/mandos/trunk : revision 505.3.6

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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 cPickle as pickle

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import multiprocessing

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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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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.6.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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version = "1.4.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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(ctypes.util.find_library("c"))

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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"Get an interface index the hard way, i.e. using fcntl()"

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SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

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with contextlib.closing(socket.socket()) as s:

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(str("16s16x"),

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interface))

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interface_index = struct.unpack(str("I"),

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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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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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(asctime)s %(name)s'

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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"""Exception if encryption/decryption fails"""

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pass

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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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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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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for root, dirs, files in os.walk(self.tempdir,

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topdown = False):

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for filename in files:

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os.remove(os.path.join(root, filename))

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for dirname in dirs:

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os.rmdir(os.path.join(root, dirname))

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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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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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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.GetAlternativeServiceName(self.name))

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logger.info("Changing Zeroconf service name to %r ...",

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self.name)

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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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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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logger.debug("Adding Zeroconf service '%s' of type '%s' ...",

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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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(self.server.GetState())

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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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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Attributes:

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approved: bool(); 'None' if not yet approved/disapproved

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_approved: bool(); 'None' if not yet approved/disapproved

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approval_delay: datetime.timedelta(); Time to wait for approval

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approval_duration: datetime.timedelta(); Duration of one approval

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checker: subprocess.Popen(); a running checker process used

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instance %(name)s can be used in the command.

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checker_initiator_tag: a gobject event source tag, or None

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created: datetime.datetime(); (UTC) object creation

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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disable_hook: If set, called by disable() as disable_hook(self)

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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fingerprint: string (40 or 32 hexadecimal digits); used to

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interval: datetime.timedelta(); How often to start a new checker

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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return _timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return _timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return _timedelta_to_milliseconds(self.interval)

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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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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client = settings[client_name] = {}

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client["host"] = section["host"]

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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client["secret"] = section["secret"].decode("base64")

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elif "secfile" in section:

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with open(os.path.expanduser(os.path.expandvars

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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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["interval"] = string_to_delta(section["interval"])

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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return _timedelta_to_milliseconds(self.approval_delay)

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def __init__(self, name = None, disable_hook=None, config=None):

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

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

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attribute."""

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self.name = name

532

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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if config is None:

340

config = {}

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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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self.fingerprint = (config["fingerprint"].upper()

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.replace(" ", ""))

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

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self.created = settings.get("created",

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datetime.datetime.utcnow())

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# attributes specific for this server instance

348

if "secret" in config:

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self.secret = config["secret"].decode("base64")

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elif "secfile" in config:

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with open(os.path.expanduser(os.path.expandvars

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(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

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self.host = config.get("host", "")

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self.created = datetime.datetime.utcnow()

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self.enabled = False

361

self.last_approval_request = None

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self.last_enabled = None

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self.last_checked_ok = None

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self.timeout = string_to_delta(config["timeout"])

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self.extended_timeout = string_to_delta(config

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["extended_timeout"])

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self.interval = string_to_delta(config["interval"])

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self.disable_hook = disable_hook

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

372

self.expires = None

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self.checker_callback_tag = None

374

self.checker_command = config["checker"]

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self.current_checker_command = None

563

self.approved = None

376

self.last_connect = None

377

self._approved = None

378

self.approved_by_default = config.get("approved_by_default",

379

True)

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self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

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.Condition(multiprocessing_manager

567

387

.Lock()))

568

self.client_structure = [attr for attr in

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self.__dict__.iterkeys()

570

if not attr.startswith("_")]

571

self.client_structure.append("client_structure")

572

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for name, t in inspect.getmembers(type(self),

574

lambda obj:

575

isinstance(obj,

576

property)):

577

if not name.startswith("_"):

578

self.client_structure.append(name)

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# Send notice to process children that client state has changed

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389

def send_changedstate(self):

582

with self.changedstate:

583

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

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def enable(self):

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"""Start this client's checker and timeout hooks"""

587

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

588

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# Already enabled

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398

return

590

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

591

self.enabled = True

592

self.last_enabled = datetime.datetime.utcnow()

593

self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

597

"""Disable this client."""

598

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

599

return False

600

if not quiet:

601

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

602

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

603

gobject.source_remove(self.disable_initiator_tag)

604

self.disable_initiator_tag = None

605

self.expires = None

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

607

gobject.source_remove(self.checker_initiator_tag)

608

self.checker_initiator_tag = None

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self.stop_checker()

610

self.enabled = False

611

if not quiet:

612

self.send_changedstate()

613

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

614

return False

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616

def __del__(self):

617

self.disable()

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619

def init_checker(self):

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

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# and every interval from then on.

622

if self.checker_initiator_tag is not None:

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gobject.source_remove(self.checker_initiator_tag)

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402

self.checker_initiator_tag = (gobject.timeout_add

625

403

(self.interval_milliseconds(),

626

404

self.start_checker))

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

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

406

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

630

407

self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

410

self.enabled = True

411

self.last_enabled = datetime.datetime.utcnow()

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# Also start a new checker *right now*.

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self.start_checker()

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415

def disable(self, quiet=True):

416

"""Disable this client."""

417

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

418

return False

419

if not quiet:

420

self.send_changedstate()

421

if not quiet:

422

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

423

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

424

gobject.source_remove(self.disable_initiator_tag)

425

self.disable_initiator_tag = None

426

self.expires = None

427

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

428

gobject.source_remove(self.checker_initiator_tag)

429

self.checker_initiator_tag = None

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

433

self.enabled = False

434

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

435

return False

436

437

def __del__(self):

438

self.disable_hook = None

439

self.disable()

440

636

441

def checker_callback(self, pid, condition, command):

637

442

"""The checker has completed, so take appropriate actions."""

638

443

self.checker_callback_tag = None

639

444

self.checker = None

640

445

if os.WIFEXITED(condition):

641

self.last_checker_status = os.WEXITSTATUS(condition)

642

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

643

448

logger.info("Checker for %(name)s succeeded",

644

449

vars(self))

645

450

self.checked_ok()

647

452

logger.info("Checker for %(name)s failed",

648

453

vars(self))

649

454

else:

650

self.last_checker_status = -1

651

455

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

652

456

vars(self))

653

457

654

def checked_ok(self):

655

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

656

self.last_checked_ok = datetime.datetime.utcnow()

657

self.last_checker_status = 0

658

self.bump_timeout()

659

660

def bump_timeout(self, timeout=None):

661

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

458

def checked_ok(self, timeout=None):

459

"""Bump up the timeout for this client.

460

461

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

462

alive and well.

463

"""

662

464

if timeout is None:

663

465

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

664

467

if self.disable_initiator_tag is not None:

665

468

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

667

469

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

668

470

self.disable_initiator_tag = (gobject.timeout_add

669

(timedelta_to_milliseconds

471

(_timedelta_to_milliseconds

670

472

(timeout), self.disable))

671

473

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

672

474

679

481

If a checker already exists, leave it running and do

680

482

nothing."""

681

483

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

682

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

683

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

684

# would inevitably timeout, since no checker would get a

685

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

484

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

485

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

486

# client would inevitably timeout, since no checker would get

487

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

686

488

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

687

489

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

688

490

# should be.

702

504

self.current_checker_command)

703

505

# Start a new checker if needed

704

506

if self.checker is None:

705

# Escape attributes for the shell

706

escaped_attrs = dict(

707

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

708

for attr in

709

self.runtime_expansions)

710

507

try:

711

command = self.checker_command % escaped_attrs

712

except TypeError as error:

713

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

714

self.checker_command, exc_info=error)

715

return True # Try again later

508

# In case checker_command has exactly one % operator

509

command = self.checker_command % self.host

510

except TypeError:

511

# Escape attributes for the shell

512

escaped_attrs = dict(

513

(attr,

514

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

515

errors=

516

'replace')))

517

for attr in

518

self.runtime_expansions)

519

520

try:

521

command = self.checker_command % escaped_attrs

522

except TypeError as error:

523

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

524

' %s', self.checker_command, error)

525

return True # Try again later

716

526

self.current_checker_command = command

717

527

try:

718

528

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

721

531

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

722

532

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

723

533

# always replaced by /dev/null.)

724

# The exception is when not debugging but nevertheless

725

# running in the foreground; use the previously

726

# created wnull.

727

popen_args = {}

728

if (not self.server_settings["debug"]

729

and self.server_settings["foreground"]):

730

popen_args.update({"stdout": wnull,

731

"stderr": wnull })

732

534

self.checker = subprocess.Popen(command,

733

535

close_fds=True,

734

shell=True, cwd="/",

735

**popen_args)

736

except OSError as error:

737

logger.error("Failed to start subprocess",

738

exc_info=error)

739

return True

740

self.checker_callback_tag = (gobject.child_watch_add

741

(self.checker.pid,

742

self.checker_callback,

743

data=command))

744

# The checker may have completed before the gobject

745

# watch was added. Check for this.

746

try:

536

shell=True, cwd="/")

537

self.checker_callback_tag = (gobject.child_watch_add

538

(self.checker.pid,

539

self.checker_callback,

540

data=command))

541

# The checker may have completed before the gobject

542

# watch was added. Check for this.

747

543

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

544

if pid:

545

gobject.source_remove(self.checker_callback_tag)

546

self.checker_callback(pid, status, command)

748

547

except OSError as error:

749

if error.errno == errno.ECHILD:

750

# This should never happen

751

logger.error("Child process vanished",

752

exc_info=error)

753

return True

754

raise

755

if pid:

756

gobject.source_remove(self.checker_callback_tag)

757

self.checker_callback(pid, status, command)

548

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

549

error)

758

550

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

759

551

return True

760

552

767

559

return

768

560

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

769

561

try:

770

self.checker.terminate()

562

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

771

563

#time.sleep(0.5)

772

564

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

773

# self.checker.kill()

565

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

774

566

except OSError as error:

775

567

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

776

568

raise

793

585

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

794

586

if byte_arrays and signature != "ay":

795

587

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

796

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

588

" signature %r" % signature)

797

589

def decorator(func):

798

590

func._dbus_is_property = True

799

591

func._dbus_interface = dbus_interface

807

599

return decorator

808

600

809

601

810

def dbus_interface_annotations(dbus_interface):

811

"""Decorator for marking functions returning interface annotations

812

813

Usage:

814

815

@dbus_interface_annotations("org.example.Interface")

816

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

817

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

818

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

819

"false"}

820

"""

821

def decorator(func):

822

func._dbus_is_interface = True

823

func._dbus_interface = dbus_interface

824

func._dbus_name = dbus_interface

825

return func

826

return decorator

827

828

829

def dbus_annotations(annotations):

830

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

831

Usage:

832

833

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

834

access="r")

835

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

836

"org.freedesktop.DBus.Property."

837

"EmitsChangedSignal": "false"})

838

def Property_dbus_property(self):

839

return dbus.Boolean(False)

840

"""

841

def decorator(func):

842

func._dbus_annotations = annotations

843

return func

844

return decorator

845

846

847

602

class DBusPropertyException(dbus.exceptions.DBusException):

848

603

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

849

604

"""

872

627

"""

873

628

874

629

@staticmethod

875

def _is_dbus_thing(thing):

876

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

877

878

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

879

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

880

"""

881

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

882

False)

630

def _is_dbus_property(obj):

631

return getattr(obj, "_dbus_is_property", False)

883

632

884

def _get_all_dbus_things(self, thing):

633

def _get_all_dbus_properties(self):

885

634

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

886

635

"""

887

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

888

name),

889

athing.__get__(self))

636

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

890

637

for cls in self.__class__.__mro__

891

for name, athing in

892

inspect.getmembers(cls,

893

self._is_dbus_thing(thing)))

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

894

640

895

641

def _get_dbus_property(self, interface_name, property_name):

896

642

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

898

644

"""

899

645

for cls in self.__class__.__mro__:

900

646

for name, value in (inspect.getmembers

901

(cls,

902

self._is_dbus_thing("property"))):

647

(cls, self._is_dbus_property)):

903

648

if (value._dbus_name == property_name

904

649

and value._dbus_interface == interface_name):

905

650

return value.__get__(self)

934

679

# signatures other than "ay".

935

680

if prop._dbus_signature != "ay":

936

681

raise ValueError

937

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

938

for byte in value))

682

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

683

for byte in value))

939

684

prop(value)

940

685

941

686

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

946

691

947

692

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

948

693

"""

949

properties = {}

950

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

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

951

696

if (interface_name

952

697

and interface_name != prop._dbus_interface):

953

698

# Interface non-empty but did not match

957

702

continue

958

703

value = prop()

959

704

if not hasattr(value, "variant_level"):

960

properties[name] = value

705

all[name] = value

961

706

continue

962

properties[name] = type(value)(value, variant_level=

963

value.variant_level+1)

964

return dbus.Dictionary(properties, signature="sv")

707

all[name] = type(value)(value, variant_level=

708

value.variant_level+1)

709

return dbus.Dictionary(all, signature="sv")

965

710

966

711

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

967

712

out_signature="s",

968

713

path_keyword='object_path',

969

714

connection_keyword='connection')

970

715

def Introspect(self, object_path, connection):

971

"""Overloading of standard D-Bus method.

972

973

Inserts property tags and interface annotation tags.

716

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

974

717

"""

975

718

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

976

719

connection)

983

726

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

984

727

return e

985

728

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

986

# Add property tags

987

729

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

988

730

for name, prop

989

in self._get_all_dbus_things("property")

731

in self._get_all_dbus_properties()

990

732

if prop._dbus_interface

991

733

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

992

734

if_tag.appendChild(tag)

993

# Add annotation tags

994

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

995

for tag in if_tag.getElementsByTagName(typ):

996

annots = dict()

997

for name, prop in (self.

998

_get_all_dbus_things(typ)):

999

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

1000

and prop._dbus_interface

1001

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

1002

annots.update(getattr

1003

(prop,

1004

"_dbus_annotations",

1005

{}))

1006

for name, value in annots.iteritems():

1007

ann_tag = document.createElement(

1008

"annotation")

1009

ann_tag.setAttribute("name", name)

1010

ann_tag.setAttribute("value", value)

1011

tag.appendChild(ann_tag)

1012

# Add interface annotation tags

1013

for annotation, value in dict(

1014

itertools.chain.from_iterable(

1015

annotations().iteritems()

1016

for name, annotations in

1017

self._get_all_dbus_things("interface")

1018

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

1019

)).iteritems():

1020

ann_tag = document.createElement("annotation")

1021

ann_tag.setAttribute("name", annotation)

1022

ann_tag.setAttribute("value", value)

1023

if_tag.appendChild(ann_tag)

1024

735

# Add the names to the return values for the

1025

736

# "org.freedesktop.DBus.Properties" methods

1026

737

if (if_tag.getAttribute("name")

1041

752

except (AttributeError, xml.dom.DOMException,

1042

753

xml.parsers.expat.ExpatError) as error:

1043

754

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

1044

exc_info=error)

755

error)

1045

756

return xmlstring

1046

757

1047

758

1048

def datetime_to_dbus(dt, variant_level=0):

759

def datetime_to_dbus (dt, variant_level=0):

1049

760

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

1050

761

if dt is None:

1051

762

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

1052

763

return dbus.String(dt.isoformat(),

1053

764

variant_level=variant_level)

1054

765

1055

1056

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1057

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

1058

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

1059

interface names according to the "alt_interface_names" mapping.

1060

Usage:

1061

1062

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

1063

"net.example.AlternateInterface"})

1064

class SampleDBusObject(dbus.service.Object):

1065

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

1066

def SampleDBusMethod():

1067

pass

1068

1069

The above "SampleDBusMethod" on "SampleDBusObject" will be

1070

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

1071

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

1072

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

1073

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

1074

1075

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

1076

(from DBusObjectWithProperties) and interfaces (from the

1077

dbus_interface_annotations decorator).

766

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

767

.__metaclass__):

768

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

769

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

1078

770

"""

1079

def wrapper(cls):

1080

for orig_interface_name, alt_interface_name in (

1081

alt_interface_names.iteritems()):

1082

attr = {}

1083

interface_names = set()

1084

# Go though all attributes of the class

1085

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

771

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

772

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

773

# methods, signals, or properties in them

774

for base in (b for b in bases

775

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

776

# Go though all attributes of the base class

777

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

1086

778

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

1087

779

# with the wrong interface name

1088

780

if (not hasattr(attribute, "_dbus_interface")

1089

781

or not attribute._dbus_interface

1090

.startswith(orig_interface_name)):

782

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

1091

783

continue

1092

784

# Create an alternate D-Bus interface name based on

1093

785

# the current name

1094

786

alt_interface = (attribute._dbus_interface

1095

.replace(orig_interface_name,

1096

alt_interface_name))

1097

interface_names.add(alt_interface)

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1098

789

# Is this a D-Bus signal?

1099

790

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

1100

# Extract the original non-method undecorated

1101

# function by black magic

791

# Extract the original non-method function by

792

# black magic

1102

793

nonmethod_func = (dict(

1103

794

zip(attribute.func_code.co_freevars,

1104

795

attribute.__closure__))["func"]

1115

806

nonmethod_func.func_name,

1116

807

nonmethod_func.func_defaults,

1117

808

nonmethod_func.func_closure)))

1118

# Copy annotations, if any

1119

try:

1120

new_function._dbus_annotations = (

1121

dict(attribute._dbus_annotations))

1122

except AttributeError:

1123

pass

1124

809

# Define a creator of a function to call both the

1125

# original and alternate functions, so both the

1126

# original and alternate signals gets sent when

1127

# the function is called

810

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

811

# signals gets sent when the function is called

1128

812

def fixscope(func1, func2):

1129

813

"""This function is a scope container to pass

1130

814

func1 and func2 to the "call_both" function

1137

821

return call_both

1138

822

# Create the "call_both" function and add it to

1139

823

# the class

1140

attr[attrname] = fixscope(attribute, new_function)

824

attr[attrname] = fixscope(attribute,

825

new_function)

1141

826

# Is this a D-Bus method?

1142

827

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

1143

828

# Create a new, but exactly alike, function

1154

839

attribute.func_name,

1155

840

attribute.func_defaults,

1156

841

attribute.func_closure)))

1157

# Copy annotations, if any

1158

try:

1159

attr[attrname]._dbus_annotations = (

1160

dict(attribute._dbus_annotations))

1161

except AttributeError:

1162

pass

1163

842

# Is this a D-Bus property?

1164

843

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

1165

844

# Create a new, but exactly alike, function

1179

858

attribute.func_name,

1180

859

attribute.func_defaults,

1181

860

attribute.func_closure)))

1182

# Copy annotations, if any

1183

try:

1184

attr[attrname]._dbus_annotations = (

1185

dict(attribute._dbus_annotations))

1186

except AttributeError:

1187

pass

1188

# Is this a D-Bus interface?

1189

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

1190

# Create a new, but exactly alike, function

1191

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

1192

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

1193

# to the class.

1194

attr[attrname] = (dbus_interface_annotations

1195

(alt_interface)

1196

(types.FunctionType

1197

(attribute.func_code,

1198

attribute.func_globals,

1199

attribute.func_name,

1200

attribute.func_defaults,

1201

attribute.func_closure)))

1202

if deprecate:

1203

# Deprecate all alternate interfaces

1204

iname="_AlternateDBusNames_interface_annotation{0}"

1205

for interface_name in interface_names:

1206

@dbus_interface_annotations(interface_name)

1207

def func(self):

1208

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

1209

"true" }

1210

# Find an unused name

1211

for aname in (iname.format(i)

1212

for i in itertools.count()):

1213

if aname not in attr:

1214

attr[aname] = func

1215

break

1216

if interface_names:

1217

# Replace the class with a new subclass of it with

1218

# methods, signals, etc. as created above.

1219

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

1220

(cls,), attr)

1221

return cls

1222

return wrapper

1223

1224

1225

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

1226

"se.bsnet.fukt.Mandos"})

861

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

862

1227

863

class ClientDBus(Client, DBusObjectWithProperties):

1228

864

"""A Client class using D-Bus

1229

865

1238

874

# dbus.service.Object doesn't use super(), so we can't either.

1239

875

1240

876

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

877

self._approvals_pending = 0

1241

878

self.bus = bus

1242

879

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

1243

880

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

1249

886

("/clients/" + client_object_name))

1250

887

DBusObjectWithProperties.__init__(self, self.bus,

1251

888

self.dbus_object_path)

1252

889

1253

890

def notifychangeproperty(transform_func,

1254

891

dbus_name, type_func=lambda x: x,

1255

892

variant_level=1):

1256

893

""" Modify a variable so that it's a property which announces

1257

894

its changes to DBus.

1258

895

1259

896

transform_fun: Function that takes a value and a variant_level

1260

897

and transforms it to a D-Bus type.

1261

898

dbus_name: D-Bus name of the variable

1278

915

1279

916

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

1280

917

918

1281

919

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1282

920

approvals_pending = notifychangeproperty(dbus.Boolean,

1283

921

"ApprovalPending",

1290

928

checker is not None)

1291

929

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1292

930

"LastCheckedOK")

1293

last_checker_status = notifychangeproperty(dbus.Int16,

1294

"LastCheckerStatus")

1295

931

last_approval_request = notifychangeproperty(

1296

932

datetime_to_dbus, "LastApprovalRequest")

1297

933

approved_by_default = notifychangeproperty(dbus.Boolean,

1298

934

"ApprovedByDefault")

1299

approval_delay = notifychangeproperty(dbus.UInt64,

935

approval_delay = notifychangeproperty(dbus.UInt16,

1300

936

"ApprovalDelay",

1301

937

type_func =

1302

timedelta_to_milliseconds)

938

_timedelta_to_milliseconds)

1303

939

approval_duration = notifychangeproperty(

1304

dbus.UInt64, "ApprovalDuration",

1305

type_func = timedelta_to_milliseconds)

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1306

942

host = notifychangeproperty(dbus.String, "Host")

1307

timeout = notifychangeproperty(dbus.UInt64, "Timeout",

943

timeout = notifychangeproperty(dbus.UInt16, "Timeout",

1308

944

type_func =

1309

timedelta_to_milliseconds)

945

_timedelta_to_milliseconds)

1310

946

extended_timeout = notifychangeproperty(

1311

dbus.UInt64, "ExtendedTimeout",

1312

type_func = timedelta_to_milliseconds)

1313

interval = notifychangeproperty(dbus.UInt64,

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1314

950

"Interval",

1315

951

type_func =

1316

timedelta_to_milliseconds)

952

_timedelta_to_milliseconds)

1317

953

checker_command = notifychangeproperty(dbus.String, "Checker")

1318

954

1319

955

del notifychangeproperty

1361

997

return r

1362

998

1363

999

def _reset_approved(self):

1364

self.approved = None

1000

self._approved = None

1365

1001

return False

1366

1002

1367

1003

def approve(self, value=True):

1368

self.approved = value

1369

gobject.timeout_add(timedelta_to_milliseconds

1004

self.send_changedstate()

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1370

1007

(self.approval_duration),

1371

1008

self._reset_approved)

1372

self.send_changedstate()

1009

1373

1010

1374

1011

## D-Bus methods, signals & properties

1375

1012

_interface = "se.recompile.Mandos.Client"

1376

1013

1377

## Interfaces

1378

1379

@dbus_interface_annotations(_interface)

1380

def _foo(self):

1381

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

1382

"false"}

1383

1384

1014

## Signals

1385

1015

1386

1016

# CheckerCompleted - signal

1485

1115

access="readwrite")

1486

1116

def ApprovalDuration_dbus_property(self, value=None):

1487

1117

if value is None: # get

1488

return dbus.UInt64(timedelta_to_milliseconds(

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1489

1119

self.approval_duration))

1490

1120

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

1491

1121

1505

1135

def Host_dbus_property(self, value=None):

1506

1136

if value is None: # get

1507

1137

return dbus.String(self.host)

1508

self.host = unicode(value)

1138

self.host = value

1509

1139

1510

1140

# Created - property

1511

1141

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

1512

1142

def Created_dbus_property(self):

1513

return datetime_to_dbus(self.created)

1143

return dbus.String(datetime_to_dbus(self.created))

1514

1144

1515

1145

# LastEnabled - property

1516

1146

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

1537

1167

return

1538

1168

return datetime_to_dbus(self.last_checked_ok)

1539

1169

1540

# LastCheckerStatus - property

1541

@dbus_service_property(_interface, signature="n",

1542

access="read")

1543

def LastCheckerStatus_dbus_property(self):

1544

return dbus.Int16(self.last_checker_status)

1545

1546

1170

# Expires - property

1547

1171

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

1548

1172

def Expires_dbus_property(self):

1559

1183

def Timeout_dbus_property(self, value=None):

1560

1184

if value is None: # get

1561

1185

return dbus.UInt64(self.timeout_milliseconds())

1562

old_timeout = self.timeout

1563

1186

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

1564

# Reschedule disabling

1565

if self.enabled:

1566

now = datetime.datetime.utcnow()

1567

self.expires += self.timeout - old_timeout

1568

if self.expires <= now:

1569

# The timeout has passed

1570

self.disable()

1571

else:

1572

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

1573

is None):

1574

return

1575

gobject.source_remove(self.disable_initiator_tag)

1576

self.disable_initiator_tag = (

1577

gobject.timeout_add(

1578

timedelta_to_milliseconds(self.expires - now),

1579

self.disable))

1187

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

1188

return

1189

# Reschedule timeout

1190

gobject.source_remove(self.disable_initiator_tag)

1191

self.disable_initiator_tag = None

1192

self.expires = None

1193

time_to_die = _timedelta_to_milliseconds((self

1194

.last_checked_ok

1195

+ self.timeout)

1196

- datetime.datetime

1197

.utcnow())

1198

if time_to_die <= 0:

1199

# The timeout has passed

1200

self.disable()

1201

else:

1202

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

1203

+ datetime.timedelta(milliseconds =

1204

time_to_die))

1205

self.disable_initiator_tag = (gobject.timeout_add

1206

(time_to_die, self.disable))

1580

1207

1581

1208

# ExtendedTimeout - property

1582

1209

@dbus_service_property(_interface, signature="t",

1595

1222

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

1596

1223

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

1597

1224

return

1598

if self.enabled:

1599

# Reschedule checker run

1600

gobject.source_remove(self.checker_initiator_tag)

1601

self.checker_initiator_tag = (gobject.timeout_add

1602

(value, self.start_checker))

1603

self.start_checker() # Start one now, too

1225

# Reschedule checker run

1226

gobject.source_remove(self.checker_initiator_tag)

1227

self.checker_initiator_tag = (gobject.timeout_add

1228

(value, self.start_checker))

1229

self.start_checker() # Start one now, too

1604

1230

1605

1231

# Checker - property

1606

1232

@dbus_service_property(_interface, signature="s",

1608

1234

def Checker_dbus_property(self, value=None):

1609

1235

if value is None: # get

1610

1236

return dbus.String(self.checker_command)

1611

self.checker_command = unicode(value)

1237

self.checker_command = value

1612

1238

1613

1239

# CheckerRunning - property

1614

1240

@dbus_service_property(_interface, signature="b",

1643

1269

raise KeyError()

1644

1270

1645

1271

def __getattribute__(self, name):

1646

if name == '_pipe':

1272

if(name == '_pipe'):

1647

1273

return super(ProxyClient, self).__getattribute__(name)

1648

1274

self._pipe.send(('getattr', name))

1649

1275

data = self._pipe.recv()

1656

1282

return func

1657

1283

1658

1284

def __setattr__(self, name, value):

1659

if name == '_pipe':

1285

if(name == '_pipe'):

1660

1286

return super(ProxyClient, self).__setattr__(name, value)

1661

1287

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

1662

1288

1289

class ClientDBusTransitional(ClientDBus):

1290

__metaclass__ = AlternateDBusNamesMetaclass

1663

1291

1664

1292

class ClientHandler(socketserver.BaseRequestHandler, object):

1665

1293

"""A class to handle client connections.

1748

1376

client.Rejected("Disabled")

1749

1377

return

1750

1378

1751

if client.approved or not client.approval_delay:

1379

if client._approved or not client.approval_delay:

1752

1380

#We are approved or approval is disabled

1753

1381

break

1754

elif client.approved is None:

1382

elif client._approved is None:

1755

1383

logger.info("Client %s needs approval",

1756

1384

client.name)

1757

1385

if self.server.use_dbus:

1770

1398

#wait until timeout or approved

1771

1399

time = datetime.datetime.now()

1772

1400

client.changedstate.acquire()

1773

client.changedstate.wait(

1774

float(timedelta_to_milliseconds(delay)

1775

/ 1000))

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1776

1404

client.changedstate.release()

1777

1405

time2 = datetime.datetime.now()

1778

1406

if (time2 - time) >= delay:

1794

1422

try:

1795

1423

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

1796

1424

except gnutls.errors.GNUTLSError as error:

1797

logger.warning("gnutls send failed",

1798

exc_info=error)

1425

logger.warning("gnutls send failed")

1799

1426

return

1800

1427

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

1801

1428

sent, len(client.secret)

1804

1431

1805

1432

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

1806

1433

# bump the timeout using extended_timeout

1807

client.bump_timeout(client.extended_timeout)

1434

client.checked_ok(client.extended_timeout)

1808

1435

if self.server.use_dbus:

1809

1436

# Emit D-Bus signal

1810

1437

client.GotSecret()

1815

1442

try:

1816

1443

session.bye()

1817

1444

except gnutls.errors.GNUTLSError as error:

1818

logger.warning("GnuTLS bye failed",

1819

exc_info=error)

1445

logger.warning("GnuTLS bye failed")

1820

1446

1821

1447

@staticmethod

1822

1448

def peer_certificate(session):

1878

1504

# Convert the buffer to a Python bytestring

1879

1505

fpr = ctypes.string_at(buf, buf_len.value)

1880

1506

# Convert the bytestring to hexadecimal notation

1881

hex_fpr = binascii.hexlify(fpr).upper()

1507

hex_fpr = ''.join("%02X" % ord(char) for char in fpr)

1882

1508

return hex_fpr

1883

1509

1884

1510

1887

1513

def sub_process_main(self, request, address):

1888

1514

try:

1889

1515

self.finish_request(request, address)

1890

except Exception:

1516

except:

1891

1517

self.handle_error(request, address)

1892

1518

self.close_request(request)

1893

1519

1894

1520

def process_request(self, request, address):

1895

1521

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

1896

1522

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

1897

args = (request, address))

1523

args = (request,

1524

address))

1898

1525

proc.start()

1899

1526

return proc

1900

1527

1928

1555

use_ipv6: Boolean; to use IPv6 or not

1929

1556

"""

1930

1557

def __init__(self, server_address, RequestHandlerClass,

1931

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

1932

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

1933

creating a new one with socket.socket().

1934

"""

1558

interface=None, use_ipv6=True):

1935

1559

self.interface = interface

1936

1560

if use_ipv6:

1937

1561

self.address_family = socket.AF_INET6

1938

if socketfd is not None:

1939

# Save the file descriptor

1940

self.socketfd = socketfd

1941

# Save the original socket.socket() function

1942

self.socket_socket = socket.socket

1943

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

1944

#

1945

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

1946

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

1947

# patching socket.socket.)

1948

#

1949

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

1950

@functools.wraps(socket.socket)

1951

def socket_wrapper(*args, **kwargs):

1952

# Restore original function so subsequent calls are

1953

# not affected.

1954

socket.socket = self.socket_socket

1955

del self.socket_socket

1956

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

1957

# saved file descriptor.

1958

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

1959

# Replace socket.socket() function with wrapper

1960

socket.socket = socket_wrapper

1961

# The socketserver.TCPServer.__init__ will call

1962

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

1963

# socket_wrapper(), if socketfd was set.

1964

1562

socketserver.TCPServer.__init__(self, server_address,

1965

1563

RequestHandlerClass)

1966

1967

1564

def server_bind(self):

1968

1565

"""This overrides the normal server_bind() function

1969

1566

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

1977

1574

try:

1978

1575

self.socket.setsockopt(socket.SOL_SOCKET,

1979

1576

SO_BINDTODEVICE,

1980

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

1577

str(self.interface

1578

+ '\0'))

1981

1579

except socket.error as error:

1982

if error.errno == errno.EPERM:

1983

logger.error("No permission to bind to"

1984

" interface %s", self.interface)

1985

elif error.errno == errno.ENOPROTOOPT:

1580

if error[0] == errno.EPERM:

1581

logger.error("No permission to"

1582

" bind to interface %s",

1583

self.interface)

1584

elif error[0] == errno.ENOPROTOOPT:

1986

1585

logger.error("SO_BINDTODEVICE not available;"

1987

1586

" cannot bind to interface %s",

1988

1587

self.interface)

1989

elif error.errno == errno.ENODEV:

1990

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

1991

" cannot bind", self.interface)

1992

1588

else:

1993

1589

raise

1994

1590

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

1997

1593

if self.address_family == socket.AF_INET6:

1998

1594

any_address = "::" # in6addr_any

1999

1595

else:

2000

any_address = "0.0.0.0" # INADDR_ANY

1596

any_address = socket.INADDR_ANY

2001

1597

self.server_address = (any_address,

2002

1598

self.server_address[1])

2003

1599

elif not self.server_address[1]:

2024

1620

"""

2025

1621

def __init__(self, server_address, RequestHandlerClass,

2026

1622

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

2027

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

1623

gnutls_priority=None, use_dbus=True):

2028

1624

self.enabled = False

2029

1625

self.clients = clients

2030

1626

if self.clients is None:

2031

self.clients = {}

1627

self.clients = set()

2032

1628

self.use_dbus = use_dbus

2033

1629

self.gnutls_priority = gnutls_priority

2034

1630

IPv6_TCPServer.__init__(self, server_address,

2035

1631

RequestHandlerClass,

2036

1632

interface = interface,

2037

use_ipv6 = use_ipv6,

2038

socketfd = socketfd)

1633

use_ipv6 = use_ipv6)

2039

1634

def server_activate(self):

2040

1635

if self.enabled:

2041

1636

return socketserver.TCPServer.server_activate(self)

2054

1649

2055

1650

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

2056

1651

proc = None, client_object=None):

1652

condition_names = {

1653

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

1654

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

1655

# blocking).

1656

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

1657

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

1658

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

1659

# broken, usually for pipes and

1660

# sockets).

1661

}

1662

conditions_string = ' | '.join(name

1663

for cond, name in

1664

condition_names.iteritems()

1665

if cond & condition)

2057

1666

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

2058

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

1667

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

2059

1668

# Wait for other process to exit

2060

1669

proc.join()

2061

1670

return False

2068

1677

fpr = request[1]

2069

1678

address = request[2]

2070

1679

2071

for c in self.clients.itervalues():

1680

for c in self.clients:

2072

1681

if c.fingerprint == fpr:

2073

1682

client = c

2074

1683

break

2119

1728

return True

2120

1729

2121

1730

2122

def rfc3339_duration_to_delta(duration):

2123

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

2124

2125

>>> rfc3339_duration_to_delta("P7D")

2126

datetime.timedelta(7)

2127

>>> rfc3339_duration_to_delta("PT60S")

2128

datetime.timedelta(0, 60)

2129

>>> rfc3339_duration_to_delta("PT60M")

2130

datetime.timedelta(0, 3600)

2131

>>> rfc3339_duration_to_delta("PT24H")

2132

datetime.timedelta(1)

2133

>>> rfc3339_duration_to_delta("P1W")

2134

datetime.timedelta(7)

2135

>>> rfc3339_duration_to_delta("PT5M30S")

2136

datetime.timedelta(0, 330)

2137

>>> rfc3339_duration_to_delta("P1DT3M20S")

2138

datetime.timedelta(1, 200)

2139

"""

2140

2141

# Parsing an RFC 3339 duration with regular expressions is not

2142

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

2143

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

2144

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

2145

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

2146

# avoid excessive use of external libraries.

2147

2148

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

2149

Token = collections.namedtuple("Token",

2150

("regexp", # To match token; if

2151

# "value" is not None,

2152

# must have a "group"

2153

# containing digits

2154

"value", # datetime.timedelta or

2155

# None

2156

"followers")) # Tokens valid after

2157

# this token

2158

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

2159

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

2160

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

2161

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

2162

datetime.timedelta(seconds=1),

2163

frozenset((token_end,)))

2164

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

2165

datetime.timedelta(minutes=1),

2166

frozenset((token_second, token_end)))

2167

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

2168

datetime.timedelta(hours=1),

2169

frozenset((token_minute, token_end)))

2170

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

2171

None,

2172

frozenset((token_hour, token_minute,

2173

token_second)))

2174

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

2175

datetime.timedelta(days=1),

2176

frozenset((token_time, token_end)))

2177

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

2178

datetime.timedelta(weeks=4),

2179

frozenset((token_day, token_end)))

2180

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

2181

datetime.timedelta(weeks=52),

2182

frozenset((token_month, token_end)))

2183

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

2184

datetime.timedelta(weeks=1),

2185

frozenset((token_end,)))

2186

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

2187

frozenset((token_year, token_month,

2188

token_day, token_time,

2189

token_week))),

2190

# Define starting values

2191

value = datetime.timedelta() # Value so far

2192

found_token = None

2193

followers = frozenset(token_duration,) # Following valid tokens

2194

s = duration # String left to parse

2195

# Loop until end token is found

2196

while found_token is not token_end:

2197

# Search for any currently valid tokens

2198

for token in followers:

2199

match = token.regexp.match(s)

2200

if match is not None:

2201

# Token found

2202

if token.value is not None:

2203

# Value found, parse digits

2204

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

2205

# Add to value so far

2206

value += factor * token.value

2207

# Strip token from string

2208

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

2209

# Go to found token

2210

found_token = token

2211

# Set valid next tokens

2212

followers = found_token.followers

2213

break

2214

else:

2215

# No currently valid tokens were found

2216

raise ValueError("Invalid RFC 3339 duration")

2217

# End token found

2218

return value

2219

2220

2221

1731

def string_to_delta(interval):

2222

1732

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

2223

1733

2234

1744

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

2235

1745

datetime.timedelta(0, 330)

2236

1746

"""

2237

2238

try:

2239

return rfc3339_duration_to_delta(interval)

2240

except ValueError:

2241

pass

2242

2243

1747

timevalue = datetime.timedelta(0)

2244

1748

for s in interval.split():

2245

1749

try:

2256

1760

elif suffix == "w":

2257

1761

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

2258

1762

else:

2259

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

2260

.format(suffix))

1763

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

2261

1764

except (ValueError, IndexError) as e:

2262

1765

raise ValueError(*(e.args))

2263

1766

timevalue += delta

2264

1767

return timevalue

2265

1768

2266

1769

1770

def if_nametoindex(interface):

1771

"""Call the C function if_nametoindex(), or equivalent

1772

1773

Note: This function cannot accept a unicode string."""

1774

global if_nametoindex

1775

try:

1776

if_nametoindex = (ctypes.cdll.LoadLibrary

1777

(ctypes.util.find_library("c"))

1778

.if_nametoindex)

1779

except (OSError, AttributeError):

1780

logger.warning("Doing if_nametoindex the hard way")

1781

def if_nametoindex(interface):

1782

"Get an interface index the hard way, i.e. using fcntl()"

1783

SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

1784

with contextlib.closing(socket.socket()) as s:

1785

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1786

struct.pack(str("16s16x"),

1787

interface))

1788

interface_index = struct.unpack(str("I"),

1789

ifreq[16:20])[0]

1790

return interface_index

1791

return if_nametoindex(interface)

1792

1793

2267

1794

def daemon(nochdir = False, noclose = False):

2268

1795

"""See daemon(3). Standard BSD Unix function.

2269

1796

2277

1804

sys.exit()

2278

1805

if not noclose:

2279

1806

# Close all standard open file descriptors

2280

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

1807

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

2281

1808

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

2282

1809

raise OSError(errno.ENODEV,

2283

"{0} not a character device"

2284

.format(os.devnull))

1810

"%s not a character device"

1811

% os.path.devnull)

2285

1812

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

2286

1813

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

2287

1814

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

2296

1823

2297

1824

parser = argparse.ArgumentParser()

2298

1825

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

2299

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

1826

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

2300

1827

help="show version number and exit")

2301

1828

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

2302

1829

help="Bind to interface IF")

2308

1835

help="Run self-test")

2309

1836

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

2310

1837

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

2311

" to terminal", default=None)

1838

" to terminal")

2312

1839

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

2313

1840

help="Debug level for stdout output")

2314

1841

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

2321

1848

" files")

2322

1849

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

2323

1850

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

2324

" system bus interface", default=None)

1851

" system bus interface")

2325

1852

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

2326

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

2327

default=None)

2328

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

2329

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

2330

" state", default=None)

2331

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

2332

help="Specify a file descriptor to a network"

2333

" socket to use instead of creating one")

2334

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

2335

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

2336

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

2337

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

2338

1853

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

2339

1854

options = parser.parse_args()

2340

1855

2341

1856

if options.check:

2349

1864

"port": "",

2350

1865

"debug": "False",

2351

1866

"priority":

2352

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

1867

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

2353

1868

"servicename": "Mandos",

2354

1869

"use_dbus": "True",

2355

1870

"use_ipv6": "True",

2356

1871

"debuglevel": "",

2357

"restore": "True",

2358

"socket": "",

2359

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

2360

"foreground": "False",

2361

1872

}

2362

1873

2363

1874

# Parse config file for server-global settings

2368

1879

# Convert the SafeConfigParser object to a dict

2369

1880

server_settings = server_config.defaults()

2370

1881

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

2371

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

1882

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

2372

1883

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

2373

1884

option)

2374

1885

if server_settings["port"]:

2375

1886

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

2376

1887

"port")

2377

if server_settings["socket"]:

2378

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

2379

"socket")

2380

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

2381

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

2382

# happen with a supplied network socket.

2383

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

2384

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

2385

["socket"])

2386

1888

del server_config

2387

1889

2388

1890

# Override the settings from the config file with command line

2389

1891

# options, if set.

2390

1892

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

2391

1893

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

2392

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

2393

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

1894

"use_dbus", "use_ipv6", "debuglevel"):

2394

1895

value = getattr(options, option)

2395

1896

if value is not None:

2396

1897

server_settings[option] = value

2399

1900

for option in server_settings.keys():

2400

1901

if type(server_settings[option]) is str:

2401

1902

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

2402

# Force all boolean options to be boolean

2403

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

2404

"foreground"):

2405

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

2406

# Debug implies foreground

2407

if server_settings["debug"]:

2408

server_settings["foreground"] = True

2409

1903

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

2410

1904

2411

1905

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

2415

1909

debuglevel = server_settings["debuglevel"]

2416

1910

use_dbus = server_settings["use_dbus"]

2417

1911

use_ipv6 = server_settings["use_ipv6"]

2418

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

2419

stored_state_file)

2420

foreground = server_settings["foreground"]

2421

2422

if debug:

2423

initlogger(debug, logging.DEBUG)

2424

else:

2425

if not debuglevel:

2426

initlogger(debug)

2427

else:

2428

level = getattr(logging, debuglevel.upper())

2429

initlogger(debug, level)

2430

1912

2431

1913

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

2432

1914

syslogger.setFormatter(logging.Formatter

2433

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

2434

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

2435

.format(server_settings

2436

["servicename"])))

1915

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

1916

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

1917

% server_settings["servicename"]))

2437

1918

2438

1919

# Parse config file with clients

2439

client_config = configparser.SafeConfigParser(Client

2440

.client_defaults)

1920

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

1921

"extended_timeout": "15m",

1922

"interval": "2m",

1923

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

1924

"host": "",

1925

"approval_delay": "0s",

1926

"approval_duration": "1s",

1927

}

1928

client_config = configparser.SafeConfigParser(client_defaults)

2441

1929

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

2442

1930

"clients.conf"))

2443

1931

2452

1940

use_ipv6=use_ipv6,

2453

1941

gnutls_priority=

2454

1942

server_settings["priority"],

2455

use_dbus=use_dbus,

2456

socketfd=(server_settings["socket"]

2457

or None))

2458

if not foreground:

2459

pidfilename = "/run/mandos.pid"

2460

pidfile = None

1943

use_dbus=use_dbus)

1944

if not debug:

1945

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

2461

1946

try:

2462

1947

pidfile = open(pidfilename, "w")

2463

except IOError as e:

2464

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

2465

exc_info=e)

1948

except IOError:

1949

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

2466

1950

2467

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

1951

try:

1952

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

1953

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

1954

except KeyError:

2468

1955

try:

2469

uid = pwd.getpwnam(name).pw_uid

2470

gid = pwd.getpwnam(name).pw_gid

2471

break

1956

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

1957

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

2472

1958

except KeyError:

2473

continue

2474

else:

2475

uid = 65534

2476

gid = 65534

1959

try:

1960

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

1961

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

1962

except KeyError:

1963

uid = 65534

1964

gid = 65534

2477

1965

try:

2478

1966

os.setgid(gid)

2479

1967

os.setuid(uid)

2480

1968

except OSError as error:

2481

if error.errno != errno.EPERM:

1969

if error[0] != errno.EPERM:

2482

1970

raise error

2483

1971

1972

if not debug and not debuglevel:

1973

syslogger.setLevel(logging.WARNING)

1974

console.setLevel(logging.WARNING)

1975

if debuglevel:

1976

level = getattr(logging, debuglevel.upper())

1977

syslogger.setLevel(level)

1978

console.setLevel(level)

1979

2484

1980

if debug:

2485

1981

# Enable all possible GnuTLS debugging

2486

1982

2496

1992

.gnutls_global_set_log_function(debug_gnutls))

2497

1993

2498

1994

# Redirect stdin so all checkers get /dev/null

2499

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

1995

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

2500

1996

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

2501

1997

if null > 2:

2502

1998

os.close(null)

1999

else:

2000

# No console logging

2001

logger.removeHandler(console)

2503

2002

2504

2003

# Need to fork before connecting to D-Bus

2505

if not foreground:

2004

if not debug:

2506

2005

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

2507

2006

daemon()

2508

2007

2509

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

2510

# need to inform gobject that threads will be used.

2511

gobject.threads_init()

2512

2513

2008

global main_loop

2514

2009

# From the Avahi example code

2515

DBusGMainLoop(set_as_default=True)

2010

DBusGMainLoop(set_as_default=True )

2516

2011

main_loop = gobject.MainLoop()

2517

2012

bus = dbus.SystemBus()

2518

2013

# End of Avahi example code

2524

2019

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

2525

2020

do_not_queue=True))

2526

2021

except dbus.exceptions.NameExistsException as e:

2527

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

2022

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

2528

2023

use_dbus = False

2529

2024

server_settings["use_dbus"] = False

2530

2025

tcp_server.use_dbus = False

2531

2026

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2532

service = AvahiServiceToSyslog(name =

2533

server_settings["servicename"],

2534

servicetype = "_mandos._tcp",

2535

protocol = protocol, bus = bus)

2027

service = AvahiService(name = server_settings["servicename"],

2028

servicetype = "_mandos._tcp",

2029

protocol = protocol, bus = bus)

2536

2030

if server_settings["interface"]:

2537

2031

service.interface = (if_nametoindex

2538

2032

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

2542

2036

2543

2037

client_class = Client

2544

2038

if use_dbus:

2545

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

2546

2547

client_settings = Client.config_parser(client_config)

2548

old_client_settings = {}

2549

clients_data = {}

2550

2551

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

2552

global wnull

2553

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

2554

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

2555

# mode

2556

if debug or not foreground:

2557

wnull.close()

2558

2559

# Get client data and settings from last running state.

2560

if server_settings["restore"]:

2561

try:

2562

with open(stored_state_path, "rb") as stored_state:

2563

clients_data, old_client_settings = (pickle.load

2564

(stored_state))

2565

os.remove(stored_state_path)

2566

except IOError as e:

2567

if e.errno == errno.ENOENT:

2568

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

2569

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

2570

else:

2571

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

2572

exc_info=e)

2573

raise

2574

except EOFError as e:

2575

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

2576

"EOFError:", exc_info=e)

2577

2578

with PGPEngine() as pgp:

2579

for client_name, client in clients_data.iteritems():

2580

# Skip removed clients

2581

if client_name not in client_settings:

2582

continue

2583

2584

# Decide which value to use after restoring saved state.

2585

# We have three different values: Old config file,

2586

# new config file, and saved state.

2587

# New config value takes precedence if it differs from old

2588

# config value, otherwise use saved state.

2589

for name, value in client_settings[client_name].items():

2590

try:

2591

# For each value in new config, check if it

2592

# differs from the old config value (Except for

2593

# the "secret" attribute)

2594

if (name != "secret" and

2595

value != old_client_settings[client_name]

2596

[name]):

2597

client[name] = value

2598

except KeyError:

2599

pass

2600

2601

# Clients who has passed its expire date can still be

2602

# enabled if its last checker was successful. Clients

2603

# whose checker succeeded before we stored its state is

2604

# assumed to have successfully run all checkers during

2605

# downtime.

2606

if client["enabled"]:

2607

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

2608

if not client["last_checked_ok"]:

2609

logger.warning(

2610

"disabling client {0} - Client never "

2611

"performed a successful checker"

2612

.format(client_name))

2613

client["enabled"] = False

2614

elif client["last_checker_status"] != 0:

2615

logger.warning(

2616

"disabling client {0} - Client "

2617

"last checker failed with error code {1}"

2618

.format(client_name,

2619

client["last_checker_status"]))

2620

client["enabled"] = False

2621

else:

2622

client["expires"] = (datetime.datetime

2623

.utcnow()

2624

+ client["timeout"])

2625

logger.debug("Last checker succeeded,"

2626

" keeping {0} enabled"

2627

.format(client_name))

2039

client_class = functools.partial(ClientDBusTransitional,

2040

bus = bus)

2041

def client_config_items(config, section):

2042

special_settings = {

2043

"approved_by_default":

2044

lambda: config.getboolean(section,

2045

"approved_by_default"),

2046

}

2047

for name, value in config.items(section):

2628

2048

try:

2629

client["secret"] = (

2630

pgp.decrypt(client["encrypted_secret"],

2631

client_settings[client_name]

2632

["secret"]))

2633

except PGPError:

2634

# If decryption fails, we use secret from new settings

2635

logger.debug("Failed to decrypt {0} old secret"

2636

.format(client_name))

2637

client["secret"] = (

2638

client_settings[client_name]["secret"])

2639

2640

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

2641

for client_name in (set(old_client_settings)

2642

- set(client_settings)):

2643

del clients_data[client_name]

2644

for client_name in (set(client_settings)

2645

- set(old_client_settings)):

2646

clients_data[client_name] = client_settings[client_name]

2647

2648

# Create all client objects

2649

for client_name, client in clients_data.iteritems():

2650

tcp_server.clients[client_name] = client_class(

2651

name = client_name, settings = client,

2652

server_settings = server_settings)

2653

2049

yield (name, special_settings[name]())

2050

except KeyError:

2051

yield (name, value)

2052

2053

tcp_server.clients.update(set(

2054

client_class(name = section,

2055

config= dict(client_config_items(

2056

client_config, section)))

2057

for section in client_config.sections()))

2654

2058

if not tcp_server.clients:

2655

2059

logger.warning("No clients defined")

2656

2657

if not foreground:

2658

if pidfile is not None:

2659

try:

2660

with pidfile:

2661

pid = os.getpid()

2662

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

2663

except IOError:

2664

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

2665

pidfilename, pid)

2666

del pidfile

2060

2061

if not debug:

2062

try:

2063

with pidfile:

2064

pid = os.getpid()

2065

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

2066

del pidfile

2067

except IOError:

2068

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

2069

pidfilename, pid)

2070

except NameError:

2071

# "pidfile" was never created

2072

pass

2667

2073

del pidfilename

2074

2075

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

2668

2076

2669

2077

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

2670

2078

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

2671

2079

2672

2080

if use_dbus:

2673

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

2674

"se.bsnet.fukt.Mandos"})

2675

class MandosDBusService(DBusObjectWithProperties):

2081

class MandosDBusService(dbus.service.Object):

2676

2082

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

2677

2083

def __init__(self):

2678

2084

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

2679

2085

_interface = "se.recompile.Mandos"

2680

2086

2681

@dbus_interface_annotations(_interface)

2682

def _foo(self):

2683

return { "org.freedesktop.DBus.Property"

2684

".EmitsChangedSignal":

2685

"false"}

2686

2687

2087

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

2688

2088

def ClientAdded(self, objpath):

2689

2089

"D-Bus signal"

2703

2103

def GetAllClients(self):

2704

2104

"D-Bus method"

2705

2105

return dbus.Array(c.dbus_object_path

2706

for c in

2707

tcp_server.clients.itervalues())

2106

for c in tcp_server.clients)

2708

2107

2709

2108

@dbus.service.method(_interface,

2710

2109

out_signature="a{oa{sv}}")

2712

2111

"D-Bus method"

2713

2112

return dbus.Dictionary(

2714

2113

((c.dbus_object_path, c.GetAll(""))

2715

for c in tcp_server.clients.itervalues()),

2114

for c in tcp_server.clients),

2716

2115

signature="oa{sv}")

2717

2116

2718

2117

@dbus.service.method(_interface, in_signature="o")

2719

2118

def RemoveClient(self, object_path):

2720

2119

"D-Bus method"

2721

for c in tcp_server.clients.itervalues():

2120

for c in tcp_server.clients:

2722

2121

if c.dbus_object_path == object_path:

2723

del tcp_server.clients[c.name]

2122

tcp_server.clients.remove(c)

2724

2123

c.remove_from_connection()

2725

2124

# Don't signal anything except ClientRemoved

2726

2125

c.disable(quiet=True)

2731

2130

2732

2131

del _interface

2733

2132

2734

mandos_dbus_service = MandosDBusService()

2133

class MandosDBusServiceTransitional(MandosDBusService):

2134

__metaclass__ = AlternateDBusNamesMetaclass

2135

mandos_dbus_service = MandosDBusServiceTransitional()

2735

2136

2736

2137

def cleanup():

2737

2138

"Cleanup function; run on exit"

2738

2139

service.cleanup()

2739

2140

2740

2141

multiprocessing.active_children()

2741

wnull.close()

2742

if not (tcp_server.clients or client_settings):

2743

return

2744

2745

# Store client before exiting. Secrets are encrypted with key

2746

# based on what config file has. If config file is

2747

# removed/edited, old secret will thus be unrecovable.

2748

clients = {}

2749

with PGPEngine() as pgp:

2750

for client in tcp_server.clients.itervalues():

2751

key = client_settings[client.name]["secret"]

2752

client.encrypted_secret = pgp.encrypt(client.secret,

2753

key)

2754

client_dict = {}

2755

2756

# A list of attributes that can not be pickled

2757

# + secret.

2758

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

2759

"checker", "server_settings"))

2760

for name, typ in (inspect.getmembers

2761

(dbus.service.Object)):

2762

exclude.add(name)

2763

2764

client_dict["encrypted_secret"] = (client

2765

.encrypted_secret)

2766

for attr in client.client_structure:

2767

if attr not in exclude:

2768

client_dict[attr] = getattr(client, attr)

2769

2770

clients[client.name] = client_dict

2771

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

2772

2773

try:

2774

with (tempfile.NamedTemporaryFile

2775

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

2776

dir=os.path.dirname(stored_state_path),

2777

delete=False)) as stored_state:

2778

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

2779

tempname=stored_state.name

2780

os.rename(tempname, stored_state_path)

2781

except (IOError, OSError) as e:

2782

if not debug:

2783

try:

2784

os.remove(tempname)

2785

except NameError:

2786

pass

2787

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

2788

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

2789

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

2790

else:

2791

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

2792

exc_info=e)

2793

raise e

2794

2795

# Delete all clients, and settings from config

2796

2142

while tcp_server.clients:

2797

name, client = tcp_server.clients.popitem()

2143

client = tcp_server.clients.pop()

2798

2144

if use_dbus:

2799

2145

client.remove_from_connection()

2146

client.disable_hook = None

2800

2147

# Don't signal anything except ClientRemoved

2801

2148

client.disable(quiet=True)

2802

2149

if use_dbus:

2804

2151

mandos_dbus_service.ClientRemoved(client

2805

2152

.dbus_object_path,

2806

2153

client.name)

2807

client_settings.clear()

2808

2154

2809

2155

atexit.register(cleanup)

2810

2156

2811

for client in tcp_server.clients.itervalues():

2157

for client in tcp_server.clients:

2812

2158

if use_dbus:

2813

2159

# Emit D-Bus signal

2814

2160

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2815

# Need to initiate checking of clients

2816

if client.enabled:

2817

client.init_checker()

2161

client.enable()

2818

2162

2819

2163

tcp_server.enable()

2820

2164

tcp_server.server_activate()

2823

2167

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

2824

2168

if use_ipv6:

2825

2169

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

2826

" flowinfo %d, scope_id %d",

2827

*tcp_server.socket.getsockname())

2170

" flowinfo %d, scope_id %d"

2171

% tcp_server.socket.getsockname())

2828

2172

else: # IPv4

2829

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

2830

*tcp_server.socket.getsockname())

2173

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

2174

% tcp_server.socket.getsockname())

2831

2175

2832

2176

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

2833

2177

2836

2180

try:

2837

2181

service.activate()

2838

2182

except dbus.exceptions.DBusException as error:

2839

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

2183

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

2840

2184

cleanup()

2841

2185

sys.exit(1)

2842

2186

# End of Avahi example code

2849

2193

logger.debug("Starting main loop")

2850

2194

main_loop.run()

2851

2195

except AvahiError as error:

2852

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

2196

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

2853

2197

cleanup()

2854

2198

sys.exit(1)

2855

2199

except KeyboardInterrupt:

2860

2204

# Must run before the D-Bus bus name gets deregistered

2861

2205

cleanup()

2862

2206

2207

2863

2208

if __name__ == '__main__':

2864

2209

main()