/mandos/release : revision 237.16.24

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# "AvahiService" class, and some lines in "main".

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#

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# Everything else is

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#

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# This program is free software: you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import dbus

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import dbus.service

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.6.5"

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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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global syslogger

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syslogger = (logging.handlers.SysLogHandler

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(facility =

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logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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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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version = "1.4.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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.GetAlternativeServiceName(self.name))

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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return _timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return _timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return _timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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"""Construct a new dict of client settings of this form:

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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client["timeout"] = string_to_delta(section["timeout"])

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

332

return _timedelta_to_milliseconds(self.approval_delay)

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

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

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

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attribute."""

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self.name = name

535

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"):

546

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

547

+ self.timeout)

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else:

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self.last_enabled = None

550

self.expires = None

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if config is None:

340

config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

555

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# function

345

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

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.replace(" ", ""))

556

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

348

if "secret" in config:

349

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

350

elif "secfile" in config:

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

352

(config["secfile"])),

353

"rb") as secfile:

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self.secret = secfile.read()

355

else:

356

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

357

% self.name)

358

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

359

self.created = datetime.datetime.utcnow()

360

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"])

365

self.extended_timeout = string_to_delta(config

366

["extended_timeout"])

367

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

368

self.disable_hook = disable_hook

561

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self.checker = None

562

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self.checker_initiator_tag = None

563

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self.disable_initiator_tag = None

372

self.expires = None

564

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self.checker_callback_tag = None

374

self.checker_command = config["checker"]

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self.current_checker_command = None

566

self.approved = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

567

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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

570

387

.Lock()))

571

self.client_structure = [attr for attr in

572

self.__dict__.iterkeys()

573

if not attr.startswith("_")]

574

self.client_structure.append("client_structure")

575

576

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

577

lambda obj:

578

isinstance(obj,

579

property)):

580

if not name.startswith("_"):

581

self.client_structure.append(name)

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583

# Send notice to process children that client state has changed

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389

def send_changedstate(self):

585

with self.changedstate:

586

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

587

393

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def enable(self):

589

395

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

590

396

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

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397

# Already enabled

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398

return

593

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

594

self.enabled = True

595

self.last_enabled = datetime.datetime.utcnow()

596

self.init_checker()

597

399

self.send_changedstate()

598

599

def disable(self, quiet=True):

600

"""Disable this client."""

601

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

602

return False

603

if not quiet:

604

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

605

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

606

gobject.source_remove(self.disable_initiator_tag)

607

self.disable_initiator_tag = None

608

self.expires = None

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

610

gobject.source_remove(self.checker_initiator_tag)

611

self.checker_initiator_tag = None

612

self.stop_checker()

613

self.enabled = False

614

if not quiet:

615

self.send_changedstate()

616

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

617

return False

618

619

def __del__(self):

620

self.disable()

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622

def init_checker(self):

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400

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

624

401

# and every interval from then on.

625

if self.checker_initiator_tag is not None:

626

gobject.source_remove(self.checker_initiator_tag)

627

402

self.checker_initiator_tag = (gobject.timeout_add

628

403

(self.interval_milliseconds(),

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404

self.start_checker))

630

405

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

631

if self.disable_initiator_tag is not None:

632

gobject.source_remove(self.disable_initiator_tag)

406

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

633

407

self.disable_initiator_tag = (gobject.timeout_add

634

408

(self.timeout_milliseconds(),

635

409

self.disable))

410

self.enabled = True

411

self.last_enabled = datetime.datetime.utcnow()

636

412

# Also start a new checker *right now*.

637

413

self.start_checker()

638

414

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

639

441

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

640

442

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

641

443

self.checker_callback_tag = None

642

444

self.checker = None

643

445

if os.WIFEXITED(condition):

644

self.last_checker_status = os.WEXITSTATUS(condition)

645

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

646

448

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

647

449

vars(self))

648

450

self.checked_ok()

650

452

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

651

453

vars(self))

652

454

else:

653

self.last_checker_status = -1

654

455

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

655

456

vars(self))

656

457

657

def checked_ok(self):

658

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

659

self.last_checked_ok = datetime.datetime.utcnow()

660

self.last_checker_status = 0

661

self.bump_timeout()

662

663

def bump_timeout(self, timeout=None):

664

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

458

def checked_ok(self, timeout=None):

459

"""Bump up the timeout for this client.

460

461

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

462

alive and well.

463

"""

665

464

if timeout is None:

666

465

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

667

467

if self.disable_initiator_tag is not None:

668

468

gobject.source_remove(self.disable_initiator_tag)

669

self.disable_initiator_tag = None

670

469

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

671

470

self.disable_initiator_tag = (gobject.timeout_add

672

(timedelta_to_milliseconds

471

(_timedelta_to_milliseconds

673

472

(timeout), self.disable))

674

473

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

675

474

682

481

If a checker already exists, leave it running and do

683

482

nothing."""

684

483

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

685

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

686

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

687

# would inevitably timeout, since no checker would get a

688

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

484

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

485

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

486

# client would inevitably timeout, since no checker would get

487

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

689

488

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

690

489

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

691

490

# should be.

693

492

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

694

493

try:

695

494

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

696

except AttributeError:

697

pass

698

except OSError as error:

699

if error.errno != errno.ECHILD:

700

raise

495

except (AttributeError, OSError) as error:

496

if (isinstance(error, OSError)

497

and error.errno != errno.ECHILD):

498

raise error

701

499

else:

702

500

if pid:

703

501

logger.warning("Checker was a zombie")

706

504

self.current_checker_command)

707

505

# Start a new checker if needed

708

506

if self.checker is None:

709

# Escape attributes for the shell

710

escaped_attrs = dict(

711

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

712

for attr in

713

self.runtime_expansions)

714

507

try:

715

command = self.checker_command % escaped_attrs

716

except TypeError as error:

717

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

718

self.checker_command, exc_info=error)

719

return True # Try again later

508

# In case checker_command has exactly one % operator

509

command = self.checker_command % self.host

510

except TypeError:

511

# Escape attributes for the shell

512

escaped_attrs = dict(

513

(attr,

514

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

515

errors=

516

'replace')))

517

for attr in

518

self.runtime_expansions)

519

520

try:

521

command = self.checker_command % escaped_attrs

522

except TypeError as error:

523

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

524

' %s', self.checker_command, error)

525

return True # Try again later

720

526

self.current_checker_command = command

721

527

try:

722

528

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

725

531

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

726

532

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

727

533

# always replaced by /dev/null.)

728

# The exception is when not debugging but nevertheless

729

# running in the foreground; use the previously

730

# created wnull.

731

popen_args = {}

732

if (not self.server_settings["debug"]

733

and self.server_settings["foreground"]):

734

popen_args.update({"stdout": wnull,

735

"stderr": wnull })

736

534

self.checker = subprocess.Popen(command,

737

535

close_fds=True,

738

shell=True, cwd="/",

739

**popen_args)

740

except OSError as error:

741

logger.error("Failed to start subprocess",

742

exc_info=error)

743

return True

744

self.checker_callback_tag = (gobject.child_watch_add

745

(self.checker.pid,

746

self.checker_callback,

747

data=command))

748

# The checker may have completed before the gobject

749

# watch was added. Check for this.

750

try:

536

shell=True, cwd="/")

537

self.checker_callback_tag = (gobject.child_watch_add

538

(self.checker.pid,

539

self.checker_callback,

540

data=command))

541

# The checker may have completed before the gobject

542

# watch was added. Check for this.

751

543

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

544

if pid:

545

gobject.source_remove(self.checker_callback_tag)

546

self.checker_callback(pid, status, command)

752

547

except OSError as error:

753

if error.errno == errno.ECHILD:

754

# This should never happen

755

logger.error("Child process vanished",

756

exc_info=error)

757

return True

758

raise

759

if pid:

760

gobject.source_remove(self.checker_callback_tag)

761

self.checker_callback(pid, status, command)

548

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

549

error)

762

550

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

763

551

return True

764

552

771

559

return

772

560

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

773

561

try:

774

self.checker.terminate()

562

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

775

563

#time.sleep(0.5)

776

564

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

777

# self.checker.kill()

565

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

778

566

except OSError as error:

779

567

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

780

568

raise

797

585

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

798

586

if byte_arrays and signature != "ay":

799

587

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

800

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

588

" signature %r" % signature)

801

589

def decorator(func):

802

590

func._dbus_is_property = True

803

591

func._dbus_interface = dbus_interface

811

599

return decorator

812

600

813

601

814

def dbus_interface_annotations(dbus_interface):

815

"""Decorator for marking functions returning interface annotations

816

817

Usage:

818

819

@dbus_interface_annotations("org.example.Interface")

820

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

821

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

822

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

823

"false"}

824

"""

825

def decorator(func):

826

func._dbus_is_interface = True

827

func._dbus_interface = dbus_interface

828

func._dbus_name = dbus_interface

829

return func

830

return decorator

831

832

833

def dbus_annotations(annotations):

834

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

835

Usage:

836

837

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

838

access="r")

839

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

840

"org.freedesktop.DBus.Property."

841

"EmitsChangedSignal": "false"})

842

def Property_dbus_property(self):

843

return dbus.Boolean(False)

844

"""

845

def decorator(func):

846

func._dbus_annotations = annotations

847

return func

848

return decorator

849

850

851

602

class DBusPropertyException(dbus.exceptions.DBusException):

852

603

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

853

604

"""

876

627

"""

877

628

878

629

@staticmethod

879

def _is_dbus_thing(thing):

880

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

881

882

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

883

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

884

"""

885

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

886

False)

630

def _is_dbus_property(obj):

631

return getattr(obj, "_dbus_is_property", False)

887

632

888

def _get_all_dbus_things(self, thing):

633

def _get_all_dbus_properties(self):

889

634

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

890

635

"""

891

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

892

name),

893

athing.__get__(self))

636

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

894

637

for cls in self.__class__.__mro__

895

for name, athing in

896

inspect.getmembers(cls,

897

self._is_dbus_thing(thing)))

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

898

640

899

641

def _get_dbus_property(self, interface_name, property_name):

900

642

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

902

644

"""

903

645

for cls in self.__class__.__mro__:

904

646

for name, value in (inspect.getmembers

905

(cls,

906

self._is_dbus_thing("property"))):

647

(cls, self._is_dbus_property)):

907

648

if (value._dbus_name == property_name

908

649

and value._dbus_interface == interface_name):

909

650

return value.__get__(self)

937

678

# The byte_arrays option is not supported yet on

938

679

# signatures other than "ay".

939

680

if prop._dbus_signature != "ay":

940

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

941

"'ay' signature {0!r}"

942

.format(prop._dbus_signature))

943

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

944

for byte in value))

681

raise ValueError

682

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

683

for byte in value))

945

684

prop(value)

946

685

947

686

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

952

691

953

692

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

954

693

"""

955

properties = {}

956

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

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

957

696

if (interface_name

958

697

and interface_name != prop._dbus_interface):

959

698

# Interface non-empty but did not match

963

702

continue

964

703

value = prop()

965

704

if not hasattr(value, "variant_level"):

966

properties[name] = value

705

all[name] = value

967

706

continue

968

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

969

value.variant_level+1)

970

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

707

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

708

value.variant_level+1)

709

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

971

710

972

711

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

973

712

out_signature="s",

974

713

path_keyword='object_path',

975

714

connection_keyword='connection')

976

715

def Introspect(self, object_path, connection):

977

"""Overloading of standard D-Bus method.

978

979

Inserts property tags and interface annotation tags.

716

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

980

717

"""

981

718

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

982

719

connection)

989

726

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

990

727

return e

991

728

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

992

# Add property tags

993

729

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

994

730

for name, prop

995

in self._get_all_dbus_things("property")

731

in self._get_all_dbus_properties()

996

732

if prop._dbus_interface

997

733

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

998

734

if_tag.appendChild(tag)

999

# Add annotation tags

1000

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

1001

for tag in if_tag.getElementsByTagName(typ):

1002

annots = dict()

1003

for name, prop in (self.

1004

_get_all_dbus_things(typ)):

1005

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

1006

and prop._dbus_interface

1007

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

1008

annots.update(getattr

1009

(prop,

1010

"_dbus_annotations",

1011

{}))

1012

for name, value in annots.iteritems():

1013

ann_tag = document.createElement(

1014

"annotation")

1015

ann_tag.setAttribute("name", name)

1016

ann_tag.setAttribute("value", value)

1017

tag.appendChild(ann_tag)

1018

# Add interface annotation tags

1019

for annotation, value in dict(

1020

itertools.chain.from_iterable(

1021

annotations().iteritems()

1022

for name, annotations in

1023

self._get_all_dbus_things("interface")

1024

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

1025

)).iteritems():

1026

ann_tag = document.createElement("annotation")

1027

ann_tag.setAttribute("name", annotation)

1028

ann_tag.setAttribute("value", value)

1029

if_tag.appendChild(ann_tag)

1030

735

# Add the names to the return values for the

1031

736

# "org.freedesktop.DBus.Properties" methods

1032

737

if (if_tag.getAttribute("name")

1047

752

except (AttributeError, xml.dom.DOMException,

1048

753

xml.parsers.expat.ExpatError) as error:

1049

754

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

1050

exc_info=error)

755

error)

1051

756

return xmlstring

1052

757

1053

758

1054

def datetime_to_dbus(dt, variant_level=0):

759

def datetime_to_dbus (dt, variant_level=0):

1055

760

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

1056

761

if dt is None:

1057

762

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

1058

763

return dbus.String(dt.isoformat(),

1059

764

variant_level=variant_level)

1060

765

1061

1062

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1063

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

1064

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

1065

interface names according to the "alt_interface_names" mapping.

1066

Usage:

1067

1068

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

1069

"net.example.AlternateInterface"})

1070

class SampleDBusObject(dbus.service.Object):

1071

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

1072

def SampleDBusMethod():

1073

pass

1074

1075

The above "SampleDBusMethod" on "SampleDBusObject" will be

1076

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

1077

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

1078

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

1079

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

1080

1081

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

1082

(from DBusObjectWithProperties) and interfaces (from the

1083

dbus_interface_annotations decorator).

766

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

767

.__metaclass__):

768

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

769

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

1084

770

"""

1085

def wrapper(cls):

1086

for orig_interface_name, alt_interface_name in (

1087

alt_interface_names.iteritems()):

1088

attr = {}

1089

interface_names = set()

1090

# Go though all attributes of the class

1091

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

771

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

772

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

773

# methods, signals, or properties in them

774

for base in (b for b in bases

775

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

776

# Go though all attributes of the base class

777

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

1092

778

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

1093

779

# with the wrong interface name

1094

780

if (not hasattr(attribute, "_dbus_interface")

1095

781

or not attribute._dbus_interface

1096

.startswith(orig_interface_name)):

782

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

1097

783

continue

1098

784

# Create an alternate D-Bus interface name based on

1099

785

# the current name

1100

786

alt_interface = (attribute._dbus_interface

1101

.replace(orig_interface_name,

1102

alt_interface_name))

1103

interface_names.add(alt_interface)

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1104

789

# Is this a D-Bus signal?

1105

790

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

1106

# Extract the original non-method undecorated

1107

# function by black magic

791

# Extract the original non-method function by

792

# black magic

1108

793

nonmethod_func = (dict(

1109

794

zip(attribute.func_code.co_freevars,

1110

795

attribute.__closure__))["func"]

1121

806

nonmethod_func.func_name,

1122

807

nonmethod_func.func_defaults,

1123

808

nonmethod_func.func_closure)))

1124

# Copy annotations, if any

1125

try:

1126

new_function._dbus_annotations = (

1127

dict(attribute._dbus_annotations))

1128

except AttributeError:

1129

pass

1130

809

# Define a creator of a function to call both the

1131

# original and alternate functions, so both the

1132

# original and alternate signals gets sent when

1133

# the function is called

810

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

811

# signals gets sent when the function is called

1134

812

def fixscope(func1, func2):

1135

813

"""This function is a scope container to pass

1136

814

func1 and func2 to the "call_both" function

1143

821

return call_both

1144

822

# Create the "call_both" function and add it to

1145

823

# the class

1146

attr[attrname] = fixscope(attribute, new_function)

824

attr[attrname] = fixscope(attribute,

825

new_function)

1147

826

# Is this a D-Bus method?

1148

827

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

1149

828

# Create a new, but exactly alike, function

1160

839

attribute.func_name,

1161

840

attribute.func_defaults,

1162

841

attribute.func_closure)))

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1169

842

# Is this a D-Bus property?

1170

843

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

1171

844

# Create a new, but exactly alike, function

1185

858

attribute.func_name,

1186

859

attribute.func_defaults,

1187

860

attribute.func_closure)))

1188

# Copy annotations, if any

1189

try:

1190

attr[attrname]._dbus_annotations = (

1191

dict(attribute._dbus_annotations))

1192

except AttributeError:

1193

pass

1194

# Is this a D-Bus interface?

1195

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

1196

# Create a new, but exactly alike, function

1197

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

1198

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

1199

# to the class.

1200

attr[attrname] = (dbus_interface_annotations

1201

(alt_interface)

1202

(types.FunctionType

1203

(attribute.func_code,

1204

attribute.func_globals,

1205

attribute.func_name,

1206

attribute.func_defaults,

1207

attribute.func_closure)))

1208

if deprecate:

1209

# Deprecate all alternate interfaces

1210

iname="_AlternateDBusNames_interface_annotation{0}"

1211

for interface_name in interface_names:

1212

@dbus_interface_annotations(interface_name)

1213

def func(self):

1214

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

1215

"true" }

1216

# Find an unused name

1217

for aname in (iname.format(i)

1218

for i in itertools.count()):

1219

if aname not in attr:

1220

attr[aname] = func

1221

break

1222

if interface_names:

1223

# Replace the class with a new subclass of it with

1224

# methods, signals, etc. as created above.

1225

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

1226

(cls,), attr)

1227

return cls

1228

return wrapper

1229

1230

1231

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

1232

"se.bsnet.fukt.Mandos"})

861

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

862

1233

863

class ClientDBus(Client, DBusObjectWithProperties):

1234

864

"""A Client class using D-Bus

1235

865

1244

874

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

1245

875

1246

876

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

877

self._approvals_pending = 0

1247

878

self.bus = bus

1248

879

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

1249

880

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

1255

886

("/clients/" + client_object_name))

1256

887

DBusObjectWithProperties.__init__(self, self.bus,

1257

888

self.dbus_object_path)

1258

889

1259

890

def notifychangeproperty(transform_func,

1260

891

dbus_name, type_func=lambda x: x,

1261

892

variant_level=1):

1262

893

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

1263

894

its changes to DBus.

1264

895

1265

896

transform_fun: Function that takes a value and a variant_level

1266

897

and transforms it to a D-Bus type.

1267

898

dbus_name: D-Bus name of the variable

1284

915

1285

916

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

1286

917

918

1287

919

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1288

920

approvals_pending = notifychangeproperty(dbus.Boolean,

1289

921

"ApprovalPending",

1296

928

checker is not None)

1297

929

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1298

930

"LastCheckedOK")

1299

last_checker_status = notifychangeproperty(dbus.Int16,

1300

"LastCheckerStatus")

1301

931

last_approval_request = notifychangeproperty(

1302

932

datetime_to_dbus, "LastApprovalRequest")

1303

933

approved_by_default = notifychangeproperty(dbus.Boolean,

1304

934

"ApprovedByDefault")

1305

approval_delay = notifychangeproperty(dbus.UInt64,

935

approval_delay = notifychangeproperty(dbus.UInt16,

1306

936

"ApprovalDelay",

1307

937

type_func =

1308

timedelta_to_milliseconds)

938

_timedelta_to_milliseconds)

1309

939

approval_duration = notifychangeproperty(

1310

dbus.UInt64, "ApprovalDuration",

1311

type_func = timedelta_to_milliseconds)

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1312

942

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

1313

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

943

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

1314

944

type_func =

1315

timedelta_to_milliseconds)

945

_timedelta_to_milliseconds)

1316

946

extended_timeout = notifychangeproperty(

1317

dbus.UInt64, "ExtendedTimeout",

1318

type_func = timedelta_to_milliseconds)

1319

interval = notifychangeproperty(dbus.UInt64,

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1320

950

"Interval",

1321

951

type_func =

1322

timedelta_to_milliseconds)

952

_timedelta_to_milliseconds)

1323

953

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

1324

954

1325

955

del notifychangeproperty

1353

983

*args, **kwargs)

1354

984

1355

985

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

1356

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

986

old_checker = self.checker

987

if self.checker is not None:

988

old_checker_pid = self.checker.pid

989

else:

990

old_checker_pid = None

1357

991

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

1358

992

# Only if new checker process was started

1359

993

if (self.checker is not None

1363

997

return r

1364

998

1365

999

def _reset_approved(self):

1366

self.approved = None

1000

self._approved = None

1367

1001

return False

1368

1002

1369

1003

def approve(self, value=True):

1370

self.approved = value

1371

gobject.timeout_add(timedelta_to_milliseconds

1004

self.send_changedstate()

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1372

1007

(self.approval_duration),

1373

1008

self._reset_approved)

1374

self.send_changedstate()

1009

1375

1010

1376

1011

## D-Bus methods, signals & properties

1377

1012

_interface = "se.recompile.Mandos.Client"

1378

1013

1379

## Interfaces

1380

1381

@dbus_interface_annotations(_interface)

1382

def _foo(self):

1383

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

1384

"false"}

1385

1386

1014

## Signals

1387

1015

1388

1016

# CheckerCompleted - signal

1487

1115

access="readwrite")

1488

1116

def ApprovalDuration_dbus_property(self, value=None):

1489

1117

if value is None: # get

1490

return dbus.UInt64(timedelta_to_milliseconds(

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1491

1119

self.approval_duration))

1492

1120

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

1493

1121

1507

1135

def Host_dbus_property(self, value=None):

1508

1136

if value is None: # get

1509

1137

return dbus.String(self.host)

1510

self.host = unicode(value)

1138

self.host = value

1511

1139

1512

1140

# Created - property

1513

1141

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

1514

1142

def Created_dbus_property(self):

1515

return datetime_to_dbus(self.created)

1143

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

1516

1144

1517

1145

# LastEnabled - property

1518

1146

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

1539

1167

return

1540

1168

return datetime_to_dbus(self.last_checked_ok)

1541

1169

1542

# LastCheckerStatus - property

1543

@dbus_service_property(_interface, signature="n",

1544

access="read")

1545

def LastCheckerStatus_dbus_property(self):

1546

return dbus.Int16(self.last_checker_status)

1547

1548

1170

# Expires - property

1549

1171

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

1550

1172

def Expires_dbus_property(self):

1561

1183

def Timeout_dbus_property(self, value=None):

1562

1184

if value is None: # get

1563

1185

return dbus.UInt64(self.timeout_milliseconds())

1564

old_timeout = self.timeout

1565

1186

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

1566

# Reschedule disabling

1567

if self.enabled:

1568

now = datetime.datetime.utcnow()

1569

self.expires += self.timeout - old_timeout

1570

if self.expires <= now:

1571

# The timeout has passed

1572

self.disable()

1573

else:

1574

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

1575

is None):

1576

return

1577

gobject.source_remove(self.disable_initiator_tag)

1578

self.disable_initiator_tag = (

1579

gobject.timeout_add(

1580

timedelta_to_milliseconds(self.expires - now),

1581

self.disable))

1187

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

1188

return

1189

# Reschedule timeout

1190

gobject.source_remove(self.disable_initiator_tag)

1191

self.disable_initiator_tag = None

1192

self.expires = None

1193

time_to_die = _timedelta_to_milliseconds((self

1194

.last_checked_ok

1195

+ self.timeout)

1196

- datetime.datetime

1197

.utcnow())

1198

if time_to_die <= 0:

1199

# The timeout has passed

1200

self.disable()

1201

else:

1202

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

1203

+ datetime.timedelta(milliseconds =

1204

time_to_die))

1205

self.disable_initiator_tag = (gobject.timeout_add

1206

(time_to_die, self.disable))

1582

1207

1583

1208

# ExtendedTimeout - property

1584

1209

@dbus_service_property(_interface, signature="t",

1597

1222

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

1598

1223

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

1599

1224

return

1600

if self.enabled:

1601

# Reschedule checker run

1602

gobject.source_remove(self.checker_initiator_tag)

1603

self.checker_initiator_tag = (gobject.timeout_add

1604

(value, self.start_checker))

1605

self.start_checker() # Start one now, too

1225

# Reschedule checker run

1226

gobject.source_remove(self.checker_initiator_tag)

1227

self.checker_initiator_tag = (gobject.timeout_add

1228

(value, self.start_checker))

1229

self.start_checker() # Start one now, too

1606

1230

1607

1231

# Checker - property

1608

1232

@dbus_service_property(_interface, signature="s",

1610

1234

def Checker_dbus_property(self, value=None):

1611

1235

if value is None: # get

1612

1236

return dbus.String(self.checker_command)

1613

self.checker_command = unicode(value)

1237

self.checker_command = value

1614

1238

1615

1239

# CheckerRunning - property

1616

1240

@dbus_service_property(_interface, signature="b",

1645

1269

raise KeyError()

1646

1270

1647

1271

def __getattribute__(self, name):

1648

if name == '_pipe':

1272

if(name == '_pipe'):

1649

1273

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

1650

1274

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

1651

1275

data = self._pipe.recv()

1658

1282

return func

1659

1283

1660

1284

def __setattr__(self, name, value):

1661

if name == '_pipe':

1285

if(name == '_pipe'):

1662

1286

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

1663

1287

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

1664

1288

1289

class ClientDBusTransitional(ClientDBus):

1290

__metaclass__ = AlternateDBusNamesMetaclass

1665

1291

1666

1292

class ClientHandler(socketserver.BaseRequestHandler, object):

1667

1293

"""A class to handle client connections.

1704

1330

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

1705

1331

try:

1706

1332

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

1707

raise RuntimeError(line)

1333

raise RuntimeError

1708

1334

except (ValueError, IndexError, RuntimeError) as error:

1709

1335

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

1710

1336

return

1750

1376

client.Rejected("Disabled")

1751

1377

return

1752

1378

1753

if client.approved or not client.approval_delay:

1379

if client._approved or not client.approval_delay:

1754

1380

#We are approved or approval is disabled

1755

1381

break

1756

elif client.approved is None:

1382

elif client._approved is None:

1757

1383

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

1758

1384

client.name)

1759

1385

if self.server.use_dbus:

1772

1398

#wait until timeout or approved

1773

1399

time = datetime.datetime.now()

1774

1400

client.changedstate.acquire()

1775

client.changedstate.wait(

1776

float(timedelta_to_milliseconds(delay)

1777

/ 1000))

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1778

1404

client.changedstate.release()

1779

1405

time2 = datetime.datetime.now()

1780

1406

if (time2 - time) >= delay:

1796

1422

try:

1797

1423

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

1798

1424

except gnutls.errors.GNUTLSError as error:

1799

logger.warning("gnutls send failed",

1800

exc_info=error)

1425

logger.warning("gnutls send failed")

1801

1426

return

1802

1427

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

1803

1428

sent, len(client.secret)

1806

1431

1807

1432

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

1808

1433

# bump the timeout using extended_timeout

1809

client.bump_timeout(client.extended_timeout)

1434

client.checked_ok(client.extended_timeout)

1810

1435

if self.server.use_dbus:

1811

1436

# Emit D-Bus signal

1812

1437

client.GotSecret()

1817

1442

try:

1818

1443

session.bye()

1819

1444

except gnutls.errors.GNUTLSError as error:

1820

logger.warning("GnuTLS bye failed",

1821

exc_info=error)

1445

logger.warning("GnuTLS bye failed")

1822

1446

1823

1447

@staticmethod

1824

1448

def peer_certificate(session):

1880

1504

# Convert the buffer to a Python bytestring

1881

1505

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

1882

1506

# Convert the bytestring to hexadecimal notation

1883

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

1507

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

1884

1508

return hex_fpr

1885

1509

1886

1510

1889

1513

def sub_process_main(self, request, address):

1890

1514

try:

1891

1515

self.finish_request(request, address)

1892

except Exception:

1516

except:

1893

1517

self.handle_error(request, address)

1894

1518

self.close_request(request)

1895

1519

1896

1520

def process_request(self, request, address):

1897

1521

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

1898

1522

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

1899

args = (request, address))

1523

args = (request,

1524

address))

1900

1525

proc.start()

1901

1526

return proc

1902

1527

1917

1542

1918

1543

def add_pipe(self, parent_pipe, proc):

1919

1544

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

1920

raise NotImplementedError()

1545

raise NotImplementedError

1921

1546

1922

1547

1923

1548

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1930

1555

use_ipv6: Boolean; to use IPv6 or not

1931

1556

"""

1932

1557

def __init__(self, server_address, RequestHandlerClass,

1933

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

1934

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

1935

creating a new one with socket.socket().

1936

"""

1558

interface=None, use_ipv6=True):

1937

1559

self.interface = interface

1938

1560

if use_ipv6:

1939

1561

self.address_family = socket.AF_INET6

1940

if socketfd is not None:

1941

# Save the file descriptor

1942

self.socketfd = socketfd

1943

# Save the original socket.socket() function

1944

self.socket_socket = socket.socket

1945

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

1946

#

1947

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

1948

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

1949

# patching socket.socket.)

1950

#

1951

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

1952

@functools.wraps(socket.socket)

1953

def socket_wrapper(*args, **kwargs):

1954

# Restore original function so subsequent calls are

1955

# not affected.

1956

socket.socket = self.socket_socket

1957

del self.socket_socket

1958

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

1959

# saved file descriptor.

1960

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

1961

# Replace socket.socket() function with wrapper

1962

socket.socket = socket_wrapper

1963

# The socketserver.TCPServer.__init__ will call

1964

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

1965

# socket_wrapper(), if socketfd was set.

1966

1562

socketserver.TCPServer.__init__(self, server_address,

1967

1563

RequestHandlerClass)

1968

1969

1564

def server_bind(self):

1970

1565

"""This overrides the normal server_bind() function

1971

1566

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

1979

1574

try:

1980

1575

self.socket.setsockopt(socket.SOL_SOCKET,

1981

1576

SO_BINDTODEVICE,

1982

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

1577

str(self.interface

1578

+ '\0'))

1983

1579

except socket.error as error:

1984

if error.errno == errno.EPERM:

1985

logger.error("No permission to bind to"

1986

" interface %s", self.interface)

1987

elif error.errno == errno.ENOPROTOOPT:

1580

if error[0] == errno.EPERM:

1581

logger.error("No permission to"

1582

" bind to interface %s",

1583

self.interface)

1584

elif error[0] == errno.ENOPROTOOPT:

1988

1585

logger.error("SO_BINDTODEVICE not available;"

1989

1586

" cannot bind to interface %s",

1990

1587

self.interface)

1991

elif error.errno == errno.ENODEV:

1992

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

1993

" cannot bind", self.interface)

1994

1588

else:

1995

1589

raise

1996

1590

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

1999

1593

if self.address_family == socket.AF_INET6:

2000

1594

any_address = "::" # in6addr_any

2001

1595

else:

2002

any_address = "0.0.0.0" # INADDR_ANY

1596

any_address = socket.INADDR_ANY

2003

1597

self.server_address = (any_address,

2004

1598

self.server_address[1])

2005

1599

elif not self.server_address[1]:

2026

1620

"""

2027

1621

def __init__(self, server_address, RequestHandlerClass,

2028

1622

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

2029

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

1623

gnutls_priority=None, use_dbus=True):

2030

1624

self.enabled = False

2031

1625

self.clients = clients

2032

1626

if self.clients is None:

2033

self.clients = {}

1627

self.clients = set()

2034

1628

self.use_dbus = use_dbus

2035

1629

self.gnutls_priority = gnutls_priority

2036

1630

IPv6_TCPServer.__init__(self, server_address,

2037

1631

RequestHandlerClass,

2038

1632

interface = interface,

2039

use_ipv6 = use_ipv6,

2040

socketfd = socketfd)

1633

use_ipv6 = use_ipv6)

2041

1634

def server_activate(self):

2042

1635

if self.enabled:

2043

1636

return socketserver.TCPServer.server_activate(self)

2056

1649

2057

1650

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

2058

1651

proc = None, client_object=None):

1652

condition_names = {

1653

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

1654

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

1655

# blocking).

1656

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

1657

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

1658

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

1659

# broken, usually for pipes and

1660

# sockets).

1661

}

1662

conditions_string = ' | '.join(name

1663

for cond, name in

1664

condition_names.iteritems()

1665

if cond & condition)

2059

1666

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

2060

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

1667

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

2061

1668

# Wait for other process to exit

2062

1669

proc.join()

2063

1670

return False

2070

1677

fpr = request[1]

2071

1678

address = request[2]

2072

1679

2073

for c in self.clients.itervalues():

1680

for c in self.clients:

2074

1681

if c.fingerprint == fpr:

2075

1682

client = c

2076

1683

break

2121

1728

return True

2122

1729

2123

1730

2124

def rfc3339_duration_to_delta(duration):

2125

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

2126

2127

>>> rfc3339_duration_to_delta("P7D")

2128

datetime.timedelta(7)

2129

>>> rfc3339_duration_to_delta("PT60S")

2130

datetime.timedelta(0, 60)

2131

>>> rfc3339_duration_to_delta("PT60M")

2132

datetime.timedelta(0, 3600)

2133

>>> rfc3339_duration_to_delta("PT24H")

2134

datetime.timedelta(1)

2135

>>> rfc3339_duration_to_delta("P1W")

2136

datetime.timedelta(7)

2137

>>> rfc3339_duration_to_delta("PT5M30S")

2138

datetime.timedelta(0, 330)

2139

>>> rfc3339_duration_to_delta("P1DT3M20S")

2140

datetime.timedelta(1, 200)

2141

"""

2142

2143

# Parsing an RFC 3339 duration with regular expressions is not

2144

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

2145

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

2146

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

2147

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

2148

# avoid excessive use of external libraries.

2149

2150

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

2151

Token = collections.namedtuple("Token",

2152

("regexp", # To match token; if

2153

# "value" is not None,

2154

# must have a "group"

2155

# containing digits

2156

"value", # datetime.timedelta or

2157

# None

2158

"followers")) # Tokens valid after

2159

# this token

2160

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

2161

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

2162

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

2163

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

2164

datetime.timedelta(seconds=1),

2165

frozenset((token_end,)))

2166

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

2167

datetime.timedelta(minutes=1),

2168

frozenset((token_second, token_end)))

2169

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

2170

datetime.timedelta(hours=1),

2171

frozenset((token_minute, token_end)))

2172

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

2173

None,

2174

frozenset((token_hour, token_minute,

2175

token_second)))

2176

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

2177

datetime.timedelta(days=1),

2178

frozenset((token_time, token_end)))

2179

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

2180

datetime.timedelta(weeks=4),

2181

frozenset((token_day, token_end)))

2182

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

2183

datetime.timedelta(weeks=52),

2184

frozenset((token_month, token_end)))

2185

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

2186

datetime.timedelta(weeks=1),

2187

frozenset((token_end,)))

2188

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

2189

frozenset((token_year, token_month,

2190

token_day, token_time,

2191

token_week))),

2192

# Define starting values

2193

value = datetime.timedelta() # Value so far

2194

found_token = None

2195

followers = frozenset(token_duration,) # Following valid tokens

2196

s = duration # String left to parse

2197

# Loop until end token is found

2198

while found_token is not token_end:

2199

# Search for any currently valid tokens

2200

for token in followers:

2201

match = token.regexp.match(s)

2202

if match is not None:

2203

# Token found

2204

if token.value is not None:

2205

# Value found, parse digits

2206

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

2207

# Add to value so far

2208

value += factor * token.value

2209

# Strip token from string

2210

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

2211

# Go to found token

2212

found_token = token

2213

# Set valid next tokens

2214

followers = found_token.followers

2215

break

2216

else:

2217

# No currently valid tokens were found

2218

raise ValueError("Invalid RFC 3339 duration")

2219

# End token found

2220

return value

2221

2222

2223

1731

def string_to_delta(interval):

2224

1732

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

2225

1733

2236

1744

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

2237

1745

datetime.timedelta(0, 330)

2238

1746

"""

2239

2240

try:

2241

return rfc3339_duration_to_delta(interval)

2242

except ValueError:

2243

pass

2244

2245

1747

timevalue = datetime.timedelta(0)

2246

1748

for s in interval.split():

2247

1749

try:

2258

1760

elif suffix == "w":

2259

1761

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

2260

1762

else:

2261

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

2262

.format(suffix))

2263

except IndexError as e:

1763

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

1764

except (ValueError, IndexError) as e:

2264

1765

raise ValueError(*(e.args))

2265

1766

timevalue += delta

2266

1767

return timevalue

2267

1768

2268

1769

1770

def if_nametoindex(interface):

1771

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

1772

1773

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

1774

global if_nametoindex

1775

try:

1776

if_nametoindex = (ctypes.cdll.LoadLibrary

1777

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

1778

.if_nametoindex)

1779

except (OSError, AttributeError):

1780

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

1781

def if_nametoindex(interface):

1782

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

1783

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

1784

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

1785

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1786

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

1787

interface))

1788

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

1789

ifreq[16:20])[0]

1790

return interface_index

1791

return if_nametoindex(interface)

1792

1793

2269

1794

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

2270

1795

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

2271

1796

2279

1804

sys.exit()

2280

1805

if not noclose:

2281

1806

# Close all standard open file descriptors

2282

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

1807

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

2283

1808

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

2284

1809

raise OSError(errno.ENODEV,

2285

"{0} not a character device"

2286

.format(os.devnull))

1810

"%s not a character device"

1811

% os.path.devnull)

2287

1812

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

2288

1813

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

2289

1814

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

2298

1823

2299

1824

parser = argparse.ArgumentParser()

2300

1825

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

2301

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

1826

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

2302

1827

help="show version number and exit")

2303

1828

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

2304

1829

help="Bind to interface IF")

2310

1835

help="Run self-test")

2311

1836

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

2312

1837

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

2313

" to terminal", default=None)

1838

" to terminal")

2314

1839

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

2315

1840

help="Debug level for stdout output")

2316

1841

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

2323

1848

" files")

2324

1849

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

2325

1850

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

2326

" system bus interface", default=None)

1851

" system bus interface")

2327

1852

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

2328

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

2329

default=None)

2330

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

2331

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

2332

" state", default=None)

2333

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

2334

help="Specify a file descriptor to a network"

2335

" socket to use instead of creating one")

2336

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

2337

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

2338

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

2339

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

2340

1853

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

2341

1854

options = parser.parse_args()

2342

1855

2343

1856

if options.check:

2344

1857

import doctest

2345

fail_count, test_count = doctest.testmod()

2346

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

1858

doctest.testmod()

1859

sys.exit()

2347

1860

2348

1861

# Default values for config file for server-global settings

2349

1862

server_defaults = { "interface": "",

2351

1864

"port": "",

2352

1865

"debug": "False",

2353

1866

"priority":

2354

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

1867

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

2355

1868

"servicename": "Mandos",

2356

1869

"use_dbus": "True",

2357

1870

"use_ipv6": "True",

2358

1871

"debuglevel": "",

2359

"restore": "True",

2360

"socket": "",

2361

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

2362

"foreground": "False",

2363

1872

}

2364

1873

2365

1874

# Parse config file for server-global settings

2370

1879

# Convert the SafeConfigParser object to a dict

2371

1880

server_settings = server_config.defaults()

2372

1881

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

2373

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

1882

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

2374

1883

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

2375

1884

option)

2376

1885

if server_settings["port"]:

2377

1886

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

2378

1887

"port")

2379

if server_settings["socket"]:

2380

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

2381

"socket")

2382

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

2383

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

2384

# happen with a supplied network socket.

2385

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

2386

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

2387

["socket"])

2388

1888

del server_config

2389

1889

2390

1890

# Override the settings from the config file with command line

2391

1891

# options, if set.

2392

1892

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

2393

1893

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

2394

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

2395

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

1894

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

2396

1895

value = getattr(options, option)

2397

1896

if value is not None:

2398

1897

server_settings[option] = value

2401

1900

for option in server_settings.keys():

2402

1901

if type(server_settings[option]) is str:

2403

1902

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

2404

# Force all boolean options to be boolean

2405

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

2406

"foreground"):

2407

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

2408

# Debug implies foreground

2409

if server_settings["debug"]:

2410

server_settings["foreground"] = True

2411

1903

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

2412

1904

2413

1905

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

2417

1909

debuglevel = server_settings["debuglevel"]

2418

1910

use_dbus = server_settings["use_dbus"]

2419

1911

use_ipv6 = server_settings["use_ipv6"]

2420

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

2421

stored_state_file)

2422

foreground = server_settings["foreground"]

2423

2424

if debug:

2425

initlogger(debug, logging.DEBUG)

2426

else:

2427

if not debuglevel:

2428

initlogger(debug)

2429

else:

2430

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

2431

initlogger(debug, level)

2432

1912

2433

1913

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

2434

1914

syslogger.setFormatter(logging.Formatter

2435

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

2436

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

2437

.format(server_settings

2438

["servicename"])))

1915

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

1916

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

1917

% server_settings["servicename"]))

2439

1918

2440

1919

# Parse config file with clients

2441

client_config = configparser.SafeConfigParser(Client

2442

.client_defaults)

1920

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

1921

"extended_timeout": "15m",

1922

"interval": "2m",

1923

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

1924

"host": "",

1925

"approval_delay": "0s",

1926

"approval_duration": "1s",

1927

}

1928

client_config = configparser.SafeConfigParser(client_defaults)

2443

1929

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

2444

1930

"clients.conf"))

2445

1931

2454

1940

use_ipv6=use_ipv6,

2455

1941

gnutls_priority=

2456

1942

server_settings["priority"],

2457

use_dbus=use_dbus,

2458

socketfd=(server_settings["socket"]

2459

or None))

2460

if not foreground:

2461

pidfilename = "/run/mandos.pid"

2462

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

2463

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

2464

pidfile = None

1943

use_dbus=use_dbus)

1944

if not debug:

1945

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

2465

1946

try:

2466

1947

pidfile = open(pidfilename, "w")

2467

except IOError as e:

2468

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

2469

exc_info=e)

1948

except IOError:

1949

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

2470

1950

2471

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

1951

try:

1952

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

1953

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

1954

except KeyError:

2472

1955

try:

2473

uid = pwd.getpwnam(name).pw_uid

2474

gid = pwd.getpwnam(name).pw_gid

2475

break

1956

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

1957

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

2476

1958

except KeyError:

2477

continue

2478

else:

2479

uid = 65534

2480

gid = 65534

1959

try:

1960

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

1961

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

1962

except KeyError:

1963

uid = 65534

1964

gid = 65534

2481

1965

try:

2482

1966

os.setgid(gid)

2483

1967

os.setuid(uid)

2484

1968

except OSError as error:

2485

if error.errno != errno.EPERM:

2486

raise

1969

if error[0] != errno.EPERM:

1970

raise error

1971

1972

if not debug and not debuglevel:

1973

syslogger.setLevel(logging.WARNING)

1974

console.setLevel(logging.WARNING)

1975

if debuglevel:

1976

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

1977

syslogger.setLevel(level)

1978

console.setLevel(level)

2487

1979

2488

1980

if debug:

2489

1981

# Enable all possible GnuTLS debugging

2500

1992

.gnutls_global_set_log_function(debug_gnutls))

2501

1993

2502

1994

# Redirect stdin so all checkers get /dev/null

2503

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

1995

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

2504

1996

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

2505

1997

if null > 2:

2506

1998

os.close(null)

1999

else:

2000

# No console logging

2001

logger.removeHandler(console)

2507

2002

2508

2003

# Need to fork before connecting to D-Bus

2509

if not foreground:

2004

if not debug:

2510

2005

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

2511

2006

daemon()

2512

2007

2513

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

2514

# need to inform gobject that threads will be used.

2515

gobject.threads_init()

2516

2517

2008

global main_loop

2518

2009

# From the Avahi example code

2519

DBusGMainLoop(set_as_default=True)

2010

DBusGMainLoop(set_as_default=True )

2520

2011

main_loop = gobject.MainLoop()

2521

2012

bus = dbus.SystemBus()

2522

2013

# End of Avahi example code

2528

2019

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

2529

2020

do_not_queue=True))

2530

2021

except dbus.exceptions.NameExistsException as e:

2531

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

2022

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

2532

2023

use_dbus = False

2533

2024

server_settings["use_dbus"] = False

2534

2025

tcp_server.use_dbus = False

2535

2026

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2536

service = AvahiServiceToSyslog(name =

2537

server_settings["servicename"],

2538

servicetype = "_mandos._tcp",

2539

protocol = protocol, bus = bus)

2027

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

2028

servicetype = "_mandos._tcp",

2029

protocol = protocol, bus = bus)

2540

2030

if server_settings["interface"]:

2541

2031

service.interface = (if_nametoindex

2542

2032

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

2546

2036

2547

2037

client_class = Client

2548

2038

if use_dbus:

2549

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

2550

2551

client_settings = Client.config_parser(client_config)

2552

old_client_settings = {}

2553

clients_data = {}

2554

2555

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

2556

global wnull

2557

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

2558

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

2559

# mode

2560

if debug or not foreground:

2561

wnull.close()

2562

2563

# Get client data and settings from last running state.

2564

if server_settings["restore"]:

2565

try:

2566

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

2567

clients_data, old_client_settings = (pickle.load

2568

(stored_state))

2569

os.remove(stored_state_path)

2570

except IOError as e:

2571

if e.errno == errno.ENOENT:

2572

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

2573

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

2574

else:

2575

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

2576

exc_info=e)

2577

raise

2578

except EOFError as e:

2579

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

2580

"EOFError:", exc_info=e)

2581

2582

with PGPEngine() as pgp:

2583

for client_name, client in clients_data.iteritems():

2584

# Skip removed clients

2585

if client_name not in client_settings:

2586

continue

2587

2588

# Decide which value to use after restoring saved state.

2589

# We have three different values: Old config file,

2590

# new config file, and saved state.

2591

# New config value takes precedence if it differs from old

2592

# config value, otherwise use saved state.

2593

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

2594

try:

2595

# For each value in new config, check if it

2596

# differs from the old config value (Except for

2597

# the "secret" attribute)

2598

if (name != "secret" and

2599

value != old_client_settings[client_name]

2600

[name]):

2601

client[name] = value

2602

except KeyError:

2603

pass

2604

2605

# Clients who has passed its expire date can still be

2606

# enabled if its last checker was successful. Clients

2607

# whose checker succeeded before we stored its state is

2608

# assumed to have successfully run all checkers during

2609

# downtime.

2610

if client["enabled"]:

2611

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

2612

if not client["last_checked_ok"]:

2613

logger.warning(

2614

"disabling client {0} - Client never "

2615

"performed a successful checker"

2616

.format(client_name))

2617

client["enabled"] = False

2618

elif client["last_checker_status"] != 0:

2619

logger.warning(

2620

"disabling client {0} - Client "

2621

"last checker failed with error code {1}"

2622

.format(client_name,

2623

client["last_checker_status"]))

2624

client["enabled"] = False

2625

else:

2626

client["expires"] = (datetime.datetime

2627

.utcnow()

2628

+ client["timeout"])

2629

logger.debug("Last checker succeeded,"

2630

" keeping {0} enabled"

2631

.format(client_name))

2039

client_class = functools.partial(ClientDBusTransitional,

2040

bus = bus)

2041

def client_config_items(config, section):

2042

special_settings = {

2043

"approved_by_default":

2044

lambda: config.getboolean(section,

2045

"approved_by_default"),

2046

}

2047

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

2632

2048

try:

2633

client["secret"] = (

2634

pgp.decrypt(client["encrypted_secret"],

2635

client_settings[client_name]

2636

["secret"]))

2637

except PGPError:

2638

# If decryption fails, we use secret from new settings

2639

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

2640

.format(client_name))

2641

client["secret"] = (

2642

client_settings[client_name]["secret"])

2643

2644

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

2645

for client_name in (set(old_client_settings)

2646

- set(client_settings)):

2647

del clients_data[client_name]

2648

for client_name in (set(client_settings)

2649

- set(old_client_settings)):

2650

clients_data[client_name] = client_settings[client_name]

2651

2652

# Create all client objects

2653

for client_name, client in clients_data.iteritems():

2654

tcp_server.clients[client_name] = client_class(

2655

name = client_name, settings = client,

2656

server_settings = server_settings)

2657

2049

yield (name, special_settings[name]())

2050

except KeyError:

2051

yield (name, value)

2052

2053

tcp_server.clients.update(set(

2054

client_class(name = section,

2055

config= dict(client_config_items(

2056

client_config, section)))

2057

for section in client_config.sections()))

2658

2058

if not tcp_server.clients:

2659

2059

logger.warning("No clients defined")

2660

2661

if not foreground:

2662

if pidfile is not None:

2663

try:

2664

with pidfile:

2665

pid = os.getpid()

2666

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

2667

except IOError:

2668

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

2669

pidfilename, pid)

2670

del pidfile

2060

2061

if not debug:

2062

try:

2063

with pidfile:

2064

pid = os.getpid()

2065

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

2066

del pidfile

2067

except IOError:

2068

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

2069

pidfilename, pid)

2070

except NameError:

2071

# "pidfile" was never created

2072

pass

2671

2073

del pidfilename

2074

2075

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

2672

2076

2673

2077

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

2674

2078

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

2675

2079

2676

2080

if use_dbus:

2677

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

2678

"se.bsnet.fukt.Mandos"})

2679

class MandosDBusService(DBusObjectWithProperties):

2081

class MandosDBusService(dbus.service.Object):

2680

2082

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

2681

2083

def __init__(self):

2682

2084

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

2683

2085

_interface = "se.recompile.Mandos"

2684

2086

2685

@dbus_interface_annotations(_interface)

2686

def _foo(self):

2687

return { "org.freedesktop.DBus.Property"

2688

".EmitsChangedSignal":

2689

"false"}

2690

2691

2087

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

2692

2088

def ClientAdded(self, objpath):

2693

2089

"D-Bus signal"

2707

2103

def GetAllClients(self):

2708

2104

"D-Bus method"

2709

2105

return dbus.Array(c.dbus_object_path

2710

for c in

2711

tcp_server.clients.itervalues())

2106

for c in tcp_server.clients)

2712

2107

2713

2108

@dbus.service.method(_interface,

2714

2109

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

2716

2111

"D-Bus method"

2717

2112

return dbus.Dictionary(

2718

2113

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

2719

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

2114

for c in tcp_server.clients),

2720

2115

signature="oa{sv}")

2721

2116

2722

2117

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

2723

2118

def RemoveClient(self, object_path):

2724

2119

"D-Bus method"

2725

for c in tcp_server.clients.itervalues():

2120

for c in tcp_server.clients:

2726

2121

if c.dbus_object_path == object_path:

2727

del tcp_server.clients[c.name]

2122

tcp_server.clients.remove(c)

2728

2123

c.remove_from_connection()

2729

2124

# Don't signal anything except ClientRemoved

2730

2125

c.disable(quiet=True)

2735

2130

2736

2131

del _interface

2737

2132

2738

mandos_dbus_service = MandosDBusService()

2133

class MandosDBusServiceTransitional(MandosDBusService):

2134

__metaclass__ = AlternateDBusNamesMetaclass

2135

mandos_dbus_service = MandosDBusServiceTransitional()

2739

2136

2740

2137

def cleanup():

2741

2138

"Cleanup function; run on exit"

2742

2139

service.cleanup()

2743

2140

2744

2141

multiprocessing.active_children()

2745

wnull.close()

2746

if not (tcp_server.clients or client_settings):

2747

return

2748

2749

# Store client before exiting. Secrets are encrypted with key

2750

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

2751

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

2752

clients = {}

2753

with PGPEngine() as pgp:

2754

for client in tcp_server.clients.itervalues():

2755

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

2756

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

2757

key)

2758

client_dict = {}

2759

2760

# A list of attributes that can not be pickled

2761

# + secret.

2762

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

2763

"checker", "server_settings"))

2764

for name, typ in (inspect.getmembers

2765

(dbus.service.Object)):

2766

exclude.add(name)

2767

2768

client_dict["encrypted_secret"] = (client

2769

.encrypted_secret)

2770

for attr in client.client_structure:

2771

if attr not in exclude:

2772

client_dict[attr] = getattr(client, attr)

2773

2774

clients[client.name] = client_dict

2775

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

2776

2777

try:

2778

with (tempfile.NamedTemporaryFile

2779

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

2780

dir=os.path.dirname(stored_state_path),

2781

delete=False)) as stored_state:

2782

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

2783

tempname=stored_state.name

2784

os.rename(tempname, stored_state_path)

2785

except (IOError, OSError) as e:

2786

if not debug:

2787

try:

2788

os.remove(tempname)

2789

except NameError:

2790

pass

2791

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

2792

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

2793

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

2794

else:

2795

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

2796

exc_info=e)

2797

raise

2798

2799

# Delete all clients, and settings from config

2800

2142

while tcp_server.clients:

2801

name, client = tcp_server.clients.popitem()

2143

client = tcp_server.clients.pop()

2802

2144

if use_dbus:

2803

2145

client.remove_from_connection()

2146

client.disable_hook = None

2804

2147

# Don't signal anything except ClientRemoved

2805

2148

client.disable(quiet=True)

2806

2149

if use_dbus:

2808

2151

mandos_dbus_service.ClientRemoved(client

2809

2152

.dbus_object_path,

2810

2153

client.name)

2811

client_settings.clear()

2812

2154

2813

2155

atexit.register(cleanup)

2814

2156

2815

for client in tcp_server.clients.itervalues():

2157

for client in tcp_server.clients:

2816

2158

if use_dbus:

2817

2159

# Emit D-Bus signal

2818

2160

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2819

# Need to initiate checking of clients

2820

if client.enabled:

2821

client.init_checker()

2161

client.enable()

2822

2162

2823

2163

tcp_server.enable()

2824

2164

tcp_server.server_activate()

2827

2167

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

2828

2168

if use_ipv6:

2829

2169

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

2830

" flowinfo %d, scope_id %d",

2831

*tcp_server.socket.getsockname())

2170

" flowinfo %d, scope_id %d"

2171

% tcp_server.socket.getsockname())

2832

2172

else: # IPv4

2833

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

2834

*tcp_server.socket.getsockname())

2173

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

2174

% tcp_server.socket.getsockname())

2835

2175

2836

2176

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

2837

2177

2840

2180

try:

2841

2181

service.activate()

2842

2182

except dbus.exceptions.DBusException as error:

2843

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

2183

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

2844

2184

cleanup()

2845

2185

sys.exit(1)

2846

2186

# End of Avahi example code

2853

2193

logger.debug("Starting main loop")

2854

2194

main_loop.run()

2855

2195

except AvahiError as error:

2856

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

2196

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

2857

2197

cleanup()

2858

2198

sys.exit(1)

2859

2199

except KeyboardInterrupt:

2864

2204

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

2865

2205

cleanup()

2866

2206

2207

2867

2208

if __name__ == '__main__':

2868

2209

main()