/mandos/trunk : revision 505.1.2

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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 = "1.6.5"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = None

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler

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(facility =

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logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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version = "1.3.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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return _timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return _timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return _timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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return _timedelta_to_milliseconds(self.approval_delay)

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

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

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

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attribute."""

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self.name = name

535

if server_settings is None:

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server_settings = {}

537

self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

540

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

550

self.expires = None

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if config is None:

339

config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

344

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

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.replace(" ", ""))

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

347

if "secret" in config:

348

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

349

elif "secfile" in config:

350

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

351

(config["secfile"])),

352

"rb") as secfile:

353

self.secret = secfile.read()

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else:

355

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

356

% self.name)

357

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

358

self.created = datetime.datetime.utcnow()

359

self.enabled = False

360

self.last_approval_request = None

361

self.last_enabled = None

362

self.last_checked_ok = None

363

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

364

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

365

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

366

self.disable_hook = disable_hook

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self.checker = None

562

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self.checker_initiator_tag = None

563

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self.disable_initiator_tag = None

370

self.expires = None

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self.checker_callback_tag = None

372

self.checker_command = config["checker"]

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self.current_checker_command = None

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self.approved = None

374

self.last_connect = None

375

self._approved = None

376

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

377

True)

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self.approvals_pending = 0

568

self.changedstate = (multiprocessing_manager

569

.Condition(multiprocessing_manager

570

.Lock()))

571

self.client_structure = [attr for attr in

572

self.__dict__.iterkeys()

573

if not attr.startswith("_")]

574

self.client_structure.append("client_structure")

575

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

577

lambda obj:

578

isinstance(obj,

579

property)):

580

if not name.startswith("_"):

581

self.client_structure.append(name)

379

self.approval_delay = string_to_delta(

380

config["approval_delay"])

381

self.approval_duration = string_to_delta(

382

config["approval_duration"])

383

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

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# Send notice to process children that client state has changed

584

385

def send_changedstate(self):

585

with self.changedstate:

586

self.changedstate.notify_all()

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386

self.changedstate.acquire()

387

self.changedstate.notify_all()

388

self.changedstate.release()

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def enable(self):

589

391

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

590

392

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

591

393

# Already enabled

592

394

return

395

self.send_changedstate()

396

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

397

# and every interval from then on.

398

self.checker_initiator_tag = (gobject.timeout_add

399

(self.interval_milliseconds(),

400

self.start_checker))

401

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

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

403

self.disable_initiator_tag = (gobject.timeout_add

404

(self.timeout_milliseconds(),

405

self.disable))

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self.enabled = True

595

407

self.last_enabled = datetime.datetime.utcnow()

596

self.init_checker()

597

self.send_changedstate()

408

# Also start a new checker *right now*.

409

self.start_checker()

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411

def disable(self, quiet=True):

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412

"""Disable this client."""

601

413

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

602

414

return False

603

415

if not quiet:

416

self.send_changedstate()

417

if not quiet:

604

418

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

605

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

419

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

606

420

gobject.source_remove(self.disable_initiator_tag)

607

421

self.disable_initiator_tag = None

608

422

self.expires = None

609

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

423

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

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gobject.source_remove(self.checker_initiator_tag)

611

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self.checker_initiator_tag = None

612

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self.stop_checker()

427

if self.disable_hook:

428

self.disable_hook(self)

613

429

self.enabled = False

614

if not quiet:

615

self.send_changedstate()

616

430

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

617

431

return False

618

432

619

433

def __del__(self):

434

self.disable_hook = None

620

435

self.disable()

621

436

622

def init_checker(self):

623

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

624

# and every interval from then on.

625

if self.checker_initiator_tag is not None:

626

gobject.source_remove(self.checker_initiator_tag)

627

self.checker_initiator_tag = (gobject.timeout_add

628

(self.interval_milliseconds(),

629

self.start_checker))

630

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

631

if self.disable_initiator_tag is not None:

632

gobject.source_remove(self.disable_initiator_tag)

633

self.disable_initiator_tag = (gobject.timeout_add

634

(self.timeout_milliseconds(),

635

self.disable))

636

# Also start a new checker *right now*.

637

self.start_checker()

638

639

437

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

640

438

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

641

439

self.checker_callback_tag = None

642

440

self.checker = None

643

441

if os.WIFEXITED(condition):

644

self.last_checker_status = os.WEXITSTATUS(condition)

645

if self.last_checker_status == 0:

442

exitstatus = os.WEXITSTATUS(condition)

443

if exitstatus == 0:

646

444

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

647

445

vars(self))

648

446

self.checked_ok()

650

448

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

651

449

vars(self))

652

450

else:

653

self.last_checker_status = -1

654

451

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

655

452

vars(self))

656

453

657

def checked_ok(self):

658

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

659

self.last_checked_ok = datetime.datetime.utcnow()

660

self.last_checker_status = 0

661

self.bump_timeout()

662

663

def bump_timeout(self, timeout=None):

664

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

454

def checked_ok(self, timeout=None):

455

"""Bump up the timeout for this client.

456

457

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

458

alive and well.

459

"""

665

460

if timeout is None:

666

461

timeout = self.timeout

667

if self.disable_initiator_tag is not None:

668

gobject.source_remove(self.disable_initiator_tag)

669

self.disable_initiator_tag = None

670

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

671

self.disable_initiator_tag = (gobject.timeout_add

672

(timedelta_to_milliseconds

673

(timeout), self.disable))

674

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

462

self.last_checked_ok = datetime.datetime.utcnow()

463

gobject.source_remove(self.disable_initiator_tag)

464

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

465

self.disable_initiator_tag = (gobject.timeout_add

466

(_timedelta_to_milliseconds(timeout),

467

self.disable))

675

468

676

469

def need_approval(self):

677

470

self.last_approval_request = datetime.datetime.utcnow()

682

475

If a checker already exists, leave it running and do

683

476

nothing."""

684

477

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

685

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

686

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

687

# would inevitably timeout, since no checker would get a

688

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

478

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

479

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

480

# client would inevitably timeout, since no checker would get

481

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

689

482

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

690

483

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

691

484

# should be.

693

486

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

694

487

try:

695

488

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

696

except AttributeError:

697

pass

698

except OSError as error:

699

if error.errno != errno.ECHILD:

700

raise

489

except (AttributeError, OSError) as error:

490

if (isinstance(error, OSError)

491

and error.errno != errno.ECHILD):

492

raise error

701

493

else:

702

494

if pid:

703

495

logger.warning("Checker was a zombie")

706

498

self.current_checker_command)

707

499

# Start a new checker if needed

708

500

if self.checker is None:

709

# Escape attributes for the shell

710

escaped_attrs = dict(

711

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

712

for attr in

713

self.runtime_expansions)

714

501

try:

715

command = self.checker_command % escaped_attrs

716

except TypeError as error:

717

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

718

self.checker_command, exc_info=error)

719

return True # Try again later

502

# In case checker_command has exactly one % operator

503

command = self.checker_command % self.host

504

except TypeError:

505

# Escape attributes for the shell

506

escaped_attrs = dict(

507

(attr,

508

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

509

errors=

510

'replace')))

511

for attr in

512

self.runtime_expansions)

513

514

try:

515

command = self.checker_command % escaped_attrs

516

except TypeError as error:

517

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

518

' %s', self.checker_command, error)

519

return True # Try again later

720

520

self.current_checker_command = command

721

521

try:

722

522

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

725

525

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

726

526

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

727

527

# always replaced by /dev/null.)

728

# The exception is when not debugging but nevertheless

729

# running in the foreground; use the previously

730

# created wnull.

731

popen_args = {}

732

if (not self.server_settings["debug"]

733

and self.server_settings["foreground"]):

734

popen_args.update({"stdout": wnull,

735

"stderr": wnull })

736

528

self.checker = subprocess.Popen(command,

737

529

close_fds=True,

738

shell=True, cwd="/",

739

**popen_args)

740

except OSError as error:

741

logger.error("Failed to start subprocess",

742

exc_info=error)

743

return True

744

self.checker_callback_tag = (gobject.child_watch_add

745

(self.checker.pid,

746

self.checker_callback,

747

data=command))

748

# The checker may have completed before the gobject

749

# watch was added. Check for this.

750

try:

530

shell=True, cwd="/")

531

self.checker_callback_tag = (gobject.child_watch_add

532

(self.checker.pid,

533

self.checker_callback,

534

data=command))

535

# The checker may have completed before the gobject

536

# watch was added. Check for this.

751

537

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

538

if pid:

539

gobject.source_remove(self.checker_callback_tag)

540

self.checker_callback(pid, status, command)

752

541

except OSError as error:

753

if error.errno == errno.ECHILD:

754

# This should never happen

755

logger.error("Child process vanished",

756

exc_info=error)

757

return True

758

raise

759

if pid:

760

gobject.source_remove(self.checker_callback_tag)

761

self.checker_callback(pid, status, command)

542

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

543

error)

762

544

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

763

545

return True

764

546

771

553

return

772

554

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

773

555

try:

774

self.checker.terminate()

556

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

775

557

#time.sleep(0.5)

776

558

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

777

# self.checker.kill()

559

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

778

560

except OSError as error:

779

561

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

780

562

raise

797

579

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

798

580

if byte_arrays and signature != "ay":

799

581

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

800

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

582

" signature %r" % signature)

801

583

def decorator(func):

802

584

func._dbus_is_property = True

803

585

func._dbus_interface = dbus_interface

811

593

return decorator

812

594

813

595

814

def dbus_interface_annotations(dbus_interface):

815

"""Decorator for marking functions returning interface annotations

816

817

Usage:

818

819

@dbus_interface_annotations("org.example.Interface")

820

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

821

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

822

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

823

"false"}

824

"""

825

def decorator(func):

826

func._dbus_is_interface = True

827

func._dbus_interface = dbus_interface

828

func._dbus_name = dbus_interface

829

return func

830

return decorator

831

832

833

def dbus_annotations(annotations):

834

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

835

Usage:

836

837

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

838

access="r")

839

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

840

"org.freedesktop.DBus.Property."

841

"EmitsChangedSignal": "false"})

842

def Property_dbus_property(self):

843

return dbus.Boolean(False)

844

"""

845

def decorator(func):

846

func._dbus_annotations = annotations

847

return func

848

return decorator

849

850

851

596

class DBusPropertyException(dbus.exceptions.DBusException):

852

597

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

853

598

"""

876

621

"""

877

622

878

623

@staticmethod

879

def _is_dbus_thing(thing):

880

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

881

882

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

883

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

884

"""

885

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

886

False)

624

def _is_dbus_property(obj):

625

return getattr(obj, "_dbus_is_property", False)

887

626

888

def _get_all_dbus_things(self, thing):

627

def _get_all_dbus_properties(self):

889

628

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

890

629

"""

891

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

892

name),

893

athing.__get__(self))

630

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

894

631

for cls in self.__class__.__mro__

895

for name, athing in

896

inspect.getmembers(cls,

897

self._is_dbus_thing(thing)))

632

for name, prop in inspect.getmembers(cls, self._is_dbus_property))

898

633

899

634

def _get_dbus_property(self, interface_name, property_name):

900

635

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

901

636

property with the specified name and interface.

902

637

"""

903

638

for cls in self.__class__.__mro__:

904

for name, value in (inspect.getmembers

905

(cls,

906

self._is_dbus_thing("property"))):

907

if (value._dbus_name == property_name

908

and value._dbus_interface == interface_name):

639

for name, value in inspect.getmembers(cls, self._is_dbus_property):

640

if value._dbus_name == property_name and value._dbus_interface == interface_name:

909

641

return value.__get__(self)

910

642

911

643

# No such property

937

669

# The byte_arrays option is not supported yet on

938

670

# signatures other than "ay".

939

671

if prop._dbus_signature != "ay":

940

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

941

"'ay' signature {0!r}"

942

.format(prop._dbus_signature))

943

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

944

for byte in value))

672

raise ValueError

673

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

674

for byte in value))

945

675

prop(value)

946

676

947

677

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

952

682

953

683

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

954

684

"""

955

properties = {}

956

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

685

all = {}

686

for name, prop in self._get_all_dbus_properties():

957

687

if (interface_name

958

688

and interface_name != prop._dbus_interface):

959

689

# Interface non-empty but did not match

963

693

continue

964

694

value = prop()

965

695

if not hasattr(value, "variant_level"):

966

properties[name] = value

696

all[name] = value

967

697

continue

968

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

969

value.variant_level+1)

970

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

698

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

699

value.variant_level+1)

700

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

971

701

972

702

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

973

703

out_signature="s",

974

704

path_keyword='object_path',

975

705

connection_keyword='connection')

976

706

def Introspect(self, object_path, connection):

977

"""Overloading of standard D-Bus method.

978

979

Inserts property tags and interface annotation tags.

707

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

980

708

"""

981

709

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

982

710

connection)

989

717

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

990

718

return e

991

719

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

992

# Add property tags

993

720

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

994

721

for name, prop

995

in self._get_all_dbus_things("property")

722

in self._get_all_dbus_properties()

996

723

if prop._dbus_interface

997

724

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

998

725

if_tag.appendChild(tag)

999

# Add annotation tags

1000

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

1001

for tag in if_tag.getElementsByTagName(typ):

1002

annots = dict()

1003

for name, prop in (self.

1004

_get_all_dbus_things(typ)):

1005

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

1006

and prop._dbus_interface

1007

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

1008

annots.update(getattr

1009

(prop,

1010

"_dbus_annotations",

1011

{}))

1012

for name, value in annots.iteritems():

1013

ann_tag = document.createElement(

1014

"annotation")

1015

ann_tag.setAttribute("name", name)

1016

ann_tag.setAttribute("value", value)

1017

tag.appendChild(ann_tag)

1018

# Add interface annotation tags

1019

for annotation, value in dict(

1020

itertools.chain.from_iterable(

1021

annotations().iteritems()

1022

for name, annotations in

1023

self._get_all_dbus_things("interface")

1024

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

1025

)).iteritems():

1026

ann_tag = document.createElement("annotation")

1027

ann_tag.setAttribute("name", annotation)

1028

ann_tag.setAttribute("value", value)

1029

if_tag.appendChild(ann_tag)

1030

726

# Add the names to the return values for the

1031

727

# "org.freedesktop.DBus.Properties" methods

1032

728

if (if_tag.getAttribute("name")

1047

743

except (AttributeError, xml.dom.DOMException,

1048

744

xml.parsers.expat.ExpatError) as error:

1049

745

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

1050

exc_info=error)

746

error)

1051

747

return xmlstring

1052

748

1053

749

1054

def datetime_to_dbus(dt, variant_level=0):

750

def datetime_to_dbus (dt, variant_level=0):

1055

751

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

1056

752

if dt is None:

1057

753

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

1058

754

return dbus.String(dt.isoformat(),

1059

755

variant_level=variant_level)

1060

756

1061

1062

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1063

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

1064

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

1065

interface names according to the "alt_interface_names" mapping.

1066

Usage:

1067

1068

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

1069

"net.example.AlternateInterface"})

1070

class SampleDBusObject(dbus.service.Object):

1071

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

1072

def SampleDBusMethod():

1073

pass

1074

1075

The above "SampleDBusMethod" on "SampleDBusObject" will be

1076

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

1077

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

1078

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

1079

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

1080

1081

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

1082

(from DBusObjectWithProperties) and interfaces (from the

1083

dbus_interface_annotations decorator).

757

class AlternateDBusNamesMetaclass(DBusObjectWithProperties.__metaclass__):

758

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

759

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

1084

760

"""

1085

def wrapper(cls):

1086

for orig_interface_name, alt_interface_name in (

1087

alt_interface_names.iteritems()):

1088

attr = {}

1089

interface_names = set()

1090

# Go though all attributes of the class

1091

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

761

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

762

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

763

# methods, signals, or properties in them

764

for base in (b for b in bases

765

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

766

# Go though all attributes of the base class

767

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

1092

768

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

1093

769

# with the wrong interface name

1094

770

if (not hasattr(attribute, "_dbus_interface")

1095

771

or not attribute._dbus_interface

1096

.startswith(orig_interface_name)):

772

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

1097

773

continue

1098

774

# Create an alternate D-Bus interface name based on

1099

775

# the current name

1100

776

alt_interface = (attribute._dbus_interface

1101

.replace(orig_interface_name,

1102

alt_interface_name))

1103

interface_names.add(alt_interface)

777

.replace("se.recompile.Mandos",

778

"se.bsnet.fukt.Mandos"))

1104

779

# Is this a D-Bus signal?

1105

780

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

1106

# Extract the original non-method undecorated

1107

# function by black magic

781

# Extract the original non-method function by

782

# black magic

1108

783

nonmethod_func = (dict(

1109

784

zip(attribute.func_code.co_freevars,

1110

785

attribute.__closure__))["func"]

1121

796

nonmethod_func.func_name,

1122

797

nonmethod_func.func_defaults,

1123

798

nonmethod_func.func_closure)))

1124

# Copy annotations, if any

1125

try:

1126

new_function._dbus_annotations = (

1127

dict(attribute._dbus_annotations))

1128

except AttributeError:

1129

pass

1130

799

# Define a creator of a function to call both the

1131

# original and alternate functions, so both the

1132

# original and alternate signals gets sent when

1133

# the function is called

800

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

801

# signals gets sent when the function is called

1134

802

def fixscope(func1, func2):

1135

803

"""This function is a scope container to pass

1136

804

func1 and func2 to the "call_both" function

1143

811

return call_both

1144

812

# Create the "call_both" function and add it to

1145

813

# the class

1146

attr[attrname] = fixscope(attribute, new_function)

814

attr[attrname] = fixscope(attribute,

815

new_function)

1147

816

# Is this a D-Bus method?

1148

817

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

1149

818

# Create a new, but exactly alike, function

1160

829

attribute.func_name,

1161

830

attribute.func_defaults,

1162

831

attribute.func_closure)))

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1169

832

# Is this a D-Bus property?

1170

833

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

1171

834

# Create a new, but exactly alike, function

1185

848

attribute.func_name,

1186

849

attribute.func_defaults,

1187

850

attribute.func_closure)))

1188

# Copy annotations, if any

1189

try:

1190

attr[attrname]._dbus_annotations = (

1191

dict(attribute._dbus_annotations))

1192

except AttributeError:

1193

pass

1194

# Is this a D-Bus interface?

1195

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

1196

# Create a new, but exactly alike, function

1197

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

1198

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

1199

# to the class.

1200

attr[attrname] = (dbus_interface_annotations

1201

(alt_interface)

1202

(types.FunctionType

1203

(attribute.func_code,

1204

attribute.func_globals,

1205

attribute.func_name,

1206

attribute.func_defaults,

1207

attribute.func_closure)))

1208

if deprecate:

1209

# Deprecate all alternate interfaces

1210

iname="_AlternateDBusNames_interface_annotation{0}"

1211

for interface_name in interface_names:

1212

@dbus_interface_annotations(interface_name)

1213

def func(self):

1214

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

1215

"true" }

1216

# Find an unused name

1217

for aname in (iname.format(i)

1218

for i in itertools.count()):

1219

if aname not in attr:

1220

attr[aname] = func

1221

break

1222

if interface_names:

1223

# Replace the class with a new subclass of it with

1224

# methods, signals, etc. as created above.

1225

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

1226

(cls,), attr)

1227

return cls

1228

return wrapper

1229

1230

1231

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

1232

"se.bsnet.fukt.Mandos"})

851

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

852

1233

853

class ClientDBus(Client, DBusObjectWithProperties):

1234

854

"""A Client class using D-Bus

1235

855

1244

864

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

1245

865

1246

866

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

867

self._approvals_pending = 0

1247

868

self.bus = bus

1248

869

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

1249

870

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

1255

876

("/clients/" + client_object_name))

1256

877

DBusObjectWithProperties.__init__(self, self.bus,

1257

878

self.dbus_object_path)

1258

879

1259

880

def notifychangeproperty(transform_func,

1260

881

dbus_name, type_func=lambda x: x,

1261

882

variant_level=1):

1262

883

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

1263

884

its changes to DBus.

1264

1265

transform_fun: Function that takes a value and a variant_level

1266

and transforms it to a D-Bus type.

885

886

transform_fun: Function that takes a value and transforms it

887

to a D-Bus type.

1267

888

dbus_name: D-Bus name of the variable

1268

889

type_func: Function that transform the value before sending it

1269

890

to the D-Bus. Default: no transform

1270

891

variant_level: D-Bus variant level. Default: 1

1271

892

"""

1272

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

893

real_value = [None,]

1273

894

def setter(self, value):

895

old_value = real_value[0]

896

real_value[0] = value

1274

897

if hasattr(self, "dbus_object_path"):

1275

if (not hasattr(self, attrname) or

1276

type_func(getattr(self, attrname, None))

1277

!= type_func(value)):

1278

dbus_value = transform_func(type_func(value),

1279

variant_level

1280

=variant_level)

898

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

899

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

900

variant_level)

1281

901

self.PropertyChanged(dbus.String(dbus_name),

1282

902

dbus_value)

1283

setattr(self, attrname, value)

1284

903

1285

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

904

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

905

1286

906

1287

907

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1288

908

approvals_pending = notifychangeproperty(dbus.Boolean,

1292

912

last_enabled = notifychangeproperty(datetime_to_dbus,

1293

913

"LastEnabled")

1294

914

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

1295

type_func = lambda checker:

1296

checker is not None)

915

type_func = lambda checker: checker is not None)

1297

916

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1298

917

"LastCheckedOK")

1299

last_checker_status = notifychangeproperty(dbus.Int16,

1300

"LastCheckerStatus")

1301

last_approval_request = notifychangeproperty(

1302

datetime_to_dbus, "LastApprovalRequest")

918

last_approval_request = notifychangeproperty(datetime_to_dbus,

919

"LastApprovalRequest")

1303

920

approved_by_default = notifychangeproperty(dbus.Boolean,

1304

921

"ApprovedByDefault")

1305

approval_delay = notifychangeproperty(dbus.UInt64,

1306

"ApprovalDelay",

1307

type_func =

1308

timedelta_to_milliseconds)

1309

approval_duration = notifychangeproperty(

1310

dbus.UInt64, "ApprovalDuration",

1311

type_func = timedelta_to_milliseconds)

922

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

923

type_func = _timedelta_to_milliseconds)

924

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

925

type_func = _timedelta_to_milliseconds)

1312

926

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

1313

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

1314

type_func =

1315

timedelta_to_milliseconds)

1316

extended_timeout = notifychangeproperty(

1317

dbus.UInt64, "ExtendedTimeout",

1318

type_func = timedelta_to_milliseconds)

1319

interval = notifychangeproperty(dbus.UInt64,

1320

"Interval",

1321

type_func =

1322

timedelta_to_milliseconds)

927

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

928

type_func = _timedelta_to_milliseconds)

929

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

930

type_func = _timedelta_to_milliseconds)

931

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

932

type_func = _timedelta_to_milliseconds)

1323

933

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

1324

934

1325

935

del notifychangeproperty

1353

963

*args, **kwargs)

1354

964

1355

965

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

1356

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

966

old_checker = self.checker

967

if self.checker is not None:

968

old_checker_pid = self.checker.pid

969

else:

970

old_checker_pid = None

1357

971

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

1358

972

# Only if new checker process was started

1359

973

if (self.checker is not None

1363

977

return r

1364

978

1365

979

def _reset_approved(self):

1366

self.approved = None

980

self._approved = None

1367

981

return False

1368

982

1369

983

def approve(self, value=True):

1370

self.approved = value

1371

gobject.timeout_add(timedelta_to_milliseconds

984

self.send_changedstate()

985

self._approved = value

986

gobject.timeout_add(_timedelta_to_milliseconds

1372

987

(self.approval_duration),

1373

988

self._reset_approved)

1374

self.send_changedstate()

989

1375

990

1376

991

## D-Bus methods, signals & properties

1377

992

_interface = "se.recompile.Mandos.Client"

1378

993

1379

## Interfaces

1380

1381

@dbus_interface_annotations(_interface)

1382

def _foo(self):

1383

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

1384

"false"}

1385

1386

994

## Signals

1387

995

1388

996

# CheckerCompleted - signal

1487

1095

access="readwrite")

1488

1096

def ApprovalDuration_dbus_property(self, value=None):

1489

1097

if value is None: # get

1490

return dbus.UInt64(timedelta_to_milliseconds(

1098

return dbus.UInt64(_timedelta_to_milliseconds(

1491

1099

self.approval_duration))

1492

1100

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

1493

1101

1507

1115

def Host_dbus_property(self, value=None):

1508

1116

if value is None: # get

1509

1117

return dbus.String(self.host)

1510

self.host = unicode(value)

1118

self.host = value

1511

1119

1512

1120

# Created - property

1513

1121

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

1514

1122

def Created_dbus_property(self):

1515

return datetime_to_dbus(self.created)

1123

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

1516

1124

1517

1125

# LastEnabled - property

1518

1126

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

1539

1147

return

1540

1148

return datetime_to_dbus(self.last_checked_ok)

1541

1149

1542

# LastCheckerStatus - property

1543

@dbus_service_property(_interface, signature="n",

1544

access="read")

1545

def LastCheckerStatus_dbus_property(self):

1546

return dbus.Int16(self.last_checker_status)

1547

1548

1150

# Expires - property

1549

1151

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

1550

1152

def Expires_dbus_property(self):

1561

1163

def Timeout_dbus_property(self, value=None):

1562

1164

if value is None: # get

1563

1165

return dbus.UInt64(self.timeout_milliseconds())

1564

old_timeout = self.timeout

1565

1166

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

1566

# Reschedule disabling

1567

if self.enabled:

1568

now = datetime.datetime.utcnow()

1569

self.expires += self.timeout - old_timeout

1570

if self.expires <= now:

1571

# The timeout has passed

1572

self.disable()

1573

else:

1574

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

1575

is None):

1576

return

1577

gobject.source_remove(self.disable_initiator_tag)

1578

self.disable_initiator_tag = (

1579

gobject.timeout_add(

1580

timedelta_to_milliseconds(self.expires - now),

1581

self.disable))

1167

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

1168

return

1169

# Reschedule timeout

1170

gobject.source_remove(self.disable_initiator_tag)

1171

self.disable_initiator_tag = None

1172

self.expires = None

1173

time_to_die = (self.

1174

_timedelta_to_milliseconds((self

1175

.last_checked_ok

1176

+ self.timeout)

1177

- datetime.datetime

1178

.utcnow()))

1179

if time_to_die <= 0:

1180

# The timeout has passed

1181

self.disable()

1182

else:

1183

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

1184

+ datetime.timedelta(milliseconds = time_to_die))

1185

self.disable_initiator_tag = (gobject.timeout_add

1186

(time_to_die, self.disable))

1582

1187

1583

1188

# ExtendedTimeout - property

1584

1189

@dbus_service_property(_interface, signature="t",

1597

1202

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

1598

1203

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

1599

1204

return

1600

if self.enabled:

1601

# Reschedule checker run

1602

gobject.source_remove(self.checker_initiator_tag)

1603

self.checker_initiator_tag = (gobject.timeout_add

1604

(value, self.start_checker))

1605

self.start_checker() # Start one now, too

1205

# Reschedule checker run

1206

gobject.source_remove(self.checker_initiator_tag)

1207

self.checker_initiator_tag = (gobject.timeout_add

1208

(value, self.start_checker))

1209

self.start_checker() # Start one now, too

1606

1210

1607

1211

# Checker - property

1608

1212

@dbus_service_property(_interface, signature="s",

1610

1214

def Checker_dbus_property(self, value=None):

1611

1215

if value is None: # get

1612

1216

return dbus.String(self.checker_command)

1613

self.checker_command = unicode(value)

1217

self.checker_command = value

1614

1218

1615

1219

# CheckerRunning - property

1616

1220

@dbus_service_property(_interface, signature="b",

1645

1249

raise KeyError()

1646

1250

1647

1251

def __getattribute__(self, name):

1648

if name == '_pipe':

1252

if(name == '_pipe'):

1649

1253

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

1650

1254

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

1651

1255

data = self._pipe.recv()

1658

1262

return func

1659

1263

1660

1264

def __setattr__(self, name, value):

1661

if name == '_pipe':

1265

if(name == '_pipe'):

1662

1266

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

1663

1267

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

1664

1268

1269

class ClientDBusTransitional(ClientDBus):

1270

__metaclass__ = AlternateDBusNamesMetaclass

1665

1271

1666

1272

class ClientHandler(socketserver.BaseRequestHandler, object):

1667

1273

"""A class to handle client connections.

1704

1310

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

1705

1311

try:

1706

1312

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

1707

raise RuntimeError(line)

1313

raise RuntimeError

1708

1314

except (ValueError, IndexError, RuntimeError) as error:

1709

1315

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

1710

1316

return

1747

1353

client.name)

1748

1354

if self.server.use_dbus:

1749

1355

# Emit D-Bus signal

1750

client.Rejected("Disabled")

1356

client.Rejected("Disabled")

1751

1357

return

1752

1358

1753

if client.approved or not client.approval_delay:

1359

if client._approved or not client.approval_delay:

1754

1360

#We are approved or approval is disabled

1755

1361

break

1756

elif client.approved is None:

1362

elif client._approved is None:

1757

1363

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

1758

1364

client.name)

1759

1365

if self.server.use_dbus:

1770

1376

return

1771

1377

1772

1378

#wait until timeout or approved

1379

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

1773

1380

time = datetime.datetime.now()

1774

1381

client.changedstate.acquire()

1775

client.changedstate.wait(

1776

float(timedelta_to_milliseconds(delay)

1777

/ 1000))

1382

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

1778

1383

client.changedstate.release()

1779

1384

time2 = datetime.datetime.now()

1780

1385

if (time2 - time) >= delay:

1796

1401

try:

1797

1402

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

1798

1403

except gnutls.errors.GNUTLSError as error:

1799

logger.warning("gnutls send failed",

1800

exc_info=error)

1404

logger.warning("gnutls send failed")

1801

1405

return

1802

1406

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

1803

1407

sent, len(client.secret)

1805

1409

sent_size += sent

1806

1410

1807

1411

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

1808

# bump the timeout using extended_timeout

1809

client.bump_timeout(client.extended_timeout)

1412

# bump the timeout as if seen

1413

client.checked_ok(client.extended_timeout)

1810

1414

if self.server.use_dbus:

1811

1415

# Emit D-Bus signal

1812

1416

client.GotSecret()

1817

1421

try:

1818

1422

session.bye()

1819

1423

except gnutls.errors.GNUTLSError as error:

1820

logger.warning("GnuTLS bye failed",

1821

exc_info=error)

1424

logger.warning("GnuTLS bye failed")

1822

1425

1823

1426

@staticmethod

1824

1427

def peer_certificate(session):

1880

1483

# Convert the buffer to a Python bytestring

1881

1484

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

1882

1485

# Convert the bytestring to hexadecimal notation

1883

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

1486

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

1884

1487

return hex_fpr

1885

1488

1886

1489

1889

1492

def sub_process_main(self, request, address):

1890

1493

try:

1891

1494

self.finish_request(request, address)

1892

except Exception:

1495

except:

1893

1496

self.handle_error(request, address)

1894

1497

self.close_request(request)

1895

1498

1896

1499

def process_request(self, request, address):

1897

1500

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

1898

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

1899

args = (request, address))

1900

proc.start()

1901

return proc

1501

multiprocessing.Process(target = self.sub_process_main,

1502

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

1902

1503

1903

1504

1904

1505

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1910

1511

"""

1911

1512

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1912

1513

1913

proc = MultiprocessingMixIn.process_request(self, request,

1914

client_address)

1514

super(MultiprocessingMixInWithPipe,

1515

self).process_request(request, client_address)

1915

1516

self.child_pipe.close()

1916

self.add_pipe(parent_pipe, proc)

1517

self.add_pipe(parent_pipe)

1917

1518

1918

def add_pipe(self, parent_pipe, proc):

1519

def add_pipe(self, parent_pipe):

1919

1520

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

1920

raise NotImplementedError()

1521

raise NotImplementedError

1921

1522

1922

1523

1923

1524

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1930

1531

use_ipv6: Boolean; to use IPv6 or not

1931

1532

"""

1932

1533

def __init__(self, server_address, RequestHandlerClass,

1933

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

1934

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

1935

creating a new one with socket.socket().

1936

"""

1534

interface=None, use_ipv6=True):

1937

1535

self.interface = interface

1938

1536

if use_ipv6:

1939

1537

self.address_family = socket.AF_INET6

1940

if socketfd is not None:

1941

# Save the file descriptor

1942

self.socketfd = socketfd

1943

# Save the original socket.socket() function

1944

self.socket_socket = socket.socket

1945

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

1946

#

1947

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

1948

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

1949

# patching socket.socket.)

1950

#

1951

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

1952

@functools.wraps(socket.socket)

1953

def socket_wrapper(*args, **kwargs):

1954

# Restore original function so subsequent calls are

1955

# not affected.

1956

socket.socket = self.socket_socket

1957

del self.socket_socket

1958

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

1959

# saved file descriptor.

1960

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

1961

# Replace socket.socket() function with wrapper

1962

socket.socket = socket_wrapper

1963

# The socketserver.TCPServer.__init__ will call

1964

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

1965

# socket_wrapper(), if socketfd was set.

1966

1538

socketserver.TCPServer.__init__(self, server_address,

1967

1539

RequestHandlerClass)

1968

1969

1540

def server_bind(self):

1970

1541

"""This overrides the normal server_bind() function

1971

1542

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

1979

1550

try:

1980

1551

self.socket.setsockopt(socket.SOL_SOCKET,

1981

1552

SO_BINDTODEVICE,

1982

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

1553

str(self.interface

1554

+ '\0'))

1983

1555

except socket.error as error:

1984

if error.errno == errno.EPERM:

1985

logger.error("No permission to bind to"

1986

" interface %s", self.interface)

1987

elif error.errno == errno.ENOPROTOOPT:

1556

if error[0] == errno.EPERM:

1557

logger.error("No permission to"

1558

" bind to interface %s",

1559

self.interface)

1560

elif error[0] == errno.ENOPROTOOPT:

1988

1561

logger.error("SO_BINDTODEVICE not available;"

1989

1562

" cannot bind to interface %s",

1990

1563

self.interface)

1991

elif error.errno == errno.ENODEV:

1992

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

1993

" cannot bind", self.interface)

1994

1564

else:

1995

1565

raise

1996

1566

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

1999

1569

if self.address_family == socket.AF_INET6:

2000

1570

any_address = "::" # in6addr_any

2001

1571

else:

2002

any_address = "0.0.0.0" # INADDR_ANY

1572

any_address = socket.INADDR_ANY

2003

1573

self.server_address = (any_address,

2004

1574

self.server_address[1])

2005

1575

elif not self.server_address[1]:

2026

1596

"""

2027

1597

def __init__(self, server_address, RequestHandlerClass,

2028

1598

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

2029

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

1599

gnutls_priority=None, use_dbus=True):

2030

1600

self.enabled = False

2031

1601

self.clients = clients

2032

1602

if self.clients is None:

2033

self.clients = {}

1603

self.clients = set()

2034

1604

self.use_dbus = use_dbus

2035

1605

self.gnutls_priority = gnutls_priority

2036

1606

IPv6_TCPServer.__init__(self, server_address,

2037

1607

RequestHandlerClass,

2038

1608

interface = interface,

2039

use_ipv6 = use_ipv6,

2040

socketfd = socketfd)

1609

use_ipv6 = use_ipv6)

2041

1610

def server_activate(self):

2042

1611

if self.enabled:

2043

1612

return socketserver.TCPServer.server_activate(self)

2044

2045

1613

def enable(self):

2046

1614

self.enabled = True

2047

2048

def add_pipe(self, parent_pipe, proc):

1615

def add_pipe(self, parent_pipe):

2049

1616

# Call "handle_ipc" for both data and EOF events

2050

1617

gobject.io_add_watch(parent_pipe.fileno(),

2051

1618

gobject.IO_IN | gobject.IO_HUP,

2052

1619

functools.partial(self.handle_ipc,

2053

parent_pipe =

2054

parent_pipe,

2055

proc = proc))

2056

1620

parent_pipe = parent_pipe))

1621

2057

1622

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

2058

proc = None, client_object=None):

2059

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

2060

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

2061

# Wait for other process to exit

2062

proc.join()

1623

client_object=None):

1624

condition_names = {

1625

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

1626

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

1627

# blocking).

1628

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

1629

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

1630

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

1631

# broken, usually for pipes and

1632

# sockets).

1633

}

1634

conditions_string = ' | '.join(name

1635

for cond, name in

1636

condition_names.iteritems()

1637

if cond & condition)

1638

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

1639

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

2063

1640

return False

2064

1641

2065

1642

# Read a request from the child

2070

1647

fpr = request[1]

2071

1648

address = request[2]

2072

1649

2073

for c in self.clients.itervalues():

1650

for c in self.clients:

2074

1651

if c.fingerprint == fpr:

2075

1652

client = c

2076

1653

break

2079

1656

"dress: %s", fpr, address)

2080

1657

if self.use_dbus:

2081

1658

# Emit D-Bus signal

2082

mandos_dbus_service.ClientNotFound(fpr,

2083

address[0])

1659

mandos_dbus_service.ClientNotFound(fpr, address[0])

2084

1660

parent_pipe.send(False)

2085

1661

return False

2086

1662

2087

1663

gobject.io_add_watch(parent_pipe.fileno(),

2088

1664

gobject.IO_IN | gobject.IO_HUP,

2089

1665

functools.partial(self.handle_ipc,

2090

parent_pipe =

2091

parent_pipe,

2092

proc = proc,

2093

client_object =

2094

client))

1666

parent_pipe = parent_pipe,

1667

client_object = client))

2095

1668

parent_pipe.send(True)

2096

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

2097

# same fileno

1669

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

2098

1670

return False

2099

1671

if command == 'funcall':

2100

1672

funcname = request[1]

2101

1673

args = request[2]

2102

1674

kwargs = request[3]

2103

1675

2104

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

2105

funcname)(*args,

2106

**kwargs)))

1676

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

2107

1677

2108

1678

if command == 'getattr':

2109

1679

attrname = request[1]

2110

1680

if callable(client_object.__getattribute__(attrname)):

2111

1681

parent_pipe.send(('function',))

2112

1682

else:

2113

parent_pipe.send(('data', client_object

2114

.__getattribute__(attrname)))

1683

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

2115

1684

2116

1685

if command == 'setattr':

2117

1686

attrname = request[1]

2121

1690

return True

2122

1691

2123

1692

2124

def rfc3339_duration_to_delta(duration):

2125

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

2126

2127

>>> rfc3339_duration_to_delta("P7D")

2128

datetime.timedelta(7)

2129

>>> rfc3339_duration_to_delta("PT60S")

2130

datetime.timedelta(0, 60)

2131

>>> rfc3339_duration_to_delta("PT60M")

2132

datetime.timedelta(0, 3600)

2133

>>> rfc3339_duration_to_delta("PT24H")

2134

datetime.timedelta(1)

2135

>>> rfc3339_duration_to_delta("P1W")

2136

datetime.timedelta(7)

2137

>>> rfc3339_duration_to_delta("PT5M30S")

2138

datetime.timedelta(0, 330)

2139

>>> rfc3339_duration_to_delta("P1DT3M20S")

2140

datetime.timedelta(1, 200)

2141

"""

2142

2143

# Parsing an RFC 3339 duration with regular expressions is not

2144

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

2145

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

2146

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

2147

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

2148

# avoid excessive use of external libraries.

2149

2150

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

2151

Token = collections.namedtuple("Token",

2152

("regexp", # To match token; if

2153

# "value" is not None,

2154

# must have a "group"

2155

# containing digits

2156

"value", # datetime.timedelta or

2157

# None

2158

"followers")) # Tokens valid after

2159

# this token

2160

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

2161

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

2162

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

2163

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

2164

datetime.timedelta(seconds=1),

2165

frozenset((token_end,)))

2166

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

2167

datetime.timedelta(minutes=1),

2168

frozenset((token_second, token_end)))

2169

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

2170

datetime.timedelta(hours=1),

2171

frozenset((token_minute, token_end)))

2172

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

2173

None,

2174

frozenset((token_hour, token_minute,

2175

token_second)))

2176

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

2177

datetime.timedelta(days=1),

2178

frozenset((token_time, token_end)))

2179

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

2180

datetime.timedelta(weeks=4),

2181

frozenset((token_day, token_end)))

2182

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

2183

datetime.timedelta(weeks=52),

2184

frozenset((token_month, token_end)))

2185

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

2186

datetime.timedelta(weeks=1),

2187

frozenset((token_end,)))

2188

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

2189

frozenset((token_year, token_month,

2190

token_day, token_time,

2191

token_week))),

2192

# Define starting values

2193

value = datetime.timedelta() # Value so far

2194

found_token = None

2195

followers = frozenset(token_duration,) # Following valid tokens

2196

s = duration # String left to parse

2197

# Loop until end token is found

2198

while found_token is not token_end:

2199

# Search for any currently valid tokens

2200

for token in followers:

2201

match = token.regexp.match(s)

2202

if match is not None:

2203

# Token found

2204

if token.value is not None:

2205

# Value found, parse digits

2206

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

2207

# Add to value so far

2208

value += factor * token.value

2209

# Strip token from string

2210

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

2211

# Go to found token

2212

found_token = token

2213

# Set valid next tokens

2214

followers = found_token.followers

2215

break

2216

else:

2217

# No currently valid tokens were found

2218

raise ValueError("Invalid RFC 3339 duration")

2219

# End token found

2220

return value

2221

2222

2223

1693

def string_to_delta(interval):

2224

1694

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

2225

1695

2236

1706

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

2237

1707

datetime.timedelta(0, 330)

2238

1708

"""

2239

2240

try:

2241

return rfc3339_duration_to_delta(interval)

2242

except ValueError:

2243

pass

2244

2245

1709

timevalue = datetime.timedelta(0)

2246

1710

for s in interval.split():

2247

1711

try:

2258

1722

elif suffix == "w":

2259

1723

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

2260

1724

else:

2261

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

2262

.format(suffix))

2263

except IndexError as e:

1725

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

1726

except (ValueError, IndexError) as e:

2264

1727

raise ValueError(*(e.args))

2265

1728

timevalue += delta

2266

1729

return timevalue

2267

1730

2268

1731

1732

def if_nametoindex(interface):

1733

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

1734

1735

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

1736

global if_nametoindex

1737

try:

1738

if_nametoindex = (ctypes.cdll.LoadLibrary

1739

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

1740

.if_nametoindex)

1741

except (OSError, AttributeError):

1742

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

1743

def if_nametoindex(interface):

1744

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

1745

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

1746

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

1747

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1748

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

1749

interface))

1750

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

1751

ifreq[16:20])[0]

1752

return interface_index

1753

return if_nametoindex(interface)

1754

1755

2269

1756

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

2270

1757

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

2271

1758

2279

1766

sys.exit()

2280

1767

if not noclose:

2281

1768

# Close all standard open file descriptors

2282

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

1769

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

2283

1770

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

2284

1771

raise OSError(errno.ENODEV,

2285

"{0} not a character device"

2286

.format(os.devnull))

1772

"%s not a character device"

1773

% os.path.devnull)

2287

1774

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

2288

1775

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

2289

1776

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

2298

1785

2299

1786

parser = argparse.ArgumentParser()

2300

1787

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

2301

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

1788

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

2302

1789

help="show version number and exit")

2303

1790

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

2304

1791

help="Bind to interface IF")

2310

1797

help="Run self-test")

2311

1798

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

2312

1799

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

2313

" to terminal", default=None)

1800

" to terminal")

2314

1801

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

2315

1802

help="Debug level for stdout output")

2316

1803

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

2323

1810

" files")

2324

1811

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

2325

1812

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

2326

" system bus interface", default=None)

1813

" system bus interface")

2327

1814

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

2328

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

2329

default=None)

2330

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

2331

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

2332

" state", default=None)

2333

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

2334

help="Specify a file descriptor to a network"

2335

" socket to use instead of creating one")

2336

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

2337

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

2338

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

2339

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

2340

1815

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

2341

1816

options = parser.parse_args()

2342

1817

2343

1818

if options.check:

2344

1819

import doctest

2345

fail_count, test_count = doctest.testmod()

2346

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

1820

doctest.testmod()

1821

sys.exit()

2347

1822

2348

1823

# Default values for config file for server-global settings

2349

1824

server_defaults = { "interface": "",

2351

1826

"port": "",

2352

1827

"debug": "False",

2353

1828

"priority":

2354

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

1829

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

2355

1830

"servicename": "Mandos",

2356

1831

"use_dbus": "True",

2357

1832

"use_ipv6": "True",

2358

1833

"debuglevel": "",

2359

"restore": "True",

2360

"socket": "",

2361

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

2362

"foreground": "False",

2363

1834

}

2364

1835

2365

1836

# Parse config file for server-global settings

2370

1841

# Convert the SafeConfigParser object to a dict

2371

1842

server_settings = server_config.defaults()

2372

1843

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

2373

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

1844

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

2374

1845

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

2375

1846

option)

2376

1847

if server_settings["port"]:

2377

1848

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

2378

1849

"port")

2379

if server_settings["socket"]:

2380

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

2381

"socket")

2382

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

2383

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

2384

# happen with a supplied network socket.

2385

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

2386

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

2387

["socket"])

2388

1850

del server_config

2389

1851

2390

1852

# Override the settings from the config file with command line

2391

1853

# options, if set.

2392

1854

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

2393

1855

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

2394

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

2395

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

1856

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

2396

1857

value = getattr(options, option)

2397

1858

if value is not None:

2398

1859

server_settings[option] = value

2401

1862

for option in server_settings.keys():

2402

1863

if type(server_settings[option]) is str:

2403

1864

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

2404

# Force all boolean options to be boolean

2405

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

2406

"foreground"):

2407

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

2408

# Debug implies foreground

2409

if server_settings["debug"]:

2410

server_settings["foreground"] = True

2411

1865

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

2412

1866

2413

1867

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

2417

1871

debuglevel = server_settings["debuglevel"]

2418

1872

use_dbus = server_settings["use_dbus"]

2419

1873

use_ipv6 = server_settings["use_ipv6"]

2420

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

2421

stored_state_file)

2422

foreground = server_settings["foreground"]

2423

2424

if debug:

2425

initlogger(debug, logging.DEBUG)

2426

else:

2427

if not debuglevel:

2428

initlogger(debug)

2429

else:

2430

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

2431

initlogger(debug, level)

2432

1874

2433

1875

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

2434

1876

syslogger.setFormatter(logging.Formatter

2435

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

2436

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

2437

.format(server_settings

2438

["servicename"])))

1877

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

1878

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

1879

% server_settings["servicename"]))

2439

1880

2440

1881

# Parse config file with clients

2441

client_config = configparser.SafeConfigParser(Client

2442

.client_defaults)

1882

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

1883

"extended_timeout": "15m",

1884

"interval": "2m",

1885

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

1886

"host": "",

1887

"approval_delay": "0s",

1888

"approval_duration": "1s",

1889

}

1890

client_config = configparser.SafeConfigParser(client_defaults)

2443

1891

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

2444

1892

"clients.conf"))

2445

1893

2454

1902

use_ipv6=use_ipv6,

2455

1903

gnutls_priority=

2456

1904

server_settings["priority"],

2457

use_dbus=use_dbus,

2458

socketfd=(server_settings["socket"]

2459

or None))

2460

if not foreground:

2461

pidfilename = "/run/mandos.pid"

2462

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

2463

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

2464

pidfile = None

1905

use_dbus=use_dbus)

1906

if not debug:

1907

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

2465

1908

try:

2466

1909

pidfile = open(pidfilename, "w")

2467

except IOError as e:

2468

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

2469

exc_info=e)

1910

except IOError:

1911

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

2470

1912

2471

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

1913

try:

1914

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

1915

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

1916

except KeyError:

2472

1917

try:

2473

uid = pwd.getpwnam(name).pw_uid

2474

gid = pwd.getpwnam(name).pw_gid

2475

break

1918

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

1919

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

2476

1920

except KeyError:

2477

continue

2478

else:

2479

uid = 65534

2480

gid = 65534

1921

try:

1922

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

1923

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

1924

except KeyError:

1925

uid = 65534

1926

gid = 65534

2481

1927

try:

2482

1928

os.setgid(gid)

2483

1929

os.setuid(uid)

2484

1930

except OSError as error:

2485

if error.errno != errno.EPERM:

2486

raise

1931

if error[0] != errno.EPERM:

1932

raise error

1933

1934

if not debug and not debuglevel:

1935

syslogger.setLevel(logging.WARNING)

1936

console.setLevel(logging.WARNING)

1937

if debuglevel:

1938

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

1939

syslogger.setLevel(level)

1940

console.setLevel(level)

2487

1941

2488

1942

if debug:

2489

1943

# Enable all possible GnuTLS debugging

2500

1954

.gnutls_global_set_log_function(debug_gnutls))

2501

1955

2502

1956

# Redirect stdin so all checkers get /dev/null

2503

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

1957

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

2504

1958

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

2505

1959

if null > 2:

2506

1960

os.close(null)

1961

else:

1962

# No console logging

1963

logger.removeHandler(console)

2507

1964

2508

1965

# Need to fork before connecting to D-Bus

2509

if not foreground:

1966

if not debug:

2510

1967

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

2511

1968

daemon()

2512

1969

2513

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

2514

# need to inform gobject that threads will be used.

2515

gobject.threads_init()

2516

2517

1970

global main_loop

2518

1971

# From the Avahi example code

2519

DBusGMainLoop(set_as_default=True)

1972

DBusGMainLoop(set_as_default=True )

2520

1973

main_loop = gobject.MainLoop()

2521

1974

bus = dbus.SystemBus()

2522

1975

# End of Avahi example code

2524

1977

try:

2525

1978

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

2526

1979

bus, do_not_queue=True)

2527

old_bus_name = (dbus.service.BusName

2528

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

2529

do_not_queue=True))

1980

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

1981

bus, do_not_queue=True)

2530

1982

except dbus.exceptions.NameExistsException as e:

2531

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

1983

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

2532

1984

use_dbus = False

2533

1985

server_settings["use_dbus"] = False

2534

1986

tcp_server.use_dbus = False

2535

1987

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2536

service = AvahiServiceToSyslog(name =

2537

server_settings["servicename"],

2538

servicetype = "_mandos._tcp",

2539

protocol = protocol, bus = bus)

1988

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

1989

servicetype = "_mandos._tcp",

1990

protocol = protocol, bus = bus)

2540

1991

if server_settings["interface"]:

2541

1992

service.interface = (if_nametoindex

2542

1993

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

2546

1997

2547

1998

client_class = Client

2548

1999

if use_dbus:

2549

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

2550

2551

client_settings = Client.config_parser(client_config)

2552

old_client_settings = {}

2553

clients_data = {}

2554

2555

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

2556

global wnull

2557

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

2558

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

2559

# mode

2560

if debug or not foreground:

2561

wnull.close()

2562

2563

# Get client data and settings from last running state.

2564

if server_settings["restore"]:

2565

try:

2566

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

2567

clients_data, old_client_settings = (pickle.load

2568

(stored_state))

2569

os.remove(stored_state_path)

2570

except IOError as e:

2571

if e.errno == errno.ENOENT:

2572

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

2573

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

2574

else:

2575

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

2576

exc_info=e)

2577

raise

2578

except EOFError as e:

2579

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

2580

"EOFError:", exc_info=e)

2581

2582

with PGPEngine() as pgp:

2583

for client_name, client in clients_data.iteritems():

2584

# Skip removed clients

2585

if client_name not in client_settings:

2586

continue

2587

2588

# Decide which value to use after restoring saved state.

2589

# We have three different values: Old config file,

2590

# new config file, and saved state.

2591

# New config value takes precedence if it differs from old

2592

# config value, otherwise use saved state.

2593

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

2594

try:

2595

# For each value in new config, check if it

2596

# differs from the old config value (Except for

2597

# the "secret" attribute)

2598

if (name != "secret" and

2599

value != old_client_settings[client_name]

2600

[name]):

2601

client[name] = value

2602

except KeyError:

2603

pass

2604

2605

# Clients who has passed its expire date can still be

2606

# enabled if its last checker was successful. Clients

2607

# whose checker succeeded before we stored its state is

2608

# assumed to have successfully run all checkers during

2609

# downtime.

2610

if client["enabled"]:

2611

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

2612

if not client["last_checked_ok"]:

2613

logger.warning(

2614

"disabling client {0} - Client never "

2615

"performed a successful checker"

2616

.format(client_name))

2617

client["enabled"] = False

2618

elif client["last_checker_status"] != 0:

2619

logger.warning(

2620

"disabling client {0} - Client "

2621

"last checker failed with error code {1}"

2622

.format(client_name,

2623

client["last_checker_status"]))

2624

client["enabled"] = False

2625

else:

2626

client["expires"] = (datetime.datetime

2627

.utcnow()

2628

+ client["timeout"])

2629

logger.debug("Last checker succeeded,"

2630

" keeping {0} enabled"

2631

.format(client_name))

2000

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

2001

def client_config_items(config, section):

2002

special_settings = {

2003

"approved_by_default":

2004

lambda: config.getboolean(section,

2005

"approved_by_default"),

2006

}

2007

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

2632

2008

try:

2633

client["secret"] = (

2634

pgp.decrypt(client["encrypted_secret"],

2635

client_settings[client_name]

2636

["secret"]))

2637

except PGPError:

2638

# If decryption fails, we use secret from new settings

2639

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

2640

.format(client_name))

2641

client["secret"] = (

2642

client_settings[client_name]["secret"])

2643

2644

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

2645

for client_name in (set(old_client_settings)

2646

- set(client_settings)):

2647

del clients_data[client_name]

2648

for client_name in (set(client_settings)

2649

- set(old_client_settings)):

2650

clients_data[client_name] = client_settings[client_name]

2651

2652

# Create all client objects

2653

for client_name, client in clients_data.iteritems():

2654

tcp_server.clients[client_name] = client_class(

2655

name = client_name, settings = client,

2656

server_settings = server_settings)

2657

2009

yield (name, special_settings[name]())

2010

except KeyError:

2011

yield (name, value)

2012

2013

tcp_server.clients.update(set(

2014

client_class(name = section,

2015

config= dict(client_config_items(

2016

client_config, section)))

2017

for section in client_config.sections()))

2658

2018

if not tcp_server.clients:

2659

2019

logger.warning("No clients defined")

2660

2661

if not foreground:

2662

if pidfile is not None:

2663

try:

2664

with pidfile:

2665

pid = os.getpid()

2666

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

2667

except IOError:

2668

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

2669

pidfilename, pid)

2670

del pidfile

2020

2021

if not debug:

2022

try:

2023

with pidfile:

2024

pid = os.getpid()

2025

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

2026

del pidfile

2027

except IOError:

2028

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

2029

pidfilename, pid)

2030

except NameError:

2031

# "pidfile" was never created

2032

pass

2671

2033

del pidfilename

2034

2035

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

2672

2036

2673

2037

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

2674

2038

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

2675

2039

2676

2040

if use_dbus:

2677

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

2678

"se.bsnet.fukt.Mandos"})

2679

class MandosDBusService(DBusObjectWithProperties):

2041

class MandosDBusService(dbus.service.Object):

2680

2042

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

2681

2043

def __init__(self):

2682

2044

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

2683

2045

_interface = "se.recompile.Mandos"

2684

2046

2685

@dbus_interface_annotations(_interface)

2686

def _foo(self):

2687

return { "org.freedesktop.DBus.Property"

2688

".EmitsChangedSignal":

2689

"false"}

2690

2691

2047

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

2692

2048

def ClientAdded(self, objpath):

2693

2049

"D-Bus signal"

2707

2063

def GetAllClients(self):

2708

2064

"D-Bus method"

2709

2065

return dbus.Array(c.dbus_object_path

2710

for c in

2711

tcp_server.clients.itervalues())

2066

for c in tcp_server.clients)

2712

2067

2713

2068

@dbus.service.method(_interface,

2714

2069

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

2716

2071

"D-Bus method"

2717

2072

return dbus.Dictionary(

2718

2073

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

2719

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

2074

for c in tcp_server.clients),

2720

2075

signature="oa{sv}")

2721

2076

2722

2077

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

2723

2078

def RemoveClient(self, object_path):

2724

2079

"D-Bus method"

2725

for c in tcp_server.clients.itervalues():

2080

for c in tcp_server.clients:

2726

2081

if c.dbus_object_path == object_path:

2727

del tcp_server.clients[c.name]

2082

tcp_server.clients.remove(c)

2728

2083

c.remove_from_connection()

2729

2084

# Don't signal anything except ClientRemoved

2730

2085

c.disable(quiet=True)

2735

2090

2736

2091

del _interface

2737

2092

2738

mandos_dbus_service = MandosDBusService()

2093

class MandosDBusServiceTransitional(MandosDBusService):

2094

__metaclass__ = AlternateDBusNamesMetaclass

2095

mandos_dbus_service = MandosDBusServiceTransitional()

2739

2096

2740

2097

def cleanup():

2741

2098

"Cleanup function; run on exit"

2742

2099

service.cleanup()

2743

2100

2744

multiprocessing.active_children()

2745

wnull.close()

2746

if not (tcp_server.clients or client_settings):

2747

return

2748

2749

# Store client before exiting. Secrets are encrypted with key

2750

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

2751

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

2752

clients = {}

2753

with PGPEngine() as pgp:

2754

for client in tcp_server.clients.itervalues():

2755

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

2756

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

2757

key)

2758

client_dict = {}

2759

2760

# A list of attributes that can not be pickled

2761

# + secret.

2762

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

2763

"checker", "server_settings"))

2764

for name, typ in (inspect.getmembers

2765

(dbus.service.Object)):

2766

exclude.add(name)

2767

2768

client_dict["encrypted_secret"] = (client

2769

.encrypted_secret)

2770

for attr in client.client_structure:

2771

if attr not in exclude:

2772

client_dict[attr] = getattr(client, attr)

2773

2774

clients[client.name] = client_dict

2775

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

2776

2777

try:

2778

with (tempfile.NamedTemporaryFile

2779

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

2780

dir=os.path.dirname(stored_state_path),

2781

delete=False)) as stored_state:

2782

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

2783

tempname=stored_state.name

2784

os.rename(tempname, stored_state_path)

2785

except (IOError, OSError) as e:

2786

if not debug:

2787

try:

2788

os.remove(tempname)

2789

except NameError:

2790

pass

2791

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

2792

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

2793

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

2794

else:

2795

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

2796

exc_info=e)

2797

raise

2798

2799

# Delete all clients, and settings from config

2800

2101

while tcp_server.clients:

2801

name, client = tcp_server.clients.popitem()

2102

client = tcp_server.clients.pop()

2802

2103

if use_dbus:

2803

2104

client.remove_from_connection()

2105

client.disable_hook = None

2804

2106

# Don't signal anything except ClientRemoved

2805

2107

client.disable(quiet=True)

2806

2108

if use_dbus:

2807

2109

# Emit D-Bus signal

2808

mandos_dbus_service.ClientRemoved(client

2809

.dbus_object_path,

2110

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2810

2111

client.name)

2811

client_settings.clear()

2812

2112

2813

2113

atexit.register(cleanup)

2814

2114

2815

for client in tcp_server.clients.itervalues():

2115

for client in tcp_server.clients:

2816

2116

if use_dbus:

2817

2117

# Emit D-Bus signal

2818

2118

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2819

# Need to initiate checking of clients

2820

if client.enabled:

2821

client.init_checker()

2119

client.enable()

2822

2120

2823

2121

tcp_server.enable()

2824

2122

tcp_server.server_activate()

2827

2125

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

2828

2126

if use_ipv6:

2829

2127

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

2830

" flowinfo %d, scope_id %d",

2831

*tcp_server.socket.getsockname())

2128

" flowinfo %d, scope_id %d"

2129

% tcp_server.socket.getsockname())

2832

2130

else: # IPv4

2833

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

2834

*tcp_server.socket.getsockname())

2131

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

2132

% tcp_server.socket.getsockname())

2835

2133

2836

2134

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

2837

2135

2840

2138

try:

2841

2139

service.activate()

2842

2140

except dbus.exceptions.DBusException as error:

2843

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

2141

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

2844

2142

cleanup()

2845

2143

sys.exit(1)

2846

2144

# End of Avahi example code

2853

2151

logger.debug("Starting main loop")

2854

2152

main_loop.run()

2855

2153

except AvahiError as error:

2856

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

2154

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

2857

2155

cleanup()

2858

2156

sys.exit(1)

2859

2157

except KeyboardInterrupt:

2864

2162

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

2865

2163

cleanup()

2866

2164

2165

2867

2166

if __name__ == '__main__':

2868

2167

main()