/mandos/release : revision 348

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#!/usr/bin/python2.7

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#!/usr/bin/python

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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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from future_builtins import *

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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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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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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 gi.repository import GLib

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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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SO_BINDTODEVICE = None

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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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if sys.version_info.major == 2:

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str = unicode

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version = "1.6.9"

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version = "1.7.9"

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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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'--home', self.tempdir,

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'--homedir', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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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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def __enter__(self):

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return self

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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(['gpg', '--symmetric',

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

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proc = subprocess.Popen([self.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

532

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__,

556

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

557

# global variable has happened.

558

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

559

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

560

# code is passed, convert it to a string with

561

# gnutls.strerror()

562

self.code = code

563

if message is None and code is not None:

564

message = GnuTLS.strerror(code)

565

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

566

message, *args)

567

568

class CertificateSecurityError(Error):

569

pass

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571

# Classes

572

class Credentials(object):

573

def __init__(self):

574

self._c_object = gnutls.certificate_credentials_t()

575

gnutls.certificate_allocate_credentials(

576

ctypes.byref(self._c_object))

577

self.type = gnutls.CRD_CERTIFICATE

578

579

def __del__(self):

580

gnutls.certificate_free_credentials(self._c_object)

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582

class ClientSession(object):

583

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

584

self._c_object = gnutls.session_t()

585

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

586

gnutls.set_default_priority(self._c_object)

587

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

588

gnutls.handshake_set_private_extensions(self._c_object,

589

True)

590

self.socket = socket

591

if credentials is None:

592

credentials = gnutls.Credentials()

593

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

594

ctypes.cast(credentials._c_object,

595

ctypes.c_void_p))

596

self.credentials = credentials

597

598

def __del__(self):

599

gnutls.deinit(self._c_object)

600

601

def handshake(self):

602

return gnutls.handshake(self._c_object)

603

604

def send(self, data):

605

data = bytes(data)

606

data_len = len(data)

607

while data_len > 0:

608

data_len -= gnutls.record_send(self._c_object,

609

data[-data_len:],

610

data_len)

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612

def bye(self):

613

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

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615

# Error handling functions

616

def _error_code(result):

617

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

618

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

619

if result >= 0:

620

return result

621

if result == gnutls.E_NO_CERTIFICATE_FOUND:

622

raise gnutls.CertificateSecurityError(code = result)

623

raise gnutls.Error(code = result)

624

625

def _retry_on_error(result, func, arguments):

626

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

627

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

628

while result < 0:

629

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

630

return _error_code(result)

631

result = func(*arguments)

632

return result

633

634

# Unless otherwise indicated, the function declarations below are

635

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

636

637

# Functions

638

priority_set_direct = _library.gnutls_priority_set_direct

639

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

640

ctypes.POINTER(ctypes.c_char_p)]

641

priority_set_direct.restype = _error_code

642

643

init = _library.gnutls_init

644

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

645

init.restype = _error_code

646

647

set_default_priority = _library.gnutls_set_default_priority

648

set_default_priority.argtypes = [session_t]

649

set_default_priority.restype = _error_code

650

651

record_send = _library.gnutls_record_send

652

record_send.argtypes = [session_t, ctypes.c_void_p,

653

ctypes.c_size_t]

654

record_send.restype = ctypes.c_ssize_t

655

record_send.errcheck = _retry_on_error

656

657

certificate_allocate_credentials = (

658

_library.gnutls_certificate_allocate_credentials)

659

certificate_allocate_credentials.argtypes = [

660

ctypes.POINTER(certificate_credentials_t)]

661

certificate_allocate_credentials.restype = _error_code

662

663

certificate_free_credentials = (

664

_library.gnutls_certificate_free_credentials)

665

certificate_free_credentials.argtypes = [certificate_credentials_t]

666

certificate_free_credentials.restype = None

667

668

handshake_set_private_extensions = (

669

_library.gnutls_handshake_set_private_extensions)

670

handshake_set_private_extensions.argtypes = [session_t,

671

ctypes.c_int]

672

handshake_set_private_extensions.restype = None

673

674

credentials_set = _library.gnutls_credentials_set

675

credentials_set.argtypes = [session_t, credentials_type_t,

676

ctypes.c_void_p]

677

credentials_set.restype = _error_code

678

679

strerror = _library.gnutls_strerror

680

strerror.argtypes = [ctypes.c_int]

681

strerror.restype = ctypes.c_char_p

682

683

certificate_type_get = _library.gnutls_certificate_type_get

684

certificate_type_get.argtypes = [session_t]

685

certificate_type_get.restype = _error_code

686

687

certificate_get_peers = _library.gnutls_certificate_get_peers

688

certificate_get_peers.argtypes = [session_t,

689

ctypes.POINTER(ctypes.c_uint)]

690

certificate_get_peers.restype = ctypes.POINTER(datum_t)

691

692

global_set_log_level = _library.gnutls_global_set_log_level

693

global_set_log_level.argtypes = [ctypes.c_int]

694

global_set_log_level.restype = None

695

696

global_set_log_function = _library.gnutls_global_set_log_function

697

global_set_log_function.argtypes = [log_func]

698

global_set_log_function.restype = None

699

700

deinit = _library.gnutls_deinit

701

deinit.argtypes = [session_t]

702

deinit.restype = None

703

704

handshake = _library.gnutls_handshake

705

handshake.argtypes = [session_t]

706

handshake.restype = _error_code

707

handshake.errcheck = _retry_on_error

708

709

transport_set_ptr = _library.gnutls_transport_set_ptr

710

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

711

transport_set_ptr.restype = None

712

713

bye = _library.gnutls_bye

714

bye.argtypes = [session_t, close_request_t]

715

bye.restype = _error_code

716

bye.errcheck = _retry_on_error

717

718

check_version = _library.gnutls_check_version

719

check_version.argtypes = [ctypes.c_char_p]

720

check_version.restype = ctypes.c_char_p

721

722

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

723

724

openpgp_crt_init = _library.gnutls_openpgp_crt_init

725

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

726

openpgp_crt_init.restype = _error_code

727

728

openpgp_crt_import = _library.gnutls_openpgp_crt_import

729

openpgp_crt_import.argtypes = [openpgp_crt_t,

730

ctypes.POINTER(datum_t),

731

openpgp_crt_fmt_t]

732

openpgp_crt_import.restype = _error_code

733

734

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

735

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

736

ctypes.POINTER(ctypes.c_uint)]

737

openpgp_crt_verify_self.restype = _error_code

738

739

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

740

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

741

openpgp_crt_deinit.restype = None

742

743

openpgp_crt_get_fingerprint = (

744

_library.gnutls_openpgp_crt_get_fingerprint)

745

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

746

ctypes.c_void_p,

747

ctypes.POINTER(

748

ctypes.c_size_t)]

749

openpgp_crt_get_fingerprint.restype = _error_code

750

751

# Remove non-public functions

752

del _error_code, _retry_on_error

753

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

754

gnutls = GnuTLS()

755

438

756

def call_pipe(connection, # : multiprocessing.Connection

439

757

func, *args, **kwargs):

440

758

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

455

773

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

456

774

to see if the client lives.

457

775

'None' if no process is running.

458

checker_callback_tag: a gobject event source tag, or None

776

checker_callback_tag: a GLib event source tag, or None

459

777

checker_command: string; External command which is run to check

460

778

if client lives. %() expansions are done at

461

779

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

462

780

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

463

checker_initiator_tag: a gobject event source tag, or None

781

checker_initiator_tag: a GLib event source tag, or None

464

782

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

465

783

client_structure: Object describing what attributes a client has

466

784

and is used for storing the client at exit

467

785

current_checker_command: string; current running checker_command

468

disable_initiator_tag: a gobject event source tag, or None

786

disable_initiator_tag: a GLib event source tag, or None

469

787

enabled: bool()

470

788

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

471

789

uniquely identify the client

534

852

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

535

853

.replace(" ", ""))

536

854

if "secret" in section:

537

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

855

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

856

.encode("utf-8"),

857

"base64")

538

858

elif "secfile" in section:

539

859

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

540

860

(section["secfile"])),

593

913

self.changedstate = multiprocessing_manager.Condition(

594

914

multiprocessing_manager.Lock())

595

915

self.client_structure = [attr

596

for attr in self.__dict__.iterkeys()

916

for attr in self.__dict__.keys()

597

917

if not attr.startswith("_")]

598

918

self.client_structure.append("client_structure")

599

919

625

945

if not quiet:

626

946

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

627

947

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

628

gobject.source_remove(self.disable_initiator_tag)

948

GLib.source_remove(self.disable_initiator_tag)

629

949

self.disable_initiator_tag = None

630

950

self.expires = None

631

951

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

632

gobject.source_remove(self.checker_initiator_tag)

952

GLib.source_remove(self.checker_initiator_tag)

633

953

self.checker_initiator_tag = None

634

954

self.stop_checker()

635

955

self.enabled = False

636

956

if not quiet:

637

957

self.send_changedstate()

638

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

958

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

639

959

return False

640

960

641

961

def __del__(self):

645

965

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

646

966

# and every interval from then on.

647

967

if self.checker_initiator_tag is not None:

648

gobject.source_remove(self.checker_initiator_tag)

649

self.checker_initiator_tag = gobject.timeout_add(

968

GLib.source_remove(self.checker_initiator_tag)

969

self.checker_initiator_tag = GLib.timeout_add(

650

970

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

651

971

self.start_checker)

652

972

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

653

973

if self.disable_initiator_tag is not None:

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = gobject.timeout_add(

974

GLib.source_remove(self.disable_initiator_tag)

975

self.disable_initiator_tag = GLib.timeout_add(

656

976

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

657

977

# Also start a new checker *right now*.

658

978

self.start_checker()

694

1014

if timeout is None:

695

1015

timeout = self.timeout

696

1016

if self.disable_initiator_tag is not None:

697

gobject.source_remove(self.disable_initiator_tag)

1017

GLib.source_remove(self.disable_initiator_tag)

698

1018

self.disable_initiator_tag = None

699

1019

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

700

self.disable_initiator_tag = gobject.timeout_add(

1020

self.disable_initiator_tag = GLib.timeout_add(

701

1021

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

702

1022

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

703

1023

758

1078

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

759

1079

kwargs = popen_args)

760

1080

self.checker.start()

761

self.checker_callback_tag = gobject.io_add_watch(

762

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

1081

self.checker_callback_tag = GLib.io_add_watch(

1082

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

763

1083

self.checker_callback, pipe[0], command)

764

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

1084

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

765

1085

return True

766

1086

767

1087

def stop_checker(self):

768

1088

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

769

1089

if self.checker_callback_tag:

770

gobject.source_remove(self.checker_callback_tag)

1090

GLib.source_remove(self.checker_callback_tag)

771

1091

self.checker_callback_tag = None

772

1092

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

773

1093

return

1247

1567

interface_names.add(alt_interface)

1248

1568

# Is this a D-Bus signal?

1249

1569

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

1570

# Extract the original non-method undecorated

1571

# function by black magic

1250

1572

if sys.version_info.major == 2:

1251

# Extract the original non-method undecorated

1252

# function by black magic

1253

1573

nonmethod_func = (dict(

1254

1574

zip(attribute.func_code.co_freevars,

1255

1575

attribute.__closure__))

1256

1576

["func"].cell_contents)

1257

1577

else:

1258

nonmethod_func = attribute

1578

nonmethod_func = (dict(

1579

zip(attribute.__code__.co_freevars,

1580

attribute.__closure__))

1581

["func"].cell_contents)

1259

1582

# Create a new, but exactly alike, function

1260

1583

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

1261

1584

# with the alternate D-Bus interface name

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__)

1585

new_function = copy_function(nonmethod_func)

1276

1586

new_function = (dbus.service.signal(

1277

1587

alt_interface,

1278

1588

attribute._dbus_signature)(new_function))

1317

1627

alt_interface,

1318

1628

attribute._dbus_in_signature,

1319

1629

attribute._dbus_out_signature)

1320

(types.FunctionType(attribute.func_code,

1321

attribute.func_globals,

1322

attribute.func_name,

1323

attribute.func_defaults,

1324

attribute.func_closure)))

1630

(copy_function(attribute)))

1325

1631

# Copy annotations, if any

1326

1632

try:

1327

1633

attr[attrname]._dbus_annotations = dict(

1339

1645

attribute._dbus_access,

1340

1646

attribute._dbus_get_args_options

1341

1647

["byte_arrays"])

1342

(types.FunctionType(

1343

attribute.func_code,

1344

attribute.func_globals,

1345

attribute.func_name,

1346

attribute.func_defaults,

1347

attribute.func_closure)))

1648

(copy_function(attribute)))

1348

1649

# Copy annotations, if any

1349

1650

try:

1350

1651

attr[attrname]._dbus_annotations = dict(

1359

1660

# to the class.

1360

1661

attr[attrname] = (

1361

1662

dbus_interface_annotations(alt_interface)

1362

(types.FunctionType(attribute.func_code,

1363

attribute.func_globals,

1364

attribute.func_name,

1365

attribute.func_defaults,

1366

attribute.func_closure)))

1663

(copy_function(attribute)))

1367

1664

if deprecate:

1368

1665

# Deprecate all alternate interfaces

1369

1666

iname="_AlternateDBusNames_interface_annotation{}"

1382

1679

if interface_names:

1383

1680

# Replace the class with a new subclass of it with

1384

1681

# methods, signals, etc. as created above.

1385

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

1386

(cls, ), attr)

1682

if sys.version_info.major == 2:

1683

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

1684

(cls, ), attr)

1685

else:

1686

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

1687

(cls, ), attr)

1387

1688

return cls

1388

1689

1389

1690

return wrapper

1547

1848

1548

1849

def approve(self, value=True):

1549

1850

self.approved = value

1550

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

1551

* 1000), self._reset_approved)

1851

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

1852

* 1000), self._reset_approved)

1552

1853

self.send_changedstate()

1553

1854

1554

1855

## D-Bus methods, signals & properties

1764

2065

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

1765

2066

is None):

1766

2067

return

1767

gobject.source_remove(self.disable_initiator_tag)

1768

self.disable_initiator_tag = gobject.timeout_add(

2068

GLib.source_remove(self.disable_initiator_tag)

2069

self.disable_initiator_tag = GLib.timeout_add(

1769

2070

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

1770

2071

self.disable)

1771

2072

1791

2092

return

1792

2093

if self.enabled:

1793

2094

# Reschedule checker run

1794

gobject.source_remove(self.checker_initiator_tag)

1795

self.checker_initiator_tag = gobject.timeout_add(

2095

GLib.source_remove(self.checker_initiator_tag)

2096

self.checker_initiator_tag = GLib.timeout_add(

1796

2097

value, self.start_checker)

1797

2098

self.start_checker() # Start one now, too

1798

2099

1880

2181

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

1881

2182

self.server.child_pipe.fileno())

1882

2183

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.

2184

session = gnutls.ClientSession(self.request)

1890

2185

1891

2186

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

1892

2187

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

1896

2191

priority = self.server.gnutls_priority

1897

2192

if priority is None:

1898

2193

priority = "NORMAL"

1899

gnutls.library.functions.gnutls_priority_set_direct(

1900

session._c_object, priority, None)

2194

gnutls.priority_set_direct(session._c_object,

2195

priority.encode("utf-8"),

2196

None)

1901

2197

1902

2198

# Start communication using the Mandos protocol

1903

2199

# Get protocol number

1913

2209

# Start GnuTLS connection

1914

2210

try:

1915

2211

session.handshake()

1916

except gnutls.errors.GNUTLSError as error:

2212

except gnutls.Error as error:

1917

2213

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

1918

2214

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

1919

2215

# established. Just abandon the request.

1925

2221

try:

1926

2222

fpr = self.fingerprint(

1927

2223

self.peer_certificate(session))

1928

except (TypeError,

1929

gnutls.errors.GNUTLSError) as error:

2224

except (TypeError, gnutls.Error) as error:

1930

2225

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

1931

2226

return

1932

2227

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

1990

2285

else:

1991

2286

delay -= time2 - time

1992

2287

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

2288

try:

2289

session.send(client.secret)

2290

except gnutls.Error as error:

2291

logger.warning("gnutls send failed",

2292

exc_info = error)

2293

return

2005

2294

2006

2295

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

2007

2296

# bump the timeout using extended_timeout

2015

2304

client.approvals_pending -= 1

2016

2305

try:

2017

2306

session.bye()

2018

except gnutls.errors.GNUTLSError as error:

2307

except gnutls.Error as error:

2019

2308

logger.warning("GnuTLS bye failed",

2020

2309

exc_info=error)

2021

2310

2023

2312

def peer_certificate(session):

2024

2313

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

2025

2314

# 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

2315

if (gnutls.certificate_type_get(session._c_object)

2316

!= gnutls.CRT_OPENPGP):

2317

# ...return invalid data

2318

return b""

2031

2319

list_size = ctypes.c_uint(1)

2032

cert_list = (gnutls.library.functions

2033

.gnutls_certificate_get_peers

2320

cert_list = (gnutls.certificate_get_peers

2034

2321

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

2035

2322

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

2036

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

2037

" certificate")

2323

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

2038

2324

if list_size.value == 0:

2039

2325

return None

2040

2326

cert = cert_list[0]

2044

2330

def fingerprint(openpgp):

2045

2331

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2046

2332

# New GnuTLS "datum" with the OpenPGP public key

2047

datum = gnutls.library.types.gnutls_datum_t(

2333

datum = gnutls.datum_t(

2048

2334

ctypes.cast(ctypes.c_char_p(openpgp),

2049

2335

ctypes.POINTER(ctypes.c_ubyte)),

2050

2336

ctypes.c_uint(len(openpgp)))

2051

2337

# New empty GnuTLS certificate

2052

crt = gnutls.library.types.gnutls_openpgp_crt_t()

2053

gnutls.library.functions.gnutls_openpgp_crt_init(

2054

ctypes.byref(crt))

2338

crt = gnutls.openpgp_crt_t()

2339

gnutls.openpgp_crt_init(ctypes.byref(crt))

2055

2340

# Import the OpenPGP public key into the certificate

2056

gnutls.library.functions.gnutls_openpgp_crt_import(

2057

crt, ctypes.byref(datum),

2058

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2341

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

2342

gnutls.OPENPGP_FMT_RAW)

2059

2343

# Verify the self signature in the key

2060

2344

crtverify = ctypes.c_uint()

2061

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

2062

crt, 0, ctypes.byref(crtverify))

2345

gnutls.openpgp_crt_verify_self(crt, 0,

2346

ctypes.byref(crtverify))

2063

2347

if crtverify.value != 0:

2064

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2065

raise gnutls.errors.CertificateSecurityError(

2066

"Verify failed")

2348

gnutls.openpgp_crt_deinit(crt)

2349

raise gnutls.CertificateSecurityError("Verify failed")

2067

2350

# New buffer for the fingerprint

2068

2351

buf = ctypes.create_string_buffer(20)

2069

2352

buf_len = ctypes.c_size_t()

2070

2353

# Get the fingerprint from the certificate into the buffer

2071

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

2072

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

2354

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

2355

ctypes.byref(buf_len))

2073

2356

# Deinit the certificate

2074

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2357

gnutls.openpgp_crt_deinit(crt)

2075

2358

# Convert the buffer to a Python bytestring

2076

2359

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

2077

2360

# Convert the bytestring to hexadecimal notation

2170

2453

"""This overrides the normal server_bind() function

2171

2454

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

2172

2455

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

2456

global SO_BINDTODEVICE

2173

2457

if self.interface is not None:

2174

2458

if SO_BINDTODEVICE is None:

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

2459

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

2460

# common enough.

2461

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

2462

SO_BINDTODEVICE = 25

2463

try:

2464

self.socket.setsockopt(

2465

socket.SOL_SOCKET, SO_BINDTODEVICE,

2466

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

2467

except socket.error as error:

2468

if error.errno == errno.EPERM:

2469

logger.error("No permission to bind to"

2470

" interface %s", self.interface)

2471

elif error.errno == errno.ENOPROTOOPT:

2472

logger.error("SO_BINDTODEVICE not available;"

2473

" cannot bind to interface %s",

2474

self.interface)

2475

elif error.errno == errno.ENODEV:

2476

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

2477

" cannot bind", self.interface)

2478

else:

2479

raise

2196

2480

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

2197

2481

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

2198

2482

if not self.server_address[0]:

2221

2505

gnutls_priority GnuTLS priority string

2222

2506

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

2223

2507

2224

Assumes a gobject.MainLoop event loop.

2508

Assumes a GLib.MainLoop event loop.

2225

2509

"""

2226

2510

2227

2511

def __init__(self, server_address, RequestHandlerClass,

2252

2536

2253

2537

def add_pipe(self, parent_pipe, proc):

2254

2538

# Call "handle_ipc" for both data and EOF events

2255

gobject.io_add_watch(

2539

GLib.io_add_watch(

2256

2540

parent_pipe.fileno(),

2257

gobject.IO_IN | gobject.IO_HUP,

2541

GLib.IO_IN | GLib.IO_HUP,

2258

2542

functools.partial(self.handle_ipc,

2259

2543

parent_pipe = parent_pipe,

2260

2544

proc = proc))

2264

2548

proc = None,

2265

2549

client_object=None):

2266

2550

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

2267

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

2551

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

2268

2552

# Wait for other process to exit

2269

2553

proc.join()

2270

2554

return False

2277

2561

fpr = request[1]

2278

2562

address = request[2]

2279

2563

2280

for c in self.clients.itervalues():

2564

for c in self.clients.values():

2281

2565

if c.fingerprint == fpr:

2282

2566

client = c

2283

2567

break

2291

2575

parent_pipe.send(False)

2292

2576

return False

2293

2577

2294

gobject.io_add_watch(

2578

GLib.io_add_watch(

2295

2579

parent_pipe.fileno(),

2296

gobject.IO_IN | gobject.IO_HUP,

2580

GLib.IO_IN | GLib.IO_HUP,

2297

2581

functools.partial(self.handle_ipc,

2298

2582

parent_pipe = parent_pipe,

2299

2583

proc = proc,

2681

2965

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

2682

2966

exc_info=e)

2683

2967

2684

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

2968

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

2969

("mandos", "mandos"),

2970

("nobody", "nogroup")):

2685

2971

try:

2686

2972

uid = pwd.getpwnam(name).pw_uid

2687

gid = pwd.getpwnam(name).pw_gid

2973

gid = pwd.getpwnam(group).pw_gid

2688

2974

break

2689

2975

except KeyError:

2690

2976

continue

2694

2980

try:

2695

2981

os.setgid(gid)

2696

2982

os.setuid(uid)

2983

if debug:

2984

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

2985

gid))

2697

2986

except OSError as error:

2987

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

2988

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

2698

2989

if error.errno != errno.EPERM:

2699

2990

raise

2700

2991

2703

2994

2704

2995

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

2705

2996

# - GnuTLS manual

2706

gnutls.library.functions.gnutls_global_set_log_level(11)

2997

gnutls.global_set_log_level(11)

2707

2998

2708

@gnutls.library.types.gnutls_log_func

2999

@gnutls.log_func

2709

3000

def debug_gnutls(level, string):

2710

3001

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

2711

3002

2712

gnutls.library.functions.gnutls_global_set_log_function(

2713

debug_gnutls)

3003

gnutls.global_set_log_function(debug_gnutls)

2714

3004

2715

3005

# Redirect stdin so all checkers get /dev/null

2716

3006

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

2723

3013

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

2724

3014

daemon()

2725

3015

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()

3016

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

3017

# to inform GLib that threads will be used.

3018

GLib.threads_init()

2729

3019

2730

3020

global main_loop

2731

3021

# From the Avahi example code

2732

3022

DBusGMainLoop(set_as_default=True)

2733

main_loop = gobject.MainLoop()

3023

main_loop = GLib.MainLoop()

2734

3024

bus = dbus.SystemBus()

2735

3025

# End of Avahi example code

2736

3026

if use_dbus:

2780

3070

if server_settings["restore"]:

2781

3071

try:

2782

3072

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

2783

clients_data, old_client_settings = pickle.load(

2784

stored_state)

3073

if sys.version_info.major == 2:

3074

clients_data, old_client_settings = pickle.load(

3075

stored_state)

3076

else:

3077

bytes_clients_data, bytes_old_client_settings = (

3078

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

3079

### Fix bytes to strings

3080

## clients_data

3081

# .keys()

3082

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

3083

if isinstance(key, bytes)

3084

else key): value

3085

for key, value in

3086

bytes_clients_data.items() }

3087

del bytes_clients_data

3088

for key in clients_data:

3089

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

3090

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

3091

for k, v in

3092

clients_data[key].items() }

3093

clients_data[key] = value

3094

# .client_structure

3095

value["client_structure"] = [

3096

(s.decode("utf-8")

3097

if isinstance(s, bytes)

3098

else s) for s in

3099

value["client_structure"] ]

3100

# .name & .host

3101

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

3102

if isinstance(value[k], bytes):

3103

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

3104

## old_client_settings

3105

# .keys()

3106

old_client_settings = {

3107

(key.decode("utf-8")

3108

if isinstance(key, bytes)

3109

else key): value

3110

for key, value in

3111

bytes_old_client_settings.items() }

3112

del bytes_old_client_settings

3113

# .host

3114

for value in old_client_settings.values():

3115

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

3116

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

3117

.decode("utf-8"))

2785

3118

os.remove(stored_state_path)

2786

3119

except IOError as e:

2787

3120

if e.errno == errno.ENOENT:

2888

3221

del pidfile

2889

3222

del pidfilename

2890

3223

2891

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

2892

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

3224

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

3225

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3226

lambda: main_loop.quit() and False)

2893

3227

2894

3228

if use_dbus:

2895

3229

2926

3260

def GetAllClients(self):

2927

3261

"D-Bus method"

2928

3262

return dbus.Array(c.dbus_object_path for c in

2929

tcp_server.clients.itervalues())

3263

tcp_server.clients.values())

2930

3264

2931

3265

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

2932

3266

"true"})

2937

3271

return dbus.Dictionary(

2938

3272

{ c.dbus_object_path: c.GetAll(

2939

3273

"se.recompile.Mandos.Client")

2940

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

3274

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

2941

3275

signature="oa{sv}")

2942

3276

2943

3277

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

2944

3278

def RemoveClient(self, object_path):

2945

3279

"D-Bus method"

2946

for c in tcp_server.clients.itervalues():

3280

for c in tcp_server.clients.values():

2947

3281

if c.dbus_object_path == object_path:

2948

3282

del tcp_server.clients[c.name]

2949

3283

c.remove_from_connection()

2994

3328

2995

3329

mandos_dbus_service = MandosDBusService()

2996

3330

3331

# Save modules to variables to exempt the modules from being

3332

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

3333

mp = multiprocessing

3334

wn = wnull

2997

3335

def cleanup():

2998

3336

"Cleanup function; run on exit"

2999

3337

if zeroconf:

3000

3338

service.cleanup()

3001

3339

3002

multiprocessing.active_children()

3003

wnull.close()

3340

mp.active_children()

3341

wn.close()

3004

3342

if not (tcp_server.clients or client_settings):

3005

3343

return

3006

3344

3009

3347

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

3010

3348

clients = {}

3011

3349

with PGPEngine() as pgp:

3012

for client in tcp_server.clients.itervalues():

3350

for client in tcp_server.clients.values():

3013

3351

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

3014

3352

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

3015

3353

key)

3039

3377

prefix='clients-',

3040

3378

dir=os.path.dirname(stored_state_path),

3041

3379

delete=False) as stored_state:

3042

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

3380

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

3381

protocol = 2)

3043

3382

tempname = stored_state.name

3044

3383

os.rename(tempname, stored_state_path)

3045

3384

except (IOError, OSError) as e:

3064

3403

# Don't signal the disabling

3065

3404

client.disable(quiet=True)

3066

3405

# Emit D-Bus signal for removal

3067

mandos_dbus_service.client_removed_signal(client)

3406

if use_dbus:

3407

mandos_dbus_service.client_removed_signal(client)

3068

3408

client_settings.clear()

3069

3409

3070

3410

atexit.register(cleanup)

3071

3411

3072

for client in tcp_server.clients.itervalues():

3412

for client in tcp_server.clients.values():

3073

3413

if use_dbus:

3074

3414

# Emit D-Bus signal for adding

3075

3415

mandos_dbus_service.client_added_signal(client)

3104

3444

sys.exit(1)

3105

3445

# End of Avahi example code

3106

3446

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))

3447

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

3448

lambda *args, **kwargs:

3449

(tcp_server.handle_request

3450

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

3111

3451

3112

3452

logger.debug("Starting main loop")

3113

3453

main_loop.run()