/mandos/release : revision 237.7.292

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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 = "1.4.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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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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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the

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# fingerprint() function

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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

345

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

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.replace(" ", ""))

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

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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()

557

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),

561

lambda obj:

562

isinstance(obj,

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property)):

564

if not name.startswith("_"):

565

self.client_structure.append(name)

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# Send notice to process children that client state has changed

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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"""

396

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

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# Already enabled

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return

399

self.send_changedstate()

400

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

401

# and every interval from then on.

402

self.checker_initiator_tag = (gobject.timeout_add

403

(self.interval_milliseconds(),

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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

407

self.disable_initiator_tag = (gobject.timeout_add

408

(self.timeout_milliseconds(),

409

self.disable))

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

412

# Also start a new checker *right now*.

413

self.start_checker()

580

self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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584

"""Disable this client."""

417

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

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return False

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if not quiet:

420

self.send_changedstate()

421

if not quiet:

422

588

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

653

if self.disable_initiator_tag is not None:

468

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

469

656

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

470

657

self.disable_initiator_tag = (gobject.timeout_add

471

(_timedelta_to_milliseconds

472

(timeout), self.disable))

658

(int(timeout.total_seconds()

659

* 1000), self.disable))

473

660

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

474

661

475

662

def need_approval(self):

481

668

If a checker already exists, leave it running and do

482

669

nothing."""

483

670

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

484

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

485

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

486

# client would inevitably timeout, since no checker would get

487

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

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

488

675

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

489

676

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

490

677

# should be.

492

679

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

493

680

try:

494

681

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

495

except (AttributeError, OSError) as error:

496

if (isinstance(error, OSError)

497

and error.errno != errno.ECHILD):

498

raise error

682

except AttributeError:

683

pass

684

except OSError as error:

685

if error.errno != errno.ECHILD:

686

raise

499

687

else:

500

688

if pid:

501

689

logger.warning("Checker was a zombie")

504

692

self.current_checker_command)

505

693

# Start a new checker if needed

506

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 }

507

699

try:

508

# In case checker_command has exactly one % operator

509

command = self.checker_command % self.host

510

except TypeError:

511

# Escape attributes for the shell

512

escaped_attrs = dict(

513

(attr,

514

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

515

errors=

516

'replace')))

517

for attr in

518

self.runtime_expansions)

519

520

try:

521

command = self.checker_command % escaped_attrs

522

except TypeError as error:

523

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

524

' %s', self.checker_command, error)

525

return True # Try again later

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

526

705

self.current_checker_command = command

527

706

try:

528

707

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

531

710

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

532

711

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

533

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 })

534

721

self.checker = subprocess.Popen(command,

535

722

close_fds=True,

536

shell=True, cwd="/")

537

self.checker_callback_tag = (gobject.child_watch_add

538

(self.checker.pid,

539

self.checker_callback,

540

data=command))

541

# The checker may have completed before the gobject

542

# watch was added. Check for this.

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:

543

736

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

544

if pid:

545

gobject.source_remove(self.checker_callback_tag)

546

self.checker_callback(pid, status, command)

547

737

except OSError as error:

548

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

549

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)

550

747

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

551

748

return True

552

749

559

756

return

560

757

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

561

758

try:

562

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

759

self.checker.terminate()

563

760

#time.sleep(0.5)

564

761

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

565

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

762

# self.checker.kill()

566

763

except OSError as error:

567

764

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

568

765

raise

585

782

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

586

783

if byte_arrays and signature != "ay":

587

784

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

588

" signature %r" % signature)

785

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

589

786

def decorator(func):

590

787

func._dbus_is_property = True

591

788

func._dbus_interface = dbus_interface

599

796

return decorator

600

797

601

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

602

836

class DBusPropertyException(dbus.exceptions.DBusException):

603

837

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

604

838

"""

605

def __unicode__(self):

606

return unicode(str(self))

607

839

pass

608

840

609

841

class DBusPropertyAccessException(DBusPropertyException):

610

842

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

627

859

"""

628

860

629

861

@staticmethod

630

def _is_dbus_property(obj):

631

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)

632

870

633

def _get_all_dbus_properties(self):

871

def _get_all_dbus_things(self, thing):

634

872

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

635

873

"""

636

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

874

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

875

name),

876

athing.__get__(self))

637

877

for cls in self.__class__.__mro__

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

878

for name, athing in

879

inspect.getmembers(cls,

880

self._is_dbus_thing(thing)))

640

881

641

882

def _get_dbus_property(self, interface_name, property_name):

642

883

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

644

885

"""

645

886

for cls in self.__class__.__mro__:

646

887

for name, value in (inspect.getmembers

647

(cls, self._is_dbus_property)):

888

(cls,

889

self._is_dbus_thing("property"))):

648

890

if (value._dbus_name == property_name

649

891

and value._dbus_interface == interface_name):

650

892

return value.__get__(self)

678

920

# The byte_arrays option is not supported yet on

679

921

# signatures other than "ay".

680

922

if prop._dbus_signature != "ay":

681

raise ValueError

682

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

683

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))

684

928

prop(value)

685

929

686

930

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

691

935

692

936

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

693

937

"""

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

938

properties = {}

939

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

696

940

if (interface_name

697

941

and interface_name != prop._dbus_interface):

698

942

# Interface non-empty but did not match

702

946

continue

703

947

value = prop()

704

948

if not hasattr(value, "variant_level"):

705

all[name] = value

949

properties[name] = value

706

950

continue

707

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

708

value.variant_level+1)

709

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

710

962

711

963

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

712

964

out_signature="s",

713

965

path_keyword='object_path',

714

966

connection_keyword='connection')

715

967

def Introspect(self, object_path, connection):

716

"""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.

717

971

"""

718

972

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

719

973

connection)

726

980

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

727

981

return e

728

982

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

983

# Add property tags

729

984

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

730

985

for name, prop

731

in self._get_all_dbus_properties()

986

in self._get_all_dbus_things("property")

732

987

if prop._dbus_interface

733

988

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

734

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)

735

1021

# Add the names to the return values for the

736

1022

# "org.freedesktop.DBus.Properties" methods

737

1023

if (if_tag.getAttribute("name")

752

1038

except (AttributeError, xml.dom.DOMException,

753

1039

xml.parsers.expat.ExpatError) as error:

754

1040

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

755

error)

1041

exc_info=error)

756

1042

return xmlstring

757

1043

758

1044

759

def datetime_to_dbus (dt, variant_level=0):

1045

def datetime_to_dbus(dt, variant_level=0):

760

1046

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

761

1047

if dt is None:

762

1048

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

763

1049

return dbus.String(dt.isoformat(),

764

1050

variant_level=variant_level)

765

1051

766

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

767

.__metaclass__):

768

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

769

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

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).

770

1075

"""

771

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

772

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

773

# methods, signals, or properties in them

774

for base in (b for b in bases

775

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

776

# Go though all attributes of the base class

777

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

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):

778

1083

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

779

1084

# with the wrong interface name

780

1085

if (not hasattr(attribute, "_dbus_interface")

781

1086

or not attribute._dbus_interface

782

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

1087

.startswith(orig_interface_name)):

783

1088

continue

784

1089

# Create an alternate D-Bus interface name based on

785

1090

# the current name

786

1091

alt_interface = (attribute._dbus_interface

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1092

.replace(orig_interface_name,

1093

alt_interface_name))

1094

interface_names.add(alt_interface)

789

1095

# Is this a D-Bus signal?

790

1096

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

791

# Extract the original non-method function by

792

# black magic

1097

# Extract the original non-method undecorated

1098

# function by black magic

793

1099

nonmethod_func = (dict(

794

1100

zip(attribute.func_code.co_freevars,

795

1101

attribute.__closure__))["func"]

806

1112

nonmethod_func.func_name,

807

1113

nonmethod_func.func_defaults,

808

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

809

1121

# Define a creator of a function to call both the

810

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

811

# 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

812

1125

def fixscope(func1, func2):

813

1126

"""This function is a scope container to pass

814

1127

func1 and func2 to the "call_both" function

821

1134

return call_both

822

1135

# Create the "call_both" function and add it to

823

1136

# the class

824

attr[attrname] = fixscope(attribute,

825

new_function)

1137

attr[attrname] = fixscope(attribute, new_function)

826

1138

# Is this a D-Bus method?

827

1139

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

828

1140

# Create a new, but exactly alike, function

839

1151

attribute.func_name,

840

1152

attribute.func_defaults,

841

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

842

1160

# Is this a D-Bus property?

843

1161

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

844

1162

# Create a new, but exactly alike, function

858

1176

attribute.func_name,

859

1177

attribute.func_defaults,

860

1178

attribute.func_closure)))

861

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

862

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"})

863

1224

class ClientDBus(Client, DBusObjectWithProperties):

864

1225

"""A Client class using D-Bus

865

1226

871

1232

runtime_expansions = (Client.runtime_expansions

872

1233

+ ("dbus_object_path",))

873

1234

1235

_interface = "se.recompile.Mandos.Client"

1236

874

1237

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

875

1238

876

1239

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

877

self._approvals_pending = 0

878

1240

self.bus = bus

879

1241

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

880

1242

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

881

1243

# the D-Bus

882

client_object_name = unicode(self.name).translate(

1244

client_object_name = str(self.name).translate(

883

1245

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

884

1246

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

885

1247

self.dbus_object_path = (dbus.ObjectPath

886

1248

("/clients/" + client_object_name))

887

1249

DBusObjectWithProperties.__init__(self, self.bus,

888

1250

self.dbus_object_path)

889

1251

890

1252

def notifychangeproperty(transform_func,

891

1253

dbus_name, type_func=lambda x: x,

892

variant_level=1):

1254

variant_level=1, invalidate_only=False,

1255

_interface=_interface):

893

1256

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

894

1257

its changes to DBus.

895

1258

896

1259

transform_fun: Function that takes a value and a variant_level

897

1260

and transforms it to a D-Bus type.

898

1261

dbus_name: D-Bus name of the variable

900

1263

to the D-Bus. Default: no transform

901

1264

variant_level: D-Bus variant level. Default: 1

902

1265

"""

903

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

1266

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

904

1267

def setter(self, value):

905

1268

if hasattr(self, "dbus_object_path"):

906

1269

if (not hasattr(self, attrname) or

907

1270

type_func(getattr(self, attrname, None))

908

1271

!= type_func(value)):

909

dbus_value = transform_func(type_func(value),

910

variant_level

911

=variant_level)

912

self.PropertyChanged(dbus.String(dbus_name),

913

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())

914

1287

setattr(self, attrname, value)

915

1288

916

1289

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

917

1290

918

919

1291

expires = notifychangeproperty(datetime_to_dbus, "Expires")

920

1292

approvals_pending = notifychangeproperty(dbus.Boolean,

921

1293

"ApprovalPending",

928

1300

checker is not None)

929

1301

last_checked_ok = notifychangeproperty(datetime_to_dbus,

930

1302

"LastCheckedOK")

1303

last_checker_status = notifychangeproperty(dbus.Int16,

1304

"LastCheckerStatus")

931

1305

last_approval_request = notifychangeproperty(

932

1306

datetime_to_dbus, "LastApprovalRequest")

933

1307

approved_by_default = notifychangeproperty(dbus.Boolean,

934

1308

"ApprovedByDefault")

935

approval_delay = notifychangeproperty(dbus.UInt16,

1309

approval_delay = notifychangeproperty(dbus.UInt64,

936

1310

"ApprovalDelay",

937

1311

type_func =

938

_timedelta_to_milliseconds)

1312

lambda td: td.total_seconds()

1313

* 1000)

939

1314

approval_duration = notifychangeproperty(

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1315

dbus.UInt64, "ApprovalDuration",

1316

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

942

1317

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

943

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

944

type_func =

945

_timedelta_to_milliseconds)

1318

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

1319

type_func = lambda td:

1320

td.total_seconds() * 1000)

946

1321

extended_timeout = notifychangeproperty(

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

1322

dbus.UInt64, "ExtendedTimeout",

1323

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

1324

interval = notifychangeproperty(dbus.UInt64,

950

1325

"Interval",

951

1326

type_func =

952

_timedelta_to_milliseconds)

1327

lambda td: td.total_seconds()

1328

* 1000)

953

1329

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

1330

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

1331

invalidate_only=True)

954

1332

955

1333

del notifychangeproperty

956

1334

983

1361

*args, **kwargs)

984

1362

985

1363

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

986

old_checker = self.checker

987

if self.checker is not None:

988

old_checker_pid = self.checker.pid

989

else:

990

old_checker_pid = None

1364

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

991

1365

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

992

1366

# Only if new checker process was started

993

1367

if (self.checker is not None

997

1371

return r

998

1372

999

1373

def _reset_approved(self):

1000

self._approved = None

1374

self.approved = None

1001

1375

return False

1002

1376

1003

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)

1004

1381

self.send_changedstate()

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1007

(self.approval_duration),

1008

self._reset_approved)

1009

1010

1382

1011

1383

## D-Bus methods, signals & properties

1012

_interface = "se.recompile.Mandos.Client"

1384

1385

## Interfaces

1013

1386

1014

1387

## Signals

1015

1388

1026

1399

pass

1027

1400

1028

1401

# PropertyChanged - signal

1402

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

1029

1403

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

1030

1404

def PropertyChanged(self, property, value):

1031

1405

"D-Bus signal"

1107

1481

access="readwrite")

1108

1482

def ApprovalDelay_dbus_property(self, value=None):

1109

1483

if value is None: # get

1110

return dbus.UInt64(self.approval_delay_milliseconds())

1484

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

1485

* 1000)

1111

1486

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

1112

1487

1113

1488

# ApprovalDuration - property

1115

1490

access="readwrite")

1116

1491

def ApprovalDuration_dbus_property(self, value=None):

1117

1492

if value is None: # get

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1119

self.approval_duration))

1493

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

1494

* 1000)

1120

1495

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

1121

1496

1122

1497

# Name - property

1135

1510

def Host_dbus_property(self, value=None):

1136

1511

if value is None: # get

1137

1512

return dbus.String(self.host)

1138

self.host = value

1513

self.host = str(value)

1139

1514

1140

1515

# Created - property

1141

1516

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

1142

1517

def Created_dbus_property(self):

1143

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

1518

return datetime_to_dbus(self.created)

1144

1519

1145

1520

# LastEnabled - property

1146

1521

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

1167

1542

return

1168

1543

return datetime_to_dbus(self.last_checked_ok)

1169

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

1170

1551

# Expires - property

1171

1552

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

1172

1553

def Expires_dbus_property(self):

1182

1563

access="readwrite")

1183

1564

def Timeout_dbus_property(self, value=None):

1184

1565

if value is None: # get

1185

return dbus.UInt64(self.timeout_milliseconds())

1566

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

1567

old_timeout = self.timeout

1186

1568

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

1187

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

1188

return

1189

# Reschedule timeout

1190

gobject.source_remove(self.disable_initiator_tag)

1191

self.disable_initiator_tag = None

1192

self.expires = None

1193

time_to_die = _timedelta_to_milliseconds((self

1194

.last_checked_ok

1195

+ self.timeout)

1196

- datetime.datetime

1197

.utcnow())

1198

if time_to_die <= 0:

1199

# The timeout has passed

1200

self.disable()

1201

else:

1202

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

1203

+ datetime.timedelta(milliseconds =

1204

time_to_die))

1205

self.disable_initiator_tag = (gobject.timeout_add

1206

(time_to_die, self.disable))

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))

1207

1585

1208

1586

# ExtendedTimeout - property

1209

1587

@dbus_service_property(_interface, signature="t",

1210

1588

access="readwrite")

1211

1589

def ExtendedTimeout_dbus_property(self, value=None):

1212

1590

if value is None: # get

1213

return dbus.UInt64(self.extended_timeout_milliseconds())

1591

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

1592

* 1000)

1214

1593

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

1215

1594

1216

1595

# Interval - property

1218

1597

access="readwrite")

1219

1598

def Interval_dbus_property(self, value=None):

1220

1599

if value is None: # get

1221

return dbus.UInt64(self.interval_milliseconds())

1600

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

1222

1601

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

1223

1602

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

1224

1603

return

1225

# Reschedule checker run

1226

gobject.source_remove(self.checker_initiator_tag)

1227

self.checker_initiator_tag = (gobject.timeout_add

1228

(value, self.start_checker))

1229

self.start_checker() # Start one now, too

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

1230

1610

1231

1611

# Checker - property

1232

1612

@dbus_service_property(_interface, signature="s",

1234

1614

def Checker_dbus_property(self, value=None):

1235

1615

if value is None: # get

1236

1616

return dbus.String(self.checker_command)

1237

self.checker_command = value

1617

self.checker_command = str(value)

1238

1618

1239

1619

# CheckerRunning - property

1240

1620

@dbus_service_property(_interface, signature="b",

1256

1636

@dbus_service_property(_interface, signature="ay",

1257

1637

access="write", byte_arrays=True)

1258

1638

def Secret_dbus_property(self, value):

1259

self.secret = str(value)

1639

self.secret = bytes(value)

1260

1640

1261

1641

del _interface

1262

1642

1269

1649

raise KeyError()

1270

1650

1271

1651

def __getattribute__(self, name):

1272

if(name == '_pipe'):

1652

if name == '_pipe':

1273

1653

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

1274

1654

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

1275

1655

data = self._pipe.recv()

1282

1662

return func

1283

1663

1284

1664

def __setattr__(self, name, value):

1285

if(name == '_pipe'):

1665

if name == '_pipe':

1286

1666

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

1287

1667

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

1288

1668

1289

class ClientDBusTransitional(ClientDBus):

1290

__metaclass__ = AlternateDBusNamesMetaclass

1291

1669

1292

1670

class ClientHandler(socketserver.BaseRequestHandler, object):

1293

1671

"""A class to handle client connections.

1298

1676

def handle(self):

1299

1677

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

1300

1678

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

1301

unicode(self.client_address))

1679

str(self.client_address))

1302

1680

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

1303

1681

self.server.child_pipe.fileno())

1304

1682

1330

1708

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

1331

1709

try:

1332

1710

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

1333

raise RuntimeError

1711

raise RuntimeError(line)

1334

1712

except (ValueError, IndexError, RuntimeError) as error:

1335

1713

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

1336

1714

return

1376

1754

client.Rejected("Disabled")

1377

1755

return

1378

1756

1379

if client._approved or not client.approval_delay:

1757

if client.approved or not client.approval_delay:

1380

1758

#We are approved or approval is disabled

1381

1759

break

1382

elif client._approved is None:

1760

elif client.approved is None:

1383

1761

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

1384

1762

client.name)

1385

1763

if self.server.use_dbus:

1386

1764

# Emit D-Bus signal

1387

1765

client.NeedApproval(

1388

client.approval_delay_milliseconds(),

1389

client.approved_by_default)

1766

client.approval_delay.total_seconds()

1767

* 1000, client.approved_by_default)

1390

1768

else:

1391

1769

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

1392

1770

client.name)

1398

1776

#wait until timeout or approved

1399

1777

time = datetime.datetime.now()

1400

1778

client.changedstate.acquire()

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1779

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

1404

1780

client.changedstate.release()

1405

1781

time2 = datetime.datetime.now()

1406

1782

if (time2 - time) >= delay:

1422

1798

try:

1423

1799

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

1424

1800

except gnutls.errors.GNUTLSError as error:

1425

logger.warning("gnutls send failed")

1801

logger.warning("gnutls send failed",

1802

exc_info=error)

1426

1803

return

1427

1804

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

1428

1805

sent, len(client.secret)

1431

1808

1432

1809

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

1433

1810

# bump the timeout using extended_timeout

1434

client.checked_ok(client.extended_timeout)

1811

client.bump_timeout(client.extended_timeout)

1435

1812

if self.server.use_dbus:

1436

1813

# Emit D-Bus signal

1437

1814

client.GotSecret()

1442

1819

try:

1443

1820

session.bye()

1444

1821

except gnutls.errors.GNUTLSError as error:

1445

logger.warning("GnuTLS bye failed")

1822

logger.warning("GnuTLS bye failed",

1823

exc_info=error)

1446

1824

1447

1825

@staticmethod

1448

1826

def peer_certificate(session):

1504

1882

# Convert the buffer to a Python bytestring

1505

1883

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

1506

1884

# Convert the bytestring to hexadecimal notation

1507

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

1885

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

1508

1886

return hex_fpr

1509

1887

1510

1888

1513

1891

def sub_process_main(self, request, address):

1514

1892

try:

1515

1893

self.finish_request(request, address)

1516

except:

1894

except Exception:

1517

1895

self.handle_error(request, address)

1518

1896

self.close_request(request)

1519

1897

1520

1898

def process_request(self, request, address):

1521

1899

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

1522

1900

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

1523

args = (request,

1524

address))

1901

args = (request, address))

1525

1902

proc.start()

1526

1903

return proc

1527

1904

1542

1919

1543

1920

def add_pipe(self, parent_pipe, proc):

1544

1921

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

1545

raise NotImplementedError

1922

raise NotImplementedError()

1546

1923

1547

1924

1548

1925

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1555

1932

use_ipv6: Boolean; to use IPv6 or not

1556

1933

"""

1557

1934

def __init__(self, server_address, RequestHandlerClass,

1558

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

"""

1559

1939

self.interface = interface

1560

1940

if use_ipv6:

1561

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.

1562

1968

socketserver.TCPServer.__init__(self, server_address,

1563

1969

RequestHandlerClass)

1970

1564

1971

def server_bind(self):

1565

1972

"""This overrides the normal server_bind() function

1566

1973

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

1574

1981

try:

1575

1982

self.socket.setsockopt(socket.SOL_SOCKET,

1576

1983

SO_BINDTODEVICE,

1577

str(self.interface

1578

+ '\0'))

1984

(self.interface + "\0")

1985

.encode("utf-8"))

1579

1986

except socket.error as error:

1580

if error[0] == errno.EPERM:

1581

logger.error("No permission to"

1582

" bind to interface %s",

1583

self.interface)

1584

elif error[0] == errno.ENOPROTOOPT:

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:

1585

1991

logger.error("SO_BINDTODEVICE not available;"

1586

1992

" cannot bind to interface %s",

1587

1993

self.interface)

1994

elif error.errno == errno.ENODEV:

1995

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

1996

" cannot bind", self.interface)

1588

1997

else:

1589

1998

raise

1590

1999

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

1593

2002

if self.address_family == socket.AF_INET6:

1594

2003

any_address = "::" # in6addr_any

1595

2004

else:

1596

any_address = socket.INADDR_ANY

2005

any_address = "0.0.0.0" # INADDR_ANY

1597

2006

self.server_address = (any_address,

1598

2007

self.server_address[1])

1599

2008

elif not self.server_address[1]:

1620

2029

"""

1621

2030

def __init__(self, server_address, RequestHandlerClass,

1622

2031

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

1623

gnutls_priority=None, use_dbus=True):

2032

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

1624

2033

self.enabled = False

1625

2034

self.clients = clients

1626

2035

if self.clients is None:

1627

self.clients = set()

2036

self.clients = {}

1628

2037

self.use_dbus = use_dbus

1629

2038

self.gnutls_priority = gnutls_priority

1630

2039

IPv6_TCPServer.__init__(self, server_address,

1631

2040

RequestHandlerClass,

1632

2041

interface = interface,

1633

use_ipv6 = use_ipv6)

2042

use_ipv6 = use_ipv6,

2043

socketfd = socketfd)

1634

2044

def server_activate(self):

1635

2045

if self.enabled:

1636

2046

return socketserver.TCPServer.server_activate(self)

1649

2059

1650

2060

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

1651

2061

proc = None, client_object=None):

1652

condition_names = {

1653

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

1654

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

1655

# blocking).

1656

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

1657

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

1658

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

1659

# broken, usually for pipes and

1660

# sockets).

1661

}

1662

conditions_string = ' | '.join(name

1663

for cond, name in

1664

condition_names.iteritems()

1665

if cond & condition)

1666

2062

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

1667

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

2063

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

1668

2064

# Wait for other process to exit

1669

2065

proc.join()

1670

2066

return False

1677

2073

fpr = request[1]

1678

2074

address = request[2]

1679

2075

1680

for c in self.clients:

2076

for c in self.clients.itervalues():

1681

2077

if c.fingerprint == fpr:

1682

2078

client = c

1683

2079

break

1728

2124

return True

1729

2125

1730

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

1731

2226

def string_to_delta(interval):

1732

2227

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

1733

2228

1744

2239

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

1745

2240

datetime.timedelta(0, 330)

1746

2241

"""

2242

2243

try:

2244

return rfc3339_duration_to_delta(interval)

2245

except ValueError:

2246

pass

2247

1747

2248

timevalue = datetime.timedelta(0)

1748

2249

for s in interval.split():

1749

2250

try:

1750

suffix = unicode(s[-1])

2251

suffix = s[-1]

1751

2252

value = int(s[:-1])

1752

2253

if suffix == "d":

1753

2254

delta = datetime.timedelta(value)

1760

2261

elif suffix == "w":

1761

2262

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

1762

2263

else:

1763

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

1764

except (ValueError, IndexError) as e:

2264

raise ValueError("Unknown suffix {!r}"

2265

.format(suffix))

2266

except IndexError as e:

1765

2267

raise ValueError(*(e.args))

1766

2268

timevalue += delta

1767

2269

return timevalue

1768

2270

1769

2271

1770

def if_nametoindex(interface):

1771

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

1772

1773

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

1774

global if_nametoindex

1775

try:

1776

if_nametoindex = (ctypes.cdll.LoadLibrary

1777

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

1778

.if_nametoindex)

1779

except (OSError, AttributeError):

1780

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

1781

def if_nametoindex(interface):

1782

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

1783

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

1784

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

1785

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1786

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

1787

interface))

1788

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

1789

ifreq[16:20])[0]

1790

return interface_index

1791

return if_nametoindex(interface)

1792

1793

1794

2272

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

1795

2273

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

1796

2274

1804

2282

sys.exit()

1805

2283

if not noclose:

1806

2284

# Close all standard open file descriptors

1807

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

2285

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

1808

2286

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

1809

raise OSError(errno.ENODEV,

1810

"%s not a character device"

1811

% os.path.devnull)

2287

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

2288

.format(os.devnull))

1812

2289

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

1813

2290

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

1814

2291

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

1823

2300

1824

2301

parser = argparse.ArgumentParser()

1825

2302

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

1826

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

2303

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

1827

2304

help="show version number and exit")

1828

2305

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

1829

2306

help="Bind to interface IF")

1835

2312

help="Run self-test")

1836

2313

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

1837

2314

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

1838

" to terminal")

2315

" to terminal", default=None)

1839

2316

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

1840

2317

help="Debug level for stdout output")

1841

2318

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

1848

2325

" files")

1849

2326

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

1850

2327

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

1851

" system bus interface")

2328

" system bus interface", default=None)

1852

2329

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

1853

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

1854

2346

options = parser.parse_args()

1855

2347

1856

2348

if options.check:

1857

2349

import doctest

1858

doctest.testmod()

1859

sys.exit()

2350

fail_count, test_count = doctest.testmod()

2351

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

1860

2352

1861

2353

# Default values for config file for server-global settings

1862

2354

server_defaults = { "interface": "",

1864

2356

"port": "",

1865

2357

"debug": "False",

1866

2358

"priority":

1867

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

2359

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

2360

":+SIGN-RSA-SHA224:+SIGN-RSA-RMD160",

1868

2361

"servicename": "Mandos",

1869

2362

"use_dbus": "True",

1870

2363

"use_ipv6": "True",

1871

2364

"debuglevel": "",

2365

"restore": "True",

2366

"socket": "",

2367

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

2368

"foreground": "False",

2369

"zeroconf": "True",

1872

2370

}

1873

2371

1874

2372

# Parse config file for server-global settings

1879

2377

# Convert the SafeConfigParser object to a dict

1880

2378

server_settings = server_config.defaults()

1881

2379

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

1882

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

2380

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

1883

2381

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

1884

2382

option)

1885

2383

if server_settings["port"]:

1886

2384

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

1887

2385

"port")

2386

if server_settings["socket"]:

2387

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

2388

"socket")

2389

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

2390

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

2391

# happen with a supplied network socket.

2392

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

2393

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

2394

["socket"])

1888

2395

del server_config

1889

2396

1890

2397

# Override the settings from the config file with command line

1891

2398

# options, if set.

1892

2399

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

1893

2400

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

1894

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

2401

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

2402

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

1895

2403

value = getattr(options, option)

1896

2404

if value is not None:

1897

2405

server_settings[option] = value

1898

2406

del options

1899

2407

# Force all strings to be unicode

1900

2408

for option in server_settings.keys():

1901

if type(server_settings[option]) is str:

1902

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

2409

if isinstance(server_settings[option], bytes):

2410

server_settings[option] = (server_settings[option]

2411

.decode("utf-8"))

2412

# Force all boolean options to be boolean

2413

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

2414

"foreground", "zeroconf"):

2415

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

2416

# Debug implies foreground

2417

if server_settings["debug"]:

2418

server_settings["foreground"] = True

1903

2419

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

1904

2420

1905

2421

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

1906

2422

2423

if (not server_settings["zeroconf"] and

2424

not (server_settings["port"]

2425

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

2426

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

2427

" Zeroconf")

2428

1907

2429

# For convenience

1908

2430

debug = server_settings["debug"]

1909

2431

debuglevel = server_settings["debuglevel"]

1910

2432

use_dbus = server_settings["use_dbus"]

1911

2433

use_ipv6 = server_settings["use_ipv6"]

2434

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

2435

stored_state_file)

2436

foreground = server_settings["foreground"]

2437

zeroconf = server_settings["zeroconf"]

2438

2439

if debug:

2440

initlogger(debug, logging.DEBUG)

2441

else:

2442

if not debuglevel:

2443

initlogger(debug)

2444

else:

2445

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

2446

initlogger(debug, level)

1912

2447

1913

2448

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

1914

2449

syslogger.setFormatter(logging.Formatter

1915

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

1916

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

1917

% server_settings["servicename"]))

2450

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

2451

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

2452

.format(server_settings

2453

["servicename"])))

1918

2454

1919

2455

# Parse config file with clients

1920

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

1921

"extended_timeout": "15m",

1922

"interval": "2m",

1923

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

1924

"host": "",

1925

"approval_delay": "0s",

1926

"approval_duration": "1s",

1927

}

1928

client_config = configparser.SafeConfigParser(client_defaults)

2456

client_config = configparser.SafeConfigParser(Client

2457

.client_defaults)

1929

2458

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

1930

2459

"clients.conf"))

1931

2460

1932

2461

global mandos_dbus_service

1933

2462

mandos_dbus_service = None

1934

2463

2464

socketfd = None

2465

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

2466

socketfd = server_settings["socket"]

1935

2467

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

1936

2468

server_settings["port"]),

1937

2469

ClientHandler,

1940

2472

use_ipv6=use_ipv6,

1941

2473

gnutls_priority=

1942

2474

server_settings["priority"],

1943

use_dbus=use_dbus)

1944

if not debug:

1945

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

2475

use_dbus=use_dbus,

2476

socketfd=socketfd)

2477

if not foreground:

2478

pidfilename = "/run/mandos.pid"

2479

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

2480

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

2481

pidfile = None

1946

2482

try:

1947

2483

pidfile = open(pidfilename, "w")

1948

except IOError:

1949

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

2484

except IOError as e:

2485

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

2486

exc_info=e)

1950

2487

1951

try:

1952

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

1953

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

1954

except KeyError:

2488

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

1955

2489

try:

1956

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

1957

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

2490

uid = pwd.getpwnam(name).pw_uid

2491

gid = pwd.getpwnam(name).pw_gid

2492

break

1958

2493

except KeyError:

1959

try:

1960

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

1961

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

1962

except KeyError:

1963

uid = 65534

1964

gid = 65534

2494

continue

2495

else:

2496

uid = 65534

2497

gid = 65534

1965

2498

try:

1966

2499

os.setgid(gid)

1967

2500

os.setuid(uid)

1968

2501

except OSError as error:

1969

if error[0] != errno.EPERM:

1970

raise error

1971

1972

if not debug and not debuglevel:

1973

syslogger.setLevel(logging.WARNING)

1974

console.setLevel(logging.WARNING)

1975

if debuglevel:

1976

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

1977

syslogger.setLevel(level)

1978

console.setLevel(level)

2502

if error.errno != errno.EPERM:

2503

raise

1979

2504

1980

2505

if debug:

1981

2506

# Enable all possible GnuTLS debugging

1992

2517

.gnutls_global_set_log_function(debug_gnutls))

1993

2518

1994

2519

# Redirect stdin so all checkers get /dev/null

1995

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

2520

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

1996

2521

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

1997

2522

if null > 2:

1998

2523

os.close(null)

1999

else:

2000

# No console logging

2001

logger.removeHandler(console)

2002

2524

2003

2525

# Need to fork before connecting to D-Bus

2004

if not debug:

2526

if not foreground:

2005

2527

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

2006

2528

daemon()

2007

2529

2530

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

2531

# need to inform gobject that threads will be used.

2532

gobject.threads_init()

2533

2008

2534

global main_loop

2009

2535

# From the Avahi example code

2010

DBusGMainLoop(set_as_default=True )

2536

DBusGMainLoop(set_as_default=True)

2011

2537

main_loop = gobject.MainLoop()

2012

2538

bus = dbus.SystemBus()

2013

2539

# End of Avahi example code

2019

2545

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

2020

2546

do_not_queue=True))

2021

2547

except dbus.exceptions.NameExistsException as e:

2022

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

2548

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

2023

2549

use_dbus = False

2024

2550

server_settings["use_dbus"] = False

2025

2551

tcp_server.use_dbus = False

2026

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2027

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

2028

servicetype = "_mandos._tcp",

2029

protocol = protocol, bus = bus)

2030

if server_settings["interface"]:

2031

service.interface = (if_nametoindex

2032

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

2552

if zeroconf:

2553

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2554

service = AvahiServiceToSyslog(name =

2555

server_settings["servicename"],

2556

servicetype = "_mandos._tcp",

2557

protocol = protocol, bus = bus)

2558

if server_settings["interface"]:

2559

service.interface = (if_nametoindex

2560

(server_settings["interface"]

2561

.encode("utf-8")))

2033

2562

2034

2563

global multiprocessing_manager

2035

2564

multiprocessing_manager = multiprocessing.Manager()

2036

2565

2037

2566

client_class = Client

2038

2567

if use_dbus:

2039

client_class = functools.partial(ClientDBusTransitional,

2040

bus = bus)

2041

def client_config_items(config, section):

2042

special_settings = {

2043

"approved_by_default":

2044

lambda: config.getboolean(section,

2045

"approved_by_default"),

2046

}

2047

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

2568

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

2569

2570

client_settings = Client.config_parser(client_config)

2571

old_client_settings = {}

2572

clients_data = {}

2573

2574

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

2575

global wnull

2576

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

2577

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

2578

# mode

2579

if debug or not foreground:

2580

wnull.close()

2581

2582

# Get client data and settings from last running state.

2583

if server_settings["restore"]:

2584

try:

2585

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

2586

clients_data, old_client_settings = (pickle.load

2587

(stored_state))

2588

os.remove(stored_state_path)

2589

except IOError as e:

2590

if e.errno == errno.ENOENT:

2591

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

2592

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

2593

else:

2594

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

2595

exc_info=e)

2596

raise

2597

except EOFError as e:

2598

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

2599

"EOFError:", exc_info=e)

2600

2601

with PGPEngine() as pgp:

2602

for client_name, client in clients_data.items():

2603

# Skip removed clients

2604

if client_name not in client_settings:

2605

continue

2606

2607

# Decide which value to use after restoring saved state.

2608

# We have three different values: Old config file,

2609

# new config file, and saved state.

2610

# New config value takes precedence if it differs from old

2611

# config value, otherwise use saved state.

2612

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

2613

try:

2614

# For each value in new config, check if it

2615

# differs from the old config value (Except for

2616

# the "secret" attribute)

2617

if (name != "secret" and

2618

value != old_client_settings[client_name]

2619

[name]):

2620

client[name] = value

2621

except KeyError:

2622

pass

2623

2624

# Clients who has passed its expire date can still be

2625

# enabled if its last checker was successful. Clients

2626

# whose checker succeeded before we stored its state is

2627

# assumed to have successfully run all checkers during

2628

# downtime.

2629

if client["enabled"]:

2630

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

2631

if not client["last_checked_ok"]:

2632

logger.warning(

2633

"disabling client {} - Client never "

2634

"performed a successful checker"

2635

.format(client_name))

2636

client["enabled"] = False

2637

elif client["last_checker_status"] != 0:

2638

logger.warning(

2639

"disabling client {} - Client last"

2640

" checker failed with error code {}"

2641

.format(client_name,

2642

client["last_checker_status"]))

2643

client["enabled"] = False

2644

else:

2645

client["expires"] = (datetime.datetime

2646

.utcnow()

2647

+ client["timeout"])

2648

logger.debug("Last checker succeeded,"

2649

" keeping {} enabled"

2650

.format(client_name))

2048

2651

try:

2049

yield (name, special_settings[name]())

2050

except KeyError:

2051

yield (name, value)

2052

2053

tcp_server.clients.update(set(

2054

client_class(name = section,

2055

config= dict(client_config_items(

2056

client_config, section)))

2057

for section in client_config.sections()))

2652

client["secret"] = (

2653

pgp.decrypt(client["encrypted_secret"],

2654

client_settings[client_name]

2655

["secret"]))

2656

except PGPError:

2657

# If decryption fails, we use secret from new settings

2658

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

2659

.format(client_name))

2660

client["secret"] = (

2661

client_settings[client_name]["secret"])

2662

2663

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

2664

for client_name in (set(old_client_settings)

2665

- set(client_settings)):

2666

del clients_data[client_name]

2667

for client_name in (set(client_settings)

2668

- set(old_client_settings)):

2669

clients_data[client_name] = client_settings[client_name]

2670

2671

# Create all client objects

2672

for client_name, client in clients_data.items():

2673

tcp_server.clients[client_name] = client_class(

2674

name = client_name, settings = client,

2675

server_settings = server_settings)

2676

2058

2677

if not tcp_server.clients:

2059

2678

logger.warning("No clients defined")

2060

2061

if not debug:

2062

try:

2063

with pidfile:

2064

pid = os.getpid()

2065

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

2066

del pidfile

2067

except IOError:

2068

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

2069

pidfilename, pid)

2070

except NameError:

2071

# "pidfile" was never created

2072

pass

2679

2680

if not foreground:

2681

if pidfile is not None:

2682

try:

2683

with pidfile:

2684

pid = os.getpid()

2685

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

2686

except IOError:

2687

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

2688

pidfilename, pid)

2689

del pidfile

2073

2690

del pidfilename

2074

2075

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

2076

2691

2077

2692

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

2078

2693

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

2079

2694

2080

2695

if use_dbus:

2081

class MandosDBusService(dbus.service.Object):

2696

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

2697

"se.bsnet.fukt.Mandos"})

2698

class MandosDBusService(DBusObjectWithProperties):

2082

2699

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

2083

2700

def __init__(self):

2084

2701

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

2085

2702

_interface = "se.recompile.Mandos"

2086

2703

2704

@dbus_interface_annotations(_interface)

2705

def _foo(self):

2706

return { "org.freedesktop.DBus.Property"

2707

".EmitsChangedSignal":

2708

"false"}

2709

2087

2710

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

2088

2711

def ClientAdded(self, objpath):

2089

2712

"D-Bus signal"

2103

2726

def GetAllClients(self):

2104

2727

"D-Bus method"

2105

2728

return dbus.Array(c.dbus_object_path

2106

for c in tcp_server.clients)

2729

for c in

2730

tcp_server.clients.itervalues())

2107

2731

2108

2732

@dbus.service.method(_interface,

2109

2733

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

2110

2734

def GetAllClientsWithProperties(self):

2111

2735

"D-Bus method"

2112

2736

return dbus.Dictionary(

2113

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

2114

for c in tcp_server.clients),

2737

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

2738

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

2115

2739

signature="oa{sv}")

2116

2740

2117

2741

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

2118

2742

def RemoveClient(self, object_path):

2119

2743

"D-Bus method"

2120

for c in tcp_server.clients:

2744

for c in tcp_server.clients.itervalues():

2121

2745

if c.dbus_object_path == object_path:

2122

tcp_server.clients.remove(c)

2746

del tcp_server.clients[c.name]

2123

2747

c.remove_from_connection()

2124

2748

# Don't signal anything except ClientRemoved

2125

2749

c.disable(quiet=True)

2130

2754

2131

2755

del _interface

2132

2756

2133

class MandosDBusServiceTransitional(MandosDBusService):

2134

__metaclass__ = AlternateDBusNamesMetaclass

2135

mandos_dbus_service = MandosDBusServiceTransitional()

2757

mandos_dbus_service = MandosDBusService()

2136

2758

2137

2759

def cleanup():

2138

2760

"Cleanup function; run on exit"

2139

service.cleanup()

2761

if zeroconf:

2762

service.cleanup()

2140

2763

2141

2764

multiprocessing.active_children()

2765

wnull.close()

2766

if not (tcp_server.clients or client_settings):

2767

return

2768

2769

# Store client before exiting. Secrets are encrypted with key

2770

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

2771

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

2772

clients = {}

2773

with PGPEngine() as pgp:

2774

for client in tcp_server.clients.itervalues():

2775

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

2776

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

2777

key)

2778

client_dict = {}

2779

2780

# A list of attributes that can not be pickled

2781

# + secret.

2782

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

2783

"checker", "server_settings" }

2784

for name, typ in (inspect.getmembers

2785

(dbus.service.Object)):

2786

exclude.add(name)

2787

2788

client_dict["encrypted_secret"] = (client

2789

.encrypted_secret)

2790

for attr in client.client_structure:

2791

if attr not in exclude:

2792

client_dict[attr] = getattr(client, attr)

2793

2794

clients[client.name] = client_dict

2795

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

2796

2797

try:

2798

with (tempfile.NamedTemporaryFile

2799

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

2800

dir=os.path.dirname(stored_state_path),

2801

delete=False)) as stored_state:

2802

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

2803

tempname=stored_state.name

2804

os.rename(tempname, stored_state_path)

2805

except (IOError, OSError) as e:

2806

if not debug:

2807

try:

2808

os.remove(tempname)

2809

except NameError:

2810

pass

2811

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

2812

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

2813

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

2814

else:

2815

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

2816

exc_info=e)

2817

raise

2818

2819

# Delete all clients, and settings from config

2142

2820

while tcp_server.clients:

2143

client = tcp_server.clients.pop()

2821

name, client = tcp_server.clients.popitem()

2144

2822

if use_dbus:

2145

2823

client.remove_from_connection()

2146

client.disable_hook = None

2147

2824

# Don't signal anything except ClientRemoved

2148

2825

client.disable(quiet=True)

2149

2826

if use_dbus:

2151

2828

mandos_dbus_service.ClientRemoved(client

2152

2829

.dbus_object_path,

2153

2830

client.name)

2831

client_settings.clear()

2154

2832

2155

2833

atexit.register(cleanup)

2156

2834

2157

for client in tcp_server.clients:

2835

for client in tcp_server.clients.itervalues():

2158

2836

if use_dbus:

2159

2837

# Emit D-Bus signal

2160

2838

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2161

client.enable()

2839

# Need to initiate checking of clients

2840

if client.enabled:

2841

client.init_checker()

2162

2842

2163

2843

tcp_server.enable()

2164

2844

tcp_server.server_activate()

2165

2845

2166

2846

# Find out what port we got

2167

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

2847

if zeroconf:

2848

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

2168

2849

if use_ipv6:

2169

2850

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

2170

" flowinfo %d, scope_id %d"

2171

% tcp_server.socket.getsockname())

2851

" flowinfo %d, scope_id %d",

2852

*tcp_server.socket.getsockname())

2172

2853

else: # IPv4

2173

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

2174

% tcp_server.socket.getsockname())

2854

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

2855

*tcp_server.socket.getsockname())

2175

2856

2176

2857

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

2177

2858

2178

2859

try:

2179

# From the Avahi example code

2180

try:

2181

service.activate()

2182

except dbus.exceptions.DBusException as error:

2183

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

2184

cleanup()

2185

sys.exit(1)

2186

# End of Avahi example code

2860

if zeroconf:

2861

# From the Avahi example code

2862

try:

2863

service.activate()

2864

except dbus.exceptions.DBusException as error:

2865

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

2866

cleanup()

2867

sys.exit(1)

2868

# End of Avahi example code

2187

2869

2188

2870

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

2189

2871

lambda *args, **kwargs:

2193

2875

logger.debug("Starting main loop")

2194

2876

main_loop.run()

2195

2877

except AvahiError as error:

2196

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

2878

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

2197

2879

cleanup()

2198

2880

sys.exit(1)

2199

2881

except KeyboardInterrupt:

2204

2886

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

2205

2887

cleanup()

2206

2888

2207

2208

2889

if __name__ == '__main__':

2209

2890

main()