/mandos/release : revision 5

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#!/usr/bin/python3 -bI

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# -*- mode: python; after-save-hook: (lambda () (let ((command (if (fboundp 'file-local-name) (file-local-name (buffer-file-name)) (or (file-remote-p (buffer-file-name) 'localname) (buffer-file-name))))) (if (= (progn (if (get-buffer "*Test*") (kill-buffer "*Test*")) (process-file-shell-command (format "%s --check" (shell-quote-argument command)) nil "*Test*")) 0) (let ((w (get-buffer-window "*Test*"))) (if w (delete-window w))) (progn (with-current-buffer "*Test*" (compilation-mode)) (display-buffer "*Test*" '(display-buffer-in-side-window)))))); coding: utf-8 -*-

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#

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

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#

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

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# service publisher, downloaded from

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

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

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

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

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#

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# Everything else is

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15

16

#

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# This file is part of Mandos.

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#

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

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

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

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# (at your option) any later version.

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#

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

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# WITHOUT ANY WARRANTY; without even the implied warranty of

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

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# GNU General Public License for more details.

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#

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

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

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#

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

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#

34

35

from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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38

try:

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from future_builtins import *

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except ImportError:

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pass

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43

try:

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import SocketServer as socketserver

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except ImportError:

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import socketserver

1

#!/usr/bin/python

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3

import SocketServer

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4

import socket

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import argparse

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import select

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from optparse import OptionParser

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7

import datetime

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8

import errno

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try:

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import ConfigParser as configparser

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except ImportError:

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import configparser

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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 ConfigParser

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13

import sys

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import re

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import os

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import signal

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import subprocess

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import atexit

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import stat

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import logging

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import logging.handlers

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import pwd

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import contextlib

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import struct

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import fcntl

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import functools

69

try:

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import cPickle as pickle

71

except ImportError:

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import pickle

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import multiprocessing

74

import types

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import binascii

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import tempfile

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import itertools

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import collections

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import codecs

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import unittest

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import random

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import shlex

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import dbus

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import dbus.service

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import gi

87

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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94

if sys.version_info.major == 2:

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__metaclass__ = type

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str = unicode

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98

# Add collections.abc.Callable if it does not exist

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try:

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collections.abc.Callable

101

except AttributeError:

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class abc:

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Callable = collections.Callable

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collections.abc = abc

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del abc

106

107

# Add shlex.quote if it does not exist

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try:

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shlex.quote

110

except AttributeError:

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shlex.quote = re.escape

112

113

# Show warnings by default

114

if not sys.warnoptions:

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import warnings

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warnings.simplefilter("default")

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118

# Try to find the value of SO_BINDTODEVICE:

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try:

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

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

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except AttributeError:

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try:

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# This is where SO_BINDTODEVICE was up to and including Python

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# 2.6, and also 3.2:

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from IN import SO_BINDTODEVICE

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except ImportError:

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

130

# Try running the C preprocessor:

131

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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143

if sys.version_info < (3, 2):

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configparser.Configparser = configparser.SafeConfigParser

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146

version = "1.8.9"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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logging.captureWarnings(True) # Show warnings via the logging system

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syslogger = None

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153

try:

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if_nametoindex = ctypes.cdll.LoadLibrary(

155

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

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except (OSError, AttributeError):

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158

def if_nametoindex(interface):

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

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

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with contextlib.closing(socket.socket()) as s:

162

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(b"16s16x", interface))

164

interface_index = struct.unpack("I", ifreq[16:20])[0]

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return interface_index

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167

168

def copy_function(func):

169

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

170

if sys.version_info.major == 2:

171

return types.FunctionType(func.func_code,

172

func.func_globals,

173

func.func_name,

174

func.func_defaults,

175

func.func_closure)

176

else:

177

return types.FunctionType(func.__code__,

178

func.__globals__,

179

func.__name__,

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func.__defaults__,

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func.__closure__)

182

183

184

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

185

"""init logger and add loglevel"""

186

187

global syslogger

188

syslogger = (logging.handlers.SysLogHandler(

189

facility=logging.handlers.SysLogHandler.LOG_DAEMON,

190

address="/dev/log"))

191

syslogger.setFormatter(logging.Formatter

192

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

193

' %(message)s'))

194

logger.addHandler(syslogger)

195

196

if debug:

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console = logging.StreamHandler()

198

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

202

logger.addHandler(console)

203

logger.setLevel(level)

204

205

206

class PGPError(Exception):

207

"""Exception if encryption/decryption fails"""

208

pass

209

210

211

class PGPEngine:

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

213

214

def __init__(self):

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

216

self.gpg = "gpg"

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try:

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

219

for line in output.splitlines():

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

221

if name == b"gpg":

222

self.gpg = path

223

break

224

except OSError as e:

225

if e.errno != errno.ENOENT:

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raise

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self.gnupgargs = ['--batch',

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'--homedir', self.tempdir,

229

'--force-mdc',

230

'--quiet']

231

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

232

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

233

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

234

235

def __enter__(self):

236

return self

237

238

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

239

self._cleanup()

240

return False

241

242

def __del__(self):

243

self._cleanup()

244

245

def _cleanup(self):

246

if self.tempdir is not None:

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# Delete contents of tempdir

248

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

249

topdown=False):

250

for filename in files:

251

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

252

for dirname in dirs:

253

os.rmdir(os.path.join(root, dirname))

254

# Remove tempdir

255

os.rmdir(self.tempdir)

256

self.tempdir = None

257

258

def password_encode(self, password):

259

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

260

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

261

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

262

if len(encoded) > 2048:

263

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

264

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

265

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

266

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

267

return encoded

268

269

def encrypt(self, data, password):

270

passphrase = self.password_encode(password)

271

with tempfile.NamedTemporaryFile(

272

dir=self.tempdir) as passfile:

273

passfile.write(passphrase)

274

passfile.flush()

275

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

276

'--passphrase-file',

277

passfile.name]

278

+ self.gnupgargs,

279

stdin=subprocess.PIPE,

280

stdout=subprocess.PIPE,

281

stderr=subprocess.PIPE)

282

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

283

if proc.returncode != 0:

284

raise PGPError(err)

285

return ciphertext

286

287

def decrypt(self, data, password):

288

passphrase = self.password_encode(password)

289

with tempfile.NamedTemporaryFile(

290

dir=self.tempdir) as passfile:

291

passfile.write(passphrase)

292

passfile.flush()

293

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

294

'--passphrase-file',

295

passfile.name]

296

+ self.gnupgargs,

297

stdin=subprocess.PIPE,

298

stdout=subprocess.PIPE,

299

stderr=subprocess.PIPE)

300

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

301

if proc.returncode != 0:

302

raise PGPError(err)

303

return decrypted_plaintext

304

305

306

# Pretend that we have an Avahi module

307

class avahi:

308

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

309

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

310

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

311

PROTO_INET = 0 # avahi-common/address.h

312

PROTO_INET6 = 1 # avahi-common/address.h

313

DBUS_NAME = "org.freedesktop.Avahi"

314

DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

315

DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

316

DBUS_PATH_SERVER = "/"

317

318

@staticmethod

319

def string_array_to_txt_array(t):

320

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

321

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

322

ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

323

ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

324

ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

325

SERVER_INVALID = 0 # avahi-common/defs.h

326

SERVER_REGISTERING = 1 # avahi-common/defs.h

327

SERVER_RUNNING = 2 # avahi-common/defs.h

328

SERVER_COLLISION = 3 # avahi-common/defs.h

329

SERVER_FAILURE = 4 # avahi-common/defs.h

330

331

332

class AvahiError(Exception):

333

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

334

self.value = value

335

return super(AvahiError, self).__init__(value, *args,

336

**kwargs)

337

338

339

class AvahiServiceError(AvahiError):

340

pass

341

342

343

class AvahiGroupError(AvahiError):

344

pass

345

346

347

class AvahiService:

348

"""An Avahi (Zeroconf) service.

349

350

Attributes:

351

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

352

Used to optionally bind to the specified interface.

353

name: string; Example: 'Mandos'

354

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

355

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

356

port: integer; what port to announce

357

TXT: list of strings; TXT record for the service

358

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

359

host: string; Host to publish records for, default is localhost

360

max_renames: integer; maximum number of renames

361

rename_count: integer; counter so we only rename after collisions

362

a sensible number of times

363

group: D-Bus Entry Group

364

server: D-Bus Server

365

bus: dbus.SystemBus()

366

"""

367

368

def __init__(self,

369

interface=avahi.IF_UNSPEC,

370

name=None,

371

servicetype=None,

372

port=None,

373

TXT=None,

374

domain="",

375

host="",

376

max_renames=32768,

377

protocol=avahi.PROTO_UNSPEC,

378

bus=None):

379

self.interface = interface

380

self.name = name

381

self.type = servicetype

382

self.port = port

383

self.TXT = TXT if TXT is not None else []

384

self.domain = domain

385

self.host = host

386

self.rename_count = 0

387

self.max_renames = max_renames

388

self.protocol = protocol

389

self.group = None # our entry group

390

self.server = None

391

self.bus = bus

392

self.entry_group_state_changed_match = None

393

394

def rename(self, remove=True):

395

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

396

if self.rename_count >= self.max_renames:

397

logger.critical("No suitable Zeroconf service name found"

398

" after %i retries, exiting.",

399

self.rename_count)

400

raise AvahiServiceError("Too many renames")

401

self.name = str(

402

self.server.GetAlternativeServiceName(self.name))

403

self.rename_count += 1

404

logger.info("Changing Zeroconf service name to %r ...",

405

self.name)

406

if remove:

407

self.remove()

408

try:

409

self.add()

410

except dbus.exceptions.DBusException as error:

411

if (error.get_dbus_name()

412

== "org.freedesktop.Avahi.CollisionError"):

413

logger.info("Local Zeroconf service name collision.")

414

return self.rename(remove=False)

415

else:

416

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

417

self.cleanup()

418

os._exit(1)

419

420

def remove(self):

421

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

422

if self.entry_group_state_changed_match is not None:

423

self.entry_group_state_changed_match.remove()

424

self.entry_group_state_changed_match = None

425

if self.group is not None:

426

self.group.Reset()

427

428

def add(self):

429

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

430

self.remove()

431

if self.group is None:

432

self.group = dbus.Interface(

433

self.bus.get_object(avahi.DBUS_NAME,

434

self.server.EntryGroupNew()),

435

avahi.DBUS_INTERFACE_ENTRY_GROUP)

436

self.entry_group_state_changed_match = (

437

self.group.connect_to_signal(

438

'StateChanged', self.entry_group_state_changed))

439

logger.debug("Adding Zeroconf service '%s' of type '%s' ...",

440

self.name, self.type)

441

self.group.AddService(

442

self.interface,

443

self.protocol,

444

dbus.UInt32(0), # flags

445

self.name, self.type,

446

self.domain, self.host,

447

dbus.UInt16(self.port),

448

avahi.string_array_to_txt_array(self.TXT))

449

self.group.Commit()

450

451

def entry_group_state_changed(self, state, error):

452

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

453

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

454

455

if state == avahi.ENTRY_GROUP_ESTABLISHED:

456

logger.debug("Zeroconf service established.")

457

elif state == avahi.ENTRY_GROUP_COLLISION:

458

logger.info("Zeroconf service name collision.")

459

self.rename()

460

elif state == avahi.ENTRY_GROUP_FAILURE:

461

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

462

str(error))

463

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

464

465

def cleanup(self):

466

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

467

if self.group is not None:

468

try:

469

self.group.Free()

470

except (dbus.exceptions.UnknownMethodException,

471

dbus.exceptions.DBusException):

472

pass

473

self.group = None

474

self.remove()

475

476

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

477

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

478

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

479

bad_states = {

480

avahi.SERVER_INVALID: "Zeroconf server invalid",

481

avahi.SERVER_REGISTERING: None,

482

avahi.SERVER_COLLISION: "Zeroconf server name collision",

483

avahi.SERVER_FAILURE: "Zeroconf server failure",

484

}

485

if state in bad_states:

486

if bad_states[state] is not None:

487

if error is None:

488

logger.error(bad_states[state])

489

else:

490

logger.error(bad_states[state] + ": %r", error)

491

self.cleanup()

492

elif state == avahi.SERVER_RUNNING:

493

try:

494

self.add()

495

except dbus.exceptions.DBusException as error:

496

if (error.get_dbus_name()

497

== "org.freedesktop.Avahi.CollisionError"):

498

logger.info("Local Zeroconf service name"

499

" collision.")

500

return self.rename(remove=False)

501

else:

502

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

503

self.cleanup()

504

os._exit(1)

505

else:

506

if error is None:

507

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

508

else:

509

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

510

511

def activate(self):

512

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

513

if self.server is None:

514

self.server = dbus.Interface(

515

self.bus.get_object(avahi.DBUS_NAME,

516

avahi.DBUS_PATH_SERVER,

517

follow_name_owner_changes=True),

518

avahi.DBUS_INTERFACE_SERVER)

519

self.server.connect_to_signal("StateChanged",

520

self.server_state_changed)

521

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

522

523

524

class AvahiServiceToSyslog(AvahiService):

525

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

526

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

527

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

528

syslogger.setFormatter(logging.Formatter(

529

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

530

.format(self.name)))

531

return ret

532

533

534

# Pretend that we have a GnuTLS module

535

class gnutls:

536

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

537

538

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

539

if library is None:

540

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

541

_library = ctypes.cdll.LoadLibrary(library)

542

del library

543

544

# Unless otherwise indicated, the constants and types below are

545

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

546

547

# Constants

548

E_SUCCESS = 0

549

E_INTERRUPTED = -52

550

E_AGAIN = -28

551

CRT_OPENPGP = 2

552

CRT_RAWPK = 3

553

CLIENT = 2

554

SHUT_RDWR = 0

555

CRD_CERTIFICATE = 1

556

E_NO_CERTIFICATE_FOUND = -49

557

X509_FMT_DER = 0

558

NO_TICKETS = 1<<10

559

ENABLE_RAWPK = 1<<18

560

CTYPE_PEERS = 3

561

KEYID_USE_SHA256 = 1 # gnutls/x509.h

562

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

563

564

# Types

565

class session_int(ctypes.Structure):

566

_fields_ = []

567

session_t = ctypes.POINTER(session_int)

568

569

class certificate_credentials_st(ctypes.Structure):

570

_fields_ = []

571

certificate_credentials_t = ctypes.POINTER(

572

certificate_credentials_st)

573

certificate_type_t = ctypes.c_int

574

575

class datum_t(ctypes.Structure):

576

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

577

('size', ctypes.c_uint)]

578

579

class openpgp_crt_int(ctypes.Structure):

580

_fields_ = []

581

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

582

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

583

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

584

credentials_type_t = ctypes.c_int

585

transport_ptr_t = ctypes.c_void_p

586

close_request_t = ctypes.c_int

587

588

# Exceptions

589

class Error(Exception):

590

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

591

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

592

# code is passed, convert it to a string with

593

# gnutls.strerror()

594

self.code = code

595

if message is None and code is not None:

596

message = gnutls.strerror(code)

597

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

598

message, *args)

599

600

class CertificateSecurityError(Error):

601

pass

602

603

# Classes

604

class Credentials:

605

def __init__(self):

606

self._c_object = gnutls.certificate_credentials_t()

607

gnutls.certificate_allocate_credentials(

608

ctypes.byref(self._c_object))

609

self.type = gnutls.CRD_CERTIFICATE

610

611

def __del__(self):

612

gnutls.certificate_free_credentials(self._c_object)

613

614

class ClientSession:

615

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

616

self._c_object = gnutls.session_t()

617

gnutls_flags = gnutls.CLIENT

618

if gnutls.check_version(b"3.5.6"):

619

gnutls_flags |= gnutls.NO_TICKETS

620

if gnutls.has_rawpk:

621

gnutls_flags |= gnutls.ENABLE_RAWPK

622

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

623

del gnutls_flags

624

gnutls.set_default_priority(self._c_object)

625

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

626

gnutls.handshake_set_private_extensions(self._c_object,

627

True)

628

self.socket = socket

629

if credentials is None:

630

credentials = gnutls.Credentials()

631

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

632

ctypes.cast(credentials._c_object,

633

ctypes.c_void_p))

634

self.credentials = credentials

635

636

def __del__(self):

637

gnutls.deinit(self._c_object)

638

639

def handshake(self):

640

return gnutls.handshake(self._c_object)

641

642

def send(self, data):

643

data = bytes(data)

644

data_len = len(data)

645

while data_len > 0:

646

data_len -= gnutls.record_send(self._c_object,

647

data[-data_len:],

648

data_len)

649

650

def bye(self):

651

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

652

653

# Error handling functions

654

def _error_code(result):

655

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

656

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

657

if result >= 0:

658

return result

659

if result == gnutls.E_NO_CERTIFICATE_FOUND:

660

raise gnutls.CertificateSecurityError(code=result)

661

raise gnutls.Error(code=result)

662

663

def _retry_on_error(result, func, arguments):

664

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

665

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

666

while result < 0:

667

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

668

return _error_code(result)

669

result = func(*arguments)

670

return result

671

672

# Unless otherwise indicated, the function declarations below are

673

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

674

675

# Functions

676

priority_set_direct = _library.gnutls_priority_set_direct

677

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

678

ctypes.POINTER(ctypes.c_char_p)]

679

priority_set_direct.restype = _error_code

680

681

init = _library.gnutls_init

682

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

683

init.restype = _error_code

684

685

set_default_priority = _library.gnutls_set_default_priority

686

set_default_priority.argtypes = [session_t]

687

set_default_priority.restype = _error_code

688

689

record_send = _library.gnutls_record_send

690

record_send.argtypes = [session_t, ctypes.c_void_p,

691

ctypes.c_size_t]

692

record_send.restype = ctypes.c_ssize_t

693

record_send.errcheck = _retry_on_error

694

695

certificate_allocate_credentials = (

696

_library.gnutls_certificate_allocate_credentials)

697

certificate_allocate_credentials.argtypes = [

698

ctypes.POINTER(certificate_credentials_t)]

699

certificate_allocate_credentials.restype = _error_code

700

701

certificate_free_credentials = (

702

_library.gnutls_certificate_free_credentials)

703

certificate_free_credentials.argtypes = [

704

certificate_credentials_t]

705

certificate_free_credentials.restype = None

706

707

handshake_set_private_extensions = (

708

_library.gnutls_handshake_set_private_extensions)

709

handshake_set_private_extensions.argtypes = [session_t,

710

ctypes.c_int]

711

handshake_set_private_extensions.restype = None

712

713

credentials_set = _library.gnutls_credentials_set

714

credentials_set.argtypes = [session_t, credentials_type_t,

715

ctypes.c_void_p]

716

credentials_set.restype = _error_code

717

718

strerror = _library.gnutls_strerror

719

strerror.argtypes = [ctypes.c_int]

720

strerror.restype = ctypes.c_char_p

721

722

certificate_type_get = _library.gnutls_certificate_type_get

723

certificate_type_get.argtypes = [session_t]

724

certificate_type_get.restype = _error_code

725

726

certificate_get_peers = _library.gnutls_certificate_get_peers

727

certificate_get_peers.argtypes = [session_t,

728

ctypes.POINTER(ctypes.c_uint)]

729

certificate_get_peers.restype = ctypes.POINTER(datum_t)

730

731

global_set_log_level = _library.gnutls_global_set_log_level

732

global_set_log_level.argtypes = [ctypes.c_int]

733

global_set_log_level.restype = None

734

735

global_set_log_function = _library.gnutls_global_set_log_function

736

global_set_log_function.argtypes = [log_func]

737

global_set_log_function.restype = None

738

739

deinit = _library.gnutls_deinit

740

deinit.argtypes = [session_t]

741

deinit.restype = None

742

743

handshake = _library.gnutls_handshake

744

handshake.argtypes = [session_t]

745

handshake.restype = _error_code

746

handshake.errcheck = _retry_on_error

747

748

transport_set_ptr = _library.gnutls_transport_set_ptr

749

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

750

transport_set_ptr.restype = None

751

752

bye = _library.gnutls_bye

753

bye.argtypes = [session_t, close_request_t]

754

bye.restype = _error_code

755

bye.errcheck = _retry_on_error

756

757

check_version = _library.gnutls_check_version

758

check_version.argtypes = [ctypes.c_char_p]

759

check_version.restype = ctypes.c_char_p

760

761

_need_version = b"3.3.0"

762

if check_version(_need_version) is None:

763

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

764

.format(_need_version))

765

766

_tls_rawpk_version = b"3.6.6"

767

has_rawpk = bool(check_version(_tls_rawpk_version))

768

769

if has_rawpk:

770

# Types

771

class pubkey_st(ctypes.Structure):

772

_fields = []

773

pubkey_t = ctypes.POINTER(pubkey_st)

774

775

x509_crt_fmt_t = ctypes.c_int

776

777

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

778

pubkey_init = _library.gnutls_pubkey_init

779

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

780

pubkey_init.restype = _error_code

781

782

pubkey_import = _library.gnutls_pubkey_import

783

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

784

x509_crt_fmt_t]

785

pubkey_import.restype = _error_code

786

787

pubkey_get_key_id = _library.gnutls_pubkey_get_key_id

788

pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,

789

ctypes.POINTER(ctypes.c_ubyte),

790

ctypes.POINTER(ctypes.c_size_t)]

791

pubkey_get_key_id.restype = _error_code

792

793

pubkey_deinit = _library.gnutls_pubkey_deinit

794

pubkey_deinit.argtypes = [pubkey_t]

795

pubkey_deinit.restype = None

796

else:

797

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

798

799

openpgp_crt_init = _library.gnutls_openpgp_crt_init

800

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

801

openpgp_crt_init.restype = _error_code

802

803

openpgp_crt_import = _library.gnutls_openpgp_crt_import

804

openpgp_crt_import.argtypes = [openpgp_crt_t,

805

ctypes.POINTER(datum_t),

806

openpgp_crt_fmt_t]

807

openpgp_crt_import.restype = _error_code

808

809

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

810

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

811

ctypes.POINTER(ctypes.c_uint)]

812

openpgp_crt_verify_self.restype = _error_code

813

814

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

815

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

816

openpgp_crt_deinit.restype = None

817

818

openpgp_crt_get_fingerprint = (

819

_library.gnutls_openpgp_crt_get_fingerprint)

820

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

821

ctypes.c_void_p,

822

ctypes.POINTER(

823

ctypes.c_size_t)]

824

openpgp_crt_get_fingerprint.restype = _error_code

825

826

if check_version(b"3.6.4"):

827

certificate_type_get2 = _library.gnutls_certificate_type_get2

828

certificate_type_get2.argtypes = [session_t, ctypes.c_int]

829

certificate_type_get2.restype = _error_code

830

831

# Remove non-public functions

832

del _error_code, _retry_on_error

833

834

835

def call_pipe(connection, # : multiprocessing.Connection

836

func, *args, **kwargs):

837

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

838

839

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

840

return value on the provided multiprocessing.Connection.

841

"""

842

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

843

connection.close()

844

845

846

class Client:

847

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

848

849

Attributes:

850

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

851

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

852

approval_duration: datetime.timedelta(); Duration of one approval

853

checker: multiprocessing.Process(); a running checker process used

854

to see if the client lives. 'None' if no process is

855

running.

856

checker_callback_tag: a GLib event source tag, or None

857

checker_command: string; External command which is run to check

858

if client lives. %() expansions are done at

859

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

860

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

861

checker_initiator_tag: a GLib event source tag, or None

862

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

863

client_structure: Object describing what attributes a client has

864

and is used for storing the client at exit

865

current_checker_command: string; current running checker_command

866

disable_initiator_tag: a GLib event source tag, or None

867

enabled: bool()

868

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

869

uniquely identify an OpenPGP client

870

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

871

a client using raw public keys

872

host: string; available for use by the checker command

873

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

874

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

875

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

876

last_checker_status: integer between 0 and 255 reflecting exit

877

status of last checker. -1 reflects crashed

878

checker, -2 means no checker completed yet.

879

last_checker_signal: The signal which killed the last checker, if

880

last_checker_status is -1

881

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

882

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

883

D-Bus identifiers

884

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

885

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

886

until this client is disabled

887

extended_timeout: extra long timeout when secret has been sent

888

runtime_expansions: Allowed attributes for runtime expansion.

889

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

890

disabled, or None

891

server_settings: The server_settings dict from main()

892

"""

893

894

runtime_expansions = ("approval_delay", "approval_duration",

895

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

896

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

897

"last_approval_request", "last_checked_ok",

898

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

899

client_defaults = {

900

"timeout": "PT5M",

901

"extended_timeout": "PT15M",

902

"interval": "PT2M",

903

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

904

"host": "",

905

"approval_delay": "PT0S",

906

"approval_duration": "PT1S",

907

"approved_by_default": "True",

908

"enabled": "True",

909

}

910

911

@staticmethod

912

def config_parser(config):

913

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

914

{ client_name: {setting_name: value, ...}, ...}

915

with exceptions for any special settings as defined above.

916

NOTE: Must be a pure function. Must return the same result

917

value given the same arguments.

918

"""

919

settings = {}

920

for client_name in config.sections():

921

section = dict(config.items(client_name))

922

client = settings[client_name] = {}

923

924

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

925

# Reformat values from string types to Python types

926

client["approved_by_default"] = config.getboolean(

927

client_name, "approved_by_default")

928

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

929

"enabled")

930

931

# Uppercase and remove spaces from key_id and fingerprint

932

# for later comparison purposes with return value from the

933

# key_id() and fingerprint() functions

934

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

935

.replace(" ", ""))

936

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

937

.replace(" ", ""))

938

if "secret" in section:

939

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

940

.encode("utf-8"),

941

"base64")

942

elif "secfile" in section:

943

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

944

(section["secfile"])),

945

"rb") as secfile:

946

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

947

else:

948

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

949

.format(section))

950

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

951

client["extended_timeout"] = string_to_delta(

952

section["extended_timeout"])

953

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

954

client["approval_delay"] = string_to_delta(

955

section["approval_delay"])

956

client["approval_duration"] = string_to_delta(

957

section["approval_duration"])

958

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

959

client["last_approval_request"] = None

960

client["last_checked_ok"] = None

961

client["last_checker_status"] = -2

962

963

return settings

964

965

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

966

self.name = name

967

if server_settings is None:

968

server_settings = {}

969

self.server_settings = server_settings

970

# adding all client settings

971

for setting, value in settings.items():

972

setattr(self, setting, value)

973

974

if self.enabled:

975

if not hasattr(self, "last_enabled"):

976

self.last_enabled = datetime.datetime.utcnow()

977

if not hasattr(self, "expires"):

978

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

979

+ self.timeout)

980

else:

981

self.last_enabled = None

982

self.expires = None

983

984

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

985

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

986

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

987

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

988

datetime.datetime.utcnow())

989

990

# attributes specific for this server instance

991

self.checker = None

992

self.checker_initiator_tag = None

993

self.disable_initiator_tag = None

994

self.checker_callback_tag = None

995

self.current_checker_command = None

996

self.approved = None

997

self.approvals_pending = 0

998

self.changedstate = multiprocessing_manager.Condition(

999

multiprocessing_manager.Lock())

1000

self.client_structure = [attr

1001

for attr in self.__dict__.keys()

1002

if not attr.startswith("_")]

1003

self.client_structure.append("client_structure")

1004

1005

for name, t in inspect.getmembers(

1006

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

1007

if not name.startswith("_"):

1008

self.client_structure.append(name)

1009

1010

# Send notice to process children that client state has changed

1011

def send_changedstate(self):

1012

with self.changedstate:

1013

self.changedstate.notify_all()

1014

1015

def enable(self):

1016

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

1017

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

1018

# Already enabled

1019

return

1020

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

1021

self.enabled = True

1022

self.last_enabled = datetime.datetime.utcnow()

1023

self.init_checker()

1024

self.send_changedstate()

1025

1026

def disable(self, quiet=True):

1027

"""Disable this client."""

1028

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

1029

return False

1030

if not quiet:

1031

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

1032

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

1033

GLib.source_remove(self.disable_initiator_tag)

1034

self.disable_initiator_tag = None

1035

self.expires = None

1036

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

1037

GLib.source_remove(self.checker_initiator_tag)

1038

self.checker_initiator_tag = None

1039

self.stop_checker()

1040

self.enabled = False

1041

if not quiet:

1042

self.send_changedstate()

1043

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

1044

return False

1045

1046

def __del__(self):

1047

self.disable()

1048

1049

def init_checker(self):

1050

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

1051

# and every interval from then on.

1052

if self.checker_initiator_tag is not None:

1053

GLib.source_remove(self.checker_initiator_tag)

1054

self.checker_initiator_tag = GLib.timeout_add(

1055

random.randrange(int(self.interval.total_seconds() * 1000

1056

+ 1)),

1057

self.start_checker)

1058

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

1059

if self.disable_initiator_tag is not None:

1060

GLib.source_remove(self.disable_initiator_tag)

1061

self.disable_initiator_tag = GLib.timeout_add(

1062

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

1063

# Also start a new checker *right now*.

1064

self.start_checker()

1065

1066

def checker_callback(self, source, condition, connection,

1067

command):

1068

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

1069

# Read return code from connection (see call_pipe)

1070

returncode = connection.recv()

1071

connection.close()

1072

if self.checker is not None:

1073

self.checker.join()

1074

self.checker_callback_tag = None

1075

self.checker = None

1076

1077

if returncode >= 0:

1078

self.last_checker_status = returncode

1079

self.last_checker_signal = None

1080

if self.last_checker_status == 0:

1081

logger.info("Checker for %(name)s succeeded",

1082

vars(self))

1083

self.checked_ok()

1084

else:

1085

logger.info("Checker for %(name)s failed", vars(self))

1086

else:

1087

self.last_checker_status = -1

1088

self.last_checker_signal = -returncode

1089

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

1090

vars(self))

1091

return False

1092

1093

def checked_ok(self):

1094

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

1095

self.last_checked_ok = datetime.datetime.utcnow()

1096

self.last_checker_status = 0

1097

self.last_checker_signal = None

1098

self.bump_timeout()

1099

1100

def bump_timeout(self, timeout=None):

1101

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

14

15

16

class Client(object):

17

def __init__(self, name=None, options=None, dn=None,

18

password=None, passfile=None, fqdn=None,

19

timeout=None, interval=-1):

20

self.name = name

21

self.dn = dn

22

if password:

23

self.password = password

24

elif passfile:

25

self.password = open(passfile).readall()

26

else:

27

print "No Password or Passfile in client config file"

28

# raise RuntimeError XXX

29

self.password = "gazonk"

30

self.fqdn = fqdn

31

self.created = datetime.datetime.now()

32

self.last_seen = None

1102

33

if timeout is None:

1103

timeout = self.timeout

1104

if self.disable_initiator_tag is not None:

1105

GLib.source_remove(self.disable_initiator_tag)

1106

self.disable_initiator_tag = None

1107

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

1108

self.disable_initiator_tag = GLib.timeout_add(

1109

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

1110

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

1111

1112

def need_approval(self):

1113

self.last_approval_request = datetime.datetime.utcnow()

1114

1115

def start_checker(self):

1116

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

1117

1118

If a checker already exists, leave it running and do

1119

nothing."""

1120

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

1121

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

1122

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

1123

# would inevitably timeout, since no checker would get a

1124

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

1125

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

1126

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

1127

# should be.

1128

1129

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

1130

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

1131

self.checker.join()

1132

self.checker = None

1133

# Start a new checker if needed

1134

if self.checker is None:

1135

# Escape attributes for the shell

1136

escaped_attrs = {

1137

attr: shlex.quote(str(getattr(self, attr)))

1138

for attr in self.runtime_expansions}

1139

try:

1140

command = self.checker_command % escaped_attrs

1141

except TypeError as error:

1142

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

1143

self.checker_command,

1144

exc_info=error)

1145

return True # Try again later

1146

self.current_checker_command = command

1147

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

1148

self.name)

1149

# We don't need to redirect stdout and stderr, since

1150

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

1151

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

1152

# always replaced by /dev/null.)

1153

# The exception is when not debugging but nevertheless

1154

# running in the foreground; use the previously

1155

# created wnull.

1156

popen_args = {"close_fds": True,

1157

"shell": True,

1158

"cwd": "/"}

1159

if (not self.server_settings["debug"]

1160

and self.server_settings["foreground"]):

1161

popen_args.update({"stdout": wnull,

1162

"stderr": wnull})

1163

pipe = multiprocessing.Pipe(duplex=False)

1164

self.checker = multiprocessing.Process(

1165

target=call_pipe,

1166

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

1167

kwargs=popen_args)

1168

self.checker.start()

1169

self.checker_callback_tag = GLib.io_add_watch(

1170

GLib.IOChannel.unix_new(pipe[0].fileno()),

1171

GLib.PRIORITY_DEFAULT, GLib.IO_IN,

1172

self.checker_callback, pipe[0], command)

1173

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

1174

return True

1175

1176

def stop_checker(self):

1177

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

1178

if self.checker_callback_tag:

1179

GLib.source_remove(self.checker_callback_tag)

1180

self.checker_callback_tag = None

1181

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

1182

return

1183

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

1184

self.checker.terminate()

1185

self.checker = None

1186

1187

1188

def dbus_service_property(dbus_interface,

1189

signature="v",

1190

access="readwrite",

1191

byte_arrays=False):

1192

"""Decorators for marking methods of a DBusObjectWithProperties to

1193

become properties on the D-Bus.

1194

1195

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

1196

and with one argument by "Set".

1197

1198

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

1199

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

1200

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

1201

"""

1202

# Encoding deeply encoded byte arrays is not supported yet by the

1203

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

1204

if byte_arrays and signature != "ay":

1205

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

1206

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

1207

1208

def decorator(func):

1209

func._dbus_is_property = True

1210

func._dbus_interface = dbus_interface

1211

func._dbus_signature = signature

1212

func._dbus_access = access

1213

func._dbus_name = func.__name__

1214

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

1215

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

1216

func._dbus_get_args_options = {'byte_arrays': byte_arrays}

1217

return func

1218

1219

return decorator

1220

1221

1222

def dbus_interface_annotations(dbus_interface):

1223

"""Decorator for marking functions returning interface annotations

1224

1225

Usage:

1226

1227

@dbus_interface_annotations("org.example.Interface")

1228

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

1229

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

1230

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

1231

"false"}

1232

"""

1233

1234

def decorator(func):

1235

func._dbus_is_interface = True

1236

func._dbus_interface = dbus_interface

1237

func._dbus_name = dbus_interface

1238

return func

1239

1240

return decorator

1241

1242

1243

def dbus_annotations(annotations):

1244

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

1245

Usage:

1246

1247

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

1248

"org.freedesktop.DBus.Property."

1249

"EmitsChangedSignal": "false"})

1250

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

1251

access="r")

1252

def Property_dbus_property(self):

1253

return dbus.Boolean(False)

1254

1255

See also the DBusObjectWithAnnotations class.

1256

"""

1257

1258

def decorator(func):

1259

func._dbus_annotations = annotations

1260

return func

1261

1262

return decorator

1263

1264

1265

class DBusPropertyException(dbus.exceptions.DBusException):

1266

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

1267

"""

1268

pass

1269

1270

1271

class DBusPropertyAccessException(DBusPropertyException):

1272

"""A property's access permissions disallows an operation.

1273

"""

1274

pass

1275

1276

1277

class DBusPropertyNotFound(DBusPropertyException):

1278

"""An attempt was made to access a non-existing property.

1279

"""

1280

pass

1281

1282

1283

class DBusObjectWithAnnotations(dbus.service.Object):

1284

"""A D-Bus object with annotations.

1285

1286

Classes inheriting from this can use the dbus_annotations

1287

decorator to add annotations to methods or signals.

1288

"""

1289

1290

@staticmethod

1291

def _is_dbus_thing(thing):

1292

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

1293

1294

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

1295

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

1296

"""

1297

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

1298

False)

1299

1300

def _get_all_dbus_things(self, thing):

1301

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

1302

"""

1303

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

1304

athing.__get__(self))

1305

for cls in self.__class__.__mro__

1306

for name, athing in

1307

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

1308

1309

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1310

out_signature="s",

1311

path_keyword='object_path',

1312

connection_keyword='connection')

1313

def Introspect(self, object_path, connection):

1314

"""Overloading of standard D-Bus method.

1315

1316

Inserts annotation tags on methods and signals.

1317

"""

1318

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

1319

connection)

1320

try:

1321

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

1322

1323

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

1324

# Add annotation tags

1325

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

1326

for tag in if_tag.getElementsByTagName(typ):

1327

annots = dict()

1328

for name, prop in (self.

1329

_get_all_dbus_things(typ)):

1330

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

1331

and prop._dbus_interface

1332

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

1333

annots.update(getattr(

1334

prop, "_dbus_annotations", {}))

1335

for name, value in annots.items():

1336

ann_tag = document.createElement(

1337

"annotation")

1338

ann_tag.setAttribute("name", name)

1339

ann_tag.setAttribute("value", value)

1340

tag.appendChild(ann_tag)

1341

# Add interface annotation tags

1342

for annotation, value in dict(

1343

itertools.chain.from_iterable(

1344

annotations().items()

1345

for name, annotations

1346

in self._get_all_dbus_things("interface")

1347

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

1348

)).items():

1349

ann_tag = document.createElement("annotation")

1350

ann_tag.setAttribute("name", annotation)

1351

ann_tag.setAttribute("value", value)

1352

if_tag.appendChild(ann_tag)

1353

# Fix argument name for the Introspect method itself

1354

if (if_tag.getAttribute("name")

1355

== dbus.INTROSPECTABLE_IFACE):

1356

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

1357

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

1358

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

1359

if (arg.getAttribute("direction")

1360

== "out"):

1361

arg.setAttribute("name",

1362

"xml_data")

1363

xmlstring = document.toxml("utf-8")

1364

document.unlink()

1365

except (AttributeError, xml.dom.DOMException,

1366

xml.parsers.expat.ExpatError) as error:

1367

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

1368

exc_info=error)

1369

return xmlstring

1370

1371

1372

class DBusObjectWithProperties(DBusObjectWithAnnotations):

1373

"""A D-Bus object with properties.

1374

1375

Classes inheriting from this can use the dbus_service_property

1376

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

1377

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

1378

"""

1379

1380

def _get_dbus_property(self, interface_name, property_name):

1381

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

1382

property with the specified name and interface.

1383

"""

1384

for cls in self.__class__.__mro__:

1385

for name, value in inspect.getmembers(

1386

cls, self._is_dbus_thing("property")):

1387

if (value._dbus_name == property_name

1388

and value._dbus_interface == interface_name):

1389

return value.__get__(self)

1390

1391

# No such property

1392

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

1393

self.dbus_object_path, interface_name, property_name))

1394

1395

@classmethod

1396

def _get_all_interface_names(cls):

1397

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

1398

return (name for name in set(getattr(getattr(x, attr),

1399

"_dbus_interface", None)

1400

for x in (inspect.getmro(cls))

1401

for attr in dir(x))

1402

if name is not None)

1403

1404

@dbus.service.method(dbus.PROPERTIES_IFACE,

1405

in_signature="ss",

1406

out_signature="v")

1407

def Get(self, interface_name, property_name):

1408

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

1409

"""

1410

prop = self._get_dbus_property(interface_name, property_name)

1411

if prop._dbus_access == "write":

1412

raise DBusPropertyAccessException(property_name)

1413

value = prop()

1414

if not hasattr(value, "variant_level"):

1415

return value

1416

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

1417

1418

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

1419

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

1420

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

1421

"""

1422

prop = self._get_dbus_property(interface_name, property_name)

1423

if prop._dbus_access == "read":

1424

raise DBusPropertyAccessException(property_name)

1425

if prop._dbus_get_args_options["byte_arrays"]:

1426

# The byte_arrays option is not supported yet on

1427

# signatures other than "ay".

1428

if prop._dbus_signature != "ay":

1429

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

1430

"'ay' signature {!r}"

1431

.format(prop._dbus_signature))

1432

value = dbus.ByteArray(bytes(value))

1433

prop(value)

1434

1435

@dbus.service.method(dbus.PROPERTIES_IFACE,

1436

in_signature="s",

1437

out_signature="a{sv}")

1438

def GetAll(self, interface_name):

1439

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

1440

standard.

1441

1442

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

1443

"""

1444

properties = {}

1445

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

1446

if (interface_name

1447

and interface_name != prop._dbus_interface):

1448

# Interface non-empty but did not match

1449

continue

1450

# Ignore write-only properties

1451

if prop._dbus_access == "write":

1452

continue

1453

value = prop()

1454

if not hasattr(value, "variant_level"):

1455

properties[name] = value

1456

continue

1457

properties[name] = type(value)(

1458

value, variant_level=value.variant_level + 1)

1459

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

1460

1461

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

1462

def PropertiesChanged(self, interface_name, changed_properties,

1463

invalidated_properties):

1464

"""Standard D-Bus PropertiesChanged() signal, see D-Bus

1465

standard.

1466

"""

1467

pass

1468

1469

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1470

out_signature="s",

1471

path_keyword='object_path',

1472

connection_keyword='connection')

1473

def Introspect(self, object_path, connection):

1474

"""Overloading of standard D-Bus method.

1475

1476

Inserts property tags and interface annotation tags.

1477

"""

1478

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1479

object_path,

1480

connection)

1481

try:

1482

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

1483

1484

def make_tag(document, name, prop):

1485

e = document.createElement("property")

1486

e.setAttribute("name", name)

1487

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

1488

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

1489

return e

1490

1491

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

1492

# Add property tags

1493

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

1494

for name, prop

1495

in self._get_all_dbus_things("property")

1496

if prop._dbus_interface

1497

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

1498

if_tag.appendChild(tag)

1499

# Add annotation tags for properties

1500

for tag in if_tag.getElementsByTagName("property"):

1501

annots = dict()

1502

for name, prop in self._get_all_dbus_things(

1503

"property"):

1504

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

1505

and prop._dbus_interface

1506

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

1507

annots.update(getattr(

1508

prop, "_dbus_annotations", {}))

1509

for name, value in annots.items():

1510

ann_tag = document.createElement(

1511

"annotation")

1512

ann_tag.setAttribute("name", name)

1513

ann_tag.setAttribute("value", value)

1514

tag.appendChild(ann_tag)

1515

# Add the names to the return values for the

1516

# "org.freedesktop.DBus.Properties" methods

1517

if (if_tag.getAttribute("name")

1518

== "org.freedesktop.DBus.Properties"):

1519

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

1520

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

1521

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

1522

if (arg.getAttribute("direction")

1523

== "out"):

1524

arg.setAttribute("name", "value")

1525

elif cn.getAttribute("name") == "GetAll":

1526

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

1527

if (arg.getAttribute("direction")

1528

== "out"):

1529

arg.setAttribute("name", "props")

1530

xmlstring = document.toxml("utf-8")

1531

document.unlink()

1532

except (AttributeError, xml.dom.DOMException,

1533

xml.parsers.expat.ExpatError) as error:

1534

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

1535

exc_info=error)

1536

return xmlstring

1537

1538

1539

try:

1540

dbus.OBJECT_MANAGER_IFACE

1541

except AttributeError:

1542

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

1543

1544

1545

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1546

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

1547

1548

Classes inheriting from this exposes the standard

1549

GetManagedObjects call and the InterfacesAdded and

1550

InterfacesRemoved signals on the standard

1551

"org.freedesktop.DBus.ObjectManager" interface.

1552

1553

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

1554

manually.

1555

"""

1556

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1557

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

1558

def GetManagedObjects(self):

1559

"""This function must be overridden"""

1560

raise NotImplementedError()

1561

1562

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1563

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

1564

def InterfacesAdded(self, object_path, interfaces_and_properties):

1565

pass

1566

1567

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

1568

def InterfacesRemoved(self, object_path, interfaces):

1569

pass

1570

1571

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1572

out_signature="s",

1573

path_keyword='object_path',

1574

connection_keyword='connection')

1575

def Introspect(self, object_path, connection):

1576

"""Overloading of standard D-Bus method.

1577

1578

Override return argument name of GetManagedObjects to be

1579

"objpath_interfaces_and_properties"

1580

"""

1581

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1582

object_path,

1583

connection)

1584

try:

1585

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

1586

1587

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

1588

# Fix argument name for the GetManagedObjects method

1589

if (if_tag.getAttribute("name")

1590

== dbus.OBJECT_MANAGER_IFACE):

1591

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

1592

if (cn.getAttribute("name")

1593

== "GetManagedObjects"):

1594

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

1595

if (arg.getAttribute("direction")

1596

== "out"):

1597

arg.setAttribute(

1598

"name",

1599

"objpath_interfaces"

1600

"_and_properties")

1601

xmlstring = document.toxml("utf-8")

1602

document.unlink()

1603

except (AttributeError, xml.dom.DOMException,

1604

xml.parsers.expat.ExpatError) as error:

1605

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

1606

exc_info=error)

1607

return xmlstring

1608

1609

1610

def datetime_to_dbus(dt, variant_level=0):

1611

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

1612

if dt is None:

1613

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

1614

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

1615

1616

1617

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1618

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

1619

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

1620

interface names according to the "alt_interface_names" mapping.

1621

Usage:

1622

1623

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

1624

"net.example.AlternateInterface"})

1625

class SampleDBusObject(dbus.service.Object):

1626

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

1627

def SampleDBusMethod():

1628

pass

1629

1630

The above "SampleDBusMethod" on "SampleDBusObject" will be

1631

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

1632

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

1633

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

1634

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

1635

1636

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

1637

(from DBusObjectWithProperties) and interfaces (from the

1638

dbus_interface_annotations decorator).

1639

"""

1640

1641

def wrapper(cls):

1642

for orig_interface_name, alt_interface_name in (

1643

alt_interface_names.items()):

1644

attr = {}

1645

interface_names = set()

1646

# Go though all attributes of the class

1647

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

1648

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

1649

# with the wrong interface name

1650

if (not hasattr(attribute, "_dbus_interface")

1651

or not attribute._dbus_interface.startswith(

1652

orig_interface_name)):

1653

continue

1654

# Create an alternate D-Bus interface name based on

1655

# the current name

1656

alt_interface = attribute._dbus_interface.replace(

1657

orig_interface_name, alt_interface_name)

1658

interface_names.add(alt_interface)

1659

# Is this a D-Bus signal?

1660

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

1661

# Extract the original non-method undecorated

1662

# function by black magic

1663

if sys.version_info.major == 2:

1664

nonmethod_func = (dict(

1665

zip(attribute.func_code.co_freevars,

1666

attribute.__closure__))

1667

["func"].cell_contents)

1668

else:

1669

nonmethod_func = (dict(

1670

zip(attribute.__code__.co_freevars,

1671

attribute.__closure__))

1672

["func"].cell_contents)

1673

# Create a new, but exactly alike, function

1674

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

1675

# with the alternate D-Bus interface name

1676

new_function = copy_function(nonmethod_func)

1677

new_function = (dbus.service.signal(

1678

alt_interface,

1679

attribute._dbus_signature)(new_function))

1680

# Copy annotations, if any

1681

try:

1682

new_function._dbus_annotations = dict(

1683

attribute._dbus_annotations)

1684

except AttributeError:

1685

pass

1686

1687

# Define a creator of a function to call both the

1688

# original and alternate functions, so both the

1689

# original and alternate signals gets sent when

1690

# the function is called

1691

def fixscope(func1, func2):

1692

"""This function is a scope container to pass

1693

func1 and func2 to the "call_both" function

1694

outside of its arguments"""

1695

1696

@functools.wraps(func2)

1697

def call_both(*args, **kwargs):

1698

"""This function will emit two D-Bus

1699

signals by calling func1 and func2"""

1700

func1(*args, **kwargs)

1701

func2(*args, **kwargs)

1702

# Make wrapper function look like a D-Bus

1703

# signal

1704

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

1705

if name.startswith("_dbus_"):

1706

setattr(call_both, name, attr)

1707

1708

return call_both

1709

# Create the "call_both" function and add it to

1710

# the class

1711

attr[attrname] = fixscope(attribute, new_function)

1712

# Is this a D-Bus method?

1713

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

1714

# Create a new, but exactly alike, function

1715

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

1716

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

1717

# to the class.

1718

attr[attrname] = (

1719

dbus.service.method(

1720

alt_interface,

1721

attribute._dbus_in_signature,

1722

attribute._dbus_out_signature)

1723

(copy_function(attribute)))

1724

# Copy annotations, if any

1725

try:

1726

attr[attrname]._dbus_annotations = dict(

1727

attribute._dbus_annotations)

1728

except AttributeError:

1729

pass

1730

# Is this a D-Bus property?

1731

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

1732

# Create a new, but exactly alike, function

1733

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

1734

# property with the alternate D-Bus interface

1735

# name. Add it to the class.

1736

attr[attrname] = (dbus_service_property(

1737

alt_interface, attribute._dbus_signature,

1738

attribute._dbus_access,

1739

attribute._dbus_get_args_options

1740

["byte_arrays"])

1741

(copy_function(attribute)))

1742

# Copy annotations, if any

1743

try:

1744

attr[attrname]._dbus_annotations = dict(

1745

attribute._dbus_annotations)

1746

except AttributeError:

1747

pass

1748

# Is this a D-Bus interface?

1749

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

1750

# Create a new, but exactly alike, function

1751

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

1752

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

1753

# to the class.

1754

attr[attrname] = (

1755

dbus_interface_annotations(alt_interface)

1756

(copy_function(attribute)))

1757

if deprecate:

1758

# Deprecate all alternate interfaces

1759

iname = "_AlternateDBusNames_interface_annotation{}"

1760

for interface_name in interface_names:

1761

1762

@dbus_interface_annotations(interface_name)

1763

def func(self):

1764

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

1765

"true"}

1766

# Find an unused name

1767

for aname in (iname.format(i)

1768

for i in itertools.count()):

1769

if aname not in attr:

1770

attr[aname] = func

1771

break

1772

if interface_names:

1773

# Replace the class with a new subclass of it with

1774

# methods, signals, etc. as created above.

1775

if sys.version_info.major == 2:

1776

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

1777

(cls, ), attr)

1778

else:

1779

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

1780

(cls, ), attr)

1781

return cls

1782

1783

return wrapper

1784

1785

1786

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

1787

"se.bsnet.fukt.Mandos"})

1788

class ClientDBus(Client, DBusObjectWithProperties):

1789

"""A Client class using D-Bus

1790

1791

Attributes:

1792

dbus_object_path: dbus.ObjectPath

1793

bus: dbus.SystemBus()

1794

"""

1795

1796

runtime_expansions = (Client.runtime_expansions

1797

+ ("dbus_object_path", ))

1798

1799

_interface = "se.recompile.Mandos.Client"

1800

1801

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

1802

1803

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

1804

self.bus = bus

1805

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

1806

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

1807

# the D-Bus

1808

client_object_name = str(self.name).translate(

1809

{ord("."): ord("_"),

1810

ord("-"): ord("_")})

1811

self.dbus_object_path = dbus.ObjectPath(

1812

"/clients/" + client_object_name)

1813

DBusObjectWithProperties.__init__(self, self.bus,

1814

self.dbus_object_path)

1815

1816

def notifychangeproperty(transform_func, dbus_name,

1817

type_func=lambda x: x,

1818

variant_level=1,

1819

invalidate_only=False,

1820

_interface=_interface):

1821

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

1822

its changes to DBus.

1823

1824

transform_fun: Function that takes a value and a variant_level

1825

and transforms it to a D-Bus type.

1826

dbus_name: D-Bus name of the variable

1827

type_func: Function that transform the value before sending it

1828

to the D-Bus. Default: no transform

1829

variant_level: D-Bus variant level. Default: 1

1830

"""

1831

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

1832

1833

def setter(self, value):

1834

if hasattr(self, "dbus_object_path"):

1835

if (not hasattr(self, attrname) or

1836

type_func(getattr(self, attrname, None))

1837

!= type_func(value)):

1838

if invalidate_only:

1839

self.PropertiesChanged(

1840

_interface, dbus.Dictionary(),

1841

dbus.Array((dbus_name, )))

1842

else:

1843

dbus_value = transform_func(

1844

type_func(value),

1845

variant_level=variant_level)

1846

self.PropertyChanged(dbus.String(dbus_name),

1847

dbus_value)

1848

self.PropertiesChanged(

1849

_interface,

1850

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

1851

dbus_value}),

1852

dbus.Array())

1853

setattr(self, attrname, value)

1854

1855

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

1856

1857

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1858

approvals_pending = notifychangeproperty(dbus.Boolean,

1859

"ApprovalPending",

1860

type_func=bool)

1861

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

1862

last_enabled = notifychangeproperty(datetime_to_dbus,

1863

"LastEnabled")

1864

checker = notifychangeproperty(

1865

dbus.Boolean, "CheckerRunning",

1866

type_func=lambda checker: checker is not None)

1867

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1868

"LastCheckedOK")

1869

last_checker_status = notifychangeproperty(dbus.Int16,

1870

"LastCheckerStatus")

1871

last_approval_request = notifychangeproperty(

1872

datetime_to_dbus, "LastApprovalRequest")

1873

approved_by_default = notifychangeproperty(dbus.Boolean,

1874

"ApprovedByDefault")

1875

approval_delay = notifychangeproperty(

1876

dbus.UInt64, "ApprovalDelay",

1877

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

1878

approval_duration = notifychangeproperty(

1879

dbus.UInt64, "ApprovalDuration",

1880

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

1881

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

1882

timeout = notifychangeproperty(

1883

dbus.UInt64, "Timeout",

1884

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

1885

extended_timeout = notifychangeproperty(

1886

dbus.UInt64, "ExtendedTimeout",

1887

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

1888

interval = notifychangeproperty(

1889

dbus.UInt64, "Interval",

1890

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

1891

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

1892

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

1893

invalidate_only=True)

1894

1895

del notifychangeproperty

1896

1897

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

1898

try:

1899

self.remove_from_connection()

1900

except LookupError:

1901

pass

1902

if hasattr(DBusObjectWithProperties, "__del__"):

1903

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

1904

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

1905

1906

def checker_callback(self, source, condition,

1907

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

1908

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

1909

connection, command, *args,

1910

**kwargs)

1911

exitstatus = self.last_checker_status

1912

if exitstatus >= 0:

1913

# Emit D-Bus signal

1914

self.CheckerCompleted(dbus.Int16(exitstatus),

1915

# This is specific to GNU libC

1916

dbus.Int64(exitstatus << 8),

1917

dbus.String(command))

1918

else:

1919

# Emit D-Bus signal

1920

self.CheckerCompleted(dbus.Int16(-1),

1921

dbus.Int64(

1922

# This is specific to GNU libC

1923

(exitstatus << 8)

1924

| self.last_checker_signal),

1925

dbus.String(command))

1926

return ret

1927

1928

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

1929

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

1930

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

1931

# Only if new checker process was started

1932

if (self.checker is not None

1933

and old_checker_pid != self.checker.pid):

1934

# Emit D-Bus signal

1935

self.CheckerStarted(self.current_checker_command)

1936

return r

1937

1938

def _reset_approved(self):

1939

self.approved = None

1940

return False

1941

1942

def approve(self, value=True):

1943

self.approved = value

1944

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

1945

* 1000), self._reset_approved)

1946

self.send_changedstate()

1947

1948

# D-Bus methods, signals & properties

1949

1950

# Interfaces

1951

1952

# Signals

1953

1954

# CheckerCompleted - signal

1955

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

1956

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

1957

"D-Bus signal"

1958

pass

1959

1960

# CheckerStarted - signal

1961

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

1962

def CheckerStarted(self, command):

1963

"D-Bus signal"

1964

pass

1965

1966

# PropertyChanged - signal

1967

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

1968

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

1969

def PropertyChanged(self, property, value):

1970

"D-Bus signal"

1971

pass

1972

1973

# GotSecret - signal

1974

@dbus.service.signal(_interface)

1975

def GotSecret(self):

1976

"""D-Bus signal

1977

Is sent after a successful transfer of secret from the Mandos

1978

server to mandos-client

1979

"""

1980

pass

1981

1982

# Rejected - signal

1983

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

1984

def Rejected(self, reason):

1985

"D-Bus signal"

1986

pass

1987

1988

# NeedApproval - signal

1989

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

1990

def NeedApproval(self, timeout, default):

1991

"D-Bus signal"

1992

return self.need_approval()

1993

1994

# Methods

1995

1996

# Approve - method

1997

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

1998

def Approve(self, value):

1999

self.approve(value)

2000

2001

# CheckedOK - method

2002

@dbus.service.method(_interface)

2003

def CheckedOK(self):

2004

self.checked_ok()

2005

2006

# Enable - method

2007

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

2008

@dbus.service.method(_interface)

2009

def Enable(self):

2010

"D-Bus method"

2011

self.enable()

2012

2013

# StartChecker - method

2014

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

2015

@dbus.service.method(_interface)

2016

def StartChecker(self):

2017

"D-Bus method"

2018

self.start_checker()

2019

2020

# Disable - method

2021

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

2022

@dbus.service.method(_interface)

2023

def Disable(self):

2024

"D-Bus method"

2025

self.disable()

2026

2027

# StopChecker - method

2028

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

2029

@dbus.service.method(_interface)

2030

def StopChecker(self):

2031

self.stop_checker()

2032

2033

# Properties

2034

2035

# ApprovalPending - property

2036

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

2037

def ApprovalPending_dbus_property(self):

2038

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

2039

2040

# ApprovedByDefault - property

2041

@dbus_service_property(_interface,

2042

signature="b",

2043

access="readwrite")

2044

def ApprovedByDefault_dbus_property(self, value=None):

2045

if value is None: # get

2046

return dbus.Boolean(self.approved_by_default)

2047

self.approved_by_default = bool(value)

2048

2049

# ApprovalDelay - property

2050

@dbus_service_property(_interface,

2051

signature="t",

2052

access="readwrite")

2053

def ApprovalDelay_dbus_property(self, value=None):

2054

if value is None: # get

2055

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

2056

* 1000)

2057

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

2058

2059

# ApprovalDuration - property

2060

@dbus_service_property(_interface,

2061

signature="t",

2062

access="readwrite")

2063

def ApprovalDuration_dbus_property(self, value=None):

2064

if value is None: # get

2065

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

2066

* 1000)

2067

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

2068

2069

# Name - property

2070

@dbus_annotations(

2071

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

2072

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

2073

def Name_dbus_property(self):

2074

return dbus.String(self.name)

2075

2076

# KeyID - property

2077

@dbus_annotations(

2078

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

2079

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

2080

def KeyID_dbus_property(self):

2081

return dbus.String(self.key_id)

2082

2083

# Fingerprint - property

2084

@dbus_annotations(

2085

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

2086

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

2087

def Fingerprint_dbus_property(self):

2088

return dbus.String(self.fingerprint)

2089

2090

# Host - property

2091

@dbus_service_property(_interface,

2092

signature="s",

2093

access="readwrite")

2094

def Host_dbus_property(self, value=None):

2095

if value is None: # get

2096

return dbus.String(self.host)

2097

self.host = str(value)

2098

2099

# Created - property

2100

@dbus_annotations(

2101

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

2102

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

2103

def Created_dbus_property(self):

2104

return datetime_to_dbus(self.created)

2105

2106

# LastEnabled - property

2107

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

2108

def LastEnabled_dbus_property(self):

2109

return datetime_to_dbus(self.last_enabled)

2110

2111

# Enabled - property

2112

@dbus_service_property(_interface,

2113

signature="b",

2114

access="readwrite")

2115

def Enabled_dbus_property(self, value=None):

2116

if value is None: # get

2117

return dbus.Boolean(self.enabled)

2118

if value:

2119

self.enable()

2120

else:

2121

self.disable()

2122

2123

# LastCheckedOK - property

2124

@dbus_service_property(_interface,

2125

signature="s",

2126

access="readwrite")

2127

def LastCheckedOK_dbus_property(self, value=None):

2128

if value is not None:

2129

self.checked_ok()

2130

return

2131

return datetime_to_dbus(self.last_checked_ok)

2132

2133

# LastCheckerStatus - property

2134

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

2135

def LastCheckerStatus_dbus_property(self):

2136

return dbus.Int16(self.last_checker_status)

2137

2138

# Expires - property

2139

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

2140

def Expires_dbus_property(self):

2141

return datetime_to_dbus(self.expires)

2142

2143

# LastApprovalRequest - property

2144

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

2145

def LastApprovalRequest_dbus_property(self):

2146

return datetime_to_dbus(self.last_approval_request)

2147

2148

# Timeout - property

2149

@dbus_service_property(_interface,

2150

signature="t",

2151

access="readwrite")

2152

def Timeout_dbus_property(self, value=None):

2153

if value is None: # get

2154

return dbus.UInt64(self.timeout.total_seconds() * 1000)

2155

old_timeout = self.timeout

2156

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

2157

# Reschedule disabling

2158

if self.enabled:

2159

now = datetime.datetime.utcnow()

2160

self.expires += self.timeout - old_timeout

2161

if self.expires <= now:

2162

# The timeout has passed

2163

self.disable()

2164

else:

2165

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

2166

is None):

2167

return

2168

GLib.source_remove(self.disable_initiator_tag)

2169

self.disable_initiator_tag = GLib.timeout_add(

2170

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

2171

self.disable)

2172

2173

# ExtendedTimeout - property

2174

@dbus_service_property(_interface,

2175

signature="t",

2176

access="readwrite")

2177

def ExtendedTimeout_dbus_property(self, value=None):

2178

if value is None: # get

2179

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

2180

* 1000)

2181

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

2182

2183

# Interval - property

2184

@dbus_service_property(_interface,

2185

signature="t",

2186

access="readwrite")

2187

def Interval_dbus_property(self, value=None):

2188

if value is None: # get

2189

return dbus.UInt64(self.interval.total_seconds() * 1000)

2190

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

2191

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

2192

return

2193

if self.enabled:

2194

# Reschedule checker run

2195

GLib.source_remove(self.checker_initiator_tag)

2196

self.checker_initiator_tag = GLib.timeout_add(

2197

value, self.start_checker)

2198

self.start_checker() # Start one now, too

2199

2200

# Checker - property

2201

@dbus_service_property(_interface,

2202

signature="s",

2203

access="readwrite")

2204

def Checker_dbus_property(self, value=None):

2205

if value is None: # get

2206

return dbus.String(self.checker_command)

2207

self.checker_command = str(value)

2208

2209

# CheckerRunning - property

2210

@dbus_service_property(_interface,

2211

signature="b",

2212

access="readwrite")

2213

def CheckerRunning_dbus_property(self, value=None):

2214

if value is None: # get

2215

return dbus.Boolean(self.checker is not None)

2216

if value:

2217

self.start_checker()

2218

else:

2219

self.stop_checker()

2220

2221

# ObjectPath - property

2222

@dbus_annotations(

2223

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

2224

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

2225

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

2226

def ObjectPath_dbus_property(self):

2227

return self.dbus_object_path # is already a dbus.ObjectPath

2228

2229

# Secret = property

2230

@dbus_annotations(

2231

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

2232

"invalidates"})

2233

@dbus_service_property(_interface,

2234

signature="ay",

2235

access="write",

2236

byte_arrays=True)

2237

def Secret_dbus_property(self, value):

2238

self.secret = bytes(value)

2239

2240

del _interface

2241

2242

2243

class ProxyClient:

2244

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

2245

self._pipe = child_pipe

2246

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

2247

if not self._pipe.recv():

2248

raise KeyError(key_id or fpr)

2249

2250

def __getattribute__(self, name):

2251

if name == '_pipe':

2252

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

2253

self._pipe.send(('getattr', name))

2254

data = self._pipe.recv()

2255

if data[0] == 'data':

2256

return data[1]

2257

if data[0] == 'function':

2258

2259

def func(*args, **kwargs):

2260

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

2261

return self._pipe.recv()[1]

2262

2263

return func

2264

2265

def __setattr__(self, name, value):

2266

if name == '_pipe':

2267

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

2268

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

2269

2270

2271

class ClientHandler(socketserver.BaseRequestHandler, object):

2272

"""A class to handle client connections.

2273

2274

Instantiated once for each connection to handle it.

2275

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

2276

2277

def handle(self):

2278

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

2279

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

2280

str(self.client_address))

2281

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

2282

self.server.child_pipe.fileno())

2283

2284

session = gnutls.ClientSession(self.request)

2285

2286

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

2287

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

2288

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

2289

# "+DHE-DSS"))

2290

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

2291

priority = self.server.gnutls_priority

2292

if priority is None:

2293

priority = "NORMAL"

2294

gnutls.priority_set_direct(session._c_object,

2295

priority.encode("utf-8"),

2296

None)

2297

2298

# Start communication using the Mandos protocol

2299

# Get protocol number

2300

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

2301

logger.debug("Protocol version: %r", line)

2302

try:

2303

if int(line.strip().split()[0]) > 1:

2304

raise RuntimeError(line)

2305

except (ValueError, IndexError, RuntimeError) as error:

2306

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

2307

return

2308

2309

# Start GnuTLS connection

2310

try:

2311

session.handshake()

2312

except gnutls.Error as error:

2313

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

2314

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

2315

# established. Just abandon the request.

2316

return

2317

logger.debug("Handshake succeeded")

2318

2319

approval_required = False

2320

try:

2321

if gnutls.has_rawpk:

2322

fpr = b""

2323

try:

2324

key_id = self.key_id(

2325

self.peer_certificate(session))

2326

except (TypeError, gnutls.Error) as error:

2327

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

2328

return

2329

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

2330

2331

else:

2332

key_id = b""

2333

try:

2334

fpr = self.fingerprint(

2335

self.peer_certificate(session))

2336

except (TypeError, gnutls.Error) as error:

2337

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

2338

return

2339

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

2340

2341

try:

2342

client = ProxyClient(child_pipe, key_id, fpr,

2343

self.client_address)

2344

except KeyError:

2345

return

2346

2347

if client.approval_delay:

2348

delay = client.approval_delay

2349

client.approvals_pending += 1

2350

approval_required = True

2351

2352

while True:

2353

if not client.enabled:

2354

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

2355

client.name)

2356

if self.server.use_dbus:

2357

# Emit D-Bus signal

2358

client.Rejected("Disabled")

2359

return

2360

2361

if client.approved or not client.approval_delay:

2362

# We are approved or approval is disabled

2363

break

2364

elif client.approved is None:

2365

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

2366

client.name)

2367

if self.server.use_dbus:

2368

# Emit D-Bus signal

2369

client.NeedApproval(

2370

client.approval_delay.total_seconds()

2371

* 1000, client.approved_by_default)

2372

else:

2373

logger.warning("Client %s was not approved",

2374

client.name)

2375

if self.server.use_dbus:

2376

# Emit D-Bus signal

2377

client.Rejected("Denied")

2378

return

2379

2380

# wait until timeout or approved

2381

time = datetime.datetime.now()

2382

client.changedstate.acquire()

2383

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

2384

client.changedstate.release()

2385

time2 = datetime.datetime.now()

2386

if (time2 - time) >= delay:

2387

if not client.approved_by_default:

2388

logger.warning("Client %s timed out while"

2389

" waiting for approval",

2390

client.name)

2391

if self.server.use_dbus:

2392

# Emit D-Bus signal

2393

client.Rejected("Approval timed out")

2394

return

2395

else:

2396

break

2397

else:

2398

delay -= time2 - time

2399

2400

try:

2401

session.send(client.secret)

2402

except gnutls.Error as error:

2403

logger.warning("gnutls send failed",

2404

exc_info=error)

2405

return

2406

2407

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

2408

# bump the timeout using extended_timeout

2409

client.bump_timeout(client.extended_timeout)

2410

if self.server.use_dbus:

2411

# Emit D-Bus signal

2412

client.GotSecret()

2413

2414

finally:

2415

if approval_required:

2416

client.approvals_pending -= 1

2417

try:

2418

session.bye()

2419

except gnutls.Error as error:

2420

logger.warning("GnuTLS bye failed",

2421

exc_info=error)

2422

2423

@staticmethod

2424

def peer_certificate(session):

2425

"Return the peer's certificate as a bytestring"

2426

try:

2427

cert_type = gnutls.certificate_type_get2(session._c_object,

2428

gnutls.CTYPE_PEERS)

2429

except AttributeError:

2430

cert_type = gnutls.certificate_type_get(session._c_object)

2431

if gnutls.has_rawpk:

2432

valid_cert_types = frozenset((gnutls.CRT_RAWPK,))

2433

else:

2434

valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))

2435

# If not a valid certificate type...

2436

if cert_type not in valid_cert_types:

2437

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

2438

valid_cert_types)

2439

# ...return invalid data

2440

return b""

2441

list_size = ctypes.c_uint(1)

2442

cert_list = (gnutls.certificate_get_peers

2443

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

2444

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

2445

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

2446

if list_size.value == 0:

2447

return None

2448

cert = cert_list[0]

2449

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

2450

2451

@staticmethod

2452

def key_id(certificate):

2453

"Convert a certificate bytestring to a hexdigit key ID"

2454

# New GnuTLS "datum" with the public key

2455

datum = gnutls.datum_t(

2456

ctypes.cast(ctypes.c_char_p(certificate),

2457

ctypes.POINTER(ctypes.c_ubyte)),

2458

ctypes.c_uint(len(certificate)))

2459

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

2460

# New empty GnuTLS certificate

2461

pubkey = gnutls.pubkey_t()

2462

gnutls.pubkey_init(ctypes.byref(pubkey))

2463

# Import the raw public key into the certificate

2464

gnutls.pubkey_import(pubkey,

2465

ctypes.byref(datum),

2466

gnutls.X509_FMT_DER)

2467

# New buffer for the key ID

2468

buf = ctypes.create_string_buffer(32)

2469

buf_len = ctypes.c_size_t(len(buf))

2470

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

2471

gnutls.pubkey_get_key_id(pubkey,

2472

gnutls.KEYID_USE_SHA256,

2473

ctypes.cast(ctypes.byref(buf),

2474

ctypes.POINTER(ctypes.c_ubyte)),

2475

ctypes.byref(buf_len))

2476

# Deinit the certificate

2477

gnutls.pubkey_deinit(pubkey)

2478

2479

# Convert the buffer to a Python bytestring

2480

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

2481

# Convert the bytestring to hexadecimal notation

2482

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

2483

return hex_key_id

2484

2485

@staticmethod

2486

def fingerprint(openpgp):

2487

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2488

# New GnuTLS "datum" with the OpenPGP public key

2489

datum = gnutls.datum_t(

2490

ctypes.cast(ctypes.c_char_p(openpgp),

2491

ctypes.POINTER(ctypes.c_ubyte)),

2492

ctypes.c_uint(len(openpgp)))

2493

# New empty GnuTLS certificate

2494

crt = gnutls.openpgp_crt_t()

2495

gnutls.openpgp_crt_init(ctypes.byref(crt))

2496

# Import the OpenPGP public key into the certificate

2497

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

2498

gnutls.OPENPGP_FMT_RAW)

2499

# Verify the self signature in the key

2500

crtverify = ctypes.c_uint()

2501

gnutls.openpgp_crt_verify_self(crt, 0,

2502

ctypes.byref(crtverify))

2503

if crtverify.value != 0:

2504

gnutls.openpgp_crt_deinit(crt)

2505

raise gnutls.CertificateSecurityError(code

2506

=crtverify.value)

2507

# New buffer for the fingerprint

2508

buf = ctypes.create_string_buffer(20)

2509

buf_len = ctypes.c_size_t()

2510

# Get the fingerprint from the certificate into the buffer

2511

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

2512

ctypes.byref(buf_len))

2513

# Deinit the certificate

2514

gnutls.openpgp_crt_deinit(crt)

2515

# Convert the buffer to a Python bytestring

2516

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

2517

# Convert the bytestring to hexadecimal notation

2518

hex_fpr = binascii.hexlify(fpr).upper()

2519

return hex_fpr

2520

2521

2522

class MultiprocessingMixIn:

2523

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

2524

2525

def sub_process_main(self, request, address):

2526

try:

2527

self.finish_request(request, address)

2528

except Exception:

2529

self.handle_error(request, address)

2530

self.close_request(request)

2531

2532

def process_request(self, request, address):

2533

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

2534

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

2535

args=(request, address))

2536

proc.start()

2537

return proc

2538

2539

2540

class MultiprocessingMixInWithPipe(MultiprocessingMixIn):

2541

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

2542

2543

def process_request(self, request, client_address):

2544

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

2545

2546

This function creates a new pipe in self.pipe

2547

"""

2548

parent_pipe, self.child_pipe = multiprocessing.Pipe()

2549

2550

proc = MultiprocessingMixIn.process_request(self, request,

2551

client_address)

2552

self.child_pipe.close()

2553

self.add_pipe(parent_pipe, proc)

2554

2555

def add_pipe(self, parent_pipe, proc):

2556

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

2557

raise NotImplementedError()

2558

2559

2560

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2561

socketserver.TCPServer):

2562

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

2563

2564

Attributes:

2565

enabled: Boolean; whether this server is activated yet

2566

interface: None or a network interface name (string)

2567

use_ipv6: Boolean; to use IPv6 or not

2568

"""

2569

2570

def __init__(self, server_address, RequestHandlerClass,

2571

interface=None,

2572

use_ipv6=True,

2573

socketfd=None):

2574

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

2575

creating a new one with socket.socket().

2576

"""

2577

self.interface = interface

2578

if use_ipv6:

2579

self.address_family = socket.AF_INET6

2580

if socketfd is not None:

2581

# Save the file descriptor

2582

self.socketfd = socketfd

2583

# Save the original socket.socket() function

2584

self.socket_socket = socket.socket

2585

2586

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

2587

#

2588

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

2589

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

2590

# patching socket.socket.)

2591

#

2592

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

2593

@functools.wraps(socket.socket)

2594

def socket_wrapper(*args, **kwargs):

2595

# Restore original function so subsequent calls are

2596

# not affected.

2597

socket.socket = self.socket_socket

2598

del self.socket_socket

2599

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

2600

# saved file descriptor.

2601

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

2602

# Replace socket.socket() function with wrapper

2603

socket.socket = socket_wrapper

2604

# The socketserver.TCPServer.__init__ will call

2605

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

2606

# socket_wrapper(), if socketfd was set.

2607

socketserver.TCPServer.__init__(self, server_address,

2608

RequestHandlerClass)

2609

2610

def server_bind(self):

2611

"""This overrides the normal server_bind() function

2612

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

2613

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

2614

global SO_BINDTODEVICE

2615

if self.interface is not None:

2616

if SO_BINDTODEVICE is None:

2617

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

2618

# common enough.

2619

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

2620

SO_BINDTODEVICE = 25

2621

try:

2622

self.socket.setsockopt(

2623

socket.SOL_SOCKET, SO_BINDTODEVICE,

2624

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

2625

except socket.error as error:

2626

if error.errno == errno.EPERM:

2627

logger.error("No permission to bind to"

2628

" interface %s", self.interface)

2629

elif error.errno == errno.ENOPROTOOPT:

2630

logger.error("SO_BINDTODEVICE not available;"

2631

" cannot bind to interface %s",

2632

self.interface)

2633

elif error.errno == errno.ENODEV:

2634

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

2635

" cannot bind", self.interface)

2636

else:

2637

raise

2638

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

2639

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

2640

if self.server_address[1]:

2641

self.allow_reuse_address = True

2642

if not self.server_address[0]:

2643

if self.address_family == socket.AF_INET6:

2644

any_address = "::" # in6addr_any

2645

else:

2646

any_address = "0.0.0.0" # INADDR_ANY

2647

self.server_address = (any_address,

2648

self.server_address[1])

2649

elif not self.server_address[1]:

2650

self.server_address = (self.server_address[0], 0)

2651

# if self.interface:

2652

# self.server_address = (self.server_address[0],

2653

# 0, # port

2654

# 0, # flowinfo

2655

# if_nametoindex

2656

# (self.interface))

2657

return socketserver.TCPServer.server_bind(self)

2658

2659

2660

class MandosServer(IPv6_TCPServer):

2661

"""Mandos server.

2662

2663

Attributes:

2664

clients: set of Client objects

2665

gnutls_priority GnuTLS priority string

2666

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

2667

2668

Assumes a GLib.MainLoop event loop.

2669

"""

2670

2671

def __init__(self, server_address, RequestHandlerClass,

2672

interface=None,

2673

use_ipv6=True,

2674

clients=None,

2675

gnutls_priority=None,

2676

use_dbus=True,

2677

socketfd=None):

2678

self.enabled = False

2679

self.clients = clients

2680

if self.clients is None:

2681

self.clients = {}

2682

self.use_dbus = use_dbus

2683

self.gnutls_priority = gnutls_priority

2684

IPv6_TCPServer.__init__(self, server_address,

2685

RequestHandlerClass,

2686

interface=interface,

2687

use_ipv6=use_ipv6,

2688

socketfd=socketfd)

2689

2690

def server_activate(self):

2691

if self.enabled:

2692

return socketserver.TCPServer.server_activate(self)

2693

2694

def enable(self):

2695

self.enabled = True

2696

2697

def add_pipe(self, parent_pipe, proc):

2698

# Call "handle_ipc" for both data and EOF events

2699

GLib.io_add_watch(

2700

GLib.IOChannel.unix_new(parent_pipe.fileno()),

2701

GLib.PRIORITY_DEFAULT, GLib.IO_IN | GLib.IO_HUP,

2702

functools.partial(self.handle_ipc,

2703

parent_pipe=parent_pipe,

2704

proc=proc))

2705

2706

def handle_ipc(self, source, condition,

2707

parent_pipe=None,

2708

proc=None,

2709

client_object=None):

2710

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

2711

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

2712

# Wait for other process to exit

2713

proc.join()

2714

return False

2715

2716

# Read a request from the child

2717

request = parent_pipe.recv()

2718

command = request[0]

2719

2720

if command == 'init':

2721

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

2722

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

2723

address = request[3]

2724

2725

for c in self.clients.values():

2726

if key_id == "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855":

2727

continue

2728

if key_id and c.key_id == key_id:

2729

client = c

2730

break

2731

if fpr and c.fingerprint == fpr:

2732

client = c

2733

break

2734

else:

2735

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

2736

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

2737

if self.use_dbus:

2738

# Emit D-Bus signal

2739

mandos_dbus_service.ClientNotFound(key_id or fpr,

2740

address[0])

2741

parent_pipe.send(False)

2742

return False

2743

2744

GLib.io_add_watch(

2745

GLib.IOChannel.unix_new(parent_pipe.fileno()),

2746

GLib.PRIORITY_DEFAULT, GLib.IO_IN | GLib.IO_HUP,

2747

functools.partial(self.handle_ipc,

2748

parent_pipe=parent_pipe,

2749

proc=proc,

2750

client_object=client))

2751

parent_pipe.send(True)

2752

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

2753

# same fileno

2754

return False

2755

if command == 'funcall':

2756

funcname = request[1]

2757

args = request[2]

2758

kwargs = request[3]

2759

2760

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

2761

funcname)(*args,

2762

**kwargs)))

2763

2764

if command == 'getattr':

2765

attrname = request[1]

2766

if isinstance(client_object.__getattribute__(attrname),

2767

collections.abc.Callable):

2768

parent_pipe.send(('function', ))

2769

else:

2770

parent_pipe.send((

2771

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

2772

2773

if command == 'setattr':

2774

attrname = request[1]

2775

value = request[2]

2776

setattr(client_object, attrname, value)

2777

2778

return True

2779

2780

2781

def rfc3339_duration_to_delta(duration):

2782

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

2783

2784

>>> rfc3339_duration_to_delta("P7D") == datetime.timedelta(7)

2785

True

2786

>>> rfc3339_duration_to_delta("PT60S") == datetime.timedelta(0, 60)

2787

True

2788

>>> rfc3339_duration_to_delta("PT60M") == datetime.timedelta(0, 3600)

2789

True

2790

>>> rfc3339_duration_to_delta("PT24H") == datetime.timedelta(1)

2791

True

2792

>>> rfc3339_duration_to_delta("P1W") == datetime.timedelta(7)

2793

True

2794

>>> rfc3339_duration_to_delta("PT5M30S") == datetime.timedelta(0, 330)

2795

True

2796

>>> rfc3339_duration_to_delta("P1DT3M20S") == datetime.timedelta(1, 200)

2797

True

2798

"""

2799

2800

# Parsing an RFC 3339 duration with regular expressions is not

2801

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

2802

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

2803

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

2804

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

2805

# avoid excessive use of external libraries.

2806

2807

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

2808

Token = collections.namedtuple("Token", (

2809

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

2810

# a "group" containing digits

2811

"value", # datetime.timedelta or None

2812

"followers")) # Tokens valid after this token

2813

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

2814

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

2815

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

2816

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

2817

datetime.timedelta(seconds=1),

2818

frozenset((token_end, )))

2819

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

2820

datetime.timedelta(minutes=1),

2821

frozenset((token_second, token_end)))

2822

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

2823

datetime.timedelta(hours=1),

2824

frozenset((token_minute, token_end)))

2825

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

2826

None,

2827

frozenset((token_hour, token_minute,

2828

token_second)))

2829

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

2830

datetime.timedelta(days=1),

2831

frozenset((token_time, token_end)))

2832

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

2833

datetime.timedelta(weeks=4),

2834

frozenset((token_day, token_end)))

2835

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

2836

datetime.timedelta(weeks=52),

2837

frozenset((token_month, token_end)))

2838

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

2839

datetime.timedelta(weeks=1),

2840

frozenset((token_end, )))

2841

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

2842

frozenset((token_year, token_month,

2843

token_day, token_time,

2844

token_week)))

2845

# Define starting values:

2846

# Value so far

2847

value = datetime.timedelta()

2848

found_token = None

2849

# Following valid tokens

2850

followers = frozenset((token_duration, ))

2851

# String left to parse

2852

s = duration

2853

# Loop until end token is found

2854

while found_token is not token_end:

2855

# Search for any currently valid tokens

2856

for token in followers:

2857

match = token.regexp.match(s)

2858

if match is not None:

2859

# Token found

2860

if token.value is not None:

2861

# Value found, parse digits

2862

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

2863

# Add to value so far

2864

value += factor * token.value

2865

# Strip token from string

2866

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

2867

# Go to found token

2868

found_token = token

2869

# Set valid next tokens

2870

followers = found_token.followers

2871

break

2872

else:

2873

# No currently valid tokens were found

2874

raise ValueError("Invalid RFC 3339 duration: {!r}"

2875

.format(duration))

2876

# End token found

2877

return value

2878

34

timeout = options.timeout

35

self.timeout = timeout

36

if interval == -1:

37

interval = options.interval

38

self.interval = interval

39

self.next_check = datetime.datetime.now()

40

41

42

class server_metaclass(type):

43

"Common behavior for the UDP and TCP server classes"

44

def __new__(cls, name, bases, attrs):

45

attrs["address_family"] = socket.AF_INET6

46

attrs["allow_reuse_address"] = True

47

def server_bind(self):

48

if self.options.interface:

49

if not hasattr(socket, "SO_BINDTODEVICE"):

50

# From /usr/include/asm-i486/socket.h

51

socket.SO_BINDTODEVICE = 25

52

try:

53

self.socket.setsockopt(socket.SOL_SOCKET,

54

socket.SO_BINDTODEVICE,

55

self.options.interface)

56

except socket.error, error:

57

if error[0] == errno.EPERM:

58

print "Warning: No permission to bind to interface", \

59

self.options.interface

60

else:

61

raise error

62

return super(type(self), self).server_bind()

63

attrs["server_bind"] = server_bind

64

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

65

if "options" in kwargs:

66

self.options = kwargs["options"]

67

del kwargs["options"]

68

if "clients" in kwargs:

69

self.clients = kwargs["clients"]

70

del kwargs["clients"]

71

if "credentials" in kwargs:

72

self.credentials = kwargs["credentials"]

73

del kwargs["credentials"]

74

return super(type(self), self).__init__(*args, **kwargs)

75

attrs["__init__"] = init

76

return type.__new__(cls, name, bases, attrs)

77

78

79

class udp_handler(SocketServer.DatagramRequestHandler, object):

80

def handle(self):

81

self.wfile.write("Polo")

82

print "UDP request answered"

83

84

85

class IPv6_UDPServer(SocketServer.UDPServer, object):

86

__metaclass__ = server_metaclass

87

def verify_request(self, request, client_address):

88

print "UDP request came"

89

return request[0] == "Marco"

90

91

92

class tcp_handler(SocketServer.BaseRequestHandler, object):

93

def handle(self):

94

print "TCP request came"

95

print "Request:", self.request

96

print "Client Address:", self.client_address

97

print "Server:", self.server

98

session = gnutls.connection.ServerSession(self.request,

99

self.server.credentials)

100

session.handshake()

101

if session.peer_certificate:

102

print "DN:", session.peer_certificate.subject

103

try:

104

session.verify_peer()

105

except gnutls.errors.CertificateError, error:

106

print "Verify failed", error

107

session.bye()

108

return

109

try:

110

session.send(dict((client.dn, client.password)

111

for client in self.server.clients)

112

[session.peer_certificate.subject])

113

except KeyError:

114

session.send("gazonk")

115

# Log maybe? XXX

116

session.bye()

117

118

119

class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):

120

__metaclass__ = server_metaclass

121

request_queue_size = 1024

122

123

124

in6addr_any = "::"

125

126

cred = None

2879

127

2880

128

def string_to_delta(interval):

2881

129

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

2882

130

2883

>>> string_to_delta('7d') == datetime.timedelta(7)

2884

True

2885

>>> string_to_delta('60s') == datetime.timedelta(0, 60)

2886

True

2887

>>> string_to_delta('60m') == datetime.timedelta(0, 3600)

2888

True

2889

>>> string_to_delta('24h') == datetime.timedelta(1)

2890

True

2891

>>> string_to_delta('1w') == datetime.timedelta(7)

2892

True

2893

>>> string_to_delta('5m 30s') == datetime.timedelta(0, 330)

2894

True

131

>>> string_to_delta('7d')

132

datetime.timedelta(7)

133

>>> string_to_delta('60s')

134

datetime.timedelta(0, 60)

135

>>> string_to_delta('60m')

136

datetime.timedelta(0, 3600)

137

>>> string_to_delta('24h')

138

datetime.timedelta(1)

139

>>> string_to_delta(u'1w')

140

datetime.timedelta(7)

2895

141

"""

2896

2897

142

try:

2898

return rfc3339_duration_to_delta(interval)

2899

except ValueError:

2900

pass

2901

2902

timevalue = datetime.timedelta(0)

2903

for s in interval.split():

2904

try:

2905

suffix = s[-1]

2906

value = int(s[:-1])

2907

if suffix == "d":

2908

delta = datetime.timedelta(value)

2909

elif suffix == "s":

2910

delta = datetime.timedelta(0, value)

2911

elif suffix == "m":

2912

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

2913

elif suffix == "h":

2914

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

2915

elif suffix == "w":

2916

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

2917

else:

2918

raise ValueError("Unknown suffix {!r}".format(suffix))

2919

except IndexError as e:

2920

raise ValueError(*(e.args))

2921

timevalue += delta

2922

return timevalue

2923

2924

2925

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

2926

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

2927

2928

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

2929

if os.fork():

2930

sys.exit()

2931

os.setsid()

2932

if not nochdir:

2933

os.chdir("/")

2934

if os.fork():

2935

sys.exit()

2936

if not noclose:

2937

# Close all standard open file descriptors

2938

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

2939

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

2940

raise OSError(errno.ENODEV,

2941

"{} not a character device"

2942

.format(os.devnull))

2943

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

2944

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

2945

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

2946

if null > 2:

2947

os.close(null)

2948

143

suffix=unicode(interval[-1])

144

value=int(interval[:-1])

145

if suffix == u"d":

146

delta = datetime.timedelta(value)

147

elif suffix == u"s":

148

delta = datetime.timedelta(0, value)

149

elif suffix == u"m":

150

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

151

elif suffix == u"h":

152

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

153

elif suffix == u"w":

154

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

155

else:

156

raise ValueError

157

except (ValueError, IndexError):

158

raise ValueError

159

return delta

2949

160

2950

161

def main():

2951

2952

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

2953

# Parsing of options, both command line and config file

2954

2955

parser = argparse.ArgumentParser()

2956

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

2957

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

2958

help="show version number and exit")

2959

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

2960

help="Bind to interface IF")

2961

parser.add_argument("-a", "--address",

2962

help="Address to listen for requests on")

2963

parser.add_argument("-p", "--port", type=int,

2964

help="Port number to receive requests on")

2965

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

2966

help="Run self-test")

2967

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

2968

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

2969

" to terminal", default=None)

2970

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

2971

help="Debug level for stdout output")

2972

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

2973

" priority string (see GnuTLS documentation)")

2974

parser.add_argument("--servicename",

2975

metavar="NAME", help="Zeroconf service name")

2976

parser.add_argument("--configdir",

2977

default="/etc/mandos", metavar="DIR",

2978

help="Directory to search for configuration"

2979

" files")

2980

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

2981

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

2982

" system bus interface", default=None)

2983

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

2984

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

2985

default=None)

2986

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

2987

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

2988

" state", default=None)

2989

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

2990

help="Specify a file descriptor to a network"

2991

" socket to use instead of creating one")

2992

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

2993

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

2994

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

2995

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

2996

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

2997

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

2998

default=None)

2999

3000

options = parser.parse_args()

3001

3002

# Default values for config file for server-global settings

3003

if gnutls.has_rawpk:

3004

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

3005

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

3006

else:

3007

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

3008

":+SIGN-DSA-SHA256")

3009

server_defaults = {"interface": "",

3010

"address": "",

3011

"port": "",

3012

"debug": "False",

3013

"priority": priority,

3014

"servicename": "Mandos",

3015

"use_dbus": "True",

3016

"use_ipv6": "True",

3017

"debuglevel": "",

3018

"restore": "True",

3019

"socket": "",

3020

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

3021

"foreground": "False",

3022

"zeroconf": "True",

3023

}

3024

del priority

3025

3026

# Parse config file for server-global settings

3027

server_config = configparser.ConfigParser(server_defaults)

3028

del server_defaults

3029

server_config.read(os.path.join(options.configdir, "mandos.conf"))

3030

# Convert the ConfigParser object to a dict

3031

server_settings = server_config.defaults()

3032

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

3033

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

3034

"foreground", "zeroconf"):

3035

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

3036

option)

3037

if server_settings["port"]:

3038

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

3039

"port")

3040

if server_settings["socket"]:

3041

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

3042

"socket")

3043

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

3044

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

3045

# happen with a supplied network socket.

3046

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

3047

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

3048

["socket"])

3049

del server_config

3050

3051

# Override the settings from the config file with command line

3052

# options, if set.

3053

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

3054

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

3055

"use_ipv6", "debuglevel", "restore", "statedir",

3056

"socket", "foreground", "zeroconf"):

3057

value = getattr(options, option)

3058

if value is not None:

3059

server_settings[option] = value

3060

del options

3061

# Force all strings to be unicode

3062

for option in server_settings.keys():

3063

if isinstance(server_settings[option], bytes):

3064

server_settings[option] = (server_settings[option]

3065

.decode("utf-8"))

3066

# Force all boolean options to be boolean

3067

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

3068

"foreground", "zeroconf"):

3069

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

3070

# Debug implies foreground

3071

if server_settings["debug"]:

3072

server_settings["foreground"] = True

3073

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

3074

3075

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

3076

3077

if (not server_settings["zeroconf"]

3078

and not (server_settings["port"]

3079

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

3080

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

3081

3082

# For convenience

3083

debug = server_settings["debug"]

3084

debuglevel = server_settings["debuglevel"]

3085

use_dbus = server_settings["use_dbus"]

3086

use_ipv6 = server_settings["use_ipv6"]

3087

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

3088

stored_state_file)

3089

foreground = server_settings["foreground"]

3090

zeroconf = server_settings["zeroconf"]

3091

3092

if debug:

3093

initlogger(debug, logging.DEBUG)

3094

else:

3095

if not debuglevel:

3096

initlogger(debug)

3097

else:

3098

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

3099

initlogger(debug, level)

3100

3101

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

3102

syslogger.setFormatter(

3103

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

3104

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

3105

server_settings["servicename"])))

3106

3107

# Parse config file with clients

3108

client_config = configparser.ConfigParser(Client.client_defaults)

3109

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

3110

"clients.conf"))

3111

3112

global mandos_dbus_service

3113

mandos_dbus_service = None

3114

3115

socketfd = None

3116

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

3117

socketfd = server_settings["socket"]

3118

tcp_server = MandosServer(

3119

(server_settings["address"], server_settings["port"]),

3120

ClientHandler,

3121

interface=(server_settings["interface"] or None),

3122

use_ipv6=use_ipv6,

3123

gnutls_priority=server_settings["priority"],

3124

use_dbus=use_dbus,

3125

socketfd=socketfd)

3126

if not foreground:

3127

pidfilename = "/run/mandos.pid"

3128

if not os.path.isdir("/run/."):

3129

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

3130

pidfile = None

3131

try:

3132

pidfile = codecs.open(pidfilename, "w", encoding="utf-8")

3133

except IOError as e:

3134

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

3135

exc_info=e)

3136

3137

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

3138

("mandos", "mandos"),

3139

("nobody", "nogroup")):

3140

try:

3141

uid = pwd.getpwnam(name).pw_uid

3142

gid = pwd.getpwnam(group).pw_gid

3143

break

3144

except KeyError:

3145

continue

3146

else:

3147

uid = 65534

3148

gid = 65534

3149

try:

3150

os.setgid(gid)

3151

os.setuid(uid)

3152

if debug:

3153

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

3154

gid))

3155

except OSError as error:

3156

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

3157

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

3158

if error.errno != errno.EPERM:

3159

raise

3160

3161

if debug:

3162

# Enable all possible GnuTLS debugging

3163

3164

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

3165

# - GnuTLS manual

3166

gnutls.global_set_log_level(11)

3167

3168

@gnutls.log_func

3169

def debug_gnutls(level, string):

3170

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

3171

3172

gnutls.global_set_log_function(debug_gnutls)

3173

3174

# Redirect stdin so all checkers get /dev/null

3175

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

3176

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

3177

if null > 2:

3178

os.close(null)

3179

3180

# Need to fork before connecting to D-Bus

3181

if not foreground:

3182

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

3183

daemon()

3184

3185

if gi.version_info < (3, 10, 2):

3186

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

3187

# need to inform GLib that threads will be used.

3188

GLib.threads_init()

3189

3190

global main_loop

3191

# From the Avahi example code

3192

DBusGMainLoop(set_as_default=True)

3193

main_loop = GLib.MainLoop()

3194

bus = dbus.SystemBus()

3195

# End of Avahi example code

3196

if use_dbus:

3197

try:

3198

bus_name = dbus.service.BusName("se.recompile.Mandos",

3199

bus,

3200

do_not_queue=True)

3201

old_bus_name = dbus.service.BusName(

3202

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

3203

do_not_queue=True)

3204

except dbus.exceptions.DBusException as e:

3205

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

3206

use_dbus = False

3207

server_settings["use_dbus"] = False

3208

tcp_server.use_dbus = False

3209

if zeroconf:

3210

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

3211

service = AvahiServiceToSyslog(

3212

name=server_settings["servicename"],

3213

servicetype="_mandos._tcp",

3214

protocol=protocol,

3215

bus=bus)

3216

if server_settings["interface"]:

3217

service.interface = if_nametoindex(

3218

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

3219

3220

global multiprocessing_manager

3221

multiprocessing_manager = multiprocessing.Manager()

3222

3223

client_class = Client

3224

if use_dbus:

3225

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

3226

3227

client_settings = Client.config_parser(client_config)

3228

old_client_settings = {}

3229

clients_data = {}

3230

3231

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

3232

global wnull

3233

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

3234

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

3235

# mode

3236

if debug or not foreground:

3237

wnull.close()

3238

3239

# Get client data and settings from last running state.

3240

if server_settings["restore"]:

3241

try:

3242

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

3243

if sys.version_info.major == 2:

3244

clients_data, old_client_settings = pickle.load(

3245

stored_state)

3246

else:

3247

bytes_clients_data, bytes_old_client_settings = (

3248

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

3249

# Fix bytes to strings

3250

# clients_data

3251

# .keys()

3252

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

3253

if isinstance(key, bytes)

3254

else key): value

3255

for key, value in

3256

bytes_clients_data.items()}

3257

del bytes_clients_data

3258

for key in clients_data:

3259

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

3260

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

3261

for k, v in

3262

clients_data[key].items()}

3263

clients_data[key] = value

3264

# .client_structure

3265

value["client_structure"] = [

3266

(s.decode("utf-8")

3267

if isinstance(s, bytes)

3268

else s) for s in

3269

value["client_structure"]]

3270

# .name, .host, and .checker_command

3271

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

3272

if isinstance(value[k], bytes):

3273

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

3274

if "key_id" not in value:

3275

value["key_id"] = ""

3276

elif "fingerprint" not in value:

3277

value["fingerprint"] = ""

3278

# old_client_settings

3279

# .keys()

3280

old_client_settings = {

3281

(key.decode("utf-8")

3282

if isinstance(key, bytes)

3283

else key): value

3284

for key, value in

3285

bytes_old_client_settings.items()}

3286

del bytes_old_client_settings

3287

# .host and .checker_command

3288

for value in old_client_settings.values():

3289

for attribute in ("host", "checker_command"):

3290

if isinstance(value[attribute], bytes):

3291

value[attribute] = (value[attribute]

3292

.decode("utf-8"))

3293

os.remove(stored_state_path)

3294

except IOError as e:

3295

if e.errno == errno.ENOENT:

3296

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

3297

" {}".format(os.strerror(e.errno)))

3298

else:

3299

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

3300

exc_info=e)

3301

raise

3302

except EOFError as e:

3303

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

3304

"EOFError:",

3305

exc_info=e)

3306

3307

with PGPEngine() as pgp:

3308

for client_name, client in clients_data.items():

3309

# Skip removed clients

3310

if client_name not in client_settings:

3311

continue

3312

3313

# Decide which value to use after restoring saved state.

3314

# We have three different values: Old config file,

3315

# new config file, and saved state.

3316

# New config value takes precedence if it differs from old

3317

# config value, otherwise use saved state.

3318

for name, value in client_settings[client_name].items():

3319

try:

3320

# For each value in new config, check if it

3321

# differs from the old config value (Except for

3322

# the "secret" attribute)

3323

if (name != "secret"

3324

and (value !=

3325

old_client_settings[client_name][name])):

3326

client[name] = value

3327

except KeyError:

3328

pass

3329

3330

# Clients who has passed its expire date can still be

3331

# enabled if its last checker was successful. A Client

3332

# whose checker succeeded before we stored its state is

3333

# assumed to have successfully run all checkers during

3334

# downtime.

3335

if client["enabled"]:

3336

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

3337

if not client["last_checked_ok"]:

3338

logger.warning(

3339

"disabling client {} - Client never "

3340

"performed a successful checker".format(

3341

client_name))

3342

client["enabled"] = False

3343

elif client["last_checker_status"] != 0:

3344

logger.warning(

3345

"disabling client {} - Client last"

3346

" checker failed with error code"

3347

" {}".format(

3348

client_name,

3349

client["last_checker_status"]))

3350

client["enabled"] = False

3351

else:

3352

client["expires"] = (

3353

datetime.datetime.utcnow()

3354

+ client["timeout"])

3355

logger.debug("Last checker succeeded,"

3356

" keeping {} enabled".format(

3357

client_name))

3358

try:

3359

client["secret"] = pgp.decrypt(

3360

client["encrypted_secret"],

3361

client_settings[client_name]["secret"])

3362

except PGPError:

3363

# If decryption fails, we use secret from new settings

3364

logger.debug("Failed to decrypt {} old secret".format(

3365

client_name))

3366

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

3367

["secret"])

3368

3369

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

3370

for client_name in (set(old_client_settings)

3371

- set(client_settings)):

3372

del clients_data[client_name]

3373

for client_name in (set(client_settings)

3374

- set(old_client_settings)):

3375

clients_data[client_name] = client_settings[client_name]

3376

3377

# Create all client objects

3378

for client_name, client in clients_data.items():

3379

tcp_server.clients[client_name] = client_class(

3380

name=client_name,

3381

settings=client,

3382

server_settings=server_settings)

3383

3384

if not tcp_server.clients:

3385

logger.warning("No clients defined")

3386

3387

if not foreground:

3388

if pidfile is not None:

3389

pid = os.getpid()

3390

try:

3391

with pidfile:

3392

print(pid, file=pidfile)

3393

except IOError:

3394

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

3395

pidfilename, pid)

3396

del pidfile

3397

del pidfilename

3398

3399

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

3400

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3401

lambda: main_loop.quit() and False)

3402

3403

if use_dbus:

3404

3405

@alternate_dbus_interfaces(

3406

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

3407

class MandosDBusService(DBusObjectWithObjectManager):

3408

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

3409

3410

def __init__(self):

3411

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

3412

3413

_interface = "se.recompile.Mandos"

3414

3415

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

3416

def ClientAdded(self, objpath):

3417

"D-Bus signal"

3418

pass

3419

3420

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

3421

def ClientNotFound(self, key_id, address):

3422

"D-Bus signal"

3423

pass

3424

3425

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

3426

"true"})

3427

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

3428

def ClientRemoved(self, objpath, name):

3429

"D-Bus signal"

3430

pass

3431

3432

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

3433

"true"})

3434

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

3435

def GetAllClients(self):

3436

"D-Bus method"

3437

return dbus.Array(c.dbus_object_path for c in

3438

tcp_server.clients.values())

3439

3440

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

3441

"true"})

3442

@dbus.service.method(_interface,

3443

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

3444

def GetAllClientsWithProperties(self):

3445

"D-Bus method"

3446

return dbus.Dictionary(

3447

{c.dbus_object_path: c.GetAll(

3448

"se.recompile.Mandos.Client")

3449

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

3450

signature="oa{sv}")

3451

3452

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

3453

def RemoveClient(self, object_path):

3454

"D-Bus method"

3455

for c in tcp_server.clients.values():

3456

if c.dbus_object_path == object_path:

3457

del tcp_server.clients[c.name]

3458

c.remove_from_connection()

3459

# Don't signal the disabling

3460

c.disable(quiet=True)

3461

# Emit D-Bus signal for removal

3462

self.client_removed_signal(c)

3463

return

3464

raise KeyError(object_path)

3465

3466

del _interface

3467

3468

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3469

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

3470

def GetManagedObjects(self):

3471

"""D-Bus method"""

3472

return dbus.Dictionary(

3473

{client.dbus_object_path:

3474

dbus.Dictionary(

3475

{interface: client.GetAll(interface)

3476

for interface in

3477

client._get_all_interface_names()})

3478

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

3479

3480

def client_added_signal(self, client):

3481

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

3482

if use_dbus:

3483

# New standard signal

3484

self.InterfacesAdded(

3485

client.dbus_object_path,

3486

dbus.Dictionary(

3487

{interface: client.GetAll(interface)

3488

for interface in

3489

client._get_all_interface_names()}))

3490

# Old signal

3491

self.ClientAdded(client.dbus_object_path)

3492

3493

def client_removed_signal(self, client):

3494

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

3495

if use_dbus:

3496

# New standard signal

3497

self.InterfacesRemoved(

3498

client.dbus_object_path,

3499

client._get_all_interface_names())

3500

# Old signal

3501

self.ClientRemoved(client.dbus_object_path,

3502

client.name)

3503

3504

mandos_dbus_service = MandosDBusService()

3505

3506

# Save modules to variables to exempt the modules from being

3507

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

3508

mp = multiprocessing

3509

wn = wnull

3510

3511

def cleanup():

3512

"Cleanup function; run on exit"

3513

if zeroconf:

3514

service.cleanup()

3515

3516

mp.active_children()

3517

wn.close()

3518

if not (tcp_server.clients or client_settings):

3519

return

3520

3521

# Store client before exiting. Secrets are encrypted with key

3522

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

3523

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

3524

clients = {}

3525

with PGPEngine() as pgp:

3526

for client in tcp_server.clients.values():

3527

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

3528

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

3529

key)

3530

client_dict = {}

3531

3532

# A list of attributes that can not be pickled

3533

# + secret.

3534

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

3535

"checker", "server_settings"}

3536

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

3537

.Object):

3538

exclude.add(name)

3539

3540

client_dict["encrypted_secret"] = (client

3541

.encrypted_secret)

3542

for attr in client.client_structure:

3543

if attr not in exclude:

3544

client_dict[attr] = getattr(client, attr)

3545

3546

clients[client.name] = client_dict

3547

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

3548

3549

try:

3550

with tempfile.NamedTemporaryFile(

3551

mode='wb',

3552

suffix=".pickle",

3553

prefix='clients-',

3554

dir=os.path.dirname(stored_state_path),

3555

delete=False) as stored_state:

3556

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

3557

protocol=2)

3558

tempname = stored_state.name

3559

os.rename(tempname, stored_state_path)

3560

except (IOError, OSError) as e:

3561

if not debug:

3562

try:

3563

os.remove(tempname)

3564

except NameError:

3565

pass

3566

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

3567

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

3568

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

3569

else:

3570

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

3571

exc_info=e)

3572

raise

3573

3574

# Delete all clients, and settings from config

3575

while tcp_server.clients:

3576

name, client = tcp_server.clients.popitem()

3577

if use_dbus:

3578

client.remove_from_connection()

3579

# Don't signal the disabling

3580

client.disable(quiet=True)

3581

# Emit D-Bus signal for removal

3582

if use_dbus:

3583

mandos_dbus_service.client_removed_signal(client)

3584

client_settings.clear()

3585

3586

atexit.register(cleanup)

3587

3588

for client in tcp_server.clients.values():

3589

if use_dbus:

3590

# Emit D-Bus signal for adding

3591

mandos_dbus_service.client_added_signal(client)

3592

# Need to initiate checking of clients

3593

if client.enabled:

3594

client.init_checker()

3595

3596

tcp_server.enable()

3597

tcp_server.server_activate()

3598

3599

# Find out what port we got

3600

if zeroconf:

3601

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

3602

if use_ipv6:

3603

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

3604

" flowinfo %d, scope_id %d",

3605

*tcp_server.socket.getsockname())

3606

else: # IPv4

3607

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

3608

*tcp_server.socket.getsockname())

3609

3610

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

3611

3612

try:

3613

if zeroconf:

3614

# From the Avahi example code

3615

try:

3616

service.activate()

3617

except dbus.exceptions.DBusException as error:

3618

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

3619

cleanup()

3620

sys.exit(1)

3621

# End of Avahi example code

3622

3623

GLib.io_add_watch(

3624

GLib.IOChannel.unix_new(tcp_server.fileno()),

3625

GLib.PRIORITY_DEFAULT, GLib.IO_IN,

3626

lambda *args, **kwargs: (tcp_server.handle_request

3627

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

3628

3629

logger.debug("Starting main loop")

3630

main_loop.run()

3631

except AvahiError as error:

3632

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

3633

cleanup()

3634

sys.exit(1)

3635

except KeyboardInterrupt:

3636

if debug:

3637

print("", file=sys.stderr)

3638

logger.debug("Server received KeyboardInterrupt")

3639

logger.debug("Server exiting")

3640

# Must run before the D-Bus bus name gets deregistered

3641

cleanup()

3642

3643

3644

def should_only_run_tests():

3645

parser = argparse.ArgumentParser(add_help=False)

3646

parser.add_argument("--check", action='store_true')

3647

args, unknown_args = parser.parse_known_args()

3648

run_tests = args.check

3649

if run_tests:

3650

# Remove --check argument from sys.argv

3651

sys.argv[1:] = unknown_args

3652

return run_tests

3653

3654

# Add all tests from doctest strings

3655

def load_tests(loader, tests, none):

3656

import doctest

3657

tests.addTests(doctest.DocTestSuite())

3658

return tests

3659

3660

if __name__ == '__main__':

3661

try:

3662

if should_only_run_tests():

3663

# Call using ./mandos --check [--verbose]

3664

unittest.main()

3665

else:

3666

main()

3667

finally:

3668

logging.shutdown()

162

parser = OptionParser()

163

parser.add_option("-i", "--interface", type="string",

164

default="eth0", metavar="IF",

165

help="Interface to bind to")

166

parser.add_option("--cert", type="string", default="cert.pem",

167

metavar="FILE",

168

help="Public key certificate to use")

169

parser.add_option("--key", type="string", default="key.pem",

170

metavar="FILE",

171

help="Private key to use")

172

parser.add_option("--ca", type="string", default="ca.pem",

173

metavar="FILE",

174

help="Certificate Authority certificate to use")

175

parser.add_option("--crl", type="string", default="crl.pem",

176

metavar="FILE",

177

help="Certificate Revokation List to use")

178

parser.add_option("-p", "--port", type="int", default=49001,

179

help="Port number to receive requests on")

180

parser.add_option("--dh", type="int", metavar="BITS",

181

help="DH group to use")

182

parser.add_option("-t", "--timeout", type="string", # Parsed later

183

default="15m",

184

help="Amount of downtime allowed for clients")

185

parser.add_option("--interval", type="string", # Parsed later

186

default="5m",

187

help="How often to check that a client is up")

188

parser.add_option("--check", action="store_true", default=False,

189

help="Run self-test")

190

(options, args) = parser.parse_args()

191

192

if options.check:

193

import doctest

194

doctest.testmod()

195

sys.exit()

196

197

# Parse the time arguments

198

try:

199

options.timeout = string_to_delta(options.timeout)

200

except ValueError:

201

parser.error("option --timeout: Unparseable time")

202

203

try:

204

options.interval = string_to_delta(options.interval)

205

except ValueError:

206

parser.error("option --interval: Unparseable time")

207

208

cert = gnutls.crypto.X509Certificate(open(options.cert).read())

209

key = gnutls.crypto.X509PrivateKey(open(options.key).read())

210

ca = gnutls.crypto.X509Certificate(open(options.ca).read())

211

crl = gnutls.crypto.X509CRL(open(options.crl).read())

212

cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])

213

214

# Parse config file

215

defaults = {}

216

client_config_object = ConfigParser.SafeConfigParser(defaults)

217

client_config_object.read("mandos-clients.conf")

218

clients = [Client(name=section, options=options,

219

**(dict(client_config_object.items(section))))

220

for section in client_config_object.sections()]

221

222

udp_server = IPv6_UDPServer((in6addr_any, options.port),

223

udp_handler,

224

options=options)

225

226

tcp_server = IPv6_TCPServer((in6addr_any, options.port),

227

tcp_handler,

228

options=options,

229

clients=clients,

230

credentials=cred)

231

232

while True:

233

in_, out, err = select.select((udp_server,

234

tcp_server), (), ())

235

for server in in_:

236

server.handle_request()

237

238

239

if __name__ == "__main__":

240

main()

241