/mandos/trunk : revision 738.1.2

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#!/usr/bin/python

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#!/usr/bin/python2.7

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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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version = "1.4.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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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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class AvahiError(Exception):

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

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self.value = value

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

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**kwargs)

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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def rename(self, remove=True):

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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 = unicode(self.server

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.GetAlternativeServiceName(self.name))

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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if remove:

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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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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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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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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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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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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dbus.exceptions.DBusException):

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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

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def _timedelta_to_milliseconds(td):

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"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 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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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_enabled: datetime.datetime(); (UTC)

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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

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

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"last_approval_request", "last_checked_ok",

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

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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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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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self.name = name

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if config is None:

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config = {}

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.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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logger.debug("Creating client %r", self.name)

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

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

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if "secret" in config:

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

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elif "secfile" in config:

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

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(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

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

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self.created = datetime.datetime.utcnow()

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self.enabled = False

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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.created = settings.get("created",

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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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

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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",

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True)

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self.approved = None

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self.approvals_pending = 0

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self.approval_delay = string_to_delta(

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config["approval_delay"])

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self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

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.Condition(multiprocessing_manager

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.Lock()))

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self.client_structure = [attr for attr in

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self.__dict__.iterkeys()

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if not attr.startswith("_")]

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self.client_structure.append("client_structure")

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

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lambda obj:

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isinstance(obj,

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property)):

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if not name.startswith("_"):

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self.client_structure.append(name)

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# Send notice to process children that client state has changed

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def send_changedstate(self):

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self.changedstate.acquire()

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self.changedstate.notify_all()

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self.changedstate.release()

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with self.changedstate:

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self.changedstate.notify_all()

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def enable(self):

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

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

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# Already enabled

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return

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self.send_changedstate()

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

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# and every interval from then on.

402

self.checker_initiator_tag = (gobject.timeout_add

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(self.interval_milliseconds(),

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self.start_checker))

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

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

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self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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# Also start a new checker *right now*.

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self.start_checker()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

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if not quiet:

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self.send_changedstate()

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if not quiet:

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

423

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

589

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

424

590

gobject.source_remove(self.disable_initiator_tag)

425

591

self.disable_initiator_tag = None

426

592

self.expires = None

427

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

593

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

428

594

gobject.source_remove(self.checker_initiator_tag)

429

595

self.checker_initiator_tag = None

430

596

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

433

597

self.enabled = False

598

if not quiet:

599

self.send_changedstate()

434

600

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

435

601

return False

436

602

437

603

def __del__(self):

438

self.disable_hook = None

439

604

self.disable()

440

605

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

441

625

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

442

626

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

443

627

self.checker_callback_tag = None

444

628

self.checker = None

445

629

if os.WIFEXITED(condition):

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

630

self.last_checker_status = os.WEXITSTATUS(condition)

631

if self.last_checker_status == 0:

448

632

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

449

633

vars(self))

450

634

self.checked_ok()

452

636

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

453

637

vars(self))

454

638

else:

639

self.last_checker_status = -1

455

640

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

456

641

vars(self))

457

642

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

"""

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."""

464

651

if timeout is None:

465

652

timeout = self.timeout

466

self.last_checked_ok = datetime.datetime.utcnow()

467

gobject.source_remove(self.disable_initiator_tag)

468

self.disable_initiator_tag = (gobject.timeout_add

469

(_timedelta_to_milliseconds

470

(timeout), self.disable))

471

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

653

if self.disable_initiator_tag is not None:

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

656

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

657

self.disable_initiator_tag = (gobject.timeout_add

658

(int(timeout.total_seconds()

659

* 1000), self.disable))

660

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

472

661

473

662

def need_approval(self):

474

663

self.last_approval_request = datetime.datetime.utcnow()

479

668

If a checker already exists, leave it running and do

480

669

nothing."""

481

670

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

482

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

483

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

484

# client would inevitably timeout, since no checker would get

485

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

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

486

675

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

487

676

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

488

677

# should be.

490

679

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

491

680

try:

492

681

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

493

except (AttributeError, OSError) as error:

494

if (isinstance(error, OSError)

495

and error.errno != errno.ECHILD):

496

raise error

682

except AttributeError:

683

pass

684

except OSError as error:

685

if error.errno != errno.ECHILD:

686

raise

497

687

else:

498

688

if pid:

499

689

logger.warning("Checker was a zombie")

502

692

self.current_checker_command)

503

693

# Start a new checker if needed

504

694

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 }

505

699

try:

506

# In case checker_command has exactly one % operator

507

command = self.checker_command % self.host

508

except TypeError:

509

# Escape attributes for the shell

510

escaped_attrs = dict(

511

(attr,

512

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

513

errors=

514

'replace')))

515

for attr in

516

self.runtime_expansions)

517

518

try:

519

command = self.checker_command % escaped_attrs

520

except TypeError as error:

521

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

522

' %s', self.checker_command, error)

523

return True # Try again later

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

524

705

self.current_checker_command = command

525

706

try:

526

707

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

529

710

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

530

711

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

531

712

# 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 })

532

721

self.checker = subprocess.Popen(command,

533

722

close_fds=True,

534

shell=True, cwd="/")

535

self.checker_callback_tag = (gobject.child_watch_add

536

(self.checker.pid,

537

self.checker_callback,

538

data=command))

539

# The checker may have completed before the gobject

540

# watch was added. Check for this.

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:

541

736

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

542

if pid:

543

gobject.source_remove(self.checker_callback_tag)

544

self.checker_callback(pid, status, command)

545

737

except OSError as error:

546

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

547

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

747

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

549

748

return True

550

749

557

756

return

558

757

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

559

758

try:

560

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

759

self.checker.terminate()

561

760

#time.sleep(0.5)

562

761

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

563

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

762

# self.checker.kill()

564

763

except OSError as error:

565

764

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

566

765

raise

583

782

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

584

783

if byte_arrays and signature != "ay":

585

784

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

586

" signature %r" % signature)

785

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

587

786

def decorator(func):

588

787

func._dbus_is_property = True

589

788

func._dbus_interface = dbus_interface

597

796

return decorator

598

797

599

798

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

600

836

class DBusPropertyException(dbus.exceptions.DBusException):

601

837

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

602

838

"""

603

def __unicode__(self):

604

return unicode(str(self))

605

839

pass

606

840

607

841

class DBusPropertyAccessException(DBusPropertyException):

608

842

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

625

859

"""

626

860

627

861

@staticmethod

628

def _is_dbus_property(obj):

629

return getattr(obj, "_dbus_is_property", False)

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

870

631

def _get_all_dbus_properties(self):

871

def _get_all_dbus_things(self, thing):

632

872

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

633

873

"""

634

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

874

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

875

name),

876

athing.__get__(self))

635

877

for cls in self.__class__.__mro__

636

for name, prop in

637

inspect.getmembers(cls, self._is_dbus_property))

878

for name, athing in

879

inspect.getmembers(cls,

880

self._is_dbus_thing(thing)))

638

881

639

882

def _get_dbus_property(self, interface_name, property_name):

640

883

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

642

885

"""

643

886

for cls in self.__class__.__mro__:

644

887

for name, value in (inspect.getmembers

645

(cls, self._is_dbus_property)):

888

(cls,

889

self._is_dbus_thing("property"))):

646

890

if (value._dbus_name == property_name

647

891

and value._dbus_interface == interface_name):

648

892

return value.__get__(self)

676

920

# The byte_arrays option is not supported yet on

677

921

# signatures other than "ay".

678

922

if prop._dbus_signature != "ay":

679

raise ValueError

680

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

681

for byte in value))

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))

682

928

prop(value)

683

929

684

930

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

689

935

690

936

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

691

937

"""

692

all = {}

693

for name, prop in self._get_all_dbus_properties():

938

properties = {}

939

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

694

940

if (interface_name

695

941

and interface_name != prop._dbus_interface):

696

942

# Interface non-empty but did not match

700

946

continue

701

947

value = prop()

702

948

if not hasattr(value, "variant_level"):

703

all[name] = value

949

properties[name] = value

704

950

continue

705

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

706

value.variant_level+1)

707

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

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

708

962

709

963

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

710

964

out_signature="s",

711

965

path_keyword='object_path',

712

966

connection_keyword='connection')

713

967

def Introspect(self, object_path, connection):

714

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

968

"""Overloading of standard D-Bus method.

969

970

Inserts property tags and interface annotation tags.

715

971

"""

716

972

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

717

973

connection)

724

980

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

725

981

return e

726

982

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

983

# Add property tags

727

984

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

728

985

for name, prop

729

in self._get_all_dbus_properties()

986

in self._get_all_dbus_things("property")

730

987

if prop._dbus_interface

731

988

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

732

989

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)

733

1021

# Add the names to the return values for the

734

1022

# "org.freedesktop.DBus.Properties" methods

735

1023

if (if_tag.getAttribute("name")

750

1038

except (AttributeError, xml.dom.DOMException,

751

1039

xml.parsers.expat.ExpatError) as error:

752

1040

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

753

error)

1041

exc_info=error)

754

1042

return xmlstring

755

1043

756

1044

757

def datetime_to_dbus (dt, variant_level=0):

1045

def datetime_to_dbus(dt, variant_level=0):

758

1046

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

759

1047

if dt is None:

760

1048

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

761

1049

return dbus.String(dt.isoformat(),

762

1050

variant_level=variant_level)

763

1051

764

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

765

.__metaclass__):

766

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

767

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

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).

768

1075

"""

769

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

770

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

771

# methods, signals, or properties in them

772

for base in (b for b in bases

773

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

774

# Go though all attributes of the base class

775

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

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):

776

1083

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

777

1084

# with the wrong interface name

778

1085

if (not hasattr(attribute, "_dbus_interface")

779

1086

or not attribute._dbus_interface

780

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

1087

.startswith(orig_interface_name)):

781

1088

continue

782

1089

# Create an alternate D-Bus interface name based on

783

1090

# the current name

784

1091

alt_interface = (attribute._dbus_interface

785

.replace("se.recompile.Mandos",

786

"se.bsnet.fukt.Mandos"))

1092

.replace(orig_interface_name,

1093

alt_interface_name))

1094

interface_names.add(alt_interface)

787

1095

# Is this a D-Bus signal?

788

1096

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

789

# Extract the original non-method function by

790

# black magic

1097

# Extract the original non-method undecorated

1098

# function by black magic

791

1099

nonmethod_func = (dict(

792

1100

zip(attribute.func_code.co_freevars,

793

1101

attribute.__closure__))["func"]

804

1112

nonmethod_func.func_name,

805

1113

nonmethod_func.func_defaults,

806

1114

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

807

1121

# Define a creator of a function to call both the

808

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

809

# signals gets sent when the function is called

1122

# original and alternate functions, so both the

1123

# original and alternate signals gets sent when

1124

# the function is called

810

1125

def fixscope(func1, func2):

811

1126

"""This function is a scope container to pass

812

1127

func1 and func2 to the "call_both" function

819

1134

return call_both

820

1135

# Create the "call_both" function and add it to

821

1136

# the class

822

attr[attrname] = fixscope(attribute,

823

new_function)

1137

attr[attrname] = fixscope(attribute, new_function)

824

1138

# Is this a D-Bus method?

825

1139

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

826

1140

# Create a new, but exactly alike, function

837

1151

attribute.func_name,

838

1152

attribute.func_defaults,

839

1153

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

840

1160

# Is this a D-Bus property?

841

1161

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

842

1162

# Create a new, but exactly alike, function

856

1176

attribute.func_name,

857

1177

attribute.func_defaults,

858

1178

attribute.func_closure)))

859

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

860

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

1224

class ClientDBus(Client, DBusObjectWithProperties):

862

1225

"""A Client class using D-Bus

863

1226

869

1232

runtime_expansions = (Client.runtime_expansions

870

1233

+ ("dbus_object_path",))

871

1234

1235

_interface = "se.recompile.Mandos.Client"

1236

872

1237

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

873

1238

874

1239

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

875

self._approvals_pending = 0

876

1240

self.bus = bus

877

1241

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

878

1242

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

879

1243

# the D-Bus

880

client_object_name = unicode(self.name).translate(

1244

client_object_name = str(self.name).translate(

881

1245

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

882

1246

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

883

1247

self.dbus_object_path = (dbus.ObjectPath

884

1248

("/clients/" + client_object_name))

885

1249

DBusObjectWithProperties.__init__(self, self.bus,

886

1250

self.dbus_object_path)

887

1251

888

1252

def notifychangeproperty(transform_func,

889

1253

dbus_name, type_func=lambda x: x,

890

variant_level=1):

1254

variant_level=1, invalidate_only=False,

1255

_interface=_interface):

891

1256

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

892

1257

its changes to DBus.

893

1258

894

1259

transform_fun: Function that takes a value and a variant_level

895

1260

and transforms it to a D-Bus type.

896

1261

dbus_name: D-Bus name of the variable

898

1263

to the D-Bus. Default: no transform

899

1264

variant_level: D-Bus variant level. Default: 1

900

1265

"""

901

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

1266

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

902

1267

def setter(self, value):

903

1268

if hasattr(self, "dbus_object_path"):

904

1269

if (not hasattr(self, attrname) or

905

1270

type_func(getattr(self, attrname, None))

906

1271

!= type_func(value)):

907

dbus_value = transform_func(type_func(value),

908

variant_level

909

=variant_level)

910

self.PropertyChanged(dbus.String(dbus_name),

911

dbus_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())

912

1287

setattr(self, attrname, value)

913

1288

914

1289

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

915

1290

916

917

1291

expires = notifychangeproperty(datetime_to_dbus, "Expires")

918

1292

approvals_pending = notifychangeproperty(dbus.Boolean,

919

1293

"ApprovalPending",

926

1300

checker is not None)

927

1301

last_checked_ok = notifychangeproperty(datetime_to_dbus,

928

1302

"LastCheckedOK")

1303

last_checker_status = notifychangeproperty(dbus.Int16,

1304

"LastCheckerStatus")

929

1305

last_approval_request = notifychangeproperty(

930

1306

datetime_to_dbus, "LastApprovalRequest")

931

1307

approved_by_default = notifychangeproperty(dbus.Boolean,

932

1308

"ApprovedByDefault")

933

approval_delay = notifychangeproperty(dbus.UInt16,

1309

approval_delay = notifychangeproperty(dbus.UInt64,

934

1310

"ApprovalDelay",

935

1311

type_func =

936

_timedelta_to_milliseconds)

1312

lambda td: td.total_seconds()

1313

* 1000)

937

1314

approval_duration = notifychangeproperty(

938

dbus.UInt16, "ApprovalDuration",

939

type_func = _timedelta_to_milliseconds)

1315

dbus.UInt64, "ApprovalDuration",

1316

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

940

1317

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

941

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

942

type_func =

943

_timedelta_to_milliseconds)

1318

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

1319

type_func = lambda td:

1320

td.total_seconds() * 1000)

944

1321

extended_timeout = notifychangeproperty(

945

dbus.UInt16, "ExtendedTimeout",

946

type_func = _timedelta_to_milliseconds)

947

interval = notifychangeproperty(dbus.UInt16,

1322

dbus.UInt64, "ExtendedTimeout",

1323

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

1324

interval = notifychangeproperty(dbus.UInt64,

948

1325

"Interval",

949

1326

type_func =

950

_timedelta_to_milliseconds)

1327

lambda td: td.total_seconds()

1328

* 1000)

951

1329

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

1330

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

1331

invalidate_only=True)

952

1332

953

1333

del notifychangeproperty

954

1334

981

1361

*args, **kwargs)

982

1362

983

1363

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

984

old_checker = self.checker

985

if self.checker is not None:

986

old_checker_pid = self.checker.pid

987

else:

988

old_checker_pid = None

1364

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

989

1365

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

990

1366

# Only if new checker process was started

991

1367

if (self.checker is not None

995

1371

return r

996

1372

997

1373

def _reset_approved(self):

998

self._approved = None

1374

self.approved = None

999

1375

return False

1000

1376

1001

1377

def approve(self, value=True):

1378

self.approved = value

1379

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

1380

* 1000), self._reset_approved)

1002

1381

self.send_changedstate()

1003

self._approved = value

1004

gobject.timeout_add(_timedelta_to_milliseconds

1005

(self.approval_duration),

1006

self._reset_approved)

1007

1008

1382

1009

1383

## D-Bus methods, signals & properties

1010

_interface = "se.recompile.Mandos.Client"

1384

1385

## Interfaces

1011

1386

1012

1387

## Signals

1013

1388

1024

1399

pass

1025

1400

1026

1401

# PropertyChanged - signal

1402

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

1027

1403

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

1028

1404

def PropertyChanged(self, property, value):

1029

1405

"D-Bus signal"

1105

1481

access="readwrite")

1106

1482

def ApprovalDelay_dbus_property(self, value=None):

1107

1483

if value is None: # get

1108

return dbus.UInt64(self.approval_delay_milliseconds())

1484

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

1485

* 1000)

1109

1486

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

1110

1487

1111

1488

# ApprovalDuration - property

1113

1490

access="readwrite")

1114

1491

def ApprovalDuration_dbus_property(self, value=None):

1115

1492

if value is None: # get

1116

return dbus.UInt64(_timedelta_to_milliseconds(

1117

self.approval_duration))

1493

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

1494

* 1000)

1118

1495

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

1119

1496

1120

1497

# Name - property

1133

1510

def Host_dbus_property(self, value=None):

1134

1511

if value is None: # get

1135

1512

return dbus.String(self.host)

1136

self.host = value

1513

self.host = str(value)

1137

1514

1138

1515

# Created - property

1139

1516

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

1140

1517

def Created_dbus_property(self):

1141

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

1518

return datetime_to_dbus(self.created)

1142

1519

1143

1520

# LastEnabled - property

1144

1521

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

1165

1542

return

1166

1543

return datetime_to_dbus(self.last_checked_ok)

1167

1544

1545

# LastCheckerStatus - property

1546

@dbus_service_property(_interface, signature="n",

1547

access="read")

1548

def LastCheckerStatus_dbus_property(self):

1549

return dbus.Int16(self.last_checker_status)

1550

1168

1551

# Expires - property

1169

1552

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

1170

1553

def Expires_dbus_property(self):

1180

1563

access="readwrite")

1181

1564

def Timeout_dbus_property(self, value=None):

1182

1565

if value is None: # get

1183

return dbus.UInt64(self.timeout_milliseconds())

1566

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

1567

old_timeout = self.timeout

1184

1568

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

1185

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

1186

return

1187

# Reschedule timeout

1188

gobject.source_remove(self.disable_initiator_tag)

1189

self.disable_initiator_tag = None

1190

self.expires = None

1191

time_to_die = _timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow())

1196

if time_to_die <= 0:

1197

# The timeout has passed

1198

self.disable()

1199

else:

1200

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

1201

+ datetime.timedelta(milliseconds =

1202

time_to_die))

1203

self.disable_initiator_tag = (gobject.timeout_add

1204

(time_to_die, self.disable))

1569

# Reschedule disabling

1570

if self.enabled:

1571

now = datetime.datetime.utcnow()

1572

self.expires += self.timeout - old_timeout

1573

if self.expires <= now:

1574

# The timeout has passed

1575

self.disable()

1576

else:

1577

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

1578

is None):

1579

return

1580

gobject.source_remove(self.disable_initiator_tag)

1581

self.disable_initiator_tag = (

1582

gobject.timeout_add(

1583

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

1584

* 1000), self.disable))

1205

1585

1206

1586

# ExtendedTimeout - property

1207

1587

@dbus_service_property(_interface, signature="t",

1208

1588

access="readwrite")

1209

1589

def ExtendedTimeout_dbus_property(self, value=None):

1210

1590

if value is None: # get

1211

return dbus.UInt64(self.extended_timeout_milliseconds())

1591

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

1592

* 1000)

1212

1593

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

1213

1594

1214

1595

# Interval - property

1216

1597

access="readwrite")

1217

1598

def Interval_dbus_property(self, value=None):

1218

1599

if value is None: # get

1219

return dbus.UInt64(self.interval_milliseconds())

1600

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

1220

1601

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

1221

1602

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

1222

1603

return

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

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

1228

1610

1229

1611

# Checker - property

1230

1612

@dbus_service_property(_interface, signature="s",

1232

1614

def Checker_dbus_property(self, value=None):

1233

1615

if value is None: # get

1234

1616

return dbus.String(self.checker_command)

1235

self.checker_command = value

1617

self.checker_command = str(value)

1236

1618

1237

1619

# CheckerRunning - property

1238

1620

@dbus_service_property(_interface, signature="b",

1254

1636

@dbus_service_property(_interface, signature="ay",

1255

1637

access="write", byte_arrays=True)

1256

1638

def Secret_dbus_property(self, value):

1257

self.secret = str(value)

1639

self.secret = bytes(value)

1258

1640

1259

1641

del _interface

1260

1642

1267

1649

raise KeyError()

1268

1650

1269

1651

def __getattribute__(self, name):

1270

if(name == '_pipe'):

1652

if name == '_pipe':

1271

1653

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

1272

1654

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

1273

1655

data = self._pipe.recv()

1280

1662

return func

1281

1663

1282

1664

def __setattr__(self, name, value):

1283

if(name == '_pipe'):

1665

if name == '_pipe':

1284

1666

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

1285

1667

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

1286

1668

1287

class ClientDBusTransitional(ClientDBus):

1288

__metaclass__ = AlternateDBusNamesMetaclass

1289

1669

1290

1670

class ClientHandler(socketserver.BaseRequestHandler, object):

1291

1671

"""A class to handle client connections.

1296

1676

def handle(self):

1297

1677

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

1298

1678

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

1299

unicode(self.client_address))

1679

str(self.client_address))

1300

1680

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

1301

1681

self.server.child_pipe.fileno())

1302

1682

1328

1708

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

1329

1709

try:

1330

1710

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

1331

raise RuntimeError

1711

raise RuntimeError(line)

1332

1712

except (ValueError, IndexError, RuntimeError) as error:

1333

1713

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

1334

1714

return

1374

1754

client.Rejected("Disabled")

1375

1755

return

1376

1756

1377

if client._approved or not client.approval_delay:

1757

if client.approved or not client.approval_delay:

1378

1758

#We are approved or approval is disabled

1379

1759

break

1380

elif client._approved is None:

1760

elif client.approved is None:

1381

1761

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

1382

1762

client.name)

1383

1763

if self.server.use_dbus:

1384

1764

# Emit D-Bus signal

1385

1765

client.NeedApproval(

1386

client.approval_delay_milliseconds(),

1387

client.approved_by_default)

1766

client.approval_delay.total_seconds()

1767

* 1000, client.approved_by_default)

1388

1768

else:

1389

1769

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

1390

1770

client.name)

1396

1776

#wait until timeout or approved

1397

1777

time = datetime.datetime.now()

1398

1778

client.changedstate.acquire()

1399

(client.changedstate.wait

1400

(float(client._timedelta_to_milliseconds(delay)

1401

/ 1000)))

1779

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

1402

1780

client.changedstate.release()

1403

1781

time2 = datetime.datetime.now()

1404

1782

if (time2 - time) >= delay:

1420

1798

try:

1421

1799

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

1422

1800

except gnutls.errors.GNUTLSError as error:

1423

logger.warning("gnutls send failed")

1801

logger.warning("gnutls send failed",

1802

exc_info=error)

1424

1803

return

1425

1804

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

1426

1805

sent, len(client.secret)

1429

1808

1430

1809

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

1431

1810

# bump the timeout using extended_timeout

1432

client.checked_ok(client.extended_timeout)

1811

client.bump_timeout(client.extended_timeout)

1433

1812

if self.server.use_dbus:

1434

1813

# Emit D-Bus signal

1435

1814

client.GotSecret()

1440

1819

try:

1441

1820

session.bye()

1442

1821

except gnutls.errors.GNUTLSError as error:

1443

logger.warning("GnuTLS bye failed")

1822

logger.warning("GnuTLS bye failed",

1823

exc_info=error)

1444

1824

1445

1825

@staticmethod

1446

1826

def peer_certificate(session):

1502

1882

# Convert the buffer to a Python bytestring

1503

1883

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

1504

1884

# Convert the bytestring to hexadecimal notation

1505

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

1885

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

1506

1886

return hex_fpr

1507

1887

1508

1888

1511

1891

def sub_process_main(self, request, address):

1512

1892

try:

1513

1893

self.finish_request(request, address)

1514

except:

1894

except Exception:

1515

1895

self.handle_error(request, address)

1516

1896

self.close_request(request)

1517

1897

1518

1898

def process_request(self, request, address):

1519

1899

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

1520

1900

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

1521

args = (request,

1522

address))

1901

args = (request, address))

1523

1902

proc.start()

1524

1903

return proc

1525

1904

1540

1919

1541

1920

def add_pipe(self, parent_pipe, proc):

1542

1921

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

1543

raise NotImplementedError

1922

raise NotImplementedError()

1544

1923

1545

1924

1546

1925

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1553

1932

use_ipv6: Boolean; to use IPv6 or not

1554

1933

"""

1555

1934

def __init__(self, server_address, RequestHandlerClass,

1556

interface=None, use_ipv6=True):

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

"""

1557

1939

self.interface = interface

1558

1940

if use_ipv6:

1559

1941

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.

1560

1968

socketserver.TCPServer.__init__(self, server_address,

1561

1969

RequestHandlerClass)

1970

1562

1971

def server_bind(self):

1563

1972

"""This overrides the normal server_bind() function

1564

1973

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

1572

1981

try:

1573

1982

self.socket.setsockopt(socket.SOL_SOCKET,

1574

1983

SO_BINDTODEVICE,

1575

str(self.interface

1576

+ '\0'))

1984

(self.interface + "\0")

1985

.encode("utf-8"))

1577

1986

except socket.error as error:

1578

if error[0] == errno.EPERM:

1579

logger.error("No permission to"

1580

" bind to interface %s",

1581

self.interface)

1582

elif error[0] == errno.ENOPROTOOPT:

1987

if error.errno == errno.EPERM:

1988

logger.error("No permission to bind to"

1989

" interface %s", self.interface)

1990

elif error.errno == errno.ENOPROTOOPT:

1583

1991

logger.error("SO_BINDTODEVICE not available;"

1584

1992

" cannot bind to interface %s",

1585

1993

self.interface)

1994

elif error.errno == errno.ENODEV:

1995

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

1996

" cannot bind", self.interface)

1586

1997

else:

1587

1998

raise

1588

1999

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

1591

2002

if self.address_family == socket.AF_INET6:

1592

2003

any_address = "::" # in6addr_any

1593

2004

else:

1594

any_address = socket.INADDR_ANY

2005

any_address = "0.0.0.0" # INADDR_ANY

1595

2006

self.server_address = (any_address,

1596

2007

self.server_address[1])

1597

2008

elif not self.server_address[1]:

1618

2029

"""

1619

2030

def __init__(self, server_address, RequestHandlerClass,

1620

2031

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

1621

gnutls_priority=None, use_dbus=True):

2032

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

1622

2033

self.enabled = False

1623

2034

self.clients = clients

1624

2035

if self.clients is None:

1625

self.clients = set()

2036

self.clients = {}

1626

2037

self.use_dbus = use_dbus

1627

2038

self.gnutls_priority = gnutls_priority

1628

2039

IPv6_TCPServer.__init__(self, server_address,

1629

2040

RequestHandlerClass,

1630

2041

interface = interface,

1631

use_ipv6 = use_ipv6)

2042

use_ipv6 = use_ipv6,

2043

socketfd = socketfd)

1632

2044

def server_activate(self):

1633

2045

if self.enabled:

1634

2046

return socketserver.TCPServer.server_activate(self)

1647

2059

1648

2060

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

1649

2061

proc = None, client_object=None):

1650

condition_names = {

1651

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

1652

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

1653

# blocking).

1654

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

1655

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

1656

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

1657

# broken, usually for pipes and

1658

# sockets).

1659

}

1660

conditions_string = ' | '.join(name

1661

for cond, name in

1662

condition_names.iteritems()

1663

if cond & condition)

1664

2062

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

1665

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

2063

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

1666

2064

# Wait for other process to exit

1667

2065

proc.join()

1668

2066

return False

1675

2073

fpr = request[1]

1676

2074

address = request[2]

1677

2075

1678

for c in self.clients:

2076

for c in self.clients.itervalues():

1679

2077

if c.fingerprint == fpr:

1680

2078

client = c

1681

2079

break

1726

2124

return True

1727

2125

1728

2126

2127

def rfc3339_duration_to_delta(duration):

2128

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

2129

2130

>>> rfc3339_duration_to_delta("P7D")

2131

datetime.timedelta(7)

2132

>>> rfc3339_duration_to_delta("PT60S")

2133

datetime.timedelta(0, 60)

2134

>>> rfc3339_duration_to_delta("PT60M")

2135

datetime.timedelta(0, 3600)

2136

>>> rfc3339_duration_to_delta("PT24H")

2137

datetime.timedelta(1)

2138

>>> rfc3339_duration_to_delta("P1W")

2139

datetime.timedelta(7)

2140

>>> rfc3339_duration_to_delta("PT5M30S")

2141

datetime.timedelta(0, 330)

2142

>>> rfc3339_duration_to_delta("P1DT3M20S")

2143

datetime.timedelta(1, 200)

2144

"""

2145

2146

# Parsing an RFC 3339 duration with regular expressions is not

2147

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

2148

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

2149

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

2150

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

2151

# avoid excessive use of external libraries.

2152

2153

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

2154

Token = collections.namedtuple("Token",

2155

("regexp", # To match token; if

2156

# "value" is not None,

2157

# must have a "group"

2158

# containing digits

2159

"value", # datetime.timedelta or

2160

# None

2161

"followers")) # Tokens valid after

2162

# this token

2163

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

2164

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

2165

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

2166

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

2167

datetime.timedelta(seconds=1),

2168

frozenset((token_end,)))

2169

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

2170

datetime.timedelta(minutes=1),

2171

frozenset((token_second, token_end)))

2172

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

2173

datetime.timedelta(hours=1),

2174

frozenset((token_minute, token_end)))

2175

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

2176

None,

2177

frozenset((token_hour, token_minute,

2178

token_second)))

2179

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

2180

datetime.timedelta(days=1),

2181

frozenset((token_time, token_end)))

2182

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

2183

datetime.timedelta(weeks=4),

2184

frozenset((token_day, token_end)))

2185

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

2186

datetime.timedelta(weeks=52),

2187

frozenset((token_month, token_end)))

2188

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

2189

datetime.timedelta(weeks=1),

2190

frozenset((token_end,)))

2191

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

2192

frozenset((token_year, token_month,

2193

token_day, token_time,

2194

token_week)))

2195

# Define starting values

2196

value = datetime.timedelta() # Value so far

2197

found_token = None

2198

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

2199

s = duration # String left to parse

2200

# Loop until end token is found

2201

while found_token is not token_end:

2202

# Search for any currently valid tokens

2203

for token in followers:

2204

match = token.regexp.match(s)

2205

if match is not None:

2206

# Token found

2207

if token.value is not None:

2208

# Value found, parse digits

2209

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

2210

# Add to value so far

2211

value += factor * token.value

2212

# Strip token from string

2213

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

2214

# Go to found token

2215

found_token = token

2216

# Set valid next tokens

2217

followers = found_token.followers

2218

break

2219

else:

2220

# No currently valid tokens were found

2221

raise ValueError("Invalid RFC 3339 duration")

2222

# End token found

2223

return value

2224

2225

1729

2226

def string_to_delta(interval):

1730

2227

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

1731

2228

1742

2239

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

1743

2240

datetime.timedelta(0, 330)

1744

2241

"""

2242

2243

try:

2244

return rfc3339_duration_to_delta(interval)

2245

except ValueError:

2246

pass

2247

1745

2248

timevalue = datetime.timedelta(0)

1746

2249

for s in interval.split():

1747

2250

try:

1748

suffix = unicode(s[-1])

2251

suffix = s[-1]

1749

2252

value = int(s[:-1])

1750

2253

if suffix == "d":

1751

2254

delta = datetime.timedelta(value)

1758

2261

elif suffix == "w":

1759

2262

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

1760

2263

else:

1761

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

1762

except (ValueError, IndexError) as e:

2264

raise ValueError("Unknown suffix {!r}"

2265

.format(suffix))

2266

except IndexError as e:

1763

2267

raise ValueError(*(e.args))

1764

2268

timevalue += delta

1765

2269

return timevalue

1766

2270

1767

2271

1768

def if_nametoindex(interface):

1769

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

1770

1771

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

1772

global if_nametoindex

1773

try:

1774

if_nametoindex = (ctypes.cdll.LoadLibrary

1775

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

1776

.if_nametoindex)

1777

except (OSError, AttributeError):

1778

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

1779

def if_nametoindex(interface):

1780

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

1781

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

1782

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

1783

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1784

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

1785

interface))

1786

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

1787

ifreq[16:20])[0]

1788

return interface_index

1789

return if_nametoindex(interface)

1790

1791

1792

2272

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

1793

2273

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

1794

2274

1802

2282

sys.exit()

1803

2283

if not noclose:

1804

2284

# Close all standard open file descriptors

1805

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

2285

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

1806

2286

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

1807

raise OSError(errno.ENODEV,

1808

"%s not a character device"

1809

% os.path.devnull)

2287

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

2288

.format(os.devnull))

1810

2289

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

1811

2290

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

1812

2291

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

1821

2300

1822

2301

parser = argparse.ArgumentParser()

1823

2302

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

1824

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

2303

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

1825

2304

help="show version number and exit")

1826

2305

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

1827

2306

help="Bind to interface IF")

1833

2312

help="Run self-test")

1834

2313

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

1835

2314

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

1836

" to terminal")

2315

" to terminal", default=None)

1837

2316

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

1838

2317

help="Debug level for stdout output")

1839

2318

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

1846

2325

" files")

1847

2326

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

1848

2327

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

1849

" system bus interface")

2328

" system bus interface", default=None)

1850

2329

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

1851

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

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

1852

2346

options = parser.parse_args()

1853

2347

1854

2348

if options.check:

1855

2349

import doctest

1856

doctest.testmod()

1857

sys.exit()

2350

fail_count, test_count = doctest.testmod()

2351

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

1858

2352

1859

2353

# Default values for config file for server-global settings

1860

2354

server_defaults = { "interface": "",

1862

2356

"port": "",

1863

2357

"debug": "False",

1864

2358

"priority":

1865

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

2359

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

1866

2360

"servicename": "Mandos",

1867

2361

"use_dbus": "True",

1868

2362

"use_ipv6": "True",

1869

2363

"debuglevel": "",

2364

"restore": "True",

2365

"socket": "",

2366

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

2367

"foreground": "False",

2368

"zeroconf": "True",

1870

2369

}

1871

2370

1872

2371

# Parse config file for server-global settings

1877

2376

# Convert the SafeConfigParser object to a dict

1878

2377

server_settings = server_config.defaults()

1879

2378

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

1880

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

2379

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

1881

2380

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

1882

2381

option)

1883

2382

if server_settings["port"]:

1884

2383

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

1885

2384

"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"])

1886

2394

del server_config

1887

2395

1888

2396

# Override the settings from the config file with command line

1889

2397

# options, if set.

1890

2398

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

1891

2399

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

1892

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

2400

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

2401

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

1893

2402

value = getattr(options, option)

1894

2403

if value is not None:

1895

2404

server_settings[option] = value

1896

2405

del options

1897

2406

# Force all strings to be unicode

1898

2407

for option in server_settings.keys():

1899

if type(server_settings[option]) is str:

1900

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

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

2418

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

1902

2419

1903

2420

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

1904

2421

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

1905

2428

# For convenience

1906

2429

debug = server_settings["debug"]

1907

2430

debuglevel = server_settings["debuglevel"]

1908

2431

use_dbus = server_settings["use_dbus"]

1909

2432

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)

1910

2446

1911

2447

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

1912

2448

syslogger.setFormatter(logging.Formatter

1913

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

1914

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

1915

% server_settings["servicename"]))

2449

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

2450

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

2451

.format(server_settings

2452

["servicename"])))

1916

2453

1917

2454

# Parse config file with clients

1918

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

1919

"extended_timeout": "15m",

1920

"interval": "2m",

1921

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

1922

"host": "",

1923

"approval_delay": "0s",

1924

"approval_duration": "1s",

1925

}

1926

client_config = configparser.SafeConfigParser(client_defaults)

2455

client_config = configparser.SafeConfigParser(Client

2456

.client_defaults)

1927

2457

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

1928

2458

"clients.conf"))

1929

2459

1930

2460

global mandos_dbus_service

1931

2461

mandos_dbus_service = None

1932

2462

2463

socketfd = None

2464

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

2465

socketfd = server_settings["socket"]

1933

2466

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

1934

2467

server_settings["port"]),

1935

2468

ClientHandler,

1938

2471

use_ipv6=use_ipv6,

1939

2472

gnutls_priority=

1940

2473

server_settings["priority"],

1941

use_dbus=use_dbus)

1942

if not debug:

1943

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

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

1944

2481

try:

1945

2482

pidfile = open(pidfilename, "w")

1946

except IOError:

1947

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

2483

except IOError as e:

2484

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

2485

exc_info=e)

1948

2486

1949

try:

1950

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

1951

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

1952

except KeyError:

2487

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

1953

2488

try:

1954

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

1955

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

2489

uid = pwd.getpwnam(name).pw_uid

2490

gid = pwd.getpwnam(name).pw_gid

2491

break

1956

2492

except KeyError:

1957

try:

1958

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

1959

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

1960

except KeyError:

1961

uid = 65534

1962

gid = 65534

2493

continue

2494

else:

2495

uid = 65534

2496

gid = 65534

1963

2497

try:

1964

2498

os.setgid(gid)

1965

2499

os.setuid(uid)

1966

2500

except OSError as error:

1967

if error[0] != errno.EPERM:

1968

raise error

1969

1970

if not debug and not debuglevel:

1971

syslogger.setLevel(logging.WARNING)

1972

console.setLevel(logging.WARNING)

1973

if debuglevel:

1974

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

1975

syslogger.setLevel(level)

1976

console.setLevel(level)

2501

if error.errno != errno.EPERM:

2502

raise

1977

2503

1978

2504

if debug:

1979

2505

# Enable all possible GnuTLS debugging

1990

2516

.gnutls_global_set_log_function(debug_gnutls))

1991

2517

1992

2518

# Redirect stdin so all checkers get /dev/null

1993

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

2519

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

1994

2520

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

1995

2521

if null > 2:

1996

2522

os.close(null)

1997

else:

1998

# No console logging

1999

logger.removeHandler(console)

2000

2523

2001

2524

# Need to fork before connecting to D-Bus

2002

if not debug:

2525

if not foreground:

2003

2526

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

2004

2527

daemon()

2005

2528

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

2006

2533

global main_loop

2007

2534

# From the Avahi example code

2008

DBusGMainLoop(set_as_default=True )

2535

DBusGMainLoop(set_as_default=True)

2009

2536

main_loop = gobject.MainLoop()

2010

2537

bus = dbus.SystemBus()

2011

2538

# End of Avahi example code

2017

2544

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

2018

2545

do_not_queue=True))

2019

2546

except dbus.exceptions.NameExistsException as e:

2020

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

2547

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

2021

2548

use_dbus = False

2022

2549

server_settings["use_dbus"] = False

2023

2550

tcp_server.use_dbus = False

2024

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2025

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

2026

servicetype = "_mandos._tcp",

2027

protocol = protocol, bus = bus)

2028

if server_settings["interface"]:

2029

service.interface = (if_nametoindex

2030

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

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")))

2031

2561

2032

2562

global multiprocessing_manager

2033

2563

multiprocessing_manager = multiprocessing.Manager()

2034

2564

2035

2565

client_class = Client

2036

2566

if use_dbus:

2037

client_class = functools.partial(ClientDBusTransitional,

2038

bus = bus)

2039

def client_config_items(config, section):

2040

special_settings = {

2041

"approved_by_default":

2042

lambda: config.getboolean(section,

2043

"approved_by_default"),

2044

}

2045

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

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))

2046

2650

try:

2047

yield (name, special_settings[name]())

2048

except KeyError:

2049

yield (name, value)

2050

2051

tcp_server.clients.update(set(

2052

client_class(name = section,

2053

config= dict(client_config_items(

2054

client_config, section)))

2055

for section in client_config.sections()))

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

2056

2676

if not tcp_server.clients:

2057

2677

logger.warning("No clients defined")

2058

2059

if not debug:

2060

try:

2061

with pidfile:

2062

pid = os.getpid()

2063

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

2064

del pidfile

2065

except IOError:

2066

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

2067

pidfilename, pid)

2068

except NameError:

2069

# "pidfile" was never created

2070

pass

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

2071

2689

del pidfilename

2072

2073

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

2074

2690

2075

2691

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

2076

2692

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

2077

2693

2078

2694

if use_dbus:

2079

class MandosDBusService(dbus.service.Object):

2695

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

2696

"se.bsnet.fukt.Mandos"})

2697

class MandosDBusService(DBusObjectWithProperties):

2080

2698

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

2081

2699

def __init__(self):

2082

2700

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

2083

2701

_interface = "se.recompile.Mandos"

2084

2702

2703

@dbus_interface_annotations(_interface)

2704

def _foo(self):

2705

return { "org.freedesktop.DBus.Property"

2706

".EmitsChangedSignal":

2707

"false"}

2708

2085

2709

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

2086

2710

def ClientAdded(self, objpath):

2087

2711

"D-Bus signal"

2101

2725

def GetAllClients(self):

2102

2726

"D-Bus method"

2103

2727

return dbus.Array(c.dbus_object_path

2104

for c in tcp_server.clients)

2728

for c in

2729

tcp_server.clients.itervalues())

2105

2730

2106

2731

@dbus.service.method(_interface,

2107

2732

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

2108

2733

def GetAllClientsWithProperties(self):

2109

2734

"D-Bus method"

2110

2735

return dbus.Dictionary(

2111

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

2112

for c in tcp_server.clients),

2736

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

2737

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

2113

2738

signature="oa{sv}")

2114

2739

2115

2740

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

2116

2741

def RemoveClient(self, object_path):

2117

2742

"D-Bus method"

2118

for c in tcp_server.clients:

2743

for c in tcp_server.clients.itervalues():

2119

2744

if c.dbus_object_path == object_path:

2120

tcp_server.clients.remove(c)

2745

del tcp_server.clients[c.name]

2121

2746

c.remove_from_connection()

2122

2747

# Don't signal anything except ClientRemoved

2123

2748

c.disable(quiet=True)

2128

2753

2129

2754

del _interface

2130

2755

2131

class MandosDBusServiceTransitional(MandosDBusService):

2132

__metaclass__ = AlternateDBusNamesMetaclass

2133

mandos_dbus_service = MandosDBusServiceTransitional()

2756

mandos_dbus_service = MandosDBusService()

2134

2757

2135

2758

def cleanup():

2136

2759

"Cleanup function; run on exit"

2137

service.cleanup()

2760

if zeroconf:

2761

service.cleanup()

2138

2762

2139

2763

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

2140

2819

while tcp_server.clients:

2141

client = tcp_server.clients.pop()

2820

name, client = tcp_server.clients.popitem()

2142

2821

if use_dbus:

2143

2822

client.remove_from_connection()

2144

client.disable_hook = None

2145

2823

# Don't signal anything except ClientRemoved

2146

2824

client.disable(quiet=True)

2147

2825

if use_dbus:

2149

2827

mandos_dbus_service.ClientRemoved(client

2150

2828

.dbus_object_path,

2151

2829

client.name)

2830

client_settings.clear()

2152

2831

2153

2832

atexit.register(cleanup)

2154

2833

2155

for client in tcp_server.clients:

2834

for client in tcp_server.clients.itervalues():

2156

2835

if use_dbus:

2157

2836

# Emit D-Bus signal

2158

2837

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2159

client.enable()

2838

# Need to initiate checking of clients

2839

if client.enabled:

2840

client.init_checker()

2160

2841

2161

2842

tcp_server.enable()

2162

2843

tcp_server.server_activate()

2163

2844

2164

2845

# Find out what port we got

2165

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

2846

if zeroconf:

2847

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

2166

2848

if use_ipv6:

2167

2849

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

2168

" flowinfo %d, scope_id %d"

2169

% tcp_server.socket.getsockname())

2850

" flowinfo %d, scope_id %d",

2851

*tcp_server.socket.getsockname())

2170

2852

else: # IPv4

2171

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

2172

% tcp_server.socket.getsockname())

2853

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

2854

*tcp_server.socket.getsockname())

2173

2855

2174

2856

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

2175

2857

2176

2858

try:

2177

# From the Avahi example code

2178

try:

2179

service.activate()

2180

except dbus.exceptions.DBusException as error:

2181

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

2182

cleanup()

2183

sys.exit(1)

2184

# End of Avahi example code

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

2185

2868

2186

2869

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

2187

2870

lambda *args, **kwargs:

2191

2874

logger.debug("Starting main loop")

2192

2875

main_loop.run()

2193

2876

except AvahiError as error:

2194

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

2877

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

2195

2878

cleanup()

2196

2879

sys.exit(1)

2197

2880

except KeyboardInterrupt:

2202

2885

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

2203

2886

cleanup()

2204

2887

2205

2206

2888

if __name__ == '__main__':

2207

2889

main()