/mandos/release : revision 296

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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 = "1.6.1"

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version = "1.5.2"

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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.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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

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

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self._cleanup()

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return False

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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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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"extended_timeout": "15m",

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"interval": "2m",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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% section)

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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client["last_checker_status"] = -2

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return settings

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

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

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

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

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attribute."""

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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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else:

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self.last_enabled = None

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self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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

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# Already enabled

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return

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self.send_changedstate()

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

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

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if not quiet:

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self.send_changedstate()

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if not quiet:

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

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

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

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

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

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

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

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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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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.

616

if self.checker_initiator_tag is not None:

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = (gobject.timeout_add

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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

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

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timeout = self.timeout

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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

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self.disable_initiator_tag = (gobject.timeout_add

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(timedelta_to_milliseconds

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If a checker already exists, leave it running and do

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nothing."""

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

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

677

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

678

# would inevitably timeout, since no checker would get a

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

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

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

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# client would inevitably timeout, since no checker would get

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

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

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

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662

# should be.

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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:

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# Escape attributes for the shell

700

escaped_attrs = dict(

701

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

702

for attr in

703

self.runtime_expansions)

704

679

try:

705

command = self.checker_command % escaped_attrs

706

except TypeError as error:

707

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

708

self.checker_command, exc_info=error)

709

return True # Try again later

680

# In case checker_command has exactly one % operator

681

command = self.checker_command % self.host

682

except TypeError:

683

# Escape attributes for the shell

684

escaped_attrs = dict(

685

(attr,

686

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

687

errors=

688

'replace')))

689

for attr in

690

self.runtime_expansions)

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692

try:

693

command = self.checker_command % escaped_attrs

694

except TypeError as error:

695

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

696

' %s', self.checker_command, error)

697

return True # Try again later

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self.current_checker_command = command

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699

try:

712

700

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

715

703

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

716

704

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

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705

# always replaced by /dev/null.)

718

# The exception is when not debugging but nevertheless

719

# running in the foreground; use the previously

720

# created wnull.

721

popen_args = {}

722

if (not self.server_settings["debug"]

723

and self.server_settings["foreground"]):

724

popen_args.update({"stdout": wnull,

725

"stderr": wnull })

726

706

self.checker = subprocess.Popen(command,

727

707

close_fds=True,

728

shell=True, cwd="/",

729

**popen_args)

730

except OSError as error:

731

logger.error("Failed to start subprocess",

732

exc_info=error)

733

return True

734

self.checker_callback_tag = (gobject.child_watch_add

735

(self.checker.pid,

736

self.checker_callback,

737

data=command))

738

# The checker may have completed before the gobject

739

# watch was added. Check for this.

740

try:

708

shell=True, cwd="/")

709

self.checker_callback_tag = (gobject.child_watch_add

710

(self.checker.pid,

711

self.checker_callback,

712

data=command))

713

# The checker may have completed before the gobject

714

# watch was added. Check for this.

741

715

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

716

if pid:

717

gobject.source_remove(self.checker_callback_tag)

718

self.checker_callback(pid, status, command)

742

719

except OSError as error:

743

if error.errno == errno.ECHILD:

744

# This should never happen

745

logger.error("Child process vanished",

746

exc_info=error)

747

return True

748

raise

749

if pid:

750

gobject.source_remove(self.checker_callback_tag)

751

self.checker_callback(pid, status, command)

720

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

721

error)

752

722

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

753

723

return True

754

724

761

731

return

762

732

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

763

733

try:

764

self.checker.terminate()

734

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

765

735

#time.sleep(0.5)

766

736

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

767

# self.checker.kill()

737

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

768

738

except OSError as error:

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739

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

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740

raise

787

757

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

788

758

if byte_arrays and signature != "ay":

789

759

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

790

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

760

" signature %r" % signature)

791

761

def decorator(func):

792

762

func._dbus_is_property = True

793

763

func._dbus_interface = dbus_interface

801

771

return decorator

802

772

803

773

804

def dbus_interface_annotations(dbus_interface):

805

"""Decorator for marking functions returning interface annotations

806

807

Usage:

808

809

@dbus_interface_annotations("org.example.Interface")

810

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

811

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

812

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

813

"false"}

814

"""

815

def decorator(func):

816

func._dbus_is_interface = True

817

func._dbus_interface = dbus_interface

818

func._dbus_name = dbus_interface

819

return func

820

return decorator

821

822

823

def dbus_annotations(annotations):

824

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

825

Usage:

826

827

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

828

access="r")

829

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

830

"org.freedesktop.DBus.Property."

831

"EmitsChangedSignal": "false"})

832

def Property_dbus_property(self):

833

return dbus.Boolean(False)

834

"""

835

def decorator(func):

836

func._dbus_annotations = annotations

837

return func

838

return decorator

839

840

841

774

class DBusPropertyException(dbus.exceptions.DBusException):

842

775

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

843

776

"""

866

799

"""

867

800

868

801

@staticmethod

869

def _is_dbus_thing(thing):

870

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

871

872

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

873

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

874

"""

875

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

876

False)

802

def _is_dbus_property(obj):

803

return getattr(obj, "_dbus_is_property", False)

877

804

878

def _get_all_dbus_things(self, thing):

805

def _get_all_dbus_properties(self):

879

806

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

880

807

"""

881

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

882

name),

883

athing.__get__(self))

808

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

884

809

for cls in self.__class__.__mro__

885

for name, athing in

886

inspect.getmembers(cls,

887

self._is_dbus_thing(thing)))

810

for name, prop in

811

inspect.getmembers(cls, self._is_dbus_property))

888

812

889

813

def _get_dbus_property(self, interface_name, property_name):

890

814

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

892

816

"""

893

817

for cls in self.__class__.__mro__:

894

818

for name, value in (inspect.getmembers

895

(cls,

896

self._is_dbus_thing("property"))):

819

(cls, self._is_dbus_property)):

897

820

if (value._dbus_name == property_name

898

821

and value._dbus_interface == interface_name):

899

822

return value.__get__(self)

941

864

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

942

865

"""

943

866

properties = {}

944

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

867

for name, prop in self._get_all_dbus_properties():

945

868

if (interface_name

946

869

and interface_name != prop._dbus_interface):

947

870

# Interface non-empty but did not match

962

885

path_keyword='object_path',

963

886

connection_keyword='connection')

964

887

def Introspect(self, object_path, connection):

965

"""Overloading of standard D-Bus method.

966

967

Inserts property tags and interface annotation tags.

888

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

968

889

"""

969

890

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

970

891

connection)

977

898

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

978

899

return e

979

900

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

980

# Add property tags

981

901

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

982

902

for name, prop

983

in self._get_all_dbus_things("property")

903

in self._get_all_dbus_properties()

984

904

if prop._dbus_interface

985

905

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

986

906

if_tag.appendChild(tag)

987

# Add annotation tags

988

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

989

for tag in if_tag.getElementsByTagName(typ):

990

annots = dict()

991

for name, prop in (self.

992

_get_all_dbus_things(typ)):

993

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

994

and prop._dbus_interface

995

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

996

annots.update(getattr

997

(prop,

998

"_dbus_annotations",

999

{}))

1000

for name, value in annots.iteritems():

1001

ann_tag = document.createElement(

1002

"annotation")

1003

ann_tag.setAttribute("name", name)

1004

ann_tag.setAttribute("value", value)

1005

tag.appendChild(ann_tag)

1006

# Add interface annotation tags

1007

for annotation, value in dict(

1008

itertools.chain.from_iterable(

1009

annotations().iteritems()

1010

for name, annotations in

1011

self._get_all_dbus_things("interface")

1012

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

1013

)).iteritems():

1014

ann_tag = document.createElement("annotation")

1015

ann_tag.setAttribute("name", annotation)

1016

ann_tag.setAttribute("value", value)

1017

if_tag.appendChild(ann_tag)

1018

907

# Add the names to the return values for the

1019

908

# "org.freedesktop.DBus.Properties" methods

1020

909

if (if_tag.getAttribute("name")

1035

924

except (AttributeError, xml.dom.DOMException,

1036

925

xml.parsers.expat.ExpatError) as error:

1037

926

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

1038

exc_info=error)

927

error)

1039

928

return xmlstring

1040

929

1041

930

1042

def datetime_to_dbus(dt, variant_level=0):

931

def datetime_to_dbus (dt, variant_level=0):

1043

932

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

1044

933

if dt is None:

1045

934

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

1047

936

variant_level=variant_level)

1048

937

1049

938

1050

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1051

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

1052

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

1053

interface names according to the "alt_interface_names" mapping.

1054

Usage:

1055

1056

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

1057

"net.example.AlternateInterface"})

1058

class SampleDBusObject(dbus.service.Object):

1059

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

1060

def SampleDBusMethod():

1061

pass

1062

1063

The above "SampleDBusMethod" on "SampleDBusObject" will be

1064

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

1065

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

1066

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

1067

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

1068

1069

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

1070

(from DBusObjectWithProperties) and interfaces (from the

1071

dbus_interface_annotations decorator).

939

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

940

.__metaclass__):

941

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

942

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

1072

943

"""

1073

def wrapper(cls):

1074

for orig_interface_name, alt_interface_name in (

1075

alt_interface_names.iteritems()):

1076

attr = {}

1077

interface_names = set()

1078

# Go though all attributes of the class

1079

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

944

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

945

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

946

# methods, signals, or properties in them

947

for base in (b for b in bases

948

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

949

# Go though all attributes of the base class

950

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

1080

951

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

1081

952

# with the wrong interface name

1082

953

if (not hasattr(attribute, "_dbus_interface")

1083

954

or not attribute._dbus_interface

1084

.startswith(orig_interface_name)):

955

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

1085

956

continue

1086

957

# Create an alternate D-Bus interface name based on

1087

958

# the current name

1088

959

alt_interface = (attribute._dbus_interface

1089

.replace(orig_interface_name,

1090

alt_interface_name))

1091

interface_names.add(alt_interface)

960

.replace("se.recompile.Mandos",

961

"se.bsnet.fukt.Mandos"))

1092

962

# Is this a D-Bus signal?

1093

963

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

1094

# Extract the original non-method undecorated

1095

# function by black magic

964

# Extract the original non-method function by

965

# black magic

1096

966

nonmethod_func = (dict(

1097

967

zip(attribute.func_code.co_freevars,

1098

968

attribute.__closure__))["func"]

1109

979

nonmethod_func.func_name,

1110

980

nonmethod_func.func_defaults,

1111

981

nonmethod_func.func_closure)))

1112

# Copy annotations, if any

1113

try:

1114

new_function._dbus_annotations = (

1115

dict(attribute._dbus_annotations))

1116

except AttributeError:

1117

pass

1118

982

# Define a creator of a function to call both the

1119

# original and alternate functions, so both the

1120

# original and alternate signals gets sent when

1121

# the function is called

983

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

984

# signals gets sent when the function is called

1122

985

def fixscope(func1, func2):

1123

986

"""This function is a scope container to pass

1124

987

func1 and func2 to the "call_both" function

1131

994

return call_both

1132

995

# Create the "call_both" function and add it to

1133

996

# the class

1134

attr[attrname] = fixscope(attribute, new_function)

997

attr[attrname] = fixscope(attribute,

998

new_function)

1135

999

# Is this a D-Bus method?

1136

1000

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

1137

1001

# Create a new, but exactly alike, function

1148

1012

attribute.func_name,

1149

1013

attribute.func_defaults,

1150

1014

attribute.func_closure)))

1151

# Copy annotations, if any

1152

try:

1153

attr[attrname]._dbus_annotations = (

1154

dict(attribute._dbus_annotations))

1155

except AttributeError:

1156

pass

1157

1015

# Is this a D-Bus property?

1158

1016

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

1159

1017

# Create a new, but exactly alike, function

1173

1031

attribute.func_name,

1174

1032

attribute.func_defaults,

1175

1033

attribute.func_closure)))

1176

# Copy annotations, if any

1177

try:

1178

attr[attrname]._dbus_annotations = (

1179

dict(attribute._dbus_annotations))

1180

except AttributeError:

1181

pass

1182

# Is this a D-Bus interface?

1183

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

1184

# Create a new, but exactly alike, function

1185

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

1186

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

1187

# to the class.

1188

attr[attrname] = (dbus_interface_annotations

1189

(alt_interface)

1190

(types.FunctionType

1191

(attribute.func_code,

1192

attribute.func_globals,

1193

attribute.func_name,

1194

attribute.func_defaults,

1195

attribute.func_closure)))

1196

if deprecate:

1197

# Deprecate all alternate interfaces

1198

iname="_AlternateDBusNames_interface_annotation{0}"

1199

for interface_name in interface_names:

1200

@dbus_interface_annotations(interface_name)

1201

def func(self):

1202

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

1203

"true" }

1204

# Find an unused name

1205

for aname in (iname.format(i)

1206

for i in itertools.count()):

1207

if aname not in attr:

1208

attr[aname] = func

1209

break

1210

if interface_names:

1211

# Replace the class with a new subclass of it with

1212

# methods, signals, etc. as created above.

1213

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

1214

(cls,), attr)

1215

return cls

1216

return wrapper

1217

1218

1219

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

1220

"se.bsnet.fukt.Mandos"})

1034

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

1035

1036

1221

1037

class ClientDBus(Client, DBusObjectWithProperties):

1222

1038

"""A Client class using D-Bus

1223

1039

1243

1059

("/clients/" + client_object_name))

1244

1060

DBusObjectWithProperties.__init__(self, self.bus,

1245

1061

self.dbus_object_path)

1246

1062

1247

1063

def notifychangeproperty(transform_func,

1248

1064

dbus_name, type_func=lambda x: x,

1249

1065

variant_level=1):

1272

1088

1273

1089

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

1274

1090

1091

1275

1092

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1276

1093

approvals_pending = notifychangeproperty(dbus.Boolean,

1277

1094

"ApprovalPending",

1359

1176

return False

1360

1177

1361

1178

def approve(self, value=True):

1179

self.send_changedstate()

1362

1180

self.approved = value

1363

1181

gobject.timeout_add(timedelta_to_milliseconds

1364

1182

(self.approval_duration),

1365

1183

self._reset_approved)

1366

self.send_changedstate()

1184

1367

1185

1368

1186

## D-Bus methods, signals & properties

1369

1187

_interface = "se.recompile.Mandos.Client"

1370

1188

1371

## Interfaces

1372

1373

@dbus_interface_annotations(_interface)

1374

def _foo(self):

1375

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

1376

"false"}

1377

1378

1189

## Signals

1379

1190

1380

1191

# CheckerCompleted - signal

1553

1364

def Timeout_dbus_property(self, value=None):

1554

1365

if value is None: # get

1555

1366

return dbus.UInt64(self.timeout_milliseconds())

1556

old_timeout = self.timeout

1557

1367

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

1558

# Reschedule disabling

1368

# Reschedule timeout

1559

1369

if self.enabled:

1560

1370

now = datetime.datetime.utcnow()

1561

self.expires += self.timeout - old_timeout

1562

if self.expires <= now:

1371

time_to_die = timedelta_to_milliseconds(

1372

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

1373

if time_to_die <= 0:

1563

1374

# The timeout has passed

1564

1375

self.disable()

1565

1376

else:

1377

self.expires = (now +

1378

datetime.timedelta(milliseconds =

1379

time_to_die))

1566

1380

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

1567

1381

is None):

1568

1382

return

1569

1383

gobject.source_remove(self.disable_initiator_tag)

1570

self.disable_initiator_tag = (

1571

gobject.timeout_add(

1572

timedelta_to_milliseconds(self.expires - now),

1573

self.disable))

1384

self.disable_initiator_tag = (gobject.timeout_add

1385

(time_to_die,

1386

self.disable))

1574

1387

1575

1388

# ExtendedTimeout - property

1576

1389

@dbus_service_property(_interface, signature="t",

1655

1468

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

1656

1469

1657

1470

1471

class ClientDBusTransitional(ClientDBus):

1472

__metaclass__ = AlternateDBusNamesMetaclass

1473

1474

1658

1475

class ClientHandler(socketserver.BaseRequestHandler, object):

1659

1476

"""A class to handle client connections.

1660

1477

1764

1581

#wait until timeout or approved

1765

1582

time = datetime.datetime.now()

1766

1583

client.changedstate.acquire()

1767

client.changedstate.wait(

1768

float(timedelta_to_milliseconds(delay)

1769

/ 1000))

1584

(client.changedstate.wait

1585

(float(client.timedelta_to_milliseconds(delay)

1586

/ 1000)))

1770

1587

client.changedstate.release()

1771

1588

time2 = datetime.datetime.now()

1772

1589

if (time2 - time) >= delay:

1788

1605

try:

1789

1606

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

1790

1607

except gnutls.errors.GNUTLSError as error:

1791

logger.warning("gnutls send failed",

1792

exc_info=error)

1608

logger.warning("gnutls send failed")

1793

1609

return

1794

1610

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

1795

1611

sent, len(client.secret)

1809

1625

try:

1810

1626

session.bye()

1811

1627

except gnutls.errors.GNUTLSError as error:

1812

logger.warning("GnuTLS bye failed",

1813

exc_info=error)

1628

logger.warning("GnuTLS bye failed")

1814

1629

1815

1630

@staticmethod

1816

1631

def peer_certificate(session):

1888

1703

def process_request(self, request, address):

1889

1704

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

1890

1705

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

1891

args = (request, address))

1706

args = (request,

1707

address))

1892

1708

proc.start()

1893

1709

return proc

1894

1710

1922

1738

use_ipv6: Boolean; to use IPv6 or not

1923

1739

"""

1924

1740

def __init__(self, server_address, RequestHandlerClass,

1925

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

1926

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

1927

creating a new one with socket.socket().

1928

"""

1741

interface=None, use_ipv6=True):

1929

1742

self.interface = interface

1930

1743

if use_ipv6:

1931

1744

self.address_family = socket.AF_INET6

1932

if socketfd is not None:

1933

# Save the file descriptor

1934

self.socketfd = socketfd

1935

# Save the original socket.socket() function

1936

self.socket_socket = socket.socket

1937

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

1938

#

1939

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

1940

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

1941

# patching socket.socket.)

1942

#

1943

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

1944

@functools.wraps(socket.socket)

1945

def socket_wrapper(*args, **kwargs):

1946

# Restore original function so subsequent calls are

1947

# not affected.

1948

socket.socket = self.socket_socket

1949

del self.socket_socket

1950

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

1951

# saved file descriptor.

1952

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

1953

# Replace socket.socket() function with wrapper

1954

socket.socket = socket_wrapper

1955

# The socketserver.TCPServer.__init__ will call

1956

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

1957

# socket_wrapper(), if socketfd was set.

1958

1745

socketserver.TCPServer.__init__(self, server_address,

1959

1746

RequestHandlerClass)

1960

1961

1747

def server_bind(self):

1962

1748

"""This overrides the normal server_bind() function

1963

1749

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

1971

1757

try:

1972

1758

self.socket.setsockopt(socket.SOL_SOCKET,

1973

1759

SO_BINDTODEVICE,

1974

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

1760

str(self.interface

1761

+ '\0'))

1975

1762

except socket.error as error:

1976

if error.errno == errno.EPERM:

1977

logger.error("No permission to bind to"

1978

" interface %s", self.interface)

1979

elif error.errno == errno.ENOPROTOOPT:

1763

if error[0] == errno.EPERM:

1764

logger.error("No permission to"

1765

" bind to interface %s",

1766

self.interface)

1767

elif error[0] == errno.ENOPROTOOPT:

1980

1768

logger.error("SO_BINDTODEVICE not available;"

1981

1769

" cannot bind to interface %s",

1982

1770

self.interface)

1983

elif error.errno == errno.ENODEV:

1984

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

1985

" cannot bind", self.interface)

1986

1771

else:

1987

1772

raise

1988

1773

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

1991

1776

if self.address_family == socket.AF_INET6:

1992

1777

any_address = "::" # in6addr_any

1993

1778

else:

1994

any_address = "0.0.0.0" # INADDR_ANY

1779

any_address = socket.INADDR_ANY

1995

1780

self.server_address = (any_address,

1996

1781

self.server_address[1])

1997

1782

elif not self.server_address[1]:

2018

1803

"""

2019

1804

def __init__(self, server_address, RequestHandlerClass,

2020

1805

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

2021

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

1806

gnutls_priority=None, use_dbus=True):

2022

1807

self.enabled = False

2023

1808

self.clients = clients

2024

1809

if self.clients is None:

2028

1813

IPv6_TCPServer.__init__(self, server_address,

2029

1814

RequestHandlerClass,

2030

1815

interface = interface,

2031

use_ipv6 = use_ipv6,

2032

socketfd = socketfd)

1816

use_ipv6 = use_ipv6)

2033

1817

def server_activate(self):

2034

1818

if self.enabled:

2035

1819

return socketserver.TCPServer.server_activate(self)

2048

1832

2049

1833

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

2050

1834

proc = None, client_object=None):

1835

condition_names = {

1836

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

1837

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

1838

# blocking).

1839

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

1840

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

1841

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

1842

# broken, usually for pipes and

1843

# sockets).

1844

}

1845

conditions_string = ' | '.join(name

1846

for cond, name in

1847

condition_names.iteritems()

1848

if cond & condition)

2051

1849

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

2052

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

1850

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

2053

1851

# Wait for other process to exit

2054

1852

proc.join()

2055

1853

return False

2113

1911

return True

2114

1912

2115

1913

2116

def rfc3339_duration_to_delta(duration):

2117

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

2118

2119

>>> rfc3339_duration_to_delta("P7D")

2120

datetime.timedelta(7)

2121

>>> rfc3339_duration_to_delta("PT60S")

2122

datetime.timedelta(0, 60)

2123

>>> rfc3339_duration_to_delta("PT60M")

2124

datetime.timedelta(0, 3600)

2125

>>> rfc3339_duration_to_delta("PT24H")

2126

datetime.timedelta(1)

2127

>>> rfc3339_duration_to_delta("P1W")

2128

datetime.timedelta(7)

2129

>>> rfc3339_duration_to_delta("PT5M30S")

2130

datetime.timedelta(0, 330)

2131

>>> rfc3339_duration_to_delta("P1DT3M20S")

2132

datetime.timedelta(1, 200)

2133

"""

2134

2135

# Parsing an RFC 3339 duration with regular expressions is not

2136

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

2137

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

2138

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

2139

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

2140

# avoid excessive use of external libraries.

2141

2142

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

2143

Token = collections.namedtuple("Token",

2144

("regexp", # To match token; if

2145

# "value" is not None,

2146

# must have a "group"

2147

# containing digits

2148

"value", # datetime.timedelta or

2149

# None

2150

"followers")) # Tokens valid after

2151

# this token

2152

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

2153

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

2154

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

2155

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

2156

datetime.timedelta(seconds=1),

2157

frozenset((token_end,)))

2158

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

2159

datetime.timedelta(minutes=1),

2160

frozenset((token_second, token_end)))

2161

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

2162

datetime.timedelta(hours=1),

2163

frozenset((token_minute, token_end)))

2164

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

2165

None,

2166

frozenset((token_hour, token_minute,

2167

token_second)))

2168

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

2169

datetime.timedelta(days=1),

2170

frozenset((token_time, token_end)))

2171

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

2172

datetime.timedelta(weeks=4),

2173

frozenset((token_day, token_end)))

2174

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

2175

datetime.timedelta(weeks=52),

2176

frozenset((token_month, token_end)))

2177

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

2178

datetime.timedelta(weeks=1),

2179

frozenset((token_end,)))

2180

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

2181

frozenset((token_year, token_month,

2182

token_day, token_time,

2183

token_week))),

2184

# Define starting values

2185

value = datetime.timedelta() # Value so far

2186

found_token = None

2187

followers = frozenset(token_duration,) # Following valid tokens

2188

s = duration # String left to parse

2189

# Loop until end token is found

2190

while found_token is not token_end:

2191

# Search for any currently valid tokens

2192

for token in followers:

2193

match = token.regexp.match(s)

2194

if match is not None:

2195

# Token found

2196

if token.value is not None:

2197

# Value found, parse digits

2198

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

2199

# Add to value so far

2200

value += factor * token.value

2201

# Strip token from string

2202

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

2203

# Go to found token

2204

found_token = token

2205

# Set valid next tokens

2206

followers = found_token.followers

2207

break

2208

else:

2209

# No currently valid tokens were found

2210

raise ValueError("Invalid RFC 3339 duration")

2211

# End token found

2212

return value

2213

2214

2215

1914

def string_to_delta(interval):

2216

1915

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

2217

1916

2228

1927

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

2229

1928

datetime.timedelta(0, 330)

2230

1929

"""

2231

2232

try:

2233

return rfc3339_duration_to_delta(interval)

2234

except ValueError:

2235

pass

2236

2237

1930

timevalue = datetime.timedelta(0)

2238

1931

for s in interval.split():

2239

1932

try:

2250

1943

elif suffix == "w":

2251

1944

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

2252

1945

else:

2253

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

2254

.format(suffix))

1946

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

2255

1947

except (ValueError, IndexError) as e:

2256

1948

raise ValueError(*(e.args))

2257

1949

timevalue += delta

2271

1963

sys.exit()

2272

1964

if not noclose:

2273

1965

# Close all standard open file descriptors

2274

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

1966

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

2275

1967

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

2276

1968

raise OSError(errno.ENODEV,

2277

"{0} not a character device"

2278

.format(os.devnull))

1969

"%s not a character device"

1970

% os.path.devnull)

2279

1971

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

2280

1972

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

2281

1973

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

2290

1982

2291

1983

parser = argparse.ArgumentParser()

2292

1984

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

2293

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

1985

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

2294

1986

help="show version number and exit")

2295

1987

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

2296

1988

help="Bind to interface IF")

2302

1994

help="Run self-test")

2303

1995

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

2304

1996

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

2305

" to terminal", default=None)

1997

" to terminal")

2306

1998

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

2307

1999

help="Debug level for stdout output")

2308

2000

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

2315

2007

" files")

2316

2008

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

2317

2009

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

2318

" system bus interface", default=None)

2010

" system bus interface")

2319

2011

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

2320

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

2321

default=None)

2012

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

2322

2013

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

2323

2014

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

2324

" state", default=None)

2325

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

2326

help="Specify a file descriptor to a network"

2327

" socket to use instead of creating one")

2015

" state")

2328

2016

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

2329

2017

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

2330

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

2331

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

2332

2018

2333

2019

options = parser.parse_args()

2334

2020

2343

2029

"port": "",

2344

2030

"debug": "False",

2345

2031

"priority":

2346

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

2032

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

2347

2033

"servicename": "Mandos",

2348

2034

"use_dbus": "True",

2349

2035

"use_ipv6": "True",

2350

2036

"debuglevel": "",

2351

2037

"restore": "True",

2352

"socket": "",

2353

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

2354

"foreground": "False",

2038

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

2355

2039

}

2356

2040

2357

2041

# Parse config file for server-global settings

2362

2046

# Convert the SafeConfigParser object to a dict

2363

2047

server_settings = server_config.defaults()

2364

2048

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

2365

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

2049

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

2366

2050

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

2367

2051

option)

2368

2052

if server_settings["port"]:

2369

2053

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

2370

2054

"port")

2371

if server_settings["socket"]:

2372

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

2373

"socket")

2374

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

2375

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

2376

# happen with a supplied network socket.

2377

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

2378

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

2379

["socket"])

2380

2055

del server_config

2381

2056

2382

2057

# Override the settings from the config file with command line

2384

2059

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

2385

2060

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

2386

2061

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

2387

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

2062

"statedir"):

2388

2063

value = getattr(options, option)

2389

2064

if value is not None:

2390

2065

server_settings[option] = value

2393

2068

for option in server_settings.keys():

2394

2069

if type(server_settings[option]) is str:

2395

2070

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

2396

# Force all boolean options to be boolean

2397

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

2398

"foreground"):

2399

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

2400

# Debug implies foreground

2401

if server_settings["debug"]:

2402

server_settings["foreground"] = True

2403

2071

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

2404

2072

2405

2073

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

2411

2079

use_ipv6 = server_settings["use_ipv6"]

2412

2080

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

2413

2081

stored_state_file)

2414

foreground = server_settings["foreground"]

2415

2082

2416

2083

if debug:

2417

2084

initlogger(debug, logging.DEBUG)

2424

2091

2425

2092

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

2426

2093

syslogger.setFormatter(logging.Formatter

2427

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

2428

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

2429

.format(server_settings

2430

["servicename"])))

2094

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

2095

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

2096

% server_settings["servicename"]))

2431

2097

2432

2098

# Parse config file with clients

2433

2099

client_config = configparser.SafeConfigParser(Client

2446

2112

use_ipv6=use_ipv6,

2447

2113

gnutls_priority=

2448

2114

server_settings["priority"],

2449

use_dbus=use_dbus,

2450

socketfd=(server_settings["socket"]

2451

or None))

2452

if not foreground:

2453

pidfilename = "/run/mandos.pid"

2454

pidfile = None

2115

use_dbus=use_dbus)

2116

if not debug:

2117

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

2455

2118

try:

2456

2119

pidfile = open(pidfilename, "w")

2457

except IOError as e:

2458

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

2459

exc_info=e)

2120

except IOError:

2121

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

2460

2122

2461

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

2123

try:

2124

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

2125

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

2126

except KeyError:

2462

2127

try:

2463

uid = pwd.getpwnam(name).pw_uid

2464

gid = pwd.getpwnam(name).pw_gid

2465

break

2128

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

2129

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

2466

2130

except KeyError:

2467

continue

2468

else:

2469

uid = 65534

2470

gid = 65534

2131

try:

2132

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

2133

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

2134

except KeyError:

2135

uid = 65534

2136

gid = 65534

2471

2137

try:

2472

2138

os.setgid(gid)

2473

2139

os.setuid(uid)

2474

2140

except OSError as error:

2475

if error.errno != errno.EPERM:

2141

if error[0] != errno.EPERM:

2476

2142

raise error

2477

2143

2478

2144

if debug:

2490

2156

.gnutls_global_set_log_function(debug_gnutls))

2491

2157

2492

2158

# Redirect stdin so all checkers get /dev/null

2493

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

2159

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

2494

2160

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

2495

2161

if null > 2:

2496

2162

os.close(null)

2497

2163

2498

2164

# Need to fork before connecting to D-Bus

2499

if not foreground:

2165

if not debug:

2500

2166

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

2501

2167

daemon()

2502

2168

2503

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

2504

# need to inform gobject that threads will be used.

2505

2169

gobject.threads_init()

2506

2170

2507

2171

global main_loop

2508

2172

# From the Avahi example code

2509

DBusGMainLoop(set_as_default=True)

2173

DBusGMainLoop(set_as_default=True )

2510

2174

main_loop = gobject.MainLoop()

2511

2175

bus = dbus.SystemBus()

2512

2176

# End of Avahi example code

2518

2182

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

2519

2183

do_not_queue=True))

2520

2184

except dbus.exceptions.NameExistsException as e:

2521

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

2185

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

2522

2186

use_dbus = False

2523

2187

server_settings["use_dbus"] = False

2524

2188

tcp_server.use_dbus = False

2536

2200

2537

2201

client_class = Client

2538

2202

if use_dbus:

2539

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

2203

client_class = functools.partial(ClientDBusTransitional,

2204

bus = bus)

2540

2205

2541

2206

client_settings = Client.config_parser(client_config)

2542

2207

old_client_settings = {}

2543

2208

clients_data = {}

2544

2209

2545

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

2546

global wnull

2547

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

2548

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

2549

# mode

2550

if debug or not foreground:

2551

wnull.close()

2552

2553

2210

# Get client data and settings from last running state.

2554

2211

if server_settings["restore"]:

2555

2212

try:

2558

2215

(stored_state))

2559

2216

os.remove(stored_state_path)

2560

2217

except IOError as e:

2561

if e.errno == errno.ENOENT:

2562

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

2563

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

2564

else:

2565

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

2566

exc_info=e)

2218

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

2219

.format(e))

2220

if e.errno != errno.ENOENT:

2567

2221

raise

2568

2222

except EOFError as e:

2569

2223

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

2570

"EOFError:", exc_info=e)

2224

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

2571

2225

2572

2226

with PGPEngine() as pgp:

2573

2227

for client_name, client in clients_data.iteritems():

2574

# Skip removed clients

2575

if client_name not in client_settings:

2576

continue

2577

2578

2228

# Decide which value to use after restoring saved state.

2579

2229

# We have three different values: Old config file,

2580

2230

# new config file, and saved state.

2630

2280

.format(client_name))

2631

2281

client["secret"] = (

2632

2282

client_settings[client_name]["secret"])

2283

2633

2284

2634

2285

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

2635

2286

for client_name in (set(old_client_settings)

2638

2289

for client_name in (set(client_settings)

2639

2290

- set(old_client_settings)):

2640

2291

clients_data[client_name] = client_settings[client_name]

2641

2292

2642

2293

# Create all client objects

2643

2294

for client_name, client in clients_data.iteritems():

2644

2295

tcp_server.clients[client_name] = client_class(

2645

name = client_name, settings = client,

2646

server_settings = server_settings)

2296

name = client_name, settings = client)

2647

2297

2648

2298

if not tcp_server.clients:

2649

2299

logger.warning("No clients defined")

2650

2651

if not foreground:

2652

if pidfile is not None:

2653

try:

2654

with pidfile:

2655

pid = os.getpid()

2656

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

2657

except IOError:

2658

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

2659

pidfilename, pid)

2660

del pidfile

2300

2301

if not debug:

2302

try:

2303

with pidfile:

2304

pid = os.getpid()

2305

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

2306

del pidfile

2307

except IOError:

2308

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

2309

pidfilename, pid)

2310

except NameError:

2311

# "pidfile" was never created

2312

pass

2661

2313

del pidfilename

2314

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

2662

2315

2663

2316

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

2664

2317

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

2665

2318

2666

2319

if use_dbus:

2667

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

2668

"se.bsnet.fukt.Mandos"})

2669

class MandosDBusService(DBusObjectWithProperties):

2320

class MandosDBusService(dbus.service.Object):

2670

2321

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

2671

2322

def __init__(self):

2672

2323

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

2673

2324

_interface = "se.recompile.Mandos"

2674

2325

2675

@dbus_interface_annotations(_interface)

2676

def _foo(self):

2677

return { "org.freedesktop.DBus.Property"

2678

".EmitsChangedSignal":

2679

"false"}

2680

2681

2326

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

2682

2327

def ClientAdded(self, objpath):

2683

2328

"D-Bus signal"

2725

2370

2726

2371

del _interface

2727

2372

2728

mandos_dbus_service = MandosDBusService()

2373

class MandosDBusServiceTransitional(MandosDBusService):

2374

__metaclass__ = AlternateDBusNamesMetaclass

2375

mandos_dbus_service = MandosDBusServiceTransitional()

2729

2376

2730

2377

def cleanup():

2731

2378

"Cleanup function; run on exit"

2732

2379

service.cleanup()

2733

2380

2734

2381

multiprocessing.active_children()

2735

wnull.close()

2736

2382

if not (tcp_server.clients or client_settings):

2737

2383

return

2738

2384

2750

2396

# A list of attributes that can not be pickled

2751

2397

# + secret.

2752

2398

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

2753

"checker", "server_settings"))

2399

"checker"))

2754

2400

for name, typ in (inspect.getmembers

2755

2401

(dbus.service.Object)):

2756

2402

exclude.add(name)

2765

2411

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

2766

2412

2767

2413

try:

2768

with (tempfile.NamedTemporaryFile

2769

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

2770

dir=os.path.dirname(stored_state_path),

2771

delete=False)) as stored_state:

2414

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

2415

prefix="clients-",

2416

dir=os.path.dirname

2417

(stored_state_path))

2418

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

2772

2419

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

2773

tempname=stored_state.name

2774

2420

os.rename(tempname, stored_state_path)

2775

2421

except (IOError, OSError) as e:

2422

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

2423

.format(e))

2776

2424

if not debug:

2777

2425

try:

2778

2426

os.remove(tempname)

2779

2427

except NameError:

2780

2428

pass

2781

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

2782

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

2783

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

2784

else:

2785

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

2786

exc_info=e)

2429

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

2430

errno.EEXIST)):

2787

2431

raise e

2788

2432

2789

2433

# Delete all clients, and settings from config

2817

2461

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

2818

2462

if use_ipv6:

2819

2463

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

2820

" flowinfo %d, scope_id %d",

2821

*tcp_server.socket.getsockname())

2464

" flowinfo %d, scope_id %d"

2465

% tcp_server.socket.getsockname())

2822

2466

else: # IPv4

2823

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

2824

*tcp_server.socket.getsockname())

2467

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

2468

% tcp_server.socket.getsockname())

2825

2469

2826

2470

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

2827

2471

2830

2474

try:

2831

2475

service.activate()

2832

2476

except dbus.exceptions.DBusException as error:

2833

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

2477

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

2834

2478

cleanup()

2835

2479

sys.exit(1)

2836

2480

# End of Avahi example code

2843

2487

logger.debug("Starting main loop")

2844

2488

main_loop.run()

2845

2489

except AvahiError as error:

2846

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

2490

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

2847

2491

cleanup()

2848

2492

sys.exit(1)

2849

2493

except KeyboardInterrupt: