/mandos/trunk : revision 717

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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 = "1.6.6"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger = None

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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def initlogger(debug, level=logging.WARNING):

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler

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(facility =

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logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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class PGPEngine(object):

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

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet'])

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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

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self._cleanup()

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return False

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def password_encode(self, password):

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# Passphrase can not be empty and can not contain newlines or

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# NUL bytes. So we prefix it and hex encode it.

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

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encoded = b"mandos" + binascii.hexlify(password)

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if len(encoded) > 2048:

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# GnuPG can't handle long passwords, so encode differently

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encoded = (b"mandos" + password.replace(b"\\", b"\\\\")

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.replace(b"\n", b"\\n")

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.replace(b"\0", b"\\x00"))

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return encoded

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def encrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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class AvahiError(Exception):

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

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self.value = value

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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

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.format(error))

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def cleanup(self):

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

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if self.group is not None:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, or None.

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checker, -2 means no checker completed yet.

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

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

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D-Bus identifiers

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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:

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self.send_changedstate()

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if not quiet:

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

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

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

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gobject.source_remove(self.disable_initiator_tag)

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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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self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

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if not quiet:

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self.send_changedstate()

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

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return False

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def init_checker(self):

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623

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

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# and every interval from then on.

625

if self.checker_initiator_tag is not None:

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = (gobject.timeout_add

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(self.interval_milliseconds(),

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self.start_checker))

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

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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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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655

vars(self))

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def checked_ok(self, timeout=None):

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"""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

"""

657

def checked_ok(self):

658

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

659

self.last_checked_ok = datetime.datetime.utcnow()

660

self.last_checker_status = 0

661

self.bump_timeout()

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def bump_timeout(self, timeout=None):

664

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

626

665

if timeout is None:

627

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timeout = self.timeout

628

self.last_checked_ok = datetime.datetime.utcnow()

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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670

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

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671

self.disable_initiator_tag = (gobject.timeout_add

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672

(timedelta_to_milliseconds

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682

If a checker already exists, leave it running and do

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683

nothing."""

645

684

# 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

685

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

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

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# would inevitably timeout, since no checker would get a

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

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

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

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# should be.

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

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694

try:

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695

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

657

except (AttributeError, OSError) as error:

658

if (isinstance(error, OSError)

659

and error.errno != errno.ECHILD):

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raise error

696

except AttributeError:

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pass

698

except OSError as error:

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if error.errno != errno.ECHILD:

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raise

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else:

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702

if pid:

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logger.warning("Checker was a zombie")

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self.current_checker_command)

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# Start a new checker if needed

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if self.checker is None:

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# Escape attributes for the shell

710

escaped_attrs = dict(

711

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

712

for attr in

713

self.runtime_expansions)

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try:

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# In case checker_command has exactly one % operator

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command = self.checker_command % self.host

672

except TypeError:

673

# Escape attributes for the shell

674

escaped_attrs = dict(

675

(attr,

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

677

errors=

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'replace')))

679

for attr in

680

self.runtime_expansions)

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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

715

command = self.checker_command % escaped_attrs

716

except TypeError as error:

717

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

718

self.checker_command, exc_info=error)

719

return True # Try again later

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self.current_checker_command = command

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721

try:

690

722

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

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725

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

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726

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

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# always replaced by /dev/null.)

728

# The exception is when not debugging but nevertheless

729

# running in the foreground; use the previously

730

# created wnull.

731

popen_args = {}

732

if (not self.server_settings["debug"]

733

and self.server_settings["foreground"]):

734

popen_args.update({"stdout": wnull,

735

"stderr": wnull })

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self.checker = subprocess.Popen(command,

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close_fds=True,

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shell=True, cwd="/")

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.

738

shell=True, cwd="/",

739

**popen_args)

740

except OSError as error:

741

logger.error("Failed to start subprocess",

742

exc_info=error)

743

return True

744

self.checker_callback_tag = (gobject.child_watch_add

745

(self.checker.pid,

746

self.checker_callback,

747

data=command))

748

# The checker may have completed before the gobject

749

# watch was added. Check for this.

750

try:

705

751

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)

709

752

except OSError as error:

710

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

711

error)

753

if error.errno == errno.ECHILD:

754

# This should never happen

755

logger.error("Child process vanished",

756

exc_info=error)

757

return True

758

raise

759

if pid:

760

gobject.source_remove(self.checker_callback_tag)

761

self.checker_callback(pid, status, command)

712

762

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

713

763

return True

714

764

721

771

return

722

772

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

723

773

try:

724

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

774

self.checker.terminate()

725

775

#time.sleep(0.5)

726

776

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

727

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

777

# self.checker.kill()

728

778

except OSError as error:

729

779

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

730

780

raise

747

797

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

748

798

if byte_arrays and signature != "ay":

749

799

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

750

" signature %r" % signature)

800

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

751

801

def decorator(func):

752

802

func._dbus_is_property = True

753

803

func._dbus_interface = dbus_interface

761

811

return decorator

762

812

763

813

814

def dbus_interface_annotations(dbus_interface):

815

"""Decorator for marking functions returning interface annotations

816

817

Usage:

818

819

@dbus_interface_annotations("org.example.Interface")

820

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

821

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

822

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

823

"false"}

824

"""

825

def decorator(func):

826

func._dbus_is_interface = True

827

func._dbus_interface = dbus_interface

828

func._dbus_name = dbus_interface

829

return func

830

return decorator

831

832

833

def dbus_annotations(annotations):

834

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

835

Usage:

836

837

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

838

access="r")

839

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

840

"org.freedesktop.DBus.Property."

841

"EmitsChangedSignal": "false"})

842

def Property_dbus_property(self):

843

return dbus.Boolean(False)

844

"""

845

def decorator(func):

846

func._dbus_annotations = annotations

847

return func

848

return decorator

849

850

764

851

class DBusPropertyException(dbus.exceptions.DBusException):

765

852

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

766

853

"""

789

876

"""

790

877

791

878

@staticmethod

792

def _is_dbus_property(obj):

793

return getattr(obj, "_dbus_is_property", False)

879

def _is_dbus_thing(thing):

880

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

881

882

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

883

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

884

"""

885

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

886

False)

794

887

795

def _get_all_dbus_properties(self):

888

def _get_all_dbus_things(self, thing):

796

889

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

797

890

"""

798

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

891

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

892

name),

893

athing.__get__(self))

799

894

for cls in self.__class__.__mro__

800

for name, prop in

801

inspect.getmembers(cls, self._is_dbus_property))

895

for name, athing in

896

inspect.getmembers(cls,

897

self._is_dbus_thing(thing)))

802

898

803

899

def _get_dbus_property(self, interface_name, property_name):

804

900

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

806

902

"""

807

903

for cls in self.__class__.__mro__:

808

904

for name, value in (inspect.getmembers

809

(cls, self._is_dbus_property)):

905

(cls,

906

self._is_dbus_thing("property"))):

810

907

if (value._dbus_name == property_name

811

908

and value._dbus_interface == interface_name):

812

909

return value.__get__(self)

840

937

# The byte_arrays option is not supported yet on

841

938

# signatures other than "ay".

842

939

if prop._dbus_signature != "ay":

843

raise ValueError

844

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

845

for byte in value))

940

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

941

"'ay' signature {0!r}"

942

.format(prop._dbus_signature))

943

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

944

for byte in value))

846

945

prop(value)

847

946

848

947

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

854

953

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

855

954

"""

856

955

properties = {}

857

for name, prop in self._get_all_dbus_properties():

956

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

858

957

if (interface_name

859

958

and interface_name != prop._dbus_interface):

860

959

# Interface non-empty but did not match

875

974

path_keyword='object_path',

876

975

connection_keyword='connection')

877

976

def Introspect(self, object_path, connection):

878

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

977

"""Overloading of standard D-Bus method.

978

979

Inserts property tags and interface annotation tags.

879

980

"""

880

981

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

881

982

connection)

888

989

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

889

990

return e

890

991

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

992

# Add property tags

891

993

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

892

994

for name, prop

893

in self._get_all_dbus_properties()

995

in self._get_all_dbus_things("property")

894

996

if prop._dbus_interface

895

997

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

896

998

if_tag.appendChild(tag)

999

# Add annotation tags

1000

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

1001

for tag in if_tag.getElementsByTagName(typ):

1002

annots = dict()

1003

for name, prop in (self.

1004

_get_all_dbus_things(typ)):

1005

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

1006

and prop._dbus_interface

1007

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

1008

annots.update(getattr

1009

(prop,

1010

"_dbus_annotations",

1011

{}))

1012

for name, value in annots.iteritems():

1013

ann_tag = document.createElement(

1014

"annotation")

1015

ann_tag.setAttribute("name", name)

1016

ann_tag.setAttribute("value", value)

1017

tag.appendChild(ann_tag)

1018

# Add interface annotation tags

1019

for annotation, value in dict(

1020

itertools.chain.from_iterable(

1021

annotations().iteritems()

1022

for name, annotations in

1023

self._get_all_dbus_things("interface")

1024

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

1025

)).iteritems():

1026

ann_tag = document.createElement("annotation")

1027

ann_tag.setAttribute("name", annotation)

1028

ann_tag.setAttribute("value", value)

1029

if_tag.appendChild(ann_tag)

897

1030

# Add the names to the return values for the

898

1031

# "org.freedesktop.DBus.Properties" methods

899

1032

if (if_tag.getAttribute("name")

914

1047

except (AttributeError, xml.dom.DOMException,

915

1048

xml.parsers.expat.ExpatError) as error:

916

1049

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

917

error)

1050

exc_info=error)

918

1051

return xmlstring

919

1052

920

1053

921

def datetime_to_dbus (dt, variant_level=0):

1054

def datetime_to_dbus(dt, variant_level=0):

922

1055

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

923

1056

if dt is None:

924

1057

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

926

1059

variant_level=variant_level)

927

1060

928

1061

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.

1062

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1063

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

1064

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

1065

interface names according to the "alt_interface_names" mapping.

1066

Usage:

1067

1068

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

1069

"net.example.AlternateInterface"})

1070

class SampleDBusObject(dbus.service.Object):

1071

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

1072

def SampleDBusMethod():

1073

pass

1074

1075

The above "SampleDBusMethod" on "SampleDBusObject" will be

1076

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

1077

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

1078

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

1079

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

1080

1081

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

1082

(from DBusObjectWithProperties) and interfaces (from the

1083

dbus_interface_annotations decorator).

933

1084

"""

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):

1085

def wrapper(cls):

1086

for orig_interface_name, alt_interface_name in (

1087

alt_interface_names.iteritems()):

1088

attr = {}

1089

interface_names = set()

1090

# Go though all attributes of the class

1091

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

941

1092

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

942

1093

# with the wrong interface name

943

1094

if (not hasattr(attribute, "_dbus_interface")

944

1095

or not attribute._dbus_interface

945

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

1096

.startswith(orig_interface_name)):

946

1097

continue

947

1098

# Create an alternate D-Bus interface name based on

948

1099

# the current name

949

1100

alt_interface = (attribute._dbus_interface

950

.replace("se.recompile.Mandos",

951

"se.bsnet.fukt.Mandos"))

1101

.replace(orig_interface_name,

1102

alt_interface_name))

1103

interface_names.add(alt_interface)

952

1104

# Is this a D-Bus signal?

953

1105

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

954

# Extract the original non-method function by

955

# black magic

1106

# Extract the original non-method undecorated

1107

# function by black magic

956

1108

nonmethod_func = (dict(

957

1109

zip(attribute.func_code.co_freevars,

958

1110

attribute.__closure__))["func"]

969

1121

nonmethod_func.func_name,

970

1122

nonmethod_func.func_defaults,

971

1123

nonmethod_func.func_closure)))

1124

# Copy annotations, if any

1125

try:

1126

new_function._dbus_annotations = (

1127

dict(attribute._dbus_annotations))

1128

except AttributeError:

1129

pass

972

1130

# 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

1131

# original and alternate functions, so both the

1132

# original and alternate signals gets sent when

1133

# the function is called

975

1134

def fixscope(func1, func2):

976

1135

"""This function is a scope container to pass

977

1136

func1 and func2 to the "call_both" function

984

1143

return call_both

985

1144

# Create the "call_both" function and add it to

986

1145

# the class

987

attr[attrname] = fixscope(attribute,

988

new_function)

1146

attr[attrname] = fixscope(attribute, new_function)

989

1147

# Is this a D-Bus method?

990

1148

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

991

1149

# Create a new, but exactly alike, function

1002

1160

attribute.func_name,

1003

1161

attribute.func_defaults,

1004

1162

attribute.func_closure)))

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1005

1169

# Is this a D-Bus property?

1006

1170

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

1007

1171

# Create a new, but exactly alike, function

1021

1185

attribute.func_name,

1022

1186

attribute.func_defaults,

1023

1187

attribute.func_closure)))

1024

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

1025

1026

1188

# Copy annotations, if any

1189

try:

1190

attr[attrname]._dbus_annotations = (

1191

dict(attribute._dbus_annotations))

1192

except AttributeError:

1193

pass

1194

# Is this a D-Bus interface?

1195

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

1196

# Create a new, but exactly alike, function

1197

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

1198

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

1199

# to the class.

1200

attr[attrname] = (dbus_interface_annotations

1201

(alt_interface)

1202

(types.FunctionType

1203

(attribute.func_code,

1204

attribute.func_globals,

1205

attribute.func_name,

1206

attribute.func_defaults,

1207

attribute.func_closure)))

1208

if deprecate:

1209

# Deprecate all alternate interfaces

1210

iname="_AlternateDBusNames_interface_annotation{0}"

1211

for interface_name in interface_names:

1212

@dbus_interface_annotations(interface_name)

1213

def func(self):

1214

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

1215

"true" }

1216

# Find an unused name

1217

for aname in (iname.format(i)

1218

for i in itertools.count()):

1219

if aname not in attr:

1220

attr[aname] = func

1221

break

1222

if interface_names:

1223

# Replace the class with a new subclass of it with

1224

# methods, signals, etc. as created above.

1225

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

1226

(cls,), attr)

1227

return cls

1228

return wrapper

1229

1230

1231

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

1232

"se.bsnet.fukt.Mandos"})

1027

1233

class ClientDBus(Client, DBusObjectWithProperties):

1028

1234

"""A Client class using D-Bus

1029

1235

1040

1246

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

1041

1247

self.bus = bus

1042

1248

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

1043

self._approvals_pending = 0

1044

1045

self._approvals_pending = 0

1046

1249

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

1047

1250

# the D-Bus

1048

1251

client_object_name = unicode(self.name).translate(

1052

1255

("/clients/" + client_object_name))

1053

1256

DBusObjectWithProperties.__init__(self, self.bus,

1054

1257

self.dbus_object_path)

1055

1258

1056

1259

def notifychangeproperty(transform_func,

1057

1260

dbus_name, type_func=lambda x: x,

1058

1261

variant_level=1):

1081

1284

1082

1285

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

1083

1286

1084

1085

1287

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1086

1288

approvals_pending = notifychangeproperty(dbus.Boolean,

1087

1289

"ApprovalPending",

1094

1296

checker is not None)

1095

1297

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1096

1298

"LastCheckedOK")

1299

last_checker_status = notifychangeproperty(dbus.Int16,

1300

"LastCheckerStatus")

1097

1301

last_approval_request = notifychangeproperty(

1098

1302

datetime_to_dbus, "LastApprovalRequest")

1099

1303

approved_by_default = notifychangeproperty(dbus.Boolean,

1149

1353

*args, **kwargs)

1150

1354

1151

1355

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

1152

old_checker = self.checker

1153

if self.checker is not None:

1154

old_checker_pid = self.checker.pid

1155

else:

1156

old_checker_pid = None

1356

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

1157

1357

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

1158

1358

# Only if new checker process was started

1159

1359

if (self.checker is not None

1167

1367

return False

1168

1368

1169

1369

def approve(self, value=True):

1170

self.send_changedstate()

1171

1370

self.approved = value

1172

1371

gobject.timeout_add(timedelta_to_milliseconds

1173

1372

(self.approval_duration),

1174

1373

self._reset_approved)

1175

1374

self.send_changedstate()

1176

1375

1177

1376

## D-Bus methods, signals & properties

1178

1377

_interface = "se.recompile.Mandos.Client"

1179

1378

1379

## Interfaces

1380

1381

@dbus_interface_annotations(_interface)

1382

def _foo(self):

1383

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

1384

"false"}

1385

1180

1386

## Signals

1181

1387

1182

1388

# CheckerCompleted - signal

1218

1424

"D-Bus signal"

1219

1425

return self.need_approval()

1220

1426

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

1427

## Methods

1230

1428

1231

1429

# Approve - method

1341

1539

return

1342

1540

return datetime_to_dbus(self.last_checked_ok)

1343

1541

1542

# LastCheckerStatus - property

1543

@dbus_service_property(_interface, signature="n",

1544

access="read")

1545

def LastCheckerStatus_dbus_property(self):

1546

return dbus.Int16(self.last_checker_status)

1547

1344

1548

# Expires - property

1345

1549

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

1346

1550

def Expires_dbus_property(self):

1357

1561

def Timeout_dbus_property(self, value=None):

1358

1562

if value is None: # get

1359

1563

return dbus.UInt64(self.timeout_milliseconds())

1564

old_timeout = self.timeout

1360

1565

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))

1566

# Reschedule disabling

1567

if self.enabled:

1568

now = datetime.datetime.utcnow()

1569

self.expires += self.timeout - old_timeout

1570

if self.expires <= now:

1571

# The timeout has passed

1572

self.disable()

1573

else:

1574

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

1575

is None):

1576

return

1577

gobject.source_remove(self.disable_initiator_tag)

1578

self.disable_initiator_tag = (

1579

gobject.timeout_add(

1580

timedelta_to_milliseconds(self.expires - now),

1581

self.disable))

1381

1582

1382

1583

# ExtendedTimeout - property

1383

1584

@dbus_service_property(_interface, signature="t",

1462

1663

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

1463

1664

1464

1665

1465

class ClientDBusTransitional(ClientDBus):

1466

__metaclass__ = AlternateDBusNamesMetaclass

1467

1468

1469

1666

class ClientHandler(socketserver.BaseRequestHandler, object):

1470

1667

"""A class to handle client connections.

1471

1668

1507

1704

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

1508

1705

try:

1509

1706

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

1510

raise RuntimeError

1707

raise RuntimeError(line)

1511

1708

except (ValueError, IndexError, RuntimeError) as error:

1512

1709

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

1513

1710

return

1539

1736

except KeyError:

1540

1737

return

1541

1738

1542

if self.server.use_dbus:

1543

# Emit D-Bus signal

1544

client.NewRequest(str(self.client_address))

1545

1546

1739

if client.approval_delay:

1547

1740

delay = client.approval_delay

1548

1741

client.approvals_pending += 1

1579

1772

#wait until timeout or approved

1580

1773

time = datetime.datetime.now()

1581

1774

client.changedstate.acquire()

1582

(client.changedstate.wait

1583

(float(client.timedelta_to_milliseconds(delay)

1584

/ 1000)))

1775

client.changedstate.wait(

1776

float(timedelta_to_milliseconds(delay)

1777

/ 1000))

1585

1778

client.changedstate.release()

1586

1779

time2 = datetime.datetime.now()

1587

1780

if (time2 - time) >= delay:

1603

1796

try:

1604

1797

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

1605

1798

except gnutls.errors.GNUTLSError as error:

1606

logger.warning("gnutls send failed")

1799

logger.warning("gnutls send failed",

1800

exc_info=error)

1607

1801

return

1608

1802

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

1609

1803

sent, len(client.secret)

1612

1806

1613

1807

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

1614

1808

# bump the timeout using extended_timeout

1615

client.checked_ok(client.extended_timeout)

1809

client.bump_timeout(client.extended_timeout)

1616

1810

if self.server.use_dbus:

1617

1811

# Emit D-Bus signal

1618

1812

client.GotSecret()

1623

1817

try:

1624

1818

session.bye()

1625

1819

except gnutls.errors.GNUTLSError as error:

1626

logger.warning("GnuTLS bye failed")

1820

logger.warning("GnuTLS bye failed",

1821

exc_info=error)

1627

1822

1628

1823

@staticmethod

1629

1824

def peer_certificate(session):

1701

1896

def process_request(self, request, address):

1702

1897

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

1703

1898

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

1704

args = (request,

1705

address))

1899

args = (request, address))

1706

1900

proc.start()

1707

1901

return proc

1708

1902

1723

1917

1724

1918

def add_pipe(self, parent_pipe, proc):

1725

1919

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

1726

raise NotImplementedError

1920

raise NotImplementedError()

1727

1921

1728

1922

1729

1923

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1736

1930

use_ipv6: Boolean; to use IPv6 or not

1737

1931

"""

1738

1932

def __init__(self, server_address, RequestHandlerClass,

1739

interface=None, use_ipv6=True):

1933

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

1934

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

1935

creating a new one with socket.socket().

1936

"""

1740

1937

self.interface = interface

1741

1938

if use_ipv6:

1742

1939

self.address_family = socket.AF_INET6

1940

if socketfd is not None:

1941

# Save the file descriptor

1942

self.socketfd = socketfd

1943

# Save the original socket.socket() function

1944

self.socket_socket = socket.socket

1945

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

1946

#

1947

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

1948

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

1949

# patching socket.socket.)

1950

#

1951

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

1952

@functools.wraps(socket.socket)

1953

def socket_wrapper(*args, **kwargs):

1954

# Restore original function so subsequent calls are

1955

# not affected.

1956

socket.socket = self.socket_socket

1957

del self.socket_socket

1958

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

1959

# saved file descriptor.

1960

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

1961

# Replace socket.socket() function with wrapper

1962

socket.socket = socket_wrapper

1963

# The socketserver.TCPServer.__init__ will call

1964

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

1965

# socket_wrapper(), if socketfd was set.

1743

1966

socketserver.TCPServer.__init__(self, server_address,

1744

1967

RequestHandlerClass)

1968

1745

1969

def server_bind(self):

1746

1970

"""This overrides the normal server_bind() function

1747

1971

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

1755

1979

try:

1756

1980

self.socket.setsockopt(socket.SOL_SOCKET,

1757

1981

SO_BINDTODEVICE,

1758

str(self.interface

1759

+ '\0'))

1982

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

1760

1983

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:

1984

if error.errno == errno.EPERM:

1985

logger.error("No permission to bind to"

1986

" interface %s", self.interface)

1987

elif error.errno == errno.ENOPROTOOPT:

1766

1988

logger.error("SO_BINDTODEVICE not available;"

1767

1989

" cannot bind to interface %s",

1768

1990

self.interface)

1991

elif error.errno == errno.ENODEV:

1992

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

1993

" cannot bind", self.interface)

1769

1994

else:

1770

1995

raise

1771

1996

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

1774

1999

if self.address_family == socket.AF_INET6:

1775

2000

any_address = "::" # in6addr_any

1776

2001

else:

1777

any_address = socket.INADDR_ANY

2002

any_address = "0.0.0.0" # INADDR_ANY

1778

2003

self.server_address = (any_address,

1779

2004

self.server_address[1])

1780

2005

elif not self.server_address[1]:

1801

2026

"""

1802

2027

def __init__(self, server_address, RequestHandlerClass,

1803

2028

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

1804

gnutls_priority=None, use_dbus=True):

2029

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

1805

2030

self.enabled = False

1806

2031

self.clients = clients

1807

2032

if self.clients is None:

1811

2036

IPv6_TCPServer.__init__(self, server_address,

1812

2037

RequestHandlerClass,

1813

2038

interface = interface,

1814

use_ipv6 = use_ipv6)

2039

use_ipv6 = use_ipv6,

2040

socketfd = socketfd)

1815

2041

def server_activate(self):

1816

2042

if self.enabled:

1817

2043

return socketserver.TCPServer.server_activate(self)

1830

2056

1831

2057

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

1832

2058

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

2059

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

1848

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

2060

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

1849

2061

# Wait for other process to exit

1850

2062

proc.join()

1851

2063

return False

1909

2121

return True

1910

2122

1911

2123

2124

def rfc3339_duration_to_delta(duration):

2125

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

2126

2127

>>> rfc3339_duration_to_delta("P7D")

2128

datetime.timedelta(7)

2129

>>> rfc3339_duration_to_delta("PT60S")

2130

datetime.timedelta(0, 60)

2131

>>> rfc3339_duration_to_delta("PT60M")

2132

datetime.timedelta(0, 3600)

2133

>>> rfc3339_duration_to_delta("PT24H")

2134

datetime.timedelta(1)

2135

>>> rfc3339_duration_to_delta("P1W")

2136

datetime.timedelta(7)

2137

>>> rfc3339_duration_to_delta("PT5M30S")

2138

datetime.timedelta(0, 330)

2139

>>> rfc3339_duration_to_delta("P1DT3M20S")

2140

datetime.timedelta(1, 200)

2141

"""

2142

2143

# Parsing an RFC 3339 duration with regular expressions is not

2144

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

2145

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

2146

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

2147

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

2148

# avoid excessive use of external libraries.

2149

2150

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

2151

Token = collections.namedtuple("Token",

2152

("regexp", # To match token; if

2153

# "value" is not None,

2154

# must have a "group"

2155

# containing digits

2156

"value", # datetime.timedelta or

2157

# None

2158

"followers")) # Tokens valid after

2159

# this token

2160

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

2161

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

2162

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

2163

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

2164

datetime.timedelta(seconds=1),

2165

frozenset((token_end,)))

2166

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

2167

datetime.timedelta(minutes=1),

2168

frozenset((token_second, token_end)))

2169

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

2170

datetime.timedelta(hours=1),

2171

frozenset((token_minute, token_end)))

2172

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

2173

None,

2174

frozenset((token_hour, token_minute,

2175

token_second)))

2176

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

2177

datetime.timedelta(days=1),

2178

frozenset((token_time, token_end)))

2179

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

2180

datetime.timedelta(weeks=4),

2181

frozenset((token_day, token_end)))

2182

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

2183

datetime.timedelta(weeks=52),

2184

frozenset((token_month, token_end)))

2185

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

2186

datetime.timedelta(weeks=1),

2187

frozenset((token_end,)))

2188

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

2189

frozenset((token_year, token_month,

2190

token_day, token_time,

2191

token_week))),

2192

# Define starting values

2193

value = datetime.timedelta() # Value so far

2194

found_token = None

2195

followers = frozenset(token_duration,) # Following valid tokens

2196

s = duration # String left to parse

2197

# Loop until end token is found

2198

while found_token is not token_end:

2199

# Search for any currently valid tokens

2200

for token in followers:

2201

match = token.regexp.match(s)

2202

if match is not None:

2203

# Token found

2204

if token.value is not None:

2205

# Value found, parse digits

2206

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

2207

# Add to value so far

2208

value += factor * token.value

2209

# Strip token from string

2210

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

2211

# Go to found token

2212

found_token = token

2213

# Set valid next tokens

2214

followers = found_token.followers

2215

break

2216

else:

2217

# No currently valid tokens were found

2218

raise ValueError("Invalid RFC 3339 duration")

2219

# End token found

2220

return value

2221

2222

1912

2223

def string_to_delta(interval):

1913

2224

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

1914

2225

1925

2236

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

1926

2237

datetime.timedelta(0, 330)

1927

2238

"""

2239

2240

try:

2241

return rfc3339_duration_to_delta(interval)

2242

except ValueError:

2243

pass

2244

1928

2245

timevalue = datetime.timedelta(0)

1929

2246

for s in interval.split():

1930

2247

try:

1941

2258

elif suffix == "w":

1942

2259

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

1943

2260

else:

1944

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

1945

except (ValueError, IndexError) as e:

2261

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

2262

.format(suffix))

2263

except IndexError as e:

1946

2264

raise ValueError(*(e.args))

1947

2265

timevalue += delta

1948

2266

return timevalue

1961

2279

sys.exit()

1962

2280

if not noclose:

1963

2281

# Close all standard open file descriptors

1964

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

2282

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

1965

2283

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

1966

2284

raise OSError(errno.ENODEV,

1967

"%s not a character device"

1968

% os.path.devnull)

2285

"{0} not a character device"

2286

.format(os.devnull))

1969

2287

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

1970

2288

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

1971

2289

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

1980

2298

1981

2299

parser = argparse.ArgumentParser()

1982

2300

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

1983

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

2301

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

1984

2302

help="show version number and exit")

1985

2303

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

1986

2304

help="Bind to interface IF")

1992

2310

help="Run self-test")

1993

2311

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

1994

2312

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

1995

" to terminal")

2313

" to terminal", default=None)

1996

2314

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

1997

2315

help="Debug level for stdout output")

1998

2316

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

2005

2323

" files")

2006

2324

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

2007

2325

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

2008

" system bus interface")

2326

" system bus interface", default=None)

2009

2327

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

2010

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

2328

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

2329

default=None)

2011

2330

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

2012

2331

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

2013

" state")

2332

" state", default=None)

2333

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

2334

help="Specify a file descriptor to a network"

2335

" socket to use instead of creating one")

2014

2336

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

2015

2337

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

2338

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

2339

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

2340

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

2341

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

2342

default=None)

2016

2343

2017

2344

options = parser.parse_args()

2018

2345

2019

2346

if options.check:

2020

2347

import doctest

2021

doctest.testmod()

2022

sys.exit()

2348

fail_count, test_count = doctest.testmod()

2349

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

2023

2350

2024

2351

# Default values for config file for server-global settings

2025

2352

server_defaults = { "interface": "",

2027

2354

"port": "",

2028

2355

"debug": "False",

2029

2356

"priority":

2030

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

2357

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

2031

2358

"servicename": "Mandos",

2032

2359

"use_dbus": "True",

2033

2360

"use_ipv6": "True",

2034

2361

"debuglevel": "",

2035

2362

"restore": "True",

2036

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

2363

"socket": "",

2364

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

2365

"foreground": "False",

2366

"zeroconf": "True",

2037

2367

}

2038

2368

2039

2369

# Parse config file for server-global settings

2044

2374

# Convert the SafeConfigParser object to a dict

2045

2375

server_settings = server_config.defaults()

2046

2376

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

2047

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

2377

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

2048

2378

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

2049

2379

option)

2050

2380

if server_settings["port"]:

2051

2381

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

2052

2382

"port")

2383

if server_settings["socket"]:

2384

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

2385

"socket")

2386

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

2387

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

2388

# happen with a supplied network socket.

2389

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

2390

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

2391

["socket"])

2053

2392

del server_config

2054

2393

2055

2394

# Override the settings from the config file with command line

2057

2396

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

2058

2397

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

2059

2398

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

2060

"statedir"):

2399

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

2061

2400

value = getattr(options, option)

2062

2401

if value is not None:

2063

2402

server_settings[option] = value

2066

2405

for option in server_settings.keys():

2067

2406

if type(server_settings[option]) is str:

2068

2407

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

2408

# Force all boolean options to be boolean

2409

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

2410

"foreground", "zeroconf"):

2411

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

2412

# Debug implies foreground

2413

if server_settings["debug"]:

2414

server_settings["foreground"] = True

2069

2415

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

2070

2416

2071

2417

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

2072

2418

2419

if (not server_settings["zeroconf"] and

2420

not (server_settings["port"]

2421

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

2422

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

2423

" Zeroconf")

2424

2073

2425

# For convenience

2074

2426

debug = server_settings["debug"]

2075

2427

debuglevel = server_settings["debuglevel"]

2077

2429

use_ipv6 = server_settings["use_ipv6"]

2078

2430

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

2079

2431

stored_state_file)

2432

foreground = server_settings["foreground"]

2433

zeroconf = server_settings["zeroconf"]

2080

2434

2081

2435

if debug:

2082

2436

initlogger(debug, logging.DEBUG)

2089

2443

2090

2444

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

2091

2445

syslogger.setFormatter(logging.Formatter

2092

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

2093

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

2094

% server_settings["servicename"]))

2446

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

2447

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

2448

.format(server_settings

2449

["servicename"])))

2095

2450

2096

2451

# Parse config file with clients

2097

client_config = configparser.SafeConfigParser(Client.client_defaults)

2452

client_config = configparser.SafeConfigParser(Client

2453

.client_defaults)

2098

2454

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

2099

2455

"clients.conf"))

2100

2456

2101

2457

global mandos_dbus_service

2102

2458

mandos_dbus_service = None

2103

2459

2460

socketfd = None

2461

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

2462

socketfd = server_settings["socket"]

2104

2463

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

2105

2464

server_settings["port"]),

2106

2465

ClientHandler,

2109

2468

use_ipv6=use_ipv6,

2110

2469

gnutls_priority=

2111

2470

server_settings["priority"],

2112

use_dbus=use_dbus)

2113

if not debug:

2114

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

2471

use_dbus=use_dbus,

2472

socketfd=socketfd)

2473

if not foreground:

2474

pidfilename = "/run/mandos.pid"

2475

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

2476

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

2477

pidfile = None

2115

2478

try:

2116

2479

pidfile = open(pidfilename, "w")

2117

except IOError:

2118

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

2480

except IOError as e:

2481

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

2482

exc_info=e)

2119

2483

2120

try:

2121

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

2122

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

2123

except KeyError:

2484

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

2124

2485

try:

2125

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

2126

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

2486

uid = pwd.getpwnam(name).pw_uid

2487

gid = pwd.getpwnam(name).pw_gid

2488

break

2127

2489

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

2490

continue

2491

else:

2492

uid = 65534

2493

gid = 65534

2134

2494

try:

2135

2495

os.setgid(gid)

2136

2496

os.setuid(uid)

2137

2497

except OSError as error:

2138

if error[0] != errno.EPERM:

2139

raise error

2498

if error.errno != errno.EPERM:

2499

raise

2140

2500

2141

2501

if debug:

2142

2502

# Enable all possible GnuTLS debugging

2153

2513

.gnutls_global_set_log_function(debug_gnutls))

2154

2514

2155

2515

# Redirect stdin so all checkers get /dev/null

2156

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

2516

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

2157

2517

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

2158

2518

if null > 2:

2159

2519

os.close(null)

2160

2520

2161

2521

# Need to fork before connecting to D-Bus

2162

if not debug:

2522

if not foreground:

2163

2523

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

2164

2524

daemon()

2165

2525

2526

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

2527

# need to inform gobject that threads will be used.

2166

2528

gobject.threads_init()

2167

2529

2168

2530

global main_loop

2169

2531

# From the Avahi example code

2170

DBusGMainLoop(set_as_default=True )

2532

DBusGMainLoop(set_as_default=True)

2171

2533

main_loop = gobject.MainLoop()

2172

2534

bus = dbus.SystemBus()

2173

2535

# End of Avahi example code

2179

2541

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

2180

2542

do_not_queue=True))

2181

2543

except dbus.exceptions.NameExistsException as e:

2182

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

2544

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

2183

2545

use_dbus = False

2184

2546

server_settings["use_dbus"] = False

2185

2547

tcp_server.use_dbus = False

2186

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2187

service = AvahiServiceToSyslog(name =

2188

server_settings["servicename"],

2189

servicetype = "_mandos._tcp",

2190

protocol = protocol, bus = bus)

2191

if server_settings["interface"]:

2192

service.interface = (if_nametoindex

2193

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

2548

if zeroconf:

2549

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2550

service = AvahiServiceToSyslog(name =

2551

server_settings["servicename"],

2552

servicetype = "_mandos._tcp",

2553

protocol = protocol, bus = bus)

2554

if server_settings["interface"]:

2555

service.interface = (if_nametoindex

2556

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

2194

2557

2195

2558

global multiprocessing_manager

2196

2559

multiprocessing_manager = multiprocessing.Manager()

2197

2560

2198

2561

client_class = Client

2199

2562

if use_dbus:

2200

client_class = functools.partial(ClientDBusTransitional,

2201

bus = bus)

2563

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

2202

2564

2203

2565

client_settings = Client.config_parser(client_config)

2204

2566

old_client_settings = {}

2205

2567

clients_data = {}

2206

2568

2569

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

2570

global wnull

2571

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

2572

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

2573

# mode

2574

if debug or not foreground:

2575

wnull.close()

2576

2207

2577

# Get client data and settings from last running state.

2208

2578

if server_settings["restore"]:

2209

2579

try:

2212

2582

(stored_state))

2213

2583

os.remove(stored_state_path)

2214

2584

except IOError as e:

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2585

if e.errno == errno.ENOENT:

2586

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

2587

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

2588

else:

2589

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

2590

exc_info=e)

2218

2591

raise

2219

2592

except EOFError as e:

2220

2593

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

2221

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

2594

"EOFError:", exc_info=e)

2222

2595

2223

2596

with PGPEngine() as pgp:

2224

2597

for client_name, client in clients_data.iteritems():

2598

# Skip removed clients

2599

if client_name not in client_settings:

2600

continue

2601

2225

2602

# Decide which value to use after restoring saved state.

2226

2603

# We have three different values: Old config file,

2227

2604

# new config file, and saved state.

2241

2618

2242

2619

# Clients who has passed its expire date can still be

2243

2620

# 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.

2621

# whose checker succeeded before we stored its state is

2622

# assumed to have successfully run all checkers during

2623

# downtime.

2246

2624

if client["enabled"]:

2247

2625

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

2248

2626

if not client["last_checked_ok"]:

2249

2627

logger.warning(

2250

2628

"disabling client {0} - Client never "

2251

"performed a successfull checker"

2252

.format(client["name"]))

2629

"performed a successful checker"

2630

.format(client_name))

2253

2631

client["enabled"] = False

2254

2632

elif client["last_checker_status"] != 0:

2255

2633

logger.warning(

2256

2634

"disabling client {0} - Client "

2257

2635

"last checker failed with error code {1}"

2258

.format(client["name"],

2636

.format(client_name,

2259

2637

client["last_checker_status"]))

2260

2638

client["enabled"] = False

2261

2639

else:

2262

2640

client["expires"] = (datetime.datetime

2263

2641

.utcnow()

2264

2642

+ client["timeout"])

2265

2643

logger.debug("Last checker succeeded,"

2644

" keeping {0} enabled"

2645

.format(client_name))

2266

2646

try:

2267

2647

client["secret"] = (

2268

2648

pgp.decrypt(client["encrypted_secret"],

2274

2654

.format(client_name))

2275

2655

client["secret"] = (

2276

2656

client_settings[client_name]["secret"])

2277

2278

2657

2279

2658

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

2280

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

2659

for client_name in (set(old_client_settings)

2660

- set(client_settings)):

2281

2661

del clients_data[client_name]

2282

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

2662

for client_name in (set(client_settings)

2663

- set(old_client_settings)):

2283

2664

clients_data[client_name] = client_settings[client_name]

2284

2285

# Create clients all clients

2665

2666

# Create all client objects

2286

2667

for client_name, client in clients_data.iteritems():

2287

2668

tcp_server.clients[client_name] = client_class(

2288

name = client_name, settings = client)

2669

name = client_name, settings = client,

2670

server_settings = server_settings)

2289

2671

2290

2672

if not tcp_server.clients:

2291

2673

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

2674

2675

if not foreground:

2676

if pidfile is not None:

2677

try:

2678

with pidfile:

2679

pid = os.getpid()

2680

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

2681

except IOError:

2682

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

2683

pidfilename, pid)

2684

del pidfile

2305

2685

del pidfilename

2306

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

2307

2686

2308

2687

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

2309

2688

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

2310

2689

2311

2690

if use_dbus:

2312

class MandosDBusService(dbus.service.Object):

2691

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

2692

"se.bsnet.fukt.Mandos"})

2693

class MandosDBusService(DBusObjectWithProperties):

2313

2694

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

2314

2695

def __init__(self):

2315

2696

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

2316

2697

_interface = "se.recompile.Mandos"

2317

2698

2699

@dbus_interface_annotations(_interface)

2700

def _foo(self):

2701

return { "org.freedesktop.DBus.Property"

2702

".EmitsChangedSignal":

2703

"false"}

2704

2318

2705

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

2319

2706

def ClientAdded(self, objpath):

2320

2707

"D-Bus signal"

2362

2749

2363

2750

del _interface

2364

2751

2365

class MandosDBusServiceTransitional(MandosDBusService):

2366

__metaclass__ = AlternateDBusNamesMetaclass

2367

mandos_dbus_service = MandosDBusServiceTransitional()

2752

mandos_dbus_service = MandosDBusService()

2368

2753

2369

2754

def cleanup():

2370

2755

"Cleanup function; run on exit"

2371

service.cleanup()

2756

if zeroconf:

2757

service.cleanup()

2372

2758

2373

2759

multiprocessing.active_children()

2760

wnull.close()

2374

2761

if not (tcp_server.clients or client_settings):

2375

2762

return

2376

2763

2388

2775

# A list of attributes that can not be pickled

2389

2776

# + secret.

2390

2777

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

2391

"checker"))

2778

"checker", "server_settings"))

2392

2779

for name, typ in (inspect.getmembers

2393

2780

(dbus.service.Object)):

2394

2781

exclude.add(name)

2403

2790

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

2404

2791

2405

2792

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:

2793

with (tempfile.NamedTemporaryFile

2794

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

2795

dir=os.path.dirname(stored_state_path),

2796

delete=False)) as stored_state:

2411

2797

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

2798

tempname=stored_state.name

2412

2799

os.rename(tempname, stored_state_path)

2413

2800

except (IOError, OSError) as e:

2414

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

2415

.format(e))

2416

2801

if not debug:

2417

2802

try:

2418

2803

os.remove(tempname)

2419

2804

except NameError:

2420

2805

pass

2421

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

2422

errno.EEXIST)):

2423

raise e

2806

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

2807

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

2808

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

2809

else:

2810

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

2811

exc_info=e)

2812

raise

2424

2813

2425

2814

# Delete all clients, and settings from config

2426

2815

while tcp_server.clients:

2450

2839

tcp_server.server_activate()

2451

2840

2452

2841

# Find out what port we got

2453

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

2842

if zeroconf:

2843

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

2454

2844

if use_ipv6:

2455

2845

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

2456

" flowinfo %d, scope_id %d"

2457

% tcp_server.socket.getsockname())

2846

" flowinfo %d, scope_id %d",

2847

*tcp_server.socket.getsockname())

2458

2848

else: # IPv4

2459

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

2460

% tcp_server.socket.getsockname())

2849

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

2850

*tcp_server.socket.getsockname())

2461

2851

2462

2852

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

2463

2853

2464

2854

try:

2465

# From the Avahi example code

2466

try:

2467

service.activate()

2468

except dbus.exceptions.DBusException as error:

2469

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

2470

cleanup()

2471

sys.exit(1)

2472

# End of Avahi example code

2855

if zeroconf:

2856

# From the Avahi example code

2857

try:

2858

service.activate()

2859

except dbus.exceptions.DBusException as error:

2860

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

2861

cleanup()

2862

sys.exit(1)

2863

# End of Avahi example code

2473

2864

2474

2865

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

2475

2866

lambda *args, **kwargs:

2479

2870

logger.debug("Starting main loop")

2480

2871

main_loop.run()

2481

2872

except AvahiError as error:

2482

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

2873

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

2483

2874

cleanup()

2484

2875

sys.exit(1)

2485

2876

except KeyboardInterrupt: