/mandos/release : revision 237.7.203

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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 = "1.4.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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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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version = "1.6.3"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = None

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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 = (logging.handlers.SysLogHandler

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(facility =

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logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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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", "")

359

self.created = datetime.datetime.utcnow()

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self.enabled = False

361

self.last_approval_request = None

362

self.last_enabled = None

363

self.last_checked_ok = None

364

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

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self.extended_timeout = string_to_delta(config

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["extended_timeout"])

367

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

368

self.disable_hook = disable_hook

556

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

557

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

372

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

376

self.last_connect = None

377

self._approved = None

378

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

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True)

565

self.approved = None

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self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

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.Condition(multiprocessing_manager

387

569

.Lock()))

570

self.client_structure = [attr for attr in

571

self.__dict__.iterkeys()

572

if not attr.startswith("_")]

573

self.client_structure.append("client_structure")

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

576

lambda obj:

577

isinstance(obj,

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property)):

579

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()

392

self.changedstate.release()

584

with self.changedstate:

585

self.changedstate.notify_all()

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def enable(self):

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

396

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

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# Already enabled

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return

592

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

593

self.enabled = True

594

self.last_enabled = datetime.datetime.utcnow()

595

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."""

600

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

601

return False

602

if not quiet:

603

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

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

605

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)

610

self.checker_initiator_tag = None

611

self.stop_checker()

612

self.enabled = False

613

if not quiet:

614

self.send_changedstate()

615

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

616

return False

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618

def __del__(self):

619

self.disable()

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621

def init_checker(self):

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

401

623

# and every interval from then on.

624

if self.checker_initiator_tag is not None:

625

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

406

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

630

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))

410

self.enabled = True

411

self.last_enabled = datetime.datetime.utcnow()

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635

# Also start a new checker *right now*.

413

636

self.start_checker()

414

637

415

def disable(self, quiet=True):

416

"""Disable this client."""

417

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

418

return False

419

if not quiet:

420

self.send_changedstate()

421

if not quiet:

422

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

423

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

424

gobject.source_remove(self.disable_initiator_tag)

425

self.disable_initiator_tag = None

426

self.expires = None

427

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

428

gobject.source_remove(self.checker_initiator_tag)

429

self.checker_initiator_tag = None

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

433

self.enabled = False

434

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

435

return False

436

437

def __del__(self):

438

self.disable_hook = None

439

self.disable()

440

441

638

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

442

639

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

443

640

self.checker_callback_tag = None

444

641

self.checker = None

445

642

if os.WIFEXITED(condition):

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

643

self.last_checker_status = os.WEXITSTATUS(condition)

644

if self.last_checker_status == 0:

448

645

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

449

646

vars(self))

450

647

self.checked_ok()

452

649

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

453

650

vars(self))

454

651

else:

652

self.last_checker_status = -1

455

653

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

456

654

vars(self))

457

655

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

"""

656

def checked_ok(self):

657

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

658

self.last_checked_ok = datetime.datetime.utcnow()

659

self.last_checker_status = 0

660

self.bump_timeout()

661

662

def bump_timeout(self, timeout=None):

663

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

464

664

if timeout is None:

465

665

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

467

gobject.source_remove(self.disable_initiator_tag)

468

self.disable_initiator_tag = (gobject.timeout_add

469

(_timedelta_to_milliseconds

470

(timeout), self.disable))

471

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

666

if self.disable_initiator_tag is not None:

667

gobject.source_remove(self.disable_initiator_tag)

668

self.disable_initiator_tag = None

669

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

670

self.disable_initiator_tag = (gobject.timeout_add

671

(timedelta_to_milliseconds

672

(timeout), self.disable))

673

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

472

674

473

675

def need_approval(self):

474

676

self.last_approval_request = datetime.datetime.utcnow()

479

681

If a checker already exists, leave it running and do

480

682

nothing."""

481

683

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

482

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

483

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

484

# client would inevitably timeout, since no checker would get

485

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

684

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

685

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

686

# would inevitably timeout, since no checker would get a

687

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

486

688

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

487

689

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

488

690

# should be.

490

692

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

491

693

try:

492

694

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

493

except (AttributeError, OSError) as error:

494

if (isinstance(error, OSError)

495

and error.errno != errno.ECHILD):

496

raise error

695

except AttributeError:

696

pass

697

except OSError as error:

698

if error.errno != errno.ECHILD:

699

raise

497

700

else:

498

701

if pid:

499

702

logger.warning("Checker was a zombie")

502

705

self.current_checker_command)

503

706

# Start a new checker if needed

504

707

if self.checker is None:

708

# Escape attributes for the shell

709

escaped_attrs = dict(

710

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

711

for attr in

712

self.runtime_expansions)

505

713

try:

506

# In case checker_command has exactly one % operator

507

command = self.checker_command % self.host

508

except TypeError:

509

# Escape attributes for the shell

510

escaped_attrs = dict(

511

(attr,

512

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

513

errors=

514

'replace')))

515

for attr in

516

self.runtime_expansions)

517

518

try:

519

command = self.checker_command % escaped_attrs

520

except TypeError as error:

521

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

522

' %s', self.checker_command, error)

523

return True # Try again later

714

command = self.checker_command % escaped_attrs

715

except TypeError as error:

716

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

717

self.checker_command, exc_info=error)

718

return True # Try again later

524

719

self.current_checker_command = command

525

720

try:

526

721

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

529

724

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

530

725

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

531

726

# always replaced by /dev/null.)

727

# The exception is when not debugging but nevertheless

728

# running in the foreground; use the previously

729

# created wnull.

730

popen_args = {}

731

if (not self.server_settings["debug"]

732

and self.server_settings["foreground"]):

733

popen_args.update({"stdout": wnull,

734

"stderr": wnull })

532

735

self.checker = subprocess.Popen(command,

533

736

close_fds=True,

534

shell=True, cwd="/")

535

self.checker_callback_tag = (gobject.child_watch_add

536

(self.checker.pid,

537

self.checker_callback,

538

data=command))

539

# The checker may have completed before the gobject

540

# watch was added. Check for this.

737

shell=True, cwd="/",

738

**popen_args)

739

except OSError as error:

740

logger.error("Failed to start subprocess",

741

exc_info=error)

742

return True

743

self.checker_callback_tag = (gobject.child_watch_add

744

(self.checker.pid,

745

self.checker_callback,

746

data=command))

747

# The checker may have completed before the gobject

748

# watch was added. Check for this.

749

try:

541

750

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

542

if pid:

543

gobject.source_remove(self.checker_callback_tag)

544

self.checker_callback(pid, status, command)

545

751

except OSError as error:

546

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

547

error)

752

if error.errno == errno.ECHILD:

753

# This should never happen

754

logger.error("Child process vanished",

755

exc_info=error)

756

return True

757

raise

758

if pid:

759

gobject.source_remove(self.checker_callback_tag)

760

self.checker_callback(pid, status, command)

548

761

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

549

762

return True

550

763

557

770

return

558

771

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

559

772

try:

560

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

773

self.checker.terminate()

561

774

#time.sleep(0.5)

562

775

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

563

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

776

# self.checker.kill()

564

777

except OSError as error:

565

778

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

566

779

raise

583

796

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

584

797

if byte_arrays and signature != "ay":

585

798

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

586

" signature %r" % signature)

799

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

587

800

def decorator(func):

588

801

func._dbus_is_property = True

589

802

func._dbus_interface = dbus_interface

597

810

return decorator

598

811

599

812

813

def dbus_interface_annotations(dbus_interface):

814

"""Decorator for marking functions returning interface annotations

815

816

Usage:

817

818

@dbus_interface_annotations("org.example.Interface")

819

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

820

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

821

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

822

"false"}

823

"""

824

def decorator(func):

825

func._dbus_is_interface = True

826

func._dbus_interface = dbus_interface

827

func._dbus_name = dbus_interface

828

return func

829

return decorator

830

831

832

def dbus_annotations(annotations):

833

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

834

Usage:

835

836

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

837

access="r")

838

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

839

"org.freedesktop.DBus.Property."

840

"EmitsChangedSignal": "false"})

841

def Property_dbus_property(self):

842

return dbus.Boolean(False)

843

"""

844

def decorator(func):

845

func._dbus_annotations = annotations

846

return func

847

return decorator

848

849

600

850

class DBusPropertyException(dbus.exceptions.DBusException):

601

851

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

602

852

"""

625

875

"""

626

876

627

877

@staticmethod

628

def _is_dbus_property(obj):

629

return getattr(obj, "_dbus_is_property", False)

878

def _is_dbus_thing(thing):

879

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

880

881

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

882

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

883

"""

884

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

885

False)

630

886

631

def _get_all_dbus_properties(self):

887

def _get_all_dbus_things(self, thing):

632

888

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

633

889

"""

634

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

890

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

891

name),

892

athing.__get__(self))

635

893

for cls in self.__class__.__mro__

636

for name, prop in

637

inspect.getmembers(cls, self._is_dbus_property))

894

for name, athing in

895

inspect.getmembers(cls,

896

self._is_dbus_thing(thing)))

638

897

639

898

def _get_dbus_property(self, interface_name, property_name):

640

899

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

642

901

"""

643

902

for cls in self.__class__.__mro__:

644

903

for name, value in (inspect.getmembers

645

(cls, self._is_dbus_property)):

904

(cls,

905

self._is_dbus_thing("property"))):

646

906

if (value._dbus_name == property_name

647

907

and value._dbus_interface == interface_name):

648

908

return value.__get__(self)

676

936

# The byte_arrays option is not supported yet on

677

937

# signatures other than "ay".

678

938

if prop._dbus_signature != "ay":

679

raise ValueError

680

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

681

for byte in value))

939

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

940

"'ay' signature {0!r}"

941

.format(prop._dbus_signature))

942

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

943

for byte in value))

682

944

prop(value)

683

945

684

946

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

689

951

690

952

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

691

953

"""

692

all = {}

693

for name, prop in self._get_all_dbus_properties():

954

properties = {}

955

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

694

956

if (interface_name

695

957

and interface_name != prop._dbus_interface):

696

958

# Interface non-empty but did not match

700

962

continue

701

963

value = prop()

702

964

if not hasattr(value, "variant_level"):

703

all[name] = value

965

properties[name] = value

704

966

continue

705

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

706

value.variant_level+1)

707

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

967

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

968

value.variant_level+1)

969

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

708

970

709

971

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

710

972

out_signature="s",

711

973

path_keyword='object_path',

712

974

connection_keyword='connection')

713

975

def Introspect(self, object_path, connection):

714

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

976

"""Overloading of standard D-Bus method.

977

978

Inserts property tags and interface annotation tags.

715

979

"""

716

980

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

717

981

connection)

724

988

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

725

989

return e

726

990

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

991

# Add property tags

727

992

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

728

993

for name, prop

729

in self._get_all_dbus_properties()

994

in self._get_all_dbus_things("property")

730

995

if prop._dbus_interface

731

996

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

732

997

if_tag.appendChild(tag)

998

# Add annotation tags

999

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

1000

for tag in if_tag.getElementsByTagName(typ):

1001

annots = dict()

1002

for name, prop in (self.

1003

_get_all_dbus_things(typ)):

1004

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

1005

and prop._dbus_interface

1006

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

1007

annots.update(getattr

1008

(prop,

1009

"_dbus_annotations",

1010

{}))

1011

for name, value in annots.iteritems():

1012

ann_tag = document.createElement(

1013

"annotation")

1014

ann_tag.setAttribute("name", name)

1015

ann_tag.setAttribute("value", value)

1016

tag.appendChild(ann_tag)

1017

# Add interface annotation tags

1018

for annotation, value in dict(

1019

itertools.chain.from_iterable(

1020

annotations().iteritems()

1021

for name, annotations in

1022

self._get_all_dbus_things("interface")

1023

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

1024

)).iteritems():

1025

ann_tag = document.createElement("annotation")

1026

ann_tag.setAttribute("name", annotation)

1027

ann_tag.setAttribute("value", value)

1028

if_tag.appendChild(ann_tag)

733

1029

# Add the names to the return values for the

734

1030

# "org.freedesktop.DBus.Properties" methods

735

1031

if (if_tag.getAttribute("name")

750

1046

except (AttributeError, xml.dom.DOMException,

751

1047

xml.parsers.expat.ExpatError) as error:

752

1048

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

753

error)

1049

exc_info=error)

754

1050

return xmlstring

755

1051

756

1052

757

def datetime_to_dbus (dt, variant_level=0):

1053

def datetime_to_dbus(dt, variant_level=0):

758

1054

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

759

1055

if dt is None:

760

1056

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

761

1057

return dbus.String(dt.isoformat(),

762

1058

variant_level=variant_level)

763

1059

764

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

765

.__metaclass__):

766

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

767

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

1060

1061

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1062

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

1063

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

1064

interface names according to the "alt_interface_names" mapping.

1065

Usage:

1066

1067

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

1068

"net.example.AlternateInterface"})

1069

class SampleDBusObject(dbus.service.Object):

1070

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

1071

def SampleDBusMethod():

1072

pass

1073

1074

The above "SampleDBusMethod" on "SampleDBusObject" will be

1075

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

1076

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

1077

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

1078

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

1079

1080

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

1081

(from DBusObjectWithProperties) and interfaces (from the

1082

dbus_interface_annotations decorator).

768

1083

"""

769

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

770

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

771

# methods, signals, or properties in them

772

for base in (b for b in bases

773

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

774

# Go though all attributes of the base class

775

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

1084

def wrapper(cls):

1085

for orig_interface_name, alt_interface_name in (

1086

alt_interface_names.iteritems()):

1087

attr = {}

1088

interface_names = set()

1089

# Go though all attributes of the class

1090

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

776

1091

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

777

1092

# with the wrong interface name

778

1093

if (not hasattr(attribute, "_dbus_interface")

779

1094

or not attribute._dbus_interface

780

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

1095

.startswith(orig_interface_name)):

781

1096

continue

782

1097

# Create an alternate D-Bus interface name based on

783

1098

# the current name

784

1099

alt_interface = (attribute._dbus_interface

785

.replace("se.recompile.Mandos",

786

"se.bsnet.fukt.Mandos"))

1100

.replace(orig_interface_name,

1101

alt_interface_name))

1102

interface_names.add(alt_interface)

787

1103

# Is this a D-Bus signal?

788

1104

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

789

# Extract the original non-method function by

790

# black magic

1105

# Extract the original non-method undecorated

1106

# function by black magic

791

1107

nonmethod_func = (dict(

792

1108

zip(attribute.func_code.co_freevars,

793

1109

attribute.__closure__))["func"]

804

1120

nonmethod_func.func_name,

805

1121

nonmethod_func.func_defaults,

806

1122

nonmethod_func.func_closure)))

1123

# Copy annotations, if any

1124

try:

1125

new_function._dbus_annotations = (

1126

dict(attribute._dbus_annotations))

1127

except AttributeError:

1128

pass

807

1129

# Define a creator of a function to call both the

808

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

809

# signals gets sent when the function is called

1130

# original and alternate functions, so both the

1131

# original and alternate signals gets sent when

1132

# the function is called

810

1133

def fixscope(func1, func2):

811

1134

"""This function is a scope container to pass

812

1135

func1 and func2 to the "call_both" function

819

1142

return call_both

820

1143

# Create the "call_both" function and add it to

821

1144

# the class

822

attr[attrname] = fixscope(attribute,

823

new_function)

1145

attr[attrname] = fixscope(attribute, new_function)

824

1146

# Is this a D-Bus method?

825

1147

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

826

1148

# Create a new, but exactly alike, function

837

1159

attribute.func_name,

838

1160

attribute.func_defaults,

839

1161

attribute.func_closure)))

1162

# Copy annotations, if any

1163

try:

1164

attr[attrname]._dbus_annotations = (

1165

dict(attribute._dbus_annotations))

1166

except AttributeError:

1167

pass

840

1168

# Is this a D-Bus property?

841

1169

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

842

1170

# Create a new, but exactly alike, function

856

1184

attribute.func_name,

857

1185

attribute.func_defaults,

858

1186

attribute.func_closure)))

859

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

860

1187

# Copy annotations, if any

1188

try:

1189

attr[attrname]._dbus_annotations = (

1190

dict(attribute._dbus_annotations))

1191

except AttributeError:

1192

pass

1193

# Is this a D-Bus interface?

1194

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

1195

# Create a new, but exactly alike, function

1196

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

1197

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

1198

# to the class.

1199

attr[attrname] = (dbus_interface_annotations

1200

(alt_interface)

1201

(types.FunctionType

1202

(attribute.func_code,

1203

attribute.func_globals,

1204

attribute.func_name,

1205

attribute.func_defaults,

1206

attribute.func_closure)))

1207

if deprecate:

1208

# Deprecate all alternate interfaces

1209

iname="_AlternateDBusNames_interface_annotation{0}"

1210

for interface_name in interface_names:

1211

@dbus_interface_annotations(interface_name)

1212

def func(self):

1213

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

1214

"true" }

1215

# Find an unused name

1216

for aname in (iname.format(i)

1217

for i in itertools.count()):

1218

if aname not in attr:

1219

attr[aname] = func

1220

break

1221

if interface_names:

1222

# Replace the class with a new subclass of it with

1223

# methods, signals, etc. as created above.

1224

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

1225

(cls,), attr)

1226

return cls

1227

return wrapper

1228

1229

1230

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

1231

"se.bsnet.fukt.Mandos"})

861

1232

class ClientDBus(Client, DBusObjectWithProperties):

862

1233

"""A Client class using D-Bus

863

1234

872

1243

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

873

1244

874

1245

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

875

self._approvals_pending = 0

876

1246

self.bus = bus

877

1247

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

878

1248

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

884

1254

("/clients/" + client_object_name))

885

1255

DBusObjectWithProperties.__init__(self, self.bus,

886

1256

self.dbus_object_path)

887

1257

888

1258

def notifychangeproperty(transform_func,

889

1259

dbus_name, type_func=lambda x: x,

890

1260

variant_level=1):

891

1261

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

892

1262

its changes to DBus.

893

1263

894

1264

transform_fun: Function that takes a value and a variant_level

895

1265

and transforms it to a D-Bus type.

896

1266

dbus_name: D-Bus name of the variable

913

1283

914

1284

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

915

1285

916

917

1286

expires = notifychangeproperty(datetime_to_dbus, "Expires")

918

1287

approvals_pending = notifychangeproperty(dbus.Boolean,

919

1288

"ApprovalPending",

926

1295

checker is not None)

927

1296

last_checked_ok = notifychangeproperty(datetime_to_dbus,

928

1297

"LastCheckedOK")

1298

last_checker_status = notifychangeproperty(dbus.Int16,

1299

"LastCheckerStatus")

929

1300

last_approval_request = notifychangeproperty(

930

1301

datetime_to_dbus, "LastApprovalRequest")

931

1302

approved_by_default = notifychangeproperty(dbus.Boolean,

932

1303

"ApprovedByDefault")

933

approval_delay = notifychangeproperty(dbus.UInt16,

1304

approval_delay = notifychangeproperty(dbus.UInt64,

934

1305

"ApprovalDelay",

935

1306

type_func =

936

_timedelta_to_milliseconds)

1307

timedelta_to_milliseconds)

937

1308

approval_duration = notifychangeproperty(

938

dbus.UInt16, "ApprovalDuration",

939

type_func = _timedelta_to_milliseconds)

1309

dbus.UInt64, "ApprovalDuration",

1310

type_func = timedelta_to_milliseconds)

940

1311

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

941

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

1312

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

942

1313

type_func =

943

_timedelta_to_milliseconds)

1314

timedelta_to_milliseconds)

944

1315

extended_timeout = notifychangeproperty(

945

dbus.UInt16, "ExtendedTimeout",

946

type_func = _timedelta_to_milliseconds)

947

interval = notifychangeproperty(dbus.UInt16,

1316

dbus.UInt64, "ExtendedTimeout",

1317

type_func = timedelta_to_milliseconds)

1318

interval = notifychangeproperty(dbus.UInt64,

948

1319

"Interval",

949

1320

type_func =

950

_timedelta_to_milliseconds)

1321

timedelta_to_milliseconds)

951

1322

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

952

1323

953

1324

del notifychangeproperty

995

1366

return r

996

1367

997

1368

def _reset_approved(self):

998

self._approved = None

1369

self.approved = None

999

1370

return False

1000

1371

1001

1372

def approve(self, value=True):

1002

self.send_changedstate()

1003

self._approved = value

1004

gobject.timeout_add(_timedelta_to_milliseconds

1373

self.approved = value

1374

gobject.timeout_add(timedelta_to_milliseconds

1005

1375

(self.approval_duration),

1006

1376

self._reset_approved)

1007

1377

self.send_changedstate()

1008

1378

1009

1379

## D-Bus methods, signals & properties

1010

1380

_interface = "se.recompile.Mandos.Client"

1011

1381

1382

## Interfaces

1383

1384

@dbus_interface_annotations(_interface)

1385

def _foo(self):

1386

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

1387

"false"}

1388

1012

1389

## Signals

1013

1390

1014

1391

# CheckerCompleted - signal

1113

1490

access="readwrite")

1114

1491

def ApprovalDuration_dbus_property(self, value=None):

1115

1492

if value is None: # get

1116

return dbus.UInt64(_timedelta_to_milliseconds(

1493

return dbus.UInt64(timedelta_to_milliseconds(

1117

1494

self.approval_duration))

1118

1495

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

1119

1496

1133

1510

def Host_dbus_property(self, value=None):

1134

1511

if value is None: # get

1135

1512

return dbus.String(self.host)

1136

self.host = value

1513

self.host = unicode(value)

1137

1514

1138

1515

# Created - property

1139

1516

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

1140

1517

def Created_dbus_property(self):

1141

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

1518

return datetime_to_dbus(self.created)

1142

1519

1143

1520

# LastEnabled - property

1144

1521

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

1165

1542

return

1166

1543

return datetime_to_dbus(self.last_checked_ok)

1167

1544

1545

# LastCheckerStatus - property

1546

@dbus_service_property(_interface, signature="n",

1547

access="read")

1548

def LastCheckerStatus_dbus_property(self):

1549

return dbus.Int16(self.last_checker_status)

1550

1168

1551

# Expires - property

1169

1552

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

1170

1553

def Expires_dbus_property(self):

1181

1564

def Timeout_dbus_property(self, value=None):

1182

1565

if value is None: # get

1183

1566

return dbus.UInt64(self.timeout_milliseconds())

1567

old_timeout = self.timeout

1184

1568

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

1185

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

1186

return

1187

# Reschedule timeout

1188

gobject.source_remove(self.disable_initiator_tag)

1189

self.disable_initiator_tag = None

1190

self.expires = None

1191

time_to_die = _timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow())

1196

if time_to_die <= 0:

1197

# The timeout has passed

1198

self.disable()

1199

else:

1200

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

1201

+ datetime.timedelta(milliseconds =

1202

time_to_die))

1203

self.disable_initiator_tag = (gobject.timeout_add

1204

(time_to_die, self.disable))

1569

# Reschedule disabling

1570

if self.enabled:

1571

now = datetime.datetime.utcnow()

1572

self.expires += self.timeout - old_timeout

1573

if self.expires <= now:

1574

# The timeout has passed

1575

self.disable()

1576

else:

1577

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

1578

is None):

1579

return

1580

gobject.source_remove(self.disable_initiator_tag)

1581

self.disable_initiator_tag = (

1582

gobject.timeout_add(

1583

timedelta_to_milliseconds(self.expires - now),

1584

self.disable))

1205

1585

1206

1586

# ExtendedTimeout - property

1207

1587

@dbus_service_property(_interface, signature="t",

1220

1600

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

1221

1601

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

1222

1602

return

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

1603

if self.enabled:

1604

# Reschedule checker run

1605

gobject.source_remove(self.checker_initiator_tag)

1606

self.checker_initiator_tag = (gobject.timeout_add

1607

(value, self.start_checker))

1608

self.start_checker() # Start one now, too

1228

1609

1229

1610

# Checker - property

1230

1611

@dbus_service_property(_interface, signature="s",

1232

1613

def Checker_dbus_property(self, value=None):

1233

1614

if value is None: # get

1234

1615

return dbus.String(self.checker_command)

1235

self.checker_command = value

1616

self.checker_command = unicode(value)

1236

1617

1237

1618

# CheckerRunning - property

1238

1619

@dbus_service_property(_interface, signature="b",

1267

1648

raise KeyError()

1268

1649

1269

1650

def __getattribute__(self, name):

1270

if(name == '_pipe'):

1651

if name == '_pipe':

1271

1652

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

1272

1653

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

1273

1654

data = self._pipe.recv()

1280

1661

return func

1281

1662

1282

1663

def __setattr__(self, name, value):

1283

if(name == '_pipe'):

1664

if name == '_pipe':

1284

1665

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

1285

1666

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

1286

1667

1287

class ClientDBusTransitional(ClientDBus):

1288

__metaclass__ = AlternateDBusNamesMetaclass

1289

1668

1290

1669

class ClientHandler(socketserver.BaseRequestHandler, object):

1291

1670

"""A class to handle client connections.

1328

1707

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

1329

1708

try:

1330

1709

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

1331

raise RuntimeError

1710

raise RuntimeError(line)

1332

1711

except (ValueError, IndexError, RuntimeError) as error:

1333

1712

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

1334

1713

return

1374

1753

client.Rejected("Disabled")

1375

1754

return

1376

1755

1377

if client._approved or not client.approval_delay:

1756

if client.approved or not client.approval_delay:

1378

1757

#We are approved or approval is disabled

1379

1758

break

1380

elif client._approved is None:

1759

elif client.approved is None:

1381

1760

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

1382

1761

client.name)

1383

1762

if self.server.use_dbus:

1396

1775

#wait until timeout or approved

1397

1776

time = datetime.datetime.now()

1398

1777

client.changedstate.acquire()

1399

(client.changedstate.wait

1400

(float(client._timedelta_to_milliseconds(delay)

1401

/ 1000)))

1778

client.changedstate.wait(

1779

float(timedelta_to_milliseconds(delay)

1780

/ 1000))

1402

1781

client.changedstate.release()

1403

1782

time2 = datetime.datetime.now()

1404

1783

if (time2 - time) >= delay:

1420

1799

try:

1421

1800

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

1422

1801

except gnutls.errors.GNUTLSError as error:

1423

logger.warning("gnutls send failed")

1802

logger.warning("gnutls send failed",

1803

exc_info=error)

1424

1804

return

1425

1805

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

1426

1806

sent, len(client.secret)

1429

1809

1430

1810

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

1431

1811

# bump the timeout using extended_timeout

1432

client.checked_ok(client.extended_timeout)

1812

client.bump_timeout(client.extended_timeout)

1433

1813

if self.server.use_dbus:

1434

1814

# Emit D-Bus signal

1435

1815

client.GotSecret()

1440

1820

try:

1441

1821

session.bye()

1442

1822

except gnutls.errors.GNUTLSError as error:

1443

logger.warning("GnuTLS bye failed")

1823

logger.warning("GnuTLS bye failed",

1824

exc_info=error)

1444

1825

1445

1826

@staticmethod

1446

1827

def peer_certificate(session):

1502

1883

# Convert the buffer to a Python bytestring

1503

1884

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

1504

1885

# Convert the bytestring to hexadecimal notation

1505

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

1886

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

1506

1887

return hex_fpr

1507

1888

1508

1889

1511

1892

def sub_process_main(self, request, address):

1512

1893

try:

1513

1894

self.finish_request(request, address)

1514

except:

1895

except Exception:

1515

1896

self.handle_error(request, address)

1516

1897

self.close_request(request)

1517

1898

1518

1899

def process_request(self, request, address):

1519

1900

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

1520

1901

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

1521

args = (request,

1522

address))

1902

args = (request, address))

1523

1903

proc.start()

1524

1904

return proc

1525

1905

1540

1920

1541

1921

def add_pipe(self, parent_pipe, proc):

1542

1922

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

1543

raise NotImplementedError

1923

raise NotImplementedError()

1544

1924

1545

1925

1546

1926

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1553

1933

use_ipv6: Boolean; to use IPv6 or not

1554

1934

"""

1555

1935

def __init__(self, server_address, RequestHandlerClass,

1556

interface=None, use_ipv6=True):

1936

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

1937

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

1938

creating a new one with socket.socket().

1939

"""

1557

1940

self.interface = interface

1558

1941

if use_ipv6:

1559

1942

self.address_family = socket.AF_INET6

1943

if socketfd is not None:

1944

# Save the file descriptor

1945

self.socketfd = socketfd

1946

# Save the original socket.socket() function

1947

self.socket_socket = socket.socket

1948

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

1949

#

1950

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

1951

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

1952

# patching socket.socket.)

1953

#

1954

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

1955

@functools.wraps(socket.socket)

1956

def socket_wrapper(*args, **kwargs):

1957

# Restore original function so subsequent calls are

1958

# not affected.

1959

socket.socket = self.socket_socket

1960

del self.socket_socket

1961

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

1962

# saved file descriptor.

1963

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

1964

# Replace socket.socket() function with wrapper

1965

socket.socket = socket_wrapper

1966

# The socketserver.TCPServer.__init__ will call

1967

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

1968

# socket_wrapper(), if socketfd was set.

1560

1969

socketserver.TCPServer.__init__(self, server_address,

1561

1970

RequestHandlerClass)

1971

1562

1972

def server_bind(self):

1563

1973

"""This overrides the normal server_bind() function

1564

1974

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

1572

1982

try:

1573

1983

self.socket.setsockopt(socket.SOL_SOCKET,

1574

1984

SO_BINDTODEVICE,

1575

str(self.interface

1576

+ '\0'))

1985

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

1577

1986

except socket.error as error:

1578

if error[0] == errno.EPERM:

1579

logger.error("No permission to"

1580

" bind to interface %s",

1581

self.interface)

1582

elif error[0] == errno.ENOPROTOOPT:

1987

if error.errno == errno.EPERM:

1988

logger.error("No permission to bind to"

1989

" interface %s", self.interface)

1990

elif error.errno == errno.ENOPROTOOPT:

1583

1991

logger.error("SO_BINDTODEVICE not available;"

1584

1992

" cannot bind to interface %s",

1585

1993

self.interface)

1994

elif error.errno == errno.ENODEV:

1995

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

1996

" cannot bind", self.interface)

1586

1997

else:

1587

1998

raise

1588

1999

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

1591

2002

if self.address_family == socket.AF_INET6:

1592

2003

any_address = "::" # in6addr_any

1593

2004

else:

1594

any_address = socket.INADDR_ANY

2005

any_address = "0.0.0.0" # INADDR_ANY

1595

2006

self.server_address = (any_address,

1596

2007

self.server_address[1])

1597

2008

elif not self.server_address[1]:

1618

2029

"""

1619

2030

def __init__(self, server_address, RequestHandlerClass,

1620

2031

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

1621

gnutls_priority=None, use_dbus=True):

2032

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

1622

2033

self.enabled = False

1623

2034

self.clients = clients

1624

2035

if self.clients is None:

1625

self.clients = set()

2036

self.clients = {}

1626

2037

self.use_dbus = use_dbus

1627

2038

self.gnutls_priority = gnutls_priority

1628

2039

IPv6_TCPServer.__init__(self, server_address,

1629

2040

RequestHandlerClass,

1630

2041

interface = interface,

1631

use_ipv6 = use_ipv6)

2042

use_ipv6 = use_ipv6,

2043

socketfd = socketfd)

1632

2044

def server_activate(self):

1633

2045

if self.enabled:

1634

2046

return socketserver.TCPServer.server_activate(self)

1647

2059

1648

2060

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

1649

2061

proc = None, client_object=None):

1650

condition_names = {

1651

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

1652

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

1653

# blocking).

1654

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

1655

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

1656

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

1657

# broken, usually for pipes and

1658

# sockets).

1659

}

1660

conditions_string = ' | '.join(name

1661

for cond, name in

1662

condition_names.iteritems()

1663

if cond & condition)

1664

2062

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

1665

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

2063

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

1666

2064

# Wait for other process to exit

1667

2065

proc.join()

1668

2066

return False

1675

2073

fpr = request[1]

1676

2074

address = request[2]

1677

2075

1678

for c in self.clients:

2076

for c in self.clients.itervalues():

1679

2077

if c.fingerprint == fpr:

1680

2078

client = c

1681

2079

break

1726

2124

return True

1727

2125

1728

2126

2127

def rfc3339_duration_to_delta(duration):

2128

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

2129

2130

>>> rfc3339_duration_to_delta("P7D")

2131

datetime.timedelta(7)

2132

>>> rfc3339_duration_to_delta("PT60S")

2133

datetime.timedelta(0, 60)

2134

>>> rfc3339_duration_to_delta("PT60M")

2135

datetime.timedelta(0, 3600)

2136

>>> rfc3339_duration_to_delta("PT24H")

2137

datetime.timedelta(1)

2138

>>> rfc3339_duration_to_delta("P1W")

2139

datetime.timedelta(7)

2140

>>> rfc3339_duration_to_delta("PT5M30S")

2141

datetime.timedelta(0, 330)

2142

>>> rfc3339_duration_to_delta("P1DT3M20S")

2143

datetime.timedelta(1, 200)

2144

"""

2145

2146

# Parsing an RFC 3339 duration with regular expressions is not

2147

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

2148

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

2149

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

2150

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

2151

# avoid excessive use of external libraries.

2152

2153

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

2154

Token = collections.namedtuple("Token",

2155

("regexp", # To match token; if

2156

# "value" is not None,

2157

# must have a "group"

2158

# containing digits

2159

"value", # datetime.timedelta or

2160

# None

2161

"followers")) # Tokens valid after

2162

# this token

2163

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

2164

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

2165

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

2166

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

2167

datetime.timedelta(seconds=1),

2168

frozenset((token_end,)))

2169

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

2170

datetime.timedelta(minutes=1),

2171

frozenset((token_second, token_end)))

2172

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

2173

datetime.timedelta(hours=1),

2174

frozenset((token_minute, token_end)))

2175

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

2176

None,

2177

frozenset((token_hour, token_minute,

2178

token_second)))

2179

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

2180

datetime.timedelta(days=1),

2181

frozenset((token_time, token_end)))

2182

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

2183

datetime.timedelta(weeks=4),

2184

frozenset((token_day, token_end)))

2185

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

2186

datetime.timedelta(weeks=52),

2187

frozenset((token_month, token_end)))

2188

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

2189

datetime.timedelta(weeks=1),

2190

frozenset((token_end,)))

2191

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

2192

frozenset((token_year, token_month,

2193

token_day, token_time,

2194

token_week))),

2195

# Define starting values

2196

value = datetime.timedelta() # Value so far

2197

found_token = None

2198

followers = frozenset(token_duration,) # Following valid tokens

2199

s = duration # String left to parse

2200

# Loop until end token is found

2201

while found_token is not token_end:

2202

# Search for any currently valid tokens

2203

for token in followers:

2204

match = token.regexp.match(s)

2205

if match is not None:

2206

# Token found

2207

if token.value is not None:

2208

# Value found, parse digits

2209

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

2210

# Add to value so far

2211

value += factor * token.value

2212

# Strip token from string

2213

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

2214

# Go to found token

2215

found_token = token

2216

# Set valid next tokens

2217

followers = found_token.followers

2218

break

2219

else:

2220

# No currently valid tokens were found

2221

raise ValueError("Invalid RFC 3339 duration")

2222

# End token found

2223

return value

2224

2225

1729

2226

def string_to_delta(interval):

1730

2227

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

1731

2228

1742

2239

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

1743

2240

datetime.timedelta(0, 330)

1744

2241

"""

2242

2243

try:

2244

return rfc3339_duration_to_delta(interval)

2245

except ValueError:

2246

pass

2247

1745

2248

timevalue = datetime.timedelta(0)

1746

2249

for s in interval.split():

1747

2250

try:

1758

2261

elif suffix == "w":

1759

2262

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

1760

2263

else:

1761

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

1762

except (ValueError, IndexError) as e:

2264

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

2265

.format(suffix))

2266

except IndexError as e:

1763

2267

raise ValueError(*(e.args))

1764

2268

timevalue += delta

1765

2269

return timevalue

1766

2270

1767

2271

1768

def if_nametoindex(interface):

1769

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

1770

1771

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

1772

global if_nametoindex

1773

try:

1774

if_nametoindex = (ctypes.cdll.LoadLibrary

1775

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

1776

.if_nametoindex)

1777

except (OSError, AttributeError):

1778

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

1779

def if_nametoindex(interface):

1780

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

1781

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

1782

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

1783

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1784

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

1785

interface))

1786

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

1787

ifreq[16:20])[0]

1788

return interface_index

1789

return if_nametoindex(interface)

1790

1791

1792

2272

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

1793

2273

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

1794

2274

1802

2282

sys.exit()

1803

2283

if not noclose:

1804

2284

# Close all standard open file descriptors

1805

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

2285

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

1806

2286

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

1807

2287

raise OSError(errno.ENODEV,

1808

"%s not a character device"

1809

% os.path.devnull)

2288

"{0} not a character device"

2289

.format(os.devnull))

1810

2290

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

1811

2291

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

1812

2292

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

1821

2301

1822

2302

parser = argparse.ArgumentParser()

1823

2303

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

1824

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

2304

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

1825

2305

help="show version number and exit")

1826

2306

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

1827

2307

help="Bind to interface IF")

1833

2313

help="Run self-test")

1834

2314

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

1835

2315

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

1836

" to terminal")

2316

" to terminal", default=None)

1837

2317

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

1838

2318

help="Debug level for stdout output")

1839

2319

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

1846

2326

" files")

1847

2327

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

1848

2328

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

1849

" system bus interface")

2329

" system bus interface", default=None)

1850

2330

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

1851

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

2331

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

2332

default=None)

2333

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

2334

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

2335

" state", default=None)

2336

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

2337

help="Specify a file descriptor to a network"

2338

" socket to use instead of creating one")

2339

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

2340

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

2341

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

2342

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

2343

1852

2344

options = parser.parse_args()

1853

2345

1854

2346

if options.check:

1855

2347

import doctest

1856

doctest.testmod()

1857

sys.exit()

2348

fail_count, test_count = doctest.testmod()

2349

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

1858

2350

1859

2351

# Default values for config file for server-global settings

1860

2352

server_defaults = { "interface": "",

1862

2354

"port": "",

1863

2355

"debug": "False",

1864

2356

"priority":

1865

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

2357

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

1866

2358

"servicename": "Mandos",

1867

2359

"use_dbus": "True",

1868

2360

"use_ipv6": "True",

1869

2361

"debuglevel": "",

2362

"restore": "True",

2363

"socket": "",

2364

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

2365

"foreground": "False",

1870

2366

}

1871

2367

1872

2368

# Parse config file for server-global settings

1877

2373

# Convert the SafeConfigParser object to a dict

1878

2374

server_settings = server_config.defaults()

1879

2375

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

1880

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

2376

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

1881

2377

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

1882

2378

option)

1883

2379

if server_settings["port"]:

1884

2380

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

1885

2381

"port")

2382

if server_settings["socket"]:

2383

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

2384

"socket")

2385

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

2386

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

2387

# happen with a supplied network socket.

2388

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

2389

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

2390

["socket"])

1886

2391

del server_config

1887

2392

1888

2393

# Override the settings from the config file with command line

1889

2394

# options, if set.

1890

2395

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

1891

2396

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

1892

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

2397

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

2398

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

1893

2399

value = getattr(options, option)

1894

2400

if value is not None:

1895

2401

server_settings[option] = value

1898

2404

for option in server_settings.keys():

1899

2405

if type(server_settings[option]) is str:

1900

2406

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

2407

# Force all boolean options to be boolean

2408

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

2409

"foreground"):

2410

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

2411

# Debug implies foreground

2412

if server_settings["debug"]:

2413

server_settings["foreground"] = True

1901

2414

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

1902

2415

1903

2416

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

1907

2420

debuglevel = server_settings["debuglevel"]

1908

2421

use_dbus = server_settings["use_dbus"]

1909

2422

use_ipv6 = server_settings["use_ipv6"]

2423

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

2424

stored_state_file)

2425

foreground = server_settings["foreground"]

2426

2427

if debug:

2428

initlogger(debug, logging.DEBUG)

2429

else:

2430

if not debuglevel:

2431

initlogger(debug)

2432

else:

2433

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

2434

initlogger(debug, level)

1910

2435

1911

2436

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

1912

2437

syslogger.setFormatter(logging.Formatter

1913

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

1914

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

1915

% server_settings["servicename"]))

2438

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

2439

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

2440

.format(server_settings

2441

["servicename"])))

1916

2442

1917

2443

# Parse config file with clients

1918

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

1919

"extended_timeout": "15m",

1920

"interval": "2m",

1921

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

1922

"host": "",

1923

"approval_delay": "0s",

1924

"approval_duration": "1s",

1925

}

1926

client_config = configparser.SafeConfigParser(client_defaults)

2444

client_config = configparser.SafeConfigParser(Client

2445

.client_defaults)

1927

2446

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

1928

2447

"clients.conf"))

1929

2448

1938

2457

use_ipv6=use_ipv6,

1939

2458

gnutls_priority=

1940

2459

server_settings["priority"],

1941

use_dbus=use_dbus)

1942

if not debug:

1943

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

2460

use_dbus=use_dbus,

2461

socketfd=(server_settings["socket"]

2462

or None))

2463

if not foreground:

2464

pidfilename = "/run/mandos.pid"

2465

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

2466

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

2467

pidfile = None

1944

2468

try:

1945

2469

pidfile = open(pidfilename, "w")

1946

except IOError:

1947

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

2470

except IOError as e:

2471

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

2472

exc_info=e)

1948

2473

1949

try:

1950

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

1951

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

1952

except KeyError:

2474

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

1953

2475

try:

1954

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

1955

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

2476

uid = pwd.getpwnam(name).pw_uid

2477

gid = pwd.getpwnam(name).pw_gid

2478

break

1956

2479

except KeyError:

1957

try:

1958

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

1959

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

1960

except KeyError:

1961

uid = 65534

1962

gid = 65534

2480

continue

2481

else:

2482

uid = 65534

2483

gid = 65534

1963

2484

try:

1964

2485

os.setgid(gid)

1965

2486

os.setuid(uid)

1966

2487

except OSError as error:

1967

if error[0] != errno.EPERM:

1968

raise error

1969

1970

if not debug and not debuglevel:

1971

syslogger.setLevel(logging.WARNING)

1972

console.setLevel(logging.WARNING)

1973

if debuglevel:

1974

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

1975

syslogger.setLevel(level)

1976

console.setLevel(level)

2488

if error.errno != errno.EPERM:

2489

raise

1977

2490

1978

2491

if debug:

1979

2492

# Enable all possible GnuTLS debugging

1990

2503

.gnutls_global_set_log_function(debug_gnutls))

1991

2504

1992

2505

# Redirect stdin so all checkers get /dev/null

1993

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

2506

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

1994

2507

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

1995

2508

if null > 2:

1996

2509

os.close(null)

1997

else:

1998

# No console logging

1999

logger.removeHandler(console)

2000

2510

2001

2511

# Need to fork before connecting to D-Bus

2002

if not debug:

2512

if not foreground:

2003

2513

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

2004

2514

daemon()

2005

2515

2516

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

2517

# need to inform gobject that threads will be used.

2518

gobject.threads_init()

2519

2006

2520

global main_loop

2007

2521

# From the Avahi example code

2008

DBusGMainLoop(set_as_default=True )

2522

DBusGMainLoop(set_as_default=True)

2009

2523

main_loop = gobject.MainLoop()

2010

2524

bus = dbus.SystemBus()

2011

2525

# End of Avahi example code

2017

2531

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

2018

2532

do_not_queue=True))

2019

2533

except dbus.exceptions.NameExistsException as e:

2020

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

2534

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

2021

2535

use_dbus = False

2022

2536

server_settings["use_dbus"] = False

2023

2537

tcp_server.use_dbus = False

2024

2538

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2025

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

2026

servicetype = "_mandos._tcp",

2027

protocol = protocol, bus = bus)

2539

service = AvahiServiceToSyslog(name =

2540

server_settings["servicename"],

2541

servicetype = "_mandos._tcp",

2542

protocol = protocol, bus = bus)

2028

2543

if server_settings["interface"]:

2029

2544

service.interface = (if_nametoindex

2030

2545

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

2034

2549

2035

2550

client_class = Client

2036

2551

if use_dbus:

2037

client_class = functools.partial(ClientDBusTransitional,

2038

bus = bus)

2039

def client_config_items(config, section):

2040

special_settings = {

2041

"approved_by_default":

2042

lambda: config.getboolean(section,

2043

"approved_by_default"),

2044

}

2045

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

2552

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

2553

2554

client_settings = Client.config_parser(client_config)

2555

old_client_settings = {}

2556

clients_data = {}

2557

2558

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

2559

global wnull

2560

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

2561

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

2562

# mode

2563

if debug or not foreground:

2564

wnull.close()

2565

2566

# Get client data and settings from last running state.

2567

if server_settings["restore"]:

2568

try:

2569

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

2570

clients_data, old_client_settings = (pickle.load

2571

(stored_state))

2572

os.remove(stored_state_path)

2573

except IOError as e:

2574

if e.errno == errno.ENOENT:

2575

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

2576

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

2577

else:

2578

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

2579

exc_info=e)

2580

raise

2581

except EOFError as e:

2582

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

2583

"EOFError:", exc_info=e)

2584

2585

with PGPEngine() as pgp:

2586

for client_name, client in clients_data.iteritems():

2587

# Skip removed clients

2588

if client_name not in client_settings:

2589

continue

2590

2591

# Decide which value to use after restoring saved state.

2592

# We have three different values: Old config file,

2593

# new config file, and saved state.

2594

# New config value takes precedence if it differs from old

2595

# config value, otherwise use saved state.

2596

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

2597

try:

2598

# For each value in new config, check if it

2599

# differs from the old config value (Except for

2600

# the "secret" attribute)

2601

if (name != "secret" and

2602

value != old_client_settings[client_name]

2603

[name]):

2604

client[name] = value

2605

except KeyError:

2606

pass

2607

2608

# Clients who has passed its expire date can still be

2609

# enabled if its last checker was successful. Clients

2610

# whose checker succeeded before we stored its state is

2611

# assumed to have successfully run all checkers during

2612

# downtime.

2613

if client["enabled"]:

2614

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

2615

if not client["last_checked_ok"]:

2616

logger.warning(

2617

"disabling client {0} - Client never "

2618

"performed a successful checker"

2619

.format(client_name))

2620

client["enabled"] = False

2621

elif client["last_checker_status"] != 0:

2622

logger.warning(

2623

"disabling client {0} - Client "

2624

"last checker failed with error code {1}"

2625

.format(client_name,

2626

client["last_checker_status"]))

2627

client["enabled"] = False

2628

else:

2629

client["expires"] = (datetime.datetime

2630

.utcnow()

2631

+ client["timeout"])

2632

logger.debug("Last checker succeeded,"

2633

" keeping {0} enabled"

2634

.format(client_name))

2046

2635

try:

2047

yield (name, special_settings[name]())

2048

except KeyError:

2049

yield (name, value)

2050

2051

tcp_server.clients.update(set(

2052

client_class(name = section,

2053

config= dict(client_config_items(

2054

client_config, section)))

2055

for section in client_config.sections()))

2636

client["secret"] = (

2637

pgp.decrypt(client["encrypted_secret"],

2638

client_settings[client_name]

2639

["secret"]))

2640

except PGPError:

2641

# If decryption fails, we use secret from new settings

2642

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

2643

.format(client_name))

2644

client["secret"] = (

2645

client_settings[client_name]["secret"])

2646

2647

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

2648

for client_name in (set(old_client_settings)

2649

- set(client_settings)):

2650

del clients_data[client_name]

2651

for client_name in (set(client_settings)

2652

- set(old_client_settings)):

2653

clients_data[client_name] = client_settings[client_name]

2654

2655

# Create all client objects

2656

for client_name, client in clients_data.iteritems():

2657

tcp_server.clients[client_name] = client_class(

2658

name = client_name, settings = client,

2659

server_settings = server_settings)

2660

2056

2661

if not tcp_server.clients:

2057

2662

logger.warning("No clients defined")

2058

2059

if not debug:

2060

try:

2061

with pidfile:

2062

pid = os.getpid()

2063

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

2064

del pidfile

2065

except IOError:

2066

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

2067

pidfilename, pid)

2068

except NameError:

2069

# "pidfile" was never created

2070

pass

2663

2664

if not foreground:

2665

if pidfile is not None:

2666

try:

2667

with pidfile:

2668

pid = os.getpid()

2669

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

2670

except IOError:

2671

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

2672

pidfilename, pid)

2673

del pidfile

2071

2674

del pidfilename

2072

2073

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

2074

2675

2075

2676

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

2076

2677

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

2077

2678

2078

2679

if use_dbus:

2079

class MandosDBusService(dbus.service.Object):

2680

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

2681

"se.bsnet.fukt.Mandos"})

2682

class MandosDBusService(DBusObjectWithProperties):

2080

2683

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

2081

2684

def __init__(self):

2082

2685

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

2083

2686

_interface = "se.recompile.Mandos"

2084

2687

2688

@dbus_interface_annotations(_interface)

2689

def _foo(self):

2690

return { "org.freedesktop.DBus.Property"

2691

".EmitsChangedSignal":

2692

"false"}

2693

2085

2694

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

2086

2695

def ClientAdded(self, objpath):

2087

2696

"D-Bus signal"

2101

2710

def GetAllClients(self):

2102

2711

"D-Bus method"

2103

2712

return dbus.Array(c.dbus_object_path

2104

for c in tcp_server.clients)

2713

for c in

2714

tcp_server.clients.itervalues())

2105

2715

2106

2716

@dbus.service.method(_interface,

2107

2717

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

2109

2719

"D-Bus method"

2110

2720

return dbus.Dictionary(

2111

2721

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

2112

for c in tcp_server.clients),

2722

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

2113

2723

signature="oa{sv}")

2114

2724

2115

2725

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

2116

2726

def RemoveClient(self, object_path):

2117

2727

"D-Bus method"

2118

for c in tcp_server.clients:

2728

for c in tcp_server.clients.itervalues():

2119

2729

if c.dbus_object_path == object_path:

2120

tcp_server.clients.remove(c)

2730

del tcp_server.clients[c.name]

2121

2731

c.remove_from_connection()

2122

2732

# Don't signal anything except ClientRemoved

2123

2733

c.disable(quiet=True)

2128

2738

2129

2739

del _interface

2130

2740

2131

class MandosDBusServiceTransitional(MandosDBusService):

2132

__metaclass__ = AlternateDBusNamesMetaclass

2133

mandos_dbus_service = MandosDBusServiceTransitional()

2741

mandos_dbus_service = MandosDBusService()

2134

2742

2135

2743

def cleanup():

2136

2744

"Cleanup function; run on exit"

2137

2745

service.cleanup()

2138

2746

2139

2747

multiprocessing.active_children()

2748

wnull.close()

2749

if not (tcp_server.clients or client_settings):

2750

return

2751

2752

# Store client before exiting. Secrets are encrypted with key

2753

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

2754

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

2755

clients = {}

2756

with PGPEngine() as pgp:

2757

for client in tcp_server.clients.itervalues():

2758

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

2759

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

2760

key)

2761

client_dict = {}

2762

2763

# A list of attributes that can not be pickled

2764

# + secret.

2765

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

2766

"checker", "server_settings"))

2767

for name, typ in (inspect.getmembers

2768

(dbus.service.Object)):

2769

exclude.add(name)

2770

2771

client_dict["encrypted_secret"] = (client

2772

.encrypted_secret)

2773

for attr in client.client_structure:

2774

if attr not in exclude:

2775

client_dict[attr] = getattr(client, attr)

2776

2777

clients[client.name] = client_dict

2778

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

2779

2780

try:

2781

with (tempfile.NamedTemporaryFile

2782

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

2783

dir=os.path.dirname(stored_state_path),

2784

delete=False)) as stored_state:

2785

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

2786

tempname=stored_state.name

2787

os.rename(tempname, stored_state_path)

2788

except (IOError, OSError) as e:

2789

if not debug:

2790

try:

2791

os.remove(tempname)

2792

except NameError:

2793

pass

2794

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

2795

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

2796

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

2797

else:

2798

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

2799

exc_info=e)

2800

raise

2801

2802

# Delete all clients, and settings from config

2140

2803

while tcp_server.clients:

2141

client = tcp_server.clients.pop()

2804

name, client = tcp_server.clients.popitem()

2142

2805

if use_dbus:

2143

2806

client.remove_from_connection()

2144

client.disable_hook = None

2145

2807

# Don't signal anything except ClientRemoved

2146

2808

client.disable(quiet=True)

2147

2809

if use_dbus:

2149

2811

mandos_dbus_service.ClientRemoved(client

2150

2812

.dbus_object_path,

2151

2813

client.name)

2814

client_settings.clear()

2152

2815

2153

2816

atexit.register(cleanup)

2154

2817

2155

for client in tcp_server.clients:

2818

for client in tcp_server.clients.itervalues():

2156

2819

if use_dbus:

2157

2820

# Emit D-Bus signal

2158

2821

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2159

client.enable()

2822

# Need to initiate checking of clients

2823

if client.enabled:

2824

client.init_checker()

2160

2825

2161

2826

tcp_server.enable()

2162

2827

tcp_server.server_activate()

2165

2830

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

2166

2831

if use_ipv6:

2167

2832

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

2168

" flowinfo %d, scope_id %d"

2169

% tcp_server.socket.getsockname())

2833

" flowinfo %d, scope_id %d",

2834

*tcp_server.socket.getsockname())

2170

2835

else: # IPv4

2171

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

2172

% tcp_server.socket.getsockname())

2836

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

2837

*tcp_server.socket.getsockname())

2173

2838

2174

2839

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

2175

2840

2178

2843

try:

2179

2844

service.activate()

2180

2845

except dbus.exceptions.DBusException as error:

2181

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

2846

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

2182

2847

cleanup()

2183

2848

sys.exit(1)

2184

2849

# End of Avahi example code

2191

2856

logger.debug("Starting main loop")

2192

2857

main_loop.run()

2193

2858

except AvahiError as error:

2194

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

2859

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

2195

2860

cleanup()

2196

2861

sys.exit(1)

2197

2862

except KeyboardInterrupt:

2202

2867

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

2203

2868

cleanup()

2204

2869

2205

2206

2870

if __name__ == '__main__':

2207

2871

main()