/mandos/trunk : revision 650

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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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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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"""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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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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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, "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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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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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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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", 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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595

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

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if not quiet:

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self.send_changedstate()

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if not quiet:

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

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if getattr(self, "disable_initiator_tag", 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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self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

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if not quiet:

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self.send_changedstate()

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

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return False

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615

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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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621

# and every interval from then on.

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if self.checker_initiator_tag is not None:

623

gobject.source_remove(self.checker_initiator_tag)

592

624

self.checker_initiator_tag = (gobject.timeout_add

593

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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630

self.disable_initiator_tag = (gobject.timeout_add

597

631

(self.timeout_milliseconds(),

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632

self.disable))

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651

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

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652

vars(self))

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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

"""

654

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):

661

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

626

662

if timeout is None:

627

663

timeout = self.timeout

628

self.last_checked_ok = datetime.datetime.utcnow()

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664

if self.disable_initiator_tag is not None:

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665

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

631

667

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

632

668

self.disable_initiator_tag = (gobject.timeout_add

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669

(timedelta_to_milliseconds

643

679

If a checker already exists, leave it running and do

644

680

nothing."""

645

681

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

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

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

650

686

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

651

687

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

652

688

# should be.

654

690

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

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691

try:

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

657

except (AttributeError, OSError) as error:

658

if (isinstance(error, OSError)

659

and error.errno != errno.ECHILD):

660

raise error

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

661

698

else:

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699

if pid:

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700

logger.warning("Checker was a zombie")

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703

self.current_checker_command)

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# Start a new checker if needed

668

705

if self.checker is None:

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# 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)

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711

try:

670

# In case checker_command has exactly one % operator

671

command = self.checker_command % self.host

672

except TypeError:

673

# Escape attributes for the shell

674

escaped_attrs = dict(

675

(attr,

676

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

677

errors=

678

'replace')))

679

for attr in

680

self.runtime_expansions)

681

682

try:

683

command = self.checker_command % escaped_attrs

684

except TypeError as error:

685

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

686

' %s', self.checker_command, error)

687

return True # Try again later

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

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self.current_checker_command = command

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718

try:

690

719

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

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722

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

694

723

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

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724

# 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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733

self.checker = subprocess.Popen(command,

697

734

close_fds=True,

698

shell=True, cwd="/")

699

self.checker_callback_tag = (gobject.child_watch_add

700

(self.checker.pid,

701

self.checker_callback,

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data=command))

703

# The checker may have completed before the gobject

704

# watch was added. Check for this.

735

shell=True, cwd="/",

736

**popen_args)

737

except OSError as error:

738

logger.error("Failed to start subprocess",

739

exc_info=error)

740

return True

741

self.checker_callback_tag = (gobject.child_watch_add

742

(self.checker.pid,

743

self.checker_callback,

744

data=command))

745

# The checker may have completed before the gobject

746

# watch was added. Check for this.

747

try:

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748

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)

709

749

except OSError as error:

710

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

711

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)

712

759

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

713

760

return True

714

761

721

768

return

722

769

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

723

770

try:

724

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

771

self.checker.terminate()

725

772

#time.sleep(0.5)

726

773

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

727

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

774

# self.checker.kill()

728

775

except OSError as error:

729

776

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

730

777

raise

747

794

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

748

795

if byte_arrays and signature != "ay":

749

796

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

750

" signature %r" % signature)

797

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

751

798

def decorator(func):

752

799

func._dbus_is_property = True

753

800

func._dbus_interface = dbus_interface

761

808

return decorator

762

809

763

810

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

764

848

class DBusPropertyException(dbus.exceptions.DBusException):

765

849

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

766

850

"""

789

873

"""

790

874

791

875

@staticmethod

792

def _is_dbus_property(obj):

793

return getattr(obj, "_dbus_is_property", False)

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)

794

884

795

def _get_all_dbus_properties(self):

885

def _get_all_dbus_things(self, thing):

796

886

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

797

887

"""

798

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

888

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

889

name),

890

athing.__get__(self))

799

891

for cls in self.__class__.__mro__

800

for name, prop in

801

inspect.getmembers(cls, self._is_dbus_property))

892

for name, athing in

893

inspect.getmembers(cls,

894

self._is_dbus_thing(thing)))

802

895

803

896

def _get_dbus_property(self, interface_name, property_name):

804

897

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

806

899

"""

807

900

for cls in self.__class__.__mro__:

808

901

for name, value in (inspect.getmembers

809

(cls, self._is_dbus_property)):

902

(cls,

903

self._is_dbus_thing("property"))):

810

904

if (value._dbus_name == property_name

811

905

and value._dbus_interface == interface_name):

812

906

return value.__get__(self)

840

934

# The byte_arrays option is not supported yet on

841

935

# signatures other than "ay".

842

936

if prop._dbus_signature != "ay":

843

raise ValueError

844

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

845

for byte in value))

937

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

938

"'ay' signature {0!r}"

939

.format(prop._dbus_signature))

940

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

941

for byte in value))

846

942

prop(value)

847

943

848

944

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

854

950

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

855

951

"""

856

952

properties = {}

857

for name, prop in self._get_all_dbus_properties():

953

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

858

954

if (interface_name

859

955

and interface_name != prop._dbus_interface):

860

956

# Interface non-empty but did not match

875

971

path_keyword='object_path',

876

972

connection_keyword='connection')

877

973

def Introspect(self, object_path, connection):

878

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

974

"""Overloading of standard D-Bus method.

975

976

Inserts property tags and interface annotation tags.

879

977

"""

880

978

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

881

979

connection)

888

986

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

889

987

return e

890

988

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

989

# Add property tags

891

990

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

892

991

for name, prop

893

in self._get_all_dbus_properties()

992

in self._get_all_dbus_things("property")

894

993

if prop._dbus_interface

895

994

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

896

995

if_tag.appendChild(tag)

996

# Add annotation tags

997

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

998

for tag in if_tag.getElementsByTagName(typ):

999

annots = dict()

1000

for name, prop in (self.

1001

_get_all_dbus_things(typ)):

1002

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

1003

and prop._dbus_interface

1004

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

1005

annots.update(getattr

1006

(prop,

1007

"_dbus_annotations",

1008

{}))

1009

for name, value in annots.iteritems():

1010

ann_tag = document.createElement(

1011

"annotation")

1012

ann_tag.setAttribute("name", name)

1013

ann_tag.setAttribute("value", value)

1014

tag.appendChild(ann_tag)

1015

# Add interface annotation tags

1016

for annotation, value in dict(

1017

itertools.chain.from_iterable(

1018

annotations().iteritems()

1019

for name, annotations in

1020

self._get_all_dbus_things("interface")

1021

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

1022

)).iteritems():

1023

ann_tag = document.createElement("annotation")

1024

ann_tag.setAttribute("name", annotation)

1025

ann_tag.setAttribute("value", value)

1026

if_tag.appendChild(ann_tag)

897

1027

# Add the names to the return values for the

898

1028

# "org.freedesktop.DBus.Properties" methods

899

1029

if (if_tag.getAttribute("name")

914

1044

except (AttributeError, xml.dom.DOMException,

915

1045

xml.parsers.expat.ExpatError) as error:

916

1046

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

917

error)

1047

exc_info=error)

918

1048

return xmlstring

919

1049

920

1050

921

def datetime_to_dbus (dt, variant_level=0):

1051

def datetime_to_dbus(dt, variant_level=0):

922

1052

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

923

1053

if dt is None:

924

1054

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

926

1056

variant_level=variant_level)

927

1057

928

1058

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.

1059

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1060

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

1061

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

1062

interface names according to the "alt_interface_names" mapping.

1063

Usage:

1064

1065

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

1066

"net.example.AlternateInterface"})

1067

class SampleDBusObject(dbus.service.Object):

1068

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

1069

def SampleDBusMethod():

1070

pass

1071

1072

The above "SampleDBusMethod" on "SampleDBusObject" will be

1073

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

1074

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

1075

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

1076

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

1077

1078

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

1079

(from DBusObjectWithProperties) and interfaces (from the

1080

dbus_interface_annotations decorator).

933

1081

"""

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):

1082

def wrapper(cls):

1083

for orig_interface_name, alt_interface_name in (

1084

alt_interface_names.iteritems()):

1085

attr = {}

1086

interface_names = set()

1087

# Go though all attributes of the class

1088

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

941

1089

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

942

1090

# with the wrong interface name

943

1091

if (not hasattr(attribute, "_dbus_interface")

944

1092

or not attribute._dbus_interface

945

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

1093

.startswith(orig_interface_name)):

946

1094

continue

947

1095

# Create an alternate D-Bus interface name based on

948

1096

# the current name

949

1097

alt_interface = (attribute._dbus_interface

950

.replace("se.recompile.Mandos",

951

"se.bsnet.fukt.Mandos"))

1098

.replace(orig_interface_name,

1099

alt_interface_name))

1100

interface_names.add(alt_interface)

952

1101

# Is this a D-Bus signal?

953

1102

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

954

# Extract the original non-method function by

955

# black magic

1103

# Extract the original non-method undecorated

1104

# function by black magic

956

1105

nonmethod_func = (dict(

957

1106

zip(attribute.func_code.co_freevars,

958

1107

attribute.__closure__))["func"]

969

1118

nonmethod_func.func_name,

970

1119

nonmethod_func.func_defaults,

971

1120

nonmethod_func.func_closure)))

1121

# Copy annotations, if any

1122

try:

1123

new_function._dbus_annotations = (

1124

dict(attribute._dbus_annotations))

1125

except AttributeError:

1126

pass

972

1127

# Define a creator of a function to call both the

973

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

974

# signals gets sent when the function is called

1128

# original and alternate functions, so both the

1129

# original and alternate signals gets sent when

1130

# the function is called

975

1131

def fixscope(func1, func2):

976

1132

"""This function is a scope container to pass

977

1133

func1 and func2 to the "call_both" function

984

1140

return call_both

985

1141

# Create the "call_both" function and add it to

986

1142

# the class

987

attr[attrname] = fixscope(attribute,

988

new_function)

1143

attr[attrname] = fixscope(attribute, new_function)

989

1144

# Is this a D-Bus method?

990

1145

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

991

1146

# Create a new, but exactly alike, function

1002

1157

attribute.func_name,

1003

1158

attribute.func_defaults,

1004

1159

attribute.func_closure)))

1160

# Copy annotations, if any

1161

try:

1162

attr[attrname]._dbus_annotations = (

1163

dict(attribute._dbus_annotations))

1164

except AttributeError:

1165

pass

1005

1166

# Is this a D-Bus property?

1006

1167

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

1007

1168

# Create a new, but exactly alike, function

1021

1182

attribute.func_name,

1022

1183

attribute.func_defaults,

1023

1184

attribute.func_closure)))

1024

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

1025

1026

1185

# Copy annotations, if any

1186

try:

1187

attr[attrname]._dbus_annotations = (

1188

dict(attribute._dbus_annotations))

1189

except AttributeError:

1190

pass

1191

# Is this a D-Bus interface?

1192

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

1193

# Create a new, but exactly alike, function

1194

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

1195

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

1196

# to the class.

1197

attr[attrname] = (dbus_interface_annotations

1198

(alt_interface)

1199

(types.FunctionType

1200

(attribute.func_code,

1201

attribute.func_globals,

1202

attribute.func_name,

1203

attribute.func_defaults,

1204

attribute.func_closure)))

1205

if deprecate:

1206

# Deprecate all alternate interfaces

1207

iname="_AlternateDBusNames_interface_annotation{0}"

1208

for interface_name in interface_names:

1209

@dbus_interface_annotations(interface_name)

1210

def func(self):

1211

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

1212

"true" }

1213

# Find an unused name

1214

for aname in (iname.format(i)

1215

for i in itertools.count()):

1216

if aname not in attr:

1217

attr[aname] = func

1218

break

1219

if interface_names:

1220

# Replace the class with a new subclass of it with

1221

# methods, signals, etc. as created above.

1222

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

1223

(cls,), attr)

1224

return cls

1225

return wrapper

1226

1227

1228

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

1229

"se.bsnet.fukt.Mandos"})

1027

1230

class ClientDBus(Client, DBusObjectWithProperties):

1028

1231

"""A Client class using D-Bus

1029

1232

1040

1243

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

1041

1244

self.bus = bus

1042

1245

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

1043

self._approvals_pending = 0

1044

1045

self._approvals_pending = 0

1046

1246

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

1047

1247

# the D-Bus

1048

1248

client_object_name = unicode(self.name).translate(

1052

1252

("/clients/" + client_object_name))

1053

1253

DBusObjectWithProperties.__init__(self, self.bus,

1054

1254

self.dbus_object_path)

1055

1255

1056

1256

def notifychangeproperty(transform_func,

1057

1257

dbus_name, type_func=lambda x: x,

1058

1258

variant_level=1):

1081

1281

1082

1282

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

1083

1283

1084

1085

1284

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1086

1285

approvals_pending = notifychangeproperty(dbus.Boolean,

1087

1286

"ApprovalPending",

1094

1293

checker is not None)

1095

1294

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1096

1295

"LastCheckedOK")

1296

last_checker_status = notifychangeproperty(dbus.Int16,

1297

"LastCheckerStatus")

1097

1298

last_approval_request = notifychangeproperty(

1098

1299

datetime_to_dbus, "LastApprovalRequest")

1099

1300

approved_by_default = notifychangeproperty(dbus.Boolean,

1167

1368

return False

1168

1369

1169

1370

def approve(self, value=True):

1170

self.send_changedstate()

1171

1371

self.approved = value

1172

1372

gobject.timeout_add(timedelta_to_milliseconds

1173

1373

(self.approval_duration),

1174

1374

self._reset_approved)

1175

1375

self.send_changedstate()

1176

1376

1177

1377

## D-Bus methods, signals & properties

1178

1378

_interface = "se.recompile.Mandos.Client"

1179

1379

1380

## Interfaces

1381

1382

@dbus_interface_annotations(_interface)

1383

def _foo(self):

1384

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

1385

"false"}

1386

1180

1387

## Signals

1181

1388

1182

1389

# CheckerCompleted - signal

1218

1425

"D-Bus signal"

1219

1426

return self.need_approval()

1220

1427

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

1229

1428

## Methods

1230

1429

1231

1430

# Approve - method

1341

1540

return

1342

1541

return datetime_to_dbus(self.last_checked_ok)

1343

1542

1543

# LastCheckerStatus - property

1544

@dbus_service_property(_interface, signature="n",

1545

access="read")

1546

def LastCheckerStatus_dbus_property(self):

1547

return dbus.Int16(self.last_checker_status)

1548

1344

1549

# Expires - property

1345

1550

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

1346

1551

def Expires_dbus_property(self):

1357

1562

def Timeout_dbus_property(self, value=None):

1358

1563

if value is None: # get

1359

1564

return dbus.UInt64(self.timeout_milliseconds())

1565

old_timeout = self.timeout

1360

1566

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

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))

1567

# Reschedule disabling

1568

if self.enabled:

1569

now = datetime.datetime.utcnow()

1570

self.expires += self.timeout - old_timeout

1571

if self.expires <= now:

1572

# The timeout has passed

1573

self.disable()

1574

else:

1575

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

1576

is None):

1577

return

1578

gobject.source_remove(self.disable_initiator_tag)

1579

self.disable_initiator_tag = (

1580

gobject.timeout_add(

1581

timedelta_to_milliseconds(self.expires - now),

1582

self.disable))

1381

1583

1382

1584

# ExtendedTimeout - property

1383

1585

@dbus_service_property(_interface, signature="t",

1462

1664

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

1463

1665

1464

1666

1465

class ClientDBusTransitional(ClientDBus):

1466

__metaclass__ = AlternateDBusNamesMetaclass

1467

1468

1469

1667

class ClientHandler(socketserver.BaseRequestHandler, object):

1470

1668

"""A class to handle client connections.

1471

1669

1507

1705

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

1508

1706

try:

1509

1707

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

1510

raise RuntimeError

1708

raise RuntimeError(line)

1511

1709

except (ValueError, IndexError, RuntimeError) as error:

1512

1710

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

1513

1711

return

1539

1737

except KeyError:

1540

1738

return

1541

1739

1542

if self.server.use_dbus:

1543

# Emit D-Bus signal

1544

client.NewRequest(str(self.client_address))

1545

1546

1740

if client.approval_delay:

1547

1741

delay = client.approval_delay

1548

1742

client.approvals_pending += 1

1579

1773

#wait until timeout or approved

1580

1774

time = datetime.datetime.now()

1581

1775

client.changedstate.acquire()

1582

(client.changedstate.wait

1583

(float(client.timedelta_to_milliseconds(delay)

1584

/ 1000)))

1776

client.changedstate.wait(

1777

float(timedelta_to_milliseconds(delay)

1778

/ 1000))

1585

1779

client.changedstate.release()

1586

1780

time2 = datetime.datetime.now()

1587

1781

if (time2 - time) >= delay:

1603

1797

try:

1604

1798

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

1605

1799

except gnutls.errors.GNUTLSError as error:

1606

logger.warning("gnutls send failed")

1800

logger.warning("gnutls send failed",

1801

exc_info=error)

1607

1802

return

1608

1803

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

1609

1804

sent, len(client.secret)

1612

1807

1613

1808

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

1614

1809

# bump the timeout using extended_timeout

1615

client.checked_ok(client.extended_timeout)

1810

client.bump_timeout(client.extended_timeout)

1616

1811

if self.server.use_dbus:

1617

1812

# Emit D-Bus signal

1618

1813

client.GotSecret()

1623

1818

try:

1624

1819

session.bye()

1625

1820

except gnutls.errors.GNUTLSError as error:

1626

logger.warning("GnuTLS bye failed")

1821

logger.warning("GnuTLS bye failed",

1822

exc_info=error)

1627

1823

1628

1824

@staticmethod

1629

1825

def peer_certificate(session):

1701

1897

def process_request(self, request, address):

1702

1898

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

1703

1899

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

1704

args = (request,

1705

address))

1900

args = (request, address))

1706

1901

proc.start()

1707

1902

return proc

1708

1903

1723

1918

1724

1919

def add_pipe(self, parent_pipe, proc):

1725

1920

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

1726

raise NotImplementedError

1921

raise NotImplementedError()

1727

1922

1728

1923

1729

1924

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1736

1931

use_ipv6: Boolean; to use IPv6 or not

1737

1932

"""

1738

1933

def __init__(self, server_address, RequestHandlerClass,

1739

interface=None, use_ipv6=True):

1934

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

1935

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

1936

creating a new one with socket.socket().

1937

"""

1740

1938

self.interface = interface

1741

1939

if use_ipv6:

1742

1940

self.address_family = socket.AF_INET6

1941

if socketfd is not None:

1942

# Save the file descriptor

1943

self.socketfd = socketfd

1944

# Save the original socket.socket() function

1945

self.socket_socket = socket.socket

1946

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

1947

#

1948

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

1949

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

1950

# patching socket.socket.)

1951

#

1952

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

1953

@functools.wraps(socket.socket)

1954

def socket_wrapper(*args, **kwargs):

1955

# Restore original function so subsequent calls are

1956

# not affected.

1957

socket.socket = self.socket_socket

1958

del self.socket_socket

1959

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

1960

# saved file descriptor.

1961

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

1962

# Replace socket.socket() function with wrapper

1963

socket.socket = socket_wrapper

1964

# The socketserver.TCPServer.__init__ will call

1965

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

1966

# socket_wrapper(), if socketfd was set.

1743

1967

socketserver.TCPServer.__init__(self, server_address,

1744

1968

RequestHandlerClass)

1969

1745

1970

def server_bind(self):

1746

1971

"""This overrides the normal server_bind() function

1747

1972

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

1755

1980

try:

1756

1981

self.socket.setsockopt(socket.SOL_SOCKET,

1757

1982

SO_BINDTODEVICE,

1758

str(self.interface

1759

+ '\0'))

1983

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

1760

1984

except socket.error as error:

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:

1985

if error.errno == errno.EPERM:

1986

logger.error("No permission to bind to"

1987

" interface %s", self.interface)

1988

elif error.errno == errno.ENOPROTOOPT:

1766

1989

logger.error("SO_BINDTODEVICE not available;"

1767

1990

" cannot bind to interface %s",

1768

1991

self.interface)

1992

elif error.errno == errno.ENODEV:

1993

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

1994

" cannot bind", self.interface)

1769

1995

else:

1770

1996

raise

1771

1997

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

1774

2000

if self.address_family == socket.AF_INET6:

1775

2001

any_address = "::" # in6addr_any

1776

2002

else:

1777

any_address = socket.INADDR_ANY

2003

any_address = "0.0.0.0" # INADDR_ANY

1778

2004

self.server_address = (any_address,

1779

2005

self.server_address[1])

1780

2006

elif not self.server_address[1]:

1801

2027

"""

1802

2028

def __init__(self, server_address, RequestHandlerClass,

1803

2029

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

1804

gnutls_priority=None, use_dbus=True):

2030

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

1805

2031

self.enabled = False

1806

2032

self.clients = clients

1807

2033

if self.clients is None:

1811

2037

IPv6_TCPServer.__init__(self, server_address,

1812

2038

RequestHandlerClass,

1813

2039

interface = interface,

1814

use_ipv6 = use_ipv6)

2040

use_ipv6 = use_ipv6,

2041

socketfd = socketfd)

1815

2042

def server_activate(self):

1816

2043

if self.enabled:

1817

2044

return socketserver.TCPServer.server_activate(self)

1830

2057

1831

2058

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

1832

2059

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)

1847

2060

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

1848

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

2061

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

1849

2062

# Wait for other process to exit

1850

2063

proc.join()

1851

2064

return False

1909

2122

return True

1910

2123

1911

2124

2125

def rfc3339_duration_to_delta(duration):

2126

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

2127

2128

>>> rfc3339_duration_to_delta("P7D")

2129

datetime.timedelta(7)

2130

>>> rfc3339_duration_to_delta("PT60S")

2131

datetime.timedelta(0, 60)

2132

>>> rfc3339_duration_to_delta("PT60M")

2133

datetime.timedelta(0, 3600)

2134

>>> rfc3339_duration_to_delta("PT24H")

2135

datetime.timedelta(1)

2136

>>> rfc3339_duration_to_delta("P1W")

2137

datetime.timedelta(7)

2138

>>> rfc3339_duration_to_delta("PT5M30S")

2139

datetime.timedelta(0, 330)

2140

>>> rfc3339_duration_to_delta("P1DT3M20S")

2141

datetime.timedelta(1, 200)

2142

"""

2143

2144

# Parsing an RFC 3339 duration with regular expressions is not

2145

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

2146

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

2147

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

2148

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

2149

# avoid excessive use of external libraries.

2150

2151

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

2152

Token = collections.namedtuple("Token",

2153

("regexp", # To match token; if

2154

# "value" is not None,

2155

# must have a "group"

2156

# containing digits

2157

"value", # datetime.timedelta or

2158

# None

2159

"followers")) # Tokens valid after

2160

# this token

2161

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

2162

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

2163

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

2164

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

2165

datetime.timedelta(seconds=1),

2166

frozenset((token_end,)))

2167

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

2168

datetime.timedelta(minutes=1),

2169

frozenset((token_second, token_end)))

2170

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

2171

datetime.timedelta(hours=1),

2172

frozenset((token_minute, token_end)))

2173

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

2174

None,

2175

frozenset((token_hour, token_minute,

2176

token_second)))

2177

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

2178

datetime.timedelta(days=1),

2179

frozenset((token_time, token_end)))

2180

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

2181

datetime.timedelta(weeks=4),

2182

frozenset((token_day, token_end)))

2183

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

2184

datetime.timedelta(weeks=52),

2185

frozenset((token_month, token_end)))

2186

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

2187

datetime.timedelta(weeks=1),

2188

frozenset((token_end,)))

2189

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

2190

frozenset((token_year, token_month,

2191

token_day, token_time,

2192

token_week))),

2193

# Define starting values

2194

value = datetime.timedelta() # Value so far

2195

found_token = None

2196

followers = frozenset(token_duration,) # Following valid tokens

2197

s = duration # String left to parse

2198

# Loop until end token is found

2199

while found_token is not token_end:

2200

# Search for any currently valid tokens

2201

for token in followers:

2202

match = token.regexp.match(s)

2203

if match is not None:

2204

# Token found

2205

if token.value is not None:

2206

# Value found, parse digits

2207

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

2208

# Add to value so far

2209

value += factor * token.value

2210

# Strip token from string

2211

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

2212

# Go to found token

2213

found_token = token

2214

# Set valid next tokens

2215

followers = found_token.followers

2216

break

2217

else:

2218

# No currently valid tokens were found

2219

raise ValueError("Invalid RFC 3339 duration")

2220

# End token found

2221

return value

2222

2223

1912

2224

def string_to_delta(interval):

1913

2225

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

1914

2226

1925

2237

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

1926

2238

datetime.timedelta(0, 330)

1927

2239

"""

2240

2241

try:

2242

return rfc3339_duration_to_delta(interval)

2243

except ValueError:

2244

pass

2245

1928

2246

timevalue = datetime.timedelta(0)

1929

2247

for s in interval.split():

1930

2248

try:

1941

2259

elif suffix == "w":

1942

2260

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

1943

2261

else:

1944

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

1945

except (ValueError, IndexError) as e:

2262

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

2263

.format(suffix))

2264

except IndexError as e:

1946

2265

raise ValueError(*(e.args))

1947

2266

timevalue += delta

1948

2267

return timevalue

1961

2280

sys.exit()

1962

2281

if not noclose:

1963

2282

# Close all standard open file descriptors

1964

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

2283

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

1965

2284

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

1966

2285

raise OSError(errno.ENODEV,

1967

"%s not a character device"

1968

% os.path.devnull)

2286

"{0} not a character device"

2287

.format(os.devnull))

1969

2288

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

1970

2289

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

1971

2290

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

1980

2299

1981

2300

parser = argparse.ArgumentParser()

1982

2301

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

1983

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

2302

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

1984

2303

help="show version number and exit")

1985

2304

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

1986

2305

help="Bind to interface IF")

1992

2311

help="Run self-test")

1993

2312

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

1994

2313

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

1995

" to terminal")

2314

" to terminal", default=None)

1996

2315

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

1997

2316

help="Debug level for stdout output")

1998

2317

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

2005

2324

" files")

2006

2325

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

2007

2326

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

2008

" system bus interface")

2327

" system bus interface", default=None)

2009

2328

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

2010

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

2329

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

2330

default=None)

2011

2331

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

2012

2332

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

2013

" state")

2333

" state", default=None)

2334

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

2335

help="Specify a file descriptor to a network"

2336

" socket to use instead of creating one")

2014

2337

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

2015

2338

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

2339

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

2340

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

2016

2341

2017

2342

options = parser.parse_args()

2018

2343

2027

2352

"port": "",

2028

2353

"debug": "False",

2029

2354

"priority":

2030

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

2355

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

2031

2356

"servicename": "Mandos",

2032

2357

"use_dbus": "True",

2033

2358

"use_ipv6": "True",

2034

2359

"debuglevel": "",

2035

2360

"restore": "True",

2036

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

2361

"socket": "",

2362

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

2363

"foreground": "False",

2037

2364

}

2038

2365

2039

2366

# Parse config file for server-global settings

2044

2371

# Convert the SafeConfigParser object to a dict

2045

2372

server_settings = server_config.defaults()

2046

2373

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

2047

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

2374

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

2048

2375

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

2049

2376

option)

2050

2377

if server_settings["port"]:

2051

2378

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

2052

2379

"port")

2380

if server_settings["socket"]:

2381

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

2382

"socket")

2383

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

2384

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

2385

# happen with a supplied network socket.

2386

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

2387

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

2388

["socket"])

2053

2389

del server_config

2054

2390

2055

2391

# Override the settings from the config file with command line

2057

2393

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

2058

2394

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

2059

2395

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

2060

"statedir"):

2396

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

2061

2397

value = getattr(options, option)

2062

2398

if value is not None:

2063

2399

server_settings[option] = value

2066

2402

for option in server_settings.keys():

2067

2403

if type(server_settings[option]) is str:

2068

2404

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

2405

# Force all boolean options to be boolean

2406

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

2407

"foreground"):

2408

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

2409

# Debug implies foreground

2410

if server_settings["debug"]:

2411

server_settings["foreground"] = True

2069

2412

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

2070

2413

2071

2414

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

2077

2420

use_ipv6 = server_settings["use_ipv6"]

2078

2421

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

2079

2422

stored_state_file)

2423

foreground = server_settings["foreground"]

2080

2424

2081

2425

if debug:

2082

2426

initlogger(debug, logging.DEBUG)

2089

2433

2090

2434

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

2091

2435

syslogger.setFormatter(logging.Formatter

2092

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

2093

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

2094

% server_settings["servicename"]))

2436

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

2437

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

2438

.format(server_settings

2439

["servicename"])))

2095

2440

2096

2441

# Parse config file with clients

2097

client_config = configparser.SafeConfigParser(Client.client_defaults)

2442

client_config = configparser.SafeConfigParser(Client

2443

.client_defaults)

2098

2444

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

2099

2445

"clients.conf"))

2100

2446

2109

2455

use_ipv6=use_ipv6,

2110

2456

gnutls_priority=

2111

2457

server_settings["priority"],

2112

use_dbus=use_dbus)

2113

if not debug:

2114

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

2458

use_dbus=use_dbus,

2459

socketfd=(server_settings["socket"]

2460

or None))

2461

if not foreground:

2462

pidfilename = "/run/mandos.pid"

2463

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

2464

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

2465

pidfile = None

2115

2466

try:

2116

2467

pidfile = open(pidfilename, "w")

2117

except IOError:

2118

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

2468

except IOError as e:

2469

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

2470

exc_info=e)

2119

2471

2120

try:

2121

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

2122

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

2123

except KeyError:

2472

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

2124

2473

try:

2125

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

2126

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

2474

uid = pwd.getpwnam(name).pw_uid

2475

gid = pwd.getpwnam(name).pw_gid

2476

break

2127

2477

except KeyError:

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

2478

continue

2479

else:

2480

uid = 65534

2481

gid = 65534

2134

2482

try:

2135

2483

os.setgid(gid)

2136

2484

os.setuid(uid)

2137

2485

except OSError as error:

2138

if error[0] != errno.EPERM:

2139

raise error

2486

if error.errno != errno.EPERM:

2487

raise

2140

2488

2141

2489

if debug:

2142

2490

# Enable all possible GnuTLS debugging

2153

2501

.gnutls_global_set_log_function(debug_gnutls))

2154

2502

2155

2503

# Redirect stdin so all checkers get /dev/null

2156

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

2504

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

2157

2505

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

2158

2506

if null > 2:

2159

2507

os.close(null)

2160

2508

2161

2509

# Need to fork before connecting to D-Bus

2162

if not debug:

2510

if not foreground:

2163

2511

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

2164

2512

daemon()

2165

2513

2514

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

2515

# need to inform gobject that threads will be used.

2166

2516

gobject.threads_init()

2167

2517

2168

2518

global main_loop

2169

2519

# From the Avahi example code

2170

DBusGMainLoop(set_as_default=True )

2520

DBusGMainLoop(set_as_default=True)

2171

2521

main_loop = gobject.MainLoop()

2172

2522

bus = dbus.SystemBus()

2173

2523

# End of Avahi example code

2179

2529

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

2180

2530

do_not_queue=True))

2181

2531

except dbus.exceptions.NameExistsException as e:

2182

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

2532

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

2183

2533

use_dbus = False

2184

2534

server_settings["use_dbus"] = False

2185

2535

tcp_server.use_dbus = False

2197

2547

2198

2548

client_class = Client

2199

2549

if use_dbus:

2200

client_class = functools.partial(ClientDBusTransitional,

2201

bus = bus)

2550

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

2202

2551

2203

2552

client_settings = Client.config_parser(client_config)

2204

2553

old_client_settings = {}

2205

2554

clients_data = {}

2206

2555

2556

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

2557

global wnull

2558

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

2559

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

2560

# mode

2561

if debug or not foreground:

2562

wnull.close()

2563

2207

2564

# Get client data and settings from last running state.

2208

2565

if server_settings["restore"]:

2209

2566

try:

2212

2569

(stored_state))

2213

2570

os.remove(stored_state_path)

2214

2571

except IOError as e:

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2572

if e.errno == errno.ENOENT:

2573

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

2574

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

2575

else:

2576

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

2577

exc_info=e)

2218

2578

raise

2219

2579

except EOFError as e:

2220

2580

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

2221

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

2581

"EOFError:", exc_info=e)

2222

2582

2223

2583

with PGPEngine() as pgp:

2224

2584

for client_name, client in clients_data.iteritems():

2585

# Skip removed clients

2586

if client_name not in client_settings:

2587

continue

2588

2225

2589

# Decide which value to use after restoring saved state.

2226

2590

# We have three different values: Old config file,

2227

2591

# new config file, and saved state.

2241

2605

2242

2606

# Clients who has passed its expire date can still be

2243

2607

# enabled if its last checker was successful. Clients

2244

# whose checker failed before we stored its state is

2245

# assumed to have failed all checkers during downtime.

2608

# whose checker succeeded before we stored its state is

2609

# assumed to have successfully run all checkers during

2610

# downtime.

2246

2611

if client["enabled"]:

2247

2612

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

2248

2613

if not client["last_checked_ok"]:

2249

2614

logger.warning(

2250

2615

"disabling client {0} - Client never "

2251

"performed a successfull checker"

2252

.format(client["name"]))

2616

"performed a successful checker"

2617

.format(client_name))

2253

2618

client["enabled"] = False

2254

2619

elif client["last_checker_status"] != 0:

2255

2620

logger.warning(

2256

2621

"disabling client {0} - Client "

2257

2622

"last checker failed with error code {1}"

2258

.format(client["name"],

2623

.format(client_name,

2259

2624

client["last_checker_status"]))

2260

2625

client["enabled"] = False

2261

2626

else:

2262

2627

client["expires"] = (datetime.datetime

2263

2628

.utcnow()

2264

2629

+ client["timeout"])

2265

2630

logger.debug("Last checker succeeded,"

2631

" keeping {0} enabled"

2632

.format(client_name))

2266

2633

try:

2267

2634

client["secret"] = (

2268

2635

pgp.decrypt(client["encrypted_secret"],

2274

2641

.format(client_name))

2275

2642

client["secret"] = (

2276

2643

client_settings[client_name]["secret"])

2277

2278

2644

2279

2645

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

2280

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

2646

for client_name in (set(old_client_settings)

2647

- set(client_settings)):

2281

2648

del clients_data[client_name]

2282

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

2649

for client_name in (set(client_settings)

2650

- set(old_client_settings)):

2283

2651

clients_data[client_name] = client_settings[client_name]

2284

2285

# Create clients all clients

2652

2653

# Create all client objects

2286

2654

for client_name, client in clients_data.iteritems():

2287

2655

tcp_server.clients[client_name] = client_class(

2288

name = client_name, settings = client)

2656

name = client_name, settings = client,

2657

server_settings = server_settings)

2289

2658

2290

2659

if not tcp_server.clients:

2291

2660

logger.warning("No clients defined")

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

2661

2662

if not foreground:

2663

if pidfile is not None:

2664

try:

2665

with pidfile:

2666

pid = os.getpid()

2667

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

2668

except IOError:

2669

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

2670

pidfilename, pid)

2671

del pidfile

2305

2672

del pidfilename

2306

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

2307

2673

2308

2674

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

2309

2675

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

2310

2676

2311

2677

if use_dbus:

2312

class MandosDBusService(dbus.service.Object):

2678

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

2679

"se.bsnet.fukt.Mandos"})

2680

class MandosDBusService(DBusObjectWithProperties):

2313

2681

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

2314

2682

def __init__(self):

2315

2683

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

2316

2684

_interface = "se.recompile.Mandos"

2317

2685

2686

@dbus_interface_annotations(_interface)

2687

def _foo(self):

2688

return { "org.freedesktop.DBus.Property"

2689

".EmitsChangedSignal":

2690

"false"}

2691

2318

2692

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

2319

2693

def ClientAdded(self, objpath):

2320

2694

"D-Bus signal"

2362

2736

2363

2737

del _interface

2364

2738

2365

class MandosDBusServiceTransitional(MandosDBusService):

2366

__metaclass__ = AlternateDBusNamesMetaclass

2367

mandos_dbus_service = MandosDBusServiceTransitional()

2739

mandos_dbus_service = MandosDBusService()

2368

2740

2369

2741

def cleanup():

2370

2742

"Cleanup function; run on exit"

2371

2743

service.cleanup()

2372

2744

2373

2745

multiprocessing.active_children()

2746

wnull.close()

2374

2747

if not (tcp_server.clients or client_settings):

2375

2748

return

2376

2749

2388

2761

# A list of attributes that can not be pickled

2389

2762

# + secret.

2390

2763

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

2391

"checker"))

2764

"checker", "server_settings"))

2392

2765

for name, typ in (inspect.getmembers

2393

2766

(dbus.service.Object)):

2394

2767

exclude.add(name)

2403

2776

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

2404

2777

2405

2778

try:

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:

2779

with (tempfile.NamedTemporaryFile

2780

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

2781

dir=os.path.dirname(stored_state_path),

2782

delete=False)) as stored_state:

2411

2783

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

2784

tempname=stored_state.name

2412

2785

os.rename(tempname, stored_state_path)

2413

2786

except (IOError, OSError) as e:

2414

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

2415

.format(e))

2416

2787

if not debug:

2417

2788

try:

2418

2789

os.remove(tempname)

2419

2790

except NameError:

2420

2791

pass

2421

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

2422

errno.EEXIST)):

2423

raise e

2792

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

2793

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

2794

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

2795

else:

2796

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

2797

exc_info=e)

2798

raise

2424

2799

2425

2800

# Delete all clients, and settings from config

2426

2801

while tcp_server.clients:

2453

2828

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

2454

2829

if use_ipv6:

2455

2830

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

2456

" flowinfo %d, scope_id %d"

2457

% tcp_server.socket.getsockname())

2831

" flowinfo %d, scope_id %d",

2832

*tcp_server.socket.getsockname())

2458

2833

else: # IPv4

2459

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

2460

% tcp_server.socket.getsockname())

2834

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

2835

*tcp_server.socket.getsockname())

2461

2836

2462

2837

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

2463

2838

2466

2841

try:

2467

2842

service.activate()

2468

2843

except dbus.exceptions.DBusException as error:

2469

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

2844

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

2470

2845

cleanup()

2471

2846

sys.exit(1)

2472

2847

# End of Avahi example code

2479

2854

logger.debug("Starting main loop")

2480

2855

main_loop.run()

2481

2856

except AvahiError as error:

2482

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

2857

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

2483

2858

cleanup()

2484

2859

sys.exit(1)

2485

2860

except KeyboardInterrupt: