/mandos/trunk : revision 729

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#!/usr/bin/python

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#!/usr/bin/python2.7

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

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#

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

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import 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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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.5.2"

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version = "1.6.8"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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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 = None

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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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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struct.pack(b"16s16x", interface))

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interface_index = struct.unpack("I", ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler

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(facility =

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logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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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.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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self.gnupg.options.extra_args.extend(['--force-mdc',

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'--quiet',

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'--no-use-agent'])

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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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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 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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return b"mandos" + binascii.hexlify(password)

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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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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--symmetric'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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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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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--decrypt'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin'] ) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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class AvahiError(Exception):

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

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self.value = value

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

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def __unicode__(self):

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return unicode(repr(self.value))

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

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**kwargs)

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class AvahiServiceError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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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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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: %s"

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% unicode(error))

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

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.format(error))

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def cleanup(self):

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

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if self.group is not None:

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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)

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

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

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% self.name))

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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

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

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"last_approval_request", "last_checked_ok",

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

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

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"extended_timeout": "15m",

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"interval": "2m",

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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": "0s",

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"approval_duration": "1s",

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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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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@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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"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 %s"

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% section)

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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client["last_checker_status"] = -2

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return settings

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

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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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for setting, value in settings.items():

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setattr(self, setting, value)

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if self.enabled:

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else:

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self.last_enabled = None

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self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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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

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self.checker = None

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self.checker_initiator_tag = None

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

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# Already enabled

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return

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self.send_changedstate()

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

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

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if not quiet:

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self.send_changedstate()

581

if not quiet:

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

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

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

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gobject.source_remove(self.disable_initiator_tag)

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582

self.disable_initiator_tag = None

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self.expires = None

587

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

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

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

589

if not quiet:

590

self.send_changedstate()

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

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return False

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def init_checker(self):

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

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# and every interval from then on.

600

if self.checker_initiator_tag is not None:

601

gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = (gobject.timeout_add

602

(self.interval_milliseconds(),

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(int(self.interval

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.total_seconds() * 1000),

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self.start_checker))

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

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = (gobject.timeout_add

606

(self.timeout_milliseconds(),

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self.disable))

610

(int(self.timeout

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.total_seconds() * 1000),

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self.disable))

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# Also start a new checker *right now*.

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self.start_checker()

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615

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timeout = self.timeout

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

646

self.disable_initiator_tag = None

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

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self.disable_initiator_tag = (gobject.timeout_add

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(timedelta_to_milliseconds

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(timeout), self.disable))

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(int(timeout.total_seconds()

650

* 1000), self.disable))

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

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def need_approval(self):

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If a checker already exists, leave it running and do

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nothing."""

655

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

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

657

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

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# client would inevitably timeout, since no checker would get

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

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

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

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# would inevitably timeout, since no checker would get a

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

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

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

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# should be.

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

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try:

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

667

except (AttributeError, OSError) as error:

668

if (isinstance(error, OSError)

669

and error.errno != errno.ECHILD):

670

raise error

673

except AttributeError:

674

pass

675

except OSError as error:

676

if error.errno != errno.ECHILD:

677

raise

671

678

else:

672

679

if pid:

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logger.warning("Checker was a zombie")

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683

self.current_checker_command)

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# Start a new checker if needed

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if self.checker is None:

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# Escape attributes for the shell

687

escaped_attrs = { attr:

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re.escape(unicode(getattr(self,

689

attr)))

690

for attr in self.runtime_expansions }

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try:

680

# In case checker_command has exactly one % operator

681

command = self.checker_command % self.host

682

except TypeError:

683

# Escape attributes for the shell

684

escaped_attrs = dict(

685

(attr,

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

687

errors=

688

'replace')))

689

for attr in

690

self.runtime_expansions)

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try:

693

command = self.checker_command % escaped_attrs

694

except TypeError as error:

695

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

696

' %s', self.checker_command, error)

697

return True # Try again later

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command = self.checker_command % escaped_attrs

693

except TypeError as error:

694

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

695

self.checker_command, exc_info=error)

696

return True # Try again later

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self.current_checker_command = command

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try:

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699

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

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702

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

704

703

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

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# always replaced by /dev/null.)

705

# The exception is when not debugging but nevertheless

706

# running in the foreground; use the previously

707

# created wnull.

708

popen_args = {}

709

if (not self.server_settings["debug"]

710

and self.server_settings["foreground"]):

711

popen_args.update({"stdout": wnull,

712

"stderr": wnull })

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self.checker = subprocess.Popen(command,

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close_fds=True,

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shell=True, cwd="/")

709

self.checker_callback_tag = (gobject.child_watch_add

710

(self.checker.pid,

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self.checker_callback,

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data=command))

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# The checker may have completed before the gobject

714

# watch was added. Check for this.

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shell=True, cwd="/",

716

**popen_args)

717

except OSError as error:

718

logger.error("Failed to start subprocess",

719

exc_info=error)

720

return True

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self.checker_callback_tag = (gobject.child_watch_add

722

(self.checker.pid,

723

self.checker_callback,

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data=command))

725

# The checker may have completed before the gobject

726

# watch was added. Check for this.

727

try:

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728

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

716

if pid:

717

gobject.source_remove(self.checker_callback_tag)

718

self.checker_callback(pid, status, command)

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729

except OSError as error:

720

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

721

error)

730

if error.errno == errno.ECHILD:

731

# This should never happen

732

logger.error("Child process vanished",

733

exc_info=error)

734

return True

735

raise

736

if pid:

737

gobject.source_remove(self.checker_callback_tag)

738

self.checker_callback(pid, status, command)

722

739

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

723

740

return True

724

741

731

748

return

732

749

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

733

750

try:

734

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

751

self.checker.terminate()

735

752

#time.sleep(0.5)

736

753

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

737

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

754

# self.checker.kill()

738

755

except OSError as error:

739

756

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

740

757

raise

757

774

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

758

775

if byte_arrays and signature != "ay":

759

776

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

760

" signature %r" % signature)

777

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

761

778

def decorator(func):

762

779

func._dbus_is_property = True

763

780

func._dbus_interface = dbus_interface

771

788

return decorator

772

789

773

790

791

def dbus_interface_annotations(dbus_interface):

792

"""Decorator for marking functions returning interface annotations

793

794

Usage:

795

796

@dbus_interface_annotations("org.example.Interface")

797

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

798

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

799

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

800

"false"}

801

"""

802

def decorator(func):

803

func._dbus_is_interface = True

804

func._dbus_interface = dbus_interface

805

func._dbus_name = dbus_interface

806

return func

807

return decorator

808

809

810

def dbus_annotations(annotations):

811

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

812

Usage:

813

814

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

815

access="r")

816

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

817

"org.freedesktop.DBus.Property."

818

"EmitsChangedSignal": "false"})

819

def Property_dbus_property(self):

820

return dbus.Boolean(False)

821

"""

822

def decorator(func):

823

func._dbus_annotations = annotations

824

return func

825

return decorator

826

827

774

828

class DBusPropertyException(dbus.exceptions.DBusException):

775

829

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

776

830

"""

777

def __unicode__(self):

778

return unicode(str(self))

779

831

pass

780

832

781

833

class DBusPropertyAccessException(DBusPropertyException):

782

834

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

799

851

"""

800

852

801

853

@staticmethod

802

def _is_dbus_property(obj):

803

return getattr(obj, "_dbus_is_property", False)

854

def _is_dbus_thing(thing):

855

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

856

857

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

858

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

859

"""

860

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

861

False)

804

862

805

def _get_all_dbus_properties(self):

863

def _get_all_dbus_things(self, thing):

806

864

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

807

865

"""

808

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

866

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

867

name),

868

athing.__get__(self))

809

869

for cls in self.__class__.__mro__

810

for name, prop in

811

inspect.getmembers(cls, self._is_dbus_property))

870

for name, athing in

871

inspect.getmembers(cls,

872

self._is_dbus_thing(thing)))

812

873

813

874

def _get_dbus_property(self, interface_name, property_name):

814

875

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

816

877

"""

817

878

for cls in self.__class__.__mro__:

818

879

for name, value in (inspect.getmembers

819

(cls, self._is_dbus_property)):

880

(cls,

881

self._is_dbus_thing("property"))):

820

882

if (value._dbus_name == property_name

821

883

and value._dbus_interface == interface_name):

822

884

return value.__get__(self)

850

912

# The byte_arrays option is not supported yet on

851

913

# signatures other than "ay".

852

914

if prop._dbus_signature != "ay":

853

raise ValueError

915

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

916

"'ay' signature {!r}"

917

.format(prop._dbus_signature))

854

918

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

855

919

for byte in value))

856

920

prop(value)

864

928

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

865

929

"""

866

930

properties = {}

867

for name, prop in self._get_all_dbus_properties():

931

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

868

932

if (interface_name

869

933

and interface_name != prop._dbus_interface):

870

934

# Interface non-empty but did not match

885

949

path_keyword='object_path',

886

950

connection_keyword='connection')

887

951

def Introspect(self, object_path, connection):

888

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

952

"""Overloading of standard D-Bus method.

953

954

Inserts property tags and interface annotation tags.

889

955

"""

890

956

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

891

957

connection)

898

964

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

899

965

return e

900

966

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

967

# Add property tags

901

968

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

902

969

for name, prop

903

in self._get_all_dbus_properties()

970

in self._get_all_dbus_things("property")

904

971

if prop._dbus_interface

905

972

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

906

973

if_tag.appendChild(tag)

974

# Add annotation tags

975

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

976

for tag in if_tag.getElementsByTagName(typ):

977

annots = dict()

978

for name, prop in (self.

979

_get_all_dbus_things(typ)):

980

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

981

and prop._dbus_interface

982

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

983

annots.update(getattr

984

(prop,

985

"_dbus_annotations",

986

{}))

987

for name, value in annots.items():

988

ann_tag = document.createElement(

989

"annotation")

990

ann_tag.setAttribute("name", name)

991

ann_tag.setAttribute("value", value)

992

tag.appendChild(ann_tag)

993

# Add interface annotation tags

994

for annotation, value in dict(

995

itertools.chain.from_iterable(

996

annotations().items()

997

for name, annotations in

998

self._get_all_dbus_things("interface")

999

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

1000

)).items():

1001

ann_tag = document.createElement("annotation")

1002

ann_tag.setAttribute("name", annotation)

1003

ann_tag.setAttribute("value", value)

1004

if_tag.appendChild(ann_tag)

907

1005

# Add the names to the return values for the

908

1006

# "org.freedesktop.DBus.Properties" methods

909

1007

if (if_tag.getAttribute("name")

924

1022

except (AttributeError, xml.dom.DOMException,

925

1023

xml.parsers.expat.ExpatError) as error:

926

1024

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

927

error)

1025

exc_info=error)

928

1026

return xmlstring

929

1027

930

1028

931

def datetime_to_dbus (dt, variant_level=0):

1029

def datetime_to_dbus(dt, variant_level=0):

932

1030

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

933

1031

if dt is None:

934

1032

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

936

1034

variant_level=variant_level)

937

1035

938

1036

939

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

940

.__metaclass__):

941

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

942

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

1037

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1038

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

1039

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

1040

interface names according to the "alt_interface_names" mapping.

1041

Usage:

1042

1043

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

1044

"net.example.AlternateInterface"})

1045

class SampleDBusObject(dbus.service.Object):

1046

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

1047

def SampleDBusMethod():

1048

pass

1049

1050

The above "SampleDBusMethod" on "SampleDBusObject" will be

1051

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

1052

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

1053

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

1054

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

1055

1056

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

1057

(from DBusObjectWithProperties) and interfaces (from the

1058

dbus_interface_annotations decorator).

943

1059

"""

944

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

945

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

946

# methods, signals, or properties in them

947

for base in (b for b in bases

948

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

949

# Go though all attributes of the base class

950

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

1060

def wrapper(cls):

1061

for orig_interface_name, alt_interface_name in (

1062

alt_interface_names.items()):

1063

attr = {}

1064

interface_names = set()

1065

# Go though all attributes of the class

1066

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

951

1067

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

952

1068

# with the wrong interface name

953

1069

if (not hasattr(attribute, "_dbus_interface")

954

1070

or not attribute._dbus_interface

955

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

1071

.startswith(orig_interface_name)):

956

1072

continue

957

1073

# Create an alternate D-Bus interface name based on

958

1074

# the current name

959

1075

alt_interface = (attribute._dbus_interface

960

.replace("se.recompile.Mandos",

961

"se.bsnet.fukt.Mandos"))

1076

.replace(orig_interface_name,

1077

alt_interface_name))

1078

interface_names.add(alt_interface)

962

1079

# Is this a D-Bus signal?

963

1080

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

964

# Extract the original non-method function by

965

# black magic

1081

# Extract the original non-method undecorated

1082

# function by black magic

966

1083

nonmethod_func = (dict(

967

1084

zip(attribute.func_code.co_freevars,

968

1085

attribute.__closure__))["func"]

979

1096

nonmethod_func.func_name,

980

1097

nonmethod_func.func_defaults,

981

1098

nonmethod_func.func_closure)))

1099

# Copy annotations, if any

1100

try:

1101

new_function._dbus_annotations = (

1102

dict(attribute._dbus_annotations))

1103

except AttributeError:

1104

pass

982

1105

# Define a creator of a function to call both the

983

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

984

# signals gets sent when the function is called

1106

# original and alternate functions, so both the

1107

# original and alternate signals gets sent when

1108

# the function is called

985

1109

def fixscope(func1, func2):

986

1110

"""This function is a scope container to pass

987

1111

func1 and func2 to the "call_both" function

994

1118

return call_both

995

1119

# Create the "call_both" function and add it to

996

1120

# the class

997

attr[attrname] = fixscope(attribute,

998

new_function)

1121

attr[attrname] = fixscope(attribute, new_function)

999

1122

# Is this a D-Bus method?

1000

1123

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

1001

1124

# Create a new, but exactly alike, function

1012

1135

attribute.func_name,

1013

1136

attribute.func_defaults,

1014

1137

attribute.func_closure)))

1138

# Copy annotations, if any

1139

try:

1140

attr[attrname]._dbus_annotations = (

1141

dict(attribute._dbus_annotations))

1142

except AttributeError:

1143

pass

1015

1144

# Is this a D-Bus property?

1016

1145

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

1017

1146

# Create a new, but exactly alike, function

1031

1160

attribute.func_name,

1032

1161

attribute.func_defaults,

1033

1162

attribute.func_closure)))

1034

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

1035

1036

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1169

# Is this a D-Bus interface?

1170

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

1171

# Create a new, but exactly alike, function

1172

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

1173

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

1174

# to the class.

1175

attr[attrname] = (dbus_interface_annotations

1176

(alt_interface)

1177

(types.FunctionType

1178

(attribute.func_code,

1179

attribute.func_globals,

1180

attribute.func_name,

1181

attribute.func_defaults,

1182

attribute.func_closure)))

1183

if deprecate:

1184

# Deprecate all alternate interfaces

1185

iname="_AlternateDBusNames_interface_annotation{}"

1186

for interface_name in interface_names:

1187

@dbus_interface_annotations(interface_name)

1188

def func(self):

1189

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

1190

"true" }

1191

# Find an unused name

1192

for aname in (iname.format(i)

1193

for i in itertools.count()):

1194

if aname not in attr:

1195

attr[aname] = func

1196

break

1197

if interface_names:

1198

# Replace the class with a new subclass of it with

1199

# methods, signals, etc. as created above.

1200

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

1201

(cls,), attr)

1202

return cls

1203

return wrapper

1204

1205

1206

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

1207

"se.bsnet.fukt.Mandos"})

1037

1208

class ClientDBus(Client, DBusObjectWithProperties):

1038

1209

"""A Client class using D-Bus

1039

1210

1059

1230

("/clients/" + client_object_name))

1060

1231

DBusObjectWithProperties.__init__(self, self.bus,

1061

1232

self.dbus_object_path)

1062

1233

1063

1234

def notifychangeproperty(transform_func,

1064

1235

dbus_name, type_func=lambda x: x,

1065

1236

variant_level=1):

1073

1244

to the D-Bus. Default: no transform

1074

1245

variant_level: D-Bus variant level. Default: 1

1075

1246

"""

1076

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

1247

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

1077

1248

def setter(self, value):

1078

1249

if hasattr(self, "dbus_object_path"):

1079

1250

if (not hasattr(self, attrname) or

1088

1259

1089

1260

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

1090

1261

1091

1092

1262

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1093

1263

approvals_pending = notifychangeproperty(dbus.Boolean,

1094

1264

"ApprovalPending",

1110

1280

approval_delay = notifychangeproperty(dbus.UInt64,

1111

1281

"ApprovalDelay",

1112

1282

type_func =

1113

timedelta_to_milliseconds)

1283

lambda td: td.total_seconds()

1284

* 1000)

1114

1285

approval_duration = notifychangeproperty(

1115

1286

dbus.UInt64, "ApprovalDuration",

1116

type_func = timedelta_to_milliseconds)

1287

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

1117

1288

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

1118

1289

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

1119

type_func =

1120

timedelta_to_milliseconds)

1290

type_func = lambda td:

1291

td.total_seconds() * 1000)

1121

1292

extended_timeout = notifychangeproperty(

1122

1293

dbus.UInt64, "ExtendedTimeout",

1123

type_func = timedelta_to_milliseconds)

1294

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

1124

1295

interval = notifychangeproperty(dbus.UInt64,

1125

1296

"Interval",

1126

1297

type_func =

1127

timedelta_to_milliseconds)

1298

lambda td: td.total_seconds()

1299

* 1000)

1128

1300

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

1129

1301

1130

1302

del notifychangeproperty

1158

1330

*args, **kwargs)

1159

1331

1160

1332

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

1161

old_checker = self.checker

1162

if self.checker is not None:

1163

old_checker_pid = self.checker.pid

1164

else:

1165

old_checker_pid = None

1333

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

1166

1334

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

1167

1335

# Only if new checker process was started

1168

1336

if (self.checker is not None

1176

1344

return False

1177

1345

1178

1346

def approve(self, value=True):

1179

self.send_changedstate()

1180

1347

self.approved = value

1181

gobject.timeout_add(timedelta_to_milliseconds

1182

(self.approval_duration),

1183

self._reset_approved)

1184

1348

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

1349

* 1000), self._reset_approved)

1350

self.send_changedstate()

1185

1351

1186

1352

## D-Bus methods, signals & properties

1187

1353

_interface = "se.recompile.Mandos.Client"

1188

1354

1355

## Interfaces

1356

1357

@dbus_interface_annotations(_interface)

1358

def _foo(self):

1359

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

1360

"false"}

1361

1189

1362

## Signals

1190

1363

1191

1364

# CheckerCompleted - signal

1282

1455

access="readwrite")

1283

1456

def ApprovalDelay_dbus_property(self, value=None):

1284

1457

if value is None: # get

1285

return dbus.UInt64(self.approval_delay_milliseconds())

1458

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

1459

* 1000)

1286

1460

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

1287

1461

1288

1462

# ApprovalDuration - property

1290

1464

access="readwrite")

1291

1465

def ApprovalDuration_dbus_property(self, value=None):

1292

1466

if value is None: # get

1293

return dbus.UInt64(timedelta_to_milliseconds(

1294

self.approval_duration))

1467

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

1468

* 1000)

1295

1469

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

1296

1470

1297

1471

# Name - property

1363

1537

access="readwrite")

1364

1538

def Timeout_dbus_property(self, value=None):

1365

1539

if value is None: # get

1366

return dbus.UInt64(self.timeout_milliseconds())

1540

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

1541

old_timeout = self.timeout

1367

1542

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

1368

# Reschedule timeout

1543

# Reschedule disabling

1369

1544

if self.enabled:

1370

1545

now = datetime.datetime.utcnow()

1371

time_to_die = timedelta_to_milliseconds(

1372

(self.last_checked_ok + self.timeout) - now)

1373

if time_to_die <= 0:

1546

self.expires += self.timeout - old_timeout

1547

if self.expires <= now:

1374

1548

# The timeout has passed

1375

1549

self.disable()

1376

1550

else:

1377

self.expires = (now +

1378

datetime.timedelta(milliseconds =

1379

time_to_die))

1380

1551

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

1381

1552

is None):

1382

1553

return

1383

1554

gobject.source_remove(self.disable_initiator_tag)

1384

self.disable_initiator_tag = (gobject.timeout_add

1385

(time_to_die,

1386

self.disable))

1555

self.disable_initiator_tag = (

1556

gobject.timeout_add(

1557

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

1558

* 1000), self.disable))

1387

1559

1388

1560

# ExtendedTimeout - property

1389

1561

@dbus_service_property(_interface, signature="t",

1390

1562

access="readwrite")

1391

1563

def ExtendedTimeout_dbus_property(self, value=None):

1392

1564

if value is None: # get

1393

return dbus.UInt64(self.extended_timeout_milliseconds())

1565

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

1566

* 1000)

1394

1567

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

1395

1568

1396

1569

# Interval - property

1398

1571

access="readwrite")

1399

1572

def Interval_dbus_property(self, value=None):

1400

1573

if value is None: # get

1401

return dbus.UInt64(self.interval_milliseconds())

1574

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

1402

1575

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

1403

1576

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

1404

1577

return

1437

1610

@dbus_service_property(_interface, signature="ay",

1438

1611

access="write", byte_arrays=True)

1439

1612

def Secret_dbus_property(self, value):

1440

self.secret = str(value)

1613

self.secret = bytes(value)

1441

1614

1442

1615

del _interface

1443

1616

1468

1641

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

1469

1642

1470

1643

1471

class ClientDBusTransitional(ClientDBus):

1472

__metaclass__ = AlternateDBusNamesMetaclass

1473

1474

1475

1644

class ClientHandler(socketserver.BaseRequestHandler, object):

1476

1645

"""A class to handle client connections.

1477

1646

1513

1682

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

1514

1683

try:

1515

1684

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

1516

raise RuntimeError

1685

raise RuntimeError(line)

1517

1686

except (ValueError, IndexError, RuntimeError) as error:

1518

1687

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

1519

1688

return

1568

1737

if self.server.use_dbus:

1569

1738

# Emit D-Bus signal

1570

1739

client.NeedApproval(

1571

client.approval_delay_milliseconds(),

1572

client.approved_by_default)

1740

client.approval_delay.total_seconds()

1741

* 1000, client.approved_by_default)

1573

1742

else:

1574

1743

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

1575

1744

client.name)

1581

1750

#wait until timeout or approved

1582

1751

time = datetime.datetime.now()

1583

1752

client.changedstate.acquire()

1584

(client.changedstate.wait

1585

(float(client.timedelta_to_milliseconds(delay)

1586

/ 1000)))

1753

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

1587

1754

client.changedstate.release()

1588

1755

time2 = datetime.datetime.now()

1589

1756

if (time2 - time) >= delay:

1605

1772

try:

1606

1773

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

1607

1774

except gnutls.errors.GNUTLSError as error:

1608

logger.warning("gnutls send failed")

1775

logger.warning("gnutls send failed",

1776

exc_info=error)

1609

1777

return

1610

1778

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

1611

1779

sent, len(client.secret)

1625

1793

try:

1626

1794

session.bye()

1627

1795

except gnutls.errors.GNUTLSError as error:

1628

logger.warning("GnuTLS bye failed")

1796

logger.warning("GnuTLS bye failed",

1797

exc_info=error)

1629

1798

1630

1799

@staticmethod

1631

1800

def peer_certificate(session):

1703

1872

def process_request(self, request, address):

1704

1873

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

1705

1874

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

1706

args = (request,

1707

address))

1875

args = (request, address))

1708

1876

proc.start()

1709

1877

return proc

1710

1878

1725

1893

1726

1894

def add_pipe(self, parent_pipe, proc):

1727

1895

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

1728

raise NotImplementedError

1896

raise NotImplementedError()

1729

1897

1730

1898

1731

1899

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1738

1906

use_ipv6: Boolean; to use IPv6 or not

1739

1907

"""

1740

1908

def __init__(self, server_address, RequestHandlerClass,

1741

interface=None, use_ipv6=True):

1909

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

1910

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

1911

creating a new one with socket.socket().

1912

"""

1742

1913

self.interface = interface

1743

1914

if use_ipv6:

1744

1915

self.address_family = socket.AF_INET6

1916

if socketfd is not None:

1917

# Save the file descriptor

1918

self.socketfd = socketfd

1919

# Save the original socket.socket() function

1920

self.socket_socket = socket.socket

1921

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

1922

#

1923

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

1924

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

1925

# patching socket.socket.)

1926

#

1927

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

1928

@functools.wraps(socket.socket)

1929

def socket_wrapper(*args, **kwargs):

1930

# Restore original function so subsequent calls are

1931

# not affected.

1932

socket.socket = self.socket_socket

1933

del self.socket_socket

1934

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

1935

# saved file descriptor.

1936

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

1937

# Replace socket.socket() function with wrapper

1938

socket.socket = socket_wrapper

1939

# The socketserver.TCPServer.__init__ will call

1940

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

1941

# socket_wrapper(), if socketfd was set.

1745

1942

socketserver.TCPServer.__init__(self, server_address,

1746

1943

RequestHandlerClass)

1944

1747

1945

def server_bind(self):

1748

1946

"""This overrides the normal server_bind() function

1749

1947

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

1757

1955

try:

1758

1956

self.socket.setsockopt(socket.SOL_SOCKET,

1759

1957

SO_BINDTODEVICE,

1760

str(self.interface

1761

+ '\0'))

1958

(self.interface + "\0")

1959

.encode("utf-8"))

1762

1960

except socket.error as error:

1763

if error[0] == errno.EPERM:

1764

logger.error("No permission to"

1765

" bind to interface %s",

1766

self.interface)

1767

elif error[0] == errno.ENOPROTOOPT:

1961

if error.errno == errno.EPERM:

1962

logger.error("No permission to bind to"

1963

" interface %s", self.interface)

1964

elif error.errno == errno.ENOPROTOOPT:

1768

1965

logger.error("SO_BINDTODEVICE not available;"

1769

1966

" cannot bind to interface %s",

1770

1967

self.interface)

1968

elif error.errno == errno.ENODEV:

1969

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

1970

" cannot bind", self.interface)

1771

1971

else:

1772

1972

raise

1773

1973

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

1776

1976

if self.address_family == socket.AF_INET6:

1777

1977

any_address = "::" # in6addr_any

1778

1978

else:

1779

any_address = socket.INADDR_ANY

1979

any_address = "0.0.0.0" # INADDR_ANY

1780

1980

self.server_address = (any_address,

1781

1981

self.server_address[1])

1782

1982

elif not self.server_address[1]:

1803

2003

"""

1804

2004

def __init__(self, server_address, RequestHandlerClass,

1805

2005

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

1806

gnutls_priority=None, use_dbus=True):

2006

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

1807

2007

self.enabled = False

1808

2008

self.clients = clients

1809

2009

if self.clients is None:

1813

2013

IPv6_TCPServer.__init__(self, server_address,

1814

2014

RequestHandlerClass,

1815

2015

interface = interface,

1816

use_ipv6 = use_ipv6)

2016

use_ipv6 = use_ipv6,

2017

socketfd = socketfd)

1817

2018

def server_activate(self):

1818

2019

if self.enabled:

1819

2020

return socketserver.TCPServer.server_activate(self)

1832

2033

1833

2034

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

1834

2035

proc = None, client_object=None):

1835

condition_names = {

1836

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

1837

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

1838

# blocking).

1839

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

1840

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

1841

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

1842

# broken, usually for pipes and

1843

# sockets).

1844

}

1845

conditions_string = ' | '.join(name

1846

for cond, name in

1847

condition_names.iteritems()

1848

if cond & condition)

1849

2036

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

1850

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

2037

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

1851

2038

# Wait for other process to exit

1852

2039

proc.join()

1853

2040

return False

1911

2098

return True

1912

2099

1913

2100

2101

def rfc3339_duration_to_delta(duration):

2102

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

2103

2104

>>> rfc3339_duration_to_delta("P7D")

2105

datetime.timedelta(7)

2106

>>> rfc3339_duration_to_delta("PT60S")

2107

datetime.timedelta(0, 60)

2108

>>> rfc3339_duration_to_delta("PT60M")

2109

datetime.timedelta(0, 3600)

2110

>>> rfc3339_duration_to_delta("PT24H")

2111

datetime.timedelta(1)

2112

>>> rfc3339_duration_to_delta("P1W")

2113

datetime.timedelta(7)

2114

>>> rfc3339_duration_to_delta("PT5M30S")

2115

datetime.timedelta(0, 330)

2116

>>> rfc3339_duration_to_delta("P1DT3M20S")

2117

datetime.timedelta(1, 200)

2118

"""

2119

2120

# Parsing an RFC 3339 duration with regular expressions is not

2121

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

2122

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

2123

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

2124

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

2125

# avoid excessive use of external libraries.

2126

2127

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

2128

Token = collections.namedtuple("Token",

2129

("regexp", # To match token; if

2130

# "value" is not None,

2131

# must have a "group"

2132

# containing digits

2133

"value", # datetime.timedelta or

2134

# None

2135

"followers")) # Tokens valid after

2136

# this token

2137

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

2138

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

2139

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

2140

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

2141

datetime.timedelta(seconds=1),

2142

frozenset((token_end,)))

2143

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

2144

datetime.timedelta(minutes=1),

2145

frozenset((token_second, token_end)))

2146

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

2147

datetime.timedelta(hours=1),

2148

frozenset((token_minute, token_end)))

2149

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

2150

None,

2151

frozenset((token_hour, token_minute,

2152

token_second)))

2153

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

2154

datetime.timedelta(days=1),

2155

frozenset((token_time, token_end)))

2156

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

2157

datetime.timedelta(weeks=4),

2158

frozenset((token_day, token_end)))

2159

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

2160

datetime.timedelta(weeks=52),

2161

frozenset((token_month, token_end)))

2162

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

2163

datetime.timedelta(weeks=1),

2164

frozenset((token_end,)))

2165

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

2166

frozenset((token_year, token_month,

2167

token_day, token_time,

2168

token_week)))

2169

# Define starting values

2170

value = datetime.timedelta() # Value so far

2171

found_token = None

2172

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

2173

s = duration # String left to parse

2174

# Loop until end token is found

2175

while found_token is not token_end:

2176

# Search for any currently valid tokens

2177

for token in followers:

2178

match = token.regexp.match(s)

2179

if match is not None:

2180

# Token found

2181

if token.value is not None:

2182

# Value found, parse digits

2183

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

2184

# Add to value so far

2185

value += factor * token.value

2186

# Strip token from string

2187

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

2188

# Go to found token

2189

found_token = token

2190

# Set valid next tokens

2191

followers = found_token.followers

2192

break

2193

else:

2194

# No currently valid tokens were found

2195

raise ValueError("Invalid RFC 3339 duration")

2196

# End token found

2197

return value

2198

2199

1914

2200

def string_to_delta(interval):

1915

2201

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

1916

2202

1927

2213

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

1928

2214

datetime.timedelta(0, 330)

1929

2215

"""

2216

2217

try:

2218

return rfc3339_duration_to_delta(interval)

2219

except ValueError:

2220

pass

2221

1930

2222

timevalue = datetime.timedelta(0)

1931

2223

for s in interval.split():

1932

2224

try:

1933

suffix = unicode(s[-1])

2225

suffix = s[-1]

1934

2226

value = int(s[:-1])

1935

2227

if suffix == "d":

1936

2228

delta = datetime.timedelta(value)

1943

2235

elif suffix == "w":

1944

2236

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

1945

2237

else:

1946

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

1947

except (ValueError, IndexError) as e:

2238

raise ValueError("Unknown suffix {!r}"

2239

.format(suffix))

2240

except IndexError as e:

1948

2241

raise ValueError(*(e.args))

1949

2242

timevalue += delta

1950

2243

return timevalue

1963

2256

sys.exit()

1964

2257

if not noclose:

1965

2258

# Close all standard open file descriptors

1966

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

2259

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

1967

2260

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

1968

raise OSError(errno.ENODEV,

1969

"%s not a character device"

1970

% os.path.devnull)

2261

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

2262

.format(os.devnull))

1971

2263

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

1972

2264

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

1973

2265

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

1982

2274

1983

2275

parser = argparse.ArgumentParser()

1984

2276

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

1985

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

2277

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

1986

2278

help="show version number and exit")

1987

2279

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

1988

2280

help="Bind to interface IF")

1994

2286

help="Run self-test")

1995

2287

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

1996

2288

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

1997

" to terminal")

2289

" to terminal", default=None)

1998

2290

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

1999

2291

help="Debug level for stdout output")

2000

2292

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

2007

2299

" files")

2008

2300

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

2009

2301

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

2010

" system bus interface")

2302

" system bus interface", default=None)

2011

2303

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

2012

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

2304

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

2305

default=None)

2013

2306

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

2014

2307

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

2015

" state")

2308

" state", default=None)

2309

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

2310

help="Specify a file descriptor to a network"

2311

" socket to use instead of creating one")

2016

2312

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

2017

2313

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

2314

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

2315

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

2316

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

2317

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

2318

default=None)

2018

2319

2019

2320

options = parser.parse_args()

2020

2321

2021

2322

if options.check:

2022

2323

import doctest

2023

doctest.testmod()

2024

sys.exit()

2324

fail_count, test_count = doctest.testmod()

2325

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

2025

2326

2026

2327

# Default values for config file for server-global settings

2027

2328

server_defaults = { "interface": "",

2029

2330

"port": "",

2030

2331

"debug": "False",

2031

2332

"priority":

2032

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

2333

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

2033

2334

"servicename": "Mandos",

2034

2335

"use_dbus": "True",

2035

2336

"use_ipv6": "True",

2036

2337

"debuglevel": "",

2037

2338

"restore": "True",

2038

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

2339

"socket": "",

2340

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

2341

"foreground": "False",

2342

"zeroconf": "True",

2039

2343

}

2040

2344

2041

2345

# Parse config file for server-global settings

2046

2350

# Convert the SafeConfigParser object to a dict

2047

2351

server_settings = server_config.defaults()

2048

2352

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

2049

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

2353

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

2050

2354

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

2051

2355

option)

2052

2356

if server_settings["port"]:

2053

2357

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

2054

2358

"port")

2359

if server_settings["socket"]:

2360

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

2361

"socket")

2362

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

2363

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

2364

# happen with a supplied network socket.

2365

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

2366

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

2367

["socket"])

2055

2368

del server_config

2056

2369

2057

2370

# Override the settings from the config file with command line

2059

2372

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

2060

2373

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

2061

2374

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

2062

"statedir"):

2375

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

2063

2376

value = getattr(options, option)

2064

2377

if value is not None:

2065

2378

server_settings[option] = value

2066

2379

del options

2067

2380

# Force all strings to be unicode

2068

2381

for option in server_settings.keys():

2069

if type(server_settings[option]) is str:

2070

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

2382

if isinstance(server_settings[option], bytes):

2383

server_settings[option] = (server_settings[option]

2384

.decode("utf-8"))

2385

# Force all boolean options to be boolean

2386

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

2387

"foreground", "zeroconf"):

2388

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

2389

# Debug implies foreground

2390

if server_settings["debug"]:

2391

server_settings["foreground"] = True

2071

2392

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

2072

2393

2073

2394

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

2074

2395

2396

if (not server_settings["zeroconf"] and

2397

not (server_settings["port"]

2398

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

2399

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

2400

" Zeroconf")

2401

2075

2402

# For convenience

2076

2403

debug = server_settings["debug"]

2077

2404

debuglevel = server_settings["debuglevel"]

2079

2406

use_ipv6 = server_settings["use_ipv6"]

2080

2407

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

2081

2408

stored_state_file)

2409

foreground = server_settings["foreground"]

2410

zeroconf = server_settings["zeroconf"]

2082

2411

2083

2412

if debug:

2084

2413

initlogger(debug, logging.DEBUG)

2091

2420

2092

2421

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

2093

2422

syslogger.setFormatter(logging.Formatter

2094

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

2095

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

2096

% server_settings["servicename"]))

2423

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

2424

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

2425

.format(server_settings

2426

["servicename"])))

2097

2427

2098

2428

# Parse config file with clients

2099

2429

client_config = configparser.SafeConfigParser(Client

2104

2434

global mandos_dbus_service

2105

2435

mandos_dbus_service = None

2106

2436

2437

socketfd = None

2438

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

2439

socketfd = server_settings["socket"]

2107

2440

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

2108

2441

server_settings["port"]),

2109

2442

ClientHandler,

2112

2445

use_ipv6=use_ipv6,

2113

2446

gnutls_priority=

2114

2447

server_settings["priority"],

2115

use_dbus=use_dbus)

2116

if not debug:

2117

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

2448

use_dbus=use_dbus,

2449

socketfd=socketfd)

2450

if not foreground:

2451

pidfilename = "/run/mandos.pid"

2452

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

2453

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

2454

pidfile = None

2118

2455

try:

2119

2456

pidfile = open(pidfilename, "w")

2120

except IOError:

2121

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

2457

except IOError as e:

2458

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

2459

exc_info=e)

2122

2460

2123

try:

2124

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

2125

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

2126

except KeyError:

2461

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

2127

2462

try:

2128

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

2129

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

2463

uid = pwd.getpwnam(name).pw_uid

2464

gid = pwd.getpwnam(name).pw_gid

2465

break

2130

2466

except KeyError:

2131

try:

2132

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

2133

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

2134

except KeyError:

2135

uid = 65534

2136

gid = 65534

2467

continue

2468

else:

2469

uid = 65534

2470

gid = 65534

2137

2471

try:

2138

2472

os.setgid(gid)

2139

2473

os.setuid(uid)

2140

2474

except OSError as error:

2141

if error[0] != errno.EPERM:

2142

raise error

2475

if error.errno != errno.EPERM:

2476

raise

2143

2477

2144

2478

if debug:

2145

2479

# Enable all possible GnuTLS debugging

2156

2490

.gnutls_global_set_log_function(debug_gnutls))

2157

2491

2158

2492

# Redirect stdin so all checkers get /dev/null

2159

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

2493

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

2160

2494

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

2161

2495

if null > 2:

2162

2496

os.close(null)

2163

2497

2164

2498

# Need to fork before connecting to D-Bus

2165

if not debug:

2499

if not foreground:

2166

2500

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

2167

2501

daemon()

2168

2502

2503

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

2504

# need to inform gobject that threads will be used.

2169

2505

gobject.threads_init()

2170

2506

2171

2507

global main_loop

2172

2508

# From the Avahi example code

2173

DBusGMainLoop(set_as_default=True )

2509

DBusGMainLoop(set_as_default=True)

2174

2510

main_loop = gobject.MainLoop()

2175

2511

bus = dbus.SystemBus()

2176

2512

# End of Avahi example code

2182

2518

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

2183

2519

do_not_queue=True))

2184

2520

except dbus.exceptions.NameExistsException as e:

2185

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

2521

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

2186

2522

use_dbus = False

2187

2523

server_settings["use_dbus"] = False

2188

2524

tcp_server.use_dbus = False

2189

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2190

service = AvahiServiceToSyslog(name =

2191

server_settings["servicename"],

2192

servicetype = "_mandos._tcp",

2193

protocol = protocol, bus = bus)

2194

if server_settings["interface"]:

2195

service.interface = (if_nametoindex

2196

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

2525

if zeroconf:

2526

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2527

service = AvahiServiceToSyslog(name =

2528

server_settings["servicename"],

2529

servicetype = "_mandos._tcp",

2530

protocol = protocol, bus = bus)

2531

if server_settings["interface"]:

2532

service.interface = (if_nametoindex

2533

(server_settings["interface"]

2534

.encode("utf-8")))

2197

2535

2198

2536

global multiprocessing_manager

2199

2537

multiprocessing_manager = multiprocessing.Manager()

2200

2538

2201

2539

client_class = Client

2202

2540

if use_dbus:

2203

client_class = functools.partial(ClientDBusTransitional,

2204

bus = bus)

2541

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

2205

2542

2206

2543

client_settings = Client.config_parser(client_config)

2207

2544

old_client_settings = {}

2208

2545

clients_data = {}

2209

2546

2547

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

2548

global wnull

2549

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

2550

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

2551

# mode

2552

if debug or not foreground:

2553

wnull.close()

2554

2210

2555

# Get client data and settings from last running state.

2211

2556

if server_settings["restore"]:

2212

2557

try:

2215

2560

(stored_state))

2216

2561

os.remove(stored_state_path)

2217

2562

except IOError as e:

2218

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

2219

.format(e))

2220

if e.errno != errno.ENOENT:

2563

if e.errno == errno.ENOENT:

2564

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

2565

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

2566

else:

2567

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

2568

exc_info=e)

2221

2569

raise

2222

2570

except EOFError as e:

2223

2571

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

2224

"EOFError: {0}".format(e))

2572

"EOFError:", exc_info=e)

2225

2573

2226

2574

with PGPEngine() as pgp:

2227

for client_name, client in clients_data.iteritems():

2575

for client_name, client in clients_data.items():

2576

# Skip removed clients

2577

if client_name not in client_settings:

2578

continue

2579

2228

2580

# Decide which value to use after restoring saved state.

2229

2581

# We have three different values: Old config file,

2230

2582

# new config file, and saved state.

2251

2603

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

2252

2604

if not client["last_checked_ok"]:

2253

2605

logger.warning(

2254

"disabling client {0} - Client never "

2606

"disabling client {} - Client never "

2255

2607

"performed a successful checker"

2256

2608

.format(client_name))

2257

2609

client["enabled"] = False

2258

2610

elif client["last_checker_status"] != 0:

2259

2611

logger.warning(

2260

"disabling client {0} - Client "

2261

"last checker failed with error code {1}"

2612

"disabling client {} - Client last"

2613

" checker failed with error code {}"

2262

2614

.format(client_name,

2263

2615

client["last_checker_status"]))

2264

2616

client["enabled"] = False

2267

2619

.utcnow()

2268

2620

+ client["timeout"])

2269

2621

logger.debug("Last checker succeeded,"

2270

" keeping {0} enabled"

2622

" keeping {} enabled"

2271

2623

.format(client_name))

2272

2624

try:

2273

2625

client["secret"] = (

2276

2628

["secret"]))

2277

2629

except PGPError:

2278

2630

# If decryption fails, we use secret from new settings

2279

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

2631

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

2280

2632

.format(client_name))

2281

2633

client["secret"] = (

2282

2634

client_settings[client_name]["secret"])

2283

2284

2635

2285

2636

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

2286

2637

for client_name in (set(old_client_settings)

2289

2640

for client_name in (set(client_settings)

2290

2641

- set(old_client_settings)):

2291

2642

clients_data[client_name] = client_settings[client_name]

2292

2643

2293

2644

# Create all client objects

2294

for client_name, client in clients_data.iteritems():

2645

for client_name, client in clients_data.items():

2295

2646

tcp_server.clients[client_name] = client_class(

2296

name = client_name, settings = client)

2647

name = client_name, settings = client,

2648

server_settings = server_settings)

2297

2649

2298

2650

if not tcp_server.clients:

2299

2651

logger.warning("No clients defined")

2300

2301

if not debug:

2302

try:

2303

with pidfile:

2304

pid = os.getpid()

2305

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

2306

del pidfile

2307

except IOError:

2308

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

2309

pidfilename, pid)

2310

except NameError:

2311

# "pidfile" was never created

2312

pass

2652

2653

if not foreground:

2654

if pidfile is not None:

2655

try:

2656

with pidfile:

2657

pid = os.getpid()

2658

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

2659

except IOError:

2660

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

2661

pidfilename, pid)

2662

del pidfile

2313

2663

del pidfilename

2314

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

2315

2664

2316

2665

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

2317

2666

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

2318

2667

2319

2668

if use_dbus:

2320

class MandosDBusService(dbus.service.Object):

2669

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

2670

"se.bsnet.fukt.Mandos"})

2671

class MandosDBusService(DBusObjectWithProperties):

2321

2672

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

2322

2673

def __init__(self):

2323

2674

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

2324

2675

_interface = "se.recompile.Mandos"

2325

2676

2677

@dbus_interface_annotations(_interface)

2678

def _foo(self):

2679

return { "org.freedesktop.DBus.Property"

2680

".EmitsChangedSignal":

2681

"false"}

2682

2326

2683

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

2327

2684

def ClientAdded(self, objpath):

2328

2685

"D-Bus signal"

2370

2727

2371

2728

del _interface

2372

2729

2373

class MandosDBusServiceTransitional(MandosDBusService):

2374

__metaclass__ = AlternateDBusNamesMetaclass

2375

mandos_dbus_service = MandosDBusServiceTransitional()

2730

mandos_dbus_service = MandosDBusService()

2376

2731

2377

2732

def cleanup():

2378

2733

"Cleanup function; run on exit"

2379

service.cleanup()

2734

if zeroconf:

2735

service.cleanup()

2380

2736

2381

2737

multiprocessing.active_children()

2738

wnull.close()

2382

2739

if not (tcp_server.clients or client_settings):

2383

2740

return

2384

2741

2395

2752

2396

2753

# A list of attributes that can not be pickled

2397

2754

# + secret.

2398

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

2399

"checker"))

2755

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

2756

"checker", "server_settings" }

2400

2757

for name, typ in (inspect.getmembers

2401

2758

(dbus.service.Object)):

2402

2759

exclude.add(name)

2411

2768

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

2412

2769

2413

2770

try:

2414

tempfd, tempname = tempfile.mkstemp(suffix=".pickle",

2415

prefix="clients-",

2416

dir=os.path.dirname

2417

(stored_state_path))

2418

with os.fdopen(tempfd, "wb") as stored_state:

2771

with (tempfile.NamedTemporaryFile

2772

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

2773

dir=os.path.dirname(stored_state_path),

2774

delete=False)) as stored_state:

2419

2775

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

2776

tempname=stored_state.name

2420

2777

os.rename(tempname, stored_state_path)

2421

2778

except (IOError, OSError) as e:

2422

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

2423

.format(e))

2424

2779

if not debug:

2425

2780

try:

2426

2781

os.remove(tempname)

2427

2782

except NameError:

2428

2783

pass

2429

if e.errno not in set((errno.ENOENT, errno.EACCES,

2430

errno.EEXIST)):

2431

raise e

2784

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

2785

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

2786

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

2787

else:

2788

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

2789

exc_info=e)

2790

raise

2432

2791

2433

2792

# Delete all clients, and settings from config

2434

2793

while tcp_server.clients:

2458

2817

tcp_server.server_activate()

2459

2818

2460

2819

# Find out what port we got

2461

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

2820

if zeroconf:

2821

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

2462

2822

if use_ipv6:

2463

2823

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

2464

" flowinfo %d, scope_id %d"

2465

% tcp_server.socket.getsockname())

2824

" flowinfo %d, scope_id %d",

2825

*tcp_server.socket.getsockname())

2466

2826

else: # IPv4

2467

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

2468

% tcp_server.socket.getsockname())

2827

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

2828

*tcp_server.socket.getsockname())

2469

2829

2470

2830

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

2471

2831

2472

2832

try:

2473

# From the Avahi example code

2474

try:

2475

service.activate()

2476

except dbus.exceptions.DBusException as error:

2477

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

2478

cleanup()

2479

sys.exit(1)

2480

# End of Avahi example code

2833

if zeroconf:

2834

# From the Avahi example code

2835

try:

2836

service.activate()

2837

except dbus.exceptions.DBusException as error:

2838

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

2839

cleanup()

2840

sys.exit(1)

2841

# End of Avahi example code

2481

2842

2482

2843

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

2483

2844

lambda *args, **kwargs:

2487

2848

logger.debug("Starting main loop")

2488

2849

main_loop.run()

2489

2850

except AvahiError as error:

2490

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

2851

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

2491

2852

cleanup()

2492

2853

sys.exit(1)

2493

2854

except KeyboardInterrupt: