/mandos/release : revision 237.7.335

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#!/usr/bin/python

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#!/usr/bin/python2.7

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# -*- mode: python; coding: utf-8 -*-

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#

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#

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# Mandos server - give out binary blobs to connecting clients.

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#

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#

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# This program is partly derived from an example program for an Avahi

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# service publisher, downloaded from

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# <http://avahi.org/wiki/PythonPublishExample>. This includes the

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# methods "add", "remove", "server_state_changed",

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# "entry_group_state_changed", "cleanup", and "activate" in the

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

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#

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#

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# Everything else is

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#

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# This file is part of Mandos.

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#

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

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

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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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# the Free Software Foundation, either version 3 of the License, or

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# (at your option) any later version.

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#

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# Mandos is distributed in the hope that it will be useful, but

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# WITHOUT ANY WARRANTY; without even the implied warranty of

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# This program is distributed in the hope that it will be useful,

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# but WITHOUT ANY WARRANTY; without even the implied warranty of

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

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# GNU General Public License for more details.

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#

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#

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# You should have received a copy of the GNU General Public License

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# along with Mandos. If not, see <http://www.gnu.org/licenses/>.

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#

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# along with this program. If not, see

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# <http://www.gnu.org/licenses/>.

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#

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# Contact the authors at <mandos@recompile.se>.

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#

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#

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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try:

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from future_builtins import *

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except ImportError:

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pass

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from future_builtins import *

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try:

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import SocketServer as socketserver

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import argparse

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import datetime

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import errno

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import gnutls.crypto

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import gnutls.connection

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import gnutls.errors

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import gnutls.library.functions

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import gnutls.library.constants

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import gnutls.library.types

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try:

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import ConfigParser as configparser

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except ImportError:

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import dbus

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import dbus.service

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from gi.repository import GLib

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try:

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import gobject

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except ImportError:

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from gi.repository import GObject as gobject

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import avahi

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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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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# Try to find the value of SO_BINDTODEVICE:

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try:

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# This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and

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# newer, and it is also the most natural place for it:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except AttributeError:

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try:

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# This is where SO_BINDTODEVICE was up to and including Python

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# 2.6, and also 3.2:

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from IN import SO_BINDTODEVICE

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except ImportError:

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# In Python 2.7 it seems to have been removed entirely.

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# Try running the C preprocessor:

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try:

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cc = subprocess.Popen(["cc", "--language=c", "-E",

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"/dev/stdin"],

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stdin=subprocess.PIPE,

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stdout=subprocess.PIPE)

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stdout = cc.communicate(

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"#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]

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SO_BINDTODEVICE = int(stdout.splitlines()[-1])

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except (OSError, ValueError, IndexError):

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# No value found

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SO_BINDTODEVICE = None

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.8.1"

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version = "1.6.9"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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if_nametoindex = ctypes.cdll.LoadLibrary(

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ctypes.util.find_library("c")).if_nametoindex

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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"Get an interface index the hard way, i.e. using fcntl()"

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SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

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return interface_index

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def copy_function(func):

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"""Make a copy of a function"""

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if sys.version_info.major == 2:

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return types.FunctionType(func.func_code,

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func.func_globals,

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func.func_name,

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func.func_defaults,

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func.func_closure)

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else:

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return types.FunctionType(func.__code__,

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func.__globals__,

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func.__name__,

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func.__defaults__,

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func.__closure__)

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def initlogger(debug, level=logging.WARNING):

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler(

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facility=logging.handlers.SysLogHandler.LOG_DAEMON,

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address="/dev/log"))

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facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(asctime)s %(name)s'

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

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self.gpg = "gpg"

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try:

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output = subprocess.check_output(["gpgconf"])

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for line in output.splitlines():

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name, text, path = line.split(b":")

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if name == "gpg":

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self.gpg = path

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break

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except OSError as e:

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if e.errno != errno.ENOENT:

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raise

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self.gnupgargs = ['--batch',

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'--homedir', self.tempdir,

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet']

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# Only GPG version 1 has the --no-use-agent option.

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if self.gpg == "gpg" or self.gpg.endswith("/gpg"):

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self.gnupgargs.append("--no-use-agent")

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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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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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for root, dirs, files in os.walk(self.tempdir,

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topdown=False):

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topdown = False):

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for filename in files:

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os.remove(os.path.join(root, filename))

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for dirname in dirs:

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir=self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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

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'--passphrase-file',

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passfile.name]

249

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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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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

213

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

254

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

257

217

258

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def decrypt(self, data, password):

259

219

passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir=self.tempdir) as passfile:

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dir = self.tempdir) as passfile:

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passfile.write(passphrase)

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223

passfile.flush()

264

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

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

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'--passphrase-file',

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passfile.name]

267

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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=data)

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

231

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

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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# Pretend that we have an Avahi module

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class Avahi(object):

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"""This isn't so much a class as it is a module-like namespace.

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It is instantiated once, and simulates having an Avahi module."""

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IF_UNSPEC = -1 # avahi-common/address.h

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PROTO_UNSPEC = -1 # avahi-common/address.h

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PROTO_INET = 0 # avahi-common/address.h

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PROTO_INET6 = 1 # avahi-common/address.h

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DBUS_NAME = "org.freedesktop.Avahi"

286

DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

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DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

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DBUS_PATH_SERVER = "/"

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def string_array_to_txt_array(self, t):

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return dbus.Array((dbus.ByteArray(s.encode("utf-8"))

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for s in t), signature="ay")

293

ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

294

ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

295

ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

296

SERVER_INVALID = 0 # avahi-common/defs.h

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SERVER_REGISTERING = 1 # avahi-common/defs.h

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SERVER_RUNNING = 2 # avahi-common/defs.h

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SERVER_COLLISION = 3 # avahi-common/defs.h

300

SERVER_FAILURE = 4 # avahi-common/defs.h

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avahi = Avahi()

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303

304

237

class AvahiError(Exception):

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238

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

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self.value = value

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251

319

252

class AvahiService(object):

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"""An Avahi (Zeroconf) service.

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254

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Attributes:

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interface: integer; avahi.IF_UNSPEC or an interface index.

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Used to optionally bind to the specified interface.

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server: D-Bus Server

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bus: dbus.SystemBus()

338

271

"""

339

272

340

273

def __init__(self,

341

interface=avahi.IF_UNSPEC,

342

name=None,

343

servicetype=None,

344

port=None,

345

TXT=None,

346

domain="",

347

host="",

348

max_renames=32768,

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protocol=avahi.PROTO_UNSPEC,

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bus=None):

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

278

TXT = None,

279

domain = "",

280

host = "",

281

max_renames = 32768,

282

protocol = avahi.PROTO_UNSPEC,

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bus = None):

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self.interface = interface

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285

self.name = name

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self.type = servicetype

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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, remove=True):

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

368

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if self.rename_count >= self.max_renames:

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

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self.cleanup()

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os._exit(1)

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324

392

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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

397

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if self.group is not None:

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self.group.Reset()

399

332

400

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def add(self):

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

402

335

self.remove()

419

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dbus.UInt16(self.port),

420

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

422

355

423

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def entry_group_state_changed(self, state, error):

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357

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

425

358

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

426

359

427

360

if state == avahi.ENTRY_GROUP_ESTABLISHED:

428

361

logger.debug("Zeroconf service established.")

429

362

elif state == avahi.ENTRY_GROUP_COLLISION:

433

366

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

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367

str(error))

435

368

raise AvahiGroupError("State changed: {!s}".format(error))

436

369

437

370

def cleanup(self):

438

371

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

439

372

if self.group is not None:

444

377

pass

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378

self.group = None

446

379

self.remove()

447

380

448

381

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

449

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

450

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

479

412

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

480

413

else:

481

414

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

482

415

483

416

def activate(self):

484

417

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

485

418

if self.server is None:

496

429

class AvahiServiceToSyslog(AvahiService):

497

430

def rename(self, *args, **kwargs):

498

431

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

499

ret = super(AvahiServiceToSyslog, self).rename(*args, **kwargs)

432

ret = AvahiService.rename(self, *args, **kwargs)

500

433

syslogger.setFormatter(logging.Formatter(

501

434

'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'

502

435

.format(self.name)))

503

436

return ret

504

437

505

506

# Pretend that we have a GnuTLS module

507

class GnuTLS(object):

508

"""This isn't so much a class as it is a module-like namespace.

509

It is instantiated once, and simulates having a GnuTLS module."""

510

511

library = ctypes.util.find_library("gnutls")

512

if library is None:

513

library = ctypes.util.find_library("gnutls-deb0")

514

_library = ctypes.cdll.LoadLibrary(library)

515

del library

516

_need_version = b"3.3.0"

517

_tls_rawpk_version = b"3.6.6"

518

519

def __init__(self):

520

# Need to use "self" here, since this method is called before

521

# the assignment to the "gnutls" global variable happens.

522

if self.check_version(self._need_version) is None:

523

raise self.Error("Needs GnuTLS {} or later"

524

.format(self._need_version))

525

526

# Unless otherwise indicated, the constants and types below are

527

# all from the gnutls/gnutls.h C header file.

528

529

# Constants

530

E_SUCCESS = 0

531

E_INTERRUPTED = -52

532

E_AGAIN = -28

533

CRT_OPENPGP = 2

534

CRT_RAWPK = 3

535

CLIENT = 2

536

SHUT_RDWR = 0

537

CRD_CERTIFICATE = 1

538

E_NO_CERTIFICATE_FOUND = -49

539

X509_FMT_DER = 0

540

NO_TICKETS = 1<<10

541

ENABLE_RAWPK = 1<<18

542

CTYPE_PEERS = 3

543

KEYID_USE_SHA256 = 1 # gnutls/x509.h

544

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

545

546

# Types

547

class session_int(ctypes.Structure):

548

_fields_ = []

549

session_t = ctypes.POINTER(session_int)

550

551

class certificate_credentials_st(ctypes.Structure):

552

_fields_ = []

553

certificate_credentials_t = ctypes.POINTER(

554

certificate_credentials_st)

555

certificate_type_t = ctypes.c_int

556

557

class datum_t(ctypes.Structure):

558

_fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),

559

('size', ctypes.c_uint)]

560

561

class openpgp_crt_int(ctypes.Structure):

562

_fields_ = []

563

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

564

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

565

log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)

566

credentials_type_t = ctypes.c_int

567

transport_ptr_t = ctypes.c_void_p

568

close_request_t = ctypes.c_int

569

570

# Exceptions

571

class Error(Exception):

572

# We need to use the class name "GnuTLS" here, since this

573

# exception might be raised from within GnuTLS.__init__,

574

# which is called before the assignment to the "gnutls"

575

# global variable has happened.

576

def __init__(self, message=None, code=None, args=()):

577

# Default usage is by a message string, but if a return

578

# code is passed, convert it to a string with

579

# gnutls.strerror()

580

self.code = code

581

if message is None and code is not None:

582

message = GnuTLS.strerror(code)

583

return super(GnuTLS.Error, self).__init__(

584

message, *args)

585

586

class CertificateSecurityError(Error):

587

pass

588

589

# Classes

590

class Credentials(object):

591

def __init__(self):

592

self._c_object = gnutls.certificate_credentials_t()

593

gnutls.certificate_allocate_credentials(

594

ctypes.byref(self._c_object))

595

self.type = gnutls.CRD_CERTIFICATE

596

597

def __del__(self):

598

gnutls.certificate_free_credentials(self._c_object)

599

600

class ClientSession(object):

601

def __init__(self, socket, credentials=None):

602

self._c_object = gnutls.session_t()

603

gnutls_flags = gnutls.CLIENT

604

if gnutls.check_version("3.5.6"):

605

gnutls_flags |= gnutls.NO_TICKETS

606

if gnutls.has_rawpk:

607

gnutls_flags |= gnutls.ENABLE_RAWPK

608

gnutls.init(ctypes.byref(self._c_object), gnutls_flags)

609

del gnutls_flags

610

gnutls.set_default_priority(self._c_object)

611

gnutls.transport_set_ptr(self._c_object, socket.fileno())

612

gnutls.handshake_set_private_extensions(self._c_object,

613

True)

614

self.socket = socket

615

if credentials is None:

616

credentials = gnutls.Credentials()

617

gnutls.credentials_set(self._c_object, credentials.type,

618

ctypes.cast(credentials._c_object,

619

ctypes.c_void_p))

620

self.credentials = credentials

621

622

def __del__(self):

623

gnutls.deinit(self._c_object)

624

625

def handshake(self):

626

return gnutls.handshake(self._c_object)

627

628

def send(self, data):

629

data = bytes(data)

630

data_len = len(data)

631

while data_len > 0:

632

data_len -= gnutls.record_send(self._c_object,

633

data[-data_len:],

634

data_len)

635

636

def bye(self):

637

return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)

638

639

# Error handling functions

640

def _error_code(result):

641

"""A function to raise exceptions on errors, suitable

642

for the 'restype' attribute on ctypes functions"""

643

if result >= 0:

644

return result

645

if result == gnutls.E_NO_CERTIFICATE_FOUND:

646

raise gnutls.CertificateSecurityError(code=result)

647

raise gnutls.Error(code=result)

648

649

def _retry_on_error(result, func, arguments):

650

"""A function to retry on some errors, suitable

651

for the 'errcheck' attribute on ctypes functions"""

652

while result < 0:

653

if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):

654

return _error_code(result)

655

result = func(*arguments)

656

return result

657

658

# Unless otherwise indicated, the function declarations below are

659

# all from the gnutls/gnutls.h C header file.

660

661

# Functions

662

priority_set_direct = _library.gnutls_priority_set_direct

663

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

664

ctypes.POINTER(ctypes.c_char_p)]

665

priority_set_direct.restype = _error_code

666

667

init = _library.gnutls_init

668

init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]

669

init.restype = _error_code

670

671

set_default_priority = _library.gnutls_set_default_priority

672

set_default_priority.argtypes = [session_t]

673

set_default_priority.restype = _error_code

674

675

record_send = _library.gnutls_record_send

676

record_send.argtypes = [session_t, ctypes.c_void_p,

677

ctypes.c_size_t]

678

record_send.restype = ctypes.c_ssize_t

679

record_send.errcheck = _retry_on_error

680

681

certificate_allocate_credentials = (

682

_library.gnutls_certificate_allocate_credentials)

683

certificate_allocate_credentials.argtypes = [

684

ctypes.POINTER(certificate_credentials_t)]

685

certificate_allocate_credentials.restype = _error_code

686

687

certificate_free_credentials = (

688

_library.gnutls_certificate_free_credentials)

689

certificate_free_credentials.argtypes = [

690

certificate_credentials_t]

691

certificate_free_credentials.restype = None

692

693

handshake_set_private_extensions = (

694

_library.gnutls_handshake_set_private_extensions)

695

handshake_set_private_extensions.argtypes = [session_t,

696

ctypes.c_int]

697

handshake_set_private_extensions.restype = None

698

699

credentials_set = _library.gnutls_credentials_set

700

credentials_set.argtypes = [session_t, credentials_type_t,

701

ctypes.c_void_p]

702

credentials_set.restype = _error_code

703

704

strerror = _library.gnutls_strerror

705

strerror.argtypes = [ctypes.c_int]

706

strerror.restype = ctypes.c_char_p

707

708

certificate_type_get = _library.gnutls_certificate_type_get

709

certificate_type_get.argtypes = [session_t]

710

certificate_type_get.restype = _error_code

711

712

certificate_get_peers = _library.gnutls_certificate_get_peers

713

certificate_get_peers.argtypes = [session_t,

714

ctypes.POINTER(ctypes.c_uint)]

715

certificate_get_peers.restype = ctypes.POINTER(datum_t)

716

717

global_set_log_level = _library.gnutls_global_set_log_level

718

global_set_log_level.argtypes = [ctypes.c_int]

719

global_set_log_level.restype = None

720

721

global_set_log_function = _library.gnutls_global_set_log_function

722

global_set_log_function.argtypes = [log_func]

723

global_set_log_function.restype = None

724

725

deinit = _library.gnutls_deinit

726

deinit.argtypes = [session_t]

727

deinit.restype = None

728

729

handshake = _library.gnutls_handshake

730

handshake.argtypes = [session_t]

731

handshake.restype = _error_code

732

handshake.errcheck = _retry_on_error

733

734

transport_set_ptr = _library.gnutls_transport_set_ptr

735

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

736

transport_set_ptr.restype = None

737

738

bye = _library.gnutls_bye

739

bye.argtypes = [session_t, close_request_t]

740

bye.restype = _error_code

741

bye.errcheck = _retry_on_error

742

743

check_version = _library.gnutls_check_version

744

check_version.argtypes = [ctypes.c_char_p]

745

check_version.restype = ctypes.c_char_p

746

747

has_rawpk = bool(check_version(_tls_rawpk_version))

748

749

if has_rawpk:

750

# Types

751

class pubkey_st(ctypes.Structure):

752

_fields = []

753

pubkey_t = ctypes.POINTER(pubkey_st)

754

755

x509_crt_fmt_t = ctypes.c_int

756

757

# All the function declarations below are from gnutls/abstract.h

758

pubkey_init = _library.gnutls_pubkey_init

759

pubkey_init.argtypes = [ctypes.POINTER(pubkey_t)]

760

pubkey_init.restype = _error_code

761

762

pubkey_import = _library.gnutls_pubkey_import

763

pubkey_import.argtypes = [pubkey_t, ctypes.POINTER(datum_t),

764

x509_crt_fmt_t]

765

pubkey_import.restype = _error_code

766

767

pubkey_get_key_id = _library.gnutls_pubkey_get_key_id

768

pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,

769

ctypes.POINTER(ctypes.c_ubyte),

770

ctypes.POINTER(ctypes.c_size_t)]

771

pubkey_get_key_id.restype = _error_code

772

773

pubkey_deinit = _library.gnutls_pubkey_deinit

774

pubkey_deinit.argtypes = [pubkey_t]

775

pubkey_deinit.restype = None

776

else:

777

# All the function declarations below are from gnutls/openpgp.h

778

779

openpgp_crt_init = _library.gnutls_openpgp_crt_init

780

openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]

781

openpgp_crt_init.restype = _error_code

782

783

openpgp_crt_import = _library.gnutls_openpgp_crt_import

784

openpgp_crt_import.argtypes = [openpgp_crt_t,

785

ctypes.POINTER(datum_t),

786

openpgp_crt_fmt_t]

787

openpgp_crt_import.restype = _error_code

788

789

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

790

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

791

ctypes.POINTER(ctypes.c_uint)]

792

openpgp_crt_verify_self.restype = _error_code

793

794

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

795

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

796

openpgp_crt_deinit.restype = None

797

798

openpgp_crt_get_fingerprint = (

799

_library.gnutls_openpgp_crt_get_fingerprint)

800

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

801

ctypes.c_void_p,

802

ctypes.POINTER(

803

ctypes.c_size_t)]

804

openpgp_crt_get_fingerprint.restype = _error_code

805

806

if check_version("3.6.4"):

807

certificate_type_get2 = _library.gnutls_certificate_type_get2

808

certificate_type_get2.argtypes = [session_t, ctypes.c_int]

809

certificate_type_get2.restype = _error_code

810

811

# Remove non-public functions

812

del _error_code, _retry_on_error

813

# Create the global "gnutls" object, simulating a module

814

gnutls = GnuTLS()

815

816

817

438

def call_pipe(connection, # : multiprocessing.Connection

818

439

func, *args, **kwargs):

819

440

"""This function is meant to be called by multiprocessing.Process

820

441

821

442

This function runs func(*args, **kwargs), and writes the resulting

822

443

return value on the provided multiprocessing.Connection.

823

444

"""

824

445

connection.send(func(*args, **kwargs))

825

446

connection.close()

826

447

827

828

448

class Client(object):

829

449

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

830

450

831

451

Attributes:

832

452

approved: bool(); 'None' if not yet approved/disapproved

833

453

approval_delay: datetime.timedelta(); Time to wait for approval

835

455

checker: subprocess.Popen(); a running checker process used

836

456

to see if the client lives.

837

457

'None' if no process is running.

838

checker_callback_tag: a GLib event source tag, or None

458

checker_callback_tag: a gobject event source tag, or None

839

459

checker_command: string; External command which is run to check

840

460

if client lives. %() expansions are done at

841

461

runtime with vars(self) as dict, so that for

842

462

instance %(name)s can be used in the command.

843

checker_initiator_tag: a GLib event source tag, or None

463

checker_initiator_tag: a gobject event source tag, or None

844

464

created: datetime.datetime(); (UTC) object creation

845

465

client_structure: Object describing what attributes a client has

846

466

and is used for storing the client at exit

847

467

current_checker_command: string; current running checker_command

848

disable_initiator_tag: a GLib event source tag, or None

468

disable_initiator_tag: a gobject event source tag, or None

849

469

enabled: bool()

850

470

fingerprint: string (40 or 32 hexadecimal digits); used to

851

uniquely identify an OpenPGP client

852

key_id: string (64 hexadecimal digits); used to uniquely identify

853

a client using raw public keys

471

uniquely identify the client

854

472

host: string; available for use by the checker command

855

473

interval: datetime.timedelta(); How often to start a new checker

856

474

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

872

490

disabled, or None

873

491

server_settings: The server_settings dict from main()

874

492

"""

875

493

876

494

runtime_expansions = ("approval_delay", "approval_duration",

877

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

495

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

878

496

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

879

497

"last_approval_request", "last_checked_ok",

880

498

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

889

507

"approved_by_default": "True",

890

508

"enabled": "True",

891

509

}

892

510

893

511

@staticmethod

894

512

def config_parser(config):

895

513

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

902

520

for client_name in config.sections():

903

521

section = dict(config.items(client_name))

904

522

client = settings[client_name] = {}

905

523

906

524

client["host"] = section["host"]

907

525

# Reformat values from string types to Python types

908

526

client["approved_by_default"] = config.getboolean(

909

527

client_name, "approved_by_default")

910

528

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

911

529

"enabled")

912

913

# Uppercase and remove spaces from key_id and fingerprint

914

# for later comparison purposes with return value from the

915

# key_id() and fingerprint() functions

916

client["key_id"] = (section.get("key_id", "").upper()

917

.replace(" ", ""))

530

531

# Uppercase and remove spaces from fingerprint for later

532

# comparison purposes with return value from the

533

# fingerprint() function

918

534

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

919

535

.replace(" ", ""))

920

536

if "secret" in section:

921

client["secret"] = codecs.decode(section["secret"]

922

.encode("utf-8"),

923

"base64")

537

client["secret"] = section["secret"].decode("base64")

924

538

elif "secfile" in section:

925

539

with open(os.path.expanduser(os.path.expandvars

926

540

(section["secfile"])),

941

555

client["last_approval_request"] = None

942

556

client["last_checked_ok"] = None

943

557

client["last_checker_status"] = -2

944

558

945

559

return settings

946

947

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

560

561

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

948

562

self.name = name

949

563

if server_settings is None:

950

564

server_settings = {}

952

566

# adding all client settings

953

567

for setting, value in settings.items():

954

568

setattr(self, setting, value)

955

569

956

570

if self.enabled:

957

571

if not hasattr(self, "last_enabled"):

958

572

self.last_enabled = datetime.datetime.utcnow()

962

576

else:

963

577

self.last_enabled = None

964

578

self.expires = None

965

579

966

580

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

967

logger.debug(" Key ID: %s", self.key_id)

968

581

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

969

582

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

970

583

datetime.datetime.utcnow())

971

584

972

585

# attributes specific for this server instance

973

586

self.checker = None

974

587

self.checker_initiator_tag = None

980

593

self.changedstate = multiprocessing_manager.Condition(

981

594

multiprocessing_manager.Lock())

982

595

self.client_structure = [attr

983

for attr in self.__dict__.keys()

596

for attr in self.__dict__.iterkeys()

984

597

if not attr.startswith("_")]

985

598

self.client_structure.append("client_structure")

986

599

987

600

for name, t in inspect.getmembers(

988

601

type(self), lambda obj: isinstance(obj, property)):

989

602

if not name.startswith("_"):

990

603

self.client_structure.append(name)

991

604

992

605

# Send notice to process children that client state has changed

993

606

def send_changedstate(self):

994

607

with self.changedstate:

995

608

self.changedstate.notify_all()

996

609

997

610

def enable(self):

998

611

"""Start this client's checker and timeout hooks"""

999

612

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

1004

617

self.last_enabled = datetime.datetime.utcnow()

1005

618

self.init_checker()

1006

619

self.send_changedstate()

1007

620

1008

621

def disable(self, quiet=True):

1009

622

"""Disable this client."""

1010

623

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

1012

625

if not quiet:

1013

626

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

1014

627

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

1015

GLib.source_remove(self.disable_initiator_tag)

628

gobject.source_remove(self.disable_initiator_tag)

1016

629

self.disable_initiator_tag = None

1017

630

self.expires = None

1018

631

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

1019

GLib.source_remove(self.checker_initiator_tag)

632

gobject.source_remove(self.checker_initiator_tag)

1020

633

self.checker_initiator_tag = None

1021

634

self.stop_checker()

1022

635

self.enabled = False

1023

636

if not quiet:

1024

637

self.send_changedstate()

1025

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

638

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

1026

639

return False

1027

640

1028

641

def __del__(self):

1029

642

self.disable()

1030

643

1031

644

def init_checker(self):

1032

645

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

1033

646

# and every interval from then on.

1034

647

if self.checker_initiator_tag is not None:

1035

GLib.source_remove(self.checker_initiator_tag)

1036

self.checker_initiator_tag = GLib.timeout_add(

648

gobject.source_remove(self.checker_initiator_tag)

649

self.checker_initiator_tag = gobject.timeout_add(

1037

650

int(self.interval.total_seconds() * 1000),

1038

651

self.start_checker)

1039

652

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

1040

653

if self.disable_initiator_tag is not None:

1041

GLib.source_remove(self.disable_initiator_tag)

1042

self.disable_initiator_tag = GLib.timeout_add(

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = gobject.timeout_add(

1043

656

int(self.timeout.total_seconds() * 1000), self.disable)

1044

657

# Also start a new checker *right now*.

1045

658

self.start_checker()

1046

659

1047

660

def checker_callback(self, source, condition, connection,

1048

661

command):

1049

662

"""The checker has completed, so take appropriate actions."""

1052

665

# Read return code from connection (see call_pipe)

1053

666

returncode = connection.recv()

1054

667

connection.close()

1055

668

1056

669

if returncode >= 0:

1057

670

self.last_checker_status = returncode

1058

671

self.last_checker_signal = None

1068

681

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

1069

682

vars(self))

1070

683

return False

1071

684

1072

685

def checked_ok(self):

1073

686

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

1074

687

self.last_checked_ok = datetime.datetime.utcnow()

1075

688

self.last_checker_status = 0

1076

689

self.last_checker_signal = None

1077

690

self.bump_timeout()

1078

691

1079

692

def bump_timeout(self, timeout=None):

1080

693

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

1081

694

if timeout is None:

1082

695

timeout = self.timeout

1083

696

if self.disable_initiator_tag is not None:

1084

GLib.source_remove(self.disable_initiator_tag)

697

gobject.source_remove(self.disable_initiator_tag)

1085

698

self.disable_initiator_tag = None

1086

699

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

1087

self.disable_initiator_tag = GLib.timeout_add(

700

self.disable_initiator_tag = gobject.timeout_add(

1088

701

int(timeout.total_seconds() * 1000), self.disable)

1089

702

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

1090

703

1091

704

def need_approval(self):

1092

705

self.last_approval_request = datetime.datetime.utcnow()

1093

706

1094

707

def start_checker(self):

1095

708

"""Start a new checker subprocess if one is not running.

1096

709

1097

710

If a checker already exists, leave it running and do

1098

711

nothing."""

1099

712

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

1104

717

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

1105

718

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

1106

719

# should be.

1107

720

1108

721

if self.checker is not None and not self.checker.is_alive():

1109

722

logger.warning("Checker was not alive; joining")

1110

723

self.checker.join()

1114

727

# Escape attributes for the shell

1115

728

escaped_attrs = {

1116

729

attr: re.escape(str(getattr(self, attr)))

1117

for attr in self.runtime_expansions}

730

for attr in self.runtime_expansions }

1118

731

try:

1119

732

command = self.checker_command % escaped_attrs

1120

733

except TypeError as error:

1132

745

# The exception is when not debugging but nevertheless

1133

746

# running in the foreground; use the previously

1134

747

# created wnull.

1135

popen_args = {"close_fds": True,

1136

"shell": True,

1137

"cwd": "/"}

748

popen_args = { "close_fds": True,

749

"shell": True,

750

"cwd": "/" }

1138

751

if (not self.server_settings["debug"]

1139

752

and self.server_settings["foreground"]):

1140

753

popen_args.update({"stdout": wnull,

1141

"stderr": wnull})

1142

pipe = multiprocessing.Pipe(duplex=False)

754

"stderr": wnull })

755

pipe = multiprocessing.Pipe(duplex = False)

1143

756

self.checker = multiprocessing.Process(

1144

target=call_pipe,

1145

args=(pipe[1], subprocess.call, command),

1146

kwargs=popen_args)

757

target = call_pipe,

758

args = (pipe[1], subprocess.call, command),

759

kwargs = popen_args)

1147

760

self.checker.start()

1148

self.checker_callback_tag = GLib.io_add_watch(

1149

pipe[0].fileno(), GLib.IO_IN,

761

self.checker_callback_tag = gobject.io_add_watch(

762

pipe[0].fileno(), gobject.IO_IN,

1150

763

self.checker_callback, pipe[0], command)

1151

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

764

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

1152

765

return True

1153

766

1154

767

def stop_checker(self):

1155

768

"""Force the checker process, if any, to stop."""

1156

769

if self.checker_callback_tag:

1157

GLib.source_remove(self.checker_callback_tag)

770

gobject.source_remove(self.checker_callback_tag)

1158

771

self.checker_callback_tag = None

1159

772

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

1160

773

return

1169

782

byte_arrays=False):

1170

783

"""Decorators for marking methods of a DBusObjectWithProperties to

1171

784

become properties on the D-Bus.

1172

785

1173

786

The decorated method will be called with no arguments by "Get"

1174

787

and with one argument by "Set".

1175

788

1176

789

The parameters, where they are supported, are the same as

1177

790

dbus.service.method, except there is only "signature", since the

1178

791

type from Get() and the type sent to Set() is the same.

1182

795

if byte_arrays and signature != "ay":

1183

796

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

1184

797

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

1185

798

1186

799

def decorator(func):

1187

800

func._dbus_is_property = True

1188

801

func._dbus_interface = dbus_interface

1191

804

func._dbus_name = func.__name__

1192

805

if func._dbus_name.endswith("_dbus_property"):

1193

806

func._dbus_name = func._dbus_name[:-14]

1194

func._dbus_get_args_options = {'byte_arrays': byte_arrays}

807

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

1195

808

return func

1196

809

1197

810

return decorator

1198

811

1199

812

1200

813

def dbus_interface_annotations(dbus_interface):

1201

814

"""Decorator for marking functions returning interface annotations

1202

815

1203

816

Usage:

1204

817

1205

818

@dbus_interface_annotations("org.example.Interface")

1206

819

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

1207

820

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

1208

821

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

1209

822

"false"}

1210

823

"""

1211

824

1212

825

def decorator(func):

1213

826

func._dbus_is_interface = True

1214

827

func._dbus_interface = dbus_interface

1215

828

func._dbus_name = dbus_interface

1216

829

return func

1217

830

1218

831

return decorator

1219

832

1220

833

1221

834

def dbus_annotations(annotations):

1222

835

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

1223

836

Usage:

1224

837

1225

838

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

1226

839

"org.freedesktop.DBus.Property."

1227

840

"EmitsChangedSignal": "false"})

1229

842

access="r")

1230

843

def Property_dbus_property(self):

1231

844

return dbus.Boolean(False)

1232

845

1233

846

See also the DBusObjectWithAnnotations class.

1234

847

"""

1235

848

1236

849

def decorator(func):

1237

850

func._dbus_annotations = annotations

1238

851

return func

1239

852

1240

853

return decorator

1241

854

1242

855

1260

873

1261

874

class DBusObjectWithAnnotations(dbus.service.Object):

1262

875

"""A D-Bus object with annotations.

1263

876

1264

877

Classes inheriting from this can use the dbus_annotations

1265

878

decorator to add annotations to methods or signals.

1266

879

"""

1267

880

1268

881

@staticmethod

1269

882

def _is_dbus_thing(thing):

1270

883

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

1271

884

1272

885

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

1273

886

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

1274

887

"""

1275

888

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

1276

889

False)

1277

890

1278

891

def _get_all_dbus_things(self, thing):

1279

892

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

1280

893

"""

1283

896

for cls in self.__class__.__mro__

1284

897

for name, athing in

1285

898

inspect.getmembers(cls, self._is_dbus_thing(thing)))

1286

899

1287

900

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1288

out_signature="s",

1289

path_keyword='object_path',

1290

connection_keyword='connection')

901

out_signature = "s",

902

path_keyword = 'object_path',

903

connection_keyword = 'connection')

1291

904

def Introspect(self, object_path, connection):

1292

905

"""Overloading of standard D-Bus method.

1293

906

1294

907

Inserts annotation tags on methods and signals.

1295

908

"""

1296

909

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

1297

910

connection)

1298

911

try:

1299

912

document = xml.dom.minidom.parseString(xmlstring)

1300

913

1301

914

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

1302

915

# Add annotation tags

1303

916

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

1330

943

if_tag.appendChild(ann_tag)

1331

944

# Fix argument name for the Introspect method itself

1332

945

if (if_tag.getAttribute("name")

1333

== dbus.INTROSPECTABLE_IFACE):

946

== dbus.INTROSPECTABLE_IFACE):

1334

947

for cn in if_tag.getElementsByTagName("method"):

1335

948

if cn.getAttribute("name") == "Introspect":

1336

949

for arg in cn.getElementsByTagName("arg"):

1349

962

1350

963

class DBusObjectWithProperties(DBusObjectWithAnnotations):

1351

964

"""A D-Bus object with properties.

1352

965

1353

966

Classes inheriting from this can use the dbus_service_property

1354

967

decorator to expose methods as D-Bus properties. It exposes the

1355

968

standard Get(), Set(), and GetAll() methods on the D-Bus.

1356

969

"""

1357

970

1358

971

def _get_dbus_property(self, interface_name, property_name):

1359

972

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

1360

973

property with the specified name and interface.

1365

978

if (value._dbus_name == property_name

1366

979

and value._dbus_interface == interface_name):

1367

980

return value.__get__(self)

1368

981

1369

982

# No such property

1370

983

raise DBusPropertyNotFound("{}:{}.{}".format(

1371

984

self.dbus_object_path, interface_name, property_name))

1372

985

1373

986

@classmethod

1374

987

def _get_all_interface_names(cls):

1375

988

"""Get a sequence of all interfaces supported by an object"""

1378

991

for x in (inspect.getmro(cls))

1379

992

for attr in dir(x))

1380

993

if name is not None)

1381

994

1382

995

@dbus.service.method(dbus.PROPERTIES_IFACE,

1383

996

in_signature="ss",

1384

997

out_signature="v")

1392

1005

if not hasattr(value, "variant_level"):

1393

1006

return value

1394

1007

return type(value)(value, variant_level=value.variant_level+1)

1395

1008

1396

1009

@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")

1397

1010

def Set(self, interface_name, property_name, value):

1398

1011

"""Standard D-Bus property Set() method, see D-Bus standard.

1410

1023

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

1411

1024

for byte in value))

1412

1025

prop(value)

1413

1026

1414

1027

@dbus.service.method(dbus.PROPERTIES_IFACE,

1415

1028

in_signature="s",

1416

1029

out_signature="a{sv}")

1417

1030

def GetAll(self, interface_name):

1418

1031

"""Standard D-Bus property GetAll() method, see D-Bus

1419

1032

standard.

1420

1033

1421

1034

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

1422

1035

"""

1423

1036

properties = {}

1434

1047

properties[name] = value

1435

1048

continue

1436

1049

properties[name] = type(value)(

1437

value, variant_level=value.variant_level + 1)

1050

value, variant_level = value.variant_level + 1)

1438

1051

return dbus.Dictionary(properties, signature="sv")

1439

1052

1440

1053

@dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")

1441

1054

def PropertiesChanged(self, interface_name, changed_properties,

1442

1055

invalidated_properties):

1444

1057

standard.

1445

1058

"""

1446

1059

pass

1447

1060

1448

1061

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1449

1062

out_signature="s",

1450

1063

path_keyword='object_path',

1451

1064

connection_keyword='connection')

1452

1065

def Introspect(self, object_path, connection):

1453

1066

"""Overloading of standard D-Bus method.

1454

1067

1455

1068

Inserts property tags and interface annotation tags.

1456

1069

"""

1457

1070

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1459

1072

connection)

1460

1073

try:

1461

1074

document = xml.dom.minidom.parseString(xmlstring)

1462

1075

1463

1076

def make_tag(document, name, prop):

1464

1077

e = document.createElement("property")

1465

1078

e.setAttribute("name", name)

1466

1079

e.setAttribute("type", prop._dbus_signature)

1467

1080

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

1468

1081

return e

1469

1082

1470

1083

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

1471

1084

# Add property tags

1472

1085

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

1514

1127

exc_info=error)

1515

1128

return xmlstring

1516

1129

1517

1518

1130

try:

1519

1131

dbus.OBJECT_MANAGER_IFACE

1520

1132

except AttributeError:

1521

1133

dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"

1522

1134

1523

1524

1135

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1525

1136

"""A D-Bus object with an ObjectManager.

1526

1137

1527

1138

Classes inheriting from this exposes the standard

1528

1139

GetManagedObjects call and the InterfacesAdded and

1529

1140

InterfacesRemoved signals on the standard

1530

1141

"org.freedesktop.DBus.ObjectManager" interface.

1531

1142

1532

1143

Note: No signals are sent automatically; they must be sent

1533

1144

manually.

1534

1145

"""

1535

1146

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1536

out_signature="a{oa{sa{sv}}}")

1147

out_signature = "a{oa{sa{sv}}}")

1537

1148

def GetManagedObjects(self):

1538

1149

"""This function must be overridden"""

1539

1150

raise NotImplementedError()

1540

1151

1541

1152

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1542

signature="oa{sa{sv}}")

1153

signature = "oa{sa{sv}}")

1543

1154

def InterfacesAdded(self, object_path, interfaces_and_properties):

1544

1155

pass

1545

1546

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature="oas")

1156

1157

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature = "oas")

1547

1158

def InterfacesRemoved(self, object_path, interfaces):

1548

1159

pass

1549

1160

1550

1161

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1551

out_signature="s",

1552

path_keyword='object_path',

1553

connection_keyword='connection')

1162

out_signature = "s",

1163

path_keyword = 'object_path',

1164

connection_keyword = 'connection')

1554

1165

def Introspect(self, object_path, connection):

1555

1166

"""Overloading of standard D-Bus method.

1556

1167

1557

1168

Override return argument name of GetManagedObjects to be

1558

1169

"objpath_interfaces_and_properties"

1559

1170

"""

1562

1173

connection)

1563

1174

try:

1564

1175

document = xml.dom.minidom.parseString(xmlstring)

1565

1176

1566

1177

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

1567

1178

# Fix argument name for the GetManagedObjects method

1568

1179

if (if_tag.getAttribute("name")

1569

== dbus.OBJECT_MANAGER_IFACE):

1180

== dbus.OBJECT_MANAGER_IFACE):

1570

1181

for cn in if_tag.getElementsByTagName("method"):

1571

1182

if (cn.getAttribute("name")

1572

1183

== "GetManagedObjects"):

1582

1193

except (AttributeError, xml.dom.DOMException,

1583

1194

xml.parsers.expat.ExpatError) as error:

1584

1195

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

1585

exc_info=error)

1196

exc_info = error)

1586

1197

return xmlstring

1587

1198

1588

1589

1199

def datetime_to_dbus(dt, variant_level=0):

1590

1200

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

1591

1201

if dt is None:

1592

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

1202

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

1593

1203

return dbus.String(dt.isoformat(), variant_level=variant_level)

1594

1204

1595

1205

1598

1208

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

1599

1209

interface names according to the "alt_interface_names" mapping.

1600

1210

Usage:

1601

1211

1602

1212

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

1603

1213

"net.example.AlternateInterface"})

1604

1214

class SampleDBusObject(dbus.service.Object):

1605

1215

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

1606

1216

def SampleDBusMethod():

1607

1217

pass

1608

1218

1609

1219

The above "SampleDBusMethod" on "SampleDBusObject" will be

1610

1220

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

1611

1221

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

1612

1222

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

1613

1223

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

1614

1224

1615

1225

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

1616

1226

(from DBusObjectWithProperties) and interfaces (from the

1617

1227

dbus_interface_annotations decorator).

1618

1228

"""

1619

1229

1620

1230

def wrapper(cls):

1621

1231

for orig_interface_name, alt_interface_name in (

1622

1232

alt_interface_names.items()):

1637

1247

interface_names.add(alt_interface)

1638

1248

# Is this a D-Bus signal?

1639

1249

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

1640

# Extract the original non-method undecorated

1641

# function by black magic

1642

1250

if sys.version_info.major == 2:

1251

# Extract the original non-method undecorated

1252

# function by black magic

1643

1253

nonmethod_func = (dict(

1644

1254

zip(attribute.func_code.co_freevars,

1645

1255

attribute.__closure__))

1646

1256

["func"].cell_contents)

1647

1257

else:

1648

nonmethod_func = (dict(

1649

zip(attribute.__code__.co_freevars,

1650

attribute.__closure__))

1651

["func"].cell_contents)

1258

nonmethod_func = attribute

1652

1259

# Create a new, but exactly alike, function

1653

1260

# object, and decorate it to be a new D-Bus signal

1654

1261

# with the alternate D-Bus interface name

1655

new_function = copy_function(nonmethod_func)

1262

if sys.version_info.major == 2:

1263

new_function = types.FunctionType(

1264

nonmethod_func.func_code,

1265

nonmethod_func.func_globals,

1266

nonmethod_func.func_name,

1267

nonmethod_func.func_defaults,

1268

nonmethod_func.func_closure)

1269

else:

1270

new_function = types.FunctionType(

1271

nonmethod_func.__code__,

1272

nonmethod_func.__globals__,

1273

nonmethod_func.__name__,

1274

nonmethod_func.__defaults__,

1275

nonmethod_func.__closure__)

1656

1276

new_function = (dbus.service.signal(

1657

1277

alt_interface,

1658

1278

attribute._dbus_signature)(new_function))

1662

1282

attribute._dbus_annotations)

1663

1283

except AttributeError:

1664

1284

pass

1665

1666

1285

# Define a creator of a function to call both the

1667

1286

# original and alternate functions, so both the

1668

1287

# original and alternate signals gets sent when

1671

1290

"""This function is a scope container to pass

1672

1291

func1 and func2 to the "call_both" function

1673

1292

outside of its arguments"""

1674

1293

1675

1294

@functools.wraps(func2)

1676

1295

def call_both(*args, **kwargs):

1677

1296

"""This function will emit two D-Bus

1678

1297

signals by calling func1 and func2"""

1679

1298

func1(*args, **kwargs)

1680

1299

func2(*args, **kwargs)

1681

# Make wrapper function look like a D-Bus

1682

# signal

1300

# Make wrapper function look like a D-Bus signal

1683

1301

for name, attr in inspect.getmembers(func2):

1684

1302

if name.startswith("_dbus_"):

1685

1303

setattr(call_both, name, attr)

1686

1304

1687

1305

return call_both

1688

1306

# Create the "call_both" function and add it to

1689

1307

# the class

1699

1317

alt_interface,

1700

1318

attribute._dbus_in_signature,

1701

1319

attribute._dbus_out_signature)

1702

(copy_function(attribute)))

1320

(types.FunctionType(attribute.func_code,

1321

attribute.func_globals,

1322

attribute.func_name,

1323

attribute.func_defaults,

1324

attribute.func_closure)))

1703

1325

# Copy annotations, if any

1704

1326

try:

1705

1327

attr[attrname]._dbus_annotations = dict(

1717

1339

attribute._dbus_access,

1718

1340

attribute._dbus_get_args_options

1719

1341

["byte_arrays"])

1720

(copy_function(attribute)))

1342

(types.FunctionType(

1343

attribute.func_code,

1344

attribute.func_globals,

1345

attribute.func_name,

1346

attribute.func_defaults,

1347

attribute.func_closure)))

1721

1348

# Copy annotations, if any

1722

1349

try:

1723

1350

attr[attrname]._dbus_annotations = dict(

1732

1359

# to the class.

1733

1360

attr[attrname] = (

1734

1361

dbus_interface_annotations(alt_interface)

1735

(copy_function(attribute)))

1362

(types.FunctionType(attribute.func_code,

1363

attribute.func_globals,

1364

attribute.func_name,

1365

attribute.func_defaults,

1366

attribute.func_closure)))

1736

1367

if deprecate:

1737

1368

# Deprecate all alternate interfaces

1738

iname = "_AlternateDBusNames_interface_annotation{}"

1369

iname="_AlternateDBusNames_interface_annotation{}"

1739

1370

for interface_name in interface_names:

1740

1371

1741

1372

@dbus_interface_annotations(interface_name)

1742

1373

def func(self):

1743

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

1744

"true"}

1374

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

1375

"true" }

1745

1376

# Find an unused name

1746

1377

for aname in (iname.format(i)

1747

1378

for i in itertools.count()):

1751

1382

if interface_names:

1752

1383

# Replace the class with a new subclass of it with

1753

1384

# methods, signals, etc. as created above.

1754

if sys.version_info.major == 2:

1755

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

1756

(cls, ), attr)

1757

else:

1758

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

1759

(cls, ), attr)

1385

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

1386

(cls, ), attr)

1760

1387

return cls

1761

1388

1762

1389

return wrapper

1763

1390

1764

1391

1766

1393

"se.bsnet.fukt.Mandos"})

1767

1394

class ClientDBus(Client, DBusObjectWithProperties):

1768

1395

"""A Client class using D-Bus

1769

1396

1770

1397

Attributes:

1771

1398

dbus_object_path: dbus.ObjectPath

1772

1399

bus: dbus.SystemBus()

1773

1400

"""

1774

1401

1775

1402

runtime_expansions = (Client.runtime_expansions

1776

1403

+ ("dbus_object_path", ))

1777

1404

1778

1405

_interface = "se.recompile.Mandos.Client"

1779

1406

1780

1407

# dbus.service.Object doesn't use super(), so we can't either.

1781

1782

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

1408

1409

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

1783

1410

self.bus = bus

1784

1411

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

1785

1412

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

1791

1418

"/clients/" + client_object_name)

1792

1419

DBusObjectWithProperties.__init__(self, self.bus,

1793

1420

self.dbus_object_path)

1794

1421

1795

1422

def notifychangeproperty(transform_func, dbus_name,

1796

1423

type_func=lambda x: x,

1797

1424

variant_level=1,

1799

1426

_interface=_interface):

1800

1427

""" Modify a variable so that it's a property which announces

1801

1428

its changes to DBus.

1802

1429

1803

1430

transform_fun: Function that takes a value and a variant_level

1804

1431

and transforms it to a D-Bus type.

1805

1432

dbus_name: D-Bus name of the variable

1808

1435

variant_level: D-Bus variant level. Default: 1

1809

1436

"""

1810

1437

attrname = "_{}".format(dbus_name)

1811

1438

1812

1439

def setter(self, value):

1813

1440

if hasattr(self, "dbus_object_path"):

1814

1441

if (not hasattr(self, attrname) or

1821

1448

else:

1822

1449

dbus_value = transform_func(

1823

1450

type_func(value),

1824

variant_level=variant_level)

1451

variant_level = variant_level)

1825

1452

self.PropertyChanged(dbus.String(dbus_name),

1826

1453

dbus_value)

1827

1454

self.PropertiesChanged(

1828

1455

_interface,

1829

dbus.Dictionary({dbus.String(dbus_name):

1830

dbus_value}),

1456

dbus.Dictionary({ dbus.String(dbus_name):

1457

dbus_value }),

1831

1458

dbus.Array())

1832

1459

setattr(self, attrname, value)

1833

1460

1834

1461

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

1835

1462

1836

1463

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1837

1464

approvals_pending = notifychangeproperty(dbus.Boolean,

1838

1465

"ApprovalPending",

1839

type_func=bool)

1466

type_func = bool)

1840

1467

enabled = notifychangeproperty(dbus.Boolean, "Enabled")

1841

1468

last_enabled = notifychangeproperty(datetime_to_dbus,

1842

1469

"LastEnabled")

1843

1470

checker = notifychangeproperty(

1844

1471

dbus.Boolean, "CheckerRunning",

1845

type_func=lambda checker: checker is not None)

1472

type_func = lambda checker: checker is not None)

1846

1473

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1847

1474

"LastCheckedOK")

1848

1475

last_checker_status = notifychangeproperty(dbus.Int16,

1853

1480

"ApprovedByDefault")

1854

1481

approval_delay = notifychangeproperty(

1855

1482

dbus.UInt64, "ApprovalDelay",

1856

type_func=lambda td: td.total_seconds() * 1000)

1483

type_func = lambda td: td.total_seconds() * 1000)

1857

1484

approval_duration = notifychangeproperty(

1858

1485

dbus.UInt64, "ApprovalDuration",

1859

type_func=lambda td: td.total_seconds() * 1000)

1486

type_func = lambda td: td.total_seconds() * 1000)

1860

1487

host = notifychangeproperty(dbus.String, "Host")

1861

1488

timeout = notifychangeproperty(

1862

1489

dbus.UInt64, "Timeout",

1863

type_func=lambda td: td.total_seconds() * 1000)

1490

type_func = lambda td: td.total_seconds() * 1000)

1864

1491

extended_timeout = notifychangeproperty(

1865

1492

dbus.UInt64, "ExtendedTimeout",

1866

type_func=lambda td: td.total_seconds() * 1000)

1493

type_func = lambda td: td.total_seconds() * 1000)

1867

1494

interval = notifychangeproperty(

1868

1495

dbus.UInt64, "Interval",

1869

type_func=lambda td: td.total_seconds() * 1000)

1496

type_func = lambda td: td.total_seconds() * 1000)

1870

1497

checker_command = notifychangeproperty(dbus.String, "Checker")

1871

1498

secret = notifychangeproperty(dbus.ByteArray, "Secret",

1872

1499

invalidate_only=True)

1873

1500

1874

1501

del notifychangeproperty

1875

1502

1876

1503

def __del__(self, *args, **kwargs):

1877

1504

try:

1878

1505

self.remove_from_connection()

1881

1508

if hasattr(DBusObjectWithProperties, "__del__"):

1882

1509

DBusObjectWithProperties.__del__(self, *args, **kwargs)

1883

1510

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

1884

1511

1885

1512

def checker_callback(self, source, condition,

1886

1513

connection, command, *args, **kwargs):

1887

1514

ret = Client.checker_callback(self, source, condition,

1903

1530

| self.last_checker_signal),

1904

1531

dbus.String(command))

1905

1532

return ret

1906

1533

1907

1534

def start_checker(self, *args, **kwargs):

1908

1535

old_checker_pid = getattr(self.checker, "pid", None)

1909

1536

r = Client.start_checker(self, *args, **kwargs)

1913

1540

# Emit D-Bus signal

1914

1541

self.CheckerStarted(self.current_checker_command)

1915

1542

return r

1916

1543

1917

1544

def _reset_approved(self):

1918

1545

self.approved = None

1919

1546

return False

1920

1547

1921

1548

def approve(self, value=True):

1922

1549

self.approved = value

1923

GLib.timeout_add(int(self.approval_duration.total_seconds()

1924

* 1000), self._reset_approved)

1550

gobject.timeout_add(int(self.approval_duration.total_seconds()

1551

* 1000), self._reset_approved)

1925

1552

self.send_changedstate()

1926

1927

# D-Bus methods, signals & properties

1928

1929

# Interfaces

1930

1931

# Signals

1932

1553

1554

## D-Bus methods, signals & properties

1555

1556

## Interfaces

1557

1558

## Signals

1559

1933

1560

# CheckerCompleted - signal

1934

1561

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

1935

1562

def CheckerCompleted(self, exitcode, waitstatus, command):

1936

1563

"D-Bus signal"

1937

1564

pass

1938

1565

1939

1566

# CheckerStarted - signal

1940

1567

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

1941

1568

def CheckerStarted(self, command):

1942

1569

"D-Bus signal"

1943

1570

pass

1944

1571

1945

1572

# PropertyChanged - signal

1946

1573

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

1947

1574

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

1948

1575

def PropertyChanged(self, property, value):

1949

1576

"D-Bus signal"

1950

1577

pass

1951

1578

1952

1579

# GotSecret - signal

1953

1580

@dbus.service.signal(_interface)

1954

1581

def GotSecret(self):

1957

1584

server to mandos-client

1958

1585

"""

1959

1586

pass

1960

1587

1961

1588

# Rejected - signal

1962

1589

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

1963

1590

def Rejected(self, reason):

1964

1591

"D-Bus signal"

1965

1592

pass

1966

1593

1967

1594

# NeedApproval - signal

1968

1595

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

1969

1596

def NeedApproval(self, timeout, default):

1970

1597

"D-Bus signal"

1971

1598

return self.need_approval()

1972

1973

# Methods

1974

1599

1600

## Methods

1601

1975

1602

# Approve - method

1976

1603

@dbus.service.method(_interface, in_signature="b")

1977

1604

def Approve(self, value):

1978

1605

self.approve(value)

1979

1606

1980

1607

# CheckedOK - method

1981

1608

@dbus.service.method(_interface)

1982

1609

def CheckedOK(self):

1983

1610

self.checked_ok()

1984

1611

1985

1612

# Enable - method

1986

1613

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

1987

1614

@dbus.service.method(_interface)

1988

1615

def Enable(self):

1989

1616

"D-Bus method"

1990

1617

self.enable()

1991

1618

1992

1619

# StartChecker - method

1993

1620

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

1994

1621

@dbus.service.method(_interface)

1995

1622

def StartChecker(self):

1996

1623

"D-Bus method"

1997

1624

self.start_checker()

1998

1625

1999

1626

# Disable - method

2000

1627

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

2001

1628

@dbus.service.method(_interface)

2002

1629

def Disable(self):

2003

1630

"D-Bus method"

2004

1631

self.disable()

2005

1632

2006

1633

# StopChecker - method

2007

1634

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

2008

1635

@dbus.service.method(_interface)

2009

1636

def StopChecker(self):

2010

1637

self.stop_checker()

2011

2012

# Properties

2013

1638

1639

## Properties

1640

2014

1641

# ApprovalPending - property

2015

1642

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

2016

1643

def ApprovalPending_dbus_property(self):

2017

1644

return dbus.Boolean(bool(self.approvals_pending))

2018

1645

2019

1646

# ApprovedByDefault - property

2020

1647

@dbus_service_property(_interface,

2021

1648

signature="b",

2024

1651

if value is None: # get

2025

1652

return dbus.Boolean(self.approved_by_default)

2026

1653

self.approved_by_default = bool(value)

2027

1654

2028

1655

# ApprovalDelay - property

2029

1656

@dbus_service_property(_interface,

2030

1657

signature="t",

2034

1661

return dbus.UInt64(self.approval_delay.total_seconds()

2035

1662

* 1000)

2036

1663

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

2037

1664

2038

1665

# ApprovalDuration - property

2039

1666

@dbus_service_property(_interface,

2040

1667

signature="t",

2044

1671

return dbus.UInt64(self.approval_duration.total_seconds()

2045

1672

* 1000)

2046

1673

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

2047

1674

2048

1675

# Name - property

2049

1676

@dbus_annotations(

2050

1677

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

2051

1678

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

2052

1679

def Name_dbus_property(self):

2053

1680

return dbus.String(self.name)

2054

2055

# KeyID - property

2056

@dbus_annotations(

2057

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

2058

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

2059

def KeyID_dbus_property(self):

2060

return dbus.String(self.key_id)

2061

1681

2062

1682

# Fingerprint - property

2063

1683

@dbus_annotations(

2064

1684

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

2065

1685

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

2066

1686

def Fingerprint_dbus_property(self):

2067

1687

return dbus.String(self.fingerprint)

2068

1688

2069

1689

# Host - property

2070

1690

@dbus_service_property(_interface,

2071

1691

signature="s",

2074

1694

if value is None: # get

2075

1695

return dbus.String(self.host)

2076

1696

self.host = str(value)

2077

1697

2078

1698

# Created - property

2079

1699

@dbus_annotations(

2080

1700

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

2081

1701

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

2082

1702

def Created_dbus_property(self):

2083

1703

return datetime_to_dbus(self.created)

2084

1704

2085

1705

# LastEnabled - property

2086

1706

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

2087

1707

def LastEnabled_dbus_property(self):

2088

1708

return datetime_to_dbus(self.last_enabled)

2089

1709

2090

1710

# Enabled - property

2091

1711

@dbus_service_property(_interface,

2092

1712

signature="b",

2098

1718

self.enable()

2099

1719

else:

2100

1720

self.disable()

2101

1721

2102

1722

# LastCheckedOK - property

2103

1723

@dbus_service_property(_interface,

2104

1724

signature="s",

2108

1728

self.checked_ok()

2109

1729

return

2110

1730

return datetime_to_dbus(self.last_checked_ok)

2111

1731

2112

1732

# LastCheckerStatus - property

2113

1733

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

2114

1734

def LastCheckerStatus_dbus_property(self):

2115

1735

return dbus.Int16(self.last_checker_status)

2116

1736

2117

1737

# Expires - property

2118

1738

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

2119

1739

def Expires_dbus_property(self):

2120

1740

return datetime_to_dbus(self.expires)

2121

1741

2122

1742

# LastApprovalRequest - property

2123

1743

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

2124

1744

def LastApprovalRequest_dbus_property(self):

2125

1745

return datetime_to_dbus(self.last_approval_request)

2126

1746

2127

1747

# Timeout - property

2128

1748

@dbus_service_property(_interface,

2129

1749

signature="t",

2144

1764

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

2145

1765

is None):

2146

1766

return

2147

GLib.source_remove(self.disable_initiator_tag)

2148

self.disable_initiator_tag = GLib.timeout_add(

1767

gobject.source_remove(self.disable_initiator_tag)

1768

self.disable_initiator_tag = gobject.timeout_add(

2149

1769

int((self.expires - now).total_seconds() * 1000),

2150

1770

self.disable)

2151

1771

2152

1772

# ExtendedTimeout - property

2153

1773

@dbus_service_property(_interface,

2154

1774

signature="t",

2158

1778

return dbus.UInt64(self.extended_timeout.total_seconds()

2159

1779

* 1000)

2160

1780

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

2161

1781

2162

1782

# Interval - property

2163

1783

@dbus_service_property(_interface,

2164

1784

signature="t",

2171

1791

return

2172

1792

if self.enabled:

2173

1793

# Reschedule checker run

2174

GLib.source_remove(self.checker_initiator_tag)

2175

self.checker_initiator_tag = GLib.timeout_add(

1794

gobject.source_remove(self.checker_initiator_tag)

1795

self.checker_initiator_tag = gobject.timeout_add(

2176

1796

value, self.start_checker)

2177

self.start_checker() # Start one now, too

2178

1797

self.start_checker() # Start one now, too

1798

2179

1799

# Checker - property

2180

1800

@dbus_service_property(_interface,

2181

1801

signature="s",

2184

1804

if value is None: # get

2185

1805

return dbus.String(self.checker_command)

2186

1806

self.checker_command = str(value)

2187

1807

2188

1808

# CheckerRunning - property

2189

1809

@dbus_service_property(_interface,

2190

1810

signature="b",

2196

1816

self.start_checker()

2197

1817

else:

2198

1818

self.stop_checker()

2199

1819

2200

1820

# ObjectPath - property

2201

1821

@dbus_annotations(

2202

1822

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",

2203

1823

"org.freedesktop.DBus.Deprecated": "true"})

2204

1824

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

2205

1825

def ObjectPath_dbus_property(self):

2206

return self.dbus_object_path # is already a dbus.ObjectPath

2207

1826

return self.dbus_object_path # is already a dbus.ObjectPath

1827

2208

1828

# Secret = property

2209

1829

@dbus_annotations(

2210

1830

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

2215

1835

byte_arrays=True)

2216

1836

def Secret_dbus_property(self, value):

2217

1837

self.secret = bytes(value)

2218

1838

2219

1839

del _interface

2220

1840

2221

1841

2222

1842

class ProxyClient(object):

2223

def __init__(self, child_pipe, key_id, fpr, address):

1843

def __init__(self, child_pipe, fpr, address):

2224

1844

self._pipe = child_pipe

2225

self._pipe.send(('init', key_id, fpr, address))

1845

self._pipe.send(('init', fpr, address))

2226

1846

if not self._pipe.recv():

2227

raise KeyError(key_id or fpr)

2228

1847

raise KeyError(fpr)

1848

2229

1849

def __getattribute__(self, name):

2230

1850

if name == '_pipe':

2231

1851

return super(ProxyClient, self).__getattribute__(name)

2234

1854

if data[0] == 'data':

2235

1855

return data[1]

2236

1856

if data[0] == 'function':

2237

1857

2238

1858

def func(*args, **kwargs):

2239

1859

self._pipe.send(('funcall', name, args, kwargs))

2240

1860

return self._pipe.recv()[1]

2241

1861

2242

1862

return func

2243

1863

2244

1864

def __setattr__(self, name, value):

2245

1865

if name == '_pipe':

2246

1866

return super(ProxyClient, self).__setattr__(name, value)

2249

1869

2250

1870

class ClientHandler(socketserver.BaseRequestHandler, object):

2251

1871

"""A class to handle client connections.

2252

1872

2253

1873

Instantiated once for each connection to handle it.

2254

1874

Note: This will run in its own forked process."""

2255

1875

2256

1876

def handle(self):

2257

1877

with contextlib.closing(self.server.child_pipe) as child_pipe:

2258

1878

logger.info("TCP connection from: %s",

2259

1879

str(self.client_address))

2260

1880

logger.debug("Pipe FD: %d",

2261

1881

self.server.child_pipe.fileno())

2262

2263

session = gnutls.ClientSession(self.request)

2264

2265

# priority = ':'.join(("NONE", "+VERS-TLS1.1",

2266

# "+AES-256-CBC", "+SHA1",

2267

# "+COMP-NULL", "+CTYPE-OPENPGP",

2268

# "+DHE-DSS"))

1882

1883

session = gnutls.connection.ClientSession(

1884

self.request, gnutls.connection .X509Credentials())

1885

1886

# Note: gnutls.connection.X509Credentials is really a

1887

# generic GnuTLS certificate credentials object so long as

1888

# no X.509 keys are added to it. Therefore, we can use it

1889

# here despite using OpenPGP certificates.

1890

1891

#priority = ':'.join(("NONE", "+VERS-TLS1.1",

1892

# "+AES-256-CBC", "+SHA1",

1893

# "+COMP-NULL", "+CTYPE-OPENPGP",

1894

# "+DHE-DSS"))

2269

1895

# Use a fallback default, since this MUST be set.

2270

1896

priority = self.server.gnutls_priority

2271

1897

if priority is None:

2272

1898

priority = "NORMAL"

2273

gnutls.priority_set_direct(session._c_object,

2274

priority.encode("utf-8"),

2275

None)

2276

1899

gnutls.library.functions.gnutls_priority_set_direct(

1900

session._c_object, priority, None)

1901

2277

1902

# Start communication using the Mandos protocol

2278

1903

# Get protocol number

2279

1904

line = self.request.makefile().readline()

2284

1909

except (ValueError, IndexError, RuntimeError) as error:

2285

1910

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

2286

1911

return

2287

1912

2288

1913

# Start GnuTLS connection

2289

1914

try:

2290

1915

session.handshake()

2291

except gnutls.Error as error:

1916

except gnutls.errors.GNUTLSError as error:

2292

1917

logger.warning("Handshake failed: %s", error)

2293

1918

# Do not run session.bye() here: the session is not

2294

1919

# established. Just abandon the request.

2295

1920

return

2296

1921

logger.debug("Handshake succeeded")

2297

1922

2298

1923

approval_required = False

2299

1924

try:

2300

if gnutls.has_rawpk:

2301

fpr = ""

2302

try:

2303

key_id = self.key_id(

2304

self.peer_certificate(session))

2305

except (TypeError, gnutls.Error) as error:

2306

logger.warning("Bad certificate: %s", error)

2307

return

2308

logger.debug("Key ID: %s", key_id)

2309

2310

else:

2311

key_id = ""

2312

try:

2313

fpr = self.fingerprint(

2314

self.peer_certificate(session))

2315

except (TypeError, gnutls.Error) as error:

2316

logger.warning("Bad certificate: %s", error)

2317

return

2318

logger.debug("Fingerprint: %s", fpr)

2319

2320

try:

2321

client = ProxyClient(child_pipe, key_id, fpr,

1925

try:

1926

fpr = self.fingerprint(

1927

self.peer_certificate(session))

1928

except (TypeError,

1929

gnutls.errors.GNUTLSError) as error:

1930

logger.warning("Bad certificate: %s", error)

1931

return

1932

logger.debug("Fingerprint: %s", fpr)

1933

1934

try:

1935

client = ProxyClient(child_pipe, fpr,

2322

1936

self.client_address)

2323

1937

except KeyError:

2324

1938

return

2325

1939

2326

1940

if client.approval_delay:

2327

1941

delay = client.approval_delay

2328

1942

client.approvals_pending += 1

2329

1943

approval_required = True

2330

1944

2331

1945

while True:

2332

1946

if not client.enabled:

2333

1947

logger.info("Client %s is disabled",

2336

1950

# Emit D-Bus signal

2337

1951

client.Rejected("Disabled")

2338

1952

return

2339

1953

2340

1954

if client.approved or not client.approval_delay:

2341

# We are approved or approval is disabled

1955

#We are approved or approval is disabled

2342

1956

break

2343

1957

elif client.approved is None:

2344

1958

logger.info("Client %s needs approval",

2355

1969

# Emit D-Bus signal

2356

1970

client.Rejected("Denied")

2357

1971

return

2358

2359

# wait until timeout or approved

1972

1973

#wait until timeout or approved

2360

1974

time = datetime.datetime.now()

2361

1975

client.changedstate.acquire()

2362

1976

client.changedstate.wait(delay.total_seconds())

2375

1989

break

2376

1990

else:

2377

1991

delay -= time2 - time

2378

2379

try:

2380

session.send(client.secret)

2381

except gnutls.Error as error:

2382

logger.warning("gnutls send failed",

2383

exc_info=error)

2384

return

2385

1992

1993

sent_size = 0

1994

while sent_size < len(client.secret):

1995

try:

1996

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

1997

except gnutls.errors.GNUTLSError as error:

1998

logger.warning("gnutls send failed",

1999

exc_info=error)

2000

return

2001

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

2002

len(client.secret) - (sent_size

2003

+ sent))

2004

sent_size += sent

2005

2386

2006

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

2387

2007

# bump the timeout using extended_timeout

2388

2008

client.bump_timeout(client.extended_timeout)

2389

2009

if self.server.use_dbus:

2390

2010

# Emit D-Bus signal

2391

2011

client.GotSecret()

2392

2012

2393

2013

finally:

2394

2014

if approval_required:

2395

2015

client.approvals_pending -= 1

2396

2016

try:

2397

2017

session.bye()

2398

except gnutls.Error as error:

2018

except gnutls.errors.GNUTLSError as error:

2399

2019

logger.warning("GnuTLS bye failed",

2400

2020

exc_info=error)

2401

2021

2402

2022

@staticmethod

2403

2023

def peer_certificate(session):

2404

"Return the peer's certificate as a bytestring"

2405

try:

2406

cert_type = gnutls.certificate_type_get2(session._c_object,

2407

gnutls.CTYPE_PEERS)

2408

except AttributeError:

2409

cert_type = gnutls.certificate_type_get(session._c_object)

2410

if gnutls.has_rawpk:

2411

valid_cert_types = frozenset((gnutls.CRT_RAWPK,))

2412

else:

2413

valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))

2414

# If not a valid certificate type...

2415

if cert_type not in valid_cert_types:

2416

logger.info("Cert type %r not in %r", cert_type,

2417

valid_cert_types)

2418

# ...return invalid data

2419

return b""

2024

"Return the peer's OpenPGP certificate as a bytestring"

2025

# If not an OpenPGP certificate...

2026

if (gnutls.library.functions.gnutls_certificate_type_get(

2027

session._c_object)

2028

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

2029

# ...do the normal thing

2030

return session.peer_certificate

2420

2031

list_size = ctypes.c_uint(1)

2421

cert_list = (gnutls.certificate_get_peers

2032

cert_list = (gnutls.library.functions

2033

.gnutls_certificate_get_peers

2422

2034

(session._c_object, ctypes.byref(list_size)))

2423

2035

if not bool(cert_list) and list_size.value != 0:

2424

raise gnutls.Error("error getting peer certificate")

2036

raise gnutls.errors.GNUTLSError("error getting peer"

2037

" certificate")

2425

2038

if list_size.value == 0:

2426

2039

return None

2427

2040

cert = cert_list[0]

2428

2041

return ctypes.string_at(cert.data, cert.size)

2429

2430

@staticmethod

2431

def key_id(certificate):

2432

"Convert a certificate bytestring to a hexdigit key ID"

2433

# New GnuTLS "datum" with the public key

2434

datum = gnutls.datum_t(

2435

ctypes.cast(ctypes.c_char_p(certificate),

2436

ctypes.POINTER(ctypes.c_ubyte)),

2437

ctypes.c_uint(len(certificate)))

2438

# XXX all these need to be created in the gnutls "module"

2439

# New empty GnuTLS certificate

2440

pubkey = gnutls.pubkey_t()

2441

gnutls.pubkey_init(ctypes.byref(pubkey))

2442

# Import the raw public key into the certificate

2443

gnutls.pubkey_import(pubkey,

2444

ctypes.byref(datum),

2445

gnutls.X509_FMT_DER)

2446

# New buffer for the key ID

2447

buf = ctypes.create_string_buffer(32)

2448

buf_len = ctypes.c_size_t(len(buf))

2449

# Get the key ID from the raw public key into the buffer

2450

gnutls.pubkey_get_key_id(pubkey,

2451

gnutls.KEYID_USE_SHA256,

2452

ctypes.cast(ctypes.byref(buf),

2453

ctypes.POINTER(ctypes.c_ubyte)),

2454

ctypes.byref(buf_len))

2455

# Deinit the certificate

2456

gnutls.pubkey_deinit(pubkey)

2457

2458

# Convert the buffer to a Python bytestring

2459

key_id = ctypes.string_at(buf, buf_len.value)

2460

# Convert the bytestring to hexadecimal notation

2461

hex_key_id = binascii.hexlify(key_id).upper()

2462

return hex_key_id

2463

2042

2464

2043

@staticmethod

2465

2044

def fingerprint(openpgp):

2466

2045

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2467

2046

# New GnuTLS "datum" with the OpenPGP public key

2468

datum = gnutls.datum_t(

2047

datum = gnutls.library.types.gnutls_datum_t(

2469

2048

ctypes.cast(ctypes.c_char_p(openpgp),

2470

2049

ctypes.POINTER(ctypes.c_ubyte)),

2471

2050

ctypes.c_uint(len(openpgp)))

2472

2051

# New empty GnuTLS certificate

2473

crt = gnutls.openpgp_crt_t()

2474

gnutls.openpgp_crt_init(ctypes.byref(crt))

2052

crt = gnutls.library.types.gnutls_openpgp_crt_t()

2053

gnutls.library.functions.gnutls_openpgp_crt_init(

2054

ctypes.byref(crt))

2475

2055

# Import the OpenPGP public key into the certificate

2476

gnutls.openpgp_crt_import(crt, ctypes.byref(datum),

2477

gnutls.OPENPGP_FMT_RAW)

2056

gnutls.library.functions.gnutls_openpgp_crt_import(

2057

crt, ctypes.byref(datum),

2058

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2478

2059

# Verify the self signature in the key

2479

2060

crtverify = ctypes.c_uint()

2480

gnutls.openpgp_crt_verify_self(crt, 0,

2481

ctypes.byref(crtverify))

2061

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

2062

crt, 0, ctypes.byref(crtverify))

2482

2063

if crtverify.value != 0:

2483

gnutls.openpgp_crt_deinit(crt)

2484

raise gnutls.CertificateSecurityError(code

2485

=crtverify.value)

2064

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2065

raise gnutls.errors.CertificateSecurityError(

2066

"Verify failed")

2486

2067

# New buffer for the fingerprint

2487

2068

buf = ctypes.create_string_buffer(20)

2488

2069

buf_len = ctypes.c_size_t()

2489

2070

# Get the fingerprint from the certificate into the buffer

2490

gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),

2491

ctypes.byref(buf_len))

2071

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

2072

crt, ctypes.byref(buf), ctypes.byref(buf_len))

2492

2073

# Deinit the certificate

2493

gnutls.openpgp_crt_deinit(crt)

2074

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2494

2075

# Convert the buffer to a Python bytestring

2495

2076

fpr = ctypes.string_at(buf, buf_len.value)

2496

2077

# Convert the bytestring to hexadecimal notation

2500

2081

2501

2082

class MultiprocessingMixIn(object):

2502

2083

"""Like socketserver.ThreadingMixIn, but with multiprocessing"""

2503

2084

2504

2085

def sub_process_main(self, request, address):

2505

2086

try:

2506

2087

self.finish_request(request, address)

2507

2088

except Exception:

2508

2089

self.handle_error(request, address)

2509

2090

self.close_request(request)

2510

2091

2511

2092

def process_request(self, request, address):

2512

2093

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

2513

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

2514

args=(request, address))

2094

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

2095

args = (request, address))

2515

2096

proc.start()

2516

2097

return proc

2517

2098

2518

2099

2519

2100

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

2520

2101

""" adds a pipe to the MixIn """

2521

2102

2522

2103

def process_request(self, request, client_address):

2523

2104

"""Overrides and wraps the original process_request().

2524

2105

2525

2106

This function creates a new pipe in self.pipe

2526

2107

"""

2527

2108

parent_pipe, self.child_pipe = multiprocessing.Pipe()

2528

2109

2529

2110

proc = MultiprocessingMixIn.process_request(self, request,

2530

2111

client_address)

2531

2112

self.child_pipe.close()

2532

2113

self.add_pipe(parent_pipe, proc)

2533

2114

2534

2115

def add_pipe(self, parent_pipe, proc):

2535

2116

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

2536

2117

raise NotImplementedError()

2539

2120

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2540

2121

socketserver.TCPServer, object):

2541

2122

"""IPv6-capable TCP server. Accepts 'None' as address and/or port

2542

2123

2543

2124

Attributes:

2544

2125

enabled: Boolean; whether this server is activated yet

2545

2126

interface: None or a network interface name (string)

2546

2127

use_ipv6: Boolean; to use IPv6 or not

2547

2128

"""

2548

2129

2549

2130

def __init__(self, server_address, RequestHandlerClass,

2550

2131

interface=None,

2551

2132

use_ipv6=True,

2561

2142

self.socketfd = socketfd

2562

2143

# Save the original socket.socket() function

2563

2144

self.socket_socket = socket.socket

2564

2565

2145

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

2566

#

2146

#

2567

2147

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

2568

2148

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

2569

2149

# patching socket.socket.)

2570

#

2150

#

2571

2151

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

2572

2152

@functools.wraps(socket.socket)

2573

2153

def socket_wrapper(*args, **kwargs):

2585

2165

# socket_wrapper(), if socketfd was set.

2586

2166

socketserver.TCPServer.__init__(self, server_address,

2587

2167

RequestHandlerClass)

2588

2168

2589

2169

def server_bind(self):

2590

2170

"""This overrides the normal server_bind() function

2591

2171

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

2592

2172

bind to an address or port if they were not specified."""

2593

global SO_BINDTODEVICE

2594

2173

if self.interface is not None:

2595

2174

if SO_BINDTODEVICE is None:

2596

# Fall back to a hard-coded value which seems to be

2597

# common enough.

2598

logger.warning("SO_BINDTODEVICE not found, trying 25")

2599

SO_BINDTODEVICE = 25

2600

try:

2601

self.socket.setsockopt(

2602

socket.SOL_SOCKET, SO_BINDTODEVICE,

2603

(self.interface + "\0").encode("utf-8"))

2604

except socket.error as error:

2605

if error.errno == errno.EPERM:

2606

logger.error("No permission to bind to"

2607

" interface %s", self.interface)

2608

elif error.errno == errno.ENOPROTOOPT:

2609

logger.error("SO_BINDTODEVICE not available;"

2610

" cannot bind to interface %s",

2611

self.interface)

2612

elif error.errno == errno.ENODEV:

2613

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

2614

" cannot bind", self.interface)

2615

else:

2616

raise

2175

logger.error("SO_BINDTODEVICE does not exist;"

2176

" cannot bind to interface %s",

2177

self.interface)

2178

else:

2179

try:

2180

self.socket.setsockopt(

2181

socket.SOL_SOCKET, SO_BINDTODEVICE,

2182

(self.interface + "\0").encode("utf-8"))

2183

except socket.error as error:

2184

if error.errno == errno.EPERM:

2185

logger.error("No permission to bind to"

2186

" interface %s", self.interface)

2187

elif error.errno == errno.ENOPROTOOPT:

2188

logger.error("SO_BINDTODEVICE not available;"

2189

" cannot bind to interface %s",

2190

self.interface)

2191

elif error.errno == errno.ENODEV:

2192

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

2193

" cannot bind", self.interface)

2194

else:

2195

raise

2617

2196

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

2618

2197

if self.server_address[0] or self.server_address[1]:

2619

2198

if not self.server_address[0]:

2620

2199

if self.address_family == socket.AF_INET6:

2621

any_address = "::" # in6addr_any

2200

any_address = "::" # in6addr_any

2622

2201

else:

2623

any_address = "0.0.0.0" # INADDR_ANY

2202

any_address = "0.0.0.0" # INADDR_ANY

2624

2203

self.server_address = (any_address,

2625

2204

self.server_address[1])

2626

2205

elif not self.server_address[1]:

2636

2215

2637

2216

class MandosServer(IPv6_TCPServer):

2638

2217

"""Mandos server.

2639

2218

2640

2219

Attributes:

2641

2220

clients: set of Client objects

2642

2221

gnutls_priority GnuTLS priority string

2643

2222

use_dbus: Boolean; to emit D-Bus signals or not

2644

2645

Assumes a GLib.MainLoop event loop.

2223

2224

Assumes a gobject.MainLoop event loop.

2646

2225

"""

2647

2226

2648

2227

def __init__(self, server_address, RequestHandlerClass,

2649

2228

interface=None,

2650

2229

use_ipv6=True,

2660

2239

self.gnutls_priority = gnutls_priority

2661

2240

IPv6_TCPServer.__init__(self, server_address,

2662

2241

RequestHandlerClass,

2663

interface=interface,

2664

use_ipv6=use_ipv6,

2665

socketfd=socketfd)

2666

2242

interface = interface,

2243

use_ipv6 = use_ipv6,

2244

socketfd = socketfd)

2245

2667

2246

def server_activate(self):

2668

2247

if self.enabled:

2669

2248

return socketserver.TCPServer.server_activate(self)

2670

2249

2671

2250

def enable(self):

2672

2251

self.enabled = True

2673

2252

2674

2253

def add_pipe(self, parent_pipe, proc):

2675

2254

# Call "handle_ipc" for both data and EOF events

2676

GLib.io_add_watch(

2255

gobject.io_add_watch(

2677

2256

parent_pipe.fileno(),

2678

GLib.IO_IN | GLib.IO_HUP,

2257

gobject.IO_IN | gobject.IO_HUP,

2679

2258

functools.partial(self.handle_ipc,

2680

parent_pipe=parent_pipe,

2681

proc=proc))

2682

2259

parent_pipe = parent_pipe,

2260

proc = proc))

2261

2683

2262

def handle_ipc(self, source, condition,

2684

2263

parent_pipe=None,

2685

proc=None,

2264

proc = None,

2686

2265

client_object=None):

2687

2266

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

2688

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

2267

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

2689

2268

# Wait for other process to exit

2690

2269

proc.join()

2691

2270

return False

2692

2271

2693

2272

# Read a request from the child

2694

2273

request = parent_pipe.recv()

2695

2274

command = request[0]

2696

2275

2697

2276

if command == 'init':

2698

key_id = request[1].decode("ascii")

2699

fpr = request[2].decode("ascii")

2700

address = request[3]

2701

2702

for c in self.clients.values():

2703

if key_id == "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855":

2704

continue

2705

if key_id and c.key_id == key_id:

2706

client = c

2707

break

2708

if fpr and c.fingerprint == fpr:

2277

fpr = request[1]

2278

address = request[2]

2279

2280

for c in self.clients.itervalues():

2281

if c.fingerprint == fpr:

2709

2282

client = c

2710

2283

break

2711

2284

else:

2712

logger.info("Client not found for key ID: %s, address"

2713

": %s", key_id or fpr, address)

2285

logger.info("Client not found for fingerprint: %s, ad"

2286

"dress: %s", fpr, address)

2714

2287

if self.use_dbus:

2715

2288

# Emit D-Bus signal

2716

mandos_dbus_service.ClientNotFound(key_id or fpr,

2289

mandos_dbus_service.ClientNotFound(fpr,

2717

2290

address[0])

2718

2291

parent_pipe.send(False)

2719

2292

return False

2720

2721

GLib.io_add_watch(

2293

2294

gobject.io_add_watch(

2722

2295

parent_pipe.fileno(),

2723

GLib.IO_IN | GLib.IO_HUP,

2296

gobject.IO_IN | gobject.IO_HUP,

2724

2297

functools.partial(self.handle_ipc,

2725

parent_pipe=parent_pipe,

2726

proc=proc,

2727

client_object=client))

2298

parent_pipe = parent_pipe,

2299

proc = proc,

2300

client_object = client))

2728

2301

parent_pipe.send(True)

2729

2302

# remove the old hook in favor of the new above hook on

2730

2303

# same fileno

2733

2306

funcname = request[1]

2734

2307

args = request[2]

2735

2308

kwargs = request[3]

2736

2309

2737

2310

parent_pipe.send(('data', getattr(client_object,

2738

2311

funcname)(*args,

2739

2312

**kwargs)))

2740

2313

2741

2314

if command == 'getattr':

2742

2315

attrname = request[1]

2743

2316

if isinstance(client_object.__getattribute__(attrname),

2746

2319

else:

2747

2320

parent_pipe.send((

2748

2321

'data', client_object.__getattribute__(attrname)))

2749

2322

2750

2323

if command == 'setattr':

2751

2324

attrname = request[1]

2752

2325

value = request[2]

2753

2326

setattr(client_object, attrname, value)

2754

2327

2755

2328

return True

2756

2329

2757

2330

2758

2331

def rfc3339_duration_to_delta(duration):

2759

2332

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

2760

2333

2761

2334

>>> rfc3339_duration_to_delta("P7D")

2762

2335

datetime.timedelta(7)

2763

2336

>>> rfc3339_duration_to_delta("PT60S")

2773

2346

>>> rfc3339_duration_to_delta("P1DT3M20S")

2774

2347

datetime.timedelta(1, 200)

2775

2348

"""

2776

2349

2777

2350

# Parsing an RFC 3339 duration with regular expressions is not

2778

2351

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

2779

2352

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

2780

2353

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

2781

2354

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

2782

2355

# avoid excessive use of external libraries.

2783

2356

2784

2357

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

2785

2358

Token = collections.namedtuple("Token", (

2786

2359

"regexp", # To match token; if "value" is not None, must have

2819

2392

frozenset((token_year, token_month,

2820

2393

token_day, token_time,

2821

2394

token_week)))

2822

# Define starting values:

2823

# Value so far

2824

value = datetime.timedelta()

2395

# Define starting values

2396

value = datetime.timedelta() # Value so far

2825

2397

found_token = None

2826

# Following valid tokens

2827

followers = frozenset((token_duration, ))

2828

# String left to parse

2829

s = duration

2398

followers = frozenset((token_duration, )) # Following valid tokens

2399

s = duration # String left to parse

2830

2400

# Loop until end token is found

2831

2401

while found_token is not token_end:

2832

2402

# Search for any currently valid tokens

2856

2426

2857

2427

def string_to_delta(interval):

2858

2428

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

2859

2429

2860

2430

>>> string_to_delta('7d')

2861

2431

datetime.timedelta(7)

2862

2432

>>> string_to_delta('60s')

2870

2440

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

2871

2441

datetime.timedelta(0, 330)

2872

2442

"""

2873

2443

2874

2444

try:

2875

2445

return rfc3339_duration_to_delta(interval)

2876

2446

except ValueError:

2877

2447

pass

2878

2448

2879

2449

timevalue = datetime.timedelta(0)

2880

2450

for s in interval.split():

2881

2451

try:

2899

2469

return timevalue

2900

2470

2901

2471

2902

def daemon(nochdir=False, noclose=False):

2472

def daemon(nochdir = False, noclose = False):

2903

2473

"""See daemon(3). Standard BSD Unix function.

2904

2474

2905

2475

This should really exist as os.daemon, but it doesn't (yet)."""

2906

2476

if os.fork():

2907

2477

sys.exit()

2925

2495

2926

2496

2927

2497

def main():

2928

2498

2929

2499

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

2930

2500

# Parsing of options, both command line and config file

2931

2501

2932

2502

parser = argparse.ArgumentParser()

2933

2503

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

2934

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

2504

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

2935

2505

help="show version number and exit")

2936

2506

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

2937

2507

help="Bind to interface IF")

2973

2543

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

2974

2544

dest="zeroconf", help="Do not use Zeroconf",

2975

2545

default=None)

2976

2546

2977

2547

options = parser.parse_args()

2978

2548

2979

2549

if options.check:

2980

2550

import doctest

2981

2551

fail_count, test_count = doctest.testmod()

2982

2552

sys.exit(os.EX_OK if fail_count == 0 else 1)

2983

2553

2984

2554

# Default values for config file for server-global settings

2985

if gnutls.has_rawpk:

2986

priority = ("SECURE128:!CTYPE-X.509:+CTYPE-RAWPK:!RSA"

2987

":!VERS-ALL:+VERS-TLS1.3:%PROFILE_ULTRA")

2988

else:

2989

priority = ("SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"

2990

":+SIGN-DSA-SHA256")

2991

server_defaults = {"interface": "",

2992

"address": "",

2993

"port": "",

2994

"debug": "False",

2995

"priority": priority,

2996

"servicename": "Mandos",

2997

"use_dbus": "True",

2998

"use_ipv6": "True",

2999

"debuglevel": "",

3000

"restore": "True",

3001

"socket": "",

3002

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

3003

"foreground": "False",

3004

"zeroconf": "True",

3005

}

3006

del priority

3007

2555

server_defaults = { "interface": "",

2556

"address": "",

2557

"port": "",

2558

"debug": "False",

2559

"priority":

2560

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

2561

":+SIGN-DSA-SHA256",

2562

"servicename": "Mandos",

2563

"use_dbus": "True",

2564

"use_ipv6": "True",

2565

"debuglevel": "",

2566

"restore": "True",

2567

"socket": "",

2568

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

2569

"foreground": "False",

2570

"zeroconf": "True",

2571

}

2572

3008

2573

# Parse config file for server-global settings

3009

2574

server_config = configparser.SafeConfigParser(server_defaults)

3010

2575

del server_defaults

3012

2577

# Convert the SafeConfigParser object to a dict

3013

2578

server_settings = server_config.defaults()

3014

2579

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

3015

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

3016

"foreground", "zeroconf"):

2580

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

3017

2581

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

3018

2582

option)

3019

2583

if server_settings["port"]:

3029

2593

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

3030

2594

["socket"])

3031

2595

del server_config

3032

2596

3033

2597

# Override the settings from the config file with command line

3034

2598

# options, if set.

3035

2599

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

3053

2617

if server_settings["debug"]:

3054

2618

server_settings["foreground"] = True

3055

2619

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

3056

2620

3057

2621

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

3058

2622

3059

2623

if (not server_settings["zeroconf"]

3060

2624

and not (server_settings["port"]

3061

2625

or server_settings["socket"] != "")):

3062

2626

parser.error("Needs port or socket to work without Zeroconf")

3063

2627

3064

2628

# For convenience

3065

2629

debug = server_settings["debug"]

3066

2630

debuglevel = server_settings["debuglevel"]

3070

2634

stored_state_file)

3071

2635

foreground = server_settings["foreground"]

3072

2636

zeroconf = server_settings["zeroconf"]

3073

2637

3074

2638

if debug:

3075

2639

initlogger(debug, logging.DEBUG)

3076

2640

else:

3079

2643

else:

3080

2644

level = getattr(logging, debuglevel.upper())

3081

2645

initlogger(debug, level)

3082

2646

3083

2647

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

3084

2648

syslogger.setFormatter(

3085

2649

logging.Formatter('Mandos ({}) [%(process)d]:'

3086

2650

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

3087

2651

server_settings["servicename"])))

3088

2652

3089

2653

# Parse config file with clients

3090

2654

client_config = configparser.SafeConfigParser(Client

3091

2655

.client_defaults)

3092

2656

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

3093

2657

"clients.conf"))

3094

2658

3095

2659

global mandos_dbus_service

3096

2660

mandos_dbus_service = None

3097

2661

3098

2662

socketfd = None

3099

2663

if server_settings["socket"] != "":

3100

2664

socketfd = server_settings["socket"]

3116

2680

except IOError as e:

3117

2681

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

3118

2682

exc_info=e)

3119

3120

for name, group in (("_mandos", "_mandos"),

3121

("mandos", "mandos"),

3122

("nobody", "nogroup")):

2683

2684

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

3123

2685

try:

3124

2686

uid = pwd.getpwnam(name).pw_uid

3125

gid = pwd.getpwnam(group).pw_gid

2687

gid = pwd.getpwnam(name).pw_gid

3126

2688

break

3127

2689

except KeyError:

3128

2690

continue

3132

2694

try:

3133

2695

os.setgid(gid)

3134

2696

os.setuid(uid)

3135

if debug:

3136

logger.debug("Did setuid/setgid to {}:{}".format(uid,

3137

gid))

3138

2697

except OSError as error:

3139

logger.warning("Failed to setuid/setgid to {}:{}: {}"

3140

.format(uid, gid, os.strerror(error.errno)))

3141

2698

if error.errno != errno.EPERM:

3142

2699

raise

3143

2700

3144

2701

if debug:

3145

2702

# Enable all possible GnuTLS debugging

3146

2703

3147

2704

# "Use a log level over 10 to enable all debugging options."

3148

2705

# - GnuTLS manual

3149

gnutls.global_set_log_level(11)

3150

3151

@gnutls.log_func

2706

gnutls.library.functions.gnutls_global_set_log_level(11)

2707

2708

@gnutls.library.types.gnutls_log_func

3152

2709

def debug_gnutls(level, string):

3153

2710

logger.debug("GnuTLS: %s", string[:-1])

3154

3155

gnutls.global_set_log_function(debug_gnutls)

3156

2711

2712

gnutls.library.functions.gnutls_global_set_log_function(

2713

debug_gnutls)

2714

3157

2715

# Redirect stdin so all checkers get /dev/null

3158

2716

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

3159

2717

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

3160

2718

if null > 2:

3161

2719

os.close(null)

3162

2720

3163

2721

# Need to fork before connecting to D-Bus

3164

2722

if not foreground:

3165

2723

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

3166

2724

daemon()

3167

3168

# multiprocessing will use threads, so before we use GLib we need

3169

# to inform GLib that threads will be used.

3170

GLib.threads_init()

3171

2725

2726

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

2727

# need to inform gobject that threads will be used.

2728

gobject.threads_init()

2729

3172

2730

global main_loop

3173

2731

# From the Avahi example code

3174

2732

DBusGMainLoop(set_as_default=True)

3175

main_loop = GLib.MainLoop()

2733

main_loop = gobject.MainLoop()

3176

2734

bus = dbus.SystemBus()

3177

2735

# End of Avahi example code

3178

2736

if use_dbus:

3191

2749

if zeroconf:

3192

2750

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

3193

2751

service = AvahiServiceToSyslog(

3194

name=server_settings["servicename"],

3195

servicetype="_mandos._tcp",

3196

protocol=protocol,

3197

bus=bus)

2752

name = server_settings["servicename"],

2753

servicetype = "_mandos._tcp",

2754

protocol = protocol,

2755

bus = bus)

3198

2756

if server_settings["interface"]:

3199

2757

service.interface = if_nametoindex(

3200

2758

server_settings["interface"].encode("utf-8"))

3201

2759

3202

2760

global multiprocessing_manager

3203

2761

multiprocessing_manager = multiprocessing.Manager()

3204

2762

3205

2763

client_class = Client

3206

2764

if use_dbus:

3207

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

3208

2765

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

2766

3209

2767

client_settings = Client.config_parser(client_config)

3210

2768

old_client_settings = {}

3211

2769

clients_data = {}

3212

2770

3213

2771

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

3214

2772

global wnull

3215

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

2773

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

3216

2774

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

3217

2775

# mode

3218

2776

if debug or not foreground:

3219

2777

wnull.close()

3220

2778

3221

2779

# Get client data and settings from last running state.

3222

2780

if server_settings["restore"]:

3223

2781

try:

3224

2782

with open(stored_state_path, "rb") as stored_state:

3225

if sys.version_info.major == 2:

3226

clients_data, old_client_settings = pickle.load(

3227

stored_state)

3228

else:

3229

bytes_clients_data, bytes_old_client_settings = (

3230

pickle.load(stored_state, encoding="bytes"))

3231

# Fix bytes to strings

3232

# clients_data

3233

# .keys()

3234

clients_data = {(key.decode("utf-8")

3235

if isinstance(key, bytes)

3236

else key): value

3237

for key, value in

3238

bytes_clients_data.items()}

3239

del bytes_clients_data

3240

for key in clients_data:

3241

value = {(k.decode("utf-8")

3242

if isinstance(k, bytes) else k): v

3243

for k, v in

3244

clients_data[key].items()}

3245

clients_data[key] = value

3246

# .client_structure

3247

value["client_structure"] = [

3248

(s.decode("utf-8")

3249

if isinstance(s, bytes)

3250

else s) for s in

3251

value["client_structure"]]

3252

# .name & .host

3253

for k in ("name", "host"):

3254

if isinstance(value[k], bytes):

3255

value[k] = value[k].decode("utf-8")

3256

if not value.has_key("key_id"):

3257

value["key_id"] = ""

3258

elif not value.has_key("fingerprint"):

3259

value["fingerprint"] = ""

3260

# old_client_settings

3261

# .keys()

3262

old_client_settings = {

3263

(key.decode("utf-8")

3264

if isinstance(key, bytes)

3265

else key): value

3266

for key, value in

3267

bytes_old_client_settings.items()}

3268

del bytes_old_client_settings

3269

# .host

3270

for value in old_client_settings.values():

3271

if isinstance(value["host"], bytes):

3272

value["host"] = (value["host"]

3273

.decode("utf-8"))

2783

clients_data, old_client_settings = pickle.load(

2784

stored_state)

3274

2785

os.remove(stored_state_path)

3275

2786

except IOError as e:

3276

2787

if e.errno == errno.ENOENT:

3284

2795

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

3285

2796

"EOFError:",

3286

2797

exc_info=e)

3287

2798

3288

2799

with PGPEngine() as pgp:

3289

2800

for client_name, client in clients_data.items():

3290

2801

# Skip removed clients

3291

2802

if client_name not in client_settings:

3292

2803

continue

3293

2804

3294

2805

# Decide which value to use after restoring saved state.

3295

2806

# We have three different values: Old config file,

3296

2807

# new config file, and saved state.

3307

2818

client[name] = value

3308

2819

except KeyError:

3309

2820

pass

3310

2821

3311

2822

# Clients who has passed its expire date can still be

3312

2823

# enabled if its last checker was successful. A Client

3313

2824

# whose checker succeeded before we stored its state is

3346

2857

client_name))

3347

2858

client["secret"] = (client_settings[client_name]

3348

2859

["secret"])

3349

2860

3350

2861

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

3351

2862

for client_name in (set(old_client_settings)

3352

2863

- set(client_settings)):

3354

2865

for client_name in (set(client_settings)

3355

2866

- set(old_client_settings)):

3356

2867

clients_data[client_name] = client_settings[client_name]

3357

2868

3358

2869

# Create all client objects

3359

2870

for client_name, client in clients_data.items():

3360

2871

tcp_server.clients[client_name] = client_class(

3361

name=client_name,

3362

settings=client,

3363

server_settings=server_settings)

3364

2872

name = client_name,

2873

settings = client,

2874

server_settings = server_settings)

2875

3365

2876

if not tcp_server.clients:

3366

2877

logger.warning("No clients defined")

3367

2878

3368

2879

if not foreground:

3369

2880

if pidfile is not None:

3370

2881

pid = os.getpid()

3376

2887

pidfilename, pid)

3377

2888

del pidfile

3378

2889

del pidfilename

3379

3380

for termsig in (signal.SIGHUP, signal.SIGTERM):

3381

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3382

lambda: main_loop.quit() and False)

3383

2890

2891

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

2892

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

2893

3384

2894

if use_dbus:

3385

2895

3386

2896

@alternate_dbus_interfaces(

3387

{"se.recompile.Mandos": "se.bsnet.fukt.Mandos"})

2897

{ "se.recompile.Mandos": "se.bsnet.fukt.Mandos" })

3388

2898

class MandosDBusService(DBusObjectWithObjectManager):

3389

2899

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

3390

2900

3391

2901

def __init__(self):

3392

2902

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

3393

2903

3394

2904

_interface = "se.recompile.Mandos"

3395

2905

3396

2906

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

3397

2907

def ClientAdded(self, objpath):

3398

2908

"D-Bus signal"

3399

2909

pass

3400

2910

3401

2911

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

3402

def ClientNotFound(self, key_id, address):

2912

def ClientNotFound(self, fingerprint, address):

3403

2913

"D-Bus signal"

3404

2914

pass

3405

2915

3406

2916

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

3407

2917

"true"})

3408

2918

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

3409

2919

def ClientRemoved(self, objpath, name):

3410

2920

"D-Bus signal"

3411

2921

pass

3412

2922

3413

2923

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

3414

2924

"true"})

3415

2925

@dbus.service.method(_interface, out_signature="ao")

3416

2926

def GetAllClients(self):

3417

2927

"D-Bus method"

3418

2928

return dbus.Array(c.dbus_object_path for c in

3419

tcp_server.clients.values())

3420

2929

tcp_server.clients.itervalues())

2930

3421

2931

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

3422

2932

"true"})

3423

2933

@dbus.service.method(_interface,

3425

2935

def GetAllClientsWithProperties(self):

3426

2936

"D-Bus method"

3427

2937

return dbus.Dictionary(

3428

{c.dbus_object_path: c.GetAll(

2938

{ c.dbus_object_path: c.GetAll(

3429

2939

"se.recompile.Mandos.Client")

3430

for c in tcp_server.clients.values()},

2940

for c in tcp_server.clients.itervalues() },

3431

2941

signature="oa{sv}")

3432

2942

3433

2943

@dbus.service.method(_interface, in_signature="o")

3434

2944

def RemoveClient(self, object_path):

3435

2945

"D-Bus method"

3436

for c in tcp_server.clients.values():

2946

for c in tcp_server.clients.itervalues():

3437

2947

if c.dbus_object_path == object_path:

3438

2948

del tcp_server.clients[c.name]

3439

2949

c.remove_from_connection()

3443

2953

self.client_removed_signal(c)

3444

2954

return

3445

2955

raise KeyError(object_path)

3446

2956

3447

2957

del _interface

3448

2958

3449

2959

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3450

out_signature="a{oa{sa{sv}}}")

2960

out_signature = "a{oa{sa{sv}}}")

3451

2961

def GetManagedObjects(self):

3452

2962

"""D-Bus method"""

3453

2963

return dbus.Dictionary(

3454

{client.dbus_object_path:

3455

dbus.Dictionary(

3456

{interface: client.GetAll(interface)

3457

for interface in

3458

client._get_all_interface_names()})

3459

for client in tcp_server.clients.values()})

3460

2964

{ client.dbus_object_path:

2965

dbus.Dictionary(

2966

{ interface: client.GetAll(interface)

2967

for interface in

2968

client._get_all_interface_names()})

2969

for client in tcp_server.clients.values()})

2970

3461

2971

def client_added_signal(self, client):

3462

2972

"""Send the new standard signal and the old signal"""

3463

2973

if use_dbus:

3465

2975

self.InterfacesAdded(

3466

2976

client.dbus_object_path,

3467

2977

dbus.Dictionary(

3468

{interface: client.GetAll(interface)

3469

for interface in

3470

client._get_all_interface_names()}))

2978

{ interface: client.GetAll(interface)

2979

for interface in

2980

client._get_all_interface_names()}))

3471

2981

# Old signal

3472

2982

self.ClientAdded(client.dbus_object_path)

3473

2983

3474

2984

def client_removed_signal(self, client):

3475

2985

"""Send the new standard signal and the old signal"""

3476

2986

if use_dbus:

3481

2991

# Old signal

3482

2992

self.ClientRemoved(client.dbus_object_path,

3483

2993

client.name)

3484

2994

3485

2995

mandos_dbus_service = MandosDBusService()

3486

3487

# Save modules to variables to exempt the modules from being

3488

# unloaded before the function registered with atexit() is run.

3489

mp = multiprocessing

3490

wn = wnull

3491

2996

3492

2997

def cleanup():

3493

2998

"Cleanup function; run on exit"

3494

2999

if zeroconf:

3495

3000

service.cleanup()

3496

3497

mp.active_children()

3498

wn.close()

3001

3002

multiprocessing.active_children()

3003

wnull.close()

3499

3004

if not (tcp_server.clients or client_settings):

3500

3005

return

3501

3006

3502

3007

# Store client before exiting. Secrets are encrypted with key

3503

3008

# based on what config file has. If config file is

3504

3009

# removed/edited, old secret will thus be unrecovable.

3505

3010

clients = {}

3506

3011

with PGPEngine() as pgp:

3507

for client in tcp_server.clients.values():

3012

for client in tcp_server.clients.itervalues():

3508

3013

key = client_settings[client.name]["secret"]

3509

3014

client.encrypted_secret = pgp.encrypt(client.secret,

3510

3015

key)

3511

3016

client_dict = {}

3512

3017

3513

3018

# A list of attributes that can not be pickled

3514

3019

# + secret.

3515

exclude = {"bus", "changedstate", "secret",

3516

"checker", "server_settings"}

3020

exclude = { "bus", "changedstate", "secret",

3021

"checker", "server_settings" }

3517

3022

for name, typ in inspect.getmembers(dbus.service

3518

3023

.Object):

3519

3024

exclude.add(name)

3520

3025

3521

3026

client_dict["encrypted_secret"] = (client

3522

3027

.encrypted_secret)

3523

3028

for attr in client.client_structure:

3524

3029

if attr not in exclude:

3525

3030

client_dict[attr] = getattr(client, attr)

3526

3031

3527

3032

clients[client.name] = client_dict

3528

3033

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

3529

3034

3530

3035

try:

3531

3036

with tempfile.NamedTemporaryFile(

3532

3037

mode='wb',

3534

3039

prefix='clients-',

3535

3040

dir=os.path.dirname(stored_state_path),

3536

3041

delete=False) as stored_state:

3537

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

3538

protocol=2)

3042

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

3539

3043

tempname = stored_state.name

3540

3044

os.rename(tempname, stored_state_path)

3541

3045

except (IOError, OSError) as e:

3551

3055

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

3552

3056

exc_info=e)

3553

3057

raise

3554

3058

3555

3059

# Delete all clients, and settings from config

3556

3060

while tcp_server.clients:

3557

3061

name, client = tcp_server.clients.popitem()

3560

3064

# Don't signal the disabling

3561

3065

client.disable(quiet=True)

3562

3066

# Emit D-Bus signal for removal

3563

if use_dbus:

3564

mandos_dbus_service.client_removed_signal(client)

3067

mandos_dbus_service.client_removed_signal(client)

3565

3068

client_settings.clear()

3566

3069

3567

3070

atexit.register(cleanup)

3568

3569

for client in tcp_server.clients.values():

3071

3072

for client in tcp_server.clients.itervalues():

3570

3073

if use_dbus:

3571

3074

# Emit D-Bus signal for adding

3572

3075

mandos_dbus_service.client_added_signal(client)

3573

3076

# Need to initiate checking of clients

3574

3077

if client.enabled:

3575

3078

client.init_checker()

3576

3079

3577

3080

tcp_server.enable()

3578

3081

tcp_server.server_activate()

3579

3082

3580

3083

# Find out what port we got

3581

3084

if zeroconf:

3582

3085

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

3587

3090

else: # IPv4

3588

3091

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

3589

3092

*tcp_server.socket.getsockname())

3590

3591

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

3592

3093

3094

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

3095

3593

3096

try:

3594

3097

if zeroconf:

3595

3098

# From the Avahi example code

3600

3103

cleanup()

3601

3104

sys.exit(1)

3602

3105

# End of Avahi example code

3603

3604

GLib.io_add_watch(tcp_server.fileno(), GLib.IO_IN,

3605

lambda *args, **kwargs:

3606

(tcp_server.handle_request

3607

(*args[2:], **kwargs) or True))

3608

3106

3107

gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,

3108

lambda *args, **kwargs:

3109

(tcp_server.handle_request

3110

(*args[2:], **kwargs) or True))

3111

3609

3112

logger.debug("Starting main loop")

3610

3113

main_loop.run()

3611

3114

except AvahiError as error: