/mandos/trunk : revision 619

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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 = "1.4.1"

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version = "1.6.0"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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class PGPEngine(object):

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"""A simple class for OpenPGP symmetric encryption & decryption"""

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet'])

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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def __exit__ (self, exc_type, exc_value, traceback):

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def __exit__(self, exc_type, exc_value, traceback):

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self._cleanup()

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return False

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

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def encrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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class AvahiError(Exception):

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

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self.value = value

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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type: string; Example: '_mandos._tcp'.

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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raise AvahiGroupError("State changed: {0!s}"

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.format(error))

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def cleanup(self):

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

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if self.group is not None:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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return ((td.days * 24 * 60 * 60 * 1000)

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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"""A representation of a client host served by this server.

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, or None.

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checker, -2 means no checker completed yet.

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

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name: string; from the config file, used in log messages and

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D-Bus identifiers

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secret: bytestring; sent verbatim (over TLS) to client

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timeout: datetime.timedelta(); How long from last_checked_ok

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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

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

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"last_approval_request", "last_checked_ok",

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

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

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"extended_timeout": "15m",

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"interval": "2m",

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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

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with exceptions for any special settings as defined above"""

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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

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"enabled")

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

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.replace(" ", ""))

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"rb") as secfile:

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

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else:

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

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% section)

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = None

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if client["enabled"]:

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client["last_enabled"] = datetime.datetime.utcnow()

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client["expires"] = (datetime.datetime.utcnow()

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+ client["timeout"])

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else:

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client["last_enabled"] = None

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client["expires"] = None

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client["last_checker_status"] = -2

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return settings

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

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"""Note: the 'checker' key in 'config' sets the

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'checker_command' attribute and *not* the 'checker'

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attribute."""

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

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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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self.created = settings.get("created", datetime.datetime.utcnow())

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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:

571

self.send_changedstate()

572

if not quiet:

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

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

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

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gobject.source_remove(self.disable_initiator_tag)

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598

self.disable_initiator_tag = None

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self.expires = None

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

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

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gobject.source_remove(self.checker_initiator_tag)

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602

self.checker_initiator_tag = None

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603

self.stop_checker()

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604

self.enabled = False

605

if not quiet:

606

self.send_changedstate()

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607

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

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return False

585

609

589

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def init_checker(self):

590

614

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

591

615

# and every interval from then on.

616

if self.checker_initiator_tag is not None:

617

gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = (gobject.timeout_add

593

619

(self.interval_milliseconds(),

594

620

self.start_checker))

595

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

622

if self.disable_initiator_tag is not None:

623

gobject.source_remove(self.disable_initiator_tag)

596

624

self.disable_initiator_tag = (gobject.timeout_add

597

625

(self.timeout_milliseconds(),

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626

self.disable))

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645

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

618

646

vars(self))

619

647

620

def checked_ok(self, timeout=None):

621

"""Bump up the timeout for this client.

622

623

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

624

alive and well.

625

"""

648

def checked_ok(self):

649

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

650

self.last_checked_ok = datetime.datetime.utcnow()

651

self.last_checker_status = 0

652

self.bump_timeout()

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654

def bump_timeout(self, timeout=None):

655

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

626

656

if timeout is None:

627

657

timeout = self.timeout

628

self.last_checked_ok = datetime.datetime.utcnow()

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658

if self.disable_initiator_tag is not None:

630

659

gobject.source_remove(self.disable_initiator_tag)

660

self.disable_initiator_tag = None

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661

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

632

662

self.disable_initiator_tag = (gobject.timeout_add

633

663

(timedelta_to_milliseconds

643

673

If a checker already exists, leave it running and do

644

674

nothing."""

645

675

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

646

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

647

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

648

# client would inevitably timeout, since no checker would get

649

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

676

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

677

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

678

# would inevitably timeout, since no checker would get a

679

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

650

680

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

651

681

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

652

682

# should be.

666

696

self.current_checker_command)

667

697

# Start a new checker if needed

668

698

if self.checker is None:

699

# Escape attributes for the shell

700

escaped_attrs = dict(

701

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

702

for attr in

703

self.runtime_expansions)

669

704

try:

670

# In case checker_command has exactly one % operator

671

command = self.checker_command % self.host

672

except TypeError:

673

# Escape attributes for the shell

674

escaped_attrs = dict(

675

(attr,

676

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

677

errors=

678

'replace')))

679

for attr in

680

self.runtime_expansions)

681

682

try:

683

command = self.checker_command % escaped_attrs

684

except TypeError as error:

685

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

686

' %s', self.checker_command, error)

687

return True # Try again later

705

command = self.checker_command % escaped_attrs

706

except TypeError as error:

707

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

708

self.checker_command, exc_info=error)

709

return True # Try again later

688

710

self.current_checker_command = command

689

711

try:

690

712

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

693

715

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

694

716

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

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717

# always replaced by /dev/null.)

718

# The exception is when not debugging but nevertheless

719

# running in the foreground; use the previously

720

# created wnull.

721

popen_args = {}

722

if (not self.server_settings["debug"]

723

and self.server_settings["foreground"]):

724

popen_args.update({"stdout": wnull,

725

"stderr": wnull })

696

726

self.checker = subprocess.Popen(command,

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727

close_fds=True,

698

shell=True, cwd="/")

699

self.checker_callback_tag = (gobject.child_watch_add

700

(self.checker.pid,

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self.checker_callback,

702

data=command))

703

# The checker may have completed before the gobject

704

# watch was added. Check for this.

728

shell=True, cwd="/",

729

**popen_args)

730

except OSError as error:

731

logger.error("Failed to start subprocess",

732

exc_info=error)

733

return True

734

self.checker_callback_tag = (gobject.child_watch_add

735

(self.checker.pid,

736

self.checker_callback,

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data=command))

738

# The checker may have completed before the gobject

739

# watch was added. Check for this.

740

try:

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741

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

706

if pid:

707

gobject.source_remove(self.checker_callback_tag)

708

self.checker_callback(pid, status, command)

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742

except OSError as error:

710

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

711

error)

743

if error.errno == errno.ECHILD:

744

# This should never happen

745

logger.error("Child process vanished",

746

exc_info=error)

747

return True

748

raise

749

if pid:

750

gobject.source_remove(self.checker_callback_tag)

751

self.checker_callback(pid, status, command)

712

752

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

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753

return True

714

754

721

761

return

722

762

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

723

763

try:

724

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

764

self.checker.terminate()

725

765

#time.sleep(0.5)

726

766

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

727

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

767

# self.checker.kill()

728

768

except OSError as error:

729

769

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

730

770

raise

747

787

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

748

788

if byte_arrays and signature != "ay":

749

789

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

750

" signature %r" % signature)

790

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

751

791

def decorator(func):

752

792

func._dbus_is_property = True

753

793

func._dbus_interface = dbus_interface

761

801

return decorator

762

802

763

803

804

def dbus_interface_annotations(dbus_interface):

805

"""Decorator for marking functions returning interface annotations

806

807

Usage:

808

809

@dbus_interface_annotations("org.example.Interface")

810

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

811

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

812

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

813

"false"}

814

"""

815

def decorator(func):

816

func._dbus_is_interface = True

817

func._dbus_interface = dbus_interface

818

func._dbus_name = dbus_interface

819

return func

820

return decorator

821

822

823

def dbus_annotations(annotations):

824

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

825

Usage:

826

827

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

828

access="r")

829

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

830

"org.freedesktop.DBus.Property."

831

"EmitsChangedSignal": "false"})

832

def Property_dbus_property(self):

833

return dbus.Boolean(False)

834

"""

835

def decorator(func):

836

func._dbus_annotations = annotations

837

return func

838

return decorator

839

840

764

841

class DBusPropertyException(dbus.exceptions.DBusException):

765

842

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

766

843

"""

789

866

"""

790

867

791

868

@staticmethod

792

def _is_dbus_property(obj):

793

return getattr(obj, "_dbus_is_property", False)

869

def _is_dbus_thing(thing):

870

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

871

872

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

873

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

874

"""

875

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

876

False)

794

877

795

def _get_all_dbus_properties(self):

878

def _get_all_dbus_things(self, thing):

796

879

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

797

880

"""

798

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

881

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

882

name),

883

athing.__get__(self))

799

884

for cls in self.__class__.__mro__

800

for name, prop in

801

inspect.getmembers(cls, self._is_dbus_property))

885

for name, athing in

886

inspect.getmembers(cls,

887

self._is_dbus_thing(thing)))

802

888

803

889

def _get_dbus_property(self, interface_name, property_name):

804

890

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

806

892

"""

807

893

for cls in self.__class__.__mro__:

808

894

for name, value in (inspect.getmembers

809

(cls, self._is_dbus_property)):

895

(cls,

896

self._is_dbus_thing("property"))):

810

897

if (value._dbus_name == property_name

811

898

and value._dbus_interface == interface_name):

812

899

return value.__get__(self)

841

928

# signatures other than "ay".

842

929

if prop._dbus_signature != "ay":

843

930

raise ValueError

844

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

845

for byte in value))

931

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

932

for byte in value))

846

933

prop(value)

847

934

848

935

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

854

941

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

855

942

"""

856

943

properties = {}

857

for name, prop in self._get_all_dbus_properties():

944

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

858

945

if (interface_name

859

946

and interface_name != prop._dbus_interface):

860

947

# Interface non-empty but did not match

875

962

path_keyword='object_path',

876

963

connection_keyword='connection')

877

964

def Introspect(self, object_path, connection):

878

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

965

"""Overloading of standard D-Bus method.

966

967

Inserts property tags and interface annotation tags.

879

968

"""

880

969

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

881

970

connection)

888

977

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

889

978

return e

890

979

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

980

# Add property tags

891

981

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

892

982

for name, prop

893

in self._get_all_dbus_properties()

983

in self._get_all_dbus_things("property")

894

984

if prop._dbus_interface

895

985

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

896

986

if_tag.appendChild(tag)

987

# Add annotation tags

988

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

989

for tag in if_tag.getElementsByTagName(typ):

990

annots = dict()

991

for name, prop in (self.

992

_get_all_dbus_things(typ)):

993

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

994

and prop._dbus_interface

995

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

996

annots.update(getattr

997

(prop,

998

"_dbus_annotations",

999

{}))

1000

for name, value in annots.iteritems():

1001

ann_tag = document.createElement(

1002

"annotation")

1003

ann_tag.setAttribute("name", name)

1004

ann_tag.setAttribute("value", value)

1005

tag.appendChild(ann_tag)

1006

# Add interface annotation tags

1007

for annotation, value in dict(

1008

itertools.chain.from_iterable(

1009

annotations().iteritems()

1010

for name, annotations in

1011

self._get_all_dbus_things("interface")

1012

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

1013

)).iteritems():

1014

ann_tag = document.createElement("annotation")

1015

ann_tag.setAttribute("name", annotation)

1016

ann_tag.setAttribute("value", value)

1017

if_tag.appendChild(ann_tag)

897

1018

# Add the names to the return values for the

898

1019

# "org.freedesktop.DBus.Properties" methods

899

1020

if (if_tag.getAttribute("name")

914

1035

except (AttributeError, xml.dom.DOMException,

915

1036

xml.parsers.expat.ExpatError) as error:

916

1037

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

917

error)

1038

exc_info=error)

918

1039

return xmlstring

919

1040

920

1041

921

def datetime_to_dbus (dt, variant_level=0):

1042

def datetime_to_dbus(dt, variant_level=0):

922

1043

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

923

1044

if dt is None:

924

1045

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

926

1047

variant_level=variant_level)

927

1048

928

1049

929

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

930

.__metaclass__):

931

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

932

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

1050

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1051

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

1052

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

1053

interface names according to the "alt_interface_names" mapping.

1054

Usage:

1055

1056

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

1057

"net.example.AlternateInterface"})

1058

class SampleDBusObject(dbus.service.Object):

1059

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

1060

def SampleDBusMethod():

1061

pass

1062

1063

The above "SampleDBusMethod" on "SampleDBusObject" will be

1064

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

1065

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

1066

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

1067

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

1068

1069

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

1070

(from DBusObjectWithProperties) and interfaces (from the

1071

dbus_interface_annotations decorator).

933

1072

"""

934

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

935

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

936

# methods, signals, or properties in them

937

for base in (b for b in bases

938

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

939

# Go though all attributes of the base class

940

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

1073

def wrapper(cls):

1074

for orig_interface_name, alt_interface_name in (

1075

alt_interface_names.iteritems()):

1076

attr = {}

1077

interface_names = set()

1078

# Go though all attributes of the class

1079

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

941

1080

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

942

1081

# with the wrong interface name

943

1082

if (not hasattr(attribute, "_dbus_interface")

944

1083

or not attribute._dbus_interface

945

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

1084

.startswith(orig_interface_name)):

946

1085

continue

947

1086

# Create an alternate D-Bus interface name based on

948

1087

# the current name

949

1088

alt_interface = (attribute._dbus_interface

950

.replace("se.recompile.Mandos",

951

"se.bsnet.fukt.Mandos"))

1089

.replace(orig_interface_name,

1090

alt_interface_name))

1091

interface_names.add(alt_interface)

952

1092

# Is this a D-Bus signal?

953

1093

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

954

# Extract the original non-method function by

955

# black magic

1094

# Extract the original non-method undecorated

1095

# function by black magic

956

1096

nonmethod_func = (dict(

957

1097

zip(attribute.func_code.co_freevars,

958

1098

attribute.__closure__))["func"]

969

1109

nonmethod_func.func_name,

970

1110

nonmethod_func.func_defaults,

971

1111

nonmethod_func.func_closure)))

1112

# Copy annotations, if any

1113

try:

1114

new_function._dbus_annotations = (

1115

dict(attribute._dbus_annotations))

1116

except AttributeError:

1117

pass

972

1118

# Define a creator of a function to call both the

973

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

974

# signals gets sent when the function is called

1119

# original and alternate functions, so both the

1120

# original and alternate signals gets sent when

1121

# the function is called

975

1122

def fixscope(func1, func2):

976

1123

"""This function is a scope container to pass

977

1124

func1 and func2 to the "call_both" function

984

1131

return call_both

985

1132

# Create the "call_both" function and add it to

986

1133

# the class

987

attr[attrname] = fixscope(attribute,

988

new_function)

1134

attr[attrname] = fixscope(attribute, new_function)

989

1135

# Is this a D-Bus method?

990

1136

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

991

1137

# Create a new, but exactly alike, function

1002

1148

attribute.func_name,

1003

1149

attribute.func_defaults,

1004

1150

attribute.func_closure)))

1151

# Copy annotations, if any

1152

try:

1153

attr[attrname]._dbus_annotations = (

1154

dict(attribute._dbus_annotations))

1155

except AttributeError:

1156

pass

1005

1157

# Is this a D-Bus property?

1006

1158

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

1007

1159

# Create a new, but exactly alike, function

1021

1173

attribute.func_name,

1022

1174

attribute.func_defaults,

1023

1175

attribute.func_closure)))

1024

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

1025

1026

1176

# Copy annotations, if any

1177

try:

1178

attr[attrname]._dbus_annotations = (

1179

dict(attribute._dbus_annotations))

1180

except AttributeError:

1181

pass

1182

# Is this a D-Bus interface?

1183

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

1184

# Create a new, but exactly alike, function

1185

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

1186

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

1187

# to the class.

1188

attr[attrname] = (dbus_interface_annotations

1189

(alt_interface)

1190

(types.FunctionType

1191

(attribute.func_code,

1192

attribute.func_globals,

1193

attribute.func_name,

1194

attribute.func_defaults,

1195

attribute.func_closure)))

1196

if deprecate:

1197

# Deprecate all alternate interfaces

1198

iname="_AlternateDBusNames_interface_annotation{0}"

1199

for interface_name in interface_names:

1200

@dbus_interface_annotations(interface_name)

1201

def func(self):

1202

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

1203

"true" }

1204

# Find an unused name

1205

for aname in (iname.format(i)

1206

for i in itertools.count()):

1207

if aname not in attr:

1208

attr[aname] = func

1209

break

1210

if interface_names:

1211

# Replace the class with a new subclass of it with

1212

# methods, signals, etc. as created above.

1213

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

1214

(cls,), attr)

1215

return cls

1216

return wrapper

1217

1218

1219

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

1220

"se.bsnet.fukt.Mandos"})

1027

1221

class ClientDBus(Client, DBusObjectWithProperties):

1028

1222

"""A Client class using D-Bus

1029

1223

1040

1234

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

1041

1235

self.bus = bus

1042

1236

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

1043

self._approvals_pending = 0

1044

1045

self._approvals_pending = 0

1046

1237

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

1047

1238

# the D-Bus

1048

1239

client_object_name = unicode(self.name).translate(

1052

1243

("/clients/" + client_object_name))

1053

1244

DBusObjectWithProperties.__init__(self, self.bus,

1054

1245

self.dbus_object_path)

1055

1246

1056

1247

def notifychangeproperty(transform_func,

1057

1248

dbus_name, type_func=lambda x: x,

1058

1249

variant_level=1):

1081

1272

1082

1273

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

1083

1274

1084

1085

1275

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1086

1276

approvals_pending = notifychangeproperty(dbus.Boolean,

1087

1277

"ApprovalPending",

1094

1284

checker is not None)

1095

1285

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1096

1286

"LastCheckedOK")

1287

last_checker_status = notifychangeproperty(dbus.Int16,

1288

"LastCheckerStatus")

1097

1289

last_approval_request = notifychangeproperty(

1098

1290

datetime_to_dbus, "LastApprovalRequest")

1099

1291

approved_by_default = notifychangeproperty(dbus.Boolean,

1167

1359

return False

1168

1360

1169

1361

def approve(self, value=True):

1170

self.send_changedstate()

1171

1362

self.approved = value

1172

1363

gobject.timeout_add(timedelta_to_milliseconds

1173

1364

(self.approval_duration),

1174

1365

self._reset_approved)

1175

1366

self.send_changedstate()

1176

1367

1177

1368

## D-Bus methods, signals & properties

1178

1369

_interface = "se.recompile.Mandos.Client"

1179

1370

1371

## Interfaces

1372

1373

@dbus_interface_annotations(_interface)

1374

def _foo(self):

1375

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

1376

"false"}

1377

1180

1378

## Signals

1181

1379

1182

1380

# CheckerCompleted - signal

1218

1416

"D-Bus signal"

1219

1417

return self.need_approval()

1220

1418

1221

# NeRwequest - signal

1222

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

1223

def NewRequest(self, ip):

1224

"""D-Bus signal

1225

Is sent after a client request a password.

1226

"""

1227

pass

1228

1229

1419

## Methods

1230

1420

1231

1421

# Approve - method

1341

1531

return

1342

1532

return datetime_to_dbus(self.last_checked_ok)

1343

1533

1534

# LastCheckerStatus - property

1535

@dbus_service_property(_interface, signature="n",

1536

access="read")

1537

def LastCheckerStatus_dbus_property(self):

1538

return dbus.Int16(self.last_checker_status)

1539

1344

1540

# Expires - property

1345

1541

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

1346

1542

def Expires_dbus_property(self):

1357

1553

def Timeout_dbus_property(self, value=None):

1358

1554

if value is None: # get

1359

1555

return dbus.UInt64(self.timeout_milliseconds())

1556

old_timeout = self.timeout

1360

1557

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

1361

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

1362

return

1363

# Reschedule timeout

1364

gobject.source_remove(self.disable_initiator_tag)

1365

self.disable_initiator_tag = None

1366

self.expires = None

1367

time_to_die = timedelta_to_milliseconds((self

1368

.last_checked_ok

1369

+ self.timeout)

1370

- datetime.datetime

1371

.utcnow())

1372

if time_to_die <= 0:

1373

# The timeout has passed

1374

self.disable()

1375

else:

1376

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

1377

+ datetime.timedelta(milliseconds =

1378

time_to_die))

1379

self.disable_initiator_tag = (gobject.timeout_add

1380

(time_to_die, self.disable))

1558

# Reschedule disabling

1559

if self.enabled:

1560

now = datetime.datetime.utcnow()

1561

self.expires += self.timeout - old_timeout

1562

if self.expires <= now:

1563

# The timeout has passed

1564

self.disable()

1565

else:

1566

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

1567

is None):

1568

return

1569

gobject.source_remove(self.disable_initiator_tag)

1570

self.disable_initiator_tag = (

1571

gobject.timeout_add(

1572

timedelta_to_milliseconds(self.expires - now),

1573

self.disable))

1381

1574

1382

1575

# ExtendedTimeout - property

1383

1576

@dbus_service_property(_interface, signature="t",

1462

1655

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

1463

1656

1464

1657

1465

class ClientDBusTransitional(ClientDBus):

1466

__metaclass__ = AlternateDBusNamesMetaclass

1467

1468

1469

1658

class ClientHandler(socketserver.BaseRequestHandler, object):

1470

1659

"""A class to handle client connections.

1471

1660

1539

1728

except KeyError:

1540

1729

return

1541

1730

1542

if self.server.use_dbus:

1543

# Emit D-Bus signal

1544

client.NewRequest(str(self.client_address))

1545

1546

1731

if client.approval_delay:

1547

1732

delay = client.approval_delay

1548

1733

client.approvals_pending += 1

1579

1764

#wait until timeout or approved

1580

1765

time = datetime.datetime.now()

1581

1766

client.changedstate.acquire()

1582

(client.changedstate.wait

1583

(float(client.timedelta_to_milliseconds(delay)

1584

/ 1000)))

1767

client.changedstate.wait(

1768

float(timedelta_to_milliseconds(delay)

1769

/ 1000))

1585

1770

client.changedstate.release()

1586

1771

time2 = datetime.datetime.now()

1587

1772

if (time2 - time) >= delay:

1603

1788

try:

1604

1789

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

1605

1790

except gnutls.errors.GNUTLSError as error:

1606

logger.warning("gnutls send failed")

1791

logger.warning("gnutls send failed",

1792

exc_info=error)

1607

1793

return

1608

1794

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

1609

1795

sent, len(client.secret)

1612

1798

1613

1799

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

1614

1800

# bump the timeout using extended_timeout

1615

client.checked_ok(client.extended_timeout)

1801

client.bump_timeout(client.extended_timeout)

1616

1802

if self.server.use_dbus:

1617

1803

# Emit D-Bus signal

1618

1804

client.GotSecret()

1623

1809

try:

1624

1810

session.bye()

1625

1811

except gnutls.errors.GNUTLSError as error:

1626

logger.warning("GnuTLS bye failed")

1812

logger.warning("GnuTLS bye failed",

1813

exc_info=error)

1627

1814

1628

1815

@staticmethod

1629

1816

def peer_certificate(session):

1701

1888

def process_request(self, request, address):

1702

1889

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

1703

1890

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

1704

args = (request,

1705

address))

1891

args = (request, address))

1706

1892

proc.start()

1707

1893

return proc

1708

1894

1736

1922

use_ipv6: Boolean; to use IPv6 or not

1737

1923

"""

1738

1924

def __init__(self, server_address, RequestHandlerClass,

1739

interface=None, use_ipv6=True):

1925

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

1926

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

1927

creating a new one with socket.socket().

1928

"""

1740

1929

self.interface = interface

1741

1930

if use_ipv6:

1742

1931

self.address_family = socket.AF_INET6

1932

if socketfd is not None:

1933

# Save the file descriptor

1934

self.socketfd = socketfd

1935

# Save the original socket.socket() function

1936

self.socket_socket = socket.socket

1937

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

1938

#

1939

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

1940

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

1941

# patching socket.socket.)

1942

#

1943

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

1944

@functools.wraps(socket.socket)

1945

def socket_wrapper(*args, **kwargs):

1946

# Restore original function so subsequent calls are

1947

# not affected.

1948

socket.socket = self.socket_socket

1949

del self.socket_socket

1950

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

1951

# saved file descriptor.

1952

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

1953

# Replace socket.socket() function with wrapper

1954

socket.socket = socket_wrapper

1955

# The socketserver.TCPServer.__init__ will call

1956

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

1957

# socket_wrapper(), if socketfd was set.

1743

1958

socketserver.TCPServer.__init__(self, server_address,

1744

1959

RequestHandlerClass)

1960

1745

1961

def server_bind(self):

1746

1962

"""This overrides the normal server_bind() function

1747

1963

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

1755

1971

try:

1756

1972

self.socket.setsockopt(socket.SOL_SOCKET,

1757

1973

SO_BINDTODEVICE,

1758

str(self.interface

1759

+ '\0'))

1974

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

1760

1975

except socket.error as error:

1761

if error[0] == errno.EPERM:

1762

logger.error("No permission to"

1763

" bind to interface %s",

1764

self.interface)

1765

elif error[0] == errno.ENOPROTOOPT:

1976

if error.errno == errno.EPERM:

1977

logger.error("No permission to bind to"

1978

" interface %s", self.interface)

1979

elif error.errno == errno.ENOPROTOOPT:

1766

1980

logger.error("SO_BINDTODEVICE not available;"

1767

1981

" cannot bind to interface %s",

1768

1982

self.interface)

1983

elif error.errno == errno.ENODEV:

1984

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

1985

" cannot bind", self.interface)

1769

1986

else:

1770

1987

raise

1771

1988

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

1774

1991

if self.address_family == socket.AF_INET6:

1775

1992

any_address = "::" # in6addr_any

1776

1993

else:

1777

any_address = socket.INADDR_ANY

1994

any_address = "0.0.0.0" # INADDR_ANY

1778

1995

self.server_address = (any_address,

1779

1996

self.server_address[1])

1780

1997

elif not self.server_address[1]:

1801

2018

"""

1802

2019

def __init__(self, server_address, RequestHandlerClass,

1803

2020

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

1804

gnutls_priority=None, use_dbus=True):

2021

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

1805

2022

self.enabled = False

1806

2023

self.clients = clients

1807

2024

if self.clients is None:

1811

2028

IPv6_TCPServer.__init__(self, server_address,

1812

2029

RequestHandlerClass,

1813

2030

interface = interface,

1814

use_ipv6 = use_ipv6)

2031

use_ipv6 = use_ipv6,

2032

socketfd = socketfd)

1815

2033

def server_activate(self):

1816

2034

if self.enabled:

1817

2035

return socketserver.TCPServer.server_activate(self)

1830

2048

1831

2049

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

1832

2050

proc = None, client_object=None):

1833

condition_names = {

1834

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

1835

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

1836

# blocking).

1837

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

1838

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

1839

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

1840

# broken, usually for pipes and

1841

# sockets).

1842

}

1843

conditions_string = ' | '.join(name

1844

for cond, name in

1845

condition_names.iteritems()

1846

if cond & condition)

1847

2051

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

1848

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

2052

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

1849

2053

# Wait for other process to exit

1850

2054

proc.join()

1851

2055

return False

1909

2113

return True

1910

2114

1911

2115

2116

def rfc3339_duration_to_delta(duration):

2117

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

2118

2119

>>> rfc3339_duration_to_delta("P7D")

2120

datetime.timedelta(7)

2121

>>> rfc3339_duration_to_delta("PT60S")

2122

datetime.timedelta(0, 60)

2123

>>> rfc3339_duration_to_delta("PT60M")

2124

datetime.timedelta(0, 3600)

2125

>>> rfc3339_duration_to_delta("PT24H")

2126

datetime.timedelta(1)

2127

>>> rfc3339_duration_to_delta("P1W")

2128

datetime.timedelta(7)

2129

>>> rfc3339_duration_to_delta("PT5M30S")

2130

datetime.timedelta(0, 330)

2131

>>> rfc3339_duration_to_delta("P1DT3M20S")

2132

datetime.timedelta(1, 200)

2133

"""

2134

2135

# Parsing an RFC 3339 duration with regular expressions is not

2136

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

2137

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

2138

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

2139

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

2140

# avoid excessive use of external libraries.

2141

2142

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

2143

Token = collections.namedtuple("Token",

2144

("regexp", # To match token; if

2145

# "value" is not None,

2146

# must have a "group"

2147

# containing digits

2148

"value", # datetime.timedelta or

2149

# None

2150

"followers")) # Tokens valid after

2151

# this token

2152

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

2153

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

2154

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

2155

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

2156

datetime.timedelta(seconds=1),

2157

frozenset((token_end,)))

2158

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

2159

datetime.timedelta(minutes=1),

2160

frozenset((token_second, token_end)))

2161

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

2162

datetime.timedelta(hours=1),

2163

frozenset((token_minute, token_end)))

2164

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

2165

None,

2166

frozenset((token_hour, token_minute,

2167

token_second)))

2168

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

2169

datetime.timedelta(days=1),

2170

frozenset((token_time, token_end)))

2171

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

2172

datetime.timedelta(weeks=4),

2173

frozenset((token_day, token_end)))

2174

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

2175

datetime.timedelta(weeks=52),

2176

frozenset((token_month, token_end)))

2177

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

2178

datetime.timedelta(weeks=1),

2179

frozenset((token_end,)))

2180

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

2181

frozenset((token_year, token_month,

2182

token_day, token_time,

2183

token_week))),

2184

# Define starting values

2185

value = datetime.timedelta() # Value so far

2186

found_token = None

2187

followers = frozenset(token_duration,) # Following valid tokens

2188

s = duration # String left to parse

2189

# Loop until end token is found

2190

while found_token is not token_end:

2191

# Search for any currently valid tokens

2192

for token in followers:

2193

match = token.regexp.match(s)

2194

if match is not None:

2195

# Token found

2196

if token.value is not None:

2197

# Value found, parse digits

2198

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

2199

# Add to value so far

2200

value += factor * token.value

2201

# Strip token from string

2202

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

2203

# Go to found token

2204

found_token = token

2205

# Set valid next tokens

2206

followers = found_token.followers

2207

break

2208

else:

2209

# No currently valid tokens were found

2210

raise ValueError("Invalid RFC 3339 duration")

2211

# End token found

2212

return value

2213

2214

1912

2215

def string_to_delta(interval):

1913

2216

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

1914

2217

1925

2228

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

1926

2229

datetime.timedelta(0, 330)

1927

2230

"""

2231

2232

try:

2233

return rfc3339_duration_to_delta(interval)

2234

except ValueError:

2235

pass

2236

1928

2237

timevalue = datetime.timedelta(0)

1929

2238

for s in interval.split():

1930

2239

try:

1941

2250

elif suffix == "w":

1942

2251

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

1943

2252

else:

1944

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

2253

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

2254

.format(suffix))

1945

2255

except (ValueError, IndexError) as e:

1946

2256

raise ValueError(*(e.args))

1947

2257

timevalue += delta

1961

2271

sys.exit()

1962

2272

if not noclose:

1963

2273

# Close all standard open file descriptors

1964

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

2274

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

1965

2275

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

1966

2276

raise OSError(errno.ENODEV,

1967

"%s not a character device"

1968

% os.path.devnull)

2277

"{0} not a character device"

2278

.format(os.devnull))

1969

2279

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

1970

2280

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

1971

2281

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

1980

2290

1981

2291

parser = argparse.ArgumentParser()

1982

2292

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

1983

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

2293

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

1984

2294

help="show version number and exit")

1985

2295

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

1986

2296

help="Bind to interface IF")

1992

2302

help="Run self-test")

1993

2303

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

1994

2304

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

1995

" to terminal")

2305

" to terminal", default=None)

1996

2306

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

1997

2307

help="Debug level for stdout output")

1998

2308

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

2005

2315

" files")

2006

2316

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

2007

2317

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

2008

" system bus interface")

2318

" system bus interface", default=None)

2009

2319

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

2010

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

2320

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

2321

default=None)

2011

2322

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

2012

2323

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

2013

" state")

2324

" state", default=None)

2325

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

2326

help="Specify a file descriptor to a network"

2327

" socket to use instead of creating one")

2014

2328

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

2015

2329

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

2330

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

2331

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

2016

2332

2017

2333

options = parser.parse_args()

2018

2334

2027

2343

"port": "",

2028

2344

"debug": "False",

2029

2345

"priority":

2030

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

2346

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

2031

2347

"servicename": "Mandos",

2032

2348

"use_dbus": "True",

2033

2349

"use_ipv6": "True",

2034

2350

"debuglevel": "",

2035

2351

"restore": "True",

2036

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

2352

"socket": "",

2353

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

2354

"foreground": "False",

2037

2355

}

2038

2356

2039

2357

# Parse config file for server-global settings

2044

2362

# Convert the SafeConfigParser object to a dict

2045

2363

server_settings = server_config.defaults()

2046

2364

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

2047

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

2365

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

2048

2366

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

2049

2367

option)

2050

2368

if server_settings["port"]:

2051

2369

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

2052

2370

"port")

2371

if server_settings["socket"]:

2372

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

2373

"socket")

2374

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

2375

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

2376

# happen with a supplied network socket.

2377

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

2378

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

2379

["socket"])

2053

2380

del server_config

2054

2381

2055

2382

# Override the settings from the config file with command line

2057

2384

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

2058

2385

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

2059

2386

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

2060

"statedir"):

2387

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

2061

2388

value = getattr(options, option)

2062

2389

if value is not None:

2063

2390

server_settings[option] = value

2066

2393

for option in server_settings.keys():

2067

2394

if type(server_settings[option]) is str:

2068

2395

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

2396

# Force all boolean options to be boolean

2397

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

2398

"foreground"):

2399

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

2400

# Debug implies foreground

2401

if server_settings["debug"]:

2402

server_settings["foreground"] = True

2069

2403

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

2070

2404

2071

2405

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

2077

2411

use_ipv6 = server_settings["use_ipv6"]

2078

2412

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

2079

2413

stored_state_file)

2414

foreground = server_settings["foreground"]

2080

2415

2081

2416

if debug:

2082

2417

initlogger(debug, logging.DEBUG)

2089

2424

2090

2425

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

2091

2426

syslogger.setFormatter(logging.Formatter

2092

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

2093

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

2094

% server_settings["servicename"]))

2427

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

2428

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

2429

.format(server_settings

2430

["servicename"])))

2095

2431

2096

2432

# Parse config file with clients

2097

client_config = configparser.SafeConfigParser(Client.client_defaults)

2433

client_config = configparser.SafeConfigParser(Client

2434

.client_defaults)

2098

2435

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

2099

2436

"clients.conf"))

2100

2437

2109

2446

use_ipv6=use_ipv6,

2110

2447

gnutls_priority=

2111

2448

server_settings["priority"],

2112

use_dbus=use_dbus)

2113

if not debug:

2449

use_dbus=use_dbus,

2450

socketfd=(server_settings["socket"]

2451

or None))

2452

if not foreground:

2114

2453

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

2454

pidfile = None

2115

2455

try:

2116

2456

pidfile = open(pidfilename, "w")

2117

except IOError:

2118

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

2457

except IOError as e:

2458

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

2459

exc_info=e)

2119

2460

2120

try:

2121

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

2122

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

2123

except KeyError:

2461

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

2124

2462

try:

2125

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

2126

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

2463

uid = pwd.getpwnam(name).pw_uid

2464

gid = pwd.getpwnam(name).pw_gid

2465

break

2127

2466

except KeyError:

2128

try:

2129

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

2130

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

2131

except KeyError:

2132

uid = 65534

2133

gid = 65534

2467

continue

2468

else:

2469

uid = 65534

2470

gid = 65534

2134

2471

try:

2135

2472

os.setgid(gid)

2136

2473

os.setuid(uid)

2137

2474

except OSError as error:

2138

if error[0] != errno.EPERM:

2475

if error.errno != errno.EPERM:

2139

2476

raise error

2140

2477

2141

2478

if debug:

2153

2490

.gnutls_global_set_log_function(debug_gnutls))

2154

2491

2155

2492

# Redirect stdin so all checkers get /dev/null

2156

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

2493

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

2157

2494

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

2158

2495

if null > 2:

2159

2496

os.close(null)

2160

2497

2161

2498

# Need to fork before connecting to D-Bus

2162

if not debug:

2499

if not foreground:

2163

2500

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

2164

2501

daemon()

2165

2502

2503

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

2504

# need to inform gobject that threads will be used.

2166

2505

gobject.threads_init()

2167

2506

2168

2507

global main_loop

2169

2508

# From the Avahi example code

2170

DBusGMainLoop(set_as_default=True )

2509

DBusGMainLoop(set_as_default=True)

2171

2510

main_loop = gobject.MainLoop()

2172

2511

bus = dbus.SystemBus()

2173

2512

# End of Avahi example code

2179

2518

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

2180

2519

do_not_queue=True))

2181

2520

except dbus.exceptions.NameExistsException as e:

2182

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

2521

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

2183

2522

use_dbus = False

2184

2523

server_settings["use_dbus"] = False

2185

2524

tcp_server.use_dbus = False

2197

2536

2198

2537

client_class = Client

2199

2538

if use_dbus:

2200

client_class = functools.partial(ClientDBusTransitional,

2201

bus = bus)

2539

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

2202

2540

2203

2541

client_settings = Client.config_parser(client_config)

2204

2542

old_client_settings = {}

2205

2543

clients_data = {}

2206

2544

2545

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

2546

global wnull

2547

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

2548

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

2549

# mode

2550

if debug or not foreground:

2551

wnull.close()

2552

2207

2553

# Get client data and settings from last running state.

2208

2554

if server_settings["restore"]:

2209

2555

try:

2212

2558

(stored_state))

2213

2559

os.remove(stored_state_path)

2214

2560

except IOError as e:

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2561

if e.errno == errno.ENOENT:

2562

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

2563

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

2564

else:

2565

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

2566

exc_info=e)

2218

2567

raise

2219

2568

except EOFError as e:

2220

2569

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

2221

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

2570

"EOFError:", exc_info=e)

2222

2571

2223

2572

with PGPEngine() as pgp:

2224

2573

for client_name, client in clients_data.iteritems():

2574

# Skip removed clients

2575

if client_name not in client_settings:

2576

continue

2577

2225

2578

# Decide which value to use after restoring saved state.

2226

2579

# We have three different values: Old config file,

2227

2580

# new config file, and saved state.

2241

2594

2242

2595

# Clients who has passed its expire date can still be

2243

2596

# enabled if its last checker was successful. Clients

2244

# whose checker failed before we stored its state is

2245

# assumed to have failed all checkers during downtime.

2597

# whose checker succeeded before we stored its state is

2598

# assumed to have successfully run all checkers during

2599

# downtime.

2246

2600

if client["enabled"]:

2247

2601

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

2248

2602

if not client["last_checked_ok"]:

2249

2603

logger.warning(

2250

2604

"disabling client {0} - Client never "

2251

"performed a successfull checker"

2252

.format(client["name"]))

2605

"performed a successful checker"

2606

.format(client_name))

2253

2607

client["enabled"] = False

2254

2608

elif client["last_checker_status"] != 0:

2255

2609

logger.warning(

2256

2610

"disabling client {0} - Client "

2257

2611

"last checker failed with error code {1}"

2258

.format(client["name"],

2612

.format(client_name,

2259

2613

client["last_checker_status"]))

2260

2614

client["enabled"] = False

2261

2615

else:

2262

2616

client["expires"] = (datetime.datetime

2263

2617

.utcnow()

2264

2618

+ client["timeout"])

2265

2619

logger.debug("Last checker succeeded,"

2620

" keeping {0} enabled"

2621

.format(client_name))

2266

2622

try:

2267

2623

client["secret"] = (

2268

2624

pgp.decrypt(client["encrypted_secret"],

2274

2630

.format(client_name))

2275

2631

client["secret"] = (

2276

2632

client_settings[client_name]["secret"])

2277

2278

2633

2279

2634

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

2280

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

2635

for client_name in (set(old_client_settings)

2636

- set(client_settings)):

2281

2637

del clients_data[client_name]

2282

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

2638

for client_name in (set(client_settings)

2639

- set(old_client_settings)):

2283

2640

clients_data[client_name] = client_settings[client_name]

2284

2285

# Create clients all clients

2641

2642

# Create all client objects

2286

2643

for client_name, client in clients_data.iteritems():

2287

2644

tcp_server.clients[client_name] = client_class(

2288

name = client_name, settings = client)

2645

name = client_name, settings = client,

2646

server_settings = server_settings)

2289

2647

2290

2648

if not tcp_server.clients:

2291

2649

logger.warning("No clients defined")

2292

2293

if not debug:

2294

try:

2295

with pidfile:

2296

pid = os.getpid()

2297

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

2298

del pidfile

2299

except IOError:

2300

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

2301

pidfilename, pid)

2302

except NameError:

2303

# "pidfile" was never created

2304

pass

2650

2651

if not foreground:

2652

if pidfile is not None:

2653

try:

2654

with pidfile:

2655

pid = os.getpid()

2656

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

2657

except IOError:

2658

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

2659

pidfilename, pid)

2660

del pidfile

2305

2661

del pidfilename

2306

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

2307

2662

2308

2663

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

2309

2664

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

2310

2665

2311

2666

if use_dbus:

2312

class MandosDBusService(dbus.service.Object):

2667

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

2668

"se.bsnet.fukt.Mandos"})

2669

class MandosDBusService(DBusObjectWithProperties):

2313

2670

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

2314

2671

def __init__(self):

2315

2672

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

2316

2673

_interface = "se.recompile.Mandos"

2317

2674

2675

@dbus_interface_annotations(_interface)

2676

def _foo(self):

2677

return { "org.freedesktop.DBus.Property"

2678

".EmitsChangedSignal":

2679

"false"}

2680

2318

2681

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

2319

2682

def ClientAdded(self, objpath):

2320

2683

"D-Bus signal"

2362

2725

2363

2726

del _interface

2364

2727

2365

class MandosDBusServiceTransitional(MandosDBusService):

2366

__metaclass__ = AlternateDBusNamesMetaclass

2367

mandos_dbus_service = MandosDBusServiceTransitional()

2728

mandos_dbus_service = MandosDBusService()

2368

2729

2369

2730

def cleanup():

2370

2731

"Cleanup function; run on exit"

2371

2732

service.cleanup()

2372

2733

2373

2734

multiprocessing.active_children()

2735

wnull.close()

2374

2736

if not (tcp_server.clients or client_settings):

2375

2737

return

2376

2738

2388

2750

# A list of attributes that can not be pickled

2389

2751

# + secret.

2390

2752

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

2391

"checker"))

2753

"checker", "server_settings"))

2392

2754

for name, typ in (inspect.getmembers

2393

2755

(dbus.service.Object)):

2394

2756

exclude.add(name)

2403

2765

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

2404

2766

2405

2767

try:

2406

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

2407

prefix="clients-",

2408

dir=os.path.dirname

2409

(stored_state_path))

2410

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

2768

with (tempfile.NamedTemporaryFile

2769

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

2770

dir=os.path.dirname(stored_state_path),

2771

delete=False)) as stored_state:

2411

2772

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

2773

tempname=stored_state.name

2412

2774

os.rename(tempname, stored_state_path)

2413

2775

except (IOError, OSError) as e:

2414

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

2415

.format(e))

2416

2776

if not debug:

2417

2777

try:

2418

2778

os.remove(tempname)

2419

2779

except NameError:

2420

2780

pass

2421

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

2422

errno.EEXIST)):

2781

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

2782

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

2783

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

2784

else:

2785

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

2786

exc_info=e)

2423

2787

raise e

2424

2788

2425

2789

# Delete all clients, and settings from config

2453

2817

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

2454

2818

if use_ipv6:

2455

2819

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

2456

" flowinfo %d, scope_id %d"

2457

% tcp_server.socket.getsockname())

2820

" flowinfo %d, scope_id %d",

2821

*tcp_server.socket.getsockname())

2458

2822

else: # IPv4

2459

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

2460

% tcp_server.socket.getsockname())

2823

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

2824

*tcp_server.socket.getsockname())

2461

2825

2462

2826

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

2463

2827

2466

2830

try:

2467

2831

service.activate()

2468

2832

except dbus.exceptions.DBusException as error:

2469

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

2833

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

2470

2834

cleanup()

2471

2835

sys.exit(1)

2472

2836

# End of Avahi example code

2479

2843

logger.debug("Starting main loop")

2480

2844

main_loop.run()

2481

2845

except AvahiError as error:

2482

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

2846

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

2483

2847

cleanup()

2484

2848

sys.exit(1)

2485

2849

except KeyboardInterrupt: