/mandos/trunk : revision 539

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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 = "1.6.2"

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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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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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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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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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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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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

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

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.format(self.name)))

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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checker, or None.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"extended_timeout": "15m",

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"interval": "2m",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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with exceptions for any special settings as defined above"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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

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.replace(" ", ""))

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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% 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["checker_command"] = section["checker"]

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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client["last_checker_status"] = None

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if client["enabled"]:

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client["last_enabled"] = datetime.datetime.utcnow()

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client["expires"] = (datetime.datetime.utcnow()

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+ client["timeout"])

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else:

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client["last_enabled"] = None

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client["expires"] = None

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return settings

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

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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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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

598

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

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return False

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570

if not quiet:

571

self.send_changedstate()

572

if not quiet:

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

602

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

574

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

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gobject.source_remove(self.disable_initiator_tag)

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576

self.disable_initiator_tag = None

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577

self.expires = None

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

578

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

607

579

gobject.source_remove(self.checker_initiator_tag)

608

580

self.checker_initiator_tag = None

609

581

self.stop_checker()

610

582

self.enabled = False

611

if not quiet:

612

self.send_changedstate()

613

583

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

614

584

return False

615

585

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def init_checker(self):

620

590

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

621

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# and every interval from then on.

622

if self.checker_initiator_tag is not None:

623

gobject.source_remove(self.checker_initiator_tag)

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592

self.checker_initiator_tag = (gobject.timeout_add

625

593

(self.interval_milliseconds(),

626

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self.start_checker))

627

595

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

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

630

596

self.disable_initiator_tag = (gobject.timeout_add

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597

(self.timeout_milliseconds(),

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598

self.disable))

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

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618

vars(self))

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def checked_ok(self):

655

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

656

self.last_checked_ok = datetime.datetime.utcnow()

657

self.last_checker_status = 0

658

self.bump_timeout()

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660

def bump_timeout(self, timeout=None):

661

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

620

def checked_ok(self, timeout=None):

621

"""Bump up the timeout for this client.

622

623

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

624

alive and well.

625

"""

662

626

if timeout is None:

663

627

timeout = self.timeout

628

self.last_checked_ok = datetime.datetime.utcnow()

664

629

if self.disable_initiator_tag is not None:

665

630

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

667

631

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

668

632

self.disable_initiator_tag = (gobject.timeout_add

669

633

(timedelta_to_milliseconds

679

643

If a checker already exists, leave it running and do

680

644

nothing."""

681

645

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

682

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

683

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

684

# would inevitably timeout, since no checker would get a

685

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

646

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

647

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

648

# client would inevitably timeout, since no checker would get

649

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

686

650

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

687

651

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

688

652

# should be.

702

666

self.current_checker_command)

703

667

# Start a new checker if needed

704

668

if self.checker is None:

705

# Escape attributes for the shell

706

escaped_attrs = dict(

707

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

708

for attr in

709

self.runtime_expansions)

710

669

try:

711

command = self.checker_command % escaped_attrs

712

except TypeError as error:

713

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

714

self.checker_command, exc_info=error)

715

return True # Try again later

670

# In case checker_command has exactly one % operator

671

command = self.checker_command % self.host

672

except TypeError:

673

# Escape attributes for the shell

674

escaped_attrs = dict(

675

(attr,

676

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

677

errors=

678

'replace')))

679

for attr in

680

self.runtime_expansions)

681

682

try:

683

command = self.checker_command % escaped_attrs

684

except TypeError as error:

685

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

686

' %s', self.checker_command, error)

687

return True # Try again later

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688

self.current_checker_command = command

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689

try:

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690

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

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693

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

722

694

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

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695

# always replaced by /dev/null.)

724

# The exception is when not debugging but nevertheless

725

# running in the foreground; use the previously

726

# created wnull.

727

popen_args = {}

728

if (not self.server_settings["debug"]

729

and self.server_settings["foreground"]):

730

popen_args.update({"stdout": wnull,

731

"stderr": wnull })

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696

self.checker = subprocess.Popen(command,

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697

close_fds=True,

734

shell=True, cwd="/",

735

**popen_args)

736

except OSError as error:

737

logger.error("Failed to start subprocess",

738

exc_info=error)

739

return True

740

self.checker_callback_tag = (gobject.child_watch_add

741

(self.checker.pid,

742

self.checker_callback,

743

data=command))

744

# The checker may have completed before the gobject

745

# watch was added. Check for this.

746

try:

698

shell=True, cwd="/")

699

self.checker_callback_tag = (gobject.child_watch_add

700

(self.checker.pid,

701

self.checker_callback,

702

data=command))

703

# The checker may have completed before the gobject

704

# watch was added. Check for this.

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705

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

706

if pid:

707

gobject.source_remove(self.checker_callback_tag)

708

self.checker_callback(pid, status, command)

748

709

except OSError as error:

749

if error.errno == errno.ECHILD:

750

# This should never happen

751

logger.error("Child process vanished",

752

exc_info=error)

753

return True

754

raise

755

if pid:

756

gobject.source_remove(self.checker_callback_tag)

757

self.checker_callback(pid, status, command)

710

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

711

error)

758

712

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

759

713

return True

760

714

767

721

return

768

722

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

769

723

try:

770

self.checker.terminate()

724

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

771

725

#time.sleep(0.5)

772

726

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

773

# self.checker.kill()

727

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

774

728

except OSError as error:

775

729

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

776

730

raise

793

747

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

794

748

if byte_arrays and signature != "ay":

795

749

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

796

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

750

" signature %r" % signature)

797

751

def decorator(func):

798

752

func._dbus_is_property = True

799

753

func._dbus_interface = dbus_interface

807

761

return decorator

808

762

809

763

810

def dbus_interface_annotations(dbus_interface):

811

"""Decorator for marking functions returning interface annotations

812

813

Usage:

814

815

@dbus_interface_annotations("org.example.Interface")

816

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

817

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

818

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

819

"false"}

820

"""

821

def decorator(func):

822

func._dbus_is_interface = True

823

func._dbus_interface = dbus_interface

824

func._dbus_name = dbus_interface

825

return func

826

return decorator

827

828

829

def dbus_annotations(annotations):

830

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

831

Usage:

832

833

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

834

access="r")

835

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

836

"org.freedesktop.DBus.Property."

837

"EmitsChangedSignal": "false"})

838

def Property_dbus_property(self):

839

return dbus.Boolean(False)

840

"""

841

def decorator(func):

842

func._dbus_annotations = annotations

843

return func

844

return decorator

845

846

847

764

class DBusPropertyException(dbus.exceptions.DBusException):

848

765

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

849

766

"""

872

789

"""

873

790

874

791

@staticmethod

875

def _is_dbus_thing(thing):

876

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

877

878

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

879

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

880

"""

881

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

882

False)

792

def _is_dbus_property(obj):

793

return getattr(obj, "_dbus_is_property", False)

883

794

884

def _get_all_dbus_things(self, thing):

795

def _get_all_dbus_properties(self):

885

796

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

886

797

"""

887

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

888

name),

889

athing.__get__(self))

798

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

890

799

for cls in self.__class__.__mro__

891

for name, athing in

892

inspect.getmembers(cls,

893

self._is_dbus_thing(thing)))

800

for name, prop in

801

inspect.getmembers(cls, self._is_dbus_property))

894

802

895

803

def _get_dbus_property(self, interface_name, property_name):

896

804

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

898

806

"""

899

807

for cls in self.__class__.__mro__:

900

808

for name, value in (inspect.getmembers

901

(cls,

902

self._is_dbus_thing("property"))):

809

(cls, self._is_dbus_property)):

903

810

if (value._dbus_name == property_name

904

811

and value._dbus_interface == interface_name):

905

812

return value.__get__(self)

934

841

# signatures other than "ay".

935

842

if prop._dbus_signature != "ay":

936

843

raise ValueError

937

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

938

for byte in value))

844

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

845

for byte in value))

939

846

prop(value)

940

847

941

848

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

947

854

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

948

855

"""

949

856

properties = {}

950

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

857

for name, prop in self._get_all_dbus_properties():

951

858

if (interface_name

952

859

and interface_name != prop._dbus_interface):

953

860

# Interface non-empty but did not match

968

875

path_keyword='object_path',

969

876

connection_keyword='connection')

970

877

def Introspect(self, object_path, connection):

971

"""Overloading of standard D-Bus method.

972

973

Inserts property tags and interface annotation tags.

878

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

974

879

"""

975

880

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

976

881

connection)

983

888

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

984

889

return e

985

890

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

986

# Add property tags

987

891

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

988

892

for name, prop

989

in self._get_all_dbus_things("property")

893

in self._get_all_dbus_properties()

990

894

if prop._dbus_interface

991

895

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

992

896

if_tag.appendChild(tag)

993

# Add annotation tags

994

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

995

for tag in if_tag.getElementsByTagName(typ):

996

annots = dict()

997

for name, prop in (self.

998

_get_all_dbus_things(typ)):

999

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

1000

and prop._dbus_interface

1001

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

1002

annots.update(getattr

1003

(prop,

1004

"_dbus_annotations",

1005

{}))

1006

for name, value in annots.iteritems():

1007

ann_tag = document.createElement(

1008

"annotation")

1009

ann_tag.setAttribute("name", name)

1010

ann_tag.setAttribute("value", value)

1011

tag.appendChild(ann_tag)

1012

# Add interface annotation tags

1013

for annotation, value in dict(

1014

itertools.chain.from_iterable(

1015

annotations().iteritems()

1016

for name, annotations in

1017

self._get_all_dbus_things("interface")

1018

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

1019

)).iteritems():

1020

ann_tag = document.createElement("annotation")

1021

ann_tag.setAttribute("name", annotation)

1022

ann_tag.setAttribute("value", value)

1023

if_tag.appendChild(ann_tag)

1024

897

# Add the names to the return values for the

1025

898

# "org.freedesktop.DBus.Properties" methods

1026

899

if (if_tag.getAttribute("name")

1041

914

except (AttributeError, xml.dom.DOMException,

1042

915

xml.parsers.expat.ExpatError) as error:

1043

916

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

1044

exc_info=error)

917

error)

1045

918

return xmlstring

1046

919

1047

920

1048

def datetime_to_dbus(dt, variant_level=0):

921

def datetime_to_dbus (dt, variant_level=0):

1049

922

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

1050

923

if dt is None:

1051

924

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

1053

926

variant_level=variant_level)

1054

927

1055

928

1056

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1057

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

1058

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

1059

interface names according to the "alt_interface_names" mapping.

1060

Usage:

1061

1062

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

1063

"net.example.AlternateInterface"})

1064

class SampleDBusObject(dbus.service.Object):

1065

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

1066

def SampleDBusMethod():

1067

pass

1068

1069

The above "SampleDBusMethod" on "SampleDBusObject" will be

1070

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

1071

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

1072

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

1073

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

1074

1075

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

1076

(from DBusObjectWithProperties) and interfaces (from the

1077

dbus_interface_annotations decorator).

929

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

930

.__metaclass__):

931

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

932

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

1078

933

"""

1079

def wrapper(cls):

1080

for orig_interface_name, alt_interface_name in (

1081

alt_interface_names.iteritems()):

1082

attr = {}

1083

interface_names = set()

1084

# Go though all attributes of the class

1085

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

934

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

935

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

936

# methods, signals, or properties in them

937

for base in (b for b in bases

938

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

939

# Go though all attributes of the base class

940

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

1086

941

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

1087

942

# with the wrong interface name

1088

943

if (not hasattr(attribute, "_dbus_interface")

1089

944

or not attribute._dbus_interface

1090

.startswith(orig_interface_name)):

945

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

1091

946

continue

1092

947

# Create an alternate D-Bus interface name based on

1093

948

# the current name

1094

949

alt_interface = (attribute._dbus_interface

1095

.replace(orig_interface_name,

1096

alt_interface_name))

1097

interface_names.add(alt_interface)

950

.replace("se.recompile.Mandos",

951

"se.bsnet.fukt.Mandos"))

1098

952

# Is this a D-Bus signal?

1099

953

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

1100

# Extract the original non-method undecorated

1101

# function by black magic

954

# Extract the original non-method function by

955

# black magic

1102

956

nonmethod_func = (dict(

1103

957

zip(attribute.func_code.co_freevars,

1104

958

attribute.__closure__))["func"]

1115

969

nonmethod_func.func_name,

1116

970

nonmethod_func.func_defaults,

1117

971

nonmethod_func.func_closure)))

1118

# Copy annotations, if any

1119

try:

1120

new_function._dbus_annotations = (

1121

dict(attribute._dbus_annotations))

1122

except AttributeError:

1123

pass

1124

972

# Define a creator of a function to call both the

1125

# original and alternate functions, so both the

1126

# original and alternate signals gets sent when

1127

# the function is called

973

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

974

# signals gets sent when the function is called

1128

975

def fixscope(func1, func2):

1129

976

"""This function is a scope container to pass

1130

977

func1 and func2 to the "call_both" function

1137

984

return call_both

1138

985

# Create the "call_both" function and add it to

1139

986

# the class

1140

attr[attrname] = fixscope(attribute, new_function)

987

attr[attrname] = fixscope(attribute,

988

new_function)

1141

989

# Is this a D-Bus method?

1142

990

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

1143

991

# Create a new, but exactly alike, function

1154

1002

attribute.func_name,

1155

1003

attribute.func_defaults,

1156

1004

attribute.func_closure)))

1157

# Copy annotations, if any

1158

try:

1159

attr[attrname]._dbus_annotations = (

1160

dict(attribute._dbus_annotations))

1161

except AttributeError:

1162

pass

1163

1005

# Is this a D-Bus property?

1164

1006

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

1165

1007

# Create a new, but exactly alike, function

1179

1021

attribute.func_name,

1180

1022

attribute.func_defaults,

1181

1023

attribute.func_closure)))

1182

# Copy annotations, if any

1183

try:

1184

attr[attrname]._dbus_annotations = (

1185

dict(attribute._dbus_annotations))

1186

except AttributeError:

1187

pass

1188

# Is this a D-Bus interface?

1189

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

1190

# Create a new, but exactly alike, function

1191

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

1192

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

1193

# to the class.

1194

attr[attrname] = (dbus_interface_annotations

1195

(alt_interface)

1196

(types.FunctionType

1197

(attribute.func_code,

1198

attribute.func_globals,

1199

attribute.func_name,

1200

attribute.func_defaults,

1201

attribute.func_closure)))

1202

if deprecate:

1203

# Deprecate all alternate interfaces

1204

iname="_AlternateDBusNames_interface_annotation{0}"

1205

for interface_name in interface_names:

1206

@dbus_interface_annotations(interface_name)

1207

def func(self):

1208

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

1209

"true" }

1210

# Find an unused name

1211

for aname in (iname.format(i)

1212

for i in itertools.count()):

1213

if aname not in attr:

1214

attr[aname] = func

1215

break

1216

if interface_names:

1217

# Replace the class with a new subclass of it with

1218

# methods, signals, etc. as created above.

1219

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

1220

(cls,), attr)

1221

return cls

1222

return wrapper

1223

1224

1225

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

1226

"se.bsnet.fukt.Mandos"})

1024

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

1025

1026

1227

1027

class ClientDBus(Client, DBusObjectWithProperties):

1228

1028

"""A Client class using D-Bus

1229

1029

1240

1040

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

1241

1041

self.bus = bus

1242

1042

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

1043

self._approvals_pending = 0

1044

1045

self._approvals_pending = 0

1243

1046

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

1244

1047

# the D-Bus

1245

1048

client_object_name = unicode(self.name).translate(

1249

1052

("/clients/" + client_object_name))

1250

1053

DBusObjectWithProperties.__init__(self, self.bus,

1251

1054

self.dbus_object_path)

1252

1055

1253

1056

def notifychangeproperty(transform_func,

1254

1057

dbus_name, type_func=lambda x: x,

1255

1058

variant_level=1):

1278

1081

1279

1082

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

1280

1083

1084

1281

1085

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1282

1086

approvals_pending = notifychangeproperty(dbus.Boolean,

1283

1087

"ApprovalPending",

1290

1094

checker is not None)

1291

1095

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1292

1096

"LastCheckedOK")

1293

last_checker_status = notifychangeproperty(dbus.Int16,

1294

"LastCheckerStatus")

1295

1097

last_approval_request = notifychangeproperty(

1296

1098

datetime_to_dbus, "LastApprovalRequest")

1297

1099

approved_by_default = notifychangeproperty(dbus.Boolean,

1365

1167

return False

1366

1168

1367

1169

def approve(self, value=True):

1170

self.send_changedstate()

1368

1171

self.approved = value

1369

1172

gobject.timeout_add(timedelta_to_milliseconds

1370

1173

(self.approval_duration),

1371

1174

self._reset_approved)

1372

self.send_changedstate()

1175

1373

1176

1374

1177

## D-Bus methods, signals & properties

1375

1178

_interface = "se.recompile.Mandos.Client"

1376

1179

1377

## Interfaces

1378

1379

@dbus_interface_annotations(_interface)

1380

def _foo(self):

1381

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

1382

"false"}

1383

1384

1180

## Signals

1385

1181

1386

1182

# CheckerCompleted - signal

1422

1218

"D-Bus signal"

1423

1219

return self.need_approval()

1424

1220

1221

# NeRwequest - signal

1222

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

1223

def NewRequest(self, ip):

1224

"""D-Bus signal

1225

Is sent after a client request a password.

1226

"""

1227

pass

1228

1425

1229

## Methods

1426

1230

1427

1231

# Approve - method

1537

1341

return

1538

1342

return datetime_to_dbus(self.last_checked_ok)

1539

1343

1540

# LastCheckerStatus - property

1541

@dbus_service_property(_interface, signature="n",

1542

access="read")

1543

def LastCheckerStatus_dbus_property(self):

1544

return dbus.Int16(self.last_checker_status)

1545

1546

1344

# Expires - property

1547

1345

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

1548

1346

def Expires_dbus_property(self):

1559

1357

def Timeout_dbus_property(self, value=None):

1560

1358

if value is None: # get

1561

1359

return dbus.UInt64(self.timeout_milliseconds())

1562

old_timeout = self.timeout

1563

1360

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

1564

# Reschedule disabling

1565

if self.enabled:

1566

now = datetime.datetime.utcnow()

1567

self.expires += self.timeout - old_timeout

1568

if self.expires <= now:

1569

# The timeout has passed

1570

self.disable()

1571

else:

1572

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

1573

is None):

1574

return

1575

gobject.source_remove(self.disable_initiator_tag)

1576

self.disable_initiator_tag = (

1577

gobject.timeout_add(

1578

timedelta_to_milliseconds(self.expires - now),

1579

self.disable))

1361

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

1362

return

1363

# Reschedule timeout

1364

gobject.source_remove(self.disable_initiator_tag)

1365

self.disable_initiator_tag = None

1366

self.expires = None

1367

time_to_die = timedelta_to_milliseconds((self

1368

.last_checked_ok

1369

+ self.timeout)

1370

- datetime.datetime

1371

.utcnow())

1372

if time_to_die <= 0:

1373

# The timeout has passed

1374

self.disable()

1375

else:

1376

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

1377

+ datetime.timedelta(milliseconds =

1378

time_to_die))

1379

self.disable_initiator_tag = (gobject.timeout_add

1380

(time_to_die, self.disable))

1580

1381

1581

1382

# ExtendedTimeout - property

1582

1383

@dbus_service_property(_interface, signature="t",

1661

1462

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

1662

1463

1663

1464

1465

class ClientDBusTransitional(ClientDBus):

1466

__metaclass__ = AlternateDBusNamesMetaclass

1467

1468

1664

1469

class ClientHandler(socketserver.BaseRequestHandler, object):

1665

1470

"""A class to handle client connections.

1666

1471

1734

1539

except KeyError:

1735

1540

return

1736

1541

1542

if self.server.use_dbus:

1543

# Emit D-Bus signal

1544

client.NewRequest(str(self.client_address))

1545

1737

1546

if client.approval_delay:

1738

1547

delay = client.approval_delay

1739

1548

client.approvals_pending += 1

1770

1579

#wait until timeout or approved

1771

1580

time = datetime.datetime.now()

1772

1581

client.changedstate.acquire()

1773

client.changedstate.wait(

1774

float(timedelta_to_milliseconds(delay)

1775

/ 1000))

1582

(client.changedstate.wait

1583

(float(client.timedelta_to_milliseconds(delay)

1584

/ 1000)))

1776

1585

client.changedstate.release()

1777

1586

time2 = datetime.datetime.now()

1778

1587

if (time2 - time) >= delay:

1794

1603

try:

1795

1604

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

1796

1605

except gnutls.errors.GNUTLSError as error:

1797

logger.warning("gnutls send failed",

1798

exc_info=error)

1606

logger.warning("gnutls send failed")

1799

1607

return

1800

1608

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

1801

1609

sent, len(client.secret)

1804

1612

1805

1613

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

1806

1614

# bump the timeout using extended_timeout

1807

client.bump_timeout(client.extended_timeout)

1615

client.checked_ok(client.extended_timeout)

1808

1616

if self.server.use_dbus:

1809

1617

# Emit D-Bus signal

1810

1618

client.GotSecret()

1815

1623

try:

1816

1624

session.bye()

1817

1625

except gnutls.errors.GNUTLSError as error:

1818

logger.warning("GnuTLS bye failed",

1819

exc_info=error)

1626

logger.warning("GnuTLS bye failed")

1820

1627

1821

1628

@staticmethod

1822

1629

def peer_certificate(session):

1894

1701

def process_request(self, request, address):

1895

1702

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

1896

1703

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

1897

args = (request, address))

1704

args = (request,

1705

address))

1898

1706

proc.start()

1899

1707

return proc

1900

1708

1928

1736

use_ipv6: Boolean; to use IPv6 or not

1929

1737

"""

1930

1738

def __init__(self, server_address, RequestHandlerClass,

1931

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

1932

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

1933

creating a new one with socket.socket().

1934

"""

1739

interface=None, use_ipv6=True):

1935

1740

self.interface = interface

1936

1741

if use_ipv6:

1937

1742

self.address_family = socket.AF_INET6

1938

if socketfd is not None:

1939

# Save the file descriptor

1940

self.socketfd = socketfd

1941

# Save the original socket.socket() function

1942

self.socket_socket = socket.socket

1943

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

1944

#

1945

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

1946

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

1947

# patching socket.socket.)

1948

#

1949

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

1950

@functools.wraps(socket.socket)

1951

def socket_wrapper(*args, **kwargs):

1952

# Restore original function so subsequent calls are

1953

# not affected.

1954

socket.socket = self.socket_socket

1955

del self.socket_socket

1956

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

1957

# saved file descriptor.

1958

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

1959

# Replace socket.socket() function with wrapper

1960

socket.socket = socket_wrapper

1961

# The socketserver.TCPServer.__init__ will call

1962

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

1963

# socket_wrapper(), if socketfd was set.

1964

1743

socketserver.TCPServer.__init__(self, server_address,

1965

1744

RequestHandlerClass)

1966

1967

1745

def server_bind(self):

1968

1746

"""This overrides the normal server_bind() function

1969

1747

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

1977

1755

try:

1978

1756

self.socket.setsockopt(socket.SOL_SOCKET,

1979

1757

SO_BINDTODEVICE,

1980

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

1758

str(self.interface

1759

+ '\0'))

1981

1760

except socket.error as error:

1982

if error.errno == errno.EPERM:

1983

logger.error("No permission to bind to"

1984

" interface %s", self.interface)

1985

elif error.errno == errno.ENOPROTOOPT:

1761

if error[0] == errno.EPERM:

1762

logger.error("No permission to"

1763

" bind to interface %s",

1764

self.interface)

1765

elif error[0] == errno.ENOPROTOOPT:

1986

1766

logger.error("SO_BINDTODEVICE not available;"

1987

1767

" cannot bind to interface %s",

1988

1768

self.interface)

1989

elif error.errno == errno.ENODEV:

1990

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

1991

" cannot bind", self.interface)

1992

1769

else:

1993

1770

raise

1994

1771

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

1997

1774

if self.address_family == socket.AF_INET6:

1998

1775

any_address = "::" # in6addr_any

1999

1776

else:

2000

any_address = "0.0.0.0" # INADDR_ANY

1777

any_address = socket.INADDR_ANY

2001

1778

self.server_address = (any_address,

2002

1779

self.server_address[1])

2003

1780

elif not self.server_address[1]:

2024

1801

"""

2025

1802

def __init__(self, server_address, RequestHandlerClass,

2026

1803

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

2027

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

1804

gnutls_priority=None, use_dbus=True):

2028

1805

self.enabled = False

2029

1806

self.clients = clients

2030

1807

if self.clients is None:

2034

1811

IPv6_TCPServer.__init__(self, server_address,

2035

1812

RequestHandlerClass,

2036

1813

interface = interface,

2037

use_ipv6 = use_ipv6,

2038

socketfd = socketfd)

1814

use_ipv6 = use_ipv6)

2039

1815

def server_activate(self):

2040

1816

if self.enabled:

2041

1817

return socketserver.TCPServer.server_activate(self)

2054

1830

2055

1831

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

2056

1832

proc = None, client_object=None):

1833

condition_names = {

1834

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

1835

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

1836

# blocking).

1837

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

1838

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

1839

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

1840

# broken, usually for pipes and

1841

# sockets).

1842

}

1843

conditions_string = ' | '.join(name

1844

for cond, name in

1845

condition_names.iteritems()

1846

if cond & condition)

2057

1847

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

2058

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

1848

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

2059

1849

# Wait for other process to exit

2060

1850

proc.join()

2061

1851

return False

2119

1909

return True

2120

1910

2121

1911

2122

def rfc3339_duration_to_delta(duration):

2123

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

2124

2125

>>> rfc3339_duration_to_delta("P7D")

2126

datetime.timedelta(7)

2127

>>> rfc3339_duration_to_delta("PT60S")

2128

datetime.timedelta(0, 60)

2129

>>> rfc3339_duration_to_delta("PT60M")

2130

datetime.timedelta(0, 3600)

2131

>>> rfc3339_duration_to_delta("PT24H")

2132

datetime.timedelta(1)

2133

>>> rfc3339_duration_to_delta("P1W")

2134

datetime.timedelta(7)

2135

>>> rfc3339_duration_to_delta("PT5M30S")

2136

datetime.timedelta(0, 330)

2137

>>> rfc3339_duration_to_delta("P1DT3M20S")

2138

datetime.timedelta(1, 200)

2139

"""

2140

2141

# Parsing an RFC 3339 duration with regular expressions is not

2142

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

2143

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

2144

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

2145

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

2146

# avoid excessive use of external libraries.

2147

2148

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

2149

Token = collections.namedtuple("Token",

2150

("regexp", # To match token; if

2151

# "value" is not None,

2152

# must have a "group"

2153

# containing digits

2154

"value", # datetime.timedelta or

2155

# None

2156

"followers")) # Tokens valid after

2157

# this token

2158

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

2159

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

2160

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

2161

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

2162

datetime.timedelta(seconds=1),

2163

frozenset((token_end,)))

2164

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

2165

datetime.timedelta(minutes=1),

2166

frozenset((token_second, token_end)))

2167

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

2168

datetime.timedelta(hours=1),

2169

frozenset((token_minute, token_end)))

2170

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

2171

None,

2172

frozenset((token_hour, token_minute,

2173

token_second)))

2174

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

2175

datetime.timedelta(days=1),

2176

frozenset((token_time, token_end)))

2177

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

2178

datetime.timedelta(weeks=4),

2179

frozenset((token_day, token_end)))

2180

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

2181

datetime.timedelta(weeks=52),

2182

frozenset((token_month, token_end)))

2183

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

2184

datetime.timedelta(weeks=1),

2185

frozenset((token_end,)))

2186

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

2187

frozenset((token_year, token_month,

2188

token_day, token_time,

2189

token_week))),

2190

# Define starting values

2191

value = datetime.timedelta() # Value so far

2192

found_token = None

2193

followers = frozenset(token_duration,) # Following valid tokens

2194

s = duration # String left to parse

2195

# Loop until end token is found

2196

while found_token is not token_end:

2197

# Search for any currently valid tokens

2198

for token in followers:

2199

match = token.regexp.match(s)

2200

if match is not None:

2201

# Token found

2202

if token.value is not None:

2203

# Value found, parse digits

2204

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

2205

# Add to value so far

2206

value += factor * token.value

2207

# Strip token from string

2208

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

2209

# Go to found token

2210

found_token = token

2211

# Set valid next tokens

2212

followers = found_token.followers

2213

break

2214

else:

2215

# No currently valid tokens were found

2216

raise ValueError("Invalid RFC 3339 duration")

2217

# End token found

2218

return value

2219

2220

2221

1912

def string_to_delta(interval):

2222

1913

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

2223

1914

2234

1925

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

2235

1926

datetime.timedelta(0, 330)

2236

1927

"""

2237

2238

try:

2239

return rfc3339_duration_to_delta(interval)

2240

except ValueError:

2241

pass

2242

2243

1928

timevalue = datetime.timedelta(0)

2244

1929

for s in interval.split():

2245

1930

try:

2256

1941

elif suffix == "w":

2257

1942

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

2258

1943

else:

2259

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

2260

.format(suffix))

1944

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

2261

1945

except (ValueError, IndexError) as e:

2262

1946

raise ValueError(*(e.args))

2263

1947

timevalue += delta

2277

1961

sys.exit()

2278

1962

if not noclose:

2279

1963

# Close all standard open file descriptors

2280

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

1964

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

2281

1965

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

2282

1966

raise OSError(errno.ENODEV,

2283

"{0} not a character device"

2284

.format(os.devnull))

1967

"%s not a character device"

1968

% os.path.devnull)

2285

1969

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

2286

1970

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

2287

1971

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

2296

1980

2297

1981

parser = argparse.ArgumentParser()

2298

1982

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

2299

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

1983

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

2300

1984

help="show version number and exit")

2301

1985

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

2302

1986

help="Bind to interface IF")

2308

1992

help="Run self-test")

2309

1993

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

2310

1994

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

2311

" to terminal", default=None)

1995

" to terminal")

2312

1996

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

2313

1997

help="Debug level for stdout output")

2314

1998

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

2321

2005

" files")

2322

2006

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

2323

2007

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

2324

" system bus interface", default=None)

2008

" system bus interface")

2325

2009

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

2326

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

2327

default=None)

2010

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

2328

2011

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

2329

2012

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

2330

" state", default=None)

2331

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

2332

help="Specify a file descriptor to a network"

2333

" socket to use instead of creating one")

2013

" state")

2334

2014

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

2335

2015

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

2336

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

2337

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

2338

2016

2339

2017

options = parser.parse_args()

2340

2018

2349

2027

"port": "",

2350

2028

"debug": "False",

2351

2029

"priority":

2352

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

2030

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

2353

2031

"servicename": "Mandos",

2354

2032

"use_dbus": "True",

2355

2033

"use_ipv6": "True",

2356

2034

"debuglevel": "",

2357

2035

"restore": "True",

2358

"socket": "",

2359

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

2360

"foreground": "False",

2036

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

2361

2037

}

2362

2038

2363

2039

# Parse config file for server-global settings

2368

2044

# Convert the SafeConfigParser object to a dict

2369

2045

server_settings = server_config.defaults()

2370

2046

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

2371

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

2047

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

2372

2048

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

2373

2049

option)

2374

2050

if server_settings["port"]:

2375

2051

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

2376

2052

"port")

2377

if server_settings["socket"]:

2378

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

2379

"socket")

2380

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

2381

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

2382

# happen with a supplied network socket.

2383

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

2384

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

2385

["socket"])

2386

2053

del server_config

2387

2054

2388

2055

# Override the settings from the config file with command line

2390

2057

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

2391

2058

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

2392

2059

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

2393

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

2060

"statedir"):

2394

2061

value = getattr(options, option)

2395

2062

if value is not None:

2396

2063

server_settings[option] = value

2399

2066

for option in server_settings.keys():

2400

2067

if type(server_settings[option]) is str:

2401

2068

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

2402

# Force all boolean options to be boolean

2403

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

2404

"foreground"):

2405

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

2406

# Debug implies foreground

2407

if server_settings["debug"]:

2408

server_settings["foreground"] = True

2409

2069

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

2410

2070

2411

2071

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

2417

2077

use_ipv6 = server_settings["use_ipv6"]

2418

2078

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

2419

2079

stored_state_file)

2420

foreground = server_settings["foreground"]

2421

2080

2422

2081

if debug:

2423

2082

initlogger(debug, logging.DEBUG)

2430

2089

2431

2090

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

2432

2091

syslogger.setFormatter(logging.Formatter

2433

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

2434

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

2435

.format(server_settings

2436

["servicename"])))

2092

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

2093

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

2094

% server_settings["servicename"]))

2437

2095

2438

2096

# Parse config file with clients

2439

client_config = configparser.SafeConfigParser(Client

2440

.client_defaults)

2097

client_config = configparser.SafeConfigParser(Client.client_defaults)

2441

2098

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

2442

2099

"clients.conf"))

2443

2100

2452

2109

use_ipv6=use_ipv6,

2453

2110

gnutls_priority=

2454

2111

server_settings["priority"],

2455

use_dbus=use_dbus,

2456

socketfd=(server_settings["socket"]

2457

or None))

2458

if not foreground:

2459

pidfilename = "/run/mandos.pid"

2460

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

2461

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

2462

pidfile = None

2112

use_dbus=use_dbus)

2113

if not debug:

2114

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

2463

2115

try:

2464

2116

pidfile = open(pidfilename, "w")

2465

except IOError as e:

2466

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

2467

exc_info=e)

2117

except IOError:

2118

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

2468

2119

2469

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

2120

try:

2121

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

2122

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

2123

except KeyError:

2470

2124

try:

2471

uid = pwd.getpwnam(name).pw_uid

2472

gid = pwd.getpwnam(name).pw_gid

2473

break

2125

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

2126

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

2474

2127

except KeyError:

2475

continue

2476

else:

2477

uid = 65534

2478

gid = 65534

2128

try:

2129

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

2130

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

2131

except KeyError:

2132

uid = 65534

2133

gid = 65534

2479

2134

try:

2480

2135

os.setgid(gid)

2481

2136

os.setuid(uid)

2482

2137

except OSError as error:

2483

if error.errno != errno.EPERM:

2138

if error[0] != errno.EPERM:

2484

2139

raise error

2485

2140

2486

2141

if debug:

2498

2153

.gnutls_global_set_log_function(debug_gnutls))

2499

2154

2500

2155

# Redirect stdin so all checkers get /dev/null

2501

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

2156

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

2502

2157

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

2503

2158

if null > 2:

2504

2159

os.close(null)

2505

2160

2506

2161

# Need to fork before connecting to D-Bus

2507

if not foreground:

2162

if not debug:

2508

2163

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

2509

2164

daemon()

2510

2165

2511

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

2512

# need to inform gobject that threads will be used.

2513

2166

gobject.threads_init()

2514

2167

2515

2168

global main_loop

2516

2169

# From the Avahi example code

2517

DBusGMainLoop(set_as_default=True)

2170

DBusGMainLoop(set_as_default=True )

2518

2171

main_loop = gobject.MainLoop()

2519

2172

bus = dbus.SystemBus()

2520

2173

# End of Avahi example code

2526

2179

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

2527

2180

do_not_queue=True))

2528

2181

except dbus.exceptions.NameExistsException as e:

2529

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

2182

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

2530

2183

use_dbus = False

2531

2184

server_settings["use_dbus"] = False

2532

2185

tcp_server.use_dbus = False

2544

2197

2545

2198

client_class = Client

2546

2199

if use_dbus:

2547

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

2200

client_class = functools.partial(ClientDBusTransitional,

2201

bus = bus)

2548

2202

2549

2203

client_settings = Client.config_parser(client_config)

2550

2204

old_client_settings = {}

2551

2205

clients_data = {}

2552

2206

2553

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

2554

global wnull

2555

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

2556

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

2557

# mode

2558

if debug or not foreground:

2559

wnull.close()

2560

2561

2207

# Get client data and settings from last running state.

2562

2208

if server_settings["restore"]:

2563

2209

try:

2566

2212

(stored_state))

2567

2213

os.remove(stored_state_path)

2568

2214

except IOError as e:

2569

if e.errno == errno.ENOENT:

2570

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

2571

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

2572

else:

2573

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

2574

exc_info=e)

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2575

2218

raise

2576

2219

except EOFError as e:

2577

2220

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

2578

"EOFError:", exc_info=e)

2221

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

2579

2222

2580

2223

with PGPEngine() as pgp:

2581

2224

for client_name, client in clients_data.iteritems():

2582

# Skip removed clients

2583

if client_name not in client_settings:

2584

continue

2585

2586

2225

# Decide which value to use after restoring saved state.

2587

2226

# We have three different values: Old config file,

2588

2227

# new config file, and saved state.

2602

2241

2603

2242

# Clients who has passed its expire date can still be

2604

2243

# enabled if its last checker was successful. Clients

2605

# whose checker succeeded before we stored its state is

2606

# assumed to have successfully run all checkers during

2607

# downtime.

2244

# whose checker failed before we stored its state is

2245

# assumed to have failed all checkers during downtime.

2608

2246

if client["enabled"]:

2609

2247

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

2610

2248

if not client["last_checked_ok"]:

2611

2249

logger.warning(

2612

2250

"disabling client {0} - Client never "

2613

"performed a successful checker"

2614

.format(client_name))

2251

"performed a successfull checker"

2252

.format(client["name"]))

2615

2253

client["enabled"] = False

2616

2254

elif client["last_checker_status"] != 0:

2617

2255

logger.warning(

2618

2256

"disabling client {0} - Client "

2619

2257

"last checker failed with error code {1}"

2620

.format(client_name,

2258

.format(client["name"],

2621

2259

client["last_checker_status"]))

2622

2260

client["enabled"] = False

2623

2261

else:

2624

2262

client["expires"] = (datetime.datetime

2625

2263

.utcnow()

2626

2264

+ client["timeout"])

2627

logger.debug("Last checker succeeded,"

2628

" keeping {0} enabled"

2629

.format(client_name))

2265

2630

2266

try:

2631

2267

client["secret"] = (

2632

2268

pgp.decrypt(client["encrypted_secret"],

2638

2274

.format(client_name))

2639

2275

client["secret"] = (

2640

2276

client_settings[client_name]["secret"])

2277

2641

2278

2642

2279

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

2643

for client_name in (set(old_client_settings)

2644

- set(client_settings)):

2280

for client_name in set(old_client_settings) - set(client_settings):

2645

2281

del clients_data[client_name]

2646

for client_name in (set(client_settings)

2647

- set(old_client_settings)):

2282

for client_name in set(client_settings) - set(old_client_settings):

2648

2283

clients_data[client_name] = client_settings[client_name]

2649

2650

# Create all client objects

2284

2285

# Create clients all clients

2651

2286

for client_name, client in clients_data.iteritems():

2652

2287

tcp_server.clients[client_name] = client_class(

2653

name = client_name, settings = client,

2654

server_settings = server_settings)

2288

name = client_name, settings = client)

2655

2289

2656

2290

if not tcp_server.clients:

2657

2291

logger.warning("No clients defined")

2658

2659

if not foreground:

2660

if pidfile is not None:

2661

try:

2662

with pidfile:

2663

pid = os.getpid()

2664

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

2665

except IOError:

2666

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

2667

pidfilename, pid)

2668

del pidfile

2292

2293

if not debug:

2294

try:

2295

with pidfile:

2296

pid = os.getpid()

2297

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

2298

del pidfile

2299

except IOError:

2300

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

2301

pidfilename, pid)

2302

except NameError:

2303

# "pidfile" was never created

2304

pass

2669

2305

del pidfilename

2306

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

2670

2307

2671

2308

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

2672

2309

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

2673

2310

2674

2311

if use_dbus:

2675

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

2676

"se.bsnet.fukt.Mandos"})

2677

class MandosDBusService(DBusObjectWithProperties):

2312

class MandosDBusService(dbus.service.Object):

2678

2313

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

2679

2314

def __init__(self):

2680

2315

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

2681

2316

_interface = "se.recompile.Mandos"

2682

2317

2683

@dbus_interface_annotations(_interface)

2684

def _foo(self):

2685

return { "org.freedesktop.DBus.Property"

2686

".EmitsChangedSignal":

2687

"false"}

2688

2689

2318

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

2690

2319

def ClientAdded(self, objpath):

2691

2320

"D-Bus signal"

2733

2362

2734

2363

del _interface

2735

2364

2736

mandos_dbus_service = MandosDBusService()

2365

class MandosDBusServiceTransitional(MandosDBusService):

2366

__metaclass__ = AlternateDBusNamesMetaclass

2367

mandos_dbus_service = MandosDBusServiceTransitional()

2737

2368

2738

2369

def cleanup():

2739

2370

"Cleanup function; run on exit"

2740

2371

service.cleanup()

2741

2372

2742

2373

multiprocessing.active_children()

2743

wnull.close()

2744

2374

if not (tcp_server.clients or client_settings):

2745

2375

return

2746

2376

2758

2388

# A list of attributes that can not be pickled

2759

2389

# + secret.

2760

2390

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

2761

"checker", "server_settings"))

2391

"checker"))

2762

2392

for name, typ in (inspect.getmembers

2763

2393

(dbus.service.Object)):

2764

2394

exclude.add(name)

2773

2403

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

2774

2404

2775

2405

try:

2776

with (tempfile.NamedTemporaryFile

2777

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

2778

dir=os.path.dirname(stored_state_path),

2779

delete=False)) as stored_state:

2406

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

2407

prefix="clients-",

2408

dir=os.path.dirname

2409

(stored_state_path))

2410

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

2780

2411

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

2781

tempname=stored_state.name

2782

2412

os.rename(tempname, stored_state_path)

2783

2413

except (IOError, OSError) as e:

2414

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

2415

.format(e))

2784

2416

if not debug:

2785

2417

try:

2786

2418

os.remove(tempname)

2787

2419

except NameError:

2788

2420

pass

2789

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

2790

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

2791

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

2792

else:

2793

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

2794

exc_info=e)

2421

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

2422

errno.EEXIST)):

2795

2423

raise e

2796

2424

2797

2425

# Delete all clients, and settings from config

2825

2453

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

2826

2454

if use_ipv6:

2827

2455

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

2828

" flowinfo %d, scope_id %d",

2829

*tcp_server.socket.getsockname())

2456

" flowinfo %d, scope_id %d"

2457

% tcp_server.socket.getsockname())

2830

2458

else: # IPv4

2831

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

2832

*tcp_server.socket.getsockname())

2459

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

2460

% tcp_server.socket.getsockname())

2833

2461

2834

2462

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

2835

2463

2838

2466

try:

2839

2467

service.activate()

2840

2468

except dbus.exceptions.DBusException as error:

2841

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

2469

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

2842

2470

cleanup()

2843

2471

sys.exit(1)

2844

2472

# End of Avahi example code

2851

2479

logger.debug("Starting main loop")

2852

2480

main_loop.run()

2853

2481

except AvahiError as error:

2854

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

2482

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

2855

2483

cleanup()

2856

2484

sys.exit(1)

2857

2485

except KeyboardInterrupt: