/mandos/trunk : revision 24.1.184

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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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# along with this program. If not, see

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# <http://www.gnu.org/licenses/>.

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#

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# Contact the authors at <mandos@recompile.se>.

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# Contact the authors at <mandos@fukt.bsnet.se>.

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#

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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 functools

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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 = "1.6.2"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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version = "1.3.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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"""A simple class for OpenPGP symmetric encryption & decryption"""

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def __init__(self):

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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def __exit__(self, exc_type, exc_value, traceback):

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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self.name = unicode(self.server.GetAlternativeServiceName(self.name))

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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return _timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return _timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return _timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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return _timedelta_to_milliseconds(self.approval_delay)

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

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

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

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attribute."""

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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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if config is None:

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config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

343

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

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.replace(" ", ""))

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

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

555

datetime.datetime.utcnow())

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# attributes specific for this server instance

346

if "secret" in config:

347

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

348

elif "secfile" in config:

349

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

350

(config["secfile"])),

351

"rb") as secfile:

352

self.secret = secfile.read()

353

else:

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

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% self.name)

356

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

357

self.created = datetime.datetime.utcnow()

358

self.enabled = False

359

self.last_approval_request = None

360

self.last_enabled = None

361

self.last_checked_ok = None

362

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

363

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

364

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

365

self.disable_hook = disable_hook

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self.checker = None

559

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self.checker_initiator_tag = None

560

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self.disable_initiator_tag = None

369

self.expires = None

561

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self.checker_callback_tag = None

371

self.checker_command = config["checker"]

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self.current_checker_command = None

563

self.approved = None

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self.last_connect = None

374

self._approved = None

375

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

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True)

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self.approvals_pending = 0

565

self.changedstate = (multiprocessing_manager

566

.Condition(multiprocessing_manager

567

.Lock()))

568

self.client_structure = [attr for attr in

569

self.__dict__.iterkeys()

570

if not attr.startswith("_")]

571

self.client_structure.append("client_structure")

572

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

574

lambda obj:

575

isinstance(obj,

576

property)):

577

if not name.startswith("_"):

578

self.client_structure.append(name)

378

self.approval_delay = string_to_delta(

379

config["approval_delay"])

380

self.approval_duration = string_to_delta(

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config["approval_duration"])

382

self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())

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# Send notice to process children that client state has changed

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384

def send_changedstate(self):

582

with self.changedstate:

583

self.changedstate.notify_all()

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385

self.changedstate.acquire()

386

self.changedstate.notify_all()

387

self.changedstate.release()

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389

def enable(self):

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

587

391

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

588

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# Already enabled

589

393

return

394

self.send_changedstate()

395

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

396

# and every interval from then on.

397

self.checker_initiator_tag = (gobject.timeout_add

398

(self.interval_milliseconds(),

399

self.start_checker))

400

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

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

402

self.disable_initiator_tag = (gobject.timeout_add

403

(self.timeout_milliseconds(),

404

self.disable))

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self.enabled = True

592

406

self.last_enabled = datetime.datetime.utcnow()

593

self.init_checker()

594

self.send_changedstate()

407

# Also start a new checker *right now*.

408

self.start_checker()

595

409

596

410

def disable(self, quiet=True):

597

411

"""Disable this client."""

598

412

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

599

413

return False

600

414

if not quiet:

415

self.send_changedstate()

416

if not quiet:

601

417

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

602

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

418

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

603

419

gobject.source_remove(self.disable_initiator_tag)

604

420

self.disable_initiator_tag = None

605

421

self.expires = None

606

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

422

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

607

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gobject.source_remove(self.checker_initiator_tag)

608

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self.checker_initiator_tag = None

609

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self.stop_checker()

426

if self.disable_hook:

427

self.disable_hook(self)

610

428

self.enabled = False

611

if not quiet:

612

self.send_changedstate()

613

429

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

614

430

return False

615

431

616

432

def __del__(self):

433

self.disable_hook = None

617

434

self.disable()

618

435

619

def init_checker(self):

620

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

621

# and every interval from then on.

622

if self.checker_initiator_tag is not None:

623

gobject.source_remove(self.checker_initiator_tag)

624

self.checker_initiator_tag = (gobject.timeout_add

625

(self.interval_milliseconds(),

626

self.start_checker))

627

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

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

630

self.disable_initiator_tag = (gobject.timeout_add

631

(self.timeout_milliseconds(),

632

self.disable))

633

# Also start a new checker *right now*.

634

self.start_checker()

635

636

436

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

637

437

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

638

438

self.checker_callback_tag = None

639

439

self.checker = None

640

440

if os.WIFEXITED(condition):

641

self.last_checker_status = os.WEXITSTATUS(condition)

642

if self.last_checker_status == 0:

441

exitstatus = os.WEXITSTATUS(condition)

442

if exitstatus == 0:

643

443

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

644

444

vars(self))

645

445

self.checked_ok()

647

447

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

648

448

vars(self))

649

449

else:

650

self.last_checker_status = -1

651

450

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

652

451

vars(self))

653

452

654

def checked_ok(self):

655

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

656

self.last_checked_ok = datetime.datetime.utcnow()

657

self.last_checker_status = 0

658

self.bump_timeout()

659

660

def bump_timeout(self, timeout=None):

661

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

453

def checked_ok(self, timeout=None):

454

"""Bump up the timeout for this client.

455

456

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

457

alive and well.

458

"""

662

459

if timeout is None:

663

460

timeout = self.timeout

664

if self.disable_initiator_tag is not None:

665

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

667

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

668

self.disable_initiator_tag = (gobject.timeout_add

669

(timedelta_to_milliseconds

670

(timeout), self.disable))

671

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

461

self.last_checked_ok = datetime.datetime.utcnow()

462

gobject.source_remove(self.disable_initiator_tag)

463

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

464

self.disable_initiator_tag = (gobject.timeout_add

465

(_timedelta_to_milliseconds(timeout),

466

self.disable))

672

467

673

468

def need_approval(self):

674

469

self.last_approval_request = datetime.datetime.utcnow()

679

474

If a checker already exists, leave it running and do

680

475

nothing."""

681

476

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

682

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

683

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

684

# would inevitably timeout, since no checker would get a

685

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

477

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

478

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

479

# client would inevitably timeout, since no checker would get

480

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

686

481

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

687

482

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

688

483

# should be.

690

485

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

691

486

try:

692

487

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

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

488

except (AttributeError, OSError) as error:

489

if (isinstance(error, OSError)

490

and error.errno != errno.ECHILD):

491

raise error

698

492

else:

699

493

if pid:

700

494

logger.warning("Checker was a zombie")

703

497

self.current_checker_command)

704

498

# Start a new checker if needed

705

499

if self.checker is None:

706

# Escape attributes for the shell

707

escaped_attrs = dict(

708

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

709

for attr in

710

self.runtime_expansions)

711

500

try:

712

command = self.checker_command % escaped_attrs

713

except TypeError as error:

714

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

715

self.checker_command, exc_info=error)

716

return True # Try again later

501

# In case checker_command has exactly one % operator

502

command = self.checker_command % self.host

503

except TypeError:

504

# Escape attributes for the shell

505

escaped_attrs = dict(

506

(attr,

507

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

508

errors=

509

'replace')))

510

for attr in

511

self.runtime_expansions)

512

513

try:

514

command = self.checker_command % escaped_attrs

515

except TypeError as error:

516

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

517

' %s', self.checker_command, error)

518

return True # Try again later

717

519

self.current_checker_command = command

718

520

try:

719

521

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

722

524

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

723

525

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

724

526

# always replaced by /dev/null.)

725

# The exception is when not debugging but nevertheless

726

# running in the foreground; use the previously

727

# created wnull.

728

popen_args = {}

729

if (not self.server_settings["debug"]

730

and self.server_settings["foreground"]):

731

popen_args.update({"stdout": wnull,

732

"stderr": wnull })

733

527

self.checker = subprocess.Popen(command,

734

528

close_fds=True,

735

shell=True, cwd="/",

736

**popen_args)

737

except OSError as error:

738

logger.error("Failed to start subprocess",

739

exc_info=error)

740

return True

741

self.checker_callback_tag = (gobject.child_watch_add

742

(self.checker.pid,

743

self.checker_callback,

744

data=command))

745

# The checker may have completed before the gobject

746

# watch was added. Check for this.

747

try:

529

shell=True, cwd="/")

530

self.checker_callback_tag = (gobject.child_watch_add

531

(self.checker.pid,

532

self.checker_callback,

533

data=command))

534

# The checker may have completed before the gobject

535

# watch was added. Check for this.

748

536

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

537

if pid:

538

gobject.source_remove(self.checker_callback_tag)

539

self.checker_callback(pid, status, command)

749

540

except OSError as error:

750

if error.errno == errno.ECHILD:

751

# This should never happen

752

logger.error("Child process vanished",

753

exc_info=error)

754

return True

755

raise

756

if pid:

757

gobject.source_remove(self.checker_callback_tag)

758

self.checker_callback(pid, status, command)

541

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

542

error)

759

543

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

760

544

return True

761

545

768

552

return

769

553

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

770

554

try:

771

self.checker.terminate()

555

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

772

556

#time.sleep(0.5)

773

557

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

774

# self.checker.kill()

558

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

775

559

except OSError as error:

776

560

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

777

561

raise

778

562

self.checker = None

779

563

780

781

564

def dbus_service_property(dbus_interface, signature="v",

782

565

access="readwrite", byte_arrays=False):

783

566

"""Decorators for marking methods of a DBusObjectWithProperties to

794

577

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

795

578

if byte_arrays and signature != "ay":

796

579

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

797

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

580

" signature %r" % signature)

798

581

def decorator(func):

799

582

func._dbus_is_property = True

800

583

func._dbus_interface = dbus_interface

808

591

return decorator

809

592

810

593

811

def dbus_interface_annotations(dbus_interface):

812

"""Decorator for marking functions returning interface annotations

813

814

Usage:

815

816

@dbus_interface_annotations("org.example.Interface")

817

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

818

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

819

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

820

"false"}

821

"""

822

def decorator(func):

823

func._dbus_is_interface = True

824

func._dbus_interface = dbus_interface

825

func._dbus_name = dbus_interface

826

return func

827

return decorator

828

829

830

def dbus_annotations(annotations):

831

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

832

Usage:

833

834

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

835

access="r")

836

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

837

"org.freedesktop.DBus.Property."

838

"EmitsChangedSignal": "false"})

839

def Property_dbus_property(self):

840

return dbus.Boolean(False)

841

"""

842

def decorator(func):

843

func._dbus_annotations = annotations

844

return func

845

return decorator

846

847

848

594

class DBusPropertyException(dbus.exceptions.DBusException):

849

595

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

850

596

"""

866

612

867

613

class DBusObjectWithProperties(dbus.service.Object):

868

614

"""A D-Bus object with properties.

869

615

870

616

Classes inheriting from this can use the dbus_service_property

871

617

decorator to expose methods as D-Bus properties. It exposes the

872

618

standard Get(), Set(), and GetAll() methods on the D-Bus.

873

619

"""

874

620

875

621

@staticmethod

876

def _is_dbus_thing(thing):

877

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

878

879

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

880

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

881

"""

882

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

883

False)

622

def _is_dbus_property(obj):

623

return getattr(obj, "_dbus_is_property", False)

884

624

885

def _get_all_dbus_things(self, thing):

625

def _get_all_dbus_properties(self):

886

626

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

887

627

"""

888

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

889

name),

890

athing.__get__(self))

891

for cls in self.__class__.__mro__

892

for name, athing in

893

inspect.getmembers(cls,

894

self._is_dbus_thing(thing)))

628

return ((prop._dbus_name, prop)

629

for name, prop in

630

inspect.getmembers(self, self._is_dbus_property))

895

631

896

632

def _get_dbus_property(self, interface_name, property_name):

897

633

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

898

634

property with the specified name and interface.

899

635

"""

900

for cls in self.__class__.__mro__:

901

for name, value in (inspect.getmembers

902

(cls,

903

self._is_dbus_thing("property"))):

904

if (value._dbus_name == property_name

905

and value._dbus_interface == interface_name):

906

return value.__get__(self)

907

636

for name in (property_name,

637

property_name + "_dbus_property"):

638

prop = getattr(self, name, None)

639

if (prop is None

640

or not self._is_dbus_property(prop)

641

or prop._dbus_name != property_name

642

or (interface_name and prop._dbus_interface

643

and interface_name != prop._dbus_interface)):

644

continue

645

return prop

908

646

# No such property

909

647

raise DBusPropertyNotFound(self.dbus_object_path + ":"

910

648

+ interface_name + "."

935

673

# signatures other than "ay".

936

674

if prop._dbus_signature != "ay":

937

675

raise ValueError

938

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

939

for byte in value))

676

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

677

for byte in value))

940

678

prop(value)

941

679

942

680

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

944

682

def GetAll(self, interface_name):

945

683

"""Standard D-Bus property GetAll() method, see D-Bus

946

684

standard.

947

685

948

686

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

949

687

"""

950

properties = {}

951

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

688

all = {}

689

for name, prop in self._get_all_dbus_properties():

952

690

if (interface_name

953

691

and interface_name != prop._dbus_interface):

954

692

# Interface non-empty but did not match

958

696

continue

959

697

value = prop()

960

698

if not hasattr(value, "variant_level"):

961

properties[name] = value

699

all[name] = value

962

700

continue

963

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

964

value.variant_level+1)

965

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

701

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

702

value.variant_level+1)

703

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

966

704

967

705

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

968

706

out_signature="s",

969

707

path_keyword='object_path',

970

708

connection_keyword='connection')

971

709

def Introspect(self, object_path, connection):

972

"""Overloading of standard D-Bus method.

973

974

Inserts property tags and interface annotation tags.

710

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

975

711

"""

976

712

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

977

713

connection)

984

720

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

985

721

return e

986

722

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

987

# Add property tags

988

723

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

989

724

for name, prop

990

in self._get_all_dbus_things("property")

725

in self._get_all_dbus_properties()

991

726

if prop._dbus_interface

992

727

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

993

728

if_tag.appendChild(tag)

994

# Add annotation tags

995

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

996

for tag in if_tag.getElementsByTagName(typ):

997

annots = dict()

998

for name, prop in (self.

999

_get_all_dbus_things(typ)):

1000

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

1001

and prop._dbus_interface

1002

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

1003

annots.update(getattr

1004

(prop,

1005

"_dbus_annotations",

1006

{}))

1007

for name, value in annots.iteritems():

1008

ann_tag = document.createElement(

1009

"annotation")

1010

ann_tag.setAttribute("name", name)

1011

ann_tag.setAttribute("value", value)

1012

tag.appendChild(ann_tag)

1013

# Add interface annotation tags

1014

for annotation, value in dict(

1015

itertools.chain.from_iterable(

1016

annotations().iteritems()

1017

for name, annotations in

1018

self._get_all_dbus_things("interface")

1019

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

1020

)).iteritems():

1021

ann_tag = document.createElement("annotation")

1022

ann_tag.setAttribute("name", annotation)

1023

ann_tag.setAttribute("value", value)

1024

if_tag.appendChild(ann_tag)

1025

729

# Add the names to the return values for the

1026

730

# "org.freedesktop.DBus.Properties" methods

1027

731

if (if_tag.getAttribute("name")

1042

746

except (AttributeError, xml.dom.DOMException,

1043

747

xml.parsers.expat.ExpatError) as error:

1044

748

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

1045

exc_info=error)

749

error)

1046

750

return xmlstring

1047

751

1048

752

1049

def datetime_to_dbus(dt, variant_level=0):

753

def datetime_to_dbus (dt, variant_level=0):

1050

754

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

1051

755

if dt is None:

1052

756

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

1053

757

return dbus.String(dt.isoformat(),

1054

758

variant_level=variant_level)

1055

759

1056

1057

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1058

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

1059

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

1060

interface names according to the "alt_interface_names" mapping.

1061

Usage:

1062

1063

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

1064

"net.example.AlternateInterface"})

1065

class SampleDBusObject(dbus.service.Object):

1066

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

1067

def SampleDBusMethod():

1068

pass

1069

1070

The above "SampleDBusMethod" on "SampleDBusObject" will be

1071

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

1072

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

1073

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

1074

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

1075

1076

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

1077

(from DBusObjectWithProperties) and interfaces (from the

1078

dbus_interface_annotations decorator).

1079

"""

1080

def wrapper(cls):

1081

for orig_interface_name, alt_interface_name in (

1082

alt_interface_names.iteritems()):

1083

attr = {}

1084

interface_names = set()

1085

# Go though all attributes of the class

1086

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

1087

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

1088

# with the wrong interface name

1089

if (not hasattr(attribute, "_dbus_interface")

1090

or not attribute._dbus_interface

1091

.startswith(orig_interface_name)):

1092

continue

1093

# Create an alternate D-Bus interface name based on

1094

# the current name

1095

alt_interface = (attribute._dbus_interface

1096

.replace(orig_interface_name,

1097

alt_interface_name))

1098

interface_names.add(alt_interface)

1099

# Is this a D-Bus signal?

1100

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

1101

# Extract the original non-method undecorated

1102

# function by black magic

1103

nonmethod_func = (dict(

1104

zip(attribute.func_code.co_freevars,

1105

attribute.__closure__))["func"]

1106

.cell_contents)

1107

# Create a new, but exactly alike, function

1108

# object, and decorate it to be a new D-Bus signal

1109

# with the alternate D-Bus interface name

1110

new_function = (dbus.service.signal

1111

(alt_interface,

1112

attribute._dbus_signature)

1113

(types.FunctionType(

1114

nonmethod_func.func_code,

1115

nonmethod_func.func_globals,

1116

nonmethod_func.func_name,

1117

nonmethod_func.func_defaults,

1118

nonmethod_func.func_closure)))

1119

# Copy annotations, if any

1120

try:

1121

new_function._dbus_annotations = (

1122

dict(attribute._dbus_annotations))

1123

except AttributeError:

1124

pass

1125

# Define a creator of a function to call both the

1126

# original and alternate functions, so both the

1127

# original and alternate signals gets sent when

1128

# the function is called

1129

def fixscope(func1, func2):

1130

"""This function is a scope container to pass

1131

func1 and func2 to the "call_both" function

1132

outside of its arguments"""

1133

def call_both(*args, **kwargs):

1134

"""This function will emit two D-Bus

1135

signals by calling func1 and func2"""

1136

func1(*args, **kwargs)

1137

func2(*args, **kwargs)

1138

return call_both

1139

# Create the "call_both" function and add it to

1140

# the class

1141

attr[attrname] = fixscope(attribute, new_function)

1142

# Is this a D-Bus method?

1143

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

1144

# Create a new, but exactly alike, function

1145

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

1146

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

1147

# to the class.

1148

attr[attrname] = (dbus.service.method

1149

(alt_interface,

1150

attribute._dbus_in_signature,

1151

attribute._dbus_out_signature)

1152

(types.FunctionType

1153

(attribute.func_code,

1154

attribute.func_globals,

1155

attribute.func_name,

1156

attribute.func_defaults,

1157

attribute.func_closure)))

1158

# Copy annotations, if any

1159

try:

1160

attr[attrname]._dbus_annotations = (

1161

dict(attribute._dbus_annotations))

1162

except AttributeError:

1163

pass

1164

# Is this a D-Bus property?

1165

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

1166

# Create a new, but exactly alike, function

1167

# object, and decorate it to be a new D-Bus

1168

# property with the alternate D-Bus interface

1169

# name. Add it to the class.

1170

attr[attrname] = (dbus_service_property

1171

(alt_interface,

1172

attribute._dbus_signature,

1173

attribute._dbus_access,

1174

attribute

1175

._dbus_get_args_options

1176

["byte_arrays"])

1177

(types.FunctionType

1178

(attribute.func_code,

1179

attribute.func_globals,

1180

attribute.func_name,

1181

attribute.func_defaults,

1182

attribute.func_closure)))

1183

# Copy annotations, if any

1184

try:

1185

attr[attrname]._dbus_annotations = (

1186

dict(attribute._dbus_annotations))

1187

except AttributeError:

1188

pass

1189

# Is this a D-Bus interface?

1190

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

1191

# Create a new, but exactly alike, function

1192

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

1193

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

1194

# to the class.

1195

attr[attrname] = (dbus_interface_annotations

1196

(alt_interface)

1197

(types.FunctionType

1198

(attribute.func_code,

1199

attribute.func_globals,

1200

attribute.func_name,

1201

attribute.func_defaults,

1202

attribute.func_closure)))

1203

if deprecate:

1204

# Deprecate all alternate interfaces

1205

iname="_AlternateDBusNames_interface_annotation{0}"

1206

for interface_name in interface_names:

1207

@dbus_interface_annotations(interface_name)

1208

def func(self):

1209

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

1210

"true" }

1211

# Find an unused name

1212

for aname in (iname.format(i)

1213

for i in itertools.count()):

1214

if aname not in attr:

1215

attr[aname] = func

1216

break

1217

if interface_names:

1218

# Replace the class with a new subclass of it with

1219

# methods, signals, etc. as created above.

1220

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

1221

(cls,), attr)

1222

return cls

1223

return wrapper

1224

1225

1226

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

1227

"se.bsnet.fukt.Mandos"})

1228

760

class ClientDBus(Client, DBusObjectWithProperties):

1229

761

"""A Client class using D-Bus

1230

762

1239

771

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

1240

772

1241

773

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

774

self._approvals_pending = 0

1242

775

self.bus = bus

1243

776

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

1244

777

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

1250

783

("/clients/" + client_object_name))

1251

784

DBusObjectWithProperties.__init__(self, self.bus,

1252

785

self.dbus_object_path)

1253

786

1254

787

def notifychangeproperty(transform_func,

1255

788

dbus_name, type_func=lambda x: x,

1256

789

variant_level=1):

1257

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

1258

its changes to DBus.

1259

1260

transform_fun: Function that takes a value and a variant_level

1261

and transforms it to a D-Bus type.

1262

dbus_name: D-Bus name of the variable

790

""" Modify a variable so that its a property that announce its

791

changes to DBus.

792

transform_fun: Function that takes a value and transform it to

793

DBus type.

794

dbus_name: DBus name of the variable

1263

795

type_func: Function that transform the value before sending it

1264

to the D-Bus. Default: no transform

1265

variant_level: D-Bus variant level. Default: 1

796

to DBus

797

variant_level: DBus variant level. default: 1

1266

798

"""

1267

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

799

real_value = [None,]

1268

800

def setter(self, value):

801

old_value = real_value[0]

802

real_value[0] = value

1269

803

if hasattr(self, "dbus_object_path"):

1270

if (not hasattr(self, attrname) or

1271

type_func(getattr(self, attrname, None))

1272

!= type_func(value)):

1273

dbus_value = transform_func(type_func(value),

1274

variant_level

1275

=variant_level)

804

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

805

dbus_value = transform_func(type_func(real_value[0]),

806

variant_level)

1276

807

self.PropertyChanged(dbus.String(dbus_name),

1277

808

dbus_value)

1278

setattr(self, attrname, value)

1279

1280

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

1281

809

810

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

811

812

1282

813

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1283

814

approvals_pending = notifychangeproperty(dbus.Boolean,

1284

815

"ApprovalPending",

1287

818

last_enabled = notifychangeproperty(datetime_to_dbus,

1288

819

"LastEnabled")

1289

820

checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",

1290

type_func = lambda checker:

1291

checker is not None)

821

type_func = lambda checker: checker is not None)

1292

822

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1293

823

"LastCheckedOK")

1294

last_checker_status = notifychangeproperty(dbus.Int16,

1295

"LastCheckerStatus")

1296

last_approval_request = notifychangeproperty(

1297

datetime_to_dbus, "LastApprovalRequest")

824

last_approval_request = notifychangeproperty(datetime_to_dbus,

825

"LastApprovalRequest")

1298

826

approved_by_default = notifychangeproperty(dbus.Boolean,

1299

827

"ApprovedByDefault")

1300

approval_delay = notifychangeproperty(dbus.UInt64,

1301

"ApprovalDelay",

1302

type_func =

1303

timedelta_to_milliseconds)

1304

approval_duration = notifychangeproperty(

1305

dbus.UInt64, "ApprovalDuration",

1306

type_func = timedelta_to_milliseconds)

828

approval_delay = notifychangeproperty(dbus.UInt16, "ApprovalDelay",

829

type_func = _timedelta_to_milliseconds)

830

approval_duration = notifychangeproperty(dbus.UInt16, "ApprovalDuration",

831

type_func = _timedelta_to_milliseconds)

1307

832

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

1308

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

1309

type_func =

1310

timedelta_to_milliseconds)

1311

extended_timeout = notifychangeproperty(

1312

dbus.UInt64, "ExtendedTimeout",

1313

type_func = timedelta_to_milliseconds)

1314

interval = notifychangeproperty(dbus.UInt64,

1315

"Interval",

1316

type_func =

1317

timedelta_to_milliseconds)

833

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

834

type_func = _timedelta_to_milliseconds)

835

extended_timeout = notifychangeproperty(dbus.UInt16, "ExtendedTimeout",

836

type_func = _timedelta_to_milliseconds)

837

interval = notifychangeproperty(dbus.UInt16, "Interval",

838

type_func = _timedelta_to_milliseconds)

1318

839

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

1319

840

1320

841

del notifychangeproperty

1346

867

1347

868

return Client.checker_callback(self, pid, condition, command,

1348

869

*args, **kwargs)

1349

870

1350

871

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

1351

872

old_checker = self.checker

1352

873

if self.checker is not None:

1362

883

return r

1363

884

1364

885

def _reset_approved(self):

1365

self.approved = None

886

self._approved = None

1366

887

return False

1367

888

1368

889

def approve(self, value=True):

1369

self.approved = value

1370

gobject.timeout_add(timedelta_to_milliseconds

890

self.send_changedstate()

891

self._approved = value

892

gobject.timeout_add(_timedelta_to_milliseconds

1371

893

(self.approval_duration),

1372

894

self._reset_approved)

1373

self.send_changedstate()

895

1374

896

1375

897

## D-Bus methods, signals & properties

1376

_interface = "se.recompile.Mandos.Client"

1377

1378

## Interfaces

1379

1380

@dbus_interface_annotations(_interface)

1381

def _foo(self):

1382

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

1383

"false"}

898

_interface = "se.bsnet.fukt.Mandos.Client"

1384

899

1385

900

## Signals

1386

901

1486

1001

access="readwrite")

1487

1002

def ApprovalDuration_dbus_property(self, value=None):

1488

1003

if value is None: # get

1489

return dbus.UInt64(timedelta_to_milliseconds(

1004

return dbus.UInt64(_timedelta_to_milliseconds(

1490

1005

self.approval_duration))

1491

1006

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

1492

1007

1506

1021

def Host_dbus_property(self, value=None):

1507

1022

if value is None: # get

1508

1023

return dbus.String(self.host)

1509

self.host = unicode(value)

1024

self.host = value

1510

1025

1511

1026

# Created - property

1512

1027

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

1513

1028

def Created_dbus_property(self):

1514

return datetime_to_dbus(self.created)

1029

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

1515

1030

1516

1031

# LastEnabled - property

1517

1032

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

1538

1053

return

1539

1054

return datetime_to_dbus(self.last_checked_ok)

1540

1055

1541

# LastCheckerStatus - property

1542

@dbus_service_property(_interface, signature="n",

1543

access="read")

1544

def LastCheckerStatus_dbus_property(self):

1545

return dbus.Int16(self.last_checker_status)

1546

1547

1056

# Expires - property

1548

1057

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

1549

1058

def Expires_dbus_property(self):

1560

1069

def Timeout_dbus_property(self, value=None):

1561

1070

if value is None: # get

1562

1071

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1564

1072

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

1565

# Reschedule disabling

1566

if self.enabled:

1567

now = datetime.datetime.utcnow()

1568

self.expires += self.timeout - old_timeout

1569

if self.expires <= now:

1570

# The timeout has passed

1571

self.disable()

1572

else:

1573

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

1574

is None):

1575

return

1576

gobject.source_remove(self.disable_initiator_tag)

1577

self.disable_initiator_tag = (

1578

gobject.timeout_add(

1579

timedelta_to_milliseconds(self.expires - now),

1580

self.disable))

1581

1073

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

1074

return

1075

# Reschedule timeout

1076

gobject.source_remove(self.disable_initiator_tag)

1077

self.disable_initiator_tag = None

1078

self.expires = None

1079

time_to_die = (self.

1080

_timedelta_to_milliseconds((self

1081

.last_checked_ok

1082

+ self.timeout)

1083

- datetime.datetime

1084

.utcnow()))

1085

if time_to_die <= 0:

1086

# The timeout has passed

1087

self.disable()

1088

else:

1089

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

1090

+ datetime.timedelta(milliseconds = time_to_die))

1091

self.disable_initiator_tag = (gobject.timeout_add

1092

(time_to_die, self.disable))

1093

1582

1094

# ExtendedTimeout - property

1583

1095

@dbus_service_property(_interface, signature="t",

1584

1096

access="readwrite")

1586

1098

if value is None: # get

1587

1099

return dbus.UInt64(self.extended_timeout_milliseconds())

1588

1100

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

1589

1101

1590

1102

# Interval - property

1591

1103

@dbus_service_property(_interface, signature="t",

1592

1104

access="readwrite")

1596

1108

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

1597

1109

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

1598

1110

return

1599

if self.enabled:

1600

# Reschedule checker run

1601

gobject.source_remove(self.checker_initiator_tag)

1602

self.checker_initiator_tag = (gobject.timeout_add

1603

(value, self.start_checker))

1604

self.start_checker() # Start one now, too

1605

1111

# Reschedule checker run

1112

gobject.source_remove(self.checker_initiator_tag)

1113

self.checker_initiator_tag = (gobject.timeout_add

1114

(value, self.start_checker))

1115

self.start_checker() # Start one now, too

1116

1606

1117

# Checker - property

1607

1118

@dbus_service_property(_interface, signature="s",

1608

1119

access="readwrite")

1609

1120

def Checker_dbus_property(self, value=None):

1610

1121

if value is None: # get

1611

1122

return dbus.String(self.checker_command)

1612

self.checker_command = unicode(value)

1123

self.checker_command = value

1613

1124

1614

1125

# CheckerRunning - property

1615

1126

@dbus_service_property(_interface, signature="b",

1642

1153

self._pipe.send(('init', fpr, address))

1643

1154

if not self._pipe.recv():

1644

1155

raise KeyError()

1645

1156

1646

1157

def __getattribute__(self, name):

1647

if name == '_pipe':

1158

if(name == '_pipe'):

1648

1159

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

1649

1160

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

1650

1161

data = self._pipe.recv()

1655

1166

self._pipe.send(('funcall', name, args, kwargs))

1656

1167

return self._pipe.recv()[1]

1657

1168

return func

1658

1169

1659

1170

def __setattr__(self, name, value):

1660

if name == '_pipe':

1171

if(name == '_pipe'):

1661

1172

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

1662

1173

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

1663

1174

1674

1185

unicode(self.client_address))

1675

1186

logger.debug("Pipe FD: %d",

1676

1187

self.server.child_pipe.fileno())

1677

1188

1678

1189

session = (gnutls.connection

1679

1190

.ClientSession(self.request,

1680

1191

gnutls.connection

1681

1192

.X509Credentials()))

1682

1193

1683

1194

# Note: gnutls.connection.X509Credentials is really a

1684

1195

# generic GnuTLS certificate credentials object so long as

1685

1196

# no X.509 keys are added to it. Therefore, we can use it

1686

1197

# here despite using OpenPGP certificates.

1687

1198

1688

1199

#priority = ':'.join(("NONE", "+VERS-TLS1.1",

1689

1200

# "+AES-256-CBC", "+SHA1",

1690

1201

# "+COMP-NULL", "+CTYPE-OPENPGP",

1696

1207

(gnutls.library.functions

1697

1208

.gnutls_priority_set_direct(session._c_object,

1698

1209

priority, None))

1699

1210

1700

1211

# Start communication using the Mandos protocol

1701

1212

# Get protocol number

1702

1213

line = self.request.makefile().readline()

1703

1214

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

1704

1215

try:

1705

1216

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

1706

raise RuntimeError(line)

1217

raise RuntimeError

1707

1218

except (ValueError, IndexError, RuntimeError) as error:

1708

1219

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

1709

1220

return

1710

1221

1711

1222

# Start GnuTLS connection

1712

1223

try:

1713

1224

session.handshake()

1717

1228

# established. Just abandon the request.

1718

1229

return

1719

1230

logger.debug("Handshake succeeded")

1720

1231

1721

1232

approval_required = False

1722

1233

try:

1723

1234

try:

1728

1239

logger.warning("Bad certificate: %s", error)

1729

1240

return

1730

1241

logger.debug("Fingerprint: %s", fpr)

1731

1242

1732

1243

try:

1733

1244

client = ProxyClient(child_pipe, fpr,

1734

1245

self.client_address)

1746

1257

client.name)

1747

1258

if self.server.use_dbus:

1748

1259

# Emit D-Bus signal

1749

client.Rejected("Disabled")

1260

client.Rejected("Disabled")

1750

1261

return

1751

1262

1752

if client.approved or not client.approval_delay:

1263

if client._approved or not client.approval_delay:

1753

1264

#We are approved or approval is disabled

1754

1265

break

1755

elif client.approved is None:

1266

elif client._approved is None:

1756

1267

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

1757

1268

client.name)

1758

1269

if self.server.use_dbus:

1769

1280

return

1770

1281

1771

1282

#wait until timeout or approved

1283

#x = float(client._timedelta_to_milliseconds(delay))

1772

1284

time = datetime.datetime.now()

1773

1285

client.changedstate.acquire()

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1286

client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))

1777

1287

client.changedstate.release()

1778

1288

time2 = datetime.datetime.now()

1779

1289

if (time2 - time) >= delay:

1795

1305

try:

1796

1306

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

1797

1307

except gnutls.errors.GNUTLSError as error:

1798

logger.warning("gnutls send failed",

1799

exc_info=error)

1308

logger.warning("gnutls send failed")

1800

1309

return

1801

1310

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

1802

1311

sent, len(client.secret)

1803

1312

- (sent_size + sent))

1804

1313

sent_size += sent

1805

1314

1806

1315

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

1807

# bump the timeout using extended_timeout

1808

client.bump_timeout(client.extended_timeout)

1316

# bump the timeout as if seen

1317

client.checked_ok(client.extended_timeout)

1809

1318

if self.server.use_dbus:

1810

1319

# Emit D-Bus signal

1811

1320

client.GotSecret()

1816

1325

try:

1817

1326

session.bye()

1818

1327

except gnutls.errors.GNUTLSError as error:

1819

logger.warning("GnuTLS bye failed",

1820

exc_info=error)

1328

logger.warning("GnuTLS bye failed")

1821

1329

1822

1330

@staticmethod

1823

1331

def peer_certificate(session):

1879

1387

# Convert the buffer to a Python bytestring

1880

1388

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

1881

1389

# Convert the bytestring to hexadecimal notation

1882

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

1390

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

1883

1391

return hex_fpr

1884

1392

1885

1393

1888

1396

def sub_process_main(self, request, address):

1889

1397

try:

1890

1398

self.finish_request(request, address)

1891

except Exception:

1399

except:

1892

1400

self.handle_error(request, address)

1893

1401

self.close_request(request)

1894

1402

1895

1403

def process_request(self, request, address):

1896

1404

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

1897

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

1898

args = (request, address))

1899

proc.start()

1900

return proc

1901

1405

multiprocessing.Process(target = self.sub_process_main,

1406

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

1902

1407

1903

1408

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1904

1409

""" adds a pipe to the MixIn """

1908

1413

This function creates a new pipe in self.pipe

1909

1414

"""

1910

1415

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1911

1912

proc = MultiprocessingMixIn.process_request(self, request,

1913

client_address)

1416

1417

super(MultiprocessingMixInWithPipe,

1418

self).process_request(request, client_address)

1914

1419

self.child_pipe.close()

1915

self.add_pipe(parent_pipe, proc)

1916

1917

def add_pipe(self, parent_pipe, proc):

1420

self.add_pipe(parent_pipe)

1421

1422

def add_pipe(self, parent_pipe):

1918

1423

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

1919

raise NotImplementedError()

1920

1424

raise NotImplementedError

1921

1425

1922

1426

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1923

1427

socketserver.TCPServer, object):

1929

1433

use_ipv6: Boolean; to use IPv6 or not

1930

1434

"""

1931

1435

def __init__(self, server_address, RequestHandlerClass,

1932

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

1933

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

1934

creating a new one with socket.socket().

1935

"""

1436

interface=None, use_ipv6=True):

1936

1437

self.interface = interface

1937

1438

if use_ipv6:

1938

1439

self.address_family = socket.AF_INET6

1939

if socketfd is not None:

1940

# Save the file descriptor

1941

self.socketfd = socketfd

1942

# Save the original socket.socket() function

1943

self.socket_socket = socket.socket

1944

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

1945

#

1946

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

1947

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

1948

# patching socket.socket.)

1949

#

1950

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

1951

@functools.wraps(socket.socket)

1952

def socket_wrapper(*args, **kwargs):

1953

# Restore original function so subsequent calls are

1954

# not affected.

1955

socket.socket = self.socket_socket

1956

del self.socket_socket

1957

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

1958

# saved file descriptor.

1959

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

1960

# Replace socket.socket() function with wrapper

1961

socket.socket = socket_wrapper

1962

# The socketserver.TCPServer.__init__ will call

1963

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

1964

# socket_wrapper(), if socketfd was set.

1965

1440

socketserver.TCPServer.__init__(self, server_address,

1966

1441

RequestHandlerClass)

1967

1968

1442

def server_bind(self):

1969

1443

"""This overrides the normal server_bind() function

1970

1444

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

1978

1452

try:

1979

1453

self.socket.setsockopt(socket.SOL_SOCKET,

1980

1454

SO_BINDTODEVICE,

1981

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

1455

str(self.interface

1456

+ '\0'))

1982

1457

except socket.error as error:

1983

if error.errno == errno.EPERM:

1984

logger.error("No permission to bind to"

1985

" interface %s", self.interface)

1986

elif error.errno == errno.ENOPROTOOPT:

1458

if error[0] == errno.EPERM:

1459

logger.error("No permission to"

1460

" bind to interface %s",

1461

self.interface)

1462

elif error[0] == errno.ENOPROTOOPT:

1987

1463

logger.error("SO_BINDTODEVICE not available;"

1988

1464

" cannot bind to interface %s",

1989

1465

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

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

1992

" cannot bind", self.interface)

1993

1466

else:

1994

1467

raise

1995

1468

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

1998

1471

if self.address_family == socket.AF_INET6:

1999

1472

any_address = "::" # in6addr_any

2000

1473

else:

2001

any_address = "0.0.0.0" # INADDR_ANY

1474

any_address = socket.INADDR_ANY

2002

1475

self.server_address = (any_address,

2003

1476

self.server_address[1])

2004

1477

elif not self.server_address[1]:

2025

1498

"""

2026

1499

def __init__(self, server_address, RequestHandlerClass,

2027

1500

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

2028

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

1501

gnutls_priority=None, use_dbus=True):

2029

1502

self.enabled = False

2030

1503

self.clients = clients

2031

1504

if self.clients is None:

2032

self.clients = {}

1505

self.clients = set()

2033

1506

self.use_dbus = use_dbus

2034

1507

self.gnutls_priority = gnutls_priority

2035

1508

IPv6_TCPServer.__init__(self, server_address,

2036

1509

RequestHandlerClass,

2037

1510

interface = interface,

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1511

use_ipv6 = use_ipv6)

2040

1512

def server_activate(self):

2041

1513

if self.enabled:

2042

1514

return socketserver.TCPServer.server_activate(self)

2043

2044

1515

def enable(self):

2045

1516

self.enabled = True

2046

2047

def add_pipe(self, parent_pipe, proc):

1517

def add_pipe(self, parent_pipe):

2048

1518

# Call "handle_ipc" for both data and EOF events

2049

1519

gobject.io_add_watch(parent_pipe.fileno(),

2050

1520

gobject.IO_IN | gobject.IO_HUP,

2051

1521

functools.partial(self.handle_ipc,

2052

parent_pipe =

2053

parent_pipe,

2054

proc = proc))

2055

1522

parent_pipe = parent_pipe))

1523

2056

1524

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

2057

proc = None, client_object=None):

2058

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

2059

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

2060

# Wait for other process to exit

2061

proc.join()

1525

client_object=None):

1526

condition_names = {

1527

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

1528

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

1529

# blocking).

1530

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

1531

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

1532

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

1533

# broken, usually for pipes and

1534

# sockets).

1535

}

1536

conditions_string = ' | '.join(name

1537

for cond, name in

1538

condition_names.iteritems()

1539

if cond & condition)

1540

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

1541

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

2062

1542

return False

2063

1543

2064

1544

# Read a request from the child

2069

1549

fpr = request[1]

2070

1550

address = request[2]

2071

1551

2072

for c in self.clients.itervalues():

1552

for c in self.clients:

2073

1553

if c.fingerprint == fpr:

2074

1554

client = c

2075

1555

break

2078

1558

"dress: %s", fpr, address)

2079

1559

if self.use_dbus:

2080

1560

# Emit D-Bus signal

2081

mandos_dbus_service.ClientNotFound(fpr,

2082

address[0])

1561

mandos_dbus_service.ClientNotFound(fpr, address[0])

2083

1562

parent_pipe.send(False)

2084

1563

return False

2085

1564

2086

1565

gobject.io_add_watch(parent_pipe.fileno(),

2087

1566

gobject.IO_IN | gobject.IO_HUP,

2088

1567

functools.partial(self.handle_ipc,

2089

parent_pipe =

2090

parent_pipe,

2091

proc = proc,

2092

client_object =

2093

client))

1568

parent_pipe = parent_pipe,

1569

client_object = client))

2094

1570

parent_pipe.send(True)

2095

# remove the old hook in favor of the new above hook on

2096

# same fileno

1571

# remove the old hook in favor of the new above hook on same fileno

2097

1572

return False

2098

1573

if command == 'funcall':

2099

1574

funcname = request[1]

2100

1575

args = request[2]

2101

1576

kwargs = request[3]

2102

1577

2103

parent_pipe.send(('data', getattr(client_object,

2104

funcname)(*args,

2105

**kwargs)))

2106

1578

parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))

1579

2107

1580

if command == 'getattr':

2108

1581

attrname = request[1]

2109

1582

if callable(client_object.__getattribute__(attrname)):

2110

1583

parent_pipe.send(('function',))

2111

1584

else:

2112

parent_pipe.send(('data', client_object

2113

.__getattribute__(attrname)))

1585

parent_pipe.send(('data', client_object.__getattribute__(attrname)))

2114

1586

2115

1587

if command == 'setattr':

2116

1588

attrname = request[1]

2117

1589

value = request[2]

2118

1590

setattr(client_object, attrname, value)

2119

1591

2120

1592

return True

2121

1593

2122

1594

2123

def rfc3339_duration_to_delta(duration):

2124

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

2125

2126

>>> rfc3339_duration_to_delta("P7D")

2127

datetime.timedelta(7)

2128

>>> rfc3339_duration_to_delta("PT60S")

2129

datetime.timedelta(0, 60)

2130

>>> rfc3339_duration_to_delta("PT60M")

2131

datetime.timedelta(0, 3600)

2132

>>> rfc3339_duration_to_delta("PT24H")

2133

datetime.timedelta(1)

2134

>>> rfc3339_duration_to_delta("P1W")

2135

datetime.timedelta(7)

2136

>>> rfc3339_duration_to_delta("PT5M30S")

2137

datetime.timedelta(0, 330)

2138

>>> rfc3339_duration_to_delta("P1DT3M20S")

2139

datetime.timedelta(1, 200)

2140

"""

2141

2142

# Parsing an RFC 3339 duration with regular expressions is not

2143

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

2144

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

2145

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

2146

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

2147

# avoid excessive use of external libraries.

2148

2149

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

2150

Token = collections.namedtuple("Token",

2151

("regexp", # To match token; if

2152

# "value" is not None,

2153

# must have a "group"

2154

# containing digits

2155

"value", # datetime.timedelta or

2156

# None

2157

"followers")) # Tokens valid after

2158

# this token

2159

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

2160

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

2161

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

2162

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

2163

datetime.timedelta(seconds=1),

2164

frozenset((token_end,)))

2165

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

2166

datetime.timedelta(minutes=1),

2167

frozenset((token_second, token_end)))

2168

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

2169

datetime.timedelta(hours=1),

2170

frozenset((token_minute, token_end)))

2171

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

2172

None,

2173

frozenset((token_hour, token_minute,

2174

token_second)))

2175

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

2176

datetime.timedelta(days=1),

2177

frozenset((token_time, token_end)))

2178

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

2179

datetime.timedelta(weeks=4),

2180

frozenset((token_day, token_end)))

2181

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

2182

datetime.timedelta(weeks=52),

2183

frozenset((token_month, token_end)))

2184

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

2185

datetime.timedelta(weeks=1),

2186

frozenset((token_end,)))

2187

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

2188

frozenset((token_year, token_month,

2189

token_day, token_time,

2190

token_week))),

2191

# Define starting values

2192

value = datetime.timedelta() # Value so far

2193

found_token = None

2194

followers = frozenset(token_duration,) # Following valid tokens

2195

s = duration # String left to parse

2196

# Loop until end token is found

2197

while found_token is not token_end:

2198

# Search for any currently valid tokens

2199

for token in followers:

2200

match = token.regexp.match(s)

2201

if match is not None:

2202

# Token found

2203

if token.value is not None:

2204

# Value found, parse digits

2205

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

2206

# Add to value so far

2207

value += factor * token.value

2208

# Strip token from string

2209

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

2210

# Go to found token

2211

found_token = token

2212

# Set valid next tokens

2213

followers = found_token.followers

2214

break

2215

else:

2216

# No currently valid tokens were found

2217

raise ValueError("Invalid RFC 3339 duration")

2218

# End token found

2219

return value

2220

2221

2222

1595

def string_to_delta(interval):

2223

1596

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

2224

1597

2235

1608

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

2236

1609

datetime.timedelta(0, 330)

2237

1610

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

2244

1611

timevalue = datetime.timedelta(0)

2245

1612

for s in interval.split():

2246

1613

try:

2257

1624

elif suffix == "w":

2258

1625

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

2259

1626

else:

2260

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

2261

.format(suffix))

2262

except IndexError as e:

1627

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

1628

except (ValueError, IndexError) as e:

2263

1629

raise ValueError(*(e.args))

2264

1630

timevalue += delta

2265

1631

return timevalue

2266

1632

2267

1633

1634

def if_nametoindex(interface):

1635

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

1636

1637

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

1638

global if_nametoindex

1639

try:

1640

if_nametoindex = (ctypes.cdll.LoadLibrary

1641

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

1642

.if_nametoindex)

1643

except (OSError, AttributeError):

1644

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

1645

def if_nametoindex(interface):

1646

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

1647

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

1648

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

1649

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1650

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

1651

interface))

1652

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

1653

ifreq[16:20])[0]

1654

return interface_index

1655

return if_nametoindex(interface)

1656

1657

2268

1658

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

2269

1659

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

2270

1660

2278

1668

sys.exit()

2279

1669

if not noclose:

2280

1670

# Close all standard open file descriptors

2281

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

1671

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

2282

1672

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

2283

1673

raise OSError(errno.ENODEV,

2284

"{0} not a character device"

2285

.format(os.devnull))

1674

"%s not a character device"

1675

% os.path.devnull)

2286

1676

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

2287

1677

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

2288

1678

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

2297

1687

2298

1688

parser = argparse.ArgumentParser()

2299

1689

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

2300

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

1690

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

2301

1691

help="show version number and exit")

2302

1692

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

2303

1693

help="Bind to interface IF")

2309

1699

help="Run self-test")

2310

1700

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

2311

1701

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

2312

" to terminal", default=None)

1702

" to terminal")

2313

1703

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

2314

1704

help="Debug level for stdout output")

2315

1705

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

2322

1712

" files")

2323

1713

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

2324

1714

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

2325

" system bus interface", default=None)

1715

" system bus interface")

2326

1716

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

2327

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

2328

default=None)

2329

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

2330

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

2331

" state", default=None)

2332

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

2333

help="Specify a file descriptor to a network"

2334

" socket to use instead of creating one")

2335

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

2336

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

2337

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

2338

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

2339

1717

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

2340

1718

options = parser.parse_args()

2341

1719

2342

1720

if options.check:

2350

1728

"port": "",

2351

1729

"debug": "False",

2352

1730

"priority":

2353

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

1731

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

2354

1732

"servicename": "Mandos",

2355

1733

"use_dbus": "True",

2356

1734

"use_ipv6": "True",

2357

1735

"debuglevel": "",

2358

"restore": "True",

2359

"socket": "",

2360

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

2361

"foreground": "False",

2362

1736

}

2363

1737

2364

1738

# Parse config file for server-global settings

2369

1743

# Convert the SafeConfigParser object to a dict

2370

1744

server_settings = server_config.defaults()

2371

1745

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

2372

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

1746

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

2373

1747

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

2374

1748

option)

2375

1749

if server_settings["port"]:

2376

1750

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

2377

1751

"port")

2378

if server_settings["socket"]:

2379

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

2380

"socket")

2381

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

2382

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

2383

# happen with a supplied network socket.

2384

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

2385

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

2386

["socket"])

2387

1752

del server_config

2388

1753

2389

1754

# Override the settings from the config file with command line

2390

1755

# options, if set.

2391

1756

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

2392

1757

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

2393

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

2394

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

1758

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

2395

1759

value = getattr(options, option)

2396

1760

if value is not None:

2397

1761

server_settings[option] = value

2400

1764

for option in server_settings.keys():

2401

1765

if type(server_settings[option]) is str:

2402

1766

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

2403

# Force all boolean options to be boolean

2404

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

2405

"foreground"):

2406

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

2407

# Debug implies foreground

2408

if server_settings["debug"]:

2409

server_settings["foreground"] = True

2410

1767

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

2411

1768

2412

1769

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

2416

1773

debuglevel = server_settings["debuglevel"]

2417

1774

use_dbus = server_settings["use_dbus"]

2418

1775

use_ipv6 = server_settings["use_ipv6"]

2419

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

2420

stored_state_file)

2421

foreground = server_settings["foreground"]

2422

2423

if debug:

2424

initlogger(debug, logging.DEBUG)

2425

else:

2426

if not debuglevel:

2427

initlogger(debug)

2428

else:

2429

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

2430

initlogger(debug, level)

2431

1776

2432

1777

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

2433

1778

syslogger.setFormatter(logging.Formatter

2434

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

2435

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

2436

.format(server_settings

2437

["servicename"])))

1779

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

1780

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

1781

% server_settings["servicename"]))

2438

1782

2439

1783

# Parse config file with clients

2440

client_config = configparser.SafeConfigParser(Client

2441

.client_defaults)

1784

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

1785

"extended_timeout": "15m",

1786

"interval": "2m",

1787

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

1788

"host": "",

1789

"approval_delay": "0s",

1790

"approval_duration": "1s",

1791

}

1792

client_config = configparser.SafeConfigParser(client_defaults)

2442

1793

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

2443

1794

"clients.conf"))

2444

1795

2453

1804

use_ipv6=use_ipv6,

2454

1805

gnutls_priority=

2455

1806

server_settings["priority"],

2456

use_dbus=use_dbus,

2457

socketfd=(server_settings["socket"]

2458

or None))

2459

if not foreground:

2460

pidfilename = "/run/mandos.pid"

2461

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

2462

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

2463

pidfile = None

1807

use_dbus=use_dbus)

1808

if not debug:

1809

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

2464

1810

try:

2465

1811

pidfile = open(pidfilename, "w")

2466

except IOError as e:

2467

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

2468

exc_info=e)

1812

except IOError:

1813

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

2469

1814

2470

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

1815

try:

1816

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

1817

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

1818

except KeyError:

2471

1819

try:

2472

uid = pwd.getpwnam(name).pw_uid

2473

gid = pwd.getpwnam(name).pw_gid

2474

break

1820

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

1821

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

2475

1822

except KeyError:

2476

continue

2477

else:

2478

uid = 65534

2479

gid = 65534

1823

try:

1824

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

1825

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

1826

except KeyError:

1827

uid = 65534

1828

gid = 65534

2480

1829

try:

2481

1830

os.setgid(gid)

2482

1831

os.setuid(uid)

2483

1832

except OSError as error:

2484

if error.errno != errno.EPERM:

2485

raise

1833

if error[0] != errno.EPERM:

1834

raise error

2486

1835

1836

if not debug and not debuglevel:

1837

syslogger.setLevel(logging.WARNING)

1838

console.setLevel(logging.WARNING)

1839

if debuglevel:

1840

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

1841

syslogger.setLevel(level)

1842

console.setLevel(level)

1843

2487

1844

if debug:

2488

1845

# Enable all possible GnuTLS debugging

2489

1846

2499

1856

.gnutls_global_set_log_function(debug_gnutls))

2500

1857

2501

1858

# Redirect stdin so all checkers get /dev/null

2502

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

1859

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

2503

1860

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

2504

1861

if null > 2:

2505

1862

os.close(null)

1863

else:

1864

# No console logging

1865

logger.removeHandler(console)

2506

1866

2507

1867

# Need to fork before connecting to D-Bus

2508

if not foreground:

1868

if not debug:

2509

1869

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

2510

1870

daemon()

2511

1871

2512

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

2513

# need to inform gobject that threads will be used.

2514

gobject.threads_init()

2515

2516

1872

global main_loop

2517

1873

# From the Avahi example code

2518

DBusGMainLoop(set_as_default=True)

1874

DBusGMainLoop(set_as_default=True )

2519

1875

main_loop = gobject.MainLoop()

2520

1876

bus = dbus.SystemBus()

2521

1877

# End of Avahi example code

2522

1878

if use_dbus:

2523

1879

try:

2524

bus_name = dbus.service.BusName("se.recompile.Mandos",

1880

bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",

2525

1881

bus, do_not_queue=True)

2526

old_bus_name = (dbus.service.BusName

2527

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

2528

do_not_queue=True))

2529

1882

except dbus.exceptions.NameExistsException as e:

2530

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

1883

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

2531

1884

use_dbus = False

2532

1885

server_settings["use_dbus"] = False

2533

1886

tcp_server.use_dbus = False

2534

1887

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2535

service = AvahiServiceToSyslog(name =

2536

server_settings["servicename"],

2537

servicetype = "_mandos._tcp",

2538

protocol = protocol, bus = bus)

1888

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

1889

servicetype = "_mandos._tcp",

1890

protocol = protocol, bus = bus)

2539

1891

if server_settings["interface"]:

2540

1892

service.interface = (if_nametoindex

2541

1893

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

2546

1898

client_class = Client

2547

1899

if use_dbus:

2548

1900

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

2549

2550

client_settings = Client.config_parser(client_config)

2551

old_client_settings = {}

2552

clients_data = {}

2553

2554

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

2555

global wnull

2556

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

2557

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

2558

# mode

2559

if debug or not foreground:

2560

wnull.close()

2561

2562

# Get client data and settings from last running state.

2563

if server_settings["restore"]:

2564

try:

2565

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

2566

clients_data, old_client_settings = (pickle.load

2567

(stored_state))

2568

os.remove(stored_state_path)

2569

except IOError as e:

2570

if e.errno == errno.ENOENT:

2571

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

2572

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

2573

else:

2574

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

2575

exc_info=e)

2576

raise

2577

except EOFError as e:

2578

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

2579

"EOFError:", exc_info=e)

2580

2581

with PGPEngine() as pgp:

2582

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2587

# Decide which value to use after restoring saved state.

2588

# We have three different values: Old config file,

2589

# new config file, and saved state.

2590

# New config value takes precedence if it differs from old

2591

# config value, otherwise use saved state.

2592

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

2593

try:

2594

# For each value in new config, check if it

2595

# differs from the old config value (Except for

2596

# the "secret" attribute)

2597

if (name != "secret" and

2598

value != old_client_settings[client_name]

2599

[name]):

2600

client[name] = value

2601

except KeyError:

2602

pass

2603

2604

# Clients who has passed its expire date can still be

2605

# enabled if its last checker was successful. Clients

2606

# whose checker succeeded before we stored its state is

2607

# assumed to have successfully run all checkers during

2608

# downtime.

2609

if client["enabled"]:

2610

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

2611

if not client["last_checked_ok"]:

2612

logger.warning(

2613

"disabling client {0} - Client never "

2614

"performed a successful checker"

2615

.format(client_name))

2616

client["enabled"] = False

2617

elif client["last_checker_status"] != 0:

2618

logger.warning(

2619

"disabling client {0} - Client "

2620

"last checker failed with error code {1}"

2621

.format(client_name,

2622

client["last_checker_status"]))

2623

client["enabled"] = False

2624

else:

2625

client["expires"] = (datetime.datetime

2626

.utcnow()

2627

+ client["timeout"])

2628

logger.debug("Last checker succeeded,"

2629

" keeping {0} enabled"

2630

.format(client_name))

1901

def client_config_items(config, section):

1902

special_settings = {

1903

"approved_by_default":

1904

lambda: config.getboolean(section,

1905

"approved_by_default"),

1906

}

1907

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

2631

1908

try:

2632

client["secret"] = (

2633

pgp.decrypt(client["encrypted_secret"],

2634

client_settings[client_name]

2635

["secret"]))

2636

except PGPError:

2637

# If decryption fails, we use secret from new settings

2638

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

2639

.format(client_name))

2640

client["secret"] = (

2641

client_settings[client_name]["secret"])

2642

2643

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

2644

for client_name in (set(old_client_settings)

2645

- set(client_settings)):

2646

del clients_data[client_name]

2647

for client_name in (set(client_settings)

2648

- set(old_client_settings)):

2649

clients_data[client_name] = client_settings[client_name]

2650

2651

# Create all client objects

2652

for client_name, client in clients_data.iteritems():

2653

tcp_server.clients[client_name] = client_class(

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2656

1909

yield (name, special_settings[name]())

1910

except KeyError:

1911

yield (name, value)

1912

1913

tcp_server.clients.update(set(

1914

client_class(name = section,

1915

config= dict(client_config_items(

1916

client_config, section)))

1917

for section in client_config.sections()))

2657

1918

if not tcp_server.clients:

2658

1919

logger.warning("No clients defined")

2659

2660

if not foreground:

2661

if pidfile is not None:

2662

try:

2663

with pidfile:

2664

pid = os.getpid()

2665

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

2666

except IOError:

2667

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

2668

pidfilename, pid)

2669

del pidfile

1920

1921

if not debug:

1922

try:

1923

with pidfile:

1924

pid = os.getpid()

1925

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

1926

del pidfile

1927

except IOError:

1928

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

1929

pidfilename, pid)

1930

except NameError:

1931

# "pidfile" was never created

1932

pass

2670

1933

del pidfilename

2671

1934

1935

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

1936

2672

1937

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

2673

1938

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

2674

1939

2675

1940

if use_dbus:

2676

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

2677

"se.bsnet.fukt.Mandos"})

2678

class MandosDBusService(DBusObjectWithProperties):

1941

class MandosDBusService(dbus.service.Object):

2679

1942

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

2680

1943

def __init__(self):

2681

1944

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

2682

_interface = "se.recompile.Mandos"

2683

2684

@dbus_interface_annotations(_interface)

2685

def _foo(self):

2686

return { "org.freedesktop.DBus.Property"

2687

".EmitsChangedSignal":

2688

"false"}

1945

_interface = "se.bsnet.fukt.Mandos"

2689

1946

2690

1947

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

2691

1948

def ClientAdded(self, objpath):

2706

1963

def GetAllClients(self):

2707

1964

"D-Bus method"

2708

1965

return dbus.Array(c.dbus_object_path

2709

for c in

2710

tcp_server.clients.itervalues())

1966

for c in tcp_server.clients)

2711

1967

2712

1968

@dbus.service.method(_interface,

2713

1969

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

2715

1971

"D-Bus method"

2716

1972

return dbus.Dictionary(

2717

1973

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

2718

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

1974

for c in tcp_server.clients),

2719

1975

signature="oa{sv}")

2720

1976

2721

1977

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

2722

1978

def RemoveClient(self, object_path):

2723

1979

"D-Bus method"

2724

for c in tcp_server.clients.itervalues():

1980

for c in tcp_server.clients:

2725

1981

if c.dbus_object_path == object_path:

2726

del tcp_server.clients[c.name]

1982

tcp_server.clients.remove(c)

2727

1983

c.remove_from_connection()

2728

1984

# Don't signal anything except ClientRemoved

2729

1985

c.disable(quiet=True)

2740

1996

"Cleanup function; run on exit"

2741

1997

service.cleanup()

2742

1998

2743

multiprocessing.active_children()

2744

wnull.close()

2745

if not (tcp_server.clients or client_settings):

2746

return

2747

2748

# Store client before exiting. Secrets are encrypted with key

2749

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

2750

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

2751

clients = {}

2752

with PGPEngine() as pgp:

2753

for client in tcp_server.clients.itervalues():

2754

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

2755

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

2756

key)

2757

client_dict = {}

2758

2759

# A list of attributes that can not be pickled

2760

# + secret.

2761

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

2762

"checker", "server_settings"))

2763

for name, typ in (inspect.getmembers

2764

(dbus.service.Object)):

2765

exclude.add(name)

2766

2767

client_dict["encrypted_secret"] = (client

2768

.encrypted_secret)

2769

for attr in client.client_structure:

2770

if attr not in exclude:

2771

client_dict[attr] = getattr(client, attr)

2772

2773

clients[client.name] = client_dict

2774

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

2775

2776

try:

2777

with (tempfile.NamedTemporaryFile

2778

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

2779

dir=os.path.dirname(stored_state_path),

2780

delete=False)) as stored_state:

2781

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

2782

tempname=stored_state.name

2783

os.rename(tempname, stored_state_path)

2784

except (IOError, OSError) as e:

2785

if not debug:

2786

try:

2787

os.remove(tempname)

2788

except NameError:

2789

pass

2790

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

2791

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

2792

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

2793

else:

2794

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

2795

exc_info=e)

2796

raise

2797

2798

# Delete all clients, and settings from config

2799

1999

while tcp_server.clients:

2800

name, client = tcp_server.clients.popitem()

2000

client = tcp_server.clients.pop()

2801

2001

if use_dbus:

2802

2002

client.remove_from_connection()

2003

client.disable_hook = None

2803

2004

# Don't signal anything except ClientRemoved

2804

2005

client.disable(quiet=True)

2805

2006

if use_dbus:

2806

2007

# Emit D-Bus signal

2807

mandos_dbus_service.ClientRemoved(client

2808

.dbus_object_path,

2008

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2809

2009

client.name)

2810

client_settings.clear()

2811

2010

2812

2011

atexit.register(cleanup)

2813

2012

2814

for client in tcp_server.clients.itervalues():

2013

for client in tcp_server.clients:

2815

2014

if use_dbus:

2816

2015

# Emit D-Bus signal

2817

2016

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2818

# Need to initiate checking of clients

2819

if client.enabled:

2820

client.init_checker()

2017

client.enable()

2821

2018

2822

2019

tcp_server.enable()

2823

2020

tcp_server.server_activate()

2826

2023

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

2827

2024

if use_ipv6:

2828

2025

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

2829

" flowinfo %d, scope_id %d",

2830

*tcp_server.socket.getsockname())

2026

" flowinfo %d, scope_id %d"

2027

% tcp_server.socket.getsockname())

2831

2028

else: # IPv4

2832

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

2833

*tcp_server.socket.getsockname())

2029

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

2030

% tcp_server.socket.getsockname())

2834

2031

2835

2032

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

2836

2033

2839

2036

try:

2840

2037

service.activate()

2841

2038

except dbus.exceptions.DBusException as error:

2842

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

2039

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

2843

2040

cleanup()

2844

2041

sys.exit(1)

2845

2042

# End of Avahi example code

2852

2049

logger.debug("Starting main loop")

2853

2050

main_loop.run()

2854

2051

except AvahiError as error:

2855

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

2052

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

2856

2053

cleanup()

2857

2054

sys.exit(1)

2858

2055

except KeyboardInterrupt: