/mandos/trunk : revision 549

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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 = "1.5.0"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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class PGPEngine(object):

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

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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

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

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self._cleanup()

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return False

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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class AvahiError(Exception):

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

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self.value = value

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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

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

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% self.name))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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checker, or None.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"extended_timeout": "15m",

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"interval": "2m",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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% section)

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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client["last_checker_status"] = None

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return settings

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

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

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

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

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attribute."""

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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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else:

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self.last_enabled = None

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self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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

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# Already enabled

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return

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self.send_changedstate()

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

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

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if not quiet:

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self.send_changedstate()

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if not quiet:

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

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

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

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

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

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

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

611

if not quiet:

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self.send_changedstate()

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

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return False

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def init_checker(self):

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

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600

# and every interval from then on.

622

if self.checker_initiator_tag is not None:

623

gobject.source_remove(self.checker_initiator_tag)

624

601

self.checker_initiator_tag = (gobject.timeout_add

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(self.interval_milliseconds(),

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603

self.start_checker))

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

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

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605

self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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607

self.disable))

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

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vars(self))

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def checked_ok(self):

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

656

self.last_checked_ok = datetime.datetime.utcnow()

657

self.last_checker_status = 0

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self.bump_timeout()

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def bump_timeout(self, timeout=None):

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

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def checked_ok(self, timeout=None):

630

"""Bump up the timeout for this client.

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632

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

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alive and well.

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"""

662

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if timeout is None:

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timeout = self.timeout

637

self.last_checked_ok = datetime.datetime.utcnow()

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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

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641

self.disable_initiator_tag = (gobject.timeout_add

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642

(timedelta_to_milliseconds

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652

If a checker already exists, leave it running and do

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653

nothing."""

681

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

682

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

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

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# would inevitably timeout, since no checker would get a

685

# 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

686

659

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

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660

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

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# should be.

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self.current_checker_command)

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# Start a new checker if needed

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677

if self.checker is None:

705

# Escape attributes for the shell

706

escaped_attrs = dict(

707

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

708

for attr in

709

self.runtime_expansions)

710

678

try:

711

command = self.checker_command % escaped_attrs

712

except TypeError as error:

713

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

714

self.checker_command, exc_info=error)

715

return True # Try again later

679

# In case checker_command has exactly one % operator

680

command = self.checker_command % self.host

681

except TypeError:

682

# Escape attributes for the shell

683

escaped_attrs = dict(

684

(attr,

685

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

686

errors=

687

'replace')))

688

for attr in

689

self.runtime_expansions)

690

691

try:

692

command = self.checker_command % escaped_attrs

693

except TypeError as error:

694

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

695

' %s', self.checker_command, error)

696

return True # Try again later

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697

self.current_checker_command = command

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698

try:

718

699

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

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702

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

722

703

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

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704

# always replaced by /dev/null.)

724

# The exception is when not debugging but nevertheless

725

# running in the foreground; use the previously

726

# created wnull.

727

popen_args = {}

728

if (not self.server_settings["debug"]

729

and self.server_settings["foreground"]):

730

popen_args.update({"stdout": wnull,

731

"stderr": wnull })

732

705

self.checker = subprocess.Popen(command,

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706

close_fds=True,

734

shell=True, cwd="/",

735

**popen_args)

736

except OSError as error:

737

logger.error("Failed to start subprocess",

738

exc_info=error)

739

return True

740

self.checker_callback_tag = (gobject.child_watch_add

741

(self.checker.pid,

742

self.checker_callback,

743

data=command))

744

# The checker may have completed before the gobject

745

# watch was added. Check for this.

746

try:

707

shell=True, cwd="/")

708

self.checker_callback_tag = (gobject.child_watch_add

709

(self.checker.pid,

710

self.checker_callback,

711

data=command))

712

# The checker may have completed before the gobject

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# watch was added. Check for this.

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

715

if pid:

716

gobject.source_remove(self.checker_callback_tag)

717

self.checker_callback(pid, status, command)

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except OSError as error:

749

if error.errno == errno.ECHILD:

750

# This should never happen

751

logger.error("Child process vanished",

752

exc_info=error)

753

return True

754

raise

755

if pid:

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gobject.source_remove(self.checker_callback_tag)

757

self.checker_callback(pid, status, command)

719

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

720

error)

758

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

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722

return True

760

723

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730

return

768

731

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

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732

try:

770

self.checker.terminate()

733

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

771

734

#time.sleep(0.5)

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735

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

773

# self.checker.kill()

736

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

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737

except OSError as error:

775

738

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

776

739

raise

793

756

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

794

757

if byte_arrays and signature != "ay":

795

758

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

796

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

759

" signature %r" % signature)

797

760

def decorator(func):

798

761

func._dbus_is_property = True

799

762

func._dbus_interface = dbus_interface

807

770

return decorator

808

771

809

772

810

def dbus_interface_annotations(dbus_interface):

811

"""Decorator for marking functions returning interface annotations

812

813

Usage:

814

815

@dbus_interface_annotations("org.example.Interface")

816

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

817

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

818

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

819

"false"}

820

"""

821

def decorator(func):

822

func._dbus_is_interface = True

823

func._dbus_interface = dbus_interface

824

func._dbus_name = dbus_interface

825

return func

826

return decorator

827

828

829

def dbus_annotations(annotations):

830

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

831

Usage:

832

833

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

834

access="r")

835

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

836

"org.freedesktop.DBus.Property."

837

"EmitsChangedSignal": "false"})

838

def Property_dbus_property(self):

839

return dbus.Boolean(False)

840

"""

841

def decorator(func):

842

func._dbus_annotations = annotations

843

return func

844

return decorator

845

846

847

773

class DBusPropertyException(dbus.exceptions.DBusException):

848

774

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

849

775

"""

872

798

"""

873

799

874

800

@staticmethod

875

def _is_dbus_thing(thing):

876

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

877

878

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

879

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

880

"""

881

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

882

False)

801

def _is_dbus_property(obj):

802

return getattr(obj, "_dbus_is_property", False)

883

803

884

def _get_all_dbus_things(self, thing):

804

def _get_all_dbus_properties(self):

885

805

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

886

806

"""

887

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

888

name),

889

athing.__get__(self))

807

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

890

808

for cls in self.__class__.__mro__

891

for name, athing in

892

inspect.getmembers(cls,

893

self._is_dbus_thing(thing)))

809

for name, prop in

810

inspect.getmembers(cls, self._is_dbus_property))

894

811

895

812

def _get_dbus_property(self, interface_name, property_name):

896

813

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

898

815

"""

899

816

for cls in self.__class__.__mro__:

900

817

for name, value in (inspect.getmembers

901

(cls,

902

self._is_dbus_thing("property"))):

818

(cls, self._is_dbus_property)):

903

819

if (value._dbus_name == property_name

904

820

and value._dbus_interface == interface_name):

905

821

return value.__get__(self)

947

863

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

948

864

"""

949

865

properties = {}

950

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

866

for name, prop in self._get_all_dbus_properties():

951

867

if (interface_name

952

868

and interface_name != prop._dbus_interface):

953

869

# Interface non-empty but did not match

968

884

path_keyword='object_path',

969

885

connection_keyword='connection')

970

886

def Introspect(self, object_path, connection):

971

"""Overloading of standard D-Bus method.

972

973

Inserts property tags and interface annotation tags.

887

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

974

888

"""

975

889

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

976

890

connection)

983

897

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

984

898

return e

985

899

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

986

# Add property tags

987

900

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

988

901

for name, prop

989

in self._get_all_dbus_things("property")

902

in self._get_all_dbus_properties()

990

903

if prop._dbus_interface

991

904

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

992

905

if_tag.appendChild(tag)

993

# Add annotation tags

994

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

995

for tag in if_tag.getElementsByTagName(typ):

996

annots = dict()

997

for name, prop in (self.

998

_get_all_dbus_things(typ)):

999

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

1000

and prop._dbus_interface

1001

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

1002

annots.update(getattr

1003

(prop,

1004

"_dbus_annotations",

1005

{}))

1006

for name, value in annots.iteritems():

1007

ann_tag = document.createElement(

1008

"annotation")

1009

ann_tag.setAttribute("name", name)

1010

ann_tag.setAttribute("value", value)

1011

tag.appendChild(ann_tag)

1012

# Add interface annotation tags

1013

for annotation, value in dict(

1014

itertools.chain.from_iterable(

1015

annotations().iteritems()

1016

for name, annotations in

1017

self._get_all_dbus_things("interface")

1018

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

1019

)).iteritems():

1020

ann_tag = document.createElement("annotation")

1021

ann_tag.setAttribute("name", annotation)

1022

ann_tag.setAttribute("value", value)

1023

if_tag.appendChild(ann_tag)

1024

906

# Add the names to the return values for the

1025

907

# "org.freedesktop.DBus.Properties" methods

1026

908

if (if_tag.getAttribute("name")

1041

923

except (AttributeError, xml.dom.DOMException,

1042

924

xml.parsers.expat.ExpatError) as error:

1043

925

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

1044

exc_info=error)

926

error)

1045

927

return xmlstring

1046

928

1047

929

1048

def datetime_to_dbus(dt, variant_level=0):

930

def datetime_to_dbus (dt, variant_level=0):

1049

931

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

1050

932

if dt is None:

1051

933

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

1053

935

variant_level=variant_level)

1054

936

1055

937

1056

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1057

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

1058

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

1059

interface names according to the "alt_interface_names" mapping.

1060

Usage:

1061

1062

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

1063

"net.example.AlternateInterface"})

1064

class SampleDBusObject(dbus.service.Object):

1065

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

1066

def SampleDBusMethod():

1067

pass

1068

1069

The above "SampleDBusMethod" on "SampleDBusObject" will be

1070

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

1071

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

1072

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

1073

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

1074

1075

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

1076

(from DBusObjectWithProperties) and interfaces (from the

1077

dbus_interface_annotations decorator).

938

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

939

.__metaclass__):

940

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

941

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

1078

942

"""

1079

def wrapper(cls):

1080

for orig_interface_name, alt_interface_name in (

1081

alt_interface_names.iteritems()):

1082

attr = {}

1083

interface_names = set()

1084

# Go though all attributes of the class

1085

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

943

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

944

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

945

# methods, signals, or properties in them

946

for base in (b for b in bases

947

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

948

# Go though all attributes of the base class

949

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

1086

950

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

1087

951

# with the wrong interface name

1088

952

if (not hasattr(attribute, "_dbus_interface")

1089

953

or not attribute._dbus_interface

1090

.startswith(orig_interface_name)):

954

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

1091

955

continue

1092

956

# Create an alternate D-Bus interface name based on

1093

957

# the current name

1094

958

alt_interface = (attribute._dbus_interface

1095

.replace(orig_interface_name,

1096

alt_interface_name))

1097

interface_names.add(alt_interface)

959

.replace("se.recompile.Mandos",

960

"se.bsnet.fukt.Mandos"))

1098

961

# Is this a D-Bus signal?

1099

962

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

1100

# Extract the original non-method undecorated

1101

# function by black magic

963

# Extract the original non-method function by

964

# black magic

1102

965

nonmethod_func = (dict(

1103

966

zip(attribute.func_code.co_freevars,

1104

967

attribute.__closure__))["func"]

1115

978

nonmethod_func.func_name,

1116

979

nonmethod_func.func_defaults,

1117

980

nonmethod_func.func_closure)))

1118

# Copy annotations, if any

1119

try:

1120

new_function._dbus_annotations = (

1121

dict(attribute._dbus_annotations))

1122

except AttributeError:

1123

pass

1124

981

# Define a creator of a function to call both the

1125

# original and alternate functions, so both the

1126

# original and alternate signals gets sent when

1127

# the function is called

982

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

983

# signals gets sent when the function is called

1128

984

def fixscope(func1, func2):

1129

985

"""This function is a scope container to pass

1130

986

func1 and func2 to the "call_both" function

1137

993

return call_both

1138

994

# Create the "call_both" function and add it to

1139

995

# the class

1140

attr[attrname] = fixscope(attribute, new_function)

996

attr[attrname] = fixscope(attribute,

997

new_function)

1141

998

# Is this a D-Bus method?

1142

999

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

1143

1000

# Create a new, but exactly alike, function

1154

1011

attribute.func_name,

1155

1012

attribute.func_defaults,

1156

1013

attribute.func_closure)))

1157

# Copy annotations, if any

1158

try:

1159

attr[attrname]._dbus_annotations = (

1160

dict(attribute._dbus_annotations))

1161

except AttributeError:

1162

pass

1163

1014

# Is this a D-Bus property?

1164

1015

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

1165

1016

# Create a new, but exactly alike, function

1179

1030

attribute.func_name,

1180

1031

attribute.func_defaults,

1181

1032

attribute.func_closure)))

1182

# Copy annotations, if any

1183

try:

1184

attr[attrname]._dbus_annotations = (

1185

dict(attribute._dbus_annotations))

1186

except AttributeError:

1187

pass

1188

# Is this a D-Bus interface?

1189

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

1190

# Create a new, but exactly alike, function

1191

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

1192

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

1193

# to the class.

1194

attr[attrname] = (dbus_interface_annotations

1195

(alt_interface)

1196

(types.FunctionType

1197

(attribute.func_code,

1198

attribute.func_globals,

1199

attribute.func_name,

1200

attribute.func_defaults,

1201

attribute.func_closure)))

1202

if deprecate:

1203

# Deprecate all alternate interfaces

1204

iname="_AlternateDBusNames_interface_annotation{0}"

1205

for interface_name in interface_names:

1206

@dbus_interface_annotations(interface_name)

1207

def func(self):

1208

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

1209

"true" }

1210

# Find an unused name

1211

for aname in (iname.format(i)

1212

for i in itertools.count()):

1213

if aname not in attr:

1214

attr[aname] = func

1215

break

1216

if interface_names:

1217

# Replace the class with a new subclass of it with

1218

# methods, signals, etc. as created above.

1219

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

1220

(cls,), attr)

1221

return cls

1222

return wrapper

1223

1224

1225

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

1226

"se.bsnet.fukt.Mandos"})

1033

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

1034

1035

1227

1036

class ClientDBus(Client, DBusObjectWithProperties):

1228

1037

"""A Client class using D-Bus

1229

1038

1240

1049

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

1241

1050

self.bus = bus

1242

1051

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

1052

self._approvals_pending = 0

1053

1054

self._approvals_pending = 0

1243

1055

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

1244

1056

# the D-Bus

1245

1057

client_object_name = unicode(self.name).translate(

1249

1061

("/clients/" + client_object_name))

1250

1062

DBusObjectWithProperties.__init__(self, self.bus,

1251

1063

self.dbus_object_path)

1252

1064

1253

1065

def notifychangeproperty(transform_func,

1254

1066

dbus_name, type_func=lambda x: x,

1255

1067

variant_level=1):

1278

1090

1279

1091

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

1280

1092

1093

1281

1094

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1282

1095

approvals_pending = notifychangeproperty(dbus.Boolean,

1283

1096

"ApprovalPending",

1290

1103

checker is not None)

1291

1104

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1292

1105

"LastCheckedOK")

1293

last_checker_status = notifychangeproperty(dbus.Int16,

1294

"LastCheckerStatus")

1295

1106

last_approval_request = notifychangeproperty(

1296

1107

datetime_to_dbus, "LastApprovalRequest")

1297

1108

approved_by_default = notifychangeproperty(dbus.Boolean,

1365

1176

return False

1366

1177

1367

1178

def approve(self, value=True):

1179

self.send_changedstate()

1368

1180

self.approved = value

1369

1181

gobject.timeout_add(timedelta_to_milliseconds

1370

1182

(self.approval_duration),

1371

1183

self._reset_approved)

1372

self.send_changedstate()

1184

1373

1185

1374

1186

## D-Bus methods, signals & properties

1375

1187

_interface = "se.recompile.Mandos.Client"

1376

1188

1377

## Interfaces

1378

1379

@dbus_interface_annotations(_interface)

1380

def _foo(self):

1381

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

1382

"false"}

1383

1384

1189

## Signals

1385

1190

1386

1191

# CheckerCompleted - signal

1422

1227

"D-Bus signal"

1423

1228

return self.need_approval()

1424

1229

1230

# NeRwequest - signal

1231

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

1232

def NewRequest(self, ip):

1233

"""D-Bus signal

1234

Is sent after a client request a password.

1235

"""

1236

pass

1237

1425

1238

## Methods

1426

1239

1427

1240

# Approve - method

1537

1350

return

1538

1351

return datetime_to_dbus(self.last_checked_ok)

1539

1352

1540

# LastCheckerStatus - property

1541

@dbus_service_property(_interface, signature="n",

1542

access="read")

1543

def LastCheckerStatus_dbus_property(self):

1544

return dbus.Int16(self.last_checker_status)

1545

1546

1353

# Expires - property

1547

1354

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

1548

1355

def Expires_dbus_property(self):

1559

1366

def Timeout_dbus_property(self, value=None):

1560

1367

if value is None: # get

1561

1368

return dbus.UInt64(self.timeout_milliseconds())

1562

old_timeout = self.timeout

1563

1369

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

1564

# Reschedule disabling

1370

# Reschedule timeout

1565

1371

if self.enabled:

1566

1372

now = datetime.datetime.utcnow()

1567

self.expires += self.timeout - old_timeout

1568

if self.expires <= now:

1373

time_to_die = timedelta_to_milliseconds(

1374

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

1375

if time_to_die <= 0:

1569

1376

# The timeout has passed

1570

1377

self.disable()

1571

1378

else:

1379

self.expires = (now +

1380

datetime.timedelta(milliseconds =

1381

time_to_die))

1572

1382

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

1573

1383

is None):

1574

1384

return

1575

1385

gobject.source_remove(self.disable_initiator_tag)

1576

self.disable_initiator_tag = (

1577

gobject.timeout_add(

1578

timedelta_to_milliseconds(self.expires - now),

1579

self.disable))

1386

self.disable_initiator_tag = (gobject.timeout_add

1387

(time_to_die,

1388

self.disable))

1580

1389

1581

1390

# ExtendedTimeout - property

1582

1391

@dbus_service_property(_interface, signature="t",

1661

1470

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

1662

1471

1663

1472

1473

class ClientDBusTransitional(ClientDBus):

1474

__metaclass__ = AlternateDBusNamesMetaclass

1475

1476

1664

1477

class ClientHandler(socketserver.BaseRequestHandler, object):

1665

1478

"""A class to handle client connections.

1666

1479

1734

1547

except KeyError:

1735

1548

return

1736

1549

1550

if self.server.use_dbus:

1551

# Emit D-Bus signal

1552

client.NewRequest(str(self.client_address))

1553

1737

1554

if client.approval_delay:

1738

1555

delay = client.approval_delay

1739

1556

client.approvals_pending += 1

1770

1587

#wait until timeout or approved

1771

1588

time = datetime.datetime.now()

1772

1589

client.changedstate.acquire()

1773

client.changedstate.wait(

1774

float(timedelta_to_milliseconds(delay)

1775

/ 1000))

1590

(client.changedstate.wait

1591

(float(client.timedelta_to_milliseconds(delay)

1592

/ 1000)))

1776

1593

client.changedstate.release()

1777

1594

time2 = datetime.datetime.now()

1778

1595

if (time2 - time) >= delay:

1794

1611

try:

1795

1612

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

1796

1613

except gnutls.errors.GNUTLSError as error:

1797

logger.warning("gnutls send failed",

1798

exc_info=error)

1614

logger.warning("gnutls send failed")

1799

1615

return

1800

1616

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

1801

1617

sent, len(client.secret)

1804

1620

1805

1621

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

1806

1622

# bump the timeout using extended_timeout

1807

client.bump_timeout(client.extended_timeout)

1623

client.checked_ok(client.extended_timeout)

1808

1624

if self.server.use_dbus:

1809

1625

# Emit D-Bus signal

1810

1626

client.GotSecret()

1815

1631

try:

1816

1632

session.bye()

1817

1633

except gnutls.errors.GNUTLSError as error:

1818

logger.warning("GnuTLS bye failed",

1819

exc_info=error)

1634

logger.warning("GnuTLS bye failed")

1820

1635

1821

1636

@staticmethod

1822

1637

def peer_certificate(session):

1894

1709

def process_request(self, request, address):

1895

1710

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

1896

1711

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

1897

args = (request, address))

1712

args = (request,

1713

address))

1898

1714

proc.start()

1899

1715

return proc

1900

1716

1928

1744

use_ipv6: Boolean; to use IPv6 or not

1929

1745

"""

1930

1746

def __init__(self, server_address, RequestHandlerClass,

1931

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

1932

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

1933

creating a new one with socket.socket().

1934

"""

1747

interface=None, use_ipv6=True):

1935

1748

self.interface = interface

1936

1749

if use_ipv6:

1937

1750

self.address_family = socket.AF_INET6

1938

if socketfd is not None:

1939

# Save the file descriptor

1940

self.socketfd = socketfd

1941

# Save the original socket.socket() function

1942

self.socket_socket = socket.socket

1943

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

1944

#

1945

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

1946

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

1947

# patching socket.socket.)

1948

#

1949

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

1950

@functools.wraps(socket.socket)

1951

def socket_wrapper(*args, **kwargs):

1952

# Restore original function so subsequent calls are

1953

# not affected.

1954

socket.socket = self.socket_socket

1955

del self.socket_socket

1956

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

1957

# saved file descriptor.

1958

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

1959

# Replace socket.socket() function with wrapper

1960

socket.socket = socket_wrapper

1961

# The socketserver.TCPServer.__init__ will call

1962

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

1963

# socket_wrapper(), if socketfd was set.

1964

1751

socketserver.TCPServer.__init__(self, server_address,

1965

1752

RequestHandlerClass)

1966

1967

1753

def server_bind(self):

1968

1754

"""This overrides the normal server_bind() function

1969

1755

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

1977

1763

try:

1978

1764

self.socket.setsockopt(socket.SOL_SOCKET,

1979

1765

SO_BINDTODEVICE,

1980

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

1766

str(self.interface

1767

+ '\0'))

1981

1768

except socket.error as error:

1982

if error.errno == errno.EPERM:

1983

logger.error("No permission to bind to"

1984

" interface %s", self.interface)

1985

elif error.errno == errno.ENOPROTOOPT:

1769

if error[0] == errno.EPERM:

1770

logger.error("No permission to"

1771

" bind to interface %s",

1772

self.interface)

1773

elif error[0] == errno.ENOPROTOOPT:

1986

1774

logger.error("SO_BINDTODEVICE not available;"

1987

1775

" cannot bind to interface %s",

1988

1776

self.interface)

1989

elif error.errno == errno.ENODEV:

1990

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

1991

" cannot bind", self.interface)

1992

1777

else:

1993

1778

raise

1994

1779

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

1997

1782

if self.address_family == socket.AF_INET6:

1998

1783

any_address = "::" # in6addr_any

1999

1784

else:

2000

any_address = "0.0.0.0" # INADDR_ANY

1785

any_address = socket.INADDR_ANY

2001

1786

self.server_address = (any_address,

2002

1787

self.server_address[1])

2003

1788

elif not self.server_address[1]:

2024

1809

"""

2025

1810

def __init__(self, server_address, RequestHandlerClass,

2026

1811

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

2027

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

1812

gnutls_priority=None, use_dbus=True):

2028

1813

self.enabled = False

2029

1814

self.clients = clients

2030

1815

if self.clients is None:

2034

1819

IPv6_TCPServer.__init__(self, server_address,

2035

1820

RequestHandlerClass,

2036

1821

interface = interface,

2037

use_ipv6 = use_ipv6,

2038

socketfd = socketfd)

1822

use_ipv6 = use_ipv6)

2039

1823

def server_activate(self):

2040

1824

if self.enabled:

2041

1825

return socketserver.TCPServer.server_activate(self)

2054

1838

2055

1839

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

2056

1840

proc = None, client_object=None):

1841

condition_names = {

1842

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

1843

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

1844

# blocking).

1845

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

1846

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

1847

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

1848

# broken, usually for pipes and

1849

# sockets).

1850

}

1851

conditions_string = ' | '.join(name

1852

for cond, name in

1853

condition_names.iteritems()

1854

if cond & condition)

2057

1855

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

2058

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

1856

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

2059

1857

# Wait for other process to exit

2060

1858

proc.join()

2061

1859

return False

2119

1917

return True

2120

1918

2121

1919

2122

def rfc3339_duration_to_delta(duration):

2123

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

2124

2125

>>> rfc3339_duration_to_delta("P7D")

2126

datetime.timedelta(7)

2127

>>> rfc3339_duration_to_delta("PT60S")

2128

datetime.timedelta(0, 60)

2129

>>> rfc3339_duration_to_delta("PT60M")

2130

datetime.timedelta(0, 3600)

2131

>>> rfc3339_duration_to_delta("PT24H")

2132

datetime.timedelta(1)

2133

>>> rfc3339_duration_to_delta("P1W")

2134

datetime.timedelta(7)

2135

>>> rfc3339_duration_to_delta("PT5M30S")

2136

datetime.timedelta(0, 330)

2137

>>> rfc3339_duration_to_delta("P1DT3M20S")

2138

datetime.timedelta(1, 200)

2139

"""

2140

2141

# Parsing an RFC 3339 duration with regular expressions is not

2142

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

2143

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

2144

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

2145

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

2146

# avoid excessive use of external libraries.

2147

2148

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

2149

Token = collections.namedtuple("Token",

2150

("regexp", # To match token; if

2151

# "value" is not None,

2152

# must have a "group"

2153

# containing digits

2154

"value", # datetime.timedelta or

2155

# None

2156

"followers")) # Tokens valid after

2157

# this token

2158

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

2159

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

2160

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

2161

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

2162

datetime.timedelta(seconds=1),

2163

frozenset((token_end,)))

2164

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

2165

datetime.timedelta(minutes=1),

2166

frozenset((token_second, token_end)))

2167

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

2168

datetime.timedelta(hours=1),

2169

frozenset((token_minute, token_end)))

2170

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

2171

None,

2172

frozenset((token_hour, token_minute,

2173

token_second)))

2174

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

2175

datetime.timedelta(days=1),

2176

frozenset((token_time, token_end)))

2177

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

2178

datetime.timedelta(weeks=4),

2179

frozenset((token_day, token_end)))

2180

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

2181

datetime.timedelta(weeks=52),

2182

frozenset((token_month, token_end)))

2183

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

2184

datetime.timedelta(weeks=1),

2185

frozenset((token_end,)))

2186

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

2187

frozenset((token_year, token_month,

2188

token_day, token_time,

2189

token_week))),

2190

# Define starting values

2191

value = datetime.timedelta() # Value so far

2192

found_token = None

2193

followers = frozenset(token_duration,) # Following valid tokens

2194

s = duration # String left to parse

2195

# Loop until end token is found

2196

while found_token is not token_end:

2197

# Search for any currently valid tokens

2198

for token in followers:

2199

match = token.regexp.match(s)

2200

if match is not None:

2201

# Token found

2202

if token.value is not None:

2203

# Value found, parse digits

2204

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

2205

# Add to value so far

2206

value += factor * token.value

2207

# Strip token from string

2208

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

2209

# Go to found token

2210

found_token = token

2211

# Set valid next tokens

2212

followers = found_token.followers

2213

break

2214

else:

2215

# No currently valid tokens were found

2216

raise ValueError("Invalid RFC 3339 duration")

2217

# End token found

2218

return value

2219

2220

2221

1920

def string_to_delta(interval):

2222

1921

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

2223

1922

2234

1933

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

2235

1934

datetime.timedelta(0, 330)

2236

1935

"""

2237

2238

try:

2239

return rfc3339_duration_to_delta(interval)

2240

except ValueError:

2241

pass

2242

2243

1936

timevalue = datetime.timedelta(0)

2244

1937

for s in interval.split():

2245

1938

try:

2256

1949

elif suffix == "w":

2257

1950

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

2258

1951

else:

2259

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

2260

.format(suffix))

1952

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

2261

1953

except (ValueError, IndexError) as e:

2262

1954

raise ValueError(*(e.args))

2263

1955

timevalue += delta

2277

1969

sys.exit()

2278

1970

if not noclose:

2279

1971

# Close all standard open file descriptors

2280

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

1972

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

2281

1973

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

2282

1974

raise OSError(errno.ENODEV,

2283

"{0} not a character device"

2284

.format(os.devnull))

1975

"%s not a character device"

1976

% os.path.devnull)

2285

1977

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

2286

1978

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

2287

1979

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

2296

1988

2297

1989

parser = argparse.ArgumentParser()

2298

1990

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

2299

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

1991

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

2300

1992

help="show version number and exit")

2301

1993

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

2302

1994

help="Bind to interface IF")

2308

2000

help="Run self-test")

2309

2001

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

2310

2002

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

2311

" to terminal", default=None)

2003

" to terminal")

2312

2004

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

2313

2005

help="Debug level for stdout output")

2314

2006

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

2321

2013

" files")

2322

2014

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

2323

2015

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

2324

" system bus interface", default=None)

2016

" system bus interface")

2325

2017

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

2326

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

2327

default=None)

2018

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

2328

2019

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

2329

2020

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

2330

" state", default=None)

2331

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

2332

help="Specify a file descriptor to a network"

2333

" socket to use instead of creating one")

2021

" state")

2334

2022

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

2335

2023

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

2336

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

2337

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

2338

2024

2339

2025

options = parser.parse_args()

2340

2026

2349

2035

"port": "",

2350

2036

"debug": "False",

2351

2037

"priority":

2352

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

2038

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

2353

2039

"servicename": "Mandos",

2354

2040

"use_dbus": "True",

2355

2041

"use_ipv6": "True",

2356

2042

"debuglevel": "",

2357

2043

"restore": "True",

2358

"socket": "",

2359

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

2360

"foreground": "False",

2044

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

2361

2045

}

2362

2046

2363

2047

# Parse config file for server-global settings

2368

2052

# Convert the SafeConfigParser object to a dict

2369

2053

server_settings = server_config.defaults()

2370

2054

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

2371

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

2055

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

2372

2056

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

2373

2057

option)

2374

2058

if server_settings["port"]:

2375

2059

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

2376

2060

"port")

2377

if server_settings["socket"]:

2378

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

2379

"socket")

2380

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

2381

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

2382

# happen with a supplied network socket.

2383

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

2384

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

2385

["socket"])

2386

2061

del server_config

2387

2062

2388

2063

# Override the settings from the config file with command line

2390

2065

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

2391

2066

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

2392

2067

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

2393

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

2068

"statedir"):

2394

2069

value = getattr(options, option)

2395

2070

if value is not None:

2396

2071

server_settings[option] = value

2399

2074

for option in server_settings.keys():

2400

2075

if type(server_settings[option]) is str:

2401

2076

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

2402

# Force all boolean options to be boolean

2403

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

2404

"foreground"):

2405

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

2406

# Debug implies foreground

2407

if server_settings["debug"]:

2408

server_settings["foreground"] = True

2409

2077

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

2410

2078

2411

2079

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

2417

2085

use_ipv6 = server_settings["use_ipv6"]

2418

2086

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

2419

2087

stored_state_file)

2420

foreground = server_settings["foreground"]

2421

2088

2422

2089

if debug:

2423

2090

initlogger(debug, logging.DEBUG)

2430

2097

2431

2098

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

2432

2099

syslogger.setFormatter(logging.Formatter

2433

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

2434

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

2435

.format(server_settings

2436

["servicename"])))

2100

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

2101

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

2102

% server_settings["servicename"]))

2437

2103

2438

2104

# Parse config file with clients

2439

2105

client_config = configparser.SafeConfigParser(Client

2452

2118

use_ipv6=use_ipv6,

2453

2119

gnutls_priority=

2454

2120

server_settings["priority"],

2455

use_dbus=use_dbus,

2456

socketfd=(server_settings["socket"]

2457

or None))

2458

if not foreground:

2459

pidfilename = "/run/mandos.pid"

2460

pidfile = None

2121

use_dbus=use_dbus)

2122

if not debug:

2123

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

2461

2124

try:

2462

2125

pidfile = open(pidfilename, "w")

2463

except IOError as e:

2464

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

2465

exc_info=e)

2126

except IOError:

2127

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

2466

2128

2467

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

2129

try:

2130

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

2131

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

2132

except KeyError:

2468

2133

try:

2469

uid = pwd.getpwnam(name).pw_uid

2470

gid = pwd.getpwnam(name).pw_gid

2471

break

2134

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

2135

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

2472

2136

except KeyError:

2473

continue

2474

else:

2475

uid = 65534

2476

gid = 65534

2137

try:

2138

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

2139

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

2140

except KeyError:

2141

uid = 65534

2142

gid = 65534

2477

2143

try:

2478

2144

os.setgid(gid)

2479

2145

os.setuid(uid)

2480

2146

except OSError as error:

2481

if error.errno != errno.EPERM:

2147

if error[0] != errno.EPERM:

2482

2148

raise error

2483

2149

2484

2150

if debug:

2496

2162

.gnutls_global_set_log_function(debug_gnutls))

2497

2163

2498

2164

# Redirect stdin so all checkers get /dev/null

2499

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

2165

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

2500

2166

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

2501

2167

if null > 2:

2502

2168

os.close(null)

2503

2169

2504

2170

# Need to fork before connecting to D-Bus

2505

if not foreground:

2171

if not debug:

2506

2172

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

2507

2173

daemon()

2508

2174

2509

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

2510

# need to inform gobject that threads will be used.

2511

2175

gobject.threads_init()

2512

2176

2513

2177

global main_loop

2514

2178

# From the Avahi example code

2515

DBusGMainLoop(set_as_default=True)

2179

DBusGMainLoop(set_as_default=True )

2516

2180

main_loop = gobject.MainLoop()

2517

2181

bus = dbus.SystemBus()

2518

2182

# End of Avahi example code

2524

2188

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

2525

2189

do_not_queue=True))

2526

2190

except dbus.exceptions.NameExistsException as e:

2527

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

2191

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

2528

2192

use_dbus = False

2529

2193

server_settings["use_dbus"] = False

2530

2194

tcp_server.use_dbus = False

2542

2206

2543

2207

client_class = Client

2544

2208

if use_dbus:

2545

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

2209

client_class = functools.partial(ClientDBusTransitional,

2210

bus = bus)

2546

2211

2547

2212

client_settings = Client.config_parser(client_config)

2548

2213

old_client_settings = {}

2549

2214

clients_data = {}

2550

2215

2551

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

2552

global wnull

2553

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

2554

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

2555

# mode

2556

if debug or not foreground:

2557

wnull.close()

2558

2559

2216

# Get client data and settings from last running state.

2560

2217

if server_settings["restore"]:

2561

2218

try:

2564

2221

(stored_state))

2565

2222

os.remove(stored_state_path)

2566

2223

except IOError as e:

2567

if e.errno == errno.ENOENT:

2568

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

2569

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

2570

else:

2571

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

2572

exc_info=e)

2224

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

2225

.format(e))

2226

if e.errno != errno.ENOENT:

2573

2227

raise

2574

2228

except EOFError as e:

2575

2229

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

2576

"EOFError:", exc_info=e)

2230

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

2577

2231

2578

2232

with PGPEngine() as pgp:

2579

2233

for client_name, client in clients_data.iteritems():

2580

# Skip removed clients

2581

if client_name not in client_settings:

2582

continue

2583

2584

2234

# Decide which value to use after restoring saved state.

2585

2235

# We have three different values: Old config file,

2586

2236

# new config file, and saved state.

2600

2250

2601

2251

# Clients who has passed its expire date can still be

2602

2252

# enabled if its last checker was successful. Clients

2603

# whose checker succeeded before we stored its state is

2604

# assumed to have successfully run all checkers during

2605

# downtime.

2253

# whose checker failed before we stored its state is

2254

# assumed to have failed all checkers during downtime.

2606

2255

if client["enabled"]:

2607

2256

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

2608

2257

if not client["last_checked_ok"]:

2609

2258

logger.warning(

2610

2259

"disabling client {0} - Client never "

2611

"performed a successful checker"

2612

.format(client_name))

2260

"performed a successfull checker"

2261

.format(client["name"]))

2613

2262

client["enabled"] = False

2614

2263

elif client["last_checker_status"] != 0:

2615

2264

logger.warning(

2616

2265

"disabling client {0} - Client "

2617

2266

"last checker failed with error code {1}"

2618

.format(client_name,

2267

.format(client["name"],

2619

2268

client["last_checker_status"]))

2620

2269

client["enabled"] = False

2621

2270

else:

2624

2273

+ client["timeout"])

2625

2274

logger.debug("Last checker succeeded,"

2626

2275

" keeping {0} enabled"

2627

.format(client_name))

2276

.format(client["name"]))

2628

2277

try:

2629

2278

client["secret"] = (

2630

2279

pgp.decrypt(client["encrypted_secret"],

2636

2285

.format(client_name))

2637

2286

client["secret"] = (

2638

2287

client_settings[client_name]["secret"])

2288

2639

2289

2640

2290

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

2641

2291

for client_name in (set(old_client_settings)

2644

2294

for client_name in (set(client_settings)

2645

2295

- set(old_client_settings)):

2646

2296

clients_data[client_name] = client_settings[client_name]

2647

2648

# Create all client objects

2297

2298

# Create clients all clients

2649

2299

for client_name, client in clients_data.iteritems():

2650

2300

tcp_server.clients[client_name] = client_class(

2651

name = client_name, settings = client,

2652

server_settings = server_settings)

2301

name = client_name, settings = client)

2653

2302

2654

2303

if not tcp_server.clients:

2655

2304

logger.warning("No clients defined")

2656

2657

if not foreground:

2658

if pidfile is not None:

2659

try:

2660

with pidfile:

2661

pid = os.getpid()

2662

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

2663

except IOError:

2664

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

2665

pidfilename, pid)

2666

del pidfile

2305

2306

if not debug:

2307

try:

2308

with pidfile:

2309

pid = os.getpid()

2310

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

2311

del pidfile

2312

except IOError:

2313

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

2314

pidfilename, pid)

2315

except NameError:

2316

# "pidfile" was never created

2317

pass

2667

2318

del pidfilename

2319

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

2668

2320

2669

2321

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

2670

2322

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

2671

2323

2672

2324

if use_dbus:

2673

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

2674

"se.bsnet.fukt.Mandos"})

2675

class MandosDBusService(DBusObjectWithProperties):

2325

class MandosDBusService(dbus.service.Object):

2676

2326

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

2677

2327

def __init__(self):

2678

2328

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

2679

2329

_interface = "se.recompile.Mandos"

2680

2330

2681

@dbus_interface_annotations(_interface)

2682

def _foo(self):

2683

return { "org.freedesktop.DBus.Property"

2684

".EmitsChangedSignal":

2685

"false"}

2686

2687

2331

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

2688

2332

def ClientAdded(self, objpath):

2689

2333

"D-Bus signal"

2731

2375

2732

2376

del _interface

2733

2377

2734

mandos_dbus_service = MandosDBusService()

2378

class MandosDBusServiceTransitional(MandosDBusService):

2379

__metaclass__ = AlternateDBusNamesMetaclass

2380

mandos_dbus_service = MandosDBusServiceTransitional()

2735

2381

2736

2382

def cleanup():

2737

2383

"Cleanup function; run on exit"

2738

2384

service.cleanup()

2739

2385

2740

2386

multiprocessing.active_children()

2741

wnull.close()

2742

2387

if not (tcp_server.clients or client_settings):

2743

2388

return

2744

2389

2756

2401

# A list of attributes that can not be pickled

2757

2402

# + secret.

2758

2403

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

2759

"checker", "server_settings"))

2404

"checker"))

2760

2405

for name, typ in (inspect.getmembers

2761

2406

(dbus.service.Object)):

2762

2407

exclude.add(name)

2771

2416

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

2772

2417

2773

2418

try:

2774

with (tempfile.NamedTemporaryFile

2775

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

2776

dir=os.path.dirname(stored_state_path),

2777

delete=False)) as stored_state:

2419

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

2420

prefix="clients-",

2421

dir=os.path.dirname

2422

(stored_state_path))

2423

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

2778

2424

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

2779

tempname=stored_state.name

2780

2425

os.rename(tempname, stored_state_path)

2781

2426

except (IOError, OSError) as e:

2427

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

2428

.format(e))

2782

2429

if not debug:

2783

2430

try:

2784

2431

os.remove(tempname)

2785

2432

except NameError:

2786

2433

pass

2787

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

2788

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

2789

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

2790

else:

2791

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

2792

exc_info=e)

2434

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

2435

errno.EEXIST)):

2793

2436

raise e

2794

2437

2795

2438

# Delete all clients, and settings from config

2823

2466

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

2824

2467

if use_ipv6:

2825

2468

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

2826

" flowinfo %d, scope_id %d",

2827

*tcp_server.socket.getsockname())

2469

" flowinfo %d, scope_id %d"

2470

% tcp_server.socket.getsockname())

2828

2471

else: # IPv4

2829

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

2830

*tcp_server.socket.getsockname())

2472

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

2473

% tcp_server.socket.getsockname())

2831

2474

2832

2475

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

2833

2476

2836

2479

try:

2837

2480

service.activate()

2838

2481

except dbus.exceptions.DBusException as error:

2839

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

2482

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

2840

2483

cleanup()

2841

2484

sys.exit(1)

2842

2485

# End of Avahi example code

2849

2492

logger.debug("Starting main loop")

2850

2493

main_loop.run()

2851

2494

except AvahiError as error:

2852

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

2495

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

2853

2496

cleanup()

2854

2497

sys.exit(1)

2855

2498

except KeyboardInterrupt: