2347

2017

# Default values for config file for server-global settings

2348

2018

server_defaults = { "interface": "",

2350

2020

"port": "",

2351

2021

"debug": "False",

2352

2022

"priority":

2353

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

2023

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

2354

2024

"servicename": "Mandos",

2355

2025

"use_dbus": "True",

2356

2026

"use_ipv6": "True",

2357

2027

"debuglevel": "",

2358

2028

"restore": "True",

2359

"socket": "",

2360

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

2361

"foreground": "False",

2029

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

2362

2030

}

2363

2031

2364

2032

# Parse config file for server-global settings

2369

2037

# Convert the SafeConfigParser object to a dict

2370

2038

server_settings = server_config.defaults()

2371

2039

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

2372

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

2040

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

2373

2041

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

2374

2042

option)

2375

2043

if server_settings["port"]:

2376

2044

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

2377

2045

"port")

2378

if server_settings["socket"]:

2379

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

2380

"socket")

2381

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

2382

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

2383

# happen with a supplied network socket.

2384

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

2385

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

2386

["socket"])

2387

2046

del server_config

2388

2047

2389

2048

# Override the settings from the config file with command line

2391

2050

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

2392

2051

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

2393

2052

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

2394

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

2053

"statedir"):

2395

2054

value = getattr(options, option)

2396

2055

if value is not None:

2397

2056

server_settings[option] = value

2400

2059

for option in server_settings.keys():

2401

2060

if type(server_settings[option]) is str:

2402

2061

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

2403

# Force all boolean options to be boolean

2404

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

2405

"foreground"):

2406

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

2407

# Debug implies foreground

2408

if server_settings["debug"]:

2409

server_settings["foreground"] = True

2410

2062

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

2411

2063

2412

2064

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

2418

2070

use_ipv6 = server_settings["use_ipv6"]

2419

2071

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

2420

2072

stored_state_file)

2421

foreground = server_settings["foreground"]

2422

2073

2423

2074

if debug:

2424

2075

initlogger(debug, logging.DEBUG)

2431

2082

2432

2083

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

2433

2084

syslogger.setFormatter(logging.Formatter

2434

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

2435

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

2436

.format(server_settings

2437

["servicename"])))

2085

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

2086

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

2087

% server_settings["servicename"]))

2438

2088

2439

2089

# Parse config file with clients

2440

2090

client_config = configparser.SafeConfigParser(Client

2453

2103

use_ipv6=use_ipv6,

2454

2104

gnutls_priority=

2455

2105

server_settings["priority"],

2456

use_dbus=use_dbus,

2457

socketfd=(server_settings["socket"]

2458

or None))

2459

if not foreground:

2460

pidfilename = "/run/mandos.pid"

2461

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

2462

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

2463

pidfile = None

2106

use_dbus=use_dbus)

2107

if not debug:

2108

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

2464

2109

try:

2465

2110

pidfile = open(pidfilename, "w")

2466

except IOError as e:

2467

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

2468

exc_info=e)

2111

except IOError:

2112

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

2469

2113

2470

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

2114

try:

2115

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

2116

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

2117

except KeyError:

2471

2118

try:

2472

uid = pwd.getpwnam(name).pw_uid

2473

gid = pwd.getpwnam(name).pw_gid

2474

break

2119

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

2120

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

2475

2121

except KeyError:

2476

continue

2477

else:

2478

uid = 65534

2479

gid = 65534

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

2480

2128

try:

2481

2129

os.setgid(gid)

2482

2130

os.setuid(uid)

2483

2131

except OSError as error:

2484

if error.errno != errno.EPERM:

2485

raise

2132

if error[0] != errno.EPERM:

2133

raise error

2486

2134

2487

2135

if debug:

2488

2136

# Enable all possible GnuTLS debugging

2499

2147

.gnutls_global_set_log_function(debug_gnutls))

2500

2148

2501

2149

# Redirect stdin so all checkers get /dev/null

2502

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

2150

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

2503

2151

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

2504

2152

if null > 2:

2505

2153

os.close(null)

2506

2154

2507

2155

# Need to fork before connecting to D-Bus

2508

if not foreground:

2156

if not debug:

2509

2157

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

2510

2158

daemon()

2511

2159

2512

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

2513

# need to inform gobject that threads will be used.

2514

2160

gobject.threads_init()

2515

2161

2516

2162

global main_loop

2517

2163

# From the Avahi example code

2518

DBusGMainLoop(set_as_default=True)

2164

DBusGMainLoop(set_as_default=True )

2519

2165

main_loop = gobject.MainLoop()

2520

2166

bus = dbus.SystemBus()

2521

2167

# End of Avahi example code

2527

2173

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

2528

2174

do_not_queue=True))

2529

2175

except dbus.exceptions.NameExistsException as e:

2530

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

2176

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

2531

2177

use_dbus = False

2532

2178

server_settings["use_dbus"] = False

2533

2179

tcp_server.use_dbus = False

2545

2191

2546

2192

client_class = Client

2547

2193

if use_dbus:

2548

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

2194

client_class = functools.partial(ClientDBusTransitional,

2195

bus = bus)

2549

2196

2550

2197

client_settings = Client.config_parser(client_config)

2551

2198

old_client_settings = {}

2552

2199

clients_data = {}

2553

2200

2554

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

2555

global wnull

2556

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

2557

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

2558

# mode

2559

if debug or not foreground:

2560

wnull.close()

2561

2562

2201

# Get client data and settings from last running state.

2563

2202

if server_settings["restore"]:

2564

2203

try:

2567

2206

(stored_state))

2568

2207

os.remove(stored_state_path)

2569

2208

except IOError as e:

2570

if e.errno == errno.ENOENT:

2571

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

2572

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

2573

else:

2574

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

2575

exc_info=e)

2209

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

2210

.format(e))

2211

if e.errno != errno.ENOENT:

2576

2212

raise

2577

2213

except EOFError as e:

2578

2214

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

2579

"EOFError:", exc_info=e)

2215

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

2580

2216

2581

2217

with PGPEngine() as pgp:

2582

2218

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2587

2219

# Decide which value to use after restoring saved state.

2588

2220

# We have three different values: Old config file,

2589

2221

# new config file, and saved state.

2639

2271

.format(client_name))

2640

2272

client["secret"] = (

2641

2273

client_settings[client_name]["secret"])

2274

2642

2275

2643

2276

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

2644

2277

for client_name in (set(old_client_settings)

2647

2280

for client_name in (set(client_settings)

2648

2281

- set(old_client_settings)):

2649

2282

clients_data[client_name] = client_settings[client_name]

2650

2283

2651

2284

# Create all client objects

2652

2285

for client_name, client in clients_data.iteritems():

2653

2286

tcp_server.clients[client_name] = client_class(

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2287

name = client_name, settings = client)

2656

2288

2657

2289

if not tcp_server.clients:

2658

2290

logger.warning("No clients defined")

2659

2660

if not foreground:

2661

if pidfile is not None:

2662

try:

2663

with pidfile:

2664

pid = os.getpid()

2665

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

2666

except IOError:

2667

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

2668

pidfilename, pid)

2669

del pidfile

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

2670

2304

del pidfilename

2305

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

2671

2306

2672

2307

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

2673

2308

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

2674

2309

2675

2310

if use_dbus:

2676

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

2677

"se.bsnet.fukt.Mandos"})

2678

class MandosDBusService(DBusObjectWithProperties):

2311

class MandosDBusService(dbus.service.Object):

2679

2312

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

2680

2313

def __init__(self):

2681

2314

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

2682

2315

_interface = "se.recompile.Mandos"

2683

2316

2684

@dbus_interface_annotations(_interface)

2685

def _foo(self):

2686

return { "org.freedesktop.DBus.Property"

2687

".EmitsChangedSignal":

2688

"false"}

2689

2690

2317

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

2691

2318

def ClientAdded(self, objpath):

2692

2319

"D-Bus signal"

2734

2361

2735

2362

del _interface

2736

2363

2737

mandos_dbus_service = MandosDBusService()

2364

class MandosDBusServiceTransitional(MandosDBusService):

2365

__metaclass__ = AlternateDBusNamesMetaclass

2366

mandos_dbus_service = MandosDBusServiceTransitional()

2738

2367

2739

2368

def cleanup():

2740

2369

"Cleanup function; run on exit"

2741

2370

service.cleanup()

2742

2371

2743

2372

multiprocessing.active_children()

2744

wnull.close()

2745

2373

if not (tcp_server.clients or client_settings):

2746

2374

return

2747

2375

2759

2387

# A list of attributes that can not be pickled

2760

2388

# + secret.

2761

2389

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

2762

"checker", "server_settings"))

2390

"checker"))

2763

2391

for name, typ in (inspect.getmembers

2764

2392

(dbus.service.Object)):

2765

2393

exclude.add(name)

2774

2402

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

2775

2403

2776

2404

try:

2777

with (tempfile.NamedTemporaryFile

2778

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

2779

dir=os.path.dirname(stored_state_path),

2780

delete=False)) as stored_state:

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:

2781

2410

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

2782

tempname=stored_state.name

2783

2411

os.rename(tempname, stored_state_path)

2784

2412

except (IOError, OSError) as e:

2413

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

2414

.format(e))

2785

2415

if not debug:

2786

2416

try:

2787

2417

os.remove(tempname)

2788

2418

except NameError:

2789

2419

pass

2790

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

2791

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

2792

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

2793

else:

2794

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

2795

exc_info=e)

2796

raise

2420

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

2421

errno.EEXIST)):

2422

raise e

2797

2423

2798

2424

# Delete all clients, and settings from config

2799

2425

while tcp_server.clients:

2826

2452

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

2827

2453

if use_ipv6:

2828

2454

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

2829

" flowinfo %d, scope_id %d",

2830

*tcp_server.socket.getsockname())

2455

" flowinfo %d, scope_id %d"

2456

% tcp_server.socket.getsockname())

2831

2457

else: # IPv4

2832

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

2833

*tcp_server.socket.getsockname())

2458

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

2459

% tcp_server.socket.getsockname())

2834

2460

2835

2461

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

2836

2462

2839

2465

try:

2840

2466

service.activate()

2841

2467

except dbus.exceptions.DBusException as error:

2842

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

2468

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

2843

2469

cleanup()

2844

2470

sys.exit(1)

2845

2471

# End of Avahi example code

2852

2478

logger.debug("Starting main loop")

2853

2479

main_loop.run()

2854

2480

except AvahiError as error:

2855

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

2481

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

2856

2482

cleanup()

2857

2483

sys.exit(1)

2858

2484

except KeyboardInterrupt: