/mandos/trunk : revision 636

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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 = "1.4.1"

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version = "1.6.2"

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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.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet',

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'--no-use-agent'])

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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

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self._cleanup()

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return False

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def password_encode(self, password):

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

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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class AvahiError(Exception):

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

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self.value = value

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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

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.format(error))

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def cleanup(self):

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

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if self.group is not None:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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"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, or None.

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checker, -2 means no checker completed yet.

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

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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 password has been sent

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extended_timeout: extra long timeout when secret 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", "fingerprint",

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

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

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

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"last_approval_request", "last_checked_ok",

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

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

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"extended_timeout": "15m",

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"interval": "2m",

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def 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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# 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, "enabled")

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

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"enabled")

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

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.replace(" ", ""))

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"rb") as secfile:

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

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else:

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

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% section)

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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client["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"] = None

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client["last_checker_status"] = -2

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return settings

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

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

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

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attribute."""

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

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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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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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# function

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

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self.created = settings.get("created", datetime.datetime.utcnow())

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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()

579

if not quiet:

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

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

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

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

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

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

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gobject.source_remove(self.checker_initiator_tag)

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608

self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

611

if not quiet:

612

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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615

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619

def init_checker(self):

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

598

621

# 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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624

self.checker_initiator_tag = (gobject.timeout_add

600

625

(self.interval_milliseconds(),

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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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self.disable_initiator_tag = (gobject.timeout_add

604

631

(self.timeout_milliseconds(),

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632

self.disable))

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

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652

vars(self))

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653

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def checked_ok(self, timeout=None):

628

"""Bump up the timeout for this client.

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630

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

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alive and well.

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"""

654

def checked_ok(self):

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

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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):

661

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

633

662

if timeout is None:

634

663

timeout = self.timeout

635

self.last_checked_ok = datetime.datetime.utcnow()

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664

if self.disable_initiator_tag is not None:

637

665

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

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667

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

639

668

self.disable_initiator_tag = (gobject.timeout_add

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669

(timedelta_to_milliseconds

650

679

If a checker already exists, leave it running and do

651

680

nothing."""

652

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

653

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

654

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

655

# client would inevitably timeout, since no checker would get

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

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

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

658

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

659

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# should be.

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self.current_checker_command)

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# Start a new checker if needed

675

704

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)

676

710

try:

677

# In case checker_command has exactly one % operator

678

command = self.checker_command % self.host

679

except TypeError:

680

# Escape attributes for the shell

681

escaped_attrs = dict(

682

(attr,

683

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

684

errors=

685

'replace')))

686

for attr in

687

self.runtime_expansions)

688

689

try:

690

command = self.checker_command % escaped_attrs

691

except TypeError as error:

692

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

693

' %s', self.checker_command, error)

694

return True # Try again later

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

695

716

self.current_checker_command = command

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717

try:

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718

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

700

721

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

701

722

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

702

723

# 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 })

703

732

self.checker = subprocess.Popen(command,

704

733

close_fds=True,

705

shell=True, cwd="/")

706

self.checker_callback_tag = (gobject.child_watch_add

707

(self.checker.pid,

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self.checker_callback,

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data=command))

710

# The checker may have completed before the gobject

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# watch was added. Check for this.

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,

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data=command))

744

# The checker may have completed before the gobject

745

# watch was added. Check for this.

746

try:

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747

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

713

if pid:

714

gobject.source_remove(self.checker_callback_tag)

715

self.checker_callback(pid, status, command)

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748

except OSError as error:

717

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

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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:

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gobject.source_remove(self.checker_callback_tag)

757

self.checker_callback(pid, status, command)

719

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

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return True

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760

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767

return

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768

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

730

769

try:

731

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

770

self.checker.terminate()

732

771

#time.sleep(0.5)

733

772

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

734

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

773

# self.checker.kill()

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774

except OSError as error:

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775

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

737

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raise

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793

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

755

794

if byte_arrays and signature != "ay":

756

795

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

757

" signature %r" % signature)

796

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

758

797

def decorator(func):

759

798

func._dbus_is_property = True

760

799

func._dbus_interface = dbus_interface

768

807

return decorator

769

808

770

809

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

771

847

class DBusPropertyException(dbus.exceptions.DBusException):

772

848

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

773

849

"""

796

872

"""

797

873

798

874

@staticmethod

799

def _is_dbus_property(obj):

800

return getattr(obj, "_dbus_is_property", False)

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)

801

883

802

def _get_all_dbus_properties(self):

884

def _get_all_dbus_things(self, thing):

803

885

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

804

886

"""

805

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

887

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

888

name),

889

athing.__get__(self))

806

890

for cls in self.__class__.__mro__

807

for name, prop in

808

inspect.getmembers(cls, self._is_dbus_property))

891

for name, athing in

892

inspect.getmembers(cls,

893

self._is_dbus_thing(thing)))

809

894

810

895

def _get_dbus_property(self, interface_name, property_name):

811

896

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

813

898

"""

814

899

for cls in self.__class__.__mro__:

815

900

for name, value in (inspect.getmembers

816

(cls, self._is_dbus_property)):

901

(cls,

902

self._is_dbus_thing("property"))):

817

903

if (value._dbus_name == property_name

818

904

and value._dbus_interface == interface_name):

819

905

return value.__get__(self)

848

934

# signatures other than "ay".

849

935

if prop._dbus_signature != "ay":

850

936

raise ValueError

851

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

852

for byte in value))

937

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

938

for byte in value))

853

939

prop(value)

854

940

855

941

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

861

947

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

862

948

"""

863

949

properties = {}

864

for name, prop in self._get_all_dbus_properties():

950

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

865

951

if (interface_name

866

952

and interface_name != prop._dbus_interface):

867

953

# Interface non-empty but did not match

882

968

path_keyword='object_path',

883

969

connection_keyword='connection')

884

970

def Introspect(self, object_path, connection):

885

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

971

"""Overloading of standard D-Bus method.

972

973

Inserts property tags and interface annotation tags.

886

974

"""

887

975

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

888

976

connection)

895

983

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

896

984

return e

897

985

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

986

# Add property tags

898

987

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

899

988

for name, prop

900

in self._get_all_dbus_properties()

989

in self._get_all_dbus_things("property")

901

990

if prop._dbus_interface

902

991

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

903

992

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)

904

1024

# Add the names to the return values for the

905

1025

# "org.freedesktop.DBus.Properties" methods

906

1026

if (if_tag.getAttribute("name")

921

1041

except (AttributeError, xml.dom.DOMException,

922

1042

xml.parsers.expat.ExpatError) as error:

923

1043

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

924

error)

1044

exc_info=error)

925

1045

return xmlstring

926

1046

927

1047

928

def datetime_to_dbus (dt, variant_level=0):

1048

def datetime_to_dbus(dt, variant_level=0):

929

1049

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

930

1050

if dt is None:

931

1051

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

933

1053

variant_level=variant_level)

934

1054

935

1055

936

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

937

.__metaclass__):

938

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

939

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

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).

940

1078

"""

941

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

942

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

943

# methods, signals, or properties in them

944

for base in (b for b in bases

945

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

946

# Go though all attributes of the base class

947

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

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):

948

1086

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

949

1087

# with the wrong interface name

950

1088

if (not hasattr(attribute, "_dbus_interface")

951

1089

or not attribute._dbus_interface

952

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

1090

.startswith(orig_interface_name)):

953

1091

continue

954

1092

# Create an alternate D-Bus interface name based on

955

1093

# the current name

956

1094

alt_interface = (attribute._dbus_interface

957

.replace("se.recompile.Mandos",

958

"se.bsnet.fukt.Mandos"))

1095

.replace(orig_interface_name,

1096

alt_interface_name))

1097

interface_names.add(alt_interface)

959

1098

# Is this a D-Bus signal?

960

1099

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

961

# Extract the original non-method function by

962

# black magic

1100

# Extract the original non-method undecorated

1101

# function by black magic

963

1102

nonmethod_func = (dict(

964

1103

zip(attribute.func_code.co_freevars,

965

1104

attribute.__closure__))["func"]

976

1115

nonmethod_func.func_name,

977

1116

nonmethod_func.func_defaults,

978

1117

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

979

1124

# Define a creator of a function to call both the

980

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

981

# signals gets sent when the function is called

1125

# original and alternate functions, so both the

1126

# original and alternate signals gets sent when

1127

# the function is called

982

1128

def fixscope(func1, func2):

983

1129

"""This function is a scope container to pass

984

1130

func1 and func2 to the "call_both" function

991

1137

return call_both

992

1138

# Create the "call_both" function and add it to

993

1139

# the class

994

attr[attrname] = fixscope(attribute,

995

new_function)

1140

attr[attrname] = fixscope(attribute, new_function)

996

1141

# Is this a D-Bus method?

997

1142

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

998

1143

# Create a new, but exactly alike, function

1009

1154

attribute.func_name,

1010

1155

attribute.func_defaults,

1011

1156

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

1012

1163

# Is this a D-Bus property?

1013

1164

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

1014

1165

# Create a new, but exactly alike, function

1028

1179

attribute.func_name,

1029

1180

attribute.func_defaults,

1030

1181

attribute.func_closure)))

1031

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

1032

1033

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"})

1034

1227

class ClientDBus(Client, DBusObjectWithProperties):

1035

1228

"""A Client class using D-Bus

1036

1229

1047

1240

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

1048

1241

self.bus = bus

1049

1242

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

1050

self._approvals_pending = 0

1051

1052

self._approvals_pending = 0

1053

1243

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

1054

1244

# the D-Bus

1055

1245

client_object_name = unicode(self.name).translate(

1059

1249

("/clients/" + client_object_name))

1060

1250

DBusObjectWithProperties.__init__(self, self.bus,

1061

1251

self.dbus_object_path)

1062

1252

1063

1253

def notifychangeproperty(transform_func,

1064

1254

dbus_name, type_func=lambda x: x,

1065

1255

variant_level=1):

1088

1278

1089

1279

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

1090

1280

1091

1092

1281

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1093

1282

approvals_pending = notifychangeproperty(dbus.Boolean,

1094

1283

"ApprovalPending",

1101

1290

checker is not None)

1102

1291

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1103

1292

"LastCheckedOK")

1293

last_checker_status = notifychangeproperty(dbus.Int16,

1294

"LastCheckerStatus")

1104

1295

last_approval_request = notifychangeproperty(

1105

1296

datetime_to_dbus, "LastApprovalRequest")

1106

1297

approved_by_default = notifychangeproperty(dbus.Boolean,

1174

1365

return False

1175

1366

1176

1367

def approve(self, value=True):

1177

self.send_changedstate()

1178

1368

self.approved = value

1179

1369

gobject.timeout_add(timedelta_to_milliseconds

1180

1370

(self.approval_duration),

1181

1371

self._reset_approved)

1182

1372

self.send_changedstate()

1183

1373

1184

1374

## D-Bus methods, signals & properties

1185

1375

_interface = "se.recompile.Mandos.Client"

1186

1376

1377

## Interfaces

1378

1379

@dbus_interface_annotations(_interface)

1380

def _foo(self):

1381

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

1382

"false"}

1383

1187

1384

## Signals

1188

1385

1189

1386

# CheckerCompleted - signal

1225

1422

"D-Bus signal"

1226

1423

return self.need_approval()

1227

1424

1228

# NeRwequest - signal

1229

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

1230

def NewRequest(self, ip):

1231

"""D-Bus signal

1232

Is sent after a client request a password.

1233

"""

1234

pass

1235

1236

1425

## Methods

1237

1426

1238

1427

# Approve - method

1348

1537

return

1349

1538

return datetime_to_dbus(self.last_checked_ok)

1350

1539

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

1351

1546

# Expires - property

1352

1547

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

1353

1548

def Expires_dbus_property(self):

1364

1559

def Timeout_dbus_property(self, value=None):

1365

1560

if value is None: # get

1366

1561

return dbus.UInt64(self.timeout_milliseconds())

1562

old_timeout = self.timeout

1367

1563

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

1368

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

1369

return

1370

# Reschedule timeout

1371

gobject.source_remove(self.disable_initiator_tag)

1372

self.disable_initiator_tag = None

1373

self.expires = None

1374

time_to_die = timedelta_to_milliseconds((self

1375

.last_checked_ok

1376

+ self.timeout)

1377

- datetime.datetime

1378

.utcnow())

1379

if time_to_die <= 0:

1380

# The timeout has passed

1381

self.disable()

1382

else:

1383

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

1384

+ datetime.timedelta(milliseconds =

1385

time_to_die))

1386

self.disable_initiator_tag = (gobject.timeout_add

1387

(time_to_die, self.disable))

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))

1388

1580

1389

1581

# ExtendedTimeout - property

1390

1582

@dbus_service_property(_interface, signature="t",

1469

1661

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

1470

1662

1471

1663

1472

class ClientDBusTransitional(ClientDBus):

1473

__metaclass__ = AlternateDBusNamesMetaclass

1474

1475

1476

1664

class ClientHandler(socketserver.BaseRequestHandler, object):

1477

1665

"""A class to handle client connections.

1478

1666

1546

1734

except KeyError:

1547

1735

return

1548

1736

1549

if self.server.use_dbus:

1550

# Emit D-Bus signal

1551

client.NewRequest(str(self.client_address))

1552

1553

1737

if client.approval_delay:

1554

1738

delay = client.approval_delay

1555

1739

client.approvals_pending += 1

1586

1770

#wait until timeout or approved

1587

1771

time = datetime.datetime.now()

1588

1772

client.changedstate.acquire()

1589

(client.changedstate.wait

1590

(float(client.timedelta_to_milliseconds(delay)

1591

/ 1000)))

1773

client.changedstate.wait(

1774

float(timedelta_to_milliseconds(delay)

1775

/ 1000))

1592

1776

client.changedstate.release()

1593

1777

time2 = datetime.datetime.now()

1594

1778

if (time2 - time) >= delay:

1610

1794

try:

1611

1795

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

1612

1796

except gnutls.errors.GNUTLSError as error:

1613

logger.warning("gnutls send failed")

1797

logger.warning("gnutls send failed",

1798

exc_info=error)

1614

1799

return

1615

1800

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

1616

1801

sent, len(client.secret)

1619

1804

1620

1805

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

1621

1806

# bump the timeout using extended_timeout

1622

client.checked_ok(client.extended_timeout)

1807

client.bump_timeout(client.extended_timeout)

1623

1808

if self.server.use_dbus:

1624

1809

# Emit D-Bus signal

1625

1810

client.GotSecret()

1630

1815

try:

1631

1816

session.bye()

1632

1817

except gnutls.errors.GNUTLSError as error:

1633

logger.warning("GnuTLS bye failed")

1818

logger.warning("GnuTLS bye failed",

1819

exc_info=error)

1634

1820

1635

1821

@staticmethod

1636

1822

def peer_certificate(session):

1708

1894

def process_request(self, request, address):

1709

1895

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

1710

1896

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

1711

args = (request,

1712

address))

1897

args = (request, address))

1713

1898

proc.start()

1714

1899

return proc

1715

1900

1743

1928

use_ipv6: Boolean; to use IPv6 or not

1744

1929

"""

1745

1930

def __init__(self, server_address, RequestHandlerClass,

1746

interface=None, use_ipv6=True):

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

"""

1747

1935

self.interface = interface

1748

1936

if use_ipv6:

1749

1937

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.

1750

1964

socketserver.TCPServer.__init__(self, server_address,

1751

1965

RequestHandlerClass)

1966

1752

1967

def server_bind(self):

1753

1968

"""This overrides the normal server_bind() function

1754

1969

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

1762

1977

try:

1763

1978

self.socket.setsockopt(socket.SOL_SOCKET,

1764

1979

SO_BINDTODEVICE,

1765

str(self.interface

1766

+ '\0'))

1980

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

1767

1981

except socket.error as error:

1768

if error[0] == errno.EPERM:

1769

logger.error("No permission to"

1770

" bind to interface %s",

1771

self.interface)

1772

elif error[0] == errno.ENOPROTOOPT:

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:

1773

1986

logger.error("SO_BINDTODEVICE not available;"

1774

1987

" cannot bind to interface %s",

1775

1988

self.interface)

1989

elif error.errno == errno.ENODEV:

1990

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

1991

" cannot bind", self.interface)

1776

1992

else:

1777

1993

raise

1778

1994

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

1781

1997

if self.address_family == socket.AF_INET6:

1782

1998

any_address = "::" # in6addr_any

1783

1999

else:

1784

any_address = socket.INADDR_ANY

2000

any_address = "0.0.0.0" # INADDR_ANY

1785

2001

self.server_address = (any_address,

1786

2002

self.server_address[1])

1787

2003

elif not self.server_address[1]:

1808

2024

"""

1809

2025

def __init__(self, server_address, RequestHandlerClass,

1810

2026

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

1811

gnutls_priority=None, use_dbus=True):

2027

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

1812

2028

self.enabled = False

1813

2029

self.clients = clients

1814

2030

if self.clients is None:

1818

2034

IPv6_TCPServer.__init__(self, server_address,

1819

2035

RequestHandlerClass,

1820

2036

interface = interface,

1821

use_ipv6 = use_ipv6)

2037

use_ipv6 = use_ipv6,

2038

socketfd = socketfd)

1822

2039

def server_activate(self):

1823

2040

if self.enabled:

1824

2041

return socketserver.TCPServer.server_activate(self)

1837

2054

1838

2055

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

1839

2056

proc = None, client_object=None):

1840

condition_names = {

1841

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

1842

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

1843

# blocking).

1844

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

1845

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

1846

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

1847

# broken, usually for pipes and

1848

# sockets).

1849

}

1850

conditions_string = ' | '.join(name

1851

for cond, name in

1852

condition_names.iteritems()

1853

if cond & condition)

1854

2057

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

1855

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

2058

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

1856

2059

# Wait for other process to exit

1857

2060

proc.join()

1858

2061

return False

1916

2119

return True

1917

2120

1918

2121

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

1919

2221

def string_to_delta(interval):

1920

2222

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

1921

2223

1932

2234

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

1933

2235

datetime.timedelta(0, 330)

1934

2236

"""

2237

2238

try:

2239

return rfc3339_duration_to_delta(interval)

2240

except ValueError:

2241

pass

2242

1935

2243

timevalue = datetime.timedelta(0)

1936

2244

for s in interval.split():

1937

2245

try:

1948

2256

elif suffix == "w":

1949

2257

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

1950

2258

else:

1951

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

2259

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

2260

.format(suffix))

1952

2261

except (ValueError, IndexError) as e:

1953

2262

raise ValueError(*(e.args))

1954

2263

timevalue += delta

1968

2277

sys.exit()

1969

2278

if not noclose:

1970

2279

# Close all standard open file descriptors

1971

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

2280

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

1972

2281

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

1973

2282

raise OSError(errno.ENODEV,

1974

"%s not a character device"

1975

% os.path.devnull)

2283

"{0} not a character device"

2284

.format(os.devnull))

1976

2285

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

1977

2286

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

1978

2287

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

1987

2296

1988

2297

parser = argparse.ArgumentParser()

1989

2298

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

1990

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

2299

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

1991

2300

help="show version number and exit")

1992

2301

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

1993

2302

help="Bind to interface IF")

1999

2308

help="Run self-test")

2000

2309

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

2001

2310

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

2002

" to terminal")

2311

" to terminal", default=None)

2003

2312

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

2004

2313

help="Debug level for stdout output")

2005

2314

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

2012

2321

" files")

2013

2322

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

2014

2323

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

2015

" system bus interface")

2324

" system bus interface", default=None)

2016

2325

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

2017

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

2326

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

2327

default=None)

2018

2328

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

2019

2329

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

2020

" state")

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")

2021

2334

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

2022

2335

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

2336

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

2337

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

2023

2338

2024

2339

options = parser.parse_args()

2025

2340

2034

2349

"port": "",

2035

2350

"debug": "False",

2036

2351

"priority":

2037

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

2352

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

2038

2353

"servicename": "Mandos",

2039

2354

"use_dbus": "True",

2040

2355

"use_ipv6": "True",

2041

2356

"debuglevel": "",

2042

2357

"restore": "True",

2043

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

2358

"socket": "",

2359

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

2360

"foreground": "False",

2044

2361

}

2045

2362

2046

2363

# Parse config file for server-global settings

2051

2368

# Convert the SafeConfigParser object to a dict

2052

2369

server_settings = server_config.defaults()

2053

2370

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

2054

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

2371

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

2055

2372

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

2056

2373

option)

2057

2374

if server_settings["port"]:

2058

2375

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

2059

2376

"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"])

2060

2386

del server_config

2061

2387

2062

2388

# Override the settings from the config file with command line

2064

2390

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

2065

2391

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

2066

2392

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

2067

"statedir"):

2393

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

2068

2394

value = getattr(options, option)

2069

2395

if value is not None:

2070

2396

server_settings[option] = value

2073

2399

for option in server_settings.keys():

2074

2400

if type(server_settings[option]) is str:

2075

2401

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

2076

2409

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

2077

2410

2078

2411

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

2084

2417

use_ipv6 = server_settings["use_ipv6"]

2085

2418

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

2086

2419

stored_state_file)

2420

foreground = server_settings["foreground"]

2087

2421

2088

2422

if debug:

2089

2423

initlogger(debug, logging.DEBUG)

2096

2430

2097

2431

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

2098

2432

syslogger.setFormatter(logging.Formatter

2099

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

2100

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

2101

% server_settings["servicename"]))

2433

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

2434

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

2435

.format(server_settings

2436

["servicename"])))

2102

2437

2103

2438

# Parse config file with clients

2104

client_config = configparser.SafeConfigParser(Client.client_defaults)

2439

client_config = configparser.SafeConfigParser(Client

2440

.client_defaults)

2105

2441

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

2106

2442

"clients.conf"))

2107

2443

2116

2452

use_ipv6=use_ipv6,

2117

2453

gnutls_priority=

2118

2454

server_settings["priority"],

2119

use_dbus=use_dbus)

2120

if not debug:

2121

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

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

2122

2463

try:

2123

2464

pidfile = open(pidfilename, "w")

2124

except IOError:

2125

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

2465

except IOError as e:

2466

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

2467

exc_info=e)

2126

2468

2127

try:

2128

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

2129

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

2130

except KeyError:

2469

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

2131

2470

try:

2132

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

2133

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

2471

uid = pwd.getpwnam(name).pw_uid

2472

gid = pwd.getpwnam(name).pw_gid

2473

break

2134

2474

except KeyError:

2135

try:

2136

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

2137

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

2138

except KeyError:

2139

uid = 65534

2140

gid = 65534

2475

continue

2476

else:

2477

uid = 65534

2478

gid = 65534

2141

2479

try:

2142

2480

os.setgid(gid)

2143

2481

os.setuid(uid)

2144

2482

except OSError as error:

2145

if error[0] != errno.EPERM:

2483

if error.errno != errno.EPERM:

2146

2484

raise error

2147

2485

2148

2486

if debug:

2160

2498

.gnutls_global_set_log_function(debug_gnutls))

2161

2499

2162

2500

# Redirect stdin so all checkers get /dev/null

2163

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

2501

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

2164

2502

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

2165

2503

if null > 2:

2166

2504

os.close(null)

2167

2505

2168

2506

# Need to fork before connecting to D-Bus

2169

if not debug:

2507

if not foreground:

2170

2508

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

2171

2509

daemon()

2172

2510

2511

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

2512

# need to inform gobject that threads will be used.

2173

2513

gobject.threads_init()

2174

2514

2175

2515

global main_loop

2176

2516

# From the Avahi example code

2177

DBusGMainLoop(set_as_default=True )

2517

DBusGMainLoop(set_as_default=True)

2178

2518

main_loop = gobject.MainLoop()

2179

2519

bus = dbus.SystemBus()

2180

2520

# End of Avahi example code

2186

2526

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

2187

2527

do_not_queue=True))

2188

2528

except dbus.exceptions.NameExistsException as e:

2189

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

2529

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

2190

2530

use_dbus = False

2191

2531

server_settings["use_dbus"] = False

2192

2532

tcp_server.use_dbus = False

2204

2544

2205

2545

client_class = Client

2206

2546

if use_dbus:

2207

client_class = functools.partial(ClientDBusTransitional,

2208

bus = bus)

2547

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

2209

2548

2210

2549

client_settings = Client.config_parser(client_config)

2211

2550

old_client_settings = {}

2212

2551

clients_data = {}

2213

2552

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

2214

2561

# Get client data and settings from last running state.

2215

2562

if server_settings["restore"]:

2216

2563

try:

2219

2566

(stored_state))

2220

2567

os.remove(stored_state_path)

2221

2568

except IOError as e:

2222

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

2223

.format(e))

2224

if e.errno != errno.ENOENT:

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)

2225

2575

raise

2226

2576

except EOFError as e:

2227

2577

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

2228

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

2578

"EOFError:", exc_info=e)

2229

2579

2230

2580

with PGPEngine() as pgp:

2231

2581

for client_name, client in clients_data.iteritems():

2582

# Skip removed clients

2583

if client_name not in client_settings:

2584

continue

2585

2232

2586

# Decide which value to use after restoring saved state.

2233

2587

# We have three different values: Old config file,

2234

2588

# new config file, and saved state.

2248

2602

2249

2603

# Clients who has passed its expire date can still be

2250

2604

# enabled if its last checker was successful. Clients

2251

# whose checker failed before we stored its state is

2252

# assumed to have failed all checkers during downtime.

2605

# whose checker succeeded before we stored its state is

2606

# assumed to have successfully run all checkers during

2607

# downtime.

2253

2608

if client["enabled"]:

2254

2609

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

2255

2610

if not client["last_checked_ok"]:

2256

2611

logger.warning(

2257

2612

"disabling client {0} - Client never "

2258

"performed a successfull checker"

2259

.format(client["name"]))

2613

"performed a successful checker"

2614

.format(client_name))

2260

2615

client["enabled"] = False

2261

2616

elif client["last_checker_status"] != 0:

2262

2617

logger.warning(

2263

2618

"disabling client {0} - Client "

2264

2619

"last checker failed with error code {1}"

2265

.format(client["name"],

2620

.format(client_name,

2266

2621

client["last_checker_status"]))

2267

2622

client["enabled"] = False

2268

2623

else:

2271

2626

+ client["timeout"])

2272

2627

logger.debug("Last checker succeeded,"

2273

2628

" keeping {0} enabled"

2274

.format(client["name"]))

2629

.format(client_name))

2275

2630

try:

2276

2631

client["secret"] = (

2277

2632

pgp.decrypt(client["encrypted_secret"],

2283

2638

.format(client_name))

2284

2639

client["secret"] = (

2285

2640

client_settings[client_name]["secret"])

2286

2287

2641

2288

2642

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

2289

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

2643

for client_name in (set(old_client_settings)

2644

- set(client_settings)):

2290

2645

del clients_data[client_name]

2291

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

2646

for client_name in (set(client_settings)

2647

- set(old_client_settings)):

2292

2648

clients_data[client_name] = client_settings[client_name]

2293

2294

# Create clients all clients

2649

2650

# Create all client objects

2295

2651

for client_name, client in clients_data.iteritems():

2296

2652

tcp_server.clients[client_name] = client_class(

2297

name = client_name, settings = client)

2653

name = client_name, settings = client,

2654

server_settings = server_settings)

2298

2655

2299

2656

if not tcp_server.clients:

2300

2657

logger.warning("No clients defined")

2301

2302

if not debug:

2303

try:

2304

with pidfile:

2305

pid = os.getpid()

2306

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

2307

del pidfile

2308

except IOError:

2309

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

2310

pidfilename, pid)

2311

except NameError:

2312

# "pidfile" was never created

2313

pass

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

2314

2669

del pidfilename

2315

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

2316

2670

2317

2671

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

2318

2672

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

2319

2673

2320

2674

if use_dbus:

2321

class MandosDBusService(dbus.service.Object):

2675

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

2676

"se.bsnet.fukt.Mandos"})

2677

class MandosDBusService(DBusObjectWithProperties):

2322

2678

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

2323

2679

def __init__(self):

2324

2680

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

2325

2681

_interface = "se.recompile.Mandos"

2326

2682

2683

@dbus_interface_annotations(_interface)

2684

def _foo(self):

2685

return { "org.freedesktop.DBus.Property"

2686

".EmitsChangedSignal":

2687

"false"}

2688

2327

2689

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

2328

2690

def ClientAdded(self, objpath):

2329

2691

"D-Bus signal"

2371

2733

2372

2734

del _interface

2373

2735

2374

class MandosDBusServiceTransitional(MandosDBusService):

2375

__metaclass__ = AlternateDBusNamesMetaclass

2376

mandos_dbus_service = MandosDBusServiceTransitional()

2736

mandos_dbus_service = MandosDBusService()

2377

2737

2378

2738

def cleanup():

2379

2739

"Cleanup function; run on exit"

2380

2740

service.cleanup()

2381

2741

2382

2742

multiprocessing.active_children()

2743

wnull.close()

2383

2744

if not (tcp_server.clients or client_settings):

2384

2745

return

2385

2746

2397

2758

# A list of attributes that can not be pickled

2398

2759

# + secret.

2399

2760

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

2400

"checker"))

2761

"checker", "server_settings"))

2401

2762

for name, typ in (inspect.getmembers

2402

2763

(dbus.service.Object)):

2403

2764

exclude.add(name)

2412

2773

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

2413

2774

2414

2775

try:

2415

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

2416

prefix="clients-",

2417

dir=os.path.dirname

2418

(stored_state_path))

2419

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

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:

2420

2780

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

2781

tempname=stored_state.name

2421

2782

os.rename(tempname, stored_state_path)

2422

2783

except (IOError, OSError) as e:

2423

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

2424

.format(e))

2425

2784

if not debug:

2426

2785

try:

2427

2786

os.remove(tempname)

2428

2787

except NameError:

2429

2788

pass

2430

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

2431

errno.EEXIST)):

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)

2432

2795

raise e

2433

2796

2434

2797

# Delete all clients, and settings from config

2462

2825

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

2463

2826

if use_ipv6:

2464

2827

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

2465

" flowinfo %d, scope_id %d"

2466

% tcp_server.socket.getsockname())

2828

" flowinfo %d, scope_id %d",

2829

*tcp_server.socket.getsockname())

2467

2830

else: # IPv4

2468

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

2469

% tcp_server.socket.getsockname())

2831

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

2832

*tcp_server.socket.getsockname())

2470

2833

2471

2834

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

2472

2835

2475

2838

try:

2476

2839

service.activate()

2477

2840

except dbus.exceptions.DBusException as error:

2478

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

2841

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

2479

2842

cleanup()

2480

2843

sys.exit(1)

2481

2844

# End of Avahi example code

2488

2851

logger.debug("Starting main loop")

2489

2852

main_loop.run()

2490

2853

except AvahiError as error:

2491

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

2854

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

2492

2855

cleanup()

2493

2856

sys.exit(1)

2494

2857

except KeyboardInterrupt: