/mandos/trunk : revision 544

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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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'--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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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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"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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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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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()

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if not quiet:

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

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

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

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

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

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

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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

611

if not quiet:

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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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600

# and every interval from then on.

622

if self.checker_initiator_tag is not None:

623

gobject.source_remove(self.checker_initiator_tag)

624

601

self.checker_initiator_tag = (gobject.timeout_add

625

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(self.interval_milliseconds(),

626

603

self.start_checker))

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

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

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605

self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

632

607

self.disable))

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

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627

vars(self))

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628

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def checked_ok(self):

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"""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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def bump_timeout(self, timeout=None):

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

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def checked_ok(self, timeout=None):

630

"""Bump up the timeout for this client.

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632

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

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alive and well.

634

"""

662

635

if timeout is None:

663

636

timeout = self.timeout

637

self.last_checked_ok = datetime.datetime.utcnow()

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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 = None

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640

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

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641

self.disable_initiator_tag = (gobject.timeout_add

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642

(timedelta_to_milliseconds

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652

If a checker already exists, leave it running and do

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653

nothing."""

681

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# 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

655

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

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

657

# client would inevitably timeout, since no checker would get

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

686

659

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

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660

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

688

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# should be.

690

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

691

664

try:

692

665

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

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

666

except (AttributeError, OSError) as error:

667

if (isinstance(error, OSError)

668

and error.errno != errno.ECHILD):

669

raise error

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670

else:

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671

if pid:

700

672

logger.warning("Checker was a zombie")

703

675

self.current_checker_command)

704

676

# Start a new checker if needed

705

677

if self.checker is None:

706

# Escape attributes for the shell

707

escaped_attrs = dict(

708

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

709

for attr in

710

self.runtime_expansions)

711

678

try:

712

command = self.checker_command % escaped_attrs

713

except TypeError as error:

714

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

715

self.checker_command, exc_info=error)

716

return True # Try again later

679

# In case checker_command has exactly one % operator

680

command = self.checker_command % self.host

681

except TypeError:

682

# Escape attributes for the shell

683

escaped_attrs = dict(

684

(attr,

685

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

686

errors=

687

'replace')))

688

for attr in

689

self.runtime_expansions)

690

691

try:

692

command = self.checker_command % escaped_attrs

693

except TypeError as error:

694

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

695

' %s', self.checker_command, error)

696

return True # Try again later

717

697

self.current_checker_command = command

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698

try:

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699

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

722

702

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

723

703

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

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704

# always replaced by /dev/null.)

725

# The exception is when not debugging but nevertheless

726

# running in the foreground; use the previously

727

# created wnull.

728

popen_args = {}

729

if (not self.server_settings["debug"]

730

and self.server_settings["foreground"]):

731

popen_args.update({"stdout": wnull,

732

"stderr": wnull })

733

705

self.checker = subprocess.Popen(command,

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706

close_fds=True,

735

shell=True, cwd="/",

736

**popen_args)

737

except OSError as error:

738

logger.error("Failed to start subprocess",

739

exc_info=error)

740

return True

741

self.checker_callback_tag = (gobject.child_watch_add

742

(self.checker.pid,

743

self.checker_callback,

744

data=command))

745

# The checker may have completed before the gobject

746

# watch was added. Check for this.

747

try:

707

shell=True, cwd="/")

708

self.checker_callback_tag = (gobject.child_watch_add

709

(self.checker.pid,

710

self.checker_callback,

711

data=command))

712

# The checker may have completed before the gobject

713

# watch was added. Check for this.

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714

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

715

if pid:

716

gobject.source_remove(self.checker_callback_tag)

717

self.checker_callback(pid, status, command)

749

718

except OSError as error:

750

if error.errno == errno.ECHILD:

751

# This should never happen

752

logger.error("Child process vanished",

753

exc_info=error)

754

return True

755

raise

756

if pid:

757

gobject.source_remove(self.checker_callback_tag)

758

self.checker_callback(pid, status, command)

719

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

720

error)

759

721

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

760

722

return True

761

723

768

730

return

769

731

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

770

732

try:

771

self.checker.terminate()

733

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

772

734

#time.sleep(0.5)

773

735

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

774

# self.checker.kill()

736

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

775

737

except OSError as error:

776

738

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

777

739

raise

794

756

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

795

757

if byte_arrays and signature != "ay":

796

758

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

797

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

759

" signature %r" % signature)

798

760

def decorator(func):

799

761

func._dbus_is_property = True

800

762

func._dbus_interface = dbus_interface

808

770

return decorator

809

771

810

772

811

def dbus_interface_annotations(dbus_interface):

812

"""Decorator for marking functions returning interface annotations

813

814

Usage:

815

816

@dbus_interface_annotations("org.example.Interface")

817

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

818

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

819

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

820

"false"}

821

"""

822

def decorator(func):

823

func._dbus_is_interface = True

824

func._dbus_interface = dbus_interface

825

func._dbus_name = dbus_interface

826

return func

827

return decorator

828

829

830

def dbus_annotations(annotations):

831

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

832

Usage:

833

834

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

835

access="r")

836

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

837

"org.freedesktop.DBus.Property."

838

"EmitsChangedSignal": "false"})

839

def Property_dbus_property(self):

840

return dbus.Boolean(False)

841

"""

842

def decorator(func):

843

func._dbus_annotations = annotations

844

return func

845

return decorator

846

847

848

773

class DBusPropertyException(dbus.exceptions.DBusException):

849

774

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

850

775

"""

873

798

"""

874

799

875

800

@staticmethod

876

def _is_dbus_thing(thing):

877

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

878

879

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

880

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

881

"""

882

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

883

False)

801

def _is_dbus_property(obj):

802

return getattr(obj, "_dbus_is_property", False)

884

803

885

def _get_all_dbus_things(self, thing):

804

def _get_all_dbus_properties(self):

886

805

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

887

806

"""

888

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

889

name),

890

athing.__get__(self))

807

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

891

808

for cls in self.__class__.__mro__

892

for name, athing in

893

inspect.getmembers(cls,

894

self._is_dbus_thing(thing)))

809

for name, prop in

810

inspect.getmembers(cls, self._is_dbus_property))

895

811

896

812

def _get_dbus_property(self, interface_name, property_name):

897

813

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

899

815

"""

900

816

for cls in self.__class__.__mro__:

901

817

for name, value in (inspect.getmembers

902

(cls,

903

self._is_dbus_thing("property"))):

818

(cls, self._is_dbus_property)):

904

819

if (value._dbus_name == property_name

905

820

and value._dbus_interface == interface_name):

906

821

return value.__get__(self)

935

850

# signatures other than "ay".

936

851

if prop._dbus_signature != "ay":

937

852

raise ValueError

938

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

939

for byte in value))

853

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

854

for byte in value))

940

855

prop(value)

941

856

942

857

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

948

863

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

949

864

"""

950

865

properties = {}

951

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

866

for name, prop in self._get_all_dbus_properties():

952

867

if (interface_name

953

868

and interface_name != prop._dbus_interface):

954

869

# Interface non-empty but did not match

969

884

path_keyword='object_path',

970

885

connection_keyword='connection')

971

886

def Introspect(self, object_path, connection):

972

"""Overloading of standard D-Bus method.

973

974

Inserts property tags and interface annotation tags.

887

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

975

888

"""

976

889

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

977

890

connection)

984

897

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

985

898

return e

986

899

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

987

# Add property tags

988

900

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

989

901

for name, prop

990

in self._get_all_dbus_things("property")

902

in self._get_all_dbus_properties()

991

903

if prop._dbus_interface

992

904

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

993

905

if_tag.appendChild(tag)

994

# Add annotation tags

995

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

996

for tag in if_tag.getElementsByTagName(typ):

997

annots = dict()

998

for name, prop in (self.

999

_get_all_dbus_things(typ)):

1000

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

1001

and prop._dbus_interface

1002

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

1003

annots.update(getattr

1004

(prop,

1005

"_dbus_annotations",

1006

{}))

1007

for name, value in annots.iteritems():

1008

ann_tag = document.createElement(

1009

"annotation")

1010

ann_tag.setAttribute("name", name)

1011

ann_tag.setAttribute("value", value)

1012

tag.appendChild(ann_tag)

1013

# Add interface annotation tags

1014

for annotation, value in dict(

1015

itertools.chain.from_iterable(

1016

annotations().iteritems()

1017

for name, annotations in

1018

self._get_all_dbus_things("interface")

1019

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

1020

)).iteritems():

1021

ann_tag = document.createElement("annotation")

1022

ann_tag.setAttribute("name", annotation)

1023

ann_tag.setAttribute("value", value)

1024

if_tag.appendChild(ann_tag)

1025

906

# Add the names to the return values for the

1026

907

# "org.freedesktop.DBus.Properties" methods

1027

908

if (if_tag.getAttribute("name")

1042

923

except (AttributeError, xml.dom.DOMException,

1043

924

xml.parsers.expat.ExpatError) as error:

1044

925

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

1045

exc_info=error)

926

error)

1046

927

return xmlstring

1047

928

1048

929

1049

def datetime_to_dbus(dt, variant_level=0):

930

def datetime_to_dbus (dt, variant_level=0):

1050

931

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

1051

932

if dt is None:

1052

933

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

1054

935

variant_level=variant_level)

1055

936

1056

937

1057

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1058

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

1059

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

1060

interface names according to the "alt_interface_names" mapping.

1061

Usage:

1062

1063

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

1064

"net.example.AlternateInterface"})

1065

class SampleDBusObject(dbus.service.Object):

1066

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

1067

def SampleDBusMethod():

1068

pass

1069

1070

The above "SampleDBusMethod" on "SampleDBusObject" will be

1071

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

1072

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

1073

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

1074

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

1075

1076

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

1077

(from DBusObjectWithProperties) and interfaces (from the

1078

dbus_interface_annotations decorator).

938

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

939

.__metaclass__):

940

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

941

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

1079

942

"""

1080

def wrapper(cls):

1081

for orig_interface_name, alt_interface_name in (

1082

alt_interface_names.iteritems()):

1083

attr = {}

1084

interface_names = set()

1085

# Go though all attributes of the class

1086

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

943

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

944

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

945

# methods, signals, or properties in them

946

for base in (b for b in bases

947

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

948

# Go though all attributes of the base class

949

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

1087

950

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

1088

951

# with the wrong interface name

1089

952

if (not hasattr(attribute, "_dbus_interface")

1090

953

or not attribute._dbus_interface

1091

.startswith(orig_interface_name)):

954

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

1092

955

continue

1093

956

# Create an alternate D-Bus interface name based on

1094

957

# the current name

1095

958

alt_interface = (attribute._dbus_interface

1096

.replace(orig_interface_name,

1097

alt_interface_name))

1098

interface_names.add(alt_interface)

959

.replace("se.recompile.Mandos",

960

"se.bsnet.fukt.Mandos"))

1099

961

# Is this a D-Bus signal?

1100

962

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

1101

# Extract the original non-method undecorated

1102

# function by black magic

963

# Extract the original non-method function by

964

# black magic

1103

965

nonmethod_func = (dict(

1104

966

zip(attribute.func_code.co_freevars,

1105

967

attribute.__closure__))["func"]

1116

978

nonmethod_func.func_name,

1117

979

nonmethod_func.func_defaults,

1118

980

nonmethod_func.func_closure)))

1119

# Copy annotations, if any

1120

try:

1121

new_function._dbus_annotations = (

1122

dict(attribute._dbus_annotations))

1123

except AttributeError:

1124

pass

1125

981

# Define a creator of a function to call both the

1126

# original and alternate functions, so both the

1127

# original and alternate signals gets sent when

1128

# the function is called

982

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

983

# signals gets sent when the function is called

1129

984

def fixscope(func1, func2):

1130

985

"""This function is a scope container to pass

1131

986

func1 and func2 to the "call_both" function

1138

993

return call_both

1139

994

# Create the "call_both" function and add it to

1140

995

# the class

1141

attr[attrname] = fixscope(attribute, new_function)

996

attr[attrname] = fixscope(attribute,

997

new_function)

1142

998

# Is this a D-Bus method?

1143

999

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

1144

1000

# Create a new, but exactly alike, function

1155

1011

attribute.func_name,

1156

1012

attribute.func_defaults,

1157

1013

attribute.func_closure)))

1158

# Copy annotations, if any

1159

try:

1160

attr[attrname]._dbus_annotations = (

1161

dict(attribute._dbus_annotations))

1162

except AttributeError:

1163

pass

1164

1014

# Is this a D-Bus property?

1165

1015

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

1166

1016

# Create a new, but exactly alike, function

1180

1030

attribute.func_name,

1181

1031

attribute.func_defaults,

1182

1032

attribute.func_closure)))

1183

# Copy annotations, if any

1184

try:

1185

attr[attrname]._dbus_annotations = (

1186

dict(attribute._dbus_annotations))

1187

except AttributeError:

1188

pass

1189

# Is this a D-Bus interface?

1190

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

1191

# Create a new, but exactly alike, function

1192

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

1193

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

1194

# to the class.

1195

attr[attrname] = (dbus_interface_annotations

1196

(alt_interface)

1197

(types.FunctionType

1198

(attribute.func_code,

1199

attribute.func_globals,

1200

attribute.func_name,

1201

attribute.func_defaults,

1202

attribute.func_closure)))

1203

if deprecate:

1204

# Deprecate all alternate interfaces

1205

iname="_AlternateDBusNames_interface_annotation{0}"

1206

for interface_name in interface_names:

1207

@dbus_interface_annotations(interface_name)

1208

def func(self):

1209

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

1210

"true" }

1211

# Find an unused name

1212

for aname in (iname.format(i)

1213

for i in itertools.count()):

1214

if aname not in attr:

1215

attr[aname] = func

1216

break

1217

if interface_names:

1218

# Replace the class with a new subclass of it with

1219

# methods, signals, etc. as created above.

1220

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

1221

(cls,), attr)

1222

return cls

1223

return wrapper

1224

1225

1226

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

1227

"se.bsnet.fukt.Mandos"})

1033

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

1034

1035

1228

1036

class ClientDBus(Client, DBusObjectWithProperties):

1229

1037

"""A Client class using D-Bus

1230

1038

1241

1049

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

1242

1050

self.bus = bus

1243

1051

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

1052

self._approvals_pending = 0

1053

1054

self._approvals_pending = 0

1244

1055

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

1245

1056

# the D-Bus

1246

1057

client_object_name = unicode(self.name).translate(

1250

1061

("/clients/" + client_object_name))

1251

1062

DBusObjectWithProperties.__init__(self, self.bus,

1252

1063

self.dbus_object_path)

1253

1064

1254

1065

def notifychangeproperty(transform_func,

1255

1066

dbus_name, type_func=lambda x: x,

1256

1067

variant_level=1):

1279

1090

1280

1091

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

1281

1092

1093

1282

1094

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1283

1095

approvals_pending = notifychangeproperty(dbus.Boolean,

1284

1096

"ApprovalPending",

1291

1103

checker is not None)

1292

1104

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1293

1105

"LastCheckedOK")

1294

last_checker_status = notifychangeproperty(dbus.Int16,

1295

"LastCheckerStatus")

1296

1106

last_approval_request = notifychangeproperty(

1297

1107

datetime_to_dbus, "LastApprovalRequest")

1298

1108

approved_by_default = notifychangeproperty(dbus.Boolean,

1366

1176

return False

1367

1177

1368

1178

def approve(self, value=True):

1179

self.send_changedstate()

1369

1180

self.approved = value

1370

1181

gobject.timeout_add(timedelta_to_milliseconds

1371

1182

(self.approval_duration),

1372

1183

self._reset_approved)

1373

self.send_changedstate()

1184

1374

1185

1375

1186

## D-Bus methods, signals & properties

1376

1187

_interface = "se.recompile.Mandos.Client"

1377

1188

1378

## Interfaces

1379

1380

@dbus_interface_annotations(_interface)

1381

def _foo(self):

1382

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

1383

"false"}

1384

1385

1189

## Signals

1386

1190

1387

1191

# CheckerCompleted - signal

1423

1227

"D-Bus signal"

1424

1228

return self.need_approval()

1425

1229

1230

# NeRwequest - signal

1231

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

1232

def NewRequest(self, ip):

1233

"""D-Bus signal

1234

Is sent after a client request a password.

1235

"""

1236

pass

1237

1426

1238

## Methods

1427

1239

1428

1240

# Approve - method

1538

1350

return

1539

1351

return datetime_to_dbus(self.last_checked_ok)

1540

1352

1541

# LastCheckerStatus - property

1542

@dbus_service_property(_interface, signature="n",

1543

access="read")

1544

def LastCheckerStatus_dbus_property(self):

1545

return dbus.Int16(self.last_checker_status)

1546

1547

1353

# Expires - property

1548

1354

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

1549

1355

def Expires_dbus_property(self):

1560

1366

def Timeout_dbus_property(self, value=None):

1561

1367

if value is None: # get

1562

1368

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1564

1369

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

1565

# Reschedule disabling

1370

# Reschedule timeout

1566

1371

if self.enabled:

1567

1372

now = datetime.datetime.utcnow()

1568

self.expires += self.timeout - old_timeout

1569

if self.expires <= now:

1373

time_to_die = timedelta_to_milliseconds(

1374

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

1375

if time_to_die <= 0:

1570

1376

# The timeout has passed

1571

1377

self.disable()

1572

1378

else:

1379

self.expires = (now +

1380

datetime.timedelta(milliseconds =

1381

time_to_die))

1573

1382

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

1574

1383

is None):

1575

1384

return

1576

1385

gobject.source_remove(self.disable_initiator_tag)

1577

self.disable_initiator_tag = (

1578

gobject.timeout_add(

1579

timedelta_to_milliseconds(self.expires - now),

1580

self.disable))

1386

self.disable_initiator_tag = (gobject.timeout_add

1387

(time_to_die,

1388

self.disable))

1581

1389

1582

1390

# ExtendedTimeout - property

1583

1391

@dbus_service_property(_interface, signature="t",

1662

1470

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

1663

1471

1664

1472

1473

class ClientDBusTransitional(ClientDBus):

1474

__metaclass__ = AlternateDBusNamesMetaclass

1475

1476

1665

1477

class ClientHandler(socketserver.BaseRequestHandler, object):

1666

1478

"""A class to handle client connections.

1667

1479

1703

1515

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

1704

1516

try:

1705

1517

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

1706

raise RuntimeError(line)

1518

raise RuntimeError

1707

1519

except (ValueError, IndexError, RuntimeError) as error:

1708

1520

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

1709

1521

return

1735

1547

except KeyError:

1736

1548

return

1737

1549

1550

if self.server.use_dbus:

1551

# Emit D-Bus signal

1552

client.NewRequest(str(self.client_address))

1553

1738

1554

if client.approval_delay:

1739

1555

delay = client.approval_delay

1740

1556

client.approvals_pending += 1

1771

1587

#wait until timeout or approved

1772

1588

time = datetime.datetime.now()

1773

1589

client.changedstate.acquire()

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1590

(client.changedstate.wait

1591

(float(client.timedelta_to_milliseconds(delay)

1592

/ 1000)))

1777

1593

client.changedstate.release()

1778

1594

time2 = datetime.datetime.now()

1779

1595

if (time2 - time) >= delay:

1795

1611

try:

1796

1612

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

1797

1613

except gnutls.errors.GNUTLSError as error:

1798

logger.warning("gnutls send failed",

1799

exc_info=error)

1614

logger.warning("gnutls send failed")

1800

1615

return

1801

1616

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

1802

1617

sent, len(client.secret)

1805

1620

1806

1621

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

1807

1622

# bump the timeout using extended_timeout

1808

client.bump_timeout(client.extended_timeout)

1623

client.checked_ok(client.extended_timeout)

1809

1624

if self.server.use_dbus:

1810

1625

# Emit D-Bus signal

1811

1626

client.GotSecret()

1816

1631

try:

1817

1632

session.bye()

1818

1633

except gnutls.errors.GNUTLSError as error:

1819

logger.warning("GnuTLS bye failed",

1820

exc_info=error)

1634

logger.warning("GnuTLS bye failed")

1821

1635

1822

1636

@staticmethod

1823

1637

def peer_certificate(session):

1895

1709

def process_request(self, request, address):

1896

1710

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

1897

1711

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

1898

args = (request, address))

1712

args = (request,

1713

address))

1899

1714

proc.start()

1900

1715

return proc

1901

1716

1916

1731

1917

1732

def add_pipe(self, parent_pipe, proc):

1918

1733

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

1919

raise NotImplementedError()

1734

raise NotImplementedError

1920

1735

1921

1736

1922

1737

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1929

1744

use_ipv6: Boolean; to use IPv6 or not

1930

1745

"""

1931

1746

def __init__(self, server_address, RequestHandlerClass,

1932

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

1933

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

1934

creating a new one with socket.socket().

1935

"""

1747

interface=None, use_ipv6=True):

1936

1748

self.interface = interface

1937

1749

if use_ipv6:

1938

1750

self.address_family = socket.AF_INET6

1939

if socketfd is not None:

1940

# Save the file descriptor

1941

self.socketfd = socketfd

1942

# Save the original socket.socket() function

1943

self.socket_socket = socket.socket

1944

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

1945

#

1946

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

1947

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

1948

# patching socket.socket.)

1949

#

1950

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

1951

@functools.wraps(socket.socket)

1952

def socket_wrapper(*args, **kwargs):

1953

# Restore original function so subsequent calls are

1954

# not affected.

1955

socket.socket = self.socket_socket

1956

del self.socket_socket

1957

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

1958

# saved file descriptor.

1959

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

1960

# Replace socket.socket() function with wrapper

1961

socket.socket = socket_wrapper

1962

# The socketserver.TCPServer.__init__ will call

1963

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

1964

# socket_wrapper(), if socketfd was set.

1965

1751

socketserver.TCPServer.__init__(self, server_address,

1966

1752

RequestHandlerClass)

1967

1968

1753

def server_bind(self):

1969

1754

"""This overrides the normal server_bind() function

1970

1755

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

1978

1763

try:

1979

1764

self.socket.setsockopt(socket.SOL_SOCKET,

1980

1765

SO_BINDTODEVICE,

1981

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

1766

str(self.interface

1767

+ '\0'))

1982

1768

except socket.error as error:

1983

if error.errno == errno.EPERM:

1984

logger.error("No permission to bind to"

1985

" interface %s", self.interface)

1986

elif error.errno == errno.ENOPROTOOPT:

1769

if error[0] == errno.EPERM:

1770

logger.error("No permission to"

1771

" bind to interface %s",

1772

self.interface)

1773

elif error[0] == errno.ENOPROTOOPT:

1987

1774

logger.error("SO_BINDTODEVICE not available;"

1988

1775

" cannot bind to interface %s",

1989

1776

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

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

1992

" cannot bind", self.interface)

1993

1777

else:

1994

1778

raise

1995

1779

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

1998

1782

if self.address_family == socket.AF_INET6:

1999

1783

any_address = "::" # in6addr_any

2000

1784

else:

2001

any_address = "0.0.0.0" # INADDR_ANY

1785

any_address = socket.INADDR_ANY

2002

1786

self.server_address = (any_address,

2003

1787

self.server_address[1])

2004

1788

elif not self.server_address[1]:

2025

1809

"""

2026

1810

def __init__(self, server_address, RequestHandlerClass,

2027

1811

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

2028

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

1812

gnutls_priority=None, use_dbus=True):

2029

1813

self.enabled = False

2030

1814

self.clients = clients

2031

1815

if self.clients is None:

2035

1819

IPv6_TCPServer.__init__(self, server_address,

2036

1820

RequestHandlerClass,

2037

1821

interface = interface,

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1822

use_ipv6 = use_ipv6)

2040

1823

def server_activate(self):

2041

1824

if self.enabled:

2042

1825

return socketserver.TCPServer.server_activate(self)

2055

1838

2056

1839

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

2057

1840

proc = None, client_object=None):

1841

condition_names = {

1842

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

1843

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

1844

# blocking).

1845

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

1846

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

1847

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

1848

# broken, usually for pipes and

1849

# sockets).

1850

}

1851

conditions_string = ' | '.join(name

1852

for cond, name in

1853

condition_names.iteritems()

1854

if cond & condition)

2058

1855

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

2059

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

1856

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

2060

1857

# Wait for other process to exit

2061

1858

proc.join()

2062

1859

return False

2120

1917

return True

2121

1918

2122

1919

2123

def rfc3339_duration_to_delta(duration):

2124

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

2125

2126

>>> rfc3339_duration_to_delta("P7D")

2127

datetime.timedelta(7)

2128

>>> rfc3339_duration_to_delta("PT60S")

2129

datetime.timedelta(0, 60)

2130

>>> rfc3339_duration_to_delta("PT60M")

2131

datetime.timedelta(0, 3600)

2132

>>> rfc3339_duration_to_delta("PT24H")

2133

datetime.timedelta(1)

2134

>>> rfc3339_duration_to_delta("P1W")

2135

datetime.timedelta(7)

2136

>>> rfc3339_duration_to_delta("PT5M30S")

2137

datetime.timedelta(0, 330)

2138

>>> rfc3339_duration_to_delta("P1DT3M20S")

2139

datetime.timedelta(1, 200)

2140

"""

2141

2142

# Parsing an RFC 3339 duration with regular expressions is not

2143

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

2144

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

2145

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

2146

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

2147

# avoid excessive use of external libraries.

2148

2149

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

2150

Token = collections.namedtuple("Token",

2151

("regexp", # To match token; if

2152

# "value" is not None,

2153

# must have a "group"

2154

# containing digits

2155

"value", # datetime.timedelta or

2156

# None

2157

"followers")) # Tokens valid after

2158

# this token

2159

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

2160

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

2161

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

2162

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

2163

datetime.timedelta(seconds=1),

2164

frozenset((token_end,)))

2165

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

2166

datetime.timedelta(minutes=1),

2167

frozenset((token_second, token_end)))

2168

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

2169

datetime.timedelta(hours=1),

2170

frozenset((token_minute, token_end)))

2171

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

2172

None,

2173

frozenset((token_hour, token_minute,

2174

token_second)))

2175

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

2176

datetime.timedelta(days=1),

2177

frozenset((token_time, token_end)))

2178

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

2179

datetime.timedelta(weeks=4),

2180

frozenset((token_day, token_end)))

2181

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

2182

datetime.timedelta(weeks=52),

2183

frozenset((token_month, token_end)))

2184

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

2185

datetime.timedelta(weeks=1),

2186

frozenset((token_end,)))

2187

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

2188

frozenset((token_year, token_month,

2189

token_day, token_time,

2190

token_week))),

2191

# Define starting values

2192

value = datetime.timedelta() # Value so far

2193

found_token = None

2194

followers = frozenset(token_duration,) # Following valid tokens

2195

s = duration # String left to parse

2196

# Loop until end token is found

2197

while found_token is not token_end:

2198

# Search for any currently valid tokens

2199

for token in followers:

2200

match = token.regexp.match(s)

2201

if match is not None:

2202

# Token found

2203

if token.value is not None:

2204

# Value found, parse digits

2205

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

2206

# Add to value so far

2207

value += factor * token.value

2208

# Strip token from string

2209

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

2210

# Go to found token

2211

found_token = token

2212

# Set valid next tokens

2213

followers = found_token.followers

2214

break

2215

else:

2216

# No currently valid tokens were found

2217

raise ValueError("Invalid RFC 3339 duration")

2218

# End token found

2219

return value

2220

2221

2222

1920

def string_to_delta(interval):

2223

1921

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

2224

1922

2235

1933

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

2236

1934

datetime.timedelta(0, 330)

2237

1935

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

2244

1936

timevalue = datetime.timedelta(0)

2245

1937

for s in interval.split():

2246

1938

try:

2257

1949

elif suffix == "w":

2258

1950

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

2259

1951

else:

2260

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

2261

.format(suffix))

2262

except IndexError as e:

1952

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

1953

except (ValueError, IndexError) as e:

2263

1954

raise ValueError(*(e.args))

2264

1955

timevalue += delta

2265

1956

return timevalue

2278

1969

sys.exit()

2279

1970

if not noclose:

2280

1971

# Close all standard open file descriptors

2281

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

1972

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

2282

1973

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

2283

1974

raise OSError(errno.ENODEV,

2284

"{0} not a character device"

2285

.format(os.devnull))

1975

"%s not a character device"

1976

% os.path.devnull)

2286

1977

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

2287

1978

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

2288

1979

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

2297

1988

2298

1989

parser = argparse.ArgumentParser()

2299

1990

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

2300

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

1991

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

2301

1992

help="show version number and exit")

2302

1993

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

2303

1994

help="Bind to interface IF")

2309

2000

help="Run self-test")

2310

2001

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

2311

2002

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

2312

" to terminal", default=None)

2003

" to terminal")

2313

2004

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

2314

2005

help="Debug level for stdout output")

2315

2006

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

2322

2013

" files")

2323

2014

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

2324

2015

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

2325

" system bus interface", default=None)

2016

" system bus interface")

2326

2017

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

2327

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

2328

default=None)

2018

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

2329

2019

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

2330

2020

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

2331

" state", default=None)

2332

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

2333

help="Specify a file descriptor to a network"

2334

" socket to use instead of creating one")

2021

" state")

2335

2022

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

2336

2023

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

2337

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

2338

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

2339

2024

2340

2025

options = parser.parse_args()

2341

2026

2350

2035

"port": "",

2351

2036

"debug": "False",

2352

2037

"priority":

2353

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

2038

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

2354

2039

"servicename": "Mandos",

2355

2040

"use_dbus": "True",

2356

2041

"use_ipv6": "True",

2357

2042

"debuglevel": "",

2358

2043

"restore": "True",

2359

"socket": "",

2360

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

2361

"foreground": "False",

2044

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

2362

2045

}

2363

2046

2364

2047

# Parse config file for server-global settings

2369

2052

# Convert the SafeConfigParser object to a dict

2370

2053

server_settings = server_config.defaults()

2371

2054

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

2372

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

2055

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

2373

2056

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

2374

2057

option)

2375

2058

if server_settings["port"]:

2376

2059

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

2377

2060

"port")

2378

if server_settings["socket"]:

2379

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

2380

"socket")

2381

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

2382

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

2383

# happen with a supplied network socket.

2384

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

2385

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

2386

["socket"])

2387

2061

del server_config

2388

2062

2389

2063

# Override the settings from the config file with command line

2391

2065

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

2392

2066

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

2393

2067

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

2394

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

2068

"statedir"):

2395

2069

value = getattr(options, option)

2396

2070

if value is not None:

2397

2071

server_settings[option] = value

2400

2074

for option in server_settings.keys():

2401

2075

if type(server_settings[option]) is str:

2402

2076

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

2403

# Force all boolean options to be boolean

2404

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

2405

"foreground"):

2406

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

2407

# Debug implies foreground

2408

if server_settings["debug"]:

2409

server_settings["foreground"] = True

2410

2077

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

2411

2078

2412

2079

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

2418

2085

use_ipv6 = server_settings["use_ipv6"]

2419

2086

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

2420

2087

stored_state_file)

2421

foreground = server_settings["foreground"]

2422

2088

2423

2089

if debug:

2424

2090

initlogger(debug, logging.DEBUG)

2431

2097

2432

2098

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

2433

2099

syslogger.setFormatter(logging.Formatter

2434

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

2435

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

2436

.format(server_settings

2437

["servicename"])))

2100

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

2101

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

2102

% server_settings["servicename"]))

2438

2103

2439

2104

# Parse config file with clients

2440

2105

client_config = configparser.SafeConfigParser(Client

2453

2118

use_ipv6=use_ipv6,

2454

2119

gnutls_priority=

2455

2120

server_settings["priority"],

2456

use_dbus=use_dbus,

2457

socketfd=(server_settings["socket"]

2458

or None))

2459

if not foreground:

2460

pidfilename = "/run/mandos.pid"

2461

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

2462

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

2463

pidfile = None

2121

use_dbus=use_dbus)

2122

if not debug:

2123

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

2464

2124

try:

2465

2125

pidfile = open(pidfilename, "w")

2466

except IOError as e:

2467

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

2468

exc_info=e)

2126

except IOError:

2127

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

2469

2128

2470

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

2129

try:

2130

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

2131

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

2132

except KeyError:

2471

2133

try:

2472

uid = pwd.getpwnam(name).pw_uid

2473

gid = pwd.getpwnam(name).pw_gid

2474

break

2134

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

2135

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

2475

2136

except KeyError:

2476

continue

2477

else:

2478

uid = 65534

2479

gid = 65534

2137

try:

2138

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

2139

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

2140

except KeyError:

2141

uid = 65534

2142

gid = 65534

2480

2143

try:

2481

2144

os.setgid(gid)

2482

2145

os.setuid(uid)

2483

2146

except OSError as error:

2484

if error.errno != errno.EPERM:

2485

raise

2147

if error[0] != errno.EPERM:

2148

raise error

2486

2149

2487

2150

if debug:

2488

2151

# Enable all possible GnuTLS debugging

2499

2162

.gnutls_global_set_log_function(debug_gnutls))

2500

2163

2501

2164

# Redirect stdin so all checkers get /dev/null

2502

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

2165

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

2503

2166

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

2504

2167

if null > 2:

2505

2168

os.close(null)

2506

2169

2507

2170

# Need to fork before connecting to D-Bus

2508

if not foreground:

2171

if not debug:

2509

2172

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

2510

2173

daemon()

2511

2174

2512

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

2513

# need to inform gobject that threads will be used.

2514

2175

gobject.threads_init()

2515

2176

2516

2177

global main_loop

2517

2178

# From the Avahi example code

2518

DBusGMainLoop(set_as_default=True)

2179

DBusGMainLoop(set_as_default=True )

2519

2180

main_loop = gobject.MainLoop()

2520

2181

bus = dbus.SystemBus()

2521

2182

# End of Avahi example code

2527

2188

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

2528

2189

do_not_queue=True))

2529

2190

except dbus.exceptions.NameExistsException as e:

2530

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

2191

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

2531

2192

use_dbus = False

2532

2193

server_settings["use_dbus"] = False

2533

2194

tcp_server.use_dbus = False

2545

2206

2546

2207

client_class = Client

2547

2208

if use_dbus:

2548

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

2209

client_class = functools.partial(ClientDBusTransitional,

2210

bus = bus)

2549

2211

2550

2212

client_settings = Client.config_parser(client_config)

2551

2213

old_client_settings = {}

2552

2214

clients_data = {}

2553

2215

2554

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

2555

global wnull

2556

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

2557

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

2558

# mode

2559

if debug or not foreground:

2560

wnull.close()

2561

2562

2216

# Get client data and settings from last running state.

2563

2217

if server_settings["restore"]:

2564

2218

try:

2567

2221

(stored_state))

2568

2222

os.remove(stored_state_path)

2569

2223

except IOError as e:

2570

if e.errno == errno.ENOENT:

2571

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

2572

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

2573

else:

2574

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

2575

exc_info=e)

2224

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

2225

.format(e))

2226

if e.errno != errno.ENOENT:

2576

2227

raise

2577

2228

except EOFError as e:

2578

2229

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

2579

"EOFError:", exc_info=e)

2230

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

2580

2231

2581

2232

with PGPEngine() as pgp:

2582

2233

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2587

2234

# Decide which value to use after restoring saved state.

2588

2235

# We have three different values: Old config file,

2589

2236

# new config file, and saved state.

2603

2250

2604

2251

# Clients who has passed its expire date can still be

2605

2252

# enabled if its last checker was successful. Clients

2606

# whose checker succeeded before we stored its state is

2607

# assumed to have successfully run all checkers during

2608

# downtime.

2253

# whose checker failed before we stored its state is

2254

# assumed to have failed all checkers during downtime.

2609

2255

if client["enabled"]:

2610

2256

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

2611

2257

if not client["last_checked_ok"]:

2612

2258

logger.warning(

2613

2259

"disabling client {0} - Client never "

2614

"performed a successful checker"

2615

.format(client_name))

2260

"performed a successfull checker"

2261

.format(client["name"]))

2616

2262

client["enabled"] = False

2617

2263

elif client["last_checker_status"] != 0:

2618

2264

logger.warning(

2619

2265

"disabling client {0} - Client "

2620

2266

"last checker failed with error code {1}"

2621

.format(client_name,

2267

.format(client["name"],

2622

2268

client["last_checker_status"]))

2623

2269

client["enabled"] = False

2624

2270

else:

2627

2273

+ client["timeout"])

2628

2274

logger.debug("Last checker succeeded,"

2629

2275

" keeping {0} enabled"

2630

.format(client_name))

2276

.format(client["name"]))

2631

2277

try:

2632

2278

client["secret"] = (

2633

2279

pgp.decrypt(client["encrypted_secret"],

2639

2285

.format(client_name))

2640

2286

client["secret"] = (

2641

2287

client_settings[client_name]["secret"])

2288

2642

2289

2643

2290

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

2644

2291

for client_name in (set(old_client_settings)

2647

2294

for client_name in (set(client_settings)

2648

2295

- set(old_client_settings)):

2649

2296

clients_data[client_name] = client_settings[client_name]

2650

2651

# Create all client objects

2297

2298

# Create clients all clients

2652

2299

for client_name, client in clients_data.iteritems():

2653

2300

tcp_server.clients[client_name] = client_class(

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2301

name = client_name, settings = client)

2656

2302

2657

2303

if not tcp_server.clients:

2658

2304

logger.warning("No clients defined")

2659

2660

if not foreground:

2661

if pidfile is not None:

2662

try:

2663

with pidfile:

2664

pid = os.getpid()

2665

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

2666

except IOError:

2667

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

2668

pidfilename, pid)

2669

del pidfile

2305

2306

if not debug:

2307

try:

2308

with pidfile:

2309

pid = os.getpid()

2310

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

2311

del pidfile

2312

except IOError:

2313

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

2314

pidfilename, pid)

2315

except NameError:

2316

# "pidfile" was never created

2317

pass

2670

2318

del pidfilename

2319

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

2671

2320

2672

2321

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

2673

2322

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

2674

2323

2675

2324

if use_dbus:

2676

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

2677

"se.bsnet.fukt.Mandos"})

2678

class MandosDBusService(DBusObjectWithProperties):

2325

class MandosDBusService(dbus.service.Object):

2679

2326

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

2680

2327

def __init__(self):

2681

2328

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

2682

2329

_interface = "se.recompile.Mandos"

2683

2330

2684

@dbus_interface_annotations(_interface)

2685

def _foo(self):

2686

return { "org.freedesktop.DBus.Property"

2687

".EmitsChangedSignal":

2688

"false"}

2689

2690

2331

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

2691

2332

def ClientAdded(self, objpath):

2692

2333

"D-Bus signal"

2734

2375

2735

2376

del _interface

2736

2377

2737

mandos_dbus_service = MandosDBusService()

2378

class MandosDBusServiceTransitional(MandosDBusService):

2379

__metaclass__ = AlternateDBusNamesMetaclass

2380

mandos_dbus_service = MandosDBusServiceTransitional()

2738

2381

2739

2382

def cleanup():

2740

2383

"Cleanup function; run on exit"

2741

2384

service.cleanup()

2742

2385

2743

2386

multiprocessing.active_children()

2744

wnull.close()

2745

2387

if not (tcp_server.clients or client_settings):

2746

2388

return

2747

2389

2759

2401

# A list of attributes that can not be pickled

2760

2402

# + secret.

2761

2403

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

2762

"checker", "server_settings"))

2404

"checker"))

2763

2405

for name, typ in (inspect.getmembers

2764

2406

(dbus.service.Object)):

2765

2407

exclude.add(name)

2774

2416

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

2775

2417

2776

2418

try:

2777

with (tempfile.NamedTemporaryFile

2778

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

2779

dir=os.path.dirname(stored_state_path),

2780

delete=False)) as stored_state:

2419

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

2420

prefix="clients-",

2421

dir=os.path.dirname

2422

(stored_state_path))

2423

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

2781

2424

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

2782

tempname=stored_state.name

2783

2425

os.rename(tempname, stored_state_path)

2784

2426

except (IOError, OSError) as e:

2427

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

2428

.format(e))

2785

2429

if not debug:

2786

2430

try:

2787

2431

os.remove(tempname)

2788

2432

except NameError:

2789

2433

pass

2790

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

2791

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

2792

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

2793

else:

2794

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

2795

exc_info=e)

2796

raise

2434

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

2435

errno.EEXIST)):

2436

raise e

2797

2437

2798

2438

# Delete all clients, and settings from config

2799

2439

while tcp_server.clients:

2826

2466

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

2827

2467

if use_ipv6:

2828

2468

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

2829

" flowinfo %d, scope_id %d",

2830

*tcp_server.socket.getsockname())

2469

" flowinfo %d, scope_id %d"

2470

% tcp_server.socket.getsockname())

2831

2471

else: # IPv4

2832

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

2833

*tcp_server.socket.getsockname())

2472

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

2473

% tcp_server.socket.getsockname())

2834

2474

2835

2475

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

2836

2476

2839

2479

try:

2840

2480

service.activate()

2841

2481

except dbus.exceptions.DBusException as error:

2842

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

2482

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

2843

2483

cleanup()

2844

2484

sys.exit(1)

2845

2485

# End of Avahi example code

2852

2492

logger.debug("Starting main loop")

2853

2493

main_loop.run()

2854

2494

except AvahiError as error:

2855

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

2495

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

2856

2496

cleanup()

2857

2497

sys.exit(1)

2858

2498

except KeyboardInterrupt: