/mandos/trunk : revision 544

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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 = "1.6.0"

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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class PGPEngine(object):

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

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet',

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'--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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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()

581

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

600

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

587

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

605

if not quiet:

606

self.send_changedstate()

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592

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

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return False

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613

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def init_checker(self):

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599

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

615

600

# and every interval from then on.

616

if self.checker_initiator_tag is not None:

617

gobject.source_remove(self.checker_initiator_tag)

618

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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604

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

622

if self.disable_initiator_tag is not None:

623

gobject.source_remove(self.disable_initiator_tag)

624

605

self.disable_initiator_tag = (gobject.timeout_add

625

606

(self.timeout_milliseconds(),

626

607

self.disable))

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626

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

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627

vars(self))

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628

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def checked_ok(self):

649

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

650

self.last_checked_ok = datetime.datetime.utcnow()

651

self.last_checker_status = 0

652

self.bump_timeout()

653

654

def bump_timeout(self, timeout=None):

655

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

629

def checked_ok(self, timeout=None):

630

"""Bump up the timeout for this client.

631

632

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

633

alive and well.

634

"""

656

635

if timeout is None:

657

636

timeout = self.timeout

637

self.last_checked_ok = datetime.datetime.utcnow()

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638

if self.disable_initiator_tag is not None:

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639

gobject.source_remove(self.disable_initiator_tag)

660

self.disable_initiator_tag = None

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640

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

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641

self.disable_initiator_tag = (gobject.timeout_add

663

642

(timedelta_to_milliseconds

673

652

If a checker already exists, leave it running and do

674

653

nothing."""

675

654

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

676

# 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

679

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

655

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

656

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

657

# client would inevitably timeout, since no checker would get

658

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

680

659

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

681

660

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

682

661

# should be.

696

675

self.current_checker_command)

697

676

# Start a new checker if needed

698

677

if self.checker is None:

699

# 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

678

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

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

710

697

self.current_checker_command = command

711

698

try:

712

699

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

715

702

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

716

703

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

717

704

# 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

705

self.checker = subprocess.Popen(command,

727

706

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:

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

713

# watch was added. Check for this.

741

714

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)

742

718

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)

719

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

720

error)

752

721

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

753

722

return True

754

723

761

730

return

762

731

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

763

732

try:

764

self.checker.terminate()

733

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

765

734

#time.sleep(0.5)

766

735

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

767

# self.checker.kill()

736

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

768

737

except OSError as error:

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738

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

770

739

raise

787

756

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

788

757

if byte_arrays and signature != "ay":

789

758

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

790

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

759

" signature %r" % signature)

791

760

def decorator(func):

792

761

func._dbus_is_property = True

793

762

func._dbus_interface = dbus_interface

801

770

return decorator

802

771

803

772

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

773

class DBusPropertyException(dbus.exceptions.DBusException):

842

774

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

843

775

"""

866

798

"""

867

799

868

800

@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)

801

def _is_dbus_property(obj):

802

return getattr(obj, "_dbus_is_property", False)

877

803

878

def _get_all_dbus_things(self, thing):

804

def _get_all_dbus_properties(self):

879

805

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

880

806

"""

881

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

882

name),

883

athing.__get__(self))

807

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

884

808

for cls in self.__class__.__mro__

885

for name, athing in

886

inspect.getmembers(cls,

887

self._is_dbus_thing(thing)))

809

for name, prop in

810

inspect.getmembers(cls, self._is_dbus_property))

888

811

889

812

def _get_dbus_property(self, interface_name, property_name):

890

813

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

892

815

"""

893

816

for cls in self.__class__.__mro__:

894

817

for name, value in (inspect.getmembers

895

(cls,

896

self._is_dbus_thing("property"))):

818

(cls, self._is_dbus_property)):

897

819

if (value._dbus_name == property_name

898

820

and value._dbus_interface == interface_name):

899

821

return value.__get__(self)

928

850

# signatures other than "ay".

929

851

if prop._dbus_signature != "ay":

930

852

raise ValueError

931

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

932

for byte in value))

853

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

854

for byte in value))

933

855

prop(value)

934

856

935

857

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

941

863

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

942

864

"""

943

865

properties = {}

944

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

866

for name, prop in self._get_all_dbus_properties():

945

867

if (interface_name

946

868

and interface_name != prop._dbus_interface):

947

869

# Interface non-empty but did not match

962

884

path_keyword='object_path',

963

885

connection_keyword='connection')

964

886

def Introspect(self, object_path, connection):

965

"""Overloading of standard D-Bus method.

966

967

Inserts property tags and interface annotation tags.

887

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

968

888

"""

969

889

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

970

890

connection)

977

897

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

978

898

return e

979

899

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

980

# Add property tags

981

900

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

982

901

for name, prop

983

in self._get_all_dbus_things("property")

902

in self._get_all_dbus_properties()

984

903

if prop._dbus_interface

985

904

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

986

905

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

906

# Add the names to the return values for the

1019

907

# "org.freedesktop.DBus.Properties" methods

1020

908

if (if_tag.getAttribute("name")

1035

923

except (AttributeError, xml.dom.DOMException,

1036

924

xml.parsers.expat.ExpatError) as error:

1037

925

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

1038

exc_info=error)

926

error)

1039

927

return xmlstring

1040

928

1041

929

1042

def datetime_to_dbus(dt, variant_level=0):

930

def datetime_to_dbus (dt, variant_level=0):

1043

931

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

1044

932

if dt is None:

1045

933

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

1047

935

variant_level=variant_level)

1048

936

1049

937

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).

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.

1072

942

"""

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):

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):

1080

950

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

1081

951

# with the wrong interface name

1082

952

if (not hasattr(attribute, "_dbus_interface")

1083

953

or not attribute._dbus_interface

1084

.startswith(orig_interface_name)):

954

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

1085

955

continue

1086

956

# Create an alternate D-Bus interface name based on

1087

957

# the current name

1088

958

alt_interface = (attribute._dbus_interface

1089

.replace(orig_interface_name,

1090

alt_interface_name))

1091

interface_names.add(alt_interface)

959

.replace("se.recompile.Mandos",

960

"se.bsnet.fukt.Mandos"))

1092

961

# Is this a D-Bus signal?

1093

962

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

1094

# Extract the original non-method undecorated

1095

# function by black magic

963

# Extract the original non-method function by

964

# black magic

1096

965

nonmethod_func = (dict(

1097

966

zip(attribute.func_code.co_freevars,

1098

967

attribute.__closure__))["func"]

1109

978

nonmethod_func.func_name,

1110

979

nonmethod_func.func_defaults,

1111

980

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

981

# 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

982

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

983

# signals gets sent when the function is called

1122

984

def fixscope(func1, func2):

1123

985

"""This function is a scope container to pass

1124

986

func1 and func2 to the "call_both" function

1131

993

return call_both

1132

994

# Create the "call_both" function and add it to

1133

995

# the class

1134

attr[attrname] = fixscope(attribute, new_function)

996

attr[attrname] = fixscope(attribute,

997

new_function)

1135

998

# Is this a D-Bus method?

1136

999

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

1137

1000

# Create a new, but exactly alike, function

1148

1011

attribute.func_name,

1149

1012

attribute.func_defaults,

1150

1013

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

1014

# Is this a D-Bus property?

1158

1015

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

1159

1016

# Create a new, but exactly alike, function

1173

1030

attribute.func_name,

1174

1031

attribute.func_defaults,

1175

1032

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"})

1033

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

1034

1035

1221

1036

class ClientDBus(Client, DBusObjectWithProperties):

1222

1037

"""A Client class using D-Bus

1223

1038

1234

1049

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

1235

1050

self.bus = bus

1236

1051

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

1052

self._approvals_pending = 0

1053

1054

self._approvals_pending = 0

1237

1055

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

1238

1056

# the D-Bus

1239

1057

client_object_name = unicode(self.name).translate(

1243

1061

("/clients/" + client_object_name))

1244

1062

DBusObjectWithProperties.__init__(self, self.bus,

1245

1063

self.dbus_object_path)

1246

1064

1247

1065

def notifychangeproperty(transform_func,

1248

1066

dbus_name, type_func=lambda x: x,

1249

1067

variant_level=1):

1272

1090

1273

1091

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

1274

1092

1093

1275

1094

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1276

1095

approvals_pending = notifychangeproperty(dbus.Boolean,

1277

1096

"ApprovalPending",

1284

1103

checker is not None)

1285

1104

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1286

1105

"LastCheckedOK")

1287

last_checker_status = notifychangeproperty(dbus.Int16,

1288

"LastCheckerStatus")

1289

1106

last_approval_request = notifychangeproperty(

1290

1107

datetime_to_dbus, "LastApprovalRequest")

1291

1108

approved_by_default = notifychangeproperty(dbus.Boolean,

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

1416

1227

"D-Bus signal"

1417

1228

return self.need_approval()

1418

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

1419

1238

## Methods

1420

1239

1421

1240

# Approve - method

1531

1350

return

1532

1351

return datetime_to_dbus(self.last_checked_ok)

1533

1352

1534

# LastCheckerStatus - property

1535

@dbus_service_property(_interface, signature="n",

1536

access="read")

1537

def LastCheckerStatus_dbus_property(self):

1538

return dbus.Int16(self.last_checker_status)

1539

1540

1353

# Expires - property

1541

1354

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

1542

1355

def Expires_dbus_property(self):

1553

1366

def Timeout_dbus_property(self, value=None):

1554

1367

if value is None: # get

1555

1368

return dbus.UInt64(self.timeout_milliseconds())

1556

old_timeout = self.timeout

1557

1369

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

1558

# Reschedule disabling

1370

# Reschedule timeout

1559

1371

if self.enabled:

1560

1372

now = datetime.datetime.utcnow()

1561

self.expires += self.timeout - old_timeout

1562

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:

1563

1376

# The timeout has passed

1564

1377

self.disable()

1565

1378

else:

1379

self.expires = (now +

1380

datetime.timedelta(milliseconds =

1381

time_to_die))

1566

1382

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

1567

1383

is None):

1568

1384

return

1569

1385

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))

1386

self.disable_initiator_tag = (gobject.timeout_add

1387

(time_to_die,

1388

self.disable))

1574

1389

1575

1390

# ExtendedTimeout - property

1576

1391

@dbus_service_property(_interface, signature="t",

1655

1470

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

1656

1471

1657

1472

1473

class ClientDBusTransitional(ClientDBus):

1474

__metaclass__ = AlternateDBusNamesMetaclass

1475

1476

1658

1477

class ClientHandler(socketserver.BaseRequestHandler, object):

1659

1478

"""A class to handle client connections.

1660

1479

1728

1547

except KeyError:

1729

1548

return

1730

1549

1550

if self.server.use_dbus:

1551

# Emit D-Bus signal

1552

client.NewRequest(str(self.client_address))

1553

1731

1554

if client.approval_delay:

1732

1555

delay = client.approval_delay

1733

1556

client.approvals_pending += 1

1764

1587

#wait until timeout or approved

1765

1588

time = datetime.datetime.now()

1766

1589

client.changedstate.acquire()

1767

client.changedstate.wait(

1768

float(timedelta_to_milliseconds(delay)

1769

/ 1000))

1590

(client.changedstate.wait

1591

(float(client.timedelta_to_milliseconds(delay)

1592

/ 1000)))

1770

1593

client.changedstate.release()

1771

1594

time2 = datetime.datetime.now()

1772

1595

if (time2 - time) >= delay:

1788

1611

try:

1789

1612

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

1790

1613

except gnutls.errors.GNUTLSError as error:

1791

logger.warning("gnutls send failed",

1792

exc_info=error)

1614

logger.warning("gnutls send failed")

1793

1615

return

1794

1616

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

1795

1617

sent, len(client.secret)

1798

1620

1799

1621

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

1800

1622

# bump the timeout using extended_timeout

1801

client.bump_timeout(client.extended_timeout)

1623

client.checked_ok(client.extended_timeout)

1802

1624

if self.server.use_dbus:

1803

1625

# Emit D-Bus signal

1804

1626

client.GotSecret()

1809

1631

try:

1810

1632

session.bye()

1811

1633

except gnutls.errors.GNUTLSError as error:

1812

logger.warning("GnuTLS bye failed",

1813

exc_info=error)

1634

logger.warning("GnuTLS bye failed")

1814

1635

1815

1636

@staticmethod

1816

1637

def peer_certificate(session):

1888

1709

def process_request(self, request, address):

1889

1710

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

1890

1711

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

1891

args = (request, address))

1712

args = (request,

1713

address))

1892

1714

proc.start()

1893

1715

return proc

1894

1716

1922

1744

use_ipv6: Boolean; to use IPv6 or not

1923

1745

"""

1924

1746

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

"""

1747

interface=None, use_ipv6=True):

1929

1748

self.interface = interface

1930

1749

if use_ipv6:

1931

1750

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

1751

socketserver.TCPServer.__init__(self, server_address,

1959

1752

RequestHandlerClass)

1960

1961

1753

def server_bind(self):

1962

1754

"""This overrides the normal server_bind() function

1963

1755

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

1971

1763

try:

1972

1764

self.socket.setsockopt(socket.SOL_SOCKET,

1973

1765

SO_BINDTODEVICE,

1974

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

1766

str(self.interface

1767

+ '\0'))

1975

1768

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:

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:

1980

1774

logger.error("SO_BINDTODEVICE not available;"

1981

1775

" cannot bind to interface %s",

1982

1776

self.interface)

1983

elif error.errno == errno.ENODEV:

1984

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

1985

" cannot bind", self.interface)

1986

1777

else:

1987

1778

raise

1988

1779

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

1991

1782

if self.address_family == socket.AF_INET6:

1992

1783

any_address = "::" # in6addr_any

1993

1784

else:

1994

any_address = "0.0.0.0" # INADDR_ANY

1785

any_address = socket.INADDR_ANY

1995

1786

self.server_address = (any_address,

1996

1787

self.server_address[1])

1997

1788

elif not self.server_address[1]:

2018

1809

"""

2019

1810

def __init__(self, server_address, RequestHandlerClass,

2020

1811

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

2021

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

1812

gnutls_priority=None, use_dbus=True):

2022

1813

self.enabled = False

2023

1814

self.clients = clients

2024

1815

if self.clients is None:

2028

1819

IPv6_TCPServer.__init__(self, server_address,

2029

1820

RequestHandlerClass,

2030

1821

interface = interface,

2031

use_ipv6 = use_ipv6,

2032

socketfd = socketfd)

1822

use_ipv6 = use_ipv6)

2033

1823

def server_activate(self):

2034

1824

if self.enabled:

2035

1825

return socketserver.TCPServer.server_activate(self)

2048

1838

2049

1839

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

2050

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)

2051

1855

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

2052

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

1856

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

2053

1857

# Wait for other process to exit

2054

1858

proc.join()

2055

1859

return False

2113

1917

return True

2114

1918

2115

1919

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

1920

def string_to_delta(interval):

2216

1921

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

2217

1922

2228

1933

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

2229

1934

datetime.timedelta(0, 330)

2230

1935

"""

2231

2232

try:

2233

return rfc3339_duration_to_delta(interval)

2234

except ValueError:

2235

pass

2236

2237

1936

timevalue = datetime.timedelta(0)

2238

1937

for s in interval.split():

2239

1938

try:

2250

1949

elif suffix == "w":

2251

1950

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

2252

1951

else:

2253

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

2254

.format(suffix))

1952

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

2255

1953

except (ValueError, IndexError) as e:

2256

1954

raise ValueError(*(e.args))

2257

1955

timevalue += delta

2271

1969

sys.exit()

2272

1970

if not noclose:

2273

1971

# Close all standard open file descriptors

2274

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

1972

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

2275

1973

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

2276

1974

raise OSError(errno.ENODEV,

2277

"{0} not a character device"

2278

.format(os.devnull))

1975

"%s not a character device"

1976

% os.path.devnull)

2279

1977

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

2280

1978

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

2281

1979

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

2290

1988

2291

1989

parser = argparse.ArgumentParser()

2292

1990

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

2293

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

1991

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

2294

1992

help="show version number and exit")

2295

1993

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

2296

1994

help="Bind to interface IF")

2302

2000

help="Run self-test")

2303

2001

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

2304

2002

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

2305

" to terminal", default=None)

2003

" to terminal")

2306

2004

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

2307

2005

help="Debug level for stdout output")

2308

2006

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

2315

2013

" files")

2316

2014

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

2317

2015

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

2318

" system bus interface", default=None)

2016

" system bus interface")

2319

2017

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

2320

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

2321

default=None)

2018

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

2322

2019

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

2323

2020

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")

2021

" state")

2328

2022

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

2329

2023

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

2330

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

2331

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

2332

2024

2333

2025

options = parser.parse_args()

2334

2026

2343

2035

"port": "",

2344

2036

"debug": "False",

2345

2037

"priority":

2346

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

2038

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

2347

2039

"servicename": "Mandos",

2348

2040

"use_dbus": "True",

2349

2041

"use_ipv6": "True",

2350

2042

"debuglevel": "",

2351

2043

"restore": "True",

2352

"socket": "",

2353

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

2354

"foreground": "False",

2044

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

2355

2045

}

2356

2046

2357

2047

# Parse config file for server-global settings

2362

2052

# Convert the SafeConfigParser object to a dict

2363

2053

server_settings = server_config.defaults()

2364

2054

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

2365

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

2055

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

2366

2056

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

2367

2057

option)

2368

2058

if server_settings["port"]:

2369

2059

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

2370

2060

"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

2061

del server_config

2381

2062

2382

2063

# Override the settings from the config file with command line

2384

2065

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

2385

2066

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

2386

2067

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

2387

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

2068

"statedir"):

2388

2069

value = getattr(options, option)

2389

2070

if value is not None:

2390

2071

server_settings[option] = value

2393

2074

for option in server_settings.keys():

2394

2075

if type(server_settings[option]) is str:

2395

2076

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

2077

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

2404

2078

2405

2079

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

2411

2085

use_ipv6 = server_settings["use_ipv6"]

2412

2086

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

2413

2087

stored_state_file)

2414

foreground = server_settings["foreground"]

2415

2088

2416

2089

if debug:

2417

2090

initlogger(debug, logging.DEBUG)

2424

2097

2425

2098

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

2426

2099

syslogger.setFormatter(logging.Formatter

2427

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

2428

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

2429

.format(server_settings

2430

["servicename"])))

2100

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

2101

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

2102

% server_settings["servicename"]))

2431

2103

2432

2104

# Parse config file with clients

2433

2105

client_config = configparser.SafeConfigParser(Client

2446

2118

use_ipv6=use_ipv6,

2447

2119

gnutls_priority=

2448

2120

server_settings["priority"],

2449

use_dbus=use_dbus,

2450

socketfd=(server_settings["socket"]

2451

or None))

2452

if not foreground:

2121

use_dbus=use_dbus)

2122

if not debug:

2453

2123

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

2454

pidfile = None

2455

2124

try:

2456

2125

pidfile = open(pidfilename, "w")

2457

except IOError as e:

2458

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

2459

exc_info=e)

2126

except IOError:

2127

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

2460

2128

2461

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:

2462

2133

try:

2463

uid = pwd.getpwnam(name).pw_uid

2464

gid = pwd.getpwnam(name).pw_gid

2465

break

2134

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

2135

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

2466

2136

except KeyError:

2467

continue

2468

else:

2469

uid = 65534

2470

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

2471

2143

try:

2472

2144

os.setgid(gid)

2473

2145

os.setuid(uid)

2474

2146

except OSError as error:

2475

if error.errno != errno.EPERM:

2147

if error[0] != errno.EPERM:

2476

2148

raise error

2477

2149

2478

2150

if debug:

2490

2162

.gnutls_global_set_log_function(debug_gnutls))

2491

2163

2492

2164

# Redirect stdin so all checkers get /dev/null

2493

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

2165

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

2494

2166

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

2495

2167

if null > 2:

2496

2168

os.close(null)

2497

2169

2498

2170

# Need to fork before connecting to D-Bus

2499

if not foreground:

2171

if not debug:

2500

2172

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

2501

2173

daemon()

2502

2174

2503

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

2504

# need to inform gobject that threads will be used.

2505

2175

gobject.threads_init()

2506

2176

2507

2177

global main_loop

2508

2178

# From the Avahi example code

2509

DBusGMainLoop(set_as_default=True)

2179

DBusGMainLoop(set_as_default=True )

2510

2180

main_loop = gobject.MainLoop()

2511

2181

bus = dbus.SystemBus()

2512

2182

# End of Avahi example code

2518

2188

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

2519

2189

do_not_queue=True))

2520

2190

except dbus.exceptions.NameExistsException as e:

2521

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

2191

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

2522

2192

use_dbus = False

2523

2193

server_settings["use_dbus"] = False

2524

2194

tcp_server.use_dbus = False

2536

2206

2537

2207

client_class = Client

2538

2208

if use_dbus:

2539

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

2209

client_class = functools.partial(ClientDBusTransitional,

2210

bus = bus)

2540

2211

2541

2212

client_settings = Client.config_parser(client_config)

2542

2213

old_client_settings = {}

2543

2214

clients_data = {}

2544

2215

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

2216

# Get client data and settings from last running state.

2554

2217

if server_settings["restore"]:

2555

2218

try:

2558

2221

(stored_state))

2559

2222

os.remove(stored_state_path)

2560

2223

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)

2224

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

2225

.format(e))

2226

if e.errno != errno.ENOENT:

2567

2227

raise

2568

2228

except EOFError as e:

2569

2229

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

2570

"EOFError:", exc_info=e)

2230

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

2571

2231

2572

2232

with PGPEngine() as pgp:

2573

2233

for client_name, client in clients_data.iteritems():

2574

# Skip removed clients

2575

if client_name not in client_settings:

2576

continue

2577

2578

2234

# Decide which value to use after restoring saved state.

2579

2235

# We have three different values: Old config file,

2580

2236

# new config file, and saved state.

2594

2250

2595

2251

# Clients who has passed its expire date can still be

2596

2252

# enabled if its last checker was successful. Clients

2597

# whose checker succeeded before we stored its state is

2598

# assumed to have successfully run all checkers during

2599

# downtime.

2253

# whose checker failed before we stored its state is

2254

# assumed to have failed all checkers during downtime.

2600

2255

if client["enabled"]:

2601

2256

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

2602

2257

if not client["last_checked_ok"]:

2603

2258

logger.warning(

2604

2259

"disabling client {0} - Client never "

2605

"performed a successful checker"

2606

.format(client_name))

2260

"performed a successfull checker"

2261

.format(client["name"]))

2607

2262

client["enabled"] = False

2608

2263

elif client["last_checker_status"] != 0:

2609

2264

logger.warning(

2610

2265

"disabling client {0} - Client "

2611

2266

"last checker failed with error code {1}"

2612

.format(client_name,

2267

.format(client["name"],

2613

2268

client["last_checker_status"]))

2614

2269

client["enabled"] = False

2615

2270

else:

2618

2273

+ client["timeout"])

2619

2274

logger.debug("Last checker succeeded,"

2620

2275

" keeping {0} enabled"

2621

.format(client_name))

2276

.format(client["name"]))

2622

2277

try:

2623

2278

client["secret"] = (

2624

2279

pgp.decrypt(client["encrypted_secret"],

2630

2285

.format(client_name))

2631

2286

client["secret"] = (

2632

2287

client_settings[client_name]["secret"])

2288

2633

2289

2634

2290

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

2635

2291

for client_name in (set(old_client_settings)

2638

2294

for client_name in (set(client_settings)

2639

2295

- set(old_client_settings)):

2640

2296

clients_data[client_name] = client_settings[client_name]

2641

2642

# Create all client objects

2297

2298

# Create clients all clients

2643

2299

for client_name, client in clients_data.iteritems():

2644

2300

tcp_server.clients[client_name] = client_class(

2645

name = client_name, settings = client,

2646

server_settings = server_settings)

2301

name = client_name, settings = client)

2647

2302

2648

2303

if not tcp_server.clients:

2649

2304

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

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

2661

2318

del pidfilename

2319

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

2662

2320

2663

2321

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

2664

2322

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

2665

2323

2666

2324

if use_dbus:

2667

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

2668

"se.bsnet.fukt.Mandos"})

2669

class MandosDBusService(DBusObjectWithProperties):

2325

class MandosDBusService(dbus.service.Object):

2670

2326

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

2671

2327

def __init__(self):

2672

2328

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

2673

2329

_interface = "se.recompile.Mandos"

2674

2330

2675

@dbus_interface_annotations(_interface)

2676

def _foo(self):

2677

return { "org.freedesktop.DBus.Property"

2678

".EmitsChangedSignal":

2679

"false"}

2680

2681

2331

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

2682

2332

def ClientAdded(self, objpath):

2683

2333

"D-Bus signal"

2725

2375

2726

2376

del _interface

2727

2377

2728

mandos_dbus_service = MandosDBusService()

2378

class MandosDBusServiceTransitional(MandosDBusService):

2379

__metaclass__ = AlternateDBusNamesMetaclass

2380

mandos_dbus_service = MandosDBusServiceTransitional()

2729

2381

2730

2382

def cleanup():

2731

2383

"Cleanup function; run on exit"

2732

2384

service.cleanup()

2733

2385

2734

2386

multiprocessing.active_children()

2735

wnull.close()

2736

2387

if not (tcp_server.clients or client_settings):

2737

2388

return

2738

2389

2750

2401

# A list of attributes that can not be pickled

2751

2402

# + secret.

2752

2403

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

2753

"checker", "server_settings"))

2404

"checker"))

2754

2405

for name, typ in (inspect.getmembers

2755

2406

(dbus.service.Object)):

2756

2407

exclude.add(name)

2765

2416

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

2766

2417

2767

2418

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:

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:

2772

2424

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

2773

tempname=stored_state.name

2774

2425

os.rename(tempname, stored_state_path)

2775

2426

except (IOError, OSError) as e:

2427

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

2428

.format(e))

2776

2429

if not debug:

2777

2430

try:

2778

2431

os.remove(tempname)

2779

2432

except NameError:

2780

2433

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)

2434

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

2435

errno.EEXIST)):

2787

2436

raise e

2788

2437

2789

2438

# Delete all clients, and settings from config

2817

2466

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

2818

2467

if use_ipv6:

2819

2468

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

2820

" flowinfo %d, scope_id %d",

2821

*tcp_server.socket.getsockname())

2469

" flowinfo %d, scope_id %d"

2470

% tcp_server.socket.getsockname())

2822

2471

else: # IPv4

2823

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

2824

*tcp_server.socket.getsockname())

2472

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

2473

% tcp_server.socket.getsockname())

2825

2474

2826

2475

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

2827

2476

2830

2479

try:

2831

2480

service.activate()

2832

2481

except dbus.exceptions.DBusException as error:

2833

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

2482

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

2834

2483

cleanup()

2835

2484

sys.exit(1)

2836

2485

# End of Avahi example code

2843

2492

logger.debug("Starting main loop")

2844

2493

main_loop.run()

2845

2494

except AvahiError as error:

2846

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

2495

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

2847

2496

cleanup()

2848

2497

sys.exit(1)

2849

2498

except KeyboardInterrupt: