/mandos/trunk : revision 9

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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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14

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

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import codecs

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import unittest

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import random

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import shlex

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84

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

91

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

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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

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113

# Show warnings by default

114

if not sys.warnoptions:

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import warnings

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warnings.simplefilter("default")

117

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

121

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

122

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:

129

# 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 = "1.8.13"

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stored_state_file = "clients.pickle"

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149

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

156

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()"

160

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

161

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]

165

return interface_index

166

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__,

181

func.__closure__)

182

183

184

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

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"""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:'

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' %(message)s'))

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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)

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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):

215

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

216

self.gpg = "gpg"

217

try:

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

219

for line in output.splitlines():

220

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',

228

'--homedir', self.tempdir,

229

'--force-mdc',

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'--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,

528

**kwargs)

529

syslogger.setFormatter(logging.Formatter(

530

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

531

.format(self.name)))

532

return ret

533

534

535

# Pretend that we have a GnuTLS module

536

class gnutls:

537

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

538

539

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

540

if library is None:

541

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

542

_library = ctypes.cdll.LoadLibrary(library)

543

del library

544

545

# Unless otherwise indicated, the constants and types below are

546

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

547

548

# Constants

549

E_SUCCESS = 0

550

E_INTERRUPTED = -52

551

E_AGAIN = -28

552

CRT_OPENPGP = 2

553

CRT_RAWPK = 3

554

CLIENT = 2

555

SHUT_RDWR = 0

556

CRD_CERTIFICATE = 1

557

E_NO_CERTIFICATE_FOUND = -49

558

X509_FMT_DER = 0

559

NO_TICKETS = 1<<10

560

ENABLE_RAWPK = 1<<18

561

CTYPE_PEERS = 3

562

KEYID_USE_SHA256 = 1 # gnutls/x509.h

563

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

564

565

# Types

566

class session_int(ctypes.Structure):

567

_fields_ = []

568

session_t = ctypes.POINTER(session_int)

569

570

class certificate_credentials_st(ctypes.Structure):

571

_fields_ = []

572

certificate_credentials_t = ctypes.POINTER(

573

certificate_credentials_st)

574

certificate_type_t = ctypes.c_int

575

576

class datum_t(ctypes.Structure):

577

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

578

('size', ctypes.c_uint)]

579

580

class openpgp_crt_int(ctypes.Structure):

581

_fields_ = []

582

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

583

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

584

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

585

credentials_type_t = ctypes.c_int

586

transport_ptr_t = ctypes.c_void_p

587

close_request_t = ctypes.c_int

588

589

# Exceptions

590

class Error(Exception):

591

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

592

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

593

# code is passed, convert it to a string with

594

# gnutls.strerror()

595

self.code = code

596

if message is None and code is not None:

597

message = gnutls.strerror(code)

598

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

599

message, *args)

600

601

class CertificateSecurityError(Error):

602

pass

603

604

# Classes

605

class Credentials:

606

def __init__(self):

607

self._c_object = gnutls.certificate_credentials_t()

608

gnutls.certificate_allocate_credentials(

609

ctypes.byref(self._c_object))

610

self.type = gnutls.CRD_CERTIFICATE

611

612

def __del__(self):

613

gnutls.certificate_free_credentials(self._c_object)

614

615

class ClientSession:

616

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

617

self._c_object = gnutls.session_t()

618

gnutls_flags = gnutls.CLIENT

619

if gnutls.check_version(b"3.5.6"):

620

gnutls_flags |= gnutls.NO_TICKETS

621

if gnutls.has_rawpk:

622

gnutls_flags |= gnutls.ENABLE_RAWPK

623

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

624

del gnutls_flags

625

gnutls.set_default_priority(self._c_object)

626

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

627

gnutls.handshake_set_private_extensions(self._c_object,

628

True)

629

self.socket = socket

630

if credentials is None:

631

credentials = gnutls.Credentials()

632

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

633

ctypes.cast(credentials._c_object,

634

ctypes.c_void_p))

635

self.credentials = credentials

636

637

def __del__(self):

638

gnutls.deinit(self._c_object)

639

640

def handshake(self):

641

return gnutls.handshake(self._c_object)

642

643

def send(self, data):

644

data = bytes(data)

645

data_len = len(data)

646

while data_len > 0:

647

data_len -= gnutls.record_send(self._c_object,

648

data[-data_len:],

649

data_len)

650

651

def bye(self):

652

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

653

654

# Error handling functions

655

def _error_code(result):

656

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

657

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

658

if result >= 0:

659

return result

660

if result == gnutls.E_NO_CERTIFICATE_FOUND:

661

raise gnutls.CertificateSecurityError(code=result)

662

raise gnutls.Error(code=result)

663

664

def _retry_on_error(result, func, arguments):

665

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

666

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

667

while result < 0:

668

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

669

return _error_code(result)

670

result = func(*arguments)

671

return result

672

673

# Unless otherwise indicated, the function declarations below are

674

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

675

676

# Functions

677

priority_set_direct = _library.gnutls_priority_set_direct

678

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

679

ctypes.POINTER(ctypes.c_char_p)]

680

priority_set_direct.restype = _error_code

681

682

init = _library.gnutls_init

683

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

684

init.restype = _error_code

685

686

set_default_priority = _library.gnutls_set_default_priority

687

set_default_priority.argtypes = [session_t]

688

set_default_priority.restype = _error_code

689

690

record_send = _library.gnutls_record_send

691

record_send.argtypes = [session_t, ctypes.c_void_p,

692

ctypes.c_size_t]

693

record_send.restype = ctypes.c_ssize_t

694

record_send.errcheck = _retry_on_error

695

696

certificate_allocate_credentials = (

697

_library.gnutls_certificate_allocate_credentials)

698

certificate_allocate_credentials.argtypes = [

699

ctypes.POINTER(certificate_credentials_t)]

700

certificate_allocate_credentials.restype = _error_code

701

702

certificate_free_credentials = (

703

_library.gnutls_certificate_free_credentials)

704

certificate_free_credentials.argtypes = [

705

certificate_credentials_t]

706

certificate_free_credentials.restype = None

707

708

handshake_set_private_extensions = (

709

_library.gnutls_handshake_set_private_extensions)

710

handshake_set_private_extensions.argtypes = [session_t,

711

ctypes.c_int]

712

handshake_set_private_extensions.restype = None

713

714

credentials_set = _library.gnutls_credentials_set

715

credentials_set.argtypes = [session_t, credentials_type_t,

716

ctypes.c_void_p]

717

credentials_set.restype = _error_code

718

719

strerror = _library.gnutls_strerror

720

strerror.argtypes = [ctypes.c_int]

721

strerror.restype = ctypes.c_char_p

722

723

certificate_type_get = _library.gnutls_certificate_type_get

724

certificate_type_get.argtypes = [session_t]

725

certificate_type_get.restype = _error_code

726

727

certificate_get_peers = _library.gnutls_certificate_get_peers

728

certificate_get_peers.argtypes = [session_t,

729

ctypes.POINTER(ctypes.c_uint)]

730

certificate_get_peers.restype = ctypes.POINTER(datum_t)

731

732

global_set_log_level = _library.gnutls_global_set_log_level

733

global_set_log_level.argtypes = [ctypes.c_int]

734

global_set_log_level.restype = None

735

736

global_set_log_function = _library.gnutls_global_set_log_function

737

global_set_log_function.argtypes = [log_func]

738

global_set_log_function.restype = None

739

740

deinit = _library.gnutls_deinit

741

deinit.argtypes = [session_t]

742

deinit.restype = None

743

744

handshake = _library.gnutls_handshake

745

handshake.argtypes = [session_t]

746

handshake.restype = _error_code

747

handshake.errcheck = _retry_on_error

748

749

transport_set_ptr = _library.gnutls_transport_set_ptr

750

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

751

transport_set_ptr.restype = None

752

753

bye = _library.gnutls_bye

754

bye.argtypes = [session_t, close_request_t]

755

bye.restype = _error_code

756

bye.errcheck = _retry_on_error

757

758

check_version = _library.gnutls_check_version

759

check_version.argtypes = [ctypes.c_char_p]

760

check_version.restype = ctypes.c_char_p

761

762

_need_version = b"3.3.0"

763

if check_version(_need_version) is None:

764

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

765

.format(_need_version))

766

767

_tls_rawpk_version = b"3.6.6"

768

has_rawpk = bool(check_version(_tls_rawpk_version))

769

770

if has_rawpk:

771

# Types

772

class pubkey_st(ctypes.Structure):

773

_fields = []

774

pubkey_t = ctypes.POINTER(pubkey_st)

775

776

x509_crt_fmt_t = ctypes.c_int

777

778

# All the function declarations below are from

779

# gnutls/abstract.h

780

pubkey_init = _library.gnutls_pubkey_init

781

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

782

pubkey_init.restype = _error_code

783

784

pubkey_import = _library.gnutls_pubkey_import

785

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

786

x509_crt_fmt_t]

787

pubkey_import.restype = _error_code

788

789

pubkey_get_key_id = _library.gnutls_pubkey_get_key_id

790

pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,

791

ctypes.POINTER(ctypes.c_ubyte),

792

ctypes.POINTER(ctypes.c_size_t)]

793

pubkey_get_key_id.restype = _error_code

794

795

pubkey_deinit = _library.gnutls_pubkey_deinit

796

pubkey_deinit.argtypes = [pubkey_t]

797

pubkey_deinit.restype = None

798

else:

799

# All the function declarations below are from

800

# gnutls/openpgp.h

801

802

openpgp_crt_init = _library.gnutls_openpgp_crt_init

803

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

804

openpgp_crt_init.restype = _error_code

805

806

openpgp_crt_import = _library.gnutls_openpgp_crt_import

807

openpgp_crt_import.argtypes = [openpgp_crt_t,

808

ctypes.POINTER(datum_t),

809

openpgp_crt_fmt_t]

810

openpgp_crt_import.restype = _error_code

811

812

openpgp_crt_verify_self = \

813

_library.gnutls_openpgp_crt_verify_self

814

openpgp_crt_verify_self.argtypes = [

815

openpgp_crt_t,

816

ctypes.c_uint,

817

ctypes.POINTER(ctypes.c_uint),

818

]

819

openpgp_crt_verify_self.restype = _error_code

820

821

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

822

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

823

openpgp_crt_deinit.restype = None

824

825

openpgp_crt_get_fingerprint = (

826

_library.gnutls_openpgp_crt_get_fingerprint)

827

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

828

ctypes.c_void_p,

829

ctypes.POINTER(

830

ctypes.c_size_t)]

831

openpgp_crt_get_fingerprint.restype = _error_code

832

833

if check_version(b"3.6.4"):

834

certificate_type_get2 = _library.gnutls_certificate_type_get2

835

certificate_type_get2.argtypes = [session_t, ctypes.c_int]

836

certificate_type_get2.restype = _error_code

837

838

# Remove non-public functions

839

del _error_code, _retry_on_error

840

841

842

def call_pipe(connection, # : multiprocessing.Connection

843

func, *args, **kwargs):

844

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

845

846

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

847

return value on the provided multiprocessing.Connection.

848

"""

849

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

850

connection.close()

851

852

853

class Client:

854

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

855

856

Attributes:

857

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

858

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

859

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

860

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

861

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

862

running.

863

checker_callback_tag: a GLib event source tag, or None

864

checker_command: string; External command which is run to check

865

if client lives. %() expansions are done at

866

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

867

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

868

checker_initiator_tag: a GLib event source tag, or None

869

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

870

client_structure: Object describing what attributes a client has

871

and is used for storing the client at exit

872

current_checker_command: string; current running checker_command

873

disable_initiator_tag: a GLib event source tag, or None

874

enabled: bool()

875

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

876

uniquely identify an OpenPGP client

877

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

878

a client using raw public keys

879

host: string; available for use by the checker command

880

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

881

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

882

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

883

last_checker_status: integer between 0 and 255 reflecting exit

884

status of last checker. -1 reflects crashed

885

checker, -2 means no checker completed yet.

886

last_checker_signal: The signal which killed the last checker, if

887

last_checker_status is -1

888

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

889

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

890

D-Bus identifiers

891

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

892

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

893

until this client is disabled

894

extended_timeout: extra long timeout when secret has been sent

895

runtime_expansions: Allowed attributes for runtime expansion.

896

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

897

disabled, or None

898

server_settings: The server_settings dict from main()

899

"""

900

901

runtime_expansions = ("approval_delay", "approval_duration",

902

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

903

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

904

"last_approval_request", "last_checked_ok",

905

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

906

client_defaults = {

907

"timeout": "PT5M",

908

"extended_timeout": "PT15M",

909

"interval": "PT2M",

910

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

911

"host": "",

912

"approval_delay": "PT0S",

913

"approval_duration": "PT1S",

914

"approved_by_default": "True",

915

"enabled": "True",

916

}

917

918

@staticmethod

919

def config_parser(config):

920

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

921

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

922

with exceptions for any special settings as defined above.

923

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

924

value given the same arguments.

925

"""

926

settings = {}

927

for client_name in config.sections():

928

section = dict(config.items(client_name))

929

client = settings[client_name] = {}

930

931

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

932

# Reformat values from string types to Python types

933

client["approved_by_default"] = config.getboolean(

934

client_name, "approved_by_default")

935

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

936

"enabled")

937

938

# Uppercase and remove spaces from key_id and fingerprint

939

# for later comparison purposes with return value from the

940

# key_id() and fingerprint() functions

941

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

942

.replace(" ", ""))

943

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

944

.replace(" ", ""))

945

if "secret" in section:

946

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

947

.encode("utf-8"),

948

"base64")

949

elif "secfile" in section:

950

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

951

(section["secfile"])),

952

"rb") as secfile:

953

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

954

else:

955

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

956

.format(section))

957

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

958

client["extended_timeout"] = string_to_delta(

959

section["extended_timeout"])

960

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

961

client["approval_delay"] = string_to_delta(

962

section["approval_delay"])

963

client["approval_duration"] = string_to_delta(

964

section["approval_duration"])

965

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

966

client["last_approval_request"] = None

967

client["last_checked_ok"] = None

968

client["last_checker_status"] = -2

969

970

return settings

971

972

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

973

self.name = name

974

if server_settings is None:

975

server_settings = {}

976

self.server_settings = server_settings

977

# adding all client settings

978

for setting, value in settings.items():

979

setattr(self, setting, value)

980

981

if self.enabled:

982

if not hasattr(self, "last_enabled"):

983

self.last_enabled = datetime.datetime.utcnow()

984

if not hasattr(self, "expires"):

985

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

986

+ self.timeout)

987

else:

988

self.last_enabled = None

989

self.expires = None

990

991

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

992

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

993

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

994

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

995

datetime.datetime.utcnow())

996

997

# attributes specific for this server instance

998

self.checker = None

999

self.checker_initiator_tag = None

1000

self.disable_initiator_tag = None

1001

self.checker_callback_tag = None

1002

self.current_checker_command = None

1003

self.approved = None

1004

self.approvals_pending = 0

1005

self.changedstate = multiprocessing_manager.Condition(

1006

multiprocessing_manager.Lock())

1007

self.client_structure = [attr

1008

for attr in self.__dict__.keys()

1009

if not attr.startswith("_")]

1010

self.client_structure.append("client_structure")

1011

1012

for name, t in inspect.getmembers(

1013

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

1014

if not name.startswith("_"):

1015

self.client_structure.append(name)

1016

1017

# Send notice to process children that client state has changed

1018

def send_changedstate(self):

1019

with self.changedstate:

1020

self.changedstate.notify_all()

1021

1022

def enable(self):

1023

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

1024

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

1025

# Already enabled

1026

return

1027

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

1028

self.enabled = True

1029

self.last_enabled = datetime.datetime.utcnow()

1030

self.init_checker()

1031

self.send_changedstate()

1032

1033

def disable(self, quiet=True):

1034

"""Disable this client."""

1035

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

1036

return False

1037

if not quiet:

1038

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

1039

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

1040

GLib.source_remove(self.disable_initiator_tag)

1041

self.disable_initiator_tag = None

1042

self.expires = None

1043

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

1044

GLib.source_remove(self.checker_initiator_tag)

1045

self.checker_initiator_tag = None

1046

self.stop_checker()

1047

self.enabled = False

1048

if not quiet:

1049

self.send_changedstate()

1050

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

1051

return False

1052

1053

def __del__(self):

1054

self.disable()

1055

1056

def init_checker(self):

1057

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

1058

# and every interval from then on.

1059

if self.checker_initiator_tag is not None:

1060

GLib.source_remove(self.checker_initiator_tag)

1061

self.checker_initiator_tag = GLib.timeout_add(

1062

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

1063

+ 1)),

1064

self.start_checker)

1065

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

1066

if self.disable_initiator_tag is not None:

1067

GLib.source_remove(self.disable_initiator_tag)

1068

self.disable_initiator_tag = GLib.timeout_add(

1069

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

1070

# Also start a new checker *right now*.

1071

self.start_checker()

1072

1073

def checker_callback(self, source, condition, connection,

1074

command):

1075

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

1076

# Read return code from connection (see call_pipe)

1077

returncode = connection.recv()

1078

connection.close()

1079

if self.checker is not None:

1080

self.checker.join()

1081

self.checker_callback_tag = None

1082

self.checker = None

1083

1084

if returncode >= 0:

1085

self.last_checker_status = returncode

1086

self.last_checker_signal = None

1087

if self.last_checker_status == 0:

1088

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

1089

vars(self))

1090

self.checked_ok()

1091

else:

1092

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

1093

else:

1094

self.last_checker_status = -1

1095

self.last_checker_signal = -returncode

1096

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

1097

vars(self))

1098

return False

1099

1100

def checked_ok(self):

1101

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

1102

self.last_checked_ok = datetime.datetime.utcnow()

1103

self.last_checker_status = 0

1104

self.last_checker_signal = None

1105

self.bump_timeout()

1106

1107

def bump_timeout(self, timeout=None):

1108

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

17

18

class Client(object):

19

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

20

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

21

timeout=None, interval=-1):

22

self.name = name

23

self.dn = dn

24

if password:

25

self.password = password

26

elif passfile:

27

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

28

else:

29

print "No Password or Passfile in client config file"

30

# raise RuntimeError XXX

31

self.password = "gazonk"

32

self.fqdn = fqdn # string

33

self.created = datetime.datetime.now()

34

self.last_seen = None # datetime.datetime()

1109

35

if timeout is None:

1110

timeout = self.timeout

1111

if self.disable_initiator_tag is not None:

1112

GLib.source_remove(self.disable_initiator_tag)

1113

self.disable_initiator_tag = None

1114

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

1115

self.disable_initiator_tag = GLib.timeout_add(

1116

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

1117

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

1118

1119

def need_approval(self):

1120

self.last_approval_request = datetime.datetime.utcnow()

1121

36

timeout = options.timeout

37

self.timeout = timeout # datetime.timedelta()

38

if interval == -1:

39

interval = options.interval

40

self.interval = interval # datetime.timedelta()

41

self.next_check = datetime.datetime.now() # datetime.datetime()

42

self.checker = None # or a subprocess.Popen()

43

def check_action(self, now=None):

44

"""The checker said something and might have completed.

45

Check if is has, and take appropriate actions."""

46

if self.checker.poll() is None:

47

# False alarm, no result yet

48

#self.checker.read()

49

return

50

if now is None:

51

now = datetime.datetime.now()

52

if self.checker.returncode == 0:

53

self.last_seen = now

54

while self.next_check <= now:

55

self.next_check += self.interval

56

handle_request = check_action

1122

57

def start_checker(self):

1123

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

1124

1125

If a checker already exists, leave it running and do

1126

nothing."""

1127

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

1128

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

1129

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

1130

# would inevitably timeout, since no checker would get a

1131

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

1132

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

1133

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

1134

# should be.

1135

1136

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

1137

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

1138

self.checker.join()

1139

self.checker = None

1140

# Start a new checker if needed

1141

if self.checker is None:

1142

# Escape attributes for the shell

1143

escaped_attrs = {

1144

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

1145

for attr in self.runtime_expansions}

1146

try:

1147

command = self.checker_command % escaped_attrs

1148

except TypeError as error:

1149

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

1150

self.checker_command,

1151

exc_info=error)

1152

return True # Try again later

1153

self.current_checker_command = command

1154

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

1155

self.name)

1156

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

1157

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

1158

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

1159

# always replaced by /dev/null.)

1160

# The exception is when not debugging but nevertheless

1161

# running in the foreground; use the previously

1162

# created wnull.

1163

popen_args = {"close_fds": True,

1164

"shell": True,

1165

"cwd": "/"}

1166

if (not self.server_settings["debug"]

1167

and self.server_settings["foreground"]):

1168

popen_args.update({"stdout": wnull,

1169

"stderr": wnull})

1170

pipe = multiprocessing.Pipe(duplex=False)

1171

self.checker = multiprocessing.Process(

1172

target=call_pipe,

1173

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

1174

kwargs=popen_args)

1175

self.checker.start()

1176

self.checker_callback_tag = GLib.io_add_watch(

1177

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

1178

GLib.PRIORITY_DEFAULT, GLib.IO_IN,

1179

self.checker_callback, pipe[0], command)

1180

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

1181

return True

1182

58

self.stop_checker()

59

try:

60

self.checker = subprocess.Popen("sleep 1; fping -q -- %s"

61

% re.escape(self.fqdn),

62

stdout=subprocess.PIPE,

63

close_fds=True,

64

shell=True, cwd="/")

65

except subprocess.OSError, e:

66

print "Failed to start subprocess:", e

1183

67

def stop_checker(self):

1184

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

1185

if self.checker_callback_tag:

1186

GLib.source_remove(self.checker_callback_tag)

1187

self.checker_callback_tag = None

1188

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

68

if self.checker is None:

1189

69

return

1190

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

1191

self.checker.terminate()

70

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

71

if self.checker.poll() is None:

72

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

1192

73

self.checker = None

1193

1194

1195

def dbus_service_property(dbus_interface,

1196

signature="v",

1197

access="readwrite",

1198

byte_arrays=False):

1199

"""Decorators for marking methods of a DBusObjectWithProperties to

1200

become properties on the D-Bus.

1201

1202

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

1203

and with one argument by "Set".

1204

1205

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

1206

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

1207

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

1208

"""

1209

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

1210

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

1211

if byte_arrays and signature != "ay":

1212

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

1213

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

1214

1215

def decorator(func):

1216

func._dbus_is_property = True

1217

func._dbus_interface = dbus_interface

1218

func._dbus_signature = signature

1219

func._dbus_access = access

1220

func._dbus_name = func.__name__

1221

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

1222

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

1223

func._dbus_get_args_options = {'byte_arrays': byte_arrays}

1224

return func

1225

1226

return decorator

1227

1228

1229

def dbus_interface_annotations(dbus_interface):

1230

"""Decorator for marking functions returning interface annotations

1231

1232

Usage:

1233

1234

@dbus_interface_annotations("org.example.Interface")

1235

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

1236

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

1237

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

1238

"false"}

1239

"""

1240

1241

def decorator(func):

1242

func._dbus_is_interface = True

1243

func._dbus_interface = dbus_interface

1244

func._dbus_name = dbus_interface

1245

return func

1246

1247

return decorator

1248

1249

1250

def dbus_annotations(annotations):

1251

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

1252

Usage:

1253

1254

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

1255

"org.freedesktop.DBus.Property."

1256

"EmitsChangedSignal": "false"})

1257

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

1258

access="r")

1259

def Property_dbus_property(self):

1260

return dbus.Boolean(False)

1261

1262

See also the DBusObjectWithAnnotations class.

1263

"""

1264

1265

def decorator(func):

1266

func._dbus_annotations = annotations

1267

return func

1268

1269

return decorator

1270

1271

1272

class DBusPropertyException(dbus.exceptions.DBusException):

1273

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

1274

"""

1275

pass

1276

1277

1278

class DBusPropertyAccessException(DBusPropertyException):

1279

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

1280

"""

1281

pass

1282

1283

1284

class DBusPropertyNotFound(DBusPropertyException):

1285

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

1286

"""

1287

pass

1288

1289

1290

class DBusObjectWithAnnotations(dbus.service.Object):

1291

"""A D-Bus object with annotations.

1292

1293

Classes inheriting from this can use the dbus_annotations

1294

decorator to add annotations to methods or signals.

1295

"""

1296

1297

@staticmethod

1298

def _is_dbus_thing(thing):

1299

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

1300

1301

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

1302

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

1303

"""

1304

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

1305

False)

1306

1307

def _get_all_dbus_things(self, thing):

1308

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

1309

"""

1310

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

1311

athing.__get__(self))

1312

for cls in self.__class__.__mro__

1313

for name, athing in

1314

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

1315

1316

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1317

out_signature="s",

1318

path_keyword='object_path',

1319

connection_keyword='connection')

1320

def Introspect(self, object_path, connection):

1321

"""Overloading of standard D-Bus method.

1322

1323

Inserts annotation tags on methods and signals.

1324

"""

1325

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

1326

connection)

1327

try:

1328

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

1329

1330

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

1331

# Add annotation tags

1332

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

1333

for tag in if_tag.getElementsByTagName(typ):

1334

annots = dict()

1335

for name, prop in (self.

1336

_get_all_dbus_things(typ)):

1337

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

1338

and prop._dbus_interface

1339

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

1340

annots.update(getattr(

1341

prop, "_dbus_annotations", {}))

1342

for name, value in annots.items():

1343

ann_tag = document.createElement(

1344

"annotation")

1345

ann_tag.setAttribute("name", name)

1346

ann_tag.setAttribute("value", value)

1347

tag.appendChild(ann_tag)

1348

# Add interface annotation tags

1349

for annotation, value in dict(

1350

itertools.chain.from_iterable(

1351

annotations().items()

1352

for name, annotations

1353

in self._get_all_dbus_things("interface")

1354

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

1355

)).items():

1356

ann_tag = document.createElement("annotation")

1357

ann_tag.setAttribute("name", annotation)

1358

ann_tag.setAttribute("value", value)

1359

if_tag.appendChild(ann_tag)

1360

# Fix argument name for the Introspect method itself

1361

if (if_tag.getAttribute("name")

1362

== dbus.INTROSPECTABLE_IFACE):

1363

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

1364

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

1365

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

1366

if (arg.getAttribute("direction")

1367

== "out"):

1368

arg.setAttribute("name",

1369

"xml_data")

1370

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

1371

document.unlink()

1372

except (AttributeError, xml.dom.DOMException,

1373

xml.parsers.expat.ExpatError) as error:

1374

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

1375

exc_info=error)

1376

return xmlstring

1377

1378

1379

class DBusObjectWithProperties(DBusObjectWithAnnotations):

1380

"""A D-Bus object with properties.

1381

1382

Classes inheriting from this can use the dbus_service_property

1383

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

1384

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

1385

"""

1386

1387

def _get_dbus_property(self, interface_name, property_name):

1388

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

1389

property with the specified name and interface.

1390

"""

1391

for cls in self.__class__.__mro__:

1392

for name, value in inspect.getmembers(

1393

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

1394

if (value._dbus_name == property_name

1395

and value._dbus_interface == interface_name):

1396

return value.__get__(self)

1397

1398

# No such property

1399

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

1400

self.dbus_object_path, interface_name, property_name))

1401

1402

@classmethod

1403

def _get_all_interface_names(cls):

1404

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

1405

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

1406

"_dbus_interface", None)

1407

for x in (inspect.getmro(cls))

1408

for attr in dir(x))

1409

if name is not None)

1410

1411

@dbus.service.method(dbus.PROPERTIES_IFACE,

1412

in_signature="ss",

1413

out_signature="v")

1414

def Get(self, interface_name, property_name):

1415

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

1416

"""

1417

prop = self._get_dbus_property(interface_name, property_name)

1418

if prop._dbus_access == "write":

1419

raise DBusPropertyAccessException(property_name)

1420

value = prop()

1421

if not hasattr(value, "variant_level"):

1422

return value

1423

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

1424

1425

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

1426

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

1427

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

1428

"""

1429

prop = self._get_dbus_property(interface_name, property_name)

1430

if prop._dbus_access == "read":

1431

raise DBusPropertyAccessException(property_name)

1432

if prop._dbus_get_args_options["byte_arrays"]:

1433

# The byte_arrays option is not supported yet on

1434

# signatures other than "ay".

1435

if prop._dbus_signature != "ay":

1436

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

1437

"'ay' signature {!r}"

1438

.format(prop._dbus_signature))

1439

value = dbus.ByteArray(bytes(value))

1440

prop(value)

1441

1442

@dbus.service.method(dbus.PROPERTIES_IFACE,

1443

in_signature="s",

1444

out_signature="a{sv}")

1445

def GetAll(self, interface_name):

1446

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

1447

standard.

1448

1449

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

1450

"""

1451

properties = {}

1452

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

1453

if (interface_name

1454

and interface_name != prop._dbus_interface):

1455

# Interface non-empty but did not match

1456

continue

1457

# Ignore write-only properties

1458

if prop._dbus_access == "write":

1459

continue

1460

value = prop()

1461

if not hasattr(value, "variant_level"):

1462

properties[name] = value

1463

continue

1464

properties[name] = type(value)(

1465

value, variant_level=value.variant_level + 1)

1466

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

1467

1468

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

1469

def PropertiesChanged(self, interface_name, changed_properties,

1470

invalidated_properties):

1471

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

1472

standard.

1473

"""

1474

pass

1475

1476

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1477

out_signature="s",

1478

path_keyword='object_path',

1479

connection_keyword='connection')

1480

def Introspect(self, object_path, connection):

1481

"""Overloading of standard D-Bus method.

1482

1483

Inserts property tags and interface annotation tags.

1484

"""

1485

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1486

object_path,

1487

connection)

1488

try:

1489

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

1490

1491

def make_tag(document, name, prop):

1492

e = document.createElement("property")

1493

e.setAttribute("name", name)

1494

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

1495

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

1496

return e

1497

1498

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

1499

# Add property tags

1500

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

1501

for name, prop

1502

in self._get_all_dbus_things("property")

1503

if prop._dbus_interface

1504

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

1505

if_tag.appendChild(tag)

1506

# Add annotation tags for properties

1507

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

1508

annots = dict()

1509

for name, prop in self._get_all_dbus_things(

1510

"property"):

1511

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

1512

and prop._dbus_interface

1513

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

1514

annots.update(getattr(

1515

prop, "_dbus_annotations", {}))

1516

for name, value in annots.items():

1517

ann_tag = document.createElement(

1518

"annotation")

1519

ann_tag.setAttribute("name", name)

1520

ann_tag.setAttribute("value", value)

1521

tag.appendChild(ann_tag)

1522

# Add the names to the return values for the

1523

# "org.freedesktop.DBus.Properties" methods

1524

if (if_tag.getAttribute("name")

1525

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

1526

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

1527

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

1528

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

1529

if (arg.getAttribute("direction")

1530

== "out"):

1531

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

1532

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

1533

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

1534

if (arg.getAttribute("direction")

1535

== "out"):

1536

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

1537

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

1538

document.unlink()

1539

except (AttributeError, xml.dom.DOMException,

1540

xml.parsers.expat.ExpatError) as error:

1541

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

1542

exc_info=error)

1543

return xmlstring

1544

1545

1546

try:

1547

dbus.OBJECT_MANAGER_IFACE

1548

except AttributeError:

1549

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

1550

1551

1552

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1553

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

1554

1555

Classes inheriting from this exposes the standard

1556

GetManagedObjects call and the InterfacesAdded and

1557

InterfacesRemoved signals on the standard

1558

"org.freedesktop.DBus.ObjectManager" interface.

1559

1560

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

1561

manually.

1562

"""

1563

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1564

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

1565

def GetManagedObjects(self):

1566

"""This function must be overridden"""

1567

raise NotImplementedError()

1568

1569

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1570

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

1571

def InterfacesAdded(self, object_path, interfaces_and_properties):

1572

pass

1573

1574

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

1575

def InterfacesRemoved(self, object_path, interfaces):

1576

pass

1577

1578

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1579

out_signature="s",

1580

path_keyword='object_path',

1581

connection_keyword='connection')

1582

def Introspect(self, object_path, connection):

1583

"""Overloading of standard D-Bus method.

1584

1585

Override return argument name of GetManagedObjects to be

1586

"objpath_interfaces_and_properties"

1587

"""

1588

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1589

object_path,

1590

connection)

1591

try:

1592

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

1593

1594

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

1595

# Fix argument name for the GetManagedObjects method

1596

if (if_tag.getAttribute("name")

1597

== dbus.OBJECT_MANAGER_IFACE):

1598

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

1599

if (cn.getAttribute("name")

1600

== "GetManagedObjects"):

1601

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

1602

if (arg.getAttribute("direction")

1603

== "out"):

1604

arg.setAttribute(

1605

"name",

1606

"objpath_interfaces"

1607

"_and_properties")

1608

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

1609

document.unlink()

1610

except (AttributeError, xml.dom.DOMException,

1611

xml.parsers.expat.ExpatError) as error:

1612

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

1613

exc_info=error)

1614

return xmlstring

1615

1616

1617

def datetime_to_dbus(dt, variant_level=0):

1618

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

1619

if dt is None:

1620

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

1621

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

1622

1623

1624

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1625

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

1626

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

1627

interface names according to the "alt_interface_names" mapping.

1628

Usage:

1629

1630

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

1631

"net.example.AlternateInterface"})

1632

class SampleDBusObject(dbus.service.Object):

1633

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

1634

def SampleDBusMethod():

1635

pass

1636

1637

The above "SampleDBusMethod" on "SampleDBusObject" will be

1638

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

1639

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

1640

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

1641

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

1642

1643

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

1644

(from DBusObjectWithProperties) and interfaces (from the

1645

dbus_interface_annotations decorator).

1646

"""

1647

1648

def wrapper(cls):

1649

for orig_interface_name, alt_interface_name in (

1650

alt_interface_names.items()):

1651

attr = {}

1652

interface_names = set()

1653

# Go though all attributes of the class

1654

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

1655

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

1656

# with the wrong interface name

1657

if (not hasattr(attribute, "_dbus_interface")

1658

or not attribute._dbus_interface.startswith(

1659

orig_interface_name)):

1660

continue

1661

# Create an alternate D-Bus interface name based on

1662

# the current name

1663

alt_interface = attribute._dbus_interface.replace(

1664

orig_interface_name, alt_interface_name)

1665

interface_names.add(alt_interface)

1666

# Is this a D-Bus signal?

1667

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

1668

# Extract the original non-method undecorated

1669

# function by black magic

1670

if sys.version_info.major == 2:

1671

nonmethod_func = (dict(

1672

zip(attribute.func_code.co_freevars,

1673

attribute.__closure__))

1674

["func"].cell_contents)

1675

else:

1676

nonmethod_func = (dict(

1677

zip(attribute.__code__.co_freevars,

1678

attribute.__closure__))

1679

["func"].cell_contents)

1680

# Create a new, but exactly alike, function

1681

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

1682

# with the alternate D-Bus interface name

1683

new_function = copy_function(nonmethod_func)

1684

new_function = (dbus.service.signal(

1685

alt_interface,

1686

attribute._dbus_signature)(new_function))

1687

# Copy annotations, if any

1688

try:

1689

new_function._dbus_annotations = dict(

1690

attribute._dbus_annotations)

1691

except AttributeError:

1692

pass

1693

1694

# Define a creator of a function to call both the

1695

# original and alternate functions, so both the

1696

# original and alternate signals gets sent when

1697

# the function is called

1698

def fixscope(func1, func2):

1699

"""This function is a scope container to pass

1700

func1 and func2 to the "call_both" function

1701

outside of its arguments"""

1702

1703

@functools.wraps(func2)

1704

def call_both(*args, **kwargs):

1705

"""This function will emit two D-Bus

1706

signals by calling func1 and func2"""

1707

func1(*args, **kwargs)

1708

func2(*args, **kwargs)

1709

# Make wrapper function look like a D-Bus

1710

# signal

1711

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

1712

if name.startswith("_dbus_"):

1713

setattr(call_both, name, attr)

1714

1715

return call_both

1716

# Create the "call_both" function and add it to

1717

# the class

1718

attr[attrname] = fixscope(attribute, new_function)

1719

# Is this a D-Bus method?

1720

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

1721

# Create a new, but exactly alike, function

1722

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

1723

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

1724

# to the class.

1725

attr[attrname] = (

1726

dbus.service.method(

1727

alt_interface,

1728

attribute._dbus_in_signature,

1729

attribute._dbus_out_signature)

1730

(copy_function(attribute)))

1731

# Copy annotations, if any

1732

try:

1733

attr[attrname]._dbus_annotations = dict(

1734

attribute._dbus_annotations)

1735

except AttributeError:

1736

pass

1737

# Is this a D-Bus property?

1738

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

1739

# Create a new, but exactly alike, function

1740

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

1741

# property with the alternate D-Bus interface

1742

# name. Add it to the class.

1743

attr[attrname] = (dbus_service_property(

1744

alt_interface, attribute._dbus_signature,

1745

attribute._dbus_access,

1746

attribute._dbus_get_args_options

1747

["byte_arrays"])

1748

(copy_function(attribute)))

1749

# Copy annotations, if any

1750

try:

1751

attr[attrname]._dbus_annotations = dict(

1752

attribute._dbus_annotations)

1753

except AttributeError:

1754

pass

1755

# Is this a D-Bus interface?

1756

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

1757

# Create a new, but exactly alike, function

1758

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

1759

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

1760

# to the class.

1761

attr[attrname] = (

1762

dbus_interface_annotations(alt_interface)

1763

(copy_function(attribute)))

1764

if deprecate:

1765

# Deprecate all alternate interfaces

1766

iname = "_AlternateDBusNames_interface_annotation{}"

1767

for interface_name in interface_names:

1768

1769

@dbus_interface_annotations(interface_name)

1770

def func(self):

1771

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

1772

"true"}

1773

# Find an unused name

1774

for aname in (iname.format(i)

1775

for i in itertools.count()):

1776

if aname not in attr:

1777

attr[aname] = func

1778

break

1779

if interface_names:

1780

# Replace the class with a new subclass of it with

1781

# methods, signals, etc. as created above.

1782

if sys.version_info.major == 2:

1783

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

1784

(cls, ), attr)

1785

else:

1786

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

1787

(cls, ), attr)

1788

return cls

1789

1790

return wrapper

1791

1792

1793

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

1794

"se.bsnet.fukt.Mandos"})

1795

class ClientDBus(Client, DBusObjectWithProperties):

1796

"""A Client class using D-Bus

1797

1798

Attributes:

1799

dbus_object_path: dbus.ObjectPath

1800

bus: dbus.SystemBus()

1801

"""

1802

1803

runtime_expansions = (Client.runtime_expansions

1804

+ ("dbus_object_path", ))

1805

1806

_interface = "se.recompile.Mandos.Client"

1807

1808

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

1809

1810

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

1811

self.bus = bus

1812

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

1813

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

1814

# the D-Bus

1815

client_object_name = str(self.name).translate(

1816

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

1817

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

1818

self.dbus_object_path = dbus.ObjectPath(

1819

"/clients/" + client_object_name)

1820

DBusObjectWithProperties.__init__(self, self.bus,

1821

self.dbus_object_path)

1822

1823

def notifychangeproperty(transform_func, dbus_name,

1824

type_func=lambda x: x,

1825

variant_level=1,

1826

invalidate_only=False,

1827

_interface=_interface):

1828

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

1829

its changes to DBus.

1830

1831

transform_fun: Function that takes a value and a variant_level

1832

and transforms it to a D-Bus type.

1833

dbus_name: D-Bus name of the variable

1834

type_func: Function that transform the value before sending it

1835

to the D-Bus. Default: no transform

1836

variant_level: D-Bus variant level. Default: 1

1837

"""

1838

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

1839

1840

def setter(self, value):

1841

if hasattr(self, "dbus_object_path"):

1842

if (not hasattr(self, attrname) or

1843

type_func(getattr(self, attrname, None))

1844

!= type_func(value)):

1845

if invalidate_only:

1846

self.PropertiesChanged(

1847

_interface, dbus.Dictionary(),

1848

dbus.Array((dbus_name, )))

1849

else:

1850

dbus_value = transform_func(

1851

type_func(value),

1852

variant_level=variant_level)

1853

self.PropertyChanged(dbus.String(dbus_name),

1854

dbus_value)

1855

self.PropertiesChanged(

1856

_interface,

1857

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

1858

dbus_value}),

1859

dbus.Array())

1860

setattr(self, attrname, value)

1861

1862

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

1863

1864

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1865

approvals_pending = notifychangeproperty(dbus.Boolean,

1866

"ApprovalPending",

1867

type_func=bool)

1868

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

1869

last_enabled = notifychangeproperty(datetime_to_dbus,

1870

"LastEnabled")

1871

checker = notifychangeproperty(

1872

dbus.Boolean, "CheckerRunning",

1873

type_func=lambda checker: checker is not None)

1874

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1875

"LastCheckedOK")

1876

last_checker_status = notifychangeproperty(dbus.Int16,

1877

"LastCheckerStatus")

1878

last_approval_request = notifychangeproperty(

1879

datetime_to_dbus, "LastApprovalRequest")

1880

approved_by_default = notifychangeproperty(dbus.Boolean,

1881

"ApprovedByDefault")

1882

approval_delay = notifychangeproperty(

1883

dbus.UInt64, "ApprovalDelay",

1884

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

1885

approval_duration = notifychangeproperty(

1886

dbus.UInt64, "ApprovalDuration",

1887

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

1888

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

1889

timeout = notifychangeproperty(

1890

dbus.UInt64, "Timeout",

1891

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

1892

extended_timeout = notifychangeproperty(

1893

dbus.UInt64, "ExtendedTimeout",

1894

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

1895

interval = notifychangeproperty(

1896

dbus.UInt64, "Interval",

1897

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

1898

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

1899

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

1900

invalidate_only=True)

1901

1902

del notifychangeproperty

1903

1904

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

1905

try:

1906

self.remove_from_connection()

1907

except LookupError:

1908

pass

1909

if hasattr(DBusObjectWithProperties, "__del__"):

1910

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

1911

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

1912

1913

def checker_callback(self, source, condition,

1914

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

1915

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

1916

connection, command, *args,

1917

**kwargs)

1918

exitstatus = self.last_checker_status

1919

if exitstatus >= 0:

1920

# Emit D-Bus signal

1921

self.CheckerCompleted(dbus.Int16(exitstatus),

1922

# This is specific to GNU libC

1923

dbus.Int64(exitstatus << 8),

1924

dbus.String(command))

1925

else:

1926

# Emit D-Bus signal

1927

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

1928

dbus.Int64(

1929

# This is specific to GNU libC

1930

(exitstatus << 8)

1931

| self.last_checker_signal),

1932

dbus.String(command))

1933

return ret

1934

1935

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

1936

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

1937

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

1938

# Only if new checker process was started

1939

if (self.checker is not None

1940

and old_checker_pid != self.checker.pid):

1941

# Emit D-Bus signal

1942

self.CheckerStarted(self.current_checker_command)

1943

return r

1944

1945

def _reset_approved(self):

1946

self.approved = None

1947

return False

1948

1949

def approve(self, value=True):

1950

self.approved = value

1951

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

1952

* 1000), self._reset_approved)

1953

self.send_changedstate()

1954

1955

# D-Bus methods, signals & properties

1956

1957

# Interfaces

1958

1959

# Signals

1960

1961

# CheckerCompleted - signal

1962

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

1963

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

1964

"D-Bus signal"

1965

pass

1966

1967

# CheckerStarted - signal

1968

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

1969

def CheckerStarted(self, command):

1970

"D-Bus signal"

1971

pass

1972

1973

# PropertyChanged - signal

1974

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

1975

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

1976

def PropertyChanged(self, property, value):

1977

"D-Bus signal"

1978

pass

1979

1980

# GotSecret - signal

1981

@dbus.service.signal(_interface)

1982

def GotSecret(self):

1983

"""D-Bus signal

1984

Is sent after a successful transfer of secret from the Mandos

1985

server to mandos-client

1986

"""

1987

pass

1988

1989

# Rejected - signal

1990

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

1991

def Rejected(self, reason):

1992

"D-Bus signal"

1993

pass

1994

1995

# NeedApproval - signal

1996

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

1997

def NeedApproval(self, timeout, default):

1998

"D-Bus signal"

1999

return self.need_approval()

2000

2001

# Methods

2002

2003

# Approve - method

2004

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

2005

def Approve(self, value):

2006

self.approve(value)

2007

2008

# CheckedOK - method

2009

@dbus.service.method(_interface)

2010

def CheckedOK(self):

2011

self.checked_ok()

2012

2013

# Enable - method

2014

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

2015

@dbus.service.method(_interface)

2016

def Enable(self):

2017

"D-Bus method"

2018

self.enable()

2019

2020

# StartChecker - method

2021

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

2022

@dbus.service.method(_interface)

2023

def StartChecker(self):

2024

"D-Bus method"

2025

self.start_checker()

2026

2027

# Disable - method

2028

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

2029

@dbus.service.method(_interface)

2030

def Disable(self):

2031

"D-Bus method"

2032

self.disable()

2033

2034

# StopChecker - method

2035

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

2036

@dbus.service.method(_interface)

2037

def StopChecker(self):

2038

self.stop_checker()

2039

2040

# Properties

2041

2042

# ApprovalPending - property

2043

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

2044

def ApprovalPending_dbus_property(self):

2045

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

2046

2047

# ApprovedByDefault - property

2048

@dbus_service_property(_interface,

2049

signature="b",

2050

access="readwrite")

2051

def ApprovedByDefault_dbus_property(self, value=None):

2052

if value is None: # get

2053

return dbus.Boolean(self.approved_by_default)

2054

self.approved_by_default = bool(value)

2055

2056

# ApprovalDelay - property

2057

@dbus_service_property(_interface,

2058

signature="t",

2059

access="readwrite")

2060

def ApprovalDelay_dbus_property(self, value=None):

2061

if value is None: # get

2062

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

2063

* 1000)

2064

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

2065

2066

# ApprovalDuration - property

2067

@dbus_service_property(_interface,

2068

signature="t",

2069

access="readwrite")

2070

def ApprovalDuration_dbus_property(self, value=None):

2071

if value is None: # get

2072

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

2073

* 1000)

2074

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

2075

2076

# Name - property

2077

@dbus_annotations(

2078

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

2079

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

2080

def Name_dbus_property(self):

2081

return dbus.String(self.name)

2082

2083

# KeyID - property

2084

@dbus_annotations(

2085

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

2086

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

2087

def KeyID_dbus_property(self):

2088

return dbus.String(self.key_id)

2089

2090

# Fingerprint - property

2091

@dbus_annotations(

2092

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

2093

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

2094

def Fingerprint_dbus_property(self):

2095

return dbus.String(self.fingerprint)

2096

2097

# Host - property

2098

@dbus_service_property(_interface,

2099

signature="s",

2100

access="readwrite")

2101

def Host_dbus_property(self, value=None):

2102

if value is None: # get

2103

return dbus.String(self.host)

2104

self.host = str(value)

2105

2106

# Created - property

2107

@dbus_annotations(

2108

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

2109

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

2110

def Created_dbus_property(self):

2111

return datetime_to_dbus(self.created)

2112

2113

# LastEnabled - property

2114

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

2115

def LastEnabled_dbus_property(self):

2116

return datetime_to_dbus(self.last_enabled)

2117

2118

# Enabled - property

2119

@dbus_service_property(_interface,

2120

signature="b",

2121

access="readwrite")

2122

def Enabled_dbus_property(self, value=None):

2123

if value is None: # get

2124

return dbus.Boolean(self.enabled)

2125

if value:

2126

self.enable()

2127

else:

2128

self.disable()

2129

2130

# LastCheckedOK - property

2131

@dbus_service_property(_interface,

2132

signature="s",

2133

access="readwrite")

2134

def LastCheckedOK_dbus_property(self, value=None):

2135

if value is not None:

2136

self.checked_ok()

2137

return

2138

return datetime_to_dbus(self.last_checked_ok)

2139

2140

# LastCheckerStatus - property

2141

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

2142

def LastCheckerStatus_dbus_property(self):

2143

return dbus.Int16(self.last_checker_status)

2144

2145

# Expires - property

2146

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

2147

def Expires_dbus_property(self):

2148

return datetime_to_dbus(self.expires)

2149

2150

# LastApprovalRequest - property

2151

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

2152

def LastApprovalRequest_dbus_property(self):

2153

return datetime_to_dbus(self.last_approval_request)

2154

2155

# Timeout - property

2156

@dbus_service_property(_interface,

2157

signature="t",

2158

access="readwrite")

2159

def Timeout_dbus_property(self, value=None):

2160

if value is None: # get

2161

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

2162

old_timeout = self.timeout

2163

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

2164

# Reschedule disabling

2165

if self.enabled:

2166

now = datetime.datetime.utcnow()

2167

self.expires += self.timeout - old_timeout

2168

if self.expires <= now:

2169

# The timeout has passed

2170

self.disable()

2171

else:

2172

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

2173

is None):

2174

return

2175

GLib.source_remove(self.disable_initiator_tag)

2176

self.disable_initiator_tag = GLib.timeout_add(

2177

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

2178

self.disable)

2179

2180

# ExtendedTimeout - property

2181

@dbus_service_property(_interface,

2182

signature="t",

2183

access="readwrite")

2184

def ExtendedTimeout_dbus_property(self, value=None):

2185

if value is None: # get

2186

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

2187

* 1000)

2188

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

2189

2190

# Interval - property

2191

@dbus_service_property(_interface,

2192

signature="t",

2193

access="readwrite")

2194

def Interval_dbus_property(self, value=None):

2195

if value is None: # get

2196

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

2197

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

2198

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

2199

return

2200

if self.enabled:

2201

# Reschedule checker run

2202

GLib.source_remove(self.checker_initiator_tag)

2203

self.checker_initiator_tag = GLib.timeout_add(

2204

value, self.start_checker)

2205

self.start_checker() # Start one now, too

2206

2207

# Checker - property

2208

@dbus_service_property(_interface,

2209

signature="s",

2210

access="readwrite")

2211

def Checker_dbus_property(self, value=None):

2212

if value is None: # get

2213

return dbus.String(self.checker_command)

2214

self.checker_command = str(value)

2215

2216

# CheckerRunning - property

2217

@dbus_service_property(_interface,

2218

signature="b",

2219

access="readwrite")

2220

def CheckerRunning_dbus_property(self, value=None):

2221

if value is None: # get

2222

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

2223

if value:

2224

self.start_checker()

2225

else:

2226

self.stop_checker()

2227

2228

# ObjectPath - property

2229

@dbus_annotations(

2230

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

2231

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

2232

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

2233

def ObjectPath_dbus_property(self):

2234

return self.dbus_object_path # is already a dbus.ObjectPath

2235

2236

# Secret = property

2237

@dbus_annotations(

2238

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

2239

"invalidates"})

2240

@dbus_service_property(_interface,

2241

signature="ay",

2242

access="write",

2243

byte_arrays=True)

2244

def Secret_dbus_property(self, value):

2245

self.secret = bytes(value)

2246

2247

del _interface

2248

2249

2250

class ProxyClient:

2251

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

2252

self._pipe = child_pipe

2253

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

2254

if not self._pipe.recv():

2255

raise KeyError(key_id or fpr)

2256

2257

def __getattribute__(self, name):

2258

if name == '_pipe':

2259

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

2260

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

2261

data = self._pipe.recv()

2262

if data[0] == 'data':

2263

return data[1]

2264

if data[0] == 'function':

2265

2266

def func(*args, **kwargs):

2267

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

2268

return self._pipe.recv()[1]

2269

2270

return func

2271

2272

def __setattr__(self, name, value):

2273

if name == '_pipe':

2274

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

2275

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

2276

2277

2278

class ClientHandler(socketserver.BaseRequestHandler, object):

2279

"""A class to handle client connections.

2280

2281

Instantiated once for each connection to handle it.

2282

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

2283

2284

def handle(self):

2285

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

2286

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

2287

str(self.client_address))

2288

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

2289

self.server.child_pipe.fileno())

2290

2291

session = gnutls.ClientSession(self.request)

2292

2293

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

2294

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

2295

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

2296

# "+DHE-DSS"))

2297

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

2298

priority = self.server.gnutls_priority

2299

if priority is None:

2300

priority = "NORMAL"

2301

gnutls.priority_set_direct(session._c_object,

2302

priority.encode("utf-8"),

2303

None)

2304

2305

# Start communication using the Mandos protocol

2306

# Get protocol number

2307

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

2308

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

2309

try:

2310

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

2311

raise RuntimeError(line)

2312

except (ValueError, IndexError, RuntimeError) as error:

2313

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

2314

return

2315

2316

# Start GnuTLS connection

2317

try:

2318

session.handshake()

2319

except gnutls.Error as error:

2320

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

2321

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

2322

# established. Just abandon the request.

2323

return

2324

logger.debug("Handshake succeeded")

2325

2326

approval_required = False

2327

try:

2328

if gnutls.has_rawpk:

2329

fpr = b""

2330

try:

2331

key_id = self.key_id(

2332

self.peer_certificate(session))

2333

except (TypeError, gnutls.Error) as error:

2334

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

2335

return

2336

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

2337

2338

else:

2339

key_id = b""

2340

try:

2341

fpr = self.fingerprint(

2342

self.peer_certificate(session))

2343

except (TypeError, gnutls.Error) as error:

2344

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

2345

return

2346

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

2347

2348

try:

2349

client = ProxyClient(child_pipe, key_id, fpr,

2350

self.client_address)

2351

except KeyError:

2352

return

2353

2354

if client.approval_delay:

2355

delay = client.approval_delay

2356

client.approvals_pending += 1

2357

approval_required = True

2358

2359

while True:

2360

if not client.enabled:

2361

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

2362

client.name)

2363

if self.server.use_dbus:

2364

# Emit D-Bus signal

2365

client.Rejected("Disabled")

2366

return

2367

2368

if client.approved or not client.approval_delay:

2369

# We are approved or approval is disabled

2370

break

2371

elif client.approved is None:

2372

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

2373

client.name)

2374

if self.server.use_dbus:

2375

# Emit D-Bus signal

2376

client.NeedApproval(

2377

client.approval_delay.total_seconds()

2378

* 1000, client.approved_by_default)

2379

else:

2380

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

2381

client.name)

2382

if self.server.use_dbus:

2383

# Emit D-Bus signal

2384

client.Rejected("Denied")

2385

return

2386

2387

# wait until timeout or approved

2388

time = datetime.datetime.now()

2389

client.changedstate.acquire()

2390

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

2391

client.changedstate.release()

2392

time2 = datetime.datetime.now()

2393

if (time2 - time) >= delay:

2394

if not client.approved_by_default:

2395

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

2396

" waiting for approval",

2397

client.name)

2398

if self.server.use_dbus:

2399

# Emit D-Bus signal

2400

client.Rejected("Approval timed out")

2401

return

2402

else:

2403

break

2404

else:

2405

delay -= time2 - time

2406

2407

try:

2408

session.send(client.secret)

2409

except gnutls.Error as error:

2410

logger.warning("gnutls send failed",

2411

exc_info=error)

2412

return

2413

2414

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

2415

# bump the timeout using extended_timeout

2416

client.bump_timeout(client.extended_timeout)

2417

if self.server.use_dbus:

2418

# Emit D-Bus signal

2419

client.GotSecret()

2420

2421

finally:

2422

if approval_required:

2423

client.approvals_pending -= 1

2424

try:

2425

session.bye()

2426

except gnutls.Error as error:

2427

logger.warning("GnuTLS bye failed",

2428

exc_info=error)

2429

2430

@staticmethod

2431

def peer_certificate(session):

2432

"Return the peer's certificate as a bytestring"

2433

try:

2434

cert_type = gnutls.certificate_type_get2(session._c_object,

2435

gnutls.CTYPE_PEERS)

2436

except AttributeError:

2437

cert_type = gnutls.certificate_type_get(session._c_object)

2438

if gnutls.has_rawpk:

2439

valid_cert_types = frozenset((gnutls.CRT_RAWPK,))

2440

else:

2441

valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))

2442

# If not a valid certificate type...

2443

if cert_type not in valid_cert_types:

2444

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

2445

valid_cert_types)

2446

# ...return invalid data

2447

return b""

2448

list_size = ctypes.c_uint(1)

2449

cert_list = (gnutls.certificate_get_peers

2450

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

2451

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

2452

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

2453

if list_size.value == 0:

74

__del__ = stop_checker

75

def fileno(self):

76

if self.checker is None:

2454

77

return None

2455

cert = cert_list[0]

2456

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

2457

2458

@staticmethod

2459

def key_id(certificate):

2460

"Convert a certificate bytestring to a hexdigit key ID"

2461

# New GnuTLS "datum" with the public key

2462

datum = gnutls.datum_t(

2463

ctypes.cast(ctypes.c_char_p(certificate),

2464

ctypes.POINTER(ctypes.c_ubyte)),

2465

ctypes.c_uint(len(certificate)))

2466

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

2467

# New empty GnuTLS certificate

2468

pubkey = gnutls.pubkey_t()

2469

gnutls.pubkey_init(ctypes.byref(pubkey))

2470

# Import the raw public key into the certificate

2471

gnutls.pubkey_import(pubkey,

2472

ctypes.byref(datum),

2473

gnutls.X509_FMT_DER)

2474

# New buffer for the key ID

2475

buf = ctypes.create_string_buffer(32)

2476

buf_len = ctypes.c_size_t(len(buf))

2477

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

2478

gnutls.pubkey_get_key_id(

2479

pubkey,

2480

gnutls.KEYID_USE_SHA256,

2481

ctypes.cast(ctypes.byref(buf),

2482

ctypes.POINTER(ctypes.c_ubyte)),

2483

ctypes.byref(buf_len))

2484

# Deinit the certificate

2485

gnutls.pubkey_deinit(pubkey)

2486

2487

# Convert the buffer to a Python bytestring

2488

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

2489

# Convert the bytestring to hexadecimal notation

2490

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

2491

return hex_key_id

2492

2493

@staticmethod

2494

def fingerprint(openpgp):

2495

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2496

# New GnuTLS "datum" with the OpenPGP public key

2497

datum = gnutls.datum_t(

2498

ctypes.cast(ctypes.c_char_p(openpgp),

2499

ctypes.POINTER(ctypes.c_ubyte)),

2500

ctypes.c_uint(len(openpgp)))

2501

# New empty GnuTLS certificate

2502

crt = gnutls.openpgp_crt_t()

2503

gnutls.openpgp_crt_init(ctypes.byref(crt))

2504

# Import the OpenPGP public key into the certificate

2505

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

2506

gnutls.OPENPGP_FMT_RAW)

2507

# Verify the self signature in the key

2508

crtverify = ctypes.c_uint()

2509

gnutls.openpgp_crt_verify_self(crt, 0,

2510

ctypes.byref(crtverify))

2511

if crtverify.value != 0:

2512

gnutls.openpgp_crt_deinit(crt)

2513

raise gnutls.CertificateSecurityError(code

2514

=crtverify.value)

2515

# New buffer for the fingerprint

2516

buf = ctypes.create_string_buffer(20)

2517

buf_len = ctypes.c_size_t()

2518

# Get the fingerprint from the certificate into the buffer

2519

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

2520

ctypes.byref(buf_len))

2521

# Deinit the certificate

2522

gnutls.openpgp_crt_deinit(crt)

2523

# Convert the buffer to a Python bytestring

2524

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

2525

# Convert the bytestring to hexadecimal notation

2526

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

2527

return hex_fpr

2528

2529

2530

class MultiprocessingMixIn:

2531

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

2532

2533

def sub_process_main(self, request, address):

2534

try:

2535

self.finish_request(request, address)

2536

except Exception:

2537

self.handle_error(request, address)

2538

self.close_request(request)

2539

2540

def process_request(self, request, address):

2541

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

2542

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

2543

args=(request, address))

2544

proc.start()

2545

return proc

2546

2547

2548

class MultiprocessingMixInWithPipe(MultiprocessingMixIn):

2549

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

2550

2551

def process_request(self, request, client_address):

2552

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

2553

2554

This function creates a new pipe in self.pipe

2555

"""

2556

parent_pipe, self.child_pipe = multiprocessing.Pipe()

2557

2558

proc = MultiprocessingMixIn.process_request(self, request,

2559

client_address)

2560

self.child_pipe.close()

2561

self.add_pipe(parent_pipe, proc)

2562

2563

def add_pipe(self, parent_pipe, proc):

2564

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

2565

raise NotImplementedError()

2566

2567

2568

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2569

socketserver.TCPServer):

2570

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

2571

2572

Attributes:

2573

enabled: Boolean; whether this server is activated yet

2574

interface: None or a network interface name (string)

2575

use_ipv6: Boolean; to use IPv6 or not

2576

"""

2577

2578

def __init__(self, server_address, RequestHandlerClass,

2579

interface=None,

2580

use_ipv6=True,

2581

socketfd=None):

2582

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

2583

creating a new one with socket.socket().

2584

"""

2585

self.interface = interface

2586

if use_ipv6:

2587

self.address_family = socket.AF_INET6

2588

if socketfd is not None:

2589

# Save the file descriptor

2590

self.socketfd = socketfd

2591

# Save the original socket.socket() function

2592

self.socket_socket = socket.socket

2593

2594

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

2595

#

2596

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

2597

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

2598

# patching socket.socket.)

2599

#

2600

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

2601

@functools.wraps(socket.socket)

2602

def socket_wrapper(*args, **kwargs):

2603

# Restore original function so subsequent calls are

2604

# not affected.

2605

socket.socket = self.socket_socket

2606

del self.socket_socket

2607

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

2608

# saved file descriptor.

2609

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

2610

# Replace socket.socket() function with wrapper

2611

socket.socket = socket_wrapper

2612

# The socketserver.TCPServer.__init__ will call

2613

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

2614

# socket_wrapper(), if socketfd was set.

2615

socketserver.TCPServer.__init__(self, server_address,

2616

RequestHandlerClass)

2617

2618

def server_bind(self):

2619

"""This overrides the normal server_bind() function

2620

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

2621

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

2622

global SO_BINDTODEVICE

2623

if self.interface is not None:

2624

if SO_BINDTODEVICE is None:

2625

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

2626

# common enough.

2627

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

2628

SO_BINDTODEVICE = 25

2629

try:

2630

self.socket.setsockopt(

2631

socket.SOL_SOCKET, SO_BINDTODEVICE,

2632

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

2633

except socket.error as error:

2634

if error.errno == errno.EPERM:

2635

logger.error("No permission to bind to"

2636

" interface %s", self.interface)

2637

elif error.errno == errno.ENOPROTOOPT:

2638

logger.error("SO_BINDTODEVICE not available;"

2639

" cannot bind to interface %s",

2640

self.interface)

2641

elif error.errno == errno.ENODEV:

2642

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

2643

" cannot bind", self.interface)

2644

else:

2645

raise

2646

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

2647

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

2648

if self.server_address[1]:

2649

self.allow_reuse_address = True

2650

if not self.server_address[0]:

2651

if self.address_family == socket.AF_INET6:

2652

any_address = "::" # in6addr_any

2653

else:

2654

any_address = "0.0.0.0" # INADDR_ANY

2655

self.server_address = (any_address,

2656

self.server_address[1])

2657

elif not self.server_address[1]:

2658

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

2659

# if self.interface:

2660

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

2661

# 0, # port

2662

# 0, # flowinfo

2663

# if_nametoindex

2664

# (self.interface))

2665

return socketserver.TCPServer.server_bind(self)

2666

2667

2668

class MandosServer(IPv6_TCPServer):

2669

"""Mandos server.

2670

2671

Attributes:

2672

clients: set of Client objects

2673

gnutls_priority GnuTLS priority string

2674

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

2675

2676

Assumes a GLib.MainLoop event loop.

2677

"""

2678

2679

def __init__(self, server_address, RequestHandlerClass,

2680

interface=None,

2681

use_ipv6=True,

2682

clients=None,

2683

gnutls_priority=None,

2684

use_dbus=True,

2685

socketfd=None):

2686

self.enabled = False

2687

self.clients = clients

2688

if self.clients is None:

2689

self.clients = {}

2690

self.use_dbus = use_dbus

2691

self.gnutls_priority = gnutls_priority

2692

IPv6_TCPServer.__init__(self, server_address,

2693

RequestHandlerClass,

2694

interface=interface,

2695

use_ipv6=use_ipv6,

2696

socketfd=socketfd)

2697

2698

def server_activate(self):

2699

if self.enabled:

2700

return socketserver.TCPServer.server_activate(self)

2701

2702

def enable(self):

2703

self.enabled = True

2704

2705

def add_pipe(self, parent_pipe, proc):

2706

# Call "handle_ipc" for both data and EOF events

2707

GLib.io_add_watch(

2708

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

2709

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

2710

functools.partial(self.handle_ipc,

2711

parent_pipe=parent_pipe,

2712

proc=proc))

2713

2714

def handle_ipc(self, source, condition,

2715

parent_pipe=None,

2716

proc=None,

2717

client_object=None):

2718

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

2719

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

2720

# Wait for other process to exit

2721

proc.join()

2722

return False

2723

2724

# Read a request from the child

2725

request = parent_pipe.recv()

2726

command = request[0]

2727

2728

if command == 'init':

2729

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

2730

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

2731

address = request[3]

2732

2733

for c in self.clients.values():

2734

if key_id == ("E3B0C44298FC1C149AFBF4C8996FB924"

2735

"27AE41E4649B934CA495991B7852B855"):

2736

continue

2737

if key_id and c.key_id == key_id:

2738

client = c

2739

break

2740

if fpr and c.fingerprint == fpr:

2741

client = c

2742

break

2743

else:

2744

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

2745

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

2746

if self.use_dbus:

2747

# Emit D-Bus signal

2748

mandos_dbus_service.ClientNotFound(key_id or fpr,

2749

address[0])

2750

parent_pipe.send(False)

2751

return False

2752

2753

GLib.io_add_watch(

2754

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

2755

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

2756

functools.partial(self.handle_ipc,

2757

parent_pipe=parent_pipe,

2758

proc=proc,

2759

client_object=client))

2760

parent_pipe.send(True)

2761

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

2762

# same fileno

2763

return False

2764

if command == 'funcall':

2765

funcname = request[1]

2766

args = request[2]

2767

kwargs = request[3]

2768

2769

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

2770

funcname)(*args,

2771

**kwargs)))

2772

2773

if command == 'getattr':

2774

attrname = request[1]

2775

if isinstance(client_object.__getattribute__(attrname),

2776

collections.abc.Callable):

2777

parent_pipe.send(('function', ))

2778

else:

2779

parent_pipe.send((

2780

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

2781

2782

if command == 'setattr':

2783

attrname = request[1]

2784

value = request[2]

2785

setattr(client_object, attrname, value)

2786

2787

return True

2788

2789

2790

def rfc3339_duration_to_delta(duration):

2791

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

2792

2793

>>> timedelta = datetime.timedelta

2794

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

2795

True

2796

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

2797

True

2798

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

2799

True

2800

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

2801

True

2802

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

2803

True

2804

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

2805

True

2806

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

2807

True

2808

>>> del timedelta

2809

"""

2810

2811

# Parsing an RFC 3339 duration with regular expressions is not

2812

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

2813

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

2814

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

2815

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

2816

# avoid excessive use of external libraries.

2817

2818

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

2819

Token = collections.namedtuple("Token", (

2820

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

2821

# a "group" containing digits

2822

"value", # datetime.timedelta or None

2823

"followers")) # Tokens valid after this token

2824

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

2825

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

2826

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

2827

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

2828

datetime.timedelta(seconds=1),

2829

frozenset((token_end, )))

2830

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

2831

datetime.timedelta(minutes=1),

2832

frozenset((token_second, token_end)))

2833

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

2834

datetime.timedelta(hours=1),

2835

frozenset((token_minute, token_end)))

2836

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

2837

None,

2838

frozenset((token_hour, token_minute,

2839

token_second)))

2840

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

2841

datetime.timedelta(days=1),

2842

frozenset((token_time, token_end)))

2843

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

2844

datetime.timedelta(weeks=4),

2845

frozenset((token_day, token_end)))

2846

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

2847

datetime.timedelta(weeks=52),

2848

frozenset((token_month, token_end)))

2849

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

2850

datetime.timedelta(weeks=1),

2851

frozenset((token_end, )))

2852

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

2853

frozenset((token_year, token_month,

2854

token_day, token_time,

2855

token_week)))

2856

# Define starting values:

2857

# Value so far

2858

value = datetime.timedelta()

2859

found_token = None

2860

# Following valid tokens

2861

followers = frozenset((token_duration, ))

2862

# String left to parse

2863

s = duration

2864

# Loop until end token is found

2865

while found_token is not token_end:

2866

# Search for any currently valid tokens

2867

for token in followers:

2868

match = token.regexp.match(s)

2869

if match is not None:

2870

# Token found

2871

if token.value is not None:

2872

# Value found, parse digits

2873

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

2874

# Add to value so far

2875

value += factor * token.value

2876

# Strip token from string

2877

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

2878

# Go to found token

2879

found_token = token

2880

# Set valid next tokens

2881

followers = found_token.followers

2882

break

2883

else:

2884

# No currently valid tokens were found

2885

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

2886

.format(duration))

2887

# End token found

2888

return value

2889

78

return self.checker.stdout.fileno()

79

def next_stop(self):

80

"""The time when something must be done about this client"""

81

return min(self.last_seen + self.timeout, self.next_check)

82

def still_valid(self, now=None):

83

"""Has this client's timeout not passed?"""

84

if now is None:

85

now = datetime.datetime.now()

86

return now < (self.last_seen + timeout)

87

def it_is_time_to_check(self, now=None):

88

if now is None:

89

now = datetime.datetime.now()

90

return self.next_check <= now

91

92

93

class server_metaclass(type):

94

"Common behavior for the UDP and TCP server classes"

95

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

96

attrs["address_family"] = socket.AF_INET6

97

attrs["allow_reuse_address"] = True

98

def server_bind(self):

99

if self.options.interface:

100

if not hasattr(socket, "SO_BINDTODEVICE"):

101

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

102

socket.SO_BINDTODEVICE = 25

103

try:

104

self.socket.setsockopt(socket.SOL_SOCKET,

105

socket.SO_BINDTODEVICE,

106

self.options.interface)

107

except socket.error, error:

108

if error[0] == errno.EPERM:

109

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

110

self.options.interface

111

else:

112

raise error

113

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

114

attrs["server_bind"] = server_bind

115

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

116

if "options" in kwargs:

117

self.options = kwargs["options"]

118

del kwargs["options"]

119

if "clients" in kwargs:

120

self.clients = kwargs["clients"]

121

del kwargs["clients"]

122

if "credentials" in kwargs:

123

self.credentials = kwargs["credentials"]

124

del kwargs["credentials"]

125

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

126

attrs["__init__"] = init

127

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

128

129

130

class udp_handler(SocketServer.DatagramRequestHandler, object):

131

def handle(self):

132

self.wfile.write("Polo")

133

print "UDP request answered"

134

135

136

class IPv6_UDPServer(SocketServer.UDPServer, object):

137

__metaclass__ = server_metaclass

138

def verify_request(self, request, client_address):

139

print "UDP request came"

140

return request[0] == "Marco"

141

142

143

class tcp_handler(SocketServer.BaseRequestHandler, object):

144

def handle(self):

145

print "TCP request came"

146

print "Request:", self.request

147

print "Client Address:", self.client_address

148

print "Server:", self.server

149

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

150

self.server.credentials)

151

session.handshake()

152

if session.peer_certificate:

153

print "DN:", session.peer_certificate.subject

154

try:

155

session.verify_peer()

156

except gnutls.errors.CertificateError, error:

157

print "Verify failed", error

158

session.bye()

159

return

160

try:

161

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

162

for client in self.server.clients)

163

[session.peer_certificate.subject])

164

except KeyError:

165

session.send("gazonk")

166

# Log maybe? XXX

167

session.bye()

168

169

170

class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):

171

__metaclass__ = server_metaclass

172

request_queue_size = 1024

173

174

175

in6addr_any = "::"

2890

176

2891

177

def string_to_delta(interval):

2892

178

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

2893

179

2894

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

2895

True

2896

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

2897

True

2898

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

2899

True

2900

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

2901

True

2902

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

2903

True

2904

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

2905

True

180

>>> string_to_delta('7d')

181

datetime.timedelta(7)

182

>>> string_to_delta('60s')

183

datetime.timedelta(0, 60)

184

>>> string_to_delta('60m')

185

datetime.timedelta(0, 3600)

186

>>> string_to_delta('24h')

187

datetime.timedelta(1)

188

>>> string_to_delta(u'1w')

189

datetime.timedelta(7)

2906

190

"""

2907

2908

191

try:

2909

return rfc3339_duration_to_delta(interval)

2910

except ValueError:

2911

pass

2912

2913

timevalue = datetime.timedelta(0)

2914

for s in interval.split():

2915

try:

2916

suffix = s[-1]

2917

value = int(s[:-1])

2918

if suffix == "d":

2919

delta = datetime.timedelta(value)

2920

elif suffix == "s":

2921

delta = datetime.timedelta(0, value)

2922

elif suffix == "m":

2923

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

2924

elif suffix == "h":

2925

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

2926

elif suffix == "w":

2927

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

2928

else:

2929

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

2930

except IndexError as e:

2931

raise ValueError(*(e.args))

2932

timevalue += delta

2933

return timevalue

2934

2935

2936

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

2937

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

2938

2939

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

2940

if os.fork():

2941

sys.exit()

2942

os.setsid()

2943

if not nochdir:

2944

os.chdir("/")

2945

if os.fork():

2946

sys.exit()

2947

if not noclose:

2948

# Close all standard open file descriptors

2949

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

2950

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

2951

raise OSError(errno.ENODEV,

2952

"{} not a character device"

2953

.format(os.devnull))

2954

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

2955

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

2956

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

2957

if null > 2:

2958

os.close(null)

192

suffix=unicode(interval[-1])

193

value=int(interval[:-1])

194

if suffix == u"d":

195

delta = datetime.timedelta(value)

196

elif suffix == u"s":

197

delta = datetime.timedelta(0, value)

198

elif suffix == u"m":

199

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

200

elif suffix == u"h":

201

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

202

elif suffix == u"w":

203

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

204

else:

205

raise ValueError

206

except (ValueError, IndexError):

207

raise ValueError

208

return delta

2959

209

2960

210

2961

211

def main():

2962

2963

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

2964

# Parsing of options, both command line and config file

2965

2966

parser = argparse.ArgumentParser()

2967

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

2968

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

2969

help="show version number and exit")

2970

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

2971

help="Bind to interface IF")

2972

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

2973

help="Address to listen for requests on")

2974

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

2975

help="Port number to receive requests on")

2976

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

2977

help="Run self-test")

2978

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

2979

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

2980

" to terminal", default=None)

2981

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

2982

help="Debug level for stdout output")

2983

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

2984

" priority string (see GnuTLS documentation)")

2985

parser.add_argument("--servicename",

2986

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

2987

parser.add_argument("--configdir",

2988

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

2989

help="Directory to search for configuration"

2990

" files")

2991

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

2992

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

2993

" system bus interface", default=None)

2994

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

2995

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

2996

default=None)

2997

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

2998

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

2999

" state", default=None)

3000

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

3001

help="Specify a file descriptor to a network"

3002

" socket to use instead of creating one")

3003

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

3004

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

3005

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

3006

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

3007

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

3008

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

3009

default=None)

3010

3011

options = parser.parse_args()

3012

3013

# Default values for config file for server-global settings

3014

if gnutls.has_rawpk:

3015

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

3016

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

3017

else:

3018

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

3019

":+SIGN-DSA-SHA256")

3020

server_defaults = {"interface": "",

3021

"address": "",

3022

"port": "",

3023

"debug": "False",

3024

"priority": priority,

3025

"servicename": "Mandos",

3026

"use_dbus": "True",

3027

"use_ipv6": "True",

3028

"debuglevel": "",

3029

"restore": "True",

3030

"socket": "",

3031

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

3032

"foreground": "False",

3033

"zeroconf": "True",

3034

}

3035

del priority

3036

3037

# Parse config file for server-global settings

3038

server_config = configparser.ConfigParser(server_defaults)

3039

del server_defaults

3040

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

3041

# Convert the ConfigParser object to a dict

3042

server_settings = server_config.defaults()

3043

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

3044

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

3045

"foreground", "zeroconf"):

3046

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

3047

option)

3048

if server_settings["port"]:

3049

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

3050

"port")

3051

if server_settings["socket"]:

3052

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

3053

"socket")

3054

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

3055

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

3056

# happen with a supplied network socket.

3057

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

3058

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

3059

["socket"])

3060

del server_config

3061

3062

# Override the settings from the config file with command line

3063

# options, if set.

3064

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

3065

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

3066

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

3067

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

3068

value = getattr(options, option)

3069

if value is not None:

3070

server_settings[option] = value

3071

del options

3072

# Force all strings to be unicode

3073

for option in server_settings.keys():

3074

if isinstance(server_settings[option], bytes):

3075

server_settings[option] = (server_settings[option]

3076

.decode("utf-8"))

3077

# Force all boolean options to be boolean

3078

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

3079

"foreground", "zeroconf"):

3080

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

3081

# Debug implies foreground

3082

if server_settings["debug"]:

3083

server_settings["foreground"] = True

3084

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

3085

3086

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

3087

3088

if (not server_settings["zeroconf"]

3089

and not (server_settings["port"]

3090

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

3091

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

3092

3093

# For convenience

3094

debug = server_settings["debug"]

3095

debuglevel = server_settings["debuglevel"]

3096

use_dbus = server_settings["use_dbus"]

3097

use_ipv6 = server_settings["use_ipv6"]

3098

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

3099

stored_state_file)

3100

foreground = server_settings["foreground"]

3101

zeroconf = server_settings["zeroconf"]

3102

3103

if debug:

3104

initlogger(debug, logging.DEBUG)

3105

else:

3106

if not debuglevel:

3107

initlogger(debug)

3108

else:

3109

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

3110

initlogger(debug, level)

3111

3112

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

3113

syslogger.setFormatter(

3114

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

3115

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

3116

server_settings["servicename"])))

3117

3118

# Parse config file with clients

3119

client_config = configparser.ConfigParser(Client.client_defaults)

3120

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

3121

"clients.conf"))

3122

3123

global mandos_dbus_service

3124

mandos_dbus_service = None

3125

3126

socketfd = None

3127

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

3128

socketfd = server_settings["socket"]

3129

tcp_server = MandosServer(

3130

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

3131

ClientHandler,

3132

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

3133

use_ipv6=use_ipv6,

3134

gnutls_priority=server_settings["priority"],

3135

use_dbus=use_dbus,

3136

socketfd=socketfd)

3137

if not foreground:

3138

pidfilename = "/run/mandos.pid"

3139

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

3140

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

3141

pidfile = None

3142

try:

3143

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

3144

except IOError as e:

3145

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

3146

exc_info=e)

3147

3148

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

3149

("mandos", "mandos"),

3150

("nobody", "nogroup")):

3151

try:

3152

uid = pwd.getpwnam(name).pw_uid

3153

gid = pwd.getpwnam(group).pw_gid

212

parser = OptionParser()

213

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

214

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

215

help="Interface to bind to")

216

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

217

metavar="FILE",

218

help="Public key certificate to use")

219

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

220

metavar="FILE",

221

help="Private key to use")

222

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

223

metavar="FILE",

224

help="Certificate Authority certificate to use")

225

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

226

metavar="FILE",

227

help="Certificate Revokation List to use")

228

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

229

help="Port number to receive requests on")

230

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

231

help="DH group to use")

232

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

233

default="15m",

234

help="Amount of downtime allowed for clients")

235

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

236

default="5m",

237

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

238

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

239

help="Run self-test")

240

(options, args) = parser.parse_args()

241

242

if options.check:

243

import doctest

244

doctest.testmod()

245

sys.exit()

246

247

# Parse the time arguments

248

try:

249

options.timeout = string_to_delta(options.timeout)

250

except ValueError:

251

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

252

253

try:

254

options.interval = string_to_delta(options.interval)

255

except ValueError:

256

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

257

258

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

259

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

260

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

261

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

262

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

263

264

# Parse config file

265

defaults = {}

266

client_config_object = ConfigParser.SafeConfigParser(defaults)

267

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

268

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

269

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

270

for section in client_config_object.sections()]

271

272

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

273

udp_handler,

274

options=options)

275

276

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

277

tcp_handler,

278

options=options,

279

clients=clients,

280

credentials=cred)

281

282

while True:

283

try:

284

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

285

tcp_server), (), ())

286

if not input:

287

pass

288

else:

289

for obj in input:

290

obj.handle_request()

291

except KeyboardInterrupt:

3154

292

break

3155

except KeyError:

3156

continue

3157

else:

3158

uid = 65534

3159

gid = 65534

3160

try:

3161

os.setgid(gid)

3162

os.setuid(uid)

3163

if debug:

3164

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

3165

gid))

3166

except OSError as error:

3167

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

3168

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

3169

if error.errno != errno.EPERM:

3170

raise

3171

3172

if debug:

3173

# Enable all possible GnuTLS debugging

3174

3175

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

3176

# - GnuTLS manual

3177

gnutls.global_set_log_level(11)

3178

3179

@gnutls.log_func

3180

def debug_gnutls(level, string):

3181

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

3182

3183

gnutls.global_set_log_function(debug_gnutls)

3184

3185

# Redirect stdin so all checkers get /dev/null

3186

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

3187

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

3188

if null > 2:

3189

os.close(null)

3190

3191

# Need to fork before connecting to D-Bus

3192

if not foreground:

3193

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

3194

daemon()

3195

3196

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

3197

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

3198

# need to inform GLib that threads will be used.

3199

GLib.threads_init()

3200

3201

global main_loop

3202

# From the Avahi example code

3203

DBusGMainLoop(set_as_default=True)

3204

main_loop = GLib.MainLoop()

3205

bus = dbus.SystemBus()

3206

# End of Avahi example code

3207

if use_dbus:

3208

try:

3209

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

3210

bus,

3211

do_not_queue=True)

3212

old_bus_name = dbus.service.BusName(

3213

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

3214

do_not_queue=True)

3215

except dbus.exceptions.DBusException as e:

3216

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

3217

use_dbus = False

3218

server_settings["use_dbus"] = False

3219

tcp_server.use_dbus = False

3220

if zeroconf:

3221

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

3222

service = AvahiServiceToSyslog(

3223

name=server_settings["servicename"],

3224

servicetype="_mandos._tcp",

3225

protocol=protocol,

3226

bus=bus)

3227

if server_settings["interface"]:

3228

service.interface = if_nametoindex(

3229

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

3230

3231

global multiprocessing_manager

3232

multiprocessing_manager = multiprocessing.Manager()

3233

3234

client_class = Client

3235

if use_dbus:

3236

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

3237

3238

client_settings = Client.config_parser(client_config)

3239

old_client_settings = {}

3240

clients_data = {}

3241

3242

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

3243

global wnull

3244

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

3245

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

3246

# mode

3247

if debug or not foreground:

3248

wnull.close()

3249

3250

# Get client data and settings from last running state.

3251

if server_settings["restore"]:

3252

try:

3253

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

3254

if sys.version_info.major == 2:

3255

clients_data, old_client_settings = pickle.load(

3256

stored_state)

3257

else:

3258

bytes_clients_data, bytes_old_client_settings = (

3259

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

3260

# Fix bytes to strings

3261

# clients_data

3262

# .keys()

3263

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

3264

if isinstance(key, bytes)

3265

else key): value

3266

for key, value in

3267

bytes_clients_data.items()}

3268

del bytes_clients_data

3269

for key in clients_data:

3270

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

3271

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

3272

for k, v in

3273

clients_data[key].items()}

3274

clients_data[key] = value

3275

# .client_structure

3276

value["client_structure"] = [

3277

(s.decode("utf-8")

3278

if isinstance(s, bytes)

3279

else s) for s in

3280

value["client_structure"]]

3281

# .name, .host, and .checker_command

3282

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

3283

if isinstance(value[k], bytes):

3284

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

3285

if "key_id" not in value:

3286

value["key_id"] = ""

3287

elif "fingerprint" not in value:

3288

value["fingerprint"] = ""

3289

# old_client_settings

3290

# .keys()

3291

old_client_settings = {

3292

(key.decode("utf-8")

3293

if isinstance(key, bytes)

3294

else key): value

3295

for key, value in

3296

bytes_old_client_settings.items()}

3297

del bytes_old_client_settings

3298

# .host and .checker_command

3299

for value in old_client_settings.values():

3300

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

3301

if isinstance(value[attribute], bytes):

3302

value[attribute] = (value[attribute]

3303

.decode("utf-8"))

3304

os.remove(stored_state_path)

3305

except IOError as e:

3306

if e.errno == errno.ENOENT:

3307

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

3308

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

3309

else:

3310

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

3311

exc_info=e)

3312

raise

3313

except EOFError as e:

3314

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

3315

"EOFError:",

3316

exc_info=e)

3317

3318

with PGPEngine() as pgp:

3319

for client_name, client in clients_data.items():

3320

# Skip removed clients

3321

if client_name not in client_settings:

3322

continue

3323

3324

# Decide which value to use after restoring saved state.

3325

# We have three different values: Old config file,

3326

# new config file, and saved state.

3327

# New config value takes precedence if it differs from old

3328

# config value, otherwise use saved state.

3329

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

3330

try:

3331

# For each value in new config, check if it

3332

# differs from the old config value (Except for

3333

# the "secret" attribute)

3334

if (name != "secret"

3335

and (value !=

3336

old_client_settings[client_name][name])):

3337

client[name] = value

3338

except KeyError:

3339

pass

3340

3341

# Clients who has passed its expire date can still be

3342

# enabled if its last checker was successful. A Client

3343

# whose checker succeeded before we stored its state is

3344

# assumed to have successfully run all checkers during

3345

# downtime.

3346

if client["enabled"]:

3347

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

3348

if not client["last_checked_ok"]:

3349

logger.warning(

3350

"disabling client {} - Client never "

3351

"performed a successful checker".format(

3352

client_name))

3353

client["enabled"] = False

3354

elif client["last_checker_status"] != 0:

3355

logger.warning(

3356

"disabling client {} - Client last"

3357

" checker failed with error code"

3358

" {}".format(

3359

client_name,

3360

client["last_checker_status"]))

3361

client["enabled"] = False

3362

else:

3363

client["expires"] = (

3364

datetime.datetime.utcnow()

3365

+ client["timeout"])

3366

logger.debug("Last checker succeeded,"

3367

" keeping {} enabled".format(

3368

client_name))

3369

try:

3370

client["secret"] = pgp.decrypt(

3371

client["encrypted_secret"],

3372

client_settings[client_name]["secret"])

3373

except PGPError:

3374

# If decryption fails, we use secret from new settings

3375

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

3376

client_name))

3377

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

3378

["secret"])

3379

3380

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

3381

for client_name in (set(old_client_settings)

3382

- set(client_settings)):

3383

del clients_data[client_name]

3384

for client_name in (set(client_settings)

3385

- set(old_client_settings)):

3386

clients_data[client_name] = client_settings[client_name]

3387

3388

# Create all client objects

3389

for client_name, client in clients_data.items():

3390

tcp_server.clients[client_name] = client_class(

3391

name=client_name,

3392

settings=client,

3393

server_settings=server_settings)

3394

3395

if not tcp_server.clients:

3396

logger.warning("No clients defined")

3397

3398

if not foreground:

3399

if pidfile is not None:

3400

pid = os.getpid()

3401

try:

3402

with pidfile:

3403

print(pid, file=pidfile)

3404

except IOError:

3405

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

3406

pidfilename, pid)

3407

del pidfile

3408

del pidfilename

3409

3410

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

3411

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3412

lambda: main_loop.quit() and False)

3413

3414

if use_dbus:

3415

3416

@alternate_dbus_interfaces(

3417

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

3418

class MandosDBusService(DBusObjectWithObjectManager):

3419

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

3420

3421

def __init__(self):

3422

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

3423

3424

_interface = "se.recompile.Mandos"

3425

3426

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

3427

def ClientAdded(self, objpath):

3428

"D-Bus signal"

3429

pass

3430

3431

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

3432

def ClientNotFound(self, key_id, address):

3433

"D-Bus signal"

3434

pass

3435

3436

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

3437

"true"})

3438

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

3439

def ClientRemoved(self, objpath, name):

3440

"D-Bus signal"

3441

pass

3442

3443

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

3444

"true"})

3445

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

3446

def GetAllClients(self):

3447

"D-Bus method"

3448

return dbus.Array(c.dbus_object_path for c in

3449

tcp_server.clients.values())

3450

3451

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

3452

"true"})

3453

@dbus.service.method(_interface,

3454

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

3455

def GetAllClientsWithProperties(self):

3456

"D-Bus method"

3457

return dbus.Dictionary(

3458

{c.dbus_object_path: c.GetAll(

3459

"se.recompile.Mandos.Client")

3460

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

3461

signature="oa{sv}")

3462

3463

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

3464

def RemoveClient(self, object_path):

3465

"D-Bus method"

3466

for c in tcp_server.clients.values():

3467

if c.dbus_object_path == object_path:

3468

del tcp_server.clients[c.name]

3469

c.remove_from_connection()

3470

# Don't signal the disabling

3471

c.disable(quiet=True)

3472

# Emit D-Bus signal for removal

3473

self.client_removed_signal(c)

3474

return

3475

raise KeyError(object_path)

3476

3477

del _interface

3478

3479

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3480

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

3481

def GetManagedObjects(self):

3482

"""D-Bus method"""

3483

return dbus.Dictionary(

3484

{client.dbus_object_path:

3485

dbus.Dictionary(

3486

{interface: client.GetAll(interface)

3487

for interface in

3488

client._get_all_interface_names()})

3489

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

3490

3491

def client_added_signal(self, client):

3492

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

3493

if use_dbus:

3494

# New standard signal

3495

self.InterfacesAdded(

3496

client.dbus_object_path,

3497

dbus.Dictionary(

3498

{interface: client.GetAll(interface)

3499

for interface in

3500

client._get_all_interface_names()}))

3501

# Old signal

3502

self.ClientAdded(client.dbus_object_path)

3503

3504

def client_removed_signal(self, client):

3505

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

3506

if use_dbus:

3507

# New standard signal

3508

self.InterfacesRemoved(

3509

client.dbus_object_path,

3510

client._get_all_interface_names())

3511

# Old signal

3512

self.ClientRemoved(client.dbus_object_path,

3513

client.name)

3514

3515

mandos_dbus_service = MandosDBusService()

3516

3517

# Save modules to variables to exempt the modules from being

3518

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

3519

mp = multiprocessing

3520

wn = wnull

3521

3522

def cleanup():

3523

"Cleanup function; run on exit"

3524

if zeroconf:

3525

service.cleanup()

3526

3527

mp.active_children()

3528

wn.close()

3529

if not (tcp_server.clients or client_settings):

3530

return

3531

3532

# Store client before exiting. Secrets are encrypted with key

3533

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

3534

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

3535

clients = {}

3536

with PGPEngine() as pgp:

3537

for client in tcp_server.clients.values():

3538

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

3539

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

3540

key)

3541

client_dict = {}

3542

3543

# A list of attributes that can not be pickled

3544

# + secret.

3545

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

3546

"checker", "server_settings"}

3547

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

3548

.Object):

3549

exclude.add(name)

3550

3551

client_dict["encrypted_secret"] = (client

3552

.encrypted_secret)

3553

for attr in client.client_structure:

3554

if attr not in exclude:

3555

client_dict[attr] = getattr(client, attr)

3556

3557

clients[client.name] = client_dict

3558

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

3559

3560

try:

3561

with tempfile.NamedTemporaryFile(

3562

mode='wb',

3563

suffix=".pickle",

3564

prefix='clients-',

3565

dir=os.path.dirname(stored_state_path),

3566

delete=False) as stored_state:

3567

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

3568

protocol=2)

3569

tempname = stored_state.name

3570

os.rename(tempname, stored_state_path)

3571

except (IOError, OSError) as e:

3572

if not debug:

3573

try:

3574

os.remove(tempname)

3575

except NameError:

3576

pass

3577

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

3578

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

3579

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

3580

else:

3581

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

3582

exc_info=e)

3583

raise

3584

3585

# Delete all clients, and settings from config

3586

while tcp_server.clients:

3587

name, client = tcp_server.clients.popitem()

3588

if use_dbus:

3589

client.remove_from_connection()

3590

# Don't signal the disabling

3591

client.disable(quiet=True)

3592

# Emit D-Bus signal for removal

3593

if use_dbus:

3594

mandos_dbus_service.client_removed_signal(client)

3595

client_settings.clear()

3596

3597

atexit.register(cleanup)

3598

3599

for client in tcp_server.clients.values():

3600

if use_dbus:

3601

# Emit D-Bus signal for adding

3602

mandos_dbus_service.client_added_signal(client)

3603

# Need to initiate checking of clients

3604

if client.enabled:

3605

client.init_checker()

3606

3607

tcp_server.enable()

3608

tcp_server.server_activate()

3609

3610

# Find out what port we got

3611

if zeroconf:

3612

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

3613

if use_ipv6:

3614

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

3615

" flowinfo %d, scope_id %d",

3616

*tcp_server.socket.getsockname())

3617

else: # IPv4

3618

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

3619

*tcp_server.socket.getsockname())

3620

3621

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

3622

3623

try:

3624

if zeroconf:

3625

# From the Avahi example code

3626

try:

3627

service.activate()

3628

except dbus.exceptions.DBusException as error:

3629

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

3630

cleanup()

3631

sys.exit(1)

3632

# End of Avahi example code

3633

3634

GLib.io_add_watch(

3635

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

3636

GLib.PRIORITY_DEFAULT, GLib.IO_IN,

3637

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

3638

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

3639

3640

logger.debug("Starting main loop")

3641

main_loop.run()

3642

except AvahiError as error:

3643

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

3644

cleanup()

3645

sys.exit(1)

3646

except KeyboardInterrupt:

3647

if debug:

3648

print("", file=sys.stderr)

3649

logger.debug("Server received KeyboardInterrupt")

3650

logger.debug("Server exiting")

3651

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

3652

cleanup()

3653

3654

3655

def should_only_run_tests():

3656

parser = argparse.ArgumentParser(add_help=False)

3657

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

3658

args, unknown_args = parser.parse_known_args()

3659

run_tests = args.check

3660

if run_tests:

3661

# Remove --check argument from sys.argv

3662

sys.argv[1:] = unknown_args

3663

return run_tests

3664

3665

# Add all tests from doctest strings

3666

def load_tests(loader, tests, none):

3667

import doctest

3668

tests.addTests(doctest.DocTestSuite())

3669

return tests

3670

3671

if __name__ == '__main__':

3672

try:

3673

if should_only_run_tests():

3674

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

3675

unittest.main()

3676

else:

3677

main()

3678

finally:

3679

logging.shutdown()

293

294

# Cleanup here

295

for client in clients:

296

client.stop_checker()

297

298

299

if __name__ == "__main__":

300

main()

301