/mandos/trunk : revision 633

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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 = "1.4.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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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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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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.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("DBusException: %s", error)

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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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: %s"

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% unicode(error))

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

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.format(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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dbus.exceptions.DBusException):

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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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def _timedelta_to_milliseconds(td):

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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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"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_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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

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

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"last_approval_request", "last_checked_ok",

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

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client_defaults = { "timeout": "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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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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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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self.name = name

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if config is None:

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config = {}

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

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

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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

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self.last_approval_request = None

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self.last_enabled = None

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self.last_checked_ok = None

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

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self.extended_timeout = string_to_delta(config

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["extended_timeout"])

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

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self.disable_hook = disable_hook

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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self.expires = None

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

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self.current_checker_command = None

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self.last_connect = None

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self._approved = None

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

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True)

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self.approved = None

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self.approvals_pending = 0

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self.approval_delay = string_to_delta(

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config["approval_delay"])

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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

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.Lock()))

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self.client_structure = [attr for attr in

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self.__dict__.iterkeys()

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if not attr.startswith("_")]

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self.client_structure.append("client_structure")

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

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lambda obj:

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isinstance(obj,

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property)):

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if not name.startswith("_"):

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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):

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self.changedstate.acquire()

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self.changedstate.notify_all()

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self.changedstate.release()

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with self.changedstate:

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self.changedstate.notify_all()

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def enable(self):

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

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

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# Already enabled

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return

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

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

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if not quiet:

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

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

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

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

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

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if not quiet:

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self.send_changedstate()

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

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return False

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def __del__(self):

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self.disable()

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def init_checker(self):

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

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# and every interval from then on.

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if self.checker_initiator_tag is not None:

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = (gobject.timeout_add

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(self.interval_milliseconds(),

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self.start_checker))

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

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

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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# Also start a new checker *right now*.

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self.start_checker()

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

419

if not quiet:

420

self.send_changedstate()

421

if not quiet:

422

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

423

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

424

gobject.source_remove(self.disable_initiator_tag)

425

self.disable_initiator_tag = None

426

self.expires = None

427

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

428

gobject.source_remove(self.checker_initiator_tag)

429

self.checker_initiator_tag = None

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

433

self.enabled = False

434

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

435

return False

436

437

def __del__(self):

438

self.disable_hook = None

439

self.disable()

440

441

636

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

442

637

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

443

638

self.checker_callback_tag = None

444

639

self.checker = None

445

640

if os.WIFEXITED(condition):

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

641

self.last_checker_status = os.WEXITSTATUS(condition)

642

if self.last_checker_status == 0:

448

643

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

449

644

vars(self))

450

645

self.checked_ok()

452

647

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

453

648

vars(self))

454

649

else:

650

self.last_checker_status = -1

455

651

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

456

652

vars(self))

457

653

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

"""

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."""

464

662

if timeout is None:

465

663

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

467

664

if self.disable_initiator_tag is not None:

468

665

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

469

667

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

470

668

self.disable_initiator_tag = (gobject.timeout_add

471

(_timedelta_to_milliseconds

669

(timedelta_to_milliseconds

472

670

(timeout), self.disable))

473

671

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

474

672

481

679

If a checker already exists, leave it running and do

482

680

nothing."""

483

681

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

484

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

485

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

486

# client would inevitably timeout, since no checker would get

487

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

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

488

686

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

489

687

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

490

688

# should be.

504

702

self.current_checker_command)

505

703

# Start a new checker if needed

506

704

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)

507

710

try:

508

# In case checker_command has exactly one % operator

509

command = self.checker_command % self.host

510

except TypeError:

511

# Escape attributes for the shell

512

escaped_attrs = dict(

513

(attr,

514

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

515

errors=

516

'replace')))

517

for attr in

518

self.runtime_expansions)

519

520

try:

521

command = self.checker_command % escaped_attrs

522

except TypeError as error:

523

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

524

' %s', self.checker_command, error)

525

return True # Try again later

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

526

716

self.current_checker_command = command

527

717

try:

528

718

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

531

721

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

532

722

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

533

723

# 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 })

534

732

self.checker = subprocess.Popen(command,

535

733

close_fds=True,

536

shell=True, cwd="/")

537

self.checker_callback_tag = (gobject.child_watch_add

538

(self.checker.pid,

539

self.checker_callback,

540

data=command))

541

# The checker may have completed before the gobject

542

# watch was added. Check for this.

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:

543

747

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

544

if pid:

545

gobject.source_remove(self.checker_callback_tag)

546

self.checker_callback(pid, status, command)

547

748

except OSError as error:

548

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

549

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)

550

758

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

551

759

return True

552

760

559

767

return

560

768

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

561

769

try:

562

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

770

self.checker.terminate()

563

771

#time.sleep(0.5)

564

772

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

565

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

773

# self.checker.kill()

566

774

except OSError as error:

567

775

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

568

776

raise

585

793

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

586

794

if byte_arrays and signature != "ay":

587

795

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

588

" signature %r" % signature)

796

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

589

797

def decorator(func):

590

798

func._dbus_is_property = True

591

799

func._dbus_interface = dbus_interface

599

807

return decorator

600

808

601

809

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

602

847

class DBusPropertyException(dbus.exceptions.DBusException):

603

848

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

604

849

"""

627

872

"""

628

873

629

874

@staticmethod

630

def _is_dbus_property(obj):

631

return getattr(obj, "_dbus_is_property", False)

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)

632

883

633

def _get_all_dbus_properties(self):

884

def _get_all_dbus_things(self, thing):

634

885

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

635

886

"""

636

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

887

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

888

name),

889

athing.__get__(self))

637

890

for cls in self.__class__.__mro__

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

891

for name, athing in

892

inspect.getmembers(cls,

893

self._is_dbus_thing(thing)))

640

894

641

895

def _get_dbus_property(self, interface_name, property_name):

642

896

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

644

898

"""

645

899

for cls in self.__class__.__mro__:

646

900

for name, value in (inspect.getmembers

647

(cls, self._is_dbus_property)):

901

(cls,

902

self._is_dbus_thing("property"))):

648

903

if (value._dbus_name == property_name

649

904

and value._dbus_interface == interface_name):

650

905

return value.__get__(self)

679

934

# signatures other than "ay".

680

935

if prop._dbus_signature != "ay":

681

936

raise ValueError

682

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

683

for byte in value))

937

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

938

for byte in value))

684

939

prop(value)

685

940

686

941

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

691

946

692

947

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

693

948

"""

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

949

properties = {}

950

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

696

951

if (interface_name

697

952

and interface_name != prop._dbus_interface):

698

953

# Interface non-empty but did not match

702

957

continue

703

958

value = prop()

704

959

if not hasattr(value, "variant_level"):

705

all[name] = value

960

properties[name] = value

706

961

continue

707

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

708

value.variant_level+1)

709

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

962

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

963

value.variant_level+1)

964

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

710

965

711

966

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

712

967

out_signature="s",

713

968

path_keyword='object_path',

714

969

connection_keyword='connection')

715

970

def Introspect(self, object_path, connection):

716

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

971

"""Overloading of standard D-Bus method.

972

973

Inserts property tags and interface annotation tags.

717

974

"""

718

975

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

719

976

connection)

726

983

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

727

984

return e

728

985

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

986

# Add property tags

729

987

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

730

988

for name, prop

731

in self._get_all_dbus_properties()

989

in self._get_all_dbus_things("property")

732

990

if prop._dbus_interface

733

991

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

734

992

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)

735

1024

# Add the names to the return values for the

736

1025

# "org.freedesktop.DBus.Properties" methods

737

1026

if (if_tag.getAttribute("name")

752

1041

except (AttributeError, xml.dom.DOMException,

753

1042

xml.parsers.expat.ExpatError) as error:

754

1043

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

755

error)

1044

exc_info=error)

756

1045

return xmlstring

757

1046

758

1047

759

def datetime_to_dbus (dt, variant_level=0):

1048

def datetime_to_dbus(dt, variant_level=0):

760

1049

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

761

1050

if dt is None:

762

1051

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

763

1052

return dbus.String(dt.isoformat(),

764

1053

variant_level=variant_level)

765

1054

766

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

767

.__metaclass__):

768

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

769

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

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).

770

1078

"""

771

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

772

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

773

# methods, signals, or properties in them

774

for base in (b for b in bases

775

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

776

# Go though all attributes of the base class

777

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

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):

778

1086

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

779

1087

# with the wrong interface name

780

1088

if (not hasattr(attribute, "_dbus_interface")

781

1089

or not attribute._dbus_interface

782

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

1090

.startswith(orig_interface_name)):

783

1091

continue

784

1092

# Create an alternate D-Bus interface name based on

785

1093

# the current name

786

1094

alt_interface = (attribute._dbus_interface

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1095

.replace(orig_interface_name,

1096

alt_interface_name))

1097

interface_names.add(alt_interface)

789

1098

# Is this a D-Bus signal?

790

1099

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

791

# Extract the original non-method function by

792

# black magic

1100

# Extract the original non-method undecorated

1101

# function by black magic

793

1102

nonmethod_func = (dict(

794

1103

zip(attribute.func_code.co_freevars,

795

1104

attribute.__closure__))["func"]

806

1115

nonmethod_func.func_name,

807

1116

nonmethod_func.func_defaults,

808

1117

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

809

1124

# Define a creator of a function to call both the

810

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

811

# signals gets sent when the function is called

1125

# original and alternate functions, so both the

1126

# original and alternate signals gets sent when

1127

# the function is called

812

1128

def fixscope(func1, func2):

813

1129

"""This function is a scope container to pass

814

1130

func1 and func2 to the "call_both" function

821

1137

return call_both

822

1138

# Create the "call_both" function and add it to

823

1139

# the class

824

attr[attrname] = fixscope(attribute,

825

new_function)

1140

attr[attrname] = fixscope(attribute, new_function)

826

1141

# Is this a D-Bus method?

827

1142

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

828

1143

# Create a new, but exactly alike, function

839

1154

attribute.func_name,

840

1155

attribute.func_defaults,

841

1156

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

842

1163

# Is this a D-Bus property?

843

1164

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

844

1165

# Create a new, but exactly alike, function

858

1179

attribute.func_name,

859

1180

attribute.func_defaults,

860

1181

attribute.func_closure)))

861

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

862

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"})

863

1227

class ClientDBus(Client, DBusObjectWithProperties):

864

1228

"""A Client class using D-Bus

865

1229

874

1238

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

875

1239

876

1240

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

877

self._approvals_pending = 0

878

1241

self.bus = bus

879

1242

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

880

1243

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

886

1249

("/clients/" + client_object_name))

887

1250

DBusObjectWithProperties.__init__(self, self.bus,

888

1251

self.dbus_object_path)

889

1252

890

1253

def notifychangeproperty(transform_func,

891

1254

dbus_name, type_func=lambda x: x,

892

1255

variant_level=1):

893

1256

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

894

1257

its changes to DBus.

895

1258

896

1259

transform_fun: Function that takes a value and a variant_level

897

1260

and transforms it to a D-Bus type.

898

1261

dbus_name: D-Bus name of the variable

915

1278

916

1279

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

917

1280

918

919

1281

expires = notifychangeproperty(datetime_to_dbus, "Expires")

920

1282

approvals_pending = notifychangeproperty(dbus.Boolean,

921

1283

"ApprovalPending",

928

1290

checker is not None)

929

1291

last_checked_ok = notifychangeproperty(datetime_to_dbus,

930

1292

"LastCheckedOK")

1293

last_checker_status = notifychangeproperty(dbus.Int16,

1294

"LastCheckerStatus")

931

1295

last_approval_request = notifychangeproperty(

932

1296

datetime_to_dbus, "LastApprovalRequest")

933

1297

approved_by_default = notifychangeproperty(dbus.Boolean,

934

1298

"ApprovedByDefault")

935

approval_delay = notifychangeproperty(dbus.UInt16,

1299

approval_delay = notifychangeproperty(dbus.UInt64,

936

1300

"ApprovalDelay",

937

1301

type_func =

938

_timedelta_to_milliseconds)

1302

timedelta_to_milliseconds)

939

1303

approval_duration = notifychangeproperty(

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1304

dbus.UInt64, "ApprovalDuration",

1305

type_func = timedelta_to_milliseconds)

942

1306

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

943

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

1307

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

944

1308

type_func =

945

_timedelta_to_milliseconds)

1309

timedelta_to_milliseconds)

946

1310

extended_timeout = notifychangeproperty(

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1311

dbus.UInt64, "ExtendedTimeout",

1312

type_func = timedelta_to_milliseconds)

1313

interval = notifychangeproperty(dbus.UInt64,

950

1314

"Interval",

951

1315

type_func =

952

_timedelta_to_milliseconds)

1316

timedelta_to_milliseconds)

953

1317

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

954

1318

955

1319

del notifychangeproperty

997

1361

return r

998

1362

999

1363

def _reset_approved(self):

1000

self._approved = None

1364

self.approved = None

1001

1365

return False

1002

1366

1003

1367

def approve(self, value=True):

1004

self.send_changedstate()

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1368

self.approved = value

1369

gobject.timeout_add(timedelta_to_milliseconds

1007

1370

(self.approval_duration),

1008

1371

self._reset_approved)

1009

1372

self.send_changedstate()

1010

1373

1011

1374

## D-Bus methods, signals & properties

1012

1375

_interface = "se.recompile.Mandos.Client"

1013

1376

1377

## Interfaces

1378

1379

@dbus_interface_annotations(_interface)

1380

def _foo(self):

1381

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

1382

"false"}

1383

1014

1384

## Signals

1015

1385

1016

1386

# CheckerCompleted - signal

1115

1485

access="readwrite")

1116

1486

def ApprovalDuration_dbus_property(self, value=None):

1117

1487

if value is None: # get

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1488

return dbus.UInt64(timedelta_to_milliseconds(

1119

1489

self.approval_duration))

1120

1490

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

1121

1491

1135

1505

def Host_dbus_property(self, value=None):

1136

1506

if value is None: # get

1137

1507

return dbus.String(self.host)

1138

self.host = value

1508

self.host = unicode(value)

1139

1509

1140

1510

# Created - property

1141

1511

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

1142

1512

def Created_dbus_property(self):

1143

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

1513

return datetime_to_dbus(self.created)

1144

1514

1145

1515

# LastEnabled - property

1146

1516

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

1167

1537

return

1168

1538

return datetime_to_dbus(self.last_checked_ok)

1169

1539

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

1170

1546

# Expires - property

1171

1547

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

1172

1548

def Expires_dbus_property(self):

1183

1559

def Timeout_dbus_property(self, value=None):

1184

1560

if value is None: # get

1185

1561

return dbus.UInt64(self.timeout_milliseconds())

1562

old_timeout = self.timeout

1186

1563

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

1187

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

1188

return

1189

# Reschedule timeout

1190

gobject.source_remove(self.disable_initiator_tag)

1191

self.disable_initiator_tag = None

1192

self.expires = None

1193

time_to_die = _timedelta_to_milliseconds((self

1194

.last_checked_ok

1195

+ self.timeout)

1196

- datetime.datetime

1197

.utcnow())

1198

if time_to_die <= 0:

1199

# The timeout has passed

1200

self.disable()

1201

else:

1202

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

1203

+ datetime.timedelta(milliseconds =

1204

time_to_die))

1205

self.disable_initiator_tag = (gobject.timeout_add

1206

(time_to_die, self.disable))

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))

1207

1580

1208

1581

# ExtendedTimeout - property

1209

1582

@dbus_service_property(_interface, signature="t",

1222

1595

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

1223

1596

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

1224

1597

return

1225

# Reschedule checker run

1226

gobject.source_remove(self.checker_initiator_tag)

1227

self.checker_initiator_tag = (gobject.timeout_add

1228

(value, self.start_checker))

1229

self.start_checker() # Start one now, too

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

1230

1604

1231

1605

# Checker - property

1232

1606

@dbus_service_property(_interface, signature="s",

1234

1608

def Checker_dbus_property(self, value=None):

1235

1609

if value is None: # get

1236

1610

return dbus.String(self.checker_command)

1237

self.checker_command = value

1611

self.checker_command = unicode(value)

1238

1612

1239

1613

# CheckerRunning - property

1240

1614

@dbus_service_property(_interface, signature="b",

1269

1643

raise KeyError()

1270

1644

1271

1645

def __getattribute__(self, name):

1272

if(name == '_pipe'):

1646

if name == '_pipe':

1273

1647

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

1274

1648

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

1275

1649

data = self._pipe.recv()

1282

1656

return func

1283

1657

1284

1658

def __setattr__(self, name, value):

1285

if(name == '_pipe'):

1659

if name == '_pipe':

1286

1660

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

1287

1661

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

1288

1662

1289

class ClientDBusTransitional(ClientDBus):

1290

__metaclass__ = AlternateDBusNamesMetaclass

1291

1663

1292

1664

class ClientHandler(socketserver.BaseRequestHandler, object):

1293

1665

"""A class to handle client connections.

1376

1748

client.Rejected("Disabled")

1377

1749

return

1378

1750

1379

if client._approved or not client.approval_delay:

1751

if client.approved or not client.approval_delay:

1380

1752

#We are approved or approval is disabled

1381

1753

break

1382

elif client._approved is None:

1754

elif client.approved is None:

1383

1755

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

1384

1756

client.name)

1385

1757

if self.server.use_dbus:

1398

1770

#wait until timeout or approved

1399

1771

time = datetime.datetime.now()

1400

1772

client.changedstate.acquire()

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1773

client.changedstate.wait(

1774

float(timedelta_to_milliseconds(delay)

1775

/ 1000))

1404

1776

client.changedstate.release()

1405

1777

time2 = datetime.datetime.now()

1406

1778

if (time2 - time) >= delay:

1422

1794

try:

1423

1795

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

1424

1796

except gnutls.errors.GNUTLSError as error:

1425

logger.warning("gnutls send failed")

1797

logger.warning("gnutls send failed",

1798

exc_info=error)

1426

1799

return

1427

1800

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

1428

1801

sent, len(client.secret)

1431

1804

1432

1805

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

1433

1806

# bump the timeout using extended_timeout

1434

client.checked_ok(client.extended_timeout)

1807

client.bump_timeout(client.extended_timeout)

1435

1808

if self.server.use_dbus:

1436

1809

# Emit D-Bus signal

1437

1810

client.GotSecret()

1442

1815

try:

1443

1816

session.bye()

1444

1817

except gnutls.errors.GNUTLSError as error:

1445

logger.warning("GnuTLS bye failed")

1818

logger.warning("GnuTLS bye failed",

1819

exc_info=error)

1446

1820

1447

1821

@staticmethod

1448

1822

def peer_certificate(session):

1504

1878

# Convert the buffer to a Python bytestring

1505

1879

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

1506

1880

# Convert the bytestring to hexadecimal notation

1507

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

1881

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

1508

1882

return hex_fpr

1509

1883

1510

1884

1513

1887

def sub_process_main(self, request, address):

1514

1888

try:

1515

1889

self.finish_request(request, address)

1516

except:

1890

except Exception:

1517

1891

self.handle_error(request, address)

1518

1892

self.close_request(request)

1519

1893

1520

1894

def process_request(self, request, address):

1521

1895

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

1522

1896

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

1523

args = (request,

1524

address))

1897

args = (request, address))

1525

1898

proc.start()

1526

1899

return proc

1527

1900

1555

1928

use_ipv6: Boolean; to use IPv6 or not

1556

1929

"""

1557

1930

def __init__(self, server_address, RequestHandlerClass,

1558

interface=None, use_ipv6=True):

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

"""

1559

1935

self.interface = interface

1560

1936

if use_ipv6:

1561

1937

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.

1562

1964

socketserver.TCPServer.__init__(self, server_address,

1563

1965

RequestHandlerClass)

1966

1564

1967

def server_bind(self):

1565

1968

"""This overrides the normal server_bind() function

1566

1969

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

1574

1977

try:

1575

1978

self.socket.setsockopt(socket.SOL_SOCKET,

1576

1979

SO_BINDTODEVICE,

1577

str(self.interface

1578

+ '\0'))

1980

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

1579

1981

except socket.error as error:

1580

if error[0] == errno.EPERM:

1581

logger.error("No permission to"

1582

" bind to interface %s",

1583

self.interface)

1584

elif error[0] == errno.ENOPROTOOPT:

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:

1585

1986

logger.error("SO_BINDTODEVICE not available;"

1586

1987

" cannot bind to interface %s",

1587

1988

self.interface)

1989

elif error.errno == errno.ENODEV:

1990

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

1991

" cannot bind", self.interface)

1588

1992

else:

1589

1993

raise

1590

1994

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

1593

1997

if self.address_family == socket.AF_INET6:

1594

1998

any_address = "::" # in6addr_any

1595

1999

else:

1596

any_address = socket.INADDR_ANY

2000

any_address = "0.0.0.0" # INADDR_ANY

1597

2001

self.server_address = (any_address,

1598

2002

self.server_address[1])

1599

2003

elif not self.server_address[1]:

1620

2024

"""

1621

2025

def __init__(self, server_address, RequestHandlerClass,

1622

2026

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

1623

gnutls_priority=None, use_dbus=True):

2027

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

1624

2028

self.enabled = False

1625

2029

self.clients = clients

1626

2030

if self.clients is None:

1627

self.clients = set()

2031

self.clients = {}

1628

2032

self.use_dbus = use_dbus

1629

2033

self.gnutls_priority = gnutls_priority

1630

2034

IPv6_TCPServer.__init__(self, server_address,

1631

2035

RequestHandlerClass,

1632

2036

interface = interface,

1633

use_ipv6 = use_ipv6)

2037

use_ipv6 = use_ipv6,

2038

socketfd = socketfd)

1634

2039

def server_activate(self):

1635

2040

if self.enabled:

1636

2041

return socketserver.TCPServer.server_activate(self)

1649

2054

1650

2055

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

1651

2056

proc = None, client_object=None):

1652

condition_names = {

1653

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

1654

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

1655

# blocking).

1656

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

1657

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

1658

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

1659

# broken, usually for pipes and

1660

# sockets).

1661

}

1662

conditions_string = ' | '.join(name

1663

for cond, name in

1664

condition_names.iteritems()

1665

if cond & condition)

1666

2057

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

1667

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

2058

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

1668

2059

# Wait for other process to exit

1669

2060

proc.join()

1670

2061

return False

1677

2068

fpr = request[1]

1678

2069

address = request[2]

1679

2070

1680

for c in self.clients:

2071

for c in self.clients.itervalues():

1681

2072

if c.fingerprint == fpr:

1682

2073

client = c

1683

2074

break

1728

2119

return True

1729

2120

1730

2121

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

1731

2221

def string_to_delta(interval):

1732

2222

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

1733

2223

1744

2234

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

1745

2235

datetime.timedelta(0, 330)

1746

2236

"""

2237

2238

try:

2239

return rfc3339_duration_to_delta(interval)

2240

except ValueError:

2241

pass

2242

1747

2243

timevalue = datetime.timedelta(0)

1748

2244

for s in interval.split():

1749

2245

try:

1760

2256

elif suffix == "w":

1761

2257

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

1762

2258

else:

1763

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

2259

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

2260

.format(suffix))

1764

2261

except (ValueError, IndexError) as e:

1765

2262

raise ValueError(*(e.args))

1766

2263

timevalue += delta

1767

2264

return timevalue

1768

2265

1769

2266

1770

def if_nametoindex(interface):

1771

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

1772

1773

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

1774

global if_nametoindex

1775

try:

1776

if_nametoindex = (ctypes.cdll.LoadLibrary

1777

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

1778

.if_nametoindex)

1779

except (OSError, AttributeError):

1780

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

1781

def if_nametoindex(interface):

1782

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

1783

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

1784

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

1785

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1786

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

1787

interface))

1788

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

1789

ifreq[16:20])[0]

1790

return interface_index

1791

return if_nametoindex(interface)

1792

1793

1794

2267

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

1795

2268

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

1796

2269

1804

2277

sys.exit()

1805

2278

if not noclose:

1806

2279

# Close all standard open file descriptors

1807

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

2280

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

1808

2281

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

1809

2282

raise OSError(errno.ENODEV,

1810

"%s not a character device"

1811

% os.path.devnull)

2283

"{0} not a character device"

2284

.format(os.devnull))

1812

2285

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

1813

2286

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

1814

2287

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

1823

2296

1824

2297

parser = argparse.ArgumentParser()

1825

2298

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

1826

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

2299

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

1827

2300

help="show version number and exit")

1828

2301

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

1829

2302

help="Bind to interface IF")

1835

2308

help="Run self-test")

1836

2309

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

1837

2310

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

1838

" to terminal")

2311

" to terminal", default=None)

1839

2312

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

1840

2313

help="Debug level for stdout output")

1841

2314

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

1848

2321

" files")

1849

2322

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

1850

2323

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

1851

" system bus interface")

2324

" system bus interface", default=None)

1852

2325

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

1853

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

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

1854

2339

options = parser.parse_args()

1855

2340

1856

2341

if options.check:

1864

2349

"port": "",

1865

2350

"debug": "False",

1866

2351

"priority":

1867

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

2352

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

1868

2353

"servicename": "Mandos",

1869

2354

"use_dbus": "True",

1870

2355

"use_ipv6": "True",

1871

2356

"debuglevel": "",

2357

"restore": "True",

2358

"socket": "",

2359

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

2360

"foreground": "False",

1872

2361

}

1873

2362

1874

2363

# Parse config file for server-global settings

1879

2368

# Convert the SafeConfigParser object to a dict

1880

2369

server_settings = server_config.defaults()

1881

2370

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

1882

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

2371

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

1883

2372

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

1884

2373

option)

1885

2374

if server_settings["port"]:

1886

2375

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

1887

2376

"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"])

1888

2386

del server_config

1889

2387

1890

2388

# Override the settings from the config file with command line

1891

2389

# options, if set.

1892

2390

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

1893

2391

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

1894

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

2392

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

2393

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

1895

2394

value = getattr(options, option)

1896

2395

if value is not None:

1897

2396

server_settings[option] = value

1900

2399

for option in server_settings.keys():

1901

2400

if type(server_settings[option]) is str:

1902

2401

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

1903

2409

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

1904

2410

1905

2411

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

1909

2415

debuglevel = server_settings["debuglevel"]

1910

2416

use_dbus = server_settings["use_dbus"]

1911

2417

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)

1912

2430

1913

2431

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

1914

2432

syslogger.setFormatter(logging.Formatter

1915

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

1916

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

1917

% server_settings["servicename"]))

2433

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

2434

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

2435

.format(server_settings

2436

["servicename"])))

1918

2437

1919

2438

# Parse config file with clients

1920

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

1921

"extended_timeout": "15m",

1922

"interval": "2m",

1923

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

1924

"host": "",

1925

"approval_delay": "0s",

1926

"approval_duration": "1s",

1927

}

1928

client_config = configparser.SafeConfigParser(client_defaults)

2439

client_config = configparser.SafeConfigParser(Client

2440

.client_defaults)

1929

2441

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

1930

2442

"clients.conf"))

1931

2443

1940

2452

use_ipv6=use_ipv6,

1941

2453

gnutls_priority=

1942

2454

server_settings["priority"],

1943

use_dbus=use_dbus)

1944

if not debug:

1945

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

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

1946

2461

try:

1947

2462

pidfile = open(pidfilename, "w")

1948

except IOError:

1949

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

2463

except IOError as e:

2464

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

2465

exc_info=e)

1950

2466

1951

try:

1952

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

1953

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

1954

except KeyError:

2467

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

1955

2468

try:

1956

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

1957

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

2469

uid = pwd.getpwnam(name).pw_uid

2470

gid = pwd.getpwnam(name).pw_gid

2471

break

1958

2472

except KeyError:

1959

try:

1960

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

1961

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

1962

except KeyError:

1963

uid = 65534

1964

gid = 65534

2473

continue

2474

else:

2475

uid = 65534

2476

gid = 65534

1965

2477

try:

1966

2478

os.setgid(gid)

1967

2479

os.setuid(uid)

1968

2480

except OSError as error:

1969

if error[0] != errno.EPERM:

2481

if error.errno != errno.EPERM:

1970

2482

raise error

1971

2483

1972

if not debug and not debuglevel:

1973

syslogger.setLevel(logging.WARNING)

1974

console.setLevel(logging.WARNING)

1975

if debuglevel:

1976

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

1977

syslogger.setLevel(level)

1978

console.setLevel(level)

1979

1980

2484

if debug:

1981

2485

# Enable all possible GnuTLS debugging

1982

2486

1992

2496

.gnutls_global_set_log_function(debug_gnutls))

1993

2497

1994

2498

# Redirect stdin so all checkers get /dev/null

1995

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

2499

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

1996

2500

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

1997

2501

if null > 2:

1998

2502

os.close(null)

1999

else:

2000

# No console logging

2001

logger.removeHandler(console)

2002

2503

2003

2504

# Need to fork before connecting to D-Bus

2004

if not debug:

2505

if not foreground:

2005

2506

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

2006

2507

daemon()

2007

2508

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

2008

2513

global main_loop

2009

2514

# From the Avahi example code

2010

DBusGMainLoop(set_as_default=True )

2515

DBusGMainLoop(set_as_default=True)

2011

2516

main_loop = gobject.MainLoop()

2012

2517

bus = dbus.SystemBus()

2013

2518

# End of Avahi example code

2019

2524

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

2020

2525

do_not_queue=True))

2021

2526

except dbus.exceptions.NameExistsException as e:

2022

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

2527

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

2023

2528

use_dbus = False

2024

2529

server_settings["use_dbus"] = False

2025

2530

tcp_server.use_dbus = False

2026

2531

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2027

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

2028

servicetype = "_mandos._tcp",

2029

protocol = protocol, bus = bus)

2532

service = AvahiServiceToSyslog(name =

2533

server_settings["servicename"],

2534

servicetype = "_mandos._tcp",

2535

protocol = protocol, bus = bus)

2030

2536

if server_settings["interface"]:

2031

2537

service.interface = (if_nametoindex

2032

2538

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

2036

2542

2037

2543

client_class = Client

2038

2544

if use_dbus:

2039

client_class = functools.partial(ClientDBusTransitional,

2040

bus = bus)

2041

def client_config_items(config, section):

2042

special_settings = {

2043

"approved_by_default":

2044

lambda: config.getboolean(section,

2045

"approved_by_default"),

2046

}

2047

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

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))

2048

2628

try:

2049

yield (name, special_settings[name]())

2050

except KeyError:

2051

yield (name, value)

2052

2053

tcp_server.clients.update(set(

2054

client_class(name = section,

2055

config= dict(client_config_items(

2056

client_config, section)))

2057

for section in client_config.sections()))

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

2058

2654

if not tcp_server.clients:

2059

2655

logger.warning("No clients defined")

2060

2061

if not debug:

2062

try:

2063

with pidfile:

2064

pid = os.getpid()

2065

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

2066

del pidfile

2067

except IOError:

2068

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

2069

pidfilename, pid)

2070

except NameError:

2071

# "pidfile" was never created

2072

pass

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

2073

2667

del pidfilename

2074

2075

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

2076

2668

2077

2669

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

2078

2670

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

2079

2671

2080

2672

if use_dbus:

2081

class MandosDBusService(dbus.service.Object):

2673

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

2674

"se.bsnet.fukt.Mandos"})

2675

class MandosDBusService(DBusObjectWithProperties):

2082

2676

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

2083

2677

def __init__(self):

2084

2678

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

2085

2679

_interface = "se.recompile.Mandos"

2086

2680

2681

@dbus_interface_annotations(_interface)

2682

def _foo(self):

2683

return { "org.freedesktop.DBus.Property"

2684

".EmitsChangedSignal":

2685

"false"}

2686

2087

2687

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

2088

2688

def ClientAdded(self, objpath):

2089

2689

"D-Bus signal"

2103

2703

def GetAllClients(self):

2104

2704

"D-Bus method"

2105

2705

return dbus.Array(c.dbus_object_path

2106

for c in tcp_server.clients)

2706

for c in

2707

tcp_server.clients.itervalues())

2107

2708

2108

2709

@dbus.service.method(_interface,

2109

2710

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

2111

2712

"D-Bus method"

2112

2713

return dbus.Dictionary(

2113

2714

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

2114

for c in tcp_server.clients),

2715

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

2115

2716

signature="oa{sv}")

2116

2717

2117

2718

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

2118

2719

def RemoveClient(self, object_path):

2119

2720

"D-Bus method"

2120

for c in tcp_server.clients:

2721

for c in tcp_server.clients.itervalues():

2121

2722

if c.dbus_object_path == object_path:

2122

tcp_server.clients.remove(c)

2723

del tcp_server.clients[c.name]

2123

2724

c.remove_from_connection()

2124

2725

# Don't signal anything except ClientRemoved

2125

2726

c.disable(quiet=True)

2130

2731

2131

2732

del _interface

2132

2733

2133

class MandosDBusServiceTransitional(MandosDBusService):

2134

__metaclass__ = AlternateDBusNamesMetaclass

2135

mandos_dbus_service = MandosDBusServiceTransitional()

2734

mandos_dbus_service = MandosDBusService()

2136

2735

2137

2736

def cleanup():

2138

2737

"Cleanup function; run on exit"

2139

2738

service.cleanup()

2140

2739

2141

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

2142

2796

while tcp_server.clients:

2143

client = tcp_server.clients.pop()

2797

name, client = tcp_server.clients.popitem()

2144

2798

if use_dbus:

2145

2799

client.remove_from_connection()

2146

client.disable_hook = None

2147

2800

# Don't signal anything except ClientRemoved

2148

2801

client.disable(quiet=True)

2149

2802

if use_dbus:

2151

2804

mandos_dbus_service.ClientRemoved(client

2152

2805

.dbus_object_path,

2153

2806

client.name)

2807

client_settings.clear()

2154

2808

2155

2809

atexit.register(cleanup)

2156

2810

2157

for client in tcp_server.clients:

2811

for client in tcp_server.clients.itervalues():

2158

2812

if use_dbus:

2159

2813

# Emit D-Bus signal

2160

2814

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2161

client.enable()

2815

# Need to initiate checking of clients

2816

if client.enabled:

2817

client.init_checker()

2162

2818

2163

2819

tcp_server.enable()

2164

2820

tcp_server.server_activate()

2167

2823

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

2168

2824

if use_ipv6:

2169

2825

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

2170

" flowinfo %d, scope_id %d"

2171

% tcp_server.socket.getsockname())

2826

" flowinfo %d, scope_id %d",

2827

*tcp_server.socket.getsockname())

2172

2828

else: # IPv4

2173

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

2174

% tcp_server.socket.getsockname())

2829

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

2830

*tcp_server.socket.getsockname())

2175

2831

2176

2832

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

2177

2833

2180

2836

try:

2181

2837

service.activate()

2182

2838

except dbus.exceptions.DBusException as error:

2183

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

2839

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

2184

2840

cleanup()

2185

2841

sys.exit(1)

2186

2842

# End of Avahi example code

2193

2849

logger.debug("Starting main loop")

2194

2850

main_loop.run()

2195

2851

except AvahiError as error:

2196

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

2852

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

2197

2853

cleanup()

2198

2854

sys.exit(1)

2199

2855

except KeyboardInterrupt:

2204

2860

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

2205

2861

cleanup()

2206

2862

2207

2208

2863

if __name__ == '__main__':

2209

2864

main()