/mandos/trunk : revision 535

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.6.2"

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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class PGPEngine(object):

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"""A simple class for OpenPGP symmetric encryption & decryption"""

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet'])

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def __enter__(self):

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return self

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

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

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self._cleanup()

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return False

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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class AvahiError(Exception):

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

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self.value = value

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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

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

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% self.name))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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checker, or None.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"extended_timeout": "15m",

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"interval": "2m",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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

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.replace(" ", ""))

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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% section)

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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client["checker_command"] = section["checker"]

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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client["last_checker_status"] = None

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if client["enabled"]:

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

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

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+ client["timeout"])

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else:

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client["last_enabled"] = None

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client["expires"] = None

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return settings

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

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

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

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

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attribute."""

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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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

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datetime.datetime.utcnow())

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

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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

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# Already enabled

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return

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self.send_changedstate()

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

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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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()

572

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:

578

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()

613

583

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

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return False

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585

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def init_checker(self):

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

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# and every interval from then on.

622

if self.checker_initiator_tag is not None:

623

gobject.source_remove(self.checker_initiator_tag)

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592

self.checker_initiator_tag = (gobject.timeout_add

625

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(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)

630

596

self.disable_initiator_tag = (gobject.timeout_add

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597

(self.timeout_milliseconds(),

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self.disable))

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

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vars(self))

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def checked_ok(self):

655

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

656

self.last_checked_ok = datetime.datetime.utcnow()

657

self.last_checker_status = 0

658

self.bump_timeout()

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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):

621

"""Bump up the timeout for this client.

622

623

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

624

alive and well.

625

"""

662

626

if timeout is None:

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627

timeout = self.timeout

628

self.last_checked_ok = datetime.datetime.utcnow()

664

629

if self.disable_initiator_tag is not None:

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630

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

667

631

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

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632

self.disable_initiator_tag = (gobject.timeout_add

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633

(timedelta_to_milliseconds

679

643

If a checker already exists, leave it running and do

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644

nothing."""

681

645

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

682

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

683

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

684

# would inevitably timeout, since no checker would get a

685

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

646

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

647

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

648

# client would inevitably timeout, since no checker would get

649

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

686

650

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

687

651

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

688

652

# should be.

690

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

691

655

try:

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656

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

657

except (AttributeError, OSError) as error:

658

if (isinstance(error, OSError)

659

and error.errno != errno.ECHILD):

660

raise error

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661

else:

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662

if pid:

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663

logger.warning("Checker was a zombie")

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self.current_checker_command)

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# Start a new checker if needed

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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

669

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

670

# In case checker_command has exactly one % operator

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command = self.checker_command % self.host

672

except TypeError:

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# Escape attributes for the shell

674

escaped_attrs = dict(

675

(attr,

676

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

677

errors=

678

'replace')))

679

for attr in

680

self.runtime_expansions)

681

682

try:

683

command = self.checker_command % escaped_attrs

684

except TypeError as error:

685

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

686

' %s', self.checker_command, error)

687

return True # Try again later

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self.current_checker_command = command

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try:

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690

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

722

693

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

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694

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

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695

# 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 })

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self.checker = subprocess.Popen(command,

734

697

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

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(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:

698

shell=True, cwd="/")

699

self.checker_callback_tag = (gobject.child_watch_add

700

(self.checker.pid,

701

self.checker_callback,

702

data=command))

703

# The checker may have completed before the gobject

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# watch was added. Check for this.

