/mandos/trunk : revision 713

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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@fukt.bsnet.se>.

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# Contact the authors at <mandos@recompile.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 = "1.3.1"

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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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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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version = "1.6.6"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = None

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler

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(facility =

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logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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class AvahiError(Exception):

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

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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" 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.GetAlternativeServiceName(self.name))

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self .entry_group_state_changed))

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'StateChanged', self.entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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

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.format(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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dbus.exceptions.DBusException):

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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

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def _timedelta_to_milliseconds(td):

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_enabled: datetime.datetime(); (UTC)

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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

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

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"last_approval_request", "last_checked_ok",

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.timeout)

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return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.extended_timeout)

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return timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.interval)

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return timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return _timedelta_to_milliseconds(self.approval_delay)

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

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

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

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attribute."""

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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self.name = name

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if config is None:

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config = {}

535

if server_settings is None:

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server_settings = {}

537

self.server_settings = server_settings

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# adding all client settings

539

for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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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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

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(config["secfile"])),

351

"rb") as secfile:

352

self.secret = secfile.read()

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else:

354

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

557

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

558

datetime.datetime.utcnow())

559

560

# attributes specific for this server instance

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self.checker = None

367

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

369

self.expires = None

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self.checker_callback_tag = None

371

self.checker_command = config["checker"]

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self.current_checker_command = None

373

self.last_connect = None

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self._approved = None

375

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

376

True)

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self.approved = None

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self.approvals_pending = 0

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"])

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

568

self.changedstate = (multiprocessing_manager

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.Condition(multiprocessing_manager

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.Lock()))

571

self.client_structure = [attr for attr in

572

self.__dict__.iterkeys()

573

if not attr.startswith("_")]

574

self.client_structure.append("client_structure")

575

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

577

lambda obj:

578

isinstance(obj,

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property)):

580

if not name.startswith("_"):

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self.client_structure.append(name)

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# Send notice to process children that client state has changed

384

584

def send_changedstate(self):

385

self.changedstate.acquire()

386

self.changedstate.notify_all()

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self.changedstate.release()

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with self.changedstate:

586

self.changedstate.notify_all()

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def enable(self):

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

391

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

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# Already enabled

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return

593

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

594

self.enabled = True

595

self.last_enabled = datetime.datetime.utcnow()

596

self.init_checker()

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597

self.send_changedstate()

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599

def disable(self, quiet=True):

600

"""Disable this client."""

601

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

602

return False

603

if not quiet:

604

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

605

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

606

gobject.source_remove(self.disable_initiator_tag)

607

self.disable_initiator_tag = None

608

self.expires = None

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

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gobject.source_remove(self.checker_initiator_tag)

611

self.checker_initiator_tag = None

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self.stop_checker()

613

self.enabled = False

614

if not quiet:

615

self.send_changedstate()

616

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

617

return False

618

619

def __del__(self):

620

self.disable()

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622

def init_checker(self):

395

623

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

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# and every interval from then on.

625

if self.checker_initiator_tag is not None:

626

gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = (gobject.timeout_add

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(self.interval_milliseconds(),

399

629

self.start_checker))

400

630

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

401

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

631

if self.disable_initiator_tag is not None:

632

gobject.source_remove(self.disable_initiator_tag)

402

633

self.disable_initiator_tag = (gobject.timeout_add

403

634

(self.timeout_milliseconds(),

404

635

self.disable))

405

self.enabled = True

406

self.last_enabled = datetime.datetime.utcnow()

407

636

# Also start a new checker *right now*.

408

637

self.start_checker()

409

638

410

def disable(self, quiet=True):

411

"""Disable this client."""

412

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

413

return False

414

if not quiet:

415

self.send_changedstate()

416

if not quiet:

417

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

418

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

419

gobject.source_remove(self.disable_initiator_tag)

420

self.disable_initiator_tag = None

421

self.expires = None

422

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

423

gobject.source_remove(self.checker_initiator_tag)

424

self.checker_initiator_tag = None

425

self.stop_checker()

426

if self.disable_hook:

427

self.disable_hook(self)

428

self.enabled = False

429

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

430

return False

431

432

def __del__(self):

433

self.disable_hook = None

434

self.disable()

435

436

639

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

437

640

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

438

641

self.checker_callback_tag = None

439

642

self.checker = None

440

643

if os.WIFEXITED(condition):

441

exitstatus = os.WEXITSTATUS(condition)

442

if exitstatus == 0:

644

self.last_checker_status = os.WEXITSTATUS(condition)

645

if self.last_checker_status == 0:

443

646

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

444

647

vars(self))

445

648

self.checked_ok()

447

650

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

448

651

vars(self))

449

652

else:

653

self.last_checker_status = -1

450

654

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

451

655

vars(self))

452

656

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

"""

657

def checked_ok(self):

658

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

659

self.last_checked_ok = datetime.datetime.utcnow()

660

self.last_checker_status = 0

661

self.bump_timeout()

662

663

def bump_timeout(self, timeout=None):

664

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

459

665

if timeout is None:

460

666

timeout = self.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))

667

if self.disable_initiator_tag is not None:

668

gobject.source_remove(self.disable_initiator_tag)

669

self.disable_initiator_tag = None

670

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

671

self.disable_initiator_tag = (gobject.timeout_add

672

(timedelta_to_milliseconds

673

(timeout), self.disable))

674

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

467

675

468

676

def need_approval(self):

469

677

self.last_approval_request = datetime.datetime.utcnow()

474

682

If a checker already exists, leave it running and do

475

683

nothing."""

476

684

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

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

685

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

686

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

687

# would inevitably timeout, since no checker would get a

688

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

481

689

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

482

690

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

483

691

# should be.

485

693

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

486

694

try:

487

695

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

488

except (AttributeError, OSError) as error:

489

if (isinstance(error, OSError)

490

and error.errno != errno.ECHILD):

491

raise error

696

except AttributeError:

697

pass

698

except OSError as error:

699

if error.errno != errno.ECHILD:

700

raise

492

701

else:

493

702

if pid:

494

703

logger.warning("Checker was a zombie")

497

706

self.current_checker_command)

498

707

# Start a new checker if needed

499

708

if self.checker is None:

709

# Escape attributes for the shell

710

escaped_attrs = dict(

711

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

712

for attr in

713

self.runtime_expansions)

500

714

try:

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

715

command = self.checker_command % escaped_attrs

716

except TypeError as error:

717

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

718

self.checker_command, exc_info=error)

719

return True # Try again later

519

720

self.current_checker_command = command

520

721

try:

521

722

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

524

725

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

525

726

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

526

727

# always replaced by /dev/null.)

728

# The exception is when not debugging but nevertheless

729

# running in the foreground; use the previously

730

# created wnull.

731

popen_args = {}

732

if (not self.server_settings["debug"]

733

and self.server_settings["foreground"]):

734

popen_args.update({"stdout": wnull,

735

"stderr": wnull })

527

736

self.checker = subprocess.Popen(command,

528

737

close_fds=True,

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.

738

shell=True, cwd="/",

739

**popen_args)

740

except OSError as error:

741

logger.error("Failed to start subprocess",

742

exc_info=error)

743

return True

744

self.checker_callback_tag = (gobject.child_watch_add

745

(self.checker.pid,

746

self.checker_callback,

747

data=command))

748

# The checker may have completed before the gobject

749

# watch was added. Check for this.

750

try:

536

751

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)

540

752

except OSError as error:

541

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

542

error)

753

if error.errno == errno.ECHILD:

754

# This should never happen

755

logger.error("Child process vanished",

756

exc_info=error)

757

return True

758

raise

759

if pid:

760

gobject.source_remove(self.checker_callback_tag)

761

self.checker_callback(pid, status, command)

543

762

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

544

763

return True

545

764

552

771

return

553

772

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

554

773

try:

555

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

774

self.checker.terminate()

556

775

#time.sleep(0.5)

557

776

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

558

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

777

# self.checker.kill()

559

778

except OSError as error:

560

779

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

561

780

raise

578

797

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

579

798

if byte_arrays and signature != "ay":

580

799

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

581

" signature %r" % signature)

800

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

582

801

def decorator(func):

583

802

func._dbus_is_property = True

584

803

func._dbus_interface = dbus_interface

592

811

return decorator

593

812

594

813

814

def dbus_interface_annotations(dbus_interface):

815

"""Decorator for marking functions returning interface annotations

816

817

Usage:

818

819

@dbus_interface_annotations("org.example.Interface")

820

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

821

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

822

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

823

"false"}

824

"""

825

def decorator(func):

826

func._dbus_is_interface = True

827

func._dbus_interface = dbus_interface

828

func._dbus_name = dbus_interface

829

return func

830

return decorator

831

832

833

def dbus_annotations(annotations):

834

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

835

Usage:

836

837

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

838

access="r")

839

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

840

"org.freedesktop.DBus.Property."

841

"EmitsChangedSignal": "false"})

842

def Property_dbus_property(self):

843

return dbus.Boolean(False)

844

"""

845

def decorator(func):

846

func._dbus_annotations = annotations

847

return func

848

return decorator

849

850

595

851

class DBusPropertyException(dbus.exceptions.DBusException):

596

852

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

597

853

"""

620

876

"""

621

877

622

878

@staticmethod

623

def _is_dbus_property(obj):

624

return getattr(obj, "_dbus_is_property", False)

879

def _is_dbus_thing(thing):

880

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

881

882

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

883

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

884

"""

885

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

886

False)

625

887

626

def _get_all_dbus_properties(self):

888

def _get_all_dbus_things(self, thing):

627

889

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

628

890

"""

629

return ((prop._dbus_name, prop)

630

for name, prop in

631

inspect.getmembers(self, self._is_dbus_property))

891

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

892

name),

893

athing.__get__(self))

894

for cls in self.__class__.__mro__

895

for name, athing in

896

inspect.getmembers(cls,

897

self._is_dbus_thing(thing)))

632

898

633

899

def _get_dbus_property(self, interface_name, property_name):

634

900

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

635

901

property with the specified name and interface.

636

902

"""

637

for name in (property_name,

638

property_name + "_dbus_property"):

639

prop = getattr(self, name, None)

640

if (prop is None

641

or not self._is_dbus_property(prop)

642

or prop._dbus_name != property_name

643

or (interface_name and prop._dbus_interface

644

and interface_name != prop._dbus_interface)):

645

continue

646

return prop

903

for cls in self.__class__.__mro__:

904

for name, value in (inspect.getmembers

905

(cls,

906

self._is_dbus_thing("property"))):

907

if (value._dbus_name == property_name

908

and value._dbus_interface == interface_name):

909

return value.__get__(self)

910

647

911

# No such property

648

912

raise DBusPropertyNotFound(self.dbus_object_path + ":"

649

913

+ interface_name + "."

673

937

# The byte_arrays option is not supported yet on

674

938

# signatures other than "ay".

675

939

if prop._dbus_signature != "ay":

676

raise ValueError

677

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

678

for byte in value))

940

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

941

"'ay' signature {0!r}"

942

.format(prop._dbus_signature))

943

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

944

for byte in value))

679

945

prop(value)

680

946

681

947

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

686

952

687

953

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

688

954

"""

689

all = {}

690

for name, prop in self._get_all_dbus_properties():

955

properties = {}

956

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

691

957

if (interface_name

692

958

and interface_name != prop._dbus_interface):

693

959

# Interface non-empty but did not match

697

963

continue

698

964

value = prop()

699

965

if not hasattr(value, "variant_level"):

700

all[name] = value

966

properties[name] = value

701

967

continue

702

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

703

value.variant_level+1)

704

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

968

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

969

value.variant_level+1)

970

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

705

971

706

972

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

707

973

out_signature="s",

708

974

path_keyword='object_path',

709

975

connection_keyword='connection')

710

976

def Introspect(self, object_path, connection):

711

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

977

"""Overloading of standard D-Bus method.

978

979

Inserts property tags and interface annotation tags.

712

980

"""

713

981

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

714

982

connection)

721

989

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

722

990

return e

723

991

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

992

# Add property tags

724

993

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

725

994

for name, prop

726

in self._get_all_dbus_properties()

995

in self._get_all_dbus_things("property")

727

996

if prop._dbus_interface

728

997

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

729

998

if_tag.appendChild(tag)

999

# Add annotation tags

1000

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

1001

for tag in if_tag.getElementsByTagName(typ):

1002

annots = dict()

1003

for name, prop in (self.

1004

_get_all_dbus_things(typ)):

1005

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

1006

and prop._dbus_interface

1007

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

1008

annots.update(getattr

1009

(prop,

1010

"_dbus_annotations",

1011

{}))

1012

for name, value in annots.iteritems():

1013

ann_tag = document.createElement(

1014

"annotation")

1015

ann_tag.setAttribute("name", name)

1016

ann_tag.setAttribute("value", value)

1017

tag.appendChild(ann_tag)

1018

# Add interface annotation tags

1019

for annotation, value in dict(

1020

itertools.chain.from_iterable(

1021

annotations().iteritems()

1022

for name, annotations in

1023

self._get_all_dbus_things("interface")

1024

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

1025

)).iteritems():

1026

ann_tag = document.createElement("annotation")

1027

ann_tag.setAttribute("name", annotation)

1028

ann_tag.setAttribute("value", value)

1029

if_tag.appendChild(ann_tag)

730

1030

# Add the names to the return values for the

731

1031

# "org.freedesktop.DBus.Properties" methods

732

1032

if (if_tag.getAttribute("name")

747

1047

except (AttributeError, xml.dom.DOMException,

748

1048

xml.parsers.expat.ExpatError) as error:

749

1049

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

750

error)

1050

exc_info=error)

751

1051

return xmlstring

752

1052

753

1053

754

def datetime_to_dbus (dt, variant_level=0):

1054

def datetime_to_dbus(dt, variant_level=0):

755

1055

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

756

1056

if dt is None:

757

1057

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

759

1059

variant_level=variant_level)

760

1060

761

1061

1062

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1063

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

1064

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

1065

interface names according to the "alt_interface_names" mapping.

1066

Usage:

1067

1068

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

1069

"net.example.AlternateInterface"})

1070

class SampleDBusObject(dbus.service.Object):

1071

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

1072

def SampleDBusMethod():

1073

pass

1074

1075

The above "SampleDBusMethod" on "SampleDBusObject" will be

1076

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

1077

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

1078

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

1079

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

1080

1081

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

1082

(from DBusObjectWithProperties) and interfaces (from the

1083

dbus_interface_annotations decorator).

1084

"""

1085

def wrapper(cls):

1086

for orig_interface_name, alt_interface_name in (

1087

alt_interface_names.iteritems()):

1088

attr = {}

1089

interface_names = set()

1090

# Go though all attributes of the class

1091

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

1092

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

1093

# with the wrong interface name

1094

if (not hasattr(attribute, "_dbus_interface")

1095

or not attribute._dbus_interface

1096

.startswith(orig_interface_name)):

1097

continue

1098

# Create an alternate D-Bus interface name based on

1099

# the current name

1100

alt_interface = (attribute._dbus_interface

1101

.replace(orig_interface_name,

1102

alt_interface_name))

1103

interface_names.add(alt_interface)

1104

# Is this a D-Bus signal?

1105

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

1106

# Extract the original non-method undecorated

1107

# function by black magic

1108

nonmethod_func = (dict(

1109

zip(attribute.func_code.co_freevars,

1110

attribute.__closure__))["func"]

1111

.cell_contents)

1112

# Create a new, but exactly alike, function

1113

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

1114

# with the alternate D-Bus interface name

1115

new_function = (dbus.service.signal

1116

(alt_interface,

1117

attribute._dbus_signature)

1118

(types.FunctionType(

1119

nonmethod_func.func_code,

1120

nonmethod_func.func_globals,

1121

nonmethod_func.func_name,

1122

nonmethod_func.func_defaults,

1123

nonmethod_func.func_closure)))

1124

# Copy annotations, if any

1125

try:

1126

new_function._dbus_annotations = (

1127

dict(attribute._dbus_annotations))

1128

except AttributeError:

1129

pass

1130

# Define a creator of a function to call both the

1131

# original and alternate functions, so both the

1132

# original and alternate signals gets sent when

1133

# the function is called

1134

def fixscope(func1, func2):

1135

"""This function is a scope container to pass

1136

func1 and func2 to the "call_both" function

1137

outside of its arguments"""

1138

def call_both(*args, **kwargs):

1139

"""This function will emit two D-Bus

1140

signals by calling func1 and func2"""

1141

func1(*args, **kwargs)

1142

func2(*args, **kwargs)

1143

return call_both

1144

# Create the "call_both" function and add it to

1145

# the class

1146

attr[attrname] = fixscope(attribute, new_function)

1147

# Is this a D-Bus method?

1148

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

1149

# Create a new, but exactly alike, function

1150

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

1151

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

1152

# to the class.

1153

attr[attrname] = (dbus.service.method

1154

(alt_interface,

1155

attribute._dbus_in_signature,

1156

attribute._dbus_out_signature)

1157

(types.FunctionType

1158

(attribute.func_code,

1159

attribute.func_globals,

1160

attribute.func_name,

1161

attribute.func_defaults,

1162

attribute.func_closure)))

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1169

# Is this a D-Bus property?

1170

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

1171

# Create a new, but exactly alike, function

1172

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

1173

# property with the alternate D-Bus interface

1174

# name. Add it to the class.

1175

attr[attrname] = (dbus_service_property

1176

(alt_interface,

1177

attribute._dbus_signature,

1178

attribute._dbus_access,

1179

attribute

1180

._dbus_get_args_options

1181

["byte_arrays"])

1182

(types.FunctionType

1183

(attribute.func_code,

1184

attribute.func_globals,

1185

attribute.func_name,

1186

attribute.func_defaults,

1187

attribute.func_closure)))

1188

# Copy annotations, if any

1189

try:

1190

attr[attrname]._dbus_annotations = (

1191

dict(attribute._dbus_annotations))

1192

except AttributeError:

1193

pass

1194

# Is this a D-Bus interface?

1195

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

1196

# Create a new, but exactly alike, function

1197

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

1198

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

1199

# to the class.

1200

attr[attrname] = (dbus_interface_annotations

1201

(alt_interface)

1202

(types.FunctionType

1203

(attribute.func_code,

1204

attribute.func_globals,

1205

attribute.func_name,

1206

attribute.func_defaults,

1207

attribute.func_closure)))

1208

if deprecate:

1209

# Deprecate all alternate interfaces

1210

iname="_AlternateDBusNames_interface_annotation{0}"

1211

for interface_name in interface_names:

1212

@dbus_interface_annotations(interface_name)

1213

def func(self):

1214

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

1215

"true" }

1216

# Find an unused name

1217

for aname in (iname.format(i)

1218

for i in itertools.count()):

1219

if aname not in attr:

1220

attr[aname] = func

1221

break

1222

if interface_names:

1223

# Replace the class with a new subclass of it with

1224

# methods, signals, etc. as created above.

1225

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

1226

(cls,), attr)

1227

return cls

1228

return wrapper

1229

1230

1231

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

1232

"se.bsnet.fukt.Mandos"})

762

1233

class ClientDBus(Client, DBusObjectWithProperties):

763

1234

"""A Client class using D-Bus

764

1235

773

1244

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

774

1245

775

1246

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

776

self._approvals_pending = 0

777

1247

self.bus = bus

778

1248

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

779

1249

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

785

1255

("/clients/" + client_object_name))

786

1256

DBusObjectWithProperties.__init__(self, self.bus,

787

1257

self.dbus_object_path)

788

1258

789

1259

def notifychangeproperty(transform_func,

790

1260

dbus_name, type_func=lambda x: x,

791

1261

variant_level=1):

792

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

793

changes to DBus.

794

transform_fun: Function that takes a value and transform it to

795

DBus type.

796

dbus_name: DBus name of the variable

1262

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

1263

its changes to DBus.

1264

1265

transform_fun: Function that takes a value and a variant_level

1266

and transforms it to a D-Bus type.

1267

dbus_name: D-Bus name of the variable

797

1268

type_func: Function that transform the value before sending it

798

to DBus

799

variant_level: DBus variant level. default: 1

1269

to the D-Bus. Default: no transform

1270

variant_level: D-Bus variant level. Default: 1

800

1271

"""

801

real_value = [None,]

1272

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

802

1273

def setter(self, value):

803

old_value = real_value[0]

804

real_value[0] = value

805

1274

if hasattr(self, "dbus_object_path"):

806

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

807

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

808

variant_level)

1275

if (not hasattr(self, attrname) or

1276

type_func(getattr(self, attrname, None))

1277

!= type_func(value)):

1278

dbus_value = transform_func(type_func(value),

1279

variant_level

1280

=variant_level)

809

1281

self.PropertyChanged(dbus.String(dbus_name),

810

1282

dbus_value)

1283

setattr(self, attrname, value)

811

1284

812

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

813

1285

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

814

1286

815

1287

expires = notifychangeproperty(datetime_to_dbus, "Expires")

816

1288

approvals_pending = notifychangeproperty(dbus.Boolean,

820

1292

last_enabled = notifychangeproperty(datetime_to_dbus,

821

1293

"LastEnabled")

822

1294

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

823

type_func = lambda checker: checker is not None)

1295

type_func = lambda checker:

1296

checker is not None)

824

1297

last_checked_ok = notifychangeproperty(datetime_to_dbus,

825

1298

"LastCheckedOK")

826

last_approval_request = notifychangeproperty(datetime_to_dbus,

827

"LastApprovalRequest")

1299

last_checker_status = notifychangeproperty(dbus.Int16,

1300

"LastCheckerStatus")

1301

last_approval_request = notifychangeproperty(

1302

datetime_to_dbus, "LastApprovalRequest")

828

1303

approved_by_default = notifychangeproperty(dbus.Boolean,

829

1304

"ApprovedByDefault")

830

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

831

type_func = _timedelta_to_milliseconds)

832

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

833

type_func = _timedelta_to_milliseconds)

1305

approval_delay = notifychangeproperty(dbus.UInt64,

1306

"ApprovalDelay",

1307

type_func =

1308

timedelta_to_milliseconds)

1309

approval_duration = notifychangeproperty(

1310

dbus.UInt64, "ApprovalDuration",

1311

type_func = timedelta_to_milliseconds)

834

1312

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

835

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

836

type_func = _timedelta_to_milliseconds)

837

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

838

type_func = _timedelta_to_milliseconds)

839

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

840

type_func = _timedelta_to_milliseconds)

1313

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

1314

type_func =

1315

timedelta_to_milliseconds)

1316

extended_timeout = notifychangeproperty(

1317

dbus.UInt64, "ExtendedTimeout",

1318

type_func = timedelta_to_milliseconds)

1319

interval = notifychangeproperty(dbus.UInt64,

1320

"Interval",

1321

type_func =

1322

timedelta_to_milliseconds)

841

1323

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

842

1324

843

1325

del notifychangeproperty

871

1353

*args, **kwargs)

872

1354

873

1355

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

874

old_checker = self.checker

875

if self.checker is not None:

876

old_checker_pid = self.checker.pid

877

else:

878

old_checker_pid = None

1356

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

879

1357

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

880

1358

# Only if new checker process was started

881

1359

if (self.checker is not None

885

1363

return r

886

1364

887

1365

def _reset_approved(self):

888

self._approved = None

1366

self.approved = None

889

1367

return False

890

1368

891

1369

def approve(self, value=True):

892

self.send_changedstate()

893

self._approved = value

894

gobject.timeout_add(_timedelta_to_milliseconds

1370

self.approved = value

1371

gobject.timeout_add(timedelta_to_milliseconds

895

1372

(self.approval_duration),

896

1373

self._reset_approved)

897

1374

self.send_changedstate()

898

1375

899

1376

## D-Bus methods, signals & properties

900

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

1377

_interface = "se.recompile.Mandos.Client"

1378

1379

## Interfaces

1380

1381

@dbus_interface_annotations(_interface)

1382

def _foo(self):

1383

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

1384

"false"}

901

1385

902

1386

## Signals

903

1387

1003

1487

access="readwrite")

1004

1488

def ApprovalDuration_dbus_property(self, value=None):

1005

1489

if value is None: # get

1006

return dbus.UInt64(_timedelta_to_milliseconds(

1490

return dbus.UInt64(timedelta_to_milliseconds(

1007

1491

self.approval_duration))

1008

1492

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

1009

1493

1023

1507

def Host_dbus_property(self, value=None):

1024

1508

if value is None: # get

1025

1509

return dbus.String(self.host)

1026

self.host = value

1510

self.host = unicode(value)

1027

1511

1028

1512

# Created - property

1029

1513

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

1030

1514

def Created_dbus_property(self):

1031

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

1515

return datetime_to_dbus(self.created)

1032

1516

1033

1517

# LastEnabled - property

1034

1518

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

1055

1539

return

1056

1540

return datetime_to_dbus(self.last_checked_ok)

1057

1541

1542

# LastCheckerStatus - property

1543

@dbus_service_property(_interface, signature="n",

1544

access="read")

1545

def LastCheckerStatus_dbus_property(self):

1546

return dbus.Int16(self.last_checker_status)

1547

1058

1548

# Expires - property

1059

1549

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

1060

1550

def Expires_dbus_property(self):

1071

1561

def Timeout_dbus_property(self, value=None):

1072

1562

if value is None: # get

1073

1563

return dbus.UInt64(self.timeout_milliseconds())

1564

old_timeout = self.timeout

1074

1565

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

1075

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

1076

return

1077

# Reschedule timeout

1078

gobject.source_remove(self.disable_initiator_tag)

1079

self.disable_initiator_tag = None

1080

self.expires = None

1081

time_to_die = (self.

1082

_timedelta_to_milliseconds((self

1083

.last_checked_ok

1084

+ self.timeout)

1085

- datetime.datetime

1086

.utcnow()))

1087

if time_to_die <= 0:

1088

# The timeout has passed

1089

self.disable()

1090

else:

1091

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

1092

+ datetime.timedelta(milliseconds = time_to_die))

1093

self.disable_initiator_tag = (gobject.timeout_add

1094

(time_to_die, self.disable))

1566

# Reschedule disabling

1567

if self.enabled:

1568

now = datetime.datetime.utcnow()

1569

self.expires += self.timeout - old_timeout

1570

if self.expires <= now:

1571

# The timeout has passed

1572

self.disable()

1573

else:

1574

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

1575

is None):

1576

return

1577

gobject.source_remove(self.disable_initiator_tag)

1578

self.disable_initiator_tag = (

1579

gobject.timeout_add(

1580

timedelta_to_milliseconds(self.expires - now),

1581

self.disable))

1095

1582

1096

1583

# ExtendedTimeout - property

1097

1584

@dbus_service_property(_interface, signature="t",

1110

1597

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

1111

1598

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

1112

1599

return

1113

# Reschedule checker run

1114

gobject.source_remove(self.checker_initiator_tag)

1115

self.checker_initiator_tag = (gobject.timeout_add

1116

(value, self.start_checker))

1117

self.start_checker() # Start one now, too

1600

if self.enabled:

1601

# Reschedule checker run

1602

gobject.source_remove(self.checker_initiator_tag)

1603

self.checker_initiator_tag = (gobject.timeout_add

1604

(value, self.start_checker))

1605

self.start_checker() # Start one now, too

1118

1606

1119

1607

# Checker - property

1120

1608

@dbus_service_property(_interface, signature="s",

1122

1610

def Checker_dbus_property(self, value=None):

1123

1611

if value is None: # get

1124

1612

return dbus.String(self.checker_command)

1125

self.checker_command = value

1613

self.checker_command = unicode(value)

1126

1614

1127

1615

# CheckerRunning - property

1128

1616

@dbus_service_property(_interface, signature="b",

1157

1645

raise KeyError()

1158

1646

1159

1647

def __getattribute__(self, name):

1160

if(name == '_pipe'):

1648

if name == '_pipe':

1161

1649

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

1162

1650

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

1163

1651

data = self._pipe.recv()

1170

1658

return func

1171

1659

1172

1660

def __setattr__(self, name, value):

1173

if(name == '_pipe'):

1661

if name == '_pipe':

1174

1662

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

1175

1663

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

1176

1664

1216

1704

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

1217

1705

try:

1218

1706

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

1219

raise RuntimeError

1707

raise RuntimeError(line)

1220

1708

except (ValueError, IndexError, RuntimeError) as error:

1221

1709

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

1222

1710

return

1259

1747

client.name)

1260

1748

if self.server.use_dbus:

1261

1749

# Emit D-Bus signal

1262

client.Rejected("Disabled")

1750

client.Rejected("Disabled")

1263

1751

return

1264

1752

1265

if client._approved or not client.approval_delay:

1753

if client.approved or not client.approval_delay:

1266

1754

#We are approved or approval is disabled

1267

1755

break

1268

elif client._approved is None:

1756

elif client.approved is None:

1269

1757

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

1270

1758

client.name)

1271

1759

if self.server.use_dbus:

1282

1770

return

1283

1771

1284

1772

#wait until timeout or approved

1285

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

1286

1773

time = datetime.datetime.now()

1287

1774

client.changedstate.acquire()

1288

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

1775

client.changedstate.wait(

1776

float(timedelta_to_milliseconds(delay)

1777

/ 1000))

1289

1778

client.changedstate.release()

1290

1779

time2 = datetime.datetime.now()

1291

1780

if (time2 - time) >= delay:

1307

1796

try:

1308

1797

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

1309

1798

except gnutls.errors.GNUTLSError as error:

1310

logger.warning("gnutls send failed")

1799

logger.warning("gnutls send failed",

1800

exc_info=error)

1311

1801

return

1312

1802

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

1313

1803

sent, len(client.secret)

1315

1805

sent_size += sent

1316

1806

1317

1807

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

1318

# bump the timeout as if seen

1319

client.checked_ok(client.extended_timeout)

1808

# bump the timeout using extended_timeout

1809

client.bump_timeout(client.extended_timeout)

1320

1810

if self.server.use_dbus:

1321

1811

# Emit D-Bus signal

1322

1812

client.GotSecret()

1327

1817

try:

1328

1818

session.bye()

1329

1819

except gnutls.errors.GNUTLSError as error:

1330

logger.warning("GnuTLS bye failed")

1820

logger.warning("GnuTLS bye failed",

1821

exc_info=error)

1331

1822

1332

1823

@staticmethod

1333

1824

def peer_certificate(session):

1389

1880

# Convert the buffer to a Python bytestring

1390

1881

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

1391

1882

# Convert the bytestring to hexadecimal notation

1392

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

1883

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

1393

1884

return hex_fpr

1394

1885

1395

1886

1398

1889

def sub_process_main(self, request, address):

1399

1890

try:

1400

1891

self.finish_request(request, address)

1401

except:

1892

except Exception:

1402

1893

self.handle_error(request, address)

1403

1894

self.close_request(request)

1404

1895

1405

1896

def process_request(self, request, address):

1406

1897

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

1407

multiprocessing.Process(target = self.sub_process_main,

1408

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

1898

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

1899

args = (request, address))

1900

proc.start()

1901

return proc

1409

1902

1410

1903

1411

1904

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1417

1910

"""

1418

1911

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1419

1912

1420

super(MultiprocessingMixInWithPipe,

1421

self).process_request(request, client_address)

1913

proc = MultiprocessingMixIn.process_request(self, request,

1914

client_address)

1422

1915

self.child_pipe.close()

1423

self.add_pipe(parent_pipe)

1916

self.add_pipe(parent_pipe, proc)

1424

1917

1425

def add_pipe(self, parent_pipe):

1918

def add_pipe(self, parent_pipe, proc):

1426

1919

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

1427

raise NotImplementedError

1920

raise NotImplementedError()

1428

1921

1429

1922

1430

1923

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1437

1930

use_ipv6: Boolean; to use IPv6 or not

1438

1931

"""

1439

1932

def __init__(self, server_address, RequestHandlerClass,

1440

interface=None, use_ipv6=True):

1933

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

1934

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

1935

creating a new one with socket.socket().

1936

"""

1441

1937

self.interface = interface

1442

1938

if use_ipv6:

1443

1939

self.address_family = socket.AF_INET6

1940

if socketfd is not None:

1941

# Save the file descriptor

1942

self.socketfd = socketfd

1943

# Save the original socket.socket() function

1944

self.socket_socket = socket.socket

1945

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

1946

#

1947

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

1948

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

1949

# patching socket.socket.)

1950

#

1951

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

1952

@functools.wraps(socket.socket)

1953

def socket_wrapper(*args, **kwargs):

1954

# Restore original function so subsequent calls are

1955

# not affected.

1956

socket.socket = self.socket_socket

1957

del self.socket_socket

1958

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

1959

# saved file descriptor.

1960

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

1961

# Replace socket.socket() function with wrapper

1962

socket.socket = socket_wrapper

1963

# The socketserver.TCPServer.__init__ will call

1964

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

1965

# socket_wrapper(), if socketfd was set.

1444

1966

socketserver.TCPServer.__init__(self, server_address,

1445

1967

RequestHandlerClass)

1968

1446

1969

def server_bind(self):

1447

1970

"""This overrides the normal server_bind() function

1448

1971

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

1456

1979

try:

1457

1980

self.socket.setsockopt(socket.SOL_SOCKET,

1458

1981

SO_BINDTODEVICE,

1459

str(self.interface

1460

+ '\0'))

1982

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

1461

1983

except socket.error as error:

1462

if error[0] == errno.EPERM:

1463

logger.error("No permission to"

1464

" bind to interface %s",

1465

self.interface)

1466

elif error[0] == errno.ENOPROTOOPT:

1984

if error.errno == errno.EPERM:

1985

logger.error("No permission to bind to"

1986

" interface %s", self.interface)

1987

elif error.errno == errno.ENOPROTOOPT:

1467

1988

logger.error("SO_BINDTODEVICE not available;"

1468

1989

" cannot bind to interface %s",

1469

1990

self.interface)

1991

elif error.errno == errno.ENODEV:

1992

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

1993

" cannot bind", self.interface)

1470

1994

else:

1471

1995

raise

1472

1996

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

1475

1999

if self.address_family == socket.AF_INET6:

1476

2000

any_address = "::" # in6addr_any

1477

2001

else:

1478

any_address = socket.INADDR_ANY

2002

any_address = "0.0.0.0" # INADDR_ANY

1479

2003

self.server_address = (any_address,

1480

2004

self.server_address[1])

1481

2005

elif not self.server_address[1]:

1502

2026

"""

1503

2027

def __init__(self, server_address, RequestHandlerClass,

1504

2028

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

1505

gnutls_priority=None, use_dbus=True):

2029

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

1506

2030

self.enabled = False

1507

2031

self.clients = clients

1508

2032

if self.clients is None:

1509

self.clients = set()

2033

self.clients = {}

1510

2034

self.use_dbus = use_dbus

1511

2035

self.gnutls_priority = gnutls_priority

1512

2036

IPv6_TCPServer.__init__(self, server_address,

1513

2037

RequestHandlerClass,

1514

2038

interface = interface,

1515

use_ipv6 = use_ipv6)

2039

use_ipv6 = use_ipv6,

2040

socketfd = socketfd)

1516

2041

def server_activate(self):

1517

2042

if self.enabled:

1518

2043

return socketserver.TCPServer.server_activate(self)

2044

1519

2045

def enable(self):

1520

2046

self.enabled = True

1521

def add_pipe(self, parent_pipe):

2047

2048

def add_pipe(self, parent_pipe, proc):

1522

2049

# Call "handle_ipc" for both data and EOF events

1523

2050

gobject.io_add_watch(parent_pipe.fileno(),

1524

2051

gobject.IO_IN | gobject.IO_HUP,

1525

2052

functools.partial(self.handle_ipc,

1526

parent_pipe = parent_pipe))

1527

2053

parent_pipe =

2054

parent_pipe,

2055

proc = proc))

2056

1528

2057

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

1529

client_object=None):

1530

condition_names = {

1531

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

1532

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

1533

# blocking).

1534

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

1535

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

1536

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

1537

# broken, usually for pipes and

1538

# sockets).

1539

}

1540

conditions_string = ' | '.join(name

1541

for cond, name in

1542

condition_names.iteritems()

1543

if cond & condition)

1544

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

1545

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

2058

proc = None, client_object=None):

2059

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

2060

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

2061

# Wait for other process to exit

2062

proc.join()

1546

2063

return False

1547

2064

1548

2065

# Read a request from the child

1553

2070

fpr = request[1]

1554

2071

address = request[2]

1555

2072

1556

for c in self.clients:

2073

for c in self.clients.itervalues():

1557

2074

if c.fingerprint == fpr:

1558

2075

client = c

1559

2076

break

1562

2079

"dress: %s", fpr, address)

1563

2080

if self.use_dbus:

1564

2081

# Emit D-Bus signal

1565

mandos_dbus_service.ClientNotFound(fpr, address[0])

2082

mandos_dbus_service.ClientNotFound(fpr,

2083

address[0])

1566

2084

parent_pipe.send(False)

1567

2085

return False

1568

2086

1569

2087

gobject.io_add_watch(parent_pipe.fileno(),

1570

2088

gobject.IO_IN | gobject.IO_HUP,

1571

2089

functools.partial(self.handle_ipc,

1572

parent_pipe = parent_pipe,

1573

client_object = client))

2090

parent_pipe =

2091

parent_pipe,

2092

proc = proc,

2093

client_object =

2094

client))

1574

2095

parent_pipe.send(True)

1575

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

2096

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

2097

# same fileno

1576

2098

return False

1577

2099

if command == 'funcall':

1578

2100

funcname = request[1]

1579

2101

args = request[2]

1580

2102

kwargs = request[3]

1581

2103

1582

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

2104

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

2105

funcname)(*args,

2106

**kwargs)))

1583

2107

1584

2108

if command == 'getattr':

1585

2109

attrname = request[1]

1586

2110

if callable(client_object.__getattribute__(attrname)):

1587

2111

parent_pipe.send(('function',))

1588

2112

else:

1589

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

2113

parent_pipe.send(('data', client_object

2114

.__getattribute__(attrname)))

1590

2115

1591

2116

if command == 'setattr':

1592

2117

attrname = request[1]

1596

2121

return True

1597

2122

1598

2123

2124

def rfc3339_duration_to_delta(duration):

2125

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

2126

2127

>>> rfc3339_duration_to_delta("P7D")

2128

datetime.timedelta(7)

2129

>>> rfc3339_duration_to_delta("PT60S")

2130

datetime.timedelta(0, 60)

2131

>>> rfc3339_duration_to_delta("PT60M")

2132

datetime.timedelta(0, 3600)

2133

>>> rfc3339_duration_to_delta("PT24H")

2134

datetime.timedelta(1)

2135

>>> rfc3339_duration_to_delta("P1W")

2136

datetime.timedelta(7)

2137

>>> rfc3339_duration_to_delta("PT5M30S")

2138

datetime.timedelta(0, 330)

2139

>>> rfc3339_duration_to_delta("P1DT3M20S")

2140

datetime.timedelta(1, 200)

2141

"""

2142

2143

# Parsing an RFC 3339 duration with regular expressions is not

2144

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

2145

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

2146

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

2147

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

2148

# avoid excessive use of external libraries.

2149

2150

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

2151

Token = collections.namedtuple("Token",

2152

("regexp", # To match token; if

2153

# "value" is not None,

2154

# must have a "group"

2155

# containing digits

2156

"value", # datetime.timedelta or

2157

# None

2158

"followers")) # Tokens valid after

2159

# this token

2160

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

2161

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

2162

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

2163

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

2164

datetime.timedelta(seconds=1),

2165

frozenset((token_end,)))

2166

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

2167

datetime.timedelta(minutes=1),

2168

frozenset((token_second, token_end)))

2169

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

2170

datetime.timedelta(hours=1),

2171

frozenset((token_minute, token_end)))

2172

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

2173

None,

2174

frozenset((token_hour, token_minute,

2175

token_second)))

2176

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

2177

datetime.timedelta(days=1),

2178

frozenset((token_time, token_end)))

2179

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

2180

datetime.timedelta(weeks=4),

2181

frozenset((token_day, token_end)))

2182

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

2183

datetime.timedelta(weeks=52),

2184

frozenset((token_month, token_end)))

2185

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

2186

datetime.timedelta(weeks=1),

2187

frozenset((token_end,)))

2188

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

2189

frozenset((token_year, token_month,

2190

token_day, token_time,

2191

token_week))),

2192

# Define starting values

2193

value = datetime.timedelta() # Value so far

2194

found_token = None

2195

followers = frozenset(token_duration,) # Following valid tokens

2196

s = duration # String left to parse

2197

# Loop until end token is found

2198

while found_token is not token_end:

2199

# Search for any currently valid tokens

2200

for token in followers:

2201

match = token.regexp.match(s)

2202

if match is not None:

2203

# Token found

2204

if token.value is not None:

2205

# Value found, parse digits

2206

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

2207

# Add to value so far

2208

value += factor * token.value

2209

# Strip token from string

2210

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

2211

# Go to found token

2212

found_token = token

2213

# Set valid next tokens

2214

followers = found_token.followers

2215

break

2216

else:

2217

# No currently valid tokens were found

2218

raise ValueError("Invalid RFC 3339 duration")

2219

# End token found

2220

return value

2221

2222

1599

2223

def string_to_delta(interval):

1600

2224

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

1601

2225

1612

2236

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

1613

2237

datetime.timedelta(0, 330)

1614

2238

"""

2239

2240

try:

2241

return rfc3339_duration_to_delta(interval)

2242

except ValueError:

2243

pass

2244

1615

2245

timevalue = datetime.timedelta(0)

1616

2246

for s in interval.split():

1617

2247

try:

1628

2258

elif suffix == "w":

1629

2259

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

1630

2260

else:

1631

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

1632

except (ValueError, IndexError) as e:

2261

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

2262

.format(suffix))

2263

except IndexError as e:

1633

2264

raise ValueError(*(e.args))

1634

2265

timevalue += delta

1635

2266

return timevalue

1636

2267

1637

2268

1638

def if_nametoindex(interface):

1639

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

1640

1641

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

1642

global if_nametoindex

1643

try:

1644

if_nametoindex = (ctypes.cdll.LoadLibrary

1645

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

1646

.if_nametoindex)

1647

except (OSError, AttributeError):

1648

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

1649

def if_nametoindex(interface):

1650

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

1651

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

1652

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

1653

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1654

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

1655

interface))

1656

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

1657

ifreq[16:20])[0]

1658

return interface_index

1659

return if_nametoindex(interface)

1660

1661

1662

2269

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

1663

2270

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

1664

2271

1672

2279

sys.exit()

1673

2280

if not noclose:

1674

2281

# Close all standard open file descriptors

1675

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

2282

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

1676

2283

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

1677

2284

raise OSError(errno.ENODEV,

1678

"%s not a character device"

1679

% os.path.devnull)

2285

"{0} not a character device"

2286

.format(os.devnull))

1680

2287

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

1681

2288

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

1682

2289

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

1691

2298

1692

2299

parser = argparse.ArgumentParser()

1693

2300

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

1694

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

2301

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

1695

2302

help="show version number and exit")

1696

2303

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

1697

2304

help="Bind to interface IF")

1703

2310

help="Run self-test")

1704

2311

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

1705

2312

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

1706

" to terminal")

2313

" to terminal", default=None)

1707

2314

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

1708

2315

help="Debug level for stdout output")

1709

2316

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

1716

2323

" files")

1717

2324

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

1718

2325

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

1719

" system bus interface")

2326

" system bus interface", default=None)

1720

2327

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

1721

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

2328

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

2329

default=None)

2330

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

2331

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

2332

" state", default=None)

2333

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

2334

help="Specify a file descriptor to a network"

2335

" socket to use instead of creating one")

2336

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

2337

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

2338

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

2339

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

2340

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

2341

dest="zeroconf", help="Do not use Zeroconf",

2342

default=None)

2343

1722

2344

options = parser.parse_args()

1723

2345

1724

2346

if options.check:

1725

2347

import doctest

1726

doctest.testmod()

1727

sys.exit()

2348

fail_count, test_count = doctest.testmod()

2349

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

1728

2350

1729

2351

# Default values for config file for server-global settings

1730

2352

server_defaults = { "interface": "",

1732

2354

"port": "",

1733

2355

"debug": "False",

1734

2356

"priority":

1735

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

2357

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

1736

2358

"servicename": "Mandos",

1737

2359

"use_dbus": "True",

1738

2360

"use_ipv6": "True",

1739

2361

"debuglevel": "",

2362

"restore": "True",

2363

"socket": "",

2364

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

2365

"foreground": "False",

2366

"zeroconf": "True",

1740

2367

}

1741

2368

1742

2369

# Parse config file for server-global settings

1747

2374

# Convert the SafeConfigParser object to a dict

1748

2375

server_settings = server_config.defaults()

1749

2376

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

1750

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

2377

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

1751

2378

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

1752

2379

option)

1753

2380

if server_settings["port"]:

1754

2381

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

1755

2382

"port")

2383

if server_settings["socket"]:

2384

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

2385

"socket")

2386

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

2387

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

2388

# happen with a supplied network socket.

2389

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

2390

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

2391

["socket"])

1756

2392

del server_config

1757

2393

1758

2394

# Override the settings from the config file with command line

1759

2395

# options, if set.

1760

2396

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

1761

2397

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

1762

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

2398

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

2399

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

1763

2400

value = getattr(options, option)

1764

2401

if value is not None:

1765

2402

server_settings[option] = value

1768

2405

for option in server_settings.keys():

1769

2406

if type(server_settings[option]) is str:

1770

2407

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

2408

# Force all boolean options to be boolean

2409

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

2410

"foreground", "zeroconf"):

2411

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

2412

# Debug implies foreground

2413

if server_settings["debug"]:

2414

server_settings["foreground"] = True

1771

2415

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

1772

2416

1773

2417

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

1774

2418

2419

if (not server_settings["zeroconf"] and

2420

not (server_settings["port"]

2421

or server_settings["socket"] != "")):

2422

parser.error("Needs port or socket to work without"

2423

" Zeroconf")

2424

1775

2425

# For convenience

1776

2426

debug = server_settings["debug"]

1777

2427

debuglevel = server_settings["debuglevel"]

1778

2428

use_dbus = server_settings["use_dbus"]

1779

2429

use_ipv6 = server_settings["use_ipv6"]

2430

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

2431

stored_state_file)

2432

foreground = server_settings["foreground"]

2433

zeroconf = server_settings["zeroconf"]

2434

2435

if debug:

2436

initlogger(debug, logging.DEBUG)

2437

else:

2438

if not debuglevel:

2439

initlogger(debug)

2440

else:

2441

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

2442

initlogger(debug, level)

1780

2443

1781

2444

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

1782

2445

syslogger.setFormatter(logging.Formatter

1783

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

1784

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

1785

% server_settings["servicename"]))

2446

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

2447

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

2448

.format(server_settings

2449

["servicename"])))

1786

2450

1787

2451

# Parse config file with clients

1788

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

1789

"extended_timeout": "15m",

1790

"interval": "2m",

1791

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

1792

"host": "",

1793

"approval_delay": "0s",

1794

"approval_duration": "1s",

1795

}

1796

client_config = configparser.SafeConfigParser(client_defaults)

2452

client_config = configparser.SafeConfigParser(Client

2453

.client_defaults)

1797

2454

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

1798

2455

"clients.conf"))

1799

2456

1800

2457

global mandos_dbus_service

1801

2458

mandos_dbus_service = None

1802

2459

2460

socketfd = None

2461

if server_settings["socket"] != "":

2462

socketfd = server_settings["socket"]

1803

2463

tcp_server = MandosServer((server_settings["address"],

1804

2464

server_settings["port"]),

1805

2465

ClientHandler,

1808

2468

use_ipv6=use_ipv6,

1809

2469

gnutls_priority=

1810

2470

server_settings["priority"],

1811

use_dbus=use_dbus)

1812

if not debug:

1813

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

2471

use_dbus=use_dbus,

2472

socketfd=socketfd)

2473

if not foreground:

2474

pidfilename = "/run/mandos.pid"

2475

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

2476

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

2477

pidfile = None

1814

2478

try:

1815

2479

pidfile = open(pidfilename, "w")

1816

except IOError:

1817

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

2480

except IOError as e:

2481

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

2482

exc_info=e)

1818

2483

1819

try:

1820

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

1821

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

1822

except KeyError:

2484

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

1823

2485

try:

1824

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

1825

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

2486

uid = pwd.getpwnam(name).pw_uid

2487

gid = pwd.getpwnam(name).pw_gid

2488

break

1826

2489

except KeyError:

1827

try:

1828

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

1829

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

1830

except KeyError:

1831

uid = 65534

1832

gid = 65534

2490

continue

2491

else:

2492

uid = 65534

2493

gid = 65534

1833

2494

try:

1834

2495

os.setgid(gid)

1835

2496

os.setuid(uid)

1836

2497

except OSError as error:

1837

if error[0] != errno.EPERM:

1838

raise error

1839

1840

if not debug and not debuglevel:

1841

syslogger.setLevel(logging.WARNING)

1842

console.setLevel(logging.WARNING)

1843

if debuglevel:

1844

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

1845

syslogger.setLevel(level)

1846

console.setLevel(level)

2498

if error.errno != errno.EPERM:

2499

raise

1847

2500

1848

2501

if debug:

1849

2502

# Enable all possible GnuTLS debugging

1860

2513

.gnutls_global_set_log_function(debug_gnutls))

1861

2514

1862

2515

# Redirect stdin so all checkers get /dev/null

1863

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

2516

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

1864

2517

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

1865

2518

if null > 2:

1866

2519

os.close(null)

1867

else:

1868

# No console logging

1869

logger.removeHandler(console)

1870

2520

1871

2521

# Need to fork before connecting to D-Bus

1872

if not debug:

2522

if not foreground:

1873

2523

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

1874

2524

daemon()

1875

2525

2526

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

2527

# need to inform gobject that threads will be used.

2528

gobject.threads_init()

2529

1876

2530

global main_loop

1877

2531

# From the Avahi example code

1878

DBusGMainLoop(set_as_default=True )

2532

DBusGMainLoop(set_as_default=True)

1879

2533

main_loop = gobject.MainLoop()

1880

2534

bus = dbus.SystemBus()

1881

2535

# End of Avahi example code

1882

2536

if use_dbus:

1883

2537

try:

1884

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

2538

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

1885

2539

bus, do_not_queue=True)

2540

old_bus_name = (dbus.service.BusName

2541

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

2542

do_not_queue=True))

1886

2543

except dbus.exceptions.NameExistsException as e:

1887

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

2544

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

1888

2545

use_dbus = False

1889

2546

server_settings["use_dbus"] = False

1890

2547

tcp_server.use_dbus = False

1891

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1892

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

1893

servicetype = "_mandos._tcp",

1894

protocol = protocol, bus = bus)

1895

if server_settings["interface"]:

1896

service.interface = (if_nametoindex

1897

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

2548

if zeroconf:

2549

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2550

service = AvahiServiceToSyslog(name =

2551

server_settings["servicename"],

2552

servicetype = "_mandos._tcp",

2553

protocol = protocol, bus = bus)

2554

if server_settings["interface"]:

2555

service.interface = (if_nametoindex

2556

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

1898

2557

1899

2558

global multiprocessing_manager

1900

2559

multiprocessing_manager = multiprocessing.Manager()

1902

2561

client_class = Client

1903

2562

if use_dbus:

1904

2563

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

1905

def client_config_items(config, section):

1906

special_settings = {

1907

"approved_by_default":

1908

lambda: config.getboolean(section,

1909

"approved_by_default"),

1910

}

1911

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

2564

2565

client_settings = Client.config_parser(client_config)

2566

old_client_settings = {}

2567

clients_data = {}

2568

2569

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

2570

global wnull

2571

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

2572

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

2573

# mode

2574

if debug or not foreground:

2575

wnull.close()

2576

2577

# Get client data and settings from last running state.

2578

if server_settings["restore"]:

2579

try:

2580

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

2581

clients_data, old_client_settings = (pickle.load

2582

(stored_state))

2583

os.remove(stored_state_path)

2584

except IOError as e:

2585

if e.errno == errno.ENOENT:

2586

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

2587

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

2588

else:

2589

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

2590

exc_info=e)

2591

raise

2592

except EOFError as e:

2593

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

2594

"EOFError:", exc_info=e)

2595

2596

with PGPEngine() as pgp:

2597

for client_name, client in clients_data.iteritems():

2598

# Skip removed clients

2599

if client_name not in client_settings:

2600

continue

2601

2602

# Decide which value to use after restoring saved state.

2603

# We have three different values: Old config file,

2604

# new config file, and saved state.

2605

# New config value takes precedence if it differs from old

2606

# config value, otherwise use saved state.

2607

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

2608

try:

2609

# For each value in new config, check if it

2610

# differs from the old config value (Except for

2611

# the "secret" attribute)

2612

if (name != "secret" and

2613

value != old_client_settings[client_name]

2614

[name]):

2615

client[name] = value

2616

except KeyError:

2617

pass

2618

2619

# Clients who has passed its expire date can still be

2620

# enabled if its last checker was successful. Clients

2621

# whose checker succeeded before we stored its state is

2622

# assumed to have successfully run all checkers during

2623

# downtime.

2624

if client["enabled"]:

2625

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

2626

if not client["last_checked_ok"]:

2627

logger.warning(

2628

"disabling client {0} - Client never "

2629

"performed a successful checker"

2630

.format(client_name))

2631

client["enabled"] = False

2632

elif client["last_checker_status"] != 0:

2633

logger.warning(

2634

"disabling client {0} - Client "

2635

"last checker failed with error code {1}"

2636

.format(client_name,

2637

client["last_checker_status"]))

2638

client["enabled"] = False

2639

else:

2640

client["expires"] = (datetime.datetime

2641

.utcnow()

2642

+ client["timeout"])

2643

logger.debug("Last checker succeeded,"

2644

" keeping {0} enabled"

2645

.format(client_name))

1912

2646

try:

1913

yield (name, special_settings[name]())

1914

except KeyError:

1915

yield (name, value)

1916

1917

tcp_server.clients.update(set(

1918

client_class(name = section,

1919

config= dict(client_config_items(

1920

client_config, section)))

1921

for section in client_config.sections()))

2647

client["secret"] = (

2648

pgp.decrypt(client["encrypted_secret"],

2649

client_settings[client_name]

2650

["secret"]))

2651

except PGPError:

2652

# If decryption fails, we use secret from new settings

2653

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

2654

.format(client_name))

2655

client["secret"] = (

2656

client_settings[client_name]["secret"])

2657

2658

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

2659

for client_name in (set(old_client_settings)

2660

- set(client_settings)):

2661

del clients_data[client_name]

2662

for client_name in (set(client_settings)

2663

- set(old_client_settings)):

2664

clients_data[client_name] = client_settings[client_name]

2665

2666

# Create all client objects

2667

for client_name, client in clients_data.iteritems():

2668

tcp_server.clients[client_name] = client_class(

2669

name = client_name, settings = client,

2670

server_settings = server_settings)

2671

1922

2672

if not tcp_server.clients:

1923

2673

logger.warning("No clients defined")

1924

1925

if not debug:

1926

try:

1927

with pidfile:

1928

pid = os.getpid()

1929

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

1930

del pidfile

1931

except IOError:

1932

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

1933

pidfilename, pid)

1934

except NameError:

1935

# "pidfile" was never created

1936

pass

2674

2675

if not foreground:

2676

if pidfile is not None:

2677

try:

2678

with pidfile:

2679

pid = os.getpid()

2680

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

2681

except IOError:

2682

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

2683

pidfilename, pid)

2684

del pidfile

1937

2685

del pidfilename

1938

1939

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

1940

2686

1941

2687

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

1942

2688

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

1943

2689

1944

2690

if use_dbus:

1945

class MandosDBusService(dbus.service.Object):

2691

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

2692

"se.bsnet.fukt.Mandos"})

2693

class MandosDBusService(DBusObjectWithProperties):

1946

2694

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

1947

2695

def __init__(self):

1948

2696

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

1949

_interface = "se.bsnet.fukt.Mandos"

2697

_interface = "se.recompile.Mandos"

2698

2699

@dbus_interface_annotations(_interface)

2700

def _foo(self):

2701

return { "org.freedesktop.DBus.Property"

2702

".EmitsChangedSignal":

2703

"false"}

1950

2704

1951

2705

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

1952

2706

def ClientAdded(self, objpath):

1967

2721

def GetAllClients(self):

1968

2722

"D-Bus method"

1969

2723

return dbus.Array(c.dbus_object_path

1970

for c in tcp_server.clients)

2724

for c in

2725

tcp_server.clients.itervalues())

1971

2726

1972

2727

@dbus.service.method(_interface,

1973

2728

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

1975

2730

"D-Bus method"

1976

2731

return dbus.Dictionary(

1977

2732

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

1978

for c in tcp_server.clients),

2733

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

1979

2734

signature="oa{sv}")

1980

2735

1981

2736

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

1982

2737

def RemoveClient(self, object_path):

1983

2738

"D-Bus method"

1984

for c in tcp_server.clients:

2739

for c in tcp_server.clients.itervalues():

1985

2740

if c.dbus_object_path == object_path:

1986

tcp_server.clients.remove(c)

2741

del tcp_server.clients[c.name]

1987

2742

c.remove_from_connection()

1988

2743

# Don't signal anything except ClientRemoved

1989

2744

c.disable(quiet=True)

1998

2753

1999

2754

def cleanup():

2000

2755

"Cleanup function; run on exit"

2001

service.cleanup()

2002

2756

if zeroconf:

2757

service.cleanup()

2758

2759

multiprocessing.active_children()

2760

wnull.close()

2761

if not (tcp_server.clients or client_settings):

2762

return

2763

2764

# Store client before exiting. Secrets are encrypted with key

2765

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

2766

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

2767

clients = {}

2768

with PGPEngine() as pgp:

2769

for client in tcp_server.clients.itervalues():

2770

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

2771

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

2772

key)

2773

client_dict = {}

2774

2775

# A list of attributes that can not be pickled

2776

# + secret.

2777

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

2778

"checker", "server_settings"))

2779

for name, typ in (inspect.getmembers

2780

(dbus.service.Object)):

2781

exclude.add(name)

2782

2783

client_dict["encrypted_secret"] = (client

2784

.encrypted_secret)

2785

for attr in client.client_structure:

2786

if attr not in exclude:

2787

client_dict[attr] = getattr(client, attr)

2788

2789

clients[client.name] = client_dict

2790

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

2791

2792

try:

2793

with (tempfile.NamedTemporaryFile

2794

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

2795

dir=os.path.dirname(stored_state_path),

2796

delete=False)) as stored_state:

2797

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

2798

tempname=stored_state.name

2799

os.rename(tempname, stored_state_path)

2800

except (IOError, OSError) as e:

2801

if not debug:

2802

try:

2803

os.remove(tempname)

2804

except NameError:

2805

pass

2806

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

2807

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

2808

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

2809

else:

2810

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

2811

exc_info=e)

2812

raise

2813

2814

# Delete all clients, and settings from config

2003

2815

while tcp_server.clients:

2004

client = tcp_server.clients.pop()

2816

name, client = tcp_server.clients.popitem()

2005

2817

if use_dbus:

2006

2818

client.remove_from_connection()

2007

client.disable_hook = None

2008

2819

# Don't signal anything except ClientRemoved

2009

2820

client.disable(quiet=True)

2010

2821

if use_dbus:

2011

2822

# Emit D-Bus signal

2012

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2823

mandos_dbus_service.ClientRemoved(client

2824

.dbus_object_path,

2013

2825

client.name)

2826

client_settings.clear()

2014

2827

2015

2828

atexit.register(cleanup)

2016

2829

2017

for client in tcp_server.clients:

2830

for client in tcp_server.clients.itervalues():

2018

2831

if use_dbus:

2019

2832

# Emit D-Bus signal

2020

2833

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2021

client.enable()

2834

# Need to initiate checking of clients

2835

if client.enabled:

2836

client.init_checker()

2022

2837

2023

2838

tcp_server.enable()

2024

2839

tcp_server.server_activate()

2025

2840

2026

2841

# Find out what port we got

2027

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

2842

if zeroconf:

2843

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

2028

2844

if use_ipv6:

2029

2845

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

2030

" flowinfo %d, scope_id %d"

2031

% tcp_server.socket.getsockname())

2846

" flowinfo %d, scope_id %d",

2847

*tcp_server.socket.getsockname())

2032

2848

else: # IPv4

2033

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

2034

% tcp_server.socket.getsockname())

2849

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

2850

*tcp_server.socket.getsockname())

2035

2851

2036

2852

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

2037

2853

2038

2854

try:

2039

# From the Avahi example code

2040

try:

2041

service.activate()

2042

except dbus.exceptions.DBusException as error:

2043

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

2044

cleanup()

2045

sys.exit(1)

2046

# End of Avahi example code

2855

if zeroconf:

2856

# From the Avahi example code

2857

try:

2858

service.activate()

2859

except dbus.exceptions.DBusException as error:

2860

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

2861

cleanup()

2862

sys.exit(1)

2863

# End of Avahi example code

2047

2864

2048

2865

gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,

2049

2866

lambda *args, **kwargs:

2053

2870

logger.debug("Starting main loop")

2054

2871

main_loop.run()

2055

2872

except AvahiError as error:

2056

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

2873

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

2057

2874

cleanup()

2058

2875

sys.exit(1)

2059

2876

except KeyboardInterrupt:

2064

2881

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

2065

2882

cleanup()

2066

2883

2067

2068

2884

if __name__ == '__main__':

2069

2885

main()