/mandos/trunk : revision 800

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

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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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.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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if sys.version_info.major == 2:

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str = unicode

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version = "1.7.7"

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version = "1.7.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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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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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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'--no-use-agent']

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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]

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+ self.gnupgargs,

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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, '--decrypt',

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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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"

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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")

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ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

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ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

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ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

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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

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SERVER_FAILURE = 4 # avahi-common/defs.h

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avahi = Avahi()

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class AvahiError(Exception):

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

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.format(self.name)))

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return ret

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# Pretend that we have a GnuTLS module

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class GnuTLS(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 a GnuTLS module."""

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_library = ctypes.cdll.LoadLibrary(

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ctypes.util.find_library("gnutls"))

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_need_version = b"3.3.0"

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def __init__(self):

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# Need to use class name "GnuTLS" here, since this method is

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# called before the assignment to the "gnutls" global variable

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# happens.

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

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

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.format(self._need_version))

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# Unless otherwise indicated, the constants and types below are

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

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# Constants

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E_SUCCESS = 0

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E_INTERRUPTED = -52

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E_AGAIN = -28

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CRT_OPENPGP = 2

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CLIENT = 2

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SHUT_RDWR = 0

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CRD_CERTIFICATE = 1

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E_NO_CERTIFICATE_FOUND = -49

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OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

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# Types

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class session_int(ctypes.Structure):

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_fields_ = []

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session_t = ctypes.POINTER(session_int)

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class certificate_credentials_st(ctypes.Structure):

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_fields_ = []

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certificate_credentials_t = ctypes.POINTER(

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certificate_credentials_st)

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certificate_type_t = ctypes.c_int

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class datum_t(ctypes.Structure):

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

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('size', ctypes.c_uint)]

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class openpgp_crt_int(ctypes.Structure):

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_fields_ = []

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openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

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openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

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

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credentials_type_t = ctypes.c_int

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transport_ptr_t = ctypes.c_void_p

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close_request_t = ctypes.c_int

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# Exceptions

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class Error(Exception):

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

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# exception might be raised from within GnuTLS.__init__,

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

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# global variable has happened.

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

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

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# code is passed, convert it to a string with

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# gnutls.strerror()

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self.code = code

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if message is None and code is not None:

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message = GnuTLS.strerror(code)

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

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message, *args)

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class CertificateSecurityError(Error):

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pass

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# Classes

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class Credentials(object):

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def __init__(self):

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self._c_object = gnutls.certificate_credentials_t()

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gnutls.certificate_allocate_credentials(

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ctypes.byref(self._c_object))

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self.type = gnutls.CRD_CERTIFICATE

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def __del__(self):

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gnutls.certificate_free_credentials(self._c_object)

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class ClientSession(object):

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

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self._c_object = gnutls.session_t()

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

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gnutls.set_default_priority(self._c_object)

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

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gnutls.handshake_set_private_extensions(self._c_object,

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True)

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self.socket = socket

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if credentials is None:

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credentials = gnutls.Credentials()

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

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ctypes.cast(credentials._c_object,

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ctypes.c_void_p))

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self.credentials = credentials

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def __del__(self):

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gnutls.deinit(self._c_object)

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582

def handshake(self):

583

return gnutls.handshake(self._c_object)

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def send(self, data):

586

data = bytes(data)

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data_len = len(data)

588

while data_len > 0:

589

data_len -= gnutls.record_send(self._c_object,

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data[-data_len:],

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data_len)

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def bye(self):

594

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

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# Error handling functions

597

def _error_code(result):

598

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

599

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

600

if result >= 0:

601

return result

602

if result == gnutls.E_NO_CERTIFICATE_FOUND:

603

raise gnutls.CertificateSecurityError(code = result)

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raise gnutls.Error(code = result)

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606

def _retry_on_error(result, func, arguments):

607

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

608

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

609

while result < 0:

610

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

611

return _error_code(result)

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result = func(*arguments)

613

return result

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# Unless otherwise indicated, the function declarations below are

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

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618

# Functions

619

priority_set_direct = _library.gnutls_priority_set_direct

620

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

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ctypes.POINTER(ctypes.c_char_p)]

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priority_set_direct.restype = _error_code

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init = _library.gnutls_init

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

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init.restype = _error_code

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628

set_default_priority = _library.gnutls_set_default_priority

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set_default_priority.argtypes = [session_t]

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set_default_priority.restype = _error_code

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record_send = _library.gnutls_record_send

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record_send.argtypes = [session_t, ctypes.c_void_p,

634

ctypes.c_size_t]

635

record_send.restype = ctypes.c_ssize_t

636

record_send.errcheck = _retry_on_error

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638

certificate_allocate_credentials = (

639

_library.gnutls_certificate_allocate_credentials)

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certificate_allocate_credentials.argtypes = [

641

ctypes.POINTER(certificate_credentials_t)]

642

certificate_allocate_credentials.restype = _error_code

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644

certificate_free_credentials = (

645

_library.gnutls_certificate_free_credentials)

646

certificate_free_credentials.argtypes = [certificate_credentials_t]

647

certificate_free_credentials.restype = None

648

649

handshake_set_private_extensions = (

650

_library.gnutls_handshake_set_private_extensions)

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handshake_set_private_extensions.argtypes = [session_t,

652

ctypes.c_int]

653

handshake_set_private_extensions.restype = None

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655

credentials_set = _library.gnutls_credentials_set

656

credentials_set.argtypes = [session_t, credentials_type_t,

657

ctypes.c_void_p]

658

credentials_set.restype = _error_code

659

660

strerror = _library.gnutls_strerror

661

strerror.argtypes = [ctypes.c_int]

662

strerror.restype = ctypes.c_char_p

663

664

certificate_type_get = _library.gnutls_certificate_type_get

665

certificate_type_get.argtypes = [session_t]

666

certificate_type_get.restype = _error_code

667

668

certificate_get_peers = _library.gnutls_certificate_get_peers

669

certificate_get_peers.argtypes = [session_t,

670

ctypes.POINTER(ctypes.c_uint)]

671

certificate_get_peers.restype = ctypes.POINTER(datum_t)

672

673

global_set_log_level = _library.gnutls_global_set_log_level

674

global_set_log_level.argtypes = [ctypes.c_int]

675

global_set_log_level.restype = None

676

677

global_set_log_function = _library.gnutls_global_set_log_function

678

global_set_log_function.argtypes = [log_func]

679

global_set_log_function.restype = None

680

681

deinit = _library.gnutls_deinit

682

deinit.argtypes = [session_t]

683

deinit.restype = None

684

685

handshake = _library.gnutls_handshake

686

handshake.argtypes = [session_t]

687

handshake.restype = _error_code

688

handshake.errcheck = _retry_on_error

689

690

transport_set_ptr = _library.gnutls_transport_set_ptr

691

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

692

transport_set_ptr.restype = None

693

694

bye = _library.gnutls_bye

695

bye.argtypes = [session_t, close_request_t]

696

bye.restype = _error_code

697

bye.errcheck = _retry_on_error

698

699

check_version = _library.gnutls_check_version

700

check_version.argtypes = [ctypes.c_char_p]

701

check_version.restype = ctypes.c_char_p

702

703

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

704

705

openpgp_crt_init = _library.gnutls_openpgp_crt_init

706

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

707

openpgp_crt_init.restype = _error_code

708

709

openpgp_crt_import = _library.gnutls_openpgp_crt_import

710

openpgp_crt_import.argtypes = [openpgp_crt_t,

711

ctypes.POINTER(datum_t),

712

openpgp_crt_fmt_t]

713

openpgp_crt_import.restype = _error_code

714

715

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

716

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

717

ctypes.POINTER(ctypes.c_uint)]

718

openpgp_crt_verify_self.restype = _error_code

719

720

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

721

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

722

openpgp_crt_deinit.restype = None

723

724

openpgp_crt_get_fingerprint = (

725

_library.gnutls_openpgp_crt_get_fingerprint)

726

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

727

ctypes.c_void_p,

728

ctypes.POINTER(

729

ctypes.c_size_t)]

730

openpgp_crt_get_fingerprint.restype = _error_code

731

732

# Remove non-public functions

733

del _error_code, _retry_on_error

734

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

735

gnutls = GnuTLS()

736

737

437

def call_pipe(connection, # : multiprocessing.Connection

738

438

func, *args, **kwargs):

739

439

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

754

454

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

755

455

to see if the client lives.

756

456

'None' if no process is running.

757

checker_callback_tag: a GLib event source tag, or None

457

checker_callback_tag: a gobject event source tag, or None

758

458

checker_command: string; External command which is run to check

759

459

if client lives. %() expansions are done at

760

460

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

761

461

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

762

checker_initiator_tag: a GLib event source tag, or None

462

checker_initiator_tag: a gobject event source tag, or None

763

463

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

764

464

client_structure: Object describing what attributes a client has

765

465

and is used for storing the client at exit

766

466

current_checker_command: string; current running checker_command

767

disable_initiator_tag: a GLib event source tag, or None

467

disable_initiator_tag: a gobject event source tag, or None

768

468

enabled: bool()

769

469

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

770

470

uniquely identify the client

833

533

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

834

534

.replace(" ", ""))

835

535

if "secret" in section:

836

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

837

.encode("utf-8"),

838

"base64")

536

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

839

537

elif "secfile" in section:

840

538

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

841

539

(section["secfile"])),

894

592

self.changedstate = multiprocessing_manager.Condition(

895

593

multiprocessing_manager.Lock())

896

594

self.client_structure = [attr

897

for attr in self.__dict__.keys()

595

for attr in self.__dict__.iterkeys()

898

596

if not attr.startswith("_")]

899

597

self.client_structure.append("client_structure")

900

598

926

624

if not quiet:

927

625

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

928

626

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

929

GLib.source_remove(self.disable_initiator_tag)

627

gobject.source_remove(self.disable_initiator_tag)

930

628

self.disable_initiator_tag = None

931

629

self.expires = None

932

630

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

933

GLib.source_remove(self.checker_initiator_tag)

631

gobject.source_remove(self.checker_initiator_tag)

934

632

self.checker_initiator_tag = None

935

633

self.stop_checker()

936

634

self.enabled = False

937

635

if not quiet:

938

636

self.send_changedstate()

939

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

637

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

940

638

return False

941

639

942

640

def __del__(self):

946

644

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

947

645

# and every interval from then on.

948

646

if self.checker_initiator_tag is not None:

949

GLib.source_remove(self.checker_initiator_tag)

950

self.checker_initiator_tag = GLib.timeout_add(

647

gobject.source_remove(self.checker_initiator_tag)

648

self.checker_initiator_tag = gobject.timeout_add(

951

649

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

952

650

self.start_checker)

953

651

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

954

652

if self.disable_initiator_tag is not None:

955

GLib.source_remove(self.disable_initiator_tag)

956

self.disable_initiator_tag = GLib.timeout_add(

653

gobject.source_remove(self.disable_initiator_tag)

654

self.disable_initiator_tag = gobject.timeout_add(

957

655

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

958

656

# Also start a new checker *right now*.

959

657

self.start_checker()

995

693

if timeout is None:

996

694

timeout = self.timeout

997

695

if self.disable_initiator_tag is not None:

998

GLib.source_remove(self.disable_initiator_tag)

696

gobject.source_remove(self.disable_initiator_tag)

999

697

self.disable_initiator_tag = None

1000

698

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

1001

self.disable_initiator_tag = GLib.timeout_add(

699

self.disable_initiator_tag = gobject.timeout_add(

1002

700

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

1003

701

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

1004

702

1059

757

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

1060

758

kwargs = popen_args)

1061

759

self.checker.start()

1062

self.checker_callback_tag = GLib.io_add_watch(

1063

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

760

self.checker_callback_tag = gobject.io_add_watch(

761

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

1064

762

self.checker_callback, pipe[0], command)

1065

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

763

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

1066

764

return True

1067

765

1068

766

def stop_checker(self):

1069

767

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

1070

768

if self.checker_callback_tag:

1071

GLib.source_remove(self.checker_callback_tag)

769

gobject.source_remove(self.checker_callback_tag)

1072

770

self.checker_callback_tag = None

1073

771

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

1074

772

return

1548

1246

interface_names.add(alt_interface)

1549

1247

# Is this a D-Bus signal?

1550

1248

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

1551

# Extract the original non-method undecorated

1552

# function by black magic

1553

1249

if sys.version_info.major == 2:

1250

# Extract the original non-method undecorated

1251

# function by black magic

1554

1252

nonmethod_func = (dict(

1555

1253

zip(attribute.func_code.co_freevars,

1556

1254

attribute.__closure__))

1557

1255

["func"].cell_contents)

1558

1256

else:

1559

nonmethod_func = (dict(

1560

zip(attribute.__code__.co_freevars,

1561

attribute.__closure__))

1562

["func"].cell_contents)

1257

nonmethod_func = attribute

1563

1258

# Create a new, but exactly alike, function

1564

1259

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

1565

1260

# with the alternate D-Bus interface name

1566

new_function = copy_function(nonmethod_func)

1261

if sys.version_info.major == 2:

1262

new_function = types.FunctionType(

1263

nonmethod_func.func_code,

1264

nonmethod_func.func_globals,

1265

nonmethod_func.func_name,

1266

nonmethod_func.func_defaults,

1267

nonmethod_func.func_closure)

1268

else:

1269

new_function = types.FunctionType(

1270

nonmethod_func.__code__,

1271

nonmethod_func.__globals__,

1272

nonmethod_func.__name__,

1273

nonmethod_func.__defaults__,

1274

nonmethod_func.__closure__)

1567

1275

new_function = (dbus.service.signal(

1568

1276

alt_interface,

1569

1277

attribute._dbus_signature)(new_function))

1608

1316

alt_interface,

1609

1317

attribute._dbus_in_signature,

1610

1318

attribute._dbus_out_signature)

1611

(copy_function(attribute)))

1319

(types.FunctionType(attribute.func_code,

1320

attribute.func_globals,

1321

attribute.func_name,

1322

attribute.func_defaults,

1323

attribute.func_closure)))

1612

1324

# Copy annotations, if any

1613

1325

try:

1614

1326

attr[attrname]._dbus_annotations = dict(

1626

1338

attribute._dbus_access,

1627

1339

attribute._dbus_get_args_options

1628

1340

["byte_arrays"])

1629

(copy_function(attribute)))

1341

(types.FunctionType(

1342

attribute.func_code,

1343

attribute.func_globals,

1344

attribute.func_name,

1345

attribute.func_defaults,

1346

attribute.func_closure)))

1630

1347

# Copy annotations, if any

1631

1348

try:

1632

1349

attr[attrname]._dbus_annotations = dict(

1641

1358

# to the class.

1642

1359

attr[attrname] = (

1643

1360

dbus_interface_annotations(alt_interface)

1644

(copy_function(attribute)))

1361

(types.FunctionType(attribute.func_code,

1362

attribute.func_globals,

1363

attribute.func_name,

1364

attribute.func_defaults,

1365

attribute.func_closure)))

1645

1366

if deprecate:

1646

1367

# Deprecate all alternate interfaces

1647

1368

iname="_AlternateDBusNames_interface_annotation{}"

1660

1381

if interface_names:

1661

1382

# Replace the class with a new subclass of it with

1662

1383

# methods, signals, etc. as created above.

1663

if sys.version_info.major == 2:

1664

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

1665

(cls, ), attr)

1666

else:

1667

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

1668

(cls, ), attr)

1384

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

1385

(cls, ), attr)

1669

1386

return cls

1670

1387

1671

1388

return wrapper

1829

1546

1830

1547

def approve(self, value=True):

1831

1548

self.approved = value

1832

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

1833

* 1000), self._reset_approved)

1549

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

1550

* 1000), self._reset_approved)

1834

1551

self.send_changedstate()

1835

1552

1836

1553

## D-Bus methods, signals & properties

2046

1763

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

2047

1764

is None):

2048

1765

return

2049

GLib.source_remove(self.disable_initiator_tag)

2050

self.disable_initiator_tag = GLib.timeout_add(

1766

gobject.source_remove(self.disable_initiator_tag)

1767

self.disable_initiator_tag = gobject.timeout_add(

2051

1768

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

2052

1769

self.disable)

2053

1770

2073

1790

return

2074

1791

if self.enabled:

2075

1792

# Reschedule checker run

2076

GLib.source_remove(self.checker_initiator_tag)

2077

self.checker_initiator_tag = GLib.timeout_add(

1793

gobject.source_remove(self.checker_initiator_tag)

1794

self.checker_initiator_tag = gobject.timeout_add(

2078

1795

value, self.start_checker)

2079

1796

self.start_checker() # Start one now, too

2080

1797

2162

1879

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

2163

1880

self.server.child_pipe.fileno())

2164

1881

2165

session = gnutls.ClientSession(self.request)

1882

session = gnutls.connection.ClientSession(

1883

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

1884

1885

# Note: gnutls.connection.X509Credentials is really a

1886

# generic GnuTLS certificate credentials object so long as

1887

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

1888

# here despite using OpenPGP certificates.

2166

1889

2167

1890

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

2168

1891

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

2172

1895

priority = self.server.gnutls_priority

2173

1896

if priority is None:

2174

1897

priority = "NORMAL"

2175

gnutls.priority_set_direct(session._c_object, priority,

2176

None)

1898

gnutls.library.functions.gnutls_priority_set_direct(

1899

session._c_object, priority, None)

2177

1900

2178

1901

# Start communication using the Mandos protocol

2179

1902

# Get protocol number

2189

1912

# Start GnuTLS connection

2190

1913

try:

2191

1914

session.handshake()

2192

except gnutls.Error as error:

1915

except gnutls.errors.GNUTLSError as error:

2193

1916

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

2194

1917

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

2195

1918

# established. Just abandon the request.

2201

1924

try:

2202

1925

fpr = self.fingerprint(

2203

1926

self.peer_certificate(session))

2204

except (TypeError, gnutls.Error) as error:

1927

except (TypeError,

1928

gnutls.errors.GNUTLSError) as error:

2205

1929

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

2206

1930

return

2207

1931

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

2265

1989

else:

2266

1990

delay -= time2 - time

2267

1991

2268

try:

2269

session.send(client.secret)

2270

except gnutls.Error as error:

2271

logger.warning("gnutls send failed",

2272

exc_info = error)

2273

return

1992

sent_size = 0

1993

while sent_size < len(client.secret):

1994

try:

1995

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

1996

except gnutls.errors.GNUTLSError as error:

1997

logger.warning("gnutls send failed",

1998

exc_info=error)

1999

return

2000

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

2001

len(client.secret) - (sent_size

2002

+ sent))

2003

sent_size += sent

2274

2004

2275

2005

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

2276

2006

# bump the timeout using extended_timeout

2284

2014

client.approvals_pending -= 1

2285

2015

try:

2286

2016

session.bye()

2287

except gnutls.Error as error:

2017

except gnutls.errors.GNUTLSError as error:

2288

2018

logger.warning("GnuTLS bye failed",

2289

2019

exc_info=error)

2290

2020

2292

2022

def peer_certificate(session):

2293

2023

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

2294

2024

# If not an OpenPGP certificate...

2295

if (gnutls.certificate_type_get(session._c_object)

2296

!= gnutls.CRT_OPENPGP):

2297

# ...return invalid data

2298

return b""

2025

if (gnutls.library.functions.gnutls_certificate_type_get(

2026

session._c_object)

2027

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

2028

# ...do the normal thing

2029

return session.peer_certificate

2299

2030

list_size = ctypes.c_uint(1)

2300

cert_list = (gnutls.certificate_get_peers

2031

cert_list = (gnutls.library.functions

2032

.gnutls_certificate_get_peers

2301

2033

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

2302

2034

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

2303

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

2035

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

2036

" certificate")

2304

2037

if list_size.value == 0:

2305

2038

return None

2306

2039

cert = cert_list[0]

2310

2043

def fingerprint(openpgp):

2311

2044

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2312

2045

# New GnuTLS "datum" with the OpenPGP public key

2313

datum = gnutls.datum_t(

2046

datum = gnutls.library.types.gnutls_datum_t(

2314

2047

ctypes.cast(ctypes.c_char_p(openpgp),

2315

2048

ctypes.POINTER(ctypes.c_ubyte)),

2316

2049

ctypes.c_uint(len(openpgp)))

2317

2050

# New empty GnuTLS certificate

2318

crt = gnutls.openpgp_crt_t()

2319

gnutls.openpgp_crt_init(ctypes.byref(crt))

2051

crt = gnutls.library.types.gnutls_openpgp_crt_t()

2052

gnutls.library.functions.gnutls_openpgp_crt_init(

2053

ctypes.byref(crt))

2320

2054

# Import the OpenPGP public key into the certificate

2321

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

2322

gnutls.OPENPGP_FMT_RAW)

2055

gnutls.library.functions.gnutls_openpgp_crt_import(

2056

crt, ctypes.byref(datum),

2057

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2323

2058

# Verify the self signature in the key

2324

2059

crtverify = ctypes.c_uint()

2325

gnutls.openpgp_crt_verify_self(crt, 0,

2326

ctypes.byref(crtverify))

2060

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

2061

crt, 0, ctypes.byref(crtverify))

2327

2062

if crtverify.value != 0:

2328

gnutls.openpgp_crt_deinit(crt)

2329

raise gnutls.CertificateSecurityError("Verify failed")

2063

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2064

raise gnutls.errors.CertificateSecurityError(

2065

"Verify failed")

2330

2066

# New buffer for the fingerprint

2331

2067

buf = ctypes.create_string_buffer(20)

2332

2068

buf_len = ctypes.c_size_t()

2333

2069

# Get the fingerprint from the certificate into the buffer

2334

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

2335

ctypes.byref(buf_len))

2070

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

2071

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

2336

2072

# Deinit the certificate

2337

gnutls.openpgp_crt_deinit(crt)

2073

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2338

2074

# Convert the buffer to a Python bytestring

2339

2075

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

2340

2076

# Convert the bytestring to hexadecimal notation

2484

2220

gnutls_priority GnuTLS priority string

2485

2221

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

2486

2222

2487

Assumes a GLib.MainLoop event loop.

2223

Assumes a gobject.MainLoop event loop.

2488

2224

"""

2489

2225

2490

2226

def __init__(self, server_address, RequestHandlerClass,

2515

2251

2516

2252

def add_pipe(self, parent_pipe, proc):

2517

2253

# Call "handle_ipc" for both data and EOF events

2518

GLib.io_add_watch(

2254

gobject.io_add_watch(

2519

2255

parent_pipe.fileno(),

2520

GLib.IO_IN | GLib.IO_HUP,

2256

gobject.IO_IN | gobject.IO_HUP,

2521

2257

functools.partial(self.handle_ipc,

2522

2258

parent_pipe = parent_pipe,

2523

2259

proc = proc))

2527

2263

proc = None,

2528

2264

client_object=None):

2529

2265

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

2530

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

2266

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

2531

2267

# Wait for other process to exit

2532

2268

proc.join()

2533

2269

return False

2540

2276

fpr = request[1]

2541

2277

address = request[2]

2542

2278

2543

for c in self.clients.values():

2279

for c in self.clients.itervalues():

2544

2280

if c.fingerprint == fpr:

2545

2281

client = c

2546

2282

break

2554

2290

parent_pipe.send(False)

2555

2291

return False

2556

2292

2557

GLib.io_add_watch(

2293

gobject.io_add_watch(

2558

2294

parent_pipe.fileno(),

2559

GLib.IO_IN | GLib.IO_HUP,

2295

gobject.IO_IN | gobject.IO_HUP,

2560

2296

functools.partial(self.handle_ipc,

2561

2297

parent_pipe = parent_pipe,

2562

2298

proc = proc,

2944

2680

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

2945

2681

exc_info=e)

2946

2682

2947

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

2948

("mandos", "mandos"),

2949

("nobody", "nogroup")):

2683

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

2950

2684

try:

2951

2685

uid = pwd.getpwnam(name).pw_uid

2952

gid = pwd.getpwnam(group).pw_gid

2686

gid = pwd.getpwnam(name).pw_gid

2953

2687

break

2954

2688

except KeyError:

2955

2689

continue

2959

2693

try:

2960

2694

os.setgid(gid)

2961

2695

os.setuid(uid)

2962

if debug:

2963

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

2964

gid))

2965

2696

except OSError as error:

2966

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

2967

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

2968

2697

if error.errno != errno.EPERM:

2969

2698

raise

2970

2699

2973

2702

2974

2703

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

2975

2704

# - GnuTLS manual

2976

gnutls.global_set_log_level(11)

2705

gnutls.library.functions.gnutls_global_set_log_level(11)

2977

2706

2978

@gnutls.log_func

2707

@gnutls.library.types.gnutls_log_func

2979

2708

def debug_gnutls(level, string):

2980

2709

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

2981

2710

2982

gnutls.global_set_log_function(debug_gnutls)

2711

gnutls.library.functions.gnutls_global_set_log_function(

2712

debug_gnutls)

2983

2713

2984

2714

# Redirect stdin so all checkers get /dev/null

2985

2715

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

2992

2722

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

2993

2723

daemon()

2994

2724

2995

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

2996

# to inform GLib that threads will be used.

2997

GLib.threads_init()

2725

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

2726

# need to inform gobject that threads will be used.

2727

gobject.threads_init()

2998

2728

2999

2729

global main_loop

3000

2730

# From the Avahi example code

3001

2731

DBusGMainLoop(set_as_default=True)

3002

main_loop = GLib.MainLoop()

2732

main_loop = gobject.MainLoop()

3003

2733

bus = dbus.SystemBus()

3004

2734

# End of Avahi example code

3005

2735

if use_dbus:

3049

2779

if server_settings["restore"]:

3050

2780

try:

3051

2781

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

3052

if sys.version_info.major == 2:

3053

clients_data, old_client_settings = pickle.load(

3054

stored_state)

3055

else:

3056

bytes_clients_data, bytes_old_client_settings = (

3057

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

3058

### Fix bytes to strings

3059

## clients_data

3060

# .keys()

3061

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

3062

if isinstance(key, bytes)

3063

else key): value

3064

for key, value in

3065

bytes_clients_data.items() }

3066

del bytes_clients_data

3067

for key in clients_data:

3068

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

3069

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

3070

for k, v in

3071

clients_data[key].items() }

3072

clients_data[key] = value

3073

# .client_structure

3074

value["client_structure"] = [

3075

(s.decode("utf-8")

3076

if isinstance(s, bytes)

3077

else s) for s in

3078

value["client_structure"] ]

3079

# .name & .host

3080

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

3081

if isinstance(value[k], bytes):

3082

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

3083

## old_client_settings

3084

# .keys()

3085

old_client_settings = {

3086

(key.decode("utf-8")

3087

if isinstance(key, bytes)

3088

else key): value

3089

for key, value in

3090

bytes_old_client_settings.items() }

3091

del bytes_old_client_settings

3092

# .host

3093

for value in old_client_settings.values():

3094

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

3095

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

3096

.decode("utf-8"))

2782

clients_data, old_client_settings = pickle.load(

2783

stored_state)

3097

2784

os.remove(stored_state_path)

3098

2785

except IOError as e:

3099

2786

if e.errno == errno.ENOENT:

3200

2887

del pidfile

3201

2888

del pidfilename

3202

2889

3203

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

3204

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3205

lambda: main_loop.quit() and False)

2890

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

2891

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

3206

2892

3207

2893

if use_dbus:

3208

2894

3239

2925

def GetAllClients(self):

3240

2926

"D-Bus method"

3241

2927

return dbus.Array(c.dbus_object_path for c in

3242

tcp_server.clients.values())

2928

tcp_server.clients.itervalues())

3243

2929

3244

2930

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

3245

2931

"true"})

3250

2936

return dbus.Dictionary(

3251

2937

{ c.dbus_object_path: c.GetAll(

3252

2938

"se.recompile.Mandos.Client")

3253

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

2939

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

3254

2940

signature="oa{sv}")

3255

2941

3256

2942

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

3257

2943

def RemoveClient(self, object_path):

3258

2944

"D-Bus method"

3259

for c in tcp_server.clients.values():

2945

for c in tcp_server.clients.itervalues():

3260

2946

if c.dbus_object_path == object_path:

3261

2947

del tcp_server.clients[c.name]

3262

2948

c.remove_from_connection()

3322

3008

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

3323

3009

clients = {}

3324

3010

with PGPEngine() as pgp:

3325

for client in tcp_server.clients.values():

3011

for client in tcp_server.clients.itervalues():

3326

3012

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

3327

3013

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

3328

3014

key)

3352

3038

prefix='clients-',

3353

3039

dir=os.path.dirname(stored_state_path),

3354

3040

delete=False) as stored_state:

3355

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

3356

protocol = 2)

3041

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

3357

3042

tempname = stored_state.name

3358

3043

os.rename(tempname, stored_state_path)

3359

3044

except (IOError, OSError) as e:

3384

3069

3385

3070

atexit.register(cleanup)

3386

3071

3387

for client in tcp_server.clients.values():

3072

for client in tcp_server.clients.itervalues():

3388

3073

if use_dbus:

3389

3074

# Emit D-Bus signal for adding

3390

3075

mandos_dbus_service.client_added_signal(client)

3419

3104

sys.exit(1)

3420

3105

# End of Avahi example code

3421

3106

3422

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

3423

lambda *args, **kwargs:

3424

(tcp_server.handle_request

3425

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

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))

3426

3111

3427

3112

logger.debug("Starting main loop")

3428

3113

main_loop.run()