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

706

if pid:

707

gobject.source_remove(self.checker_callback_tag)

708

self.checker_callback(pid, status, command)

749

709

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)

710

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

711

error)

759

712

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

760

713

return True

761

714

768

721

return

769

722

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

770

723

try:

771

self.checker.terminate()

724

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

772

725

#time.sleep(0.5)

773

726

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

774

# self.checker.kill()

727

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

775

728

except OSError as error:

776

729

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

777

730

raise

794

747

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

795

748

if byte_arrays and signature != "ay":

796

749

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

797

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

750

" signature %r" % signature)

798

751

def decorator(func):

799

752

func._dbus_is_property = True

800

753

func._dbus_interface = dbus_interface

808

761

return decorator

809

762

810

763

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

764

class DBusPropertyException(dbus.exceptions.DBusException):

849

765

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

850

766

"""

873

789

"""

874

790

875

791

@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)

792

def _is_dbus_property(obj):

793

return getattr(obj, "_dbus_is_property", False)

884

794

885

def _get_all_dbus_things(self, thing):

795

def _get_all_dbus_properties(self):

886

796

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

887

797

"""

888

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

889

name),

890

athing.__get__(self))

798

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

891

799

for cls in self.__class__.__mro__

892

for name, athing in

893

inspect.getmembers(cls,

894

self._is_dbus_thing(thing)))

800

for name, prop in

801

inspect.getmembers(cls, self._is_dbus_property))

895

802

896

803

def _get_dbus_property(self, interface_name, property_name):

897

804

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

899

806

"""

900

807

for cls in self.__class__.__mro__:

901

808

for name, value in (inspect.getmembers

902

(cls,

903

self._is_dbus_thing("property"))):

809

(cls, self._is_dbus_property)):

904

810

if (value._dbus_name == property_name

905

811

and value._dbus_interface == interface_name):

906

812

return value.__get__(self)

935

841

# signatures other than "ay".

936

842

if prop._dbus_signature != "ay":

937

843

raise ValueError

938

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

939

for byte in value))

844

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

845

for byte in value))

940

846

prop(value)

941

847

942

848

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

948

854

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

949

855

"""

950

856

properties = {}

951

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

857

for name, prop in self._get_all_dbus_properties():

952

858

if (interface_name

953

859

and interface_name != prop._dbus_interface):

954

860

# Interface non-empty but did not match

969

875

path_keyword='object_path',

970

876

connection_keyword='connection')

971

877

def Introspect(self, object_path, connection):

972

"""Overloading of standard D-Bus method.

973

974

Inserts property tags and interface annotation tags.

878

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

975

879

"""

976

880

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

977

881

connection)

984

888

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

985

889

return e

986

890

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

987

# Add property tags

988

891

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

989

892

for name, prop

990

in self._get_all_dbus_things("property")

893

in self._get_all_dbus_properties()

991

894

if prop._dbus_interface

992

895

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

993

896

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

897

# Add the names to the return values for the

1026

898

# "org.freedesktop.DBus.Properties" methods

1027

899

if (if_tag.getAttribute("name")

1042

914

except (AttributeError, xml.dom.DOMException,

1043

915

xml.parsers.expat.ExpatError) as error:

1044

916

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

1045

exc_info=error)

917

error)

1046

918

return xmlstring

1047

919

1048

920

1049

def datetime_to_dbus(dt, variant_level=0):

921

def datetime_to_dbus (dt, variant_level=0):

1050

922

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

1051

923

if dt is None:

1052

924

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

1054

926

variant_level=variant_level)

1055

927

1056

928

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).

929

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

930

.__metaclass__):

931

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

932

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

1079

933

"""

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):

934

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

935

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

936

# methods, signals, or properties in them

937

for base in (b for b in bases

938

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

939

# Go though all attributes of the base class

940

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

1087

941

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

1088

942

# with the wrong interface name

1089

943

if (not hasattr(attribute, "_dbus_interface")

1090

944

or not attribute._dbus_interface

1091

.startswith(orig_interface_name)):

945

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

1092

946

continue

1093

947

# Create an alternate D-Bus interface name based on

1094

948

# the current name

1095

949

alt_interface = (attribute._dbus_interface

1096

.replace(orig_interface_name,

1097

alt_interface_name))

1098

interface_names.add(alt_interface)

950

.replace("se.recompile.Mandos",

951

"se.bsnet.fukt.Mandos"))

1099

952

# Is this a D-Bus signal?

1100

953

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

1101

# Extract the original non-method undecorated

1102

# function by black magic

954

# Extract the original non-method function by

955

# black magic

1103

956

nonmethod_func = (dict(

1104

957

zip(attribute.func_code.co_freevars,

1105

958

attribute.__closure__))["func"]

1116

969

nonmethod_func.func_name,

1117

970

nonmethod_func.func_defaults,

1118

971

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

972

# 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

973

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

974

# signals gets sent when the function is called

1129

975

def fixscope(func1, func2):

1130

976

"""This function is a scope container to pass

1131

977

func1 and func2 to the "call_both" function

1138

984

return call_both

1139

985

# Create the "call_both" function and add it to

1140

986

# the class

1141

attr[attrname] = fixscope(attribute, new_function)

987

attr[attrname] = fixscope(attribute,

988

new_function)

1142

989

# Is this a D-Bus method?

1143

990

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

1144

991

# Create a new, but exactly alike, function

1155

1002

attribute.func_name,

1156

1003

attribute.func_defaults,

1157

1004

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

1005

# Is this a D-Bus property?

1165

1006

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

1166

1007

# Create a new, but exactly alike, function

1180

1021

attribute.func_name,

1181

1022

attribute.func_defaults,

1182

1023

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"})

1024

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

1025

1026

1228

1027

class ClientDBus(Client, DBusObjectWithProperties):

1229

1028

"""A Client class using D-Bus

1230

1029

1241

1040

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

1242

1041

self.bus = bus

1243

1042

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

1043

self._approvals_pending = 0

1044

1045

self._approvals_pending = 0

1244

1046

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

1245

1047

# the D-Bus

1246

1048

client_object_name = unicode(self.name).translate(

1250

1052

("/clients/" + client_object_name))

1251

1053

DBusObjectWithProperties.__init__(self, self.bus,

1252

1054

self.dbus_object_path)

1253

1055

1254

1056

def notifychangeproperty(transform_func,

1255

1057

dbus_name, type_func=lambda x: x,

1256

1058

variant_level=1):

1279

1081

1280

1082

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

1281

1083

1084

1282

1085

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1283

1086

approvals_pending = notifychangeproperty(dbus.Boolean,

1284

1087

"ApprovalPending",

1291

1094

checker is not None)

1292

1095

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1293

1096

"LastCheckedOK")

1294

last_checker_status = notifychangeproperty(dbus.Int16,

1295

"LastCheckerStatus")

1296

1097

last_approval_request = notifychangeproperty(

1297

1098

datetime_to_dbus, "LastApprovalRequest")

1298

1099

approved_by_default = notifychangeproperty(dbus.Boolean,

1366

1167

return False

1367

1168

1368

1169

def approve(self, value=True):

1170

self.send_changedstate()

1369

1171

self.approved = value

1370

1172

gobject.timeout_add(timedelta_to_milliseconds

1371

1173

(self.approval_duration),

1372

1174

self._reset_approved)

1373

self.send_changedstate()

1175

1374

1176

1375

1177

## D-Bus methods, signals & properties

1376

1178

_interface = "se.recompile.Mandos.Client"

1377

1179

1378

## Interfaces

1379

1380

@dbus_interface_annotations(_interface)

1381

def _foo(self):

1382

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

1383

"false"}

1384

1385

1180

## Signals

1386

1181

1387

1182

# CheckerCompleted - signal

1423

1218

"D-Bus signal"

1424

1219

return self.need_approval()

1425

1220

1221

# NeRwequest - signal

1222

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

1223

def NewRequest(self, ip):

1224

"""D-Bus signal

1225

Is sent after a client request a password.

1226

"""

1227

pass

1228

1426

1229

## Methods

1427

1230

1428

1231

# Approve - method

1538

1341

return

1539

1342

return datetime_to_dbus(self.last_checked_ok)

1540

1343

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

1344

# Expires - property

1548

1345

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

1549

1346

def Expires_dbus_property(self):

1560

1357

def Timeout_dbus_property(self, value=None):

1561

1358

if value is None: # get

1562

1359

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1564

1360

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

1565

# Reschedule disabling

1566

if self.enabled:

1567

now = datetime.datetime.utcnow()

1568

self.expires += self.timeout - old_timeout

1569

if self.expires <= now:

1570

# The timeout has passed

1571

self.disable()

1572

else:

1573

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

1574

is None):

1575

return

1576

gobject.source_remove(self.disable_initiator_tag)

1577

self.disable_initiator_tag = (

1578

gobject.timeout_add(

1579

timedelta_to_milliseconds(self.expires - now),

1580

self.disable))

1361

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

1362

return

1363

# Reschedule timeout

1364

gobject.source_remove(self.disable_initiator_tag)

1365

self.disable_initiator_tag = None

1366

self.expires = None

1367

time_to_die = timedelta_to_milliseconds((self

1368

.last_checked_ok

1369

+ self.timeout)

1370

- datetime.datetime

1371

.utcnow())

1372

if time_to_die <= 0:

1373

# The timeout has passed

1374

self.disable()

1375

else:

1376

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

1377

+ datetime.timedelta(milliseconds =

1378

time_to_die))

1379

self.disable_initiator_tag = (gobject.timeout_add

1380

(time_to_die, self.disable))

1581

1381

1582

1382

# ExtendedTimeout - property

1583

1383

@dbus_service_property(_interface, signature="t",

1662

1462

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

1663

1463

1664

1464

1465

class ClientDBusTransitional(ClientDBus):

1466

__metaclass__ = AlternateDBusNamesMetaclass

1467

1468

1665

1469

class ClientHandler(socketserver.BaseRequestHandler, object):

1666

1470

"""A class to handle client connections.

1667

1471

1703

1507

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

1704

1508

try:

1705

1509

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

1706

raise RuntimeError(line)

1510

raise RuntimeError

1707

1511

except (ValueError, IndexError, RuntimeError) as error:

1708

1512

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

1709

1513

return

1735

1539

except KeyError:

1736

1540

return

1737

1541

1542

if self.server.use_dbus:

1543

# Emit D-Bus signal

1544

client.NewRequest(str(self.client_address))

1545

1738

1546

if client.approval_delay:

1739

1547

delay = client.approval_delay

1740

1548

client.approvals_pending += 1

1771

1579

#wait until timeout or approved

1772

1580

time = datetime.datetime.now()

1773

1581

client.changedstate.acquire()

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1582

(client.changedstate.wait

1583

(float(client.timedelta_to_milliseconds(delay)

1584

/ 1000)))

1777

1585

client.changedstate.release()

1778

1586

time2 = datetime.datetime.now()

1779

1587

if (time2 - time) >= delay:

1795

1603

try:

1796

1604

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

1797

1605

except gnutls.errors.GNUTLSError as error:

1798

logger.warning("gnutls send failed",

1799

exc_info=error)

1606

logger.warning("gnutls send failed")

1800

1607

return

1801

1608

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

1802

1609

sent, len(client.secret)

1805

1612

1806

1613

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

1807

1614

# bump the timeout using extended_timeout

1808

client.bump_timeout(client.extended_timeout)

1615

client.checked_ok(client.extended_timeout)

1809

1616

if self.server.use_dbus:

1810

1617

# Emit D-Bus signal

1811

1618

client.GotSecret()

1816

1623

try:

1817

1624

session.bye()

1818

1625

except gnutls.errors.GNUTLSError as error:

1819

logger.warning("GnuTLS bye failed",

1820

exc_info=error)

1626

logger.warning("GnuTLS bye failed")

1821

1627

1822

1628

@staticmethod

1823

1629

def peer_certificate(session):

1895

1701

def process_request(self, request, address):

1896

1702

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

1897

1703

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

1898

args = (request, address))

1704

args = (request,

1705

address))

1899

1706

proc.start()

1900

1707

return proc

1901

1708

1916

1723

1917

1724

def add_pipe(self, parent_pipe, proc):

1918

1725

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

1919

raise NotImplementedError()

1726

raise NotImplementedError

1920

1727

1921

1728

1922

1729

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1929

1736

use_ipv6: Boolean; to use IPv6 or not

1930

1737

"""

1931

1738

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

"""

1739

interface=None, use_ipv6=True):

1936

1740

self.interface = interface

1937

1741

if use_ipv6:

1938

1742

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

1743

socketserver.TCPServer.__init__(self, server_address,

1966

1744

RequestHandlerClass)

1967

1968

1745

def server_bind(self):

1969

1746

"""This overrides the normal server_bind() function

1970

1747

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

1978

1755

try:

1979

1756

self.socket.setsockopt(socket.SOL_SOCKET,

1980

1757

SO_BINDTODEVICE,

1981

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

1758

str(self.interface

1759

+ '\0'))

1982

1760

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:

1761

if error[0] == errno.EPERM:

1762

logger.error("No permission to"

1763

" bind to interface %s",

1764

self.interface)

1765

elif error[0] == errno.ENOPROTOOPT:

1987

1766

logger.error("SO_BINDTODEVICE not available;"

1988

1767

" cannot bind to interface %s",

1989

1768

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

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

1992

" cannot bind", self.interface)

1993

1769

else:

1994

1770

raise

1995

1771

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

1998

1774

if self.address_family == socket.AF_INET6:

1999

1775

any_address = "::" # in6addr_any

2000

1776

else:

2001

any_address = "0.0.0.0" # INADDR_ANY

1777

any_address = socket.INADDR_ANY

2002

1778

self.server_address = (any_address,

2003

1779

self.server_address[1])

2004

1780

elif not self.server_address[1]:

2025

1801

"""

2026

1802

def __init__(self, server_address, RequestHandlerClass,

2027

1803

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

2028

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

1804

gnutls_priority=None, use_dbus=True):

2029

1805

self.enabled = False

2030

1806

self.clients = clients

2031

1807

if self.clients is None:

2035

1811

IPv6_TCPServer.__init__(self, server_address,

2036

1812

RequestHandlerClass,

2037

1813

interface = interface,

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1814

use_ipv6 = use_ipv6)

2040

1815

def server_activate(self):

2041

1816

if self.enabled:

2042

1817

return socketserver.TCPServer.server_activate(self)

2055

1830

2056

1831

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

2057

1832

proc = None, client_object=None):

1833

condition_names = {

1834

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

1835

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

1836

# blocking).

1837

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

1838

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

1839

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

1840

# broken, usually for pipes and

1841

# sockets).

1842

}

1843

conditions_string = ' | '.join(name

1844

for cond, name in

1845

condition_names.iteritems()

1846

if cond & condition)

2058

1847

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

2059

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

1848

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

2060

1849

# Wait for other process to exit

2061

1850

proc.join()

2062

1851

return False

2120

1909

return True

2121

1910

2122

1911

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

1912

def string_to_delta(interval):

2223

1913

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

2224

1914

2235

1925

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

2236

1926

datetime.timedelta(0, 330)

2237

1927

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

2244

1928

timevalue = datetime.timedelta(0)

2245

1929

for s in interval.split():

2246

1930

try:

2257

1941

elif suffix == "w":

2258

1942

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

2259

1943

else:

2260

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

2261

.format(suffix))

2262

except IndexError as e:

1944

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

1945

except (ValueError, IndexError) as e:

2263

1946

raise ValueError(*(e.args))

2264

1947

timevalue += delta

2265

1948

return timevalue

2278

1961

sys.exit()

2279

1962

if not noclose:

2280

1963

# Close all standard open file descriptors

2281

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

1964

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

2282

1965

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

2283

1966

raise OSError(errno.ENODEV,

2284

"{0} not a character device"

2285

.format(os.devnull))

1967

"%s not a character device"

1968

% os.path.devnull)

2286

1969

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

2287

1970

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

2288

1971

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

2297

1980

2298

1981

parser = argparse.ArgumentParser()

2299

1982

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

2300

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

1983

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

2301

1984

help="show version number and exit")

2302

1985

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

2303

1986

help="Bind to interface IF")

2309

1992

help="Run self-test")

2310

1993

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

2311

1994

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

2312

" to terminal", default=None)

1995

" to terminal")

2313

1996

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

2314

1997

help="Debug level for stdout output")

2315

1998

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

2322

2005

" files")

2323

2006

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

2324

2007

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

2325

" system bus interface", default=None)

2008

" system bus interface")

2326

2009

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

2327

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

2328

default=None)

2010

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

2329

2011

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

2330

2012

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")

2013

" state")

2335

2014

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

2336

2015

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

2337

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

2338

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

2339

2016

2340

2017

options = parser.parse_args()

2341

2018

2350

2027

"port": "",

2351

2028

"debug": "False",

2352

2029

"priority":

2353

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

2030

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

2354

2031

"servicename": "Mandos",

2355

2032

"use_dbus": "True",

2356

2033

"use_ipv6": "True",

2357

2034

"debuglevel": "",

2358

2035

"restore": "True",

2359

"socket": "",

2360

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

2361

"foreground": "False",

2036

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

2362

2037

}

2363

2038

2364

2039

# Parse config file for server-global settings

2369

2044

# Convert the SafeConfigParser object to a dict

2370

2045

server_settings = server_config.defaults()

2371

2046

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

2372

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

2047

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

2373

2048

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

2374

2049

option)

2375

2050

if server_settings["port"]:

2376

2051

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

2377

2052

"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

2053

del server_config

2388

2054

2389

2055

# Override the settings from the config file with command line

2391

2057

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

2392

2058

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

2393

2059

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

2394

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

2060

"statedir"):

2395

2061

value = getattr(options, option)

2396

2062

if value is not None:

2397

2063

server_settings[option] = value

2400

2066

for option in server_settings.keys():

2401

2067

if type(server_settings[option]) is str:

2402

2068

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

2069

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

2411

2070

2412

2071

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

2418

2077

use_ipv6 = server_settings["use_ipv6"]

2419

2078

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

2420

2079

stored_state_file)

2421

foreground = server_settings["foreground"]

2422

2080

2423

2081

if debug:

2424

2082

initlogger(debug, logging.DEBUG)

2431

2089

2432

2090

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

2433

2091

syslogger.setFormatter(logging.Formatter

2434

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

2435

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

2436

.format(server_settings

2437

["servicename"])))

2092

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

2093

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

2094

% server_settings["servicename"]))

2438

2095

2439

2096

# Parse config file with clients

2440

client_config = configparser.SafeConfigParser(Client

2441

.client_defaults)

2097

client_config = configparser.SafeConfigParser(Client.client_defaults)

2442

2098

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

2443

2099

"clients.conf"))

2444

2100

2453

2109

use_ipv6=use_ipv6,

2454

2110

gnutls_priority=

2455

2111

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

2112

use_dbus=use_dbus)

2113

if not debug:

2114

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

2464

2115

try:

2465

2116

pidfile = open(pidfilename, "w")

2466

except IOError as e:

2467

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

2468

exc_info=e)

2117

except IOError:

2118

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

2469

2119

2470

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

2120

try:

2121

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

2122

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

2123

except KeyError:

2471

2124

try:

2472

uid = pwd.getpwnam(name).pw_uid

2473

gid = pwd.getpwnam(name).pw_gid

2474

break

2125

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

2126

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

2475

2127

except KeyError:

2476

continue

2477

else:

2478

uid = 65534

2479

gid = 65534

2128

try:

2129

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

2130

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

2131

except KeyError:

2132

uid = 65534

2133

gid = 65534

2480

2134

try:

2481

2135

os.setgid(gid)

2482

2136

os.setuid(uid)

2483

2137

except OSError as error:

2484

if error.errno != errno.EPERM:

2485

raise

2138

if error[0] != errno.EPERM:

2139

raise error

2486

2140

2487

2141

if debug:

2488

2142

# Enable all possible GnuTLS debugging

2499

2153

.gnutls_global_set_log_function(debug_gnutls))

2500

2154

2501

2155

# Redirect stdin so all checkers get /dev/null

2502

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

2156

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

2503

2157

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

2504

2158

if null > 2:

2505

2159

os.close(null)

2506

2160

2507

2161

# Need to fork before connecting to D-Bus

2508

if not foreground:

2162

if not debug:

2509

2163

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

2510

2164

daemon()

2511

2165

2512

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

2513

# need to inform gobject that threads will be used.

2514

2166

gobject.threads_init()

2515

2167

2516

2168

global main_loop

2517

2169

# From the Avahi example code

2518

DBusGMainLoop(set_as_default=True)

2170

DBusGMainLoop(set_as_default=True )

2519

2171

main_loop = gobject.MainLoop()

2520

2172

bus = dbus.SystemBus()

2521

2173

# End of Avahi example code

2527

2179

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

2528

2180

do_not_queue=True))

2529

2181

except dbus.exceptions.NameExistsException as e:

2530

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

2182

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

2531

2183

use_dbus = False

2532

2184

server_settings["use_dbus"] = False

2533

2185

tcp_server.use_dbus = False

2545

2197

2546

2198

client_class = Client

2547

2199

if use_dbus:

2548

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

2200

client_class = functools.partial(ClientDBusTransitional,

2201

bus = bus)

2549

2202

2550

2203

client_settings = Client.config_parser(client_config)

2551

2204

old_client_settings = {}

2552

2205

clients_data = {}

2553

2206

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

2207

# Get client data and settings from last running state.

2563

2208

if server_settings["restore"]:

2564

2209

try:

2567

2212

(stored_state))

2568

2213

os.remove(stored_state_path)

2569

2214

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)

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2576

2218

raise

2577

2219

except EOFError as e:

2578

2220

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

2579

"EOFError:", exc_info=e)

2221

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

2580

2222

2581

2223

with PGPEngine() as pgp:

2582

2224

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2587

2225

# Decide which value to use after restoring saved state.

2588

2226

# We have three different values: Old config file,

2589

2227

# new config file, and saved state.

2603

2241

2604

2242

# Clients who has passed its expire date can still be

2605

2243

# 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.

2244

# whose checker failed before we stored its state is

2245

# assumed to have failed all checkers during downtime.

2609

2246

if client["enabled"]:

2610

2247

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

2611

2248

if not client["last_checked_ok"]:

2612

2249

logger.warning(

2613

2250

"disabling client {0} - Client never "

2614

"performed a successful checker"

2615

.format(client_name))

2251

"performed a successfull checker"

2252

.format(client["name"]))

2616

2253

client["enabled"] = False

2617

2254

elif client["last_checker_status"] != 0:

2618

2255

logger.warning(

2619

2256

"disabling client {0} - Client "

2620

2257

"last checker failed with error code {1}"

2621

.format(client_name,

2258

.format(client["name"],

2622

2259

client["last_checker_status"]))

2623

2260

client["enabled"] = False

2624

2261

else:

2625

2262

client["expires"] = (datetime.datetime

2626

2263

.utcnow()

2627

2264

+ client["timeout"])

2628

logger.debug("Last checker succeeded,"

2629

" keeping {0} enabled"

2630

.format(client_name))

2265

2631

2266

try:

2632

2267

client["secret"] = (

2633

2268

pgp.decrypt(client["encrypted_secret"],

2639

2274

.format(client_name))

2640

2275

client["secret"] = (

2641

2276

client_settings[client_name]["secret"])

2277

2642

2278

2643

2279

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

2644

for client_name in (set(old_client_settings)

2645

- set(client_settings)):

2280

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

2646

2281

del clients_data[client_name]

2647

for client_name in (set(client_settings)

2648

- set(old_client_settings)):

2282

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

2649

2283

clients_data[client_name] = client_settings[client_name]

2650

2651

# Create all client objects

2284

2285

# Create clients all clients

2652

2286

for client_name, client in clients_data.iteritems():

2653

2287

tcp_server.clients[client_name] = client_class(

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2288

name = client_name, settings = client)

2656

2289

2657

2290

if not tcp_server.clients:

2658

2291

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

2292

2293

if not debug:

2294

try:

2295

with pidfile:

2296

pid = os.getpid()

2297

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

2298

del pidfile

2299

except IOError:

2300

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

2301

pidfilename, pid)

2302

except NameError:

2303

# "pidfile" was never created

2304

pass

2670

2305

del pidfilename

2306

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

2671

2307

2672

2308

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

2673

2309

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

2674

2310

2675

2311

if use_dbus:

2676

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

2677

"se.bsnet.fukt.Mandos"})

2678

class MandosDBusService(DBusObjectWithProperties):

2312

class MandosDBusService(dbus.service.Object):

2679

2313

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

2680

2314

def __init__(self):

2681

2315

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

2682

2316

_interface = "se.recompile.Mandos"

2683

2317

2684

@dbus_interface_annotations(_interface)

2685

def _foo(self):

2686

return { "org.freedesktop.DBus.Property"

2687

".EmitsChangedSignal":

2688

"false"}

2689

2690

2318

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

2691

2319

def ClientAdded(self, objpath):

2692

2320

"D-Bus signal"

2734

2362

2735

2363

del _interface

2736

2364

2737

mandos_dbus_service = MandosDBusService()

2365

class MandosDBusServiceTransitional(MandosDBusService):

2366

__metaclass__ = AlternateDBusNamesMetaclass

2367

mandos_dbus_service = MandosDBusServiceTransitional()

2738

2368

2739

2369

def cleanup():

2740

2370

"Cleanup function; run on exit"

2741

2371

service.cleanup()

2742

2372

2743

2373

multiprocessing.active_children()

2744

wnull.close()

2745

2374

if not (tcp_server.clients or client_settings):

2746

2375

return

2747

2376

2759

2388

# A list of attributes that can not be pickled

2760

2389

# + secret.

2761

2390

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

2762

"checker", "server_settings"))

2391

"checker"))

2763

2392

for name, typ in (inspect.getmembers

2764

2393

(dbus.service.Object)):

2765

2394

exclude.add(name)

2774

2403

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

2775

2404

2776

2405

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:

2406

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

2407

prefix="clients-",

2408

dir=os.path.dirname

2409

(stored_state_path))

2410

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

2781

2411

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

2782

tempname=stored_state.name

2783

2412

os.rename(tempname, stored_state_path)

2784

2413

except (IOError, OSError) as e:

2414

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

2415

.format(e))

2785

2416

if not debug:

2786

2417

try:

2787

2418

os.remove(tempname)

2788

2419

except NameError:

2789

2420

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

2421

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

2422

errno.EEXIST)):

2423

raise e

2797

2424

2798

2425

# Delete all clients, and settings from config

2799

2426

while tcp_server.clients:

2826

2453

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

2827

2454

if use_ipv6:

2828

2455

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

2829

" flowinfo %d, scope_id %d",

2830

*tcp_server.socket.getsockname())

2456

" flowinfo %d, scope_id %d"

2457

% tcp_server.socket.getsockname())

2831

2458

else: # IPv4

2832

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

2833

*tcp_server.socket.getsockname())

2459

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

2460

% tcp_server.socket.getsockname())

2834

2461

2835

2462

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

2836

2463

2839

2466

try:

2840

2467

service.activate()

2841

2468

except dbus.exceptions.DBusException as error:

2842

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

2469

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

2843

2470

cleanup()

2844

2471

sys.exit(1)

2845

2472

# End of Avahi example code

2852

2479

logger.debug("Starting main loop")

2853

2480

main_loop.run()

2854

2481

except AvahiError as error:

2855

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

2482

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

2856

2483

cleanup()

2857

2484

sys.exit(1)

2858

2485

except KeyboardInterrupt: