/mandos/trunk : revision 505.1.13

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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 = "1.6.4"

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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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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 = "1.4.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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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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.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

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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if config is None:

340

config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

555

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

348

if "secret" in config:

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

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elif "secfile" in config:

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

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(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

355

else:

356

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

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% self.name)

358

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

359

self.created = datetime.datetime.utcnow()

360

self.enabled = False

361

self.last_approval_request = None

362

self.last_enabled = None

363

self.last_checked_ok = None

364

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

365

self.extended_timeout = string_to_delta(config

366

["extended_timeout"])

367

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

368

self.disable_hook = disable_hook

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self.checker = None

561

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self.checker_initiator_tag = None

562

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self.disable_initiator_tag = None

372

self.expires = None

563

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self.checker_callback_tag = None

374

self.checker_command = config["checker"]

564

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self.current_checker_command = None

565

self.approved = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

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self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

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.Condition(multiprocessing_manager

569

387

.Lock()))

570

self.client_structure = [attr for attr in

571

self.__dict__.iterkeys()

572

if not attr.startswith("_")]

573

self.client_structure.append("client_structure")

574

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

576

lambda obj:

577

isinstance(obj,

578

property)):

579

if not name.startswith("_"):

580

self.client_structure.append(name)

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# Send notice to process children that client state has changed

583

389

def send_changedstate(self):

584

with self.changedstate:

585

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

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def enable(self):

588

395

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

589

396

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

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# Already enabled

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return

399

self.send_changedstate()

400

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

401

# and every interval from then on.

402

self.checker_initiator_tag = (gobject.timeout_add

403

(self.interval_milliseconds(),

404

self.start_checker))

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

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

407

self.disable_initiator_tag = (gobject.timeout_add

408

(self.timeout_milliseconds(),

409

self.disable))

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

595

self.init_checker()

596

self.send_changedstate()

412

# Also start a new checker *right now*.

413

self.start_checker()

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def disable(self, quiet=True):

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"""Disable this client."""

600

417

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

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return False

602

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if not quiet:

420

self.send_changedstate()

421

if not quiet:

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

604

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

423

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

605

424

gobject.source_remove(self.disable_initiator_tag)

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425

self.disable_initiator_tag = None

607

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self.expires = None

608

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

427

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

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428

gobject.source_remove(self.checker_initiator_tag)

610

429

self.checker_initiator_tag = None

611

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

612

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self.enabled = False

613

if not quiet:

614

self.send_changedstate()

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434

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

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return False

617

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def __del__(self):

438

self.disable_hook = None

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self.disable()

620

440

621

def init_checker(self):

622

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

623

# and every interval from then on.

624

if self.checker_initiator_tag is not None:

625

gobject.source_remove(self.checker_initiator_tag)

626

self.checker_initiator_tag = (gobject.timeout_add

627

(self.interval_milliseconds(),

628

self.start_checker))

629

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

630

if self.disable_initiator_tag is not None:

631

gobject.source_remove(self.disable_initiator_tag)

632

self.disable_initiator_tag = (gobject.timeout_add

633

(self.timeout_milliseconds(),

634

self.disable))

635

# Also start a new checker *right now*.

636

self.start_checker()

637

638

441

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

639

442

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

640

443

self.checker_callback_tag = None

641

444

self.checker = None

642

445

if os.WIFEXITED(condition):

643

self.last_checker_status = os.WEXITSTATUS(condition)

644

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

645

448

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

646

449

vars(self))

647

450

self.checked_ok()

649

452

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

650

453

vars(self))

651

454

else:

652

self.last_checker_status = -1

653

455

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

654

456

vars(self))

655

457

656

def checked_ok(self):

657

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

658

self.last_checked_ok = datetime.datetime.utcnow()

659

self.last_checker_status = 0

660

self.bump_timeout()

661

662

def bump_timeout(self, timeout=None):

663

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

458

def checked_ok(self, timeout=None):

459

"""Bump up the timeout for this client.

460

461

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

462

alive and well.

463

"""

664

464

if timeout is None:

665

465

timeout = self.timeout

666

if self.disable_initiator_tag is not None:

667

gobject.source_remove(self.disable_initiator_tag)

668

self.disable_initiator_tag = None

669

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

670

self.disable_initiator_tag = (gobject.timeout_add

671

(timedelta_to_milliseconds

672

(timeout), self.disable))

673

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

466

self.last_checked_ok = datetime.datetime.utcnow()

467

gobject.source_remove(self.disable_initiator_tag)

468

self.disable_initiator_tag = (gobject.timeout_add

469

(_timedelta_to_milliseconds

470

(timeout), self.disable))

471

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

674

472

675

473

def need_approval(self):

676

474

self.last_approval_request = datetime.datetime.utcnow()

681

479

If a checker already exists, leave it running and do

682

480

nothing."""

683

481

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

684

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

685

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

686

# would inevitably timeout, since no checker would get a

687

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

482

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

483

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

484

# client would inevitably timeout, since no checker would get

485

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

688

486

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

689

487

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

690

488

# should be.

692

490

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

693

491

try:

694

492

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

695

except AttributeError:

696

pass

697

except OSError as error:

698

if error.errno != errno.ECHILD:

699

raise

493

except (AttributeError, OSError) as error:

494

if (isinstance(error, OSError)

495

and error.errno != errno.ECHILD):

496

raise error

700

497

else:

701

498

if pid:

702

499

logger.warning("Checker was a zombie")

705

502

self.current_checker_command)

706

503

# Start a new checker if needed

707

504

if self.checker is None:

708

# Escape attributes for the shell

709

escaped_attrs = dict(

710

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

711

for attr in

712

self.runtime_expansions)

713

505

try:

714

command = self.checker_command % escaped_attrs

715

except TypeError as error:

716

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

717

self.checker_command, exc_info=error)

718

return True # Try again later

506

# In case checker_command has exactly one % operator

507

command = self.checker_command % self.host

508

except TypeError:

509

# Escape attributes for the shell

510

escaped_attrs = dict(

511

(attr,

512

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

513

errors=

514

'replace')))

515

for attr in

516

self.runtime_expansions)

517

518

try:

519

command = self.checker_command % escaped_attrs

520

except TypeError as error:

521

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

522

' %s', self.checker_command, error)

523

return True # Try again later

719

524

self.current_checker_command = command

720

525

try:

721

526

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

724

529

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

725

530

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

726

531

# always replaced by /dev/null.)

727

# The exception is when not debugging but nevertheless

728

# running in the foreground; use the previously

729

# created wnull.

730

popen_args = {}

731

if (not self.server_settings["debug"]

732

and self.server_settings["foreground"]):

733

popen_args.update({"stdout": wnull,

734

"stderr": wnull })

735

532

self.checker = subprocess.Popen(command,

736

533

close_fds=True,

737

shell=True, cwd="/",

738

**popen_args)

739

except OSError as error:

740

logger.error("Failed to start subprocess",

741

exc_info=error)

742

return True

743

self.checker_callback_tag = (gobject.child_watch_add

744

(self.checker.pid,

745

self.checker_callback,

746

data=command))

747

# The checker may have completed before the gobject

748

# watch was added. Check for this.

749

try:

534

shell=True, cwd="/")

535

self.checker_callback_tag = (gobject.child_watch_add

536

(self.checker.pid,

537

self.checker_callback,

538

data=command))

539

# The checker may have completed before the gobject

540

# watch was added. Check for this.

750

541

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

542

if pid:

543

gobject.source_remove(self.checker_callback_tag)

544

self.checker_callback(pid, status, command)

751

545

except OSError as error:

752

if error.errno == errno.ECHILD:

753

# This should never happen

754

logger.error("Child process vanished",

755

exc_info=error)

756

return True

757

raise

758

if pid:

759

gobject.source_remove(self.checker_callback_tag)

760

self.checker_callback(pid, status, command)

546

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

547

error)

761

548

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

762

549

return True

763

550

770

557

return

771

558

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

772

559

try:

773

self.checker.terminate()

560

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

774

561

#time.sleep(0.5)

775

562

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

776

# self.checker.kill()

563

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

777

564

except OSError as error:

778

565

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

779

566

raise

796

583

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

797

584

if byte_arrays and signature != "ay":

798

585

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

799

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

586

" signature %r" % signature)

800

587

def decorator(func):

801

588

func._dbus_is_property = True

802

589

func._dbus_interface = dbus_interface

810

597

return decorator

811

598

812

599

813

def dbus_interface_annotations(dbus_interface):

814

"""Decorator for marking functions returning interface annotations

815

816

Usage:

817

818

@dbus_interface_annotations("org.example.Interface")

819

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

820

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

821

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

822

"false"}

823

"""

824

def decorator(func):

825

func._dbus_is_interface = True

826

func._dbus_interface = dbus_interface

827

func._dbus_name = dbus_interface

828

return func

829

return decorator

830

831

832

def dbus_annotations(annotations):

833

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

834

Usage:

835

836

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

837

access="r")

838

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

839

"org.freedesktop.DBus.Property."

840

"EmitsChangedSignal": "false"})

841

def Property_dbus_property(self):

842

return dbus.Boolean(False)

843

"""

844

def decorator(func):

845

func._dbus_annotations = annotations

846

return func

847

return decorator

848

849

850

600

class DBusPropertyException(dbus.exceptions.DBusException):

851

601

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

852

602

"""

875

625

"""

876

626

877

627

@staticmethod

878

def _is_dbus_thing(thing):

879

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

880

881

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

882

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

883

"""

884

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

885

False)

628

def _is_dbus_property(obj):

629

return getattr(obj, "_dbus_is_property", False)

886

630

887

def _get_all_dbus_things(self, thing):

631

def _get_all_dbus_properties(self):

888

632

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

889

633

"""

890

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

891

name),

892

athing.__get__(self))

634

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

893

635

for cls in self.__class__.__mro__

894

for name, athing in

895

inspect.getmembers(cls,

896

self._is_dbus_thing(thing)))

636

for name, prop in

637

inspect.getmembers(cls, self._is_dbus_property))

897

638

898

639

def _get_dbus_property(self, interface_name, property_name):

899

640

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

901

642

"""

902

643

for cls in self.__class__.__mro__:

903

644

for name, value in (inspect.getmembers

904

(cls,

905

self._is_dbus_thing("property"))):

645

(cls, self._is_dbus_property)):

906

646

if (value._dbus_name == property_name

907

647

and value._dbus_interface == interface_name):

908

648

return value.__get__(self)

936

676

# The byte_arrays option is not supported yet on

937

677

# signatures other than "ay".

938

678

if prop._dbus_signature != "ay":

939

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

940

"'ay' signature {0!r}"

941

.format(prop._dbus_signature))

942

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

943

for byte in value))

679

raise ValueError

680

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

681

for byte in value))

944

682

prop(value)

945

683

946

684

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

951

689

952

690

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

953

691

"""

954

properties = {}

955

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

692

all = {}

693

for name, prop in self._get_all_dbus_properties():

956

694

if (interface_name

957

695

and interface_name != prop._dbus_interface):

958

696

# Interface non-empty but did not match

962

700

continue

963

701

value = prop()

964

702

if not hasattr(value, "variant_level"):

965

properties[name] = value

703

all[name] = value

966

704

continue

967

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

968

value.variant_level+1)

969

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

705

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

706

value.variant_level+1)

707

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

970

708

971

709

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

972

710

out_signature="s",

973

711

path_keyword='object_path',

974

712

connection_keyword='connection')

975

713

def Introspect(self, object_path, connection):

976

"""Overloading of standard D-Bus method.

977

978

Inserts property tags and interface annotation tags.

714

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

979

715

"""

980

716

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

981

717

connection)

988

724

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

989

725

return e

990

726

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

991

# Add property tags

992

727

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

993

728

for name, prop

994

in self._get_all_dbus_things("property")

729

in self._get_all_dbus_properties()

995

730

if prop._dbus_interface

996

731

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

997

732

if_tag.appendChild(tag)

998

# Add annotation tags

999

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

1000

for tag in if_tag.getElementsByTagName(typ):

1001

annots = dict()

1002

for name, prop in (self.

1003

_get_all_dbus_things(typ)):

1004

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

1005

and prop._dbus_interface

1006

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

1007

annots.update(getattr

1008

(prop,

1009

"_dbus_annotations",

1010

{}))

1011

for name, value in annots.iteritems():

1012

ann_tag = document.createElement(

1013

"annotation")

1014

ann_tag.setAttribute("name", name)

1015

ann_tag.setAttribute("value", value)

1016

tag.appendChild(ann_tag)

1017

# Add interface annotation tags

1018

for annotation, value in dict(

1019

itertools.chain.from_iterable(

1020

annotations().iteritems()

1021

for name, annotations in

1022

self._get_all_dbus_things("interface")

1023

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

1024

)).iteritems():

1025

ann_tag = document.createElement("annotation")

1026

ann_tag.setAttribute("name", annotation)

1027

ann_tag.setAttribute("value", value)

1028

if_tag.appendChild(ann_tag)

1029

733

# Add the names to the return values for the

1030

734

# "org.freedesktop.DBus.Properties" methods

1031

735

if (if_tag.getAttribute("name")

1046

750

except (AttributeError, xml.dom.DOMException,

1047

751

xml.parsers.expat.ExpatError) as error:

1048

752

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

1049

exc_info=error)

753

error)

1050

754

return xmlstring

1051

755

1052

756

1053

def datetime_to_dbus(dt, variant_level=0):

757

def datetime_to_dbus (dt, variant_level=0):

1054

758

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

1055

759

if dt is None:

1056

760

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

1057

761

return dbus.String(dt.isoformat(),

1058

762

variant_level=variant_level)

1059

763

1060

1061

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1062

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

1063

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

1064

interface names according to the "alt_interface_names" mapping.

1065

Usage:

1066

1067

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

1068

"net.example.AlternateInterface"})

1069

class SampleDBusObject(dbus.service.Object):

1070

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

1071

def SampleDBusMethod():

1072

pass

1073

1074

The above "SampleDBusMethod" on "SampleDBusObject" will be

1075

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

1076

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

1077

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

1078

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

1079

1080

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

1081

(from DBusObjectWithProperties) and interfaces (from the

1082

dbus_interface_annotations decorator).

764

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

765

.__metaclass__):

766

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

767

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

1083

768

"""

1084

def wrapper(cls):

1085

for orig_interface_name, alt_interface_name in (

1086

alt_interface_names.iteritems()):

1087

attr = {}

1088

interface_names = set()

1089

# Go though all attributes of the class

1090

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

769

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

770

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

771

# methods, signals, or properties in them

772

for base in (b for b in bases

773

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

774

# Go though all attributes of the base class

775

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

1091

776

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

1092

777

# with the wrong interface name

1093

778

if (not hasattr(attribute, "_dbus_interface")

1094

779

or not attribute._dbus_interface

1095

.startswith(orig_interface_name)):

780

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

1096

781

continue

1097

782

# Create an alternate D-Bus interface name based on

1098

783

# the current name

1099

784

alt_interface = (attribute._dbus_interface

1100

.replace(orig_interface_name,

1101

alt_interface_name))

1102

interface_names.add(alt_interface)

785

.replace("se.recompile.Mandos",

786

"se.bsnet.fukt.Mandos"))

1103

787

# Is this a D-Bus signal?

1104

788

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

1105

# Extract the original non-method undecorated

1106

# function by black magic

789

# Extract the original non-method function by

790

# black magic

1107

791

nonmethod_func = (dict(

1108

792

zip(attribute.func_code.co_freevars,

1109

793

attribute.__closure__))["func"]

1120

804

nonmethod_func.func_name,

1121

805

nonmethod_func.func_defaults,

1122

806

nonmethod_func.func_closure)))

1123

# Copy annotations, if any

1124

try:

1125

new_function._dbus_annotations = (

1126

dict(attribute._dbus_annotations))

1127

except AttributeError:

1128

pass

1129

807

# Define a creator of a function to call both the

1130

# original and alternate functions, so both the

1131

# original and alternate signals gets sent when

1132

# the function is called

808

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

809

# signals gets sent when the function is called

1133

810

def fixscope(func1, func2):

1134

811

"""This function is a scope container to pass

1135

812

func1 and func2 to the "call_both" function

1142

819

return call_both

1143

820

# Create the "call_both" function and add it to

1144

821

# the class

1145

attr[attrname] = fixscope(attribute, new_function)

822

attr[attrname] = fixscope(attribute,

823

new_function)

1146

824

# Is this a D-Bus method?

1147

825

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

1148

826

# Create a new, but exactly alike, function

1159

837

attribute.func_name,

1160

838

attribute.func_defaults,

1161

839

attribute.func_closure)))

1162

# Copy annotations, if any

1163

try:

1164

attr[attrname]._dbus_annotations = (

1165

dict(attribute._dbus_annotations))

1166

except AttributeError:

1167

pass

1168

840

# Is this a D-Bus property?

1169

841

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

1170

842

# Create a new, but exactly alike, function

1184

856

attribute.func_name,

1185

857

attribute.func_defaults,

1186

858

attribute.func_closure)))

1187

# Copy annotations, if any

1188

try:

1189

attr[attrname]._dbus_annotations = (

1190

dict(attribute._dbus_annotations))

1191

except AttributeError:

1192

pass

1193

# Is this a D-Bus interface?

1194

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

1195

# Create a new, but exactly alike, function

1196

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

1197

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

1198

# to the class.

1199

attr[attrname] = (dbus_interface_annotations

1200

(alt_interface)

1201

(types.FunctionType

1202

(attribute.func_code,

1203

attribute.func_globals,

1204

attribute.func_name,

1205

attribute.func_defaults,

1206

attribute.func_closure)))

1207

if deprecate:

1208

# Deprecate all alternate interfaces

1209

iname="_AlternateDBusNames_interface_annotation{0}"

1210

for interface_name in interface_names:

1211

@dbus_interface_annotations(interface_name)

1212

def func(self):

1213

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

1214

"true" }

1215

# Find an unused name

1216

for aname in (iname.format(i)

1217

for i in itertools.count()):

1218

if aname not in attr:

1219

attr[aname] = func

1220

break

1221

if interface_names:

1222

# Replace the class with a new subclass of it with

1223

# methods, signals, etc. as created above.

1224

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

1225

(cls,), attr)

1226

return cls

1227

return wrapper

1228

1229

1230

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

1231

"se.bsnet.fukt.Mandos"})

859

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

860

1232

861

class ClientDBus(Client, DBusObjectWithProperties):

1233

862

"""A Client class using D-Bus

1234

863

1243

872

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

1244

873

1245

874

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

875

self._approvals_pending = 0

1246

876

self.bus = bus

1247

877

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

1248

878

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

1254

884

("/clients/" + client_object_name))

1255

885

DBusObjectWithProperties.__init__(self, self.bus,

1256

886

self.dbus_object_path)

1257

887

1258

888

def notifychangeproperty(transform_func,

1259

889

dbus_name, type_func=lambda x: x,

1260

890

variant_level=1):

1261

891

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

1262

892

its changes to DBus.

1263

1264

transform_fun: Function that takes a value and a variant_level

1265

and transforms it to a D-Bus type.

893

894

transform_fun: Function that takes a value and transforms it

895

to a D-Bus type.

1266

896

dbus_name: D-Bus name of the variable

1267

897

type_func: Function that transform the value before sending it

1268

898

to the D-Bus. Default: no transform

1275

905

type_func(getattr(self, attrname, None))

1276

906

!= type_func(value)):

1277

907

dbus_value = transform_func(type_func(value),

1278

variant_level

1279

=variant_level)

908

variant_level)

1280

909

self.PropertyChanged(dbus.String(dbus_name),

1281

910

dbus_value)

1282

911

setattr(self, attrname, value)

1283

912

1284

913

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

1285

914

915

1286

916

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1287

917

approvals_pending = notifychangeproperty(dbus.Boolean,

1288

918

"ApprovalPending",

1295

925

checker is not None)

1296

926

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1297

927

"LastCheckedOK")

1298

last_checker_status = notifychangeproperty(dbus.Int16,

1299

"LastCheckerStatus")

1300

928

last_approval_request = notifychangeproperty(

1301

929

datetime_to_dbus, "LastApprovalRequest")

1302

930

approved_by_default = notifychangeproperty(dbus.Boolean,

1303

931

"ApprovedByDefault")

1304

approval_delay = notifychangeproperty(dbus.UInt64,

932

approval_delay = notifychangeproperty(dbus.UInt16,

1305

933

"ApprovalDelay",

1306

934

type_func =

1307

timedelta_to_milliseconds)

935

_timedelta_to_milliseconds)

1308

936

approval_duration = notifychangeproperty(

1309

dbus.UInt64, "ApprovalDuration",

1310

type_func = timedelta_to_milliseconds)

937

dbus.UInt16, "ApprovalDuration",

938

type_func = _timedelta_to_milliseconds)

1311

939

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

1312

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

940

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

1313

941

type_func =

1314

timedelta_to_milliseconds)

942

_timedelta_to_milliseconds)

1315

943

extended_timeout = notifychangeproperty(

1316

dbus.UInt64, "ExtendedTimeout",

1317

type_func = timedelta_to_milliseconds)

1318

interval = notifychangeproperty(dbus.UInt64,

944

dbus.UInt16, "ExtendedTimeout",

945

type_func = _timedelta_to_milliseconds)

946

interval = notifychangeproperty(dbus.UInt16,

1319

947

"Interval",

1320

948

type_func =

1321

timedelta_to_milliseconds)

949

_timedelta_to_milliseconds)

1322

950

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

1323

951

1324

952

del notifychangeproperty

1352

980

*args, **kwargs)

1353

981

1354

982

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

1355

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

983

old_checker = self.checker

984

if self.checker is not None:

985

old_checker_pid = self.checker.pid

986

else:

987

old_checker_pid = None

1356

988

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

1357

989

# Only if new checker process was started

1358

990

if (self.checker is not None

1362

994

return r

1363

995

1364

996

def _reset_approved(self):

1365

self.approved = None

997

self._approved = None

1366

998

return False

1367

999

1368

1000

def approve(self, value=True):

1369

self.approved = value

1370

gobject.timeout_add(timedelta_to_milliseconds

1001

self.send_changedstate()

1002

self._approved = value

1003

gobject.timeout_add(_timedelta_to_milliseconds

1371

1004

(self.approval_duration),

1372

1005

self._reset_approved)

1373

self.send_changedstate()

1006

1374

1007

1375

1008

## D-Bus methods, signals & properties

1376

1009

_interface = "se.recompile.Mandos.Client"

1377

1010

1378

## Interfaces

1379

1380

@dbus_interface_annotations(_interface)

1381

def _foo(self):

1382

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

1383

"false"}

1384

1385

1011

## Signals

1386

1012

1387

1013

# CheckerCompleted - signal

1486

1112

access="readwrite")

1487

1113

def ApprovalDuration_dbus_property(self, value=None):

1488

1114

if value is None: # get

1489

return dbus.UInt64(timedelta_to_milliseconds(

1115

return dbus.UInt64(_timedelta_to_milliseconds(

1490

1116

self.approval_duration))

1491

1117

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

1492

1118

1506

1132

def Host_dbus_property(self, value=None):

1507

1133

if value is None: # get

1508

1134

return dbus.String(self.host)

1509

self.host = unicode(value)

1135

self.host = value

1510

1136

1511

1137

# Created - property

1512

1138

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

1513

1139

def Created_dbus_property(self):

1514

return datetime_to_dbus(self.created)

1140

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

1515

1141

1516

1142

# LastEnabled - property

1517

1143

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

1538

1164

return

1539

1165

return datetime_to_dbus(self.last_checked_ok)

1540

1166

1541

# LastCheckerStatus - property

1542

@dbus_service_property(_interface, signature="n",

1543

access="read")

1544

def LastCheckerStatus_dbus_property(self):

1545

return dbus.Int16(self.last_checker_status)

1546

1547

1167

# Expires - property

1548

1168

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

1549

1169

def Expires_dbus_property(self):

1560

1180

def Timeout_dbus_property(self, value=None):

1561

1181

if value is None: # get

1562

1182

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1564

1183

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

1565

# Reschedule disabling

1566

if self.enabled:

1567

now = datetime.datetime.utcnow()

1568

self.expires += self.timeout - old_timeout

1569

if self.expires <= now:

1570

# The timeout has passed

1571

self.disable()

1572

else:

1573

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

1574

is None):

1575

return

1576

gobject.source_remove(self.disable_initiator_tag)

1577

self.disable_initiator_tag = (

1578

gobject.timeout_add(

1579

timedelta_to_milliseconds(self.expires - now),

1580

self.disable))

1184

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

1185

return

1186

# Reschedule timeout

1187

gobject.source_remove(self.disable_initiator_tag)

1188

self.disable_initiator_tag = None

1189

self.expires = None

1190

time_to_die = (self.

1191

_timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow()))

1196

if time_to_die <= 0:

1197

# The timeout has passed

1198

self.disable()

1199

else:

1200

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

1201

+ datetime.timedelta(milliseconds =

1202

time_to_die))

1203

self.disable_initiator_tag = (gobject.timeout_add

1204

(time_to_die, self.disable))

1581

1205

1582

1206

# ExtendedTimeout - property

1583

1207

@dbus_service_property(_interface, signature="t",

1596

1220

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

1597

1221

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

1598

1222

return

1599

if self.enabled:

1600

# Reschedule checker run

1601

gobject.source_remove(self.checker_initiator_tag)

1602

self.checker_initiator_tag = (gobject.timeout_add

1603

(value, self.start_checker))

1604

self.start_checker() # Start one now, too

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

1605

1228

1606

1229

# Checker - property

1607

1230

@dbus_service_property(_interface, signature="s",

1609

1232

def Checker_dbus_property(self, value=None):

1610

1233

if value is None: # get

1611

1234

return dbus.String(self.checker_command)

1612

self.checker_command = unicode(value)

1235

self.checker_command = value

1613

1236

1614

1237

# CheckerRunning - property

1615

1238

@dbus_service_property(_interface, signature="b",

1644

1267

raise KeyError()

1645

1268

1646

1269

def __getattribute__(self, name):

1647

if name == '_pipe':

1270

if(name == '_pipe'):

1648

1271

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

1649

1272

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

1650

1273

data = self._pipe.recv()

1657

1280

return func

1658

1281

1659

1282

def __setattr__(self, name, value):

1660

if name == '_pipe':

1283

if(name == '_pipe'):

1661

1284

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

1662

1285

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

1663

1286

1287

class ClientDBusTransitional(ClientDBus):

1288

__metaclass__ = AlternateDBusNamesMetaclass

1664

1289

1665

1290

class ClientHandler(socketserver.BaseRequestHandler, object):

1666

1291

"""A class to handle client connections.

1703

1328

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

1704

1329

try:

1705

1330

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

1706

raise RuntimeError(line)

1331

raise RuntimeError

1707

1332

except (ValueError, IndexError, RuntimeError) as error:

1708

1333

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

1709

1334

return

1749

1374

client.Rejected("Disabled")

1750

1375

return

1751

1376

1752

if client.approved or not client.approval_delay:

1377

if client._approved or not client.approval_delay:

1753

1378

#We are approved or approval is disabled

1754

1379

break

1755

elif client.approved is None:

1380

elif client._approved is None:

1756

1381

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

1757

1382

client.name)

1758

1383

if self.server.use_dbus:

1771

1396

#wait until timeout or approved

1772

1397

time = datetime.datetime.now()

1773

1398

client.changedstate.acquire()

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1399

(client.changedstate.wait

1400

(float(client._timedelta_to_milliseconds(delay)

1401

/ 1000)))

1777

1402

client.changedstate.release()

1778

1403

time2 = datetime.datetime.now()

1779

1404

if (time2 - time) >= delay:

1795

1420

try:

1796

1421

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

1797

1422

except gnutls.errors.GNUTLSError as error:

1798

logger.warning("gnutls send failed",

1799

exc_info=error)

1423

logger.warning("gnutls send failed")

1800

1424

return

1801

1425

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

1802

1426

sent, len(client.secret)

1805

1429

1806

1430

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

1807

1431

# bump the timeout using extended_timeout

1808

client.bump_timeout(client.extended_timeout)

1432

client.checked_ok(client.extended_timeout)

1809

1433

if self.server.use_dbus:

1810

1434

# Emit D-Bus signal

1811

1435

client.GotSecret()

1816

1440

try:

1817

1441

session.bye()

1818

1442

except gnutls.errors.GNUTLSError as error:

1819

logger.warning("GnuTLS bye failed",

1820

exc_info=error)

1443

logger.warning("GnuTLS bye failed")

1821

1444

1822

1445

@staticmethod

1823

1446

def peer_certificate(session):

1879

1502

# Convert the buffer to a Python bytestring

1880

1503

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

1881

1504

# Convert the bytestring to hexadecimal notation

1882

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

1505

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

1883

1506

return hex_fpr

1884

1507

1885

1508

1888

1511

def sub_process_main(self, request, address):

1889

1512

try:

1890

1513

self.finish_request(request, address)

1891

except Exception:

1514

except:

1892

1515

self.handle_error(request, address)

1893

1516

self.close_request(request)

1894

1517

1895

1518

def process_request(self, request, address):

1896

1519

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

1897

1520

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

1898

args = (request, address))

1521

args = (request,

1522

address))

1899

1523

proc.start()

1900

1524

return proc

1901

1525

1916

1540

1917

1541

def add_pipe(self, parent_pipe, proc):

1918

1542

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

1919

raise NotImplementedError()

1543

raise NotImplementedError

1920

1544

1921

1545

1922

1546

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1929

1553

use_ipv6: Boolean; to use IPv6 or not

1930

1554

"""

1931

1555

def __init__(self, server_address, RequestHandlerClass,

1932

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

1933

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

1934

creating a new one with socket.socket().

1935

"""

1556

interface=None, use_ipv6=True):

1936

1557

self.interface = interface

1937

1558

if use_ipv6:

1938

1559

self.address_family = socket.AF_INET6

1939

if socketfd is not None:

1940

# Save the file descriptor

1941

self.socketfd = socketfd

1942

# Save the original socket.socket() function

1943

self.socket_socket = socket.socket

1944

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

1945

#

1946

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

1947

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

1948

# patching socket.socket.)

1949

#

1950

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

1951

@functools.wraps(socket.socket)

1952

def socket_wrapper(*args, **kwargs):

1953

# Restore original function so subsequent calls are

1954

# not affected.

1955

socket.socket = self.socket_socket

1956

del self.socket_socket

1957

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

1958

# saved file descriptor.

1959

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

1960

# Replace socket.socket() function with wrapper

1961

socket.socket = socket_wrapper

1962

# The socketserver.TCPServer.__init__ will call

1963

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

1964

# socket_wrapper(), if socketfd was set.

1965

1560

socketserver.TCPServer.__init__(self, server_address,

1966

1561

RequestHandlerClass)

1967

1968

1562

def server_bind(self):

1969

1563

"""This overrides the normal server_bind() function

1970

1564

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

1978

1572

try:

1979

1573

self.socket.setsockopt(socket.SOL_SOCKET,

1980

1574

SO_BINDTODEVICE,

1981

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

1575

str(self.interface

1576

+ '\0'))

1982

1577

except socket.error as error:

1983

if error.errno == errno.EPERM:

1984

logger.error("No permission to bind to"

1985

" interface %s", self.interface)

1986

elif error.errno == errno.ENOPROTOOPT:

1578

if error[0] == errno.EPERM:

1579

logger.error("No permission to"

1580

" bind to interface %s",

1581

self.interface)

1582

elif error[0] == errno.ENOPROTOOPT:

1987

1583

logger.error("SO_BINDTODEVICE not available;"

1988

1584

" cannot bind to interface %s",

1989

1585

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

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

1992

" cannot bind", self.interface)

1993

1586

else:

1994

1587

raise

1995

1588

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

1998

1591

if self.address_family == socket.AF_INET6:

1999

1592

any_address = "::" # in6addr_any

2000

1593

else:

2001

any_address = "0.0.0.0" # INADDR_ANY

1594

any_address = socket.INADDR_ANY

2002

1595

self.server_address = (any_address,

2003

1596

self.server_address[1])

2004

1597

elif not self.server_address[1]:

2025

1618

"""

2026

1619

def __init__(self, server_address, RequestHandlerClass,

2027

1620

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

2028

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

1621

gnutls_priority=None, use_dbus=True):

2029

1622

self.enabled = False

2030

1623

self.clients = clients

2031

1624

if self.clients is None:

2032

self.clients = {}

1625

self.clients = set()

2033

1626

self.use_dbus = use_dbus

2034

1627

self.gnutls_priority = gnutls_priority

2035

1628

IPv6_TCPServer.__init__(self, server_address,

2036

1629

RequestHandlerClass,

2037

1630

interface = interface,

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1631

use_ipv6 = use_ipv6)

2040

1632

def server_activate(self):

2041

1633

if self.enabled:

2042

1634

return socketserver.TCPServer.server_activate(self)

2055

1647

2056

1648

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

2057

1649

proc = None, client_object=None):

1650

condition_names = {

1651

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

1652

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

1653

# blocking).

1654

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

1655

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

1656

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

1657

# broken, usually for pipes and

1658

# sockets).

1659

}

1660

conditions_string = ' | '.join(name

1661

for cond, name in

1662

condition_names.iteritems()

1663

if cond & condition)

2058

1664

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

2059

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

1665

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

2060

1666

# Wait for other process to exit

2061

1667

proc.join()

2062

1668

return False

2069

1675

fpr = request[1]

2070

1676

address = request[2]

2071

1677

2072

for c in self.clients.itervalues():

1678

for c in self.clients:

2073

1679

if c.fingerprint == fpr:

2074

1680

client = c

2075

1681

break

2120

1726

return True

2121

1727

2122

1728

2123

def rfc3339_duration_to_delta(duration):

2124

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

2125

2126

>>> rfc3339_duration_to_delta("P7D")

2127

datetime.timedelta(7)

2128

>>> rfc3339_duration_to_delta("PT60S")

2129

datetime.timedelta(0, 60)

2130

>>> rfc3339_duration_to_delta("PT60M")

2131

datetime.timedelta(0, 3600)

2132

>>> rfc3339_duration_to_delta("PT24H")

2133

datetime.timedelta(1)

2134

>>> rfc3339_duration_to_delta("P1W")

2135

datetime.timedelta(7)

2136

>>> rfc3339_duration_to_delta("PT5M30S")

2137

datetime.timedelta(0, 330)

2138

>>> rfc3339_duration_to_delta("P1DT3M20S")

2139

datetime.timedelta(1, 200)

2140

"""

2141

2142

# Parsing an RFC 3339 duration with regular expressions is not

2143

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

2144

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

2145

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

2146

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

2147

# avoid excessive use of external libraries.

2148

2149

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

2150

Token = collections.namedtuple("Token",

2151

("regexp", # To match token; if

2152

# "value" is not None,

2153

# must have a "group"

2154

# containing digits

2155

"value", # datetime.timedelta or

2156

# None

2157

"followers")) # Tokens valid after

2158

# this token

2159

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

2160

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

2161

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

2162

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

2163

datetime.timedelta(seconds=1),

2164

frozenset((token_end,)))

2165

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

2166

datetime.timedelta(minutes=1),

2167

frozenset((token_second, token_end)))

2168

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

2169

datetime.timedelta(hours=1),

2170

frozenset((token_minute, token_end)))

2171

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

2172

None,

2173

frozenset((token_hour, token_minute,

2174

token_second)))

2175

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

2176

datetime.timedelta(days=1),

2177

frozenset((token_time, token_end)))

2178

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

2179

datetime.timedelta(weeks=4),

2180

frozenset((token_day, token_end)))

2181

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

2182

datetime.timedelta(weeks=52),

2183

frozenset((token_month, token_end)))

2184

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

2185

datetime.timedelta(weeks=1),

2186

frozenset((token_end,)))

2187

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

2188

frozenset((token_year, token_month,

2189

token_day, token_time,

2190

token_week))),

2191

# Define starting values

2192

value = datetime.timedelta() # Value so far

2193

found_token = None

2194

followers = frozenset(token_duration,) # Following valid tokens

2195

s = duration # String left to parse

2196

# Loop until end token is found

2197

while found_token is not token_end:

2198

# Search for any currently valid tokens

2199

for token in followers:

2200

match = token.regexp.match(s)

2201

if match is not None:

2202

# Token found

2203

if token.value is not None:

2204

# Value found, parse digits

2205

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

2206

# Add to value so far

2207

value += factor * token.value

2208

# Strip token from string

2209

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

2210

# Go to found token

2211

found_token = token

2212

# Set valid next tokens

2213

followers = found_token.followers

2214

break

2215

else:

2216

# No currently valid tokens were found

2217

raise ValueError("Invalid RFC 3339 duration")

2218

# End token found

2219

return value

2220

2221

2222

1729

def string_to_delta(interval):

2223

1730

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

2224

1731

2235

1742

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

2236

1743

datetime.timedelta(0, 330)

2237

1744

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

2244

1745

timevalue = datetime.timedelta(0)

2245

1746

for s in interval.split():

2246

1747

try:

2257

1758

elif suffix == "w":

2258

1759

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

2259

1760

else:

2260

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

2261

.format(suffix))

2262

except IndexError as e:

1761

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

1762

except (ValueError, IndexError) as e:

2263

1763

raise ValueError(*(e.args))

2264

1764

timevalue += delta

2265

1765

return timevalue

2266

1766

2267

1767

1768

def if_nametoindex(interface):

1769

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

1770

1771

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

1772

global if_nametoindex

1773

try:

1774

if_nametoindex = (ctypes.cdll.LoadLibrary

1775

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

1776

.if_nametoindex)

1777

except (OSError, AttributeError):

1778

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

1779

def if_nametoindex(interface):

1780

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

1781

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

1782

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

1783

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1784

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

1785

interface))

1786

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

1787

ifreq[16:20])[0]

1788

return interface_index

1789

return if_nametoindex(interface)

1790

1791

2268

1792

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

2269

1793

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

2270

1794

2278

1802

sys.exit()

2279

1803

if not noclose:

2280

1804

# Close all standard open file descriptors

2281

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

1805

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

2282

1806

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

2283

1807

raise OSError(errno.ENODEV,

2284

"{0} not a character device"

2285

.format(os.devnull))

1808

"%s not a character device"

1809

% os.path.devnull)

2286

1810

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

2287

1811

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

2288

1812

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

2297

1821

2298

1822

parser = argparse.ArgumentParser()

2299

1823

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

2300

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

1824

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

2301

1825

help="show version number and exit")

2302

1826

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

2303

1827

help="Bind to interface IF")

2309

1833

help="Run self-test")

2310

1834

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

2311

1835

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

2312

" to terminal", default=None)

1836

" to terminal")

2313

1837

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

2314

1838

help="Debug level for stdout output")

2315

1839

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

2322

1846

" files")

2323

1847

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

2324

1848

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

2325

" system bus interface", default=None)

1849

" system bus interface")

2326

1850

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

2327

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

2328

default=None)

2329

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

2330

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

2331

" state", default=None)

2332

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

2333

help="Specify a file descriptor to a network"

2334

" socket to use instead of creating one")

2335

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

2336

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

2337

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

2338

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

2339

1851

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

2340

1852

options = parser.parse_args()

2341

1853

2342

1854

if options.check:

2343

1855

import doctest

2344

fail_count, test_count = doctest.testmod()

2345

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

1856

doctest.testmod()

1857

sys.exit()

2346

1858

2347

1859

# Default values for config file for server-global settings

2348

1860

server_defaults = { "interface": "",

2350

1862

"port": "",

2351

1863

"debug": "False",

2352

1864

"priority":

2353

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

1865

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

2354

1866

"servicename": "Mandos",

2355

1867

"use_dbus": "True",

2356

1868

"use_ipv6": "True",

2357

1869

"debuglevel": "",

2358

"restore": "True",

2359

"socket": "",

2360

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

2361

"foreground": "False",

2362

1870

}

2363

1871

2364

1872

# Parse config file for server-global settings

2369

1877

# Convert the SafeConfigParser object to a dict

2370

1878

server_settings = server_config.defaults()

2371

1879

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

2372

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

1880

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

2373

1881

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

2374

1882

option)

2375

1883

if server_settings["port"]:

2376

1884

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

2377

1885

"port")

2378

if server_settings["socket"]:

2379

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

2380

"socket")

2381

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

2382

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

2383

# happen with a supplied network socket.

2384

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

2385

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

2386

["socket"])

2387

1886

del server_config

2388

1887

2389

1888

# Override the settings from the config file with command line

2390

1889

# options, if set.

2391

1890

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

2392

1891

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

2393

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

2394

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

1892

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

2395

1893

value = getattr(options, option)

2396

1894

if value is not None:

2397

1895

server_settings[option] = value

2400

1898

for option in server_settings.keys():

2401

1899

if type(server_settings[option]) is str:

2402

1900

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

2403

# Force all boolean options to be boolean

2404

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

2405

"foreground"):

2406

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

2407

# Debug implies foreground

2408

if server_settings["debug"]:

2409

server_settings["foreground"] = True

2410

1901

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

2411

1902

2412

1903

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

2416

1907

debuglevel = server_settings["debuglevel"]

2417

1908

use_dbus = server_settings["use_dbus"]

2418

1909

use_ipv6 = server_settings["use_ipv6"]

2419

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

2420

stored_state_file)

2421

foreground = server_settings["foreground"]

2422

2423

if debug:

2424

initlogger(debug, logging.DEBUG)

2425

else:

2426

if not debuglevel:

2427

initlogger(debug)

2428

else:

2429

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

2430

initlogger(debug, level)

2431

1910

2432

1911

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

2433

1912

syslogger.setFormatter(logging.Formatter

2434

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

2435

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

2436

.format(server_settings

2437

["servicename"])))

1913

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

1914

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

1915

% server_settings["servicename"]))

2438

1916

2439

1917

# Parse config file with clients

2440

client_config = configparser.SafeConfigParser(Client

2441

.client_defaults)

1918

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

1919

"extended_timeout": "15m",

1920

"interval": "2m",

1921

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

1922

"host": "",

1923

"approval_delay": "0s",

1924

"approval_duration": "1s",

1925

}

1926

client_config = configparser.SafeConfigParser(client_defaults)

2442

1927

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

2443

1928

"clients.conf"))

2444

1929

2453

1938

use_ipv6=use_ipv6,

2454

1939

gnutls_priority=

2455

1940

server_settings["priority"],

2456

use_dbus=use_dbus,

2457

socketfd=(server_settings["socket"]

2458

or None))

2459

if not foreground:

2460

pidfilename = "/run/mandos.pid"

2461

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

2462

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

2463

pidfile = None

1941

use_dbus=use_dbus)

1942

if not debug:

1943

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

2464

1944

try:

2465

1945

pidfile = open(pidfilename, "w")

2466

except IOError as e:

2467

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

2468

exc_info=e)

1946

except IOError:

1947

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

2469

1948

2470

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

1949

try:

1950

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

1951

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

1952

except KeyError:

2471

1953

try:

2472

uid = pwd.getpwnam(name).pw_uid

2473

gid = pwd.getpwnam(name).pw_gid

2474

break

1954

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

1955

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

2475

1956

except KeyError:

2476

continue

2477

else:

2478

uid = 65534

2479

gid = 65534

1957

try:

1958

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

1959

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

1960

except KeyError:

1961

uid = 65534

1962

gid = 65534

2480

1963

try:

2481

1964

os.setgid(gid)

2482

1965

os.setuid(uid)

2483

1966

except OSError as error:

2484

if error.errno != errno.EPERM:

2485

raise

1967

if error[0] != errno.EPERM:

1968

raise error

1969

1970

if not debug and not debuglevel:

1971

syslogger.setLevel(logging.WARNING)

1972

console.setLevel(logging.WARNING)

1973

if debuglevel:

1974

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

1975

syslogger.setLevel(level)

1976

console.setLevel(level)

2486

1977

2487

1978

if debug:

2488

1979

# Enable all possible GnuTLS debugging

2499

1990

.gnutls_global_set_log_function(debug_gnutls))

2500

1991

2501

1992

# Redirect stdin so all checkers get /dev/null

2502

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

1993

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

2503

1994

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

2504

1995

if null > 2:

2505

1996

os.close(null)

1997

else:

1998

# No console logging

1999

logger.removeHandler(console)

2506

2000

2507

2001

# Need to fork before connecting to D-Bus

2508

if not foreground:

2002

if not debug:

2509

2003

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

2510

2004

daemon()

2511

2005

2512

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

2513

# need to inform gobject that threads will be used.

2514

gobject.threads_init()

2515

2516

2006

global main_loop

2517

2007

# From the Avahi example code

2518

DBusGMainLoop(set_as_default=True)

2008

DBusGMainLoop(set_as_default=True )

2519

2009

main_loop = gobject.MainLoop()

2520

2010

bus = dbus.SystemBus()

2521

2011

# End of Avahi example code

2527

2017

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

2528

2018

do_not_queue=True))

2529

2019

except dbus.exceptions.NameExistsException as e:

2530

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

2020

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

2531

2021

use_dbus = False

2532

2022

server_settings["use_dbus"] = False

2533

2023

tcp_server.use_dbus = False

2534

2024

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2535

service = AvahiServiceToSyslog(name =

2536

server_settings["servicename"],

2537

servicetype = "_mandos._tcp",

2538

protocol = protocol, bus = bus)

2025

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

2026

servicetype = "_mandos._tcp",

2027

protocol = protocol, bus = bus)

2539

2028

if server_settings["interface"]:

2540

2029

service.interface = (if_nametoindex

2541

2030

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

2545

2034

2546

2035

client_class = Client

2547

2036

if use_dbus:

2548

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

2549

2550

client_settings = Client.config_parser(client_config)

2551

old_client_settings = {}

2552

clients_data = {}

2553

2554

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

2555

global wnull

2556

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

2557

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

2558

# mode

2559

if debug or not foreground:

2560

wnull.close()

2561

2562

# Get client data and settings from last running state.

2563

if server_settings["restore"]:

2564

try:

2565

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

2566

clients_data, old_client_settings = (pickle.load

2567

(stored_state))

2568

os.remove(stored_state_path)

2569

except IOError as e:

2570

if e.errno == errno.ENOENT:

2571

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

2572

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

2573

else:

2574

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

2575

exc_info=e)

2576

raise

2577

except EOFError as e:

2578

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

2579

"EOFError:", exc_info=e)

2580

2581

with PGPEngine() as pgp:

2582

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2587

# Decide which value to use after restoring saved state.

2588

# We have three different values: Old config file,

2589

# new config file, and saved state.

2590

# New config value takes precedence if it differs from old

2591

# config value, otherwise use saved state.

2592

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

2593

try:

2594

# For each value in new config, check if it

2595

# differs from the old config value (Except for

2596

# the "secret" attribute)

2597

if (name != "secret" and

2598

value != old_client_settings[client_name]

2599

[name]):

2600

client[name] = value

2601

except KeyError:

2602

pass

2603

2604

# Clients who has passed its expire date can still be

2605

# enabled if its last checker was successful. Clients

2606

# whose checker succeeded before we stored its state is

2607

# assumed to have successfully run all checkers during

2608

# downtime.

2609

if client["enabled"]:

2610

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

2611

if not client["last_checked_ok"]:

2612

logger.warning(

2613

"disabling client {0} - Client never "

2614

"performed a successful checker"

2615

.format(client_name))

2616

client["enabled"] = False

2617

elif client["last_checker_status"] != 0:

2618

logger.warning(

2619

"disabling client {0} - Client "

2620

"last checker failed with error code {1}"

2621

.format(client_name,

2622

client["last_checker_status"]))

2623

client["enabled"] = False

2624

else:

2625

client["expires"] = (datetime.datetime

2626

.utcnow()

2627

+ client["timeout"])

2628

logger.debug("Last checker succeeded,"

2629

" keeping {0} enabled"

2630

.format(client_name))

2037

client_class = functools.partial(ClientDBusTransitional,

2038

bus = bus)

2039

def client_config_items(config, section):

2040

special_settings = {

2041

"approved_by_default":

2042

lambda: config.getboolean(section,

2043

"approved_by_default"),

2044

}

2045

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

2631

2046

try:

2632

client["secret"] = (

2633

pgp.decrypt(client["encrypted_secret"],

2634

client_settings[client_name]

2635

["secret"]))

2636

except PGPError:

2637

# If decryption fails, we use secret from new settings

2638

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

2639

.format(client_name))

2640

client["secret"] = (

2641

client_settings[client_name]["secret"])

2642

2643

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

2644

for client_name in (set(old_client_settings)

2645

- set(client_settings)):

2646

del clients_data[client_name]

2647

for client_name in (set(client_settings)

2648

- set(old_client_settings)):

2649

clients_data[client_name] = client_settings[client_name]

2650

2651

# Create all client objects

2652

for client_name, client in clients_data.iteritems():

2653

tcp_server.clients[client_name] = client_class(

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2656

2047

yield (name, special_settings[name]())

2048

except KeyError:

2049

yield (name, value)

2050

2051

tcp_server.clients.update(set(

2052

client_class(name = section,

2053

config= dict(client_config_items(

2054

client_config, section)))

2055

for section in client_config.sections()))

2657

2056

if not tcp_server.clients:

2658

2057

logger.warning("No clients defined")

2659

2660

if not foreground:

2661

if pidfile is not None:

2662

try:

2663

with pidfile:

2664

pid = os.getpid()

2665

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

2666

except IOError:

2667

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

2668

pidfilename, pid)

2669

del pidfile

2058

2059

if not debug:

2060

try:

2061

with pidfile:

2062

pid = os.getpid()

2063

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

2064

del pidfile

2065

except IOError:

2066

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

2067

pidfilename, pid)

2068

except NameError:

2069

# "pidfile" was never created

2070

pass

2670

2071

del pidfilename

2072

2073

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

2671

2074

2672

2075

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

2673

2076

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

2674

2077

2675

2078

if use_dbus:

2676

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

2677

"se.bsnet.fukt.Mandos"})

2678

class MandosDBusService(DBusObjectWithProperties):

2079

class MandosDBusService(dbus.service.Object):

2679

2080

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

2680

2081

def __init__(self):

2681

2082

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

2682

2083

_interface = "se.recompile.Mandos"

2683

2084

2684

@dbus_interface_annotations(_interface)

2685

def _foo(self):

2686

return { "org.freedesktop.DBus.Property"

2687

".EmitsChangedSignal":

2688

"false"}

2689

2690

2085

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

2691

2086

def ClientAdded(self, objpath):

2692

2087

"D-Bus signal"

2706

2101

def GetAllClients(self):

2707

2102

"D-Bus method"

2708

2103

return dbus.Array(c.dbus_object_path

2709

for c in

2710

tcp_server.clients.itervalues())

2104

for c in tcp_server.clients)

2711

2105

2712

2106

@dbus.service.method(_interface,

2713

2107

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

2715

2109

"D-Bus method"

2716

2110

return dbus.Dictionary(

2717

2111

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

2718

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

2112

for c in tcp_server.clients),

2719

2113

signature="oa{sv}")

2720

2114

2721

2115

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

2722

2116

def RemoveClient(self, object_path):

2723

2117

"D-Bus method"

2724

for c in tcp_server.clients.itervalues():

2118

for c in tcp_server.clients:

2725

2119

if c.dbus_object_path == object_path:

2726

del tcp_server.clients[c.name]

2120

tcp_server.clients.remove(c)

2727

2121

c.remove_from_connection()

2728

2122

# Don't signal anything except ClientRemoved

2729

2123

c.disable(quiet=True)

2734

2128

2735

2129

del _interface

2736

2130

2737

mandos_dbus_service = MandosDBusService()

2131

class MandosDBusServiceTransitional(MandosDBusService):

2132

__metaclass__ = AlternateDBusNamesMetaclass

2133

mandos_dbus_service = MandosDBusServiceTransitional()

2738

2134

2739

2135

def cleanup():

2740

2136

"Cleanup function; run on exit"

2741

2137

service.cleanup()

2742

2138

2743

2139

multiprocessing.active_children()

2744

wnull.close()

2745

if not (tcp_server.clients or client_settings):

2746

return

2747

2748

# Store client before exiting. Secrets are encrypted with key

2749

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

2750

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

2751

clients = {}

2752

with PGPEngine() as pgp:

2753

for client in tcp_server.clients.itervalues():

2754

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

2755

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

2756

key)

2757

client_dict = {}

2758

2759

# A list of attributes that can not be pickled

2760

# + secret.

2761

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

2762

"checker", "server_settings"))

2763

for name, typ in (inspect.getmembers

2764

(dbus.service.Object)):

2765

exclude.add(name)

2766

2767

client_dict["encrypted_secret"] = (client

2768

.encrypted_secret)

2769

for attr in client.client_structure:

2770

if attr not in exclude:

2771

client_dict[attr] = getattr(client, attr)

2772

2773

clients[client.name] = client_dict

2774

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

2775

2776

try:

2777

with (tempfile.NamedTemporaryFile

2778

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

2779

dir=os.path.dirname(stored_state_path),

2780

delete=False)) as stored_state:

2781

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

2782

tempname=stored_state.name

2783

os.rename(tempname, stored_state_path)

2784

except (IOError, OSError) as e:

2785

if not debug:

2786

try:

2787

os.remove(tempname)

2788

except NameError:

2789

pass

2790

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

2791

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

2792

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

2793

else:

2794

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

2795

exc_info=e)

2796

raise

2797

2798

# Delete all clients, and settings from config

2799

2140

while tcp_server.clients:

2800

name, client = tcp_server.clients.popitem()

2141

client = tcp_server.clients.pop()

2801

2142

if use_dbus:

2802

2143

client.remove_from_connection()

2144

client.disable_hook = None

2803

2145

# Don't signal anything except ClientRemoved

2804

2146

client.disable(quiet=True)

2805

2147

if use_dbus:

2807

2149

mandos_dbus_service.ClientRemoved(client

2808

2150

.dbus_object_path,

2809

2151

client.name)

2810

client_settings.clear()

2811

2152

2812

2153

atexit.register(cleanup)

2813

2154

2814

for client in tcp_server.clients.itervalues():

2155

for client in tcp_server.clients:

2815

2156

if use_dbus:

2816

2157

# Emit D-Bus signal

2817

2158

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2818

# Need to initiate checking of clients

2819

if client.enabled:

2820

client.init_checker()

2159

client.enable()

2821

2160

2822

2161

tcp_server.enable()

2823

2162

tcp_server.server_activate()

2826

2165

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

2827

2166

if use_ipv6:

2828

2167

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

2829

" flowinfo %d, scope_id %d",

2830

*tcp_server.socket.getsockname())

2168

" flowinfo %d, scope_id %d"

2169

% tcp_server.socket.getsockname())

2831

2170

else: # IPv4

2832

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

2833

*tcp_server.socket.getsockname())

2171

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

2172

% tcp_server.socket.getsockname())

2834

2173

2835

2174

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

2836

2175

2839

2178

try:

2840

2179

service.activate()

2841

2180

except dbus.exceptions.DBusException as error:

2842

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

2181

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

2843

2182

cleanup()

2844

2183

sys.exit(1)

2845

2184

# End of Avahi example code

2852

2191

logger.debug("Starting main loop")

2853

2192

main_loop.run()

2854

2193

except AvahiError as error:

2855

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

2194

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

2856

2195

cleanup()

2857

2196

sys.exit(1)

2858

2197

except KeyboardInterrupt:

2863

2202

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

2864

2203

cleanup()

2865

2204

2205

2866

2206

if __name__ == '__main__':

2867

2207

main()