/mandos/trunk : revision 505.3.10

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#!/usr/bin/python2.7

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#!/usr/bin/python

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# -*- mode: python; coding: utf-8 -*-

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#

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# Mandos server - give out binary blobs to connecting clients.

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import dbus

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import dbus.service

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except ImportError:

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.6.9"

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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(b"16s16x", interface))

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interface_index = struct.unpack("I", 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 = "/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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version = "1.4.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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self.value = value

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return super(AvahiError, self).__init__(value, *args,

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**kwargs)

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super(AvahiError, self).__init__(value, *args, **kwargs)

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self, remove=True):

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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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logger.critical("No suitable Zeroconf service name found"

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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 = str(self.server

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.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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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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if remove:

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self.remove()

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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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if (error.get_dbus_name()

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== "org.freedesktop.Avahi.CollisionError"):

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logger.info("Local Zeroconf service name collision.")

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return self.rename(remove=False)

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else:

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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self.rename()

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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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str(error))

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

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.format(error))

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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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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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

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class AvahiServiceToSyslog(AvahiService):

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

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

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ret = AvahiService.rename(self, *args, **kwargs)

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syslogger.setFormatter(logging.Formatter

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('Mandos ({}) [%(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_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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@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 {}"

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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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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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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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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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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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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.items():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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if config is None:

340

config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

345

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

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.replace(" ", ""))

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

348

if "secret" in config:

349

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

350

elif "secfile" in config:

351

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

352

(config["secfile"])),

353

"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

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

359

self.created = datetime.datetime.utcnow()

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self.enabled = False

361

self.last_approval_request = None

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self.last_enabled = None

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self.last_checked_ok = None

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

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self.extended_timeout = string_to_delta(config

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["extended_timeout"])

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

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self.disable_hook = disable_hook

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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self.expires = None

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

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self.current_checker_command = None

550

self.approved = None

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self.last_connect = None

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self._approved = None

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

379

True)

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self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

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386

.Condition(multiprocessing_manager

554

387

.Lock()))

555

self.client_structure = [attr for attr in

556

self.__dict__.iterkeys()

557

if not attr.startswith("_")]

558

self.client_structure.append("client_structure")

559

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

561

lambda obj:

562

isinstance(obj,

563

property)):

564

if not name.startswith("_"):

565

self.client_structure.append(name)

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# Send notice to process children that client state has changed

568

389

def send_changedstate(self):

569

with self.changedstate:

570

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

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def enable(self):

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

574

396

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

575

397

# Already enabled

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return

399

self.send_changedstate()

400

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

401

# and every interval from then on.

402

self.checker_initiator_tag = (gobject.timeout_add

403

(self.interval_milliseconds(),

404

self.start_checker))

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

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

407

self.disable_initiator_tag = (gobject.timeout_add

408

(self.timeout_milliseconds(),

409

self.disable))

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

580

self.init_checker()

581

self.send_changedstate()

412

# Also start a new checker *right now*.

413

self.start_checker()

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414

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415

def disable(self, quiet=True):

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416

"""Disable this client."""

585

417

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

586

418

return False

587

419

if not quiet:

420

self.send_changedstate()

421

if not quiet:

588

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

589

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

423

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

590

424

gobject.source_remove(self.disable_initiator_tag)

591

425

self.disable_initiator_tag = None

592

426

self.expires = None

593

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

427

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

594

428

gobject.source_remove(self.checker_initiator_tag)

595

429

self.checker_initiator_tag = None

596

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

597

433

self.enabled = False

598

if not quiet:

599

self.send_changedstate()

600

434

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

601

435

return False

602

436

603

437

def __del__(self):

438

self.disable_hook = None

604

439

self.disable()

605

440

606

def init_checker(self):

607

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

608

# and every interval from then on.

609

if self.checker_initiator_tag is not None:

610

gobject.source_remove(self.checker_initiator_tag)

611

self.checker_initiator_tag = (gobject.timeout_add

612

(int(self.interval

613

.total_seconds() * 1000),

614

self.start_checker))

615

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

616

if self.disable_initiator_tag is not None:

617

gobject.source_remove(self.disable_initiator_tag)

618

self.disable_initiator_tag = (gobject.timeout_add

619

(int(self.timeout

620

.total_seconds() * 1000),

621

self.disable))

622

# Also start a new checker *right now*.

623

self.start_checker()

624

625

441

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

626

442

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

627

443

self.checker_callback_tag = None

628

444

self.checker = None

629

445

if os.WIFEXITED(condition):

630

self.last_checker_status = os.WEXITSTATUS(condition)

631

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

632

448

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

633

449

vars(self))

634

450

self.checked_ok()

636

452

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

637

453

vars(self))

638

454

else:

639

self.last_checker_status = -1

640

455

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

641

456

vars(self))

642

457

643

def checked_ok(self):

644

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

645

self.last_checked_ok = datetime.datetime.utcnow()

646

self.last_checker_status = 0

647

self.bump_timeout()

648

649

def bump_timeout(self, timeout=None):

650

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

458

def checked_ok(self, timeout=None):

459

"""Bump up the timeout for this client.

460

461

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

462

alive and well.

463

"""

651

464

if timeout is None:

652

465

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

653

467

if self.disable_initiator_tag is not None:

654

468

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

656

469

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

657

470

self.disable_initiator_tag = (gobject.timeout_add

658

(int(timeout.total_seconds()

659

* 1000), self.disable))

471

(_timedelta_to_milliseconds

472

(timeout), self.disable))

660

473

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

661

474

662

475

def need_approval(self):

668

481

If a checker already exists, leave it running and do

669

482

nothing."""

670

483

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

671

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

672

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

673

# would inevitably timeout, since no checker would get a

674

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

484

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

485

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

486

# client would inevitably timeout, since no checker would get

487

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

675

488

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

676

489

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

677

490

# should be.

679

492

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

680

493

try:

681

494

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

682

except AttributeError:

683

pass

684

except OSError as error:

685

if error.errno != errno.ECHILD:

686

raise

495

except (AttributeError, OSError) as error:

496

if (isinstance(error, OSError)

497

and error.errno != errno.ECHILD):

498

raise error

687

499

else:

688

500

if pid:

689

501

logger.warning("Checker was a zombie")

692

504

self.current_checker_command)

693

505

# Start a new checker if needed

694

506

if self.checker is None:

695

# Escape attributes for the shell

696

escaped_attrs = { attr:

697

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

698

for attr in self.runtime_expansions }

699

507

try:

700

command = self.checker_command % escaped_attrs

701

except TypeError as error:

702

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

703

self.checker_command, exc_info=error)

704

return True # Try again later

508

# In case checker_command has exactly one % operator

509

command = self.checker_command % self.host

510

except TypeError:

511

# Escape attributes for the shell

512

escaped_attrs = dict(

513

(attr,

514

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

515

errors=

516

'replace')))

517

for attr in

518

self.runtime_expansions)

519

520

try:

521

command = self.checker_command % escaped_attrs

522

except TypeError as error:

523

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

524

' %s', self.checker_command, error)

525

return True # Try again later

705

526

self.current_checker_command = command

706

527

try:

707

528

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

710

531

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

711

532

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

712

533

# always replaced by /dev/null.)

713

# The exception is when not debugging but nevertheless

714

# running in the foreground; use the previously

715

# created wnull.

716

popen_args = {}

717

if (not self.server_settings["debug"]

718

and self.server_settings["foreground"]):

719

popen_args.update({"stdout": wnull,

720

"stderr": wnull })

721

534

self.checker = subprocess.Popen(command,

722

535

close_fds=True,

723

shell=True, cwd="/",

724

**popen_args)

725

except OSError as error:

726

logger.error("Failed to start subprocess",

727

exc_info=error)

728

return True

729

self.checker_callback_tag = (gobject.child_watch_add

730

(self.checker.pid,

731

self.checker_callback,

732

data=command))

733

# The checker may have completed before the gobject

734

# watch was added. Check for this.

735

try:

536

shell=True, cwd="/")

537

self.checker_callback_tag = (gobject.child_watch_add

538

(self.checker.pid,

539

self.checker_callback,

540

data=command))

541

# The checker may have completed before the gobject

542

# watch was added. Check for this.

736

543

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

544

if pid:

545

gobject.source_remove(self.checker_callback_tag)

546

self.checker_callback(pid, status, command)

737

547

except OSError as error:

738

if error.errno == errno.ECHILD:

739

# This should never happen

740

logger.error("Child process vanished",

741

exc_info=error)

742

return True

743

raise

744

if pid:

745

gobject.source_remove(self.checker_callback_tag)

746

self.checker_callback(pid, status, command)

548

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

549

error)

747

550

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

748

551

return True

749

552

756

559

return

757

560

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

758

561

try:

759

self.checker.terminate()

562

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

760

563

#time.sleep(0.5)

761

564

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

762

# self.checker.kill()

565

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

763

566

except OSError as error:

764

567

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

765

568

raise

782

585

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

783

586

if byte_arrays and signature != "ay":

784

587

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

785

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

588

" signature %r" % signature)

786

589

def decorator(func):

787

590

func._dbus_is_property = True

788

591

func._dbus_interface = dbus_interface

796

599

return decorator

797

600

798

601

799

def dbus_interface_annotations(dbus_interface):

800

"""Decorator for marking functions returning interface annotations

801

802

Usage:

803

804

@dbus_interface_annotations("org.example.Interface")

805

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

806

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

807

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

808

"false"}

809

"""

810

def decorator(func):

811

func._dbus_is_interface = True

812

func._dbus_interface = dbus_interface

813

func._dbus_name = dbus_interface

814

return func

815

return decorator

816

817

818

def dbus_annotations(annotations):

819

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

820

Usage:

821

822

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

823

"org.freedesktop.DBus.Property."

824

"EmitsChangedSignal": "false"})

825

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

826

access="r")

827

def Property_dbus_property(self):

828

return dbus.Boolean(False)

829

"""

830

def decorator(func):

831

func._dbus_annotations = annotations

832

return func

833

return decorator

834

835

836

602

class DBusPropertyException(dbus.exceptions.DBusException):

837

603

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

838

604

"""

839

pass

605

def __unicode__(self):

606

return unicode(str(self))

607

840

608

841

609

class DBusPropertyAccessException(DBusPropertyException):

842

610

"""A property's access permissions disallows an operation.

859

627

"""

860

628

861

629

@staticmethod

862

def _is_dbus_thing(thing):

863

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

864

865

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

866

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

867

"""

868

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

869

False)

630

def _is_dbus_property(obj):

631

return getattr(obj, "_dbus_is_property", False)

870

632

871

def _get_all_dbus_things(self, thing):

633

def _get_all_dbus_properties(self):

872

634

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

873

635

"""

874

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

875

name),

876

athing.__get__(self))

636

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

877

637

for cls in self.__class__.__mro__

878

for name, athing in

879

inspect.getmembers(cls,

880

self._is_dbus_thing(thing)))

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

881

640

882

641

def _get_dbus_property(self, interface_name, property_name):

883

642

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

885

644

"""

886

645

for cls in self.__class__.__mro__:

887

646

for name, value in (inspect.getmembers

888

(cls,

889

self._is_dbus_thing("property"))):

647

(cls, self._is_dbus_property)):

890

648

if (value._dbus_name == property_name

891

649

and value._dbus_interface == interface_name):

892

650

return value.__get__(self)

920

678

# The byte_arrays option is not supported yet on

921

679

# signatures other than "ay".

922

680

if prop._dbus_signature != "ay":

923

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

924

"'ay' signature {!r}"

925

.format(prop._dbus_signature))

926

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

927

for byte in value))

681

raise ValueError

682

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

683

for byte in value))

928

684

prop(value)

929

685

930

686

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

935

691

936

692

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

937

693

"""

938

properties = {}

939

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

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

940

696

if (interface_name

941

697

and interface_name != prop._dbus_interface):

942

698

# Interface non-empty but did not match

946

702

continue

947

703

value = prop()

948

704

if not hasattr(value, "variant_level"):

949

properties[name] = value

705

all[name] = value

950

706

continue

951

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

952

value.variant_level+1)

953

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

954

955

@dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")

956

def PropertiesChanged(self, interface_name, changed_properties,

957

invalidated_properties):

958

"""Standard D-Bus PropertiesChanged() signal, see D-Bus

959

standard.

960

"""

961

pass

707

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

708

value.variant_level+1)

709

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

962

710

963

711

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

964

712

out_signature="s",

965

713

path_keyword='object_path',

966

714

connection_keyword='connection')

967

715

def Introspect(self, object_path, connection):

968

"""Overloading of standard D-Bus method.

969

970

Inserts property tags and interface annotation tags.

716

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

971

717

"""

972

718

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

973

719

connection)

980

726

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

981

727

return e

982

728

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

983

# Add property tags

984

729

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

985

730

for name, prop

986

in self._get_all_dbus_things("property")

731

in self._get_all_dbus_properties()

987

732

if prop._dbus_interface

988

733

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

989

734

if_tag.appendChild(tag)

990

# Add annotation tags

991

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

992

for tag in if_tag.getElementsByTagName(typ):

993

annots = dict()

994

for name, prop in (self.

995

_get_all_dbus_things(typ)):

996

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

997

and prop._dbus_interface

998

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

999

annots.update(getattr

1000

(prop,

1001

"_dbus_annotations",

1002

{}))

1003

for name, value in annots.items():

1004

ann_tag = document.createElement(

1005

"annotation")

1006

ann_tag.setAttribute("name", name)

1007

ann_tag.setAttribute("value", value)

1008

tag.appendChild(ann_tag)

1009

# Add interface annotation tags

1010

for annotation, value in dict(

1011

itertools.chain.from_iterable(

1012

annotations().items()

1013

for name, annotations in

1014

self._get_all_dbus_things("interface")

1015

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

1016

)).items():

1017

ann_tag = document.createElement("annotation")

1018

ann_tag.setAttribute("name", annotation)

1019

ann_tag.setAttribute("value", value)

1020

if_tag.appendChild(ann_tag)

1021

735

# Add the names to the return values for the

1022

736

# "org.freedesktop.DBus.Properties" methods

1023

737

if (if_tag.getAttribute("name")

1038

752

except (AttributeError, xml.dom.DOMException,

1039

753

xml.parsers.expat.ExpatError) as error:

1040

754

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

1041

exc_info=error)

755

error)

1042

756

return xmlstring

1043

757

1044

758

1045

def datetime_to_dbus(dt, variant_level=0):

759

def datetime_to_dbus (dt, variant_level=0):

1046

760

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

1047

761

if dt is None:

1048

762

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

1049

763

return dbus.String(dt.isoformat(),

1050

764

variant_level=variant_level)

1051

765

1052

1053

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1054

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

1055

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

1056

interface names according to the "alt_interface_names" mapping.

1057

Usage:

1058

1059

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

1060

"net.example.AlternateInterface"})

1061

class SampleDBusObject(dbus.service.Object):

1062

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

1063

def SampleDBusMethod():

1064

pass

1065

1066

The above "SampleDBusMethod" on "SampleDBusObject" will be

1067

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

1068

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

1069

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

1070

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

1071

1072

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

1073

(from DBusObjectWithProperties) and interfaces (from the

1074

dbus_interface_annotations decorator).

766

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

767

.__metaclass__):

768

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

769

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

1075

770

"""

1076

def wrapper(cls):

1077

for orig_interface_name, alt_interface_name in (

1078

alt_interface_names.items()):

1079

attr = {}

1080

interface_names = set()

1081

# Go though all attributes of the class

1082

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

771

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

772

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

773

# methods, signals, or properties in them

774

for base in (b for b in bases

775

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

776

# Go though all attributes of the base class

777

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

1083

778

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

1084

779

# with the wrong interface name

1085

780

if (not hasattr(attribute, "_dbus_interface")

1086

781

or not attribute._dbus_interface

1087

.startswith(orig_interface_name)):

782

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

1088

783

continue

1089

784

# Create an alternate D-Bus interface name based on

1090

785

# the current name

1091

786

alt_interface = (attribute._dbus_interface

1092

.replace(orig_interface_name,

1093

alt_interface_name))

1094

interface_names.add(alt_interface)

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1095

789

# Is this a D-Bus signal?

1096

790

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

1097

# Extract the original non-method undecorated

1098

# function by black magic

791

# Extract the original non-method function by

792

# black magic

1099

793

nonmethod_func = (dict(

1100

794

zip(attribute.func_code.co_freevars,

1101

795

attribute.__closure__))["func"]

1112

806

nonmethod_func.func_name,

1113

807

nonmethod_func.func_defaults,

1114

808

nonmethod_func.func_closure)))

1115

# Copy annotations, if any

1116

try:

1117

new_function._dbus_annotations = (

1118

dict(attribute._dbus_annotations))

1119

except AttributeError:

1120

pass

1121

809

# Define a creator of a function to call both the

1122

# original and alternate functions, so both the

1123

# original and alternate signals gets sent when

1124

# the function is called

810

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

811

# signals gets sent when the function is called

1125

812

def fixscope(func1, func2):

1126

813

"""This function is a scope container to pass

1127

814

func1 and func2 to the "call_both" function

1134

821

return call_both

1135

822

# Create the "call_both" function and add it to

1136

823

# the class

1137

attr[attrname] = fixscope(attribute, new_function)

824

attr[attrname] = fixscope(attribute,

825

new_function)

1138

826

# Is this a D-Bus method?

1139

827

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

1140

828

# Create a new, but exactly alike, function

1151

839

attribute.func_name,

1152

840

attribute.func_defaults,

1153

841

attribute.func_closure)))

1154

# Copy annotations, if any

1155

try:

1156

attr[attrname]._dbus_annotations = (

1157

dict(attribute._dbus_annotations))

1158

except AttributeError:

1159

pass

1160

842

# Is this a D-Bus property?

1161

843

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

1162

844

# Create a new, but exactly alike, function

1176

858

attribute.func_name,

1177

859

attribute.func_defaults,

1178

860

attribute.func_closure)))

1179

# Copy annotations, if any

1180

try:

1181

attr[attrname]._dbus_annotations = (

1182

dict(attribute._dbus_annotations))

1183

except AttributeError:

1184

pass

1185

# Is this a D-Bus interface?

1186

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

1187

# Create a new, but exactly alike, function

1188

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

1189

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

1190

# to the class.

1191

attr[attrname] = (dbus_interface_annotations

1192

(alt_interface)

1193

(types.FunctionType

1194

(attribute.func_code,

1195

attribute.func_globals,

1196

attribute.func_name,

1197

attribute.func_defaults,

1198

attribute.func_closure)))

1199

if deprecate:

1200

# Deprecate all alternate interfaces

1201

iname="_AlternateDBusNames_interface_annotation{}"

1202

for interface_name in interface_names:

1203

@dbus_interface_annotations(interface_name)

1204

def func(self):

1205

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

1206

"true" }

1207

# Find an unused name

1208

for aname in (iname.format(i)

1209

for i in itertools.count()):

1210

if aname not in attr:

1211

attr[aname] = func

1212

break

1213

if interface_names:

1214

# Replace the class with a new subclass of it with

1215

# methods, signals, etc. as created above.

1216

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

1217

(cls,), attr)

1218

return cls

1219

return wrapper

1220

1221

1222

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

1223

"se.bsnet.fukt.Mandos"})

861

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

862

1224

863

class ClientDBus(Client, DBusObjectWithProperties):

1225

864

"""A Client class using D-Bus

1226

865

1232

871

runtime_expansions = (Client.runtime_expansions

1233

872

+ ("dbus_object_path",))

1234

873

1235

_interface = "se.recompile.Mandos.Client"

1236

1237

874

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

1238

875

1239

876

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

877

self._approvals_pending = 0

1240

878

self.bus = bus

1241

879

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

1242

880

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

1243

881

# the D-Bus

1244

client_object_name = str(self.name).translate(

882

client_object_name = unicode(self.name).translate(

1245

883

{ord("."): ord("_"),

1246

884

ord("-"): ord("_")})

1247

885

self.dbus_object_path = (dbus.ObjectPath

1248

886

("/clients/" + client_object_name))

1249

887

DBusObjectWithProperties.__init__(self, self.bus,

1250

888

self.dbus_object_path)

1251

889

1252

890

def notifychangeproperty(transform_func,

1253

891

dbus_name, type_func=lambda x: x,

1254

variant_level=1, invalidate_only=False,

1255

_interface=_interface):

892

variant_level=1):

1256

893

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

1257

894

its changes to DBus.

1258

895

1259

896

transform_fun: Function that takes a value and a variant_level

1260

897

and transforms it to a D-Bus type.

1261

898

dbus_name: D-Bus name of the variable

1263

900

to the D-Bus. Default: no transform

1264

901

variant_level: D-Bus variant level. Default: 1

1265

902

"""

1266

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

903

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

1267

904

def setter(self, value):

1268

905

if hasattr(self, "dbus_object_path"):

1269

906

if (not hasattr(self, attrname) or

1270

907

type_func(getattr(self, attrname, None))

1271

908

!= type_func(value)):

1272

if invalidate_only:

1273

self.PropertiesChanged(_interface,

1274

dbus.Dictionary(),

1275

dbus.Array

1276

((dbus_name,)))

1277

else:

1278

dbus_value = transform_func(type_func(value),

1279

variant_level

1280

=variant_level)

1281

self.PropertyChanged(dbus.String(dbus_name),

1282

dbus_value)

1283

self.PropertiesChanged(_interface,

1284

dbus.Dictionary({

1285

dbus.String(dbus_name):

1286

dbus_value }), dbus.Array())

909

dbus_value = transform_func(type_func(value),

910

variant_level

911

=variant_level)

912

self.PropertyChanged(dbus.String(dbus_name),

913

dbus_value)

1287

914

setattr(self, attrname, value)

1288

915

1289

916

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

1290

917

918

1291

919

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1292

920

approvals_pending = notifychangeproperty(dbus.Boolean,

1293

921

"ApprovalPending",

1300

928

checker is not None)

1301

929

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1302

930

"LastCheckedOK")

1303

last_checker_status = notifychangeproperty(dbus.Int16,

1304

"LastCheckerStatus")

1305

931

last_approval_request = notifychangeproperty(

1306

932

datetime_to_dbus, "LastApprovalRequest")

1307

933

approved_by_default = notifychangeproperty(dbus.Boolean,

1308

934

"ApprovedByDefault")

1309

approval_delay = notifychangeproperty(dbus.UInt64,

935

approval_delay = notifychangeproperty(dbus.UInt16,

1310

936

"ApprovalDelay",

1311

937

type_func =

1312

lambda td: td.total_seconds()

1313

* 1000)

938

_timedelta_to_milliseconds)

1314

939

approval_duration = notifychangeproperty(

1315

dbus.UInt64, "ApprovalDuration",

1316

type_func = lambda td: td.total_seconds() * 1000)

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1317

942

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

1318

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

1319

type_func = lambda td:

1320

td.total_seconds() * 1000)

943

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

944

type_func =

945

_timedelta_to_milliseconds)

1321

946

extended_timeout = notifychangeproperty(

1322

dbus.UInt64, "ExtendedTimeout",

1323

type_func = lambda td: td.total_seconds() * 1000)

1324

interval = notifychangeproperty(dbus.UInt64,

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1325

950

"Interval",

1326

951

type_func =

1327

lambda td: td.total_seconds()

1328

* 1000)

952

_timedelta_to_milliseconds)

1329

953

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

1330

secret = notifychangeproperty(dbus.ByteArray, "Secret",

1331

invalidate_only=True)

1332

954

1333

955

del notifychangeproperty

1334

956

1361

983

*args, **kwargs)

1362

984

1363

985

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

1364

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

986

old_checker = self.checker

987

if self.checker is not None:

988

old_checker_pid = self.checker.pid

989

else:

990

old_checker_pid = None

1365

991

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

1366

992

# Only if new checker process was started

1367

993

if (self.checker is not None

1371

997

return r

1372

998

1373

999

def _reset_approved(self):

1374

self.approved = None

1000

self._approved = None

1375

1001

return False

1376

1002

1377

1003

def approve(self, value=True):

1378

self.approved = value

1379

gobject.timeout_add(int(self.approval_duration.total_seconds()

1380

* 1000), self._reset_approved)

1381

1004

self.send_changedstate()

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1007

(self.approval_duration),

1008

self._reset_approved)

1009

1382

1010

1383

1011

## D-Bus methods, signals & properties

1384

1385

## Interfaces

1012

_interface = "se.recompile.Mandos.Client"

1386

1013

1387

1014

## Signals

1388

1015

1399

1026

pass

1400

1027

1401

1028

# PropertyChanged - signal

1402

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

1403

1029

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

1404

1030

def PropertyChanged(self, property, value):

1405

1031

"D-Bus signal"

1481

1107

access="readwrite")

1482

1108

def ApprovalDelay_dbus_property(self, value=None):

1483

1109

if value is None: # get

1484

return dbus.UInt64(self.approval_delay.total_seconds()

1485

* 1000)

1110

return dbus.UInt64(self.approval_delay_milliseconds())

1486

1111

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

1487

1112

1488

1113

# ApprovalDuration - property

1490

1115

access="readwrite")

1491

1116

def ApprovalDuration_dbus_property(self, value=None):

1492

1117

if value is None: # get

1493

return dbus.UInt64(self.approval_duration.total_seconds()

1494

* 1000)

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1119

self.approval_duration))

1495

1120

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

1496

1121

1497

1122

# Name - property

1510

1135

def Host_dbus_property(self, value=None):

1511

1136

if value is None: # get

1512

1137

return dbus.String(self.host)

1513

self.host = str(value)

1138

self.host = value

1514

1139

1515

1140

# Created - property

1516

1141

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

1517

1142

def Created_dbus_property(self):

1518

return datetime_to_dbus(self.created)

1143

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

1519

1144

1520

1145

# LastEnabled - property

1521

1146

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

1542

1167

return

1543

1168

return datetime_to_dbus(self.last_checked_ok)

1544

1169

1545

# LastCheckerStatus - property

1546

@dbus_service_property(_interface, signature="n",

1547

access="read")

1548

def LastCheckerStatus_dbus_property(self):

1549

return dbus.Int16(self.last_checker_status)

1550

1551

1170

# Expires - property

1552

1171

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

1553

1172

def Expires_dbus_property(self):

1563

1182

access="readwrite")

1564

1183

def Timeout_dbus_property(self, value=None):

1565

1184

if value is None: # get

1566

return dbus.UInt64(self.timeout.total_seconds() * 1000)

1567

old_timeout = self.timeout

1185

return dbus.UInt64(self.timeout_milliseconds())

1568

1186

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

1569

# Reschedule disabling

1570

if self.enabled:

1571

now = datetime.datetime.utcnow()

1572

self.expires += self.timeout - old_timeout

1573

if self.expires <= now:

1574

# The timeout has passed

1575

self.disable()

1576

else:

1577

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

1578

is None):

1579

return

1580

gobject.source_remove(self.disable_initiator_tag)

1581

self.disable_initiator_tag = (

1582

gobject.timeout_add(

1583

int((self.expires - now).total_seconds()

1584

* 1000), self.disable))

1187

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

1188

return

1189

# Reschedule timeout

1190

gobject.source_remove(self.disable_initiator_tag)

1191

self.disable_initiator_tag = None

1192

self.expires = None

1193

time_to_die = _timedelta_to_milliseconds((self

1194

.last_checked_ok

1195

+ self.timeout)

1196

- datetime.datetime

1197

.utcnow())

1198

if time_to_die <= 0:

1199

# The timeout has passed

1200

self.disable()

1201

else:

1202

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

1203

+ datetime.timedelta(milliseconds =

1204

time_to_die))

1205

self.disable_initiator_tag = (gobject.timeout_add

1206

(time_to_die, self.disable))

1585

1207

1586

1208

# ExtendedTimeout - property

1587

1209

@dbus_service_property(_interface, signature="t",

1588

1210

access="readwrite")

1589

1211

def ExtendedTimeout_dbus_property(self, value=None):

1590

1212

if value is None: # get

1591

return dbus.UInt64(self.extended_timeout.total_seconds()

1592

* 1000)

1213

return dbus.UInt64(self.extended_timeout_milliseconds())

1593

1214

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

1594

1215

1595

1216

# Interval - property

1597

1218

access="readwrite")

1598

1219

def Interval_dbus_property(self, value=None):

1599

1220

if value is None: # get

1600

return dbus.UInt64(self.interval.total_seconds() * 1000)

1221

return dbus.UInt64(self.interval_milliseconds())

1601

1222

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

1602

1223

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

1603

1224

return

1604

if self.enabled:

1605

# Reschedule checker run

1606

gobject.source_remove(self.checker_initiator_tag)

1607

self.checker_initiator_tag = (gobject.timeout_add

1608

(value, self.start_checker))

1609

self.start_checker() # Start one now, too

1225

# Reschedule checker run

1226

gobject.source_remove(self.checker_initiator_tag)

1227

self.checker_initiator_tag = (gobject.timeout_add

1228

(value, self.start_checker))

1229

self.start_checker() # Start one now, too

1610

1230

1611

1231

# Checker - property

1612

1232

@dbus_service_property(_interface, signature="s",

1614

1234

def Checker_dbus_property(self, value=None):

1615

1235

if value is None: # get

1616

1236

return dbus.String(self.checker_command)

1617

self.checker_command = str(value)

1237

self.checker_command = value

1618

1238

1619

1239

# CheckerRunning - property

1620

1240

@dbus_service_property(_interface, signature="b",

1636

1256

@dbus_service_property(_interface, signature="ay",

1637

1257

access="write", byte_arrays=True)

1638

1258

def Secret_dbus_property(self, value):

1639

self.secret = bytes(value)

1259

self.secret = str(value)

1640

1260

1641

1261

del _interface

1642

1262

1649

1269

raise KeyError()

1650

1270

1651

1271

def __getattribute__(self, name):

1652

if name == '_pipe':

1272

if(name == '_pipe'):

1653

1273

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

1654

1274

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

1655

1275

data = self._pipe.recv()

1662

1282

return func

1663

1283

1664

1284

def __setattr__(self, name, value):

1665

if name == '_pipe':

1285

if(name == '_pipe'):

1666

1286

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

1667

1287

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

1668

1288

1289

class ClientDBusTransitional(ClientDBus):

1290

__metaclass__ = AlternateDBusNamesMetaclass

1669

1291

1670

1292

class ClientHandler(socketserver.BaseRequestHandler, object):

1671

1293

"""A class to handle client connections.

1676

1298

def handle(self):

1677

1299

with contextlib.closing(self.server.child_pipe) as child_pipe:

1678

1300

logger.info("TCP connection from: %s",

1679

str(self.client_address))

1301

unicode(self.client_address))

1680

1302

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

1681

1303

self.server.child_pipe.fileno())

1682

1304

1708

1330

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

1709

1331

try:

1710

1332

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

1711

raise RuntimeError(line)

1333

raise RuntimeError

1712

1334

except (ValueError, IndexError, RuntimeError) as error:

1713

1335

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

1714

1336

return

1754

1376

client.Rejected("Disabled")

1755

1377

return

1756

1378

1757

if client.approved or not client.approval_delay:

1379

if client._approved or not client.approval_delay:

1758

1380

#We are approved or approval is disabled

1759

1381

break

1760

elif client.approved is None:

1382

elif client._approved is None:

1761

1383

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

1762

1384

client.name)

1763

1385

if self.server.use_dbus:

1764

1386

# Emit D-Bus signal

1765

1387

client.NeedApproval(

1766

client.approval_delay.total_seconds()

1767

* 1000, client.approved_by_default)

1388

client.approval_delay_milliseconds(),

1389

client.approved_by_default)

1768

1390

else:

1769

1391

logger.warning("Client %s was not approved",

1770

1392

client.name)

1776

1398

#wait until timeout or approved

1777

1399

time = datetime.datetime.now()

1778

1400

client.changedstate.acquire()

1779

client.changedstate.wait(delay.total_seconds())

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1780

1404

client.changedstate.release()

1781

1405

time2 = datetime.datetime.now()

1782

1406

if (time2 - time) >= delay:

1798

1422

try:

1799

1423

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

1800

1424

except gnutls.errors.GNUTLSError as error:

1801

logger.warning("gnutls send failed",

1802

exc_info=error)

1425

logger.warning("gnutls send failed")

1803

1426

return

1804

1427

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

1805

1428

sent, len(client.secret)

1808

1431

1809

1432

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

1810

1433

# bump the timeout using extended_timeout

1811

client.bump_timeout(client.extended_timeout)

1434

client.checked_ok(client.extended_timeout)

1812

1435

if self.server.use_dbus:

1813

1436

# Emit D-Bus signal

1814

1437

client.GotSecret()

1819

1442

try:

1820

1443

session.bye()

1821

1444

except gnutls.errors.GNUTLSError as error:

1822

logger.warning("GnuTLS bye failed",

1823

exc_info=error)

1445

logger.warning("GnuTLS bye failed")

1824

1446

1825

1447

@staticmethod

1826

1448

def peer_certificate(session):

1882

1504

# Convert the buffer to a Python bytestring

1883

1505

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

1884

1506

# Convert the bytestring to hexadecimal notation

1885

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

1507

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

1886

1508

return hex_fpr

1887

1509

1888

1510

1891

1513

def sub_process_main(self, request, address):

1892

1514

try:

1893

1515

self.finish_request(request, address)

1894

except Exception:

1516

except:

1895

1517

self.handle_error(request, address)

1896

1518

self.close_request(request)

1897

1519

1898

1520

def process_request(self, request, address):

1899

1521

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

1900

1522

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

1901

args = (request, address))

1523

args = (request,

1524

address))

1902

1525

proc.start()

1903

1526

return proc

1904

1527

1919

1542

1920

1543

def add_pipe(self, parent_pipe, proc):

1921

1544

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

1922

raise NotImplementedError()

1545

raise NotImplementedError

1923

1546

1924

1547

1925

1548

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1932

1555

use_ipv6: Boolean; to use IPv6 or not

1933

1556

"""

1934

1557

def __init__(self, server_address, RequestHandlerClass,

1935

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

1936

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

1937

creating a new one with socket.socket().

1938

"""

1558

interface=None, use_ipv6=True):

1939

1559

self.interface = interface

1940

1560

if use_ipv6:

1941

1561

self.address_family = socket.AF_INET6

1942

if socketfd is not None:

1943

# Save the file descriptor

1944

self.socketfd = socketfd

1945

# Save the original socket.socket() function

1946

self.socket_socket = socket.socket

1947

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

1948

#

1949

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

1950

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

1951

# patching socket.socket.)

1952

#

1953

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

1954

@functools.wraps(socket.socket)

1955

def socket_wrapper(*args, **kwargs):

1956

# Restore original function so subsequent calls are

1957

# not affected.

1958

socket.socket = self.socket_socket

1959

del self.socket_socket

1960

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

1961

# saved file descriptor.

1962

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

1963

# Replace socket.socket() function with wrapper

1964

socket.socket = socket_wrapper

1965

# The socketserver.TCPServer.__init__ will call

1966

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

1967

# socket_wrapper(), if socketfd was set.

1968

1562

socketserver.TCPServer.__init__(self, server_address,

1969

1563

RequestHandlerClass)

1970

1971

1564

def server_bind(self):

1972

1565

"""This overrides the normal server_bind() function

1973

1566

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

1981

1574

try:

1982

1575

self.socket.setsockopt(socket.SOL_SOCKET,

1983

1576

SO_BINDTODEVICE,

1984

(self.interface + "\0")

1985

.encode("utf-8"))

1577

str(self.interface

1578

+ '\0'))

1986

1579

except socket.error as error:

1987

if error.errno == errno.EPERM:

1988

logger.error("No permission to bind to"

1989

" interface %s", self.interface)

1990

elif error.errno == errno.ENOPROTOOPT:

1580

if error[0] == errno.EPERM:

1581

logger.error("No permission to"

1582

" bind to interface %s",

1583

self.interface)

1584

elif error[0] == errno.ENOPROTOOPT:

1991

1585

logger.error("SO_BINDTODEVICE not available;"

1992

1586

" cannot bind to interface %s",

1993

1587

self.interface)

1994

elif error.errno == errno.ENODEV:

1995

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

1996

" cannot bind", self.interface)

1997

1588

else:

1998

1589

raise

1999

1590

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

2002

1593

if self.address_family == socket.AF_INET6:

2003

1594

any_address = "::" # in6addr_any

2004

1595

else:

2005

any_address = "0.0.0.0" # INADDR_ANY

1596

any_address = socket.INADDR_ANY

2006

1597

self.server_address = (any_address,

2007

1598

self.server_address[1])

2008

1599

elif not self.server_address[1]:

2029

1620

"""

2030

1621

def __init__(self, server_address, RequestHandlerClass,

2031

1622

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

2032

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

1623

gnutls_priority=None, use_dbus=True):

2033

1624

self.enabled = False

2034

1625

self.clients = clients

2035

1626

if self.clients is None:

2036

self.clients = {}

1627

self.clients = set()

2037

1628

self.use_dbus = use_dbus

2038

1629

self.gnutls_priority = gnutls_priority

2039

1630

IPv6_TCPServer.__init__(self, server_address,

2040

1631

RequestHandlerClass,

2041

1632

interface = interface,

2042

use_ipv6 = use_ipv6,

2043

socketfd = socketfd)

1633

use_ipv6 = use_ipv6)

2044

1634

def server_activate(self):

2045

1635

if self.enabled:

2046

1636

return socketserver.TCPServer.server_activate(self)

2059

1649

2060

1650

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

2061

1651

proc = None, client_object=None):

1652

condition_names = {

1653

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

1654

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

1655

# blocking).

1656

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

1657

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

1658

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

1659

# broken, usually for pipes and

1660

# sockets).

1661

}

1662

conditions_string = ' | '.join(name

1663

for cond, name in

1664

condition_names.iteritems()

1665

if cond & condition)

2062

1666

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

2063

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

1667

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

2064

1668

# Wait for other process to exit

2065

1669

proc.join()

2066

1670

return False

2073

1677

fpr = request[1]

2074

1678

address = request[2]

2075

1679

2076

for c in self.clients.itervalues():

1680

for c in self.clients:

2077

1681

if c.fingerprint == fpr:

2078

1682

client = c

2079

1683

break

2124

1728

return True

2125

1729

2126

1730

2127

def rfc3339_duration_to_delta(duration):

2128

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

2129

2130

>>> rfc3339_duration_to_delta("P7D")

2131

datetime.timedelta(7)

2132

>>> rfc3339_duration_to_delta("PT60S")

2133

datetime.timedelta(0, 60)

2134

>>> rfc3339_duration_to_delta("PT60M")

2135

datetime.timedelta(0, 3600)

2136

>>> rfc3339_duration_to_delta("PT24H")

2137

datetime.timedelta(1)

2138

>>> rfc3339_duration_to_delta("P1W")

2139

datetime.timedelta(7)

2140

>>> rfc3339_duration_to_delta("PT5M30S")

2141

datetime.timedelta(0, 330)

2142

>>> rfc3339_duration_to_delta("P1DT3M20S")

2143

datetime.timedelta(1, 200)

2144

"""

2145

2146

# Parsing an RFC 3339 duration with regular expressions is not

2147

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

2148

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

2149

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

2150

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

2151

# avoid excessive use of external libraries.

2152

2153

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

2154

Token = collections.namedtuple("Token",

2155

("regexp", # To match token; if

2156

# "value" is not None,

2157

# must have a "group"

2158

# containing digits

2159

"value", # datetime.timedelta or

2160

# None

2161

"followers")) # Tokens valid after

2162

# this token

2163

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

2164

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

2165

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

2166

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

2167

datetime.timedelta(seconds=1),

2168

frozenset((token_end,)))

2169

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

2170

datetime.timedelta(minutes=1),

2171

frozenset((token_second, token_end)))

2172

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

2173

datetime.timedelta(hours=1),

2174

frozenset((token_minute, token_end)))

2175

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

2176

None,

2177

frozenset((token_hour, token_minute,

2178

token_second)))

2179

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

2180

datetime.timedelta(days=1),

2181

frozenset((token_time, token_end)))

2182

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

2183

datetime.timedelta(weeks=4),

2184

frozenset((token_day, token_end)))

2185

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

2186

datetime.timedelta(weeks=52),

2187

frozenset((token_month, token_end)))

2188

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

2189

datetime.timedelta(weeks=1),

2190

frozenset((token_end,)))

2191

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

2192

frozenset((token_year, token_month,

2193

token_day, token_time,

2194

token_week)))

2195

# Define starting values

2196

value = datetime.timedelta() # Value so far

2197

found_token = None

2198

followers = frozenset((token_duration,)) # Following valid tokens

2199

s = duration # String left to parse

2200

# Loop until end token is found

2201

while found_token is not token_end:

2202

# Search for any currently valid tokens

2203

for token in followers:

2204

match = token.regexp.match(s)

2205

if match is not None:

2206

# Token found

2207

if token.value is not None:

2208

# Value found, parse digits

2209

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

2210

# Add to value so far

2211

value += factor * token.value

2212

# Strip token from string

2213

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

2214

# Go to found token

2215

found_token = token

2216

# Set valid next tokens

2217

followers = found_token.followers

2218

break

2219

else:

2220

# No currently valid tokens were found

2221

raise ValueError("Invalid RFC 3339 duration")

2222

# End token found

2223

return value

2224

2225

2226

1731

def string_to_delta(interval):

2227

1732

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

2228

1733

2239

1744

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

2240

1745

datetime.timedelta(0, 330)

2241

1746

"""

2242

2243

try:

2244

return rfc3339_duration_to_delta(interval)

2245

except ValueError:

2246

pass

2247

2248

1747

timevalue = datetime.timedelta(0)

2249

1748

for s in interval.split():

2250

1749

try:

2251

suffix = s[-1]

1750

suffix = unicode(s[-1])

2252

1751

value = int(s[:-1])

2253

1752

if suffix == "d":

2254

1753

delta = datetime.timedelta(value)

2261

1760

elif suffix == "w":

2262

1761

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

2263

1762

else:

2264

raise ValueError("Unknown suffix {!r}"

2265

.format(suffix))

2266

except IndexError as e:

1763

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

1764

except (ValueError, IndexError) as e:

2267

1765

raise ValueError(*(e.args))

2268

1766

timevalue += delta

2269

1767

return timevalue

2270

1768

2271

1769

1770

def if_nametoindex(interface):

1771

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

1772

1773

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

1774

global if_nametoindex

1775

try:

1776

if_nametoindex = (ctypes.cdll.LoadLibrary

1777

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

1778

.if_nametoindex)

1779

except (OSError, AttributeError):

1780

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

1781

def if_nametoindex(interface):

1782

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

1783

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

1784

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

1785

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1786

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

1787

interface))

1788

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

1789

ifreq[16:20])[0]

1790

return interface_index

1791

return if_nametoindex(interface)

1792

1793

2272

1794

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

2273

1795

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

2274

1796

2282

1804

sys.exit()

2283

1805

if not noclose:

2284

1806

# Close all standard open file descriptors

2285

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

1807

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

2286

1808

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

2287

raise OSError(errno.ENODEV, "{} not a character device"

2288

.format(os.devnull))

1809

raise OSError(errno.ENODEV,

1810

"%s not a character device"

1811

% os.path.devnull)

2289

1812

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

2290

1813

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

2291

1814

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

2300

1823

2301

1824

parser = argparse.ArgumentParser()

2302

1825

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

2303

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

1826

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

2304

1827

help="show version number and exit")

2305

1828

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

2306

1829

help="Bind to interface IF")

2312

1835

help="Run self-test")

2313

1836

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

2314

1837

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

2315

" to terminal", default=None)

1838

" to terminal")

2316

1839

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

2317

1840

help="Debug level for stdout output")

2318

1841

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

2325

1848

" files")

2326

1849

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

2327

1850

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

2328

" system bus interface", default=None)

1851

" system bus interface")

2329

1852

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

2330

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

2331

default=None)

2332

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

2333

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

2334

" state", default=None)

2335

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

2336

help="Specify a file descriptor to a network"

2337

" socket to use instead of creating one")

2338

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

2339

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

2340

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

2341

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

2342

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

2343

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

2344

default=None)

2345

1853

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

2346

1854

options = parser.parse_args()

2347

1855

2348

1856

if options.check:

2349

1857

import doctest

2350

fail_count, test_count = doctest.testmod()

2351

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

1858

doctest.testmod()

1859

sys.exit()

2352

1860

2353

1861

# Default values for config file for server-global settings

2354

1862

server_defaults = { "interface": "",

2356

1864

"port": "",

2357

1865

"debug": "False",

2358

1866

"priority":

2359

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

1867

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

2360

1868

"servicename": "Mandos",

2361

1869

"use_dbus": "True",

2362

1870

"use_ipv6": "True",

2363

1871

"debuglevel": "",

2364

"restore": "True",

2365

"socket": "",

2366

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

2367

"foreground": "False",

2368

"zeroconf": "True",

2369

1872

}

2370

1873

2371

1874

# Parse config file for server-global settings

2376

1879

# Convert the SafeConfigParser object to a dict

2377

1880

server_settings = server_config.defaults()

2378

1881

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

2379

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

1882

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

2380

1883

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

2381

1884

option)

2382

1885

if server_settings["port"]:

2383

1886

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

2384

1887

"port")

2385

if server_settings["socket"]:

2386

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

2387

"socket")

2388

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

2389

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

2390

# happen with a supplied network socket.

2391

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

2392

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

2393

["socket"])

2394

1888

del server_config

2395

1889

2396

1890

# Override the settings from the config file with command line

2397

1891

# options, if set.

2398

1892

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

2399

1893

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

2400

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

2401

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

1894

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

2402

1895

value = getattr(options, option)

2403

1896

if value is not None:

2404

1897

server_settings[option] = value

2405

1898

del options

2406

1899

# Force all strings to be unicode

2407

1900

for option in server_settings.keys():

2408

if isinstance(server_settings[option], bytes):

2409

server_settings[option] = (server_settings[option]

2410

.decode("utf-8"))

2411

# Force all boolean options to be boolean

2412

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

2413

"foreground", "zeroconf"):

2414

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

2415

# Debug implies foreground

2416

if server_settings["debug"]:

2417

server_settings["foreground"] = True

1901

if type(server_settings[option]) is str:

1902

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

2418

1903

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

2419

1904

2420

1905

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

2421

1906

2422

if (not server_settings["zeroconf"] and

2423

not (server_settings["port"]

2424

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

2425

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

2426

" Zeroconf")

2427

2428

1907

# For convenience

2429

1908

debug = server_settings["debug"]

2430

1909

debuglevel = server_settings["debuglevel"]

2431

1910

use_dbus = server_settings["use_dbus"]

2432

1911

use_ipv6 = server_settings["use_ipv6"]

2433

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

2434

stored_state_file)

2435

foreground = server_settings["foreground"]

2436

zeroconf = server_settings["zeroconf"]

2437

2438

if debug:

2439

initlogger(debug, logging.DEBUG)

2440

else:

2441

if not debuglevel:

2442

initlogger(debug)

2443

else:

2444

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

2445

initlogger(debug, level)

2446

1912

2447

1913

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

2448

1914

syslogger.setFormatter(logging.Formatter

2449

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

2450

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

2451

.format(server_settings

2452

["servicename"])))

1915

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

1916

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

1917

% server_settings["servicename"]))

2453

1918

2454

1919

# Parse config file with clients

2455

client_config = configparser.SafeConfigParser(Client

2456

.client_defaults)

1920

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

1921

"extended_timeout": "15m",

1922

"interval": "2m",

1923

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

1924

"host": "",

1925

"approval_delay": "0s",

1926

"approval_duration": "1s",

1927

}

1928

client_config = configparser.SafeConfigParser(client_defaults)

2457

1929

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

2458

1930

"clients.conf"))

2459

1931

2460

1932

global mandos_dbus_service

2461

1933

mandos_dbus_service = None

2462

1934

2463

socketfd = None

2464

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

2465

socketfd = server_settings["socket"]

2466

1935

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

2467

1936

server_settings["port"]),

2468

1937

ClientHandler,

2471

1940

use_ipv6=use_ipv6,

2472

1941

gnutls_priority=

2473

1942

server_settings["priority"],

2474

use_dbus=use_dbus,

2475

socketfd=socketfd)

2476

if not foreground:

2477

pidfilename = "/run/mandos.pid"

2478

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

2479

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

2480

pidfile = None

1943

use_dbus=use_dbus)

1944

if not debug:

1945

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

2481

1946

try:

2482

1947

pidfile = open(pidfilename, "w")

2483

except IOError as e:

2484

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

2485

exc_info=e)

1948

except IOError:

1949

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

2486

1950

2487

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

1951

try:

1952

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

1953

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

1954

except KeyError:

2488

1955

try:

2489

uid = pwd.getpwnam(name).pw_uid

2490

gid = pwd.getpwnam(name).pw_gid

2491

break

1956

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

1957

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

2492

1958

except KeyError:

2493

continue

2494

else:

2495

uid = 65534

2496

gid = 65534

1959

try:

1960

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

1961

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

1962

except KeyError:

1963

uid = 65534

1964

gid = 65534

2497

1965

try:

2498

1966

os.setgid(gid)

2499

1967

os.setuid(uid)

2500

1968

except OSError as error:

2501

if error.errno != errno.EPERM:

2502

raise

1969

if error[0] != errno.EPERM:

1970

raise error

1971

1972

if not debug and not debuglevel:

1973

syslogger.setLevel(logging.WARNING)

1974

console.setLevel(logging.WARNING)

1975

if debuglevel:

1976

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

1977

syslogger.setLevel(level)

1978

console.setLevel(level)

2503

1979

2504

1980

if debug:

2505

1981

# Enable all possible GnuTLS debugging

2516

1992

.gnutls_global_set_log_function(debug_gnutls))

2517

1993

2518

1994

# Redirect stdin so all checkers get /dev/null

2519

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

1995

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

2520

1996

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

2521

1997

if null > 2:

2522

1998

os.close(null)

1999

else:

2000

# No console logging

2001

logger.removeHandler(console)

2523

2002

2524

2003

# Need to fork before connecting to D-Bus

2525

if not foreground:

2004

if not debug:

2526

2005

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

2527

2006

daemon()

2528

2007

2529

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

2530

# need to inform gobject that threads will be used.

2531

gobject.threads_init()

2532

2533

2008

global main_loop

2534

2009

# From the Avahi example code

2535

DBusGMainLoop(set_as_default=True)

2010

DBusGMainLoop(set_as_default=True )

2536

2011

main_loop = gobject.MainLoop()

2537

2012

bus = dbus.SystemBus()

2538

2013

# End of Avahi example code

2544

2019

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

2545

2020

do_not_queue=True))

2546

2021

except dbus.exceptions.NameExistsException as e:

2547

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

2022

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

2548

2023

use_dbus = False

2549

2024

server_settings["use_dbus"] = False

2550

2025

tcp_server.use_dbus = False

2551

if zeroconf:

2552

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2553

service = AvahiServiceToSyslog(name =

2554

server_settings["servicename"],

2555

servicetype = "_mandos._tcp",

2556

protocol = protocol, bus = bus)

2557

if server_settings["interface"]:

2558

service.interface = (if_nametoindex

2559

(server_settings["interface"]

2560

.encode("utf-8")))

2026

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2027

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

2028

servicetype = "_mandos._tcp",

2029

protocol = protocol, bus = bus)

2030

if server_settings["interface"]:

2031

service.interface = (if_nametoindex

2032

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

2561

2033

2562

2034

global multiprocessing_manager

2563

2035

multiprocessing_manager = multiprocessing.Manager()

2564

2036

2565

2037

client_class = Client

2566

2038

if use_dbus:

2567

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

2568

2569

client_settings = Client.config_parser(client_config)

2570

old_client_settings = {}

2571

clients_data = {}

2572

2573

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

2574

global wnull

2575

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

2576

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

2577

# mode

2578

if debug or not foreground:

2579

wnull.close()

2580

2581

# Get client data and settings from last running state.

2582

if server_settings["restore"]:

2583

try:

2584

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

2585

clients_data, old_client_settings = (pickle.load

2586

(stored_state))

2587

os.remove(stored_state_path)

2588

except IOError as e:

2589

if e.errno == errno.ENOENT:

2590

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

2591

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

2592

else:

2593

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

2594

exc_info=e)

2595

raise

2596

except EOFError as e:

2597

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

2598

"EOFError:", exc_info=e)

2599

2600

with PGPEngine() as pgp:

2601

for client_name, client in clients_data.items():

2602

# Skip removed clients

2603

if client_name not in client_settings:

2604

continue

2605

2606

# Decide which value to use after restoring saved state.

2607

# We have three different values: Old config file,

2608

# new config file, and saved state.

2609

# New config value takes precedence if it differs from old

2610

# config value, otherwise use saved state.

2611

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

2612

try:

2613

# For each value in new config, check if it

2614

# differs from the old config value (Except for

2615

# the "secret" attribute)

2616

if (name != "secret" and

2617

value != old_client_settings[client_name]

2618

[name]):

2619

client[name] = value

2620

except KeyError:

2621

pass

2622

2623

# Clients who has passed its expire date can still be

2624

# enabled if its last checker was successful. Clients

2625

# whose checker succeeded before we stored its state is

2626

# assumed to have successfully run all checkers during

2627

# downtime.

2628

if client["enabled"]:

2629

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

2630

if not client["last_checked_ok"]:

2631

logger.warning(

2632

"disabling client {} - Client never "

2633

"performed a successful checker"

2634

.format(client_name))

2635

client["enabled"] = False

2636

elif client["last_checker_status"] != 0:

2637

logger.warning(

2638

"disabling client {} - Client last"

2639

" checker failed with error code {}"

2640

.format(client_name,

2641

client["last_checker_status"]))

2642

client["enabled"] = False

2643

else:

2644

client["expires"] = (datetime.datetime

2645

.utcnow()

2646

+ client["timeout"])

2647

logger.debug("Last checker succeeded,"

2648

" keeping {} enabled"

2649

.format(client_name))

2039

client_class = functools.partial(ClientDBusTransitional,

2040

bus = bus)

2041

def client_config_items(config, section):

2042

special_settings = {

2043

"approved_by_default":

2044

lambda: config.getboolean(section,

2045

"approved_by_default"),

2046

}

2047

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

2650

2048

try:

2651

client["secret"] = (

2652

pgp.decrypt(client["encrypted_secret"],

2653

client_settings[client_name]

2654

["secret"]))

2655

except PGPError:

2656

# If decryption fails, we use secret from new settings

2657

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

2658

.format(client_name))

2659

client["secret"] = (

2660

client_settings[client_name]["secret"])

2661

2662

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

2663

for client_name in (set(old_client_settings)

2664

- set(client_settings)):

2665

del clients_data[client_name]

2666

for client_name in (set(client_settings)

2667

- set(old_client_settings)):

2668

clients_data[client_name] = client_settings[client_name]

2669

2670

# Create all client objects

2671

for client_name, client in clients_data.items():

2672

tcp_server.clients[client_name] = client_class(

2673

name = client_name, settings = client,

2674

server_settings = server_settings)

2675

2049

yield (name, special_settings[name]())

2050

except KeyError:

2051

yield (name, value)

2052

2053

tcp_server.clients.update(set(

2054

client_class(name = section,

2055

config= dict(client_config_items(

2056

client_config, section)))

2057

for section in client_config.sections()))

2676

2058

if not tcp_server.clients:

2677

2059

logger.warning("No clients defined")

2678

2679

if not foreground:

2680

if pidfile is not None:

2681

try:

2682

with pidfile:

2683

pid = os.getpid()

2684

pidfile.write("{}\n".format(pid).encode("utf-8"))

2685

except IOError:

2686

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

2687

pidfilename, pid)

2688

del pidfile

2060

2061

if not debug:

2062

try:

2063

with pidfile:

2064

pid = os.getpid()

2065

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

2066

del pidfile

2067

except IOError:

2068

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

2069

pidfilename, pid)

2070

except NameError:

2071

# "pidfile" was never created

2072

pass

2689

2073

del pidfilename

2074

2075

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

2690

2076

2691

2077

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

2692

2078

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

2693

2079

2694

2080

if use_dbus:

2695

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

2696

"se.bsnet.fukt.Mandos"})

2697

class MandosDBusService(DBusObjectWithProperties):

2081

class MandosDBusService(dbus.service.Object):

2698

2082

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

2699

2083

def __init__(self):

2700

2084

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

2701

2085

_interface = "se.recompile.Mandos"

2702

2086

2703

@dbus_interface_annotations(_interface)

2704

def _foo(self):

2705

return { "org.freedesktop.DBus.Property"

2706

".EmitsChangedSignal":

2707

"false"}

2708

2709

2087

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

2710

2088

def ClientAdded(self, objpath):

2711

2089

"D-Bus signal"

2725

2103

def GetAllClients(self):

2726

2104

"D-Bus method"

2727

2105

return dbus.Array(c.dbus_object_path

2728

for c in

2729

tcp_server.clients.itervalues())

2106

for c in tcp_server.clients)

2730

2107

2731

2108

@dbus.service.method(_interface,

2732

2109

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

2733

2110

def GetAllClientsWithProperties(self):

2734

2111

"D-Bus method"

2735

2112

return dbus.Dictionary(

2736

{ c.dbus_object_path: c.GetAll("")

2737

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

2113

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

2114

for c in tcp_server.clients),

2738

2115

signature="oa{sv}")

2739

2116

2740

2117

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

2741

2118

def RemoveClient(self, object_path):

2742

2119

"D-Bus method"

2743

for c in tcp_server.clients.itervalues():

2120

for c in tcp_server.clients:

2744

2121

if c.dbus_object_path == object_path:

2745

del tcp_server.clients[c.name]

2122

tcp_server.clients.remove(c)

2746

2123

c.remove_from_connection()

2747

2124

# Don't signal anything except ClientRemoved

2748

2125

c.disable(quiet=True)

2753

2130

2754

2131

del _interface

2755

2132

2756

mandos_dbus_service = MandosDBusService()

2133

class MandosDBusServiceTransitional(MandosDBusService):

2134

__metaclass__ = AlternateDBusNamesMetaclass

2135

mandos_dbus_service = MandosDBusServiceTransitional()

2757

2136

2758

2137

def cleanup():

2759

2138

"Cleanup function; run on exit"

2760

if zeroconf:

2761

service.cleanup()

2139

service.cleanup()

2762

2140

2763

2141

multiprocessing.active_children()

2764

wnull.close()

2765

if not (tcp_server.clients or client_settings):

2766

return

2767

2768

# Store client before exiting. Secrets are encrypted with key

2769

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

2770

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

2771

clients = {}

2772

with PGPEngine() as pgp:

2773

for client in tcp_server.clients.itervalues():

2774

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

2775

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

2776

key)

2777

client_dict = {}

2778

2779

# A list of attributes that can not be pickled

2780

# + secret.

2781

exclude = { "bus", "changedstate", "secret",

2782

"checker", "server_settings" }

2783

for name, typ in (inspect.getmembers

2784

(dbus.service.Object)):

2785

exclude.add(name)

2786

2787

client_dict["encrypted_secret"] = (client

2788

.encrypted_secret)

2789

for attr in client.client_structure:

2790

if attr not in exclude:

2791

client_dict[attr] = getattr(client, attr)

2792

2793

clients[client.name] = client_dict

2794

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

2795

2796

try:

2797

with (tempfile.NamedTemporaryFile

2798

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

2799

dir=os.path.dirname(stored_state_path),

2800

delete=False)) as stored_state:

2801

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

2802

tempname=stored_state.name

2803

os.rename(tempname, stored_state_path)

2804

except (IOError, OSError) as e:

2805

if not debug:

2806

try:

2807

os.remove(tempname)

2808

except NameError:

2809

pass

2810

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

2811

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

2812

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

2813

else:

2814

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

2815

exc_info=e)

2816

raise

2817

2818

# Delete all clients, and settings from config

2819

2142

while tcp_server.clients:

2820

name, client = tcp_server.clients.popitem()

2143

client = tcp_server.clients.pop()

2821

2144

if use_dbus:

2822

2145

client.remove_from_connection()

2146

client.disable_hook = None

2823

2147

# Don't signal anything except ClientRemoved

2824

2148

client.disable(quiet=True)

2825

2149

if use_dbus:

2827

2151

mandos_dbus_service.ClientRemoved(client

2828

2152

.dbus_object_path,

2829

2153

client.name)

2830

client_settings.clear()

2831

2154

2832

2155

atexit.register(cleanup)

2833

2156

2834

for client in tcp_server.clients.itervalues():

2157

for client in tcp_server.clients:

2835

2158

if use_dbus:

2836

2159

# Emit D-Bus signal

2837

2160

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2838

# Need to initiate checking of clients

2839

if client.enabled:

2840

client.init_checker()

2161

client.enable()

2841

2162

2842

2163

tcp_server.enable()

2843

2164

tcp_server.server_activate()

2844

2165

2845

2166

# Find out what port we got

2846

if zeroconf:

2847

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

2167

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

2848

2168

if use_ipv6:

2849

2169

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

2850

" flowinfo %d, scope_id %d",

2851

*tcp_server.socket.getsockname())

2170

" flowinfo %d, scope_id %d"

2171

% tcp_server.socket.getsockname())

2852

2172

else: # IPv4

2853

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

2854

*tcp_server.socket.getsockname())

2173

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

2174

% tcp_server.socket.getsockname())

2855

2175

2856

2176

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

2857

2177

2858

2178

try:

2859

if zeroconf:

2860

# From the Avahi example code

2861

try:

2862

service.activate()

2863

except dbus.exceptions.DBusException as error:

2864

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

2865

cleanup()

2866

sys.exit(1)

2867

# End of Avahi example code

2179

# From the Avahi example code

2180

try:

2181

service.activate()

2182

except dbus.exceptions.DBusException as error:

2183

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

2184

cleanup()

2185

sys.exit(1)

2186

# End of Avahi example code

2868

2187

2869

2188

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

2870

2189

lambda *args, **kwargs:

2874

2193

logger.debug("Starting main loop")

2875

2194

main_loop.run()

2876

2195

except AvahiError as error:

2877

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

2196

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

2878

2197

cleanup()

2879

2198

sys.exit(1)

2880

2199

except KeyboardInterrupt:

2885

2204

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

2886

2205

cleanup()

2887

2206

2207

2888

2208

if __name__ == '__main__':

2889

2209

main()