/mandos/trunk : revision 505.1.4

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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 = "1.3.1"

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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

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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if config is None:

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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"])

367

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

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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(

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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,

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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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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

589

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return

399

self.send_changedstate()

400

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

401

# and every interval from then on.

402

self.checker_initiator_tag = (gobject.timeout_add

403

(self.interval_milliseconds(),

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self.start_checker))

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

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

407

self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

593

self.init_checker()

594

self.send_changedstate()

412

# Also start a new checker *right now*.

413

self.start_checker()

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def disable(self, quiet=True):

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"""Disable this client."""

598

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

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return False

600

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if not quiet:

420

self.send_changedstate()

421

if not quiet:

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

602

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

423

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

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

606

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

427

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

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = None

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self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

610

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self.enabled = False

611

if not quiet:

612

self.send_changedstate()

613

434

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

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return False

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def __del__(self):

438

self.disable_hook = None

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self.disable()

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def init_checker(self):

620

# 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:

623

gobject.source_remove(self.checker_initiator_tag)

624

self.checker_initiator_tag = (gobject.timeout_add

625

(self.interval_milliseconds(),

626

self.start_checker))

627

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

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

630

self.disable_initiator_tag = (gobject.timeout_add

631

(self.timeout_milliseconds(),

632

self.disable))

633

# Also start a new checker *right now*.

634

self.start_checker()

635

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

664

if self.disable_initiator_tag is not None:

665

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

667

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

668

self.disable_initiator_tag = (gobject.timeout_add

669

(timedelta_to_milliseconds

670

(timeout), self.disable))

671

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

466

self.last_checked_ok = datetime.datetime.utcnow()

467

gobject.source_remove(self.disable_initiator_tag)

468

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

469

self.disable_initiator_tag = (gobject.timeout_add

470

(_timedelta_to_milliseconds

471

(timeout), self.disable))

672

472

673

473

def need_approval(self):

674

474

self.last_approval_request = datetime.datetime.utcnow()

679

479

If a checker already exists, leave it running and do

680

480

nothing."""

681

481

# 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

482

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

483

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

484

# client would inevitably timeout, since no checker would get

485

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

686

486

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

687

487

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

688

488

# should be.

702

502

self.current_checker_command)

703

503

# Start a new checker if needed

704

504

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

505

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

506

# In case checker_command has exactly one % operator

507

command = self.checker_command % self.host

508

except TypeError:

509

# Escape attributes for the shell

510

escaped_attrs = dict(

511

(attr,

512

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

513

errors=

514

'replace')))

515

for attr in

516

self.runtime_expansions)

517

518

try:

519

command = self.checker_command % escaped_attrs

520

except TypeError as error:

521

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

522

' %s', self.checker_command, error)

523

return True # Try again later

716

524

self.current_checker_command = command

717

525

try:

718

526

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

721

529

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

722

530

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

723

531

# 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

532

self.checker = subprocess.Popen(command,

733

533

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:

534

shell=True, cwd="/")

535

self.checker_callback_tag = (gobject.child_watch_add

536

(self.checker.pid,

537

self.checker_callback,

538

data=command))

539

# The checker may have completed before the gobject

540

# watch was added. Check for this.

747

541

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

542

if pid:

543

gobject.source_remove(self.checker_callback_tag)

544

self.checker_callback(pid, status, command)

748

545

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)

546

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

547

error)

758

548

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

759

549

return True

760

550

767

557

return

768

558

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

769

559

try:

770

self.checker.terminate()

560

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

771

561

#time.sleep(0.5)

772

562

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

773

# self.checker.kill()

563

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

774

564

except OSError as error:

775

565

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

776

566

raise

793

583

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

794

584

if byte_arrays and signature != "ay":

795

585

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

796

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

586

" signature %r" % signature)

797

587

def decorator(func):

798

588

func._dbus_is_property = True

799

589

func._dbus_interface = dbus_interface

807

597

return decorator

808

598

809

599

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

600

class DBusPropertyException(dbus.exceptions.DBusException):

848

601

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

849

602

"""

872

625

"""

873

626

874

627

@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)

628

def _is_dbus_property(obj):

629

return getattr(obj, "_dbus_is_property", False)

883

630

884

def _get_all_dbus_things(self, thing):

631

def _get_all_dbus_properties(self):

885

632

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

886

633

"""

887

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

888

name),

889

athing.__get__(self))

634

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

890

635

for cls in self.__class__.__mro__

891

for name, athing in

892

inspect.getmembers(cls,

893

self._is_dbus_thing(thing)))

636

for name, prop in

637

inspect.getmembers(cls, self._is_dbus_property))

894

638

895

639

def _get_dbus_property(self, interface_name, property_name):

896

640

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

898

642

"""

899

643

for cls in self.__class__.__mro__:

900

644

for name, value in (inspect.getmembers

901

(cls,

902

self._is_dbus_thing("property"))):

645

(cls, self._is_dbus_property)):

903

646

if (value._dbus_name == property_name

904

647

and value._dbus_interface == interface_name):

905

648

return value.__get__(self)

934

677

# signatures other than "ay".

935

678

if prop._dbus_signature != "ay":

936

679

raise ValueError

937

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

938

for byte in value))

680

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

681

for byte in value))

939

682

prop(value)

940

683

941

684

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

946

689

947

690

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

948

691

"""

949

properties = {}

950

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

692

all = {}

693

for name, prop in self._get_all_dbus_properties():

951

694

if (interface_name

952

695

and interface_name != prop._dbus_interface):

953

696

# Interface non-empty but did not match

957

700

continue

958

701

value = prop()

959

702

if not hasattr(value, "variant_level"):

960

properties[name] = value

703

all[name] = value

961

704

continue

962

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

963

value.variant_level+1)

964

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

705

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

706

value.variant_level+1)

707

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

965

708

966

709

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

967

710

out_signature="s",

968

711

path_keyword='object_path',

969

712

connection_keyword='connection')

970

713

def Introspect(self, object_path, connection):

971

"""Overloading of standard D-Bus method.

972

973

Inserts property tags and interface annotation tags.

714

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

974

715

"""

975

716

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

976

717

connection)

983

724

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

984

725

return e

985

726

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

986

# Add property tags

987

727

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

988

728

for name, prop

989

in self._get_all_dbus_things("property")

729

in self._get_all_dbus_properties()

990

730

if prop._dbus_interface

991

731

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

992

732

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

733

# Add the names to the return values for the

1025

734

# "org.freedesktop.DBus.Properties" methods

1026

735

if (if_tag.getAttribute("name")

1041

750

except (AttributeError, xml.dom.DOMException,

1042

751

xml.parsers.expat.ExpatError) as error:

1043

752

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

1044

exc_info=error)

753

error)

1045

754

return xmlstring

1046

755

1047

756

1048

def datetime_to_dbus(dt, variant_level=0):

757

def datetime_to_dbus (dt, variant_level=0):

1049

758

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

1050

759

if dt is None:

1051

760

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

1052

761

return dbus.String(dt.isoformat(),

1053

762

variant_level=variant_level)

1054

763

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).

764

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

765

.__metaclass__):

766

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

767

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

1078

768

"""

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):

769

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

770

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

771

# methods, signals, or properties in them

772

for base in (b for b in bases

773

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

774

# Go though all attributes of the base class

775

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

1086

776

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

1087

777

# with the wrong interface name

1088

778

if (not hasattr(attribute, "_dbus_interface")

1089

779

or not attribute._dbus_interface

1090

.startswith(orig_interface_name)):

780

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

1091

781

continue

1092

782

# Create an alternate D-Bus interface name based on

1093

783

# the current name

1094

784

alt_interface = (attribute._dbus_interface

1095

.replace(orig_interface_name,

1096

alt_interface_name))

1097

interface_names.add(alt_interface)

785

.replace("se.recompile.Mandos",

786

"se.bsnet.fukt.Mandos"))

1098

787

# Is this a D-Bus signal?

1099

788

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

1100

# Extract the original non-method undecorated

1101

# function by black magic

789

# Extract the original non-method function by

790

# black magic

1102

791

nonmethod_func = (dict(

1103

792

zip(attribute.func_code.co_freevars,

1104

793

attribute.__closure__))["func"]

1115

804

nonmethod_func.func_name,

1116

805

nonmethod_func.func_defaults,

1117

806

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

807

# 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

808

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

809

# signals gets sent when the function is called

1128

810

def fixscope(func1, func2):

1129

811

"""This function is a scope container to pass

1130

812

func1 and func2 to the "call_both" function

1137

819

return call_both

1138

820

# Create the "call_both" function and add it to

1139

821

# the class

1140

attr[attrname] = fixscope(attribute, new_function)

822

attr[attrname] = fixscope(attribute,

823

new_function)

1141

824

# Is this a D-Bus method?

1142

825

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

1143

826

# Create a new, but exactly alike, function

1154

837

attribute.func_name,

1155

838

attribute.func_defaults,

1156

839

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

840

# Is this a D-Bus property?

1164

841

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

1165

842

# Create a new, but exactly alike, function

1179

856

attribute.func_name,

1180

857

attribute.func_defaults,

1181

858

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"})

859

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

860

1227

861

class ClientDBus(Client, DBusObjectWithProperties):

1228

862

"""A Client class using D-Bus

1229

863

1238

872

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

1239

873

1240

874

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

875

self._approvals_pending = 0

1241

876

self.bus = bus

1242

877

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

1243

878

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

1249

884

("/clients/" + client_object_name))

1250

885

DBusObjectWithProperties.__init__(self, self.bus,

1251

886

self.dbus_object_path)

1252

887

1253

888

def notifychangeproperty(transform_func,

1254

889

dbus_name, type_func=lambda x: x,

1255

890

variant_level=1):

1256

891

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

1257

892

its changes to DBus.

1258

1259

transform_fun: Function that takes a value and a variant_level

1260

and transforms it to a D-Bus type.

893

894

transform_fun: Function that takes a value and transforms it

895

to a D-Bus type.

1261

896

dbus_name: D-Bus name of the variable

1262

897

type_func: Function that transform the value before sending it

1263

898

to the D-Bus. Default: no transform

1264

899

variant_level: D-Bus variant level. Default: 1

1265

900

"""

1266

attrname = "_{0}".format(dbus_name)

901

real_value = [None,]

1267

902

def setter(self, value):

903

old_value = real_value[0]

904

real_value[0] = value

1268

905

if hasattr(self, "dbus_object_path"):

1269

if (not hasattr(self, attrname) or

1270

type_func(getattr(self, attrname, None))

1271

!= type_func(value)):

1272

dbus_value = transform_func(type_func(value),

1273

variant_level

1274

=variant_level)

906

if type_func(old_value) != type_func(real_value[0]):

907

dbus_value = transform_func(type_func

908

(real_value[0]),

909

variant_level)

1275

910

self.PropertyChanged(dbus.String(dbus_name),

1276

911

dbus_value)

1277

setattr(self, attrname, value)

1278

912

1279

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

913

return property(lambda self: real_value[0], setter)

914

1280

915

1281

916

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1282

917

approvals_pending = notifychangeproperty(dbus.Boolean,

1290

925

checker is not None)

1291

926

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1292

927

"LastCheckedOK")

1293

last_checker_status = notifychangeproperty(dbus.Int16,

1294

"LastCheckerStatus")

1295

928

last_approval_request = notifychangeproperty(

1296

929

datetime_to_dbus, "LastApprovalRequest")

1297

930

approved_by_default = notifychangeproperty(dbus.Boolean,

1298

931

"ApprovedByDefault")

1299

approval_delay = notifychangeproperty(dbus.UInt64,

932

approval_delay = notifychangeproperty(dbus.UInt16,

1300

933

"ApprovalDelay",

1301

934

type_func =

1302

timedelta_to_milliseconds)

935

_timedelta_to_milliseconds)

1303

936

approval_duration = notifychangeproperty(

1304

dbus.UInt64, "ApprovalDuration",

1305

type_func = timedelta_to_milliseconds)

937

dbus.UInt16, "ApprovalDuration",

938

type_func = _timedelta_to_milliseconds)

1306

939

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

1307

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

940

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

1308

941

type_func =

1309

timedelta_to_milliseconds)

942

_timedelta_to_milliseconds)

1310

943

extended_timeout = notifychangeproperty(

1311

dbus.UInt64, "ExtendedTimeout",

1312

type_func = timedelta_to_milliseconds)

1313

interval = notifychangeproperty(dbus.UInt64,

944

dbus.UInt16, "ExtendedTimeout",

945

type_func = _timedelta_to_milliseconds)

946

interval = notifychangeproperty(dbus.UInt16,

1314

947

"Interval",

1315

948

type_func =

1316

timedelta_to_milliseconds)

949

_timedelta_to_milliseconds)

1317

950

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

1318

951

1319

952

del notifychangeproperty

1361

994

return r

1362

995

1363

996

def _reset_approved(self):

1364

self.approved = None

997

self._approved = None

1365

998

return False

1366

999

1367

1000

def approve(self, value=True):

1368

self.approved = value

1369

gobject.timeout_add(timedelta_to_milliseconds

1001

self.send_changedstate()

1002

self._approved = value

1003

gobject.timeout_add(_timedelta_to_milliseconds

1370

1004

(self.approval_duration),

1371

1005

self._reset_approved)

1372

self.send_changedstate()

1006

1373

1007

1374

1008

## D-Bus methods, signals & properties

1375

1009

_interface = "se.recompile.Mandos.Client"

1376

1010

1377

## Interfaces

1378

1379

@dbus_interface_annotations(_interface)

1380

def _foo(self):

1381

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

1382

"false"}

1383

1384

1011

## Signals

1385

1012

1386

1013

# CheckerCompleted - signal

1485

1112

access="readwrite")

1486

1113

def ApprovalDuration_dbus_property(self, value=None):

1487

1114

if value is None: # get

1488

return dbus.UInt64(timedelta_to_milliseconds(

1115

return dbus.UInt64(_timedelta_to_milliseconds(

1489

1116

self.approval_duration))

1490

1117

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

1491

1118

1505

1132

def Host_dbus_property(self, value=None):

1506

1133

if value is None: # get

1507

1134

return dbus.String(self.host)

1508

self.host = unicode(value)

1135

self.host = value

1509

1136

1510

1137

# Created - property

1511

1138

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

1512

1139

def Created_dbus_property(self):

1513

return datetime_to_dbus(self.created)

1140

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

1514

1141

1515

1142

# LastEnabled - property

1516

1143

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

1537

1164

return

1538

1165

return datetime_to_dbus(self.last_checked_ok)

1539

1166

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

1167

# Expires - property

1547

1168

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

1548

1169

def Expires_dbus_property(self):

1559

1180

def Timeout_dbus_property(self, value=None):

1560

1181

if value is None: # get

1561

1182

return dbus.UInt64(self.timeout_milliseconds())

1562

old_timeout = self.timeout

1563

1183

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))

1184

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

1185

return

1186

# Reschedule timeout

1187

gobject.source_remove(self.disable_initiator_tag)

1188

self.disable_initiator_tag = None

1189

self.expires = None

1190

time_to_die = (self.

1191

_timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow()))

1196

if time_to_die <= 0:

1197

# The timeout has passed

1198

self.disable()

1199

else:

1200

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

1201

+ datetime.timedelta(milliseconds =

1202

time_to_die))

1203

self.disable_initiator_tag = (gobject.timeout_add

1204

(time_to_die, self.disable))

1580

1205

1581

1206

# ExtendedTimeout - property

1582

1207

@dbus_service_property(_interface, signature="t",

1595

1220

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

1596

1221

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

1597

1222

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

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

1604

1228

1605

1229

# Checker - property

1606

1230

@dbus_service_property(_interface, signature="s",

1608

1232

def Checker_dbus_property(self, value=None):

1609

1233

if value is None: # get

1610

1234

return dbus.String(self.checker_command)

1611

self.checker_command = unicode(value)

1235

self.checker_command = value

1612

1236

1613

1237

# CheckerRunning - property

1614

1238

@dbus_service_property(_interface, signature="b",

1643

1267

raise KeyError()

1644

1268

1645

1269

def __getattribute__(self, name):

1646

if name == '_pipe':

1270

if(name == '_pipe'):

1647

1271

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

1648

1272

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

1649

1273

data = self._pipe.recv()

1656

1280

return func

1657

1281

1658

1282

def __setattr__(self, name, value):

1659

if name == '_pipe':

1283

if(name == '_pipe'):

1660

1284

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

1661

1285

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

1662

1286

1287

class ClientDBusTransitional(ClientDBus):

1288

__metaclass__ = AlternateDBusNamesMetaclass

1663

1289

1664

1290

class ClientHandler(socketserver.BaseRequestHandler, object):

1665

1291

"""A class to handle client connections.

1748

1374

client.Rejected("Disabled")

1749

1375

return

1750

1376

1751

if client.approved or not client.approval_delay:

1377

if client._approved or not client.approval_delay:

1752

1378

#We are approved or approval is disabled

1753

1379

break

1754

elif client.approved is None:

1380

elif client._approved is None:

1755

1381

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

1756

1382

client.name)

1757

1383

if self.server.use_dbus:

1768

1394

return

1769

1395

1770

1396

#wait until timeout or approved

1397

#x = float(client

1398

# ._timedelta_to_milliseconds(delay))

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)

1803

1430

sent_size += sent

1804

1431

1805

1432

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

1806

# bump the timeout using extended_timeout

1807

client.bump_timeout(client.extended_timeout)

1433

# bump the timeout as if seen

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

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

1897

args = (request, address))

1898

proc.start()

1899

return proc

1522

multiprocessing.Process(target = self.sub_process_main,

1523

args = (request, address)).start()

1900

1524

1901

1525

1902

1526

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1908

1532

"""

1909

1533

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1910

1534

1911

proc = MultiprocessingMixIn.process_request(self, request,

1912

client_address)

1535

super(MultiprocessingMixInWithPipe,

1536

self).process_request(request, client_address)

1913

1537

self.child_pipe.close()

1914

self.add_pipe(parent_pipe, proc)

1538

self.add_pipe(parent_pipe)

1915

1539

1916

def add_pipe(self, parent_pipe, proc):

1540

def add_pipe(self, parent_pipe):

1917

1541

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

1918

1542

raise NotImplementedError

1919

1543

1928

1552

use_ipv6: Boolean; to use IPv6 or not

1929

1553

"""

1930

1554

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

"""

1555

interface=None, use_ipv6=True):

1935

1556

self.interface = interface

1936

1557

if use_ipv6:

1937

1558

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

1559

socketserver.TCPServer.__init__(self, server_address,

1965

1560

RequestHandlerClass)

1966

1967

1561

def server_bind(self):

1968

1562

"""This overrides the normal server_bind() function

1969

1563

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

1977

1571

try:

1978

1572

self.socket.setsockopt(socket.SOL_SOCKET,

1979

1573

SO_BINDTODEVICE,

1980

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

1574

str(self.interface

1575

+ '\0'))

1981

1576

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:

1577

if error[0] == errno.EPERM:

1578

logger.error("No permission to"

1579

" bind to interface %s",

1580

self.interface)

1581

elif error[0] == errno.ENOPROTOOPT:

1986

1582

logger.error("SO_BINDTODEVICE not available;"

1987

1583

" cannot bind to interface %s",

1988

1584

self.interface)

1989

elif error.errno == errno.ENODEV:

1990

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

1991

" cannot bind", self.interface)

1992

1585

else:

1993

1586

raise

1994

1587

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

1997

1590

if self.address_family == socket.AF_INET6:

1998

1591

any_address = "::" # in6addr_any

1999

1592

else:

2000

any_address = "0.0.0.0" # INADDR_ANY

1593

any_address = socket.INADDR_ANY

2001

1594

self.server_address = (any_address,

2002

1595

self.server_address[1])

2003

1596

elif not self.server_address[1]:

2024

1617

"""

2025

1618

def __init__(self, server_address, RequestHandlerClass,

2026

1619

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

2027

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

1620

gnutls_priority=None, use_dbus=True):

2028

1621

self.enabled = False

2029

1622

self.clients = clients

2030

1623

if self.clients is None:

2031

self.clients = {}

1624

self.clients = set()

2032

1625

self.use_dbus = use_dbus

2033

1626

self.gnutls_priority = gnutls_priority

2034

1627

IPv6_TCPServer.__init__(self, server_address,

2035

1628

RequestHandlerClass,

2036

1629

interface = interface,

2037

use_ipv6 = use_ipv6,

2038

socketfd = socketfd)

1630

use_ipv6 = use_ipv6)

2039

1631

def server_activate(self):

2040

1632

if self.enabled:

2041

1633

return socketserver.TCPServer.server_activate(self)

2042

2043

1634

def enable(self):

2044

1635

self.enabled = True

2045

2046

def add_pipe(self, parent_pipe, proc):

1636

def add_pipe(self, parent_pipe):

2047

1637

# Call "handle_ipc" for both data and EOF events

2048

1638

gobject.io_add_watch(parent_pipe.fileno(),

2049

1639

gobject.IO_IN | gobject.IO_HUP,

2050

1640

functools.partial(self.handle_ipc,

2051

1641

parent_pipe =

2052

parent_pipe,

2053

proc = proc))

2054

1642

parent_pipe))

1643

2055

1644

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

2056

proc = None, client_object=None):

2057

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

2058

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

2059

# Wait for other process to exit

2060

proc.join()

1645

client_object=None):

1646

condition_names = {

1647

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

1648

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

1649

# blocking).

1650

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

1651

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

1652

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

1653

# broken, usually for pipes and

1654

# sockets).

1655

}

1656

conditions_string = ' | '.join(name

1657

for cond, name in

1658

condition_names.iteritems()

1659

if cond & condition)

1660

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

1661

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

2061

1662

return False

2062

1663

2063

1664

# Read a request from the child

2068

1669

fpr = request[1]

2069

1670

address = request[2]

2070

1671

2071

for c in self.clients.itervalues():

1672

for c in self.clients:

2072

1673

if c.fingerprint == fpr:

2073

1674

client = c

2074

1675

break

2087

1688

functools.partial(self.handle_ipc,

2088

1689

parent_pipe =

2089

1690

parent_pipe,

2090

proc = proc,

2091

1691

client_object =

2092

1692

client))

2093

1693

parent_pipe.send(True)

2119

1719

return True

2120

1720

2121

1721

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

1722

def string_to_delta(interval):

2222

1723

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

2223

1724

2234

1735

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

2235

1736

datetime.timedelta(0, 330)

2236

1737

"""

2237

2238

try:

2239

return rfc3339_duration_to_delta(interval)

2240

except ValueError:

2241

pass

2242

2243

1738

timevalue = datetime.timedelta(0)

2244

1739

for s in interval.split():

2245

1740

try:

2256

1751

elif suffix == "w":

2257

1752

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

2258

1753

else:

2259

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

2260

.format(suffix))

1754

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

2261

1755

except (ValueError, IndexError) as e:

2262

1756

raise ValueError(*(e.args))

2263

1757

timevalue += delta

2264

1758

return timevalue

2265

1759

2266

1760

1761

def if_nametoindex(interface):

1762

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

1763

1764

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

1765

global if_nametoindex

1766

try:

1767

if_nametoindex = (ctypes.cdll.LoadLibrary

1768

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

1769

.if_nametoindex)

1770

except (OSError, AttributeError):

1771

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

1772

def if_nametoindex(interface):

1773

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

1774

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

1775

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

1776

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1777

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

1778

interface))

1779

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

1780

ifreq[16:20])[0]

1781

return interface_index

1782

return if_nametoindex(interface)

1783

1784

2267

1785

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

2268

1786

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

2269

1787

2277

1795

sys.exit()

2278

1796

if not noclose:

2279

1797

# Close all standard open file descriptors

2280

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

1798

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

2281

1799

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

2282

1800

raise OSError(errno.ENODEV,

2283

"{0} not a character device"

2284

.format(os.devnull))

1801

"%s not a character device"

1802

% os.path.devnull)

2285

1803

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

2286

1804

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

2287

1805

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

2296

1814

2297

1815

parser = argparse.ArgumentParser()

2298

1816

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

2299

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

1817

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

2300

1818

help="show version number and exit")

2301

1819

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

2302

1820

help="Bind to interface IF")

2308

1826

help="Run self-test")

2309

1827

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

2310

1828

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

2311

" to terminal", default=None)

1829

" to terminal")

2312

1830

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

2313

1831

help="Debug level for stdout output")

2314

1832

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

2321

1839

" files")

2322

1840

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

2323

1841

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

2324

" system bus interface", default=None)

1842

" system bus interface")

2325

1843

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

1844

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

2339

1845

options = parser.parse_args()

2340

1846

2341

1847

if options.check:

2349

1855

"port": "",

2350

1856

"debug": "False",

2351

1857

"priority":

2352

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

1858

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

2353

1859

"servicename": "Mandos",

2354

1860

"use_dbus": "True",

2355

1861

"use_ipv6": "True",

2356

1862

"debuglevel": "",

2357

"restore": "True",

2358

"socket": "",

2359

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

2360

"foreground": "False",

2361

1863

}

2362

1864

2363

1865

# Parse config file for server-global settings

2368

1870

# Convert the SafeConfigParser object to a dict

2369

1871

server_settings = server_config.defaults()

2370

1872

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

2371

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

1873

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

2372

1874

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

2373

1875

option)

2374

1876

if server_settings["port"]:

2375

1877

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

2376

1878

"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

1879

del server_config

2387

1880

2388

1881

# Override the settings from the config file with command line

2389

1882

# options, if set.

2390

1883

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

2391

1884

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

2392

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

2393

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

1885

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

2394

1886

value = getattr(options, option)

2395

1887

if value is not None:

2396

1888

server_settings[option] = value

2399

1891

for option in server_settings.keys():

2400

1892

if type(server_settings[option]) is str:

2401

1893

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

1894

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

2410

1895

2411

1896

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

2415

1900

debuglevel = server_settings["debuglevel"]

2416

1901

use_dbus = server_settings["use_dbus"]

2417

1902

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

1903

2431

1904

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

2432

1905

syslogger.setFormatter(logging.Formatter

2433

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

2434

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

2435

.format(server_settings

2436

["servicename"])))

1906

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

1907

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

1908

% server_settings["servicename"]))

2437

1909

2438

1910

# Parse config file with clients

2439

client_config = configparser.SafeConfigParser(Client

2440

.client_defaults)

1911

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

1912

"extended_timeout": "15m",

1913

"interval": "2m",

1914

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

1915

"host": "",

1916

"approval_delay": "0s",

1917

"approval_duration": "1s",

1918

}

1919

client_config = configparser.SafeConfigParser(client_defaults)

2441

1920

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

2442

1921

"clients.conf"))

2443

1922

2452

1931

use_ipv6=use_ipv6,

2453

1932

gnutls_priority=

2454

1933

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

1934

use_dbus=use_dbus)

1935

if not debug:

1936

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

2461

1937

try:

2462

1938

pidfile = open(pidfilename, "w")

2463

except IOError as e:

2464

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

2465

exc_info=e)

1939

except IOError:

1940

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

2466

1941

2467

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

1942

try:

1943

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

1944

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

1945

except KeyError:

2468

1946

try:

2469

uid = pwd.getpwnam(name).pw_uid

2470

gid = pwd.getpwnam(name).pw_gid

2471

break

1947

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

1948

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

2472

1949

except KeyError:

2473

continue

2474

else:

2475

uid = 65534

2476

gid = 65534

1950

try:

1951

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

1952

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

1953

except KeyError:

1954

uid = 65534

1955

gid = 65534

2477

1956

try:

2478

1957

os.setgid(gid)

2479

1958

os.setuid(uid)

2480

1959

except OSError as error:

2481

if error.errno != errno.EPERM:

1960

if error[0] != errno.EPERM:

2482

1961

raise error

2483

1962

1963

if not debug and not debuglevel:

1964

syslogger.setLevel(logging.WARNING)

1965

console.setLevel(logging.WARNING)

1966

if debuglevel:

1967

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

1968

syslogger.setLevel(level)

1969

console.setLevel(level)

1970

2484

1971

if debug:

2485

1972

# Enable all possible GnuTLS debugging

2486

1973

2496

1983

.gnutls_global_set_log_function(debug_gnutls))

2497

1984

2498

1985

# Redirect stdin so all checkers get /dev/null

2499

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

1986

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

2500

1987

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

2501

1988

if null > 2:

2502

1989

os.close(null)

1990

else:

1991

# No console logging

1992

logger.removeHandler(console)

2503

1993

2504

1994

# Need to fork before connecting to D-Bus

2505

if not foreground:

1995

if not debug:

2506

1996

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

2507

1997

daemon()

2508

1998

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

1999

global main_loop

2514

2000

# From the Avahi example code

2515

DBusGMainLoop(set_as_default=True)

2001

DBusGMainLoop(set_as_default=True )

2516

2002

main_loop = gobject.MainLoop()

2517

2003

bus = dbus.SystemBus()

2518

2004

# End of Avahi example code

2524

2010

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

2525

2011

do_not_queue=True))

2526

2012

except dbus.exceptions.NameExistsException as e:

2527

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

2013

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

2528

2014

use_dbus = False

2529

2015

server_settings["use_dbus"] = False

2530

2016

tcp_server.use_dbus = False

2531

2017

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)

2018

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

2019

servicetype = "_mandos._tcp",

2020

protocol = protocol, bus = bus)

2536

2021

if server_settings["interface"]:

2537

2022

service.interface = (if_nametoindex

2538

2023

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

2542

2027

2543

2028

client_class = Client

2544

2029

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))

2030

client_class = functools.partial(ClientDBusTransitional,

2031

bus = bus)

2032

def client_config_items(config, section):

2033

special_settings = {

2034

"approved_by_default":

2035

lambda: config.getboolean(section,

2036

"approved_by_default"),

2037

}

2038

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

2628

2039

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

2040

yield (name, special_settings[name]())

2041

except KeyError:

2042

yield (name, value)

2043

2044

tcp_server.clients.update(set(

2045

client_class(name = section,

2046

config= dict(client_config_items(

2047

client_config, section)))

2048

for section in client_config.sections()))

2654

2049

if not tcp_server.clients:

2655

2050

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

2051

2052

if not debug:

2053

try:

2054

with pidfile:

2055

pid = os.getpid()

2056

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

2057

del pidfile

2058

except IOError:

2059

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

2060

pidfilename, pid)

2061

except NameError:

2062

# "pidfile" was never created

2063

pass

2667

2064

del pidfilename

2065

2066

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

2668

2067

2669

2068

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

2670

2069

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

2671

2070

2672

2071

if use_dbus:

2673

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

2674

"se.bsnet.fukt.Mandos"})

2675

class MandosDBusService(DBusObjectWithProperties):

2072

class MandosDBusService(dbus.service.Object):

2676

2073

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

2677

2074

def __init__(self):

2678

2075

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

2679

2076

_interface = "se.recompile.Mandos"

2680

2077

2681

@dbus_interface_annotations(_interface)

2682

def _foo(self):

2683

return { "org.freedesktop.DBus.Property"

2684

".EmitsChangedSignal":

2685

"false"}

2686

2687

2078

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

2688

2079

def ClientAdded(self, objpath):

2689

2080

"D-Bus signal"

2703

2094

def GetAllClients(self):

2704

2095

"D-Bus method"

2705

2096

return dbus.Array(c.dbus_object_path

2706

for c in

2707

tcp_server.clients.itervalues())

2097

for c in tcp_server.clients)

2708

2098

2709

2099

@dbus.service.method(_interface,

2710

2100

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

2712

2102

"D-Bus method"

2713

2103

return dbus.Dictionary(

2714

2104

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

2715

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

2105

for c in tcp_server.clients),

2716

2106

signature="oa{sv}")

2717

2107

2718

2108

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

2719

2109

def RemoveClient(self, object_path):

2720

2110

"D-Bus method"

2721

for c in tcp_server.clients.itervalues():

2111

for c in tcp_server.clients:

2722

2112

if c.dbus_object_path == object_path:

2723

del tcp_server.clients[c.name]

2113

tcp_server.clients.remove(c)

2724

2114

c.remove_from_connection()

2725

2115

# Don't signal anything except ClientRemoved

2726

2116

c.disable(quiet=True)

2731

2121

2732

2122

del _interface

2733

2123

2734

mandos_dbus_service = MandosDBusService()

2124

class MandosDBusServiceTransitional(MandosDBusService):

2125

__metaclass__ = AlternateDBusNamesMetaclass

2126

mandos_dbus_service = MandosDBusServiceTransitional()

2735

2127

2736

2128

def cleanup():

2737

2129

"Cleanup function; run on exit"

2738

2130

service.cleanup()

2739

2131

2740

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

2132

while tcp_server.clients:

2797

name, client = tcp_server.clients.popitem()

2133

client = tcp_server.clients.pop()

2798

2134

if use_dbus:

2799

2135

client.remove_from_connection()

2136

client.disable_hook = None

2800

2137

# Don't signal anything except ClientRemoved

2801

2138

client.disable(quiet=True)

2802

2139

if use_dbus:

2804

2141

mandos_dbus_service.ClientRemoved(client

2805

2142

.dbus_object_path,

2806

2143

client.name)

2807

client_settings.clear()

2808

2144

2809

2145

atexit.register(cleanup)

2810

2146

2811

for client in tcp_server.clients.itervalues():

2147

for client in tcp_server.clients:

2812

2148

if use_dbus:

2813

2149

# Emit D-Bus signal

2814

2150

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2815

# Need to initiate checking of clients

2816

if client.enabled:

2817

client.init_checker()

2151

client.enable()

2818

2152

2819

2153

tcp_server.enable()

2820

2154

tcp_server.server_activate()

2823

2157

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

2824

2158

if use_ipv6:

2825

2159

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

2826

" flowinfo %d, scope_id %d",

2827

*tcp_server.socket.getsockname())

2160

" flowinfo %d, scope_id %d"

2161

% tcp_server.socket.getsockname())

2828

2162

else: # IPv4

2829

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

2830

*tcp_server.socket.getsockname())

2163

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

2164

% tcp_server.socket.getsockname())

2831

2165

2832

2166

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

2833

2167

2836

2170

try:

2837

2171

service.activate()

2838

2172

except dbus.exceptions.DBusException as error:

2839

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

2173

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

2840

2174

cleanup()

2841

2175

sys.exit(1)

2842

2176

# End of Avahi example code

2849

2183

logger.debug("Starting main loop")

2850

2184

main_loop.run()

2851

2185

except AvahiError as error:

2852

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

2186

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

2853

2187

cleanup()

2854

2188

sys.exit(1)

2855

2189

except KeyboardInterrupt:

2860

2194

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

2861

2195

cleanup()

2862

2196

2197

2863

2198

if __name__ == '__main__':

2864

2199

main()