/mandos/trunk : revision 539

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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 = "1.6.0"

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version = "1.4.1"

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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.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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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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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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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 secret has been sent

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extended_timeout: extra long timeout when password 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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"""

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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

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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,

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"enabled")

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

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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",

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datetime.datetime.utcnow())

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

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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

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# Already enabled

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return

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self.send_changedstate()

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

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

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if not quiet:

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self.send_changedstate()

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", 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:

578

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

597

579

gobject.source_remove(self.checker_initiator_tag)

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580

self.checker_initiator_tag = None

599

581

self.stop_checker()

600

582

self.enabled = False

601

if not quiet:

602

self.send_changedstate()

603

583

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

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return False

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585

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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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# and every interval from then on.

612

if self.checker_initiator_tag is not None:

613

gobject.source_remove(self.checker_initiator_tag)

614

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self.checker_initiator_tag = (gobject.timeout_add

615

593

(self.interval_milliseconds(),

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self.start_checker))

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

618

if self.disable_initiator_tag is not None:

619

gobject.source_remove(self.disable_initiator_tag)

620

596

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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def checked_ok(self):

645

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

646

self.last_checked_ok = datetime.datetime.utcnow()

647

self.last_checker_status = 0

648

self.bump_timeout()

649

650

def bump_timeout(self, timeout=None):

651

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

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

"""

652

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if timeout is None:

653

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timeout = self.timeout

628

self.last_checked_ok = datetime.datetime.utcnow()

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629

if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

656

self.disable_initiator_tag = None

657

631

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

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self.disable_initiator_tag = (gobject.timeout_add

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(timedelta_to_milliseconds

669

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If a checker already exists, leave it running and do

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nothing."""

671

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

672

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

673

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

674

# would inevitably timeout, since no checker would get a

675

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

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

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

677

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

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# should be.

692

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self.current_checker_command)

693

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# Start a new checker if needed

694

668

if self.checker is None:

695

# Escape attributes for the shell

696

escaped_attrs = dict(

697

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

698

for attr in

699

self.runtime_expansions)

700

669

try:

701

command = self.checker_command % escaped_attrs

702

except TypeError as error:

703

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

704

self.checker_command, exc_info=error)

705

return True # Try again later

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

706

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self.current_checker_command = command

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689

try:

708

690

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

714

696

self.checker = subprocess.Popen(command,

715

697

close_fds=True,

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shell=True, cwd="/")

717

except OSError as error:

718

logger.error("Failed to start subprocess",

719

exc_info=error)

720

return True

721

self.checker_callback_tag = (gobject.child_watch_add

722

(self.checker.pid,

723

self.checker_callback,

724

data=command))

725

# The checker may have completed before the gobject

726

# watch was added. Check for this.

727

try:

699

self.checker_callback_tag = (gobject.child_watch_add

700

(self.checker.pid,

701

self.checker_callback,

702

data=command))

703

# The checker may have completed before the gobject

704

# watch was added. Check for this.

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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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709

except OSError as error:

730

if error.errno == errno.ECHILD:

731

# This should never happen

732

logger.error("Child process vanished",

733

exc_info=error)

734

return True

735

raise

736

if pid:

737

gobject.source_remove(self.checker_callback_tag)

738

self.checker_callback(pid, status, command)

710

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

711

error)

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

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713

return True

741

714

748

721

return

749

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

750

723

try:

751

self.checker.terminate()

724

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

752

725

#time.sleep(0.5)

753

726

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

754

# self.checker.kill()

727

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

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728

except OSError as error:

756

729

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

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730

raise

774

747

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

775

748

if byte_arrays and signature != "ay":

776

749

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

777

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

750

" signature %r" % signature)

778

751

def decorator(func):

779

752

func._dbus_is_property = True

780

753

func._dbus_interface = dbus_interface

788

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return decorator

789

762

790

763

791

def dbus_interface_annotations(dbus_interface):

792

"""Decorator for marking functions returning interface annotations

793

794

Usage:

795

796

@dbus_interface_annotations("org.example.Interface")

797

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

798

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

799

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

800

"false"}

801

"""

802

def decorator(func):

803

func._dbus_is_interface = True

804

func._dbus_interface = dbus_interface

805

func._dbus_name = dbus_interface

806

return func

807

return decorator

808

809

810

def dbus_annotations(annotations):

811

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

812

Usage:

813

814

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

815

access="r")

816

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

817

"org.freedesktop.DBus.Property."

818

"EmitsChangedSignal": "false"})

819

def Property_dbus_property(self):

820

return dbus.Boolean(False)

821

"""

822

def decorator(func):

823

func._dbus_annotations = annotations

824

return func

825

return decorator

826

827

828

764

class DBusPropertyException(dbus.exceptions.DBusException):

829

765

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

830

766

"""

853

789

"""

854

790

855

791

@staticmethod

856

def _is_dbus_thing(thing):

857

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

858

859

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

860

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

861

"""

862

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

863

False)

792

def _is_dbus_property(obj):

793

return getattr(obj, "_dbus_is_property", False)

864

794

865

def _get_all_dbus_things(self, thing):

795

def _get_all_dbus_properties(self):

866

796

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

867

797

"""

868

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

869

name),

870

athing.__get__(self))

798

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

871

799

for cls in self.__class__.__mro__

872

for name, athing in

873

inspect.getmembers(cls,

874

self._is_dbus_thing(thing)))

800

for name, prop in

801

inspect.getmembers(cls, self._is_dbus_property))

875

802

876

803

def _get_dbus_property(self, interface_name, property_name):

877

804

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

879

806

"""

880

807

for cls in self.__class__.__mro__:

881

808

for name, value in (inspect.getmembers

882

(cls,

883

self._is_dbus_thing("property"))):

809

(cls, self._is_dbus_property)):

884

810

if (value._dbus_name == property_name

885

811

and value._dbus_interface == interface_name):

886

812

return value.__get__(self)

915

841

# signatures other than "ay".

916

842

if prop._dbus_signature != "ay":

917

843

raise ValueError

918

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

919

for byte in value))

844

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

845

for byte in value))

920

846

prop(value)

921

847

922

848

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

928

854

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

929

855

"""

930

856

properties = {}

931

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

857

for name, prop in self._get_all_dbus_properties():

932

858

if (interface_name

933

859

and interface_name != prop._dbus_interface):

934

860

# Interface non-empty but did not match

949

875

path_keyword='object_path',

950

876

connection_keyword='connection')

951

877

def Introspect(self, object_path, connection):

952

"""Overloading of standard D-Bus method.

953

954

Inserts property tags and interface annotation tags.

878

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

955

879

"""

956

880

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

957

881

connection)

964

888

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

965

889

return e

966

890

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

967

# Add property tags

968

891

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

969

892

for name, prop

970

in self._get_all_dbus_things("property")

893

in self._get_all_dbus_properties()

971

894

if prop._dbus_interface

972

895

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

973

896

if_tag.appendChild(tag)

974

# Add annotation tags

975

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

976

for tag in if_tag.getElementsByTagName(typ):

977

annots = dict()

978

for name, prop in (self.

979

_get_all_dbus_things(typ)):

980

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

981

and prop._dbus_interface

982

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

983

annots.update(getattr

984

(prop,

985

"_dbus_annotations",

986

{}))

987

for name, value in annots.iteritems():

988

ann_tag = document.createElement(

989

"annotation")

990

ann_tag.setAttribute("name", name)

991

ann_tag.setAttribute("value", value)

992

tag.appendChild(ann_tag)

993

# Add interface annotation tags

994

for annotation, value in dict(

995

itertools.chain.from_iterable(

996

annotations().iteritems()

997

for name, annotations in

998

self._get_all_dbus_things("interface")

999

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

1000

)).iteritems():

1001

ann_tag = document.createElement("annotation")

1002

ann_tag.setAttribute("name", annotation)

1003

ann_tag.setAttribute("value", value)

1004

if_tag.appendChild(ann_tag)

1005

897

# Add the names to the return values for the

1006

898

# "org.freedesktop.DBus.Properties" methods

1007

899

if (if_tag.getAttribute("name")

1022

914

except (AttributeError, xml.dom.DOMException,

1023

915

xml.parsers.expat.ExpatError) as error:

1024

916

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

1025

exc_info=error)

917

error)

1026

918

return xmlstring

1027

919

1028

920

1029

def datetime_to_dbus(dt, variant_level=0):

921

def datetime_to_dbus (dt, variant_level=0):

1030

922

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

1031

923

if dt is None:

1032

924

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

1034

926

variant_level=variant_level)

1035

927

1036

928

1037

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1038

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

1039

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

1040

interface names according to the "alt_interface_names" mapping.

1041

Usage:

1042

1043

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

1044

"net.example.AlternateInterface"})

1045

class SampleDBusObject(dbus.service.Object):

1046

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

1047

def SampleDBusMethod():

1048

pass

1049

1050

The above "SampleDBusMethod" on "SampleDBusObject" will be

1051

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

1052

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

1053

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

1054

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

1055

1056

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

1057

(from DBusObjectWithProperties) and interfaces (from the

1058

dbus_interface_annotations decorator).

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.

1059

933

"""

1060

def wrapper(cls):

1061

for orig_interface_name, alt_interface_name in (

1062

alt_interface_names.iteritems()):

1063

attr = {}

1064

interface_names = set()

1065

# Go though all attributes of the class

1066

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

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):

1067

941

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

1068

942

# with the wrong interface name

1069

943

if (not hasattr(attribute, "_dbus_interface")

1070

944

or not attribute._dbus_interface

1071

.startswith(orig_interface_name)):

945

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

1072

946

continue

1073

947

# Create an alternate D-Bus interface name based on

1074

948

# the current name

1075

949

alt_interface = (attribute._dbus_interface

1076

.replace(orig_interface_name,

1077

alt_interface_name))

1078

interface_names.add(alt_interface)

950

.replace("se.recompile.Mandos",

951

"se.bsnet.fukt.Mandos"))

1079

952

# Is this a D-Bus signal?

1080

953

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

1081

# Extract the original non-method undecorated

1082

# function by black magic

954

# Extract the original non-method function by

955

# black magic

1083

956

nonmethod_func = (dict(

1084

957

zip(attribute.func_code.co_freevars,

1085

958

attribute.__closure__))["func"]

1096

969

nonmethod_func.func_name,

1097

970

nonmethod_func.func_defaults,

1098

971

nonmethod_func.func_closure)))

1099

# Copy annotations, if any

1100

try:

1101

new_function._dbus_annotations = (

1102

dict(attribute._dbus_annotations))

1103

except AttributeError:

1104

pass

1105

972

# Define a creator of a function to call both the

1106

# original and alternate functions, so both the

1107

# original and alternate signals gets sent when

1108

# the function is called

973

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

974

# signals gets sent when the function is called

1109

975

def fixscope(func1, func2):

1110

976

"""This function is a scope container to pass

1111

977

func1 and func2 to the "call_both" function

1118

984

return call_both

1119

985

# Create the "call_both" function and add it to

1120

986

# the class

1121

attr[attrname] = fixscope(attribute, new_function)

987

attr[attrname] = fixscope(attribute,

988

new_function)

1122

989

# Is this a D-Bus method?

1123

990

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

1124

991

# Create a new, but exactly alike, function

1135

1002

attribute.func_name,

1136

1003

attribute.func_defaults,

1137

1004

attribute.func_closure)))

1138

# Copy annotations, if any

1139

try:

1140

attr[attrname]._dbus_annotations = (

1141

dict(attribute._dbus_annotations))

1142

except AttributeError:

1143

pass

1144

1005

# Is this a D-Bus property?

1145

1006

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

1146

1007

# Create a new, but exactly alike, function

1160

1021

attribute.func_name,

1161

1022

attribute.func_defaults,

1162

1023

attribute.func_closure)))

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1169

# Is this a D-Bus interface?

1170

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

1171

# Create a new, but exactly alike, function

1172

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

1173

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

1174

# to the class.

1175

attr[attrname] = (dbus_interface_annotations

1176

(alt_interface)

1177

(types.FunctionType

1178

(attribute.func_code,

1179

attribute.func_globals,

1180

attribute.func_name,

1181

attribute.func_defaults,

1182

attribute.func_closure)))

1183

if deprecate:

1184

# Deprecate all alternate interfaces

1185

iname="_AlternateDBusNames_interface_annotation{0}"

1186

for interface_name in interface_names:

1187

@dbus_interface_annotations(interface_name)

1188

def func(self):

1189

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

1190

"true" }

1191

# Find an unused name

1192

for aname in (iname.format(i)

1193

for i in itertools.count()):

1194

if aname not in attr:

1195

attr[aname] = func

1196

break

1197

if interface_names:

1198

# Replace the class with a new subclass of it with

1199

# methods, signals, etc. as created above.

1200

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

1201

(cls,), attr)

1202

return cls

1203

return wrapper

1204

1205

1206

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

1207

"se.bsnet.fukt.Mandos"})

1024

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

1025

1026

1208

1027

class ClientDBus(Client, DBusObjectWithProperties):

1209

1028

"""A Client class using D-Bus

1210

1029

1221

1040

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

1222

1041

self.bus = bus

1223

1042

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

1043

self._approvals_pending = 0

1044

1045

self._approvals_pending = 0

1224

1046

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

1225

1047

# the D-Bus

1226

1048

client_object_name = unicode(self.name).translate(

1230

1052

("/clients/" + client_object_name))

1231

1053

DBusObjectWithProperties.__init__(self, self.bus,

1232

1054

self.dbus_object_path)

1233

1055

1234

1056

def notifychangeproperty(transform_func,

1235

1057

dbus_name, type_func=lambda x: x,

1236

1058

variant_level=1):

1259

1081

1260

1082

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

1261

1083

1084

1262

1085

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1263

1086

approvals_pending = notifychangeproperty(dbus.Boolean,

1264

1087

"ApprovalPending",

1271

1094

checker is not None)

1272

1095

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1273

1096

"LastCheckedOK")

1274

last_checker_status = notifychangeproperty(dbus.Int16,

1275

"LastCheckerStatus")

1276

1097

last_approval_request = notifychangeproperty(

1277

1098

datetime_to_dbus, "LastApprovalRequest")

1278

1099

approved_by_default = notifychangeproperty(dbus.Boolean,

1346

1167

return False

1347

1168

1348

1169

def approve(self, value=True):

1170

self.send_changedstate()

1349

1171

self.approved = value

1350

1172

gobject.timeout_add(timedelta_to_milliseconds

1351

1173

(self.approval_duration),

1352

1174

self._reset_approved)

1353

self.send_changedstate()

1175

1354

1176

1355

1177

## D-Bus methods, signals & properties

1356

1178

_interface = "se.recompile.Mandos.Client"

1357

1179

1358

## Interfaces

1359

1360

@dbus_interface_annotations(_interface)

1361

def _foo(self):

1362

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

1363

"false"}

1364

1365

1180

## Signals

1366

1181

1367

1182

# CheckerCompleted - signal

1403

1218

"D-Bus signal"

1404

1219

return self.need_approval()

1405

1220

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

1406

1229

## Methods

1407

1230

1408

1231

# Approve - method

1518

1341

return

1519

1342

return datetime_to_dbus(self.last_checked_ok)

1520

1343

1521

# LastCheckerStatus - property

1522

@dbus_service_property(_interface, signature="n",

1523

access="read")

1524

def LastCheckerStatus_dbus_property(self):

1525

return dbus.Int16(self.last_checker_status)

1526

1527

1344

# Expires - property

1528

1345

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

1529

1346

def Expires_dbus_property(self):

1540

1357

def Timeout_dbus_property(self, value=None):

1541

1358

if value is None: # get

1542

1359

return dbus.UInt64(self.timeout_milliseconds())

1543

old_timeout = self.timeout

1544

1360

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

1545

# Reschedule disabling

1546

if self.enabled:

1547

now = datetime.datetime.utcnow()

1548

self.expires += self.timeout - old_timeout

1549

if self.expires <= now:

1550

# The timeout has passed

1551

self.disable()

1552

else:

1553

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

1554

is None):

1555

return

1556

gobject.source_remove(self.disable_initiator_tag)

1557

self.disable_initiator_tag = (

1558

gobject.timeout_add(

1559

timedelta_to_milliseconds(self.expires - now),

1560

self.disable))

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))

1561

1381

1562

1382

# ExtendedTimeout - property

1563

1383

@dbus_service_property(_interface, signature="t",

1642

1462

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

1643

1463

1644

1464

1465

class ClientDBusTransitional(ClientDBus):

1466

__metaclass__ = AlternateDBusNamesMetaclass

1467

1468

1645

1469

class ClientHandler(socketserver.BaseRequestHandler, object):

1646

1470

"""A class to handle client connections.

1647

1471

1715

1539

except KeyError:

1716

1540

return

1717

1541

1542

if self.server.use_dbus:

1543

# Emit D-Bus signal

1544

client.NewRequest(str(self.client_address))

1545

1718

1546

if client.approval_delay:

1719

1547

delay = client.approval_delay

1720

1548

client.approvals_pending += 1

1751

1579

#wait until timeout or approved

1752

1580

time = datetime.datetime.now()

1753

1581

client.changedstate.acquire()

1754

client.changedstate.wait(

1755

float(timedelta_to_milliseconds(delay)

1756

/ 1000))

1582

(client.changedstate.wait

1583

(float(client.timedelta_to_milliseconds(delay)

1584

/ 1000)))

1757

1585

client.changedstate.release()

1758

1586

time2 = datetime.datetime.now()

1759

1587

if (time2 - time) >= delay:

1775

1603

try:

1776

1604

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

1777

1605

except gnutls.errors.GNUTLSError as error:

1778

logger.warning("gnutls send failed",

1779

exc_info=error)

1606

logger.warning("gnutls send failed")

1780

1607

return

1781

1608

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

1782

1609

sent, len(client.secret)

1785

1612

1786

1613

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

1787

1614

# bump the timeout using extended_timeout

1788

client.bump_timeout(client.extended_timeout)

1615

client.checked_ok(client.extended_timeout)

1789

1616

if self.server.use_dbus:

1790

1617

# Emit D-Bus signal

1791

1618

client.GotSecret()

1796

1623

try:

1797

1624

session.bye()

1798

1625

except gnutls.errors.GNUTLSError as error:

1799

logger.warning("GnuTLS bye failed",

1800

exc_info=error)

1626

logger.warning("GnuTLS bye failed")

1801

1627

1802

1628

@staticmethod

1803

1629

def peer_certificate(session):

1875

1701

def process_request(self, request, address):

1876

1702

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

1877

1703

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

1878

args = (request, address))

1704

args = (request,

1705

address))

1879

1706

proc.start()

1880

1707

return proc

1881

1708

1909

1736

use_ipv6: Boolean; to use IPv6 or not

1910

1737

"""

1911

1738

def __init__(self, server_address, RequestHandlerClass,

1912

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

1913

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

1914

creating a new one with socket.socket().

1915

"""

1739

interface=None, use_ipv6=True):

1916

1740

self.interface = interface

1917

1741

if use_ipv6:

1918

1742

self.address_family = socket.AF_INET6

1919

if socketfd is not None:

1920

# Save the file descriptor

1921

self.socketfd = socketfd

1922

# Save the original socket.socket() function

1923

self.socket_socket = socket.socket

1924

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

1925

#

1926

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

1927

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

1928

# patching socket.socket.)

1929

#

1930

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

1931

@functools.wraps(socket.socket)

1932

def socket_wrapper(*args, **kwargs):

1933

# Restore original function so subsequent calls are

1934

# not affected.

1935

socket.socket = self.socket_socket

1936

del self.socket_socket

1937

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

1938

# saved file descriptor.

1939

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

1940

# Replace socket.socket() function with wrapper

1941

socket.socket = socket_wrapper

1942

# The socketserver.TCPServer.__init__ will call

1943

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

1944

# socket_wrapper(), if socketfd was set.

1945

1743

socketserver.TCPServer.__init__(self, server_address,

1946

1744

RequestHandlerClass)

1947

1948

1745

def server_bind(self):

1949

1746

"""This overrides the normal server_bind() function

1950

1747

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

1958

1755

try:

1959

1756

self.socket.setsockopt(socket.SOL_SOCKET,

1960

1757

SO_BINDTODEVICE,

1961

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

1758

str(self.interface

1759

+ '\0'))

1962

1760

except socket.error as error:

1963

if error.errno == errno.EPERM:

1964

logger.error("No permission to bind to"

1965

" interface %s", self.interface)

1966

elif error.errno == errno.ENOPROTOOPT:

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:

1967

1766

logger.error("SO_BINDTODEVICE not available;"

1968

1767

" cannot bind to interface %s",

1969

1768

self.interface)

1970

elif error.errno == errno.ENODEV:

1971

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

1972

" cannot bind", self.interface)

1973

1769

else:

1974

1770

raise

1975

1771

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

2005

1801

"""

2006

1802

def __init__(self, server_address, RequestHandlerClass,

2007

1803

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

2008

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

1804

gnutls_priority=None, use_dbus=True):

2009

1805

self.enabled = False

2010

1806

self.clients = clients

2011

1807

if self.clients is None:

2015

1811

IPv6_TCPServer.__init__(self, server_address,

2016

1812

RequestHandlerClass,

2017

1813

interface = interface,

2018

use_ipv6 = use_ipv6,

2019

socketfd = socketfd)

1814

use_ipv6 = use_ipv6)

2020

1815

def server_activate(self):

2021

1816

if self.enabled:

2022

1817

return socketserver.TCPServer.server_activate(self)

2035

1830

2036

1831

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

2037

1832

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)

2038

1847

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

2039

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

1848

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

2040

1849

# Wait for other process to exit

2041

1850

proc.join()

2042

1851

return False

2100

1909

return True

2101

1910

2102

1911

2103

def rfc3339_duration_to_delta(duration):

2104

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

2105

2106

>>> rfc3339_duration_to_delta("P7D")

2107

datetime.timedelta(7)

2108

>>> rfc3339_duration_to_delta("PT60S")

2109

datetime.timedelta(0, 60)

2110

>>> rfc3339_duration_to_delta("PT60M")

2111

datetime.timedelta(0, 3600)

2112

>>> rfc3339_duration_to_delta("PT24H")

2113

datetime.timedelta(1)

2114

>>> rfc3339_duration_to_delta("P1W")

2115

datetime.timedelta(7)

2116

>>> rfc3339_duration_to_delta("PT5M30S")

2117

datetime.timedelta(0, 330)

2118

>>> rfc3339_duration_to_delta("P1DT3M20S")

2119

datetime.timedelta(1, 200)

2120

"""

2121

2122

# Parsing an RFC 3339 duration with regular expressions is not

2123

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

2124

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

2125

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

2126

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

2127

# avoid excessive use of external libraries.

2128

2129

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

2130

Token = collections.namedtuple("Token",

2131

("regexp", # To match token; if

2132

# "value" is not None,

2133

# must have a "group"

2134

# containing digits

2135

"value", # datetime.timedelta or

2136

# None

2137

"followers")) # Tokens valid after

2138

# this token

2139

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

2140

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

2141

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

2142

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

2143

datetime.timedelta(seconds=1),

2144

frozenset((token_end,)))

2145

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

2146

datetime.timedelta(minutes=1),

2147

frozenset((token_second, token_end)))

2148

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

2149

datetime.timedelta(hours=1),

2150

frozenset((token_minute, token_end)))

2151

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

2152

None,

2153

frozenset((token_hour, token_minute,

2154

token_second)))

2155

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

2156

datetime.timedelta(days=1),

2157

frozenset((token_time, token_end)))

2158

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

2159

datetime.timedelta(weeks=4),

2160

frozenset((token_day, token_end)))

2161

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

2162

datetime.timedelta(weeks=52),

2163

frozenset((token_month, token_end)))

2164

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

2165

datetime.timedelta(weeks=1),

2166

frozenset((token_end,)))

2167

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

2168

frozenset((token_year, token_month,

2169

token_day, token_time,

2170

token_week))),

2171

# Define starting values

2172

value = datetime.timedelta() # Value so far

2173

found_token = None

2174

followers = frozenset(token_duration,) # Following valid tokens

2175

s = duration # String left to parse

2176

# Loop until end token is found

2177

while found_token is not token_end:

2178

# Search for any currently valid tokens

2179

for token in followers:

2180

match = token.regexp.match(s)

2181

if match is not None:

2182

# Token found

2183

if token.value is not None:

2184

# Value found, parse digits

2185

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

2186

# Add to value so far

2187

value += factor * token.value

2188

# Strip token from string

2189

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

2190

# Go to found token

2191

found_token = token

2192

# Set valid next tokens

2193

followers = found_token.followers

2194

break

2195

else:

2196

# No currently valid tokens were found

2197

raise ValueError("Invalid RFC 3339 duration")

2198

# End token found

2199

return value

2200

2201

2202

1912

def string_to_delta(interval):

2203

1913

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

2204

1914

2215

1925

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

2216

1926

datetime.timedelta(0, 330)

2217

1927

"""

2218

2219

try:

2220

return rfc3339_duration_to_delta(interval)

2221

except ValueError:

2222

pass

2223

2224

1928

timevalue = datetime.timedelta(0)

2225

1929

for s in interval.split():

2226

1930

try:

2237

1941

elif suffix == "w":

2238

1942

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

2239

1943

else:

2240

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

2241

.format(suffix))

1944

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

2242

1945

except (ValueError, IndexError) as e:

2243

1946

raise ValueError(*(e.args))

2244

1947

timevalue += delta

2258

1961

sys.exit()

2259

1962

if not noclose:

2260

1963

# Close all standard open file descriptors

2261

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

1964

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

2262

1965

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

2263

1966

raise OSError(errno.ENODEV,

2264

"{0} not a character device"

2265

.format(os.devnull))

1967

"%s not a character device"

1968

% os.path.devnull)

2266

1969

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

2267

1970

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

2268

1971

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

2277

1980

2278

1981

parser = argparse.ArgumentParser()

2279

1982

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

2280

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

1983

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

2281

1984

help="show version number and exit")

2282

1985

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

2283

1986

help="Bind to interface IF")

2308

2011

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

2309

2012

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

2310

2013

" state")

2311

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

2312

help="Specify a file descriptor to a network"

2313

" socket to use instead of creating one")

2314

2014

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

2315

2015

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

2316

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

2317

help="Run in foreground")

2318

2016

2319

2017

options = parser.parse_args()

2320

2018

2335

2033

"use_ipv6": "True",

2336

2034

"debuglevel": "",

2337

2035

"restore": "True",

2338

"socket": "",

2339

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

2340

"foreground": "False",

2036

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

2341

2037

}

2342

2038

2343

2039

# Parse config file for server-global settings

2348

2044

# Convert the SafeConfigParser object to a dict

2349

2045

server_settings = server_config.defaults()

2350

2046

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

2351

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

2047

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

2352

2048

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

2353

2049

option)

2354

2050

if server_settings["port"]:

2355

2051

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

2356

2052

"port")

2357

if server_settings["socket"]:

2358

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

2359

"socket")

2360

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

2361

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

2362

# happen with a supplied network socket.

2363

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

2364

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

2365

["socket"])

2366

2053

del server_config

2367

2054

2368

2055

# Override the settings from the config file with command line

2370

2057

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

2371

2058

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

2372

2059

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

2373

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

2060

"statedir"):

2374

2061

value = getattr(options, option)

2375

2062

if value is not None:

2376

2063

server_settings[option] = value

2379

2066

for option in server_settings.keys():

2380

2067

if type(server_settings[option]) is str:

2381

2068

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

2382

# Debug implies foreground

2383

if server_settings["debug"]:

2384

server_settings["foreground"] = True

2385

2069

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

2386

2070

2387

2071

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

2393

2077

use_ipv6 = server_settings["use_ipv6"]

2394

2078

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

2395

2079

stored_state_file)

2396

foreground = server_settings["foreground"]

2397

2080

2398

2081

if debug:

2399

2082

initlogger(debug, logging.DEBUG)

2406

2089

2407

2090

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

2408

2091

syslogger.setFormatter(logging.Formatter

2409

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

2410

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

2411

.format(server_settings

2412

["servicename"])))

2092

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

2093

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

2094

% server_settings["servicename"]))

2413

2095

2414

2096

# Parse config file with clients

2415

client_config = configparser.SafeConfigParser(Client

2416

.client_defaults)

2097

client_config = configparser.SafeConfigParser(Client.client_defaults)

2417

2098

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

2418

2099

"clients.conf"))

2419

2100

2428

2109

use_ipv6=use_ipv6,

2429

2110

gnutls_priority=

2430

2111

server_settings["priority"],

2431

use_dbus=use_dbus,

2432

socketfd=(server_settings["socket"]

2433

or None))

2434

if not foreground:

2112

use_dbus=use_dbus)

2113

if not debug:

2435

2114

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

2436

pidfile = None

2437

2115

try:

2438

2116

pidfile = open(pidfilename, "w")

2439

except IOError as e:

2440

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

2441

exc_info=e)

2117

except IOError:

2118

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

2442

2119

2443

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

2120

try:

2121

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

2122

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

2123

except KeyError:

2444

2124

try:

2445

uid = pwd.getpwnam(name).pw_uid

2446

gid = pwd.getpwnam(name).pw_gid

2447

break

2125

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

2126

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

2448

2127

except KeyError:

2449

continue

2450

else:

2451

uid = 65534

2452

gid = 65534

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

2453

2134

try:

2454

2135

os.setgid(gid)

2455

2136

os.setuid(uid)

2456

2137

except OSError as error:

2457

if error.errno != errno.EPERM:

2138

if error[0] != errno.EPERM:

2458

2139

raise error

2459

2140

2460

2141

if debug:

2472

2153

.gnutls_global_set_log_function(debug_gnutls))

2473

2154

2474

2155

# Redirect stdin so all checkers get /dev/null

2475

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

2156

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

2476

2157

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

2477

2158

if null > 2:

2478

2159

os.close(null)

2479

2160

2480

2161

# Need to fork before connecting to D-Bus

2481

if not foreground:

2162

if not debug:

2482

2163

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

2483

2164

daemon()

2484

2165

2485

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

2486

# need to inform gobject that threads will be used.

2487

2166

gobject.threads_init()

2488

2167

2489

2168

global main_loop

2490

2169

# From the Avahi example code

2491

DBusGMainLoop(set_as_default=True)

2170

DBusGMainLoop(set_as_default=True )

2492

2171

main_loop = gobject.MainLoop()

2493

2172

bus = dbus.SystemBus()

2494

2173

# End of Avahi example code

2500

2179

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

2501

2180

do_not_queue=True))

2502

2181

except dbus.exceptions.NameExistsException as e:

2503

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

2182

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

2504

2183

use_dbus = False

2505

2184

server_settings["use_dbus"] = False

2506

2185

tcp_server.use_dbus = False

2518

2197

2519

2198

client_class = Client

2520

2199

if use_dbus:

2521

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

2200

client_class = functools.partial(ClientDBusTransitional,

2201

bus = bus)

2522

2202

2523

2203

client_settings = Client.config_parser(client_config)

2524

2204

old_client_settings = {}

2532

2212

(stored_state))

2533

2213

os.remove(stored_state_path)

2534

2214

except IOError as e:

2535

if e.errno == errno.ENOENT:

2536

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

2537

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

2538

else:

2539

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

2540

exc_info=e)

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2541

2218

raise

2542

2219

except EOFError as e:

2543

2220

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

2544

"EOFError:", exc_info=e)

2221

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

2545

2222

2546

2223

with PGPEngine() as pgp:

2547

2224

for client_name, client in clients_data.iteritems():

2564

2241

2565

2242

# Clients who has passed its expire date can still be

2566

2243

# enabled if its last checker was successful. Clients

2567

# whose checker succeeded before we stored its state is

2568

# assumed to have successfully run all checkers during

2569

# downtime.

2244

# whose checker failed before we stored its state is

2245

# assumed to have failed all checkers during downtime.

2570

2246

if client["enabled"]:

2571

2247

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

2572

2248

if not client["last_checked_ok"]:

2573

2249

logger.warning(

2574

2250

"disabling client {0} - Client never "

2575

"performed a successful checker"

2576

.format(client_name))

2251

"performed a successfull checker"

2252

.format(client["name"]))

2577

2253

client["enabled"] = False

2578

2254

elif client["last_checker_status"] != 0:

2579

2255

logger.warning(

2580

2256

"disabling client {0} - Client "

2581

2257

"last checker failed with error code {1}"

2582

.format(client_name,

2258

.format(client["name"],

2583

2259

client["last_checker_status"]))

2584

2260

client["enabled"] = False

2585

2261

else:

2586

2262

client["expires"] = (datetime.datetime

2587

2263

.utcnow()

2588

2264

+ client["timeout"])

2589

logger.debug("Last checker succeeded,"

2590

" keeping {0} enabled"

2591

.format(client_name))

2265

2592

2266

try:

2593

2267

client["secret"] = (

2594

2268

pgp.decrypt(client["encrypted_secret"],

2600

2274

.format(client_name))

2601

2275

client["secret"] = (

2602

2276

client_settings[client_name]["secret"])

2277

2603

2278

2604

2279

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

2605

for client_name in (set(old_client_settings)

2606

- set(client_settings)):

2280

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

2607

2281

del clients_data[client_name]

2608

for client_name in (set(client_settings)

2609

- set(old_client_settings)):

2282

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

2610

2283

clients_data[client_name] = client_settings[client_name]

2611

2612

# Create all client objects

2284

2285

# Create clients all clients

2613

2286

for client_name, client in clients_data.iteritems():

2614

2287

tcp_server.clients[client_name] = client_class(

2615

2288

name = client_name, settings = client)

2616

2289

2617

2290

if not tcp_server.clients:

2618

2291

logger.warning("No clients defined")

2619

2620

if not foreground:

2621

if pidfile is not None:

2622

try:

2623

with pidfile:

2624

pid = os.getpid()

2625

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

2626

except IOError:

2627

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

2628

pidfilename, pid)

2629

del pidfile

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

2630

2305

del pidfilename

2306

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

2631

2307

2632

2308

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

2633

2309

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

2634

2310

2635

2311

if use_dbus:

2636

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

2637

"se.bsnet.fukt.Mandos"})

2638

class MandosDBusService(DBusObjectWithProperties):

2312

class MandosDBusService(dbus.service.Object):

2639

2313

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

2640

2314

def __init__(self):

2641

2315

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

2642

2316

_interface = "se.recompile.Mandos"

2643

2317

2644

@dbus_interface_annotations(_interface)

2645

def _foo(self):

2646

return { "org.freedesktop.DBus.Property"

2647

".EmitsChangedSignal":

2648

"false"}

2649

2650

2318

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

2651

2319

def ClientAdded(self, objpath):

2652

2320

"D-Bus signal"

2694

2362

2695

2363

del _interface

2696

2364

2697

mandos_dbus_service = MandosDBusService()

2365

class MandosDBusServiceTransitional(MandosDBusService):

2366

__metaclass__ = AlternateDBusNamesMetaclass

2367

mandos_dbus_service = MandosDBusServiceTransitional()

2698

2368

2699

2369

def cleanup():

2700

2370

"Cleanup function; run on exit"

2733

2403

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

2734

2404

2735

2405

try:

2736

with (tempfile.NamedTemporaryFile

2737

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

2738

dir=os.path.dirname(stored_state_path),

2739

delete=False)) as stored_state:

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:

2740

2411

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

2741

tempname=stored_state.name

2742

2412

os.rename(tempname, stored_state_path)

2743

2413

except (IOError, OSError) as e:

2414

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

2415

.format(e))

2744

2416

if not debug:

2745

2417

try:

2746

2418

os.remove(tempname)

2747

2419

except NameError:

2748

2420

pass

2749

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

2750

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

2751

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

2752

else:

2753

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

2754

exc_info=e)

2421

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

2422

errno.EEXIST)):

2755

2423

raise e

2756

2424

2757

2425

# Delete all clients, and settings from config

2785

2453

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

2786

2454

if use_ipv6:

2787

2455

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

2788

" flowinfo %d, scope_id %d",

2789

*tcp_server.socket.getsockname())

2456

" flowinfo %d, scope_id %d"

2457

% tcp_server.socket.getsockname())

2790

2458

else: # IPv4

2791

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

2792

*tcp_server.socket.getsockname())

2459

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

2460

% tcp_server.socket.getsockname())

2793

2461

2794

2462

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

2795

2463

2798

2466

try:

2799

2467

service.activate()

2800

2468

except dbus.exceptions.DBusException as error:

2801

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

2469

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

2802

2470

cleanup()

2803

2471

sys.exit(1)

2804

2472

# End of Avahi example code

2811

2479

logger.debug("Starting main loop")

2812

2480

main_loop.run()

2813

2481

except AvahiError as error:

2814

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

2482

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

2815

2483

cleanup()

2816

2484

sys.exit(1)

2817

2485

except KeyboardInterrupt: